CN103938235B - The asymmetric chrome-plated process of steel piston annular groove - Google Patents
The asymmetric chrome-plated process of steel piston annular groove Download PDFInfo
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- CN103938235B CN103938235B CN201410176424.3A CN201410176424A CN103938235B CN 103938235 B CN103938235 B CN 103938235B CN 201410176424 A CN201410176424 A CN 201410176424A CN 103938235 B CN103938235 B CN 103938235B
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Abstract
The invention discloses the asymmetric chrome-plated process of a kind of steel piston annular groove, comprise the steps: Pre-treatment before plating; Insulating tape is put between positive plate and piston ring groove bottom footpath, prevents piston ring groove bottom footpath by chromium plating, insulation protection is carried out to the non-chromium plating position of piston; Piston is loaded onto plating axle; Positive plate is put into piston ring groove, guarantees that it is correct at annular groove camber, position centering; Enter groove preheating; Etching; The steps such as chromium plating.By the application of the asymmetric chrome-plated process of steel piston annular groove of the present invention, annular groove lower planes layers of chrome can be utilized fully, and electroplating time can shorten about 20%, and cost is also proportional to successively decrease.
Description
Technical field
The present invention relates to a kind of surface of piston ring groove treatment technology being 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 reciprocatory movement 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 uneven, be subject to the effect of power, fast often than upper surface wear of the lower plane of piston ring groove, when the wearing and tearing of annular groove lower plane layers of chrome reach capacity, piston don't fail to place under repair, adopt asymmetric chrome-plated process, while guarantee piston work-ing life, effectively can reduce electroplating cost.
Summary of the invention
Goal of the invention: the present invention is directed to deficiency, proposes a kind of asymmetric chrome-plated process of steel piston annular groove that effectively can 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 cleaning to remove greasy dirt and the impurity of piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents piston ring groove bottom footpath by chromium plating, insulation protection is carried out to the non-chromium plating position of piston;
(3) piston is loaded onto 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, positive plate is made to be partial to annular groove lower plane;
(5) groove preheating is entered: put into plating solution post-heating piston to electroplating temperature 45-60 DEG C, the time is no less than 20 minutes;
(6) etch;
(7) chromium plating;
(8) after chromium plating terminates, plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, rinses out whole chromic acid residue with water.
As preferably, step (5) described solution composition: chromic anhydride CrO3230 ~ 285g/L, sulfuric acid H2SO41.5 ~ 2.7g/L, trivalent chromium Cr3+2 ~ 8.2g/L.
As preferably, the current density of step (6) described etching is 25-40A/dm2, and temperature is 45-60 DEG C, and voltage is 4-6V, and the time is 10-20 minute.
As preferably, in step (7) described chromium plating, current density is 20-45A/dm2, and temperature is 45-60 DEG C, voltage is 4-6V, time, according to annular groove light car size and standard-sized difference, after calculating layers of chrome top and bottom thickness average value, 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, annular groove lower planes layers of chrome can be utilized fully, and electroplating time can shorten about 20%, and cost is also proportional to successively decrease.
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 cleaning to remove greasy dirt and the impurity of piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents piston ring groove bottom footpath by chromium plating, insulation protection is carried out to the non-chromium plating position of piston;
(3) piston is loaded onto 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, positive plate is made to be partial to annular groove lower plane;
(5) enter groove preheating: put into plating solution, solution composition: chromic anhydride CrO3230g/L, sulfuric acid H2SO41.52.7g/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) etch: current density is 25A/dm2, and 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, after calculating layers of chrome top and bottom thickness average value, calculates electroplating time by the speed of growth of 0.01mm/h;
(8) after chromium plating terminates, plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, rinses out whole chromic acid residue with water.
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 cleaning to remove greasy dirt and the impurity of piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents piston ring groove bottom footpath by chromium plating, insulation protection is carried out to the non-chromium plating position of piston;
(3) piston is loaded onto 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, positive plate is made to be partial to annular groove lower plane;
(5) enter groove preheating: put into plating solution, solution composition: chromic anhydride CrO3285g/L, sulfuric acid H2SO42.7g/L, trivalent chromium Cr3+8.2g/L, heating piston is to electroplating temperature 60 DEG C, and the time is no less than 20 minutes;
(6) etch: current density is 40A/dm2, and temperature is 60 DEG C, and voltage is 6V, and the time is 20 minutes;
(7) chromium plating: current density is 45A/dm2, temperature is 60 DEG C, and voltage is 6V, and the time, according to annular groove light car size and standard-sized difference, after calculating layers of chrome top and bottom thickness average value, calculates electroplating time by the speed of growth of 0.01mm/h;
(8) after chromium plating terminates, plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, rinses out whole chromic acid residue with water.
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 cleaning to remove greasy dirt and the impurity of piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents piston ring groove bottom footpath by chromium plating, insulation protection is carried out to the non-chromium plating position of piston;
(3) piston is loaded onto 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, positive plate is made to be partial to annular groove lower plane;
(5) enter groove preheating: put into plating solution, solution composition: chromic anhydride CrO3260g/L, sulfuric acid H2SO42.1g/L, trivalent chromium Cr3+5g/L, heating piston is to electroplating temperature 55 DEG C, and the time is no less than 20 minutes;
(6) etch: current density is 35A/dm2, and temperature is 55 DEG C, and voltage is 5V, and the time is 15 minutes;
(7) chromium plating: current density is 30A/dm2, temperature is 55 DEG C, and voltage is 5V, and the time, according to annular groove light car size and standard-sized difference, after calculating layers of chrome top and bottom thickness average value, calculates electroplating time by the speed of growth of 0.01mm/h;
(8) after chromium plating terminates, plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, rinses out whole chromic acid residue with water.
Claims (3)
1. the asymmetric chrome-plated process of steel piston annular groove, comprises following several step:
(1) Pre-treatment before plating: adopt alcohol or acetone cleaning to remove greasy dirt and the impurity of piston face;
(2) insulating tape is put between positive plate and piston ring groove bottom footpath, prevents piston ring groove bottom footpath by chromium plating, insulation protection is carried out to the non-chromium plating position of piston;
(3) piston is loaded onto 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, positive plate is made to be partial to annular groove lower plane;
(5) groove preheating is entered: put into plating solution post-heating piston to electroplating temperature 45-60 DEG C, the time is no less than 20 minutes;
(6) etch, the current density of described etching is 25-40A/dm
2, temperature is 45-60 DEG C, and voltage is 4-6V, and the time is 10-20 minute;
(7) chromium plating;
(8) after chromium plating terminates, plating solution of draining, hangs out piston, pulls down web member and all adhesive tapes, rinses out whole chromic acid residue with water.
2. the asymmetric chrome-plated process of a kind of steel piston annular groove according to claim 1, is characterized in that: step (5) described solution composition: chromic anhydride CrO
3230 ~ 285g/L, sulfuric acid H
2sO
41.5 ~ 2.7g/L, trivalent chromium Cr
3+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: in step (7) described chromium plating, current density is 20-45A/dm
2, temperature is 45-60 DEG C, and voltage is 4-6V, and the time, according to annular groove light car size and standard-sized difference, after calculating layers of chrome top and bottom thickness average value, calculates 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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| 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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| US8057644B2 (en) * | 2005-07-26 | 2011-11-15 | Federal-Mogul World Wide, Inc. | Process and apparatus for plating articles |
| CN101328603B (en) * | 2008-07-28 | 2010-07-14 | 魏青松 | Galvanic deposit chromium-based two-component particle composite reinforced surface treating piston ring and production method thereof |
| CN101343768B (en) * | 2008-08-18 | 2010-08-25 | 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 |
| CN103403229B (en) * | 2010-12-27 | 2016-05-25 | 日本活塞环株式会社 | Composite chrome plating overlay film and use the slide unit of this overlay 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 |
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