Industry knowledge analysis of special brass plates for metal stamping

Special brass plates for metal stamping and the stamping parts made from them refer to metal parts that use copper-zinc alloy as the base material and are formed once or multiple times on a mechanical press through precision stamping dies. Such products play a key structural connection or current conduction role in the electrical, electronic, mechanical and construction fields. Specifically, Electrical Connector Socket Brass Stamping refers to the socket-like brass stamping used inside the electrical connector. Its typical feature is an elastic opening structure used to form reliable contact with the pins. Such parts require materials that can maintain stable contact pressure and have low contact resistance after repeated plugging and unplugging. In addition, Plug Socket Brass Stamping specifically refers to the brass stamped contact piece installed inside the power socket or plug for transmitting current. Its shape design must take into account both smooth plugging and unplugging and sufficient clamping force to avoid arcing or heating. The third key product category is Brass Stamping Switch Terminal Accessories, which are terminal accessories for wall switches, micro switches or relays. These parts usually need to be riveted or welded with silver contacts, so there are clear requirements for the flatness, weldability and tensile strength of the riveted parts of the brass base material. Generally speaking, the dimensional accuracy of brass stamping parts is usually controlled within ±0.05mm, and some products with high requirements can reach ±0.02mm.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The materials used to manufacture the above types of brass stamping parts are usually based on copper-zinc binary alloys, with trace amounts of lead, tin, iron, nickel and other elements added according to specific performance requirements. Common grades include H62 (copper content about 62%), H65 (copper content about 65%) and H70 (copper content about 70%). The higher the copper content, the better the conductivity and ductility of the material, but the strength is relatively reduced; increasing the zinc content increases the strength but reduces the plasticity. For Electrical Contact Assemblies Brass Stamped Parts, the surface condition of the material is particularly critical because the silver alloy contacts need to be fixed to the brass base through resistance welding or mechanical riveting. If there is an oil stain, oxide layer or component segregation on the brass surface, it will directly lead to insufficient welding strength or increased contact resistance. In addition, in application scenarios with high plugging and unplugging times (such as more than 10,000 times) or high sliding wear, lead-containing brass (such as HPb59-1) will be used to improve cutting and wear performance, or tin-containing brass (such as HSn62-1) will be used to improve corrosion resistance. The material supply status mainly includes soft state (M), semi-hard state (1/2H), hard state (H) and extra hard state (EH). The thickness range is usually 0.1 mm to 4.0 mm. Surface treatment methods include electro-tin plating, electro-nickel plating, passivation, wire drawing, etc. Among them, the tin plating layer can significantly improve the welding performance and prevent the oxidation of the copper substrate.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The complete manufacturing process of brass stamping parts usually includes the following ten key steps, each of which has a direct impact on the final quality. The first step: raw material slitting - cut the brass coil with a base material width of 200 mm-400 mm into the specific width required for stamping (such as 12.5 mm, 25.4 mm, etc.) through a slitting machine. The slitting accuracy needs to be controlled within ±0.1mm. Step 2: Continuous die stamping - feed the slit coil material into a high-speed punch (punch times can reach 200-800 times/minute), and complete the processes of guiding, blanking, punching, embossing, bending, and cutting in the progressive die. For Electrical Connector Socket Brass Stamping parts, the bending process requires a specially designed springback compensation angle because brass will rebound at a certain angle after bending (usually the amount of springback is 2°-5°), and the mold needs to reserve a reverse angle in advance to ensure that the opening size of the final product meets the drawing requirements. Step 3: Deburring - use a roller polisher or vibration grinder with a grinding stone and degreaser to remove the tiny burrs produced by the stamped section (the burr height needs to be controlled below 0.05mm).

 

Step 4: Cleaning - Use an ultrasonic cleaning line with environmentally friendly water-based cleaning agents to remove stamping oil and grinding residues. After cleaning, dry and check the surface cleanliness. Step 5: Heat treatment - For parts that require higher elasticity (such as the shrapnel in the switch), stress relief annealing needs to be performed in a protective atmosphere furnace with the temperature controlled at 250°C-350°C for 30-60 minutes to eliminate work hardening and restore a certain degree of plasticity. Step 6: Surface treatment - electro-tin plating, electro-nickel plating, passivation or chemical polishing according to customer requirements. For example, parts used for Plug Socket Brass Stamping usually require a tin plating thickness between 2-8μm to improve soldering performance and prevent patina. Step 7: Secondary processing - For Stamping Riveting Electrical Brass Press Parts, it is necessary to add a riveting process after stamping. The prefabricated silver contacts or wires are fixed on the brass parts through a precision riveting machine. The riveting force needs to be monitored in real time through sensors. The riveting point pullout force is generally required to be no less than 30N. Step 8: Inspection - Use automatic optical inspection (AOI) equipment to conduct a full inspection of size and appearance defects. At the same time, samples are taken for contact resistance testing (required ≤5mΩ) and salt spray testing (for example, neutral salt spray without rust for 24 hours). Step 9: Packaging. According to customer requirements, use carrier tape packaging, anti-static plastic bag packaging or carton bulk packaging. It is necessary to ensure that the parts do not collide with each other and cause deformation during transportation. Step 10: Shipment - Provide material certificate, dimensional inspection report and performance test report with the goods.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The application industries of brass stamping parts are very wide, covering almost all fields that require electrically conductive, thermally conductive or wear-resistant metal parts. In the electronic and electrical industry, Electrical Metal Brass Stamping Parts are widely used in the manufacture of conductive bridges, grounding terminal blocks, relay moving reeds and various types of terminal blocks inside circuit breakers. These components are directly related to the safety and service life of electrical equipment. In the field of construction and home furnishing, brass stamping parts are not only used for functional components such as door lock bolts, hinge bearings, and window stay sliders but also widely appear in highly decorative occasions, such as switch panel frames in high-end hotels, internal reinforcements for bathroom pendants, etc.

 

The automotive manufacturing industry is another important area of ​​application, with brass stampings used for lamp socket terminals, conductive strips in fuse boxes, sensor housing grounding lugs and signal terminals in electric vehicle charging interfaces. It is worth mentioning that Electric Brass Stamping Part for Wall Switch Socket is the core conductive part in wall switch sockets, and its demand continues to grow with the popularity of smart homes. Such parts usually need to have both high current-carrying capacity (10A-16A) and long-term creep resistance. In addition, brass stamping parts are also widely used as signal or power transmission media in communication base stations, server power supplies, smart meters and industrial automation control cabinets.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

We provide a one-stop service for Brass Custom Stamping Parts from material selection, mold design, continuous stamping, various surface treatments (tin plating/nickel plating/passivation) to riveting assembly, and strictly follow the quality management system. New and old customers are welcome to provide drawings, samples or technical requirements. Our company will complete the process evaluation and provide competitive quotations and proofing cycles.