《理化检验·物理分册》1992年第1期刊登了夏比(V型缺口)冲击试样缺口顶角至背面长度的测量(以下简称《夏比》一文,笔者准备按该文方法加工一块规,但经仔细分析《夏比》一文有以下不妥处,现提出与大家共同商榷。 1 《夏比》中提出的测量注意事项,在实际工作中是较难满足要求的。由于试样V型缺口的顶角要求为45°±2°,试样的顶角为43°±15°,这样实际加工的试样V型缺口的顶角必然大于块规的顶角,这样块规顶角装入试样V型缺口后就不可能靠拢、靠紧,也难保证测量时块规底面至顶角的轴线与试样V型缺口顶角至试样背面棱线的垂直线重合。 为了达到《夏比》中测量注意事项的要求,应当设计一组块规,即43°、45°、47°,使用中根据试样V型缺口的角度来选择相应角度的块规。 2 试样V型缺口顶角结构应为R0.25±0.025mm,因此块规的顶角结构不能是尖角,也应加工成R0.25mm左右的圆角。 3 根据GB2106-80《金属夏比(V型缺口)冲击试验方法》要求,检查试验尺寸用的量具精度不应低于 “Physical and Chemical Testing and Physics Volume” 1992 the first issue of the Charpy (V notch) impact specimen notch vertex to back length measurement (hereinafter referred to as “Charpy” one article, I prepared according to the method of processing a piece of regulation However, after careful analysis of the following article, “Xiabye” has the following problems, and it is proposed that we discuss it with everyone. “1 The precautions for measurement proposed in” Charpy “are difficult to meet the requirements in actual work. The apex angle of the notch is 45 ° ± 2 ° and the apex angle of the specimen is 43 ° ± 15 ° so that the apex angle of the V-notch of the actually processed specimen must be greater than the apex angle of the gauge, It is impossible to move closer to the sample V-notch and to ensure the coincidence of the axis of the bottom of the block to the apex and the vertical line of the sample V- ”Charpy“ in the measurement considerations, should design a set of block rules, that is, 43 °, 45 °, 47 °, the use of the sample according to the V-notch angle to select the appropriate angle block gauge. Type notch corner structure should be R0.25 ± 0.025mm, so the top corner of the block structure can not be sharp, but also should be added The work into R0.25mm around the fillet .3 According to GB2106-80 ”Metal Charpy (V notch) impact test method" requirement, check the size of the test precision with a measuring tool should not be less than