CN1042187A - The surface of ductile iron workpieces remelting hardening technique - Google Patents
The surface of ductile iron workpieces remelting hardening technique Download PDFInfo
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- CN1042187A CN1042187A CN 89106953 CN89106953A CN1042187A CN 1042187 A CN1042187 A CN 1042187A CN 89106953 CN89106953 CN 89106953 CN 89106953 A CN89106953 A CN 89106953A CN 1042187 A CN1042187 A CN 1042187A
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Abstract
A kind of method of surface of ductile iron workpieces hardening treatment adopts the common inert shielded welding with the workpiece surface remelting, and wear resistance, anti scuffing ability, block resistance, the anti-bite that has improved workpiece hindered, antistripping.The workpiece that the present invention handles has passed through bench testing and actual road test, and ink-resistant property is better than steel casting.
Description
The invention belongs to the thermal treatment field, relate to a kind of spheroidal graphite cast iron surface hardening process.
Spheroidal graphite cast iron surface hardening at present adopts surperficial chill hardening to handle mostly.Though this method can obtain higher hardness, because metallographic structure is the eutectic ledeburite, its over-all properties is relatively poor.United States Patent (USP) № 3,405,247(1968 October 8) provide hard facing that a kind of blanketing with inert gas is welded in metal works to improve the method for wear resistance; but this method needs hard particles and these particle transport essential transfer lime and nozzle in the welding pool of protection of inert gas; equipment more complicated comparatively speaking; cost is higher, and it is also cumbersome to operate.
The objective of the invention is for the surface of ductile iron workpieces sclerosis provides one to need not specific equipment and mechanically resistant material, the method that cost is low, simple to operate, and make workpiece surface obtain better comprehensive performance.
The present invention is achieved by the following technical solutions: pending workpiece is dipped in the cold water, makes and treat that surfaces hardened partly surfaces, the blanketing with inert gas weldering makes the workpiece surface remelting.
The invention will be further described below in conjunction with one embodiment of the present of invention.After high temperature annealing, Shot Blasting, immerse the oil engine porthole rocking arm blank of pending spheroidal graphite cast iron in the room temperature cold water, surfaced in its post surface, garden, use argon welder, 20 volts of volts DSs, 80 amperes of galvanic currents, argon flow amount 3-6 cubic meter/hour, carry out remelting under the condition of workpiece speed of feed 2-10mm/ second.Workpiece after handling like this, case depth is 0.7～1.5mm, and the manual operations of remelting surface irregularity is 0.2～0.3mm, and power operation is below the 0.2mm.Macrohardness is HRC
60About, microhardness is HV
0.1About 700.Metallographic structure is a matrix with superfine close strip imbibition thing, and vertical cooling surface inlays on the superfine perlite of thin five distribution of dendritic (Fig. 2).This good tissue with obdurability structure can obtain the wear resisting property doubly than the high 2-3 of chilled cast iron, and has the obdurability of good anti scuffing ability, block resistance, anti-bite wound, antistripping concurrently.Compare with the quenched martensite of steel workpiece, have good thermostability, 850 ℃ of insulation difficult decomposition of a few hours down.Organize that hardness is close at normal temperatures for these two kinds, but that remelting is organized under the worst hot case changes in hardness is little.For example under 450 ℃ * 5h tempered condition, the remelting tissue keeps hardness H
0.1600, and quenched martensite hardness is reduced to HV
0.1About 360, so remelting tissue hyperthermia wear resistance is good, can bear harsh operating mode.The present invention only needs common argon welder, and equipment is simplified greatly.
Internal combustion (IC) engine camshaft adopts the foregoing description method to handle, and also obtains effect same.
With regard to many workpiece, the porthole rocking arm of for example mentioning among the embodiment, originally cast with steel casting, quench post surface, garden, back after ground finish as pore or crackle occur and promptly do and scrap processing, use the present invention and change ironcasting into, the surface as cylinder iron welding wire Welding Repair of the following pore of 1mm appears, after the sclerosis crackle can not appear, with iron for the steel better effects if.In addition, former technology cast steel, axis hole hardness is higher, and the weighshaft wearing and tearing are very fast, must the edge copper sheathing.The present invention can use cast iron instead after using, and can form a pair of pair of friction components that adapt with weighshaft, so can save copper sheathing, as can be seen, the economical effectiveness that the present invention causes after adopting also is considerable.
The present invention identifies by 300 hours through the bench testing of internal-combustion engine plant, Beijing 475Q petrol motor overhead cam rocking arm.Finished the bench testing in 600 hours of 492Q rocking arm and passed through 20,000 kilometers actual road tests, wear resisting property is better than cast steel quenching rocking arm.
Fig. 1-chilled cast iron eutectic ledeburite organization
Fig. 2-remelting strip carbide tissue
Claims (3)
1, a kind of surface of ductile iron workpieces hardening process is characterized in that pending workpiece is immersed in the cold water, makes and treats that surfaces hardened partly surfaces, and the blanketing with inert gas weldering makes the workpiece surface remelting.
2,, it is characterized in that pending workpiece is earlier through high temperature annealing, Shot Blasting according to the method for claim 1.
3, according to the method for claim 1, claim 2, it is characterized in that using argon welder, at 20 volts of volts DSs, 80 amperes of galvanic currents, argon flow amount 3-6 cubic meter/hour, carry out remelting under the condition of workpiece speed of feed 2-10mm/ second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106953 CN1013121B (en) | 1989-09-14 | 1989-09-14 | Remelting hardening technique for the surface of ductile iron workpieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106953 CN1013121B (en) | 1989-09-14 | 1989-09-14 | Remelting hardening technique for the surface of ductile iron workpieces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1042187A true CN1042187A (en) | 1990-05-16 |
| CN1013121B CN1013121B (en) | 1991-07-10 |
Family
ID=4856998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89106953 Expired CN1013121B (en) | 1989-09-14 | 1989-09-14 | Remelting hardening technique for the surface of ductile iron workpieces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013121B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239102A (en) * | 2020-01-21 | 2020-06-05 | 沈阳德其乐科技有限公司 | Remelting and whitening spectral detection method for surface of grey iron |
-
1989
- 1989-09-14 CN CN 89106953 patent/CN1013121B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239102A (en) * | 2020-01-21 | 2020-06-05 | 沈阳德其乐科技有限公司 | Remelting and whitening spectral detection method for surface of grey iron |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1013121B (en) | 1991-07-10 |
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| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
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| CB02 | Change of applicant information |
Address after: 100021, No. three, unit seven, building 52, Nong Guang, Chaoyang District, Beijing Applicant after: Du Rongfa Applicant before: Beijing Shanghzuang Spiracle Factory |
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| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: BEIJING SHANGZHUANG SPIRACLE FACTORY TO: ZHU RONGFA |
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| 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 |