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Preparation method of nodular cast iron rotor for central air-conditioning screw compressor with high spheroidization rate

A screw compressor and central air-conditioning technology, applied in the direction of mechanical equipment, improvement of process efficiency, furnace type, etc., can solve the problems of complex preparation process, collision, tooth surface variability, etc., and achieve good mechanical properties, simple process, and easy Achieved effect

Active Publication Date: 2017-02-22
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the forged steel rotor has the disadvantages of complex preparation process, low material utilization rate, and high cost, and the tooth surface of the processed rotor is variable, so that the female and male rotors collide during the rotation process, resulting in noise and vibration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment die sheet is a large-scale ductile iron rotor with a maximum diameter of 216 millimeters and a finished product weight of 131 kilograms.

[0023] 1) Ingredients: Weigh the following ingredients in terms of mass percentage: Q10 virgin iron 55%, returned iron 15%, scrap steel 26%, 65# ferromanganese 0.50%; 99% copper 0.20%, nodulizer 1.20%, 75# Ferrosilicon inoculant 1.00%, long-acting rare earth inoculant 1.10%.

[0024] 2) Smelting: Put the above-mentioned pig iron, returned iron, and steel scrap into the furnace to melt, and put in ferromanganese when the temperature of the molten iron reaches 1420°C. After putting in the ferromanganese for 2 minutes, add perlite to make slag twice, remove the slag, and control the temperature of the molten iron to 1380°C Out of the molten iron, the molten iron smelting time does not exceed 2 hours.

[0025] 3) Spheroidization + inoculation: nodulizer + 75# ferrosilicon inoculant + 0.6% long-acting rare earth in...

Embodiment 2

[0034] The module of this embodiment is a medium-sized ductile iron rotor with a maximum diameter of 181 millimeters and a finished product weight of 78 kilograms.

[0035] 1) Ingredients: Weigh the following ingredients in terms of mass percentage: Q10 virgin iron 60%, returned iron 10%, scrap steel 25%, 65# ferromanganese 0.60%; 99% copper 0.40%, nodulizer 1.5%, 75# Ferrosilicon inoculant 1.5%, long-acting rare earth inoculant 1.0%.

[0036] 2) Smelting: put the above-mentioned pig iron, returned iron, and steel scrap into the furnace for melting, and put in ferromanganese when the temperature of the molten iron reaches 1450°C. After ferromanganese is put in for 3 minutes, add perlite to make slag twice, remove the slag, and control the temperature of the molten iron to 1420°C Out of the molten iron, the molten iron smelting time does not exceed 2 hours.

[0037] 3) Spheroidization + inoculation: nodulizer + 75# ferrosilicon inoculant + 0.5% long-acting rare earth inoculant...

Embodiment 3

[0046] The module of this embodiment is a small ductile iron rotor with a maximum diameter of 120 millimeters and a finished product weight of 48 kilograms.

[0047] 1) Ingredients: Weigh the following ingredients in terms of mass percentage: Q10 virgin iron 58.5%, returned iron 14%, scrap steel 23%, 65# ferromanganese 0.55%; 99% copper 0.30%, nodulizer 1.45%, 75# Ferrosilicon inoculant 1.3%, long-acting rare earth inoculant 0.9%.

[0048] 2) Smelting: Put the above-mentioned pig iron, returned iron, and scrap steel into the furnace for melting, and put in ferromanganese when the temperature of molten iron reaches 1440°C. After ferromanganese is put in for 2.5 minutes, add perlite to make slag twice, remove the slag, and control the temperature of molten iron to 1400°C Out of the molten iron, the molten iron smelting time does not exceed 2 hours.

[0049] 3) Spheroidization + inoculation: nodulizer + 75# ferrosilicon inoculant + 0.4% long-acting rare earth inoculant is placed...

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Abstract

The invention discloses a preparation method of a high-nodularity nodular cast iron rotor of a central air-conditioner screw compressor. The preparation method comprises the following steps: (1) preparing materials; (2) smelting; (3) nodulizing and breeding; (4) casting; (5) annealing; (6) heating and keeping the temperature; (7) austenitizing; (8) normalizing; and (9) tempering. The preparation method disclosed by the invention is simple in process and easy to implement; a nodular cast iron rotor material prepared by the preparation method is larger than 600MPa in minimum tensile strength, larger than 370MPa in minimum yield strength, higher than 4% in minimum elongation rate and 180HB to 270HB in Brinell hardness; the hardness difference of any rotor is not larger than 30HB; the nodular cast iron rotor is good in various mechanical properties, can satisfy the requirements of machining, is free from deformation after being machined and is suitable for preparing a compressor rotor of a wet type screw compressor of a central air conditioner.

Description

technical field [0001] The invention relates to a method for preparing a nodular cast iron rotor, in particular to a method for preparing a nodular cast iron rotor with high spheroidization rate for a central air-conditioning wet screw compressor. Background technique [0002] The wet screw compressor of the central air conditioner is composed of a pair of parallel, intermeshed female and male screws. Spray lubricating oil or other liquids into the working chamber to cool the compressed gas, improve the seal, and lubricate the male and female rotors and bearings to realize self-transmission, and then filter the oil or other liquid impurities in the compressed air through a high-precision filter Remove to get higher quality compressed gas. Wet screw compressors are simple in structure, easy to maintain, stable and reliable, and are also commonly used in aerodynamic engineering. [0003] In the wet screw compressor, the most important thing is a pair of rotors that mesh with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/16C21D5/00C21D9/00C21C1/10
CPCC21C1/10C21D5/00C21D9/00F04C18/082F04C18/165F04C2230/40F04C2240/20Y02P10/20
Inventor 王振生杨双双彭真宋力
Owner HUNAN UNIV OF SCI & TECH
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