Mould wear is a common phenomenon and inevitable in the […]
Mould wear is a common phenomenon and inevitable in the use process of Household Product Mould. What we can do is to minimize mould wear and prolong its service life. When we reduce mould wear of household product mould, we must first know why the mould wears.
The root cause of wear for household product mould is the mutual friction between mould parts and parts (or blanks) or between mould parts and parts. Wear leads to dying failure, which is manifested as blunting of blade gate, rounding of edges and corners, plane subsidence, surface groove marks and peeling of the mucosa. In addition, during the work of the punch, the lubricant is converted into high-pressure gas after combustion, which severely scours the surface of the punch and forms cavitation.
During cold punching, if the load is not large, the wear type is mainly oxidation, and the wear can also be occlusal wear to some extent. When the cutting edge becomes blunt or the punching load is large, the occlusal wear will become serious, thus accelerating the wear. In the case of severe carbide segregation or large particle carbides in die steel, these carbides are easy to flake off, causing abrasive wear and accelerating the wear.
The impact of light cold work dies steel (sheet blanking, stretching, bending, etc.) is not heavy, mainly static wear. Under the condition of static wear, the die steel contains more carbon and its wear resistance is greater. Under impact wear conditions (such as cold heading, cold extrusion, hot forging, etc.), excessive carbides in die steel do not help to improve wear resistance but reduce wear resistance due to impact abrasive wear.
The above is an introduction to the causes of wear of household product mould analyzed for everyone. Generally, under the condition of impact abrasive wear, the carbon content of die steel is limited to 0.6%, and the cold heading die works under the condition of impact load. For example, too much carbide in die steel is easy to cause solid impact wear and peel off the surface. These exfoliated hard particles will become abrasive particles, accelerating the wear rate. Therefore, we should reduce the occurrence of this kind of situation in the work of household product mould.