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
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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 |
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图 1. 设定程序 |
图 2. 加载 |
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图 3. 测试 |
图 4. 显示数值 |
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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.
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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.
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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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