Stamping mold is the process of making pressure on the blank so that the blank will undergo steel transformation or separation to produce work pieces with fixed sizes, shapes and properties.
The molds are made according to the processes of traditional milling or high speed, to reach the shape are used for 7-axis milling machines. The active parts of the mold are also used as electrical discharge machines (wire or tuff), lathes, and grinders.
In the precision metal stamping field, the mold must usually be designed without cavities that might restrict the removal of the piece: in particular, undercuts are to be avoided, that is, angles of 90° or more, which in fact make the printed indivisible element from the mold.
The stamp of a mold must pay particular attention to the draft angles: since the creation of the walls perfectly in axis with the extraction movement could give problems in the removal of the finished parts, the walls should never be designed vertical but must have a slight angle (1 or 2 degrees) to the outside. To exemplify, a cylinder should be converted into a truncated cone in order to be extracted without problems.
Material Of Stamping Mold
1.Carbon Tool Steel:
The advantages are good processing performance and low price. However, the harden ability and red hardness are poor, heat treatment deformation is large, and the bearing capacity is low.
2.Low-alloy Tool Steels:
Low-alloy tool steels incorporate appropriate amounts of alloying elements on the basis of carbon tool steels. Compared with the carbon tool steel, the tendency of quenching deformation and cracking is reduced, the harden ability of the steel is improved, and the wear resistance is also better.
3.High-carbon High-chromium Tool Steel:
They have good harden ability, harden ability and wear resistance, heat treatment deformation is very small. High wear-resistant micro-deformation die steel, bearing capacity second only to high-speed steel. However, serious segregation of carbides must be carried out by repeatedly forging (axial boring, radial plunging). To reduce the in homogeneity of carbides, improve the use of performance.
4.High Carbon Medium Chromium Tool Steel:
Which have lower chromium content, less eutectic carbides, uniform carbide distribution, and small heat treatment distortion. Has good harden ability and dimensional stability. The performance is improved compared to high carbon high chromium steels where carbide segregation is relatively severe.
5.High Speed Steel:
High-speed steel has the highest hardness, wear resistance and compressive strength in die steels, and has a high load carrying capacity. A carbon reduction vanadium high speed steel developed to improve toughness. High-speed steel also needs to be upgraded to improve its carbide distribution.
6.Base Steel:
Add a small amount of other elements to the basic ingredients of high-speed steel, and increase or decrease the carbon content to improve the performance of the steel. Such steels are collectively referred to as base steels. They not only have the characteristics of high-speed steel, have a certain degree of wear resistance and hardness, and fatigue strength and toughness are better than high-speed steel, high strength and toughness cold work die steel, material cost is lower than high-speed steel.