Split clamp for double-sided face grinding apparatus

Abstract

The application relates to a split type clamp for a double-end-face grinding device, which comprises a supporting part, a clamp body and a driving mechanism, the clamp body comprises a rotating ring, a clamp disc for placing a workpiece and a transmission connecting piece, the rotating ring is rotationally connected in an assembly hole of the supporting part, the clamp disc is coaxially gap-fitted with a ring cavity of the rotating ring, the transmission connecting piece is located in the gap and movably and detachably connected with one end of the rotating ring, and the other end is fixed with the clamp disc, so that the clamp disc has an axial deflection amount, and the driving mechanism is installed on the supporting part and transmissionally connected with the driving end of the rotating ring to drive the rotating ring to rotate and drive the clamp disc to rotate. The split type design of the rotating ring for transmission and the clamp disc for fixing the workpiece solves the technical problem that the traditional double-face-end grinding clamp disc is not suitable for workpieces with a large height-diameter ratio and a large planar grinding allowance.

Description

Technical Field

[0001] This invention relates to the field of grinding fixtures, and more specifically to a split fixture for a double-end grinding machine. Background Technology

[0002] Double-end grinding machines are high-efficiency surface grinding machines, mainly composed of upper and lower grinding wheels, a feed pan, and a clamping pan. They grind two parallel end faces simultaneously in one machining process, resulting in high processing efficiency. Therefore, they are widely used in the surface grinding processing industry for bearings, bushings, and other products.

[0003] However, in actual processing, the workpiece is subjected to grinding forces from the upper and lower grinding wheel end faces within the fixture, and the upper and lower grinding wheels rotate in opposite directions, resulting in opposite grinding forces. When processing workpieces with a large height-to-diameter ratio using conventional clamping methods, the overturning moment experienced by the workpiece within the fixture becomes greater. After grinding, this often results in excessive changes in the inclination of the generatrix of the inner and outer diameter surfaces of the workpiece relative to the workpiece end face. In other words, the perpendicularity of the workpiece after planar machining exceeds the process range, which in turn makes it difficult to guarantee the machining accuracy of the workpiece in subsequent processing, leading to a decrease in the machining pass rate, a decrease in production efficiency, and a serious restriction on large-scale industrial applications.

[0004] Existing double-end face grinding machine feed tray structures only optimize the lifespan of the feed plate, the lifespan of the fixture tray, and the height and size range of the workpiece. They pay little attention to whether the dimensions and positions of the workpiece after machining meet requirements. This is especially problematic for workpieces with large aspect ratios and significant surface grinding allowances, such as carbide bearings and bushings. Excessive perpendicularity deviations after machining severely impact subsequent production, failing to leverage the high efficiency of double-end face grinding. Furthermore, existing double-end face fixture trays are all manufactured as a single piece, resulting in large dimensions and high precision, leading to correspondingly high manufacturing costs and inconvenient or slow fixture tray replacement.

[0005] Therefore, how to provide a new split-type jig disc for double-end grinding equipment that is suitable for grinding parts with a large height-to-diameter ratio while reducing the cost of using the jig disc is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a split fixture for a double-end grinding machine, which aims to solve the technical problem that the traditional double-end grinding fixture is not suitable for workpieces with a large height-to-diameter ratio and a large surface grinding allowance.

[0007] A split-type fixture for a double-end grinding machine, the double-end grinding machine having an upper grinding wheel and a lower grinding wheel arranged opposite each other and horizontally; comprising:

[0008] The fixture body includes a support, a rotating ring, a fixture disk for placing workpieces, and a transmission connector. The support has an assembly hole at one end corresponding to the upper and lower grinding wheel disks. The rotating ring is rotatably connected in the assembly hole, and the fixture disk and the ring cavity of the rotating ring are coaxially clearance-fitted. The transmission connector is located in the clearance and has one end movable and detachably connected to the rotating ring, while the other end is fixed to the fixture disk, so that the fixture disk has an axial deflection.

[0009] The drive mechanism is mounted on the support and its drive end is connected to the rotating ring to drive the rotating ring to rotate the clamping disc.

[0010] Through the above technical solution, the present invention drives the rotating ring to rotate via a servo motor, and then drives the fixture disk to rotate via a transmission connector. When the workpiece is subjected to opposite grinding forces from the upper and lower grinding wheels, it rotates within the fixture disk and moves in a circular motion with the fixture disk. Because the outer wall of the fixture disk is fitted with the ring cavity of the rotating ring, the lower surface of the fixture disk is always in contact with the upper grinding surface of the lower grinding wheel during the rotation of the rotating ring, and is not affected by the axial deflection during the rotation of the rotating ring. This keeps the workpiece fixed in the fixture disk in a vertical state. As a result, the force and removal allowance of the two end faces of the workpiece are more uniform during the grinding process. Moreover, compared with the integral fixture disk, the area of ​​the high-precision area that needs to be guaranteed is smaller when the rotating ring and the fixture disk are arranged separately, which reduces the manufacturing cost of the fixture disk. It is suitable for workpieces with a large height-to-diameter ratio and a large surface grinding allowance, and has the characteristics of low manufacturing cost.

[0011] Preferably, the inner ring surface of the rotating ring has a movable groove, and the outer ring surface of the rotating ring has teeth; the transmission connecting component is a transmission connecting block, which is fastened to the outer ring surface of the clamping disc and is movable with the movable groove and can be transmitted through it.

[0012] The drive mechanism includes a worktable, which is located on one side of the double-end grinding machine;

[0013] The servo motor has its fixed end securely connected to the worktable, and its power output end is securely connected to a gear disk that meshes with teeth for transmission.

[0014] Preferably, the fixture disk has multiple positioning holes evenly distributed on it.

[0015] Preferably, the upper and lower surfaces of the clamping disc are provided with multiple chip removal grooves radiating outwards from the center of the disc.

[0016] Preferably, each chip removal groove is arc-shaped.

[0017] Preferably, it also includes a support ring, which is coaxially arranged with the assembly hole. The upper surface of the support ring is fastened to the lower surface of the support part, and a limiting ring is fastened to the bottom end of the rotating ring. The outer ring surface of the limiting ring is rotatably connected to the inner ring surface of the support ring.

[0018] Preferably, the maximum outer contour of the rotating ring tooth is clearance-fitted with the assembly hole.

[0019] Preferably, there are three movable slots, which are evenly arranged along the circumference of the rotating ring, and three transmission connecting blocks, which are evenly arranged along the circumference of the clamping disk and are all fastened to the outer ring surface of the clamping disk.

[0020] Preferably, the upper and lower surfaces of the fixture disc are both located within the grinding range of the upper and lower grinding wheels.

[0021] Preferably, it also includes a transmission wheel, which is rotatably connected to the table surface of the worktable, and a gear disk that is fastened to the power output end of the servo motor is connected to the rotating ring through the tooth transmission of the transmission wheel.

[0022] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a split fixture for a double-end grinding equipment, which has the following beneficial effects: the fixture disk and the rotating ring are coaxially clearance-fitted, and even if the rotating ring undergoes some axial overturning during rotation, the displacement caused by these overturning amounts will be absorbed by the gap between the two, so as not to affect the horizontal rotation of the fixture disk. Attached Figure Description

[0023] Figure 1 A three-dimensional schematic diagram of a split-type fixture for a double-end grinding machine provided by the present invention;

[0024] Figure 2 A three-dimensional schematic diagram of a split-type fixture for a double-end grinding machine (after removing the upper grinding disc) provided by the present invention;

[0025] Figure 3 for Figure 2 A magnified view of a section at point A;

[0026] Figure 4 A top view of a split-type fixture for a double-end grinding machine (after removing the upper grinding disc) provided by the present invention;

[0027] Figure 5 for Figure 4 BB section view;

[0028] Figure 6 for Figure 5 A magnified view of section C;

[0029] Figure 7 An exploded schematic diagram of the clamping device provided by the present invention;

[0030] Figure 8 A three-dimensional schematic diagram of the support portion provided by the present invention;

[0031] Figure 9 A three-dimensional schematic diagram of the rotating ring provided by the present invention;

[0032] Figure 10 A three-dimensional schematic diagram of the clamping disk provided by the present invention.

[0033] Wherein: 1-Double-end grinding equipment; 2-Worktable; 3-Clamping body; 4-Servo motor; 6-Transmission wheel; 11-Upper grinding wheel; 12-Lower grinding wheel; 31-Support part; 32-Rotating ring; 33-Clamping disc; 34-Supporting ring; 311-Assembly hole; 321-Modular groove; 322-Limiting ring; 331-Transmission connecting block; 332-Positioning hole; 333-Cutter removal groove. Detailed Implementation

[0034] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0035] See appendix Figure 1-10 This invention discloses a split-type fixture for a double-end grinding machine. The double-end grinding machine 1 has an upper grinding wheel 11 and a lower grinding wheel 12 arranged opposite to each other and horizontally; it includes: a fixture body 3 and a driving mechanism.

[0036] The fixture body 3 includes a support part 31, a rotating ring 32, a fixture disk 33 for placing workpieces, and a transmission connector; the support part 31 has an assembly hole 311 at one end corresponding to the upper grinding wheel disk 11 and the lower grinding wheel disk 12; the rotating ring 32 is rotatably connected in the assembly hole 311, and the fixture disk 33 is coaxially clearance-fitted with the annular cavity of the rotating ring 32; the transmission connector is located in the clearance and is movable at one end and detachably connected to the rotating ring 32, and the other end is fixed to the fixture disk 33 so that the fixture disk 33 has an axial deflection amount;

[0037] The drive mechanism is mounted on the support 31 and its drive end is connected to the rotating ring 32 to drive the rotating ring 32 to rotate the clamping disk 33.

[0038] In some embodiments, the inner ring surface of the rotating ring 32 is provided with a movable groove 321, and the outer ring surface of the rotating ring 32 has teeth; the transmission connecting member is a transmission connecting block 331, which is fastened to the outer ring surface of the clamping disk 33 and is movable and capable of transmission connection with the movable groove 321.

[0039] The drive mechanism includes a worktable 2, which is located on one side of the double-end grinding machine 1;

[0040] Servo motor 4, the fixed end of servo motor 4 is fastened to workbench 2, and the power output end of servo motor 4 is fastened to a gear disk that meshes with teeth for transmission.

[0041] In other embodiments, a plurality of positioning holes 332 are evenly provided on the clamping disk 33.

[0042] Specifically, the gap between the workpiece to be ground and the positioning hole 332 is generally between 0.15mm and 0.25mm.

[0043] More specifically, the thickness of the clamping disc 33 is greater than the distance between the bottom end of the rotating ring 32 and the lower grinding wheel disc 12. This prevents the transmission connecting block 331 of the clamping disc 33 from disengaging from the movable groove 321.

[0044] In one embodiment, the upper and lower surfaces of the fixture disk 33 are provided with multiple radiating grooves 333 extending from the center of the disk surface. This facilitates the discharge of grinding fluid and grinding particles, prevents grinding products from accumulating in the positioning holes, and improves the machining accuracy of the product grinding.

[0045] In one embodiment, a single discharge groove 333 is arc-shaped. Therefore, as the jig disk 33 rotates, the grinding products are discharged more quickly along the direction of rotation.

[0046] In some embodiments, a support ring 34 is further included. The support ring 34 is coaxially arranged with the mounting hole 311. The upper surface of the support ring 34 is fastened to the lower surface of the support portion 31. A limiting ring 322, coaxially arranged, is fastened to the bottom end of the rotating ring 32. The outer ring surface of the limiting ring 322 is rotatably connected to the inner ring surface of the support ring 34. Thus, the rotation of the rotating ring 32 is limited by the support ring 35.

[0047] In this embodiment, the maximum outer contour of the teeth of the rotating ring 32 is clearance-fitted with the assembly hole 311.

[0048] Specifically, the gap between the maximum outer contour of the rotating ring 32 teeth and the inner wall of the mounting hole 311 is between 1 and 2 mm.

[0049] This avoids interference between the teeth of the rotating ring 32 and the inner wall of the mounting hole 311.

[0050] In some specific embodiments, there are three movable slots 321, which are evenly arranged along the circumference of the rotating ring 32, and three transmission connecting blocks 331, which are evenly arranged along the circumference of the clamping disk 33 and are all fastened to the outer ring surface of the clamping disk 33.

[0051] In some other specific embodiments, the upper and lower surfaces of the clamping disk 33 are both located within the grinding range of the upper grinding wheel disk 11 and the lower grinding wheel disk 12.

[0052] In some other specific embodiments, a transmission wheel 6 is also included, which is rotatably connected to the table surface of the worktable 2, and the gear disk that is fastened to the power output end of the servo motor 4 is connected to the tooth transmission of the rotating ring 32 through the transmission wheel 6.

[0053] Specifically, in the manufacturing process of fixture body 3, we can utilize worn and scrapped fixture discs and use wire electrical discharge machining to process the rotating ring 32 and fixture disc 33 simultaneously according to the dimensions given in the drawings. The gap between the rotating ring 32 and fixture disc 33 should be between 0.25mm and 0.35mm. Alternatively, it can be manufactured according to the dimensions of fixture disc 33. The manufacturing method is to first use wire cutting technology to process the outer dimensions of fixture disc 33, including the transmission connecting block 331, on a plate of specified thickness. Then, multiple positioning holes 332 on fixture disc 33 can be machined using milling. The number of positioning holes 332 is set according to the product size. Finally, the chip removal grooves 333 on the upper and lower surfaces of the positioning holes 332 are machined using milling.

[0054] The manufacturing of the clamping disc 33 of the present invention belongs to the recycling of scrapped integral clamping disc bodies, which is conducive to the reuse of resources.

[0055] Manufacturing of rotating ring 32: The rotating ring 32 is processed according to the dimensions in the drawing. First, the outer gear of the fixture is machined by milling, and then the inner hole is machined by wire cutting. A corresponding movable groove 321 is left to cooperate with the fixture disk 33. In order to improve the service life of the rotating ring 32, the rotating ring 32 also needs to be heat treated to improve its hardness and wear resistance.

[0056] When changing the processing product model, the split fixture disclosed in this invention only requires replacing the fixture disk 33, without disassembling and assembling the rotating ring 32. This simplifies the operation, improves the efficiency of product changeover, and reduces the labor intensity of personnel.

[0057] The specific principle and usage method of the split-type fixture for a double-end-face grinding equipment provided in this embodiment are as follows:

[0058] During the grinding process of the product, due to the coaxial clearance fit between the clamping disk 33 and the rotating ring 32, even if the rotating ring 32 tilts axially during rotation, the displacement caused by these tilts will be absorbed by the gap between them. Therefore, during the rotation of the rotating ring 32, the lower surface of the clamping disk 33 is always in contact with the upper grinding surface of the lower grinding wheel disk 12, and is not affected by the axial deflection during the rotation of the rotating ring 32. This keeps the workpiece fixed in the clamping disk 33 in a vertical state. As a result, the force and removal amount on the two end faces of the workpiece are more uniform during the grinding process.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Split clamp for a double-disc grinding machine, the double-disc grinding machine (1) having an upper grinding disc (11) and a lower grinding disc (12) arranged opposite and horizontally; characterized in that, include: The fixture body (3) includes a support part (31), a rotating ring (32), a fixture disk (33) for placing workpieces, and a transmission connector. The support part (31) has an assembly hole (311) at one end corresponding to the upper grinding wheel disk (11) and the lower grinding wheel disk (12). The rotating ring (32) is rotatably connected in the assembly hole (311), and the fixture disk (33) is coaxially clearance-fitted with the ring cavity of the rotating ring (32). The transmission connector is located in the clearance and has one end movable and detachably connected to the rotating ring (32), and the other end fixed to the fixture disk (33) so that the fixture disk (33) has an axial deflection. A drive mechanism is mounted on the support (31) and its drive end is connected to the rotating ring (32) to drive the rotating ring (32) to rotate the clamping disk (33); The inner ring surface of the rotating ring (32) is provided with a movable groove (321), and the outer ring surface of the rotating ring (32) has teeth; the transmission connector is a transmission connector block (331), which is fastened to the outer ring surface of the clamping disk (33) and is movable and can be transmitted with the movable groove (321). The drive mechanism includes a worktable (2), which is located on one side of the double-end grinding equipment (1); Servo motor (4), the fixed end of the servo motor (4) is fastened to the worktable (2), and the power output end of the servo motor (4) is fastened to a gear disk that meshes with the teeth for transmission. It also includes a support ring (34), which is coaxially arranged with the assembly hole (311). The upper surface of the support ring (34) is fastened to the lower surface of the support part (31). The bottom end of the rotating ring (32) is fastened to a coaxially arranged limiting ring (322), and the outer ring surface of the limiting ring (322) is rotatably connected to the inner ring surface of the support ring (34).

2. The split clamp for a double disc grinding apparatus according to claim 1, wherein The clamping disc (33) is provided with a plurality of positioning holes (332) evenly distributed on it.

3. The split-type fixture for a double-end face grinding machine according to claim 1, characterized in that, The upper and lower surfaces of the clamping disc (33) are provided with multiple chip removal grooves (333) radiating outward from the center of the disc surface.

4. The split-type fixture for a double-end face grinding machine according to claim 3, characterized in that, Each of the said chip removal grooves (333) is arc-shaped.

5. The split-type fixture for a double-end face grinding machine according to claim 1, characterized in that, The maximum outer contour of the teeth of the rotating ring (32) is clearance-fitted with the assembly hole (311).

6. The split-type fixture for a double-end face grinding machine according to claim 1, characterized in that, The number of the movable grooves (321) is three, which are evenly arranged around the circumference of the rotating ring (32). The number of the transmission connecting blocks (331) is three, which are evenly arranged around the circumference of the clamping disk (33) and are all fastened to the outer ring surface of the clamping disk (33).

7. The split-type fixture for a double-end face grinding machine according to claim 1, characterized in that, The upper and lower surfaces of the clamping disc (33) are both located within the grinding range of the upper grinding wheel disc (11) and the lower grinding wheel disc (12).

8. A split-type fixture for a double-end face grinding machine according to claim 1, characterized in that, It also includes a transmission wheel (6), which is rotatably connected to the table surface of the worktable (2), and the gear disk that is fastened to the power output end of the servo motor (4) is connected to the rotating ring (32) through the tooth transmission of the transmission wheel (6).

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