Stamped parts

Stamping is the process of applying external force to metal or non-metal sheets using a press and specialized dies, causing plastic deformation or separation to obtain workpieces with specific shapes, sizes, and properties. It is a fundamental component in the machinery manufacturing field, characterized by high precision, high efficiency, and low cost, and is widely used in the production of products in industries such as automobiles, electronics, home appliances, and aerospace.

The processing of stamping parts primarily utilizes cold stamping, which involves processing sheet metal at room temperature without additional heating, thus preserving the material's mechanical properties to a greater extent. The core processes can be divided into four categories: first, blanking, which separates sheet metal using the cutting edge of a die, used to manufacture flat parts such as gaskets and housings; second, bending, which bends sheet metal into specific angles or curved surfaces, such as structural components like brackets and hinges; third, stretching, which forms flat sheet metal into open hollow parts, such as automotive fuel tanks and rice cooker inner pots; and fourth, forming, which uses processes such as bulging and flanging to manufacture complex irregular-shaped parts to meet special assembly requirements. For materials with significant thickness and high strength, such as high-strength steel plates, hot stamping is employed. Heating enhances the material's plasticity, reduces stamping resistance, and ensures the quality of the formed workpiece.

The processing quality of stamped parts is closely related to the materials, molds, and equipment. Commonly used raw materials include low-carbon steel, stainless steel, aluminum alloys, and copper alloys. These materials possess good plasticity and ductility, meeting the requirements of stamping deformation. Molds must be made of wear-resistant hard alloys or high-speed steel and precision-machined to ensure dimensional accuracy. The mold clearance directly affects the cross-sectional quality and dimensional tolerances of the stamped parts. Equipment primarily consists of CNC punch presses and hydraulic presses, with high-speed punch presses capable of hundreds of stamping operations per minute, suitable for mass production.

The applications of stamped parts cover multiple fields: automotive body panels, chassis brackets, and door hinges; electronics and electrical appliances connector terminals, mobile phone casings, and heat sinks; home appliances such as refrigerator panels, washing machine drums, and air conditioner brackets; and aerospace precision instrument brackets and aircraft structural components, all of which use stamped parts as core components.

Quality control during the manufacturing process is crucial. Common defects include excessive burrs, workpiece deformation, cracks, and dimensional deviations. Defects must be prevented by optimizing die clearances, adjusting stamping pressure and speed, and strengthening raw material inspection. Simultaneously, equipment such as 2D image measuring instruments and hardness testers are used for finished product inspection to ensure that stamped parts meet design standards. As the manufacturing industry moves towards lightweighting and precision, stamping is upgrading towards multi-station progressive die stamping and composite forming processes, further improving production efficiency and product accuracy.