Preparation method of hypereutectic al-si alloy automobile engine cylinder liner
An engine cylinder and hypereutectic technology, which is applied in the field of hypereutectic Al-Si alloy automobile engine cylinder liner preparation, can solve the problems of poor bonding and short service life of cast iron cylinder liners, and achieve small processing volume and wear resistance Good, high production efficiency effect
Active Publication Date: 2017-05-03
HARBIN INST OF TECH
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[0003] The purpose of the present invention is to solve the defects in the above-mentioned prior art, and provide a kind of cylinder liner preparation for a hypereutectic Al-Si alloy automobile that can solve the problems of poor bonding and short service life of the cast iron cylinder liner and reduce the weight of the cylinder body at the same time. method
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[0023] Step 1: semi-continuous casting of hypereutectic Al-Si alloy ingot: After refining, degassing and standing still, adding preheated Al-P-Cu modifier for stirring, standing for 30-50 minutes and using Semi-continuous casting, producing large-size ingots with a diameter of 310-320mm; the composition of the melt is as follows: Si: 18-20%, Cu: 4-5.5%, Fe: 0.5-0.8%, Mg: 0.5- 0.7%, Mn<0.3%, Zn<0.1%, the rest is Al;
[0024] Specifically, the Si grain size of the hypereutectic Al-Si alloy billet prepared by this method is 30-40 microns, and the distribution is uniform, which is beneficial to improving the mechanical properties and wear properties of the final prepared engine cylinder liner. The large-size ingot can ensure the extrusion ratio of subsequent pipes, which is beneficial to densification and Si grain crushing, and further improves performance; high-purity dry nitrogen is used for refining and degassing, the refining temperature is 730±5°C, the refining time is 10 min...
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Abstract
The invention provides a hypereutectic Al-Si alloy automobile engine cylinder sleeve manufacturing method, which comprises the steps: after a melt is subjected to refinement, deaeration and standing, a preheating Al-P-Cu alterant is added into the melt and stirred, standing is carried out for 30-50 minutes, and then semicontinuous casting is adopted for producing a cast ingot; the cast ingot is processed into a tubular extrusion blank and is placed into a furnace for preheating, wherein the preheating temperature of the cast ingot is 420-460 DEG C, and the thermal insulation of the cast ingot is carried out for 3 hours; a backward extrusion method is adopted, the preheated cast ingot is extruded on a 3200t hydraulic press, wherein the extrusion speed is 0.1-0.2 mm / s, and the extrusion temperature is 430-460 DEG C; the hypereutectic Al-Si alloy pipe which is formed by extrusion is placed into a quenching charging basket, and then is placed into a furnace to be heated along with the furnace, wherein the furnace temperature is 100-200 DEG C, and the pipe is gradually heated until the pipe temperature is 420 DEG C, wherein the heating speed is not higher than 5 DEG C / min; and solution heat treatment and aging heat treatment are carried out in sequence. The hypereutectic Al-Si alloy automobile engine cylinder sleeve manufacturing method has the advantages that the production efficiency is high; the processing volume is small; and the mechanical performance of the produced engine cylinder sleeve is high, and the abrasion performance of the produced engine cylinder sleeve is good.
Description
technical field [0001] The invention relates to the technical field of automobile equipment preparation, in particular to a method for preparing a hypereutectic Al-Si alloy automobile engine cylinder liner. Background technique [0002] At present, the method of inlaying cylinder liners in aluminum alloy cylinder blocks is mostly used, while the traditional cylinder liner materials are mostly cast steel and cast iron. The disadvantages are high density, poor heat dissipation, high friction coefficient, cast iron cylinder liner and aluminum alloy cylinder The body melting point and thermal expansion coefficient are quite different, the combination of the cylinder block and the cylinder liner is poor, and stress will be generated at the same time. Contents of the invention [0003] The purpose of the present invention is to solve the defects in the above-mentioned prior art, and provide a kind of cylinder liner preparation for a hypereutectic Al-Si alloy automobile that can ...
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IPC IPC(8): C22C21/02C22F1/043
Inventor 宁志良肖阳曹福洋孙剑飞黄永江
Owner HARBIN INST OF TECH