The purpose is to economize the use of precious metal silver, thus reducing the production cost of contact.Compared with single contact, the silver consumption can be reduced by more than 40%.Three research and development of composite type rivet contact is the technical difficulties, nail of silver and copper base material layer of composite strength traditional composite cold pay machine is especially law implementation, the reason is that the composite LengHui machine adopts cold welding forming technology, namely the cold welding is under the action of pressure, make 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.Due to the limitation of the structure, the processing plastic deformation of the nail material is difficult to meet the requirements, so the bonding strength problem is very prominent, and in serious cases, the cladding layer may even fall off.
Diffusion welding equipment is a key equipment in the production of three composite contact, in order to ensure the welding quality, the equipment must be equipped with a monitoring system of temperature, time, vacuum degree, also require heating speed, temperature uniformity in the heating area, convenient operation and convenient for observation. After repeated experiments, the heating mode was finally determined by high frequency induction heating, the main technical parameters of vacuum diffusion welding equipment, power oscillation for 30 kw, the highest heating temperature 1200 ℃, 1000 3 ℃ furnace temperature uniformity, induction heating coil adopts the cooling water circulation cooling, vacuum 1.33 x 10-3 pa, a timer 0 to 10 min.
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