Trimming device in the process of cutting, and workpiece cutting part of the direct contact to bear great cutting force, especially a cutting edge and adjacent to the surface before and after the knife, in cutting work in high temperature environment for a long time.
Cutting of all sorts of uneven and unstable factors, will also for trimming machine cutting part of varying degrees of impact and vibration. Before cutting steel, such as: chip of the extrusion stress for up to 2 fpa ~ 3 fpa. In order to adapt to such a heavy cutting load and poor working conditions, trimming tool material should have the following several aspects performance.
1, sufficient hardness and wear resistance, hardness is the basic properties of the cutting tool material should have. Cutting tools should be higher than the hardness of workpiece material hardness, hardness under normal temperature which generally in more than 60 HRC.
2, enough strength and toughness: cutting trimming device to bear larger cutting force, impact and vibration, to avoid collapse and knife broken, cutting tool material should have enough strength and toughness. Strength and toughness of material is usually expressed in bending strength and impact value.
3, high heat resistance and heat transfer, the heat transfer coefficient of cutting tool material, makes the heat coming from lower cutting temperature in cutting.
4, good manufacturability and economy: in order to facilitate the processing and manufacturing of leather trimming knife, the cutting tool material should have good process performance, such as hot rolling, forging, welding, heat treatment and machining performance, etc.
There isn't a trim materials can have all the best indicators of performance, so when choosing cutting tool material should be a reasonable choice.