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Torsion fatigue test method for spring steel wire and device

A technology for torsional fatigue and spring steel wire, applied in the field of spring steel wire torsional fatigue test method and device, can solve the problems of high test cost, major equipment accident, long test cycle, etc., to avoid mechanical wear, eliminate mechanical gap, improve Effects of security and stability

Active Publication Date: 2017-12-05
中机生产力促进中心有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the design defects of spring products, there are many cases of major equipment accidents caused by sudden fatigue fracture under harsh working conditions, and the economic losses and harm caused are incalculable. Therefore, it is very important to test the fatigue life of springs.
However, the currently widely used tension-compression fatigue test method has a long test period and high test cost, and cannot fully meet the requirements of reliability design and quality assurance of spring products at this stage.

Method used

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  • Torsion fatigue test method for spring steel wire and device
  • Torsion fatigue test method for spring steel wire and device
  • Torsion fatigue test method for spring steel wire and device

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Experimental program
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Embodiment 2

[0121] Embodiment 2, according to the above spring steel wire torsional fatigue test method, the present invention also discloses a spring steel wire torsional fatigue test device, the test device includes a drive system, a clamp system, preferably a hydraulic clamp system, a stationary end and a test bench four The driving mechanism includes a direct drive motor and an output spindle; the hydraulic fixture system includes a hydraulic chuck and a hydraulic pump station; the stationary end includes a torque sensor and a support frame; the test bench is configured to support the entire torsion device, which includes guide rails, preferably It is a linear guide rail, a guide rail slider, a positioning block and a test bench.

[0122] According to JB / T 9370-1999 "Technical Conditions for Torsion Testing Machines", the permissible errors of the indication values ​​of the torsion angle of the testing machine should meet the following requirements:

[0123] a. The maximum permissible...

Embodiment 3

[0251] As a specific embodiment of the present invention, this paper proposes to use the torsional fatigue test of steel wire to replace the tension and compression fatigue test of spring. The specific test requirements are as follows, refer to GB / T16947-2009 "Code for Fatigue Test of Helical Springs".

[0252] Such as Figure 9 As shown, the operation process is as follows:

[0253] The first step: turn on the power; the second step: start the PLC control system; the third step: select the spring steel wire test piece; the fourth step: fix the test piece on the test device; Enter the sixth step, if the slip test is not passed, go to the fourth step to re-fix the specimen; the sixth step: input parameters for the selected test mode; the seventh step: start the test, start the test program, and load the specimen force, so that the test piece does reciprocating torsional movement under the loading force; the eighth step: judge whether the number of torsion times under the loadi...

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Abstract

The invention discloses a torsion fatigue test method for a spring steel wire and a device thereof. By setting of a steel wire test piece, a spring tension-compression fatigue test is equivalent to a torsion fatigue test of the spring steel wire with same parameters. According to the test method, the steel wire test piece is same in size with the steel wire for preparation of a spring product, compared with a material-based rotating bending fatigue test method, the torsion fatigue test method can meet requirements of dimensional factors in the fatigue test, correction factors can be reduced, more reliable results can be obtained, compared with a product-based tension-compression fatigue test method, the torsion fatigue test method has significant advantages in high-stress and large-amplitude test requirements. The test device can meet high frequency long period requirements in the process of the torsion fatigue test method by setting of a spring clamper for clamping and a part rolling bearing and a round head flat key, the test device is safe and reliable in the operation process of the test, a direct-drive servo drive system is used as a transmission mode, and safety and stability of long-period work of the test device can be enhanced.

Description

technical field [0001] The invention relates to the technical field of spring fatigue tests, in particular to a spring steel wire torsional fatigue test method and a device thereof. Background technique [0002] The spring industry is a very important basic industry in the national industrial economy. In industries such as automobiles, electrical appliances and electronics, railways, aerospace, and energy, springs are indispensable and key basic components. [0003] Under actual working conditions, most springs work under alternating loads, and their working stress is lower than the yield strength of the material. The spring works under alternating load, and the phenomenon of failure after long-term operation is fatigue damage. According to statistics, more than 80% of spring failures are caused by fatigue, most of which are sudden fractures. With the development of modern machinery in the direction of high speed and large size, spring products operate under harsh working...

Claims

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Application Information

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IPC IPC(8): G01N3/26
CPCG01N3/26G01N2203/0208G01N2203/0073G01N2203/028G01N2203/0005G01N2203/005
Inventor 王德成邵晨曦程鹏
Owner 中机生产力促进中心有限公司
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