1. Surface deformation strengthening technology
1) Mold peening and action
The shot peening process is a process in which a large number of projectiles are sprayed onto the surface of the part, and the projectile is sprayed onto the surface of the part as if numerous hammers hit the surface. Therefore, the surface of the metal part is extremely strongly plastically deformed, so that the surface of the mold has a certain thickness. The cold work hardening layer, called the surface strengthening layer, significantly improves the fatigue strength of the part under high temperature and high stress working conditions.
2) Surface changes of shot peening
(1) Macroscopic residual stress.
(2) Microscopic stress of the surface layer.
(3) Micro-embedded structure of the surface layer.
3) Shot blasting machine and shot peening process parameters
The shot blasting machine has a pneumatic blasting machine and a centrifugal blasting machine. The pneumatic blasting machine is a compressed air supplied by an air compressor that causes a negative pressure to pass the projectile and sucks the nozzle at a high speed to form a surface of the part of the projectile jet. There is also a mechanism for moving the parts in the shot blasting machine to ensure the uniformity of the shot peening and a certain coverage. Shot peening mainly controls the shot peening strength. There is a certain shot peening strength for any given blasting operation condition, but it is necessary to determine the arc height curve to determine the shot peening strength.
2. Coating modification technology of mold
1) The hard chrome plating method plays an important role in the surface strengthening of some molds. It has the advantages of small coating friction coefficient, high hardness (about 1100 HV), simple application and repeated treatment. However, it should be noted that if the thickness of the coating is unreasonably selected, the mold will be damaged prematurely. When the mold is subjected to strong pressure or impact, the plating layer is easily peeled off, causing premature failure of the mold. Therefore, cold dies and punching dies cannot be plated with hard chrome, and it is only suitable for molds such as press bending and forming with less stress.
2) Nickel-plated phosphorus alloy
Immersing the pretreated workpiece into a solution containing nickel salt, reducing agent and other additives will cause an autocatalytic reduction reaction on the surface of the workpiece to reduce the nickel ions in the solution to metal and deposit on the surface of the workpiece (mold). A plating layer is formed.
3) Chemical vapor deposition
The method of surface coating according to the principle of chemical deposition is called chemical vapor deposition, abbreviated as CVD. The working part of the mold which needs to be permeable layer is heated to about 1000 ° C in a vacuum, and then leads to a reaction gas such as TiCl4, H2, CH4, etc., the gas encounters a high temperature working surface, and a compound such as TiN and TiC can be formed under the action of high temperature, and Firmly adhere to the surface of the mold part to form a super-hard coating.
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