Measure the hole diameter of stamping parts

The hole measurement of stamping parts takes the minimum value according to the measurement method of the stop gauge, so when you use the caliper to record, you can generally record the minimum value (exclude too small values, such as errors caused by measurement errors), (do not rule out There are special cases) Recording the maximum value and the average value has no practical meaning. The difference in the size of the aperture measured in all directions should be recorded in the roundness of the geometric tolerance, not the aperture. In addition, if it is surveying and there is no size to refer to, you should decide based on its cross-section. You can’t just take the average value. For example, the minimum value you measured may be caused by the wear of a certain part of the punch. If the brightness band of the section is extremely small, then this minimum value is meaningless. Generally speaking, the wear of the punch leads to the reduction of the punching hole (specific analysis is required for special-shaped holes), so the maximum value can be used when surveying and mapping. Don't forget the quality of the section, because the basic size of the hole diameter is taken when the punch is manufactured. The maximum value within the allowable deviation is multiplied by 0.5~0.75 to keep the wear amount. After a period of use, the punching becomes smaller, but as long as the section quality is still acceptable, the value is still within the tolerance range. correct. Related news: The characteristics of the main materials of stamping parts, the treatment of common problems of stamping parts, the characteristics of scaffolding stamping parts and the importance of inspections