Metal stamping parts are widely used in various fields of our life, including some electronic devices, auto parts, decorative materials, etc. We usually say stamping parts generally refer to cold stamping parts.
The measurement method of hardware automobile stamping parts: the hole measurement of metal stamping parts is based on the measurement method of the pass and stop gauge, and the small value is generally recorded when the caliper is used to measure the record (to exclude too small value, such as measurement error The resulting error), (does not rule out special circumstances) recording the maximum value and the average value has no practical significance, for the size difference of the measurement of the aperture in all directions, it should be recorded in the circularity of the shape and position tolerance, not the aperture.
In addition, if it is surveying and mapping, and there is no size for reference, it should be determined according to the condition of the section, and the average value cannot be taken alone. For example, the small value measured may be caused by the wear of the punch somewhere. The bright band is extremely small, so this small value is meaningless.
Generally speaking, the wear of the punch leads to the reduction of the punching hole (the special-shaped hole needs to be analyzed in detail), so the larger value can be taken during the surveying and mapping, and the quality of the section should not be forgotten, 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 leave the wear amount. After a period of use, the punching becomes smaller, but as long as the quality of the section is acceptable, the value is still within the tolerance range. At this time, the larger value is Correct (similarly, factors such as deformation of the plate thickness in the direction of the plate thickness, such as hole warping, etc., should be excluded, especially for thin plates).
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