The Service of a Hard Coating on Metal forming MoldsThe Service of a Hard and Wear Resistant Coating on Metal forming Molds
In sheet metal forming, the flat plates usually steel ones are deformed plastically to get the desire shape. In the case of complicated product shapes, several processes are necessary to achieve the final shape. In this process frictional properties get as high importance as deformation for achieving optimal process. Unfavorable friction properties can cause waste of time, cost and reduction of production. Frictional surfaces involved in sheet metal forming are tool surfaces, die surfaces and coated sheet. In SMF (sheet metal forming) the control of friction level has a significant role since it influences the stress and strain distribution in the sheet. It should be neither too high nor too low to obtain a sheet with desirable quality. Another thing in sheet metal forming which should be considered is wear. The main wear mechanisms have been identified as adhesive wear due to the high loads applied, abrasive wear, and mechanical fatigue due to cyclic loading. Lubricants are used to provide proper frictional properties and wear resistance. Since these lubricants cause environmental problems and are often hazardous, it is necessary to reduce its usage where possible. For lubricant usage reduction and improvement of mechanical properties, hard coatings have become common. These coatings have low friction coefficient and their usage is according to this feature. Hard coatings are often TiN, CrN and TiCN and an alternative to DLC (Diamond-Like Carbon) coatings.
Coatings for tools and dies in sheet metal forming process
Nanostructured coatings with abrasion resistance and proper friction properties
Increment of hardness and abrasion resistance due to nanometric structure of coatings
Standard Date : 2015/07/30
Expire Date : 2018/07/29