Formative technology for three-cylinder bent axle

Abstract

The invention discloses a formative technology for a three-cylinder bent axle. In the formative design process, horizontal parting of the three-cylinder bent axle is achieved through an even core combination method, chilled iron even cores are adopted as the even cores and each comprise a chilled iron inner core and a sand layer wrapping the chilled iron inner core. The formative technology has the beneficial effects that horizontal parting of the three-cylinder bent axle can be achieved by arranging the even cores, and the production technology is simplified; cooling of connecting rod positions is accelerated by placing chilled iron in the even cores, and the strength of the even cores is improved; the defects of hole shrinkage and shrinkage porosity casting of hot spots of bent axle connecting rods in the past are basically eliminated, and the rejection rate is obviously lowered.

Description

technical field [0001] The invention relates to the field of casting, in particular to a molding process of a three-cylinder crankshaft. Background technique [0002] The crankshaft is the core component of the automobile engine, and the iron mold sand-covered casting process is the most suitable casting process for the production of the crankshaft. In the design of the crankshaft casting production process, the type of the four-cylinder crankshaft basically adopts the horizontal type, and there is generally no core problem except for the structural design requirements of the crankshaft itself; while the three-cylinder crankshaft has a different structure from the four-cylinder crankshaft , the three connecting rod journals are distributed at an angle of 120 degrees, so it is difficult for us to realize the overall horizontal parting of the three-cylinder crankshaft when designing the casting process. In order to achieve the horizontal parting of the crankshaft, at the same ...

AI Technical Summary

Problems solved by technology

In the design of the crankshaft casting production process, the type of the four-cylinder crankshaft basically adopts the horizontal type, and there is generally no core problem except for the structural design requirements of the crankshaft itself; while the three-cylinder crankshaft has a different structure from the four-cylinder crankshaft , the three connecting rod journals are distributed at an angle of 120 degrees, so it is difficult for us to realize the overall horizontal parting of the three-cylinder crankshaft when designing the casting process. In order to achieve the horizontal parting of the crankshaft, at the same time, Ni The method of core combination is very common, but due to the existence of a large number of sand cores, the scrap rate of the crankshaft produced by the combination process of the core is obviously higher than that of the four-cylinder crankshaft. Casting defects such as shrinkage cavity, shrinkage porosity, and broken core appear at the connecting rod at the core

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