Full-closed multi-way integral die-forging forming process for large-size valve bodies

Abstract

The invention discloses a full-closed multi-way integral die-forging forming process for large-size valve bodies. The full-closed multi-way integral die-forging forming process is characterized by sequentially including steps of blanking, heating, descaling, making blanks, multi-way die-forging forming, heat insulating and slow cooling. The step of multi-way die-forging forming includes that hydraulic systems of a back press, a left press and a right press are communicated mutually and apply force jointly to squeeze workpieces from all sides in a closed manner so as to complete die-forging forming of integral structures of valve bodies. By the full-closed multi-way integral die-forging forming process for the large-size valve bodies, the integral structures, including three-way flanges and three-way inner bores, of the valve bodies, can be finished by one die-forging process, a process of residue flash removal is omitted, defects of the prior art are overcome, utilization rate of raw materials is increased by at least 20% effectively, machining efficiency is increased by at least 60%, full-fiber die-forging forming of metal is also realized, comprehensive mechanical performance of products is improved, and product quality is guaranteed.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a fully enclosed multi-directional integral die forging process for a large valve body. Background technique [0002] Due to the limitation of manufacturing equipment and process conditions, the traditional way of manufacturing valve body adopts casting, welding, die forging hammer die forging, hydraulic press die forging, etc. These technologies have certain limitations and defects. For example: the mechanical properties of the products produced by the casting process are low; the overall structure of the products manufactured by the die forging hammer die forging process has been improved, but due to the internal control, the forging cannot be formed, the product is not fully deformed, the forgeability is poor, and the overall mechanical properties are also affected. On the other hand, the utilization rate of raw materials is very low, and the manufacturing cost is high;...

AI Technical Summary

Problems solved by technology

[0009] c. Low production efficiency: After the process is completed, it is necessary to increase the trimming process, and to increase the mechanical drilling to complete the three-way inner hole structure, which consumes a lot of machining costs;

[0010] d. Full-fiber forging cannot be realized: the remaining material cavity is added, and the remaining material must be cut off after the forging is completed, cutting off the metal fiber

[0011] ③Multidirectional hydraulic press forging (b): The three-way inner hole of the valve body can be forged, but the three-way flange cannot be forged at the same time. The flange must be welded, which affects the overall structure of the valve body;

[0012] ④ Casting process manufacturing: only suitable for low-pressure products with low performance requirements;

[0014] The three-position flange and three-position inner hole cannot be integrally forged at the same time, and the forging flash remains, resulting in low material utilization and low production efficiency

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