Mold shape determines the shape of these products, mold processing quality and precision also determines the quality of these products. Due to the different materials, appearance, specifications and USES of various products, molds are divided into non-plastic molds such as casting mold, forging mold, die-casting mold, stamping mold, and plastic mold.
Metal mold is in industrial production, with a variety of presses and installed on the pressure machine special tools, through the pressure to metal materials to make the required shape of the parts or products, this special tools collectively referred to as hardware mold. We use a variety of tools and products in daily production and life, from the base of the machine tool, fuselage shell, small to a blank head screw, buttons and a variety of household appliances shell, all have a close relationship with the mold. Mold shape determines the shape of these products, mold processing quality and precision also determines the quality of these products. Due to the different materials, appearance, specifications and USES of various products, molds are divided into non-plastic molds such as casting mold, forging mold, die-casting mold, stamping mold, and plastic mold.
Process characteristics
(1) the blanking die separates the material along the closed or open profile. Such as blanking die, punching die, cutting die, cutting die, cutting die, cutting die, and so on.
(2) bending die a die that causes a blank or other blank to bend and deform along a straight line (bending line), thereby obtaining a workpiece with a certain Angle and shape.
(3) drawing die is a die that makes the blank of sheet material into open hollow parts, or makes the hollow parts change the shape and size further.
(4) forming die is a die that directly replicates the blank or semi-finished workpiece according to the shape of convex and concave die, and the material itself only produces partial plastic deformation. Such as expansion die, shrink die, die, undulating forming die, flanging die, plastic die.
Process combination
(1) single process die only completes one stamping process in one stroke of the press.
(2) the compound die has only one station. In one stroke of the press, two or more stamping processes are completed simultaneously at the same station.
(3) progressive die (also known as progressive die) has two or more stations in the direction of feed of the blank. In one stroke of the press, two or more stamping processes are completed successively at different stations.
Continuous die (progressive die), the press in a stamping stroke, the use of ribbon stamping raw materials, in a pair of die with several different stations at the same time to complete a number of cold stamping process stamping die, die each stamping completion, material belt fixed distance move once, until the completion of the product.
During the stamping process, the material belt always moves in one direction. A progressive die is one that moves in two or more directions after cutting the material belt inside the die. The material with feeding in the mold is called automatic continuous die; In a stamping production chain with different processes of stamping die manipulator or other automation facilities, the use of die or parts to complete the stamping of workpiece processing rated die is called multi-station die.
Mold material
The most important factors of die material are thermal strength and thermal stability
<300℃ zinc alloy Cr12, Cr12MoV, GCr15, T8, T10.
300 ~ 500℃ aluminum alloy, copper alloy 5CrMnMo, 3Cr2W8, 9CrSi, W18Cr4V, 5CrNiMo, W6Mo5Cr4V2, M2.
500 ~ 800℃ aluminum alloy, copper alloy, steel titanium 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.
Mould parts
One of the key components in die accessories is die spring.
Mold springs include: Japanese standard mold spring, German standard mold spring, spring, polyurethane spring, usually refers to the rectangular mold spring.
Die springs are widely used in stamping die, metal die casting die, plastic die and other fields such as elastic movement precision mechanical equipment and automobile.
Die spring material generally selected chromium alloy steel. Chrome spring steel has the characteristics of high temperature resistance, high rigidity and long service life.
Rectangular die spring has the characteristics of small volume, good elasticity, large stiffness, high precision, rectangular material, surface color separation spraying (plating) to distinguish different load, beautiful appearance and so on.
Mold design
(1) conduct research on the direction of materials (product materials, mold materials).
(2) gap size of concave and convex die.
(3) the position and quantity of leading pins are sufficient.
(4) whether the scrap rebound is considered and whether the mold discharging is smooth.
(5) whether the monitor and waste rebound sensor are designed.
(6) proper selection of positioning plate and floating pin.
(7) whether the number, size and location of bolts (including unloading bolts) are appropriate.
(8) consider blanking force and choose punching machine.