Process for solving air holes and shrinkage porosity of top partition plate of double-flow-channel volute

Abstract

The invention discloses a process for solving air holes and shrinkage porosity of a top partition plate of a double-flow-channel volute. The process comprises the following steps of firstly, process design, wherein a parting scheme is determined according to a product structure, the process is designed according to the parting scheme, casting simulation analysis is carried out, the position where defects are most likely to appear at the top of the double-flow-channel volute is found out according to the result, and generally, defects are most likely to appear at the top of a vortex head; secondly, scheme determining, wherein a riser neck process boss is designed at the found defect position, a riser is designed at the upper part of the riser neck boss, a heating block is additionally arranged on the outer portion of the riser, and feeding and exhausting of the riser to the defect position of the product are delayed; and thirdly, mold design. The process design is a shell mold process, and a sand core comprises an upper shell, a lower shell, an inner supplementing sand core, a large flow channel core, a small flow channel core, an air chamber core combination, a pouring cup and an exhaust core. According to the process, the position defect of the top partition plate of a double-flow-channel turbocharging shell is effectively overcome, the bad defects of cold shut, air holes and shrinkage porosity are prevented from being generated in the casting process, the process yield is increased, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a process for solving air holes and shrinkage porosity of a partition plate at the top of a double-channel volute. Background technique [0002] Compared with the conventional single-channel volute, the casting production process layout of the double-channel volute is more complicated. The most common defects in the casting production process are the pores and shrinkage defects of the channel separator. Due to the small size of the double-runner volute partition, the end R1.5, and the thickness of 2.5mm, it is very easy to produce bad defects such as shrinkage and porosity of the cold trap during the casting process, which is generally difficult to solve. The problem of the runner partition in the normal production process accounts for 78% of the total scrap rate. Contents of the invention [0003] The purpose of the present invention is to overcome the above disad...

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Problems solved by technology

[0002] Compared with the conventional single-channel volute, the casting production process layout of the double-channel volute is more complicated, and the most defects in the casting production process are the pores and shrinkage defects of the channel separator.

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