Cast iron ring carrier used for aluminum piston and manufacturing method thereof

Abstract

The invention discloses a cast iron ring carrier used for an aluminum piston and a manufacturing method thereof. The cast iron ring carrier comprises a ring body and a convex support table which is arranged on the excircle of the ring body and integrally molded with the ring body, wherein uniformly distributed internal teeth are arranged on the inner circle of the ring body; and the end face of the internal teeth is one of triangle, isosceles trapezoid, rectangle or dovetail in smooth transition at the closed angle. Precious nickel is not used in the components of the ring carrier, and other wear-resistant metal materials are added. The blank of the ring carrier is sand cast by an automatic molding machine in stack molding, and the shot-blasting treatment is carried out. The ring carrier has unique structure and strong bonding force with an aluminum substrate of the aluminum piston, so that the deformation and casting-off of the aluminum piston at high temperature are prevented, and the bonding force of the ring carrier and aluminum can be improved. The ring carrier adopts preferred alloy ratio and does not contain precious nickel, so that the production cost is lowered. The casting and machining stress of the manufacturing method is smaller than that of the centrifugal casting, and the high-temperature volume stability of the piston can be improved.

Description

technical field [0001] The invention relates to an insert ring for a piston, in particular to the structure, components and manufacturing method of an ordinary cast iron insert ring for an aluminum piston. Background technique [0002] With the increasingly serious situation of energy saving and emission reduction at home and abroad, reducing the weight of aluminum pistons is one of the ways to reduce engine emissions and fuel consumption. In order to increase the strength of the aluminum piston and improve the life of the piston, it is generally necessary to add a high-strength insert to the head of the piston. At present, high-nickel austenite inserts are mostly used in the industry, and the coefficient of linear expansion of this insert at 20-200°C is ≥18×10 -6 , close to the aluminum alloy, so the high-nickel austenitic insert is a better insert for the aluminum piston. However, because a large amount of nickel must be added to this kind of setting ring, the raw mater...

AI Technical Summary

Problems solved by technology

However, it is well known that the linear expansion coefficient of alloy cast iron is 12×10 -6 About, compared with the linear expansion coefficient of aluminum alloy 19~21×10 -6 Low, and because the insert ring is a circular structure, it affects the bonding force between the insert ring and the aluminum piston body, so that the insert ring cannot be firmly embedded on the aluminum piston body, and after a period of use, it may cause deformation of the insert ring Even falling off the aluminum piston body

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