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我厂生产铜铅合金轴瓦,需作HB30左右的硬度测定。但产品在制成试样后合金层厚度仅有2～3毫米。要正确测定这种试样的硬度应具有62.5公斤负荷级数的布氏硬度计。而我厂布氏硬度计的最低负荷为187.5公斤,根本不能准确地测定轴瓦的硬度。如果另铸试样,又和产品的生产条件不完全一致,仍不能真实反映产品的硬度。为保证产品质量必须随时对产品硬度作准确的测定。我们在对硬度试验的基本原理研究之后,大胆地在洛氏硬度计上装上φ4.7625的
I plant production of copper-lead alloy bearings, HB30 for about hardness measurements. However, the thickness of the alloy layer of the product after the sample is made is only 2 to 3 mm. Correct determination of the hardness of such a sample shall have a Brinell hardness of 62.5 kg load series. The minimum load of Brinell hardness tester in our factory is 187.5 kg, which can not accurately measure the hardness of bearing bush. If you cast another sample, and the production conditions and products are not exactly the same, still can not truly reflect the hardness of the product. In order to ensure product quality, the hardness of the product must be accurately measured. After we studied the basic principles of hardness testing, boldly installed on the Rockwell hardness tester φ4.7625