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对目前国内普遍使用的真比冲击试样V型缺口公差带放大图的角度公差带宽度进行了分析和计算，结果发现，这些的公差带放大留给出的实际角度公差并不符合国家标准GB／T229－1884金属夏比冲击试验方法的规定要求。为此，提出了改进绘制的方法。
At present, the angle tolerance band width of V-notch tolerance band which is widely used in China is widely analyzed and calculated. The results show that the tolerance of the actual angle given by these tolerance band enlargement does not conform to the national standard GB / T229-1884 metal Charpy impact test methods and requirements. To this end, proposed to improve the drawing method.