Mold Engineering Knowledge Introduction

• What is remelting (ESR)? Remelting What is the role?
  ESR is a method of refining the United States Hopkins (RKHopkins) in the 1940s, first proposed the project in Dongguan ESR mold ingot mold steel is used as the electrode, the use of current through the slag layer generating resistive heat to melt the electrode, the liquid metal in the form of droplets fall through the slag layer to the inner water-cooled metal crystallizer bath, gradually bottom ingot crystallization process. Its main role is to cleanse and purify the metal and get a uniform dense ingot organization, through the purity of remelting of steel and macro-segregation can be significantly improved.

• EDM in the “ignition” What is a phenomenon? What is the harm?
  EDM process in the tool electrode and the workpiece is close to each electrode, the electrode is formed between the spark discharge pulse of Dongguan produce instantaneous high temperature engineering EDM mold channel, so that local melting of the metal, or even vaporized, so that the molten metal down the erosion . “Ignition” is due to the discharge of molten debris accumulation has not been discharged, causing a short circuit between the electrode and the partial mold surface, so that the discharge energy in the “ignition” point of focus on the release of the phenomenon. This phenomenon is similar to a short circuit in the “ignition” point of abnormal heat affected zone (commonly known as the white layer), due to the high hardness white, crisp, corrosion resistance and the presence of micro-cracks, it will affect the subsequent etch or polishing effect.

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