Forging method of valve

Abstract

The invention relates to a forging method of a valve. The method specifically comprises the following steps: (1) preparing a sample; (2) testing; (3) blanking; (4) heating a blank; (5) preparing a blank; (6) pre-forging; (7) refining; (8) thermally cutting edges; (9) inspecting for the first time; (10) thermally treating; (11) performing shot blasting; (12) inspecting for the last time. With the adoption of the forging method, an A105 steel forging of the valve can be uniformly forged, the processing costs a little time, and the forging accuracy is high.

Description

technical field [0001] The invention relates to the field of processing forged steel parts, in particular to a forging method of a valve body. Background technique [0002] The valve body is mainly forged from valve steel, which is an important branch of heat-resistant steel and a special material for the manufacture of intake and exhaust valves for internal combustion engines. This material is often under the working conditions of high temperature of 450~900°C and explosion pressure of 3000~7000kPa, and has long been subjected to high temperature corrosion and erosion of gasoline, diesel and other gases, as well as friction between the valve itself and the valve seat. Therefore, the valve material must have sufficient thermal strength, high temperature corrosion resistance, oxidation resistance, wear resistance and impact resistance at the highest operating temperature. [0003] In response to this special condition, a large part of the current valve steel is selected from...

AI Technical Summary

Problems solved by technology

[0003] In response to this special condition, a large part of the current valve steel is selected from A105 steel. The current forging process of A105 steel is as follows: including blank blanking, blank heating, blank forming, pre-forging, precision forging, edge trimming, first inspection welding repair Repair, heat treatment, shot blasting, tail inspection, among them, when the blank is formed, it is forged by an air hammer. During the forging process of the air hammer, the forging is manually placed under the air hammer and hammered into a preliminary shape Prototype, this forming method will cause uneven forging of forgings, especially at present, many products are export products, the precision of forged products in this way is not high, and does not meet the export requirements, and the forgings forged by air hammer will cause damage to the forgings , so after the edge is eagerly cut, it is necessary to repair the damaged forging by welding and then pickling. Therefore, this traditional process will cause the shortcomings of uneven forging, low precision and long processing time, which need to be improved