Abrasion in-situ measuring device based on digital image processing and method

Abstract

The invention relates to an abrasion in-situ measuring device based on digital image processing and a method. The device comprises a bottom plate, a horizontal displacement device, a vertical displacement device, a semi-arc slot transition plate, a support frame and a digital microscope; the bottom plate is used for supporting the total device in a connected manner and is fixed on a friction abrasion testing machine; the bottom plate is provided with the horizontal displacement device, the vertical displacement device and the semi-arc slot transition plate; the support frame is arranged on the right side of the transition plate and used for supporting the digital microscope; and by the aid of the abrasion in-situ measuring method based on digital image processing, the width value of an abrasion mark is obtained by means of treatments such as graying, binarization and the like for abrasion mark images and calculation of Radon conversion, gradient magnitude and the like. The abrasion mark image of a 'lower test piece' can be acquired accurately and fast, and furthermore, the abrasion image of an 'upper test piece' can be acquired conveniently. Besides, an abrasion mark image processing method is developed to analyze and obtain the width of the abrasion mark, and the in-situ measuring device can precisely measure abrasion marks.

Description

technical field [0001] The invention belongs to the field of in-situ measurement of friction and wear, in particular to a visual wear in-situ measurement device and method based on digital image processing. Background technique [0002] The friction and wear test is the basic method to study the friction and wear properties of materials. By analyzing the change process of wear, the influence of various factors on the friction and wear properties can be revealed. For this reason, the wear analysis during the test is of great significance to the friction and wear test. [0003] Quantitative and qualitative analysis of wear process are two basic analysis methods of wear in friction and wear test. Among them, quantitative analysis methods include: weighing method, surface profile method, indentation method or grooving method, etc. The qualitative analysis method mainly judges the state of wear by analyzing the mechanism of the wear surface image. The off-line analysis method ...

AI Technical Summary

Problems solved by technology

The off-line analysis method represented by the gravimetric method needs to disassemble and assemble the test piece under the test stop condition. Although the quantitative measurement of wear can be realized, the operation is complicated and there are two major defects: first, it cannot be guaranteed every time it is installed. The friction pair remains on the contact track before stopping, which greatly limits the possibility of accurate measurement; second, because the consistency of the contact track cannot be guaranteed, the continuity of the wear process is destroyed, especially for the micro-wear test. big error

However, there are two problems with this method: first, due to the microscopic irregularities of the wear surface, it is difficult to obtain the real wear interface from the fixed-point scanning curve; The characteristics of the worn surface cannot be given, so the change of the wear mechanism cannot be provided

However, since the device has no degree of freedom in the horizontal direction, the horizontal movement of the USB digital microscope needs to be realized by moving the magnetic base, so the positioning accuracy is not high

Moreover, this invention does not form a systematic method for friction and wear image processing when processing wear scar images, so it fails to achieve the desired effect when performing wear surface analysis

In addition, this device can only realize the in-situ measurement of the "lower test piece" (such as the friction disc). If the "upper test piece" (such as the friction ball) is to be measured and analyzed, the "upper test piece" must be disassembled. installation, complex operation

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