Test block and tool device for testing fatigue life of machined surface of metal part

Abstract

The utility model discloses a test block and tooling device for testing the fatigue life of the processing surface of a metal part, which comprises a test block, a fixing tooling and a pressing assembly, the top of the test block is provided with a weakening notch, one end of the test block is provided with a second connecting hole, and the fixing tooling comprises a base and a fixing block fixedly connected to the top of one end of the base. A second connecting hole is formed in the test block, a first connecting hole is formed in the position, corresponding to the second connecting hole, of the fixed block, and a first fixing bolt penetrates through the first connecting hole and the second connecting hole to be connected and fixed between the test block and the fixed block. Therefore, the test block is subjected to fatigue fracture at the weakening notch, the fracture positions of the test block are concentrated in the same area as far as possible, the lateral positioning block is used for limiting the lateral movement of the test block, the loading positions are the same, the stress distribution of the test block is consistent, and effective fatigue life data of a metal material processing surface can be quickly measured.

Description

Technical Field

[0001] The utility model relates to the technical field of metal parts testing, in particular to a test block and a tooling device for testing the fatigue life of a metal parts processing surface. Background Art

[0002] The number of stress cycles that a metal part experiences before fatigue failure is called fatigue life. Currently, fatigue life tests for metal parts require multiple test blocks. Only through multiple tests can accurate fatigue life data be measured. During the test, the loading position, fixed position, and stress distribution of the test blocks should be kept consistent as much as possible, so that effective fatigue life data can be statistically obtained. The current fatigue life tests for metal parts have the following shortcomings:

[0003] 1. The auxiliary device of the test fixture is insufficient, and the test block moves laterally to varying degrees during the test, resulting in changes in the loading position and different stress distribution of the test block;

[0004] 2. The fracture position of the test block is discrete, which is not conducive to the statistical analysis of fatigue life, so the fatigue life of the test block cannot be quickly obtained.

[0005] Therefore, it is particularly important to design a test block and a tooling device for testing the fatigue life of the machined surface of metal parts to solve the above-mentioned defects. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a test block and a tooling device for testing the fatigue life of a machined surface of a metal part, so as to solve the deficiencies in the background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A test block and a tooling device for testing the fatigue life of a metal part machining surface, comprising:

[0009] A test block, wherein a weakening notch is provided on the top of the test block, and a second connecting hole is provided at one end of the test block;

[0010] A fixing tool, the fixing tool comprising a base and a fixing block fixedly connected to the top of one end of the base, a first connecting hole is opened on the fixing block at a position corresponding to the second connecting hole, the test block and the fixing block are connected and fixed by a first fixing bolt passing through the first connecting hole and the second connecting hole, and the fixing tool also comprises side positioning blocks arranged on both sides of the test block;

[0011] A pressure applying assembly is used to apply a load to the test block.

[0012] Preferably, the side positioning block comprises a vertical plate and a connecting plate fixedly connected to the bottom of the vertical plate, the vertical plate and the connecting plate are vertically arranged, and one side of the vertical plate is pressed against the test block.

[0013] Preferably, a waist-shaped hole is provided on the connecting plate, and the connecting plate is fixedly connected to the base by a second fixing bolt passing through the waist-shaped hole.

[0014] Preferably, a stop gasket is provided between the second fixing bolt and the connecting plate and between the first fixing bolt and the fixing block.

[0015] Preferably, the pressure-applying assembly comprises a vertically arranged connecting rod, a connecting block is fixedly connected to the bottom of the connecting rod, a ball head is connected to the bottom end of the connecting block, and the ball head is located directly above the test block.

[0016] Preferably, a screw is fixedly connected to one side of the ball head, a through hole is opened on the connecting block near the bottom end, one end of the screw passes through the through hole and is threadedly connected to a locking nut, and the locking nut is pressed against the side wall of the connecting block.

[0017] Preferably, fixing holes are provided at the four corners of the base.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model arranges a weakening notch on the test block, and the stress at the weakening notch is maximum when loaded, so that fatigue fracture occurs at the weakening notch of the test block, and the fracture positions of the test block are concentrated in the same area as much as possible. The side positioning block is used to limit the lateral movement of the test block, so that the loading position is the same, the stress distribution of the test block is consistent, and the effective fatigue life data of the metal material processing surface can be measured quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the test block and tooling device for testing the fatigue life of the machined surface of metal parts;

[0021] Figure 2 This is a schematic diagram of the main structure of the test block and tooling device for testing the fatigue life of the machined surface of metal parts;

[0022] Figure 3 It is a schematic diagram of the fixed tooling structure;

[0023] Figure 4 Schematic diagram of the test block structure.

[0024] In the figure: 1. base; 11. fixing hole; 2. fixing block; 21. first connecting hole; 22. first fixing bolt; 3. test block; 31. weakening notch; 32. second connecting hole; 4. side positioning block; 41. vertical plate; 42. connecting plate; 421. waist-shaped hole; 422. second fixing bolt; 5. pressure assembly; 51. connecting rod; 52. connecting block; 53. ball head; 531. screw; 54. locking nut. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] Example:

[0027] See also Figure 1-Figure 4 The present embodiment provides a test block and a fixture device for testing the fatigue life of a metal part machining surface, including a test block 3, a fixing fixture and a pressure assembly 5. A weakening notch 31 is provided on the top of the test block 3, and the position and size of the weakening notch 31 are determined by CAE calculation. A second connecting hole 32 is provided at one end of the test block 3. The fixing fixture includes a base 1 and a fixing block 2 fixedly connected to the top of one end of the base 1. A first connecting hole 21 is provided on the fixing block 2 at a position corresponding to the second connecting hole 32. The test block 3 is connected and fixed to the fixing block 2 by a first fixing bolt 22 passing through the first connecting hole 21 and the second connecting hole 32. The fixing fixture also includes side positioning blocks 4 arranged on both sides of the test block 3. The pressure assembly 5 is used to apply a load to the test block 3. When testing the fatigue life of the metal part machining surface, The test block 3 is placed on the base 1, and the test block 3 is fixed on the fixed block 2 by the first fixing bolt 22 passing through the first connecting hole 21 and the second connecting hole 32, and then the side positioning blocks 4 on both sides are fixed on the sides of the test block 3, and a downward load in the form of a sine wave is applied to the test block 3 through the pressure component 5 to realize the test of the fatigue life of the processing surface of the test block 3. By setting a weakening notch 31 on the test block 3, the stress at the weakening notch 31 is maximum when loaded, so that fatigue fracture occurs at the weakening notch 31 of the test block 3, and the fracture positions of the test block 3 are concentrated in the same area as much as possible. The side positioning blocks 4 are used to limit the lateral movement of the test block 3, so that the loading positions are the same, the stress distribution of the test blocks is consistent, and the effective fatigue life data of the processing surface of the metal material can be measured quickly.

[0028] In this embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, the side positioning block 4 includes a vertical plate 41 and a connecting plate 42 fixedly connected to the bottom of the vertical plate 41, the connecting plate 42 and the vertical plate 41 are integrally formed, the vertical plate 41 and the connecting plate 42 are vertically arranged, one side of the vertical plate 41 is pressed against the test block 3, a waist-shaped hole 421 is opened on the connecting plate 42, and the connecting plate 42 is fixedly connected to the base 1 through the waist-shaped hole 421 by a second fixing bolt 422 passing through the waist-shaped hole 421, and the second fixing bolt 422 is loosened to release the fixing effect on the connecting plate 42 and the vertical plate 41, so that the position of the connecting plate 42 and the vertical plate 41 can be adjusted, so that the vertical plate 41 is tightly attached to the test block 3, and then the second fixing bolt 422 is tightened to fix the position of the connecting plate 42 and the vertical plate 41, so as to realize the lateral limiting effect on the test block 3.

[0029] In this embodiment, a stop washer is provided between the second fixing bolt 422 and the connecting plate 42 and between the first fixing bolt 22 and the fixing block 2 to prevent the first fixing bolt 22 and the second fixing bolt 422 from loosening.

[0030] In this embodiment, if Figure 1 and Figure 2 As shown, the pressure-applying assembly 5 includes a vertically arranged connecting rod 51, a connecting block 52 is fixedly connected to the bottom of the connecting rod 51, and the connecting block 52 is an inverted L-shaped structure. A ball head 53 is connected to the bottom of the connecting block 52, and the ball head 53 is located directly above the test block 3. The top of the connecting rod 51 is connected to the hydraulic cylinder pressure head and the sensor on the test bench. A downward load in the form of a sine wave is applied by the hydraulic cylinder, so that the connecting rod 51 drives the ball head 53 to hit the test block 3, and the number of load cycles when cracks are generated in the test block is recorded. After multiple tests, the test data is obtained, which is summarized and analyzed to quickly obtain the fatigue life data of the machined surface of the test block 3.

[0031] In this embodiment, if Figure 1 and Figure 2 As shown, a screw rod 531 is fixedly connected to one side of the ball head 53, a through hole is opened on the connecting block 52 near the bottom end, one end of the screw rod 531 passes through the through hole and is threadedly connected to a locking nut 54, and the locking nut 54 is pressed against the side wall of the connecting block 52. The ball head 53 is fixedly installed on the connecting block 52 by the screw rod 531 and the locking nut 54, which is convenient for quick disassembly and assembly of the ball head 53, so as to facilitate the replacement of the worn or damaged ball head 53.

[0032] In this embodiment, if Figure 3 As shown, fixing holes 11 are provided at the four corners of the base 1 , and bolts are passed through the fixing holes 11 to mount the base 1 on the workbench table of the test bench.

[0033] Working principle: When in use, place the test block 3 on the base 1, and then fix the test block 3 on the fixing block 2 by passing the first fixing bolt 22 through the first connecting hole 21 and the second connecting hole 32, and then loosen the second fixing bolt 422 to release the fixing effect on the connecting plate 42 and the vertical plate 41, so that the position of the connecting plate 42 and the vertical plate 41 can be adjusted, and the vertical plate 41 is pressed against the test block 3, and then the second fixing bolt 422 is tightened to fix the position of the connecting plate 42 and the vertical plate 41, and the side positioning block 4 can realize the lateral limiting effect on the test block 3, and the downward load in the form of a sine wave is applied by the hydraulic cylinder, so that the connecting rod 51 drives the ball The head 53 hits the test block 3, and the number of load cycles when the test block cracks is recorded. After multiple tests, the test data is obtained, and the fatigue life data of the processing surface of the test block 3 is quickly obtained by summarizing and analyzing. The utility model sets a weakening notch 31 on the test block 3, and the stress at the weakening notch 31 is maximum when loaded, so that the test block 3 undergoes fatigue fracture at the weakening notch 31, and the fracture positions of the test block 3 are concentrated in the same area as much as possible. The side positioning block 4 is used to limit the lateral movement of the test block 3, so that the loading position is the same, the stress distribution of the test block is consistent, and the effective fatigue life data of the processing surface of the metal material can be measured quickly.

[0034] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A test block and a tooling device for testing the fatigue life of a metal part machining surface, characterized in that: include: A test block (3), wherein a weakening notch (31) is provided at the top of the test block (3), and a second connecting hole (32) is provided at one end of the test block (3); A fixing tool, the fixing tool comprising a base (1) and a fixing block (2) fixedly connected to the top of one end of the base (1), a first connecting hole (21) being provided on the fixing block (2) at a position corresponding to the second connecting hole (32), the test block (3) and the fixing block (2) being connected and fixed by a first fixing bolt (22) passing through the first connecting hole (21) and the second connecting hole (32), the fixing tool further comprising side positioning blocks (4) arranged on both sides of the test block (3); A pressure applying assembly (5), wherein the pressure applying assembly (5) is used to apply a load to the test block (3).

2. A test block and fixture device for testing fatigue life of a metal part machining surface according to claim 1, characterized in that: The side positioning block (4) comprises a vertical plate (41) and a connecting plate (42) fixedly connected to the bottom of the vertical plate (41); the vertical plate (41) and the connecting plate (42) are arranged vertically; one side of the vertical plate (41) is pressed against the test block (3).

3. A test block and fixture device for testing fatigue life of a metal part machining surface according to claim 2, characterized in that: The connecting plate (42) is provided with a waist-shaped hole (421), and the connecting plate (42) is fixedly connected to the base (1) by a second fixing bolt (422) passing through the waist-shaped hole (421).

4. A test block and fixture device for testing fatigue life of a metal part machining surface according to claim 3, characterized in that: Stop washers are provided between the second fixing bolt (422) and the connecting plate (42), and between the first fixing bolt (22) and the fixing block (2).

5. A test block and fixture device for testing fatigue life of a metal part machining surface according to claim 1, characterized in that: The pressure-applying assembly (5) comprises a vertically arranged connecting rod (51), the bottom of the connecting rod (51) is fixedly connected to a connecting block (52), the bottom end of the connecting block (52) is connected to a ball head (53), and the ball head (53) is located directly above the test block (3).

6. A test block and fixture device for testing fatigue life of a metal part machining surface according to claim 5, characterized in that: A screw rod (531) is fixedly connected to one side of the ball head (53); a through hole is provided on the connection block (52) near the bottom end; one end of the screw rod (531) passes through the through hole and is threadedly connected to a locking nut (54); the locking nut (54) is pressed against the side wall of the connection block (52).

7. A test block and fixture device for testing fatigue life of a metal part machining surface according to claim 1, characterized in that: The four corners of the base (1) are each provided with fixing holes (11).

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