The Service of a Hard Coating on Stretching Metals MandrelThe Service of a Hard and Wear Resistant Coating on Stretching Metals Mandrel
Drawing is a metal working process which uses tensile forces to form metals or glasses. In this process, metal stretches into a desired shape or thickness. Drawing is classified in two types: sheet metal drawing and wire, bar, and tube drawing. Also, due to process temperature, there are cold working process (at room temperature) and hot working process (elevated temperatures). Hard working is used for large wires, rods or hollow sections in order to reduce forces. Different kind of tools are used in metal forming, a mandrel is a round object against which material can be shaped; or a tool component such as a chuck that grips or clamps materials to be machined in a lathe, or any other part which is to be spun or rotated. One of the mandrel applications is in tube drawing to form the internal hole. The process of tube drawing is similar to wire or rod drawing except that it usually requires a mandrel. Hence, mandrels used in tube drawing are exposed to wear and friction. Hard coatings such as CrN, TiN, TiAIN, TiCN are used for reducing friction and improving wear properties. PVD (Physical Vapor Deposition) is one the methods to deposit hard coatings. This process is eco-friendly and coatings produced by this method is resistant to temperature and abrasion.
Coating of mandrels used in drawing processes
- Increment of hardness and abrasion resistance due to nanometric structure of coatings
- Improvement of frictional and mechanical properties of coatings
Standard Date : 2015/07/30
Expire Date : 2018/07/29