The manufacture of aluminum extrusion mold is also one of the key factors to determine the quality and service life.Due to a series of characteristics of aluminum extrusion mold, the mold technology of aluminum profile mold needs high requirements:
1, because the working conditions of aluminum alloy extrusion die is very bad, need to withstand high temperature and high pressure in the extrusion process, the effect of high friction, therefore, requires the use of high-strength alloy steel, and these steel smelting, casting, forging, heat treatment, machining, mechanical processing and surface treatment process is very complex, it bring a series of difficult mould processing.
2. In order to improve the service life of aluminum extrusion mold and guarantee the surface quality of the product, the roughness of the die cavity working belt is required to reach 0.8-0.4 m, and the roughness of the die plane is required to reach below 1.6 m. Therefore, special polishing process and polishing equipment are required for mold making.
3, because of the extrusion product to develop in the direction of high, refined, sharp, some profiles and pipe wall thickness requirements to around 0.5 mm, the aluminum extrusion tolerance requirements to + / - 0.05 mm, in order to squeeze the ultra-high precision products, requirements of die & mould manufacturing accuracy of 0.01 mm, adopts the traditional process is cannot be made, therefore, request update technology and adopts the new type of special equipment.For example: CNC lathe, CNC machining center and slow wire processing and other advanced high precision processing equipment.
4, aluminum section is very complex, especially the ultra-high precision of the thin-wall hollow extrusions and empty XinBi porous plate aluminum extrusions, require the use of special structure of extrusion die, often in a mold to open at the same time have more than one profile hole cavity, the thickness of each section change sharply, the related dimension complex, arc corner lot, it brings to the mold processing and heat treatment of a lot of trouble.
5, aluminum extrusion processing and product variety, small batch, frequent changing of the mold, and mold of strong adaptability, therefore, request increase the productivity of the moulding, try to shorten the molding cycle, can change very quickly molding process, accurate to work out qualified according to the drawing mould, reduce the workload of repairing mold to * low degree.
6, due to the aluminum extrusion processing products increasingly wide range of application, the range of specifications is very broad, so, there are light to several kilograms, the outline size of 100mm×25mm small mold, but also weigh more than 2000kg, the outline size of 1800mm×450mm large mold.There are small squeezes with dimensions of 65mmx800mm ranging from a few kilograms to large squeezes with dimensions of 2500mmx2600mm weighing more than 100t.The huge differences in mold specifications and quality require completely different manufacturing methods and procedures, and totally different processing equipment.
7. There are many kinds of extrusion moulds with complex structure and high requirements for assembly precision. In addition to special processing methods and special equipment, special tools, tools and special heat treatment methods are required.
8, in order to improve the quality and service life of die, in addition to choose reasonable materials and optimization design, still need to use * better heat treatment and surface strengthening treatment technology, in order to obtain the mold hardness of moderate and high surface quality, shape for the extremely complex difficult extrusion products is especially important and special structure of the mould.
In summary, the processing technology of aluminum extrusion mold is different from the general mechanical manufacturing process, but a difficult, involving a wide range of special technology.In order to produce high quality and high life of the mold, in addition to the selection and preparation of high-quality mold materials, it is necessary to develop a reasonable cold processing technology, electrical processing technology, heat treatment technology and surface treatment.