Squeeze casting method for aluminum piston of internal combustion engine

Abstract

The invention discloses an extruding and casting method of an internal combustion engine aluminum piston. The extruding and casting method of the internal combustion engine aluminum piston comprises the following steps of: (1) designing and manufacturing an extruding mold; (2) installing the extruding mold; (3) pouring and extruding; and (4) demoulding and forming. The extruding and casting method has the characteristics that 1. because a mold cavity pouring gate of the mold is arc, and a method for changing the diameter of an injection chamber is utilized, the resistance of pressure of an input mold cavity is low, so that the extruding force of each fractured surface of the mold cavity is consistent, the piston crystallization structures are compact and uniform, the quality of the extruded piston is good, and the piston has all quality and properties of liquid forging, for example, the normal temperature strength and fatigue strength are respectively improved by 17% and above 24% compared with those of the piston through gravity casting; 2. through the method, the energy source consumption is low, the technology cost is low, and the expense can be saved by above 45% when a ton of castings are cast compared with that by gravity casting; 3. the heat and waste gas emission is low, the environmental pollution is low, energy is saved, emission is reduced, and the biological environment is protected; and 4. because two aluminum pistons can be generated by one mold, the production efficiency is doubled compared with that through gravity casting.

Description

technical field [0001] The invention relates to a squeeze casting method for an aluminum piston of an internal combustion engine, belonging to the technical field of casting. Background technique [0002] At present, the aluminum pistons of internal combustion engines at home and abroad are generally cast by metal molds. Because the thickness of each section of the pistons varies greatly and the shape is complex, in the casting, a large gating and riser system has to be used to make the molten aluminum fill smoothly. Solidification, supplement casting shrinkage. Therefore, the gating and riser system is an important condition to ensure the quality of castings, but the gravity casting piston has two major defects: First, the weight ratio of castings and gating and riser systems reaches an average of 1:1-1:2, and the yield rate of molten aluminum is only 33%-50%, that is, in the casting, it is necessary to smelt aluminum metal that is more than twice the weight of the casting...

AI Technical Summary

Problems solved by technology

Therefore, the gating and riser system is an important condition to ensure the quality of castings, but the gravity casting piston has two major defects: First, the weight ratio of castings and gating and riser systems reaches an average of 1:1-1:2, and the yield rate of molten aluminum is only 33%-50%, that is, in the casting, it is necessary to smelt aluminum metal that is more than twice the weight of the casting, so it consumes a lot of energy, material resources, manpower and aluminum materials are burned, resulting in high casting costs and great environmental pollution; Second, due to the loose structure and low strength of gravity casting castings, the product qualification rate is low

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