Manufacturing method of high-temperature high-pressure large-aperture piston ring
A high-temperature, high-pressure, manufacturing method technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem of not being suitable for piston rings, etc., and achieve the effect of long service life and stable performance
Active Publication Date: 2014-08-27
浙江高中压阀门有限公司
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Problems solved by technology
[0003] At present, there is no piston ring suitable for use in large cylinders of large aircraft test benches in China
Method used
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[0017] The manufacturing steps of high temperature and high pressure large diameter piston ring are as follows:
[0018] 1) Select the nickel-based deformed superalloy GH4145 as the base material for manufacturing the piston ring to make the piston ring, and the diameter of the piston ring is about 445mm;
[0019] 2) Vacuum heat the piston ring with a furnace (vacuum degree is 1×10 -3 -10 -4 ), heated for 6-8 hours in the temperature range of 100°C (627-727°C) below 727°C required for the internal structure of the piston ring to change;
[0020] 3) In a vacuum state (the vacuum degree is 1×10 -3 -10 -4 ), bombard the surface of the piston ring with nitrogen positive ions for 5-7h to form a nitride layer of 6-7u, making the surface hardness of the piston ring above HRC65;
[0021] 4) The entire piston ring is cooled with the furnace. The cooling range of the furnace is 20-50°C / h, and the cooling time is about 17h to prevent the surface of the piston ring from bursting. cut...
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Abstract
The manufacturing of a piston ring, particularly a high-temperature high-pressure large-aperture piston ring, is a problem in the manufacturing of an engine all the time. No piston ring which is suitable for being used in a large cylinder of a test bed of a large airplane is available domestically at present. The invention discloses a manufacturing method of the high-temperature high-pressure large-aperture piston ring. The manufacturing method comprises the following steps of: (1) selecting nickel-based wrought high-temperature alloy as a base material for manufacturing the piston ring and manufacturing into the piston ring, wherein the diameter of the piston ring is 400-600 mm; (2) performing vacuum heating on the piston ring by using a furnace and heating in a range of 100 DEG C below the temperature of 727 DEG C for 6-8 hours; (3) bombarding the surface of the piston ring with positive ions of nitrogen in a vacuum state for 5-7 hours to form a nitride layer; and (4) cooling the entire piston ring along with the furnace, wherein the cooling amplitude of the furnace is 20-50 DEG C / h and the discharge temperature is 240-260 DEG C. The piston ring manufactured by the invention can fully adapt to use in the large cylinder of the test bed of the large airplane and has stable performance and long service life.
Description
technical field [0001] The invention relates to the field of seals, in particular to a method for manufacturing a high-temperature, high-pressure and large-diameter piston ring. Background technique [0002] The manufacture of piston rings has always been a difficult problem in engine manufacturing, especially high-temperature, high-pressure and large-diameter piston rings. At present, the diameter of the largest piston ring in the cylinder of automobiles and ships in my country is only 400mm, and the temperature is below 600°C. The large cylinder piston ring used in the large aircraft test bench has a size of about 445mm, and its technical requirements are: to work under high temperature and high pressure, the temperature reaches 1000K (727°C), the pressure is 24Mpa, there is no lubricant, and no lubricant can be added. ; Requires a certain toughness and elasticity, that is, the hot gas in the diversion cylinder; the surface must be wear-resistant and scratch-resistant und...
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IPC IPC(8): C23C8/38
Inventor 文体杰章贤根朱郁玮
Owner 浙江高中压阀门有限公司