CN1757764A - Treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece - Google Patents
Treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece Download PDFInfo
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- CN1757764A CN1757764A CN 200510015621 CN200510015621A CN1757764A CN 1757764 A CN1757764 A CN 1757764A CN 200510015621 CN200510015621 CN 200510015621 CN 200510015621 A CN200510015621 A CN 200510015621A CN 1757764 A CN1757764 A CN 1757764A
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Abstract
A technology for hardening the CrMoCu alloyed cast iron workpiece and generating a soft-hard interface by laser solid-state phase change includes such steps as cleaning the surface of workpiece to be hardened, coating optical absorbing paint, fast scanning on said surface by high-power-density laser beams to heat it to a temp between smelting point and phase changing point for hardening it and natural cooling.
Description
Technical field
The invention belongs to material surface thermal treatment field, in particular, relate to a kind ofly use the high-energy-density laser beam surface treatment makes it produce the method for solid transformation hardening to the chromium molybdenum copper cast iron part.
Background technology
Chromium molybdenum copper cast iron intensity height, thermal fatigue property are good, have been widely used in making the workpiece such as cylinder body, cylinder head, steam jacket and machine element of each h type engine h.Though chromium molybdenum copper cast iron has wear resisting property preferably than common grey iron, when joining pair, just, do not reach design requirements work-ing life because of being difficult to bear the very fast inefficacy of intensive frictional wear with the higher material of hardness.In order to improve the work-ing life of workpiece, the surface hardness of workpiece generally need reach HV550, and case depth should be more than the 0.4mm, conventional inaccessible this requirement of heat treating method.
Summary of the invention
The objective of the invention is can increase substantially chromium molybdenum copper cast iron part surface hardness effectively in order to provide a kind of, and form a kind of soft, hard alternate district, when joining pair with high hard material, wear resistance is good, the laser solid transformation hardening treatment process of long service life.
The present invention is achieved through the following technical solutions:
A kind of treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece comprises the steps:
(1) the pending surface of chromium molybdenum copper cast iron part is cleaned out, removed greasy dirt;
(2) extinction coating is spread upon uniformly on the pending surface of chromium molybdenum copper cast iron part;
(3) the above-mentioned workpiece that has light absorbing material is placed on the worktable, the defocusing amount of laser beam is L;
(4) Workpiece Rotating or laser beam move, and select 1.0 * 10 for use
3～1.2 * 10
4W/cm
2Power density rapid scanning finished surface, it is heated to more than the following phase point temperature of fusing point, by the cold conditions workpiece hot spot is cooled off fast, produce transformation hardening;
(5) naturally cool to room temperature after, carry out surface-conditioning, inspection.
Above-mentioned laser beam defocusing amount is 10～25mm.
The output rating of above-mentioned laser beam is 700～1500W.
The spot diameter of above-mentioned laser beam is 2～4mm.
Above-mentioned laser scanning speed is 0.5～3m/min.
The workpiece surface layer tissue that adopts method of the present invention to handle is fine and closely woven, surface hardness is high and be evenly distributed, and wear resistance is good.Any surface finish flawless, the long service life of workpiece.And be out of shape little.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
Treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece of the present invention comprises the steps:
At first, the pending surface of chromium molybdenum copper cast iron part is cleaned out, removed greasy dirt.Can use conventional surface-conditioning method, as using acetone scouring etc.
Again extinction coating is spread upon on the pending surface of chromium molybdenum copper cast iron part uniformly.Can use conventional extinction coating, as TH-2 type extinction coating.
The above-mentioned workpiece that has light absorbing material is placed on the worktable, and making the laser beam defocusing amount is L, and L is generally 10～25mm.
Require to select 1.0 * 10 according to hardened-depth and process redundancy
3～1.2 * 10
4W/cm
2Power density, promptly determine output rating P (W), laser scanning speed V (m/min), the spot diameter d (mm) of laser beam.The output rating of laser beam can be 700～1500W, and laser scanning speed is 0.5～3m/min, and spot diameter can be 2～4mm.Power density=4P/ π dV.
Under the condition of the laser power of determining, sweep velocity, Workpiece Rotating or laser beam move the rapid scanning finished surface, and it is heated to more than the following phase point temperature of fusing point, produce transformation hardening.After waiting to naturally cool to room temperature, carry out surface-conditioning, inspection at last.
Embodiment:
φ 125 steam jacket laser solid transformation hardenings are handled, and it carries out as follows:
At first, with the pending surface of this steam jacket acetone scrub, thoroughly remove greasy dirt.Use TH-2 type extinction coating to spread upon uniformly on the pending surface of steam jacket.Steam jacket is placed on the rotary table, and selecting focal length for use is the condenser lens of 350mm, and defocusing amount L is 20mm.Spot diameter is 2.5mm.The steam jacket rotation, speed of rotation is 2r/min, laser head comes and goes vertically thereupon and moves, and with the velocity sweeping finished surface of P=1150W, V=1.6m/min, makes its rapid heating and quick cooling produce solid transformation hardening.After treating that workpiece naturally cools to room temperature, carry out surface-conditioning, inspection.Steam jacket hardness through above-mentioned processing can reach more than the HV550 hardened-depth 0.4mm～0.7mm.
Although relate to a kind of treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece and carried out special description disclosed with reference to embodiment, embodiment described above is illustrative and not restrictive, under the situation that does not break away from the spirit and scope of the present invention, all variations and modification are all within the scope of the present invention.
Claims (5)
1. a treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece is characterized in that, comprises the steps:
(1) the pending surface of chromium molybdenum copper cast iron part is cleaned out, removed greasy dirt;
(2) extinction coating is spread upon uniformly on the pending surface of chromium molybdenum copper cast iron part;
(3) the above-mentioned workpiece that has light absorbing material is placed on the worktable, the defocusing amount of laser beam is L;
(4) Workpiece Rotating or laser beam move, and select 1.0 * 10 for use
3～1.2 * 10
4W/cm
2Power density rapid scanning finished surface, it is heated to more than the following phase point temperature of fusing point, produce transformation hardening;
(5) naturally cool to room temperature after, carry out surface-conditioning, inspection.
2, the treatment process of chromium molybdenum copper cast iron part laser solid transformation hardening according to claim 1 is characterized in that above-mentioned laser beam defocusing amount is 10～25mm.
3, the treatment process of chromium molybdenum copper cast iron part laser solid transformation hardening according to claim 1, the output rating that it is characterized in that above-mentioned laser beam is 700～1500W.
4, the treatment process of chromium molybdenum copper cast iron part laser solid transformation hardening according to claim 1, the spot diameter that it is characterized in that above-mentioned laser beam is 2～4mm.
5, the treatment process of chromium molybdenum copper cast iron part laser solid transformation hardening according to claim 1 is characterized in that above-mentioned laser scanning speed is 0.5～3m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510015621 CN1757764A (en) | 2005-10-25 | 2005-10-25 | Treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510015621 CN1757764A (en) | 2005-10-25 | 2005-10-25 | Treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece |
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| CN1757764A true CN1757764A (en) | 2006-04-12 |
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| CN 200510015621 Pending CN1757764A (en) | 2005-10-25 | 2005-10-25 | Treatment method of laser solid state phase change hardening treatment of chromium molybdenum coper cast iron work piece |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177274A (en) * | 2015-10-19 | 2015-12-23 | 无锡清杨机械制造有限公司 | Laser hardening process |
| CN107937700A (en) * | 2017-12-25 | 2018-04-20 | 杭州电子科技大学 | A kind of high-rate laser defocus quenching strengthening method for miniature shaving tool |
| CN108384925A (en) * | 2018-03-13 | 2018-08-10 | 上海工程技术大学 | A kind of Cast Iron Surface laser remolten strengthening layer and preparation method thereof |
| TWI665334B (en) * | 2014-07-21 | 2019-07-11 | H. E. F. | Treatment process of a nitrocarburised/nitrided part |
| CN110885920A (en) * | 2019-10-29 | 2020-03-17 | 天津修船技术研究所(中国船舶重工集团公司第六三一三研究所) | Method for strengthening exhaust valve seat of cylinder cover of special cast iron diesel engine |
-
2005
- 2005-10-25 CN CN 200510015621 patent/CN1757764A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI665334B (en) * | 2014-07-21 | 2019-07-11 | H. E. F. | Treatment process of a nitrocarburised/nitrided part |
| CN105177274A (en) * | 2015-10-19 | 2015-12-23 | 无锡清杨机械制造有限公司 | Laser hardening process |
| CN107937700A (en) * | 2017-12-25 | 2018-04-20 | 杭州电子科技大学 | A kind of high-rate laser defocus quenching strengthening method for miniature shaving tool |
| CN107937700B (en) * | 2017-12-25 | 2019-05-31 | 杭州电子科技大学 | A kind of high-rate laser defocus quenching strengthening method for miniature shaving tool |
| CN108384925A (en) * | 2018-03-13 | 2018-08-10 | 上海工程技术大学 | A kind of Cast Iron Surface laser remolten strengthening layer and preparation method thereof |
| CN110885920A (en) * | 2019-10-29 | 2020-03-17 | 天津修船技术研究所(中国船舶重工集团公司第六三一三研究所) | Method for strengthening exhaust valve seat of cylinder cover of special cast iron diesel engine |
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