Method for manufacturing wind power forging by using 20CrMnMo continuous casting blank

A technology for continuous casting blanks and forgings, applied in the field of forging manufacturing, can solve the problems of reducing the mechanical properties of forgings, affecting the fatigue life of forgings, and having many defects in continuous casting blanks, so as to achieve the effect of ensuring fatigue life.

Active Publication Date: 2012-05-30
CHONGQING CHANGZHENG HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many internal defects in the continuous casting slab, especially the internal shrinkage cavity, porosity, equiaxed crystal zone, columnar crystal zone, dendrite segregation, regional segregation, central crack, internal bubble and other defects are more obvious in the continuous casting slab above Φ600
Conventional forging process is difficult to eliminate or weaken these defects, and its residue in forgings will seriously reduce the mechanical properties of forgings and affect the fatigue life of forgings

Method used

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  • Method for manufacturing wind power forging by using 20CrMnMo continuous casting blank
  • Method for manufacturing wind power forging by using 20CrMnMo continuous casting blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] See figure 1 : the method for making wind power forgings with 20CrMnMo continuous casting slab shown is characterized in that comprising the following steps:

[0022] (1) Material selection, select the continuous casting slab with the grade of 20CrMnMo, the continuous casting slab is a cylindrical continuous casting slab, and the diameter of the continuous casting slab is Φ≥600mm;

[0023] (2) For the first heating of the furnace, the selected continuous casting slabs are loaded into a chamber-type natural gas heating furnace for heating. Ignite until the temperature rises to 1250°C, and the heating rate is ≤200°C / h;

[0024] (3) Forging, on the 8MN hydraulic press, carry out two upsetting and drawing on the heated continuous casting billet to ensure that the first upsetting and drawing ratio is: the upsetting ratio is 2.3, the drawing length ratio is 2.1, and the second upsetting and drawing ratio is : The upsetting ratio is 2.0, the drawing ratio is 1.8, and the ini...

Embodiment 2

[0029] See figure 1 : the method for making wind power forgings with 20CrMnMo continuous casting slab shown is characterized in that comprising the following steps:

[0030] (1) Material selection, select the continuous casting slab with the grade of 20CrMnMo, the continuous casting slab is a cylindrical continuous casting slab, and the diameter of the continuous casting slab is Φ≥600mm;

[0031] (2) For the first heating of the furnace, the selected continuous casting slabs are loaded into a chamber-type natural gas heating furnace for heating. Ignite until the temperature rises to 1265°C, and the heating rate is ≤200°C / h;

[0032] (3) Forging, on the 8MN hydraulic press, perform two upsetting and drawing on the heated continuous casting slab to ensure that the first upsetting and drawing ratio is: the upsetting ratio is 2.4, the drawing length ratio is 2.2, and the second upsetting and drawing ratio is : The upsetting ratio is 2.1, the drawing ratio is 1.9, and the initial...

Embodiment 3

[0037] See figure 1 : the method for making wind power forgings with 20CrMnMo continuous casting slab shown is characterized in that comprising the following steps:

[0038] (1) Material selection, select the continuous casting slab with the grade of 20CrMnMo, the continuous casting slab is a cylindrical continuous casting slab, and the diameter of the continuous casting slab is Φ≥600mm;

[0039] (2) For the first heating of the furnace, the selected continuous casting slabs are loaded into a chamber-type natural gas heating furnace for heating. Ignite until the temperature rises to 1280°C, and the heating rate is ≤200°C / h;

[0040] (3) Forging, the heated continuous casting slab is subjected to two upsetting and drawing on the 8MN hydraulic press to ensure that the first upsetting and drawing ratio is: the upsetting ratio is 2.5, the drawing length ratio is 2.3, and the second upsetting and drawing ratio is : The upsetting ratio is 2.2, the drawing ratio is 2.0, and the ini...

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Abstract

The invention discloses a method for manufacturing a wind power forging by using a 20CrMnMo continuous casting blank, which comprises the following steps of: selecting materials, charging in a furnace for first heating, forging, charging the furnace for second heating, forging and forming, and normalizing. In the method for manufacturing the wind power forging by using the 20CrMnMo continuous casting blank, internal defects are welded through high-temperature heating, forging and pressing in earlier stage, and internal textures are finned through low-temperature heating and forming in later stage, thus the requirements for relevant ultrasonic flaw detection and grain size can be achieved and the fatigue life of the wind power forging is ensured.

Description

technical field [0001] The invention relates to a method for manufacturing a forging, in particular to a method for manufacturing a wind power forging by using a 20CrMnMo continuous casting slab. Background technique [0002] Wind power forgings are an important part of the gearbox in the wind power generation system. The fan blades are driven by the wind to obtain strong kinetic energy and transmit it to the generator through it. Most of the wind farms in our country are located in the freezing north, where the wind speed changes rapidly. Working in such harsh conditions, forgings not only have to bear a large alternating load, but also bear a huge impact load. Therefore, special requirements are placed on its mechanical properties. High, any defect will affect its mechanical properties, reduce its fatigue life, and seriously affect the safety and reliability of the entire wind power generation system. The raw material of wind power forgings is continuous casting slab, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/76C21D8/00
Inventor 艾明平龚超郭伦黄文标
Owner CHONGQING CHANGZHENG HEAVY IND
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