Brinell hardness circular groove indentation diameter measuring device

Abstract

The invention provides a Brinell hardness circular groove indentation diameter measuring device, and relates to the technical field of metal hardness measuring instruments. The Brinell hardness circular groove indentation diameter measuring device comprises a frame body, and is characterized in that a guide rail groove is inwards formed in the inner wall of the frame body; the interior of the guide rail groove is slidably connected with a connecting rod through a roller, the connecting rod is slidably connected with a positioning device, the upper portion of the positioning device is sleeved with an observation and measurement device, the two sides of the frame body are fixedly connected with fixing devices, a metal sample plate is fixedly placed between the fixing devices, and an indentation groove is formed in the metal sample plate in an extruded mode. According to the invention, the measuring device can still measure the diameter of the indentation in a complex environment, the practicability is improved, the precision during measurement is improved, the indentation circular groove can be singly positioned and aligned before measurement, missing measurement or excessive measurement of the indentation circular groove is avoided, and the authenticity of multiple groups of data is improved.

Description

technical field [0001] The invention relates to the technical field of metal hardness measuring instruments, in particular to a Brinell hardness circular groove indentation diameter measuring device. Background technique [0002] The principle of Brinell hardness measurement is to use a certain test force to press a quenched steel ball or a hard alloy ball with a diameter of D into the surface of the metal to be tested, keep the test force for a specified time, and use a reading microscope to measure the pressure. The average diameter of the indentation is d, and then the Brinell hardness HB value is obtained according to the formula. Because the indentation left on the surface of the metal material is relatively large, the measured hardness value is relatively accurate, and is widely used in cast iron, non-ferrous alloys and various In the hardness measurement of annealed and quenched and tempered steel. [0003] However, since the Brinell hardness value is calculated by t...

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Problems solved by technology

[0003] However, since the Brinell hardness value is calculated by the indentation diameter, the accuracy of the indentation diameter measurement is an important factor affecting the accuracy of the Brinell hardness measurement, but the traditional indentation diameter measurement method is to place the metal sample block on the platform Then place the reading microscope on the top of the indentation circular groove for measurement. During the measurement process, the metal sample block and the reading microscope are easily moved by external forces, which increases the error in the measurement. When measuring the diameter of the indentation Usually, the method of taking the average value of multiple sets of measurements is adopted, so there will be multiple indentation circular grooves on the metal sample block, and the traditional reading microscope is prone to measurement errors for indentations when zooming in and observing, so that the indentation circular grooves are missed. Measurement or multi-measurement reduces the authenticity of multiple sets of data and increases the error generated in the calculation process

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