Why does it cause cracks in the tungsten moulding process?
Cracks can appear in the whole process of forming tungsten moulds in 1 link, control of the early stage, the powder is dispersed particles, with the control of the development, the relative density of the billet slowly rise, resulting in a billet with must look and compressive strength, but in the load and other external factors, and raw materials containing residues, lubricating fluid, inter-particle gas, chemical reaction of particles (such as surface air oxidation particles) If the internal elements, such as powdered crystalline dislocations, do not bond the billet part, the bonded billet will cause a lot of micro-cracks, micro-cracks and other ways of micro-flaws, and then the load and deformation level rises, if the non-bonded position is still not bonded or micro-cracks, micro-cracks and other ways of micro-flaws slowly accumulate, and then cause tungsten steel moulding crafts to cause macroeconomic cracks.
In the tungsten steel mold out of the mold link, because the binding force eliminates the whole process of each part of the pescado is not the same, resulting in part of the stress, resulting in cutting rupture cracks (microplate agglomeration type or pure cutting rupture cracks) or even through the crystal or along the crystal rupture cracks. Especially in the case of multiple staircase parts.
The general application of fluctuating die double press, this type of inattentive control system software for different staircase application relativity good several individual punch, although this punch and mandrel can reasonably manipulate the relative density of parts and raw material mobility. But the punch needle's different fitness movement composition on the press billet relative density distribution and cracks appear quite harmful.
