Three composite rivet rivet type electric contact belongs to monomer type electric contact replacement products, the original monomer sterling silver or silver alloy rivet type electric contact structure, restructuring of the head and nail with sterling silver or silver alloy materials, using pure copper materials among the three layers of composite structure of the rivet type electrical contacts (three compound contact contact with monomer contrast diagram as shown in figure 1, figure 2). The purpose is to save the use of the precious metal silver, thus reducing the production cost of contact. Compared with the single contact, every grain of three composite touch consumption by more than 40%.
Three composite rivets is the technical difficulties, nail silver layer and composite strength of copper base material, the traditional composite cold forging machine could not be achieved, the reason is that the composite cold forging machine is cold welding forming technique, namely the cold welding is under the action of pressure, make the metal plastic deformation, and a method to implement solid-state welding, the premise that the compound must have the plastic deformation characteristics, in general, the composite cross section deformation rate should be greater than 60%, can guarantee the composite strength. And three composite type rivet contact due to the limited by the structure, processing plastic nail of material deformation to meet the requirements, so the bonding strength problem is very outstanding, serious when can appear even after layer falls off phenomenon.
At present, the special three-composite cold forging machine imported from Germany can realize the processing and production of three-composite rivet type contacts. However, after the nail part is cooled and reassembled, it adopts the dimension work relying on the silver knife, which results in the scraping down of 20%~40% of the contact materials. Therefore, the material utilization rate is low, the recovery cost is high, and the imported equipment is very expensive.
Three composite rivet type electric contact my company's production USES the vacuum diffusion welding technology, its principle is: will the welding workpieces placed under vacuum to protect the environment, through the heating system of heating, in certain conditions, such as temperature, time, atmosphere, make the contact surface between the mutual diffusion of atoms, so as to achieve metallic bond together to form a kind of welding process on the surface of the weld.Compared with cold press welding, its welding surface bonding strength is better, contact resistance is small and stable.
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