CN103111496B - Progressive bending sheet metal - Google Patents
Progressive bending sheet metal Download PDFInfo
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- CN103111496B CN103111496B CN201210595099.5A CN201210595099A CN103111496B CN 103111496 B CN103111496 B CN 103111496B CN 201210595099 A CN201210595099 A CN 201210595099A CN 103111496 B CN103111496 B CN 103111496B
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- 239000002184 metal Substances 0.000 title claims abstract description 20
- 238000005452 bending Methods 0.000 title abstract description 6
- 230000000750 progressive effect Effects 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 10
- 238000012795 verification Methods 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229920000914 Metallic fiber Polymers 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The invention provides a progressive bending sheet metal which is manufactured with the method of laser bending forming. According to the laser bending forming method, proper and unique technological parameters are chosen, deformation of the sheet metal is controlled accurately, and the progressive bending sheet metal is obtained at last. Interval between passes of the sheet metal is preferred to be 1.5-2mm, and reciprocating scanning time of each pass is preferred to be 10 times, diameter of a laser beam spot is 0.1mm, power is 20-25W, scanning speed is 15-20mm, and curvature of the sheet metal obtained at last is about 0.05-1mm.
Description
Technical field
The present invention relates to a kind of sheet metal, a kind of laser bend forming processes the sheet metal of the continuous bend obtained specifically.
Background technology
The formed machining of sheet metal occupies quite heavy ratio in Aeronautics and Astronautics, automobile, boats and ships and civilian industry.Quantity as sheet material forming part accounts for 1/2 of airplane parts sum, and the material that the whole world produces according to statistics has and is more than halfly processed to sheet material.Therefore, corresponding forming technique is improved and manufacture level is a problem be of universal significance.
The key problem of modern sheet material forming technology embodies a concentrated reflection of simplified design, improve quality, shortening cycle, the aspect such as to reduce costs.Traditional forming technique needs, according to plate shape, to manufacture corresponding tool and mould usually, and this not only requires a great deal of time and fund, but also will take considerable human resources, certainly will increase product cost.In large-scale plate is shaped, these expenses are more expensive.For the large-sized sheet material part of small lot, particularly so.
Laser bend forming, also Laser Thermal Stress Forming is claimed, it is that the fuel factor utilizing laser irradiation to produce at material surface is shaped, namely time with high energy laser beam scanning sheet metal, define the uneven temperature field all very large to room and time gradient in the region of laser beam irradiation, thus bring out unbalanced stress on sheet metal thickness direction sheet material is deformed.The advantages such as it, from traditional to complete the method for Plastic Forming by mould different, have with short production cycle, that cost is low feature, have flexible large simultaneously due to the process principle of its uniqueness, the fragile material that is difficult to shaping at normal temperatures of being shaped.
Laser bend forming principle as shown in Figure 1, when the laser beam of high order focusing scans along plate upper surface (as Suo Shi Fig. 1 (a)), sharply risen by the material instantaneous temperature of sweep test, and plate lower surface does not significantly change instantaneously at this thus forms strong thermograde in thickness of slab direction, due to the thermal expansion of heating region material, material is made to produce recurvate plastic deformation; When after laser beam transfer (as Suo Shi Fig. 1 (b)), top surface temperature declines, due to heat trnasfer, temperature rises lower surface material, thermograde on thickness of slab direction is sharply declined, such top surface is shunk and lower surface material expansion, and the material that upper surface has been piled up is difficult to restore, when the thermograde of upper and lower surface material is zero, the metallic fiber of top surface just than lower surface material come short, create and bend towards by the forward according to laser scanning course bearing.
But in process, the thermal stress of induction need exceed the yield limit of material, sheet material could be out of shape, therefore sheet material needs ten several secondary shuttle-scanning even up to a hundred, and in heat scan process so repeatedly, the factors such as heat accumulation, material deformation, performance change make the deflection controlling material become difficulty, not easily realize, the particularly continuous bend distortion of material, need to implement the operation of multi-pass shuttle-scanning to material, situation is more complicated.
Summary of the invention
Namely object of the present invention is the sheet metal of the continuous bend providing a kind of laser bend forming to prepare.
For achieving the above object, the technical solution adopted in the present invention is: step one), according to length determination laser scanning passage number and every time the shuttle-scanning number of times of the processing of processed workpiece actual needs; Step 2), cleaning processed workpiece surface, and pretreatment is carried out to processed workpiece and fixes; Step 3), the laser instrument that computerizeds control is with step one) in the passage number determined and reciprocal time processed workpiece is scanned; Step 4), after workpiece to be treated cools naturally after completion of processing, it is taken out from fixture and implements to measure verification.
Processed part is generally austenitic stainless steel thin plate (such as 0Cr18Ni9), carbon steel thin plate etc.; Steel plate thickness is generally 0.1-0.15mm.
Step one) in, the determination of scanning passage number obtains divided by the interval between passage by the length of processed workpiece actual needs processing; The preferred 1.5-2mm in interval between passage, and every time shuttle-scanning number of times preferably 10 times, this will the processing curvature of thin plate be made basicly stable owing to so setting, and the impact between each passage is less.
Step 2) in, after adopting emery paper to polish to remove foreign matter to processed workpiece surface, and carry out on surface applying pitch-dark pretreatment to increasing the assimilation effect of laser energy; The fixing of processed workpiece is pressed in middle realization preferably by two pieces of glass plates, bends or mobile grade and affect once the accurate location of passage to avoid processed workpiece in process.
Step 3) in, laser beam spot diameter is 0.1mm, power is 20-25W, sweep speed is 15-20mm, this is due to the energy density under this bundle spot and power, obtains maximum curvature, if sweep speed is too small under this sweep speed, then hot-spot and residual stress that front a time laser irradiation is produced slows down to some extent, sweep speed is excessive, and the part making sheet material inside produce stress diminishes, in addition, passage order take by scanning sequence from two ends to center (as in Fig. 2 label order, from 1. to 6. sequential scanning), namely first one end (being called first end) the outermost passage of processed workpiece is scanned, then the other end (being called the second end) outermost passage is scanned, again time outside passage of first end next-door neighbour outermost passage is scanned, then time outside passage of the second end next-door neighbour outermost passage is scanned, order like this is until the center passage of processed workpiece, the end of scan, such arrangement scanning sequency is in order to avoid influencing each other and obtaining stable curvature between passage.
Step 4) in, after the end of scan, leave standstill processed workpiece and naturally cool under room temperature environment, remove fixture, take out processed workpiece and implement to measure verification, finally complete the processing to thin plate.
By said method step, can obtain and have compared with deep camber and the metallic plate of continuous bend.
Advantage of the present invention is: by selecting suitable in laser bending shaping method and the technological parameter of uniqueness, achieves the deflection that accurately controls sheet metal and obtains the sheet metal of continuous bend distortion.
Accompanying drawing explanation
Fig. 1 is laser bend forming principle schematic;
Fig. 2 is laser bend forming is laser scanning passage sequential schematic.
Detailed description of the invention
Below, by specific embodiment, the present invention is described in detail.
Embodiment.
Using the 0Cr18Ni9 stainless sheet steel of 0.15mm thickness as processed workpiece, the long 25mm of thin plate (actual needs processing part is about 20mm), wide 5mm.Interval between passage is set as 2mm, calculates thus and scans 10 passages altogether, every time shuttle-scanning 10 times.After adopting emery paper to polish to remove foreign matter to processed workpiece surface, carry out on surface applying pitch-dark pretreatment, then thin plate is pressed between two pieces of glass plates.Setting laser beam spot diameter, is 0.1mm, and power is 22W, and sweep speed is 18mm, carries out according to by the scanning sequence of thin plate two ends to center.After the end of scan, leave standstill processed workpiece and naturally cool under room temperature environment, remove fixture, take out processed workpiece and implement to measure verification, the curvature recording thin plate is about 0.05mm
-1, finally complete the processing to thin plate.
Claims (3)
1. a sheet metal for continuous bend, it is prepared by following laser bend forming procedure of processing: step one), according to length determination laser scanning passage number and every time the shuttle-scanning number of times of the processing of processed workpiece actual needs; Step 2), cleaning processed workpiece surface, and pretreatment is carried out to processed workpiece and fixes; Step 3), the laser instrument that computerizeds control is with step one) in the passage number determined and reciprocal time processed workpiece is scanned; Step 4), after workpiece to be treated cools naturally after completion of processing, it is taken out from fixture and implements to measure verification, obtain the sheet metal of continuous bend;
Wherein, step one) in the determination of scanning passage number be obtain divided by the interval between passage by the length that processed workpiece actual needs is processed; Be spaced apart 1.5-2mm between passage, and every time shuttle-scanning number of times is 10 times;
Wherein, step 3) in laser beam spot diameter be 0.1mm, power is 20-25W, and sweep speed is 15-20mm;
Wherein, step 3) in passage order take by the scanning sequence of two ends to center, namely first one end of processed workpiece outermost passage referred to herein as first end is scanned, then the outermost passage of the other end referred to herein as the second end is scanned, again time outside passage of first end next-door neighbour outermost passage is scanned, then scan time outside passage of the second end next-door neighbour outermost passage, so order is until the center passage of processed workpiece, the end of scan.
2. the sheet metal of a kind of continuous bend according to claim 1, wherein, described sheet metal is austenitic stainless steel thin plate or carbon steel thin plate, and thickness of slab is 0.1-0.15mm.
3. the sheet metal of a kind of continuous bend according to claim 1, wherein, step 2) in the fixing of processed workpiece be pressed in middle realization by two pieces of glass plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210595099.5A CN103111496B (en) | 2012-12-26 | 2012-12-26 | Progressive bending sheet metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210595099.5A CN103111496B (en) | 2012-12-26 | 2012-12-26 | Progressive bending sheet metal |
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| Publication Number | Publication Date |
|---|---|
| CN103111496A CN103111496A (en) | 2013-05-22 |
| CN103111496B true CN103111496B (en) | 2015-06-03 |
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| CN201210595099.5A Active CN103111496B (en) | 2012-12-26 | 2012-12-26 | Progressive bending sheet metal |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107159746A (en) * | 2017-06-12 | 2017-09-15 | 辽宁工业大学 | A kind of aluminium alloy sheet laser bend forming process |
| CN108856474B (en) * | 2018-07-12 | 2019-07-16 | 大连理工大学 | A kind of regulation of energy method reducing sheet metal laser bend forming amount of warpage |
| CN111360106B (en) * | 2020-02-20 | 2022-02-08 | 上海航天精密机械研究所 | Flexible loading platform suitable for laser bending forming of plate |
| CN112427543B (en) * | 2020-10-21 | 2021-09-07 | 大连理工大学 | Laser bending forming method for knife holder seat of knife switch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5359872A (en) * | 1991-08-29 | 1994-11-01 | Okuma Corporation | Method and apparatus for sheet-metal processing |
| CN101804508A (en) * | 2010-04-15 | 2010-08-18 | 上海交通大学 | Step type variable speed scanning method for accuracy control of laser bend forming |
| CN102632605A (en) * | 2012-04-05 | 2012-08-15 | 上海交通大学 | Method for carrying out laser heating forming on plate by clamping |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62134117A (en) * | 1985-12-05 | 1987-06-17 | Mitsubishi Electric Corp | Production of pipe |
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2012
- 2012-12-26 CN CN201210595099.5A patent/CN103111496B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5359872A (en) * | 1991-08-29 | 1994-11-01 | Okuma Corporation | Method and apparatus for sheet-metal processing |
| CN101804508A (en) * | 2010-04-15 | 2010-08-18 | 上海交通大学 | Step type variable speed scanning method for accuracy control of laser bend forming |
| CN102632605A (en) * | 2012-04-05 | 2012-08-15 | 上海交通大学 | Method for carrying out laser heating forming on plate by clamping |
Non-Patent Citations (2)
| Title |
|---|
| 扫描路径规划对激光弯曲成形影响的实验研究;管延锦 等;《锻压技术》;20050228(第1期);第36-38页，第50页 * |
| 金属板材直线单曲面激光弯曲成形研究;姜敏凤 等;《激光与光电子学进展》;20110831(第08期);第081408-1至081408-5页 * |
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| CN103111496A (en) | 2013-05-22 |
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