Aircraft shaft thin-walled part machining tooling

Abstract

The utility model belongs to the field of machining frock, concretely relates to an aviation shaft thin wall spare machining frock, including fixed sleeve and workpiece blank, fixed sleeve be provided with the central hole of workpiece blank insertion, the blank of shaft thin wall spare is inserted in the pipe cavity of workpiece blank, be provided with the hole position ring on workpiece blank, be provided with the ring side mould hole of the drill bit access on the side wall of hole position ring, the side wall of hole position ring sets up as the gear -like structure of concave -convex, the end portion that fixed sleeve is located with hole position ring sets up the protruding limit block, the limit block is spaced circular ring array setting in the end portion of fixed sleeve, the limit block and the recess of hole position ring side wall gear -like structure form the inlaying limit of the recess. The limit block of fixed sleeve is positioned to workpiece blank, improves the stability of workpiece blank when processing, avoids the product surface quality decline caused by the forceful clamping, effectively avoids the surface quality problem caused by the contact with product.

Description

Technical Field

[0001] This utility model belongs to the field of machining tooling, specifically relating to a machining tooling for thin-walled aerospace shaft parts. Background Technology

[0002] One of the core components of the CF100 aero-engine is a thin-walled shaft. The part has radial holes on its sidewalls that penetrate the shaft, with a diameter of 6-7 mm and a minimum wall thickness of only 0.47 mm. Drilling results in poor perpendicularity and a positional accuracy of 0.05, making it difficult to guarantee the theoretical dimensions of the hole edge distance. Furthermore, the part has 8-R2 circular arc grooves on its circumference, and the holes are densely packed, making it prone to deformation after machining if the support is not adequate. Maintaining surface quality during machining is also difficult. Moreover, due to the small size of the part and its low stress during clamping, it presents technical challenges such as susceptibility to scratches and abrasions. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a machining fixture for thin-walled aerospace shaft parts, which can effectively position the parts during machining and ensure the machining accuracy of the thin-walled parts.

[0004] The specific technical solution adopted in this utility model is as follows:

[0005] A machining fixture for thin-walled aerospace shaft parts includes a fixed sleeve and a tubular workpiece blank. The fixed sleeve has a central hole for inserting the workpiece blank. The workpiece blank is a hollow tubular structure. A hole positioning ring is provided on the workpiece blank. The sidewall of the hole positioning ring is configured with a gear-like structure with concave and convex shapes. A protruding limiting block is provided at the end of the fixed sleeve that abuts and limits the hole positioning ring. The limiting blocks are arranged in a spaced circular array at the end of the fixed sleeve. The limiting blocks and the concave parts of the gear-like structure on the sidewall of the hole positioning ring form an interlocking limiting mechanism.

[0006] An inner cavity sleeve is also provided inside the central hole. The inner cavity sleeve is a tubular structure embedded in the central hole. The workpiece blank is inserted into the cavity of the inner cavity sleeve. The port of the inner cavity sleeve for inserting the workpiece blank is a funnel-shaped structure.

[0007] The protrusion of the gear-shaped structure on the side wall of the hole position ring is located between the gaps of two adjacent limiting blocks. The protrusion is provided with a first arc groove die hole that penetrates the hole position ring and the workpiece blank. A raised ring is also provided on the ring surface of the hole position ring. A second arc groove die hole is provided on the side wall of the raised ring. Multiple sets of the second arc groove die holes are provided at equal intervals around the side wall of the raised ring. The first arc groove die hole coincides with the second arc groove die hole in the axial direction of the workpiece blank. The first arc groove die hole is located in the gap between adjacent limiting blocks.

[0008] The fixed sleeve has a fixing hole on its side wall, which is through the central hole. A fixing screw is installed in the fixing hole, and the fixing screw and the thread on the inner wall of the fixing hole form an adjustable thread engagement. The workpiece blank is fixedly connected to the fixed sleeve by the abutment of the fixing screw.

[0009] The outer wall of the fixed sleeve is also provided with a protruding locking ring.

[0010] The beneficial effects of this utility model are:

[0011] This utility model uses a limiting block with a fixed sleeve to position the workpiece blank, improving the stability of the workpiece blank during processing and avoiding the degradation of product surface quality caused by strong clamping. In order to further improve the processing strength of the blank, a core sleeve can be placed in the inner hole of the blank. The extrusion support between the workpiece blank and the core sleeve increases the strength and bearing capacity of the product. At the same time, the hardness of the core sleeve material is much lower than that of the product material, effectively avoiding surface quality problems caused by contact with the product. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of a thin-walled shaft component;

[0013] Figure 2 for Figure 1 A diagram from a top-down perspective;

[0014] Figure 3 This is a sectional view of a thin-walled shaft-type component.

[0015] Figure 4 This is a schematic diagram of the present invention in use;

[0016] Figure 5 This is a schematic diagram of the workpiece blank after installation according to this utility model;

[0017] Figure 6 for Figure 4 Schematic diagram of section AA;

[0018] In the attached diagram, 1 is a fixed sleeve, 101 is a center hole, 102 is a limiting block, 103 is a fixed hole, 104 is a fixed screw, 105 is a locking ring, 2 is a workpiece blank, 201 is a hole ring, 202 is a second arc groove die hole, 203 is a protruding ring, 204 is a protrusion, 205 is a first arc groove die hole, and 3 is an inner cavity sleeve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] Specific implementation examples Figure 1 and Figure 4As shown, this utility model is a machining fixture for thin-walled aerospace shaft parts, including a fixed sleeve 1 and a tubular workpiece blank 2. The fixed sleeve 1 is provided with a central hole 101 for inserting the workpiece blank 2. The workpiece blank 2 is a hollow tubular structure. A hole positioning ring 201 is provided on the workpiece blank 2. The side wall of the hole positioning ring 201 is configured as a gear-like structure with concave and convex shapes. A protruding limiting block 102 is provided at the end of the fixed sleeve 1 that abuts and limits the hole positioning ring 201. The limiting blocks 102 are arranged in a spaced circular array at the end of the fixed sleeve 1. The limiting blocks 102 and the concave part of the gear-like structure on the side wall of the hole positioning ring 201 form an interlocking limiting.

[0021] In processing an 8-R2 arc groove, this invention involves fixing a fixed sleeve 1 to a machine tool using a three-jaw chuck, CNC rotary table, or other fixtures. The pre-prepared workpiece blank 2 is then inserted into the fixed sleeve 1. The interlocking gear-like structure on the hole ring 201 of the workpiece blank 2 engages with the limiting block 102 of the fixed sleeve 1, preventing rotation of the workpiece blank 2 during processing. The lower end face of the hole ring 201 serves as a positioning reference surface, abutting against and limiting the end of the fixed sleeve 1. During processing, a drill bit is used to drill along the gap in the limiting block 102 to form an 8-R2 arc groove on the exposed end face of the workpiece blank 2. After one arc groove is processed, the next arc groove is processed by indexing to the next angle.

[0022] Furthermore, the tooling also includes a nylon core sleeve inserted into the inner hole of the workpiece blank 2 to support the internal cavity of the workpiece blank 2 and ensure sufficient clamping strength. The core sleeve can be drilled through together during drilling.

[0023] During the overall processing, the use of the fixed sleeve 1 facilitates the fixing and repositioning of the workpiece blank 2, improving processing convenience and ensuring good surface quality.

[0024] Furthermore, such as Figure 4 As shown, an inner cavity sleeve 3 is also provided inside the central hole 101. The inner cavity sleeve 3 is a tubular structure embedded in the central hole 101. The workpiece blank 2 is inserted into the tube of the inner cavity sleeve 3. The port of the inner cavity sleeve 3 for inserting the workpiece blank 2 is set as a trumpet-shaped structure.

[0025] The inner sleeve 3 is fitted with the center hole 101. Since the workpiece blank 2 needs to be repeatedly inserted and removed, the insertion hole may be worn. Therefore, by setting the inner sleeve 3 of nylon material, the surface of the product can be protected and the product will not have surface quality problems such as scratches or abrasions.

[0026] Furthermore, the gear-shaped protrusion 204 on the side wall of the hole position ring 201 is located between the gaps of two adjacent limiting blocks 102. The protrusion 204 is provided with a first arc groove die hole 205 that penetrates the hole position ring 201 and the workpiece blank 2. A raised ring 203 is also provided on the ring surface of the hole position ring 201. A second arc groove die hole 202 is provided on the side wall of the raised ring 203. Multiple sets of the second arc groove die holes 202 are equally spaced around the side wall of the raised ring 203. The first arc groove die hole 205 coincides with the second arc groove die hole 202 in the axial direction of the workpiece blank 2. The first arc groove die hole 205 is located in the gap between adjacent limiting blocks 102. The workpiece blank 2 needs to be machined with two sets of 8-R2 arc grooves, including the first arc groove mold hole 205 and the second arc groove mold hole 202. Therefore, by limiting the concave and convex gear structure of the workpiece blank 2, the convex part 204 is clamped and limited in the gap between the adjacent limiting blocks 102, thereby avoiding the shaking of the workpiece blank 2 during processing and improving the processing accuracy.

[0027] After the reference surface of the workpiece blank 2 abuts and is limited by the end of the fixed sleeve 1, the height of the protruding ring 203 is higher than the height of the limiting block 102, so that the circumference of the protruding ring 203 can be processed without changing the tooling, reducing the processing steps and improving efficiency.

[0028] Furthermore, a fixing hole 103 is provided on the side wall of the tube body of the fixing sleeve 1. The fixing hole 103 and the center hole 101 are connected through the fixing hole 103. A fixing screw 104 is provided in the fixing hole 103. The fixing screw 104 and the thread provided in the inner wall of the fixing hole 103 form an adjustable thread engagement. The workpiece blank 2 is fixedly connected to the fixing sleeve 1 by the abutment of the fixing screw 104.

[0029] When the workpiece blank 2 is inserted into the center hole 101, the tail end of the workpiece blank 2 extends to the position where it passes through the fixing hole 103. Then, by screwing in the fixing screw 104, the tail end of the workpiece blank 2 is pushed against the side wall of the center hole 101, thereby achieving a fixing effect.

[0030] Furthermore, such as Figure 5 As shown, a protruding locking ring 105 is also provided on the outer wall of the fixed sleeve 1. When the fixed sleeve 1 is clamped, the locking ring 105 can play a positioning role by limiting the clamping, avoiding clamping deviation, and at the same time avoiding clamping too deeply, which would cause the processing position to get close to the fixture and affect the process.

Claims

1. A machining fixture for thin-walled aerospace shaft parts, characterized in that: The device includes a fixed sleeve (1) and a tubular workpiece blank (2). The fixed sleeve (1) is provided with a central hole (101) for inserting the workpiece blank (2). The workpiece blank (2) is a hollow tubular structure. A hole position ring (201) is provided on the workpiece blank (2). The side wall of the hole position ring (201) is configured as a gear-shaped structure with concave and convex shapes. A protruding limiting block (102) is provided at the end of the fixed sleeve (1) that abuts and limits the hole position ring (201). The limiting blocks (102) are arranged in a spaced circular array at the end of the fixed sleeve (1). The limiting blocks (102) and the recess of the gear-shaped structure on the side wall of the hole position ring (201) form an interlocking limiting.

2. The machining fixture for thin-walled aerospace shaft parts according to claim 1, characterized in that: An inner cavity sleeve (3) is also provided inside the central hole (101). The inner cavity sleeve (3) is a tubular structure embedded in the central hole (101). The workpiece blank (2) is inserted into the tube of the inner cavity sleeve (3). The port of the inner cavity sleeve (3) for inserting the workpiece blank (2) is set as a trumpet-shaped structure.

3. The machining fixture for thin-walled aerospace shaft parts according to claim 1, characterized in that: The protrusion (204) of the gear-shaped structure on the side wall of the hole position ring (201) is located between the gaps of two adjacent limiting blocks (102). The protrusion (204) is provided with a first arc groove die hole (205) that penetrates the hole position ring (201) and the workpiece blank (2). The ring surface of the hole position ring (201) is also provided with a raised ring (203). The side wall of the raised ring (203) is provided with a second arc groove die hole (202). The second arc groove die hole (202) is provided in multiple sets at equal intervals around the side wall of the raised ring (203). The first arc groove die hole (205) coincides with the second arc groove die hole (202) in the axial direction of the workpiece blank (2). The first arc groove die hole (205) is located in the gap between adjacent limiting blocks (102).

4. The machining fixture for thin-walled aerospace shaft parts according to claim 1, characterized in that: The fixed sleeve (1) has a fixed hole (103) on its side wall. The fixed hole (103) and the center hole (101) are connected through each other. A fixed screw (104) is provided in the fixed hole (103). The fixed screw (104) and the thread provided in the inner wall of the fixed hole (103) form an adjustable thread engagement. The workpiece blank (2) is fixedly connected to the fixed sleeve (1) by means of the abutment of the fixed screw (104).

5. The machining fixture for thin-walled aerospace shaft parts according to claim 1, characterized in that: The outer wall of the fixed sleeve (1) is also provided with a protruding locking ring (105).

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