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我厂生产汽车轴瓦用的20高锡铝基钢带为外购件,故钢带进厂需检验钢背和合金层的硬度。钢层厚约1.9～2.7mm;合金层厚约1mm。沪Q/YB729-84标准要求,合金层:HB·2.5/15.6/60=22～32;钢背:HB·2.5/62.5/10=170～240。我厂无小负荷硬度计(特别是15.6公斤)。我们试图在现有的HR150型洛氏硬度计上测定之途径,按照布氏硬度法测定原理,经试验,与计量部门用的HP250型硬度计测定值比较,二者的硬度值接近。测定依据与测定对比如下: 1 测定依据 (1)HR 150型硬度计与布氏硬度计均属杠杆静力试验。本试验是将布氏硬度计用的钢球压头,配装
I plant the production of automotive bearings with 20 high-tin aluminum strip purchased parts, so the strip into the plant to be tested steel back and alloy layer hardness. Steel thickness of about 1.9 ~ 2.7mm; alloy layer thickness of about 1mm. Shanghai Q / YB729-84 standard requirements, the alloy layer: HB · 2.5 / 15.6 / 60 = 22 ~ 32; steel back: HB · 2.5 / 62.5 / 10 = 170 ~ 240. I plant no load hardness tester (especially 15.6 kg). We tried to determine the way on the existing HR150 Rockwell hardness tester, according to the principle of Brinell hardness test, the test, and the measurement department with the HP250 type hardness tester measured value, the hardness value of the two close. Measurement basis and determination of contrast as follows: 1 Determination of (1) HR 150-type and Brinell hardness tester are both static test. This test is to use Brinell hardness ball head, with