A self-centering fixture structure for honing teeth on disc-shaped parts

Abstract

The application discloses a self-centering clamp structure for honing disc parts, wherein the disc part is provided with an inner hole along the direction of a central axis, and the clamp structure comprises a clamp body, a taper sleeve and a locking nut; the clamp body is provided with a central hole at both ends, which is matched with a machine tool center during honing; the outer peripheral wall of the clamp body is provided with a stop part, a conical part and a threaded part; the taper sleeve is sleeved on the conical part; the locking nut is matched with the threaded part and is in contact with one end of the taper sleeve; the inner hole of the disc part is sleeved on the outer peripheral wall of the taper sleeve; one end of the disc part is supported on the stop part; and the locking nut is rotated to push the taper sleeve to slide on the conical part so as to tighten or relax the inner hole of the disc part. The application has the advantages of high clamping efficiency and high part surface quality.

Description

Technical Field

[0001] This invention relates to the field of machining fixture structures, and more particularly to a self-centering fixture structure for honing disc-shaped parts. Background Technology

[0002] Aviation-grade disc-type planetary gears require high rotational speed, high precision, and good surface quality. A simplified schematic diagram of a typical disc-type part (6) is shown below. Figure 1 As shown, the disc-shaped part 6 has an inner hole 61 along the central axis, and a gear 62 is located in the middle of the outer peripheral wall. Gear hobbing and grinding / honing after heat treatment can further improve the tooth surface accuracy and surface quality of the part. Conventional fixture structures use mandrels or positioning outer circles, which require high consistency of the positioning inner hole size of the part and have low processing efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a self-centering fixture structure for honing disc-shaped parts with high clamping efficiency and high part surface quality.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A self-centering fixture structure for honing disc-shaped parts includes a disc-shaped part having an inner hole along its central axis, comprising a fixture body, a tapered sleeve, and a locking nut. The fixture body has a central hole along its central axis, which mates with a machine tool center during honing. The outer peripheral wall of the fixture body has a stop, a conical portion, and a threaded portion. The tapered sleeve is fitted onto the conical portion. The locking nut mates with the threaded portion and contacts one end of the tapered sleeve. The inner hole of the disc-shaped part is fitted onto the outer peripheral wall of the tapered sleeve. One end of the disc-shaped part rests against the stop. Rotating the locking nut pushes the tapered sleeve to slide on the conical portion to tighten or loosen the inner hole of the disc-shaped part.

[0006] As a further improvement to the above technical solution:

[0007] The tapered sleeve has a limiting ring on the side near the locking nut, and the locking nut has a limiting groove on the outer peripheral wall of the side near the tapered sleeve. The limiting ring and the limiting groove are matched.

[0008] The thickness of the mating part between the limiting ring and the limiting groove is L, and the width of the limiting groove is D, where L < D.

[0009] The clamp body has a transition section between the conical part and the threaded part, and the limiting ring and the limiting groove cooperate in the transition section.

[0010] The self-centering clamp structure also includes a limiting member for preventing the placement of the conical sleeve from rotating. The conical part has a first groove perpendicular to the central axis of the clamp body, and the inner wall of the conical sleeve has a second groove. The first groove and the second groove correspond to each other, and the limiting member is located in the space formed by the first groove and the second groove.

[0011] The self-centering fixture structure also includes a aligning ring, which is sleeved on the outer wall of the tapered sleeve. It is used to check whether the runout between the surface of the workpiece supported by the inspection stop and the center hole of the fixture meets the requirements before honing, and to unload during honing.

[0012] The conical sleeve is made of silicone rubber flat sealant or elastic sleeve.

[0013] The diameter of the conical portion near the stop is d1, and the diameter near the threaded portion is d2, where d1 > d2.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] This invention discloses a self-centering fixture structure for honing gears on disc-shaped parts. The fixture body is positioned on a machine tool via a central hole. A tapered sleeve engages with the conical surface of the fixture body's conical portion. Rotating the locking nut moves the tapered sleeve. When the outer diameter of the tapered sleeve expands, it positions and fixes the inner hole of the disc-shaped part. When the outer diameter of the tapered sleeve decreases, it loosens the inner hole of the disc-shaped part, quickly achieving the clamping and positioning of the disc-shaped part without manual alignment. The gears on the disc-shaped part are then honed. This high clamping efficiency improves product processing quality and on-site production efficiency. The actual machining surface accuracy reaches national standard level 3 (ordinary gear grinding cannot achieve level 3 accuracy), resulting in high part surface quality that meets process requirements. Attached Figure Description

[0016] Figure 1 This is a simplified schematic diagram of the disc-shaped part of the present invention.

[0017] Figure 2 This is a schematic diagram of the self-centering clamp structure and the clamping of disc-shaped parts according to the present invention.

[0018] Figure 3 This is a schematic diagram of the self-centering clamp structure alignment ring installation of the present invention.

[0019] Figure 4 This is a schematic diagram of the specific structure of the clamping device of the present invention.

[0020] Figure 5 This is a schematic diagram of the conical sleeve of the present invention.

[0021] Figure 6 This is a schematic diagram of the locking nut of the present invention.

[0022] Figure 7 This is a schematic diagram of the alignment ring structure of the present invention.

[0023] Figure 8 yes Figure 3 Enlarged view of a section at point C.

[0024] The labels in the diagram represent: 1. Clamp body; 11. Stop; 12. Conical part; 13. Threaded part; 14. Transition part; 15. Center hole; 16. First groove; 2. Tapered sleeve; 21. Limiting ring; 22. Second groove; 3. Locking nut; 31. Limiting groove; 4. Alignment ring; 5. Limiting component; 6. Disc-shaped part; 61. Inner hole; 62. Gear. Detailed Implementation

[0025] The present invention will be further described in detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0026] Example 1:

[0027] like Figures 2 to 8 As shown in the embodiment, the self-centering fixture structure for honing disc-shaped parts includes a disc-shaped part 6 with an inner hole 61 along the central axis, a fixture body 1, a tapered sleeve 2, and a locking nut 3. The fixture body 1 has a central hole 15 along the central axis, which mates with the machine tool center during honing. The outer peripheral wall of the fixture body 1 has a stop 11, a conical part 12, and a threaded part 13. The tapered sleeve 2 is fitted onto the conical part 12. The locking nut 3 mates with the threaded part 13 and contacts one end of the tapered sleeve 2. The inner hole 61 of the disc-shaped part 6 is fitted onto the outer peripheral wall of the tapered sleeve 2. One end of the disc-shaped part 6 rests on the stop 11. Rotating the locking nut 3 pushes the tapered sleeve 2 to slide on the conical part 12 to tighten or loosen the inner hole 61 of the disc-shaped part 6.

[0028] Install the self-centering fixture structure on the machine tool. Figure 2 , Figure 3 The bracket-shaped parts at both ends of the central hole 15 of the clamping body 1 are the machine tool centers (using a two-center fixing mode). The clamping body 1 is clamped and positioned on the machine tool through the central hole 15. The tapered sleeve 2 mates with the conical surface of the tapered part 12 of the clamping body 1. Rotating the locking nut 3 pushes the tapered sleeve 2 to move. When the outer diameter of the tapered sleeve 2 increases, it positions and fixes the inner hole 61 of the disc-shaped part 6. When the outer diameter of the tapered sleeve 2 decreases, the tapered sleeve 2 loosens the inner hole 61 of the disc-shaped part 6, quickly achieving the clamping and positioning of the disc-shaped part 6 without manual alignment. Then, the gear 62 of the disc-shaped part 6 is honed. The clamping efficiency is high, improving the product processing quality and on-site production efficiency. The actual machining surface accuracy reaches the national standard level 3 (ordinary gear grinding cannot reach level 3 accuracy), and the surface quality of the parts is high, meeting the process requirements.

[0029] In this embodiment, the pitch of the locking nut 3 and the threaded portion 13 is a short pitch to ensure the accuracy when expanding the inner hole 61.

[0030] like Figure 2 , 5 As shown in Figure 6, the tapered sleeve 2 is provided with a limiting ring 21 on the side near the locking nut 3, and the locking nut 3 is provided with a limiting groove 31 on the outer peripheral wall on the side near the tapered sleeve 2. The limiting ring 21 and the limiting groove 31 are matched.

[0031] The thickness of the mating part between the limiting ring 21 and the limiting groove 31 is L, and the width of the limiting groove 31 is D, where L < D, so that the locking nut 3 can lock the tapered sleeve 2 within a certain range.

[0032] like Figure 8 As shown, when the locking nut 3 pushes the tapered sleeve 2 to lock the inner hole 61 of the disc-like part 6, the locking nut 3 and the tapered sleeve 2 come into contact with each other, and there is a distance s between the end face of the locking nut 3 and the end face of the conical part 12, where s > 0.

[0033] like Figure 4 As shown, the clamp body 1 has a transition part 14 between the conical part 12 and the threaded part 13, and the limiting ring 21 and the limiting groove 31 cooperate in the transition part 14.

[0034] like Figure 4 As shown, the diameter of the conical part 12 near the stop part 11 is d1, and the diameter of the conical part near the threaded part 13 is d2, where d1 > d2, which facilitates the expansion of the inner hole 61 of the disc-shaped part 6 by the conical sleeve 2.

[0035] like Figure 2 As shown, the self-centering fixture structure also includes a limiting member 5 to prevent the conical sleeve 2 from rotating. The conical portion 12 has a first groove 16 perpendicular to the central axis of the fixture body 1, and the inner wall of the conical sleeve 2 has a second groove 22. The first groove 16 and the second groove 22 correspond to each other, and the limiting member 5 is located in the space formed by the first groove 16 and the second groove 22. When the locking nut 3 is rotated, torque is transmitted to the conical sleeve 2. The limiting member 5 is installed on the conical surface of the fixture body 1 to prevent the conical sleeve 2 from rotating with the locking nut 3. In this embodiment, there are two limiting members 5, which are screws.

[0036] like Figure 3 and Figure 7 As shown, the self-centering fixture structure also includes a aligning ring 4, which is sleeved on the outer wall of the tapered sleeve 2. The inner diameter of the aligning ring 4 is the same as the inner diameter of the disc-shaped part 6. It is used to check whether the runout between the aligning ring 4 and the stop 11, and between the outer circle of the aligning ring 4 and the center hole of the fixture body 1, meets the requirements (≤0.005mm) before honing. It is unloaded during honing. The aligning ring 4 and the stop 11 support surface ( Figure 3 The B end face is required to have a total runout of ≤0.005mm with respect to the center hole of the fixture body 1. Before each use, the self-centering fixture structure uses the alignment ring 4 to check the runout of the fixture. It is suitable for honing of small batches of disc-shaped parts 6.

[0037] The tapered sleeve 2 is made of silicone rubber flat sealant or an elastic sleeve. By changing the outer diameter of the tapered sleeve 2, it can be adapted to the honing of disc-shaped parts 6 with different inner hole sizes.

[0038] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A self-centering fixture structure for honing a disk-like part, the disk-like part (6) comprising an inner hole (61) opened in a central axis direction, characterized in that: It comprises a clamping body (1), a taper sleeve (2) and a locking nut (3), the clamping body (1) is provided with a central hole (15) at both ends, the central hole (15) is matched with a machine tool center during gear honing; The outer peripheral wall of the clamping body (1) is provided with a stop portion (11), a conical portion (12) and a threaded portion (13), the taper sleeve (2) is sleeved on the conical portion (12), the locking nut (3) is matched with the threaded portion (13) and is in contact with one end of the taper sleeve (2), the inner hole (61) of the disc-shaped part (6) is sleeved on the outer peripheral wall of the taper sleeve (2), one end of the disc-shaped part (6) is supported on the stop portion (11), and the locking nut (3) is rotated to push the taper sleeve (2) to slide on the conical portion (12) to tighten or relax the inner hole (61) of the disc-shaped part (6). The taper sleeve (2) is provided with a limiting ring (21) near the locking nut (3), and the outer peripheral wall of the locking nut (3) is provided with a limiting groove (31) near the taper sleeve (2), the limiting ring (21) and the limiting groove (31) are matched. The thickness of the matched part of the limiting ring (21) and the limiting groove (31) is L, and the width of the limiting groove (31) is D, L < D. The self-centering fixture structure further comprises an alignment ring (4), the alignment ring (4) is sleeved on the outer wall of the taper sleeve (2), and is used for checking whether the part surface on which the stop portion (11) is supported and the center hole of the clamping body (1) meet the requirements before gear honing, and is unloaded during gear honing.

2. The self-centering clamp structure of claim 1, wherein: The clamping body (1) is provided with a transition portion (14) between the conical portion (12) and the threaded portion (13), and the limiting ring (21) and the limiting groove (31) are matched at the transition portion (14).

3. The self-centering clamp structure according to claim 1 or 2, characterized by: The self-centering fixture structure further comprises a limiting piece (5) for preventing the taper sleeve (2) from rotating, the conical portion (12) is provided with a first groove (16) perpendicular to the central axis of the clamping body (1), the inner wall of the taper sleeve (2) is provided with a second groove (22), the first groove (16) and the second groove (22) correspond to each other, and the limiting piece (5) is located in the space formed by the first groove (16) and the second groove (22).

4. The self-centering clamp structure according to claim 1 or 2, characterized by: The taper sleeve (2) is made of a silicon rubber flat sealing glue or an elastic sleeve.

5. The self-centering clamp structure according to claim 1 or 2, characterized by: The diameter of the conical portion (12) near the stop portion (11) is d1, and the diameter of the conical portion (12) near the threaded portion (13) is d2, d1 > d2.

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