Precision stamping parts for vacuum base

Precision stamped vacuum bases are core components in vacuum systems, used for positioning, support, and sealing. They are commonly found in precision devices such as semiconductor equipment, vacuum coating machines, and vacuum testing instruments. Their precision and performance directly affect the sealing performance, stability, and measurement accuracy of the vacuum system. The following section introduces them from four aspects: core characteristics, manufacturing process, material selection, and application scenarios.

Core Characteristics

Precision stamped vacuum bases must meet stringent vacuum sealing requirements, typically achieving an ultra-high vacuum environment sealing standard of 10⁻⁹ Torr to prevent gas leakage. They also possess high-precision positioning capabilities, with dimensional tolerances controlled within ±0.01mm and a surface roughness Ra≤0.4μm to ensure precise docking with other vacuum components. Furthermore, they must possess good mechanical strength and corrosion resistance to withstand repeated assembly and disassembly and long-term operation in vacuum environments.

Manufacturing Process

Manufacturing is based on precision stamping technology, combined with fine stamping and composite stamping processes. Through the entire process of clamping by the pressure plate and ejector plate in the die, the material is plastically sheared, avoiding the tearing defects of ordinary stamping. Dimensional accuracy can reach IT6-IT8 level. The dies are mostly made of high-hardness, wear-resistant materials such as Cr12MoV, which are enhanced in hardness and wear resistance through vacuum heat treatment. After stamping, CNC precision machining, deburring, and surface coating are often performed to further improve precision and sealing performance. Key process parameters such as stamping speed and pressure must be precisely controlled to prevent defects such as springback and warping.

Material Selection

The mainstream materials are 304 and 316L stainless steel, which combine corrosion resistance and high strength, suitable for harsh vacuum environments. For some lightweight applications, aluminum alloys such as 6061 are used, with surface anodizing to improve wear resistance and sealing performance. Materials must meet environmental standards such as RoHS, and material impurities and porosity must be controlled to avoid affecting the vacuum sealing effect.

Application Scenarios

Widely used for vacuum gauge installation, vacuum valve fixing, and support of semiconductor wafer transport devices. In high vacuum measurement, the precise positioning of the base ensures the measurement accuracy of the vacuum gauge; in semiconductor manufacturing, its stable support ensures the consistency of wafer processing and is an important guarantee for the efficient operation of the vacuum system.