HT-1000A/2000A 里氏硬度仪

仪器特点:

  • 体积小
  • 重量轻
  • 操作简便
  • 测试精度高
  • 适合多种金属材料的测试,不受空间和方向的限制,机外软件校正功能,通过功能键用户自己就能轻易掌握
  • 液晶屏直接显示测试结果,根据设定程序可以直接显示 HL 硬度值和 HV, HB, HRB, HRC,HSD换算硬度值

操作方法:
HT-1000A/HT-2000A 操作简便,如下图所示:

1. 设定程序 用户根据自己需要,选择被测材料,硬度标尺,测试方向和平均值次数。

2. 加载 左手握住仪器前端,右手握住仪器导管沿纵向移动到底端(如图2),然后反向回位(右手不要松开)

3. 测试 将仪器置于被测工件表面,右手轻按仪器末端的释放按钮

4. 读数 仪器液晶屏显示测试结果

图 1. 设定程序
图 2. 加载
图 3. 测试
图 4. 显示数值
 

使用条件:

HT-1000A和HT-2000A里氏硬度计是采用动态测试原理来确定硬度的,它对被测工件的要求有别于静态测试法(如台式硬度计),满足以下要求即可选用本仪器:

1.被测工件的重量应≥3kg且被测点的厚度≥20mm;
2.被测工件表面曲率半径一般应R≥30mm,若R=10~30mm应选购异型支承环;
3.被测部位的粗糙度应满足Ra≤2μm; 4.被测工件≤3kg或厚度在3~30mm的形状规 则密室工件要耦合在工作平台上;
5.表面硬化处理的工件,其硬化层厚度应≥0.8mm.


 

测试原理

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.


Leeb hardness value (HL) is determined using the following formula:
              HL = (Vb/Va) x 1000

Where Vb is the rebound velocity of impact body and Va is the impact velocity of impact body.
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