Precision stamping parts

Precision stamping parts are high-precision components formed by applying controllable external force to thin metal sheets through plastic deformation or separation, utilizing the synergistic effect of high-precision dies and servo presses. Their dimensional tolerances can be stably controlled within ±0.005–±0.02 mm, and surface roughness reaches Ra0.4–Ra0.8 μm. They possess characteristics of high precision, high consistency, and high cost-effectiveness, making them core components in high-end manufacturing fields such as automotive electronics, medical devices, 3C digital products, and aerospace.

The processing of precision stamping parts primarily utilizes cold stamping processes, with core procedures encompassing precision blanking, multi-station progressive die stamping, micro-bending, deep drawing, and precision shaping. Precision blanking is a key process that distinguishes it from ordinary stamping. By using extremely small die clearances (1%–3% of the material thickness) combined with the pressure of the blank holder and counter-pressure plate, material tearing is suppressed, resulting in a smooth and flat sheared surface on the workpiece, significantly reducing burrs. Multi-station progressive die stamping can complete multiple processes such as blanking, bending, stretching, and shaping in a single stamping operation, avoiding the cumulative dimensional errors caused by multiple clamping operations, and is suitable for large-scale continuous production. For micro-precision parts, micro-forming processes are also used to achieve precise forming of materials thinner than 0.1mm.

Machining precision stamped parts places stringent requirements on materials, dies, and equipment. Materials preferentially selected include cold-rolled steel sheets, stainless steel strips, copper alloy strips, and aluminum alloy strips. Thickness uniformity must be ≤±0.005mm, with a smooth, scratch-free surface and excellent plasticity and ductility. For example, brass strips are often used in electronic connectors, while ultra-thin aluminum alloy strips are suitable for lightweight 3C components. Dies must be made of wear-resistant materials such as cemented carbide or high-speed steel, manufactured using CNC machining centers, wire EDM, and mirror polishing processes. Die precision can reach ±0.002mm, and an online die wear monitoring device is provided. Servo presses are used, with real-time adjustable stamping speed and pressure, and a repeatability accuracy ≤±0.01mm, precisely matching the process requirements of different steps.

Quality control of precision stamped parts is implemented throughout the entire production process. Before production, material flatness and die clearance must be calibrated. During production, online inspection is conducted using 2D image measuring instruments and 3D coordinate measuring machines to monitor dimensional and geometric tolerances in real time. Finished products must be inspected for surface roughness, burr height, hardness, and other indicators to ensure compliance with industry standards. Furthermore, the ambient temperature needs to be controlled within 20℃±2℃ to prevent thermal deformation of the mold from affecting precision.

Its applications cover multiple high-end fields: sensor terminals and precision gearbox springs in automotive electronics; surgical instrument parts and implant components in medical devices; mobile phone camera brackets and battery connectors in 3C digital products; and precision fasteners and micro-sensor housings in aerospace, all relying on precision stamping parts for high-performance assembly.

Currently, the development trend of precision stamping parts is extending towards **micro-nanoization, composite technology, and intelligence**. Micro-nano stamping can achieve micron-level component forming, composite processes integrate stamping with injection molding, welding, and other processes, while intelligent production uses IoT technology to monitor mold status and product quality in real time, driving the upgrade of precision stamping parts towards higher precision and more complex structures.