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42CrMo4 wind driven generator main shaft control method

A technology for wind turbines and control methods, which is applied to manufacturing tools, furnace types, furnaces, etc., can solve the problems of increased specifications and increased difficulty in organizational control, and achieves the effect of stable performance

Active Publication Date: 2018-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, fans have shown a trend of large-scale development, the specifications of the main shaft have also increased accordingly, and the difficulty of tissue control has increased. In addition, the requirements for mechanical performance indicators have become higher and higher. The performance requirements at the subcutaneous 185mm are: yield strength ≥ 525MPa, Tensile strength ≥ 680Mpa, -30 ℃ impact energy Akv ≥ 27J, the existing manufacturing process can no longer meet the technical requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, the cast steel composition of the high-strength, high-toughness low-temperature service cast steel material is as follows:

[0022] element

Content (wt%)

C

0.41

Si

0.25

mn

0.73

P

0.01

S

0.001

Ni

0.53

Cr

1.12

Mo

0.26

V

0.2

Al

0.017

Cu

0.04

RE

0.016

Fe

margin

[0023] The heat treatment adopts the following steps: ① After the main shaft is forged, heat preservation is carried out at 860°C. The heat preservation time is selected according to 1h / 25mm thickness, and then pearlite annealing is carried out at 730°C. The heat preservation time is selected according to 1h / 25mm thickness. ② Then the main shaft is normalized twice, the normalizing temperature is 860°C, the holding time is selected according to 1h / 25mm thickness, and then it is air-cooled to below 300°C. ③ Then the main shaft is quenched, using alternate w...

Embodiment 2

[0027] In this embodiment, the cast steel composition of the high-strength, high-toughness low-temperature service cast steel material is as follows:

[0028] element

Content (wt%)

C

0.41

Si

0.27

mn

0.79

P

0.011

S

0.006

Ni

0.46

Cr

1.10

Mo

0.27

V

0.25

Al

0.01

Cu

0.08

RE

0.011

Fe

margin

[0029] The heat treatment adopts the following steps: ① After the main shaft is forged, heat preservation is carried out at 860°C. The heat preservation time is selected according to 1h / 25mm thickness, and then pearlite annealing is carried out at 750°C. The heat preservation time is selected according to 1h / 25mm thickness. ② Then the main shaft is normalized twice, the normalizing temperature is 880°C, the holding time is selected according to 1h / 25mm thickness, and then it is air-cooled to below 300°C. ③ Then the main shaft is quenched, adopting alterna...

Embodiment 3

[0033] In this embodiment, the cast steel composition of the high-strength, high-toughness low-temperature service cast steel material is as follows:

[0034] element

Content (wt%)

C

0.42

Si

0.22

mn

0.75

P

0.008

S

0.003

Ni

0.57

Cr

1.13

Mo

0.25

V

0.18

Al

0.022

Cu

0.10

RE

0.020

Fe

margin

[0035] The heat treatment adopts the following steps: ① After the main shaft is forged, heat preservation is carried out at 860°C. The heat preservation time is selected according to 1h / 25mm thickness, and then pearlite annealing is carried out at 710°C. The heat preservation time is selected according to 1h / 25mm thickness. ② Then the main shaft is normalized twice, the normalizing temperature is 890°C, the holding time is selected according to 1h / 25mm thickness, and then it is air-cooled to below 300°C. ③ Then the main shaft is quenched, adopting altern...

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Abstract

The invention relates to the field of material composition design and heat treatment, in particular to a high-performance 42CrMo4 wind driven generator main shaft control method. According to weight percentage, a 42CrMo4 wind driven generator main shaft comprises the following chemical components including 0.39%-0.42% of C, 0.20%-0.30% of Si, 0.70%-0.80% of Mn, 1.10%-1.20% of Cr, 0.25%-0.30% of Mo, not larger than 0.10% of Cu, not larger than 0.05% of Al, not larger than 0.012% of P, not larger than 0.008% of S and the balance Fe. According to the high-performance 42CrMo4 wind driven generatormain shaft control method, through microalloy adding, molten steel purification treatment and forging and heat treatment texture control, the finally manufactured 42CrMo4 wind driven generator main shaft has the good toughening matching degree; and at the under-skin 185 mm position, the yield strength (Re) is larger than or equal to 525 MPa, the strength of extension (Rm) is larger than or equalto 680 MPa, the elongation (A) is larger than or equal to 16%, and the -30 DEG C ballistic work (AKv) is larger than or equal to 27 J.

Description

technical field [0001] The invention relates to the field of material composition design and heat treatment, in particular to a high-performance 42CrMo4 wind power generator main shaft control method. Background technique [0002] The wind turbine main shaft is a key component connecting the blades and the generator. The working environment is complex and requires good strength and toughness matching. In recent years, fans have shown a trend of large-scale development, the specifications of the main shaft have also increased accordingly, and the difficulty of tissue control has increased. In addition, the requirements for mechanical performance indicators have become higher and higher. The performance requirements at the subcutaneous 185mm are: yield strength ≥ 525MPa, Tensile strength ≥ 680Mpa, -30 ℃ impact energy Akv ≥ 27J, the existing manufacturing process can no longer meet the technical requirements. Contents of the invention [0003] The purpose of the present inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/20C22C38/06C22C38/44C22C38/42C22C38/46C22C38/24C21D9/28C21D1/26C21D1/28C21D1/18C21D8/06
CPCC21D1/18C21D1/26C21D1/28C21D8/065C21D9/28C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/42C22C38/44C22C38/46
Inventor 傅排先孙宸刘宏伟胡小强王培刘航航李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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