Drawn tube mould processing process classificati... 2017-01-12

　　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.

Heat treatment technology of the roll 2017-01-12

　　Drawn tube mould manufacturer Small make up to tell you heat treatment technology of the roll　　Roll according to the working state can be divided into hot rolling and cold rolling, can be divided by the role of the work roll and intermediate roll and backup roll, according to the material can be divided into forging roll and casting roll (chilled cast iron). Normally roll service conditions are rigid, in the process of the work under high alternating stress, bending stress and contact stress, shear stress and friction. Prone to wear and spalling failure in the form. Different USES, different types of roll in their specific conditions, its general performance requirements are as follows: roll type, the main performance requirements, work roll hardness ℃ temperature.　　Hot rolled　　Hot rolled work roll thermal fatigue crack resistance, rough surface resistance performance of HB: room temperature 196 ~ 302 ~ 850, cold rolled work roll high hardness, wear resistance, fatigue spalling resistance HS: room temperature 90 ~ 105 ~ 90.　　Does not allow for hot roll, roll surface, the surface crack defects cause stress concentration and accelerate the extension and disable roll. Thermal fatigue cracks are mainly caused by periodic alternating thermal stress, severe cases, the crack propagation may cause roller surface spalling, even roll breakage.　　Main failure forms of cold roll including cut, glue roller and spalling, etc. Cold roll roll surface should be high and even hardness, their quality performance in the work layer of roll abrasion resistance, namely rough resistance.　　Hot rolling work rolls are generally with heat treatment after forging and heat treatment of quenched and tempered.　　(1) heat treatment after forging　　The main purpose of heat treatment after forging is to eliminate stress after forging, refine grain and improve the cutting performance. Heat treatment after forging and diffusion hydrogen. Diffusion hydrogen time depending on the ingot hydrogen content, it is generally believed [H] 2 x 10-4% or less, can cancel the diffusion hydrogen processing.　　(2) conditioning　　Final heat treatment is the conditioning of hot rolling work rolls. The qualitative purpose is to guarantee the roll surface hardness and mechanical properties, and guarantee the core enough toughness.　　Cold rolled　　Cold rolled work roll time generally have heat treatment after forging, heat treatment and tempering and surface hardening.　　(1) heat treatment after forging　　Heat treatment after forging the purpose is to reduce the hardness, eliminate the residual stress, but also improve the organization, get fine pearlite, eliminate the carbide network. Heat treatment after forging and diffusion hydrogen. Diffusion hydrogen time depending on the ingot hydrogen content, it is generally believed [H] 2 x 10-4% or less, can cancel the diffusion hydrogen processing.　　(2) conditioning　　The quality objectives are to provide surface quenching organization, make the roll neck and roll heart get strong toughness with good spheroidal pearlite organization, good comprehensive mechanical properties, to withstand intense surface quenching.　　(3) the surface hardening　　The work roll surface quenching get high hardening layer. Surface hardening methods according to the heating method can be divided into the overall rapid quenching method and continuous induction heating quenching method, the latter is more widely used in the production practice.　　In continuous induction heating quenching process approach double-frequency induction hardening has distinguishing feature very much, it USES the sensor matching of two different frequency induction heating, the roller surface temperature control and heating temperature distribution has obvious advantages. Typical double-frequency quenching equipment in large power frequency current penetration depth sensor as the main sensors, realize the deep heating, soaking after a period of time, and then use a medium frequency sensor to get deeper after isothermal austenitizing layer, to obtain the required after quenching hardening layer depth.