A finishing machining device for the horizontal roll shaft of a universal rolling mill and a machining method thereof

Abstract

The present invention discloses a finishing machining device for the horizontal roll shaft of a universal rolling mill and its machining method, belonging to the technical field of surface machining of shaft and roll parts. The finishing machining device for the horizontal roll shaft of a universal rolling mill and its machining method of the present invention install a sand belt grinding device on existing equipment such as a lathe to realize turning instead of grinding, so as to solve the problems of high purchase cost of grinding machines and large floor area, etc.; the sand belt grinding device includes a driving wheel and a supporting wheel, and the outer surface of the driving wheel is provided with protrusions to play a role of circular arc centering for the sand belt; both ends of the supporting wheel are coaxially installed with retaining rings, and the outer diameter of the retaining rings is greater than the outer diameter of the supporting wheel surface, so as to play a role of preventing the belt from coming off. During operation, the sand belt grinding device is installed at the tool rest placement part of the machine tool, the motor is started to drive the driving wheel to rotate, and then the supporting wheel is driven to rotate through the sand belt, so that the sand belt evenly grinds the workpiece, and the tightness of the sand belt is adjusted by moving the support frame.

Description

Technical Field

[0001] The present invention relates to the technical field of surface processing of shafts and rollers, and more specifically to a finishing processing device and a processing method for a horizontal roller shaft of a universal rolling mill. Background Art

[0002] Higher surface finish requirements are imposed on large shafts and rollers. Generally, a machining allowance of 0.15 - 0.2 mm is left on each side on a lathe, and then grinding on a grinding machine can meet the design requirements. Machinery factories generally do not purchase large grinding machines. Large grinding machines have a single use and can only be used for grinding; moreover, the purchase cost of grinding machines is relatively high and the floor area is relatively large.

[0003] The scope of belt grinding is much wider than that of a grinding wheel grinding machine. All large planes that cannot be ground by a grinding wheel grinding machine and difficult-to-machine materials such as various thick, medium, and thin steel plates as well as stainless steel and titanium alloy plates can be ground; various non-metallic materials and large rolling mills and shaft parts can also be ground. Belt grinding uses a sand belt as an abrasive tool and is assisted by a contact wheel, a tensioning wheel, a driving wheel and other grinding head main bodies as well as an alignment mechanism to jointly complete the processing process of the workpiece. It is a process of sleeving the sand belt on the outer surfaces of the tensioning wheel and the driving wheel, tensioning and aligning it, and then grinding the workpiece according to the appropriate grinding process parameters according to the processing requirements. The currently used sand belt polishing device generally directly drives the contact wheel by the motor shaft and then drives the sand belt to rotate for grinding. The sand belt grinding device is generally divided into two types: wheel pressure type and belt pressure type, and their grinding characteristics are basically the same.

[0004] After retrieval, the European company SCM GROUP SPA proposed a sand belt grinding machine (EP2241401A) in 2009, including a sanding unit provided with a sanding element for sanding the above workpiece. In order to replace the sanding element more quickly, a slidable connecting element is provided for slidably connecting the sanding unit to the sander, so that the sanding unit can move between a retracted position and an extraction position. In the retracted position, the sanding element is located inside the sander for sanding the above components, and in the extraction position, the sanding element at least partially leaves the sander from the sanding element so as to be able to be replaced. Western countries have taken the lead in the technology of sand belt grinding machines due to their developed precision manufacturing industries. China started relatively late in the research and development of sand belt grinding machine technology. Most patent applicants are enterprises, and the technical level still lags behind foreign countries, and no active overseas patent layout has been carried out. Summary of the Invention

[0005] 1. Technical Problems to be Solved by the Invention

[0006] When using an external cylindrical grinding machine for grinding large shaft and roller parts with high surface finish requirements, problems such as large grinding machines being only suitable for grinding and taking up a large floor area exist. The present invention designs a finishing processing device and its processing method for the horizontal roll shaft of a universal rolling mill. By installing a belt grinding device on existing equipment such as a lathe, it realizes grinding by turning, improves the surface finish of the horizontal roll shaft, and meets the design and usage requirements.

[0007] 2. Technical solution

[0008] To achieve the above object, the technical solution provided by the present invention is as follows:

[0009] A finishing processing device for the horizontal roll shaft of a universal rolling mill, including a lathe. A rotating shaft is horizontally arranged in the middle of the inner side of the lathe. A roll shaft is coaxially sleeved on the rotating shaft. Below the rotating shaft, slide frames are symmetrically arranged along its length direction, and the ends of the slide frames are fixedly installed on the inner side of the lathe; a plate support is adaptively installed above the slide frames, and the plate support can be arranged at different positions of the slide frames along the length direction of the slide frames on the lathe; one end of the plate support is fixedly installed with a machine tool turret, and a belt grinding device is detachably installed at the upper end of the machine tool turret. By installing a belt grinding device on existing equipment such as a lathe, grinding by turning is realized, thereby improving the surface finish of the roll shaft and being able to solve problems such as high purchase cost and large floor area of grinding machines.

[0010] A further technical solution, the belt grinding device includes a base, the base includes a bottom frame, the base frame is detachably connected to the turntable on the upper part of the machine tool turret, and the relative position of the base and the machine tool turret is fixed by tightening screws; a support plate is horizontally installed on the upper part of the base frame, a motor support is fixedly installed on the support plate, a motor is fixedly installed on the motor support, and the motor output shaft of the motor is connected to the transmission wheel through a key; a protrusion is provided on the outer surface of the transmission wheel to ensure that the abrasive belt is tensioned during power transmission and to play a role in arc centering, and the size of the protrusion is related to the width of the transmission wheel, and the size of the protrusion is approximately 0.25 to 0.3 times the width of the transmission wheel; the diameter of the transmission wheel is calculated according to the motor speed and the maximum linear speed of the abrasive belt, and the maximum linear speed is controlled at 40m / s; a support plate is provided on the side of the support plate close to the motor output shaft, and the outer side of the support plate is fixed Material toggling mechanism, its both ends are to be connected with the support frame, and the supporting frame is to be connected with the support frame by the support frame, and the supporting frame is to be connected with the support frame of the supporting frame by the support frame. The scope of belt grinding is much wider than that of grinding wheel grinders. It can grind large flat surfaces and difficult-to-process materials that cannot be ground by grinding wheel grinders, such as various thick, medium and thin steel plates, as well as stainless steel and titanium alloy plates. It can also grind various non-metallic materials and large rollers and shaft parts.

[0011] A further technical solution is that the support plate is transversely provided with a waist-shaped groove, the angle between the waist-shaped groove and the horizontal plane being 10° to 15°. The waist-shaped groove inclined to the horizontal plane not only serves to elevate the support frame, but also ensures that the abrasive belt is tangent to the surface to be ground of the roller when the support frame moves left and right along the waist-shaped groove. The relative position of the support frame and the support plate is then fixed by bolts 1, and the tightness of the abrasive belt is adjusted by moving the support frame; the two supports are fixedly connected by a connecting block, the outer end of which is detachably connected to a positioning block by bolts 1, and the positioning block is set between the support frame and the support plate; a tensioning adjustment screw hole is transversely provided on the support plate, and a tensioning screw is coaxially installed inside the tensioning adjustment screw hole. The end of the tensioning screw contacts the outer surface of the connecting block to compress the support frame, thereby controlling the longitudinal feed amount.

[0012] Further technical solution: A guide rail is arranged along the length direction in the middle of the upper surface of the carriage; corresponding to the position of the guide rail, sliding grooves are symmetrically opened on the lower surface of the plate support, and the sliding grooves can be fitted and engaged with the guide rail, and the plate support can slide left and right along the guide rail on the carriage, so as to realize the turning function. In the present invention, a sand belt is pressed against the surface of the workpiece for grinding, and the contact pressure is relatively small, and the metal allowance removed per unit time is very small.

[0013] Further technical solution: Hoisting bolt holes are vertically and symmetrically opened on the support plate for hoisting the entire sand belt grinding device.

[0014] A finishing machining method for the horizontal roll shaft of a universal rolling mill includes the following steps:

[0015] Step 1: Install the fabricated tooling: After the roll shaft is finish-turned, remove the turning tool, and based on the original lathe, symmetrically install carriages below the roll shaft, fit a plate support on the carriages, and detachably install a sand belt grinding device on the turret of the machine tool provided at one end of the plate support;

[0016] Step 2: Semi-finish grinding: The sand belt of the sand belt grinding device is selected with corundum abrasive and a particle size of GB100-120#, adjust the position of the sand belt grinding device until the sand belt contacts the roll shaft, and then fix it with a compression screw; start the motor, and use the sand belt to grind the roll shaft with a longitudinal feed rate of 3-5 mm / r to remove the turning marks. The plate support is driven by the operation buttons of the machine tool part to slide along the carriage to realize the longitudinal feed;

[0017] Step 3: Finish grinding: The sand belt is selected with corundum abrasive and a particle size of GB180#-GB240#, loosen bolt Ι, translate the support frame 0.02-0.05 mm closer to the roll shaft and then tighten bolt Ι, and tighten the tensioning screw to keep the sand belt taut and fitted around the roll shaft. Start the motor and pour coolant to improve the surface quality of the workpiece, so that the grinding life and grinding efficiency of the sand belt are also correspondingly improved. At the same time, perform finish grinding with a longitudinal feed rate of 1-3 mm / r. Since the strength of the sand belt is limited, the linear velocity is controlled at 30-40 m / s to meet the roughness requirements.

[0018] For a further technical solution, in step 3, the grinding depth for high-hardness and difficult-to-grind materials is 0.02 - 0.03 mm; the grinding depth for ordinary materials is 0.03 - 0.05 mm. In abrasive belt grinding, a force must be applied to the workpiece to perform grinding, and this applied force is called the grinding pressure or contact force. The magnitude of the contact force depends on the grinding depth and the surface quality of the workpiece being ground. The deeper the grinding, the greater the grinding pressure and the larger the surface roughness value. Generally, the maximum grinding allowance left after metal cutting is about 0.10 mm. During rough grinding, a coarse-grained abrasive belt is used, with a large longitudinal feed and a large grinding pressure, but the surface roughness value of the workpiece ground in this way is large; during fine grinding, a fine-grained abrasive belt, a small longitudinal feed rate, and a small grinding pressure are required, so that the surface roughness value of the workpiece ground is small.

[0019] 3. Beneficial effects

[0020] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0021] (1) For a universal rolling mill horizontal roll shaft finishing processing device and its processing method of the present invention, an abrasive belt grinding device is installed on existing equipment such as a lathe to realize turning instead of grinding, so as to improve the surface finish of the horizontal roll shaft and solve problems such as the high purchase cost and large floor area of grinding machines;

[0022] (2) For a universal rolling mill horizontal roll shaft finishing processing device and its processing method of the present invention, carriage supports are symmetrically arranged below the lathe, a plate support is adaptively installed above the carriage supports, and the abrasive belt grinding device is arranged at one end of the plate support through a machine tool turret. Through the cooperation of a guide rail and a chute, the plate support can slide left and right along the guide rail on the carriage supports, thereby realizing the turning function;

[0023] (3) For a universal rolling mill horizontal roll shaft finishing processing device and its processing method of the present invention, a support plate is arranged on one side of the support plate close to the output shaft of the motor, a support frame is fixedly installed outside the support plate, the support frame includes two groups of brackets arranged in parallel, the brackets are V-shaped structures, a clamping groove is horizontally opened at the outer end of the brackets, and a rotating shaft extending from the end of the support wheel can be clamped in the clamping groove and fixed by a nut, so as to fix the support wheel on the support frame and enable the support wheel to rotate around its rotating shaft;

[0024] (4) For a universal rolling mill horizontal roll shaft finishing processing device and its processing method of the present invention, an abrasive belt is wound around the support wheel and is in transmission connection with a driving wheel through the abrasive belt; during operation, the chassis is installed at the tool rest placement part of the machine tool, the driving wheel is driven to rotate by the motor, the support wheel is driven to rotate through the abrasive belt, so that the abrasive belt contacts the workpiece for grinding;

[0025] (5) A finishing machining device and method for the horizontal roll shaft of a universal rolling mill according to the present invention. A waist-shaped groove is transversely opened on the support plate, and the included angle between the waist-shaped groove and the horizontal plane is 10° - 15°. Setting a waist-shaped groove inclined to the horizontal plane can, on the one hand, play a role in raising the support frame, and on the other hand, it can also ensure that when the support frame moves left and right along the waist-shaped groove, the abrasive belt always remains tangent to the grinding surface of the roll shaft; the tightness of the abrasive belt is controlled by moving the support frame;

[0026] (6) A finishing machining device and method for the horizontal roll shaft of a universal rolling mill according to the present invention. A tension adjustment screw hole is transversely opened on the support plate. A tension screw is coaxially installed inside the tension adjustment screw hole, and the end of the tension screw presses against the outer surface of the connecting block to fix the support frame, thereby controlling the longitudinal feed amount;

[0027] (7) A finishing machining device and method for the horizontal roll shaft of a universal rolling mill according to the present invention. For grinding high-hardness and difficult-to-grind materials, the grinding depth is: 0.02 - 0.03 mm; for ordinary materials, the grinding depth is: 0.03 - 0.05 mm; when rough grinding, a coarse-grained abrasive belt is used, with a larger longitudinal feed and a larger grinding pressure, but the surface roughness value of the machined workpiece is larger; when fine grinding, a fine-grained abrasive belt, a smaller longitudinal feed amount, and a smaller grinding pressure are required, so that the surface roughness value of the machined workpiece is smaller;

[0028] (8) A finishing machining device and method for the horizontal roll shaft of a universal rolling mill according to the present invention. Retaining rings are coaxially installed at both ends of the support wheel, and an abrasive belt is wound around the wheel surface of the support wheel between the retaining rings. The retaining rings are arranged at both ends of the support wheel and have an outer diameter larger than the outer diameter of the wheel surface of the support wheel, thereby playing a role in preventing the belt from coming off and guiding the transmitted abrasive belt to be centered;

[0029] (9) A finishing machining device and method for the horizontal roll shaft of a universal rolling mill according to the present invention. The driving wheel is connected to the output shaft of the motor by a key. Protrusions are provided on the outer surface of the driving wheel to ensure that the abrasive belt is tensioned during the power transmission process and also play a role in circular arc centering. The size of the protrusion amount is related to the width of the driving wheel, and the size of the protrusion amount is about 0.25 - 0.3 times the width of the driving wheel. Description of the Drawings

[0030] Figure 1 is a schematic three-dimensional structure diagram of the finishing machining device for the horizontal roll shaft of the universal rolling mill according to the present invention;

[0031] Figure 2 is Figure 1 the right view of; [[ID=?]]

[0032] Figure 3 is a schematic structure diagram of the lathe and the roll shaft in the assembled state according to the present invention;

[0033] It should be noted that there seems to be an error in the original text where there is an undefined "?" in the line with ID=26. This has been retained as is in the translation.Figure 4 Schematic structural diagram of the abrasive belt grinding device in the present invention;

[0034] Figure 5 is Figure 4 front view of;

[0035] Figure 6 is Figure 4 rear view of;

[0036] Figure 7 Schematic structural diagram of the base assembly of the abrasive belt grinding device in the present invention;

[0037] Figure 8 Schematic structural diagram of the support frame of the abrasive belt grinding device in the present invention;

[0038] Figure 9 Schematic three - dimensional structure diagram of the driving wheel in the present invention;

[0039] Figure 10 is Figure 9 longitudinal sectional view;

[0040] Figure 11 Schematic structural diagram of the support wheel in the invention.

[0041] In the figure: 1 - lathe; 2 - roller shaft; 3 - plate support; 4 - machine tool turret; 5 - abrasive belt grinding device; 11 - rotating shaft; 12 - carriage; 31 - chute; 41 - turntable; 42 - compression screw; 51 - base; 52 - motor; 53 - driving wheel; 54 - support frame; 55 - support wheel; 56 - abrasive belt; 57 - tensioning screw; 121 - guide rail; 511 - chassis; 512 - support plate; 513 - motor support; 514 - support plate; 515 - waist - shaped slot; 516 - tensioning adjustment screw hole; 517 - eyebolt hole; 531 - protrusion; 541 - bracket; 542 - card slot; 543 - connecting block; 544 - positioning block; 545 - bolt Ι; 551 - rotating shaft; 552 - retaining ring; 553 - support wheel surface. Specific embodiments

[0042] To further understand the content of the present invention, the present invention will be described in detail with reference to the accompanying drawings.

[0043] Embodiment 1

[0044] A finishing processing device for the horizontal roller shaft of a universal rolling mill in this embodiment, as Figures 1 - 3As shown in the figure, it includes a lathe 1. In the middle of the inner side of the lathe 1, a rotating shaft 11 is horizontally arranged. A roller shaft 2 is coaxially sleeved on the rotating shaft 11. Symmetrically arranged along the length direction of the rotating shaft 11 below are carriage 12, and the ends of the carriage 12 are fixedly installed on the inner side surface of the lathe 1. Above the carriage 12, a plate support 3 is adaptively installed. In the middle of the upper surface of the carriage 12, a guide rail 121 is arranged along its length direction. Corresponding to the position of the guide rail 121 on the lower surface of the plate support 3, sliding grooves 31 are symmetrically opened. The sliding grooves 31 and the guide rail 121 can be adaptively engaged, and the plate support 3 can slide left and right along the guide rail 121 on the carriage 12, so as to realize the turning function. The abrasive belt 56 is used to press on the surface of the roller shaft 2 for grinding, and its contact pressure is relatively small, and the metal allowance removed per unit time is very small. The plate support 3 can be arranged at different positions on the carriage 12 along the length direction of the carriage 12. One end of the plate support 3 is fixedly installed with a machine tool turret 4, and a belt grinding device 5 is detachably installed at the upper end of the machine tool turret 4. By installing the belt grinding device 5 on existing equipment such as lathes, turning is used instead of grinding, so as to improve the surface finish of the roller shaft 2 and solve problems such as high purchase cost and large floor area of grinders.

[0045] In this embodiment, the belt grinding device 5 can perform external cylindrical grinding on a horizontal lathe, internal and external cylindrical grinding and end face grinding on a vertical lathe, and can also be used for surface grinding on a planer. When used on various machine tools, only the clamping direction is different, so as to effectively save costs and reduce the purchase cost of grinders.

[0046] Embodiment 2

[0047] The basic structure of a finishing machining device for the horizontal roller shaft of a universal rolling mill in this embodiment is the same as that in Embodiment 1. The differences and improvements are as follows: As Figures 4 - 6 shown, the belt grinding device 5 includes a base 51. The base 51 includes a bottom frame 511. The bottom frame 511 is detachably connected to the turntable 41 at the upper part of the machine tool turret 4, and the relative positions of the base 51 and the machine tool turret 4 are fixed by a compression screw 42. Horizontally installed on the upper part of the bottom frame 511 is a support plate 512. A motor support 513 is fixedly installed on the support plate 512, and a motor 52 is fixedly installed on the motor support 513. As Figures 9 - 10As shown, the output shaft of the motor 52 is connected to the transmission wheel 53 via a key. The outer surface of the transmission wheel 53 is provided with a protrusion 531. The size of the protrusion is calculated according to the following formula: f = (0.25-0.3) H, where f is the protrusion and H is the width of the transmission wheel 53. In the test, if the protrusion is less than this range, it will cause unclear centering and the sanding belt 56 to fall off. If the protrusion is greater than this range, it will cause poor transmission effect and even slipping. The diameter of the transmission wheel 53 is calculated based on the speed of the motor 52 and the maximum linear speed of the sanding belt: D = V*60 / n*Pi, where D is the maximum outer diameter of the transmission wheel, V is the maximum linear speed of the sanding belt, n is the motor speed (rpm), and Pi is the value of pi. The maximum linear speed is controlled at 40m / s. The transmission wheel 53 is a main component in the abrasive belt polishing device. It is made of aluminum and is lightweight. It not only transmits power and tensions the abrasive belt, but also controls the abrasive belt 56 from falling off during high-speed rotation. This is ensured by the protrusion of the outer surface of the transmission wheel 53. A support plate 514 is provided on the side of the support plate 512 close to the motor output shaft. A support frame 54 is fixedly installed on the outer side of the support plate 514. The support frame 54 includes two sets of brackets 541 arranged in parallel. The brackets 541 are V-shaped structures. A slot 542 is laterally provided at the outer end of the bracket 541. The slot 542 can engage with the shaft 551 extending outward from the end of the support wheel 55 and is fixed by a nut, thereby fixing the support wheel 55 on the support frame 54 and enabling the support wheel 55 to rotate around its shaft 551. Figure 11 As shown, retaining rings 552 are coaxially mounted on both ends of the support wheel 55, and an abrasive belt 56 is wound around the support wheel surface 553 between the retaining rings 552. The outer diameter of the retaining ring 552 is larger than the outer diameter of the support wheel surface 553. The retaining ring 552 plays a centering and guiding role for the conveyed abrasive belt 56, thereby preventing the belt from falling off. The support wheel 55 is connected to the transmission wheel 53 through the abrasive belt 56.

[0048] During operation, the base frame 511 is mounted on the tool holder of the machine tool. The motor 52 drives the transmission wheel 53 to rotate, which in turn drives the support wheel 55 to rotate via the abrasive belt 56. The machine tool also drives the roller 2 to rotate. The abrasive belt 56 rotates in the opposite direction of the roller 2, and the abrasive belt 56 uniformly contacts the workpiece to perform grinding. Compared with wheel pressure abrasive belt grinding, belt pressure grinding uses a contact wheel to apply pressure to the workpiece surface for grinding. Due to the high contact pressure, this grinding method removes a large amount of metal per unit time and is highly efficient. Belt pressure grinding uses an abrasive belt to apply pressure to the workpiece surface for grinding. The contact pressure is relatively low, and the amount of metal removed per unit time is very small.

[0049] In this embodiment, the abrasive belt 56 is formed by attaching abrasive grains to the substrate using two methods: the gravity method and the electrostatic method. The grinding range of the abrasive belt is much wider than that of a grinding wheel grinder. Large flat surfaces that cannot be ground by a grinding wheel grinder, as well as difficult-to-machine materials such as various thick, medium, and thin steel plates and stainless steel titanium alloy plates, can all be ground. It can also grind various non-metallic materials, large rolling rolls, and shaft parts.

[0050] Embodiment 3

[0051] A finishing machining device for the horizontal roll shaft of a universal rolling mill in this embodiment has the same basic structure as that in Embodiment 2. The differences and improvements are as follows: As Figure 7 shown, a waist-shaped groove 515 is transversely opened on the support plate 514. The included angle between the waist-shaped groove 515 and the horizontal plane is 10° - 15°, enabling the support frame 54 to translate left and right along the waist-shaped groove 515, and the relative position of the support frame 54 and the support plate 514 is fixed by bolt Ι 545. The tightness of the abrasive belt 56 is adjusted by moving the support frame; As Figure 8 shown, the two support brackets 541 are fixedly connected by a connecting block 543. The outer end of the connecting block 543 is detachably connected with a positioning block 544 by bolt Ι 545. The positioning block 544 is arranged between the support frame 54 and the support plate 514; A tension adjustment screw hole 516 is transversely opened on the support plate 514. A tension screw 57 is coaxially installed inside the tension adjustment screw hole 516. The end of the tension screw 57 is in contact with the outer surface of the connecting block 543 to press the support frame 54, thereby controlling the longitudinal feed amount.

[0052] Embodiment 4

[0053] A finishing machining device for the horizontal roll shaft of a universal rolling mill in this embodiment has the same basic structure as that in Embodiment 3. The differences and improvements are as follows: As Figure 7 shown, lifting eye bolt holes 517 are vertically and symmetrically opened on the support plate 512 for lifting the entire abrasive belt grinding device 5.

[0054] Embodiment 5

[0055] A finishing machining method for the horizontal roll shaft of a universal rolling mill in this embodiment has the same basic structure as that in Embodiment 4. The differences and improvements are as follows: As Figures 1 - 3 shown, it includes the following steps:

[0056] Step 1: Install the fabricated tooling. After the precision turning of the roll shaft 2 is completed, remove the turning tool. Based on the original lathe, install slide frames 12 symmetrically below the roll shaft 2. A plate support 3 is adaptively installed on the slide frames 12. The abrasive belt grinding device 5 is detachably installed on the turret 4 of one end of the plate support (3);

[0057] Step 2. Semi-precision grinding: The abrasive belt 56 of the abrasive belt grinding device 5 is made of corundum abrasive with a particle size of GB100 - 120#. Adjust the position of the abrasive belt grinding device 5 until the abrasive belt 56 contacts the roller shaft 2, and then fix it with the pressing screw 42. Start the motor 52 to drive the abrasive belt 56, and turn on the operation buttons of the machine tool part to drive the plate support 3 to slide along the guide rail 121 on the carriage 12. Use a longitudinal feed rate of 3 - 5 mm / r and perform grinding by evenly contacting the abrasive belt 56 with the roller shaft 2 to remove the turning marks and achieve longitudinal feed.

[0058] Step 3. Precision grinding: The abrasive belt 56 is made of corundum abrasive with a particle size of GB180# - GB240#. Loosen the bolt Ι545. For high-hardness and difficult-to-grind materials, translate the support frame 54 0.02 - 0.03 mm closer to the roller shaft 2 and then tighten the bolt Ι545. For the grinding of ordinary materials, translate the support frame 54 0.03 - 0.05 mm closer to the roller shaft 2 and then tighten the bolt Ι545. Finally, tighten the tensioning screw 57 to keep the abrasive belt 56 taut and attached to the periphery of the roller shaft 2. During operation, start the motor 52 and pour coolant to improve the surface quality of the workpiece, which also correspondingly improves the grinding life and grinding efficiency of the abrasive belt 56. At the same time, perform precision grinding with a longitudinal feed rate of 1 - 3 mm / r. Since the strength of the abrasive belt 56 is limited, the linear velocity should be controlled within 30 - 40 m / s to meet the roughness requirements.

[0059] In this embodiment, a force must be applied to the workpiece during abrasive belt grinding, and this force is called the grinding pressure or contact force. The magnitude of the contact force depends on the grinding depth and the surface quality of the ground workpiece. The deeper the grinding, the greater the grinding pressure and the larger the surface roughness value. Generally, the maximum grinding allowance left after metal cutting is about 0.10 mm. During rough grinding, use a coarse-grained abrasive belt 56, a larger longitudinal feed, and a larger grinding pressure, but the surface roughness value of the ground workpiece is larger. During precision grinding, a fine-grained abrasive belt 56, a smaller longitudinal feed rate, and a smaller grinding pressure should be used, so that the surface roughness value of the ground workpiece is smaller.

[0060] The above schematically describes the present invention and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural forms and embodiments to this technical solution without creative efforts without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A finishing machining device for the horizontal roll shaft of a universal rolling mill, comprising a lathe (1), wherein a first rotating shaft (11) is horizontally arranged in the middle of the inner side surface of the lathe (1), and a roll shaft (2) is coaxially sleeved on the first rotating shaft (11), and it is characterized in that: Below the first rotating shaft (11), carriage (12) is symmetrically arranged along its length direction, and the end of the carriage (12) is fixedly installed on the inner side of the lathe (1); above the carriage (12), a plate support (3) is adaptively installed, and the plate support (3) can be arranged at different positions along the length direction of the carriage (12); one end of the plate support (3) is fixedly installed with a machine tool turret (4), and a belt grinding device (5) is detachably installed at the upper end of the machine tool turret (4); The belt grinding device (5) includes a base (51), and the base (51) is detachably installed on a turntable (SI) at the upper part of the machine tool turret (4), and the relative position of the base (51) and the machine tool turret (4) is fixed by a pressing screw (42); The base (51) includes a chassis (511), the chassis (511) is detachably connected to the turntable (41), a first support plate (512) is horizontally installed on the upper part of the chassis (511), a motor support (513) is fixedly installed on the first support plate (512), a motor (52) is fixedly installed on the motor support (513), a transmission wheel (53) is externally connected to the motor output shaft of the motor (52), and a protrusion (531) is arranged on the outer surface of the transmission wheel (53). The size of the protrusion amount is calculated according to the following formula: f=(0.25~0.3)H, In the formula, f is the protrusion amount, and H is the width of the transmission wheel (53); The diameter of the transmission wheel (53) is calculated according to the rotation speed of the motor (52) and the maximum linear speed of the belt: D=V*60 / n*Pi, In the formula, D is the maximum outer diameter of the transmission wheel, V is the maximum linear speed of the belt, n is the rotation speed of the motor, and Pi is the value of pi; On one side of the first support plate (512) close to the motor output shaft, a second support plate (514) is arranged, a waist-shaped groove (515) is transversely opened on the second support plate (514), the included angle between the waist-shaped groove and the horizontal plane is 10°~15°, and a support frame (54) is fixedly installed outside the second support plate (514) through the waist-shaped groove (515) in cooperation with a bolt Ι (545); The support frame (54) includes two groups of brackets (541) arranged in parallel. The brackets (541) are V-shaped structures. A clamping groove (542) is transversely opened at the outer end of the brackets (541). A support wheel (55) is clamped in the clamping groove (542) through a second rotating shaft (551) and fixed by a nut; retaining rings (552) are coaxially installed at both ends of the support wheel (55). A belt (56) is wound on the support wheel surface (553) between the two retaining rings (552). The support wheel (55) is in transmission connection with the transmission wheel (53) through the belt (56), and the outer diameter of the retaining ring (552) is larger than the outer diameter of the support wheel surface (553); the belt (56) is formed by coating abrasive grains on the substrate by two methods of gravity method and electrostatic method; The two brackets (541) are fixedly connected through a connecting block (543); a positioning block (544) is detachably connected to the outer end of the connecting block (543) through a bolt Ι (545), and the positioning block (544) is arranged between the support frame (54) and the second support plate (514); a tension adjustment screw hole (516) is transversely formed in the second support plate (514), a tension screw (57) is coaxially installed inside the tension adjustment screw hole (516), and the end of the tension screw (57) is in contact with the outer surface of the connecting block (543). A guide rail (121) is arranged in the middle of the upper surface of the carriage (12) along its length direction; sliding grooves (31) are symmetrically formed in the lower surface of the plate support (3) corresponding to the position of the guide rail (121), the sliding grooves (31) and the guide rail (121) can be adaptively engaged, and the plate support (3) can slide left and right along the guide rail (121) on the carriage (12). Hanging ring bolt holes (517) are also vertically and symmetrically formed in the first support plate (512). The abrasive belt (56) includes an abrasive belt with coarse grain size and an abrasive belt with fine grain size. The abrasive belt with coarse grain size is used for rough grinding, and the abrasive belt with fine grain size is required for finish grinding.

2. A processing method of the finishing machining device for the horizontal roll shaft of a universal rolling mill according to claim 1, characterized in that, It includes the following steps: Step 1: Install the fabricated tooling: After the precision turning of the roller shaft (2) is completed, remove the turning tool. Based on the original lathe, symmetrically install the carriage (12) below the roller shaft (2), a plate support (3) is adaptively installed on the carriage (12), and an abrasive belt grinding device (5) is detachably installed on the turret (4) at one end of the plate support (3). Step 2: Semi-finish grinding: The abrasive belt (56) of the abrasive belt grinding device (5) is selected with corundum abrasive and a grain size of GB100 - 120#. Adjust the position of the abrasive belt grinding device (5) until the abrasive belt (56) contacts the roller shaft (2), and then fix it through the compression screw (42); start the motor (52) to drive the transmission of the abrasive belt (56), and use the abrasive belt (56) to grind the roller shaft (2) with a longitudinal feed rate of 3 - 5 mm / r to remove the turning marks. Step 3: Finish grinding: The abrasive belt (56) is selected with corundum abrasive and a grain size of GB180# - GB240#. Loosen the bolt Ι (545), translate the support frame (54) 0.02 - 0.05 mm towards the direction close to the roller shaft (2) and then tighten the bolt Ι (545), and tighten the tension screw (57) to make the abrasive belt (56) keep tensioned and fit around the roller shaft (2). Start the motor (52), and while pouring coolant, perform finish grinding with a longitudinal feed rate of 1 - 3 mm / r, and the linear speed is controlled at 30 - 40 m / s to meet the roughness requirements.

3. The processing method according to claim 2, characterized in that: In Step 3, for the grinding depth of high-hardness and difficult-to-grind materials: 0.02 - 0.03 mm; for ordinary materials: 0.03 - 0.05 mm.

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