Forming process of ultra-high pressure stainless steel forging oil rail
A molding process, stainless steel technology, applied in manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc., can solve problems such as easy failure, cracking and oil leakage, avoid leakage risks, optimize production costs, and ensure reliability. sexual effect
Active Publication Date: 2018-10-09
SHANGHAI WINKELMANN LONGCHUAN (SWL) MOTORCOMPONENTS CO LTD
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Problems solved by technology
The disadvantage of such a process is that the copper brazing of different parts is prone to failure in repeated cycle pulses under the current working pressure, and leads to cracking and oil leakage
In order to meet the requirements of more energy saving and environmental protection, the country will soon introduce more stringent National VI emission standards. In order to adapt to this standard, major mainstream car companies have begun to develop the next generation of higher working pressure (hereinafter referred to as ultra-high pressure) fuel direct injection systems. The pressure rises to 350bar, and the oil rail produced by the current process means greater risk for this working pressure. Therefore, it is necessary to develop a one-piece stainless steel forged oil rail that can adapt to the ultra-high pressure working environment
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[0017] The preferred embodiments of the present invention will be described in detail below in combination with the tables.
[0018] The invention discloses a forming process of an ultra-high pressure stainless steel forging oil rail, which comprises the following steps:
[0019] 1) For blanking, use DIN 1.4301 (SUS 304) low-carbon stainless steel as the forging raw material, and its chemical composition mass percentage is: C: ≤0.07%, Si: ≤0.7%, Mn: 1-2%, Cr: 15-19 %, P: ≤0.05%, Ni: 7.9-10.6%; S: 0.018%; Ni (nickel), Cr (chromium) are important austenitic stainless steel additive elements, which can effectively improve the hardenability and resistance of stainless steel Corrosion, so the proportion must be guaranteed, and S (sulfur) and P (phosphorus) are harmful non-metallic inclusion elements, which are easy to make steel brittle and reduce the corrosion resistance of stainless steel; through Forge software CAE simulation, determine the original bar The length of the materi...
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Abstract
The invention discloses a moulding technology of an ultrahigh-pressure stainless steel forged oil rail. The moulding technology comprises the following steps: 1) blanking; 2) performing medium-frequency heating; 3) preforging; 4) performing finish forging; 5) cutting edges; 6) quenching; 7) performing shot blasting; 8) performing pickling passivation. Compared with the conventional brazed stainless steel oil rail products, the ultrahigh-pressure stainless steel forged oil rail manufactured by the moulding technology has the advantages as follows: the welding technical process and the like can be creatively saved so as to effectively avoid possible leakage risks at welding positions of the conventional brazed stainless steel oil rail products, and thus the reliability of the products in an ultrahigh-pressure working environment is ensured; meanwhile, the production cost is optimized.
Description
technical field [0001] The invention relates to a forming process of auto parts, in particular to a forming process of an ultra-high pressure stainless steel forging oil rail. Background technique [0002] The current mainstream models with turbocharged direct injection function generally adopt a working pressure of 250bar, that is, pressurize gasoline to a liquid gas state of 250bar, and inject it into the cylinder for combustion at high speed. The fuel distribution pipe currently used for this It is made of stainless steel, and the machined parts such as the main oil rail and the injector seat are fixed into a whole by copper brazing. The disadvantage of such a process is that the copper brazing of different parts is prone to failure in repeated cycle pulses under the current working pressure, and leads to cracking and oil leakage. In order to meet the requirements of more energy saving and environmental protection, the country will soon introduce more stringent National ...
Claims
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IPC IPC(8): C22C38/58C22C38/04C22C38/02C21D8/00C23G1/08B21J1/00B21J1/06B21J5/00B21K29/00
CPCB21J1/00B21J1/06B21J5/002B21K29/00C21D8/005C22C38/02C22C38/04C22C38/58C23G1/08
Inventor 肖松谢其军
Owner SHANGHAI WINKELMANN LONGCHUAN (SWL) MOTORCOMPONENTS CO LTD