The Service of a Hard Coating on Hot and Cold Metal MoldsThe Service of a Hard and Wear Resistant Coating on Hot and Cold Metal Molds
For production of aluminum parts with a uniform thickness of 5 to 15 mm, die casting is used as a production method. Die casting is a casting process that is characterized by forcing molten metal under high pressure into a die cavity. Good surface quality and high production rate are the advantages of this process. Production with high quality and without burr defect eliminates many steps of process such as deburring, grinding and drilling. As a result, it reduces the costs of production. Die molds used in this kind of casting are made of hot work steel with high thickness and volume which can withstand the high melting pressure. Hence, the casting dies are large and expensive. One of the major concerns in die casting is the durability of die materials/surface when they are exposed to pressurized casting process during. In addition, high temperature condition may cause cracks, fatigue and corrosion. PVD (Physical Vapor Deposition) coatings such as CrN, TiN, TiAIN, TiCN etc. provide resistance to corrosion and wear for dies and components and also lower the coefficient of friction. Furthermore, these coating increase fluidity of forming material and improve forming performance. For instance, demolding become easier. Increasing lifetime of dies, lowering the need of lubricants and chemical inertness are the other properties which are achieved by PVD coatings. Nanostructured coatings improve abrasion and corrosion resistant and hardness of die and components.
Coating the internal surface of metal die molds
- Increment of hardness and abrasion resistance due to nanometric structure of coatings
- Improvement in mechanical and frictional properties
Standard Date : 2015/07/30
Expire Date : 2018/07/29