CN103817926A - Method for welding plastic parts by utilizing laser - Google Patents
Method for welding plastic parts by utilizing laser Download PDFInfo
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- CN103817926A CN103817926A CN201210465744.1A CN201210465744A CN103817926A CN 103817926 A CN103817926 A CN 103817926A CN 201210465744 A CN201210465744 A CN 201210465744A CN 103817926 A CN103817926 A CN 103817926A
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Abstract
The invention discloses a method for welding plastic parts by utilizing laser. The method comprises the following steps: 1) adopting a special computer control board card to output near infrared ray laser with certain frequency and wavelength of 800-1064 nm, wherein the deflected distance of the focus is 60-90 mm, and the spot diameter is 4-5 mm; 2) clamping the two plastic parts to be welded together, enabling the near infrared ray laser to transmit the first part in a focus deflected manner, and then to be absorbed by the second part, transferring the absorbed near infrared ray laser to heat, and melting the contact surface of the two parts to form a welding zone. The laser welding method disclosed by the invention can be used for welding large welding zones and shorten the welding time.
Description
Technical field
The invention belongs to laser welding technology field, be specifically related to a kind of method of utilizing plastic welding laser part.
Background technology
Welding is by heat energy or the vibration energy, makes the softening and method that combines of material surface.Welding product have restriction to a certain degree at the design aspect of shape, although do not use adhesive, can obtain reasonable weld strength.The method of welding can be divided into following several by adopted softening mode: hot plate welding, the pressurization welding method of the softening composition surface of the heat being produced by hot plate; Vibration Welding, by the pressurization welding method of the softening composition surface of fricative heat; Ultrasonic bonding, the pressurization welding method of the thermal softening composition surface being produced by intermolecular mechanical oscillation kinetic energy under supersonic frequency; High-frequency welding, the pressurization welding method of the softening composition surface of the heat being produced by high-frequency electric field.
Traditional Plastic Welding is to adopt the mode of heating to realize, and heat affected area is large, and surface has distortion, thereby affects outward appearance.And the vibration stress of welded articles and thermal stress very large, this means that the aging speed of goods or device intraware is very fast, greatly shortened service life of product.And as method for laser welding, in the welding of plastics, it can use continuous joint welding or sweep type welding.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of quick and high-quality part method for laser welding for plastics, and method for laser welding of the present invention can be used for welding large-scale welding region and can shorten weld interval.
A kind of method of utilizing plastic welding laser part of the present invention, comprises the steps:
1), adopt computer control Special-purpose plate card, the near infrared ray laser that output certain frequency, wavelength are 800～1064nm; The distance that focus departs from is 60～90mm, and spot diameter is 4～5mm;
2), two plastic components to be welded are clamped together, allow near infrared ray laser in the mode of off-focal transmitted through first parts, then absorbed by second parts, the near infrared ray laser absorbing turns to heat energy, by the contact surface fusing of two parts, form weld zone.
Above-mentioned bonding machine is semiconductor laser bonding machine, optical-fiber laser bonding machine or end pumping photocoagulator.
Above-mentioned welding condition is as follows: electric current is 150～180 A, and pulsewidth is 8～10 ms, and frequency is 2 Hz, and speed is 2700 mm/s.
Compared with prior art, the invention has the beneficial effects as follows:
That welding method of the present invention can generate is accurate, firmly and the welding of sealing (airtight and water-tight), and the chip of resin less degradation, generation is few, the surface of goods can link together closely around weld seam; Welding method is easy to control, and has good adaptability, workpiece that can weld size is little or contour structures is complicated; Greatly reduce vibration stress and the thermal stress of goods, more much smaller than the vibration stress and the thermal stress that adopt other connected mode to produce; Materials different numerous species can be welded together; Owing to departing from focal length welding, welding hot spot is large, and frequency that only need to be very low just can realize high-speed welding, is three times of general Plastic Welding efficiency.
The specific embodiment
A method of utilizing plastic welding laser part, comprises the steps: 1), adopt computer control Special-purpose plate card, the near infrared ray laser that output certain frequency, wavelength are 800～1064nm; The distance that focus departs from is 60～90mm, and spot diameter is 4～5mm; 2), two plastic components to be welded are clamped together, allow near infrared ray laser in the mode of off-focal transmitted through first parts, then absorbed by second parts, the near infrared ray laser absorbing turns to heat energy, by the contact surface fusing of two parts, form weld zone.Operation principle is: on laser line focus lens projects to the two block plastics that laser instrument produces, form hot spot through after transparent plastic in opaque plastic, finally focus on focal plane.Because bonding machine laser beam divergence degree is little, optical mode well will, conventionally its spot size 0.06mm in the time of the mark of focal position, to precise plastic, welding provides feasibility foundation like this, mark is the location marking that high-speed vibrating mirror has swung optical coordinate point position, in the time adopting plastic components as mark element, due to the absorption of plastics to optical maser wavelength, on the lines of laser scanning, can produce like this processing hot melt vestige, utilize this characteristic, the track that utilizes the principle of mark to complete mark is realized the function of Plastic Welding.
Connect the selection of focal length, when common welding work pieces, be in laser off-focal 4mm, the defocusing of long distance is to play leveling effect attractive in appearance after being used in welding fabrication.If but while carrying out Plastic Welding on the position of off-focal 30～50mm, just can reach Plastic Welding firmly.During with this equipment welding plastic, must out of focus weld, when reason is the welding of positive focus because power density is high, plastics to the absorption of optical maser wavelength generally at 810～980nm, and while adopting 1064nm wavelength, plastics are not just fine to the absorption of laser, in the time of positive focus welding, be easy to the upper surface burn of plastics like this, do not reach welding requirements, evidence is offset on not far position and welds in focal position, its upper surface transparent plastic has serious burn, and there will be irregular drilling point.
Nearly all thermoplastic and thermoplastic elastomer (TPE) can use laser welding technology of the present invention, conventional welding material has PP, PS, PC, ABS, polyamide, polyformaldehyde etc., and other some engineering plastics are as polyphenylene thioether PPS and liquid crystal polymer etc., because having compared with low laser transmittance, it is not too applicable to using laser welding technology, therefore usually on primer, add carbon black, to can absorb enough energy, thereby meet the requirement that laser-transmitting welds.
Above-described embodiment only illustrates principle of the present invention and effect thereof, for the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, all belongs to protection scope of the present invention.
Claims (2)
1. utilize a method for plastic welding laser part, it is characterized in that comprising the steps:
1), adopt computer control Special-purpose plate card, the near infrared ray laser that output certain frequency, wavelength are 800～1064nm; The distance that focus departs from is 60～90mm, and spot diameter is 4～5mm;
2), two plastic components to be welded are clamped together, allow near infrared ray laser in the mode of off-focal transmitted through first parts, then absorbed by second parts, the near infrared ray laser absorbing turns to heat energy, by the contact surface fusing of two parts, form weld zone.
2. a kind of method of utilizing plastic welding laser according to claim 1, is characterized in that: described bonding machine is semiconductor laser bonding machine, optical-fiber laser bonding machine or end pumping photocoagulator; Described welding condition is as follows: electric current is 150～180 A, and pulsewidth is 8～10 ms, and frequency is 2 Hz, and speed is 2700 mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210465744.1A CN103817926A (en) | 2012-11-17 | 2012-11-17 | Method for welding plastic parts by utilizing laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210465744.1A CN103817926A (en) | 2012-11-17 | 2012-11-17 | Method for welding plastic parts by utilizing laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103817926A true CN103817926A (en) | 2014-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210465744.1A Pending CN103817926A (en) | 2012-11-17 | 2012-11-17 | Method for welding plastic parts by utilizing laser |
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| CN (1) | CN103817926A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106414037A (en) * | 2014-06-03 | 2017-02-15 | Lpkf激光电子股份公司 | Method and device for welding two thermoplastic parts to be joined along a weld seam by means of a laser |
| CN109421280A (en) * | 2017-08-24 | 2019-03-05 | 上海肇民新材料科技有限公司 | A kind of method for laser welding for thermoplastic |
| CN110252146A (en) * | 2019-06-28 | 2019-09-20 | 时代沃顿科技有限公司 | A kind of welding method of MBR flat membrane component |
-
2012
- 2012-11-17 CN CN201210465744.1A patent/CN103817926A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106414037A (en) * | 2014-06-03 | 2017-02-15 | Lpkf激光电子股份公司 | Method and device for welding two thermoplastic parts to be joined along a weld seam by means of a laser |
| CN109421280A (en) * | 2017-08-24 | 2019-03-05 | 上海肇民新材料科技有限公司 | A kind of method for laser welding for thermoplastic |
| CN110252146A (en) * | 2019-06-28 | 2019-09-20 | 时代沃顿科技有限公司 | A kind of welding method of MBR flat membrane component |
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Application publication date: 20140528 |