Casting Method of Ductile Iron Steering Knuckle

Abstract

The invention discloses a casting method of a steering knuckle of nodular cast iron. The casting method comprises a mold manufacturing step, a sand mold manufacturing step and a pouring molding step, wherein the steering knuckle is vertically arranged, a thick part of a steering knuckle casting is arranged at the upper part, a thin-walled part of the steering knuckle casting is arranged at the lower part; a pouring system of the steering knuckle casting is divided into a pouring cup, a cross pouring gate and a straight pouring gate, the cross pouring gate is connected to the lower part of the pouring cup, the straight pouring gate is connected to the lower part of the cross pouring gate, and a scum riser is arranged at the bottom end of the straight pouring gate; the side wall of the straight pouring gate is connected with a first inner pouring gate, a second inner pouring gate and a third inner pouring gate from top to bottom; the steering knuckle casting is further provided with a hot riser, a cold riser and exhausting pieces; the sectional area ratio of each component of the casting is that F(straight pouring gate):F(cross pouring gate):F(inner pouring gates) is equal to 1:(1.2-1.4):(1.35-1.5); the casting is obtained by controlling the pouring temperature at 1370-1410 DEG C and carrying out pouring for 5-10 seconds. The casting method has the advantages that pouring speed is high, the defects such as shrinkage porosity, shrinkage cavity and the like cannot easily occur, and the casting is high in production efficiency, low in rejection rate and excellent in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of sand mold gravity casting technology, and in particular relates to a casting method of a nodular cast iron steering knuckle. Background technique [0002] The steering knuckle is a very important part in the automobile control system. Its structural shape is relatively complex and its wall thickness varies greatly. It can be said that it is the part with the most complex shape and the largest wall thickness variation in the automobile control system. Therefore, the market demand is relatively large, and the mass production of the production line is adopted, which brings great challenges to the casting process of the parts. [0003] At present, the vast majority of steering knuckles use the casting process of horizontal pouring in actual production. There are some disadvantages in the production of this process. First, the production efficiency is relatively low. Generally, the pouring speed of molten iron...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies of the prior art, the present invention provides a nodular cast iron steering knuckle with fast pouring speed, less prone to shrinkage porosity, shrinkage cavities and other casting defects, high production efficiency, low casting rejection rate and better mechanical properties. casting method

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