A manufacturing process of a composite material mold

Abstract

The invention discloses a composite material mold and its manufacturing process. The composite material mold includes an inner mold and an outer mold, and a graphite layer is arranged between the inner mold and the outer mold. Compared with the prior art, the invention has simple structure, low implementation cost and obvious effect. When the outer mold and inner mold of the composite material mold are used for preheating, the inner mold expands more than the outer mold, and the outer wall of the inner mold is coated with graphite slurry. When preheating and extrusion, the graphite slurry can fill the gap between the inner and outer molds. The gap between the inner and outer molds can be further sintered to form a graphite layer, so that the outer mold and the inner mold can fit closer together. Due to the good thermal conductivity of the graphite layer, the heat conduction between the inner and outer molds can be uniform, and the resulting blank can be produced as a whole. The quality is consistent, and the scrap rate and deformation rate caused by uneven cooling are significantly reduced.

Description

technical field [0001] The invention relates to a composite material mold and a manufacturing process thereof, belonging to the field of foundry tooling equipment. Background technique [0002] Cylinder liners produced by water-cooled metal mold centrifugal casting have the advantages of high efficiency and compact casting structure. However, sleeve-type composite molds are often used in cylinder liner manufacturers. The formation process of traditional sleeve-type composite molds directly assembles the inner mold on In the outer mold, at the beginning of the centrifugal casting cylinder liner, the mold is preheated at 400-450°C, and the mold heats up and expands. Due to the large heating expansion of the inner mold, there is a certain amount of interference between the inner mold and the outer mold during the preheating process. However, due to the roundness and straightness errors of the inner wall of the outer mold and the outer wall of the inner mold during the processin...

AI Technical Summary

Problems solved by technology

[0002] Cylinder liners produced by water-cooled metal mold centrifugal casting have the advantages of high efficiency and compact casting structure. However, sleeve-type composite molds are often used in cylinder liner manufacturers. The formation process of traditional sleeve-type composite molds directly assembles the inner mold on In the outer mold, at the beginning of the centrifugal casting cylinder liner, the mold is preheated at 400-450°C, and the mold heats up and expands. Due to the large heating expansion of the inner mold, there is a certain amount of interference between the inner mold and the outer mold during the preheating process. However, due to the roundness and straightness errors of the inner wall of the outer mold and the outer wall of the inner mold during the processing process, it is often impossible for the bonding surface between the inner mold and the outer mold to completely interfere, and a certain gap (air ), therefore, in the production of cylinder liners by centrifugal casting of water-cooled metal molds, these local gaps are poor conductors of heat, which often make the local cooling of the cylinder liner blanks slow, resulting in inconsistent overall quality of the blanks, and at the same time causing casting waste, machining deformation waste, etc. improvement

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