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A Stress Detection Method for Bolt Joints of Machine Tools

A stress detection and connection technology, applied in the direction of measuring force, measuring device, instrument, etc., can solve the problems of harsh test conditions, complex process and narrow application range.

Inactive Publication Date: 2016-08-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for detecting the stress at the bolted joints of machine tools. Technical problems in the stress detection method such as complex process, expensive equipment, harsh test conditions, and narrow scope of application

Method used

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  • A Stress Detection Method for Bolt Joints of Machine Tools
  • A Stress Detection Method for Bolt Joints of Machine Tools
  • A Stress Detection Method for Bolt Joints of Machine Tools

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] S1: Equipment preparation.

[0059] Prepare the following equipment: BE120-2BC three-way strain gauge, DH3816N static strain tester, temperature compensation block, notebook computer, 502 glue, electric soldering iron, solder, rosin, absolute alcohol, stainless steel tweezers, absorbent cotton, coarse sandpaper, metallographic Sandpaper, shielded wire, steel ruler, scribing needle, torque wrench, the bed and column of the μ2000 / 400H horizontal machining center produced by Beijing Gongyan Precision Machinery Co., Ltd., 26 M16 bolts, and the column is assembled to the bed by bolts Body. Among them, the material of the temperature compensation block is the same as the material of the column connected by the bolt, and both are HT150 (ie gray iron 150). The schematic diagram of the plane structure of the BE120-2BC three-way strain rosette is as follows figure 1 As shown, the resistors are respectively arranged along the directions with the angles of 0°, 45°, and 90° with respe...

Embodiment 2

[0084] This embodiment is the same as embodiment 1, except that:

[0085] In S2, use absorbent cotton to clean the test surface, use absorbent cotton balls dipped in acetone to clean the surface of the patch to remove dirt, and replace the absorbent cotton balls repeatedly until there is no stain on the surface;

[0086] In S2, the short-term insulation resistance of the joint between the strain rosette and the machine tool and the joint between the strain rosette and the column is detected. Since the test time is 6 days, the resistance of the test is greater than 20MΩ.

[0087] In S4, before testing, the static strain tester is energized for 15 minutes, preheated, and then the static strain tester is balanced.

Embodiment 3

[0089] This embodiment is the same as embodiment 1, except that:

[0090] In S4, before testing, the static strain tester is energized for 20 minutes, preheated, and then the static strain tester is balanced.

[0091] Figure 5 with Image 6 They are respectively the principal stress curve diagram detected at the measuring point on the column and the principal stress curve diagram obtained at the measuring point on the bed in the embodiment of the present invention. This is the test result obtained in Example 3 of the present invention. It can be seen from the maximum principal stress curve of the bed and the column that different bolt assembly processes have a great influence on the stress field distribution of the bed column connection. In the second method of assembly process, the stress field caused by the bolt connection assembly The distribution is relatively uniform, and the fluctuations between the measurement points are not as great as the method. In comparison, the meth...

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Abstract

The invention discloses a method for detecting the stress at the bolt connection of a machine tool, which includes five steps. Step S1 is equipment preparation, including preparing a temperature compensation block and a static strain tester for strain testing; step S2 is test preparation, including preparing the bolt connection and The surface of the temperature compensation block is flattened and cleaned, and the strain rosettes are pasted and the pins are welded; step S3 is instrument connection and parameter setting, including connecting the wires connected to the strain rosettes through the pins to the static strain tester, Grounding the ground terminal of the static strain tester and connecting the test terminal to a computer, and setting the parameters of the static strain tester; step S4 is strain detection; step S5 is data processing. The method of the invention is simple and easy to operate, applicable to the field, has low requirements on the environment, and has high accuracy, and is applicable to the stress detection of materials satisfying the elastic-plastic theory.

Description

Technical field [0001] The invention belongs to the field of stress detection, and more specifically, relates to a method for stress detection at a bolt connection of a machine tool. Background technique [0002] With the development of machine tools in the direction of high speed, high precision and high efficiency, the dynamic performance of machine tools has attracted widespread attention from researchers. Research shows that more than 60% of vibration problems on machine tools originate from the joint, and more than 90% of the damping value also originates from the joint. The dynamic characteristics of large parts in the machine tool structure after assembly, including natural frequency, modal damping, and modal shape, are greatly affected by assembly stress. [0003] At present, stress testing methods are mainly divided into two types: destructive and non-destructive. Among them, destructive testing methods include drilling method, strip-taking method, grooving method, peelin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/22
Inventor 毛宽民陈奇兵张赛李斌
Owner HUAZHONG UNIV OF SCI & TECH
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