Chuck for grinding of index plate

Abstract

The invention provides a fixture for dividing tooth disc grinding, and belongs to the technical field of fixtures. It solves the problem of poor matching precision of dividing tooth disc A and dividing tooth disc B. It comprises a clamping body, the upper side of the clamping body is concave downward, a bulge is arranged in the concave cavity, a positioning member in the form of a ring is fixedly connected in the concave cavity through a fastener and is concentrically arranged with the bulge, the upper end of the positioning member is located outside the concave cavity, the clamping body has an inner abutting part arranged around the outer circumferential side of the bulge in the concave cavity, the upper side of the clamping body is provided with an outer abutting part arranged around the outer circumferential side of the upper end of the positioning member, and the upper end surface of the inner abutting part and the upper end surface of the outer abutting part are both lower than the upper side of the positioning member. It has the advantages of high grinding precision, improved matching precision of dividing tooth disc A and dividing tooth disc B, etc.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of clamps and relates to a clamp for grinding a dividing gear plate. BACKGROUND

[0002] With the rapid development of industrial automation, numerical control lathes are more and more widely used in the mechanical manufacturing industry, and workpieces can be well machined automatically by means of numerical control lathes. In some composite numerical control lathes, a tool turret is arranged, different machining tools are distributed on the outer periphery surface of the tool turret, and the tool turret is rotated to realize the switching function of different machining tools, so that the workpiece can be machined by cooperating with the tool through only one clamping, thereby greatly improving the machining efficiency. The dividing gear plate A and the dividing gear plate B are main dividing components of the tool turret, the dividing gear plate A and the dividing gear plate B are arranged in parallel, and the dividing gear plate B can move as a piston, that is, approach or move away from the dividing gear plate A. When the tool turret needs to be rotated, the dividing gear plate B is separated from the dividing gear plate A, so that the dividing gear plate A can receive power and rotate; after the tool turret is rotated to the position, the dividing gear plate B approaches the dividing gear plate A, the end face teeth on the dividing gear plate B and the end face teeth on the dividing gear plate A are engaged and locked, so that the dividing gear plate A is firmly kept stationary during machining, and the tool turret is also kept stationary.

[0003] The machining precision of the end face teeth of the dividing gear plate A and the end face teeth of the dividing gear plate B determines the matching precision of the two. After the dividing gear plate A and the dividing gear plate B are machined, the two side bevels of the end face teeth on the dividing gear plate A and the two side bevels of the end face teeth on the dividing gear plate B need to be ground to ensure stable matching. Since the structures of the dividing gear plate A and the dividing gear plate B are both special, special grinding clamps such as the grinding positioning mechanism for the dividing gear plate of patent application No. 202210169032.9 are used for clamping and fixing before cooperating with the equipment for grinding. However, in the existing grinding, the dividing gear plate A and the dividing gear plate B are separately ground, and due to the existence of grinding error, the actual matching precision between the ground dividing gear plate A and the dividing gear plate B is not ideal. SUMMARY

[0004] The purpose of the present application is to solve the problem of poor matching precision of the dividing gear plate A and the dividing gear plate B in the prior art.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] The utility model provides a fixture for grinding index gear disc, which comprises a clamping body, the upper side of the clamping body is concave downward, a sleeve is arranged in the concave cavity, characterized in that a positioning member in the form of a ring is fixed to the concave cavity by a fastener, the positioning member is concentric with the sleeve, the upper end of the positioning member is located outside the concave cavity, the clamping body has an inner abutting part around the outer circumferential side of the sleeve in the concave cavity, the upper side of the clamping body is provided with an outer abutting part around the outer circumferential side of the upper end of the positioning member.

[0007] When clamping, the index gear disc B is abutted on the inner abutting part and the inner hole of the index gear disc B is sleeved on the sleeve, the index gear disc A is abutted on the outer abutting part and the inner hole of the index gear disc A is sleeved on the positioning member, and the index gear disc A is centered by the positioning member. After the teeth on the end face of the index gear disc A are aligned with the teeth on the end face of the index gear disc B, the index gear disc B is positioned by expanding the sleeve first, and then the index gear disc A is fixed on the clamping body by the fastener. In this way, the index gear disc B and the index gear disc A are simultaneously positioned and clamped on the clamping body, so that the inclined surfaces of the teeth on the index gear disc A and the index gear disc B can be ground synchronously. Further, the positioning member is fixedly connected in the concave cavity by the fastener, before actual clamping, the positioning member can be dismounted by the staff first, then the clamping body is mounted on the grinding machine, and the upper end face of the outer abutting part and the upper end face of the inner abutting part are ground by the grinding wheel on the grinding machine to ensure that they are coplanar, so that after the index gear disc A is abutted on the inner abutting part and the index gear disc B is abutted on the outer abutting part, the inclined surfaces of the teeth on the index gear disc A and the index gear disc B can be aligned, thereby ensuring the grinding precision. Thus, the inclined surfaces of the teeth on the index gear disc A and the index gear disc B are synchronously ground in an aligned manner, thereby improving the matching precision between the index gear disc A and the index gear disc B after grinding.

[0008] In the fixture for grinding index gear disc, the positioning member comprises a disc body and a ring-shaped positioning part protruding from the upper side of the disc body, the ring-shaped positioning part has a containing cavity between the inner wall and the outer wall of the sleeve, and the upper end of the inner abutting part is located in the containing cavity.

[0009] The disc body is used to realize the mounting and fixing of the positioning member in the concave cavity, and the ring-shaped positioning part is used to realize the actual centering function of the index gear disc A. After the index gear disc B is abutted on the inner abutting part, the index gear disc B is located in the containing cavity between the ring-shaped positioning part and the sleeve, so that interference between the centering of the index gear disc A and the positioning of the index gear disc B can be avoided.

[0010] In the fixture for grinding index gear disc, the inner abutting part comprises a plurality of abutting columns uniformly distributed around the sleeve, the inner diameter of the disc body is slightly larger than the outer diameter of the sleeve, and the disc body is provided with a plurality of accommodation holes through which the abutting columns pass.

[0011] The inner diameter of the disc body is slightly larger than the outer diameter of the expansion sleeve. The center hole of the disc body can limit the expansion angle of the expansion sleeve to avoid deformation caused by excessive expansion angle, which can cause ineffective expansion. By setting the inner abutting part to include a plurality of abutting columns uniformly distributed around the expansion sleeve, the effective contact area between the inner abutting part and the index tooth disc B can be ensured to be as large as possible while not being limited by the disc body.

[0012] In the above-mentioned fixture for grinding the index tooth disc, the recess is a circular cavity, and the outer peripheral wall of the disc body abuts against the inner peripheral wall of the recess.

[0013] The recess is a circular cavity, and the outer peripheral wall of the disc body abuts against the inner peripheral wall of the recess, which can ensure the concentricity between the positioning member and the expansion sleeve, and further ensure the concentricity of the index tooth disc B and the index tooth disc A after installation and fixation, thereby improving the precision of synchronous grinding.

[0014] In the above-mentioned fixture for grinding the index tooth disc, the outer abutting part is a ring-shaped protrusion, or the outer abutting part includes a plurality of protrusions uniformly distributed around the positioning member.

[0015] In the above-mentioned fixture for grinding the index tooth disc, the outer abutting part is provided with a plurality of threaded positioning holes in the vertical direction.

[0016] In practice, a number of process holes corresponding to the threaded positioning holes are provided on the index tooth disc A. After the center of the index tooth disc A is confirmed by the positioning member, the index tooth disc A is fixed on the fixture body by using fasteners to pass through the process holes on the index tooth disc A and threadedly connect into the threaded positioning holes.

[0017] In the above-mentioned fixture for grinding the index tooth disc, the side part of the fixture body is detachably connected with a guide block, the guide block is slidingly connected with a long strip-shaped sliding block in the vertical direction, the upper end of the sliding block is vertically fixed with a long strip-shaped alignment block on the side of the center line of the expansion sleeve, the lower side of the alignment block is provided with an isosceles trapezoidal alignment groove, the alignment groove is distributed along the length direction of the alignment block, the alignment block has two contact strips protruding from the two side groove walls of the alignment groove and distributed along the length direction of the alignment block, and the surface of the contact strip is a cylindrical curved surface.

[0018] After the index tooth disc B abuts against the inner abutting part and the index tooth disc A abuts against the outer abutting part, the guide block is connected to the side part of the fixture body (it can also be connected in advance), then the sliding block is connected to the guide block and moved downward, the alignment block moves downward, and the teeth on the end surface of the index tooth disc B and the teeth on the end surface of the index tooth disc A are simultaneously clamped into the alignment groove and simultaneously contact the surfaces of the two contact strips in the alignment groove to complete the alignment work. By setting such an alignment structure, the alignment work of the teeth on the end surface of the index tooth disc B and the teeth on the end surface of the index tooth disc A can be easily completed with high precision and small error, thereby ensuring the precision of synchronous grinding.

[0019] Moreover, the alignment groove is directly aligned with the teeth, so even if the number of teeth is different due to the different division angles [here, the number of teeth refers to the number of teeth on the same index disc (eight teeth, twelve teeth), not the number of teeth on index disc A and the number of teeth on index disc B, because index disc A and index disc B are used together, for example, when the number of teeth on index disc A is eight, the number of teeth on index disc B used is also eight], the same alignment structure can be used, because in the case of different number of teeth, the space between the two adjacent teeth on the index disc becomes larger, but the tooth profile of each tooth does not change significantly.

[0020] In the above-mentioned fixture for grinding index disc, the sliding block is integrally connected with the alignment block, and the alignment groove penetrates through the side wall of the sliding block away from the center line of the expansion sleeve.

[0021] The alignment groove is arranged to directly penetrate through the side wall of the sliding block away from the center line of the expansion sleeve, so that the worker can directly observe the alignment of the teeth on index disc A and the teeth on index disc B from the side of the sliding block away from the center line of the expansion sleeve, ensuring the alignment accuracy, and thus ensuring that synchronous grinding can be achieved using the fixture.

[0022] Compared with the prior art, the fixture for grinding index disc, based on the expansion sleeve, through the arrangement of the inner abutting portion, the positioning member and the outer abutting portion, realizes the clamping and fixing of index disc A and index disc B on the same fixture body and thus achieves synchronous grinding, thereby greatly improving the matching accuracy between index disc A and index disc B after grinding. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the first embodiment of the fixture for grinding index disc.

[0024] Figure 2 is a sectional view of the fixture for grinding index disc.

[0025] Figure 3 is an exploded view between the positioning member and the fixture body.

[0026] Figure 4 is a structural schematic view of the sliding block.

[0027] Figure 5 is a schematic view of the fixture for grinding index disc after clamping index disc A and index disc B.

[0028] Figure 6 is a sectional view of the fixture for grinding index disc after clamping index disc A and index disc B.

[0029] In the figure, 1, clamp body; 1a, concave cavity; 1b, inner abutting part; 1b1, abutting column; 1c, outer abutting part; 1c1, threaded positioning hole; 1d, guide part; 1e, main body; 1f, mandrel; 2, expansion sleeve; 2a, matching part; 3, positioning member; 3a, disc body; 3a1, accommodation hole; 3b, annular positioning part; 4, pull rod; 4a, protruding part; 5, guide block; 6, sliding block; 7, alignment block; 7a, alignment groove; 7b, contact strip; 8, base; 8a, oil passing hole; 8b, annular oil passing groove; 9, cavity; 10, piston; 11, cylinder body; 11a, oil inlet hole; 12, index disc A; 13, index disc B. DETAILED DESCRIPTION

[0030] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the accompanying drawings, but the present application is not limited to these embodiments.

[0031] Example One

[0032] As shown in Figure 1 , Figure 2 and Figure 3 , the clamp for grinding the index disc includes a clamp body 1, the upper side of the clamp body 1 has a downwardly concave concave cavity 1a, and the concave cavity 1a is provided with an expansion sleeve 2. The concave cavity 1a is fixedly connected with a positioning member 3 in the form of a ring and concentrically arranged with the expansion sleeve 2 through fasteners, the upper end of the positioning member 3 is located outside the concave cavity 1a, the clamp body 1 has a plurality of inner abutting parts 1b arranged around the outer circumferential side of the expansion sleeve 2 in the concave cavity 1a, and the upper side of the clamp body 1 is provided with an outer abutting part 1c arranged around the outer circumferential side of the upper end of the positioning member 3. The upper end faces of the inner abutting parts 1b and the outer abutting part 1c are both lower than the upper side of the positioning member 3. Specifically, the positioning member 3 includes a disc body 3a and an annular positioning part 3b protruding from the upper side of the disc body 3a, the disc body 3a is fixedly connected in the concave cavity 1a through fasteners, and the annular positioning part 3b is integrally connected with the disc body 3a. The inner wall of the annular positioning part 3b and the outer wall of the expansion sleeve 2 have a receiving cavity therebetween, the inner diameter of the annular positioning part 3b is designed to be slightly larger than the outer diameter of the index disc B13, and the upper end of the inner abutting part 1b is located in the receiving cavity. The concave cavity 1a is a circular cavity, and the outer circumferential wall of the disc body 3a abuts against the inner circumferential wall of the concave cavity 1a. The inner diameter of the disc body 3a is slightly larger than the outer diameter of the expansion sleeve 2, the inner abutting part 1b includes a plurality of abutting columns 1b1 uniformly distributed around the expansion sleeve 2, the number of the abutting columns 1b1 is specifically eight, and the disc body 3a has a plurality of accommodation holes 3a1 for the abutting columns 1b1 to pass through. The outer abutting part 1c is annular and protruding, and the outer abutting part 1c is provided with a plurality of threaded positioning holes 1c1 in the vertical direction.

[0033] In this embodiment, as shown in Figure 1 and Figure 2As shown, the clamping body 1 has a guide portion 1d in the shape of a truncated cone at the center of the cavity 1a, and the expansion sleeve 2 is sleeved on the guide portion 1d. The inner wall of the expansion sleeve 2 and the outer wall of the guide portion 1d have the same taper and form an abutment. A pull rod 4 is arranged in the guide portion 1d, the upper end of the pull rod 4 is located outside the guide portion 1d, and a limiting groove is arranged on the outer circumferential side of the guide portion 1d. The upper end of the pull rod 4 is provided with a protruding portion 4a, the lower side wall of the protruding portion 4a is the upper side wall of the limiting groove, and the outer diameter of the protruding portion 4a is substantially the same as the outer diameter of the expansion sleeve 2. The clamping body 1 includes a substantially disc-shaped main body 1e and a mandrel 1f fixedly connected to the lower side of the main body 1e. The cavity 1a is arranged on the main body 1e, and the guide portion 1d is the upper end portion of the mandrel 1f. The bottom of the disc body 3a has a plurality of water leakage grooves arranged along the radial direction thereof, and each water leakage groove is in communication with the central hole of the disc body 3a. A plurality of drainage grooves corresponding to the water leakage grooves are arranged in the main body 1e of the clamping body 1. The drainage grooves are arranged obliquely, the upper ends of the drainage grooves are in communication with the corresponding water leakage grooves, and the lower ends of the drainage grooves penetrate the side of the main body 1e.

[0034] Further, as shown in Figure 1 , Figure 2 and Figure 4 , the side of the clamping body 1 is detachably connected with a guide block 5. The guide block 5 is slidingly connected with a long strip-shaped sliding block 6 in the vertical direction. The upper end of the sliding block 6 is fixedly connected with a long strip-shaped alignment block 7 on the side close to the center line of the expansion sleeve 2. The lower side of the alignment block 7 is provided with an isosceles trapezoidal alignment groove 7a distributed along the length direction of the alignment block 7. The alignment block 7 has two contact strips 7b protruding from the two side walls of the alignment groove 7a and distributed along the length direction of the alignment block 7. The surface of the contact strip 7b is a cylindrical curved surface. The sliding block 6 and the alignment block 7 are integrally fixedly connected, and the alignment groove 7a penetrates the side wall of the sliding block 6 away from the center line of the expansion sleeve 2.

[0035] In practice, as shown in Figure 1 and Figure 2 , the clamping device for grinding the graduated toothed disc further includes a base 8. The mandrel 1f is fixedly connected to the upper end of the base 8. A cavity 9 is formed between the base 8 and the mandrel 1f. A piston 10 is arranged in the cavity 9 to divide the cavity 9 into two parts. The lower end of the pull rod 4 is fixedly connected to the piston 10. A cylinder 11 is sleeved on the outside of the base 8. Bearings are arranged between the cylinder 11 and the mandrel 1f and between the cylinder 11 and the base 8. Two oil inlet holes 11a are arranged on the side of the cylinder 11. Two oil passing holes 8a are arranged on the side of the base 8. One of the oil passing holes 8a is in communication with the upper part of the cavity 9, and the other oil passing hole 8a is in communication with the lower part of the cavity 9. Annular oil passing grooves 8b corresponding to the two oil passing holes 8a are arranged on the outer circumferential side of the base 8. The two oil inlet holes 11a are in communication with the two annular oil passing grooves 8b.

[0036] In use, the base 8 is fixedly connected to the rotary worktable, and the two oil inlets 11a are respectively connected to the connecting oil circuit. An anti-rotation bracket is used to position the cylinder body 11 to ensure it remains stationary. During clamping, if... Figure 5 and Figure 6 As shown, firstly, the indexing gear plate B13 is fitted over the expansion sleeve 2 and abuts against each of the abutting posts 1b1. Then, the indexing gear plate A12 is abutted against the outer abutting part 1c and centered using the annular positioning part 3b of the positioning member 3. Next, the teeth on the indexing gear plate A12 are aligned with the teeth on the indexing gear plate B13 using the alignment block 7. Specifically, this is achieved using the isosceles trapezoidal alignment groove 7a located on the lower side of the alignment block 7. The alignment structure needs to be removed from the fixture 1 during grinding. Then, pressure is supplied to the upper part of the cavity 9 through one of the oil inlet holes 11a, causing the piston 10 to move downwards with the pull rod 4. This causes the expansion sleeve 2 to move downwards and, with the aid of its tapered shape, expands outwards and tightens against the inner wall of the indexing gear plate B13. Finally, the indexing gear plate A12 is fixedly connected to the outer abutting part 1c by fasteners and threaded positioning holes 1c1. Before actual clamping, the operator can first remove the positioning component 3, then install the fixture body 1 onto the grinding machine. The grinding wheel on the machine simultaneously grinds the upper surfaces of both the outer abutment part 1c and the inner abutment part 1b to ensure they are coplanar. This ensures that after the indexing gear plate A12 abuts against the inner abutment part 1b and the indexing gear plate B13 abuts against the outer abutment part 1c, the inclined surfaces of the teeth on the indexing gear plate A12 are aligned with the inclined surfaces of the teeth on the indexing gear plate B13, thus ensuring grinding accuracy. In this way, the indexing gear plate B13 and the indexing gear plate A12 are simultaneously positioned and clamped on the fixture body 1, allowing for synchronous grinding of the inclined surfaces of the teeth on both plates, thereby significantly improving the fit accuracy between the ground indexing gear plate A12 and the indexing gear plate B13. After grinding one tooth, the worktable is rotated to switch to the grinding position of another tooth by rotating the fixture 1.

[0037] Example 2

[0038] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the outer abutment 1c includes a number of protrusions evenly distributed around the positioning member 3.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A jig for grinding indexing gear discs, comprising a jig body (1), wherein the jig body (1) has a downwardly recessed cavity (1a) on its upper side, and an expansion sleeve (2) is provided inside the cavity (1a), characterized in that, A positioning element (3) in the concave cavity (1a) is fixedly connected to the cavity by fasteners. The positioning element (3) is located outside the concave cavity (1a). The clamping body (1) is located inside the concave cavity (1a) and has an inner abutment (1b) arranged around the outer periphery of the expansion sleeve (2). The upper side of the clamping body (1) is provided with an outer abutment (1c) arranged around the outer periphery of the upper end of the positioning element (3). The upper end face of the outer abutment (1c) is provided with a plurality of threaded positioning holes (1c1) along the circumferential direction. The upper end face of the inner abutment (1b) and the upper end face of the outer abutment (1c) are both lower than the upper edge of the positioning element (3). The expansion sleeve (2) is higher than the inner abutment (1b). The upper end face of the inner abutment (1b) is flush with the upper end face of the outer abutment (1c).

2. The fixture for grinding indexing gear discs according to claim 1, characterized in that, The positioning element (3) includes a disc body (3a) and an annular positioning part (3b) protruding from the upper side of the disc body (3a). The inner wall of the annular positioning part (3b) and the outer wall of the expansion sleeve (2) have a receiving cavity, and the upper end of the inner abutment part (1b) is located in the receiving cavity.

3. The fixture for grinding indexing gear discs according to claim 2, characterized in that, The inner abutment part (1b) includes several abutment posts (1b1) evenly distributed around the expansion sleeve (2). The inner diameter of the disc body (3a) is slightly larger than the outer diameter of the expansion sleeve (2). The disc body (3a) is provided with several clearance holes (3a1) for the abutment posts (1b1) to pass through.

4. The fixture for grinding indexing gear discs according to claim 3, characterized in that, The cavity (1a) is a circular cavity, and the outer peripheral wall of the disk (3a) is in contact with the inner peripheral wall of the cavity (1a).

5. The fixture for grinding indexing gear discs according to claim 1, 2, 3, or 4, characterized in that, The outer abutment (1c) is an annular protrusion, or the outer abutment (1c) includes a number of protrusions evenly distributed around the positioning member (3).

6. The fixture for grinding indexing gear discs according to claim 1, 2, 3, or 4, characterized in that, The clamping body (1) is detachably connected to a guide block (5) on its side. The guide block (5) is slidably connected to a long strip-shaped sliding block (6) in the vertical direction. The upper end of the sliding block (6) is vertically fixed to a long strip-shaped alignment block (7) on the side near the center line of the expansion sleeve (2). The lower side of the alignment block (7) is provided with an isosceles trapezoidal alignment groove (7a). The alignment groove (7a) is distributed along the length direction of the alignment block (7). The alignment block (7) has two contact strips (7b) that protrude from the two sides of the alignment groove (7a) and are distributed along the length direction of the alignment block (7). The surface of the contact strip (7b) is a cylindrical curved surface.

7. The fixture for grinding indexing gear discs according to claim 6, characterized in that, The sliding block (6) and the alignment block (7) are integrally fixed together, and the alignment groove (7a) penetrates the side wall of the sliding block (6) away from the center line of the expansion sleeve (2).

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