Measurement method of small hardness sample and clamping fixture

Abstract

The invention discloses a measurement method of small hardness sample and clamping fixture. The method comprises: first placing a clamping fixture full with positioning and mounting holes on a backing plate, clamping the hardness samples separately in the positioning and mounting holes, fixing every hardness sample on the clamping fixture on basis of the upper surface of the backing plate, clamping and fixing the clamping fixture on a polish-grinding machine and polishing and grinding the end surface to be measured of the hardness sample, placing the clamping fixture on the table of the hardness test machine, and then measuring one by one the end surface of the hardness sample to be measured on the clamping fixture and recording results. In the invention, the hardness samples are made and measured together, while the original method for hardness measurement is only in a single measurement style, measurement efficiency is largely promoted, work intensity of the personnel is lowered, and defects of slow speed, trivial steps and low efficiency for the measurement and preparation of hardness samples in the prior art is solved.

Description

technical field [0001] The invention relates to a method for measuring a small hardness sample and a clamping tool, belonging to the technical field of hardness measurement. Background technique [0002] Since most of the fastener products produced in my country are relatively small, such as bolts, screws, studs, studs, pins and rivets with specifications less than 8, hardness testing is required to be commissioned in the heat treatment and general inspection processes, and some of them are also Full inspection is required, but the original hardness testing method can only be polished, polished, cleaned, dried, and tested one by one, which makes the sample preparation and measurement process extremely slow, and the steps are cumbersome and time-consuming , low efficiency, etc. At the same time, due to the small size of the sample, it is difficult to ensure the parallelism and surface finish of the two parallel end faces during the sample preparation process, so that the measur...

AI Technical Summary

Problems solved by technology

[0002] Since most of the fastener products produced in my country are relatively small, such as bolts, screws, studs, studs, pins and rivets with specifications less than 8, hardness testing is required in the heat treatment and general inspection processes, and some of them are also Full inspection is required, but the original hardness testing method can only be polished, polished, cleaned, dried, and tested one by one, which makes the sample preparation and measurement process extremely slow, and the steps are cumbersome and time-consuming , low efficiency, etc. At the same time, due to the small size of the sample, it is difficult to ensure the parallelism and surface finish of the two parallel end faces during the sample preparation process, making it impossible to accurately locate during the measurement, and the measured data is inaccurate

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