Casting method of large-scale high pressure resisting multi-cylinder-block cast

Abstract

The invention relates to a casting method of large-scale high pressure resisting multi-cylinder-block cast. The method includes the following steps: (1) mold making, (2) sand mold making, and (3) casting molding: during the sand mold making of the step (2), a sprue is designed into a first sprue (1) and a second sprue (3), a cross gate is designed into a first cross gate (2) and a second cross gate (4), and an ingate (5) is designed into a plurality of parallel pouring gates. Cross section area of all pouring gates is set as the following relation: the cross section area of the first sprue (1) is larger than that of the first cross gate (2), the cross section area of the first cross gate (2) is smaller than that of the second sprue (3), the cross section area of the second sprue (3) is larger than that of the second cross gate (4), and the cross section area of the second cross gate (4) is smaller than that of the ingate (5). The casting method overcomes the defects that shrinkage cavities, shrinkage porosities, slag inclusion and the like do not exist in the cast and can meet quality requirements that cylinder holes can be used as cylinder inner walls after the cylinder holes are machined.

Description

technical field [0001] The invention relates to the casting field of castings, in particular to a casting method of large high-pressure resistant multi-oil cylinder castings. Background technique [0002] At present, with the increasing size of plastic products, injection molding machines, as the main production equipment of plastic products, are becoming larger and larger, and the size of injection molding machine parts is also increasing. The oil cylinder block is one of the key parts of the injection molding machine. Due to its complex structure, it is usually made by casting; The thickness is 110mm, the maximum wall thickness is 200mm, and the external dimensions are 3250mm×2800mm×1350mm. It is required that there should be no shrinkage cavity, shrinkage porosity, inclusions, air gaps, cracks and other defects inside the casting, and the cylinder block must be cast and After machining the cylinder bore, the cylinder bore can be used as the inner wall of the cylinder. ...

AI Technical Summary

Problems solved by technology

[0003] For this kind of large multi-cylinder casting, its structure is complex, and the wall thickness is quite different. When the traditional casting method is pouring, due to the uneven cooling rate and improper control of the flow rate of the pouring molten iron, it is easy to cause shrinkage and shrinkage. Pore ​​defects, and the molten iron is easy to wash the mold, and the slag is easy to deposit in the casting, resulting in slag inclusion defects, so that the required quality cannot be achieved

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