Method for forging large forging

A technology of large forgings and forging temperature, applied in the field of large forgings forming, can solve the problems of difficult deformation, difficult elimination, difficult performance, etc., and achieve the effect of improving deformation unevenness, internal stress state, and overall performance.

Active Publication Date: 2012-03-21
JIANGSU JINYUAN FORGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production practice shows that cooling forging does greatly improve the quality of forgings, but when the above method is used for forging, since the energy is concentrated to the easily deformed core, the defects of the core can be well eliminated, but the temperature of the surface area during forging is far away. The temperature is much lower than the core, the surface area is not easy to deform, and the defects are not easy to eliminate
In addition, in the ordinary free forging pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 20CrMnMo continuous casting slabs are used to manufacture wind power forgings, and the continuous casting slabs with the brand name of 20CrMnMo are selected. The continuous casting slabs are cylindrical continuous casting slabs with a diameter of Φ≥600mm. The forging process is as follows:

[0026] (1) Put the 20CrMnMo continuous casting slab into a natural gas heating furnace for heating, heat it to 1250°C, and keep it in the temperature range of 1250°C for 6 hours, and the heating rate is ≤100°C / h;

[0027] (2) Air cooling is used to reduce the surface temperature of the continuous casting slab to 700-800°C, while the core remains at a high temperature, and when the temperature difference between the inside and outside reaches 400-450°C; the total deformation degree of the heated continuous casting slab on the hydraulic press is 15% center compaction forging to get steel billets;

[0028] (3) Put the steel billet into the furnace and reheat it to 1250°C, and keep it i...

Embodiment 2

[0032] A large-scale wind power shaft forging was prepared, made of 20CrMnMo steel, and a standard ten-ton octagonal steel ingot was billeted. After ultrasonic flaw detection, there were holes with a maximum diameter of about 2mm inside the material. Its forging process is as follows:

[0033] (1) Put the 20CrMnMo steel billet into a natural gas heating furnace for heating, heat it to 1250°C, and keep it in the temperature range of 1250°C for 10 hours, wherein the heating rate is ≤100°C / h;

[0034] (2) Air cooling is used to reduce the surface temperature of the slab to 700-800°C, while the core remains at a high temperature, and when the temperature difference between the inside and outside reaches 400-450°C; the total deformation of the heated slab is 20% on a hydraulic press The center of the compaction forging, get billet;

[0035] (3) After the above-mentioned forged billet is cooled to 700°C~800°C, it is reheated in the furnace, and the temperature is raised to 1250°C a...

Embodiment 3

[0039]A large-scale shaft forging made of 34CrNiMoA alloy steel. A standard 10-ton octagonal steel ingot was billeted. Ultrasonic flaw detection revealed that there were holes with a maximum diameter of about 2mm inside the material. Its forging process is as follows:

[0040] (1) Put the 34CrNiMoA alloy steel billet into a natural gas heating furnace for heating, heat it to 1250°C, and keep it in the temperature range of 1250°C for 10 hours, wherein the heating rate is ≤100°C / h;

[0041] (2) Air cooling is used to reduce the surface temperature of the slab to 700-800°C, while the core remains at a high temperature, and when the temperature difference between the inside and outside reaches 400-450°C; the total deformation of the heated slab is 10% on a hydraulic press Central compaction forging;

[0042] (3) Install the furnace and heat again, raise the temperature to 1250 ° C, and keep it warm for 6 hours in the temperature range of 1250 ° C; on the hydraulic press, it is fo...

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Abstract

The invention relates to a method for forging a large forging, which comprises the following steps: heating a casting blank or continuous casting blank to a forging temperature, and keeping the temperature; 2, cooking to reduce the surface temperature of the casting blank to 700 to 800 DEG C while keeping the high temperature in a central part, and performing central compression forging with a total deformation degree of 6 to 20 percent on a blank material when the difference between the internal temperature and the external temperature reaches 400 to 450 DEG C to obtain a steel blank; and 3) cooling the whole steel blank to 700 to 800 DEG C, rising the temperature at a speed of 50 to 100 DEG C/h to a forging temperature, keeping the temperature, namely keeping the surface regional temperature of the steel blank to a forging temperature and the central temperature still between 700 and 800 DEG C, and performing forging with a total deformation amount of 6 to 20 percent of the steel blank. The large-forging forging method can effectively eliminate the drawbacks of large forgings and improve the mechanical properties and surface and central deformation uniformity and structural and mechanical property uniformity of the large forgings.

Description

technical field [0001] The invention belongs to the technical field of material processing engineering, and in particular relates to a large forging forming method. Background technique [0002] Large-scale complete sets of equipment for steel, electric power, petrochemical, nuclear power, high-energy physics, and wind power generation have huge workloads and harsh environments. In order to ensure the reliability and safety of equipment, Take wind power forgings as an example. Wind power forgings are often important parts in wind power generation systems. Most of the wind farms in my country are located in the freezing north, where the wind speed changes rapidly. Working in such harsh conditions, forgings not only have to bear large alternating loads , but also to withstand huge impact loads, therefore, its mechanical properties are often required very high, due to the distribution of alternating loads in the part section, the surface properties of the part are particularly i...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J1/06
Inventor 葛艳明孔见李周葛阿金袁志伟杨志华
Owner JIANGSU JINYUAN FORGE
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