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Machine tool bolt connection position stress measurement method

A technology for stress detection and joints, applied in the direction of measuring force, measuring devices, instruments, etc., can solve problems such as harsh test conditions, complicated processes, and narrow scope of application

Inactive Publication Date: 2014-11-26
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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  • Machine tool bolt connection position stress measurement method
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  • Machine tool bolt connection position stress measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] S1: equipment preparation.

[0055] Prepare the following equipment: BE120-2BC three-way strain rosette, 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, scribe, torque wrench, the bed and column of the μ2000 / 400H horizontal machining center produced by Beijing Gongyan Precision Machinery Co., Ltd., 26 M16 bolts, use the bolts to assemble the column to the bed body. Among them, the material of the temperature compensation block is the same as that of the column connected by bolts, both are HT150 (namely gray iron 150). The plane structure diagram of BE120-2BC three-way strain rosette is as follows figure 1 As shown in , resistances are respectively arranged along directions with angles of 0°, 45° and 90° with X, and the resistances will change with their o...

Embodiment 2

[0080] This embodiment is the same as Embodiment 1, the difference is:

[0081] In S2, use absorbent cotton to clean the test surface, use absorbent cotton ball dipped in acetone to clean the surface to be patched to remove dirt, and replace the absorbent cotton ball repeatedly until there is no stain on the surface;

[0082] In S2, the short-term insulation resistance of the joint between the strain rosette and the machine tool and the connection between the strain rosette and the column is detected. Since the test time is 6 days, the resistances obtained from the test are greater than 20MΩ.

[0083] In S4, before the test, the static strain tester is powered on for 15 minutes to preheat, and then the static strain tester is balanced.

Embodiment 3

[0085] This embodiment is the same as Embodiment 1, the difference is:

[0086] In S4, before the test, the static strain tester is powered on for 20 minutes to preheat, and then the static strain tester is balanced.

[0087] Figure 5 with Image 6 They are respectively the principal stress curves detected at the measuring points on the column and the principal stress curves detected at the measuring points on the bed in the embodiment of the present invention. It is the test result obtained in Example 3 of the present invention. From the maximum principal stress curves of the bed and column, it can be seen that different bolt assembly processes have a great influence on the stress field distribution of the bed column connection. Under the second assembly process, the stress field caused by the bolt connection assembly The distribution is relatively uniform, and the fluctuation between each measuring point is not as large as that of the method. In comparison, the assembly ...

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Abstract

The invention discloses a machine tool bolt connection position stress measurement method. The method includes the following five steps of 1, preparing equipment, wherein a temperature compensation block and a static strain tester for testing strain are prepared, 2, preparing for test, wherein the bolt connection position and the surface of the temperature compensation block are leveled and cleaned, a strain rosette is arranged in a pasted mode, and pins are welded, 3, connecting the tester and setting parameters, wherein wires connected with the strain rosette through the pins are connected to the static strain tester, the ground terminal of the static strain tester is grounded, the test terminal of the static strain tester is connected with a computer, and the parameters of the static strain tester are set, 4, measuring strain and 5, processing data. The method is simple in operation, easy to implement, applicable to a site, low in the requirement for the environment, high in accuracy and suitable for stress measurement of materials conforming to 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 detecting stress at a bolt joint 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 of researchers. Studies have shown that more than 60% of the vibration problems on the machine tool come from the joint, and more than 90% of the damping value also comes from the joint. The dynamic characteristics of the assembled large parts in the machine tool structure, including natural frequency, modal damping, and mode shape, are greatly affected by the assembly stress. [0003] At present, the stress test methods are mainly divided into two types: destructive and non-destructive. Among them, the destructive test methods include drilling method, strip method, grooving method, peeling m...

Claims

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Application Information

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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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