Welding pre-deformation method and tool for air inlet casing of multi-supporting-plate welding structure

Abstract

The invention discloses a welding pre-deformation method and tool for an air inlet casing of a multi-supporting-plate welding structure. The pre-deformation tool comprises an inner model tire, an adjustable inner model block, a sliding block, an adjusting base, a driving block and an adjusting screw. The inner mold body is an annular piece, a plurality of through holes penetrating through the inner ring surface and the outer ring surface of the inner mold body are formed in the surface, making contact with the inner mold face of the air inlet casing, of the inner mold body, an adjustable inner mold block is slidably connected into each through hole, and the outer surface of each adjustable inner mold block serves as a supporting mold face making contact with the air inlet casing. The adjustable inner type block is installed in the adjusting base in a sliding mode through the sliding block and slides through the adjusting screw and the driving block. Before the air inlet casing is welded, reverse pre-deformation is generated by moving the adjustable inner type block in an area with large welding deformation, and after welding, the adjustable inner type block is in contact with the pre-deformation of the area, so that the air inlet casing is disassembled. The welding deformation of the air inlet casing can be improved, and meanwhile the problems that welded parts are not easy to disassemble and the surfaces of the welded parts are scratched are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a welding pre-deformation method for an air intake casing with a multi-plate welding structure and a design scheme of a tooling. Background Art

[0002] The air intake casing of an aircraft engine is generally welded by the air intake casing shell, the inner casing and a varying number of support plates. It is located at the front end of the aircraft engine and is generally made of titanium alloy. The main structure of the air intake casing of an aircraft engine is welded by the air intake casing shell and more than 10 support plates, and the inner casing is circumferentially spliced ​​by the lower edge plates of the support plates. The weld between the support plate and the air intake casing shell is welded by vacuum electron beam. According to the subsequent assembly and use requirements, higher requirements are put forward for the welding deformation of the air intake casing.

[0003] At present, the welding tooling of the air intake casing adopts an integral fixed inner tire solution, such as Figure 1 As shown, the inner mold material in the welding tool is non-magnetic stainless steel. The inner mold has the following problems during use: the air intake casing is difficult to disassemble after welding, and deep scratches are generated on the inner wall of the air intake casing shell.

[0004] Through analysis, it was found that the main reasons for the difficulty in disassembly and scratches on the inner wall are: after welding, the area between the two adjacent support plates on the intake casing shell produces a large concave deformation, and the intake casing fits tightly with the inner tire, thereby generating a large static friction force, which makes it difficult to disassemble the intake casing after welding. Forced disassembly will cause surface scratches. Summary of the invention

[0005] In view of the problems described in the background technology, the present invention aims to provide a welding pre-deformation method and tooling for an air intake casing with a multi-plate welded structure, which can improve the welding deformation of the air intake casing and solve the problems of difficult disassembly of parts and surface scratches after welding.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A welding pre-deformation method for an air intake casing of a multi-plate welding structure, comprising:

[0008] An inner mold tire is placed inside the air intake casing as a support during welding, and before welding, a force in the opposite direction of the welding deformation of the air intake casing is applied to the air intake casing through local deformation of the inner mold tire at a position where the welding deformation of the air intake casing is large, so as to drive the air intake casing to generate pre-deformation at this position, and after welding is completed, the local deformation of the inner mold tire is eliminated, so that the inner mold tire is separated from the air intake casing at this position.

[0009] As an option,

[0010] The air intake casing is made of titanium alloy;

[0011] The inner tire is made of non-magnetic stainless steel;

[0012] The air intake casing is welded by vacuum electron beam.

[0013] A welding pre-deformation tool for an air intake casing with a multi-plate welding structure, comprising:

[0014] The inner mold tire is a ring-shaped part. The surface of the inner mold tire that contacts the inner surface of the air intake casing is provided with multiple through holes that penetrate the inner ring surface and the outer ring surface of the inner mold tire. An adjustable inner mold block is slidably connected in each through hole. The outer surface of the adjustable inner mold block serves as a supporting surface that contacts the air intake casing.

[0015] Furthermore, the multi-plate welded structure air intake casing welding pre-deformation tooling also includes:

[0016] A slider, the slider is connected to the non-supporting profile of the adjustable inner block, and the slider has a first inclined surface;

[0017] An adjustment seat, the adjustment seat is located inside the inner ring surface of the inner mold tire, and a first sliding hole and a second sliding hole intersecting each other are opened on the adjustment seat, and the adjustable inner mold block is slidably connected in the first sliding hole through a slider;

[0018] The driving block is slidably connected in the second sliding hole, and a second inclined surface is provided at the end of the driving block, and the driving block contacts the first inclined surface of the slider through the second inclined surface.

[0019] As an option, the inner wall of the second sliding hole away from the intersection of the second sliding hole and the first sliding hole has an internal thread, and an adjusting screw is connected to the second sliding hole through the internal thread.

[0020] As an option, the supporting profiles of the adjustable inner blocks in different through holes are not completely the same.

[0021] As an option, the sliding direction of the adjustable inner block is consistent with the radial direction of the air intake casing or the length direction of the support plate.

[0022] Compared with the existing integral fixed inner mold welding tool and welding method, the present invention has the following advantages: 1) by taking the pre-deformation measure of the inner mold of the air intake casing, the concave deformation of the area between two adjacent support plates after welding is improved;

[0023] 2) By adopting an inner mold with adjustable contact surface position and size, the disassembly of the air intake casing and the welding tooling after welding is facilitated, thereby avoiding damage to the surface of the air intake casing during the disassembly process;

[0024] 3) The size and shape of the contact area at different positions of the inner mold tire can be adjusted according to the deformation of the trial product (i.e., the size and shape of the supporting surface of the adjustable inner mold block can be changed), so as to adapt to different deformation areas of the air intake casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the structural diagram of the integral inner tire welding tooling before improvement;

[0026] Figure 2 It is a welding pre-deformation tooling diagram of the present invention;

[0027] Figure 3 This is a schematic diagram of the pre-deformation of the adjustable inner block before welding;

[0028] Figure 4 This is a schematic diagram of the disassembly of parts after the adjustable inner block is welded;

[0029] In the figure, 1-inner tire; 2-adjustable inner block; 3-driving block; 6-adjusting screw. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0031] In order to improve the welding deformation of the air intake casing and solve the problem that the parts are not easy to disassemble after welding, the present invention is improved on the basis of the existing integral inner tire welding tooling, and the specific scheme is as follows:

[0032] The integral fixed inner mold tire 1 in the area where the air intake casing is more deformed is changed into an inner mold tire 1 which is deformable and movable in a partial area. Before welding, the air intake casing is clamped on the welding tooling and the inner mold tire 1, and the adjustable inner mold block 2 (as an inner support) in the area where the air intake casing is more deformed is pushed radially outward to cause a certain reverse deformation of the inner wall surface of the air intake casing in this area to offset the shrinkage and concave deformation produced during the welding process. At the same time, after welding, the adjustable inner mold block 2 as the inner support is moved radially inward to make the inner mold tire 1 and the air intake casing directly contactless, thereby solving the problem of difficult disassembly of the air intake casing and surface scratches after welding.

[0033] like Figure 2 to Figure 4As shown, the pre-deformation tooling for welding the air intake casing of the multi-bracket welding structure includes an inner mold 1, an adjustable inner mold block 2, a slider, an adjustment seat, a drive block 3 and an adjustment screw 4. The inner mold 1 is an annular part. The surface of the inner mold 1 in contact with the inner profile of the air intake casing is provided with a plurality of through holes penetrating the inner ring surface and the outer ring surface of the inner mold 1. An adjustable inner mold block 2 is slidably connected in each through hole. The outer surface of the adjustable inner mold block 2 serves as a supporting profile in contact with the air intake casing. The supporting profiles of the adjustable inner mold blocks 2 in different through holes are not completely the same. The sliding direction of the adjustable inner mold block 2 is consistent with the radial direction of the air intake casing or the length direction of the support plate. The slider is connected to the non-supporting surface of the adjustable inner block 2, and the slider has a first inclined surface; the adjustment seat is located on the inner side of the inner ring surface of the inner tire 1, and the adjustment seat is provided with a first sliding hole and a second sliding hole intersecting vertically, and the adjustable inner block 2 is slidably connected in the first sliding hole through the slider; the driving block 3 is slidably connected in the second sliding hole, and the end of the driving block 3 has a second inclined surface, and the driving block 3 contacts the first inclined surface of the slider through the second inclined surface. The second sliding hole has an inner thread on the inner wall of the hole away from the intersection of the second sliding hole and the first sliding hole, and an adjusting screw 4 is connected to the second sliding hole through the inner thread.

[0034] The implementation process of the welding pre-deformation method of the air intake casing with multiple plate welding structure designed by the present invention is as follows:

[0035] 1) Pre-deformation before welding:

[0036] Before welding, the air intake casing is mounted on the welding tool and pressed tightly, and the inner mold 1 is placed on the inner surface of the air intake casing. Figure 3 , and then the adjusting screw 4 is screwed down to move it downward. The adjusting screw 4 pushes the driving block 3 downward at this time, and the second inclined surface at the lower end of the driving block 3 pushes the first inclined surface of the slider, and finally drives the adjustable inner block 2 to move radially outward ( Figure 3 The air intake casing is deformed outward in the opposite direction.

[0037] 2) Eliminate pre-deformation after welding and disassemble the air intake casing:

[0038] After welding, the adjusting screw 4 is screwed in the opposite direction to move the adjusting screw 4 upward, leaving space for the driving block 3 to move downward. At this time, the adjustable inner block 2 moves radially inward when the stress in the intake casing is released ( Figure 4 The air intake casing is removed from the close contact state between the air intake casing and the adjustable inner block 2, thereby facilitating the removal of the air intake casing.

[0039] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A welding pre-deformation method for an air intake casing with a multi-plate welding structure, characterized in that: include: An inner mold tire (1) is placed inside the air intake casing as a support during welding, and before welding, a force in the opposite direction of the air intake casing welding deformation is applied to the air intake casing through local deformation of the inner mold tire (1) at a position where the air intake casing welding deformation is relatively large, so as to drive the air intake casing to generate pre-deformation at this position, and after welding is completed, the local deformation of the inner mold tire (1) is eliminated, so that the inner mold tire (1) is separated from the air intake casing at this position.

2. The method for welding pre-deformation of an air intake casing with a multi-plate welding structure according to claim 1, characterized in that: The air intake casing is made of titanium alloy; The inner tire (1) is made of non-magnetic stainless steel; The air intake casing is welded by vacuum electron beam.

3. A welding pre-deformation tool for an air intake casing with a multi-plate welding structure, characterized in that: include: The inner mold tire (1) is an annular part. The surface of the inner mold tire (1) in contact with the inner surface of the air intake casing is provided with a plurality of through holes penetrating the inner ring surface and the outer ring surface of the inner mold tire (1). An adjustable inner mold block (2) is slidably connected in each through hole. The outer surface of the adjustable inner mold block (2) serves as a supporting surface in contact with the air intake casing.

4. The welding pre-deformation tool for the air intake casing with a multi-plate welding structure according to claim 3 is characterized in that: Also includes: A sliding block, the sliding block being connected to the non-supporting profile of the adjustable inner profile block (2), the sliding block having a first inclined surface; An adjustment seat, the adjustment seat being located inside the inner annular surface of the inner mold tire (1), the adjustment seat being provided with a first sliding hole and a second sliding hole intersecting each other, and the adjustable inner mold block (2) being slidably connected in the first sliding hole via a slider; A driving block (3) is slidably connected in the second sliding hole, a second inclined surface is provided at the end of the driving block (3), and the driving block (3) contacts the first inclined surface of the sliding block through the second inclined surface.

5. The welding pre-deformation tool for the air intake casing with a multi-plate welding structure according to claim 4 is characterized by: The inner wall of the second sliding hole at the hole opening away from the intersection of the second sliding hole and the first sliding hole has an internal thread, and an adjusting screw (4) is connected to the second sliding hole through the internal thread.

6. The welding pre-deformation tool for the air intake casing with multiple plate welding structures according to claim 3 is characterized by: The supporting profiles of the adjustable inner profile blocks (2) in different through holes are not completely the same.

7. The welding pre-deformation tool for the air intake casing with a multi-plate welding structure according to claim 3 is characterized by: The sliding direction of the adjustable inner block (2) is consistent with the radial direction of the air intake casing or the length direction of the support plate.

Images