Mould graphite

  Foundry machinery industry in the extensive use of graphite materials as mould pressure casting, centrifugal casting, super hard alloy hot extrusion processing, to train wheels, small precision parts can be used in graphite mold. The graphite mould can be repeatedly used for many times, and the casting after the mold release has a high degree of finish, and some can be used without further processing. As the graphite casting mould should be compact and low coefficient of thermal expansion of graphite, good oxidation resistance, used for casting the larger size of the graphite can be composed of coarse grains and small precision parts for casting graphite must use the fine particle structure of graphite. China used to manufacture a large number of graphite mold, in 2005 for the continuous casting of graphite about 1500t, the need for the use of graphite for sintering 4000t. Table 4 shows the fine structure of graphite carbon factory production in Shanghai Jilin Carbon group specifications and technical performance.

  In the graphite mould with metal continuous casting graphite quality requirements of the most stringent requirements of the high thermal conductivity, good thermal stability and thermal shock resistance, good lubrication, no infiltration of molten metal, and metal casting reaction, easy processing and mold precise dimensions. The characteristics of continuous casting graphite are as follows: bulk density 1.7-1.9g/cm, flexural strength 30-40MPa, tensile strength 20-30MPa, thermal conductivity 100 < 130 W/ (m K).

  MM 200 X 1260 X mm 280 mm X mm 1000 X mm 70 240 mm casting speed according to the size of the cast plate varies according to the size of the plate. The range is 0.7 m/min ~4. The fine grain structure graphite formed by the cold pressed fine granular structure graphite or the like can be processed into a metal continuous casting graphite piece.