Characteristics and measurement methods of metal stamping parts

Stamping parts are mainly formed by stamping metal or non-metal sheet materials with the pressure of a press through a stamping die. It mainly has the following characteristics: (1) Stamping parts are manufactured by stamping under the premise of low material consumption. The parts come out with light weight and good rigidity, and after the sheet material is deformed by injection molding, the internal structure of the metal is improved, so that the strength of the stamping parts is increased. (2) The stamping parts have high dimensional accuracy, the same size as the mold parts, and good interchangeability. No further machining is required to meet general assembly and use requirements. (3) During the stamping process, because the surface of the material is not damaged, the stamping parts have a good surface quality and a smooth and beautiful appearance, which provides convenient conditions for surface painting, electroplating, phosphating and other surface treatments. Punching parts measurement method The hole measurement of metal stamping parts is the minimum value according to the measurement method of the stop gauge, so you can generally record the minimum value when you use the caliper to measure and record (exclude too small values, such as errors caused by measurement errors) ), (not ruled out special cases) recording the maximum value and the average value has no practical meaning. For the difference in the size of the aperture measured in all directions, it 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. The bright band of the section is extremely small, so the minimum value is meaningless. Generally speaking, the wear of the punch leads to the reduction of the punching (specific analysis of special-shaped holes), so you can take the maximum value when surveying, and don’t forget the quality of the section. , Because when the punch is manufactured, the basic size of the hole diameter + the maximum value within the allowable deviation is multiplied by 0.5-0.75 to retain the amount of wear. After a period of use, the punching becomes smaller, but as long as the section quality is still acceptable, Then its value is still within the tolerance range. At this time, the maximum value is correct. (Similarly, the deformation in the thickness direction of the plate should be excluded, such as hole uplift, especially for thin plates). Related news: The characteristics of the main materials of stamping parts, the handling of common problems of stamping parts, the characteristics of scaffolding stamping parts and the importance of inspections