美國GR公司HT-2000A袖珍硬度計

HT-1000A和HT-2000A里氏硬度計是采用動態測試原理來確定硬度的，它對被測工件的要求有別于靜態測試法(如臺式硬度計)，滿足以下要求即可選用本儀器：

1.被測工件的重量應≥3kg且被測點的厚度≥20mm；
2.被測工件表面曲率半徑一般應R≥30mm，若R=10~30mm應選購異型支承環；
3.被測部位的粗糙度應滿足Ra≤2μm; 4.被測工件≤3kg或厚度在3~30mm的形狀規 則密室工件要耦合在工作平臺上；
5.表面硬化處理的工件，其硬化層厚度應≥0.8mm.


 

The HT-1000A and HT-2000A hardness testers operate on the Leeb principle, a dynamic hardness test method based on velocity measurement. They include a guide tube and an impact body. The impact body contains a magnet and tungsten-carbide ball, measurements are performed using a spring to propel an impact body through a guide tube towards the test surface. When the ball is within 1 mm of the part’s surface, the magnet induces a voltage into a coil surrounding the guide tube. After penetration, the impact body rebounds and the magnet returns through the coil inducing a second voltage. Both voltages are proportional to the velocity of the impact body.