CN102463414A - Method for welding piston by laser with laser heat treatment - Google Patents
Method for welding piston by laser with laser heat treatment Download PDFInfo
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- CN102463414A CN102463414A CN2010105419367A CN201010541936A CN102463414A CN 102463414 A CN102463414 A CN 102463414A CN 2010105419367 A CN2010105419367 A CN 2010105419367A CN 201010541936 A CN201010541936 A CN 201010541936A CN 102463414 A CN102463414 A CN 102463414A
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Abstract
The invention relates to the technical field of laser heat treatment, in particular to a method for welding a piston by laser with laser heat treatment. A piston ring sleeve and a piston head in interference fit are preheated by laser; then, an annular welding line is welded and connected by the laser; and after welding is finished, the piston ring sleeve and the piston head are subjected to post-heat treatment. The method disclosed by the invention comprises the following steps of: firstly, cleaning the piston ring sleeve and the piston head in interference fit by acetone; then, fixing the piston ring sleeve and the piston head on the fixture of a positioner; preheating above a piston by a laser head arranged on a numerical control machine tool system; meanwhile, rotating the positioner, and welding by laser after the surface temperature of the piston reaches certain value; and carrying out postheat treatment by laser after welding is finished. According to the method, the problem that the welding line is cracked when the piston is welded by the laser is solved, the heat treatment technology is simplified, welding line forming stability is improved, and welding quality is easier to control.
Description
Technical field:
The present invention relates to the laser heat treatment technology field, be specially a kind of method with Laser Heat Treating in China laser welding of piston.
Background technology:
The production of piston mainly contains global formation mode and welding fabrication mode, through the main welding manner of the piston of welding fabrication laser weld, electron beam welding and friction Stir is arranged.In the Chinese patent (publication number CN1610601A); A kind of piston production method of global formation is disclosed; Utilize the method for forging to produce the piston embryo, and then utilize mach method to produce complete piston, this is the method that a kind of global formation is made piston.In making through the piston of welding fabrication; One Chinese patent application (publication number CN101468426A) discloses a kind of method of independent laser welding of piston; In the one Chinese patent application (publication number CN1944994A), a kind of method of utilizing friction stir welding to come welding piston is disclosed.In U.S. Pat 4553015, a kind of method of utilizing welding piston by electron beam head and skirt section is disclosed.At present, global formation is made in the method for piston, and its manufacturing process is complicated, and cost is higher.Utilize welding to make in the method for piston; Laser weld efficient is very high, and still weld seam easy of crack in welding process also is prone to delayed crack after the welding completion; Utilize heat-treating methods to address this problem; But common heat treatment method has increased the manufacturing cost and the operation of piston, and it is very complicated that technical process becomes; Utilize the method for friction stir welding to make piston, occur stress rupture and blemish easily; Utilize the method for electron beam welding to make piston, need vacuumize, cost is higher, and efficient is low, and can produce X ray, and its value in factory application is very low.
Summary of the invention:
For the deficiency that solves other welding piston methods with overcome the problem that delayed crack appears in laser welding of piston weld seam easy of crack and postwelding easily, the present invention provides a kind of method with Laser Heat Treating in China laser welding of piston.
Technical scheme of the present invention is:
1, a kind of method with Laser Heat Treating in China laser welding of piston utilizes laser to carry out preheating before laser welding of piston, directly utilizes preheating power to carry out laser weld after the preheating, and welding utilizes same power to carry out after-baking after accomplishing again.
2, this method is applied in the laser weld heat treatment of circular weld of 42CrMo piston ring set and piston head.
3, the light source of laser is to be sent by high-power optical fiber laser, and its peak power output is 6000W.
4, piston is fixed by the anchor clamps clamping on the positioner; Make the dead in line of the axis and the positioner of piston; Positioner be in laser head under, the switch light of the rotation of the digital control system control positioner through Digit Control Machine Tool, rise, descending motion and the laser instrument of laser head.
5, when laser preheating or post-laser heat treatment, laser head rises or drops to apart from piston face 150-200mm.
6, when laser preheating or after-baking, it is static relatively that piston and positioner keep, and piston is driven by positioner and rotates; Positioner can be realized clockwise and be rotated counterclockwise, and its control is integrated in the digital control system its speed-controllable.
7, the control of laser instrument is integrated in the digital control system, the bright dipping time with go out luminous power and can in digital control system, regulate.
8, during the laser preheating, positioner drives the speed rotation of piston with 2-6m/min, and rotation 15-20 circle, and laser head is in the big defocusing amount place's bright dipping apart from piston, and defocusing amount is in the 150-200mm scope.
9, the temperature of laser preheating is between 120 ℃-180 ℃, and the temperature of post-laser heat treatment is between 80 ℃-140 ℃, and post-laser heat treatment is carried out in after welding process finishes 5-10 minute, and the temperature of after-baking is lower than 30 ℃-40 ℃ of the temperature of preheating; The temperature of laser preheating or after-baking specifically refers to the temperature of piston face.
10, the optimized parameter of laser preheating is: laser preheating speed 5m/min, and laser preheating power 5000w, preheating laser defocusing amount 150mm, the spot diameter of laser preheating is 16mm, the temperature of preheating is more than 120 ℃;
The optimized parameter of post-laser heat treatment is: treat after the welding to begin after-baking again after workpiece naturally cools to 30 ℃-40 ℃; Post-laser heat treatment speed is 5m/min; Post-laser heat treatment power is 5000w; The defocusing amount of post-laser heat treatment is 150mm, and laser after heat spot diameter is 16mm, and the temperature of after-baking is more than 80 ℃.
The invention has the beneficial effects as follows:
1, the present invention utilizes laser that piston ring set and the piston crown that adopts interference fit carried out preheating, and then utilizes laser that this circular weld is welded to connect, and again piston ring set and piston crown is carried out after-baking after the completion to be welded.In the method for the invention; At first utilize acetone that the piston ring set and the piston crown of interference fit are cleaned; Place it in then on the anchor clamps of positioner fixing, utilize by numerically-controlled machine tool system with laser head above piston, carry out preheating, rotate positioner simultaneously; Utilize laser to weld again after the surface temperature of treating piston reaches certain value, welding utilizes laser to carry out after-baking after accomplishing again.
2, the present invention proposes a kind of method of utilizing the laser welding of piston that laser heat-treats; Heat-treat front and back through at laser welding of piston; Solved the cracking problem of laser welding of piston; And simplified the piston process of thermal treatment, improved the quality of weld seam molding of laser welding of piston.
3, the action of laser head rise of the present invention or decline is carried out on Digit Control Machine Tool, is controlled by digital control system, and when laser preheating or after-baking, it is static relatively that piston and positioner keep, and positioner can drive piston and freely rotate.Positioner can be realized clockwise and be rotated counterclockwise, and its control is integrated in the digital control system its speed-controllable.
Description of drawings:
Fig. 1 is according to the flow chart of laser preheating welding piston of the present invention.
The postwelding design sketch of Fig. 2 specific embodiment.
The specific embodiment:
The bright dipping of the rotation of the digital control system control positioner of the present invention through Digit Control Machine Tool, rise, descending motion or the laser instrument of laser head.When laser preheating or after-baking, it is static relatively that piston and positioner keep, and piston is driven by positioner and rotates; Positioner can be realized clockwise and be rotated counterclockwise, and its control is integrated in the digital control system its speed-controllable.The control of laser instrument is integrated in the digital control system, the bright dipping time with go out luminous power and can in digital control system, regulate.
According to the present invention, it is applied in the laser weld heat treatment of 42CrMo piston ring set and piston head.The 42CrMo piston; Its phosphorus content belongs to the scope of medium carbon steel, and the laser weld of medium and high carbon steel very easily cracks, in the technology of existing laser welding of piston; Be easy to weld cracking in the process of welding; Simultaneously in the cooling procedure of postwelding, also occur delayed crack easily,, can be good at addressing this problem through using LASER HEAT TREATMENT welding method of the present invention.
As shown in Figure 1; In the method for the invention, at first utilize acetone that the piston ring set and the piston crown of interference fit are cleaned, place it in the clamps of positioner then; Utilization by Digit Control Machine Tool with laser head irradiating laser above piston carry out preheating; Rotate positioner simultaneously, utilize laser to weld again after the surface temperature of treating piston reaches more than 120 ℃, welding utilizes laser to carry out after-baking after accomplishing again.Its concrete steps are following:
(1) surface with piston cleans up with acetone soln, removes the greasy dirt and the impurity on surface.
(2) piston is fixed on the positioner, utilizes anchor clamps to step up, make itself and positioner static relatively, and make the axle center of piston coaxial with the axle center of positioner, positioner be positioned at laser head under.
(3) laser head is lifted certain altitude, apart from piston face 150mm.Wherein the focus lamp focal length of laser head is 200mm, and the focal length of collimating mirror is 150mm, and fibre diameter is 200mm.
(4) the rotation positioner drives piston rotation, makes the linear velocity of piston reach 5m/min, after rotating 30 ° of angles, makes Laser emission, and irradiation is to piston face.
(5) make positioner rotate continuously 15 circles, make the piston face temperature reach 180 ℃, reach 120 ℃ away from the zone of laser beam irradiation at the laser beam irradiation near zone.
The optimized parameter of laser preheating is: piston rotary speed 5m/min, and laser power 5000w, laser defocusing amount 150mm, the spot diameter of laser are 16mm.
(6) stop Laser emission, stop the rotation of positioner simultaneously, laser head is dropped to welding and assembling height directly weld, laser power need not change.
When (7) temperature of wait piston face drops between 30 ℃-40 ℃, lift laser head, the height that lifts is consistent with step 3.
(8) the rotation positioner drives the piston rotation, and the speed of rotation is consistent with step 4, makes Laser emission simultaneously, and irradiation is to piston face.
(9) with positioner with the speed of step 4 rotation 5 circles, make the surface temperature of piston reach 110 ℃ in the zone nearby apart from laser beam, reach 80 ℃ away from the zone of laser beam irradiation.
The optimized parameter of post-laser heat treatment is: the piston rotary speed is 5m/min, and laser power is 5000w, and the laser defocusing amount is 150mm, and laser spot diameter is 16mm.
(10) stop Laser emission, stop positioner and rotate, simultaneously piston is encased with heat-preservation cotton, take off workpiece and treat its cooling.
As shown in Figure 2, in the present embodiment, carry out crack detection through the butt welded seam place, do not find crackle, appearance of weld is good.Compare with existing independent laser welding technology, the generation rate of its crackle reduces greatly, has optimized laser welding process.
Explanation is at last; Above embodiment only is for concrete technical scheme of the present invention is described; But not to its restriction; And on using, can extend to other modification, variation, application and embodiment, think that simultaneously all such modifications, variation, application and embodiment are within the spirit and scope of the present invention.
Claims (10)
1. method with Laser Heat Treating in China laser welding of piston; It is characterized in that; Before laser welding of piston, utilize laser to carry out preheating, directly utilize preheating power to carry out laser weld after the preheating, welding utilizes same power to carry out after-baking after accomplishing again.
2. according to the described method of claim 1, it is characterized in that this method is applied in the laser weld heat treatment of circular weld of 42CrMo piston ring set and piston head with Laser Heat Treating in China laser welding of piston.
3. according to the described method with Laser Heat Treating in China laser welding of piston of claim 1, it is characterized in that the light source of laser is to be sent by high-power optical fiber laser, its peak power output is 6000W.
4. according to the described method of claim 1 with Laser Heat Treating in China laser welding of piston; It is characterized in that; Piston is fixed by the anchor clamps clamping on the positioner; Make the dead in line of the axis and the positioner of piston, positioner be positioned at laser head under, the switch light of the rotation of the digital control system control positioner through Digit Control Machine Tool, rise, descending motion and the laser instrument of laser head.
5. according to the described method of claim 4, it is characterized in that, when laser preheating or post-laser heat treatment, laser head is risen or drops to apart from piston face 150-200mm with Laser Heat Treating in China laser welding of piston.
6. according to the described method with Laser Heat Treating in China laser welding of piston of claim 4, it is characterized in that when laser preheating or after-baking, it is static relatively that piston and positioner keep, piston is driven by positioner and rotates; Positioner can be realized clockwise and be rotated counterclockwise, and its control is integrated in the digital control system its speed-controllable.
7. according to the described method of claim 4, it is characterized in that the control of laser instrument is integrated in the digital control system with Laser Heat Treating in China laser welding of piston, the bright dipping time with go out luminous power and can in digital control system, regulate.
8. according to the described method of claim 4 with Laser Heat Treating in China laser welding of piston; It is characterized in that; During the laser preheating, positioner drives the speed rotation of piston with 2-6m/min, and makes piston rotation 15-20 circle; Laser head is in the big defocusing amount place's bright dipping apart from piston, and defocusing amount is in the 150-200mm scope.
9. according to the described method of claim 1 with Laser Heat Treating in China laser welding of piston; It is characterized in that; The temperature of laser preheating is between 120 ℃-180 ℃; The temperature of post-laser heat treatment is between 80 ℃-140 ℃, and post-laser heat treatment is carried out in after welding process finishes 5-10 minute, and the temperature of after-baking is lower than 30 ℃-40 ℃ of the temperature of preheating; The temperature of laser preheating or after-baking specifically refers to the temperature of piston face.
10. according to the described method of claim 1 with Laser Heat Treating in China laser welding of piston; It is characterized in that; The optimized parameter of laser preheating is: laser preheating speed 5m/min, laser preheating power 5000w, preheating laser defocusing amount 150mm; The spot diameter of laser preheating is 16mm, and the temperature of preheating is more than 120 ℃;
The optimized parameter of post-laser heat treatment is: treat after the welding to begin after-baking again after workpiece naturally cools to 30 ℃-40 ℃; Post-laser heat treatment speed is 5m/min; Post-laser heat treatment power is 5000w; The defocusing amount of post-laser heat treatment is 150mm, and laser after heat spot diameter is 16mm, and the temperature of after-baking is more than 80 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105419367A CN102463414A (en) | 2010-11-11 | 2010-11-11 | Method for welding piston by laser with laser heat treatment |
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| CN2010105419367A CN102463414A (en) | 2010-11-11 | 2010-11-11 | Method for welding piston by laser with laser heat treatment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008886A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Self-adaptive laser shock welding method and device |
| CN105904092A (en) * | 2016-05-03 | 2016-08-31 | 武汉钢铁股份有限公司 | Meidum- and high-carbon steel plate laser welding method and device |
| CN106944753A (en) * | 2017-05-15 | 2017-07-14 | 吉林大学 | A kind of forging steel piston Laser Welding attachment means and technique |
| CN113814562A (en) * | 2021-10-13 | 2021-12-21 | 宜宾上交大新材料研究中心 | Laser welding method |
| CN114101938A (en) * | 2021-12-06 | 2022-03-01 | 贵州大学 | Preheating method and laser welding method for bolt and fixing piece |
| CN115815812A (en) * | 2022-10-20 | 2023-03-21 | 磐吉奥科技股份有限公司 | Welding method of medium-high carbon steel |
| CN116275509A (en) * | 2023-05-15 | 2023-06-23 | 苏州亚太精睿传动科技股份有限公司 | Laser welding method |
Citations (5)
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| US20040188394A1 (en) * | 2003-02-28 | 2004-09-30 | Wolfgang Becker | Process for laser welding with pre- and/or post-heating in the area of the weld seam |
| CN1533860A (en) * | 2003-04-01 | 2004-10-06 | 孔凡鲁 | Application of laser welding in manufacturing seal piston ring |
| CA2670142A1 (en) * | 2006-11-22 | 2008-05-29 | Sms Demag Ag | Method and apparatus for the heat treatment of welds |
| CN101254562A (en) * | 2006-11-13 | 2008-09-03 | 沃尔沃汽车公司 | Method for laser brazing with twinspot |
| CN101468426A (en) * | 2007-12-27 | 2009-07-01 | 中国科学院力学研究所 | Method for laser welding of piston |
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2010
- 2010-11-11 CN CN2010105419367A patent/CN102463414A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040188394A1 (en) * | 2003-02-28 | 2004-09-30 | Wolfgang Becker | Process for laser welding with pre- and/or post-heating in the area of the weld seam |
| CN1533860A (en) * | 2003-04-01 | 2004-10-06 | 孔凡鲁 | Application of laser welding in manufacturing seal piston ring |
| CN101254562A (en) * | 2006-11-13 | 2008-09-03 | 沃尔沃汽车公司 | Method for laser brazing with twinspot |
| CA2670142A1 (en) * | 2006-11-22 | 2008-05-29 | Sms Demag Ag | Method and apparatus for the heat treatment of welds |
| CN101468426A (en) * | 2007-12-27 | 2009-07-01 | 中国科学院力学研究所 | Method for laser welding of piston |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008886A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Self-adaptive laser shock welding method and device |
| CN103008886B (en) * | 2012-12-28 | 2015-04-08 | 江苏大学 | Self-adaptive laser shock welding method and device |
| CN105904092A (en) * | 2016-05-03 | 2016-08-31 | 武汉钢铁股份有限公司 | Meidum- and high-carbon steel plate laser welding method and device |
| CN106944753A (en) * | 2017-05-15 | 2017-07-14 | 吉林大学 | A kind of forging steel piston Laser Welding attachment means and technique |
| CN113814562A (en) * | 2021-10-13 | 2021-12-21 | 宜宾上交大新材料研究中心 | Laser welding method |
| CN114101938A (en) * | 2021-12-06 | 2022-03-01 | 贵州大学 | Preheating method and laser welding method for bolt and fixing piece |
| CN115815812A (en) * | 2022-10-20 | 2023-03-21 | 磐吉奥科技股份有限公司 | Welding method of medium-high carbon steel |
| CN116275509A (en) * | 2023-05-15 | 2023-06-23 | 苏州亚太精睿传动科技股份有限公司 | Laser welding method |
| CN116275509B (en) * | 2023-05-15 | 2023-09-08 | 苏州亚太精睿传动科技股份有限公司 | Laser welding method |
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Application publication date: 20120523 |