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GB229-84《金属夏比(U型缺口)冲击试验法》明确规定,以10mm×10mm×55mm带有2mm深的U型缺口试样为标准试样,试样的缺口尺寸R=1±0.07mm。为了快速测量缺口R的尺寸,选用一根普通自行车辐条,中间部分不可挠曲,为了握持方便,将辐条两侧弯成“O”形,中间剪断,用小组锉和金相砂纸(铺垫玻璃)轻轻磨平断口,这样就做成了两支。如图1所示。 使用时,对正试样缺口,肉眼观测(用10倍放大镜观测更为理想)是否有间隙。如图2所示。因为辐条的公差尺寸是R1±0.01mm,由于试样缺口的尺寸是R1±0.07mm,所以,辐条放入缺口时,肉眼观测,基本无间隙。这样用辐条测量缺口R的尺寸,就可以满足GB229—84之规定,(在试样其它尺寸合格的情况下)能
GB229-84 “metal Charpy (U-notch) impact test” clearly stipulates that the 10mm × 10mm × 55mm with 2mm deep U-notch sample as a standard sample, the sample notch size R = 1 ± 0.07 mm. In order to quickly measure the size of the notches R, an ordinary bicycle spokes are selected, the middle part is not flexible, in order to hold conveniently, the spokes are bent into “O” shape on both sides, cut in the middle, with a group file and metallographic sandpaper Gently smooth the fracture, so made into two. As shown in Figure 1. Use, the positive sample gap, the naked eye observation (with 10 magnifying glass observation is more ideal) for the gap. as shown in picture 2. Because the spokes have a tolerance of R1 ± 0.01 mm, the size of the notch is R1 ± 0.07 mm. Therefore, when the spokes are put into the notches, the naked eye is observed without any gap. This use of spokes to measure the size of the gap R, GB229-84 to meet the provisions of (in the case of other qualified size) can