Extrusion casting manufacture method of piston with reinforced pseudo-alloy circular groove

A manufacturing method, squeeze casting technology, applied to pistons, piston rings, cylindrical pistons, etc., can solve the problems of poor microstructure density, short service life of pistons, heavy weight of pistons, etc., and achieve dense internal structure of materials and reliable use Enhanced performance and improved mechanical properties

Inactive Publication Date: 2013-04-17
北方材料科学与工程研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using conventional metal gravity casting and sand casting aluminum pistons, it is easy to produce casting defects such as pores, shrinkage porosity, cracks, and slag inclusions, the microstructure density is poor, and the mechanical properties cannot meet the requirements of use. Not only that, conventional casting methods, production efficiency low, labor intensive
[0003] Existing pistons for diesel engines at home and abroad are usually reinforced with high-nickel cast iron inserts in the first ring groove, and the thick and large parts are usually equipped with cooling oil chambers to cool the

Method used

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  • Extrusion casting manufacture method of piston with reinforced pseudo-alloy circular groove
  • Extrusion casting manufacture method of piston with reinforced pseudo-alloy circular groove
  • Extrusion casting manufacture method of piston with reinforced pseudo-alloy circular groove

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation process of the squeeze casting manufacturing method of the pseudo-alloy reinforced ring groove piston is as follows:

[0052] ①Preparation of aluminum alloy for piston, the composition and mass percentage of the alloy are: Si: 11.0%; Mg: 0.6%; Cu: 2.6%; Ni: 1.8%; Fe: 0.1%; Ti: 0.1%; Mn: 0.01% ; Zn: 0.01%; the total amount of Cr, Pb, Ca and Sn impurity elements does not exceed 0.5%, and the rest is Al;

[0053] ②Configure pseudo-alloy composition, the composition and mass percentage of pseudo-alloy powder particles are: Cr: 15%; Ni: 11%; Si: 1%; Mn: 1%; the total amount of C, O, S and P impurity elements is not More than 1.0%, the rest is Fe;

[0054] ③ To make the pseudo-alloy prefabricated part, the average size of the pseudo-alloy powder particles will be less than 80 μm, and after the particles are evenly mixed, the porosity of the pseudo-alloy inlay prefabricated part 1 is controlled to 40%, and the pseudo-alloy inlaid prefabricated part is formed a...

Embodiment 2

[0063] ①Preparation of aluminum alloy for piston, the composition and mass percentage of the alloy are: Si: 12.0%; Mg: 1.0%; Cu: 3.2%; Ni: 2.2%; Fe: 0.2%; Ti: 0.15%; Mn: 0.1% ; Zn: 0.1%; the total amount of Cr, Pb, Ca and Sn impurity elements does not exceed 0.5%, and the rest is Al;

[0064] ②Configure pseudo-alloy composition, the composition and mass percentage of pseudo-alloy powder particles are: Cr: 20%; Ni: 15%; Si: 3%; Mn: 1.5%; the total amount of C, O, S and P impurity elements is not More than 1.0%, the rest is Fe;

[0065] ③ To make the pseudo-alloy prefabricated part, the average size of the pseudo-alloy powder particles will be less than 80 μm. After the particles are evenly mixed, the porosity of the pseudo-alloy insert preform 1 is controlled to 45%. After mold pressing and sintering, the pseudo-alloy insert preform is formed. 1.

[0066] ④Smelting treatment, put the prepared aluminum alloy for piston into the melting furnace for melting, after melting, refin...

Embodiment 3

[0074] ①Preparation of aluminum alloy for piston, the composition and mass percentage of the alloy are: Si: 13.0%; Mg: 1.2; Cu: 4.0%; Ni: 2.8%; Fe: 0.3%; Ti: 0.2%; Mn: 0.2%; Zn: 0.2%; the total amount of Cr, Pb, Ca and Sn impurity elements does not exceed 0.5%, and the rest is Al;

[0075] ②Configure pseudo-alloy composition, the composition and mass percentage of pseudo-alloy powder particles are: Cr: 30%; Ni: 18%; Si: 5%; Mn: 2%; the total amount of C, O, S and P impurity elements is not More than 1.0%, the rest is Fe;

[0076] ③ To make the pseudo-alloy prefabricated part, the average size of the pseudo-alloy powder particles will be less than 80 μm. After the particles are evenly mixed, the porosity of the pseudo-alloy insert preform 1 is controlled to 50%. After mold pressing and sintering, the pseudo-alloy insert preform is formed. 1.

[0077] ④Smelting treatment, put the prepared aluminum alloy for piston into the melting furnace for melting, after melting, refine, mo...

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Abstract

The invention relates to an extrusion casting manufacture method of a piston with a reinforced pseudo-alloy circular groove. The extrusion casting manufacture method is characterized by including the preparation process steps: firstly, preparing aluminum alloy for the piston; secondly, preparing pseudo-alloy components; thirdly, manufacturing a pseudo-alloy preformed part, uniformly mixing pseudo-alloy powder particles, and pressing and sintering the mixed particles via a die so that a pseudo-alloy insert ring preformed part is formed; fourthly, melting, namely, placing the prepared aluminum alloy for the piston into a melting furnace for melting, and refining, deteriorating, homogenizing and refining alloy liquid after melting; fifthly, preheating the pseudo-alloy preformed part; seventhly, performing extrusion casting; eighthly, performing aging heat treatment for a piston blank and performing air cooling after the piston blank taps off; and ninthly, machining and performing surface treatment for the piston blank so that an aluminum piston finished product is obtained. Compared with the prior art, the extrusion casting manufacture method has the advantages that the piston with the reinforced circular groove is good in wear resistance, compact in material internal texture and remarkably improved in mechanical performance, and the method is high in process efficiency and low in manufacture cost.

Description

technical field [0001] The invention relates to a piston casting method, in particular to a method for manufacturing a pseudo-alloy reinforced ring groove piston used in the field of high-strength diesel engines with severe engine working conditions. Background technique [0002] At present, ZL108 and ZL109 cast aluminum alloys are generally used in automobile engine pistons in my country. The mechanical properties of the materials are tensile strength (Rm) 220MPa-240MPa, elongation (A) 0.5%-1.0%, and high-temperature (300℃) tensile strength 60MPa ~80MPa. High-strength diesel engines are developing towards high power and high load, and aluminum pistons are important reciprocating components of internal combustion engines, and their performance directly affects the performance and reliability of high-strength diesel engines. The aluminum piston usually has a cooling oil chamber in the thick part to cool the piston, and the first ring groove of the piston is equipped with a hi...

Claims

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Application Information

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IPC IPC(8): B22D19/16B22D18/02F16J1/00F16J1/01F16J9/26C22C21/04C22C38/40C22C38/58
Inventor 朱秀荣彭银江周灵展张广明高明灯侯林冲费良军徐英任静
Owner 北方材料科学与工程研究院有限公司
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