Induction heat treatment device and method for strengthening the inner surface of high-pressure fuel injection pipe
A technology of induction heat treatment and high pressure fuel, which is applied in heat treatment furnaces, heat treatment equipment, and energy efficiency improvement. It can solve problems such as difficulty in detection, potential safety hazards, and easy stress release, and achieve fast heating speed, shortening transformation time, and expanding transformation. Effect of temperature range
Active Publication Date: 2017-08-08
SHANGHAI USUI ENGINE PARTS
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Problems solved by technology
However, this method has a defect, that is, when the tubing falls or is deformed during installation and correction, the residual stress on the inner surface is easy to be released, and it is difficult to detect
This brings certain security risks to the actual use
Method used
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Embodiment 1
[0043] Please see attached figure 1 , 2, 3, an induction heat treatment device for strengthening the inner surface of the high-pressure fuel injection pipe, which includes an induction heating coil 1, an annular coolant nozzle 2, an infrared thermocouple 3, a metal pipe 4, a feedback control system 5, and a cooling tower I6 , the cooling tower II7 is characterized in that an induction coil 1 is set at a distance of 3 to 15 mm from the outer surface of the metal pipe 4, so that the pipe passes through the induction coil, and the induction coil is connected with the feedback control system 5 and the cooling tower I6, and the feedback control The system is used to accurately and stably control the heating temperature of the induction coil. The cooling tower 1 is used to circulate the cooling water in the induction coil; Feedback the data to the control unit; set an annular cooling nozzle 2 at a distance of 50-100mm from the induction coil, which is used to rapidly cool and harde...
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Abstract
The invention relates to an inductive heat treatment method used for strengthening the inner face of a high-pressure fuel injection pipe. The inductive heat treatment method used for strengthening the inner face of the high-pressure fuel injection pipe is characterized by including the specific steps that (1), a pipe material is heated as a whole and made to be austenitized; (2), the heated pipe material is cooled at high speed, and a metal pipe is hardened in a quenched manner as a whole, wherein an annular cooling sprayer is used for spraying cooling liquid to the metal pipe for 5-30 min, and the metal pipe is cooled at high speed; (3), the outer surface is annealed and heated, and current parameters are strictly controlled; and (4), the heat-preserved pipe material is subject to air cooling, wherein the pipe material is placed at room temperature till the metal pipe is totally cooled. According to the inductive heat treatment method used for strengthening the inner face of the high-pressure fuel injection pipe, the metal pipe is low in brittleness and high in fatigue strength after being quenched; and bending is performed after the inner surface is strengthened, because the inner face is strengthened in a heat treatment manner, the residual stress of the bent inner face cannot be released easily, and finally the purpose of improving the internal-pressure fatigue strength is improved.
Description
[0001] 【Technical field】 [0002] The invention relates to the technical field of high-pressure fuel injection pipes, in particular to an induction heat treatment device and method for strengthening the inner surface of high-pressure fuel injection pipes. [0003] 【Background technique】 [0004] In order to meet the needs of increasingly stringent emission regulations, diesel engine injection pressure is getting higher and higher. From the 80-120MPa of early mechanical pumps, through the 145-160MPa of the National 3 period, it has developed to the 180-220MPa or even higher pressure of the recent National 4 and National 5 emissions. As one of the important parts of the injection system, the high-pressure oil pipe is regarded as the "blood vessel" of the engine in the industry, and its dynamic pressure resistance is facing major technical challenges. [0005] For high-pressure oil pipes with a system pressure exceeding 160MPa, self-reinforcing technology by loading prestress is ...
Claims
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IPC IPC(8): C21D1/10C21D9/08
CPCC21D1/10C21D9/085Y02P10/25
Inventor 毛国豪何丹凤王玉黄志伟李金才张颖吉
Owner SHANGHAI USUI ENGINE PARTS