CN1023494C - Modular cast iron cam shaft and its making method - Google Patents
Modular cast iron cam shaft and its making method Download PDFInfo
- Publication number
- CN1023494C CN1023494C CN 91105144 CN91105144A CN1023494C CN 1023494 C CN1023494 C CN 1023494C CN 91105144 CN91105144 CN 91105144 CN 91105144 A CN91105144 A CN 91105144A CN 1023494 C CN1023494 C CN 1023494C
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- China
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- remelting
- cast iron
- cam
- cam shaft
- camshaft
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- Expired - Fee Related
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Abstract
The present invention is made by block casting nodular cast iron with specific ingredients. The surface of a cam is remelted and hardened by an inert gas electric arc and a remelting copying machine tool. The problem of gear quenching is solved, and requirements of an integral shaft for bending fatigue resistance are satisfied. The wear resistance, the stickiness resistance and the strip resistance of a cam shaft are enhanced.
Description
The present invention relates to a kind of engine cam and manufacture method thereof.
At present, the material of camshaft generally forms or adopts non-alloy gray cast-iron or spheroidal graphite cast iron casting system to form with the forging of high-quality punching block both at home and abroad.The structure of camshaft mostly is overhead camshaft, does not comprise overall gear, and gear installs from camshaft one end.In order to guarantee wear resistance, when making camshaft, the forged steel camshaft adopts quench hardening, change non-alloy gray cast-iron camshaft adopt more the cold shock casting and in recent years since the surface remelting method for curing of West Germany's employing.But aforesaid method is unsuitable for block cast camshaft (being that gear and camshaft block cast are one), because the forged steel camshaft is not wear-resisting, the life-span is low.Cold shock casting camshaft expense costliness because the high chill of cost can only lean on manual could putting in the casting mold reliably to go so far, makes the still manque hope of trial of this castingprocesses automatization.And the gray iron remelting technology of West Germany can't resolve block cast cam shaft gear technological problems (the easy hardening crack of gray iron gear) and the counter-bending fatigue strength of integral shaft.Ductile iron material composition and manufacturing process that the present invention selects for use are not seen precedent both at home and abroad.
The purpose of this invention is to provide a kind of high life, the spheroidal graphite cast iron block cast camshaft that wear resisting property is good.
Another object of the present invention provides a kind of simple to operate, and cost is low, is convenient to realize the manufacture method of the ductile iron camshaft that mechanize is produced, and can make camshaft obtain better comprehensive performance.
The present invention is achieved in that adopting chemical ingredients is that C3.6～3.9%, Si1.8～2.7%, Mn0.3～1.0%, P＜0.05%, S＜0.03%, Cr≤0.5%, Mg0.03～0.06% and surplus Fe, as cast condition matrix are pearlite matrix+10～15% ferrites, and the spheroidal graphite cast iron monoblock casting of casting cementite＜3% becomes to comprise the camshaft of gear.Its manufacture method comprises: moulding, smelting, cast, machining, steps such as remelting hardening are used the remelting profiling machine that cam face is carried out remelting hardening and are handled.The remelting parameter is 5～20 volts of voltages, 30～100 amperes in electric current, 3～6 cubic metres/minute of indifferent gas flows, 2.5 minutes/week of cam travelling speed, high temperature source horizontal scanning rate 10 mm/second.
The invention will be further described below in conjunction with one embodiment of the present of invention and accompanying drawing: Fig. 1 is a structural representation of the present invention, Fig. 2 is example for the present invention's operational diagram on the remelting profiling machine with Beijing BJ492Q85 horsepower engine camshaft, selecting chemical ingredients for use is C3.6%, Si2.5%, Mn0.4%, P0.03%, S0.02%, Cr0.5%, Mg0.041%, Fe surplus as cast condition matrix is pearlite matrix+10% ferrite, the casting cementite is 3%, make nodulizing agent with Mg, employing is pressed into and adds the magnesium nodulizing process, 1～2 grade of nodulizing grade, and the spheroidal graphite cast iron monoblock casting that the spheroidal graphite size is 6～7 grades becomes to comprise overall gear 2, cam 1, the block cast camshaft of the shaft shoulder 3.Its manufacture method is after the block cast camshaft is carried out turning processing (made allowance 0.5mm), on the remelting profiling machine remelting hardening to be carried out on cam 1 surface and handle.Utilize 7000 ° of K high-temperature electric arc thermals source not melt tungsten electrode 4,, obtain the hardened wear-resistant layer of surface 1～1.5mm, hardness HRC53～62 cam 1 surface remelting through rare gas element (argon gas) protection cam face liquid bath.The remelting parameter is: 10～15 volts of voltages, 50～100 amperes in electric current, 3～6 cubic metres/minute of indifferent gas flows, 2.5 minutes/all high temperature source horizontal scanning rate 10 mm/second of cam operation circumferential speed.Owing to adopt the ductile iron camshaft of special component and the variation of remelting parameter, thereby save slow cooling operation after preheating before the remelting, the remelting, be better than West Germany's gray iron remelting processing.Magnesium iron block cast cam shaft gear 2 adopts high intermediate frequency flank of tooth quenching HRC51～57 or normalizing treatment HB260～280, solved the gray iron gear quenching easily split problem and satisfy axis body counter-bending fatigue strength require σ-1 〉=20kg/mm
2
The present invention has the following advantages:
1. through bench test and actual road test, improve 2～3 times than chilled Alloy Cast lron Camshaft anti-wear performance, satisfy the requirement of high speed high load capacity operating mode.
2. have good anti-scuffing function concurrently, block resistance, anti-bite is hindered, the toughness and tenacity of anti-strip.
3. adopt monoblock casting to solve the requirement of the counter-bending fatigue strength of overall gear quenching and axis body.
Operating procedure simple, save man-hour, cost is low.
Claims (2)
1, a kind of modular cast iron cam shaft, it is characterized in that chemical ingredients is: C 3.6～3.9%, and Si 1.8～2.7%, and Mn 0.3～1.0%, P＜0.05%, S＜0.03%, Cr≤0.5%, the spheroidal graphite cast iron of Mg 0.03～0.06% and surplus Fe.
2, a kind of method of making modular cast iron cam shaft, comprise moulding, smelting, cast, machining, remelting hardening step, it is characterized in that using in described remelting hardening step the remelting profiling machine that remelting hardening is carried out on cam (1) surface handles, the remelting parameter is: 5～20 volts of voltages, 30～100 amperes in electric current, 3～6 cubic metres/minute of indifferent gas flows, 2.5 minutes/week of cam travelling speed, high temperature source horizontal scanning rate 10 mm/second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105144 CN1023494C (en) | 1991-07-31 | 1991-07-31 | Modular cast iron cam shaft and its making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91105144 CN1023494C (en) | 1991-07-31 | 1991-07-31 | Modular cast iron cam shaft and its making method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058237A CN1058237A (en) | 1992-01-29 |
| CN1023494C true CN1023494C (en) | 1994-01-12 |
Family
ID=4907007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91105144 Expired - Fee Related CN1023494C (en) | 1991-07-31 | 1991-07-31 | Modular cast iron cam shaft and its making method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1023494C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103088248A (en) * | 2011-11-01 | 2013-05-08 | 张玉新 | Formula of nodular cast iron used in automotive gear ring bracket |
| CN104235166A (en) * | 2014-08-27 | 2014-12-24 | 湖北省丹江口丹传汽车传动轴有限公司 | Automobile power output shaft assembly and machining method thereof |
| CN104959793A (en) * | 2015-06-29 | 2015-10-07 | 安庆市吉安汽车零件锻轧有限公司 | Camshaft argon arc remelting production and machining process |
| CN109266953B (en) * | 2018-10-30 | 2020-11-27 | 湖南华民控股集团股份有限公司 | Low-manganese wear-resistant cast iron grinding ball or grinding segment and preparation method thereof |
-
1991
- 1991-07-31 CN CN 91105144 patent/CN1023494C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1058237A (en) | 1992-01-29 |
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Legal Events
| Date | Code | Title | Description |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 100022, No. 3, unit 7, 52 floor, Nong Guang, Chaoyang District, Beijing Applicant after: Du Qing Address before: Beijing City, Haidian District Zhuang Xiang Zhuang Village Applicant before: Zhang Jihu Applicant before: Jiang Lianrong |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: ZHANG JIHU; JIANG LIANRONG TO: ZHU QING |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |