What are the characteristics of the mould of EDM?
Using wedm processing and mold parts, the choice of material and the die structure, should consider the characteristics of wire-cutting processing technology, to ensure that improve machining precision and service life of mould.
(1) the material selection of the cutting mould parts processing is blank in the mold parts Zuo hard after heat treatment, if choose carbon tool steel manufacturing, due to its poor hardenability, wire forming, due to the effective hardening layer shallow, after several grinding, will be a significant reduction in hardness, mold shorten service life.In addition, after quenching, the residual stress is large, and it is easy to cause deformation in the line cutting process, which directly affects the machining precision.
In order to improve the machining accuracy and service life of the die parts of the line cutting process, it is necessary to choose the hardened alloy tool steel (such as Crl2, CrWMn, Cr12MoV, etc.) or hard alloy.
(2) structure characteristics of wire cutting processing dies.
1) using wire cutting processing technology, the punch and die can adopt the whole structure.This can reduce the manufacturing time, simplify the mold structure and improve the mold strength.
2) the dimension of the punch and die fixed plate type of the wire cutting is the same. In order to ensure the connection strength of the punch and the fixed plate, the double profit of 0.01 ~ 0.03mm is generally adopted.If the convex model surface is large, other mechanical fixation or chemical fixation can be used.
3) when the line cutting machine is not cut, the model hole is not inclined.In order to facilitate the leakage, the thickness of the concave die should be reduced as far as possible under the premise of ensuring the strength, and then, after the wire cutting is processed, the electric spark machining or file can be used to repair the slope of the leakage.