A design method for linear friction welding process test piece

Abstract

A method for designing a linear friction welding process test piece belongs to the field of welding technology. The method for designing a linear friction welding process test piece includes: designing a blade test piece, the blade test piece includes a blade welding portion and a blade clamping portion, and the shape and size of the welding surface one of the blade welding portion are the same as those of a real blade; designing a disk test piece, the disk test piece includes a disk welding portion and a disk clamping portion, the shape of the welding surface two of the disk welding portion is the same as the shape of the welding surface one of the blade welding portion, and the area of ​​the welding surface two is larger than the area of ​​the welding surface one, and welding the welding surface one to the welding surface two to obtain an integral blade disk test piece. The blade test piece and the disk test piece designed by the method for designing a linear friction welding process test piece can both withstand greater friction and impact forces, and when welded into an integral blade disk test piece, the metallurgical quality and dimensional accuracy of the weld joint between the blade test piece and the disk test piece can be improved.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, in particular to a design method for a linear friction welding process test piece. Background Art

[0002] Linear friction welding is a key manufacturing technology for integral bladed disk components. The linear friction welding process has a crucial impact on the final product quality. During the linear friction welding process, systematic errors such as equipment control errors and tooling manufacturing errors can easily lead to defects in the welded joints after welding. This results in poor repeatability of welding precision and a low part yield. When developing new linear friction welding processes, test pieces must be used, and the material and heat treatment conditions must match those of the component.

[0003] Conventional linear friction welding process test pieces generally use process test pieces with simple butt joint shapes, such as cube-shaped test pieces. These test pieces are different from the actual part structure and cannot reflect the actual welding interface conditions. During the welding process, the welding interface of this conventional process test piece is easily subjected to large friction and impact forces. Such a welding structure will result in insufficient frictional heat generation of the material at the initial stage of welding, and the friction resistance of the metal at the welding interface is large, causing the plastic metal at the welding interface to "become unstable" during the discharge process, which can easily cause metallurgical defects at the edge of the welding interface. In the middle stage of welding, the plastic metal extruded from the welding interface is randomly distributed on both sides of the joint, resulting in uneven heat dissipation of the weld joint, which in turn causes slight offsets in the weld dimensions of the parts. These dimensional errors directly affect the final dimensional accuracy of the weld joint.

[0004] Therefore, there is an urgent need for a design method for welding process test pieces that avoids the above technical problems, so as to obtain test pieces with improved metallurgical quality and dimensional accuracy of welded joints. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a design method for linear friction welding process test pieces. The designed blade test piece and disk test piece can withstand large friction and impact forces. When welded into an integral blade disk test piece, the metallurgical quality and dimensional accuracy of the welding joint between the blade test piece and the disk test piece can be improved.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A method for designing a linear friction welding process test piece is used to design an integral blisk test piece, wherein the integral blisk test piece is welded from a blade test piece and a disk body test piece. The method for designing a linear friction welding process test piece comprises the following steps:

[0008] S1. Design the blade test piece;

[0009] The blade test piece includes a blade welding portion and a blade clamping portion, wherein the shape and size of a welding surface of the blade welding portion are the same as those of a real blade;

[0010] S2. Design the disc test piece;

[0011] The disc test piece includes a disc welding portion and a disc clamping portion, wherein the shape of the second welding surface of the disc welding portion is the same as the shape of the first welding surface of the blade welding portion, and the area of ​​the second welding surface is larger than the area of ​​the first welding surface;

[0012] S3. Weld the first welding surface to the second welding surface to obtain an integral blade disk test piece.

[0013] Furthermore, the blade welding portion and the blade clamping portion are integrally formed.

[0014] Furthermore, the disc body welding portion and the disc body clamping portion are integrally formed.

[0015] Furthermore, the heights of the blade welding portion and the disc body welding portion are both 5-20 mm.

[0016] Furthermore, the blade clamping portion and the disc clamping portion are both rectangular parallelepiped structures.

[0017] Furthermore, the area of ​​the second welding surface of the disc welding portion is 10%-20% larger than the area of ​​the first welding surface of the blade welding portion.

[0018] Beneficial effects of the present invention:

[0019] 1) The design method of the linear friction welding process test piece of the present invention is used for the process research and development of integral blade disks of aircraft engines, which improves the process research and development efficiency of integral blade disk parts, improves the metallurgical quality and dimensional accuracy of the welded joints, and can meet the development needs of products.

[0020] 2) The present invention provides a method for researching the linear friction welding process of integral blade disk parts in the field of aero-engine manufacturing. This method can improve the efficiency of linear friction welding process research of parts, simplify the welding process test plan of integral blade disk parts, and further improve the metallurgical quality and dimensional accuracy of linear friction welded joints.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a method for designing a linear friction welding process test piece provided by an embodiment of the present invention;

[0023] Figure 21 is a schematic structural diagram of an integral blade disk test piece provided by an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the structure of a blade test piece provided by an embodiment of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a top view;

[0025] Figure 4 Schematic diagram of the structure of the disc test piece provided by the embodiment of the present invention, wherein (a) is the front view, (b) is the side view, and (c) is the top view

[0026] Figure 5 3 is a schematic diagram comparing the areas of welding surface 1 and welding surface 2 provided in an embodiment of the present invention.

[0027] The reference numerals in the drawings of the specification include:

[0028] 1-blade test piece, 2-disk test piece, 3-blade welding part, 4-blade clamping part, 5-disk welding part, 6-disk clamping part, 7-welding surface one, 8-welding surface two. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0031] In order to solve the problems existing in the prior art, such as Figures 1 to 5 As shown, the present invention provides a design method for a linear friction welding process test piece, which is used to design an integral blisk test piece. The integral blisk test piece is welded by a blade test piece 1 and a disk body test piece 2. The design method for the linear friction welding process test piece includes the following steps:

[0032] S1, design blade test piece 1;

[0033] The blade test piece 1 includes an integrally formed blade welding portion 3 and a blade clamping portion 4. The shape and size of the welding surface 7 of the blade welding portion 3 are the same as those of a real blade.

[0034] S2. Design disk test piece 2;

[0035] The disc test piece 2 includes an integrally formed disc welding portion 5 and a disc clamping portion 6. The shape of the second welding surface 8 of the disc welding portion 5 is the same as the shape of the first welding surface 7 of the blade welding portion 3. The area of ​​the second welding surface 8 of the disc welding portion 5 is larger than the area of ​​the first welding surface 7 of the blade welding portion 3.

[0036] In this embodiment, the area of ​​the second welding surface 8 of the disc welding portion 5 is 10%-20% larger than the area of ​​the first welding surface 7 of the blade welding portion 3. In actual operation, the second welding surface 8 of the disc welding portion 5 is enlarged by 10%-20% with reference to the contour of the first welding surface 7 of the blade welding portion 3.

[0037] S3. Weld the first welding surface 7 of the blade welding portion 3 to the second welding surface 8 of the disk body welding portion 5 to obtain an integral blade disk test piece.

[0038] During the specific design, a circumscribed rectangle is made based on the outline of the welding surface 1 7 of the blade welding part 3, and the circumscribed rectangle is stretched in the opposite direction along the normal of the welding surface into a cube to complete the optimized design of the blade test piece 1; a circumscribed rectangle is made based on the outline of the welding surface 2 8 of the disk welding part 5, and the circumscribed rectangle is stretched in the opposite direction along the normal of the welding surface into a cube to complete the optimized design of the disk test piece 2.

[0039] In this embodiment, the heights of the blade welding portion 3 and the disc body welding portion 5 are both 5-20 mm.

[0040] In this embodiment, the blade clamping portion 4 and the disc clamping portion 6 are both rectangular parallelepiped structures.

[0041] The principle of the design method of the linear friction welding process test piece of the present invention is as follows:

[0042] 1) The blade test piece 1 and the disc test piece 2 are designed with unequal welding surfaces.

[0043] An unequal area welding surface is used between the blade test piece 1 and the disk test piece 2. The welding surface of the blade test piece 1 is the same as the actual shape of the blade, and the welding surface area of ​​the blade test piece 1 is S0. The welding surface area of ​​the disk test piece 2 is larger than the welding surface of the blade test piece 1, and the welding surface area of ​​the disk test piece 2 is S1, and S0<S1. The cross-section of the weld joint between the blade test piece 1 and the disk test piece 2 presents an "unequal area" structure. The advantages of this structure are: First, the unequal area interface increases the rigidity and stability of the weld joint, and the weld joint is not easy to become unstable. Second, the unequal area interface ensures the consistency of the direction of the extruded metal during welding, which is conducive to ensuring the consistency of the temperature field of the weld joint, avoiding the random distribution problem of the extruded metal in the weld, improving the forming quality of the weld joint, and improving the stability of the weld joint quality.

[0044] 2) Rectangular block clamp design for blade test piece 1 and disk test piece 2

[0045] The clamping element between the blade test specimen 1 and the disk test specimen 2 utilizes a rectangular block clamping element. The advantages of this design are that the blade portion of the blade test specimen 1 is simulated using a simple cubic structure, while the circular disk portion of the disk test specimen 2 is simulated using a simple cubic structure. This simple cubic clamping element significantly reduces the preparation time and cost of the process verification specimen and improves the efficiency of test iterations. This design reduces the difficulty of processing the process verification specimen and improves the efficiency of process iterations.

[0046] The design method of the linear friction welding process test piece of the present invention not only ensures the iterative test quality of the linear friction welding process research, but also can significantly improve the efficiency of the process test and greatly reduce the test cost. Compared with the existing process test pieces of simple shape butt joints, it can more realistically simulate the state and parameters of the test piece and improve the dimensional accuracy of the welding joint.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for designing a linear friction welding process test piece, used for designing an integral blade disk test piece, characterized in that: The steps include: S1. Design the blade test piece; The blade test piece includes a blade welding portion and a blade clamping portion, wherein the shape and size of a welding surface of the blade welding portion are the same as those of a real blade; S2. Design the disc test piece; The disc test piece includes a disc welding portion and a disc clamping portion. The shape of the second welding surface of the disc welding portion is the same as the shape of the first welding surface. The area of ​​the second welding surface is larger than the area of ​​the first welding surface. The area of ​​the second welding surface is 10%-20% larger than the area of ​​the first welding surface. The blade clamping portion and the disc clamping portion are both rectangular parallelepiped structures; S3. Weld the first welding surface to the second welding surface to obtain an integral blade disk test piece.

2. The method for designing a linear friction welding process test piece according to claim 1, characterized in that: The blade welding portion and the blade clamping portion are integrally formed.

3. The method for designing a linear friction welding process test piece according to claim 1, characterized in that: The disc body welding portion and the disc body clamping portion are integrally formed.

4. The method for designing a linear friction welding process test piece according to claim 1, characterized in that: The heights of the blade welding portion and the disc body welding portion are both 5-20 mm.

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