How to make stamping die

Manufacturing technology of stamping die: drawing parts, manufacturing process model, modeling, melting alloy and casting, cleaning die and modifying cavity. Taking the drawing die as an example, the technological process is introduced.

L, elevation view and manufacturing process model: according to the part drawing, the dimensions of each part are scaled according to the linear shrinkage coefficient of zinc alloy, and the sprue riser and chill are designed. So draw the model flow chart, and process the manufacturing flow model according to this chart.

2. Stamping die manufacturing: according to the dimensions provided by the model process drawing, high-quality wood is selected to make the stamping model. The dimensional accuracy of the model is required to reach the second-class accuracy of the wood model. Paint the surface of the wooden model so that the surface roughness Rz is less than 1 0 μ m m. The draft angle is1.

3. Mold model manufacturing: Mold manufacturing is to paste a layer of lead skin equal to the thickness of the product parts on the working face of the punch, so that the gap between the punch and a quarter. The lead surface of the punch should be painted, so that the roughness value of the die surface is small. Female die is made of plaster of Paris. In order to separate the male and female molds easily when casting gypsum, a layer of release agent (such as toluene solution of polystyrene) should be sprayed on the parting surface. Gypsum female die model should be dried for thousands of hours after casting, and then demoulded. The cavity surface and parting surface should be painted.

4. Modeling. Molding sand with high strength and fine particles is selected as the molding material. Because the casting temperature of zinc alloy is relatively low, the requirements for fire resistance and permeability of molding sand are not high. The male die and the female die can be modeled separately, and modeling methods such as sand box modeling or pit modeling can be selected. According to the requirements of the mold, the gating system adopts bottom injection or open type. Because of the large shrinkage coefficient of zinc alloy, feeding riser should be set up.

5, zinc alloy smelting

6. Casting: For small and medium-sized molds, dry casting or nickel casting can be used. Nie cast more exhaust holes. When casting zinc alloy, the alloy liquid flow should be slowly and smoothly injected into the cavity. For large molds, in order to prevent or reduce the deformation of the cavity, cooling water pipes or chillers can be set around the cavity during casting to ensure the orderly solidification of liquid alloy.

7. Cooling, cleaning and modification of zinc alloy die castings;

Generally, the cast die castings are naturally cooled, but small die castings with simple shapes can also be cooled by water cooling, which is beneficial to improve the mechanical properties of the alloy. For complex or large zinc alloy molds, casting and meshing should be cooled slowly. After the alloy is completely cooled, it is boxed, the boxed casting is cleaned with sand, and the pouring riser is removed by gas cutting. The cavity of the casting mold is no longer processed, but it should be polished with sandpaper, and the cavity and drawing die mouth of the mold should be polished, especially the drawing die mouth should meet the requirements of smoothness. Finally, the zinc alloy punch and die should be closed to process (milling or planing) the planes of the upper and lower bottom plates, so that the upper and lower bottom plates can contact with the press and maintain a certain parallelism to ensure the assembly accuracy.

Definition: Stamping die is a special equipment for processing materials (metal or nonmetal) into parts (or semi-finished products) in cold stamping, which is called cold stamping die. Stamping is a kind of pressure processing method at room temperature, which uses the die installed on the press to exert pressure on the material to make it separate or deform plastically, so as to obtain the required parts.

References:

Stamping Die _ Baidu Encyclopedia/Link? URL = RM when-smtweedepdy 2 bbd ce 0 lmqjbwf 1 vjq 4 r 0 N2 pkr 9 vabs wqh 7 fs 8 p 8 BD 1 Aho bv 6 mdqmdi 9 zdmd 8 wscudfa # 10