Manufacturing technology of integrated forged steel piston

Abstract

The invention provides a manufacturing technology of an integrated forged steel piston. The manufacturing technology comprises the steps of carrying out rough machining on a forged piston head part and a piston skirt part; smearing a borax soldering flux on a welding area of the piston head part; assembling the piston head part and the piston skirt part, and carrying out heating; and after heating, taking out a workpiece, and naturally cooling the workpiece. After the technology is adopted, weld joints generated through piston friction welding are avoided, the risk that hard grains falling due to the fact that the weld joints are washed through cooling oil are liable to scratch a cylinder of an engine is reduced, the piston head part and the piston skirt part are welded through adopting brazing, the technology is simple, the equipment investment is low, and multiple same or different products can be welded at a time.

Description

technical field [0001] The invention relates to a manufacturing process of a piston, in particular to a manufacturing process of an integral forged steel piston. Background technique [0002] In the past ten years, engine design and manufacturing technology have been rapidly improved, especially diesel engines are developing towards high power and high load, and the degree of strengthening has been continuously improved. The explosive force has exceeded 20MPa, and the aluminum piston has been difficult to meet the engine requirements. So now many companies are choosing steel materials to replace aluminum alloy materials, especially the development of forged steel piston materials has indicated the current direction of piston development. The piston skirt is manufactured separately. Due to the large difference in wall thickness of the piston skirt, the casting rejection rate is high, which increases the cost, and it is difficult to form a closed oil chamber, and the cooling e...

AI Technical Summary

Problems solved by technology

The welding seam in the closed oil chamber of this welding method cannot be cleaned, and hard particles will fall off during the vibration of the cooling oil, which may cause the risk of engine scuffing

In addition, friction welding has a huge investment and consumes a lot of electric energy, resulting in a waste of energy.

In addition, if the friction welding head and skirt cannot stop rotating instantly, it will cause welding defects, which will cause the head and skirt to detach during use, resulting in damage to the engine or even the scrapping of the entire locomotive

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