CN103938235A - Asymmetric chromium plating process for steel piston ring groove - Google Patents
Asymmetric chromium plating process for steel piston ring groove Download PDFInfo
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- CN103938235A CN103938235A CN201410176424.3A CN201410176424A CN103938235A CN 103938235 A CN103938235 A CN 103938235A CN 201410176424 A CN201410176424 A CN 201410176424A CN 103938235 A CN103938235 A CN 103938235A
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- piston
- ring groove
- piston ring
- annular groove
- chromium
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Abstract
The invention discloses an asymmetric chromium plating process for a steel piston ring groove. The asymmetric chromium plating process for the steel piston ring groove comprises the following steps: pretreating before plating; placing an insulating tape between an anode plate and bottom diameter of the piston ring groove, so that the bottom diameter of the piston ring groove is prevented from being plated with chromium, and insulation protection is carried out on a non chromium plating part of a piston; mounting the piston on an electroplating shaft; placing the anode plate into the piston ring groove, wherein correct height and centered position of the anode plate in the piston ring groove must be guaranteed; preheating in the piston ring groove; etching; plating chromium. By applying the asymmetric chromium plating process for the steel piston ring groove, chromium layers on the upper plane and the lower plane of the piston ring groove can be fully utilized, electroplating time can be shortened by about 20%, and cost is also proportionally decreased.
Description
Technical field
The present invention relates to a kind of surface of piston ring groove treatment technology that is mainly used in boats and ships, automobile, mechanical means, be specifically related to the asymmetric chrome-plated process of a kind of steel piston annular groove.
Background technology
In the upper and lower to-and-fro movement process of piston, piston ring is ramming piston annular groove constantly, causes the wearing and tearing of annular groove plane.But this wearing and tearing are normally inhomogeneous, be subject to the effect of power, often fast than upper surface wear of the lower plane of piston ring groove, in the time that the wearing and tearing of annular groove lower plane chromium layer reach capacity, piston don't fail to place under repair, adopt asymmetric chrome-plated process, in ensureing piston work-ing life, can effectively reduce electroplating cost.
Summary of the invention
Goal of the invention: the present invention is directed to deficiency, propose a kind of asymmetric chrome-plated process of steel piston annular groove that can effectively improve electroplating time, reduce cost.
Technical scheme: the asymmetric chrome-plated process of a kind of steel piston annular groove of the present invention, comprises following several step:
(1) Pre-treatment before plating: adopt alcohol or acetone to clean greasy dirt and the impurity of removing piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents that piston ring groove bottom footpath is by chromium plating, insulation protection is carried out in the non-chromium plating of piston position;
(3) piston is loaded onto to plating axle, the concentricity of piston is adjusted in school, makes it degree of eccentricity and is not more than 0.1mm;
(4) positive plate is put into piston ring groove, guarantee that it is correct at annular groove camber, position centering; According to the different requirements of annular groove top and bottom thickness, by the gauge of thickness proportion processing positive plate insulation grain, make positive plate deflection annular groove lower plane;
(5) enter groove preheating: put into plating solution post-heating piston to electroplating temperature 45-60 DEG C, the time is no less than 20 minutes;
(6) etching;
(7) chromium plating;
(8) after chromium plating finishes, the plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, and water rinses out whole chromic acid residues.
As preferably, the described solution composition of step (5): chromic anhydride CrO3 230～285g/L, sulfuric acid H2SO4 1.5～2.7g/L, trivalent chromium Cr3+ 2～8.2g/L.
As preferably, the current density of the described etching of step (6) is 25-40 A/dm2, and temperature is 45-60 DEG C, and voltage is 4-6V, and the time is 10-20 minute.
As preferably, in the described chromium plating of step (7), current density is 20-45 A/dm2, and temperature is 45-60 DEG C, voltage is 4-6V, time, according to annular groove light car size and standard-sized difference, calculates after the thickness average value of chromium layer top and bottom, calculates electroplating time by the speed of growth of 0.01mm/h.
Beneficial effect: by the application of the asymmetric chrome-plated process of steel piston annular groove of the present invention, lower plane chromium layer on annular groove can be utilized fully, electroplating time can shorten 20% left and right, and cost is proportional successively decreasing also.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
The asymmetric chrome-plated process of a kind of steel piston annular groove, comprises following several step:
(1) Pre-treatment before plating: adopt alcohol or acetone to clean greasy dirt and the impurity of removing piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents that piston ring groove bottom footpath is by chromium plating, insulation protection is carried out in the non-chromium plating of piston position;
(3) piston is loaded onto to plating axle, the concentricity of piston is adjusted in school, makes it degree of eccentricity and is not more than 0.1mm;
(4) positive plate is put into piston ring groove, guarantee that it is correct at annular groove camber, position centering; According to the different requirements of annular groove top and bottom thickness, by the gauge of thickness proportion processing positive plate insulation grain, make positive plate deflection annular groove lower plane;
(5) enter groove preheating: put into plating solution, solution composition: chromic anhydride CrO3 230g/L, sulfuric acid H2SO4 1.5 2.7g/L, trivalent chromium Cr3+ 2g/L, heating piston is to electroplating temperature 45-60 DEG C, and the time is no less than 20 minutes;
(6) etching: current density is 25A/dm2, temperature is 45 DEG C, and voltage is 4V, and the time is 10 minutes;
(7) chromium plating: current density is 20A/dm2, temperature is 45 DEG C, and voltage is 4V, and the time, according to annular groove light car size and standard-sized difference, calculates after the thickness average value of chromium layer top and bottom, calculates electroplating time by the speed of growth of 0.01mm/h;
(8) after chromium plating finishes, the plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, and water rinses out whole chromic acid residues.
Embodiment 2
The asymmetric chrome-plated process of a kind of steel piston annular groove, comprises following several step:
(1) Pre-treatment before plating: adopt alcohol or acetone to clean greasy dirt and the impurity of removing piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents that piston ring groove bottom footpath is by chromium plating, insulation protection is carried out in the non-chromium plating of piston position;
(3) piston is loaded onto to plating axle, the concentricity of piston is adjusted in school, makes it degree of eccentricity and is not more than 0.1mm;
(4) positive plate is put into piston ring groove, guarantee that it is correct at annular groove camber, position centering; According to the different requirements of annular groove top and bottom thickness, by the gauge of thickness proportion processing positive plate insulation grain, make positive plate deflection annular groove lower plane;
(5) enter groove preheating: put into plating solution, solution composition: chromic anhydride CrO3 285g/L, sulfuric acid H2SO4 2.7g/L, trivalent chromium Cr3+ 8.2g/L, heating piston is to 60 DEG C of electroplating temperatures, and the time is no less than 20 minutes;
(6) etching: current density is 40 A/dm2, temperature is 60 DEG C, and voltage is 6V, and the time is 20 minutes;
(7) chromium plating: current density is 45 A/dm2, temperature is 60 DEG C, and voltage is 6V, and the time, according to annular groove light car size and standard-sized difference, calculates after the thickness average value of chromium layer top and bottom, calculates electroplating time by the speed of growth of 0.01mm/h;
(8) after chromium plating finishes, the plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, and water rinses out whole chromic acid residues.
Embodiment 3
The asymmetric chrome-plated process of a kind of steel piston annular groove, comprises following several step:
(1) Pre-treatment before plating: adopt alcohol or acetone to clean greasy dirt and the impurity of removing piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents that piston ring groove bottom footpath is by chromium plating, insulation protection is carried out in the non-chromium plating of piston position;
(3) piston is loaded onto to plating axle, the concentricity of piston is adjusted in school, makes it degree of eccentricity and is not more than 0.1mm;
(4) positive plate is put into piston ring groove, guarantee that it is correct at annular groove camber, position centering; According to the different requirements of annular groove top and bottom thickness, by the gauge of thickness proportion processing positive plate insulation grain, make positive plate deflection annular groove lower plane;
(5) enter groove preheating: put into plating solution, solution composition: chromic anhydride CrO3 260g/L, sulfuric acid H2SO4 2.1g/L, trivalent chromium Cr3+ 5g/L, heating piston is to 55 DEG C of electroplating temperatures, and the time is no less than 20 minutes;
(6) etching: current density is 35 A/dm2, temperature is 55 DEG C, and voltage is 5V, and the time is 15 minutes;
(7) chromium plating: current density is 30 A/dm2, temperature is 55 DEG C, and voltage is 5V, and the time, according to annular groove light car size and standard-sized difference, calculates after the thickness average value of chromium layer top and bottom, calculates electroplating time by the speed of growth of 0.01mm/h;
(8) after chromium plating finishes, the plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, and water rinses out whole chromic acid residues.
Claims (4)
1. the asymmetric chrome-plated process of steel piston annular groove, comprises following several step:
(1) Pre-treatment before plating: adopt alcohol or acetone to clean greasy dirt and the impurity of removing piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents that piston ring groove bottom footpath is by chromium plating, insulation protection is carried out in the non-chromium plating of piston position;
(3) piston is loaded onto to plating axle, the concentricity of piston is adjusted in school, makes it degree of eccentricity and is not more than 0.1mm;
(4) positive plate is put into piston ring groove, guarantee that it is correct at annular groove camber, position centering; According to the different requirements of annular groove top and bottom thickness, by the gauge of thickness proportion processing positive plate insulation grain, make positive plate deflection annular groove lower plane;
(5) enter groove preheating: put into plating solution post-heating piston to electroplating temperature 45-60 DEG C, the time is no less than 20 minutes;
(6) etching;
(7) chromium plating;
(8) after chromium plating finishes, the plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, and water rinses out whole chromic acid residues.
2. the asymmetric chrome-plated process of a kind of steel piston annular groove according to claim 1, is characterized in that: the described solution composition of step (5): chromic anhydride CrO3 230～285g/L, sulfuric acid H2SO4 1.5～2.7g/L, trivalent chromium Cr3+ 2～8.2g/L.
3. the asymmetric chrome-plated process of a kind of steel piston annular groove according to claim 1, is characterized in that: the current density of the described etching of step (6) is 25-40 A/dm2, and temperature is 45-60 DEG C, and voltage is 4-6V, and the time is 10-20 minute.
4. the asymmetric chrome-plated process of a kind of steel piston annular groove according to claim 1, it is characterized in that: in the described chromium plating of step (7), current density is 20-45 A/dm2, temperature is 45-60 DEG C, voltage is 4-6V, time is according to annular groove light car size and standard-sized difference, calculate after the thickness average value of chromium layer top and bottom, calculate electroplating time by the speed of growth of 0.01mm/h.
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| CN201410176424.3A CN103938235B (en) | 2014-04-29 | 2014-04-29 | The asymmetric chrome-plated process of steel piston annular groove |
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| CN201410176424.3A CN103938235B (en) | 2014-04-29 | 2014-04-29 | The asymmetric chrome-plated process of steel piston annular groove |
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| CN103938235B CN103938235B (en) | 2016-04-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404585A (en) * | 2014-11-18 | 2015-03-11 | 苏州铜盟电气有限公司 | High-performance multi-azimuth silver pulse rack plating production technology |
| CN104975329A (en) * | 2015-07-15 | 2015-10-14 | 江西洪都航空工业集团有限责任公司 | Improvement method of empennage part tool |
| CN105821454A (en) * | 2015-01-07 | 2016-08-03 | 哈尔滨飞机工业集团有限责任公司 | Control lever surface protection method |
| CN115058758A (en) * | 2022-07-12 | 2022-09-16 | 大连迪施船机有限公司 | Hard chromium electroplating device for marine main engine piston ring groove, working method and process |
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| CN101328603A (en) * | 2008-07-28 | 2008-12-24 | 魏青松 | Galvanic deposit chromium-based two-component particle composite reinforced surface treating piston ring and production method thereof |
| CN101343768A (en) * | 2008-08-18 | 2009-01-14 | 南京飞燕活塞环股份有限公司 | Functional end face chromium plating method for piston ring and special jig |
| US20090301892A1 (en) * | 2005-07-26 | 2009-12-10 | Toth James R | Process and apparatus for plating articles |
| CN202482478U (en) * | 2011-12-31 | 2012-10-10 | 大连迪施船机有限公司 | Electroplating tooling equipment for piston head of marine diesel engine |
| CN103403229A (en) * | 2010-12-27 | 2013-11-20 | 日本活塞环株式会社 | Composite chromium plating film, and sliding member equipped with the film |
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2014
- 2014-04-29 CN CN201410176424.3A patent/CN103938235B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090301892A1 (en) * | 2005-07-26 | 2009-12-10 | Toth James R | Process and apparatus for plating articles |
| CN101328603A (en) * | 2008-07-28 | 2008-12-24 | 魏青松 | Galvanic deposit chromium-based two-component particle composite reinforced surface treating piston ring and production method thereof |
| CN101343768A (en) * | 2008-08-18 | 2009-01-14 | 南京飞燕活塞环股份有限公司 | Functional end face chromium plating method for piston ring and special jig |
| CN103403229A (en) * | 2010-12-27 | 2013-11-20 | 日本活塞环株式会社 | Composite chromium plating film, and sliding member equipped with the film |
| CN202482478U (en) * | 2011-12-31 | 2012-10-10 | 大连迪施船机有限公司 | Electroplating tooling equipment for piston head of marine diesel engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104404585A (en) * | 2014-11-18 | 2015-03-11 | 苏州铜盟电气有限公司 | High-performance multi-azimuth silver pulse rack plating production technology |
| CN105821454A (en) * | 2015-01-07 | 2016-08-03 | 哈尔滨飞机工业集团有限责任公司 | Control lever surface protection method |
| CN104975329A (en) * | 2015-07-15 | 2015-10-14 | 江西洪都航空工业集团有限责任公司 | Improvement method of empennage part tool |
| CN115058758A (en) * | 2022-07-12 | 2022-09-16 | 大连迪施船机有限公司 | Hard chromium electroplating device for marine main engine piston ring groove, working method and process |
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| CN103938235B (en) | 2016-04-27 |
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