Piston, piston manufacturing device and piston manufacturing method

Abstract

The invention belongs to the technical field of machining, and discloses a piston, a piston manufacturing device and a piston manufacturing method. The piston includes: a piston base; a porous functional layer, which is arranged on the top surface of the piston base; a microporous filling layer, which is arranged on the top surface of the porous functional layer, and the hole diameter in the micropore filling layer is smaller than that in the porous functional layer. The diameter of the hole; the sealing layer, which is arranged on the top surface of the micropore filling layer, is used to block the holes in the micropore filling layer. While the microporous filling layer of the piston plays the role of transition between the porous functional layer and the sealing layer, the microporous filling layer plays a role of filling the porous functional layer to a certain extent. The sealing layer acts as a plug to prevent the corrosive medium from entering the pores of the porous functional layer and the microporous filling layer to corrode them, thereby improving the corrosion resistance of the piston. In addition, air can be filled in the pores of the porous functional layer and the micropore filling layer, which effectively reduces the volume specific heat capacity of the coating.

Description

technical field [0001] The invention relates to the technical field of machining, in particular to a piston, a piston manufacturing device and a piston manufacturing method. Background technique [0002] Due to the excellent properties of aluminum alloy materials such as low density, good thermal conductivity, and high strength, aluminum alloy materials are widely used in related fields of internal combustion engine piston manufacturing. Compared with traditional steel pistons and cast iron pistons, aluminum alloy pistons have a series of advantages in internal combustion engine applications, such as high power, low vibration, small wear and strong corrosion resistance. However, with the development and renewal of internal combustion engine technology, defects such as low thermal strength and poor high-temperature mechanical properties of aluminum alloy pistons are gradually exposed. Under the action of high-intensity thermal shock cycles, aluminum alloy pistons often suffer...

AI Technical Summary

Problems solved by technology

However, with the development of heat insulation technology, the heat insulation performance of the heat insulation material is gradually improved, and the excellent heat insulation can protect the matrix. However, due to the large volume specific heat capacity of the heat insulation material, the piston itself is not easy to be heated, and the combustion chamber The higher the intake temperature of the cold air, the higher the combustion temperature will be

When the combustion temperature increases to a certain level, the distance between gas molecules in the combustion chamber will increase, resulting in a decrease in the suction volume of the suction stroke, thereby reducing the fuel-gas ratio and combustion efficiency.

[0004] In addition, in the preparation of the existing plasma oxide coating, the traditional electrolyte adjustment can increase the concentration by adding solute, but if you want to reduce the concentration, or set different proportions with the plasma oxide coating at different growth stages solution, it is necessary to interrupt the reaction and re-preparate the electrolyte, which increases the preparation time and cost

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