Steel piston for diesel engine and production process thereof

Abstract

The invention discloses a steel piston for a diesel engine and a production process thereof. The steel piston comprises a piston seat, two semi-annular oil duct baffle plates which are same and a pair of piston skirts which are symmetrically arranged along the axis of the piston seat, wherein a combustion room is arranged at the head of the piston seat, a cooling liquid groove is formed in the back surface of the piston seat, a pair of symmetrically arranged supporting seats is further integrally forged on the back surface of the piston seat and through holes are formed in the supporting seats, the piston skirts compress the oil duct baffle plates above the cooling liquid groove and the two side edges of the piston skirts are connected to the side edges of the supporting seats to form piston guide seats, oil inlets are formed in the oil duct baffle plates and pin holes are formed in the edge positions, and aligning pins matched with the pin holes are arranged on the piston seat. The steel piston disclosed by the invention is simple in structure, the acting force on a weld joint is small in a piston moving process, the guiding precision of the piston can be controlled well, the service life of the piston is prolonged, and the strength and the anti-impact capacity of the piston are improved; the adopted production process is concise and reasonable in process, convenient to produce and suitable for scaled production.

Description

technical field [0001] The invention relates to a steel piston for a diesel engine and a production process thereof, belonging to the field of steel pistons. Background technique [0002] High-pressure common rail, turbocharging, post-processing technology... the promotion and development of a series of internationally advanced key component technologies in China seem to show certain regularity, and the same is true for the key component piston of the engine. Heavy-duty diesel engines have already used all-steel pistons, and the next generation of light-duty diesel engines for passenger cars in Europe are also switching to all-steel pistons in large quantities. Therefore, from the perspective of development trend, the future generations of high-performance diesel engines in Europe will all use steel pistons. Considering that China will implement the National VI emission regulations around 2020, the demand for heavy-duty diesel engines in China is relatively low compared with...

AI Technical Summary

Problems solved by technology

[0003] With the continuous improvement of heavy-duty diesel engine strengthening indicators, it will be a trend for heavy-duty diesel engines to adopt advanced forged steel pistons. Starting from the National V, China's heavy-duty diesel engine market will need steel pistons. It is expected that by 2022, China's steel pistons may usher in Explosive growth, the demand will reach about 2 million. In view of the explosive growth of steel pistons, more and more domestic companies have begun to develop steel pistons. Steel pistons are a kind of pistons that use steel instead of aluminum. Strength, but the processing performance will decrease. At present, most steel pistons adopt integral structure or two-stage structure. The machining process of integral structure steel pistons is very difficult, especially when processing piston coolant tanks. It is very complicated. In addition, common guide The seat is limited by the product structure and it is not easy to make it too long. The two-stage steel piston is processed separately by the piston seat and the guide seat. Finally, the piston seat and the guide seat are spliced ​​by welding. The weld is located on the back of the piston seat. When the piston When doing work, it is directly affected by the pulling force and shearing force of the piston, and the weld is easy to break, so the existing steel piston structure needs to be improved

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