A method for processing small thin-walled locking ring claws

Abstract

A machining method for a small thin-walled locking ring chuck includes the following steps: Step S1: Machining an annular blank, machining the inner hole and outer circle to the required dimensions to obtain an annular part; Step S2: Designing and manufacturing a positioning mandrel: the positioning mandrel includes a clamping part and a part mounting part, with a positioning step surface formed between the clamping part and the part mounting part; the outer circle of the part mounting part is machined according to the inner hole of the annular part in Step S1, so that the fit clearance is 0 after the annular part is installed in the part mounting part; Step S3: Installing the annular part on the part mounting part of the positioning mandrel, with the end face of the annular part abutting against the positioning step surface; Step S4: Fixing the positioning mandrel with the annular part on a positioning block that can achieve 90-degree indexing, and then installing the positioning block on a wire cutting machine; Step S5: Aligning the center and end face of the annular part, and performing the first wire cutting; rotating the positioning block together with the positioning mandrel and the annular part by 90 degrees, and performing the second wire cutting.

Description

Technical Field

[0001] This invention relates to the field of aero-engine parts processing technology, and in particular to a processing method for a small, thin-walled locking ring claw. Background Technology

[0002] In the field of aero-engines, locking rings are a commonly used component; their structure is described below. Figure 1 and Figure 2 This part has four locking jaws evenly distributed on its end face. The function of these jaws is to lock the parts in place after bending during assembly. For machining the jaws of this type of part, due to its small size (outer diameter only φ9.7mm, height only 5mm) and thin-walled structure, the wall thickness is only... mm, inner diameter is When machining the chuck jaws, the two ends of the jaw width dimension B form wedge-shaped edges, which are prone to curling under cutting force, failing to meet design requirements. Therefore, the chuck jaws are machined using a non-cutting force machining method: wire EDM. Machining four chuck jaws using this method requires two installations on the machine tool (one at 0 degrees and the other at 90 degrees circumferentially). Because of the two clamping operations and the clearance between the hole and the positioning mandrel, the workpiece axes do not coincide in the two installation positions. If the center positioning error of the inner hole exceeds 0.03mm, the difference in dimension B of the four parts can reach 0.26mm. Furthermore, due to the clearance between the current positioning mandrel and the inner hole of the part, the workpiece may be blown away by the molybdenum wire during wire EDM. Summary of the Invention

[0003] The main objective of this invention is to propose a processing method for small, thin-walled locking ring claws, which eliminates the fit clearance between the positioning mandrel and the inner hole of the part, ensures that the part will not be carried away during wire cutting, and at the same time ensures that the width of the four locking claws is uniform.

[0004] To achieve the above objectives, this invention proposes a processing method for small, thin-walled locking ring claws, comprising the following steps:

[0005] Step S1: Use a ring-shaped blank for machining, machining the inner hole and outer circle to the required dimensions to obtain a ring-shaped part;

[0006] Step S2: Design and manufacture positioning mandrel: The positioning mandrel includes a clamping part and a part mounting part. The outer circle of the clamping part and the outer circle of the part mounting part are coaxially arranged, and a positioning step surface is formed between the clamping part and the part mounting part. The outer circle of the part mounting part is machined according to the inner hole of the annular part in step S1, so that the fit clearance is 0 after the annular part is installed in the part mounting part.

[0007] Step S3: Install the annular part on the part mounting part of the positioning mandrel, with the end face of the annular part abutting against the positioning step surface;

[0008] Step S4: Fix the positioning mandrel with the ring part on the positioning block that can achieve 90-degree indexing, and then install the positioning block on the wire cutting machine.

[0009] Step S5: Align the center and end face of the ring part and perform the first wire cut; rotate the positioning block, positioning mandrel, and ring part together by 90 degrees and perform the second wire cut.

[0010] Preferably, a through hole is provided at the center of the positioning mandrel, which passes through the clamping part and the part mounting part; multiple slots are evenly distributed on the part mounting part; and each slot is arranged along the axial direction of the part mounting part, and the multiple slots divide the part mounting part into multiple cantilevered arc-shaped petal structures.

[0011] Preferably, the number of slots is four, dividing the part mounting section into four cantilevered arc-shaped petal structures.

[0012] Preferably, the positioning block is a V-shaped block structure, and the positioning block has a V-shaped groove for cooperating with the clamping part of the positioning mandrel; the positioning block is provided with a positioning bottom surface and a positioning side surface; the positioning bottom surface is perpendicular to the positioning side surface.

[0013] Preferably, when the positioning mandrel is installed on the positioning block, the distance from the center of the positioning mandrel to the positioning side is L1, and the distance from the center of the positioning mandrel to the positioning bottom surface is L2, where L1=L2.

[0014] Preferably, a clamping structure is provided on the top surface of the positioning block to clamp the clamping part of the positioning mandrel onto the V-groove of the positioning block.

[0015] Preferably, the clamping structure includes a pressure plate and screws disposed at both ends of the pressure plate; during clamping, the screws pass through the pressure plate and are threadedly connected to the positioning block.

[0016] Preferably, the length of the pressure plate is L3, which is less than the width of the positioning block.

[0017] Preferably, the length of the part mounting portion is t; the length of the annular part is L; where t ≥ 2L / 3; during wire cutting in step S5, the part mounting portion can be cut.

[0018] Preferably, a chamfer is provided on the edge of the end of the mounting portion of the part.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0020] (1) In this invention, a positioning mandrel is used to install the annular component, and the positioning mandrel with the annular component is fixedly installed on a positioning block that can achieve 90-degree indexing. The center and end face of the annular component are aligned, and a first wire cut is performed. The positioning block, together with the positioning mandrel and the annular component, are rotated 90 degrees and a second wire cut is performed. This solves the problems of inaccurate positioning and unreliable clamping when machining lock ring chucks in conventional processes, ensures accurate positioning of the chucks during machining, avoids unevenness of the machined lock ring chucks, and improves the machining accuracy and pass rate of the parts.

[0021] (2) In this invention, since multiple slots are evenly distributed on the part mounting portion of the positioning mandrel, and each slot is arranged along the axial direction of the part mounting portion, the multiple slots divide the part mounting portion into multiple cantilevered arc-shaped petal structures. Therefore, the cantilevered arc-shaped petals have a certain elastic deformation capacity, and after the ring part is installed, it can effectively ensure that the fit clearance between the ring part and the part mounting portion on the positioning mandrel is 0, thus avoiding the movement of the part during wire cutting.

[0022] (3) In this invention, since a positioning block capable of 90-degree indexing is used, and the distance from the center of the positioning mandrel to the positioning side is L1, and the distance from the center of the positioning mandrel to the positioning bottom surface is L2, and L1=L2, after 90-degree flipping, the center lines of the parts coincide between the first wire cutting and the second wire cutting, and the processed chuck has good uniformity and low scrap rate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a front view of the locking ring in this invention;

[0025] Figure 2 for Figure 1 Sectional view of AA;

[0026] Figure 3 This is a schematic diagram of the ring-shaped part obtained in step S1 of the present invention;

[0027] Figure 4 This is a front sectional view of the positioning mandrel in this invention;

[0028] Figure 5 This is a right view of the positioning mandrel in this invention;

[0029] Figure 6This is a front view of the positioning mandrel installed after the positioning block in this invention;

[0030] Figure 7 This is a right view showing the positioning mandrel installed after the positioning block in this invention.

[0031] Explanation of reference numerals: 1. Ring-shaped part; 2. Positioning mandrel; 2a. Clamping part; 2b. Part mounting part; 2c. Positioning step surface; 2d. Through hole; 2e. Slot; 3. Positioning block; 3a. Positioning bottom surface; 3b. Positioning side surface; 4. Pressure plate; 5. Screw. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] Combination Figure 1 and Figure 2 The diagram shown is a structural schematic of the locking ring. Four locking claws are evenly distributed on the end face of the locking ring part. These four claws are used for locking after bending during assembly. This part is small in size, with a basic outer diameter of only φ9.7mm and a basic height of only 5mm; it has a thin-walled structure, with a wall thickness of only [missing information]. mm, inner diameter is .

[0035] Combination Figures 3 to 7 As shown, this embodiment provides a method for processing small, thin-walled locking ring jaws, including the following steps:

[0036] Step S1: Using a ring-shaped blank, the inner hole and outer circle are machined to the required dimensions to obtain ring part 1. The shape of ring part 1 is as follows: Figure 2 As shown;

[0037] Step S2: Design and manufacture positioning mandrel 2: The positioning mandrel 2 includes a clamping part 2a and a part mounting part 2b. The outer circle of the clamping part 2a is coaxially arranged with the outer circle of the part mounting part 2b, and a positioning step surface 2c is formed between the clamping part 2a and the part mounting part 2b. The outer circle of the part mounting part 2b is machined according to the inner hole of the annular part 1 in step S1, that is, the outer diameter of the part mounting part 2b is φD, which is consistent with the inner hole of the annular part 1. The parts are fitted together such that after the annular part 1 is installed in the part mounting part 2b, the fit clearance is 0.

[0038] Step S3: Install the annular part 1 on the part mounting part 2b of the positioning mandrel 2, and the end face of the annular part 1 abuts against the positioning step surface 2c;

[0039] Step S4: Fix the positioning mandrel 2 with the ring part 1 on it to the positioning block 3 that can achieve 90-degree indexing, and then install the positioning block 3 on the wire cutting machine.

[0040] Step S5: Align the center and end face of the ring part 1 and perform the first wire cut; rotate the positioning block 3 together with the positioning mandrel 2 and the ring part 1 by 90 degrees and perform the second wire cut.

[0041] Combination Figure 3 , Figure 4 As shown, a through hole 2d is provided at the center of the positioning mandrel 2, which penetrates the clamping part 2a and the part mounting part 2b. Multiple slots 2e are evenly distributed on the part mounting part 2b, and each slot 2e is arranged along the axial direction of the part mounting part 2b. These multiple slots 2e divide the part mounting part 2b into multiple cantilevered arc-shaped petal structures. The cantilevered arc-shaped petals possess a certain elastic deformation capacity. After the annular part 1 is installed, it can effectively ensure that the fit clearance between the annular part 1 and the part mounting part 2b on the positioning mandrel 2 is 0, avoiding stress during wire cutting. The cantilevered arc-shaped petal structure eliminates the fit clearance between the positioning mandrel 2 and the inner hole of the annular part 1, and the positioning mandrel 2 and the annular part 1 can be reliably fixed, ensuring that the part will not move during wire cutting. This also ensures that the uniformity of the four jaws of the locking ring is within 0.3mm, meeting the processing requirements.

[0042] In this embodiment, the number of slots 2e is four, dividing the part mounting part 2b into four cantilevered arc-shaped petal structures.

[0043] Combination Figure 6 , Figure 7As shown, the positioning block 3 is a V-shaped block structure, with a V-groove for engaging with the clamping part 2a of the positioning mandrel 2. The positioning block 3 has a positioning bottom surface 3a and a positioning side surface 3b; the positioning bottom surface 3a is perpendicular to the positioning side surface 3b. The V-shaped block design is simple in structure, convenient for positioning, and facilitates 90-degree indexing. Furthermore, when the positioning mandrel 2 is mounted on the positioning block 3, the distance L1 from the axis of the positioning mandrel 2 to the positioning side surface 3b and the distance L2 from the axis of the positioning mandrel 2 to the positioning bottom surface 3a, where L1=L2, make it easy to ensure that the center lines of the parts coincide between the first and second wire cutting operations after a 90-degree rotation, resulting in good uniformity of the chuck and a low scrap rate.

[0044] Combination Figure 6 , Figure 7 As shown, a clamping structure is provided on the top surface of the positioning block 3 to clamp the clamping part 2a of the positioning mandrel 2 onto the V-groove of the positioning block 3. Specifically, the clamping structure includes a pressure plate 4 and screws 5 at both ends of the pressure plate 4; during clamping, the screws 5 pass through the pressure plate 4 and are threadedly connected to the positioning block 3. The clamping part 2a of the positioning mandrel 2 can be clamped onto the V-groove of the positioning block 3 using the pressure plate 4, which is simple in structure and convenient in clamping operation. Furthermore, in order to ensure that the end of the pressure plate 4 does not interfere with the positioning side 3b after being rotated 90 degrees, the length L3 of the pressure plate 4 is required to be less than the width of the positioning block 3.

[0045] Combination Figure 3 and Figure 4 As shown, the length of the part mounting portion 2b is t; the length of the annular part 1 is L; where t ≥ 2L / 3; to ensure that the annular part 1 can be firmly mounted on the part mounting portion 2b of the positioning mandrel 2, the length of the part mounting portion 2b must be guaranteed. If the length is too short, the annular part 1 will be unstable. Therefore, t ≥ 2L / 3 is required. During wire cutting in step S5, the part mounting portion 2b can be cut.

[0046] Combination Figure 4 As shown, a chamfer 2f is provided on the edge of the end of the part mounting portion 2b. The chamfer 2f serves as a guide and helps to mount the annular part 1 onto the part mounting portion 2b.

[0047] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method of machining a small thin-wall lock collar jaw, characterized in that, The method comprises the following steps: Step S1: machining with a ring blank, machining the inner hole and the outer circle to size, to obtain a ring part (1); Step S2: design and manufacture a positioning mandrel (2): the positioning mandrel (2) comprises a clamping part (2a) and a part mounting part (2b), the outer circle of the clamping part (2a) and the outer circle of the part mounting part (2b) are coaxially arranged, and a positioning step surface (2c) is formed between the clamping part (2a) and the part mounting part (2b); the outer circle of the part mounting part (2b) is matched with the inner hole of the ring part (1) in step S1, so that the ring part (1) is mounted on the part mounting part (2b) after the cooperation clearance is 0; Step S3: mounting the ring part (1) on the part mounting part (2b) of the positioning mandrel (2), and the end face of the ring part (1) abutting on the positioning step surface (2c); Step S4: mounting the positioning mandrel (2) with the ring part (1) on the positioning block (3) capable of realizing 90-degree indexing, and then mounting the positioning block (3) on the wire cutting machine tool; Step S5: aligning the center and end face of the ring part (1), and performing first wire cutting; turning the positioning block (3) together with the positioning mandrel (2) and the ring part (1) by 90 degrees, and performing second wire cutting.

2. The method of claim 1, wherein the small thin-wall lock collar clamping jaw is made of a material selected from the group consisting of: aluminum, zinc alloy, and magnesium alloy. A through hole (2d) is arranged at the center of the positioning mandrel (2), the through hole (2d) penetrates the clamping part (2a) and the part mounting part (2b); a plurality of slots (2e) are uniformly arranged on the part mounting part (2b); each slot (2e) is arranged along the axial direction of the part mounting part (2b), and the plurality of slots (2e) divide the part mounting part (2b) into a plurality of cantilever-shaped arc petal structures.

3. The method of claim 2, wherein the small thin-wall lock collar clamping jaw is made of a material selected from the group consisting of: aluminum, magnesium, zinc, and alloys thereof. The number of the slots (2e) is four, and the part mounting part (2b) is equally divided into four cantilever-shaped arc petal structures.

4. The processing method of a small thin-walled locking ring claw as described in claim 1, characterized in that, The positioning block (3) is a V-shaped block structure, and a V-shaped groove is arranged on the positioning block (3) for cooperating with the clamping part (2a) of the positioning mandrel (2); a positioning bottom surface (3a) and a positioning side surface (3b) are arranged on the positioning block (3); the positioning bottom surface (3a) is perpendicular to the positioning side surface (3b).

5. The method of claim 4, wherein the small thin-wall lock collar clamping jaw is made of a material selected from the group consisting of: aluminum, magnesium, zinc, and alloys thereof. 5 When the positioning mandrel (2) is mounted on the positioning block (3), the distance L1 from the center of the positioning mandrel (2) to the positioning side surface (3b) is equal to the distance L2 from the center of the positioning mandrel (2) to the positioning bottom surface (3a).

6. The method of claim 4, wherein the small thin-wall lock collar clamping jaw is made of a material selected from the group consisting of: aluminum, magnesium, zinc, and alloys thereof. A pressing structure is arranged on the top surface of the positioning block (3) for pressing the clamping part (2a) of the positioning mandrel (2) on the V-shaped groove of the positioning block (3).

7. The method of claim 6 wherein the step of machining the small thin-wall lock collar clamping jaw further comprises the step of: The pressing structure comprises a pressing plate (4) and screws (5) arranged at both ends of the pressing plate (4); when pressing, the screws (5) are threadedly connected with the positioning block (3) through the pressing plate (4). ​ 8. The method of claim 7, wherein the small thin-wall lock collar clamping jaw is made of a material selected from the group consisting of: aluminum, magnesium, zinc, and alloys thereof. The length of the pressing plate (4) is L3, which is less than the width of the positioning block (3).

9. The method of claim 1 wherein, The length of the part mounting part (2b) is t, and the length of the ring part (1) is L; wherein t≥2L / 3; during the wire cutting in step S5, the part mounting part (2b) can be cut.

10. The processing method of a small thin-walled locking ring claw as described in claim 1, characterized in that, An inverted chamfer (2f) is provided on the edge of the tip of the part mounting portion (2b).

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