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Manufacturing method of 2.8 MW wind power hub

A manufacturing method and hub technology, applied in the field of metallurgy, can solve problems such as loose structure and graphite distortion of thick and large cross-section wind power hubs, and achieve the effects of low cost, balanced casting structure and high efficiency

Pending Publication Date: 2021-08-31
JIANGSU HONGDE SPECIAL PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: In order to solve the deficiencies of the prior art, the present invention provides a manufacturing method of a 2.8MW wind power hub, which solves the problems of loose structure, graphite distortion and oxidized slag inclusion of the thick and large cross-section wind power hub, and improves the performance of the casting

Method used

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  • Manufacturing method of 2.8 MW wind power hub
  • Manufacturing method of 2.8 MW wind power hub

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0019] A method for manufacturing a 2.8MW wind power hub, comprising the steps of:

[0020] Step (1), shaking and tamping when putting the sand, the actual measurement of the sand mold tensile strength after the resin sand solidifies is 1.3MPa;

[0021] Step (1), place the cold iron on the boss of the casting, the thickness of the boss is 60-90mm, the actual thickness of the cold iron is 60mm, the straight gate is φ80, and the actual air outlet is 6 φ50 air outlets;

[0022] Step (3), using high-purity pig iron and scrap steel, controlling the sum of trace impurity elements to be less than 0.15%;

[0023] Step (4), spheroidizing inoculation: add 0.90% spheroidizing agent and 0.35% covering inoculant in turn to the spheroidizing bag, add 35ppm Sb during spheroidizing; stand still for 6 minutes after spheroidizing and then slag. After spheroidizing, C in molten iron: 3.72%, Si: 2.09%, Mn: 0.15%, P: 0.020%, S: 0.008%, Mg: 0.037%;

[0024] Step (5), control the pouring temperatu...

specific Embodiment 2

[0026] A method for manufacturing a 2.8MW wind power hub, comprising the steps of:

[0027] Step (1), shaking and tamping when putting the sand, the actual measurement of the sand mold tensile strength after the resin sand solidifies is 1.2MPa;

[0028] Step (1), place the cold iron on the boss of the casting, the thickness of the boss is 60-80mm, the actual thickness of the cold iron is 60mm, the sprue uses a φ80 straight gate, and the actual air outlet places 5 φ50 air outlets;

[0029] Step (3), using high-purity pig iron and scrap steel, controlling the sum of trace impurity elements to be less than 0.15%;

[0030] Step (4), spheroidizing inoculation: add 0.85% spheroidizing agent and 0.45% covering inoculant in turn to the spheroidizing bag, add 40ppm Sb during spheroidizing; stand still for 8 minutes after spheroidizing and then slag. After spheroidizing treatment, C in molten iron: 3.69%, Si: 2.10%, Mn: 0.13%, P: 0.021%, S: 0.009%, Mg: 0.039%;

[0031] Step (5), contr...

specific Embodiment 3

[0033] A method for manufacturing a 2.8MW wind power hub, comprising the steps of:

[0034] Step (1), shaking and tamping when putting the sand, the actual measurement of the sand mold tensile strength after the resin sand solidifies is 1.4MPa;

[0035] Step (1), place the cold iron on the boss of the casting, the thickness of the boss is 60-80mm, the actual thickness of the cold iron is 60mm, the sprue uses a φ80 straight gate, and the actual air outlet places 5 φ50 air outlets;

[0036] Step (3), using high-purity pig iron and scrap steel, controlling the sum of trace impurity elements to be less than 0.15%;

[0037] Step (4), spheroidizing inoculation: add 0.90% spheroidizing agent and 0.40% covering inoculant in turn to the spheroidizing bag, add 45ppm Sb during spheroidizing; stand still for 8 minutes after spheroidizing and then slag. After spheroidizing, C: 3.75%, Si: 2.05%, Mn: 0.14%, P: 0.022%, S: 0.010%, Mg: 0.040%;

[0038] Step (5), control the pouring temperatur...

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Abstract

The invention discloses a manufacturing method of a 2.8 MW wind power hub. The manufacturing method comprises the following steps: step 1, sand is discharged; step 2, proper chilling blocks are placed at boss positions of castings, and proper air outlet areas are selected; step 3, smelting is carried out; step 4, spheroidizing and inoculating are performed; and step 5, pouring is conducted. According to the method, the preparation method is simple, the operation is simple and convenient, the efficiency is high, a filter screen and a riser are avoided, and only a small amount of chilling blocks are adopted. The internal structure of the casting is compact, ultrasonic flaw detection and magnetic powder flaw detection are in accordance with requirements, the surface of the casting is smooth, the polishing workload is small, the whole casting structure is balanced and small in difference, and the overall mechanical property of the casting is excellent.

Description

technical field [0001] The invention belongs to the field of metallurgy, and specifically relates to a method for manufacturing a 2.8MW wind power hub. By optimizing the gating riser system, alloy element control and spheroidization inoculation process control, the graphitization expansion of nodular cast iron is fully utilized to ensure the structure and quality of the produced castings. Excellent performance. Background technique [0002] The wind power hub is an important core component of wind power generation equipment. It is a part connecting the blades and the main shaft. Its function is to withstand the thrust, torque, bending moment and gyro moment of the wind acting on the blades, and then transmit the force and moment of the wind wheel to the mechanism. middle. Wind turbines are mostly built in coastal areas or deserts, and operate at high altitudes all year round. They usually work at a low temperature of -20°C or even -40°C, and the wind speed changes greatly d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/28B22D1/00B22D15/00C22C37/04C22C37/10
CPCB22C9/02B22C9/28B22D15/00B22D1/00C22C37/10C22C37/04
Inventor 许玉松周张松
Owner JIANGSU HONGDE SPECIAL PARTS CO LTD
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