金属材料夏比冲击试样V型缺口测量不规范导致冲击试验测试值严重失准, 比例图形绘制的精度及正确画法是保证冲击试样尺寸和形状完全满足GB/T229-2007规定的重要手段, 因此要严格控制夏比冲击试样V型缺口的测量精度, 用于缺口投影仪检验缺口质量和加工精度的标准公差带图形的绘制要统一标准。

Non-standard measurement of Charpy V-notch impact specimens of metallic material led to test value discrepancy seriously, and the precision of proportion graphics and the corret drawing were important means to guarantee the size and shape of impact specimens fully meet with the requirement of GB/T229-2007. So the measurement accuracy of Chapy V-notch impact specimens should be strictly controlled, the standards for inspecting notch quality with gap projector and drawing of standard figure of processing precision should be unified.