Assembly method for roller device of seamless steel tube cold-rolling mill

Abstract

The invention discloses an assembling method for a roller device of a seamless steel tube cold-rolling mill. The assembling method comprises the following steps that S1, assembling preparation is conducted; s2, assembling an annular hole pattern; s3, mounting a right side bearing seat; s4, adjusting the assembling precision of the right side bearing; s5, mounting a left side bearing seat; s6, adjusting the assembling precision of the left side bearing; s7, a gear is installed; and S8, inspecting and warehousing. The assembly precision and the service life of the roller device are effectively guaranteed, and the technical requirements of high-strength steel seamless steel tube cold rolling production are met.

Description

Technical Field

[0001] The invention relates to a cold rolling production technology for producing seamless steel pipes in metallurgy and machinery industries, and more specifically to an assembly method for a roller device of a cold rolling mill for seamless steel pipes. Background Art

[0002] Seamless steel pipe is a common metallurgical metal product. The cold rolling technology of seamless steel pipe has become the main method of production and processing of seamless steel pipe due to its high rolling precision, fast speed, large production capacity, high yield rate, easy production organization and process technology adjustment.

[0003] Cold rolling production equipment for seamless steel pipes is divided into two-roller type and multi-roller type according to the number of rolls. The two-roller periodic cold rolling mill is the most widely used cold rolling mill for seamless steel pipes due to its compact structure, large rolling force and high production capacity. The two-roller periodic cold rolling mill is mainly composed of a rolling mechanism, a feed rotary mechanism, a transmission mechanism, a mandrel chuck mechanism, a bed support mechanism, a feeding and blanking mechanism, a hydraulic system, a process lubrication system, an electrical automation control system, a pneumatic system and auxiliary mechanisms. The function of the rolling mechanism is to perform cold deformation processing on the blank pipe at room temperature through a deformation tool composed of a plug (together with a mandrel) and a hole type.

[0004] The rolling mechanism consists of a roller device, a machine base, a working frame, a slide device, a transmission rack device and other components. The machine base is placed on a concrete foundation, and the working frame is centrally installed vertically inside the machine base. A slide device is set between the working frame and the machine base to play a supporting, guiding and protective role, and is connected to the transmission mechanism through a horizontal connecting rod; the roller device is divided into two relatively independent roller groups, the upper roller and the lower roller. Figure 1 and Figure 2 As shown, it is composed of roller shaft 1, rolling bearing 2, square bearing seat 3, cylindrical gear 4 (end gear), distance ring 5, isolation ring 6, flat key 7, end cover 8, transparent cover 9, positioning key 10, ring hole type 11, fastener 12, seal 13 and other parts, which are installed in pairs in the working frame, relying on the cylindrical gear at the outer end of the roller shaft to mesh with the transmission rack installed on both sides of the machine base to achieve the function of transmitting power and driving the synchronous rotation of the roller. According to the outer diameter size of the finished seamless steel pipe, the function of rolling a variety of finished product specifications by replacing the ring hole type and transmission gear on the roller device can be realized by one rolling mill.

[0005] During seamless steel pipe rolling, the main motor drives the main transmission mechanism to transmit and output power through the rotation of the main clutch. Under the action of the horizontal connecting rod, the working stand makes a reciprocating horizontal movement in the housing driven by the transmission mechanism. At this time, the rolling mill device installed inside the working stand relies on the meshing action between the cylindrical gears at the outer ends of the rolling mill roller shafts and the transmission rack of the housing to convert the horizontal reciprocating movement of the working stand into the synchronous rotational movement of the rolling mill device (the opposite rotational movement of the upper and lower rolling mills). Through the annular hole-shaped rolling grooves that gradually decrease from large to small in the middle of the rolling mill roller shafts, the tube blank is subjected to extrusion deformation processing, thereby realizing the cold rolling deformation processing of seamless steel pipes under normal temperature conditions. Therefore, for the rolling mechanism and even the entire cold rolling mill, the rolling mill device is the most important component and also the component with the highest frequency of daily use and replacement. On the one hand, during the use of the rolling mill device, fatigue wear phenomena will occur in related components, especially the moving parts such as rolling bearings and transmission gears have a large amount of wear, resulting in an increase in the movement gap. On the other hand, the rolling grooves of the annular hole-shaped, which are the main deformation tools, will also cause diameter expansion wear due to wear. At the same time, faults of the rolling mill device caused by reasons such as the equipment itself and the rolling process are common, such as the cracking of rolling bearings, the rupture of the annular hole-shaped, the bending or fracture of the rolling mill roller shafts, and the breakage of transmission gears.

[0006] After the above-mentioned equipment faults occur, it is necessary to carry out the replacement operation of the rolling mill device. At the same time, due to factors such as service life, irreparable damage of components, and rolling specification adjustment, the rolling mill device needs to be frequently assembled and processed offline with new products. Since a type of cold rolling mill needs to roll seamless steel pipes of multiple specifications, from the perspective of reducing production costs, it is impossible to prepare corresponding rolling mill devices for each specification. Usually, the maximum number of rolling mills prepared for a cold rolling mill does not exceed 4 - 6 sets and does not exceed three specifications. By replacing the annular hole-shaped and transmission gears as needed in a timely manner, the requirements for rolling multiple specifications are met. Therefore, the offline assembly and processing of the rolling mill device is the most common operation process in the operation and maintenance of seamless steel pipe cold rolling production, and the operation frequency ranks first among the entire cold rolling equipment maintenance operation processes.

[0007] In recent years, with the industrialized production and development of high-end seamless steel pipes represented by nickel-based alloys, duplex stainless steels, and super austenitic steels, the rolling forces and impact loads borne by the roll device during rolling deformation processing have become increasingly stronger. The service life of the roll device has decreased significantly compared to that of commonly used ordinary steel types. The workload of disassembly, disassembly, repair processing, and new product assembly processing after the roll device is taken offline and removed from the machine has been increasing day by day. At the same time, new requirements have been put forward in terms of assembly accuracy quality, operator organization, and component guarantee. In particular, the accuracy of the working clearance (movement clearance) of the tapered roller self-aligning bearing used for rolls (hereinafter referred to as the tapered roller self-aligning bearing) not only determines the assembly accuracy of the roll device but also affects the roll gap accuracy in cold tube rolling. The so-called roll gap is the clearance value between the upper and lower rolls after installation on the machine. If the roll gap is large, the annular hole-shaped rolling groove will slightly overflow into the space on both sides of the roll gap. When the seamless steel pipe rotates, the overflowed part will be squeezed in the rolling groove, forming a folded "rolling fold". If the roll gap is small, it is easy to cause the inner concave of the edge of the rolling groove, resulting in irregular pits on the surface of the seamless steel pipe (commonly known as fly feet). Therefore, the assembly accuracy of the tapered roller self-aligning bearing is the key step in the installation process of the entire roll device.

[0008] Bearing clearance refers to the amount of movement when one of the inner or outer rings of a bearing is fixed and the unfixed one is moved radially or axially without the bearing being installed on the shaft or bearing housing. According to its state, it can be divided into four categories: theoretical clearance, working clearance, installation clearance, and effective clearance. Among them, the working clearance is the clearance of the bearing when it is installed on the machine and subjected to a certain load, that is, the effective clearance plus the elastic deformation amount generated by the bearing load, which is also the clearance during operation. Its size has a direct impact on the fatigue life, temperature rise, noise, vibration and other performance of the rolling bearing, and at the same time plays a key role in the operation accuracy of the mechanism where it is located.

[0009] Currently, the assembly processing procedure of the roll device of the seamless steel pipe cold rolling mill under offline (offline working condition) mainly consists of six steps: assembly preparation → assembly of the annular hole type → installation of the right bearing housing → installation of the left bearing housing → installation of the gear → inspection and warehousing. Among them, the assembly of the annular hole type adopts the temperature difference method for orientation assembly, and the assembly of the bearing housing (including the tapered roller self-aligning bearing) and the gear adopts the normal temperature hydraulic orientation assembly process. The aforementioned offline assembly method can complete the orientation assembly processing of the roll device of the seamless steel pipe cold rolling mill, but there are still certain deficiencies, namely:

[0010] 1) The assembly accuracy of spherical roller bearings is not easily controllable: Currently, most of the rolling bearings selected for the roll devices of two-high periodic seamless steel tube cold rolling mills are spherical roller bearings with tapered bores. This type of rolling bearing has two rows of short cylindrical spherical rollers, an outer ring with a common concave spherical raceway, an inner ring with two concave raceways inclined at an angle to the bearing axis, and the center of curvature of the outer ring raceway coincides with the bearing center. The spherical roller bearing is self-aligning and is not affected by the misalignment between the shaft and the bearing housing (seat) or the deflection of the shaft, and can compensate for the concentricity error caused thereby. In addition to radial loads, it can also withstand bidirectional axial loads and their combined loads, has a large load-carrying capacity, and at the same time has good anti-vibration and anti-shock capabilities. The spherical roller bearing is installed in the bearing housing, the outer ring is fitted with the inner circular hole of the bearing housing, and the inner ring is fitted with the roll shaft. When assembling new bearings, the working clearance (movement clearance) of the rolling elements is not measured and they are directly assembled. This method does not measure and adjust the working clearance (movement clearance) of the spherical roller bearing, and the bearing installation accuracy completely depends on the bearing machining accuracy. However, in cold tube rolling, there is a certain amount of micro elastic deformation in the working clearance (movement clearance) of the spherical roller bearing, which directly affects the roll gap accuracy.

[0011] 2) The installation accuracy of the tapered surface is not easy to grasp, which affects the accuracy of the spherical roller bearing and increases the difficulty of subsequent disassembly of the bearing and the gear. Currently, most of the mounting journals of the bearings and end gears of the roll devices of two-high periodic seamless steel tube cold rolling mills are conical, and the installation and bearing positioning are carried out by relying on the end face normal pressure. A large normal pressure is not conducive to the subsequent directional disassembly of the bearing and the gear, a small normal pressure cannot play an axial positioning role, and the normal pressure is an important factor affecting the working clearance (movement clearance) of the spherical roller bearing. In the existing roll device assembly process, the normal pressure is not clearly defined, which is not conducive to standardized operation. In production practice, the hammering method is mostly used for installation, that is, a 16P copper hammer or a combination of a steel hammer and a copper bar is used to strike the top of the inner ring of the spherical roller bearing. The labor intensity is high, the stress point is easily damaged, there are certain safety hazards, and the positioning accuracy of the bearing installation is not controllable; especially for the spherical roller bearing in the left bearing housing, due to the protrusion of the journal of the gear section of the roll shaft, the hammering operation is more inconvenient.

[0012] 3) The installation method of the bearing housing is not entirely reasonable: Currently, the bearing housing is pre-assembled, that is, the gland and the spherical roller bearing are pre-assembled on the bearing housing first, and then the whole is installed on the roll shaft. Its disadvantage is that it is impossible to observe and measure the fitting and inclusion situation between the tapered bore of the inner ring of the spherical roller bearing and the roll shaft, especially it is impossible to know the actual contact situation between the inner ring of the bearing and the spacer ring. If the end face of the inner ring is flush with the end face of the spacer ring, the inclusiveness of the inner tapered bore may not be completely in place. If the distance between the end face of the inner ring and the end face of the spacer ring is too large, it will affect the axial installation accuracy of the bearing housing.

[0013] In existing patent applications, for example, Chinese Patent Application No. 201310740067.4 discloses a method for adjusting the working clearance of rolling bearings in a seamless steel tube cold rolling mill roll device. The applicable bearing is a four-row tapered roller bearing, which is completely different from the tapered bore short cylindrical roller self-aligning bearing applicable to the present invention in structure.

[0014] For example, Chinese Patent Application No. 202110011612.0 discloses a precise disassembly method for a roll device of a seamless steel tube cold rolling mill, which is applicable to the precise disassembly and disassembly operation of the roll device of a two-high periodic seamless steel tube cold rolling mill, and is completely different from the offline assembly method applicable to the present invention.

[0015] In summary, in the current precision assembly method of the two-high periodic seamless steel tube roll device, although it can meet the offline assembly and processing of the roll device, there are certain deficiencies in aspects such as the working clearance (movement clearance) and axial positive pressure of the tapered roller self-aligning bearing, which affect the roll gap accuracy, service life of the roll device, and subsequent disassembly and processing operations, and have a certain impact on ensuring the orderly operation of the seamless steel tube cold rolling production line. Therefore, targeted technical improvements are implemented on the existing roll device assembly process method, the operation process is optimized, and on the basis of ensuring the operation efficiency, the working clearance (movement clearance) accuracy and axial positive pressure accuracy of the tapered roller self-aligning bearing are improved, the installation accuracy and service life of the roll device are ensured, the equipment maintenance and production costs are reduced, and the requirements for the orderly production of seamless steel tubes of high-strength steel grades are further met. Summary of the Invention

[0016] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide an assembly method for a roll device of a seamless steel tube cold rolling mill, which effectively ensures the assembly accuracy and service life of the roll device and meets the technical requirements for the cold rolling pipe production of seamless steel tubes of high-strength steel grades.

[0017] To achieve the above object, the present invention adopts the following technical solutions:

[0018] An assembly method for a roll device of a seamless steel tube cold rolling mill includes the following steps:

[0019] S1, assembly preparation;

[0020] S2, assembling the ring hole type;

[0021] S3, installing the right bearing housing;

[0022] S4, adjusting the assembly accuracy of the right bearing;

[0023] S5, installing the left bearing housing;

[0024] S6, adjusting the assembly accuracy of the left bearing;

[0025] S7, Install the gear;

[0026] S8, Inspect and store in the warehouse.

[0027] Preferably, the assembly preparation in the step S1 specifically includes the following steps:

[0028] S11, Safety preparation, including informing about the operation items, safety technical disclosure, implementation of on-site safety prevention measures, and cleaning of the operation site environment;

[0029] S12, Personnel preparation, including verifying personnel qualifications and ensuring they hold relevant certificates to work;

[0030] S13, Material preparation, including collecting relevant parts from the warehouse, cleaning, wiping, removing burrs, and verifying and confirming relevant technical parameters according to the drawings;

[0031] S14, Tooling preparation, implementing relevant tooling according to the operation items.

[0032] Preferably, the assembly of the ring hole type in the step S2 specifically includes the following steps:

[0033] S21, Place the journal of the roller shaft gear section of the roller downward and stand it vertically;

[0034] S22, Install the positioning key, orient and install the positioning key in the rectangular groove on the journal of the roller shaft gear section of the roller, and fasten it with an internal hexagon screw;

[0035] S23, Place the ring hole type with the positioning keyway downward and flat on a special circular support, and the bottom of the ring hole type is at least 300 mm above the ground;

[0036] S24, Use a lifting device to vertically hoist the electromagnetic heating coil, vertically and orientedly sleeve the electromagnetic heating coil on the ring hole type, after the inner ring of the electromagnetic heating coil fits flush with the outer cylindrical surface of the ring hole type, insert the bottom plug board of the electromagnetic heating coil, and then the lifting device descends so that the electromagnetic heating coil is supported by the ring-shaped support;

[0037] S25, Connect the power supply to heat, use an infrared temperature measuring gun to measure the heating temperature, and observe the states of the ring hole type and the electromagnetic heating coil in real time;

[0038] S26, Assemble the ring hole type by the temperature difference method;

[0039] S27, Cool by natural cooling.

[0040] Preferably, observing the states of the ring hole type and the electromagnetic heating coil in the step S25 is specifically:

[0041] The expansion equivalent is the product of the inner diameter value of the ring hole type, the coefficient of thermal expansion, and the actual heating temperature difference, and is proportional to the inner diameter of the ring hole type and the absolute temperature difference value at the working station after heating.

[0042] Preferably, the installation of the right bearing seat in step S3 specifically includes the following steps:

[0043] S31, install the second spacer ring, and install the second spacer ring on the roll shaft of the roll in a directional manner. The bottom end face of the second spacer ring is flush with the end face of the ring hole type.

[0044] S32, install the second through cover, with the inner convex step face of the second through cover facing up, and install it on the roll shaft of the roll in a directional manner. The inner hole of the second through cover encloses the second spacer ring, and the bottom end face of the second through cover is flush with the end face of the ring hole type.

[0045] S33, pre-assemble the rolling bearing, and install the tapered bore short cylindrical roller self-aligning bearing in the inner cylindrical hole of the bearing seat with the small diameter section of the tapered bore facing up.

[0046] S34, use a feeler gauge to check the installation accuracy of the bearing.

[0047] S35, install the right bearing seat by the temperature difference method.

[0048] S36, perform cooling by the natural cooling method.

[0049] Preferably, the adjustment of the assembly accuracy of the right bearing in step S4 specifically includes the following steps:

[0050] S41, install the adjustment tooling, displace the entire roll into the rectangular bracket, install a support seat on the top end face of the roll, and the stepped shoulder of the support seat is flush with the top end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing.

[0051] S42, install the hydraulic appliance.

[0052] S43, use the hydraulic appliance to adjust the working clearance of the bearing.

[0053] S44, confirm the working clearance value, and use the working clearance value L = 0.02 - 0.10 mm as the judgment standard.

[0054] S45. Determine the working clearance of the bearing. If the measured working clearance value L is less than 0.02 mm, it indicates that the working clearance is too small and the bearing needs to be replaced and reinstalled. If the working clearance value L is greater than 0.10 mm, it indicates that the working clearance is too large and the inner ring needs to be pressed down again for adjustment, but the pressing force shall not exceed the output pressure value of the hydraulic appliance corresponding to the bearing of this specification model. If the working clearance value L is still greater than the standard value range, the bearing needs to be disassembled and the second spacer ring needs to be replaced.

[0055] S46. Remove the hydraulic appliance.

[0056] S47. Use a feeler gauge to re-check and confirm the installation accuracy of the bearing.

[0057] S48. Install the second through cover and the second end cover.

[0058] Preferably, the installation of the left bearing seat in step S5 specifically includes the following steps:

[0059] S51. Flip the roll, and use the lifting equipment to flip the roll 180°, with the end with the right bearing seat installed facing down.

[0060] S52. Install the first spacer ring, and install the first spacer ring on the roll shaft in a directional manner. The bottom end face of the first spacer ring is flush with the end face of the ring hole type.

[0061] S53. Install the first through cover, with the inner raised step face of the first through cover facing up, and install it on the roll shaft in a directional manner. The inner hole of the first through cover contains the first spacer ring, and the bottom end face of the first through cover is flush with the end face of the ring hole type.

[0062] S54. Pre-assemble the rolling bearing, and install the tapered bore short cylindrical roller self-aligning bearing in the inner cylindrical hole of the bearing seat with the small diameter section of the tapered bore facing up in a directional manner.

[0063] S55. Use a feeler gauge to check the installation accuracy of the bearing.

[0064] S56. Install the left bearing seat using the differential temperature method.

[0065] S57. Use the natural cooling method for cooling.

[0066] Preferably, the adjustment of the assembly accuracy of the left bearing in step S6 specifically includes the following steps:

[0067] S61. Install an adjustment tooling to displace the roll as a whole into the rectangular bracket. A transition sleeve is installed on the roll in a directional manner. The bottom end face of the transition sleeve is flush with the top end face of the tapered bore cylindrical roller self-aligning bearing. A support seat is installed on the top end face of the roll. The stepped shaft shoulder of the support seat is flush with the top end face of the transition sleeve;

[0068] S62. Install a hydraulic appliance;

[0069] S63. Use the hydraulic appliance to adjust the working clearance of the bearing;

[0070] S64. Confirm the working clearance value, and use the working clearance value L = 0.02 - 0.10 mm as the judgment criterion;

[0071] S65. Judge the working clearance of the bearing. If the measured working clearance value L is less than 0.02 mm, it means that the working clearance is too small and the bearing needs to be replaced and reinstalled. If the working clearance value L is greater than 0.10 mm, it means that the working clearance is too large and the inner ring needs to be pressed down again for adjustment, but the downward pressure shall not exceed the output pressure value of the hydraulic appliance corresponding to the bearing of this specification model. If the working clearance value L is still greater than the standard value range, the bearing needs to be disassembled and the first spacer ring needs to be replaced;

[0072] S66. Remove the hydraulic appliance;

[0073] S67. Use a feeler gauge to detect and confirm the installation accuracy of the bearing again;

[0074] S68. Install the first through cover and the first end cover.

[0075] Preferably, the installation of the gear in step S7 specifically includes the following steps:

[0076] S71. Install a flat key and install the flat key in the rectangular groove of the roll shaft of the roll in a directional manner;

[0077] S72. Install the first spacing ring. After aligning the inner hole rectangular groove of the first spacing ring with the flat key, install it on the roll shaft of the roll in a directional manner;

[0078] S73. Install the gear. Use the temperature difference method to install the gear on the roll shaft of the roll. The bottom end face of the gear is flush with the top end face of the first spacing ring;

[0079] S74. Install the gear cone sleeve and install the large-diameter tapered bore of the gear cone sleeve downward in the tapered ring formed by the roll shaft of the roll and the gear in a directional manner;

[0080] S75. Position the gear cone sleeve;

[0081] S76. Fasten the gear end cover to the end face of the roll shaft of the said roll.

[0082] S77. Adopt natural cooling method for cooling.

[0083] Preferably, the inspection and warehousing in the step S8 specifically include the following steps:

[0084] S81. Finish cleaning, including cleaning the operation site, hydraulic tooling, and recycling of tools.

[0085] S82. Inspection. Conduct relevant parameter inspection on the assembled roll according to the drawing. After filling with lubricating grease, hang a label and warehousing or put it into use on the machine.

[0086] An assembly method for a roll device of a seamless steel tube cold rolling mill provided by the present invention has the following

[0087] Beneficial effects:

[0088] 1) Reasonable design, smooth process, orderly connection of working steps, safe, reliable, practical and efficient, with high offline assembly accuracy of the roll device;

[0089] 2) Utilize the contact fit between the roll shaft and the conical surface of the spherical roller bearing with tapered bore, and adopt axial positive pressure to realize the accuracy adjustment of the working clearance (movement clearance) of the bearing, so as to ensure the roll gap accuracy in cold rolling of steel tubes;

[0090] 3) Effectively ensure the assembly accuracy and service life of the roll device, with good rolling stability, meet the technical requirements of seamless steel tube cold rolling production of high-strength steel grades, and improve the core competitiveness of enterprises in high-end seamless steel tube production;

[0091] 4) Do not need to increase the investment in equipment and special tools, with low implementation cost, less investment, high cost performance, and easy to implement and apply on site;

[0092] 5) The operation method can be replicated, inherited and solidified, reduce the requirements for the experience and skills of operators, etc., and is conducive to human resource organization;

[0093] 6) The roll assembly accuracy is controlled, there is no repetitive operation, labor and time are saved, and it meets the requirements of orderly production of the seamless steel tube cold rolling production line;

[0094] 7) Strong universality, applicable to all current models and specifications of two-high reversing cold rolling mills for seamless steel tubes, with broad application prospects;

[0095] 8) It has certain reference and application value for the improvement of the offline assembly process method of the roll device of the current similar two-high reversing cold rolling mills for seamless steel tubes. Description of the Drawings

[0096] Figure 1 is a structural schematic diagram of an existing roll device;

[0097] Figure 2 is Figure 1 a side view schematic diagram;

[0098] Figure 3 is a process flow chart of the assembly method of the present invention;

[0099] Figure 4 is a flow chart of the assembly method of the present invention;

[0100] Figure 5 is a schematic diagram of step S2 in the assembly method of the present invention;

[0101] Figure 6 is a schematic diagram of step S3 in the assembly method of the present invention;

[0102] Figure 7 is a schematic diagram of step S4 in the assembly method of the present invention;

[0103] Figure 8 is a schematic diagram of step S5 in the assembly method of the present invention;

[0104] Figure 9 is a schematic diagram of step S6 in the assembly method of the present invention;

[0105] Figure 10 is a structural schematic diagram of a tapered bore short cylindrical roller self-aligning bearing, (a) is the front view, and (b) is the top view;

[0106] Figure 11 is a schematic diagram of step S7 in the assembly method of the present invention. Detailed implementation manners

[0107] In order to better understand the above technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.

[0108] In conjunction with Figure 3 and Figure 4 as shown, an assembly method for a roll device of a seamless steel tube cold rolling mill provided by the present invention includes the following steps:

[0109] S1, assembly preparation, specifically including the following steps:

[0110] S11, safety preparation, including job item notification, safety technical disclosure, implementation of on-site safety prevention measures, cleaning of the on-site environment, etc.;

[0111] S12, personnel preparation, including verification of personnel qualifications and taking up posts with certificates, etc.;

[0112] S13, Material preparation, including requisitioning relevant components from the warehouse, cleaning, decontaminating, wiping, deburring, and verifying and confirming relevant technical parameters with reference to the drawings;

[0113] S14, Equipment preparation, implementing relevant tooling equipment according to the operation items, such as electromagnetic heaters, jacks, manual hydraulic pumps, wrenches, feeler gauges, etc.

[0114] S2, Assembling the ring hole type, as combined with Figure 5 shown, specifically including the following steps:

[0115] S21, Place the journal of the gear section of the roll shaft 20 of the roll downward and stand it vertically.

[0116] S22, Install the positioning key. Orient and install the positioning key in the rectangular groove on the journal of the gear section of the roll shaft 20 of the roll, and fasten it with an internal hexagon screw. When necessary, thread locking agent can be applied to the threaded section.

[0117] S23, Place the ring hole type 21 with its positioning keyway downward and flat on a special circular support. The distance from the bottom of the ring hole type 21 to the ground (i.e., the height of the support) shall be not less than 300 mm.

[0118] S24, Use a lifting device 22 (such as a crane or electric hoist, etc.) to vertically hoist the electromagnetic heating coil 23 (select a matching electromagnetic heating coil for different specifications of roll devices). Vertically and directionally sleeved the electromagnetic heating coil 23 on the ring hole type 21. After the inner ring of the electromagnetic heating coil 23 fits flush with the outer cylindrical surface of the ring hole type, insert the bottom plug board of the electromagnetic heating coil 23. Then the lifting device descends slightly, and the steel wire rope 24 is in a loose condition, so that the electromagnetic heating coil 23 is supported by the annular support.

[0119] S25, Connect the power supply of the electromagnetic heating coil 23 to energize and heat. Use an infrared temperature measuring gun to measure the heating temperature (the heating temperature of the ring hole type is 300 - 350 °C, especially 320 - 330 °C is appropriate), and observe the states of the ring hole type and the electromagnetic heating coil in real time. The expansion equivalent is approximately the product of the inner diameter value of the ring hole type 21, the coefficient of thermal expansion, and the actual heating temperature difference, and is proportional to the absolute temperature difference between the inner diameter of the ring hole type 21 and the working station after heating.

[0120] S26. Orient and assemble the ring hole type 21 using the temperature difference method. After the ring hole type 21 expands due to heat (with a thermal expansion coefficient of 0.012 mm / m·°C), measure the inner diameter of the heated and expanded ring hole type 21 using an internal diameter caliper. Compare the inner diameter of the ring hole type 21 after expansion with the diameter of the ring hole type journal section of the roll shaft 20 of the roll. The inner diameter of the ring hole type 21 should be at least 0.30 - 0.50 mm larger than the outer diameter of the journal. The lifting equipment 22 vertically lifts the electromagnetic heating coil 23 and synchronously drives the heated ring hole type 21 to move to the upper space of the vertically standing roll shaft 20. Align the inner hole of the ring hole type 21 with the roll shaft 20. Lower the hook of the lifting equipment 22. After the bottom rectangular keyway of the ring hole type 21 is aligned with the positioning key, gradually lower the electromagnetic heating coil 23 until the bottom of the ring hole type 21 fits against the shoulder of the roll shaft 20 (while the positioning key fits into and is embraced by the rectangular keyway). The lifting equipment 22 pauses for at least 10 minutes. After the ring hole type 21 and the roll shaft 20 are fully embraced (interference fit), remove the four bottom inserts of the electromagnetic heating coil 23, lift the hook of the lifting equipment 22, place the electromagnetic heating coil 23 at a dedicated station, and remove the sling of the electromagnetic heating coil 23 from the lifting equipment 22;

[0121] S27. Use the natural cooling method for cooling. When production is urgently needed, mechanical cooling can be used (align an axial flow fan to blow air at the combination of the ring hole type and the roll shaft), and take the surface temperatures of the top, bottom, rolling grooves of the ring hole type 21 and the bearing section and gear section journal surfaces of the roll shaft 20 being equivalent to the room temperature measured by an infrared thermometer gun as the standard for cooling in place.

[0122] S3. Install the right bearing housing, as shown in Figure 6 which specifically includes the following steps:

[0123] S31. Install the second isolation ring 25. Orient and install the second isolation ring 25 on the roll shaft 20, and make the bottom end face of the second isolation ring 25 fit flush with the end face of the ring hole type 21;

[0124] S32. Install the second through cover 26. Orient and install the second through cover 26 on the roll shaft 20 with the inner convex step face facing up. The inner hole of the second through cover 26 encloses the second isolation ring 25, and the bottom end face of the second through cover 25 fits flush with the end face of the ring hole type 21;

[0125] S33. Pre - install the rolling bearing. Install the tapered - hole short - cylindrical roller self - aligning bearing 27 in the inner cylindrical hole of the bearing housing 28 with the small - diameter section of the tapered hole facing up (ensure the cleanliness of the surface of the roll shaft 20 and the inner hole surface of the tapered - hole short - cylindrical roller self - aligning bearing 27 during installation, and spray clean lubricating oil if necessary). The installation method can use the temperature difference method, i.e., heating the bearing as a whole; or the hammering method, using a copper hammer to strike the inner ring end face of the bearing. Generally, from the perspective of ensuring assembly accuracy, the temperature difference method is selected;

[0126] S34. Check the installation accuracy of the bearing. Use a feeler gauge to measure the distance value D1 between the lower end face of the self-aligning roller bearing with tapered bore 27 and the upper end face of the second spacer ring 25, and D1 should not be less than 1.0 mm, preferably 1.0 - 2.0 mm (selected according to the bearing specifications. The larger the inner diameter of the bearing, the upper limit of the distance value D1 is taken; the smaller the inner diameter of the bearing, the lower limit of the distance value D1 is taken).

[0127] S35. Install the bearing housing 28. Install the bearing housing 28 by the temperature difference method. Heat the bearing housing 28 as a whole (it is advisable to use an oil cylinder, and the heating temperature is preferably 300 - 350 degrees). Use a lifting device 22 (install a lifting lug at the end face threaded hole) to install the bearing housing 28 on the self-aligning roller bearing with tapered bore 27 in a directional manner. It is advisable that the bottom end face of the bearing housing 28 is flush with the bottom end face of the outer ring of the self-aligning roller bearing with tapered bore 27 or the inner ring is recessed by 5 mm.

[0128] S36. Use the natural cooling method for cooling. When production is in urgent need, mechanical cooling can be used (an axial flow fan blows air at the bearing housing 28). Use an infrared temperature gun to measure that the temperatures of the top end face and bottom end face of the self-aligning roller bearing with tapered bore 27 and the outer surface of the bearing housing 28 are equivalent to the room temperature, which is used as the standard for cooling in place.

[0129] S4. Adjust the assembly accuracy of the right - hand bearing. As shown in Figure 7 and Figure 10 , it specifically includes the following steps:

[0130] S41. Install the adjustment tooling. Displace the roll as a whole into the rectangular support 29. Install a support seat 30 on the top end face of the roll. The stepped shoulder of the support seat 30 fits flush with the top end face of the inner ring of the self-aligning roller bearing with tapered bore 27.

[0131] S42. Install the hydraulic appliances. Install the hydraulic tooling 31 (such as a P392 hydraulic pump). Connect the hydraulic tooling 31 and the jack 33 fixed on the end face of the roll shaft 20 through a high - pressure oil pipe 32. Install the jack 33 between the top beam of the rectangular support 29 and the upper plane of the support seat 30.

[0132] S43. Adjust the working clearance of the bearing. Start the hydraulic tooling 31. The piston of the jack 33 extends upward. Under the action of the reaction force restricted by the cross beam of the rectangular support 29, the support seat 30 presses down, transmitting a downward pressure to the inner ring of the self-aligning roller bearing with tapered bore 27 (the output pressure of the hydraulic tooling 31 is preferably 15 - 30 MPa, and it is selected according to the bearing specifications. The larger the inner diameter of the bearing, the upper limit of the pressure value is taken; the smaller the inner diameter of the bearing, the lower limit of the pressure value is taken). The inner ring moves downward, and the inner ring expands slightly due to the action of the tapered bore. Then use a feeler gauge to measure the clearance value between the bearing rolling elements and the outer ring according to three equal parts, record the parameters, and calculate according to the model of the working clearance value L=(L1 + L2 + L3) / 3 to obtain the measured and corrected working clearance value.

[0133] S44. Confirm the working clearance value. For the short cylindrical roller self-aligning bearing with tapered bore 27 used for rolls of different specifications, referring to the calculation model, use the working clearance value L = 0.02 - 0.10 mm as the judgment standard (selected according to the bearing specifications. The larger the inner diameter of the bearing, the upper limit of the spacing value L is taken; the smaller the inner diameter of the bearing, the lower limit of the spacing value L is taken), and then recheck.

[0134] S45. Judgment of the working clearance of the bearing. If the actually measured working clearance conforms to the range of L = 0.02 - 0.10 mm according to the bearing specifications, it can be judged that the working clearance is qualified; if the actually measured working clearance value L is less than 0.02 mm, it means that the working clearance is too small and the bearing needs to be replaced and reinstalled; if the working clearance value L is greater than 0.10 mm, it means that the working clearance is too large and the inner ring needs to be pressed down again for adjustment, but the pressing force shall not exceed the output pressure value of the hydraulic appliance corresponding to this specification type of bearing. If the working clearance value L is still greater than the standard value range, the bearing needs to be disassembled and the second spacer ring 25 needs to be replaced.

[0135] S46. Remove the hydraulic appliance and take out appliances such as the jack 33 and the support seat 30.

[0136] S47. Then detect and confirm the installation accuracy of the bearing. Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the short cylindrical roller self-aligning bearing with tapered bore 27 with qualified working clearance and the end face of the second spacer ring 25, and it is appropriate to be 0.2 - 1.0 mm (selected according to the bearing specifications. The larger the inner diameter of the bearing, the upper limit of the spacing value D1 is taken; the smaller the inner diameter of the bearing, the lower limit of the spacing value D1 is taken). The purpose is to confirm the tolerance of the tapered bore of the bearing to the roller shaft; if the spacing value D1 = 0, the bearing needs to be removed and the end face of the spacer ring needs to be ground. Note: Usually, when the spacing value meets the standard during pre-assembly, it will not exceed the tolerance after hydraulic pressing. Therefore, the inspection during pre-assembly is crucial and can avoid subsequent rework.

[0137] S48. Install the second through cover 26 and the second end cover. Move the roll out of the rectangular bracket 29 station. Use hexagon bolts to fix the gland in the threaded hole at the end of the roller shaft 20, use the method of pressing strip flanging to prevent loosening, use fastening screws to fix the second through cover 26 to the bottom end face of the bearing housing 28, and use washers to prevent loosening. When installing the second through cover 26, the inner convex step of the second through cover 26 fits flush with the end face of the inner ring of the bearing (the bearing housing 28 and the outer ring of the bearing are displaced due to the axial pressure of the screw fastening, so as to achieve the flush of the inner ring and the second through cover 26), and use fastening screws and washers to fix the second end cover to the outer end face of the bearing housing 28.

[0138] S5. Install the left bearing housing, combined with Figure 8 as shown in the figure, which specifically includes the following steps:

[0139] S51. Flip the roll. Use the lifting equipment 22 to flip the roll by 180°, with the end with the installed bearing housing 28 facing downwards, and the end cover of the bearing housing 28 being in contact with the station floor.

[0140] S52. Install the first isolation ring 34. Install the first isolation ring 34 directionally on the roll shaft 20 of the roll, with the bottom end face of the first isolation ring 34 being flush with the end face of the ring hole type 21.

[0141] S53. Install the first through cover 35. Place the inner convex step face of the first through cover 35 upwards and install it directionally on the roll shaft 20 of the roll. The inner hole of the first through cover 35 encloses the first isolation ring 34, and the bottom end face of the first through cover 35 is flush with the end face of the ring hole type 21.

[0142] S54. Pre - install the rolling bearing. Install the spherical roller bearing with tapered bore 36 directionally in the inner cylindrical hole of the bearing housing 37 with the small - diameter section of the tapered bore facing upwards (ensure the cleanliness of the surface of the roll shaft 20 and the inner hole surface of the spherical roller bearing with tapered bore 36 during installation, and clean lubricating oil can be sprayed if necessary). The installation method can be the temperature - difference method, i.e., heating the bearing as a whole; or the hammering method, using a copper hammer to strike the end face of the inner ring of the bearing. Generally, from the perspective of ensuring assembly accuracy, the temperature - difference method is selected.

[0143] S55. Check the installation accuracy of the bearing. Use a feeler gauge to measure that the distance value D1 between the lower end face of the spherical roller bearing with tapered bore 36 and the upper end face of the first isolation ring 34 is not less than 1.0 mm, preferably 1.0 - 2.0 mm (selected according to the bearing specifications. The larger the bearing inner diameter, the upper limit of the distance value D1 is taken; the smaller the bearing inner diameter, the lower limit of the distance value D1 is taken).

[0144] S56. Install the bearing housing 37. Install the bearing housing 37 by the temperature - difference method. Heat the bearing housing 37 as a whole (it is advisable to use an oil cylinder, and the heating temperature is preferably 300 - 350 degrees). Use the lifting equipment 22 (install a lifting lug at the end - face threaded hole) to install the bearing housing 37 directionally on the spherical roller bearing with tapered bore 36. The bottom end face of the bearing housing 37 is preferably flush with the bottom end face of the outer ring of the spherical roller bearing with tapered bore 36 or the inner ring is recessed by 5 mm.

[0145] S57. Use the natural cooling method for cooling. When production is in urgent need, mechanical cooling can be used (an axial - flow fan blows air towards the bearing housing 37), and use an infrared temperature - measuring gun to measure that the temperature of the top end face and the bottom end face of the spherical roller bearing with tapered bore 36 and the outer surface of the bearing housing 37 is equivalent to the room temperature as the standard for cooling in place.

[0146] S6. Adjust the assembly accuracy of the left - hand bearing. As shown in Figure 9 and Figure 10 , it specifically includes the following steps:

[0147] S61. Install and adjust the tooling. Displace the entire roll into the rectangular bracket 37. Orientally install a transition sleeve 38 on the roll shaft 20. The bottom end face of the transition sleeve 38 is flush with the top end face of the tapered bore short cylindrical roller self-aligning bearing 36. Install a support seat 39 on the top end face of the roll. The stepped shoulder of the support seat 39 is flush with the top end face of the transition sleeve 38.

[0148] S62. Install the hydraulic apparatus. Install a hydraulic tooling 40 (such as a P392 hydraulic pump), connect the hydraulic tooling 40 and a jack 42 fixed on the end face of the roll shaft 20 through a high-pressure oil pipe 41, and install the jack 42 between the top beam of the rectangular bracket 37 and the upper plane of the support seat 39.

[0149] S63. Adjust the working clearance of the bearing. Start the hydraulic tooling 40. The piston of the jack 42 extends upward. Subject to the reaction force of restraint from the cross beam of the rectangular bracket 37, the support seat 39 presses down, transmitting a downward pressure to the inner ring of the tapered bore short cylindrical roller self-aligning bearing 36 (the output pressure of the hydraulic tooling 40 is preferably 15 - 30 MPa and is selected according to the bearing specifications. The larger the inner diameter of the bearing, the higher the pressure value; the smaller the inner diameter of the bearing, the lower the pressure value). The inner ring moves downward, and the inner ring expands slightly due to the action of the tapered bore. Then, use a feeler gauge to measure the clearance value between the bearing rolling elements and the outer ring according to three equal parts, record the parameters, and calculate according to the working clearance value model L=(L1 + L2 + L3) / 3 to obtain the measured and corrected working clearance value.

[0150] S64. Confirm the working clearance value. For the tapered bore short cylindrical roller self-aligning bearing 36 used for rolls of different specifications, refer to the calculation model and use the working clearance value L = 0.02 - 0.10 mm as the judgment standard (selected according to the bearing specifications. The larger the inner diameter of the bearing, the higher the spacing value L; the smaller the inner diameter of the bearing, the lower the spacing value L) and then recheck.

[0151] S65. Judgment of the working clearance of the bearing. If the measured working clearance conforms to the range of L = 0.02 - 0.10 mm according to the bearing specifications, the working clearance can be judged to be qualified. If the measured working clearance value L is less than 0.02 mm, it means that the working clearance is too small and the bearing needs to be replaced and reinstalled. If the working clearance value L is greater than 0.10 mm, it means that the working clearance is too large and the inner ring needs to be pressed down again for adjustment, but the downward pressure shall not exceed the output pressure value of the hydraulic apparatus corresponding to this specification and type of bearing. If the working clearance value L is still greater than the standard value range, the bearing needs to be disassembled and the first spacer ring 34 needs to be replaced.

[0152] S66. Remove the hydraulic apparatus. Remove tools such as the jack 42 and the support seat 39.

[0153] S67. Then, recheck and confirm the installation accuracy of the bearing. Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the short cylindrical roller self-aligning bearing 36 with a tapered bore and qualified working clearance and the end face of the first spacer ring 34. It is advisable to be 0.2 - 1.0 mm (selected according to the bearing specifications. The larger the bearing inner diameter, the upper limit of the distance value D1 is taken; the smaller the bearing inner diameter, the lower limit of the distance value D1 is taken). The purpose is to confirm the tolerance of the bearing tapered bore to the roller shaft. If the distance value D1 = 0, the bearing needs to be removed and the end face of the spacer ring needs to be ground. Note: Usually, the distance value meets the standard during pre-assembly, and it will not exceed the tolerance after hydraulic pressing. Therefore, the inspection during pre-assembly is crucial to avoid subsequent rework.

[0154] S68. Install the first through cover 35 and the first end cover. Move the roller out of the rectangular support 37 station. Use hexagon bolts to fix the gland in the threaded hole at the end of the roller shaft 20. Use the method of pressing strip flanging to prevent loosening. Use fastening screws to fix the first through cover 35 to the bottom end face of the bearing housing 37, with a washer to prevent loosening. When installing the first through cover 35, the inner convex step of the first through cover 35 fits flush with the end face of the inner ring of the short cylindrical roller self-aligning bearing 36 with a tapered bore (the outer ring of the bearing housing 37 and the short cylindrical roller self-aligning bearing 36 with a tapered bore are displaced due to the axial pressure of screw fastening, thus achieving the flush of the inner ring and the first through cover 35). Use fastening screws and washers to fix the first end cover to the outer end face of the bearing housing 37.

[0155] S7. Install the gear, as shown in Figure 11 and specifically includes the following steps:

[0156] S71. Install the flat key and orientally install the flat key in the rectangular groove of the roller shaft 20 of the roller.

[0157] S72. Install the first spacer ring 43. After aligning the rectangular groove in the inner hole of the first spacer ring 43 with the flat key, orientally install it on the roller shaft 20 of the roller. During installation, it is necessary to ensure the cleanliness of the contact surface (cylindrical surface) between the first spacer ring 43 and the roller shaft 20, and the bottom end face of the first spacer ring 43 fits flush with the top end face of the inner ring of the short cylindrical roller self-aligning bearing 27 / 36.

[0158] S73. Install the gear 44. Use the differential temperature method to heat the gear 44 as a whole to 300 - 350 °C. Orientally install the heated gear 44 as a whole on the roller shaft 20 with the gear section facing up. The bottom end face of the gear 44 is flush with the top end face of the first spacer ring 43.

[0159] S74. Install the gear taper sleeve 45, and install the large-diameter conical hole of the gear taper sleeve 45 downward in the conical ring formed by the combination of the roller shaft 20 and the gear 44. During installation, it is necessary to ensure the cleanliness of the surface of the roller shaft 20, the inner hole surface of the gear 44, and the inner and outer surfaces of the gear taper sleeve 45. When necessary, clean lubricating oil can be sprayed, and then use a copper hammer or a combination of a hammer and a copper rod to strike the top end face of the gear taper sleeve 45 to gradually press down the gear taper sleeve 45;

[0160] S75. Position the gear taper sleeve 45. Move the rolling mill into a special working position (rectangular bracket 46). Install the pressure plate 47 and the support seat 48 on the top of the roller shaft 20 and the gear 44. The end face of the pressure plate 47 is flush with the top end face of the gear taper sleeve 45. Install the hydraulic tooling 49 (such as the P392 hydraulic pump), connect the hydraulic tooling 49 to the jack 51 fixed on the end face of the roller shaft 20 through the high-pressure oil pipe 50, install the jack 51 between the top beam of the rectangular bracket 46 and the upper plane of the support seat 48. Start the hydraulic tooling 49, the piston of the jack 51 extends upward, and under the action of the reaction force of the cross beam of the rectangular bracket 46, the support seat 48 is pressed down, and the downward pressure is transmitted to the end face of the gear taper sleeve 45 through the pressure plate 47 to displace the gear taper sleeve 45 downward until the conical hole of the gear taper sleeve 45 completely fits and encloses the shaft conical surface of the rolling mill. Due to the downward pressure of the conical hole, the gear taper sleeve 45 expands slightly and completely encloses and fits with the gear 44 after heating expansion;

[0161] S76. Fix the gear end cover in the threaded hole on the end face of the roller shaft 20 with fastening screws and washers;

[0162] S77. Use the natural cooling method for cooling. When production is in urgent need, mechanical cooling (axial flow fan blows air at the gear 44) can be used. Take the temperature of the top surface and the shaft shoulder section surface of the gear 44 measured by an infrared thermometer gun being equivalent to the room temperature as the standard for cooling in place.

[0163] S8. Inspect and store in the warehouse, which specifically includes the following steps:

[0164] S81. Complete the cleaning, including cleaning the operation site, hydraulic tooling, recycling of tools, etc.;

[0165] S82. Inspect. According to the drawings, inspect the relevant parameters of the assembled rolling mill. After filling with lubricating grease, hang a sign and store it in the warehouse or use it on the machine.

[0166] According to the above processes and steps, the assembly method of a rolling mill device for a seamless steel tube cold rolling mill provided by the present invention is completed. New parts are used to assemble the rolling mill device offline, realizing efficient, fast, and precise offline assembly processing operations of each component of the rolling mill, meeting the requirements for the assembly and commissioning of the rolling mill device of two-roll periodic seamless steel tube cold rolling mills of various models.

[0167] The present invention is applicable to the precision assembly operation of the roll device of a two-high periodic seamless steel tube cold rolling mill with a finished rolling specification of more than φ15mm, and is particularly applicable to the off-line assembly and processing of the roll device for cold rolling seamless steel tubes of high-strength steel grades such as nickel-based alloys, super austenitic and duplex stainless steels.

[0168] Example 1

[0169] A steel pipe factory of a certain iron and steel company uses the technology provided by the present invention on the SKW-75 and KPW-50 high-speed cold rolling mills imported from abroad on the seamless steel tube cold rolling production line, as well as on two-high periodic seamless steel tube cold rolling mills of models such as LG-220H, LG-150H, LG-110H, and LG-60H for the cold rolling production (deformation processing) of seamless steel tubes of high-strength steel grades such as nickel-based alloys, super austenitic and duplex stainless steels.

[0170] Taking the LG-220H two-high periodic seamless steel tube cold rolling mill with a finished rolling specification of φ150 - 220mm as an example, and the roll device with a finished product specification of φ208*12mm for new product assembly (the diameter of the roll gear section = 330mm, the model of the roll rolling bearing is 24172CCK / W33 / C2, the inner diameter of the bearing is 360mm, and the diameter of the roll ring pass section = 380mm), and the summer room temperature is 30°C. Its main processes include eight processes: operation preparation, gear disassembly, left bearing housing disassembly, right bearing housing disassembly, ring pass disassembly, and completion cleaning. That is:

[0171] S1, Assembly preparation, specifically including the following steps:

[0172] S11, Safety preparation: informing the operation items, safety technical disclosure, implementing on-site safety prevention measures, cleaning the on-site environment, etc.;

[0173] S12, Personnel preparation: verifying personnel qualifications and ensuring they hold certificates to work, etc.;

[0174] S13, Material preparation: receiving relevant components from the warehouse, cleaning, cleaning, wiping, deburring, and verifying and confirming relevant technical parameters with reference to the drawings, etc.;

[0175] S14, Tool preparation: implementing relevant tooling according to the operation items, such as electromagnetic heaters, jacks, manual hydraulic pumps, wrenches, feeler gauges, etc.

[0176] S2, Assembling the ring pass, specifically including the following steps:

[0177] S21, The journal of the gear section of the roll shaft is facing downwards and stands vertically;

[0178] S22, Install the positioning key, that is, install the rectangular positioning key directionally in the rectangular groove of the maximum outer diameter journal section of the roll shaft → fasten it with hexagon socket head cap screws, and if necessary, apply thread fixing agent to the threaded section;

[0179] S23. Place the ring-hole type positioning keyway facing down and horizontally on a special circular support. The distance from the bottom of the ring-hole type to the ground (i.e., the height of the support) shall be not less than 300 mm.

[0180] S24. Use a lifting machine (crane) to vertically hoist the electromagnetic heating coil (select an electromagnetic heating coil with an inner hole specification of 600 mm) → vertically and directionally fit it over the ring-hole type that has been horizontally placed on the ring-shaped support → after the inner hole of the electromagnetic heating coil fits flush with the outer cylindrical surface of the ring-hole type, insert the four plug plates at the bottom of the electromagnetic heating coil → slightly lower the hook of the lifting machine, and the steel wire rope is in a loose working condition. The electromagnetic heating coil is supported by the ring-shaped support.

[0181] S25. Connect the power supply → energize and heat → use an infrared temperature measuring gun to measure the heating temperature (the heating temperature of the ring-hole type is 320 °C) → observe the states of the ring-hole type and the electromagnetic heating coil at all times → the expansion equivalent is approximately the product of the inner diameter value of the ring-hole type, the coefficient of thermal expansion, and the actual heating temperature difference, and is proportional to the absolute temperature difference value between the inner diameter of the ring-hole type and the working position after heating.

[0182] S26. Assembly of the ring-hole type by the temperature difference method: The ring-hole type expands when heated (the coefficient of thermal expansion is 0.012 mm / m.°C). The maximum expansion equivalent of the inner hole of the ring-hole type = 0.012 mm / m.°C × 380 mm × (320 °C - 30 °C) = 1.3224 mm, that is, the inner diameter of the ring-hole type after heating expansion = 1.3224 + 380 = 381.32 mm → measure the inner diameter of the ring-hole type after heating expansion (the measured value) with an internal diameter caliper = 380.90 mm → compare the inner diameter of the ring-hole type after expansion with the diameter of the ring-hole type shaft neck section of the roll shaft. The expansion equivalent is 0.90 mm, which meets the requirement that the inner diameter should be at least 0.30 - 0.50 mm larger than the outer diameter of the shaft neck → the lifting machine vertically lifts the electromagnetic heating coil and synchronously drives the heated ring-hole type to move to the upper space of the vertical roll shaft → align the inner hole of the ring-hole type with the roll shaft, and lower the hook of the lifting machine → after the rectangular keyway at the bottom of the ring-hole type aligns with the positioning key, gradually lower the electromagnetic heating coil until the bottom of the ring-hole type fits with the roll shaft shoulder (at the same time, the positioning key fits and encloses with the rectangular keyway) → the lifting machine pauses for 20 minutes until the ring-hole type and the roll shaft are fully enclosed (interference fit) → remove the four plug plates at the bottom of the electromagnetic heating coil → lift the hook of the lifting machine, place the electromagnetic heating coil in a special working position → remove the sling of the electromagnetic heating coil from the lifting machine.

[0183] S27. Cooling: Usually, natural cooling is adopted overnight. When the surface temperatures of the top, bottom, rolling groove of the ring-hole type, and the shaft neck surfaces of the bearing section and gear section of the roll shaft measured by an infrared temperature measuring gun are equivalent to the room temperature of 30 °C, it is regarded as the standard for cooling in place.

[0184] S3. Install the right bearing housing, including the following steps:

[0185] S31, Install the second isolation ring: Orient and install the second isolation ring 2 on the roll shaft, with its bottom end face flush with the end face of the ring hole type;

[0186] S32, Install the second through cover: Orient and install the second through cover with the convex step surface facing upward on the roll shaft. The inner hole of the second through cover encloses the second isolation ring, and its bottom end face is flush with the end face of the ring hole type;

[0187] S33, Pre-assemble the rolling bearing: Orient and install the tapered bore short cylindrical roller self-aligning bearing in the inner cylindrical hole of the bearing housing with the small diameter section of the tapered bore facing upward (ensure the cleanliness of the roll shaft surface and the inner hole surface of the bearing during installation, and spray clean lubricating oil if necessary); The installation method can adopt the temperature difference method, i.e., heating the bearing as a whole; or the hammering method, using a copper hammer to strike the end face of the inner ring of the bearing; Generally speaking, from the perspective of ensuring assembly accuracy, the temperature difference method is selected;

[0188] S34, Check the bearing installation accuracy: Use a feeler gauge to measure the distance D1 between the bottom end face of the bearing and the top end face of the second isolation ring, which is 1.60 mm, meeting the interval value of 1.0 - 2.0 mm;

[0189] S35, Install the bearing housing: Install the bearing housing by the temperature difference method → Heat the bearing housing as a whole (the heating temperature of the oil cylinder is 320 °C) → Use a lifting machine (install a lifting ear at the end face threaded hole) to orient and install the bearing housing on the tapered bore short cylindrical roller self-aligning bearing, with the bottom end face of the bearing housing flush with the bottom end face of the outer ring of the bearing;

[0190] S36, Cooling: Adopt mechanical cooling (use an axial flow fan to blow air at the bearing housing) for 2 hours, and measure the temperatures of the top end face, bottom end face of the tapered bore short cylindrical roller self-aligning bearing and the outer surface of the bearing housing with an infrared thermometer gun to be 30 °C, which is equivalent to the room temperature.

[0191] S4, Bearing accuracy adjustment, specifically including the following steps:

[0192] S41, Install the adjustment tooling: Displace the entire roll device into the rectangular support → Install a support seat on the top end face of the roll, and the stepped shaft shoulder of the support seat is flush with the top end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing installed on the roll;

[0193] S42, Install the hydraulic appliances: Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular support and the upper plane of the support seat on the top of the roll;

[0194] S43. Adjust the working clearance of the bearing: Start the manual hydraulic pump → The jack piston extends upward → Restrained by the crossbeam of the rectangular bracket → Under the action of the reaction force, the support seat presses down, transmitting the downward pressure to the inner ring of the spherical roller bearing with tapered bore (the output pressure of the manual hydraulic pump is 20 MPa) → The inner ring of the bearing moves downward → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance value between the rolling elements of the bearing and the outer ring according to three equal parts → Record the parameters, L1 = 0.05 mm, L2 = 0.08 mm, L3 = 0.06 mm, that is, the measured and corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.05 + 0.08 + 0.06) / 3 ≈ 0.06 mm;

[0195] S44. Confirm the working clearance value: For the spherical roller bearing with tapered bore 24172CCK / W33 / C2, refer to the calculation model, and recheck with the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.06 mm, which meets the technical requirements of the working clearance in the cold rolling of the roll;

[0196] S45. Judgment of the bearing working clearance: The measured working clearance L = 0.06 mm, which meets the range of L = 0.02 - 0.10 mm and is close to the upper limit, so it is judged that the working clearance is qualified.

[0197] S46. Remove the hydraulic tooling and take out tools such as the jack and the support seat.

[0198] S47. Reconfirm the installation accuracy of the bearing: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the spherical roller bearing with tapered bore with qualified working clearance and the end face of the second spacer ring. D1 = 0.90 mm, which meets the standard of 0.2 - 1.0 mm.

[0199] S48. Install the through cover and the end cover: Move the roll out of the rectangular bracket station, use hexagon bolts to fix the gland in the threaded hole at the end of the roll shaft → Use the method of pressing strip flanging to prevent loosening → Use fastening screws to fix the second through cover on the bottom end face of the bearing housing, with a washer to prevent loosening → When installing the second through cover, the convex step on the inner side of the through cover fits flush with the end face of the inner ring of the bearing (the bearing housing and the outer ring of the bearing are displaced due to the axial pressure of the screwed fastening, so as to achieve the flushness of the inner ring and the through cover) → Use fastening screws and washers to fix the end cover on the outer side end face of the bearing housing.

[0200] S5. Install the left bearing housing, which specifically includes the following steps:

[0201] S51. Flip the roll: Use a lifting machine to flip the roll 180 degrees, with the end of the assembled bearing housing facing downwards, and the end cover of the bearing housing fitting flush with the ground of the station;

[0202] S52. Install the first spacer ring: Install the first spacer ring on the roll shaft directionally, with the bottom end face fitting flush with the end face of the ring hole type;

[0203] S53, Install the first transparent cover: Place the raised stepped surface inside the first transparent cover facing upwards and install it directionally on the roll shaft. The inner hole of the first transparent cover accommodates the first spacer ring, and the bottom end face fits flush with the ring hole type end face;

[0204] S54, Pre-assemble the rolling bearing: Install the tapered bore short cylindrical roller self-aligning bearing with the small diameter section of the tapered bore facing upwards directionally in the inner cylindrical hole of the bearing housing (ensure the cleanliness of the roll shaft surface and the inner hole surface of the bearing during installation, and spray clean lubricating oil if necessary); The installation method can adopt the temperature difference method, that is, heat the bearing as a whole; or the hammering method, use a copper hammer to strike the end face of the inner ring of the bearing; Generally speaking, from the perspective of ensuring assembly accuracy, the temperature difference method is selected;

[0205] S55, Check the bearing installation accuracy: Use a feeler gauge to measure the distance value D2 between the lower end face of the bearing and the upper end face of the first spacer ring, D2 = 1.3 mm, which meets the standard of 1.0 - 2.0 mm;

[0206] S56, Install the bearing housing: Install the bearing housing by the temperature difference method → Heat the bearing housing as a whole (the heating temperature of the oil cylinder is 320 °C) → Use a lifting machine (install a lifting ear at the end face threaded hole) to install the bearing housing directionally on the tapered bore short cylindrical roller self-aligning bearing, and the bottom end face of the bearing housing is flush with the bottom end face of the outer ring of the bearing.

[0207] S57, Cooling: Use mechanical cooling (an axial flow fan blows air towards the bearing housing) for 2 hours, and measure the temperature of the top end face, bottom end face of the tapered bore short cylindrical roller self-aligning bearing and the outer surface of the bearing housing with an infrared thermometer gun to be 30 °C, which is equivalent to the room temperature.

[0208] S6, Bearing accuracy adjustment, specifically including the following steps:

[0209] S61, Install the adjustment tooling: Displace the entire roll device into the rectangular bracket → Install a transition sleeve directionally on the roll shaft, and the bottom end face of the transition sleeve fits flush with the top end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing installed on the roll → Install a support seat on the top end face of the roll, and the stepped shaft shoulder of the support seat fits flush with the top end face of the transition sleeve;

[0210] S62, Install the hydraulic appliances: Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll;

[0211] S63. Adjust the working clearance of the bearing: Start the manual hydraulic pump → The jack piston extends upward → Restrained by the crossbeam of the rectangular bracket → Under the action of the reaction force, the support seat presses down, and the downward pressure is transmitted to the inner ring of the spherical roller bearing with tapered bore through the transition sleeve (the output pressure of the manual hydraulic pump is preferably 20 MPa) → The inner ring of the bearing moves downward → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance between the rolling elements and the outer ring of the bearing according to three equal parts → Record the parameters, L1 = 0.06 mm, L2 = 0.08 mm, L3 = 0.07 mm, that is, the measured corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.06 + 0.08 + 0.07) / 3 ≈ 0.07 mm;

[0212] S64. Confirm the working clearance value: For the spherical roller bearing with tapered bore 24172CCK / W33 / C2, refer to the calculation model, and recheck with the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.07 mm, which meets the technical requirements of the working clearance in the cold rolling of the roll.

[0213] S65. Judgment of the bearing working clearance: The measured working clearance L = 0.07 mm, which meets the range of L = 0.02 - 0.10 mm and is close to the upper limit, so the working clearance is judged to be qualified.

[0214] S66. Remove the hydraulic tooling and take out tools such as the jack and the support seat.

[0215] S67. Reconfirm the installation accuracy of the bearing: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the spherical roller bearing with tapered bore with qualified working clearance and the end face of the spacer ring 1. D1 = 0.70 mm, which meets the standard of 0.2 - 1.0 mm.

[0216] S68. Install the through cover and the end cover: Move the roll out of the rectangular bracket station, use hexagon bolts to fix the gland in the threaded hole at the end of the roll shaft → Use the method of pressing strip flanging to prevent loosening → Use fastening screws to fix the first through cover on the bottom end face of the bearing seat, and use washers to prevent loosening → When installing the first through cover, the convex step on the inner side of the through cover fits flush with the end face of the inner ring of the bearing (the bearing seat and the outer ring of the bearing are displaced by the axial pressure of the screw fastening, so as to achieve the flush of the inner ring and the through cover) → Use fastening screws and washers to fix the end cover on the outer side end face of the bearing seat.

[0217] S7. Install the gear, which specifically includes the following steps:

[0218] S71. Install the flat key: Install the flat key directionally in the rectangular groove of the roll shaft;

[0219] S72. Install the first spacer ring: Align the rectangular groove in the inner hole of the first spacer ring with the flat key on the roll shaft, and then install it on the roll shaft directionally. During installation, ensure the cleanliness of the contact surface (cylindrical surface) between the spacer ring and the roll shaft, and make the bottom end face of the first spacer ring fit flush with the top end face of the inner ring of the spherical roller bearing with tapered bore;

[0220] S73. Install the gear: Heat the end gear as a whole to 320°C by the temperature difference method → Install the heated end gear as a whole on the roll shaft directionally with the gear section facing up → Make the bottom end face of the gear flush with the top end face of the first spacer ring;

[0221] S74. Install the tapered sleeve: Install the gear tapered sleeve in the conical ring formed by the combination of the roll shaft and the end gear with the large-diameter tapered hole facing down directionally. During installation, ensure the cleanliness of the surface of the roll shaft, the inner hole surface of the end gear, and the inner and outer surfaces of the gear tapered sleeve. If necessary, spray clean lubricating oil → Use a copper hammer or a combination of a hammer and a copper bar to strike the top end face of the tapered sleeve, and press the tapered sleeve down successively;

[0222] S75. Position the tapered sleeve: Move the roll into the special working position → Install the pressure plate and the support seat on the top of the roll shaft and the end gear. Make the end face of the pressure plate fit flush with the top end face of the gear tapered sleeve → Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll → Start the manual hydraulic pump → The piston of the jack extends upward → Restricted by the cross beam of the rectangular bracket → Under the action of the reaction force, the support seat presses down, and the downward pressure is transmitted to the end face of the gear tapered sleeve through the pressure plate, displacing the tapered sleeve downward until the tapered hole of the tapered sleeve completely fits and encloses the conical surface of the roll shaft → The gear tapered sleeve expands slightly due to the downward pressure of the tapered hole → Completely encloses and fits with the end gear after heating and expansion

[0223] S76. Install the end cover: Fix the gear end cover in the threaded hole on the end face of the roll shaft with fastening screws and washers;

[0224] S77. Cool down: Use mechanical cooling (axial flow fan blows air at the end gear) for 2 hours. Measure the temperature of the top surface of the gear and the surface of the shaft shoulder section with an infrared thermometer gun to be 320°C, which is equivalent to the room temperature.

[0225] S8. Inspection and warehousing, which specifically includes the following steps:

[0226] S81. Final cleaning, including: cleaning the operation site, hydraulic tooling, recycling of tools, etc.;

[0227] S82. Inspection: Inspect the relevant parameters of the assembled roll device according to the drawings. After filling with lubricating grease, hang a label and store it in the warehouse or use it on the machine.

[0228] Embodiment 2

[0229] Taking the LG-150H two-high periodic seamless steel tube cold rolling mill with rolled finished product specifications of φ110 - 150mm as an example, and taking the roll device with a finished product specification of φ110 * 7.5mm for new product assembly (the diameter of the roll gear section = 280mm, the model of the roll rolling bearing is 24160CCK / W33 / C2, the inner diameter of the bearing is 300mm, the diameter of the roll ring pass section = 320mm), and the summer room temperature is 30°C. Its main processes include eight processes such as operation preparation, gear disassembly, left bearing housing disassembly, right bearing housing disassembly, ring pass disassembly, and completion cleaning. That is:

[0230] S1, Assembly preparation, specifically including the following steps:

[0231] S11, Safety preparation: informing the operation items, safety technical disclosure, implementing on-site safety prevention measures, cleaning the on-site environment, etc.;

[0232] S12, Personnel preparation: verifying personnel qualifications and ensuring they hold certificates to work, etc.;

[0233] S13, Material preparation: receiving relevant components from the warehouse, cleaning, cleaning, wiping, deburring, and verifying and confirming relevant technical parameters with reference to the drawings, etc.;

[0234] S14, Tool preparation: implementing relevant tooling according to the operation items, such as electromagnetic heaters, jacks, manual hydraulic pumps, wrenches, feeler gauges, etc.

[0235] S2, Assembling the ring pass, specifically including the following steps:

[0236] S21, Place the roll shaft gear section with the journal facing down vertically;

[0237] S22, Install the positioning key, that is, install the rectangular positioning key directionally in the rectangular groove of the maximum outer diameter journal section of the roll shaft → fasten it with an internal hexagon screw, and if necessary, apply thread fixing agent on the threaded section;

[0238] S23, Place the ring pass positioning keyway facing down and horizontally on the special circular support, and the distance from the bottom of the ring pass to the ground (i.e., the height of the support) is not less than 300mm;

[0239] S24, Use a hoisting machine (crane) to vertically lift the electromagnetic heating coil (select an electromagnetic heating coil with an inner hole specification of 600mm) → vertically and directionally sleeve it on the ring pass that has been horizontally placed on the annular support → after the inner hole of the electromagnetic heating coil fits flush with the outer cylindrical surface of the ring pass, insert the four plug boards at the bottom of the electromagnetic heating coil → slightly lower the crane hook, the steel wire rope is in a loose condition, and the electromagnetic heating coil is supported by the annular support;

[0240] S25, Connect the power supply → power on and heat → use an infrared thermometer to measure the heating temperature (the heating temperature of the ring hole type is 320 °C) → observe the states of the ring hole type and the electromagnetic heating coil at all times → the expansion equivalent is approximately the product of the inner diameter value of the ring hole type, the coefficient of thermal expansion, and the actual heating temperature difference, and is proportional to the absolute temperature difference value between the inner diameter of the ring hole type and the working station after heating;

[0241] S26, Oriented assembly of the ring hole type by temperature difference method: The ring hole type expands when heated (the coefficient of thermal expansion is 0.012 mm / m.°C), and the maximum expansion equivalent of the inner hole of the hole type = 0.012 mm / m.°C × 320 mm × (320 °C - 30 °C) = 1.044 mm, that is, the inner diameter of the ring hole type after heating expansion = 1.044 + 320 = 321.05 mm → Use an internal diameter caliper to measure the inner diameter of the ring hole type after heating expansion (measured value) = 320.70 mm → Compare the inner diameter of the ring hole type after expansion with the diameter of the journal section of the roll shaft ring hole type. The expansion equivalent is 0.70 mm, which meets the requirement that the inner diameter should be at least 0.30 - 0.50 mm larger than the outer diameter of the journal → The hoisting machinery vertically lifts the electromagnetic heating coil and synchronously drives the heated ring hole type to move to the upper space of the vertical roll shaft → Align the inner hole of the ring hole type with the roll shaft, and the hoisting machinery hook descends → After the rectangular keyway at the bottom of the ring hole type is aligned with the positioning key, gradually lower the electromagnetic heating coil until the bottom of the ring hole type fits against the roll shaft shoulder (at the same time, the positioning key and the rectangular keyway fit and contain) → The hoisting machinery pauses for 20 minutes until the ring hole type and the roll shaft are fully contained (interference fit) → Withdraw the four plug plates at the bottom of the electromagnetic heating coil → Lift the hoisting machinery hook and place the electromagnetic heating coil in a dedicated working station → The hoisting machinery removes the sling of the electromagnetic heating coil.

[0242] S27, Cooling: Usually, natural cooling is adopted for one night shift. When the surface temperatures of the top surface, bottom surface, rolling groove of the ring hole type, and the journal surfaces of the bearing section and gear section of the roll shaft measured by an infrared thermometer are equivalent to the room temperature of 30 °C, it is regarded as the standard for cooling in place.

[0243] S3, Install the right bearing seat, including the following steps:

[0244] S31, Install the second spacer ring: Orient and install the second spacer ring on the roll shaft, with the bottom end face flush with the end face of the ring hole type;

[0245] S32, Install the second through cover: Orient and install the second through cover on the roll shaft with the convex step surface facing up. The inner hole of the second through cover contains the second spacer ring, and the bottom end face is flush with the end face of the ring hole type;

[0246] S33, Pre-assembly of rolling bearing: Install the spherical roller bearing with tapered bore and short cylindrical rollers in the inner cylindrical hole of the bearing housing with the small-diameter section of the tapered bore facing upwards (ensure the cleanliness of the surface of the roll shaft and the inner bore of the bearing during installation, and spray clean lubricating oil if necessary); the installation method can adopt the temperature difference method, that is, heating the bearing as a whole; or the hammering method, using a copper hammer to strike the end face of the inner ring of the bearing; generally speaking, from the perspective of ensuring assembly accuracy, the temperature difference method is selected.

[0247] S34, Check the installation accuracy of the bearing: Use a feeler gauge to measure the distance D1 = 1.40 mm between the lower end face of the bearing and the upper end face of the second spacer ring, which meets the interval value of 1.0 - 2.0 mm.

[0248] S35, Install the bearing housing: Install the bearing housing by the temperature difference method → Heat the bearing housing as a whole (the heating temperature of the oil cylinder is 320 °C) → Use a lifting machine (install a lifting ear at the end face threaded hole) to install the bearing housing on the spherical roller bearing with tapered bore and short cylindrical rollers in a directional manner, and the bottom end face of the bearing housing is flush with the bottom end face of the outer ring of the bearing.

[0249] S36, Cooling: Adopt mechanical cooling (use an axial flow fan to blow air towards the bearing housing) for 2 hours, and measure the temperatures of the top end face, bottom end face of the spherical roller bearing with tapered bore and short cylindrical rollers and the outer surface of the bearing housing with an infrared thermometer gun to be 30 °C, which is equivalent to the room temperature.

[0250] S4, Bearing accuracy adjustment, specifically including the following steps:

[0251] S401, Install the adjustment tooling: Displace the roll device as a whole into the rectangular bracket → Install a support seat on the top end face of the roll, and the stepped shoulder of the support seat fits flush with the top end face of the inner ring of the spherical roller bearing with tapered bore and short cylindrical rollers installed on the roll.

[0252] S402, Install the hydraulic appliances: Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll.

[0253] S403, Adjust the working clearance of the bearing: Start the manual hydraulic pump → The piston of the jack extends upwards → Restricted by the cross beam of the rectangular bracket → Under the action of the reaction force, the support seat presses downwards, transmitting the downward pressure to the inner ring of the spherical roller bearing with tapered bore and short cylindrical rollers (the output pressure of the manual hydraulic pump is 20 MPa) → The inner ring of the bearing moves downwards → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance value between the rolling elements of the bearing and the outer ring according to three equal parts → Record the parameters, L1 = 0.08 mm, L2 = 0.06 mm, L3 = 0.08 mm, that is, the measured and corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.05 + 0.06 + 0.05) / 3 ≈ 0.07 mm.

[0254] S404, Confirm the working clearance value: For the 24160CCK / W33 / C2 tapered bore short cylindrical roller self-aligning bearing, refer to the calculation model, and recheck with the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.07 mm, which meets the technical requirements of the working clearance in the cold rolling of rolls for tube making.

[0255] S405, Judgment of the bearing working clearance: The measured working clearance L = 0.07 mm, which is within the range of L = 0.02 - 0.10 mm and is close to the upper limit, so the working clearance is judged to be qualified.

[0256] S406, Remove the hydraulic tooling and take out tools such as the jack and the support seat.

[0257] S407, Reconfirm the bearing installation accuracy: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing with qualified working clearance and the end face of the spacer ring 2. D1 = 1.10 mm, which does not meet the standard of 0.5 - 1.0 mm.

[0258] S408, Install the hydraulic tooling again → Start the manual hydraulic pump → The piston of the jack extends upward → Constrained by the crossbeam of the rectangular support → Acting with the reaction force, the support seat presses down, transmitting the downward pressure to the inner ring of the tapered bore short cylindrical roller self-aligning bearing (the output pressure of the manual hydraulic pump is 28 MPa) → The inner ring of the bearing moves downward → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance value between the rolling elements of the bearing and the outer ring according to three equal parts → Record the parameters, L1 = 0.06 mm, L2 = 0.05 mm, L3 = 0.05 mm, that is, the measured and corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.06 + 0.05 + 0.05) / 3 ≈ 0.05 mm;

[0259] S409, Confirm the working clearance value: For the 24160CCK / W33 / C2 tapered bore short cylindrical roller self-aligning bearing, refer to the calculation model, and take the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.05 mm, which meets the technical requirements of the working clearance in the cold rolling of rolls for tube making.

[0260] S410, Judgment of the bearing working clearance: The measured working clearance L = 0.05 mm, which is within the range of L = 0.02 - 0.10 mm and is close to the upper limit, so the working clearance is judged to be qualified.

[0261] S411, Remove the hydraulic tooling and take out tools such as the jack and the support seat.

[0262] S412, Reconfirm the bearing installation accuracy: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing with qualified working clearance and the end face of the spacer ring 2. D1 = 0.9 mm, which meets the standard of 0.2 - 1.0 mm.

[0263] S413, Install the transparent cover and the end cover: Move the roller out of the rectangular support station, fix the gland in the threaded hole at the end of the roller shaft with hexagon bolts → Use the method of pressing strip flanging to prevent loosening → Fix the second transparent cover on the bottom end face of the bearing housing with fastening screws, and use washers to prevent loosening → When installing the second transparent cover, the convex step on the inner side of the transparent cover fits flush with the end face of the inner ring of the bearing (the bearing housing and the outer ring of the bearing are displaced due to the axial pressure of the screw fastening, so as to achieve the flushness of the inner ring and the transparent cover) → Fix the end cover on the outer side end face of the bearing housing with fastening screws and washers.

[0264] S5, Install the left bearing housing, which specifically includes the following steps:

[0265] S51, Roll the roller over: Use a lifting machine to roll the roller 180 degrees, with the end of the assembled bearing housing facing down, and the end cover of the bearing housing fitting with the ground of the station.

[0266] S52, Install the first spacer ring: Install the first spacer ring on the roller shaft directionally, with the bottom end face fitting flush with the ring hole type end face.

[0267] S53, Install the first transparent cover: Place the convex step surface of the first transparent cover facing up and install it on the roller shaft directionally. The inner hole of the first transparent cover contains the first spacer ring, and the bottom end face fits flush with the ring hole type end face.

[0268] S54, Pre-assemble the rolling bearing: Install the tapered bore short cylindrical roller self-aligning bearing in the inner cylindrical hole of the bearing housing with the small diameter section of the tapered bore facing up (ensure the cleanliness of the surface of the roller shaft and the inner hole of the bearing during installation, and spray clean lubricating oil if necessary); The installation method can adopt the temperature difference method, that is, heat the bearing as a whole; or the hammering method, use a copper hammer to strike the end face of the inner ring of the bearing; Generally speaking, from the perspective of ensuring assembly accuracy, the temperature difference method is selected.

[0269] S55, Check the installation accuracy of the bearing: Use a feeler gauge to measure the distance value D2 between the lower end face of the bearing and the upper end face of the first spacer ring, D2 = 1.1 mm, which meets the standard of 1.0 - 2.0 mm.

[0270] S56, Install the bearing housing: Install the bearing housing by the temperature difference method → Heat the bearing housing as a whole (the heating temperature of the oil cylinder is 320 °C) → Use a lifting machine (install a lifting lug on the end face threaded hole) to install the bearing housing on the tapered bore short cylindrical roller self-aligning bearing directionally, with the bottom end face of the bearing housing flush with the bottom end face of the outer ring of the bearing.

[0271] S57, Cooling: Use mechanical cooling (align an axial flow fan to blow on the bearing housing) for 2 hours, and measure the temperature of the top end face, bottom end face of the tapered bore short cylindrical roller self-aligning bearing and the outer surface of the bearing housing with an infrared temperature gun to be 30 °C, which is equivalent to the room temperature, as the standard for cooling in place.

[0272] S6. Bearing precision adjustment, specifically including the following steps:

[0273] S61. Install the adjustment tooling: Displace the entire roll device into the rectangular bracket → Orientally install a transition sleeve on the roll shaft, and the bottom end face of the transition sleeve fits flush with the top end face of the inner ring of the tapered bore cylindrical roller self-aligning bearing installed on the roll → Install a support seat on the top end face of the roll, and the stepped shoulder of the support seat fits flush with the top end face of the transition sleeve;

[0274] S62. Install the hydraulic appliances: Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll;

[0275] S63. Adjust the working clearance of the bearing: Start the manual hydraulic pump → The piston of the jack extends upward → Restrained by the crossbeam of the rectangular bracket → Under the action of the reaction force, the support seat is pressed down, and the downward pressure is transmitted to the inner ring of the tapered bore cylindrical roller self-aligning bearing through the transition sleeve (the output pressure of the manual hydraulic pump is preferably 20 MPa) → The inner ring of the bearing moves downward → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance value between the rolling elements of the bearing and the outer ring according to three equal parts → Record the parameters, L1 = 0.04 mm, L2 = 0.06 mm, L3 = 0.06 mm, that is, the measured and corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.04 + 0.06 + 0.06) / 3 ≈ 0.05 mm;

[0276] S64. Confirm the working clearance value: For the 24160CCK / W33 / C2 tapered bore cylindrical roller self-aligning bearing, refer to the calculation model, and recheck with the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.05 mm, which meets the technical requirements of the working clearance in roll cold rolling of pipes;

[0277] S65. Judgment of the bearing working clearance: The measured working clearance L = 0.05 mm, which meets the range of L = 0.02 - 0.10 mm and is close to the upper limit, so it is judged that the working clearance is qualified.

[0278] S66. Remove the hydraulic tooling and take out tools such as the jack and support seat.

[0279] S67. Reconfirm the installation precision of the bearing: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the tapered bore cylindrical roller self-aligning bearing with qualified working clearance and the end face of the spacer ring 1. D1 = 0.40 mm, which meets the standard of 0.2 - 1.0 mm.

[0280] S68, Install the transparent cover and the end cover: Move the roller out of the rectangular support station, fix the gland in the threaded hole at the end of the roller shaft with hexagon bolts → Use the method of pressing strip flanging to prevent loosening → Fix the first transparent cover on the bottom end face of the bearing seat with fastening screws, and use washers to prevent loosening → When installing the first transparent cover, the convex step on the inner side of the transparent cover fits flush with the end face of the bearing inner ring (the bearing seat and the bearing outer ring are displaced due to the axial pressure of the screwed fastening, so as to achieve the flushness of the inner ring and the transparent cover) → Fix the end cover on the outer side end face of the bearing seat with fastening screws and washers.

[0281] S7, Install the gear, which specifically includes the following steps:

[0282] S71, Install the flat key: Install the flat key directionally in the rectangular groove of the roller shaft;

[0283] S72, Install the first spacer ring: After aligning the rectangular groove in the inner hole of the first spacer ring with the flat key on the roller shaft, install it directionally on the roller shaft. When installing, it is necessary to ensure the cleanliness of the contact surface (cylindrical surface) between the spacer ring and the roller shaft, and the bottom end face of the first spacer ring fits flush with the top end face of the inner ring of the tapered bore cylindrical roller self-aligning bearing;

[0284] S73, Install the gear: Heat the end gear as a whole to 320°C by the temperature difference method → Install the heated end gear as a whole with the gear section facing up directionally on the roller shaft → The bottom end face of the gear is flush with the top end face of the first spacer ring;

[0285] S74, Install the taper sleeve: Install the gear taper sleeve with the large-diameter tapered hole facing down directionally in the tapered ring formed by the combination of the roller shaft and the end gear. When installing, it is necessary to ensure the cleanliness of the surface of the roller shaft, the inner hole surface of the end gear, and the inner and outer surfaces of the gear taper sleeve. If necessary, clean lubricating oil can be sprayed → Use a copper hammer or a combination of a hammer and a copper bar to strike the top end face of the taper sleeve, and press the taper sleeve down successively;

[0286] S75, Taper sleeve positioning: Move the roller into the special station → Install the pressure plate and the support seat on the top of the roller shaft and the end gear. The end face of the pressure plate fits flush with the top end face of the gear taper sleeve → Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roller shaft) → Install the jack between the top beam of the rectangular support and the upper plane of the support seat on the top of the roller → Start the manual hydraulic pump → The piston of the jack extends upward → Restricted by the cross beam of the rectangular support → Under the action of the reaction force, the support seat is pressed down, and the downward pressure is transmitted to the end face of the gear taper sleeve through the pressure plate, displacing the taper sleeve downward until the tapered hole of the taper sleeve completely fits and encloses the tapered surface of the roller shaft → The gear taper sleeve expands slightly due to the downward pressure of the tapered hole → Completely encloses and fits with the heated and expanded end gear

[0287] S76, Install the end cover: Fix the gear end cover in the threaded hole at the end of the roller shaft with fastening screws and washers;

[0288] S77, Cooling: Adopt mechanical cooling (axial flow fan blows air at the end gear) for 2 hours. The temperature of the top surface of the gear and the surface of the shaft shoulder section measured by an infrared temperature gun is 320 °C, which is equivalent to the room temperature.

[0289] S8, Inspection and warehousing, specifically including the following steps:

[0290] S81, Completion cleaning, including: cleaning the operation site, hydraulic tooling, recycling of tools, etc.;

[0291] S82, Inspection: Conduct relevant parameter inspections on the assembled roll device according to the drawings. After adding lubricating grease, hang a label and store it in the warehouse or use it on the machine.

[0292] Example 3

[0293] Take the LG-110H two-high periodic seamless steel tube cold rolling mill with a rolled product specification of φ76 - 110 mm as an example, and the newly assembled roll device with a finished product specification of φ90 * 6.5 mm (the diameter of the roll gear section = 230 mm, the model of the roll rolling bearing is 24148CCK / W33 / C2, the inner diameter of the bearing is 240 mm, the diameter of the roll ring pass section = 260 mm), and the room temperature in summer is 30 °C. Its main processes include eight processes: operation preparation, gear disassembly, left bearing housing disassembly, right bearing housing disassembly, ring pass disassembly, completion cleaning, etc. That is:

[0294] S1, Assembly preparation, specifically including the following steps:

[0295] S11, Safety preparation: Informing of operation items, safety technical disclosure, implementation of on-site safety prevention measures, cleaning of the operation site environment, etc.;

[0296] S12, Personnel preparation: Verification of personnel qualifications and working with certificates, etc.;

[0297] S13, Material preparation: Collecting relevant spare parts from the warehouse, cleaning, cleaning, wiping, deburring, and verifying and confirming relevant technical parameters with reference to the drawings;

[0298] S14, Tool preparation: Implementing relevant tooling according to the operation items, such as electromagnetic heaters, jacks, manual hydraulic pumps, wrenches, feeler gauges, etc.

[0299] S2, Assembly of the ring pass, specifically including the following steps:

[0300] S21, Place the roll shaft gear section with the shaft neck facing down and stand it vertically;

[0301] S22, Install the positioning key, that is, install the rectangular positioning key directionally in the rectangular groove of the maximum outer diameter shaft neck section of the roll shaft → Fasten it with an internal hexagon screw, and if necessary, apply thread fixing agent to the threaded section;

[0302] S23. Place the ring-hole type positioning keyway downward and horizontally on a special circular support. The distance from the bottom of the ring-hole type to the ground (i.e., the height of the support) shall be not less than 300 mm.

[0303] S24. Use a hoisting machine (crane) to vertically lift the electromagnetic heating coil (select an electromagnetic heating coil with an inner hole specification of 600 mm) → vertically and directionally sleeved on the ring-hole type that has been horizontally placed on the annular support → after the inner hole of the electromagnetic heating coil fits flush with the outer cylindrical surface of the ring-hole type, insert the four plug plates at the bottom of the electromagnetic heating coil → slightly lower the hook of the hoisting machine, and the steel wire rope is in a loose working condition. The electromagnetic heating coil is supported by the annular support.

[0304] S25. Connect the power supply → turn on the heating → use an infrared temperature measuring gun to measure the heating temperature (the heating temperature of the ring-hole type is 320 °C) → observe the states of the ring-hole type and the electromagnetic heating coil at all times → the expansion equivalent is approximately the product of the inner diameter value of the ring-hole type, the coefficient of thermal expansion, and the actual heating temperature difference, and is proportional to the absolute temperature difference value between the inner diameter of the ring-hole type and the working position after heating.

[0305] S26. Assembly of the ring-hole type by temperature difference method: The ring-hole type expands when heated (the coefficient of thermal expansion is 0.012 mm / m·°C). The maximum expansion equivalent of the inner hole of the ring-hole type = 0.012 mm / m·°C × 240 mm × (320 °C - 30 °C) = 0.8352 mm, that is, the inner diameter of the ring-hole type after heating expansion = 0.8352 + 240 = 240.84 mm → use an internal diameter caliper to measure the inner diameter of the ring-hole type after heating expansion (measured value) = 240.60 mm → compare the inner diameter of the ring-hole type after expansion with the diameter of the ring-hole type shaft neck section of the roll shaft. The expansion equivalent is 0.60 mm, which meets the requirement that the inner diameter should be at least 0.30 - 0.50 mm larger than the outer diameter of the shaft neck → the hoisting machine vertically lifts the electromagnetic heating coil and synchronously drives the ring-hole type after heating to move to the upper space of the vertical roll shaft → the inner hole of the ring-hole type aligns with the roll shaft, and the hook of the hoisting machine descends → after the rectangular keyway at the bottom of the ring-hole type aligns with the positioning key, gradually lower the electromagnetic heating coil until the bottom of the ring-hole type fits with the roll shaft shoulder (at the same time, the positioning key fits and is contained in the rectangular keyway) → the hoisting machine pauses for 20 minutes until the ring-hole type and the roll shaft are fully contained (interference fit) → remove the four plug plates at the bottom of the electromagnetic heating coil → lift the hook of the hoisting machine and place the electromagnetic heating coil preferably at the special working position → the hoisting machine removes the sling of the electromagnetic heating coil.

[0306] S27. Cooling: Usually, natural cooling is adopted for one shift. Use an infrared temperature measuring gun to measure that the surface temperatures of the top surface, bottom surface, rolling groove of the ring-hole type, and the bearing section and gear section shaft neck surface of the roll shaft are equivalent to the room temperature of 30 °C as the standard for cooling in place.

[0307] S3. Install the right bearing housing, which specifically includes the following steps:

[0308] S31, Install the second isolation ring: Orient and install the second isolation ring on the roll shaft, with its bottom end face flush with the end face of the ring hole pattern.

[0309] S32, Install the second through cover: Orient the raised step face inside the second through cover upwards and install it on the roll shaft. The inner hole of the second through cover encloses the second isolation ring, and its bottom end face is flush with the end face of the ring hole pattern.

[0310] S33, Pre-assemble the rolling bearing: Install the tapered bore short cylindrical roller self-aligning bearing in the cylindrical hole of the bearing housing with the small diameter section of the tapered bore facing upwards (ensure the cleanliness of the roll shaft surface and the inner hole surface of the bearing during installation, and spray clean lubricating oil if necessary); The installation method can adopt the temperature difference method, i.e., heating the bearing as a whole; or the hammering method, using a copper hammer to strike the end face of the inner ring of the bearing; Generally speaking, from the perspective of ensuring assembly accuracy, the temperature difference method is selected.

[0311] S34, Check the bearing installation accuracy: Use a feeler gauge to measure the distance D1 between the bottom end face of the bearing and the upper end face of the second isolation ring, which is 1.20 mm, meeting the interval value of 1.0 - 2.0 mm.

[0312] S35, Install the bearing housing: Install the bearing housing by the temperature difference method → Heat the bearing housing as a whole (the heating temperature of the oil cylinder is 320 °C) → Use a lifting machine (install lifting lugs at the end face threaded holes) to orient and install the bearing housing on the tapered bore short cylindrical roller self-aligning bearing, with the bottom end face of the bearing housing flush with the bottom end face of the outer ring of the bearing.

[0313] S36, Cooling: Adopt mechanical cooling (use an axial flow fan to blow air at the bearing housing) for 2 hours, and measure the temperature of the top end face, bottom end face of the tapered bore short cylindrical roller self-aligning bearing and the outer surface of the bearing housing with an infrared thermometer gun to be 30 °C, which is equivalent to the room temperature.

[0314] S4, Bearing accuracy adjustment, specifically including the following steps:

[0315] S41, Install the adjustment tooling: Displace the entire roll device into the rectangular bracket → Install a support seat on the top end face of the roll, and the step shoulder of the support seat is flush with the top end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing installed on the roll.

[0316] S42, Install the hydraulic appliances: Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll.

[0317] S43. Adjust the working clearance of the bearing: Start the manual hydraulic pump → The jack piston extends upward → Restricted by the crossbeam of the rectangular bracket → Under the action of the reaction force, the support seat is pressed down, and the downward pressure is transmitted to the inner ring of the spherical roller bearing with tapered bore (the output pressure of the manual hydraulic pump is 20 MPa) → The inner ring of the bearing moves downward → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance value between the rolling elements of the bearing and the outer ring according to three equal parts → Record the parameters, L1 = 0.05 mm, L2 = 0.06 mm, L3 = 0.06 mm, that is, the measured corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.05 + 0.06 + 0.06) / 3 ≈ 0.06 mm;

[0318] S44. Confirm the working clearance value: For the spherical roller bearing with tapered bore 24148CCK / W33 / C2, refer to the calculation model, and recheck with the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.06 mm, which meets the technical requirements of the working clearance in the cold rolling of the roll.

[0319] S45. Judgment of the bearing working clearance: The measured working clearance L = 0.06 mm, which meets the range of L = 0.02 - 0.10 mm and is close to the upper limit, so the working clearance is judged to be qualified.

[0320] S46. Remove the hydraulic tooling and take out tools such as the jack and the support seat.

[0321] S47. Reconfirm the installation accuracy of the bearing: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the spherical roller bearing with tapered bore with qualified working clearance and the end face of the second spacer ring. D1 = 0.60 mm, which meets the standard of 0.2 - 1.0 mm.

[0322] S48. Install the through cover and the end cover: Move the roll out of the rectangular bracket station, use hexagon bolts to fix the gland in the threaded hole at the end of the roll shaft → Use the method of pressing strip flanging to prevent loosening → Use fastening screws to fix the second through cover on the bottom end face of the bearing housing, with a washer to prevent loosening → When installing the second through cover, the convex step on the inner side of the through cover fits flush with the end face of the inner ring of the bearing (the bearing housing and the outer ring of the bearing are displaced due to the axial pressure of the screw fastening, so as to achieve the flushness of the inner ring and the through cover) → Use fastening screws and washers to fix the end cover on the outer side end face of the bearing housing.

[0323] S5. Install the left bearing housing, which specifically includes the following steps:

[0324] S51. Flip the roll: Use a lifting machine to flip the roll 180 degrees, with the end of the assembled bearing housing facing down, and the end cover of the bearing housing fitting with the ground of the station;

[0325] S52. Install the first spacer ring: Install the first spacer ring on the roll shaft directionally, with the bottom end face fitting flush with the end face of the ring hole type;

[0326] S53, Install the first transparent cover: Place the raised stepped surface inside the first transparent cover facing upwards and install it on the roll shaft in a directional manner. The inner hole of the first transparent cover encloses the first isolation ring, and the bottom end face fits flush with the end face of the ring hole type.

[0327] S54, Pre-assemble the rolling bearing: Install the spherical roller bearing with tapered bore and short cylindrical rollers in the inner cylindrical hole of the bearing housing with the small-diameter section of the tapered bore facing upwards (ensure the cleanliness of the surface of the roll shaft and the inner hole surface of the bearing during installation, and spray clean lubricating oil if necessary); The installation method can adopt the temperature difference method, that is, heat the bearing as a whole; or the hammering method, use a copper hammer to strike the end face of the inner ring of the bearing; Generally speaking, from the perspective of ensuring assembly accuracy, the temperature difference method is selected.

[0328] S55, Check the bearing installation accuracy: Use a feeler gauge to measure the distance value D2 between the lower end face of the bearing and the upper end face of the first isolation ring, D2 = 1.1 mm, which meets the standard of 1.0 - 2.0 mm.

[0329] S56, Install the bearing housing: Install the bearing housing by the temperature difference method → Heat the bearing housing as a whole (the heating temperature of the oil cylinder is 320 °C) → Use a lifting machine (install a lifting ear at the end face threaded hole) to install the bearing housing on the spherical roller bearing with tapered bore and short cylindrical rollers in a directional manner, and the bottom end face of the bearing housing is flush with the bottom end face of the outer ring of the bearing.

[0330] S57, Cooling: Use mechanical cooling (aim an axial flow fan at the bearing housing to blow air) for 2 hours, and measure the temperature of the top end face, bottom end face of the spherical roller bearing with tapered bore and short cylindrical rollers and the outer surface of the bearing housing with an infrared thermometer gun to be 30 °C, which is equivalent to the room temperature.

[0331] S6, Bearing accuracy adjustment, specifically including the following steps:

[0332] S61, Install the adjustment tooling: Displace the entire roll device into the rectangular bracket → Install a transition sleeve on the roll shaft in a directional manner, and the bottom end face of the transition sleeve fits flush with the top end face of the inner ring of the spherical roller bearing with tapered bore and short cylindrical rollers installed on the roll → Install a support seat on the top end face of the roll, and the stepped shoulder of the support seat fits flush with the top end face of the transition sleeve.

[0333] S62, Install the hydraulic appliances: Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll.

[0334] S63. Adjust the working clearance of the bearing: Start the manual hydraulic pump → The jack piston extends upward → Restricted by the crossbeam of the rectangular bracket → Under the action of the reaction force, the support seat presses down, and the downward pressure is transmitted to the inner ring of the spherical roller bearing with tapered bore through the transition sleeve (the output pressure of the manual hydraulic pump is preferably 20 MPa) → The inner ring of the bearing moves downward → The inner ring of the bearing expands slightly due to the action of the tapered bore → Use a feeler gauge to measure the clearance between the rolling elements of the bearing and the outer ring according to three equal parts → Record the parameters, L1 = 0.06 mm, L2 = 0.05 mm, L3 = 0.08 mm, that is, the measured corrected working clearance value L = (L1 + L2 + L3) / 3 = (0.06 + 0.05 + 0.08) / 3 ≈ 0.06 mm;

[0335] S64. Confirm the working clearance value: For the spherical roller bearing with tapered bore 24172CCK / W33 / C2, refer to the calculation model, and recheck with the working clearance value L = 0.02 - 0.10 mm as the judgment standard. L = 0.06 mm, which meets the technical requirements of the working clearance in the cold rolling of the roll.

[0336] S65. Judgment of the bearing working clearance: The measured working clearance L = 0.06 mm, which meets the range of L = 0.02 - 0.10 mm and is close to the upper limit, so it is judged that the working clearance is qualified.

[0337] S66. Remove the hydraulic tooling and take out tools such as the jack and the support seat.

[0338] S67. Reconfirm the installation accuracy of the bearing: Use a feeler gauge to measure the distance D1 between the end face of the inner ring of the spherical roller bearing with tapered bore with qualified working clearance and the end face of the spacer ring 1. D1 = 0.40 mm, which meets the standard of 0.2 - 1.0 mm.

[0339] S68. Install the through cover and the end cover: Move the roll out of the rectangular bracket station, use hexagon bolts to fix the gland in the threaded hole at the end of the roll shaft → Use the method of pressing strip flanging to prevent loosening → Use fastening screws to fix the first through cover on the bottom end face of the bearing housing, with a washer to prevent loosening → When installing the first through cover, the convex step on the inner side of the through cover fits flush with the end face of the inner ring of the bearing (the bearing housing and the outer ring of the bearing are displaced by the axial pressure of the screw fastening, so as to achieve the flush of the inner ring and the through cover) → Use fastening screws and washers to fix the end cover on the outer side end face of the bearing housing.

[0340] S7. Install the gear, which specifically includes the following steps:

[0341] S71. Install the flat key: Install the flat key directionally in the rectangular groove of the roll shaft;

[0342] S72. Install the first spacer ring: Align the rectangular groove in the inner hole of the first spacer ring with the flat key on the roll shaft, and then install it on the roll shaft directionally. During installation, ensure the cleanliness of the contact surface (cylindrical surface) between the spacer ring and the roll shaft, and make the bottom end face of the first spacer ring fit flush with the top end face of the inner ring of the spherical roller bearing with tapered bore;

[0343] S73. Install the gear: Heat the end gear as a whole to 320°C by the temperature difference method → Install the heated end gear as a whole on the roll shaft directionally with the gear section facing up → Make the bottom end face of the gear flush with the top end face of the first spacer ring;

[0344] S74. Install the taper bushing: Install the gear taper bushing in the conical ring formed by the combination of the roll shaft and the end gear with the large-diameter tapered hole facing down. During installation, ensure the cleanliness of the surface of the roll shaft, the inner hole surface of the end gear, and the inner and outer surfaces of the gear taper bushing. If necessary, spray clean lubricating oil → Use a copper hammer or a combination of a hammer and a copper bar to strike the top end face of the taper bushing and press the taper bushing down successively;

[0345] S75. Taper bushing positioning: Move the roll into the special working position → Install the pressure plate and the support seat on the top of the roll shaft and the end gear. Make the end face of the pressure plate fit flush with the top end face of the gear taper bushing → Install the P392 hydraulic pump → Install and connect the high-pressure oil pipe (one end is connected and fixed to the hydraulic pump body, and the other end is connected and fixed to the jack on the end face of the roll shaft) → Install the jack between the top beam of the rectangular bracket and the upper plane of the support seat on the top of the roll → Start the manual hydraulic pump → The piston of the jack extends upward → Restrained by the cross beam of the rectangular bracket → Under the action of the reaction force, the support seat is pressed down, and the downward pressure is transmitted to the end face of the gear taper bushing through the pressure plate, displacing the taper bushing downward until the tapered hole of the taper bushing completely fits and encloses the conical surface of the roll shaft → The gear taper bushing expands slightly due to the downward pressure of the tapered hole → Completely encloses and fits with the end gear after heating and expansion;

[0346] S76. Install the end cover: Fix the gear end cover in the threaded hole on the end face of the roll shaft with fastening screws and washers;

[0347] S77. Cooling: Use natural cooling for one night shift. Measure the temperatures of the top surface of the gear and the surface of the shaft shoulder section with an infrared thermometer gun to be 320°C, which is equivalent to the room temperature.

[0348] S8. Inspection and warehousing, which specifically includes the following steps:

[0349] S81. Completion cleaning, including: cleaning the operation site, hydraulic tooling, recycling of tools, etc.;

[0350] S82. Inspection: Inspect the relevant parameters of the assembled roll device according to the drawings. After filling with lubricating grease, hang a label and store it in the warehouse or use it on the machine.

[0351] Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as it is within the scope of the spirit of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. An assembly method for a roll device of a seamless steel tube cold rolling mill, characterized in that, It includes the following steps: S1, Assembly preparation; S2, Assemble the ring hole type; S3, Install the right bearing housing; S4, Adjust the assembly accuracy of the right bearing; S5, Install the left bearing housing; S6, Adjust the assembly accuracy of the left bearing; S7, Install the gear; S8, Inspect and store in warehouse.

2. The assembly method for the roll device of a seamless steel tube cold rolling mill according to claim 1, characterized in that, The assembly preparation in step S1 specifically includes the following steps: S11, Safety preparation, including job item notification, safety technical disclosure, implementation of on-site safety prevention measures, and cleaning of the on-site environment; S12, Personnel preparation, including verification of personnel qualifications and working with certificates; S13, Material preparation, including collecting relevant parts from the warehouse, cleaning, clearing, wiping, deburring, and verifying and confirming relevant technical parameters with reference to the drawings; S14, Tool preparation, implementing relevant tooling according to the job item.

3. The assembling method for the roll device of the seamless steel tube cold rolling mill according to claim 1, characterized in that, The assembly of the ring hole type in step S2 specifically includes the following steps: S21, Place the journal of the roller shaft gear section of the roller downward and stand it vertically; S22, Install the positioning key, directionally install the positioning key in the rectangular groove on the journal of the roller shaft gear section of the roller, and fasten it with an internal hexagon screw; S23, Place the ring hole type with the positioning key groove downward and horizontally on a special circular support, and the bottom of the ring hole type is not less than 300 mm from the ground; S24, Use a lifting device to vertically hoist the electromagnetic heating coil, vertically and directionally sleeved the electromagnetic heating coil on the ring hole type, after the inner ring of the electromagnetic heating coil fits flush with the outer cylindrical surface of the ring hole type, insert the bottom plug board of the electromagnetic heating coil, and then the lifting device descends, so that the electromagnetic heating coil is supported by the annular support; S25, Connect the power supply to heat, use an infrared temperature measuring gun to measure the heating temperature, and observe the states of the ring hole type and the electromagnetic heating coil in real time; S26, Assemble the ring hole type directionally by the temperature difference method; S27, Cool by natural cooling method.

4. The assembly method for the roll device of a seamless steel tube cold rolling mill according to claim 3, characterized in that, Observing the states of the ring hole type and the electromagnetic heating coil in step S25 specifically means: The expansion equivalent is the product of the inner diameter value of the ring hole type, the coefficient of thermal expansion, and the actual heating temperature difference, and is proportional to the absolute temperature difference between the inner diameter of the ring hole type and the working station after heating.

5. The assembly method for the roll device of a seamless steel tube cold rolling mill according to claim 3, characterized in that, The installation of the right bearing housing in step S3 specifically includes the following steps: S31, Install the second spacer ring, directionally install the second spacer ring on the roller shaft of the roller, and the bottom end face of the second spacer ring fits flush with the end face of the ring hole type; S32, Install the second through cover, with the inner convex step face of the second through cover facing upward, directionally install it on the roller shaft of the roller, the inner hole of the second through cover contains the second spacer ring, and the bottom end face of the second through cover fits flush with the end face of the ring hole type; S33, Pre-assemble the rolling bearing, and install the short cylindrical roller self-aligning bearing with tapered bore with the small diameter section of the tapered bore facing upward in the inner cylindrical hole of the bearing housing; S34, Use a feeler gauge to check the installation accuracy of the bearing; S35, Install the right bearing housing by the temperature difference method; S36, Cool by natural cooling method.

6. The assembling method for the roll device of the seamless steel tube cold rolling mill according to claim 5, characterized in that, The adjustment of the assembly accuracy of the right bearing in step S4 specifically includes the following steps: S41. Install the adjustment tooling, displace the whole roll into the rectangular bracket, install a support seat on the top end face of the roll, and make the stepped shaft shoulder of the support seat fit flush with the top end face of the inner ring of the tapered bore short cylindrical roller self-aligning bearing; S42. Install the hydraulic appliance; S43. Use the hydraulic appliance to adjust the working clearance of the bearing; S44. Confirm the working clearance value, and take the working clearance value L = 0.02 - 0.10 mm as the judgment standard; S45. Judge the working clearance of the bearing. If the actually measured working clearance value L is less than 0.02 mm, it means the working clearance is too small and the bearing needs to be replaced and reinstalled. If the working clearance value L is greater than 0.10 mm, it means the working clearance is too large and the inner ring needs to be pressed down again for adjustment, but the downward pressure shall not exceed the output pressure value of the hydraulic appliance corresponding to the bearing of this specification model. If the working clearance value L is still greater than the standard value range, the bearing needs to be disassembled and the second spacer ring needs to be replaced; S46. Remove the hydraulic appliance; S47. Use a feeler gauge to detect and confirm the installation accuracy of the bearing again; S48. Install the second through cover and the second end cover.

7. The assembly method for the roll device of a seamless steel tube cold rolling mill according to claim 6, wherein, The specific steps for installing the left bearing seat in step S5 are as follows: S51. Flip the roll, use the lifting equipment to flip the roll by 180°, and make the end with the right bearing seat installed face down; S52. Install the first spacer ring, install the first spacer ring on the roll shaft directionally, and make the bottom end face of the first spacer ring fit flush with the end face of the ring hole type; S53. Install the first through cover, make the inner raised step face of the first through cover face up, install it on the roll shaft directionally, make the inner hole of the first through cover contain the first spacer ring, and make the bottom end face of the first through cover fit flush with the end face of the ring hole type; S54. Pre-assemble the rolling bearing, and install the tapered bore short cylindrical roller self-aligning bearing in the inner cylindrical hole of the bearing seat with the small diameter section of the tapered bore facing up directionally; S55. Use a feeler gauge to check the installation accuracy of the bearing; S56. Install the left bearing seat by the temperature difference method; S57. Cool it by the natural cooling method.

8. The assembling method for the roll device of a seamless steel tube cold rolling mill according to claim 7, characterized in that, The specific steps for adjusting the assembly accuracy of the left bearing in step S6 are as follows: S61. Install the adjustment tooling, displace the whole roll into the rectangular bracket, install a transition sleeve on the roll directionally, make the bottom end face of the transition sleeve fit flush with the top end face of the tapered bore short cylindrical roller self-aligning bearing, install a support seat on the top end face of the roll, and make the stepped shaft shoulder of the support seat fit flush with the top end face of the transition sleeve; S62. Install the hydraulic appliance; S63. Use the hydraulic appliance to adjust the working clearance of the bearing; S64. Confirm the working clearance value, and take the working clearance value L = 0.02 - 0.10 mm as the judgment standard; S65. Determine the working clearance of the bearing. If the measured working clearance value L is less than 0.02 mm, it indicates that the working clearance is too small and the bearing needs to be replaced and reinstalled. If the working clearance value L is greater than 0.10 mm, it indicates that the working clearance is too large and the inner ring needs to be pressed down again for adjustment, but the pressing force shall not exceed the output pressure value of the hydraulic appliance corresponding to the bearing of this specification model. If the working clearance value L is still greater than the standard value range, the bearing needs to be disassembled and the first spacer ring needs to be replaced. S66. Remove the hydraulic appliance. S67. Use a feeler gauge to re-check and confirm the installation accuracy of the bearing. S68. Install the first through cover and the first end cover.

9. The assembly method for the roll device of a seamless steel tube cold rolling mill according to claim 8, characterized in that, The installation of the gear in step S7 specifically includes the following steps: S71. Install the flat key and orientally install the flat key in the rectangular groove of the roller shaft of the roller. S72. Install the first spacing ring. After aligning the inner hole rectangular groove of the first spacing ring with the flat key, orientally install it on the roller shaft of the roller. S73. Install the gear. Use the differential temperature method to install the gear on the roller shaft of the roller, and the bottom end face of the gear is flush with the top end face of the first spacing ring. S74. Install the gear cone sleeve and orientally install the large-diameter conical hole of the gear cone sleeve downward in the conical ring formed by the roller shaft of the roller and the gear. S75. Position the gear cone sleeve. S76. Fasten the gear end cover to the end face of the roller shaft of the roller. S77. Cool it by natural cooling.

10. The assembly method for the roll device of a seamless steel tube cold rolling mill according to claim 9, characterized in that, The inspection and warehousing in step S8 specifically includes the following steps: S81. Finish cleaning, including cleaning the operation site, hydraulic tooling, and recycling of tools. S82. Inspect. Check the relevant parameters of the assembled roller according to the drawing. After filling with lubricating grease, hang a label and store it in the warehouse or use it on the machine.

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