A method for correcting motion accuracy of a seamless steel tube cold rolling mill overrunning clutch

Abstract

The application discloses a seamless steel pipe cold rolling mill overrunning clutch motion precision correction method, which comprises the following steps: operation preparation of the overrunning clutch; determination and diameter correction confirmation of the roller installation space parameters; roller matching processing; and reset debugging of the overrunning clutch. The seamless steel pipe cold rolling mill overrunning clutch motion precision correction method is practical and efficient, convenient to measure, time and labor saving, and accurate in value. The height between the upper and lower cut points and the roller diameter are verified with each other, the technical requirements of the motion precision can be met, the working conditions of the effective combination of the overrunning clutch during the cold rolling pipe manufacturing are ensured, the equipment function precision construction is promoted, and the operation stability is good.

Description

Technical Field

[0001] This invention relates to the field of cold rolling equipment technology, and more specifically, to a method for correcting the motion accuracy of an overrunning clutch in a seamless steel pipe cold rolling mill. Background Technology

[0002] Seamless steel pipes are common metallurgical products. Currently, cold rolling is the main method for cold deformation processing of seamless steel pipes. Two-roll cold rolling mills are the primary production equipment for this process. Typically, a two-roll cold rolling mill consists of a feed and rotary mechanism, a rolling mechanism, a transmission mechanism, a rotary chuck mechanism, a bed mechanism, a feeding / unloading mechanism, a lubrication mechanism, a hydraulic mechanism, and an electrical control system. For the feed and rotary mechanism, its intermittent feed and rotary motions often employ an overrunning clutch as a torque transmission component, which is respectively located in the feed shaft system, the rotary shaft system, and the rocker arm shaft system. Overrunning clutches are transmission components that emerged with the development of power products. They are important components used for power transmission and separation between prime movers and working machines or between drive shafts and driven shafts within a machine. They are devices that utilize changes in the speed or rotation direction of the drive and driven parts to achieve self-engagement. Commonly used overrunning clutches have three structural forms: roller overrunning clutches, wedge-type overrunning clutches, and ratchet-type overrunning clutches. They respectively use rollers, wedges, and ratches as elements for transmitting torque. Currently, roller overrunning clutches are commonly used in two-roll periodic seamless steel pipe cold rolling mills.

[0003] Roller-type overrunning clutches are widely used in high-speed applications due to their uniform and stable transmission and large load-bearing capacity. They also meet the speed and load requirements of cold rolling of seamless steel pipes. Roller-type overrunning clutches can be divided into two types according to the position of their star wheel: outer star wheel and inner star wheel. Considering the ease of machining and machining accuracy of the conjugate surface of the clutch cylindrical hole, the inner star wheel overrunning clutch has a wider range of applications. The two-roll periodic seamless steel pipe cold rolling mill uses the inner star wheel, and the inner star wheel adopts a five-part shape.

[0004] Inner planetary roller type overrunning clutch, specifically as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, it includes an outer ring 7 and an inner ring, namely an inner star wheel 1, a spring ratchet, and rollers 2. There is one outer ring 7 and one inner ring 1. There are five spring ratchets and five rollers 2. The spring ratchet consists of a spring 3, a ratchet guide pin 8, a spring ratchet plate 9, a spring post 10, and a ratchet 4. The outer ring 7 is a hollow cylinder. The conjugate surface of the inner star wheel is machined with a wedge-shaped groove for mounting a wedge 5. The outer ring and the inner ring together form a concentric ring with different diameters. The rollers 2 are equidistantly mounted on the aforementioned ring. The outer side of the rollers 2 rests against the inner side of the outer ring, and the inner side of the rollers 2 is close to the middle area of ​​the wedge 5 on the conjugate surface of the inner ring (inner star wheel 1). The side of the rollers 2 in the direction of movement is close to the spring ratchet. The spring ratchet is inserted into the circular hole on the lateral vertical surface of the conjugate surface 6 of the inner ring (inner star wheel).

[0005] During seamless steel pipe rolling, the high-speed, low-torque operation is transmitted through the feed and rotary mechanism. This high speed is converted into low-speed, high-torque operation by the splined teeth of three star wheels in the feed shaft system, rotary shaft system, and rocker arm shaft system, driving the outer ring to achieve the same result. The working principle is as follows: when star wheel 1, installed in the shaft system, rotates clockwise relative to the outer ring... Figure 1 , Figure 3 , Figure 5 , Figure 7 and Figure 8 When the clutch rotates (in the direction of the arrow), roller 2, due to centrifugal force, presses against the end face of the star wheel spring ratchet plate in a clockwise direction. At this time, the entire clutch is engaged, meaning the roller is tangent to the inner arc surface of the outer ring, the upper plane of the wedge 5, and the end face of the ratchet plate. Figure 8 As shown in Figure a, this is also the initial position for roller installation; when star wheel 1 drives the outer ring to rotate, the clutch is in an overrunning state (the roller is separated from the outer ring or from the star wheel wedge, and there is a certain equivalent clearance value, i.e., clearance value B is not less than 1.0mm), thereby allowing power to disengage from the transmission. Figure 8 As shown in b, it can be seen that the key component of the entire overrunning clutch during seamless steel pipe rolling is roller 2. The state of roller 2 directly affects the accuracy and stability of the entire overrunning clutch and even the feed rotary mechanism. Roller 2 is a cylinder that has undergone heat treatment and tempering. When the overrunning clutch is working, roller 2 rotates under the drive of star wheel 1, converting friction into the rotational motion of the outer ring to achieve speed change and torque transmission. Therefore, the roller bears a large load and is prone to wear.

[0006] In production practice, after the overrunning clutch is used, its moving contact surfaces will experience wear, mainly roller diameter wear and out-of-roundness, star wheel wedge surface wear and grooving (inner arc groove), outer ring inner arc surface wear and irregular out-of-roundness, etc. After the aforementioned wear occurs, the initial position of roller 2 will shift in the opposite direction of movement (counterclockwise) or become stuck in the wedge groove. This will cause changes in the preload state of the roller and spring ratchet, and also cause abnormal changes in the three tangent points of roller 2 composed of the outer ring 7 of the overrunning clutch, star wheel wedge 5, and spring ratchet plate 9. This directly affects the motion accuracy of the overrunning clutch. In severe cases, it will cause the clutch to be unable to establish an engagement state and remain in a disengaged state, directly manifested as clutch slippage and inability to transmit torque.

[0007] Normally, when the aforementioned components of the overrunning clutch wear out, their operational accuracy can be restored by replacing the rollers and wedges. The outer ring is generally not replaced (due to the complex shaft structure and inconvenient replacement). Therefore, the rollers and wedges are the most vulnerable and replaceable parts in the entire overrunning clutch system. Due to factors such as replacement of the wedges and wear of the outer ring, the original motion parameters of the overrunning clutch change. Worn rollers cannot establish an effective engagement state. Even after replacing the rollers, due to outer ring wear, standard diameter rollers cannot effectively restore the engagement state. Even if all worn parts such as the outer ring, wedges, and rollers are replaced, due to tolerances and errors in machining, standard diameter rollers may exhibit an advanced or lagging installation position. However, the outer ring and wedges... The bolster is relatively fixed. Although the preload of the spring ratchet is adjustable, it will affect its service life and movement clearance. Therefore, only by adjusting the diameter of the rollers can the engagement state of the overrunning clutch be effectively met. The adjustment of the roller diameter is not something that can be done overnight. It must be done through actual measurement and matching to meet the technical requirements of the overrunning clutch movement accuracy. Especially when the outer ring is worn but not replaced, the wedge bolster has slight wear, and the groove depth is less than 0.10mm but not replaced, using rollers with a properly adjusted diameter can not only restore the function and accuracy of the overrunning clutch in time, but also reduce downtime and equipment maintenance costs. However, due to different wear equivalents, the roller diameter needs to be determined one by one, with one measurement and matching for each roller. Summary of the Invention

[0008] The purpose of this invention is to provide a method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill. This method addresses the technical improvements to the operation and maintenance of the overrunning clutch in the feed rotary mechanism of existing two-roll periodic seamless steel pipe cold rolling mills. It solves the technical problems of functional changes, stability alterations, and reduced accuracy of the overrunning clutch during use. The method is rationally designed, accurately calculated, precisely positioned, with compliant clearance, and is safe and reliable, effectively meeting the torque transmission function of the overrunning clutch under load conditions during seamless steel pipe rolling. Measurement is convenient, labor-saving, and time-saving, with accurate values. The height between the upper and lower tangent points and the roller diameter are mutually verified to meet motion accuracy requirements, ensuring effective engagement of the overrunning clutch during cold rolling. This promotes the improvement of equipment functional accuracy and operational stability, fundamentally enhancing the accuracy and stability of the overrunning clutch in the feed rotary mechanism, and meeting the needs of cold rolling high-alloy seamless steel pipes.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This invention provides a method for correcting the motion accuracy of an overrunning clutch in a seamless steel pipe cold rolling mill, comprising the following steps:

[0011] S1. Prepare the overrunning clutch for operation;

[0012] S2. Determination of roller mounting space parameters and confirmation of diameter correction;

[0013] S3. Machining for the fitting of rollers;

[0014] S4. Reset and adjust the overrunning clutch.

[0015] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S1 includes the following steps:

[0016] S11. Before starting work, take safety precautions and prepare materials and resources;

[0017] S12. Disassemble the overrunning clutch, create a cavity in the outer ring of the overrunning clutch, and clean it;

[0018] S13. Use standard measuring tools to measure the inner diameter of the outer ring, the flatness of the upper end face of the wedge, and the outer diameter of the roller;

[0019] S14. Based on the parameters measured in S13, determine and correct for scrapping.

[0020] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S14 includes the following steps:

[0021] S141. Discard criteria: Rollers with a diameter less than the standard value of 0.10mm, wedges with a flatness deviation of more than 0.10mm on the upper end face or with grooves on the end face and a groove depth greater than 0.10mm, and outer rings with an inner diameter greater than the standard value of 0.50mm or with grooves or edges greater than 0.10mm on the inner surface are all discarded.

[0022] S142. Correction: For wedges with a flatness deviation of less than 0.10mm on the upper end face or grooves with a groove depth of less than 0.10mm on the end face, grooves with an inner diameter less than 0.5mm of the standard value and an inner surface diameter of less than 0.10mm, and clutch outer rings with sharp edges, use a pneumatic grinding wheel for correction.

[0023] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S2 includes the following steps:

[0024] S21. Measurement of roller mounting space parameters;

[0025] S22. Confirmation of roller diameter correction.

[0026] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S21 includes the following steps:

[0027] S211. Assemble the modified star wheel onto the corresponding shaft system in a clockwise direction;

[0028] S212. Measurement of roller positioning points and roller positioning point height.

[0029] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S2 includes the following steps:

[0030] S221. Measure the standard parts of the rollers to determine whether the roller diameter needs to be corrected;

[0031] S222. Determine the corrected equivalent for the roller diameter.

[0032] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S221 includes the following steps:

[0033] S2211. The standard value of the distance L3 between the inner tangent point of the roller and the conjugate surface of the star wheel is in the range of 20.8-20.9mm. The roller diameter within this range does not need to be corrected.

[0034] S2212. The measured value of the distance L3 between the inner tangent point of the roller and the conjugate surface of the star wheel exceeds the range of 20.8-20.9mm and needs to be corrected.

[0035] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S222 includes the following steps:

[0036] S2221. When the measured value of L3 is greater than 20.9mm, the roller diameter D = standard part diameter d + (L3 - 20.9) / 2;

[0037] S2222. When the measured value of L3 is less than 20.8mm, the roller diameter D = standard part diameter d - (20.8 - L3) / 2.

[0038] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S3 includes the following steps:

[0039] S31. Determine the roller diameter based on the actual working conditions of the roller correction;

[0040] S32. Based on the determined diameter parameters, continuously process and manufacture several rollers.

[0041] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S4 includes the following steps:

[0042] S41. Install the rollers and use measuring tools to re-inspect the roller installation position;

[0043] S42. Reset the overrunning clutch and perform power-on testing.

[0044] By adopting the above technical solution, the present invention has the following advantages:

[0045] 1. This invention provides a method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill. This method is a technical improvement on the operation and maintenance of the overrunning clutch in the feed rotary mechanism of an existing two-roll periodic seamless steel pipe cold rolling mill. Based on the roller tangent point position, the distance between the star wheel conjugate surface and the wedge is used as the positioning point. The roller diameter is determined by a calculation model, which meets the technical requirements for the overrunning clutch motion clearance and accuracy. The design is reasonable, the calculation is accurate, the positioning is precise, the clearance is compliant, and it is safe and reliable. It effectively meets the torque transmission function of the overrunning clutch under the load condition during seamless steel pipe rolling.

[0046] 2. The overrunning clutch motion accuracy correction method of the seamless steel pipe cold rolling mill of the present invention is convenient to measure, saves labor and time, and provides accurate values. The height between the upper and lower tangent points and the roller diameter are mutually verified to meet the motion accuracy requirements, ensuring the effective engagement of the overrunning clutch during cold rolling of pipes. This promotes the construction of equipment functional accuracy, has good operational stability, and improves the accuracy and stability of the overrunning clutch used in the feed rotation mechanism from the source, meeting the needs of cold rolling of high alloy seamless steel pipes and enhancing the core competitiveness of enterprises in the market.

[0047] 3. The motion accuracy correction method for the overrunning clutch of the seamless steel pipe cold rolling mill of the present invention can meet both the requirements of online maintenance and repair of the overrunning clutch and the technical requirements of offline accuracy repair. It is practical and efficient. The motion clearance is reasonable, and the engagement and disengagement states are accurate and controllable, effectively reducing slippage and damage to the spring ratchet and star wheel, thus reducing equipment maintenance costs and playing a certain role in eliminating faults, reducing costs, and promoting production. It has strong versatility and has certain reference and application value for the technical improvement of on-site operation and maintenance of internal star wheel roller overrunning clutches in the mechanical manufacturing field. Attached Figure Description

[0048] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0049] Figure 1 This is a schematic diagram of the initial state structure of the overrunning clutch used in a seamless steel pipe cold rolling mill;

[0050] Figure 2 yes Figure 1 Schematic diagram of the structure along the AA direction;

[0051] Figure 3 This is a schematic diagram of the working structure of an overrunning clutch used in a seamless steel pipe cold rolling mill.

[0052] Figure 4 yes Figure 3 Schematic diagram of the structure along the AA direction;

[0053] Figure 5 This is a schematic diagram of the motion parameters of an overrunning clutch;

[0054] Figure 6 yes Figure 5 Schematic diagram of the structure along the AA direction;

[0055] Figure 7 This is a schematic diagram of motion parameters used in roller measurement;

[0056] Figure 8 This is a schematic diagram of the disassembled structure of the overrunning clutch in operation.

[0057] Figure 9 This is a flowchart of the overrunning clutch precision correction process. Detailed Implementation

[0058] The technical solution of the present invention will be specifically described below with reference to the accompanying drawings. The detailed features and advantages of the present invention are described in detail in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, those skilled in the art can easily understand the related objects and advantages of the present invention.

[0059] In steel pipe enterprises, various models of two-roll periodic cold rolling mills (such as LG-55, LG-80, LG-110H, etc.) are used to roll finished pipes with an outer diameter of 38mm or more.

[0060] This invention provides a method for correcting the motion accuracy of an overrunning clutch in a seamless steel pipe cold rolling mill, comprising the following steps as detailed below. Figure 9 As shown:

[0061] S1. Prepare the overrunning clutch for operation;

[0062] S2. Determination of installation space parameters for roller 2 and confirmation of diameter correction;

[0063] S3. Machining for the fitting of rollers;

[0064] S4. Reset and adjust the overrunning clutch.

[0065] S1 includes the following steps:

[0066] S11. Safety technical briefing and identification of hazardous factors before operation, implementation and inspection of on-site safety precautions, preparation of tools, equipment and materials, etc.

[0067] S12. Disassemble the overrunning clutch, form a cavity in the outer ring of the overrunning clutch and clean it. That is, open the overrunning clutch end cover of the feed rotary mechanism (gearbox), remove the inner star wheel 1 and components such as spring ratchet and roller 2 (i.e., form a cavity in the outer ring), and clean the inner surface of the cavity of the outer ring 7 of the overrunning clutch, the upper end face of the star wheel wedge, the outer cylindrical surface of the roller and other parts.

[0068] S13. Use standard measuring tools (micrometer, dial indicator, ruler, etc.) to measure parameters such as the inner diameter of the outer ring, the flatness of the upper end face of the wedge 5, and the outer diameter of the roller.

[0069] S14. Based on the parameters measured in S13, determine and correct for scrapping.

[0070] As one aspect of the method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill according to the present invention, S14 includes the following steps:

[0071] S141. Discarding criteria: Discard any rollers whose diameter is less than the standard value of 0.10mm, any wedge pillows whose upper end face flatness deviation is greater than 0.10mm or whose end face has grooves with a groove depth greater than 0.10mm, or any outer rings whose inner diameter is greater than the standard value of 0.50mm or whose inner surface has grooves or edges greater than 0.10mm.

[0072] S142. Correction: For wedges with a flatness deviation of less than 0.10 mm on the upper end face or grooves on the end face with a groove depth of less than 0.10 mm, for the outer ring of the clutch with grooves and edges with an inner diameter less than 0.5 mm of the standard value and an inner surface diameter less than 0.10 mm, use a pneumatic grinding wheel or similar tool to correct the contact surface so that it is smooth and without obvious unevenness.

[0073] S2 includes the following steps:

[0074] S21. Measurement of roller mounting space parameters;

[0075] S22. Confirmation of roller diameter correction.

[0076] S21 includes the following steps:

[0077] S211. Install the inner star wheel: Replace the wedge or correct the upper end face of the wedge and assemble the star wheel on the corresponding shaft in a clockwise direction and clean all contact surfaces.

[0078] S212. Measurement of roller positioning points and roller positioning point height is as follows: Figure 7 As shown: The roller positioning point measurement is to select any one of the five wedges 5 (usually the highest wedge is preferable). Starting from the inner edge of the upper end face of the star wheel wedge, the displacement is made outward. The displacement L2 should be 0.33-0.35 of the width of the upper end face of the wedge, i.e., L2 = (0.33-0.35) × L1, where L1 is the width of the upper end face of the wedge. This point is the tangent point between the roller and the wedge in the initial state (lower tangent point a of the roller). The roller positioning point height measurement is the vertical distance H between the upper and lower tangent points of the roller in the overrunning clutch. The upper tangent point b is the tangent point between the outer circle of the roller and the inner circle surface of the outer ring of the clutch. The lower tangent point a is the tangent point between the outer circle of the roller and the upper end face of the star wheel wedge. Theoretically, the distance between the upper tangent point a and the lower tangent point b can be used as the roller diameter D, D = H. However, in practice, it should be corrected according to the position L3 of the tangent point c (inner tangent point) between the roller and the spring ratchet plate.

[0079] S2 includes the following steps:

[0080] S221. Measure the standard parts of the rollers to determine whether the roller diameter needs to be corrected: Use a roller with a standard diameter d to be oriented and installed in the overrunning clutch, with the upper tangent point a and the lower tangent point b in place. Measure the value of the distance L3 between the inner tangent point position of the roller and the conjugate surface of the star wheel. Based on the measured value of L3, determine whether the roller diameter needs to be corrected.

[0081] S221 includes the following steps:

[0082] S2211. The standard value of the distance L3 between the inner tangent point of the roller and the conjugate surface of the star wheel is in the range of 20.8-20.9mm. The roller diameter within this range does not need to be corrected.

[0083] S2212. The measured value of the distance L3 between the inner tangent point of the roller and the conjugate surface of the star wheel exceeds the range of 20.8-20.9mm and needs to be corrected.

[0084] S222. Determine the corrected equivalent for the roller diameter.

[0085] S222 includes the following steps:

[0086] S2221. When the measured value of L3 is greater than 20.9mm, the roller diameter D = standard part diameter d + (L3 - 20.9) / 2;

[0087] S2222. When the measured value of L3 is less than 20.8mm, the roller diameter D = standard part diameter d - (20.8 - L3) / 2.

[0088] S3 includes the following steps:

[0089] S31. Determine the roller diameter: Based on the actual working conditions such as the correction equivalent or no correction required, determine the value of the roller diameter D, and this value cannot be greater than the height value H between the upper and lower tangent points;

[0090] S32. Matching Machining: Based on the determined parameters, use a centerless grinder to machine the outer diameter of the roller. The diameter tolerance should be ±0.02mm. Continuously machine and match 5 rollers.

[0091] S4 includes the following steps:

[0092] S41. Install the rollers. First, install the 5 sets of spring ratchets in the inner star wheel step hole. Then, install the 5 rollers one by one in the overrunning clutch. Use a measuring tool to measure the distance value L2 of the lower tangent point a and the distance value L3 of the inner tangent point c of the roller. It must meet the model requirements of L3 = 20.8-20.9mm and L2 = (0.33-0.35)×L1. Select the highest and lowest 2 points of the 5 wedges for re-inspection. If they do not meet the requirements, the relevant parameters need to be re-measured and the roller installation position needs to be re-inspected using a measuring tool.

[0093] S42. Reset the overrunning clutch and perform power-on debugging: After passing the re-inspection, the rollers are installed in the overrunning clutch end cover and other components. Power on the clutch for debugging, observe the movement of the overrunning clutch, and correct the speed through an external speed control belt to ensure that the torque output meets the requirements of cold-rolled tubes.

[0094] The above-described process steps complete the on-site application of the overrunning clutch motion accuracy correction method for seamless steel pipe cold rolling mills provided by this invention. For online use, all the above-described process steps can be installed. For offline use, the final power-on debugging step is omitted, and the remaining steps are executed. The corrected overrunning clutch torque transmission error value of the feed rotary mechanism is ≤1mm, which can meet the technical requirements for the cold rolling production of high-strength, deformation-resistant nickel-based alloys, high-temperature alloys, duplex stainless steel, and other high-alloy steel grades. The following detailed description of the overrunning clutch motion accuracy correction method of this invention is illustrated by examples:

[0095] Example 1

[0096] Taking the LG-110H two-roll periodic seamless steel pipe cold rolling mill with a finished product specification of φ76~110mm as an example, its standard roller diameter is d=30±0.02mm, clutch outer ring inner diameter is 270mm, wedge thickness is 13.4±0.05mm, and upper end face width is L1=60.7mm. The online precision correction operation of the feed shaft system overrunning clutch of its feed rotary mechanism is performed, namely:

[0097] I. Preparatory procedures for operating the overrunning clutch:

[0098] 1. Safety briefing and identification of hazards before operation, implementation and inspection of on-site safety precautions, preparation of tools, equipment and materials, etc.

[0099] 2. Open the external overrunning clutch end cover of the feed rotary mechanism (gearbox) and remove the inner star wheel, spring ratchet, rollers and other components (i.e., the outer ring forms a cavity).

[0100] 3. Clean the inner surface of the outer ring cavity of the overrunning clutch, the upper end face of the star wheel wedge, the outer cylindrical surface of the rollers, and other parts.

[0101] 4. The inner diameter of the outer ring is 270.1 mm after measurement using standard measuring tools (micrometer, dial indicator, ruler, etc.), the flatness of the upper end face of the wedge is 0.05 mm and there is no groove, and the outer diameter of the roller is 29.8 mm.

[0102] 5. Judgment: If the wear value of the outer ring inner diameter is less than 0.50mm, it can be used; if the wear value of the roller diameter is 30-29.8=0.20mm and is greater than 0.10mm, it should be discarded and replaced with a new product; if the wear deviation of the wedge pillow is less than 0.10mm, it can be used.

[0103] 6. Correction: Use a pneumatic grinding wheel to correct the inner surface of the clutch outer ring and the upper end face of the star wheel wedge, so that the contact surfaces are smooth and without obvious unevenness.

[0104] II. Measurement of roller installation space parameters and confirmation of roller diameter correction

[0105] Roller mounting space parameter measurement:

[0106] 1. Install the inner star wheel: After correcting the upper end face of the wedge, assemble the star wheel into the corresponding feed shaft in a clockwise direction, and clean all contact surfaces.

[0107] 2. Roller positioning point measurement: Take the highest point of the wedge as the measuring point position. Starting from the inner side of the upper end face of the star wheel wedge, the displacement is made to the outer side, L1 = 60.7mm. The displacement L2 should be 0.33 to 0.35 of the width of the upper end face of the wedge, that is, L2 = (0.33 to 0.35) × L1 = (0.33 to 0.35) × 60.7 = 20.03 to 20.25mm. Make sure that the lower cutting point a is within this area.

[0108] 3. Roller positioning point height measurement: This refers to the vertical distance H between the upper and lower tangent points of the rollers within the overrunning clutch. The actual measured H = 30.12 mm.

[0109] Roller diameter correction confirmed:

[0110] 1. Standard part measurement: A standard diameter roller with a diameter of d = 30 mm is installed in the overrunning clutch with the upper tangent point a and the lower tangent point b in place. The distance between the inner tangent point of the roller and the conjugate surface of the star wheel is measured to be L3 = 20.72 mm.

[0111] 2. Determine if the roller diameter needs to be corrected: According to L3 = 21.08 mm, if it is greater than 20.9 mm, it should be corrected.

[0112] 3. Correction of equivalent value: When the measured value of L3 is greater than 20.9mm, the roller diameter D = standard part diameter d + (L3 - 20.9) / 2 = 30 + (21.08 - 20.9) / 2 = 30.09mm ≈ 30.1mm.

[0113] III. Machining of Rollers

[0114] 1. Determine the roller diameter: Based on the corrected equivalent, the roller diameter D = 30.1 mm is determined, and D = 30.1 mm is less than the height value H = 30.12 mm between the upper and lower tangent points. The verification is qualified.

[0115] 2. Machining: Based on the determined parameter D = 30.1mm, the outer diameter of the roller is machined using a centerless grinder. The diameter tolerance should be ±0.02mm. Considering the actual wear and factors such as H = 30.12mm, the upper deviation is adopted for grinding, that is, the roller diameter D = 30.10~30.12mm. Five rollers are continuously machined and matched, and the actual measured roller diameter is 30.10mm.

[0116] IV. Reset and Adjustment

[0117] 1. Install rollers: First, install 5 sets of spring ratchets in the inner star wheel step hole, and then install the 5 matching rollers with a diameter of D=30.10mm one by one in the overrunning clutch.

[0118] 2. Re-inspection: Use measuring tools to measure the distance value L2 of the lower tangent point a of the roller and the distance value L3 of the inner tangent point c. The measured values ​​are L3 = 20.84 mm and L2 = 20.15 mm, which meet the model requirements of L3 = 20.8~20.9 mm and L2 = (0.33~0.35)×L1 = 20.03~20.25 mm. The two highest and lowest values ​​among the five wedges are selected for re-inspection, and the values ​​all meet the model requirements.

[0119] 3. Reset: After passing the re-inspection, install the overrunning clutch end cover and other components.

[0120] 4. Debugging: Power on and debug, observe the movement of the overrunning clutch, and correct the speed through the external speed control belt to ensure that the torque output meets the requirements of cold-rolled tube.

[0121] Example (II)

[0122] Taking the LG-80 two-roll periodic seamless steel pipe cold rolling mill with a finished product specification of φ57~80mm as an example, its standard roller diameter is d=29±0.02mm, clutch outer ring inner diameter is 260mm, wedge thickness is 13.4±0.05mm, and upper end face width is L1=60.7mm. Online precision correction is performed on the overrunning clutch of its feed rotary mechanism's rotating shaft system. That is:

[0123] I. Preparatory procedures for operating the overrunning clutch:

[0124] 1. Safety briefing and identification of hazards before operation, implementation and inspection of on-site safety precautions, preparation of tools, equipment and materials, etc.

[0125] 2. Open the external overrunning clutch end cover of the feed rotary mechanism (gearbox) and remove the inner star wheel, spring ratchet, rollers and other components (i.e., the outer ring forms a cavity).

[0126] 3. Clean the inner surface of the outer ring cavity of the overrunning clutch, the upper end face of the star wheel wedge, the outer cylindrical surface of the rollers, and other parts.

[0127] 4. The inner diameter of the outer ring is 260.1 mm after measurement using standard measuring tools (micrometer, dial indicator, ruler, etc.), the flatness of the upper end face of the wedge is 0.15 mm, and there is a groove. The deepest point of the inner arc groove is 0.10 mm, and the outer diameter of the roller is 28.75 mm.

[0128] 5. Judgment: If the wear value of the outer ring inner diameter is less than 0.50mm, it can be used; if the wear value of the roller diameter is 29-28.75=0.25mm and is greater than 0.10mm, it should be discarded and replaced; if the wear deviation of the wedge pillow is greater than 0.10mm and there is a groove with a depth greater than 0.10mm, it should be discarded and replaced with a new product.

[0129] 6. Correction: Use a pneumatic grinding wheel to correct the inner surface of the clutch outer ring, so that the contact surface is smooth and there are no obvious bumps. Replace 5 star wheel wedges and remove burrs.

[0130] II. Measurement of roller installation space parameters and confirmation of roller diameter correction

[0131] Roller mounting space parameter measurement:

[0132] 1. Install the inner star wheel: assemble the star wheel with the replaced wedge into the corresponding rotary shaft in a clockwise direction, and clean all contact surfaces.

[0133] 2. Roller positioning point measurement: Take the highest point of the wedge as the measuring point position. Starting from the inner side of the upper end face of the star wheel wedge, the displacement is made to the outer side, L1 = 60.7mm. The displacement L2 should be 0.33 to 0.35 of the width of the upper end face of the wedge, that is, L2 = (0.33 to 0.35) × L1 = (0.33 to 0.35) × 60.7 = 20.03 to 20.25mm. Make sure that the lower cutting point a is within this area.

[0134] 3. Roller positioning point height measurement: This refers to the vertical distance H between the upper and lower tangent points of the rollers within the overrunning clutch. The actual measured H = 29.05 mm.

[0135] Roller diameter correction confirmed:

[0136] 1. Standard part measurement: A standard diameter roller with a diameter of d = 29 mm is installed in the overrunning clutch with the upper tangent point a and the lower tangent point b in place. The distance between the inner tangent point of the roller and the conjugate surface of the star wheel is measured to be L3 = 20.85 mm.

[0137] 2. Determine if the roller diameter needs to be corrected: Based on L3 = 20.85mm, which is within the range of 20.8 to 20.9mm, no correction should be made. The height H should be used directly as the roller diameter D, i.e., D = H = 29.05mm.

[0138] III. Roller Fitting

[0139] 1. Determine the roller diameter: Based on the corrected equivalent, the roller diameter D = 29.05 mm, and D = H, which is not greater than 29.05 mm, so the verification is qualified.

[0140] 2. Machining: Based on the determined parameter D = 29.05mm, the outer diameter of the roller is machined using a centerless grinder. The diameter tolerance should be ±0.02mm. Considering the actual wear and factors such as H = 29.05mm, the grinding process adopts the lower deviation, that is, the roller diameter D = 29.03~29.05mm. Five rollers are continuously machined and matched, and the actual measured roller diameter is 29.04mm.

[0141] IV. Reset and Adjustment

[0142] 1. Install rollers: First, install 5 sets of spring ratchets in the inner star wheel step hole, and then install the 5 matching rollers with a diameter of D=29.04mm one by one in the overrunning clutch.

[0143] 2. Re-inspection: Use measuring tools to measure the distance value L2 of the lower tangent point a of the roller and the distance value L3 of the inner tangent point c. The measured values ​​are L3 = 20.88 mm and L2 = 20.10 mm, which meet the model requirements of L3 = 20.8~20.9 mm and L2 = (0.33~0.35)×L1 = 20.03~20.25 mm. Select the highest and lowest two wedges from the five wedges for re-inspection, and the values ​​all meet the model requirements.

[0144] 3. Reset: After passing the re-inspection, install the overrunning clutch end cover and other components.

[0145] 4. Debugging: Power on and debug, observe the movement of the overrunning clutch, and correct the speed through the external speed control belt to ensure that the torque output meets the requirements of cold-rolled tube.

[0146] Example (3)

[0147] Taking the LG-55 two-roll periodic seamless steel pipe cold rolling mill with a finished product specification of φ38~57mm as an example, its standard roller diameter is d=29±0.02mm, clutch outer ring inner diameter is 260mm, wedge thickness is 13.4±0.05mm, and upper end face width is L1=60.7mm. Offline precision correction is performed on the overrunning clutch of its feed rotation mechanism rocker arm shaft system. That is:

[0148] I. Preparatory procedures for operating the overrunning clutch:

[0149] 1. Safety briefing and identification of hazards before operation, implementation and inspection of on-site safety precautions, preparation of tools, equipment and materials, etc.

[0150] 2. Open the external overrunning clutch end cover of the feed rotary mechanism (gearbox) and remove the inner star wheel, spring ratchet, rollers and other components (i.e., the outer ring forms a cavity).

[0151] 3. Clean the inner surface of the outer ring cavity of the overrunning clutch, the upper end face of the star wheel wedge, the outer cylindrical surface of the rollers, and other parts.

[0152] 4. The inner diameter of the outer ring measured by standard measuring tools (micrometer, dial indicator, ruler, etc.) is 260.2mm and there are uneven edges. The flatness of the upper end face of the wedge is 0.15mm and there is a groove. The deepest point of the inner arc groove is 0.12mm and the outer diameter of the roller is 28.7mm.

[0153] 5. Judgment: If the wear value of the outer ring inner diameter is less than 0.50mm, but there are uneven edges, and the shaft system is installed inside the feed rotary mechanism, making daily maintenance inconvenient, it is decided to discard it and replace it with a new product; if the roller diameter wear value = 29 - 28.7 = 0.3mm, which is greater than 0.10mm, it is decided to discard it and replace it; if the wedge wear deviation is greater than 0.10mm and there is a groove with a depth greater than 0.10mm, it is decided to discard it and replace it with a new product.

[0154] 6. Correction: After replacement, the outer ring and wedge-shaped parts should be ground with a pneumatic grinding wheel to correct burrs, folds, etc., and the contact surface should be smooth and without obvious unevenness.

[0155] II. Measurement of roller installation space parameters and confirmation of roller diameter correction

[0156] Roller installation space parameter measurement

[0157] 1. Install the outer ring and inner star wheel: Install the outer ring in the corresponding oscillating rod shaft. Then, after replacing the wedge, assemble the star wheel in a clockwise direction onto the oscillating rod shaft and clean all contact surfaces.

[0158] 2. Roller positioning point measurement: Take the highest point of the wedge as the measuring point position. Starting from the inner side of the upper end face of the star wheel wedge, the displacement is made to the outer side, L1 = 60.7mm. The displacement L2 should be 0.33 to 0.35 of the width of the upper end face of the wedge, that is, L2 = (0.33 to 0.35) × L1 = (0.33 to 0.35) × 60.7 = 20.03 to 20.25mm. Make sure that the lower cutting point a is within this area.

[0159] 3. Roller positioning point height measurement: This refers to the vertical distance H between the upper and lower tangent points of the rollers within the overrunning clutch. The actual measured H = 28.98 mm.

[0160] Roller diameter correction confirmation

[0161] 1. Standard part measurement: A standard diameter roller with a diameter of d = 29 mm is installed in the overrunning clutch with the upper tangent point a and the lower tangent point b in place. The distance L3 between the inner tangent point position of the roller and the conjugate surface of the star wheel is measured to be 20.70 mm.

[0162] 2. Determine if the roller diameter needs to be corrected: According to L3 = 20.7mm, if it is less than 20.8mm, it should be corrected.

[0163] 3. Correction of equivalent value: When the measured value of L3 is less than 20.8mm, the roller diameter D = standard part diameter d - (20.8 - L3) / 2 = 29 - (20.8 - 20.7) / 2 = 28.95mm.

[0164] III. Roller Fitting

[0165] 1. Determine the roller diameter: Based on the corrected equivalent, the roller diameter D = 28.95 mm is determined, and it is less than the height value H = 28.98 mm between the upper and lower tangent points. The verification is qualified.

[0166] 2. Machining: Based on the determined parameter D = 28.95mm, the outer diameter of the roller is machined using a centerless grinder. The diameter tolerance should be ±0.02mm. Considering the machining error after replacing all the parts with new ones and the parameter value of the height H, the grinding process adopts equal upper and lower deviations, that is, the roller diameter D = 28.93~28.97mm. Five rollers are continuously machined and matched, and the actual measured roller diameter is 28.96mm.

[0167] IV. Reset and Adjustment

[0168] 1. Install the rollers: First, install the 5 sets of spring ratchets in the inner star wheel step hole, and then install the 5 matching rollers with a diameter of D=28.96mm one by one in the overrunning clutch.

[0169] 2. Re-inspection: Use measuring tools to measure the distance value L2 of the lower tangent point a of the roller and the distance value L3 of the inner tangent point c. The measured values ​​are L3 = 20.82 mm and L2 = 20.20 mm, which meet the model requirements of L3 = 20.8~20.9 mm and L2 = (0.33~0.35)×L1 = 20.03~20.25 mm. Select the highest and lowest two wedges from the five wedges for re-inspection, and the values ​​all meet the model requirements.

[0170] 3. Reset: After passing the re-inspection, install the overrunning clutch end cover and other components.

[0171] 4. Inspection: Check the assembly condition of the shaft system, add oil and put it into storage.

[0172] Finally, it should be noted that although the present invention has been described with reference to specific embodiments, those skilled 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. Various equivalent changes or substitutions can be made without departing from the concept of the present invention. Therefore, any changes or modifications to the above embodiments within the essential spirit of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A method for correcting the motion accuracy of an overrunning clutch in a seamless steel pipe cold rolling mill, characterized in that, Includes the following steps: S1. Prepare the overrunning clutch for operation, including the following steps: S11. Before starting work, take safety precautions and prepare materials; S12. Disassemble the overrunning clutch, create a cavity in the outer ring of the overrunning clutch, and clean it; S13. Use standard measuring tools to measure the inner diameter of the outer ring, the flatness of the upper end face of the wedge, and the outer diameter of the roller; S14. Based on the parameters measured in S13, determine and correct for scrapping, including the following steps: S141. Discard criteria: Roller diameter less than the standard value of 0.10mm, wedge bolster upper end face flatness deviation greater than 0.10mm, wedge bolster end face grooved with groove depth greater than 0.10mm, outer ring inner diameter greater than the standard value of 0.50mm, or inner surface with grooves or edges greater than 0.10mm are all discarded. S142. Correction: For wedges with a flatness deviation of less than 0.10mm on the upper end face or grooves on the end face with a groove depth of less than 0.10mm, clutch outer rings with an inner diameter less than 0.5mm of the standard value and grooves on the inner surface with a depth of less than 0.10mm, use a pneumatic grinding wheel for correction. S2. Determination of roller mounting space parameters and confirmation of diameter correction, including the following steps: S21. Measurement of roller mounting space parameters, including the following steps: S211. Assemble the modified star wheel onto the corresponding shaft system in a clockwise direction; S212. Measurement of roller positioning points and roller positioning point height; S22. Confirmation of roller diameter correction, including the following steps: S221. Measure the standard components of the rollers to determine whether the roller diameter needs to be corrected, including the following steps: S2211. The standard value of the distance L3 between the inner tangent point of the roller and the conjugate surface of the star wheel is in the range of 20.8-20.9mm. The roller diameter within this range does not need to be corrected. S2212. The measured value of the distance L3 between the inner tangent point of the roller and the conjugate surface of the star wheel exceeds the range of 20.8-20.9mm and needs to be corrected. S222. Determining the corrected equivalent for the roller diameter includes the following steps: S2221. When the measured value of L3 is greater than 20.9mm, the roller diameter D = standard part diameter d + (L3 - 20.9) / 2; S2222. When the measured value of L3 is less than 20.8mm, the roller diameter D = standard part diameter d - (20.8 - L3) / 2; S3. Machining for the fitting of rollers; S4. Reset and adjust the overrunning clutch.

2. The method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill as described in claim 1, characterized in that, S3 includes the following steps: S31. Determine the roller diameter based on the actual working conditions of the roller correction. S32. Based on the determined diameter parameters, continuously process and manufacture several rollers.

3. The method for correcting the motion accuracy of the overrunning clutch in a seamless steel pipe cold rolling mill as described in claim 2, characterized in that, S4 includes the following steps: S41. Install the rollers and use measuring tools to re-inspect the roller installation position; S42. Reset the overrunning clutch and perform power-on testing.

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