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Alloy cast iron and manufacturing method of rolling piston using the same

a manufacturing method and technology of alloy cast iron, which are applied in the direction of liquid fuel engines, furnaces, heat treatment apparatus, etc., can solve the problems of increased manufacturing costs, leakage of refrigerant, and abrasion of compressors for a long time, and achieves the effects of enhancing cutting function, reducing manufacturing costs, and ensuring the quality of the produ

Inactive Publication Date: 2013-05-16
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for manufacturing a rolling piston using alloy cast iron that is cheaper than conventional methods. By minimizing or excluding the use of expensive materials, such as Ni, Cr, and Mo, the rolling piston can be made more affordable. Additionally, adding a proper amount of Cu to the cast iron can improve its cutting function, tensile strength, and abrasion resistance. Overall, this invention allows for the manufacturing of a high-quality rolling piston at a lower cost.

Problems solved by technology

However, the conventional rolling piston has the following problems.
Firstly, as the conventional rolling piston is formed of gray cast iron having the hardness (HRC) of 30˜40, it may abrade when the compressor is driven for a long time.
This may cause leakage of a refrigerant.
However, the high cost of Mo, Ni, Cr, etc. corresponding to 40% the material cost of the alloy cast iron, may cause the manufacturing costs to be increased.

Method used

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  • Alloy cast iron and manufacturing method of rolling piston using the same
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  • Alloy cast iron and manufacturing method of rolling piston using the same

Examples

Experimental program
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Effect test

embodiment 1

[0069]The hardness of the rolling piston after casting was high as 98 HRB. However, the hardness after the thermal processing was 49 HRC and the tensile strength was 293 MPa. Referring to FIG. 3A, graphite precipitated in the structure of the Embodiment 1 is about 80% A-type graphite in which flake graphite is smoothly curved and is uniformly distributed. Generally, A-type flake graphite is the most excellent among A˜E type graphite. Therefore, it can be seen that the rolling piston has an excellent physical property in the Embodiment 1.

[0070]Referring to FIG. 3B, it can be seen that the content of steadite is about 3%. Referring to FIG. 3C, it can be seen that the matrix structure of the Embodiment 1 is Martensite.

[0071]From the results, it can be seen that the rolling piston of the Embodiment 1 has the hardness and abrasion-resistance more excellent than those of the conventional rolling piston formed of alloy cast iron and having the hardness of 30˜40. Further, the rolling piston...

embodiment 2

[0072]The hardness after casting was high as 98 HRB. However, the hardness after the thermal processing was 50 HRC and the tensile strength was 298 MPa. Referring to FIG. 4A, graphite precipitated in the structure of the Embodiment 2 is about 90% A-type graphite in which flake graphite is smoothly curved and is uniformly distributed. Therefore, it can be seen that the rolling piston has also an excellent physical property in the Embodiment 2.

[0073]Referring to FIG. 4B, it can be seen that the content of steadite is about 3.5%. Referring to FIG. 4C, it can be seen that the matrix structure of the Embodiment 2 is Martensite.

[0074]It can be also seen that the rolling piston of the Embodiment 2 has the hardness and abrasion-resistance more excellent than those of the conventional rolling piston formed of alloy cast iron. Further, the rolling piston of the present invention has a similar function to a rolling piston containing Ni, Mo and Cr.

embodiment 3

[0075]The hardness after casting was high as 100 HRB. However, the hardness after the thermal processing was 51 HRC and the tensile strength was 300 MPa. Referring to FIG. 5A, graphite precipitated in the structure of the Embodiment 3 is about 95% A-type graphite in which flake graphite is smoothly curved and is uniformly distributed. Therefore, it can be seen that the rolling piston has also an excellent physical property in the Embodiment 3.

[0076]Referring to FIG. 5B, it can be seen that the content of steadite is about 4%. Referring to FIG. 5C, it can be seen that the matrix structure of the Embodiment 3 is Martensite.

[0077]It can be also seen that the rolling piston of the Embodiment 3 has the hardness and abrasion-resistance more excellent than those of the conventional rolling piston formed of alloy cast iron. Further, the rolling piston of the present invention has a similar function to a rolling piston containing Ni, Mo and Cr.

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Abstract

An alloy cast iron, and a method of manufacturing a rolling piston for a rotary compressor includes, by weight, 3.0˜3.5% carbon (C), 2.2˜2.4% silicon (Si), 0.5˜1.0% manganese (Mn), 0.1˜0.3% phosphorus (P), 0.06˜0.08% sulfur (S), 0.7˜1.0% chrome (Cr), 0.6˜1.0% copper (Cu), and a residue formed of Fe and inevitable impurities, wherein 3˜8 vol % steadite structure is formed.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims benefit under 35 USC 119 to Korean Application Number 10-2011-0118384, filed Nov. 14, 2011 and Korean Application Number 10-2012-0013480, filed Feb. 9, 2012. The contents of these applications are expressly incorporated by reference in their entireties.TECHNICAL FIELD[0002]The present invention relates to alloy cast iron, and a method of manufacturing a rolling piston for a rotary compressor using the same.BACKGROUND ART[0003]Generally, a compressor includes a driving motor for generating a driving force at an inner space of a shell, and a compression unit coupled to the driving motor and compressing a refrigerant. The compressor may be categorized into various types according to a refrigerant compression method. For instance, in case of a rotary compressor, the compression unit includes a cylinder for forming a compression space, a vane for dividing the compression space of the cylinder into a suction chamber and a...

Claims

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Application Information

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IPC IPC(8): C22C37/06C21D9/00
CPCC21D9/0068C22C37/06C22C33/08C22C37/10F05C2201/90F01C21/08F04C18/356F04C2230/21F04C2230/40C21D5/00Y02P10/20C22C37/00
Inventor PARK, JAEBONG
Owner LG ELECTRONICS INC
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