Squeeze casting method for aluminum piston of internal combustion engine

A squeeze casting and internal combustion engine technology, applied in the direction of pistons, mechanical equipment, engine components, etc., can solve the problems of loose structure of castings, low product qualification rate, high casting cost, etc., and achieve high scrap rate, low process cost and low energy consumption Effect

Active Publication Date: 2016-03-02
BINZHOU DONGHAILONG PISTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Squeeze casting method for aluminum piston of internal combustion engine
  • Squeeze casting method for aluminum piston of internal combustion engine

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Embodiment Construction

[0017] A method for casting an aluminum piston of an internal combustion engine, comprising the steps of:

[0018] (1) Design and produce such as figure 1 , figure 2 The mould, which adopts H13 or 3Cr2W8V alloy steel, consists of a moving mold body 7, a static mold body 8, an upper core 1, a lower core 4, a piston cavity 3, an injection chamber 2 and an injection head 9; The shape of the gate of the piston cavity is an arc gate 6 similar to the shape of the piston. The length L of the gate is 1 / 2 of the diameter of the cast piston, and the height h of the gate is the height of the head of the cast piston. One-half of that; use the method of changing the diameter of the injection chamber to achieve the best compressive stress of 1100MPa-1300MPa required for the solidification of the molten aluminum in the most suitable piston cavity;

[0019] (2) Install the extrusion die: press the prepared extrusion die figure 2 As shown, it is installed on a horizontal cold chamber die-...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/00F02F3/00
Inventor 刘阁辉刘毅
Owner BINZHOU DONGHAILONG PISTON
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