Casting method of engine cylinder block integrated with high-pressure oil pump and cold iron core support for casting

Abstract

The invention discloses a casting method of an engine cylinder block integrated with a high-pressure oil pump and a cold iron core support for casting. The casting method comprises the following stepsthat the cold iron core support is installed and positioned on a cylinder block water jacket core; the cylinder block water jacket core loaded with the cold iron core support is placed at the corresponding position of a sand mold outer mold and locked; after components of casting molten iron are adjusted, the molten iron is injected into a cavity of a sand core from a pouring cup of a sand box atthe set pouring temperature according to the set pouring speed; a casting is cooled at the room temperature, and the sand box is opened and the casting is taken out at the set shakeout time; an oil pump piston assembly hole is machined in the casting; and an oil pump piston assembly is installed in the machined oil pump piston assembly hole. According to the casting method of the engine cylinderblock integrated with the high-pressure oil pump and the cold iron core support for casting, the cold iron core support can be fused when the molten iron is solidified, heat can be absorbed, and therefore the shrinkage porosity defect in the casting can be eliminated.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a casting method for an engine cylinder block integrated with a high-pressure oil pump and a cold iron core support for casting. Background technique [0002] At present, the mass-produced diesel engine high-pressure oil pumps on the market basically adopt a split structure, and the cylinder body is produced and processed by casting technology. The pump body of the high-pressure oil pump is manufactured separately and connected to the cylinder body by bolts. The cavity between the outer wall of the cylinder and the pump body of the high-pressure oil pump forms an inner cavity. In order to ensure the sealing performance of the high-pressure oil pump during operation, it is also necessary to set up a multi-layer sealing gasket between the high-pressure oil pump and the cylinder to play a sealing role. [0003] Since the internal oil pressure of the high-pressure oil pump is rela...

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Problems solved by technology

[0005] Although the design of the high-pressure oil pump integrated with the cylinder block has a simple structure, easy disassembly and assembly, lower manufacturing and maintenance costs, and no risk of oil leakage when the high-pressure oil pump is used, the cylinder block blank is prone to shrinkage defects at the high-pressure oil pump during casting

Since it is difficult to manufacture the sand core at the high-pressure oil pump integrated in the cylinder block, the high-pressure oil pump hole needs to be processed, so the heat joint here is relatively large, such as figure 1 As shown in , it is very easy to produce shrinkage porosity defects during the solidification process

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