CN100400814C - Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method - Google Patents
Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method Download PDFInfo
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- CN100400814C CN100400814C CNB2006100485559A CN200610048555A CN100400814C CN 100400814 C CN100400814 C CN 100400814C CN B2006100485559 A CNB2006100485559 A CN B2006100485559A CN 200610048555 A CN200610048555 A CN 200610048555A CN 100400814 C CN100400814 C CN 100400814C
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- water vapour
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Abstract
The inventive surface oxidizing process of a cast-iron exhaust manifold comprises the following steps of putting the work piece in the steam oxidation treatment furnace; switching on the power supply and starting to raising temperature; turning on the nitrogen valve and leading in the nitrogen while raising temperature and meanwhile going on raising temperature; closing the nitrogen when the temperature reaches the setting one and then leading in steam pressure for a certain time; closing steam when the furnace temperature is lowered to the setting one and then opening the furnace lid and lifting the work piece. By using the above process, a compact ferriferrous oxide film is formed on the surface of the cast-iron exhaust manifold.
Description
Technical field
The invention belongs to motor car engine accessory technical field, be specifically related to a kind of process for surface oxidation of cast iron gas exhaust manifold.
Background technique
Existing enmgine exhaust on the market, because the out-of-shape of gas exhaust manifold spare, complex structure, conventional fabrication processes is cylinder iron cast inblock, and the surface treatment method of casting gas exhaust manifold spare adopts traditional rust preventive oil anti-corrosive technology usually, and the conjunction plane of this gas exhaust manifold is not wear-resistant, and because gas exhaust manifold work under bad environment, its rust preventive oil rust-proof life only is 6 months, the easy corrosion of gas exhaust manifold outer wall, and appearance quality is poor.
Summary of the invention
The present invention is directed to the problem that existing cast iron gas exhaust manifold exists, a kind of process for surface oxidation of cast iron gas exhaust manifold is provided, the gas exhaust manifold after oxidation is wear-resisting, corrosion resistance is strong, good airproof performance, reliability height.
For achieving the above object, the technical solution used in the present invention is that this cast iron gas exhaust manifold is to adopt following method to carry out oxidation processes:
1 cleans up the cast iron gas exhaust manifold;
2 are contained in the cast iron gas exhaust manifold in the anchor clamps, and the anchor clamps that workpiece at room temperature will be housed are put into steam oxidation and handled stove;
3 are arranged on the furnace temperature instrument between 300～420 ℃, and opening power begins to heat up, and opens the nitrogen valve gate open and go into nitrogen when heating up, and the feeding speed of nitrogen is 16--20m
3/ h;
4 furnace temperature are incubated 1.5 hours after reaching setting temperature, feed nitrogen in insulation, and feeding nitrogen speed is 16--20m
3/ h;
5 are arranged on the furnace temperature instrument between 630～690 ℃, continue to heat up when keeping nitrogen to feed, and close nitrogen when temperature reaches setting temperature, feed water vapour, and the feeding speed of water vapour is 5 ± 1m
3/ h;
6 remain on the temperature 2.5 hours of setting with furnace temperature, feed water vapour all the time in insulation, and water vapour feeds speed 5 ± 1m
3/ h, and guarantee that all the time stove inner vapor pressure is 14.57～21.46KPa;
7 remain on setting temperature after 2.5 hours with furnace temperature, powered-down, and temperature is reduced to 530～610 ℃ in stove, closes water vapour, opens bell, hangs out workpiece.
Adopt above-mentioned cast iron gas exhaust manifold process for surface oxidation, form the tri-iron tetroxide oxide layer of one deck densification in Cast Iron Surface, this tri-iron tetroxide oxide thickness is 0.015--0.025mm, this oxide layer has wear resistance and stability preferably, therefore, improved the sealing that gas exhaust manifold front and back section cooperates, wear resistance, rustless property and reliability, this technology has replaced traditional rust preventive oil anti-corrosive technology, its antirust time limit was increased to 20 years by 6 months of antirust time limit of rust preventive oil, obviously prolong the rust-proof life of cast iron gas exhaust manifold, also improved the appearance quality of product simultaneously.
Below in conjunction with accompanying drawing specific embodiments of the invention are described in further detail.
Description of drawings
Fig. 1 is the structural representation of cast iron gas exhaust manifold of the present invention.
Fig. 2 is the process for surface oxidation plotted curve of the embodiment of the invention 2
Fig. 3 amplifies 100 times metallography microscope photo for cast iron gas exhaust manifold oxide layer of the present invention
Embodiment
The cast iron gas exhaust manifold comprises gas exhaust manifold body 1 as shown in Figure 1, and oxide layer 2, oxide layer 2 are through the Fe of oxidation processes in its surperficial densification that forms by cast iron gas exhaust manifold body 1
3O
4Patina.
In conjunction with the oxidation curve of cast iron gas exhaust manifold shown in Figure 2, its concrete process for surface oxidation is as follows:
Embodiment 1:
1) the cast iron gas exhaust manifold is cleaned up;
2) workpiece is contained in the anchor clamps, the anchor clamps that workpiece at room temperature will be housed are put into steam oxidation processing stove;
3) the furnace temperature instrument is arranged on 300 ℃, opening power heats up, and opens the nitrogen valve gate open and go into nitrogen when heating up, and the feeding speed of nitrogen is 16m
3/ h;
4) furnace temperature reached behind 300 ℃ of the setting temperatures insulation 1.5 hours, fed nitrogen in insulation, and feeding nitrogen speed is 16m
3/ h;
5) the furnace temperature instrument is arranged on 630 ℃, continues to heat up when keeping nitrogen to feed, close nitrogen when temperature reaches setting temperature, feed water vapour, the feeding speed of water vapour is 5 ± 1m
3(error in dipping of water vapour is ± 1m/h
3/ h);
6) furnace temperature is remained on 630 ℃ of the temperature 2.5 hours of setting, feed water vapour all the time in insulation, water vapour feeds speed 5 ± 1m
3(error in dipping of water vapour is ± 1m/h
3/ h), and guarantee that all the time stove inner vapor pressure is 14.57KPa;
7) furnace temperature is remained on 630 ℃ of setting temperatures after 2.5 hours, powered-down, temperature is reduced to 530 ℃ in stove, closes water vapour, opens bell, hangs out workpiece.
Embodiment 2:
1) the cast iron gas exhaust manifold is cleaned up;
2) workpiece is contained in the anchor clamps, the anchor clamps that workpiece at room temperature will be housed are put into steam oxidation processing stove;
3) the furnace temperature instrument is arranged on 350 ℃, opening power heats up, and opens the nitrogen valve gate open and go into nitrogen when heating up, and the feeding speed of nitrogen is 18m3/h;
4) furnace temperature reached behind 350 ℃ of the setting temperatures insulation 1.5 hours, fed nitrogen in insulation, and feeding nitrogen speed is 18m3/h;
5) the furnace temperature instrument is arranged on 670 ℃, when keeping nitrogen to feed, continues to heat up, when temperature reaches 670 ℃ of setting temperatures, close nitrogen, feed water vapour, the feeding speed of water vapour be 5 ± 1m3/h (error in dipping of water vapour for ± 1m3/h);
6) furnace temperature is remained on 670 ℃ of the temperature 2.5 hours of setting, feed water vapour all the time in insulation, water vapour feeds speed 5 ± 1m
3(error in dipping of water vapour is ± 1m/h
3/ h), and guarantee that all the time stove inner vapor pressure is 17KPa;
7) furnace temperature is remained on 670 ℃ of setting temperatures after 2.5 hours, powered-down, temperature is reduced to 570 ℃ in stove, closes water vapour, opens bell, hangs out workpiece.
Embodiment 3:
1) the cast iron gas exhaust manifold is cleaned up;
2) workpiece is contained in the anchor clamps, the anchor clamps that workpiece at room temperature will be housed are put into steam oxidation processing stove;
3) the furnace temperature instrument is arranged on 420 ℃, opening power heats up, and opens the nitrogen valve gate open and go into nitrogen when heating up, and the feeding speed of nitrogen is 20m3/h;
4) furnace temperature reached behind 420 ℃ of the setting temperatures insulation 1.5 hours, fed nitrogen in insulation, and feeding nitrogen speed is 20m3/h;
5) the furnace temperature instrument is arranged between 690 ℃, when keeping nitrogen to feed, continues to heat up, when temperature reaches 690 ℃ of setting temperatures, close nitrogen, feed water vapour, the feeding speed of water vapour be 5 ± 1m3/h (error in dipping of water vapour for ± 1m3/h);
6) furnace temperature is remained on 690 ℃ of the temperature 2.5 hours of setting, in insulation, feeds water vapour all the time, water vapour feed speed 5 ± 1m3/h (error in dipping of water vapour is ± 1m3/h), and guarantee that all the time stove inner vapor pressure is 21.46KPa;
7) furnace temperature is remained on 690 ℃ of setting temperatures after 2.5 hours, powered-down, temperature is reduced to 610 ℃ in stove, closes water vapour, opens bell, hangs out workpiece.
In above-mentioned Cast Iron Surface method for oxidation, the main chemical reaction that takes place is: 3Fe+2O
2=Fe
3O
4By this Cast Iron Surface method for oxidation, form fine and close tri-iron tetroxide patina at cast iron gas exhaust manifold outer wall, this tri-iron tetroxide oxide thickness can reach 0.015--0.025mm, the metallography microscope photo that amplification as shown in Figure 3 is 100 times, the tri-iron tetroxide oxide thickness is 0.0257417mm, has reached sealing, wear-resisting and rustless property requirement.
Claims (1)
1. the process for surface oxidation of a cast iron gas exhaust manifold is characterized in that by following method preparation:
1) the cast iron gas exhaust manifold is cleaned up;
2) the cast iron gas exhaust manifold is contained in the anchor clamps, the anchor clamps that workpiece at room temperature will be housed are put into steam oxidation processing stove;
3) the furnace temperature instrument is arranged between 300～420 ℃, opening power begins to heat up, and opens the nitrogen valve gate open and go into nitrogen when heating up, and the feeding speed of nitrogen is 16--20m
3/ h;
4) furnace temperature is incubated 1.5 hours after reaching setting temperature, feeds nitrogen in insulation, and feeding nitrogen speed is 16--20m
3/ h;
5) the furnace temperature instrument is arranged between 630～690 ℃, continues to heat up when keeping nitrogen to feed, close nitrogen when temperature reaches setting temperature, feed water vapour, the feeding speed of water vapour is 5 ± 1m
3/ h;
6) furnace temperature is remained on the temperature 2.5 hours of setting, feed water vapour all the time in insulation, water vapour feeds speed 5 ± 1m
3/ h, and guarantee that all the time stove inner vapor pressure is 14.57～21.46KPa;
7) furnace temperature is remained on setting temperature after 2.5 hours, powered-down, temperature is reduced to 530～610 ℃ in stove, closes water vapour, opens bell, hangs out workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100485559A CN100400814C (en) | 2006-08-05 | 2006-08-05 | Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100485559A CN100400814C (en) | 2006-08-05 | 2006-08-05 | Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1904322A CN1904322A (en) | 2007-01-31 |
| CN100400814C true CN100400814C (en) | 2008-07-09 |
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ID=37673661
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100485559A Active CN100400814C (en) | 2006-08-05 | 2006-08-05 | Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5420354B2 (en) * | 2009-09-08 | 2014-02-19 | 日本パーカライジング株式会社 | Chromium-free black surface-treated iron-based metal material and method for producing the same |
| JP6310495B2 (en) * | 2015-04-23 | 2018-04-11 | 日立金属株式会社 | Tool manufacturing method |
| CN110257594B (en) * | 2019-07-29 | 2023-05-16 | 湖南力方轧辊有限公司 | Prefabricated surface oxide film hot roll process and equipment |
| CN113604772A (en) * | 2021-08-18 | 2021-11-05 | 盛瑞传动股份有限公司 | Workpiece steam treatment process |
| CN113652628A (en) * | 2021-08-23 | 2021-11-16 | 卢军波 | Metal surface antirust quenching treatment process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88101245A (en) * | 1987-03-07 | 1988-11-23 | 东芝株式会社 | The method that is used for generating the stove of black oxide film on the surface of metal sheet and generates black oxide film with this stove on the material for shadow mask surface |
| JPH04193965A (en) * | 1990-11-27 | 1992-07-14 | Hitachi Metals Ltd | Method for composite surface treatment of cast iron material |
| JP2004084021A (en) * | 2002-08-28 | 2004-03-18 | Kubota Corp | Method for forming corrosion preventive layer |
| JP2004218046A (en) * | 2003-01-17 | 2004-08-05 | Oigen Chuzo Kk | Surface-treating method for cast iron article, and cast iron article |
| CN1572894A (en) * | 2003-06-04 | 2005-02-02 | 现代自动车株式会社 | Cast iron composition for automobile engine exhaust system |
| CN200952415Y (en) * | 2006-08-05 | 2007-09-26 | 河南省西峡汽车水泵股份有限公司 | Cast-iron exhaust manifold with oxide layer on surface |
-
2006
- 2006-08-05 CN CNB2006100485559A patent/CN100400814C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88101245A (en) * | 1987-03-07 | 1988-11-23 | 东芝株式会社 | The method that is used for generating the stove of black oxide film on the surface of metal sheet and generates black oxide film with this stove on the material for shadow mask surface |
| JPH04193965A (en) * | 1990-11-27 | 1992-07-14 | Hitachi Metals Ltd | Method for composite surface treatment of cast iron material |
| JP2004084021A (en) * | 2002-08-28 | 2004-03-18 | Kubota Corp | Method for forming corrosion preventive layer |
| JP2004218046A (en) * | 2003-01-17 | 2004-08-05 | Oigen Chuzo Kk | Surface-treating method for cast iron article, and cast iron article |
| CN1572894A (en) * | 2003-06-04 | 2005-02-02 | 现代自动车株式会社 | Cast iron composition for automobile engine exhaust system |
| CN200952415Y (en) * | 2006-08-05 | 2007-09-26 | 河南省西峡汽车水泵股份有限公司 | Cast-iron exhaust manifold with oxide layer on surface |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1904322A (en) | 2007-01-31 |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Henan Feilong (Wuhu) Automotive Component Co., Ltd. Assignor: Xixia Automobile Water Pump Co., Ltd., Henan Prov. Contract fulfillment period: 2008.9.28 to 2013.9.27 contract change Contract record no.: 2009340000308 Denomination of invention: Cast iron exhaust branch pipe having oxidized layer on surface and its surface oxidation method Granted publication date: 20080709 License type: Exclusive license Record date: 2009.9.10 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.9.28 TO 2013.9.27; CHANGE OF CONTRACT Name of requester: HENAN FEILONG( WUHU ) CAR PARTS CO., LTD. Effective date: 20090910 |
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| ASS | Succession or assignment of patent right |
Owner name: NANYANG FEILONG AUTOMOTIVE PARTS CO., LTD. |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 474550 INDUSTRIAL PARK, EAST RING ROAD, XIXIA COUNTY, HENAN PROVINCE TO: 474500 INDUSTRIAL PARK, EAST RING ROAD, XIXIA COUNTY, NANYANG CITY, HENAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20101022 Address after: 474500 Industrial Zone, East Ring Road, Xixia County, Henan, Nanyang Co-patentee after: Nanyang Feilong Automobile Parts Co., Ltd. Patentee after: Xixia Automobile Water Pump Co., Ltd., Henan Prov. Address before: 474550 Industrial Zone, East Ring Road, Xixia County, Henan Patentee before: Xixia Automobile Water Pump Co., Ltd., Henan Prov. |