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在测定硬度时,常常遇到一些构件不能作直接的测定,而这些部位往往是机件失效多发区域,亦是冷、热加工工艺过程中极易产生疵病的区域,如轴类件台阶的根部处,在中频、高频淬火或喷丸强化时,经常产生硬化层区域超限或强化不足。这类工艺缺陷若不能被测定出将潜伏着某种隐患。缩小测定硬度障碍区,这对无损测定硬度和及时反映加工工艺过程中的质量均有帮助。兹将对硬度计的压头(HB～3000型)和测定件工作台以及DM型测量显微镜改装介绍如下: 1 HB-3000型外径为(?)27mm的压头,在测定硬度压痕时,离测定件边缘处>13.5mm。在确保压头的承受抗压强度前提下,设计的压头宽度为9.5mm,
In the determination of hardness, often encountered some components can not be directly measured, and these parts are often the area of mechanical failure, but also cold and hot process can easily lead to defects in the region, such as the shaft of the step Root Department, in the IF, high-frequency quenching or shot peening, the hardened layer often produce overrun or insufficient reinforcement. If such defects can not be determined to be lurking a hidden danger. Reduce the determination of the hardness of the obstacle area, which non-destructive determination of hardness and timely reflection of the quality of the processing process are helpful. Here are the hardness of the head (HB ~ 3000) and the determination of the workbench and DM-type measuring microscope modifications are as follows: 1 HB-3000-type outer diameter (?) 27mm of the pressure head, indentation in the determination of hardness , From the edge of the measurement> 13.5mm. Under the premise of ensuring the compressive strength of the indenter, the designed indenter width is 9.5mm,