Method for measuring hardness distribution of fastener

A technology of hardness distribution and fasteners, applied in the direction of testing the hardness of materials, etc., can solve the problems of long measurement time, unsightly hardness distribution curve, inaccurate measurement data, etc., to achieve short measurement time, simple method, and accurate measurement data. high effect

Active Publication Date: 2019-03-22
AEROSPACE PRECISION PROD INC LTD
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Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for measuring the hardness distribution of fasteners to solve the pr

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  • Method for measuring hardness distribution of fastener
  • Method for measuring hardness distribution of fastener
  • Method for measuring hardness distribution of fastener

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[0036] It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified, rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be und...

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Abstract

The invention provides a method for measuring hardness distribution of a fastener. The method comprises the following steps: streaking a sample by a blade with a streaking method; measuring three hardness points sequentially at equal intervals at the beginning end of streaking to serve as standard hardness and correspond to depths of corresponding streak parts, and obtaining the functional relation between Micro Vickers hardness and indentation depth according to data, namely, the indentation depth h obtained with the streaking method and known data including blade sharp corner eta and constant pressure F; enabling the relation to correspond to depth curve of streaks under program control of a controller to obtain the hardness distribution curve of a to-be-measured area. According to the method for measuring hardness distribution of the fastener, streaking is performed on the to-be-measured area, the hardness distribution condition of the measured area is calculated directly accordingto the functional relation between hardness and the indentation depth, and accuracy of measured data is high.

Description

technical field [0001] The invention belongs to the field of hardness measurement, in particular to a method for measuring the hardness distribution of fasteners. Background technique [0002] Hardness is an indicator of the softness and hardness of a material, and at the same time has a certain relationship with the mechanical properties of the material (such as: tension, shear, etc.). Because its measurement method is simpler and faster than the measurement method of tension, shear, etc., hardness is often used in the production process of fasteners to judge whether the product meets the expected mechanical performance requirements. The hardness test is generally a single-point measurement, and the hardness value is calculated according to the size of the indentation. At present, some new products in fasteners have put forward new requirements for the performance of the product, and it is not possible to simply test its tensile force, shear, and single-point (or within-ar...

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Application Information

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IPC IPC(8): G01N3/42
CPCG01N3/42
Inventor 齐跃康彪孙虹烨高伟张文静袁娅张槐刘小鹏梁铠璐
Owner AEROSPACE PRECISION PROD INC LTD
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