A strengthening treatment method for the throat of the aluminum alloy piston combustion chamber of an internal combustion engine
A technology of enhanced treatment and combustion chamber, which is applied in the field of enhanced treatment of the throat of the aluminum alloy piston combustion chamber of an internal combustion engine, can solve the problems of increased processing and manufacturing costs, decreased production efficiency, technical difficulties in casting, processing and testing of ceramic fiber reinforced pistons, and achieves Improved heat engine fatigue strength and improved service life
Inactive Publication Date: 2011-12-07
DONGFENG MOTOR PARTS & COMPONENTS GROUP
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Problems solved by technology
Due to the difficulty in casting, processing and testing technologies of ceramic fiber reinforced pistons, mass production capacity cannot be formed to meet the needs of engines
The hinged piston with steel top and aluminum skirt and all-steel piston double the weight of the piston, increase the fuel consumption of the engine, and increase the strength requirements of other components such as the crankshaft. In addition, a series of problems such as increased processing and manufacturing costs and decreased production efficiency cannot be achieved. be the best choice
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[0010] according to figure 1 , 2 As shown, the present invention is further described as follows: a method for strengthening treatment of the throat of an internal combustion engine aluminum alloy piston combustion chamber, the specific steps are: (1), pretreatment: cleaning, degreasing, and derusting the rough-processed piston blank treatment, and then heat preservation treatment at 50-150°C for 0.5-1.5 hours; （ 2) Remelting treatment: remelting the throat of the piston combustion chamber 2 of the piston body 1 by argon tungsten arc welding, fixing the welding torch 4 so that the tungsten pole is aligned with the throat of the piston combustion chamber, The piston rotates, the speed is controlled at 0.28-0.58rpm, and the tungsten electrode current is controlled at 100-350 amperes at the same time to obtain the required depth of the remelting layer, and natural air cooling is adopted; (3) Finishing after remelting: Finishing the remelted pistons to obtain finished products ...
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Abstract
The invention proposes a method for strengthening treatment of the throat of an aluminum alloy piston combustion chamber of an internal combustion engine. The main technical points are: remelting the rough-processed piston blank by argon tungsten arc welding at the throat of the piston combustion chamber, and Air is used for natural cooling; the remelted piston is refined to obtain the finished product. The depth of the remelted layer is 0.5-8mm, and the particle size of the primary silicon phase and intermetallic phase of the remelted layer is the particle size of the unremelted part of the matrix. 1 / 4 to 1 / 10 of the size, the hardness of the remelted layer is about 50% higher than that of the unremelted part, and the hardness of the remelted layer is not less than 150HV. The invention improves the heat-mechanical fatigue strength of the piston by about 2 to 5 times, improves the service life of the piston, and satisfies the harsh conditions for the use of the piston.
Description
technical field [0001] The invention relates to a method for strengthening the throat of a combustion chamber of an aluminum alloy piston of an internal combustion engine, in particular to a method for strengthening the remelting treatment of an aluminum alloy piston of an internal combustion engine. Background technique [0002] Under the premise of meeting the requirements of light weight and miniaturization, reliability and durability of internal combustion engines, as well as strict emission standards, internal combustion engines are developing in the direction of high speed, high power and high compression ratio, and the temperature and pressure in the piston combustion chamber become Higher, the throat of the piston combustion chamber is prone to fatigue cracking under the repeated action of thermal-mechanical stress. Therefore, in addition to the continuous improvement of performance requirements for normal temperature strength, hardness, elongation, and thermal expan...
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IPC IPC(8): C23C24/10
Inventor 袁国民郑思乐樊晓光赵俊平吴永强
Owner DONGFENG MOTOR PARTS & COMPONENTS GROUP