A tooling fixture for grinding indexing gear discs

Abstract

This invention provides a tooling fixture for grinding indexing gear discs, belonging to the field of fixture technology. It solves the problem of poor fit accuracy between indexing gear disc A and indexing gear disc B. It includes a fixture body and a tensioning component. The fixture body has a guide portion on its upper side. The tensioning component includes a first tensioning portion, which is annular and sleeved outside the guide portion. The tensioning component has several elongated deformation grooves on the side of the first tensioning portion. The tensioning component also includes a second tensioning portion, which is annular and concentrically arranged with the first tensioning portion, and a connecting portion fixed between the lower end of the first tensioning portion and the lower end of the second tensioning portion. Each deformation groove is partially located on the second tensioning portion. The fixture body has an outer abutment portion surrounding the outer side of the second tensioning portion and an inner abutment portion passing through the connecting portion and surrounding the outer side of the first tensioning portion. The upper end of the inner abutment portion is flush with the upper end of the outer abutment portion. It has advantages such as fast clamping speed, high grinding accuracy, and significantly improved fit accuracy between indexing gear disc A and indexing gear disc B.

Description

Technical Field

[0001] This invention belongs to the field of fixture technology and relates to a tooling fixture for grinding indexing gear discs. Background Technology

[0002] With the rapid development of industrial automation, CNC lathes are increasingly widely used in the machinery manufacturing industry. Workpieces can now be processed automatically using CNC lathes. Some composite CNC lathes are equipped with a tool turret, on which different machining tools are distributed. By rotating the tool turret to switch between different cutting tools, the workpiece can be processed through several steps with only one clamping, greatly improving machining efficiency. Indexing gear A and indexing gear B are the main indexing components of the tool turret. Indexing gear A and indexing gear B are arranged in parallel, and indexing gear B can move like a piston, that is, move closer to or away from indexing gear A. When the tool turret needs to rotate, indexing gear B separates from indexing gear A, allowing indexing gear A to receive power and rotate. When the tool turret has rotated to the correct position, indexing gear B moves closer to indexing gear A, and the end face teeth on indexing gear B mesh and lock with the end face teeth on indexing gear A, so that indexing gear A remains firmly stationary during machining, thereby keeping the tool turret stationary.

[0003] The machining accuracy of the end face teeth of indexing gear A and indexing gear B determines their fit accuracy. After indexing gear A and indexing gear B are machined, the inclined surfaces on both sides of the end face teeth on indexing gear A and indexing gear B need to be ground to ensure a stable fit. Because the structures of indexing gear A and indexing gear B are relatively special, special grinding fixtures, such as the indexing gear grinding positioning mechanism described in patent application number 202210169032.9, are used to clamp and fix them before grinding. However, in existing grinding processes, indexing gear A and indexing gear B are ground separately. Due to grinding errors, the actual fit accuracy achieved between the ground indexing gear A and indexing gear B is not ideal. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a tooling fixture for grinding indexing gear discs, which solves the problem of poor fit accuracy between indexing gear disc A and indexing gear disc B.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A tooling fixture for grinding an indexing gear disc includes a fixture body and a tensioning member. The fixture body has a guide portion on its upper side. The tensioning member includes a first tensioning part that is annular and sleeved outside the guide portion. The tensioning member has several elongated deformation grooves on the side of the first tensioning part. The tensioning member further includes a second tensioning part that is annular and concentrically arranged with the first tensioning part, and a connecting portion fixed between the lower end of the first tensioning part and the lower end of the second tensioning part. Each deformation groove is partially located on the second tensioning part. The fixture body has an outer abutment portion arranged around the outer side of the second tensioning part and an inner abutment portion that passes through the connecting portion and is arranged around the outer side of the first tensioning part. The upper end of the inner abutment portion is flush with the upper end of the outer abutment portion.

[0007] During clamping, the indexing gear B is placed against the inner abutment part, ensuring its inner hole fits outside the first tensioning part of the tensioning member. The indexing gear A is placed against the outer abutment part, ensuring its inner hole fits outside the second tensioning part. After aligning the teeth on the end face of the indexing gear A with the teeth on the end face of the indexing gear B, the tensioning member is driven to expand outward. The first and second tensioning parts are connected by a connecting part, and each deformation groove is partially located on the second tensioning part. Thus, as the first tensioning part expands outward, the second tensioning part also expands outward. That is, the first tensioning part tightens against the inner wall of the indexing gear B to form a positioning clamp, and the second tensioning part tightens against the inner wall of the indexing gear A to form a positioning clamp. This allows indexing gear A and indexing gear B to be simultaneously and concentrically positioned and clamped on the fixture. This enables the beveled surfaces of the teeth on both gears to be ground synchronously and in alignment, significantly improving grinding accuracy and consequently enhancing the fit between the ground gears. Before actual clamping, the operator removes the tensioning component from the fixture, then mounts the fixture onto the grinding machine. The grinding wheel on the machine simultaneously grinds the upper surfaces of both the outer and inner abutments to ensure they are coplanar. This ensures that after indexing gear A abuts against the inner abutment and indexing gear B abuts against the outer abutment, the beveled surfaces of the teeth on the end face of indexing gear A are aligned with those on the end face of indexing gear B, guaranteeing grinding accuracy.

[0008] By configuring the tensioning element to include a tensioning part one, a connecting part, and a tensioning part two, with the tensioning part two being concentrically positioned with the tensioning part, and combining it with the inner and outer abutting parts, indexing gear A and indexing gear B can be installed and fixed on the same fixture, thereby achieving synchronous grinding of both and improving the fitting accuracy between indexing gear A and indexing gear B. Furthermore, indexing gear A and indexing gear B are synchronously and concentrically positioned using a single tensioning element, resulting in fast clamping speed and high grinding accuracy.

[0009] In the aforementioned tooling fixture for grinding indexing gear discs, the inner abutment part includes several abutment posts evenly distributed on the outer side of the tensioning part, and the connecting part has several relief grooves through which the abutment posts pass. There is a gap between the groove wall of the relief groove and the outer peripheral wall of the corresponding abutment post, which allows the tensioning member to expand outward.

[0010] With the above settings, the opening action of the tensioning member composed of tensioning part one, connecting part and tensioning part two will not be affected by the setting of the inner abutment part, ensuring that the tooling fixture can be ground synchronously with the inclined surface of the end face tooth of indexing gear A aligned with the inclined surface of the end face tooth of indexing gear B, thereby improving the fitting accuracy of indexing gear A and indexing gear B after grinding.

[0011] In the above-mentioned tooling fixture for grinding indexing gear discs, the fixture body has a cavity, the guide part is located inside the cavity, and the outer abutment part protrudes from the fixture body where the cavity opening is located.

[0012] The tensioning element is set inside the cavity, and the outer abutment protrudes from the clamping body where the cavity opening is located. Compared to the entire part surrounding the cavity being an outer abutment, this structure makes grinding easier before actual clamping.

[0013] In the aforementioned tooling fixture for grinding indexing gear discs, the outer abutment is either an annular protrusion or includes several protrusions evenly distributed around the tensioning part.

[0014] The outer abutment is either a ring-shaped protrusion or includes several protrusions that are evenly spaced around the tensioning part, thus maximizing the contact area between the outer abutment and the indexing gear plate A.

[0015] In the aforementioned tooling fixture for grinding indexing gear discs, the cavity is a circular cavity, and the inner diameter of the cavity is slightly larger than the outer diameter of the tensioning part two.

[0016] The inner diameter of the concave cavity is slightly larger than the outer diameter of the second tensioning part. The inner circumferential wall of the concave cavity can be used to limit the expansion angle of the tensioning part, so as to avoid deformation caused by excessive expansion, which would lead to ineffective tensioning.

[0017] In the aforementioned tooling fixture for grinding indexing gear discs, a guide block is detachably connected to the side of the fixture body. A long strip-shaped sliding block is slidably connected to the guide block in the vertical direction. A long strip-shaped alignment block is vertically fixed to the upper end of the sliding block near the center line of the tensioner. An isosceles trapezoidal alignment groove is provided on the lower side of the alignment block. The alignment groove is distributed along the length direction of the alignment block. The alignment block has two contact strips that protrude from the two side walls of the alignment groove and are distributed along the length direction of the alignment block. The surface of the contact strip is a cylindrical curved surface.

[0018] After the indexing gear B abuts against the inner abutment and the indexing gear A abuts against the outer abutment, the guide block is connected to the side of the fixture body (or it can be connected beforehand). Then, the sliding block is connected to the guide block and moved downwards. The alignment block moves downwards accordingly, and the alignment work is completed by one tooth on the end face of the indexing gear B and one tooth on the end face of the indexing gear A simultaneously engaging in the alignment groove and forming line contact with the surfaces of the two contact strips located in the alignment groove. With this alignment structure, the alignment of the teeth on the end face of the indexing gear B and the end face of the indexing gear A can be easily completed with high alignment accuracy and small error, thus ensuring the accuracy of synchronous grinding.

[0019] Moreover, the alignment groove directly aligns with the teeth. This ensures that even if the number of teeth differs due to different dividing angles [here, "different number of teeth" refers to different numbers of teeth on the same indexing disc (eight teeth, twelve teeth), not that the number of teeth on indexing disc A differs from that on indexing disc B, because indexing disc A and indexing disc B are used in pairs; for example, when the number of teeth on indexing disc A is eight, the corresponding number of teeth on indexing disc B is also eight], the same alignment structure can still be used. This is because: when the number of teeth changes, the space between two adjacent teeth on the indexing disc becomes larger, but the change in the tooth profile of each tooth is not significant.

[0020] In the aforementioned tooling fixture for grinding indexing gears, the sliding block and the alignment block are integrally fixed together, and the alignment groove penetrates the side wall of the sliding block away from the center line of the tensioner.

[0021] The alignment groove is designed to penetrate directly through the side wall of the sliding block away from the center line of the tensioner. This allows the operator to visually observe the alignment of the teeth on indexing gear A with the teeth on indexing gear B from the side of the sliding block away from the center line of the tensioner, ensuring alignment accuracy and thus ensuring that synchronous grinding can be achieved using this fixture.

[0022] Compared with existing technologies, the tooling fixture for grinding the indexing gear discs of this invention, by configuring the tensioning element as including a tensioning part one, a connecting part, and a tensioning part two, with the tensioning part two being concentrically arranged with the tensioning part, and combined with the arrangement of inner and outer abutting parts, allows the indexing gear discs A and B to be installed and fixed on the same fixture. This enables them to be ground synchronously with the beveled surfaces of their teeth aligned, thereby improving the fitting accuracy between the indexing gear discs A and B. Moreover, since the indexing gear discs A and B are synchronously and concentrically positioned using a single tensioning element, the clamping speed is fast and the grinding accuracy is high. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a tooling fixture embodiment one for grinding the indexing gear plate.

[0024] Figure 2 This is a sectional view of the tooling fixture used for grinding this indexing gear.

[0025] Figure 3 This is an exploded view of the tensioner and the clamping body.

[0026] Figure 4 This is a schematic diagram of the structure at the sliding block.

[0027] Figure 5 This is a sectional view of the fixture used for grinding the indexing gear plate after indexing gear plate A and indexing gear plate B are installed.

[0028] In the diagram, 1. Clamp body; 1a. Guide part; 1b. Inner abutment part; 1b1. Abutment post; 1c. Outer abutment part; 1d. Cavity; 1e. Main body; 1f. Mandrel; 2. Tensioner; 2a. Tensioner part one; 2a1. Fitting part; 2b. Deformation groove; 2c. Connecting part; 2c1. Relief groove; 2d. Tensioner part two; 3. Pull rod; 3a. Protrusion; 4. Guide block; 5. Sliding block; 6. Alignment block; 6a. Alignment groove; 6b. Contact strip; 7. Base; 7a. Oil passage hole; 7b. Annular oil passage groove; 8. Cavity; 9. Piston; 10. Cylinder body; 10a. Oil inlet hole; 11. Indexing gear plate A; 12. Indexing gear plate B. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] Example 1

[0031] like Figure 1 , Figure 2 and Figure 3As shown, the tooling fixture for grinding indexing gear discs includes a fixture body 1 and a tensioner 2. The upper side of the fixture body 1 has a guide portion 1a. The tensioner 2 includes a ring-shaped tensioning portion 2a that is sleeved outside the guide portion 1a. The tensioner 2 has several elongated deformation grooves 2b on the side of the tensioning portion 2a. The inner wall of the tensioning portion 2a and the outer wall of the guide portion 1a have the same taper and abut against each other. A pull rod 3 is inserted inside the guide part 1a. The upper end of the pull rod 3 is located outside the guide part 1a and a limiting groove is provided on its outer periphery. A mating part 2a1 is provided on the inner periphery of the upper end of the tensioning part 2a. The mating part 2a1 is located in the limiting groove. A protrusion 3a is provided on the outer periphery of the upper end of the pull rod 3. The lower side wall of the protrusion 3a is the upper side wall of the limiting groove. The protrusion 3a abuts against the upper end of the tensioning part 2a and the outer diameter of the protrusion 3a is approximately the same as the outer diameter of the tensioning part 2a. The tensioning member 2 also includes a ring-shaped tensioning part 2d concentrically arranged with the tensioning part 2a and a connecting part 2c fixed between the lower end of the tensioning part 2a and the lower end of the tensioning part 2d. Each deformation groove 2b is partially located on the tensioning part 2d. A receiving cavity is formed between the tensioning part 2a, the connecting part 2c and the tensioning part 2d. The inner diameter of the tensioning part 2d is designed to be slightly larger than the outer diameter of the indexing gear B12. The clamping body 1 has an outer abutment part 1c arranged around the outer periphery of the tensioning part 2d and an inner abutment part 1b that passes through the connecting part 2c and is arranged around the outer periphery of the tensioning part 2a. The upper end of the inner abutment part 1b is flush with the upper end of the outer abutment part 1c and lower than the upper edge of the tensioning part 2d.

[0032] Among them, such as Figure 2 and Figure 3 As shown, the inner abutment part 1b includes a plurality of abutment posts 1b1 evenly distributed on the outside of the tensioning part 2a, specifically six abutment posts 1b1. The connecting part 2c has a plurality of clearance grooves 2c1 through which the abutment posts 1b1 pass. There is a gap between the groove wall of the clearance groove 2c1 and the outer peripheral wall of the corresponding abutment post 1b1, allowing the tensioning member 2 to expand outward. The clamping body 1 has a concave cavity 1d with a downward recessed cavity 1d. The guide part 1a is located in the concave cavity 1d, and the outer abutment part 1c is located at the opening of the concave cavity 1d in the clamping body 1. The outer abutment part 1c is specifically an annular protrusion. The concave cavity 1d is a circular cavity, and the outer diameter of the tensioning part 2d is slightly smaller than the inner diameter of the concave cavity 1d. In this embodiment, the clamping body 1 includes a generally disc-shaped main body 1e and a spindle 1f fixedly connected to the lower side of the main body 1e. The concave cavity 1d is provided on the main body 1e, and the guide part 1a is the upper end of the spindle 1f.

[0033] Furthermore, such as Figure 1 , Figure 2 and Figure 4As shown, a guide block 4 is detachably connected to the side of the clamping body 1. A long strip-shaped sliding block 5 is slidably connected to the guide block 4 in the vertical direction. A long strip-shaped alignment block 6 is vertically fixed to the upper end of the sliding block 5 near the center line of the tensioner 2. An isosceles trapezoidal alignment groove 6a is provided on the lower side of the alignment block 6. The alignment groove 6a is distributed along the length direction of the alignment block 6. The alignment block 6 has two contact strips 6b that protrude from the two side walls of the alignment groove 6a and are distributed along the length direction of the alignment block 6. The surface of the contact strips 6b is a cylindrical curved surface. The sliding block 5 and the alignment block 6 are integrally fixed together. The alignment groove 6a penetrates the side wall of the sliding block 5 away from the center line of the tensioner 2.

[0034] In practice, such as Figure 1 and Figure 2 As shown, the fixture for grinding the indexing gear plate also includes a base 7. A mandrel 1f is fixedly connected to the upper end of the base 7, and a cavity 8 is formed between the base 7 and the mandrel 1f. A piston 9, which divides the cavity 8 into upper and lower parts, is provided inside the cavity 8. The lower end of the pull rod 3 is fixedly connected to the piston 9. A cylinder body 10 is fitted around the base 7. Bearings are provided between the inner circumferences of the upper and lower ends of the cylinder body 10 and the mandrel 1f and the base 7, respectively. The side of the cylinder body 10 is provided with two oil inlet holes 10a, and the side of the base 7 is provided with two corresponding oil passage holes 7a. One oil passage hole 7a communicates with the upper part of the cavity 8, and the other oil passage hole 7a communicates with the lower part of the cavity 8. The outer circumference of the base 7 is provided with annular oil passage grooves 7b corresponding to the two oil passage holes 7a, and the two oil inlet holes 10a are respectively connected to the two annular oil passage grooves 7b.

[0035] In use, the base 7 is fixedly connected to the rotary worktable, the two oil inlets 10a are respectively connected to the oil circuit, and an anti-rotation bracket is used to position the cylinder body 10 to ensure that the cylinder body 10 remains stationary. During clamping, if... Figure 5As shown, first, the indexing gear plate B12 is placed against each of the abutment posts 1b1 and its inner hole is fitted outside the tensioning part 2a. Then, the indexing gear plate A11 is placed against the outer abutment part 1c and its inner hole is fitted outside the tensioning part 2d. Then, the teeth on the end face of the indexing gear plate A11 are aligned with the teeth on the end face of the indexing gear plate B12 using the alignment block 6, so that the inclined surface of the teeth on the end face of the indexing gear plate A11 is aligned with the inclined surface of the teeth on the end face of the indexing gear plate B12. Specifically, this is achieved by using the isosceles trapezoidal alignment groove 6a set on the lower side of the alignment block 6. The alignment structure needs to be removed from the fixture 1 during grinding. Then, pressure is supplied to the upper part of the cavity 8 through one of the oil inlet holes 10a, causing the piston 9 to move downward with the pull rod 3. This causes the tensioning member 2 to move downward and, with the help of the taper, the tensioning part 2a, in conjunction with the deformation groove 2b, to be tensioned outward against the inner wall of the indexing gear plate B12. The tensioning part 2a and the tensioning part 2d are connected by the connecting part 2c, and each deformation groove 2b is partially located on the tensioning part 2d (equivalent to opening directly from the tensioning part 2d to the tensioning part 2a when opening the deformation groove 2b). Thus, while the tensioning part 2a expands outward, the tensioning part 2d also expands outward. That is, the tensioning part 2a is tensioned on the inner wall of the indexing gear plate B12 to form a positioning clamp, and the tensioning part 2d is tensioned on the inner wall of the indexing gear plate A11 to form a positioning clamp. This allows the indexing gear plates A11 and B12 to be simultaneously and concentrically positioned and clamped on the fixture 1. This enables the aligned and synchronous grinding of the inclined surfaces of the teeth on both plates, significantly improving grinding accuracy and consequently enhancing the fit between the ground plates. In practice, the upper end face of the pull rod 3, after clamping, is lower than the end face of the teeth on both plates A11 and B12 to avoid interfering with the grinding wheel's operation. After grinding one tooth, the worktable rotates, causing the fixture 1 to rotate, to switch to the grinding position for the next tooth.

[0036] Before actual clamping, the operator first removes the tensioner 2 from the fixture body 1, and then installs the fixture body 1 onto the grinding machine. The grinding wheel on the grinding machine simultaneously grinds the upper end face of the outer abutment part 1c and the upper end face of the inner abutment part 1b to ensure that the two are coplanar. This ensures that after the indexing gear plate A11 abuts against the inner abutment part 1b and the indexing gear plate B12 abuts against the outer abutment part 1c, the inclined surface of the teeth on the end face of the indexing gear plate A11 is aligned with the inclined surface of the teeth on the end face of the indexing gear plate B12 to ensure grinding accuracy.

[0037] Example 2

[0038] This embodiment is basically the same as the first embodiment in terms of structure and principle, except that: in this embodiment, the outer abutment 1c includes a number of protrusions evenly distributed around the tensioning part 2d.

[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 tooling fixture for grinding an indexing gear disc, comprising a fixture body (1) and a tensioning member (2), wherein the fixture body (1) has a guide portion (1a) on its upper side, and the tensioning member (2) includes a first tensioning portion (2a) that is annular and sleeved outside the guide portion (1a), and the tensioning member (2) has a plurality of elongated deformation grooves (2b) on the side of the first tensioning portion (2a), characterized in that the tensioning member (2) further includes a second tensioning portion (2d) that is annular and concentrically arranged with the first tensioning portion (2a), and a tensioning portion fixed to the lower end of the first tensioning portion (2a). The connecting part (2c) between the lower ends of the tensioning part two (2d) and the deformation groove (2b) are opened through the connecting part (2c) to the side of the tensioning part two (2d). The clamp body (1) has an outer abutment (1c) arranged around the outside of the tensioning part two (2d) and an inner abutment (1b) arranged through the connecting part (2c) and around the outside of the tensioning part one (2a). The upper end of the inner abutment (1b) is flush with the upper end of the outer abutment (1c). The tensioning part two (2d) is higher than the outer abutment (1c), and the tensioning part one (2a) is higher than the inner abutment (1b).

2. The tooling fixture for grinding indexing gear discs according to claim 1, characterized in that, The inner abutment part (1b) includes a number of abutment posts (1b1) evenly distributed on the outside of the tensioning part (2a). The connecting part (2c) has a number of relief grooves (2c1) through which the abutment posts (1b1) pass. There is a gap between the groove wall of the relief groove (2c1) and the outer peripheral wall of the corresponding abutment post (1b1) for the tensioning member (2) to expand outward.

3. The tooling fixture for grinding indexing gear discs according to claim 2, characterized in that, The clamping body (1) has a cavity (1d), a guide part (1a) is located inside the cavity (1d), and an outer abutment part (1c) protrudes from the clamping body (1) where the opening of the cavity (1d) is located.

4. The tooling fixture for grinding indexing gear discs according to claim 3, characterized in that, The outer abutment (1c) is a ring-shaped protrusion or the outer abutment (1c) includes several protrusions evenly distributed around the tensioning part (2d).

5. The tooling fixture for grinding indexing gear discs according to claim 3, characterized in that, The cavity (1d) is a circular cavity, and the inner diameter of the cavity (1d) is slightly larger than the outer diameter of the tensioning part (2d).

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

7. The tooling fixture for grinding indexing gear discs according to claim 6, characterized in that, The sliding block (5) and the alignment block (6) are integrally fixed together, and the alignment groove (6a) penetrates the side wall of the sliding block (5) away from the center line of the tensioner (2).

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