Process for casting piston-ring blanks

Abstract

The invention discloses a process for casting piston-ring blanks. The process mainly comprises the steps of template manufacturing, sand mulling, modeling, smelting, casting, sand shakeout, blank sorting, cleaning and blank finishing; and a template used in the step of modeling is of a lantern ring structure, and a gas-ring model loop and an oil-ring model loop (the section modulus of a blank of the gas-ring model loop is close to that of the oil-ring model loop) are selected and bonded in one baseplate to carry out casting, therefore, on the basis of ensuring the stable product quality, the product yield and working efficiency of the casting process for piston-ring blanks can be significantly improved, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of manufacturing internal combustion engines and parts thereof, in particular to a casting process of piston ring blanks. Background technique [0002] The internal combustion engine is a kind of power machinery, which is a heat engine that directly converts the heat energy released into power by burning fuel inside the machine. The internal combustion engine is a mechanical device with a wide range of uses, and the piston ring is one of the most critical parts in the internal combustion engine. Piston rings mainly include gas rings and oil rings according to their functions; gas rings are mainly used to prevent gas leakage, and are generally composed of 2 to 3 rings. Gas rings can be divided into flat rings, conical rings, twisted rings, etc. according to the cross-sectional shape The oil ring has an oil return hole or an equivalent structure, which can scrape the oil from the cylinder wall. Generally, the...

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Problems solved by technology

The quality of the material depends on the quality of the piston ring blank. The manufacture of the existing piston ring blank is stacked sand casting. The mold plate used to make the sand mold has a direct sprue. According to the size of the model ring, there are 2 or 4 connected. Or 6 ingates, and then one ingate is connected to a model ring. The sand mold obtained by molding with such a mold plate, the number of blanks obtained after pouring molten iron is that one ingate can only produce one piston ring blank, The disadvantage of this casting method is that the riser accounts for a relatively large proportion, the casting process yield is low, the cost is high, and the work efficiency is low.

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