A pin grinding apparatus

Abstract

The application relates to the technical field of grinding devices and discloses a shaft pin grinding device, which comprises a centerless grinding machine, matched grinding wheels and rubber guide wheels, a round run-out suppression support plate which is arranged on the centerless grinding machine and is located below the grinding wheels and the rubber guide wheels and is used for supporting a shaft pin, a magnetic attraction part and a magnetic force adjusting part arranged in the round run-out suppression support plate, and the magnetic attraction part generates downward attraction to the shaft pin arranged on the top of the round run-out suppression support plate. The round run-out suppression support plate is improved, one side with the most waste after cutting is designed as a large-angle slope through the top part, most of the waste can be quickly removed through cooperation with cutting fluid, a downward force is provided to the shaft pin through a rubidium magnet, the run-out of the shaft pin during processing is effectively suppressed, and the contact area of the round run-out suppression support plate and the shaft pin is reduced through the arrangement of a liquid guide groove.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, specifically to a shaft pin grinding device. Background Technology

[0002] A centerless grinder is a type of grinder that requires no centers or chucks for positioning, enabling efficient and precise machining of the outer diameter of cylindrical workpieces. Its core operation relies on a triangular support system consisting of the grinding wheel, guide wheel, and support plate to achieve grinding. Figure 1 (Existing technology grinding principle diagram), in which the center of the shaft pin 11 is located above the line connecting the centers of the grinding wheel 10 and the rubber guide wheel 13. The support plate 12 is used to support the shaft pin 11. The rotation speed of the grinding wheel 10 is higher than that of the rubber guide wheel 13. Furthermore, the axis of the rubber guide wheel 13 is not parallel to the axis of the grinding wheel 10. The guide wheel is deflected at a small angle (θ≈1°~3°) on the horizontal plane. Thus, when the guide wheel rotates, the frictional force on the pin surface is decomposed into two directions: the circumferential force causes the pin to rotate, and the axial force pushes the pin forward.

[0003] The problem with existing technology is that the workpiece rotates in mid-air without radial constraint. The principle of centerless grinding is that the grinding wheel, guide wheel, and support plate make three-point contact with the pin, but there is no downward clamping force. The pin relies entirely on its own weight to press against the support plate. When rotating at high speed, even a slight imbalance, grinding force disturbance, or slight fluctuation in speed will cause the workpiece to bounce slightly. The support plate only provides line contact support, and the support area is very small. Without downward constraint force, the pin will bounce slightly when rotating, which is especially noticeable for slender parts. This makes it difficult to improve the roundness accuracy of the parts and results in inconsistent polishing brightness. Summary of the Invention

[0004] The purpose of this invention is to provide a pin grinding device to solve the problems mentioned in the background art.

[0005] A pin grinding device, comprising:

[0006] Centerless grinder, and matching grinding wheels and rubber guide wheels;

[0007] A circular runout suppression support plate is fitted on a centerless grinder and located below the grinding wheel and the rubber guide wheel to support the shaft pin.

[0008] The circular runout suppression support plate is provided with a magnetic attraction part and a magnetic force adjustment part. The magnetic attraction part generates a downward attraction force on the shaft pin placed at the top of the circular runout suppression support plate. Under the action of the magnetic attraction force, the shaft pin fits more closely to the circular runout suppression support plate and is suppressed from running out during the subsequent grinding process.

[0009] Preferably, the circular runout suppression support plate includes a downwardly open upper shell and a lower sealing plate, as well as a rubber waterproof gasket sandwiched between the lower sealing plate and the upper shell. The bottom of the upper shell is provided with a flange plate, which has holes and is fixed to the lower sealing plate by bolts. The upper shell is hollow inside for assembling a magnetic attraction part and a magnetic force adjustment part.

[0010] Preferably, the magnetic attraction part is a strip-shaped permanent magnet, which is embedded in the circular runout suppression support plate and has a designated space for movement. The magnetic force adjustment part restricts the position of the permanent magnet in the space for movement, so as to adjust the distance between the permanent magnet and the top of the circular runout suppression support plate.

[0011] Preferably, the magnetic adjustment unit includes an adjustment rod rotatably disposed within the upper housing, with one end of the adjustment rod extending outwards. A bearing is installed within the upper housing, and a composite shaft is installed within the inner ring of the bearing. Under the action of the bearing, the composite shaft can rotate relative to the adjustment rod. A driving bevel tooth is fixedly provided on the adjustment rod, and a driven bevel tooth is fixedly provided at the end of the composite shaft. The driving bevel tooth and the driven bevel tooth mesh with each other. The upper half of the composite shaft is a threaded section. A sleeve is also slidably disposed within the upper housing. A neodymium magnet is fixedly clamped at the upper end of the sleeve, and a connecting rod mating part with a threaded hole is fixedly provided on the lower end face of the sleeve. The connecting rod mating part and the threaded section are threadedly mated.

[0012] Preferably, the magnetic attraction part is an electromagnet.

[0013] Preferably, the magnetic force adjustment unit includes a power switch, a controller, and a rectifier module, and achieves magnetic force adjustment by adjusting the input voltage.

[0014] Preferably, the top of the upper housing includes a horizontal transition plane and a support surface facing the rubber guide wheel, and a secondary chip removal surface facing the grinding wheel. The contact position between the grinding wheel and the pin is located above the secondary chip removal surface, and the bearing position of the circular runout suppression plate on the pin is located on the support surface.

[0015] Preferably, liquid guiding grooves are provided at intervals on the support surface, and the depth of the liquid guiding grooves is the same as the interval width of the liquid guiding grooves.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the support runout suppression plate has been improved. On the one hand, by setting the top partition, the side with the most waste generated after cutting is designed with a large-angle slope, which, together with the cutting fluid, can quickly remove most of the waste. On the other hand, the neodymium magnet provides a downward force to the shaft pin, effectively suppressing the runout phenomenon of the shaft pin during processing. In addition, the setting of the liquid guide groove reduces the contact area between the runout suppression plate and the shaft pin, thus effectively reducing contact friction and reducing the probability of scratches. Furthermore, the liquid guide groove is filled with cutting fluid during operation, and the shaft pin has a dynamic displacement of rotation and axial forward movement. Thus, the cutting fluid can play a certain lubricating role and improve the smoothness of the dynamic displacement of the shaft pin.

[0017] During the grinding and polishing process, the magnetic attraction part generates a downward traction force on the shaft pin 11. Under such circumstances, the radial runout of the shaft pin 11 relative to the circular runout suppression support plate 14 is effectively suppressed, and the shaft pin 11 is assisted in positioning without the need for a hard clamp. In particular, in order to reduce the contact friction between the shaft pin 11 and the circular runout suppression support plate 14 increased by the magnetic attraction part, a liquid guide groove 22 is set to reduce the contact area. The liquid guide groove 22 is cleverly used to guide and discharge the cutting fluid. Compared with the prior art where the cutting fluid carries grinding waste and impacts and squeezes between the upper inclined surface of the support plate 12 and the shaft pin 11, this device is more reasonable. It effectively realizes the flow of cutting fluid and also uses the cutting fluid to lubricate and cool the moving shaft pin 11 during the flow of cutting fluid through the liquid guide groove 22. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a centerless grinder in the existing technology;

[0019] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 3 This is a top view of the structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the circular runout suppression support plate 14 in this invention;

[0022] Figure 5 This is a schematic diagram of the circular runout suppression support plate 14 from another perspective in this invention;

[0023] Figure 6 This is a schematic diagram of the internal structure of the circular runout suppression support plate 14 in this invention;

[0024] Figure 7 This is a schematic diagram of the grinding principle of the present invention.

[0025] The markings in the attached diagram are described as follows: 10. Grinding wheel; 11. Shaft pin; 12. Support plate; 13. Rubber guide wheel; 14. Circular runout suppression support plate; 15. Upper housing; 16. Flange plate; 17. Lower sealing plate; 18. Rubber waterproof gasket; 19. Adjusting rod; 20. Secondary chip removal surface; 21. Support surface; 22. Liquid guide groove; 23. Transition plane; 24. Driving bevel gear; 25. Bearing; 26. Composite shaft; 27. Driven bevel gear; 28. Connecting rod mating part; 29. ​​Jacket; 30. Rubber magnet. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-7 The present invention provides a shaft pin grinding device, comprising:

[0028] The centerless grinder, along with its matching grinding wheel 10 and rubber guide wheel 13, has a specific structure that is existing technology and will not be described in detail here.

[0029] A circular runout suppression support plate 14 is fitted on a centerless grinder and located below the grinding wheel 10 and the rubber guide wheel 13 to support the shaft pin 11.

[0030] The circular runout suppression support plate 14 is provided with a magnetic attraction part and a magnetic force adjustment part. The magnetic attraction part generates a downward attraction force on the shaft pin 11 placed on the top of the circular runout suppression support plate 14. Under the action of magnetic attraction, the shaft pin 11 fits more closely to the circular runout suppression support plate 14 and is suppressed from running out during the subsequent grinding process.

[0031] Preferably, the circular runout suppression support plate 14 includes an upper shell 15 with a downward opening and a lower sealing plate 17, as well as a rubber waterproof gasket 18 sandwiched between the lower sealing plate 17 and the upper shell 15. The bottom of the upper shell 15 is provided with a flange plate 16, which has holes and is fixed to the lower sealing plate 17 by bolts. The upper shell 15 is hollow inside for assembling the magnetic attraction part and the magnetic force adjustment part.

[0032] Preferably, the magnetic attraction part is a strip-shaped permanent magnet, which is embedded in the circular jump suppression support plate 14 and has a designated movement space. The magnetic force adjustment part restricts the position of the permanent magnet in the movement space to adjust the distance between the permanent magnet and the top of the circular jump suppression support plate 14 (i.e., the position where the circular jump suppression support plate 14 supports the shaft pin 11), thereby realizing the adjustment of different magnetic attraction forces. By adjustment, different magnetic attraction forces can be used to limit the jump of the shaft pin 11 within a certain range.

[0033] Preferably, the magnetic adjustment unit includes an adjustment rod 19 rotatably disposed within the upper housing 15, with one end of the adjustment rod 19 extending out for easy operation and adjustment. A bearing 25 is mounted inside the upper housing 15, and a composite shaft 26 is mounted on the inner ring of the bearing 25. Under the action of the bearing 25, the composite shaft 26 can rotate relative to the adjustment rod 19. A driving bevel tooth 24 is fixedly provided on the adjustment rod 19, and a driven bevel tooth 27 is fixedly provided at the end of the composite shaft 26. The driving bevel tooth 24 and the driven bevel tooth 27 mesh with each other. The upper part is a threaded section. A sleeve 29 is also slidably provided inside the upper housing 15. A neodymium magnet 30 is clamped and fixed at the upper end of the sleeve 29. A connecting rod mating part 28 with a threaded hole is fixed at the lower end face of the sleeve 29. The connecting rod mating part 28 and the threaded section are threadedly mated. Specifically, when the adjusting rod 19 is rotated, the active bevel tooth 24 rotates and drives the composite shaft 26 to rotate. The threaded section on the composite shaft 26 and the connecting rod mating part 28 cooperate to drive the neodymium magnet 30 to move up and down to adjust its position, thereby adjusting the magnetic attraction force of the shaft pin 11.

[0034] It should be noted that two sets of the up-and-down displacement adjustment kit formed by the active bevel gear 24, driven bevel gear 27, bearing 25, and connecting rod mating part 28 are configured in the upper housing 15 and are symmetrically arranged in the upper housing 15. The upper housing 15 is fixedly provided with a groove for assembling the outer ring of the bearing 25. This allows for more stable and accurate up-and-down adjustment of the sleeve 29 within the longer upper housing 15, and locking is achieved using a threaded pair.

[0035] Preferably, the magnetic attraction part is an electromagnet.

[0036] Preferably, the magnetic force adjustment unit includes a power switch, a controller, and a rectifier module. Magnetic force adjustment is achieved by adjusting the input voltage. The specific structure and adjustment principle are existing technologies and will not be described in detail here.

[0037] Preferably, the top of the upper housing 15 includes a horizontal transition plane 23 and a support surface 21 facing the rubber guide wheel 13, and a secondary chip removal surface 20 facing the grinding wheel 10. The contact position between the grinding wheel 10 and the shaft pin 11 is located above the secondary chip removal surface 20, and the bearing position of the circular runout suppression support plate 14 on the shaft pin 11 is located on the support surface 21.

[0038] Specifically, such as Figure 7 Under the combined action of the rotation direction of the grinding wheel 10 and the rotation direction of the rubber guide wheel 13, the grinding wheel 10 rotates at a higher speed than the rubber guide wheel 13 for rapid grinding, and the generated waste is quickly thrown out along the tangential direction of the contact position between the grinding wheel 10 and the shaft pin 11 (cutting fluid is used in this process).

[0039] Preferably, fluid guide grooves 22 are provided at intervals on the support surface 21, and the depth of the fluid guide grooves 22 is the same as the interval width of the fluid guide grooves 22. This can reduce the contact area between the circular runout suppression support plate 14 and the shaft pin 11, reduce the contact friction, and facilitate the efficient and rapid discharge of cutting fluid, avoiding the cutting fluid from clogging and impacting the shaft pin 11. In addition, when the cutting fluid passes through the fluid guide grooves 22, it comes into contact with the shaft pin 11 during the movement process, which improves its surface lubrication and rapid cooling, which is beneficial to improving the grinding accuracy of the shaft pin 11.

[0040] In practice, the shaft pin 11 to be processed is fed into the processing position. This can be done by using a conventional robotic arm or by using an extended online feeding guide rail in conjunction with a vibratory feeder. After being fed in sequence, the shaft pin 11 passes through the grinding area between the rubber guide wheel 13 and the grinding wheel 10. Here, the rubber guide wheel 13 contacts the side wall of the shaft pin 11, and the shaft pin 11 is driven to rotate by the contact friction. During the rotation of the shaft pin 11, the grinding wheel 10 grinds and polishes the side wall of the shaft pin 11 at a speed several times that of the shaft pin 11.

[0041] During the grinding and polishing process, the magnetic attraction part generates a downward traction force on the shaft pin 11. Under such circumstances, the radial runout of the shaft pin 11 relative to the circular runout suppression support plate 14 is effectively suppressed, and the shaft pin 11 is assisted in positioning without the need for a hard clamp. In particular, in order to reduce the contact friction between the shaft pin 11 and the circular runout suppression support plate 14 increased by the magnetic attraction part, a liquid guide groove 22 is set to reduce the contact area. The liquid guide groove 22 is cleverly used to guide and discharge the cutting fluid. Compared with the prior art where the cutting fluid carries grinding waste and impacts and squeezes between the upper inclined surface of the support plate 12 and the shaft pin 11, this device is more reasonable. It effectively realizes the flow of cutting fluid and also uses the cutting fluid to lubricate and cool the moving shaft pin 11 during the flow of cutting fluid through the liquid guide groove 22.

[0042] The shaft pin 11 rotates and moves axially under the force of the rubber guide wheel 13 until it leaves the grinding area, thus completing the processing.

[0043] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A shaft pin grinding device, characterized in that, include: A centerless grinder, and matching grinding wheel (10) and rubber guide wheel (13); A circular runout suppression support plate (14) is fitted on a centerless grinder and located below the grinding wheel (10) and the rubber guide wheel (13) to support the shaft pin (11); The circular runout suppression support plate (14) is provided with a magnetic attraction part and a magnetic force adjustment part. The magnetic attraction part generates a downward attraction force on the shaft pin (11) placed on the top of the circular runout suppression support plate (14). Under the action of the magnetic attraction force, the shaft pin (11) fits more closely to the circular runout suppression support plate (14) and is suppressed from running out during the subsequent grinding process.

2. The shaft pin grinding device according to claim 1, characterized in that: The circular jump suppression support plate (14) includes an upper shell (15) with a downward opening and a lower sealing plate (17), as well as a rubber waterproof gasket (18) sandwiched between the lower sealing plate (17) and the upper shell (15). The bottom of the upper shell (15) is provided with a flange plate (16), which has a hole and is fixed to the lower sealing plate (17) by bolts. The upper shell (15) is hollow inside for assembling the magnetic attraction part and the magnetic force adjustment part.

3. The shaft pin grinding device according to claim 2, characterized in that: The magnetic attraction part is a strip-shaped permanent magnet. The permanent magnet is embedded in the circular runout suppression support plate (14) and has a designated space for movement. The magnetic force adjustment part restricts the position of the permanent magnet in the space for movement, so as to adjust the distance between the permanent magnet and the top of the circular runout suppression support plate (14).

4. The shaft pin grinding device according to claim 3, characterized in that: The magnetic adjustment unit includes an adjustment rod (19) rotatably disposed within the upper housing (15), with one end of the adjustment rod (19) extending outwards. A bearing (25) is installed inside the upper housing (15), and a composite shaft (26) is installed on the inner ring of the bearing (25). Under the action of the bearing (25), the composite shaft (26) can rotate relative to the adjustment rod (19). An active bevel gear (24) is fixedly provided on the adjustment rod (19), and the composite shaft... (26) The end is fixedly provided with a driven bevel tooth (27), and the driven bevel tooth (24) and the driven bevel tooth (27) mesh. The upper half of the composite shaft (26) is a threaded section. The upper housing (15) is also provided with a sleeve (29) that slides up and down. The upper end of the sleeve (29) is fixedly clamped with a neodymium magnet (30). The lower end face of the sleeve (29) is fixedly provided with a connecting rod mating part (28) with a screw hole. The connecting rod mating part (28) and the threaded section are threadedly mated.

5. The shaft pin grinding device according to claim 2, characterized in that: The magnetic attraction part is an electromagnet.

6. The shaft pin grinding device according to claim 5, characterized in that: The magnetic force adjustment unit includes a power switch, a controller, and a rectifier module, and achieves magnetic force adjustment by adjusting the input voltage.

7. A shaft pin grinding device according to any one of claims 2-6, characterized in that: The top of the upper housing (15) includes a horizontal transition plane (23) and a support surface (21) facing the rubber guide wheel (13), and a secondary chip removal surface (20) facing the grinding wheel (10). The contact position between the grinding wheel (10) and the shaft pin (11) is located above the secondary chip removal surface (20), and the bearing position of the circular runout suppression support plate (14) on the shaft pin (11) is located on the support surface (21).

8. The shaft pin grinding device according to claim 7, characterized in that: Liquid guiding grooves (22) are provided at intervals on the support surface (21), and the depth of the liquid guiding grooves (22) is the same as the interval width of the liquid guiding grooves (22).

Images