CN103014609A - Aluminizing liquid and aluminizing method adopting same to prepare inlaid ring - Google Patents
Aluminizing liquid and aluminizing method adopting same to prepare inlaid ring Download PDFInfo
- Publication number
- CN103014609A CN103014609A CN2012105593466A CN201210559346A CN103014609A CN 103014609 A CN103014609 A CN 103014609A CN 2012105593466 A CN2012105593466 A CN 2012105593466A CN 201210559346 A CN201210559346 A CN 201210559346A CN 103014609 A CN103014609 A CN 103014609A
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- Prior art keywords
- liquid
- aluminising
- aluminizing
- edge circle
- edge
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- 239000007788 liquid Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005269 aluminizing Methods 0.000 title abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 16
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 13
- 230000001788 irregular Effects 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 14
- 238000009792 diffusion process Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910001338 liquidmetal Inorganic materials 0.000 abstract description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 230000003197 catalytic effect Effects 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 21
- 229910001018 Cast iron Inorganic materials 0.000 description 15
- 229910052759 nickel Inorganic materials 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910000838 Al alloy Inorganic materials 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 6
- 229910052746 lanthanum Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- 229910018084 Al-Fe Inorganic materials 0.000 description 1
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018192 Al—Fe Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 238000006424 Flood reaction Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical group [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses aluminizing liquid and an aluminizing process adopting the same to prepare an inlaid ring. The aluminizing liquid comprises the components in percentage by weight: 0.1-2.0 percent of rare earth La, 6.0-13 percent of Si, Xi 0.7 percent of Fe, and the balance of Al. The aluminizing process comprises the following steps: immersing a clean inlaid ring into the aluminizing liquid, wherein the temperature of the aluminizing liquid is controlled to be within 710-750 DEG C; and enabling the inlaid ring to perform irregular reciprocating motion in the aluminizing liquid, taking the inlaid ring out after a preset time, and quickly transferring the inlaid ring to a positioning support block. Compared with the prior art, the aluminizing liquid provided by the invention can improve the adhesiveness between aluminizing liquid metal and a basal body, improves the fluidity and wettability of the aluminum liquid, has catalytic effect, and enhances diffusion of aluminum atoms to the inlaid ring so as to enable a diffusion layer to be more complete. The aluminizing process provided by the invention can greatly reduce production cost; meanwhile, the process is simple, the operation is convenient, and the industrial production is easy to realize.
Description
Technical field
The present invention relates to a kind of aluminising liquid and a kind of alumetizing process.
Background technology
Eutectic Al-Si piston alloy average abrasion speed is 0.03-0.08mm/1000h, and along with emission request is more and more higher, the reinforcement of oil engine is further strengthened, and the wear resistance of piston ring groove can not meet the demands.In order to improve the wear resistance of aluminum piston ring groove, generally adopt at present piston first annular groove to adopt high-nickel austenitic cast iron abrasion-proof inserted ring structure, this structure not only keeps the light characteristics of aluminium piston weight, and has the wear-resisting character of cast-iron piston annular groove, the work-ing life of greatly having improved annular groove.In order to guarantee to reach metallurgical binding between high-nickel austenitic cast iron abrasion-proof inserted ring and the piston aluminum substrate, generally adopt at present the Al-Fin method to produce, so-called Al-Fin method is exactly that the high-nickel austenitic cast iron abrasion-proof inserted ring that surface quality is qualified floods skim aluminium in the aluminising liquid of certain temperature certain ingredients, then puts into the again process of cast aluminum aluminium alloy acquisition Al-Fe composite casting product of casting mold.In high-nickel austenitic cast iron abrasion-proof inserted ring castingin process, follow the diffusion reaction of liquid-solid two kinds of metallic substance, form certain thickness alloy diffusion layer at the high-nickel austenitic cast iron abrasion-proof inserted ring, make the land between high-nickel austenitic cast iron abrasion-proof inserted ring and the matrix have good thermal conductivity and enough cohesive strengths.
Because the high-nickel austenitic cast iron abrasion-proof inserted ring and the aluminium alloy body that embed are two kinds of diverse materials, properties differs greatly, add upper piston easily oxidized, aluminising be not thorough etc. on the Xiang Quan top layer in castingprocesses factor affecting, cause iron aluminium tack coat be highly brittle weak, have stress and do not possess the defectives such as extension, these defectives will cause the loosening or cracking of edge circle in the piston use procedure, cause piston ring packing bad, oil consumption is increased, motor efficiency reduces, even because poor thermal conductivity causes local superheating even molten top.How the high-nickel austenitic cast iron abrasion-proof inserted ring is mounted in the aluminium-alloy piston body, make iron, aluminium junction surface bonding securely, and can under rugged environment, work and be unlikely to delamination and lost efficacy, it is the technical barrier that ring-mounted piston is made, therefore, how to improve ferro-aluminum layer bond quality and become piston manufacturing outline.
In the ring-mounted piston preparation process, in order to strengthen the bonding properties of high-nickel austenitic cast iron abrasion-proof inserted ring and aluminum substrate, the special aluminising link of the high-nickel austenitic cast iron abrasion-proof inserted ring being set the certain temperature certain hour before the cast aluminum aluminium alloy.The high-nickel austenitic cast iron abrasion-proof inserted ring infiltrates in the aluminising liquid and is just surrounded by high temperature aluminising liquid, and iron-aluminium atom inter-diffusion reaction occurs at once on its top layer, and the alloy diffusion layer thickness of reaction velocity of diffusion and generation is inversely proportional to.Because aluminising liquid contains multiple element, each element is different on the impact of diffusion layer coarsening rate, therefore, can reach the weave construction of control diffusion layer and the purpose of thickness by the content of each element in the control aluminising liquid.
Summary of the invention
Given this, the object of the invention is to provide a kind of aluminising liquid and the aluminizing method that uses this aluminising liquid for preparing the edge circle aluminium-alloy piston of high bond quality.
For solving above technical problem, technical scheme provided by the invention is, a kind of aluminising liquid is provided, and by weight percentage, its proportioning is: rare earth La: 0.1-2.0%, and Si:6.0 ~ 13%, Fe: ￡ 0.7%, surplus is Al.
Preferably, by weight percentage, its proportioning is: rare earth La: 1.0%, Si:12.05%, and Fe:0.32%, surplus is Al.
Preferably, by weight percentage, its proportioning is: rare earth La: 1.95%, Si:12.88%, and Fe:0.65%, surplus is Al.
Preferably, by weight percentage, its proportioning is: rare earth La: 0.15%, Si:6.24%, and Fe:0.3%, surplus is Al.
The present invention also provides a kind of method of utilizing above-mentioned aluminising liquid to prepare edge circle, and the edge circle of cleaning is immersed in the above-mentioned aluminising liquid, and the temperature of described aluminising liquid is controlled at 710-750 ℃; Make the edge circle in aluminising liquid, do irregular to-and-fro movement, behind Preset Time, take out the edge circle, and promptly it is transferred on the positioning support piece.
Preferably, described Preset Time is 240 ~ 480s.
Preferably, hang over the edge circle of cleaning on the heating resisting metal silk and will inlay circle and immerse in the above-mentioned aluminising liquid, the temperature of this aluminising liquid is 720 ℃, the heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, when reaching 325s, the aluminising time takes out the edge circle with clamp, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.
Preferably, hang over the edge circle of cleaning on the heating resisting metal silk and will inlay circle and immerse in the above-mentioned aluminising liquid, the temperature of this aluminising liquid is 745 ℃, the heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, when reaching 470s, the aluminising time takes out the edge circle with clamp, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.
Preferably, hang over the edge circle of cleaning on the heating resisting metal silk and will inlay circle and immerse in the above-mentioned aluminising liquid, the temperature of this aluminising liquid is 713 ℃, the heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, when reaching 245s, the aluminising time takes out the edge circle with clamp, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.
Compared with prior art, the present invention adds the tackiness that an amount of rare-earth elements of lanthanum can improve aluminising liquid metal and matrix in aluminising liquid, improves the flowability of aluminium liquid, wetting property, have the effect of oozing of urging, strengthen the aluminium atom to the diffusion of edge circle, make diffusion layer more complete; Rare earth improves alloyed layer homogeneity of structure, compactness and plasticity.
Through in aluminising liquid, adding rare-earth elements of lanthanum, increase at the thickness that forms the ferro-aluminum land through the edge circle aluminium-alloy piston for preparing after the follow-up pouring procedure, iron aluminium tack coat bonding strength significantly improves, and has greatly prolonged the work-ing life of this ring-mounted piston.In addition, the adding of aluminising liquid rare earth elements lanthanum can slow down in the piston ring Fe atom to the velocity of diffusion of aluminium liquid, makes aluminising liquid can not exceed standard and change aluminising liquid because of the Fe element, and batch increase of use significantly reduces production costs.Simultaneously, the inventive method is simple, easy to operate, is easy to realize suitability for industrialized production.
Embodiment
Embodiment 1
Ring-mounted piston cast iron loop material is selected austenitic iron, hangs over the edge circle of cleaning on the heating resisting metal silk and will inlay circle to immerse in the aluminising liquid.The composition of aluminising liquid is respectively by weight percentage: rare earth La: 1.0%, Si:12.05%, and Fe:0.32%, surplus is Al.The aluminising temperature is 720 ℃, and the time is 325s.The heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, take out the edge circle with clamp behind the 325s, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.Piston ring is through preparation method chamber die cast-thermal treatment of passing through again conventional ring-mounted piston after the aluminising-machining, the edge circle aluminium-alloy piston of namely making, its ferro-aluminum land cohesive strength is up to 19.56MPa, the high 10.6MPa of cohesive strength than the piston of the aluminising liquid preparation of not adding earth La, and in conjunction with good, the structure observation joint thickness is even through the ultrasound examination bonding surface.
Embodiment 2
Ring-mounted piston cast iron loop material is selected austenitic iron, hangs over the edge circle of cleaning on the heating resisting metal silk and will inlay circle to immerse in the aluminising liquid.The composition of aluminising liquid is respectively by weight percentage: rare earth La: 1.95%, Si:12.88%, and Fe:0.65%, surplus is Al.The aluminising liquid temp is controlled to be 745 ℃, and the aluminising time is 470s.The heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, take out the edge circle with clamp behind the 470s, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.Piston ring is through preparation method chamber die cast-thermal treatment of passing through again conventional ring-mounted piston after the aluminising-machining, i.e. the edge circle aluminium-alloy piston of system, and its ferro-aluminum land cohesive strength is up to 20.56MPa.
Embodiment 3
Ring-mounted piston cast iron loop material is selected austenitic iron, hangs over the edge circle of cleaning on the heating resisting metal silk and will inlay circle to immerse in the aluminising liquid.The composition of aluminising liquid is respectively by weight percentage: rare earth La: 0.15%, Si:6.24%, and Fe:0.3%, surplus is Al.The aluminising liquid temp is controlled to be 713 ℃, and the aluminising time is 245s.The heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, take out the edge circle with clamp behind the 245s, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.Piston ring is through preparation method chamber die cast-thermal treatment of passing through again conventional ring-mounted piston after the aluminising-machining, i.e. the edge circle aluminium-alloy piston of system, and its ferro-aluminum land cohesive strength is up to 17.68MPa.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with the claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. an aluminising liquid is characterized in that, by weight percentage, its proportioning is: rare earth La: 0.1-2.0%, and Si:6.0 ~ 13%, Fe: ￡ 0.7%, surplus is Al.
2. aluminising liquid according to claim 1 is characterized in that, by weight percentage, its proportioning is: rare earth La: 1.0%, Si:12.05%, and Fe:0.32%, surplus is Al.
3. aluminising liquid according to claim 1 is characterized in that, by weight percentage, its proportioning is: rare earth La: 1.95%, Si:12.88%, and Fe:0.65%, surplus is Al.
4. aluminising liquid according to claim 1 is characterized in that, by weight percentage, its proportioning is: rare earth La: 0.15%, Si:6.24%, and Fe:0.3%, surplus is Al.
5. the above described aluminising liquid of arbitrary claim of a utilization prepare method that edge encloses, and it is characterized in that, the edge circle of cleaning is immersed in the above-mentioned aluminising liquid, and the temperature of described aluminising liquid is controlled at 710-750 ℃; Make the edge circle in aluminising liquid, do irregular to-and-fro movement, behind Preset Time, take out the edge circle, and promptly it is transferred on the positioning support piece.
6. aluminising liquid according to claim 5 prepares the method for edge circle, it is characterized in that described Preset Time is 240 ~ 480s.
7. aluminising liquid according to claim 6 prepares the method for edge circle, it is characterized in that, hang over the edge circle of cleaning on the heating resisting metal silk and will inlay circle and immerse in the above-mentioned aluminising liquid, the temperature of this aluminising liquid is 720 ℃, the heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, take out the edge circle with clamp when the aluminising time reaches 325s, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.
8. aluminising liquid according to claim 6 prepares the method for edge circle, it is characterized in that, hang over the edge circle of cleaning on the heating resisting metal silk and will inlay circle and immerse in the above-mentioned aluminising liquid, the temperature of this aluminising liquid is 745 ℃, the heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, take out the edge circle with clamp when the aluminising time reaches 470s, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.
9. aluminising liquid according to claim 6 prepares the method for edge circle, it is characterized in that, hang over the edge circle of cleaning on the heating resisting metal silk and will inlay circle and immerse in the above-mentioned aluminising liquid, the temperature of this aluminising liquid is 713 ℃, the heating resisting metal silk is hung on the eccentric wheel swivel arrangement, make the edge circle in aluminising liquid, do irregular to-and-fro movement, take out the edge circle with clamp when the aluminising time reaches 245s, and on the positioning support piece that is transferred to casting mold of rapidly edge being enclosed the land.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559346.6A CN103014609B (en) | 2012-12-21 | 2012-12-21 | Aluminizing liquid and aluminizing method adopting same to prepare inlaid ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559346.6A CN103014609B (en) | 2012-12-21 | 2012-12-21 | Aluminizing liquid and aluminizing method adopting same to prepare inlaid ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103014609A true CN103014609A (en) | 2013-04-03 |
| CN103014609B CN103014609B (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210559346.6A Expired - Fee Related CN103014609B (en) | 2012-12-21 | 2012-12-21 | Aluminizing liquid and aluminizing method adopting same to prepare inlaid ring |
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| Country | Link |
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| CN (1) | CN103014609B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820751A (en) * | 2014-01-20 | 2014-05-28 | 湖北汽车工业学院 | Activating fluid for treatment before hot aluminizing of ferrous materials and preparation method and use method thereof |
| CN103820752A (en) * | 2014-01-20 | 2014-05-28 | 湖北汽车工业学院 | Activating and alumetizing technology for piston with cast iron inlaid ring and activating process equipment thereof |
| CN105618714A (en) * | 2015-12-30 | 2016-06-01 | 东风商用车有限公司 | Aluminizing and embedding casting process for aluminum-based material |
| CN108660413A (en) * | 2018-05-29 | 2018-10-16 | 佛山市高明利钢精密铸造有限公司 | A kind of manufacturing method of alumetized steel |
| CN111485190A (en) * | 2020-06-05 | 2020-08-04 | 肇庆本田金属有限公司 | Method and device for reducing poor bonding of ring-inlaid piston |
| CN114107886A (en) * | 2021-11-22 | 2022-03-01 | 滨州渤海活塞有限公司 | Automatic ring infiltration device and ring infiltration method |
| CN115466949A (en) * | 2022-09-30 | 2022-12-13 | 成都银河动力有限公司 | Phosphating process for ensuring roughness of piston pin hole to be less than or equal to Ra0.4 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051765A (en) * | 1989-11-12 | 1991-05-29 | 李葵荣 | Rare earth-urge aluminising |
| US20010050122A1 (en) * | 2000-02-07 | 2001-12-13 | Kodak Polychrome Graphics Llc And Mitsubishi Aluminum Co., Ltd. | Aluminum alloy support body for a presensitized plate and method of producing the same |
| CN102560205A (en) * | 2012-01-16 | 2012-07-11 | 于建华 | Aluminizing material of piston inlaid ring and manufacturing method of aluminizing material |
-
2012
- 2012-12-21 CN CN201210559346.6A patent/CN103014609B/en not_active Expired - Fee Related
Patent Citations (3)
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|---|---|---|---|---|
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| US20010050122A1 (en) * | 2000-02-07 | 2001-12-13 | Kodak Polychrome Graphics Llc And Mitsubishi Aluminum Co., Ltd. | Aluminum alloy support body for a presensitized plate and method of producing the same |
| CN102560205A (en) * | 2012-01-16 | 2012-07-11 | 于建华 | Aluminizing material of piston inlaid ring and manufacturing method of aluminizing material |
Non-Patent Citations (3)
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| 孙兰等: "渗铝液Fe含量对镶圈铝合金活塞铝铁结合区的影响", 《粉末冶金材料科学与工程》 * |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103820751A (en) * | 2014-01-20 | 2014-05-28 | 湖北汽车工业学院 | Activating fluid for treatment before hot aluminizing of ferrous materials and preparation method and use method thereof |
| CN103820752A (en) * | 2014-01-20 | 2014-05-28 | 湖北汽车工业学院 | Activating and alumetizing technology for piston with cast iron inlaid ring and activating process equipment thereof |
| CN105618714A (en) * | 2015-12-30 | 2016-06-01 | 东风商用车有限公司 | Aluminizing and embedding casting process for aluminum-based material |
| CN108660413A (en) * | 2018-05-29 | 2018-10-16 | 佛山市高明利钢精密铸造有限公司 | A kind of manufacturing method of alumetized steel |
| CN111485190A (en) * | 2020-06-05 | 2020-08-04 | 肇庆本田金属有限公司 | Method and device for reducing poor bonding of ring-inlaid piston |
| CN114107886A (en) * | 2021-11-22 | 2022-03-01 | 滨州渤海活塞有限公司 | Automatic ring infiltration device and ring infiltration method |
| CN115466949A (en) * | 2022-09-30 | 2022-12-13 | 成都银河动力有限公司 | Phosphating process for ensuring roughness of piston pin hole to be less than or equal to Ra0.4 |
| CN115466949B (en) * | 2022-09-30 | 2023-08-04 | 成都银河动力有限公司 | Phosphating process for ensuring roughness of piston pin hole to be less than or equal to Ra0.4 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103014609B (en) | 2015-04-01 |
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