Technology of solder of cupreous hard drill steel (CuproBraze) it is the solder of a kind of drill rod that association of international copper trade is automobile industry and heavy industry technically to production makes heat exchanger and be developed engineering technology, by Swedish Otto copper of elder brother general takes company promotion to carry out. The join mechanism with technology of traditional stannum solder is same, technology of drill rod solder also is to make stuff stuff and material of the mother's body produce reaction, the form that changes with alloy in place of face of have a common boundary forms metallic link. Their differentia depends on, the melting point of the metallic filling that place of technology of drill rod solder uses is higher than stannic solder. Accordingly, the copper alloy that passes special research and development makes the optimal choice of technology of new-style needle solder. The fused temperature of this kind of alloy is 600 ℃ , fused temperature limits is 10 ℃ , had offspringed by Otto general company filed patent, but can use freely at car and industry of heavy industry heat exchanger. Before long, car tail gas and pollution of condition of big compression ring had delimited went up equal-sign, and the object that the azotic oxygen compound that comes from car engine discharged nature to become orgnaization of each country environmental protection and constituent attention, the management department of Europe, United States and Japan is harmful of gas discharge enacted severe limitative measure. According to the standard of European Ⅳ size that will implement 2005, to derv engine, the discharge capacity of oxygen compound will compare its nitrogen to reduce 30 ％ at present; And the requirement according to bureau of American environmental protection, the discharge capacity of azotic oxygen compound will compare derv engine to reduce 95 ％ at present 2007. Face future to discharge a standard slashingly, numerous car manufacturer must improve existing technology and design method hard. The most efficient way uses waste gas recycle namely (EGR) technology. This kind of technology can guide partial waste gas the person arrives the mouth taking energy of life of engine, the mixture that adopts waste gas and fresh air will reduce the oxygen tolerance that enters engine interior. Of oxygen tolerance decrease can make react temperature drops, react the quantity reduces the azotic oxygen compound of generation considerably consequently. However, EGR technology can make in the application on engine system of whole car refrigeration produces change, to heat exchanger high temperature resistant function, medicinal powder the demand of hot property and intensity also rises considerably subsequently, and the aluminium that uses generally at present makes heat exchanger satisfy these requirements very hard again. Car refrigeration system becomes the bottleneck that technology of auto industry environmental protection develops gradually, the heat exchanger of brass of red copper ／ that applies production of technology of solder of cupreous good shot to make had the stage that exhibits skill greatly right now. A of technology of solder of cupreous good shot distinct advantage is it allows to use thinner carbon fin and radiating tube data, the copper that this makes use high strenth, anti-corrosive, high reliability and tall thermal conductivity and copper alloy become a possibility. Used this kind of craft and the Tu Fu that match to it the cupreous belt that needle solder creams and copper pipe, the heat exchanger with a light, efficiency is tall, solid and cabinet weight can be made below low cost. As a result of the dispense with in craft those who harm an environment go oily working procedure, and in producing a course, need not clean, won't generate liquid waste consequently. The harmful material such as mephitis. After once discard as useless,using the cupreous radiator that this kind of craft produces, OK still 100 ％ ground reclaims completely, use at making new radiator again. Say so, technology of solder of cupreous good shot is a kind of new technology that can reduce cost to be able to protect an environment again already, new technology. Radiator is normally mix by radiating tube, carbon fin prop up advocate piece fuse bracket composition. Apply technology of solder of cupreous hard drill steel to produce radiator, its craft can be divided to come loose tropics is made, radiating tube is made, coating solder creams, assemble the fuse, oar that install solder, advocate piece install and heat drill rod solder a few measure. In whole craft, drill rod solder is a the most important segment. It asks furnace of drill rod solder can be in 450 - 650 ℃ heat workpiece, add quickly lukewarm, cool quickly, warm up speed should is more than minutely 30 ℃ , cooling rate is amounted to the most quickly minutely 150 ℃ . Because copper is hard the temperature outclass of drill rod solder is soft stannic solder, oxidize to prevent metal of the mother's body and filling, solder the process still needs aeriform protection, the nitrogen that uses tall purity furnace of solder of aerobic ferret drill rod. The applied range of technology of solder of cupreous hard drill steel is very wide, producible condenser of the radiator that is used at passenger car, lorry and project machine, warm fan, engine oil, medium cold implement, condenser and evaporator, there already were 5 companies to use this new technology in the United States, Russia, France and Japan at present, 8 companies that have the United States, Finnish, Thailand and China additionally are negotiating use this technology. CNC MillingCNC Machining