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Alloy cast iron and manufacturing method of vane using the same

a manufacturing method and technology of alloy cast iron, which are applied in the direction of machines/engines, liquid fuel engines, heat treatment apparatus, etc., can solve the problems of high price, low productivity, and difficulty in processing operation through forging, so as to reduce manufacturing costs and increase productivity.

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

This patent describes a new type of alloy cast iron that can improve productivity and reduce manufacturing costs while still satisfying strength and abrasion resistance requirements for a vane. By mixing elements in a specific ratio and combining a martensitic matrix structure, flake graphite structure, and carbide, the alloy cast iron can improve both abrasion resistance and tensile strength. This allows for the manufacturing of low-cost compressor vanes without the need for expensive rare earth elements. Additionally, the alloy cast iron can be manufactured through casting instead of forging, which decreases post-treatments and increases productivity while reducing raw material costs.

Problems solved by technology

However, the vanes excessively contain Gr, W, Mo, V, Co and the like, which are high-priced rare earth metals and are machined into the predetermined shapes through forging, thereby having low productivity and high prices.
In particular, the vane has a high hardness for an increase in the abrasion resistance, but this makes it difficult to perform the processing operation through the forging.

Method used

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  • Alloy cast iron and manufacturing method of vane using the same
  • Alloy cast iron and manufacturing method of vane using the same
  • Alloy cast iron and manufacturing method of vane using the same

Examples

Experimental program
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Effect test

example 1

[0092]Example 1 was manufactured through the following processes.

[0093]A raw material, which consists of, by weight, the following elements, namely, C: 3.4%, Si: 2.2%, Mn: 0.7%, Cr: 0.4%, Mo: 0.4%, V: 0.3%, B: 0.06%, Ti: 0.1%, Nb: 0.25%, Cu: 0.25%, P<0.3%, S<0.1%, and the rest percentage of Fe, is prepared. The prepared raw material is put into a middle frequency induction furnace, whose temperature is increased until the raw material is completely melted such that the alloy cast iron is smelted into a molten metal. The molten metal of the alloy cast iron is taken out of the furnace at temperature of 1525° C.

[0094]The molten metal of the alloy cast iron which was taken out of the furnace after smelted, is inoculated by injecting an inoculant. Here, the inoculant is a barium silicon ferroalloy, namely, FeSi72Ba2, and its content is 0.7% of the mass of the molten metal.

[0095]The molten metal of the alloy cast iron, which was inoculated at the previous step, is casted through a shell m...

example 2

[0099]A raw material, which consists of, by weight, the following elements, namely, C:3.2%, Si:2.0%, Mn:0.5%, Cr:0.2%, Mo:0.1%, Ti:0.04%, P<0.3%, S<0.1% and the rest percentage of Fe, is melted into a molten metal. The molten metal is then taken out at temperature of 1500° C. FeSi72Ba2 is added as an inoculant into the molten metal by 0.4% of the mass of the molten metal. Afterwards, the inoculated molten metal is casted through the shell mold process or investment mold process, thereby obtaining a semiprocessed vane in which 15% carbide is contained in volume ratio.

[0100]After grinding the semiprocessed vane, the ground semiprocessed vane is heated up to 860° C., maintained at the same temperature for 0.5 hours, put into oil of 10° C. to be cooled down to room temperature, thereby being transformed into a martensitic structure. The semiprocessed vane with the martensitic structure is heated up to 180° C., maintained at the same temperature for 0.5 hours, and air-cooled down to room...

example 3

[0101]A raw material, which consists of, by weight of, the following elements, namely, C: 3.8%, Si: 2.6%, Mn: 1.0%, Cr: 0.6%, Mo: 0.6%, V: 0.5%, B: 0.1%, Ti: 0.15%, Nb: 0.5%, Cu: 0.5%, P<0.3%, S<0.1% and the rest percentage of Fe, is melted into a molten metal. The molten metal is then taken out at temperature of 1550° C. FeSi72Ba2 is added as an inoculant by 1.0% of the mass of the molten metal. Afterwards, the inoculated molten metal is casted through the shell mold process or investment mold process, to contain a carbide corresponding to 30% of the vane in volume ratio, thereby being ground into a desired shape.

[0102]The ground vane is heated up to 950° C., and maintained for 1.5 hours. The heated vane is put into oil of 30° C. to be cooled down to room temperature, thereby obtaining a vane which contains a martensitic matrix structure, carbide and flake graphite. The obtained vane is heated up to 220° C., maintained for 1.5 hours and then air-cooled down to room temperature, the...

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Abstract

An alloy cast iron, a method of manufacturing a vane for a rotary compressor, and a vane for a rotary compressor using the alloy cast iron are disclosed. The alloy cast iron according to one exemplary embodiment includes, by weight, 3.2 to 3.8% carbon, 2.0 to 2.6% silicon, 0.5 to 1.0% Manganese, 0.2 to 0.6% chrome, 0.1 to 0.6% molybdenum, 0.04 to 0.15% titanium, less than 0.3% phosphorus, less than 0.1% sulphur, and the rest percentage of iron and foreign materials, wherein the alloy cast iron includes a martensitic matrix structure, flake graphite, and 15 to 30% carbide in volume ratio.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]Pursuant to 35 U.S.C. §119(a), this application claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2011-0118378, filed on Nov. 14, 2011, the contents of which is incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This specification relates to an alloy cast iron and a manufacturing method of a vane for a rotary compressor using the same.[0004]2. Background of the Invention[0005]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 cylinde...

Claims

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Application Information

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IPC IPC(8): F01C21/08C22C37/06C21D5/00
CPCC21D5/00C22C37/06F01C21/0809C22C33/08C22C37/10F04C18/356C21D1/50F05C2201/0439C21D2211/004C21D2211/006C21D2211/008C21D1/18F04C2230/21C22C37/00
Inventor PARK, JAEBONG
Owner LG ELECTRONICS INC
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