CN102618818B - Manufacturing method of high-temperature high-pressure large-aperture piston ring - Google Patents
Manufacturing method of high-temperature high-pressure large-aperture piston ring Download PDFInfo
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- CN102618818B CN102618818B CN201210077523.7A CN201210077523A CN102618818B CN 102618818 B CN102618818 B CN 102618818B CN 201210077523 A CN201210077523 A CN 201210077523A CN 102618818 B CN102618818 B CN 102618818B
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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
The present invention relates to sealing member field, specifically a kind of manufacture method of high temperature high pressure large caliber piston ring.
Background technology
The making of piston ring is a difficult problem, especially the high temperature high pressure large caliber piston ring that engine is manufactured always.At present, the piston ring diameter of China's automobile, steamer cylinder maximum only has 400mm, and temperature is below 600 ℃.And for the large cylinder piston ring of large aircraft testing platform, be of a size of 445mm left and right, its technical requirements is: under High Temperature High Pressure, work, temperature reaches 1000K(727 ℃), pressure is 24Mpa, there is no lubricant, can not add lubricant; Requirement has certain toughness and elasticity, i.e. red-hot gas in water conservancy diversion cylinder; The necessary wear-resisting resistance to scratch of high temperature lower surface, and have certain hardness.
The current domestic piston ring not also being suitable in the large cylinder of large aircraft testing platform.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defect that above-mentioned prior art exists, and a kind of manufacture method of high temperature high pressure large caliber piston ring is provided, and the piston ring that its manufacture obtains is applicable in the large cylinder of large aircraft testing platform.
For this reason, the present invention adopts following technical scheme: the manufacture method of high temperature high pressure large caliber piston ring, and its step is as follows:
1) select ni-base wrought superalloy as the base material of manufacturing piston ring, make piston ring, the diameter of piston ring is 400-600mm;
2) with stove, piston ring is carried out to heating under vacuum, (627-727 ℃) 6-8h that heats within the scope of 100 ℃ below 727 ℃ of temperature (temperature that interior tissue changes), be ageing strengthening, for improving piston ring internal toughness and elasticity, prevent that piston ring from adding thermal distortion;
3) under vacuum state, with the surperficial 5-7h of the positive ion bombardment piston ring of nitrogen, form nitride layer, make more than the surface hardness of piston ring reaches HRC65,, in the situation that High Temperature High Pressure does not have lubricant, to still have very strong resistance to scratch ability;
4) whole piston ring furnace cooling, the cooling extent of stove is 20-50 ℃/h, prevents piston ring surface explosion, and tapping temperature is 240-260 ℃, and the piston ring mechanical property obtaining while coming out of the stove is to pull open the mouth L of incision
max=π (φ 1-φ 2)
+(1-3) mm, in formula, φ 1 represents the external diameter of piston ring, φ 2 represents the internal diameter of piston ring.The described mouth L that pulls open incision
maxcan effectively guarantee after piston ring propelling piston groove, to return to the original form rapidly.
Ni-base wrought superalloy is to take the wrought superalloy that nickel is main matrix composition, has higher intensity and good anti-oxidant, resistance to combustion gas corrosion ability within the scope of 650～1000 ℃.
As preferably, described ni-base wrought superalloy is selected GH4145 or the GH145(U.S. trade mark: InconelX-750, the German trade mark: NiCr15Fe7TiAl, and the French trade mark: NC15FeTNbA, the Japanese trade mark: NCF750).GH145 alloy is mainly the nickel base superalloy that carries out mutually ageing strengthening with γ ' [Ni3 (Al, Ti, Nb)], at 980 ℃, there is below good corrosion-resistant and antioxidant property, 800 ℃ have higher intensity below, 540 ℃ have good resistance to relaxation property below, also have good forming property and welding property simultaneously.
As preferably, the vacuum tightness adopting during vacuum is 1 * 10
-3-10
-4.
As preferably, the thickness of described nitride layer is 6-7u.
The piston ring that manufacture of the present invention obtains, can be applicable in the large cylinder of large aircraft testing platform stable performance, long service life completely.
Below in conjunction with specification drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is schematic diagram before and after mouth that piston ring of the present invention cuts pulls open (solid line represent to pull open before, after dotted line represents to pull open).
Embodiment
The manufacturing step of high temperature high pressure large caliber piston ring is as follows:
1) select ni-base wrought superalloy GH4145 as the base material of manufacturing piston ring, make piston ring, the diameter of piston ring is 445mm left and right;
2) (vacuum tightness is 1 * 10 with stove, piston ring to be carried out to heating under vacuum
-3-10
-4), (627-727 ℃) 6-8h that heats within the scope of piston ring interior tissue changes temperature required below 727 ℃ 100 ℃;
3) under vacuum state, (vacuum tightness is 1 * 10
-3-10
-4), with the surperficial 5-7h of the positive ion bombardment piston ring of nitrogen, form nitride layer 6-7u, make more than the surface hardness of piston ring reaches HRC65;
4) whole piston ring furnace cooling, the cooling extent of stove is 20-50 ℃/h, and temperature fall time is 17h left and right, prevents piston ring surface explosion, and tapping temperature is 250 ℃, and the piston ring mechanical property obtaining while coming out of the stove is to pull open the mouth L of incision
max=π (φ 1-φ 2) mm, as shown in Figure 1, in formula, φ 1 represents the external diameter of piston ring, φ 2 represents the internal diameter of piston ring.
Claims (2)
1. the manufacture method of high temperature high pressure large caliber piston ring, its step is as follows:
1) select ni-base wrought superalloy as the base material of manufacturing piston ring, make piston ring, the diameter of piston ring is 400-600mm;
2) with stove, piston ring is carried out to heating under vacuum, 6-8h heats within the scope of 100 ℃ in temperature below 727 ℃;
3), under vacuum state, with the surperficial 5-7h of the positive ion bombardment piston ring of nitrogen, form nitride layer;
4) whole piston ring furnace cooling, the cooling extent of stove is 20-50 ℃/h, and tapping temperature is 240-260 ℃, and the piston ring mechanical property obtaining while coming out of the stove is to pull open the mouth L of incision
max=π (φ 1-φ 2)
+(1-3) mm, in formula, φ 1 represents the external diameter of piston ring, φ 2 represents the internal diameter of piston ring.
2. the manufacture method of high temperature high pressure large caliber piston ring according to claim 1, is characterized in that described ni-base wrought superalloy selects GH4145.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210077523.7A CN102618818B (en) | 2012-03-21 | 2012-03-21 | Manufacturing method of high-temperature high-pressure large-aperture piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210077523.7A CN102618818B (en) | 2012-03-21 | 2012-03-21 | Manufacturing method of high-temperature high-pressure large-aperture piston ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102618818A CN102618818A (en) | 2012-08-01 |
| CN102618818B true CN102618818B (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210077523.7A Active CN102618818B (en) | 2012-03-21 | 2012-03-21 | Manufacturing method of high-temperature high-pressure large-aperture piston ring |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013010807A1 (en) * | 2013-06-27 | 2014-12-31 | Liebherr-Aerospace Lindenberg Gmbh | Component of an aircraft |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410688A (en) * | 2002-09-19 | 2003-04-16 | 东方汽轮机厂 | High temperature alloy spring for steam turbine steam locking and its processing method and detecting installation |
| US8075839B2 (en) * | 2006-09-15 | 2011-12-13 | Haynes International, Inc. | Cobalt-chromium-iron-nickel alloys amenable to nitride strengthening |
| CN201546834U (en) * | 2009-07-18 | 2010-08-11 | 安庆帝伯格茨活塞环有限公司 | Plasma nitriding piston ring |
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- 2012-03-21 CN CN201210077523.7A patent/CN102618818B/en active Active
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Denomination of invention: Manufacturing method of high temperature and high pressure large diameter piston ring Effective date of registration: 20220118 Granted publication date: 20140827 Pledgee: Zhejiang Tailong Commercial Bank Co.,Ltd. Hangzhou Lin'an sub branch Pledgor: ZHEJIANG HIGH AND MIDDLE PRESSURE VALVE Co.,Ltd. Registration number: Y2022330000108 |