Alloy cast iron and manufacturing method of vane using the same
AssigneeLG Electronics Inc.
InventorJaebong PARK
Life of this patent
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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.
Claims20
An alloy cast iron comprising, by weight:
- 3.2 to 3.8% carbon (C);
- 2.0 to 2.6% silicon (Si);
- 0.5 to 1.0% manganese (Mn);
- 0.2 to 0.6% chrome (Cr);
- 0.1 to 0.6% molybdenum (Mo);
- 0.04 to 0.15% titanium(Ti);
- less than 0.3% phosphorus (P);
- less than 0.1% sulphur (S);
- and
- a remainder of iron (Fe) and foreign materials,
- wherein the alloy cast iron comprises a martensitic matrix structure, flake graphite, and 15 to 30% carbide in volume ratio.
A method for manufacturing a vane for a compressor comprising:
- a smelting step of preparing a molten metal comprising, by weight, 3.2 to 3.8% carbon (C), 2.0 to 2.6% silicon (Si), 0.5 to 1.0% manganese (Mn), 0.2 to 0.6% chrome (Cr), 0.1 to 0.6% molybdenum (Mo), 0.04 to 0.15% titanium (Ti), less than 0.3% phosphorus (P), less than 0.1% sulphur (S), and a remainder of iron (Fe) and foreign materials;
- a casting step of obtaining a semi-product comprising flake graphite and 15 to 30% by volume of carbide by injecting the molten metal in a cast and cooling the molten metal;
- a grinding step of grinding the cooled semi-product into a predetermined shape;
- and
- a heat treatment step of carrying out a heat treatment for the ground semi-product to transform into a martensitic matrix structure.
Dependencies are inferred from the claim text.