阅读说明：本技术 一种用于航空发动机钛合金薄壁钣焊大机匣的焊接夹具 (Welding fixture for large titanium alloy thin-wall metal plate welding case of aircraft engine ) 是由 袁术林 左治建 李雪梅 张晓华 谭小波 陈海筠 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种用于航空发动机钛合金薄壁钣焊大机匣的焊接夹具,包括底座、轴向设置在底座上的轴线支柱、设置在轴线支柱底端且位于筒体内的大端筒体装配涨紧机构、设置在轴线支柱顶端且位于筒体内的小端筒体装配涨紧机构、设置在筒体外侧且与所述大端筒体装配涨紧机构相对应的大端吸热刚性箍紧环组件以及设置在筒体外侧且与小端筒体装配涨紧机构相对应的小端吸热刚性箍紧环组件；其结构可靠,有效的解决了航空发动机钛合金薄壁钣焊大机匣焊接中材料和结构造成的焊接变形,通过增加热传递和刚性固定方案消除了安装边和筒体由于导热和刚性差异导致的变形,焊接后安装边和筒体错边满足要求,减少了零件废品率,大大降低生产成本,提高经济效益。(The invention discloses a welding fixture for a titanium alloy thin-wall metal plate welding large case of an aero-engine, which comprises a base, an axial strut axially arranged on the base, a large-end barrel assembling tensioning mechanism arranged at the bottom end of the axial strut and positioned in a barrel, a small-end barrel assembling tensioning mechanism arranged at the top end of the axial strut and positioned in the barrel, a large-end heat-absorbing rigid hoop component arranged outside the barrel and corresponding to the large-end barrel assembling tensioning mechanism, and a small-end heat-absorbing rigid hoop component arranged outside the barrel and corresponding to the small-end barrel assembling tensioning mechanism, wherein the large-end barrel assembling tensioning mechanism is provided with a large-end barrel assembling tensioning mechanism; the welding device has a reliable structure, effectively solves the welding deformation caused by materials and structures in the welding process of a large cartridge receiver for the titanium alloy thin-wall plate welding of an aero-engine, eliminates the deformation of the installation edge and the cylinder body due to the difference of heat conduction and rigidity by increasing the heat transfer and the rigid fixing scheme, meets the requirements of the installation edge and the cylinder body misalignment after welding, reduces the rejection rate of parts, greatly reduces the production cost and improves the economic benefit.)

1. The welding fixture for the large titanium alloy thin-wall plate welding case of the aircraft engine is characterized by comprising a base (1), an axial strut (2) axially arranged on the base (1), a large-end barrel assembling and tensioning mechanism (3) arranged at the bottom end of the axial strut (2) and positioned in a barrel, a small-end barrel assembling and tensioning mechanism (4) arranged at the top end of the axial strut (2) and positioned in the barrel, a large-end heat-absorbing rigid hooping ring assembly (5) arranged on the outer side of the barrel and corresponding to the large-end barrel assembling and tensioning mechanism (3), and a small-end heat-absorbing rigid hooping ring assembly (6) arranged on the outer side of the barrel and corresponding to the small-end barrel assembling and tensioning mechanism (4).

2. The welding fixture for the large-end barrel welding casing of the titanium alloy thin-wall plate of the aircraft engine as defined in claim 1, wherein the large-end barrel assembling tensioning mechanism (3) comprises a large-end barrel tensioning block (30) arranged on the base (1) and used for tensioning the large-end barrel and the mounting edge, a large-end conical tensioning block (31) and a large-end conical tensioning block pull rod (32) connected with the large-end conical tensioning block (31), the end part of the large-end conical tensioning block pull rod (32) far away from the large-end conical tensioning block (31) is provided with a large-end pressing member (33), the large-end conical tensioning block pull rod (32) drives the large-end conical tensioning block (31) to move axially and the large-end barrel tensioning block (30) to move radially, and the large-end conical tensioning block (31) is positioned by the large-end pressing member (33).

3. The welding fixture for the large titanium alloy thin-wall plate welding case of the aircraft engine as defined in claim 2, wherein the small-end cylinder assembly tensioning mechanism (4) comprises a small-end mounting side cover plate (40) arranged at the upper end of the cylinder and used for axially limiting the part, a small-end cylinder expansion block (41), a small-end conical expansion block (42) used for driving the small-end cylinder expansion block (41) to move radially, and a small-end pressing member (43) used for positioning the small-end conical expansion block (42).

4. The welding fixture for the large aero-engine titanium alloy thin-wall plate welding casing as claimed in claim 1, wherein the large end heat absorption rigid hoop assembly (5) and the small end heat absorption rigid hoop assembly (6) each comprise a first heat absorption rigid semi-hoop (44) and a second heat absorption rigid semi-hoop (45) which are in a semicircular structure, and fixing assemblies (46) respectively arranged at two ends of the first heat absorption rigid semi-hoop (44) and the second heat absorption rigid semi-hoop (45), and the first heat absorption rigid semi-hoop (44) and the second heat absorption rigid semi-hoop (45) are respectively attached to the outer wall of the cylinder body and are fastened through the fixing assemblies (46) to form an annular structure attached to the outer wall of the cylinder body.

5. The welding fixture for the large titanium alloy thin-wall sheet welding case of the aircraft engine as claimed in any one of claims 1 to 4, wherein a protective tube (7) is arranged at the position where the cylinder body is connected with the mounting surface, and protective gas is delivered to the back of the welding seam through the protective tube (7).

6. The welding fixture for the large case welded by the titanium alloy thin-wall plate of the aircraft engine according to claim 3, wherein each of the small-end cylinder expansion block (41) and the large-end cylinder expansion block (30) comprises an expansion block body (410), an expansion block rod body (411) connected with the expansion block body (410), and a fixed block (412) arranged on the expansion block rod body (411) and spaced from the expansion block body (410), and spring rods (413) are respectively arranged between two ends of the expansion block body (410) and two ends of the fixed block (412).

7. The welding fixture for the large titanium alloy thin-wall plate welding casing of the aircraft engine as claimed in claim 4, wherein said fixing component (46) comprises a stud and a nut which is connected to the stud in a matching way, and the stud respectively penetrates through two ends of the first heat-absorbing rigid semi-clamping ring (44) and the second heat-absorbing rigid semi-clamping ring (45) and is locked by the nut.

8. The welding fixture for the large case of the titanium alloy thin-wall plate welding of the aircraft engine as defined in claim 6, wherein the large-end pressing member (33) and the small-end pressing member (43) both adopt gland nuts.

Technical Field

The invention relates to the technical field of aero-engines, in particular to a welding fixture for welding a large case on a titanium alloy thin-wall plate of an aero-engine.

Background

The titanium alloy thin-wall sheet welding large case type parts are parts on an aero-engine and are important external case parts of the engine. The titanium alloy thin-wall sheet welding large case type part is formed by welding a titanium alloy forging mounting edge and a hot forming sheet metal part. The titanium alloy has small thermal conductivity (poor thermal conductivity) and small linear expansion coefficient, and the mounting edge has small deformation due to large thickness and small thermal conductivity; the wall thickness of the sheet metal part is thin, so that the heat conduction is poor, the rigidity is poor, the deformation of the cylinder body is large, the deformation of the cylinder body and the deformation of the installation edge are inconsistent, the misalignment after welding is large, the welding stress is large, and the strength and the service life of parts are reduced.

Disclosure of Invention

In order to solve the technical problem, the invention provides a welding fixture for welding a large case by a titanium alloy thin-wall plate of an aero-engine.

The technical scheme for solving the technical problems is as follows: a welding fixture for a titanium alloy thin-wall plate welding large case of an aircraft engine comprises a base, an axial strut axially arranged on the base, a large-end barrel assembling and tensioning mechanism arranged at the bottom end of the axial strut and located in a barrel, a small-end barrel assembling and tensioning mechanism arranged at the top end of the axial strut and located in the barrel, a large-end heat-absorption rigid hooping ring assembly arranged outside the barrel and corresponding to the large-end barrel assembling and tensioning mechanism, and a small-end heat-absorption rigid hooping ring assembly arranged outside the barrel and corresponding to the small-end barrel assembling and tensioning mechanism.

Furthermore, the big-end cylinder assembly tensioning mechanism comprises a big-end cylinder expansion block, a big-end conical expansion block and a big-end conical expansion block pull rod, wherein the big-end cylinder expansion block and the big-end conical expansion block pull rod are arranged on the base and used for tensioning the big-end cylinder and the mounting edge, the big-end conical expansion block pull rod is connected with the big-end conical expansion block, a big-end pressing piece is arranged at the end part, far away from the big-end conical expansion block, of the big-end conical expansion block pull rod, the big-end conical expansion block pull rod drives the big-end conical expansion block to move axially and the big-end cylinder expansion block to move radially, and the big-end conical expansion block is positioned through the big-end pressing piece.

Furthermore, the small-end cylinder assembly tensioning mechanism comprises a small-end mounting edge cover plate, a small-end cylinder expansion block, a small-end conical expansion block and a small-end pressing piece, wherein the small-end mounting edge cover plate is arranged at the upper end of the cylinder and used for axially limiting the parts, the small-end conical expansion block is used for driving the small-end cylinder expansion block to move radially, and the small-end pressing piece is used for positioning the small-end conical expansion block.

Furthermore, the large-end heat absorption rigid hooping ring assembly and the small-end heat absorption rigid hooping ring assembly respectively comprise a first heat absorption rigid semi-hooping ring and a second heat absorption rigid semi-hooping ring which are of semicircular structures, and fixing assemblies respectively arranged at two ends of the first heat absorption rigid semi-hooping ring and the second heat absorption rigid semi-hooping ring, wherein the first heat absorption rigid semi-hooping ring and the second heat absorption rigid semi-hooping ring are respectively attached to the outer wall of the cylinder body, and are fastened through the fixing assemblies to form an annular structure attached to the outer wall of the cylinder body.

Furthermore, a protective pipe is arranged at the joint of the cylinder and the mounting surface, and protective gas is conveyed to the back of the welding seam through the protective pipe.

Furthermore, the small-end cylinder expansion block and the large-end cylinder expansion block respectively comprise expansion block bodies, expansion block rod bodies connected with the expansion block bodies and fixing blocks arranged on the expansion block rod bodies and spaced from the expansion block bodies, and spring rods are respectively arranged between the two ends of the expansion block bodies and the two ends of the fixing blocks.

Further, the fixing assembly comprises a stud and a nut which is connected to the stud in a matching mode, and the stud penetrates through two ends of the first heat-absorbing rigid semi-tightening ring and two ends of the second heat-absorbing rigid semi-tightening ring respectively and is locked through the nut.

Further, the large-end pressing piece and the small-end pressing piece both adopt compression nuts.

The invention has the following beneficial effects: the welding fixture for the large titanium alloy thin-wall metal plate welding casing of the aero-engine, provided by the invention, has the advantages of reliable structure, convenience in operation, labor and time saving, effectively solves the welding deformation caused by materials and structures in the welding process of the large titanium alloy thin-wall metal plate welding casing of the aero-engine, eliminates the deformation of the installation edge and the cylinder body due to the difference of heat conduction and rigidity by increasing a heat transfer and rigid fixing scheme, meets the requirements on the installation edge and the cylinder body misalignment after welding, reduces the rejection rate of parts, greatly reduces the production cost and improves the economic benefit.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view taken along line A-A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 2;

FIG. 4 is a schematic view of the construction of the heat absorbing rigid cinching ring assembly of the present invention;

FIG. 5 is a schematic structural view of a small-end cylinder block or a large-end cylinder block according to the present invention;

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 to 3, a welding fixture for a titanium alloy thin-wall plate welding large casing of an aircraft engine includes a base 1, an axial strut 2 axially disposed on the base 1, a large-end cylinder assembling tensioning mechanism 3 disposed at the bottom end of the axial strut 2 and located in a cylinder, a small-end cylinder assembling tensioning mechanism 4 disposed at the top end of the axial strut 2 and located in the cylinder, a large-end heat-absorbing rigid hoop assembly 5 disposed outside the cylinder and corresponding to the large-end cylinder assembling tensioning mechanism 3, and a small-end heat-absorbing rigid hoop assembly 6 disposed outside the cylinder and corresponding to the small-end cylinder assembling tensioning mechanism 4.

The base 1 is a main body of the welding fixture and used for installing other parts of the whole fixture, and the large-end cylinder body assembling and tensioning mechanism 3 and the small-end cylinder body assembling and tensioning mechanism 4 are used for expanding the installation edge and the cylinder body to theoretical positions so as to ensure that parts are attached to the fixture. Increase the rigid subassembly of cramping of heat absorption at the barrel side, because titanium alloy warp great, this device rigidity restraint barrel in welding process, prevent that the deformation of part from passing through the inseparable laminating of big end heat absorption rigidity cramp ring subassembly 5 and tip heat absorption rigidity cramp ring subassembly 6 and barrel outer wall, can absorb the heat of barrel side, reduce the deformation that the heat piles up and causes, simultaneously with barrel rigidity restraint between welding jig and cramp ring, the barrel can not warp in the welding process, and the barrel, welding jig and the close laminating of the rigid subassembly three of cramping of heat absorption, increase the heat transfer speed of barrel side, reduce deformation and internal response. Welding deformation caused by materials and structures in the process of welding a large cartridge receiver of a titanium alloy thin-wall metal plate of an aero-engine is effectively solved, deformation of a mounting edge and a cylinder body due to difference of heat conduction and rigidity is eliminated by a scheme of increasing heat transfer and rigid fixing, the mounting edge and the cylinder body misalignment meet requirements after welding, the rejection rate of parts is reduced, production cost is greatly reduced, and economic benefits are improved.

The big-end cylinder assembly tensioning mechanism 3 comprises a big-end cylinder expansion block 30, a big-end conical expansion block 31 and a big-end conical expansion block pull rod 32 connected with the big-end conical expansion block 31, wherein the big-end cylinder expansion block 30 is arranged on the base 1 and used for tensioning the big-end cylinder and the mounting edge, the end part of the big-end conical expansion block pull rod 32, which is far away from the big-end conical expansion block 31, is provided with a big-end pressing piece 33, the big-end conical expansion block 31 is driven to move axially and the big-end cylinder expansion block 30 to move radially through the big-end conical expansion block pull rod 32, and the big-end conical expansion block 31 is positioned through the big-end pressing piece 33. The large-end cylinder expanding block 30 expands the large-end cylinder and the mounting edge to theoretical positions, and the main driving and driven principle is adopted, so that the heat dissipation of the cylinder and the mounting edge can be increased, and the contraction and deformation of parts can be reduced by rigid fixation. The big-end conical expansion block pull rod 32 drives the big-end conical expansion block 31 to move axially. The large-end conical expansion block pull rod 32 drives the large-end cylinder expansion block 30 to move radially, so that the assembly and disassembly of parts are facilitated. The large-end pressing member 33 employs a compression nut.

The small-end cylinder assembly tensioning mechanism 4 comprises a small-end mounting side cover plate 40, a small-end cylinder expansion block 41, a small-end conical expansion block 42 and a small-end pressing piece 43, wherein the small-end mounting side cover plate is arranged at the upper end of the cylinder and used for axially limiting parts, the small-end conical expansion block 42 is used for driving the small-end cylinder expansion block 41 to move in the radial direction, and the small-end pressing piece 43 is used for positioning the small-end conical expansion block 42. The small-end cylinder expanding block 41 expands the small-end cylinder and the mounting edge to theoretical positions, and the heat dissipation of the cylinder and the mounting edge can be enhanced by adopting a main-driven principle, and the contraction deformation of parts is reduced by rigid fixation. The small end mounting edge cover plate 40 compresses the parts, assembles the parts to a theoretical position and prevents the movement of the parts in the axial direction. The small-end conical expansion block 42 drives the small-end cylinder expansion block 41 to move in the radial direction, so that the parts can be conveniently assembled and disassembled. The small end pressing member 43 fixes the small end tapered expanding block 42 at a desired position. The small end pressing member 43 is a pressing nut.

As shown in fig. 4, each of the large-end endothermic rigid clamping ring assembly 5 and the small-end endothermic rigid clamping ring assembly 6 includes a first endothermic rigid half clamping ring 44 and a second endothermic rigid half clamping ring 45 which are in a semicircular structure, and fixing assemblies 46 respectively disposed at two ends of the first endothermic rigid half clamping ring 44 and the second endothermic rigid half clamping ring 45, and the first endothermic rigid half clamping ring 44 and the second endothermic rigid half clamping ring 45 are respectively attached to the outer wall of the cylinder body and are fastened by the fixing assemblies 46 to form an annular structure attached to the outer wall of the cylinder body. The fixing member 46 includes a stud and a nut coupled to the stud, and the stud penetrates through both ends of the first endothermic rigid half-clamping ring 44 and the second endothermic rigid half-clamping ring 45, respectively, and is tightened by the nut. The length of the stud can adapt to the change of the size of the part, and the barrel of each part is ensured to be precisely attached to the heat absorption rigid hooping ring device. The nut is matched with the stud for adjustment, so that the precise fit of the cylinder body of each part and the heat absorption rigid hooping ring assembly is ensured.

A protective pipe 7 is arranged at the joint of the cylinder and the mounting surface, and protective gas is conveyed to the back of the welding seam through the protective pipe 7. And inert gas Ar is conveyed to the back of the welding seam through a protection pipe 7, so that the oxidation in the part welding process is prevented.

As shown in fig. 5, each of the small-end cylinder expansion block 41 and the large-end cylinder expansion block 30 includes an expansion block body 410, an expansion block rod 411 connected to the expansion block body 410, and a fixing block 412 disposed on the expansion block rod 411 and spaced from the expansion block body 410, and spring rods 413 are respectively disposed between two ends of the expansion block body 410 and two ends of the fixing block 412. The position of the expansion block body 410 is adjusted by the elastic action of the spring rod 413, so that the use performance is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.