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　　Drawn tube mould manufacturer small make up to tell you drawn tube mould processing process classification

　　The metal mold

　　Mould according to the machining technology of metal classification, commonly used are:

　　Stamping die, including blanking die, bending die, drawing die, flanging die, reducing die, and die, the bulging die, plastic mould, etc.;

　　Forging die, including forging die, upsetting forging die, etc; And the extrusion die and the die mold.

　　Used for processing nonmetal and powder metallurgy mold is according to the processing object naming and classification, with a plastic mould, rubber mould and powder metallurgy mold, etc.

　　1. Stamping die moulds for sheet metal stamping and separation. Forming with mold cavity and separation with mold parts. The most commonly used a multi-level structure of stamping die, complete production process. This kind of mould application widely, structure is simple, easy manufacture, but the production efficiency is low. In order to improve productivity, can be more than stamping process, such as blanking, deep drawing, punching and trimming arranged in the same mould, make the billet in the same location on multichannel stamping process, this mould is called composite modulus. Otherwise the blanking, bending, drawing, punching and trimming process arrangement in different location in the same mold, the mold is called progressive die (also known as continuous mode).

　　2. Die used for hot die forging forming of metal mold. Die forging, often after a lot of deformation can be made from forging, which requires in a module with several cavity. Metal, in turn, sent to each cavity, and plastic flow inside the cavity, the last full of cavity made of forgings. In die forging forming, billet and finish forging cavity volume equal to very hard, in order to avoid waste, billet choose slightly bigger. Therefore, in the end of the forging die around the boundary between upper and lower die cavity with flash tank, to store excess metal, formed to cut the flash. Should try to reduce the Angle, deep groove in the cavity, so metal plastic flow and filling, reduce the die wear and cracking, improve die life.

　　3. The extrusion die for extrusion forming of metal mold. Are extrusion die with a static extrusion die and billet tube and the pressure on the blank of the punch. Extruded hollow parts, punch the front with a mandrel. Of the extrusion die is to die, punch punch. Metal need to be in a lot of pressure from the concave die extrusion forming, in the cold under the required pressure can be as high as 2 million cattle/mm (more than 200 kg/mm). Therefore, the extrusion cylinder and backward extrusion concave die needs to have high strength, often use multilayer prestressed composite structure. The punch and punch working length should be short, avoid under high compressive stress instability and bending.

　　4. The die-casting die is installed on the die casting machine, liquid metal injection mold cavity under high pressure, the pressure to metal solidification and forming mould. It is mainly used in aluminum, zinc, copper, steel parts is also available. The structure of die mold similar to plastic injection mould. It consists of moving die and die cavity, with the core hole cavity formation of castings. Metal in the cavity spare cores after cooling and solidification, separated from the mold, launched by the plunger castings. Die casting thin wall hollow commonly, there are numerous, tendons, complex shape, size requirements more precise, the surface is bright and clean, under the high temperature of molten metal forming. So die mold need to use high temperature resistant materials.

　　5. Powder metallurgy mold will be solid metal powder compacting mold. The metal powder quantitatively poured into the mould, and then moulded, closed, shaping, reoccupy lifter device blocking out. Send pre blocking to sintering furnace sintering, hence made of powder metallurgy parts. Is a big gap of common powder metallurgy parts, accounting for about 15% of the total volume, forming pressure, the mould structure is simple, the precision, surface roughness requirements, so no special requirements to the mold. In order to reduce the gap and increase the density and intensity, the ware after sintering, again hot forging, known as powder forging. Used in the mold and stamping die.

　　Mold material

　　Mold material is one of the most important factor is the hot strength and thermal stability, and common mold material: working temperature, forming material, mold material

　　< 300 ℃ zinc alloy Cr12, Cr12MoV, S - 136, SLD, NAK80, GCr15, T8, T10.

　　300 ~ 500 ℃ aluminum alloy, copper alloy 5 crmnmo, 3 cr2w8, 9 crsi, W18Cr4V, 5 crnimo, W6Mo5Cr4V2, M2.

　　500 ~ 800 ℃ of aluminum alloy, copper alloy, titanium steel GH130, GH33, GH37.

　　800 ~ 1000 ℃ titanium alloy, steel, stainless steel, nickel alloy K3 and K5, K17, K19, GH99, IN100, Ж C - 6 nx88, MAR - M200, TRW - NASA, WA.

　　> 1000 ℃ nickel alloy, copper base alloy die, carbide die.