Craft of cold treatment of cutting tool ice is to be in - 80 ℃ have cold treatment in the temperature of or so, these technical application arrive on cutting tool, measure, accurate instrument, increased the use value of the product not only, also improved work efficiency greatly. The processing technology of cutting tool has a lot of kinds, putting cold treatment craft on the ice among them have technical difficulty very much. Frozen processing is to be in - cold treatment has in the temperature that 80 ℃ control, commonly used wait for the work with higher demand of a few precision to go up at measure, accurate bearing, cutting tool, can raise tool hardness, wear-resisting to spend so, dimension stability. As we have learned, the cold treatment craft of cutting tool is to show martensite change stops name a person for a particular job to fall 0 ℃ are the following microtherm, the leftover austenite of moster quantity is contained in the organization after quenching, it is martensite to make leftover austenite transforms, the way that puts the work after quenching cold medicine or add of refrigeration machine relay to cool. Iciness handles temperature to answer the chemical composition according to rolled steel (Mf is nodded) come make choice of. To most rolled steel mixture of dry ice, alcohol (- 78 ℃ ) can satisfy a requirement. Iciness is in behoove to undertake instantly after quench, lest be placed for a long time,bring about leftover austenite to generation stability is changed and affect cold treatment result. The workpiece with a few complex form is crackle of the generation when avoiding cold treatment, can be in via temper hind cold treatment. More expensive to demand of stability of a few dimension work, wait like whorl gauge, often require cold treatment twice. Cold treatment must have temper or effectiveness for a given period of time, in order to eliminate the martensite organization that a formation stress and stable new student become. Workpiece is when frozen processing need not heat preservation, reach cold medicine temperature when its core only can (general 1 ～ 2h) . The workpiece after frozen processing is taken out from inside cold medicine, slow in air warm up to lukewarm to room temperature hind, undertaking temper is handled. Majority of frozen processing temperature is in - ℃ of 70 ℃ ~-80 is given priority to, the temperature that chooses frozen processing basically is the MS according to steel (martensite change begins temperature) with Mf (temperature of martensite change cease) temperature undertakes, the technology that also follows a spare parts asks to concern. Mf of ＜ of Ms ＜ T. Not be temperature lower better, should satisfy a technology to ask only can. Steel of cementite of low carbon alloy is more - ℃ of 70 ℃ ~-80. Frozen processing technology has the value that his oneself exists, machine the machine that pass through putting cold treatment craft on the ice, other machine cannot compare your characteristic. If machine of air turbine refrigeration is,according to compressing air to expand refrigeration fundamental is made, its characteristic is marked, the first, refrigeration rate is rapid, can reach craft temperature quickly. The 2nd, environmental free from contamination, refrigeration medium is compress air. The 3rd, working temperature range is wide, without frost. The 4th, case of refrigerator, low temperature is separate, facilitate upgrade transform. The mainest is it the operation is simple, maintenance is convenient. Technology of cold treatment of cutting tool ice has be productioned scientificly according to the chemical component of rolled steel, these technical application arrive on cutting tool, measure, accurate instrument, increased the use value of the product not only, also improved work efficiency greatly. CNC Milling
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