How many holes are there on automotive stampings?

Automobile stamping parts are widely used metal processing products, which are obtained by punching the required holes and profiles on the material. The shape and size of the holes and profiles are required to be consistent with the drawings, and the deviation is within the size specified by the manufacturing industry. Within the tolerance, the surface must be well free of obvious defects such as burrs, bevels and scratches. Holes are very critical in the processing of stamping parts and can be divided into three types: mounting holes, positioning holes and process holes. 1. Mounting holes refer to the holes needed to install the car chassis, interior trim and accessories on the body. It is matched with the standard parts installed. The size and shape are determined by the standard parts according to the purpose; generally there are three holes: square holes, round holes and long holes. There are two types, square holes are matched with square standard parts, and the holes with a standard round surface shape are round holes. The position of this kind of hole is required to be very accurate. There is no adjustment margin when installing accessories, so the more used are Long hole, due to the needs of the body and the stamping process, the shape of the long hole is designed to be composed of a square and two semicircles, which will ensure a certain adjustment margin when installing accessories, so that the accessories can be installed accurately and conveniently. On the car body; 2. The positioning hole refers to the hole used for car body welding to locate automobile stamping parts. Because the position of the car body welding is required to be very accurate, the positioning hole is usually a round hole in most cases, and there are very few positioning holes because of special needs It is designed to be square, and the size and position of this hole are required to be very accurate when punching; 3. The process holes include the gaps intentionally left when installing accessories, the holes for draining swimming fluid during electrophoresis, and the design and reduction of punching. The gap designed for the weight of the part, the gap that has to be designed for formability, etc., the process holes have different shapes and sizes, and there is no very high requirement for the position. The process holes are generally determined by the purpose, shape design and stamping process; special requirements are required It is explained that in the design of metal stamping parts, the three kinds of holes are not independent of each other. For example, positioning holes can also function as process holes, and process holes can also be used as positioning holes. In special cases of mounting holes It can be used as a craft hole, but generally cannot be used as a positioning hole. The hardware stamping parts factory should flexibly grasp the difference between these three kinds of holes according to the actual situation. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automotive stamping parts molds Learn more: Points to note in the design of continuous stamping dies