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一、问题的提出佛山市澜石铝型材厂生产的铝型材产品,使用4Cr5MoVSi钢制造各种铝合金挤压模具,经试模修整后使用。在挤压前,将模具和铝锭预热至450～470℃,挤压后的产品表面粗糙度为3.2左右。由于模具在热状态下长期工作,刃口被磨损,挤压出的产品光洁度下降,甚至尺寸超差。因此模具使用寿命短,一般低于2t/套,成了生产中急需解决的主要问题。为此试验了多种热处理工艺,以期提高这类模具的使用寿命。二、盐浴渗氮工艺方案的确定
First, the question raised Foshan Lanshi aluminum factory production of aluminum products, the use of 4Cr5MoVSi steel manufacturing all kinds of aluminum extrusion die, after the test mode trimming use. Before extrusion, the mold and ingot are preheated to 450-470 ° C, and the surface roughness of the extruded product is about 3.2. As the mold in the hot state of long-term work, the blade is worn, squeezed out of the product finish, or even size difference. Therefore, the mold life is short, generally less than 2t / set, became the production of the urgent need to solve the main problem. To test a variety of heat treatment process, in order to improve the life of such molds. Second, salt bath nitriding process program to determine