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Cast-welding and forging compounded forming method of super-huge type forge piece

A compound forming and extra-large technology, applied in the direction of metal processing equipment, etc., can solve the problems of increasing equipment tonnage and low utilization rate of equipment, and achieve the effect of improving thermal fatigue resistance, easy process, and solving internal quality control problems

Inactive Publication Date: 2012-06-20
江阴东大新材料研究院
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AI Technical Summary

Problems solved by technology

Since the production of large forgings is single piece or small batch production, the utilization rate of equipment is low, and it is not economically appropriate to increase the tonnage of equipment

Method used

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Embodiment Construction

[0023] The present invention relates to a method for manufacturing super large forgings by adopting the combined forming technology of casting welding and forging, and its typical embodiments are:

[0024] One ton of 9GrSi steel is melted and cast into steel ingots according to conventional technology. After it is forged into a steel billet using the conventional three upsetting (rough) three drawing (long) process, clean the rust and dirt on the surface of the billet, place it in the center of the casting mold, and heat the casting mold and steel to 500±50℃ for the billet and heat preservation for 20±5min . Then, at a high temperature of 1900-2000°C, 9GrSi molten steel is poured around it to weld it with the billet. Then use the conventional three upsetting (rough) and three drawing (long) processes to forge them again. If the casting and welding fails to meet the requirements, they will be cast and welded and then forged until they meet the size and performance requirements an...

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Abstract

The invention relates to a cast-welding and forging compounded forming method of a super-huge type forge piece, which comprises the following steps of: 1, firstly casing a smaller steel ingot, forging the steel ingot according to a conventional process; 2, cleaning the surface of the steel blank forged in the step 1, placing the steel blank in the center of a cast die, preheating the cast die andthe steel blank to 500+ / -50 DEG C, keeping the temperature of 20+ / -5min, and pouring molten steel with the temperature of 1,900-2,000 DEG C around the steel blank to ensure that the molten steel is welded with the steel blank for continuously forging; and 3, continuously forging the welded finished product in the step 2 according to the conventional process, if the requirements on size and performance can not met though once cast welding, cast welding again, and forging again until the requirements on the size and the performance are met. By adopting the method of the invention, the super-huge type forge piece according with the quality requirement can be produced on medium-small type equipment.

Description

(1) Technical field [0001] The invention relates to a method for forming a super large forging. It belongs to the field of material processing engineering technology. (2) Background technology [0002] Large-scale complete sets of equipment such as steel, electric power, petrochemical, nuclear power and high-energy physics have huge working loads and harsh environments. In order to ensure the reliability and safety of the equipment, the main parts on it must be produced by forging billets. The process of manufacturing large forgings is: steelmaking, ingot casting, heating, forging, preliminary heat treatment, and final heat treatment. Metallurgical defects such as voids, bubbles, looseness, inclusions or segregation formed in the ingot body during the ingot casting process must be repaired or improved during the forging process. The existing methods for repairing defects are to change the shape and size of the tool or anvil to improve the internal stress state of the forging bi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P17/00B21J5/00B22D19/00
Inventor 陈威谭佃龙毕小平刘礼华李吉峰朱磊郑召全
Owner 江阴东大新材料研究院
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