Lead screw thread bottom hardness micro-magnetic nondestructive detection method

A non-destructive testing and screw-tooth technology, applied in the direction of measuring device, material magnetic variable, material analysis by electromagnetic means, etc., can solve the problem that the depth of the hardened layer of the screw cannot be reflected, and reduce the influence of the skin effect of the material. The effect of shortened inspection time and non-destructive inspection

Inactive Publication Date: 2016-10-12
BEIJING UNIV OF TECH
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Problems solved by technology

The Barkhausen signal under a single excitation frequency cannot re

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  • Lead screw thread bottom hardness micro-magnetic nondestructive detection method
  • Lead screw thread bottom hardness micro-magnetic nondestructive detection method
  • Lead screw thread bottom hardness micro-magnetic nondestructive detection method

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Embodiment Construction

[0022] The steps of the micromagnetic nondestructive testing method mainly include:

[0023] Fit the two pole pieces of the micro-magnetic probe closely on the two adjacent crests of the lead screw, so that the electromagnet and the lead screw form a closed magnetic circuit, so that the excitation signal of the excitation coil is coupled between the two crests of the lead screw , forming a stable alternating magnetic field at the bottom of the screw tooth. An arbitrary function generator provides an alternating excitation signal with a gradually increasing amplitude to AC excite the electromagnet. The excitation field passes through the excitation circuit, and the electromagnet is coupled between the two crests of the lead screw. A stable alternating magnetic field with a crescendo in amplitude is formed.

[0024] Under the action of the alternating magnetic field, due to the existence of the Barkhausen effect, the detection coil near the bottom of the screw tooth induces a r...

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Abstract

The invention discloses a micromagnetic nondestructive testing method for the hardness of the bottom of a screw tooth, belonging to the field of nondestructive testing. The two pole pieces of the electromagnet using the micro-magnetic probe are attached to the two adjacent tooth tops of the lead screw to form an excitation circuit. The electromagnet is driven by a sine wave signal with a gradually increasing amplitude and a different frequency to gradually control the tooth bottom. Strong periodic magnetization, the detection coil in contact with the surface of the tooth bottom receives the Barkhausen noise signal during the periodic magnetization. Extract the characteristic parameters (including peak value, half-height width, and root mean square), and obtain the curve of the characteristic parameters changing with the amplitude of the scanning sine wave, and finally use the characteristic parameters of the Barkhausen noise signal at different frequencies and the amplitude of the scanning sine wave and The slope of its change curve characterizes the hardness. During continuous testing, the micro-magnetic probe travels with the rotating screw to complete the hardness testing of the tooth bottom of the entire screw. The method realizes the rapid non-destructive testing of the hardness of the tooth bottom of the ball screw, and overcomes the deficiency that the traditional hardness testing method can only perform the testing of the destructive sampling pattern.

Description

technical field [0001] The invention relates to a detection method for characterizing the hardness of the tooth bottom of a lead screw and the depth of a hardened layer by using characteristic parameters of Barkhausen signals under different excitation intensities and excitation frequencies, and belongs to the field of non-destructive detection. Background technique [0002] As a transmission device with high transmission precision and high transmission efficiency, the screw is widely used in various fields, such as machinery, aerospace, nuclear industry, packaging machinery, etc. The hardness of the ball screw is an important factor affecting the transmission accuracy of the ball screw and the life of the ball screw. One of the main causes of premature ball screw failure is insufficient surface hardness or insufficient case depth. Therefore, the hardness of the ball screw is an important detection index of the screw. At present, the detection methods for the hardness of t...

Claims

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Application Information

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IPC IPC(8): G01N27/80
CPCG01N27/725G01N27/80
Inventor 吴斌邢鹏飞刘秀成何存富
Owner BEIJING UNIV OF TECH
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