In the purchase of wire drawing die,we always want to buy the product is the best,the best is no defect,so we must learn to buy a diamond die is good or bad,only will read,Can be selected to a most suitable of their own wire drawing die.
If the price from the point of view,the natural wire drawing dies price is certainly more expensive,but it is expensive to have his reason,because this type of drawing die itself is more complicated in the processing time The kind of.Natural Diamond Wire Drawing Dies has a very high hardness,but it is easy to cause friction,so this type of drawing die can only be used in some of the smaller diameter of the material,but its wear resistance is the best.
There is also a carbide mold,the hardness of this film is relatively low,the surface is not very rough,but its wear resistance is relatively poor,coupled with its relatively low hardness,usually not recommended to buy of.Selection of diamond wire drawing die is like the selection of explosion-proof electric heater,to be particularly careful,you carefully against it,it will also you a rest assured.
Blank in the drawing die cavity plastic degeneration,along the cavity surface both flow and slide,so that the cavity surface and the material between the sharp friction,resulting in wire drawing dies due to wear and failure.So the wear resistance of the material is the most basic drawing,the most important one of the performance.
Hardness is the main factor affecting wear resistance.Under normal circumstances,the higher the hardness of the drawing die parts,the smaller the wear,the better the wear resistance.In addition,the wear resistance is also related to the type,quantity,shape,size and distribution of carbides in the material.
1. Toughness
Drawing die most of the working conditions are very bad,and some often bear a greater impact load,which led to brittle fracture.In order to prevent the mold parts in the work suddenly brittle,drawing die to have a high strength and toughness.
2. The toughness of the mold depends mainly on the carbon content of the material,grain size and tissue state.
Drawing die work in the process,the long-term role in the cyclic stress,often lead to fatigue fracture.Its form has a small energy multiple impact fatigue fracture,tensile fatigue fracture contact fatigue fracture and bending fatigue fracture.The fatigue fracture properties of the drawing die are mainly determined by its strength,toughness,hardness,and the content of inclusions in the material.
3. Cold and hot fatigue resistance
Some of the drawing die in the course of the work in the repeated heating and cooling state,so that the cavity surface tension,the role of stress stress,causing the surface cracking and peeling,increase friction,obstruct plastic deformation,reducing the dimensional accuracy,thus Resulting in mold failure.Hot and cold fatigue is one of the main forms of hot die failure,to help this type of drawing die should have a high resistance to hot and cold fatigue performance. |
