Split bridge type support tooling for friction stir welding of narrow hollow structures

Abstract

The application discloses a split bridge type support tool for friction stir welding of narrow hollow structure, which is used for friction stir welding of a hollow structure with double-sided welds. The tool comprises a left bridge type support block, a plurality of sawtooth engagement transmission blocks, a right bridge type support block and left and right pressing blocks. The left and right bridge type support blocks serve as the main body of support bearing, engage with the sawtooth engagement transmission blocks through sawtooth-shaped end surfaces, and utilize the wedge-shaped tensioning force of the left and right pressing blocks and the bridge type support blocks to enable the left and right bridge type support blocks and the sawtooth engagement transmission blocks to be closely engaged to form an integrated support, so that the upper end surface forms a flat support surface, thereby providing back support for the friction stir welding of the upper hollow position, and the lower part is spaced apart from the lower surface of the hollow structure by a certain space, so that each split block part of the tool can be conveniently disassembled from the narrow space.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of welding technology, in particular to a split bridge type support tool for friction stir welding of narrow hollow structure. BACKGROUND

[0002] Part of the hollow structure cannot be machined due to space problems, and can only be removed by back processing, and then welded with the base plate through the back to form a hollow structure. Usually such hollow structures have sealing performance requirements, and the front surface also usually needs to be welded with the cover plate to form a hollow flow channel through structure. For such structure sealing welding, due to the characteristics of low heat input and high strength of friction stir welding, it is widely used in such structures.

[0003] The hollow structure through part is usually narrow in space, and cannot be supported by the whole backing plate during back friction stir welding, so the backing block tool cannot be inserted into the assembly and cannot be disassembled as a whole. The design of split backing plate will cause the backing block and the structure to be tightly assembled due to the rigid support problem of friction stir welding, and the upsetting force in the welding process will cause the backing plate and the base to be bonded, so it is extremely difficult to disassemble.

[0004] It can be seen that in order to adapt to the manufacturing of such narrow hollow structure, solve the quick disassembly of friction stir welding block tool, and play a rigid support role, the shape, bearing and load transmission of split tool must be designed, which can achieve quick assembly and disassembly in narrow space, avoid tight bonding with the base, and support the load from the outside support position to the middle suspended position. SUMMARY

[0005] The purpose of the present application is to realize the friction stir welding manufacturing of narrow hollow structure, which can solve the problem that traditional machining cannot process hollow structure due to space limitation, and can only form hollow structure by back processing + front and back friction stir welding. The friction stir welding of hollow structure has the characteristics of split type and bridge type support, and the upper part of the left and right blocks of the bridge type support part directly provides the support force of the welding back surface. The middle of the bridge is a sawtooth transmission block, which can be one or more, and the lower part of the hollow part does not contact the base and is suspended. The support load is transmitted to the center of the bridge by using the bridge principle. In this way, the split tool can only provide support force by tightly fitting with the lower base, and the problem of difficult disassembly of the split tool after welding is solved.

[0006] The present application provides a kind of tooling comprising bridge type support left block, sawtooth occlusion transmission block, bridge type support right block and left, right block of jacking up composition.Bridge type support left, right block as the main body of support load, with sawtooth occlusion transmission block through sawtooth end surface occlusion, utilize left and right jacking up block and bridge type support block wedge tensioning force so that left and right bridge type support block, sawtooth occlusion transmission block can be mutually tightly occluded to form integral bridge type support, upper end surface forms flat support surface, to provide back support for upper hollow position, the middle part of bridge type tooling friction stir welding, and the lower part of bridge type tooling is suspended structure with a certain space from the lower surface of hollow structure matrix, the block parts of tooling can be conveniently disassembled from narrow space.

[0007] Compared with the prior art, the present application has the following advantages:

[0008] 1, bridge type split design, utilize bridge type structure to provide support, without contact with the lower part of matrix, without the need for lower matrix to provide support force, lower part is suspended structure, without tensioning and sticking with lower matrix, facilitate quick disassembly, improve disassembly efficiency and reduce disassembly difficulty.

[0009] 2, the tooling provides an effective way for manufacturing of narrow space hollow structure, solves the problem that machining tool cannot enter the machining space, and also provides a tooling solution for machining + friction stir welding composite manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the schematic diagram of the principle of the present application.

[0011] Figure 2 is the specific composition of bridge type tooling.

[0012] Figure 3 is the schematic diagram of welding implementation.

[0013] 1 is hollow structure matrix, 11 is the lower part of matrix hollow part, 2 is bridge type tooling, 21 is bridge type support left block, 22 is bridge type support right block, 23 is sawtooth occlusion transmission block, 24 is left jacking up block, 25 is right jacking up block, 3 is stir head, 4 is cover plate, 5 is welding track DETAILED DESCRIPTION

[0014] To explain the technical content, structural features, purposes achieved and effects of the present application for narrow hollow structure friction stir welding split bridge type support tooling in detail, the following will be described in detail in combination with embodiments and drawings.

[0015] The application provides a split bridge type support tool for friction stir welding of narrow hollow structures, which comprises a bridge type support left block 21, a sawtooth engagement transmission block 23, a bridge type support right block 22, a left clamping block 24 and a right clamping block 25; the bridge type support left block 21 and the bridge type support right block 22 are engaged with the sawtooth engagement transmission block 23 through sawtooth end surfaces; the left clamping block 24 and the right clamping block 25 wedge the bridge type support left block 21 and the bridge type support right block 22 to tightly engage with each other and form an integrated support; the upper end surface of the integrated support is a flat support surface, and the lower part is spaced from the lower surface of the hollow structure to form a suspended structure; and the sawtooth engagement transmission block 23 can be one or more.

[0016] For the convenience of understanding, the specific use method of the application is described in combination with the drawings, which comprises the following steps:

[0017] S1, the bridge type tool 2 is divided into blocks and is loaded into the hollow structure base body 1; the tool does not contact the lower part 11 of the hollow part of the base body and is in a suspended state;

[0018] S2, the left and right clamping blocks 24 and 25 are loaded to tightly engage the bridge type support left block 21, the bridge type support right block 22 and the sawtooth engagement transmission block 23 to form an integrated bridge type support, and the upper end surface forms a flat support surface, thereby providing back support for the friction stir welding of the upper hollow position and the middle part of the bridge type tool;

[0019] S3, the cover plate 4 is loaded, the stirring head 3 is installed, and welding is performed along the welding track 5; the bridge type tool can provide rigid support for all parts of the upper weld.

[0020] S4, when disassembling, the screws of the left and right clamping blocks 24 and 25 are used to quickly disassemble the clamping blocks, and then the bridge type support blocks 21 and 22 and the sawtooth engagement transmission block 23 are sequentially disassembled.

[0021] The preferred embodiments of the application are only used to help explain the application and are not used to limit the protection scope of the application. The preferred embodiments of the application do not describe all the details and do not limit the application to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The embodiments are selected and described in detail in order to better explain the principles and practical applications of the application, so that those skilled in the art can well utilize the application. The application is limited by the claims and their entire scope and equivalents. After reading the content described in the application, those skilled in the art can make various modifications or changes to the application, and these equivalent changes and modifications also fall within the scope limited by the claims of the application.

Claims

1. A split bridge type support tooling for friction stir welding of a narrow hollow structure, characterized by, It comprises a bridge type support left block, a sawtooth occlusion transmission block, a bridge type support right block, a left clamping block and a right clamping block; the bridge type support left block and the bridge type support right block are occluded with the sawtooth occlusion transmission block through sawtooth end surfaces, and the left clamping block and the right clamping block wedge the bridge type support left block and the bridge type support right block to make the bridge type support left block, the sawtooth occlusion transmission block and the bridge type support right block occlude each other closely to form a bridge type support whole; The upper end surface of the bridge type support whole formed by the bridge type support left block, the sawtooth occlusion transmission block and the bridge type support right block occluding each other closely is a flat support surface, and the lower part is spaced from the lower surface of the hollow structure to form a suspended structure; The sawtooth occlusion transmission block is one or more.

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