Engine block casting method with integrated high-pressure oil pump and cold iron core support for casting

Abstract

The invention discloses a method for casting an engine cylinder block with an integrated high-pressure oil pump and a cold iron core support for casting. The casting method includes the following steps: installing and positioning the cold iron core support on the water jacket core of the cylinder block; Place the supported cylinder body water jacket core on the corresponding position on the outer mold of the sand mold and lock it; after adjusting the composition of the cast iron molten iron, inject the molten iron from the sprue cup of the sand box into the sand at the set pouring temperature and according to the set pouring speed. In the cavity of the core; cool the casting at room temperature, open the sand box and take out the casting at the set sand falling time; process the oil pump piston assembly hole on the casting; install it in the machined oil pump piston assembly hole Oil pump piston assembly. In the engine block casting method with an integrated high-pressure oil pump and the cold iron support for casting of the present invention, the cold iron support can be fused when the molten iron is solidified, and can absorb heat so as to eliminate shrinkage defects in the casting.

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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