A special fixture for preventing deformation of an aero-engine casing shell cover during machining

Abstract

The utility model discloses an aviation engine casing shell block cover's anti -deformation processing special fixture belongs to aviation engine spare and part manufacturing technical field. The fixture includes the clamping body (1), the compression screw cap (2), the support (3) and the open sleeve (4). The clamping body (1) is equipped with the hole matching with the part outer circle, adopts H7 / g6 cooperation to realize accurate positioning, the compression screw cap (2) is connected with the clamping body thread, is used for the axial compression spare, the support (3) is fixed on the clamping body top through the bolt, and its support sleeve is adopted gap cooperation with the part high outer cylinder, provides radial support, the open sleeve (4) is the split type structure, is covered in high outer cylinder and is locked through the bolt and plays the supplementary support. The fixture through multiple anti -deformation design has solved 7075 aluminum alloy thin -walled spare processing deformation problem, has guaranteed high outer cylinder upper through -hole axis relative to the base outer circle axis position degree tolerance out -of -tolerance problem, makes the part qualified rate from less than 30% to improve to 95% above.

Description

Technical Field

[0001] This utility model relates to the field of aero-engine component manufacturing technology, specifically a special fixture for anti-deformation processing of aero-engine casing cover. Background Technology

[0002] The aero-engine casing cover is made of 7075 aluminum alloy with a thin-walled structure. Traditional machining methods can cause deformation due to cutting forces and clamping stresses, especially... On the outer cylinder Through hole axis relative to base The external cylindrical axis position tolerance is out of tolerance, with a pass rate of less than 30%. General-purpose fixtures cannot adapt to irregular contours and lack radial support structures. Utility Model Content

[0003] To address the problem of deformation during the processing of thin-walled parts, the purpose of this utility model is to provide a special fixture that suppresses deformation through precise positioning, radial support, and a split locking design.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a special fixture for anti-deformation processing of an aero-engine casing cover, comprising a fixture body, a clamping nut, a bracket, and an open sleeve; the fixture body is provided with... The inner hole is the same as the reference outer circle of the part. Precision fit and positioning; the clamping nut connects to the clamp body via a threaded connection, axially clamping the parts; the bracket is fixed above the clamp body by bolts, and enclosed by a sleeve. The tall cylinder provides radial support; the opening sleeve is a split structure that covers... The tall cylinder, secured with bolts, serves as an auxiliary support.

[0005] As a further preferred option, the height of the bracket sleeve Two-thirds of the height of the tall cylinder (e.g., 60mm);

[0006] As a further preferred embodiment, the inner wall of the opening sleeve is coated with a molybdenum disulfide anti-friction coating.

[0007] The beneficial effects of this utility model are: the H7 / g6 fit with the inner hole ensures positioning accuracy (≤0.03mm); the bracket effectively suppresses... Deformation and vibration of cylinders during drilling; split-type open bushings prevent bolts from directly damaging the surface of parts; part qualification rate increased from less than 30% to over 95%. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the part's structure;

[0009] Figure 2 Exploded view of the fixture;

[0010] Figure 3 For clamping diagram (part) (The outer circle fits into the inner hole of the fixture);

[0011] Figure 4 Schematic diagram of bracket installation (sleeve wrapping) (high cylinder);

[0012] Figure 5 This is a schematic diagram of an open sleeve structure;

[0013] Figure 6 Diagram showing the locking state of the open sleeve (split-type structure covering) (high cylinder);

[0014] Figure 7 This is a schematic diagram of the clamping body structure;

[0015] Figure 8 This is a schematic diagram of the structure of the clamping nut;

[0016] Figure 9 This is a schematic diagram of the support structure.

[0017] In the diagram: 1-clamp body; 2-clamping nut; 3-support; 4-open sleeve; 5-part Outer circle; 6-Inner hole; 7-Sleeve; 8- High cylinder; 9-M6 bolt; 10-Mounting surface; 11-Part; 12-Drill hole; 13-Base plate; 14-Boss; 15-Thread; 16-Mounting hole; 17-Stepped hole; 18-M10 bolt. Detailed Implementation

[0018] like Figure 1-5 As shown, a special fixture for anti-deformation machining of an aircraft engine casing cover includes a fixture body 1, a clamping nut 2, a bracket 3, and an open sleeve 4. The fixture body 1 is made of 40Cr material and undergoes heat treatment. The fixture body 1 is a base plate 13, and the base plate 13 has a boss 14 with an inner hole 6. The size of the inner hole 6 is... The top has a bracket mounting surface 10 with mounting holes 16; the clamping nut 2 is screwed into the clamp body thread 15, axially clamping the part 11; the bracket sleeve 7 has a stepped hole 17 inside, with an upper inner diameter of The lower inner diameter is and The high cylindrical 8 has a clearance fit; the open sleeve 4 is inserted into the stepped hole 17, and the outer diameter of the open sleeve 4 is... It fits with the stepped hole 17 with a clearance. The inner diameter of the open sleeve 4 is... The outer diameter of the open sleeve 4 matches the inner diameter of the sleeve 7, and the inner diameter of the open sleeve 4 matches the part. The high cylindrical sleeve 8 has a clearance fit. The sleeve 7 has a height of 60mm (≥2 / 3 of 85mm) and is fixed to the mounting surface 10 by bolts 18; the open sleeve 4 is a split two-half structure, with the inner wall coated with molybdenum disulfide and covered. The high cylindrical section 8 is then secured with an M6 bolt 9.

[0019] The clamping process is as follows:

[0020] ① Parts The outer circle is placed into the fixture. Inner hole 6 positioning;

[0021] ② Tighten the clamping nut (2) to fix it axially;

[0022] ③ Install bracket (3), sleeve wrapping Tall cylinder;

[0023] ④ Insert the open sleeve (4), tighten the bolt, and then drill a hole.

Claims

1. A special fixture for anti-deformation machining of an aero-engine casing cover, characterized in that: It includes a clamping body (1), a clamping nut (2), a bracket (3), and an open sleeve (4); The clamping body (1) is provided with a clamping device for the part The outer diameter matches the H7 / g6 inner hole; The clamping nut (2) is threadedly connected to the clamping body (1) and is used to axially clamp the parts; The bracket (3) is fixed above the clamping body (1) by bolts, and the inner diameter of its sleeve is the same as that of the part. High cylindrical clearance fit; The opening sleeve (4) is a split structure that covers the part. The outer side of the tall cylinder is radially locked with bolts.

2. The special fixture according to claim 1, characterized in that: The sleeve height of the bracket (3) is ≥ the part Two-thirds of the height of the tall cylinder.

3. The special fixture according to claim 1, characterized in that: The inner wall of the opening sleeve (4) is provided with a friction-reducing coating.

Images