CN117799173B - Micro plastic part laser welding system and welding method - Google Patents
Micro plastic part laser welding system and welding method Download PDFInfo
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- CN117799173B CN117799173B CN202410233288.0A CN202410233288A CN117799173B CN 117799173 B CN117799173 B CN 117799173B CN 202410233288 A CN202410233288 A CN 202410233288A CN 117799173 B CN117799173 B CN 117799173B
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- 238000003466 welding Methods 0.000 title claims abstract description 258
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229920000426 Microplastic Polymers 0.000 title claims description 14
- 238000003825 pressing Methods 0.000 claims abstract description 109
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 229920003023 plastic Polymers 0.000 claims abstract description 30
- 239000004033 plastic Substances 0.000 claims abstract description 30
- 238000007493 shaping process Methods 0.000 claims description 29
- 230000000007 visual effect Effects 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 9
- 238000003763 carbonization Methods 0.000 claims description 7
- 230000003685 thermal hair damage Effects 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000000873 masking effect Effects 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 3
- 238000004023 plastic welding Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The invention provides a miniature plastic part laser welding system and a welding method, wherein a collapse value detection sensor is used for positioning the surface or a pressing block of a product, so that when a product fixing electric cylinder drives a pressing block to apply a pressurizing resultant force to the product to fix the product in a pressing way, the collapse value detection sensor is used for detecting whether the surface or the pressing block position of the product is deviated in real time, so that the pressing force is applied to the product by the pressing block, and collapse of the product due to excessive pressing is avoided; meanwhile, in the welding process of the welding part of the product, whether the surface of the product or the position of the pressing block is deviated or not is detected in real time by the collapse value detection sensor so as to judge whether the product is softened and deformed due to high temperature, so that the pressing block is continuously adjusted to apply compressive resultant force to the product, and collapse, deformation and damage are avoided in the welding process of the product; the invention belongs to the technical field of laser welding of plastic parts.
Description
Technical Field
The invention belongs to the technical field of plastic part laser welding, and particularly relates to a miniature plastic part laser welding system and a miniature plastic part laser welding method.
Background
With the continuous upgrading of technology and implementation of the green environmental protection concept in industrial production, production cost control and other aspects, plastic is taken as an excellent renewable nonmetallic material and is increasingly and widely applied to the design and manufacture of parts in various industries. Traditional metal parts are gradually replaced by plastic parts with the same performance, and meanwhile, higher requirements are also put on connection technology and welding quality between plastics, and the changes provide opportunities for welding plastics in various fields of automobiles, medical treatment, household appliances, consumer electronics and the like. The plastic laser welding is an important innovative technology, is a non-contact welding method, does not generate vibration, noise and dust in the welding process, and has unique application characteristics in the material connection and assembly process.
In a conventional plastic part laser welding system, a pressing fixture for fixing a product applies a fixed pressure value to the product in a welding process, so that the product is collapsed, deformed and damaged due to overlarge pressure value when the miniature plastic product is welded due to integral softening of the miniature plastic product at high temperature generated during welding; in addition, in some conventional laser welding processes for plastic parts, the welding efficiency is low by moving the laser focus point to walk around the welding part of the product to weld all parts of the product to be welded.
Disclosure of Invention
The invention aims to provide a micro plastic part laser welding system and a welding method, which are used for solving the technical problems in the background art.
The miniature plastic part laser welding system comprises a laser welding light path system and a pressing fixture, wherein the pressing fixture comprises a carrier plate, a product fixing electric cylinder and a collapse value detection sensor, the laser welding light path system is used for irradiating laser to a product welding part in the carrier plate, the product fixing electric cylinder is driven by a pressing block for pressing and fixing the product in the carrier plate, and the collapse value detection sensor is a displacement sensor or a distance sensor for positioning and detecting the position of the surface or the pressing block of the product;
the laser welding light path system comprises a laser light source, a collimation lens, a DOE shaping lens and a focusing lens which are sequentially arranged, and laser emitted by the laser light source passes through the laser light source, the collimation lens, the DOE shaping lens and the focusing lens to irradiate on a product welding part in the carrier plate;
A mask mechanism is arranged between the carrier plate and the focusing lens for irradiation, the mask mechanism comprises a left electric cylinder, a right electric cylinder, a front electric cylinder and a rear electric cylinder, the left electric cylinder is driven to be provided with a left mask plate, the right electric cylinder is driven to be provided with a right mask plate which can be close to the left mask plate, the front electric cylinder is driven to be provided with a front mask plate which is positioned above or below the right mask plate, the rear electric cylinder is driven to be provided with a rear mask plate which can be close to the front mask plate, and the left mask plate, the right mask plate, the front mask plate and the rear mask plate are mutually close to or open to present welding track holes with different positions and sizes.
According to the technical scheme, the miniature plastic part laser welding system can realize the following beneficial effects:
1. Positioning the surface or the pressing block of the product through the collapse value detection sensor so as to detect whether the surface or the pressing block position of the product is deviated in real time when the product is pressed and fixed by applying pressing force to the product by driving the pressing block by the product fixing electric cylinder to drive the pressing block, thereby applying pressing force to the product by the pressing block, and avoiding collapse of the product due to excessive pressing;
2. In the welding process of the welding part of the product, whether the surface of the product or the position of the pressing block is deviated or not is detected in real time by the collapse value detection sensor so as to judge whether the product is softened and deformed due to high temperature, thereby continuously adjusting the pressing block to apply compressive resultant force to the product and avoiding collapse, deformation and damage in the welding process of the product;
3. The pressing block is driven by the product fixing electric cylinder, so that the pressing block is accurately controlled to apply a pressing resultant force to the product;
4. When the collapse value detection sensor detects that the pressing block applies pressing force to the product, the collapse value detection sensor does not need to be in direct contact with the product or the pressing block, so that the service life of the collapse value detection sensor is prolonged, and indentation on the product or the pressing block is avoided;
5. The circular light spots output by the laser light source are shaped through the DOE shaping lens, so that the energy distribution of the light spots can be matched with the size of a welding part of a product, and the welding quality is improved;
6. and the overlarge light spot energy distribution range is avoided, so that the waste of power consumption is reduced.
Meanwhile, according to the technical scheme, the left electric cylinder drives the left mask plate to move, the right electric cylinder drives the right mask plate to move, the front electric cylinder drives the front mask plate to move, and the rear electric cylinder drives the rear mask plate to move, so that welding track holes which are formed above a product welding part and are matched with the product welding part in size, shape and position are formed among the left mask plate, the right mask plate, the front mask plate and the front mask plate, and the miniature plastic part laser welding system can further realize the following beneficial effects:
1. the welding track holes can be output through the laser welding light path system, so that the welding parts of products can be welded at one time, and the welding efficiency is improved;
2. in the process that laser irradiates the product through the welding track hole, the welding track hole can shape the irradiation shape, so that the laser can precisely irradiate the welding part of the product;
3. the mask plate shields the part of the product which does not need to be welded, so that the part of the product which does not need to be welded is protected;
4. when mass products are produced, capturing and positioning of welding parts of each product are not needed by utilizing a visual positioning unit, and laser can be irradiated to the welding parts of the products only by utilizing a carrier to position the products, so that the welding efficiency is further improved;
5. when the products are produced in a large batch, a visual positioning unit for capturing welding parts of the products is not required, so that the equipment cost is reduced;
6. The size, shape and position of the welding track hole are adjusted to adapt to welding parts of products in different batches, so that the universality of the miniature plastic part laser welding system is improved;
7. when welding different batches of products, the mask plate matched with the products does not need to be designed and processed, so that the welding cost is reduced.
To further optimize the above solution, it is optionally combined with one or more of the following embodiments without conflict.
In some embodiments, a group of reflecting lenses for changing the laser irradiation route is arranged between the DOE shaping lens and the focusing lens, and the laser welding light path system further comprises an infrared temperature sensor for detecting the temperature of the product welding part, wherein the infrared light of the infrared temperature sensor passes through the reflecting lenses and irradiates the product welding part in the carrier plate;
According to the technical scheme, the miniature plastic part laser welding system can further realize the following beneficial effects: in the welding process of the product, the temperature of the welding position of the welded product is monitored in real time through an infrared temperature sensor, the sensed temperature is compared with the upper limit of a set temperature value, and once the temperature exceeds the upper limit, the laser output power is adjusted, so that the temperature of the welding position is maintained within the range of the set value, and the thermal damage of the product or carbonization of plastics caused by overhigh laser power is avoided.
In some embodiments, the mask mechanism further comprises a longitudinal moving electric cylinder, wherein the longitudinal moving electric cylinder is driven by a longitudinal moving plate, the longitudinal moving plate is provided with a transverse moving electric cylinder, the transverse moving electric cylinder is driven by a transverse moving plate, the transverse moving plate is provided with a connecting rod, and the connecting rod is provided with a mask auxiliary baffle plate which moves on the welding track hole;
According to the technical scheme, the longitudinal moving cylinder drives the longitudinal moving plate to move so as to drive the mask auxiliary baffle to move longitudinally, and the transverse moving cylinder drives the transverse moving plate to move so as to drive the mask auxiliary baffle to move transversely, so that the mask auxiliary baffle can move into the welding track hole and move in the welding track hole, and a special-shaped hole is formed so as to further adapt to welding parts of different shapes.
In some embodiments, the masking mechanism is provided with a visual positioning unit for capturing the shape and position of the product weld site;
According to the technical scheme, when welding different batches of products, the shape and the position of the welding part of the product can be captured through the visual positioning unit, so that the size, the shape and the position of the welding track hole can be automatically adjusted, and the operation convenience of the miniature plastic part laser welding system can be improved.
Furthermore, the laser welding method is applied to the micro plastic part laser welding system, and comprises the following steps:
The method comprises the steps that firstly, a collapse value detection sensor locates the position of a product to be pressed or a pressing block, a product fixing electric cylinder drives the pressing block to apply pressing force to the product, so that the product is pressed and fixed, and meanwhile, the collapse value detection sensor detects whether the position of the product is deviated or not in real time, so that the pressing block is used for applying pressing force to the product, and collapse of the product due to excessive pressing is avoided;
Secondly, shaping the light spot output by the laser light source through a DOE shaping lens by the laser welding light path system to enable the energy distribution of the light spot to be matched with the size of a product welding position, and then intensively covering a welding track hole by a focusing lens, wherein the output light spot passes through the welding track hole and irradiates the product welding position in the carrier plate, so that the welding of all the product welding positions is completed at one time;
Meanwhile, the collapse value detection sensor detects whether the surface of the product or the position of the pressing block is deviated or not in real time, so that whether the product is softened and deformed due to high temperature is judged, the pressing block is continuously adjusted to apply compressive force to the product, and collapse or deformation in the welding process of the product is avoided.
In some embodiments, the first step is preceded by the preliminary step of:
Preparing a first step, wherein a visual positioning unit captures the shape and the position of a welding part of a captured product;
Preparing a second step, wherein a left electric cylinder drives a left mask plate to move, a right electric cylinder drives a right mask plate to move, a front electric cylinder drives a front mask plate to move, and a rear electric cylinder drives a rear mask plate to move, so that welding track holes which are arranged above a product welding part and are matched with the product welding part in size and shape are formed among the left mask plate, the right mask plate, the front mask plate and the rear mask plate, and laser can penetrate through the welding track holes to finish welding of the product welding part at one time.
In some embodiments, during the second step, the infrared temperature sensor monitors the temperature of the welding location of the welded product in real time, compares the sensed temperature with a set upper temperature value limit, and adjusts the laser output power once the temperature exceeds the upper limit, so as to maintain the temperature of the welding location within the set value range, thereby avoiding thermal damage to the product or carbonization of the plastic caused by the excessive laser power.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings and numerals that are required to be used in the description of the embodiments will be briefly described.
FIG. 1 is a schematic view of the principle of spot shaping of a laser welding optical path system according to the present invention;
Fig. 2 is a schematic layout diagram of a laser welding optical path system according to the present invention:
FIG. 3 is a schematic structural diagram of the press-fit jig according to the present invention;
FIG. 4 is a schematic view of spot brightness after spot shaping and concentration;
FIG. 5 is a schematic layout of a mask plate or a mask mechanism according to the present invention;
Fig. 6 is a schematic structural view of a mask mechanism according to the present invention.
Reference numerals:
1. A laser welding light path system; 11. a laser light source; 12. a collimating optic; 13. DOE shaping lenses; 14. a focusing lens; 15. a reflection lens; 16. an infrared temperature sensor; 2. pressing fixture; 21. a carrier plate; 22. a product fixing electric cylinder; 23. a collapse value detection sensor; 24. briquetting; 3. welding track holes; 30a, mask plate; 30b, a mask mechanism; 31. a left electric cylinder; 32. a left mask plate; 33. a right electric cylinder; 34. a right mask plate; 35. a front electric cylinder; 36. a front mask plate; 37. a rear electric cylinder; 38. a rear mask plate; 41. a longitudinal moving electric cylinder; 42. a longitudinally moving plate; 43. a transverse moving electric cylinder; 44. a transverse moving plate; 45. a connecting rod; 46. a mask auxiliary baffle; 5. and (5) a product.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 6, the present embodiment provides a laser welding system and a welding method for micro plastic parts.
The miniature plastic part laser welding system comprises a laser welding light path system 1 and a pressing jig 2.
The pressing fixture 2 comprises a carrier plate 21, a product fixing electric cylinder 22 and a collapse value detection sensor 23, wherein the carrier plate 21 is used for placing a product 5, the laser welding light path system 1 is used for irradiating laser to a welding part of the product 5 in the carrier plate 21, the product fixing electric cylinder 22 is driven with a pressing block 24 for pressing and fixing the product 5 in the carrier plate, and the collapse value detection sensor 23 is a displacement sensor or a distance sensor for positioning and detecting the position of the surface or the pressing block 24 of the product 5;
The position of the surface of the product 5 or the pressing block 24 is positioned through the collapse value detection sensor 23, so that when the product fixing cylinder 22 drives the pressing block 24 to apply a pressing resultant force to the product 5 to fix the product 5 in a pressing manner, the collapse value detection sensor 23 detects whether the surface of the product 5 or the position of the pressing block 24 deviates in real time, and the pressing force is applied to the product 5 by the pressing block 24, so that collapse of the product 5 caused by excessive pressing is avoided; meanwhile, in the welding process of the welding part of the product 5, whether the surface of the product 5 or the position of the pressing block 24 is deviated or not is detected in real time by the collapse value detection sensor 23 so as to judge whether the product 5 is softened and deformed due to high temperature, so that the pressing block 24 is continuously adjusted to apply compressive resultant force to the product 5, and collapse, deformation and damage are avoided in the welding process of the product 5; in addition, the pressing block 24 is driven by the product fixing electric cylinder 22, so that the pressing block 24 is accurately controlled to apply pressing force to the product 5, and the collapse value detection sensor does not need to be in direct contact with the product or the pressing block when detecting that the pressing block applies pressing force to the product, so that the service life of the collapse value detection sensor is prolonged, and indentation is avoided on the product or the pressing block.
Further, the laser welding light path system 1 comprises a laser light source 11, a collimating lens 12, a DOE shaping lens 13 and a focusing lens 14 which are sequentially arranged, and laser emitted by the laser light source 11 passes through the laser light source 11, the collimating lens 12, the DOE shaping lens 13 and the focusing lens 14 to irradiate on a welding part of a product 5 in the carrier plate; the circular light spots output by the laser source 11 are shaped through the DOE shaping lens 13, so that the energy distribution of the light spots is matched with the welding position size of the product 5, namely, the energy of the light spots can be larger than the welding position of the product 5 and can cover the welding track holes 3, the energy distribution of the light spots is uniform, the welding quality is improved, meanwhile, the overlarge energy distribution range of the light spots is avoided, and the waste of power consumption is reduced.
Further, a group of reflecting lenses 15 for changing the laser irradiation route are arranged between the DOE shaping lens 13 and the focusing lens 14, the laser welding light path system 1 further comprises an infrared temperature sensor 16 for detecting the temperature of the welding part of the product 5, and infrared light of the infrared temperature sensor 16 passes through the reflecting lenses 15 and irradiates to the welding part of the product 5 in the carrier plate;
In the process of welding the product 5, the temperature of the welding position of the welded product 5 is monitored in real time through the infrared temperature sensor 16, the sensed temperature is compared with the upper limit of the set temperature value, once the temperature exceeds the upper limit, the laser output power is adjusted, and the temperature of the welding position is maintained within the set value range, so that the thermal damage of the product 5 or carbonization of plastics caused by overhigh laser power is avoided.
Further, a mask plate 30a is arranged between the carrier plate and the irradiation of the focusing lens 14, the mask plate 30a is provided with a welding track hole 3 matched with the shape of the welding part of the product 5, and laser passes through the welding track hole 3 to irradiate the welding part of the product 5;
Outputting and covering the welding track hole 3 through the laser welding light path system 1, so that the welding part of the product 5 can be welded at one time; in the process that the laser irradiates the product 5 through the welding track hole 3, the welding track hole 3 can shape the irradiation shape, so that the laser can precisely irradiate the welding part of the product 5; meanwhile, the mask plate 30a shields the part of the product 5 which is not required to be welded, so that the part of the product 5 which is not required to be welded is prevented from being fused by mistake; in addition, when a large number of products 5 are produced, the welding part of each product 5 does not need to be captured by a visual positioning unit, so that the welding efficiency is further improved; or in the case of mass production of the products 5, it is possible to eliminate the need for providing a visual positioning unit for capturing the welding sites of the products 5, thereby reducing the equipment costs.
In some embodiments, a mask mechanism 30b is arranged between the carrier plate and the irradiation of the focusing lens 14, the mask mechanism 30b comprises a left electric cylinder 31, a right electric cylinder 33, a front electric cylinder 35 and a rear electric cylinder 37, the left electric cylinder 31 is driven by the left mask plate 32, the right electric cylinder 33 is driven by the right mask plate 34 which can be close to the left mask plate 32, the front electric cylinder 35 is driven by the front mask plate 36 which is positioned above or below the right mask plate 34, the rear electric cylinder 37 is driven by the rear mask plate 38 which can be close to the front mask plate 36, and the left mask plate 32, the right mask plate 34, the front mask plate 36 and the rear mask plate 38 are mutually close to or open to present welding track holes 3 with different positions and sizes;
The left electric cylinder 31 drives the left mask plate 32 to move, the right electric cylinder 33 drives the right mask plate 34 to move, the front electric cylinder 35 drives the front mask plate 36 to move, the rear electric cylinder 37 drives the rear mask plate 38 to move, so that welding track holes 3 matched with the size, shape and position of the welding position of the product 5 are formed above the welding position of the product 5 between the left mask plate 32, the right mask plate 34, the front mask plate 36 and the rear mask plate 38, when different batches of products 5 are welded, the size, shape and position of the welding track holes 3 can be adjusted to adapt to the welding positions of the different batches of products 5, the universality of the miniature plastic part laser welding system is improved, and meanwhile, when the products 5 of different batches are welded, the mask plate 30a matched with the products 5 does not need to be designed and processed, so that the welding cost is reduced.
Further, the mask mechanism 30b further comprises a longitudinal moving cylinder 41, the longitudinal moving cylinder 41 is driven with a longitudinal moving plate 42, the longitudinal moving plate 42 is provided with a transverse moving cylinder 43, the transverse moving cylinder 43 is driven with a transverse moving plate 44, the transverse moving plate 44 is provided with a connecting rod 45, and the connecting rod 45 is provided with a mask auxiliary baffle 46 which is positioned on the welding track hole 3 to move; the vertical moving cylinder 41 drives the vertical moving plate 42 to move so as to drive the mask auxiliary baffle 46 to move vertically, and the horizontal moving cylinder 43 drives the horizontal moving plate 44 to move so as to drive the mask auxiliary baffle 46 to move horizontally, so that the mask auxiliary baffle 46 can move into the welding track hole 3, and the welding track hole 3 forms a special-shaped hole (such as a square hole, an O-shaped hole or an L-shaped hole) so as to further adapt to welding parts with different shapes.
Further, the mask mechanism 30b is provided with a visual positioning unit for capturing the shape and position of the welding site of the product 5; when different batches of products 5 are welded, the shape and the position of the welding part of the products 5 can be captured through the visual positioning unit, so that the size, the shape and the position of the welding track hole 3 can be automatically adjusted, and the operation convenience of the micro plastic part laser welding system can be improved.
The laser welding method is applied to the miniature plastic part laser welding system and comprises the following steps of:
The first step, the collapse value detection sensor 23 locates the position given to the surface of the product 5 or the pressing block 24, the product fixing electric cylinder 22 drives the pressing block 24 to apply a pressing resultant force to the product 5, so that the product 5 is pressed and fixed, and meanwhile, the collapse value detection sensor 23 detects whether the surface of the product 5 or the position of the pressing block 24 deviates in real time, so that the pressing force is applied to the product 5 by the pressing block 24, and collapse of the product 5 caused by excessive pressing is avoided;
Secondly, the laser welding light path system 1 performs shaping through a circular light spot output by the laser source 11 of the DOE shaping lens 13 to enable the light spot to be matched with the size of a welded part of the product 5, and then the focusing lens 14 intensively covers the welding track hole 3 so that a center 1E+0.00 part shown in fig. 4 is covered on the welding track hole 3, and at the moment, the output light spot irradiates the welded part of the product 5 in the carrier plate through the welding track hole 3 to finish welding all the welded parts of the product 5 at one time;
Meanwhile, the collapse value detecting sensor 23 detects whether the surface of the product 5 or the position of the pressing block 24 is deviated in real time, so that whether the product 5 is softened and deformed due to high temperature is judged, and the pressing block 24 is continuously adjusted to apply compressive force to the product 5, so that collapse or deformation in the welding process of the product 5 is avoided.
Further, the method comprises the following preliminary steps before the first step:
preparing a first step, wherein a visual positioning unit captures the shape and the position of a welding part of a captured product 5;
Preparing a second step, wherein the left electric cylinder 31 drives the left mask plate 32 to move, the right electric cylinder 33 drives the right mask plate 34 to move, the front electric cylinder 35 drives the front mask plate 36 to move, and the rear electric cylinder 37 drives the rear mask plate 38 to move, so that a welding track hole 3 matched with the welding position of the product 5 in size and shape is formed above the welding position of the product 5 between the left mask plate 32, the right mask plate 34, the front mask plate 36 and the rear mask plate 38, and the laser can penetrate through the welding track hole 3 to finish welding the welding position of the product 5 at one time.
Further, during the execution of the second step, the infrared temperature sensor 16 monitors the temperature of the welding position of the welded product 5 in real time, compares the sensed temperature with the upper limit of the set temperature value, and adjusts the laser output power once the temperature exceeds the upper limit, so as to maintain the temperature of the welding position within the set value range, thereby avoiding thermal damage of the product 5 or carbonization of plastic caused by the overhigh laser power.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following examples are now presented.
Examples
As shown in fig. 1 to 5, the present embodiment provides a micro plastic part laser welding system, which includes a press fixture 2 and a laser welding light path system 1.
The press-fit jig 2 comprises a carrier plate 21, a product fixing electric cylinder 22 and a collapse value detection sensor 23, wherein the product fixing electric cylinder 22 is driven by a pressing block 24 for press-fitting and fixing the product 5 in the carrier plate, and the collapse value detection sensor 23 is a displacement sensor or a distance sensor for giving the surface of the product 5 or the position of the pressing block 24 to locate and detect the position.
The laser welding light path system 1 comprises a laser light source 11, a collimating lens 12, a DOE shaping lens 13, a focusing lens 14 and an infrared temperature sensor 16 which are sequentially arranged, wherein laser emitted by the laser light source 11 passes through the laser light source 11, the collimating lens 12, the DOE shaping lens 13 and the focusing lens 14 to irradiate onto a product 5 welding part in a carrier plate, a group of reflecting lenses 15 for changing a laser irradiation route are arranged between the DOE shaping lens 13 and the focusing lens 14, so that infrared light of the infrared temperature sensor 16 can pass through the reflecting lenses 15 to irradiate onto a product 5 welding part in the carrier plate, and the temperature of the product 5 welding part is detected.
A mask plate 30a is arranged between the carrier plate and the irradiation of the focusing lens 14, the mask plate 30a is provided with a welding track hole 3 matched with the shape of the welding part of the product 5, and laser passes through the welding track hole 3 to irradiate the welding part of the product 5.
The following is a welding method of the micro plastic part laser welding system according to the embodiment:
The first step, the collapse value detection sensor 23 locates the position given to the surface of the product 5 or the pressing block 24, the product fixing electric cylinder 22 drives the pressing block 24 to apply a pressing resultant force to the product 5, so that the product 5 is pressed and fixed, and meanwhile, the collapse value detection sensor 23 detects whether the surface of the product 5 or the position of the pressing block 24 deviates in real time, so that the pressing force is applied to the product 5 by the pressing block 24, and collapse of the product 5 caused by excessive pressing is avoided;
Secondly, the laser welding light path system 1 performs shaping through a circular light spot output by the laser light source 11 of the DOE shaping lens 13, so that the energy distribution of the light spot is matched with the size of the welding part of the product 5, namely the energy of the light spot can cover the welding part of the product 5 and can cover the welding track hole 3, and then the light spot is concentrated to cover the welding track hole 3 through the focusing lens 14, so that the central 1E+0.00 part shown in fig. 4 is covered on the welding track hole 3, and at the moment, the output light spot passes through the welding track hole 3 and irradiates to the welding part of the product 5 in the carrier plate, so that the welding is completed at one time at all the welding parts of the product 5;
In the second step, the collapse value detecting sensor 23 detects in real time whether the surface of the product 5 or the position of the pressing block 24 is deviated, thereby judging whether the product 5 is softened and deformed due to high temperature, thereby continuously adjusting the pressing block 24 to apply compressive force to the product 5, thereby avoiding collapse or deformation during welding of the product 5,
At the same time, the infrared temperature sensor 16 monitors the temperature of the welding position of the welded product 5 in real time, compares the sensed temperature with the upper limit of the set temperature value, and adjusts the laser output power once the temperature exceeds the upper limit, so that the temperature of the welding position is maintained within the set value range, thereby avoiding thermal damage of the product 5 or carbonization of plastics caused by overhigh laser power.
Examples
As shown in fig. 1 to 6, the present embodiment provides a micro plastic part laser welding system, which includes a press fixture 2 and a laser welding light path system 1.
The press-fit jig 2 comprises a carrier plate 21, a product fixing electric cylinder 22 and a collapse value detection sensor 23, wherein the product fixing electric cylinder 22 is driven by a pressing block 24 for press-fitting and fixing the product 5 in the carrier plate, and the collapse value detection sensor 23 is a displacement sensor or a distance sensor for giving the surface of the product 5 or the position of the pressing block 24 to locate and detect the position.
The laser welding light path system 1 comprises a laser light source 11, a collimating lens 12, a DOE shaping lens 13, a focusing lens 14 and an infrared temperature sensor 16 which are sequentially arranged, wherein laser emitted by the laser light source 11 passes through the laser light source 11, the collimating lens 12, the DOE shaping lens 13 and the focusing lens 14 to irradiate onto a product 5 welding part in a carrier plate, a group of reflecting lenses 15 for changing a laser irradiation route are arranged between the DOE shaping lens 13 and the focusing lens 14, so that infrared light of the infrared temperature sensor 16 can pass through the reflecting lenses 15 to irradiate onto a product 5 welding part in the carrier plate, and the temperature of the product 5 welding part is detected.
A mask mechanism 30b is arranged between the carrier plate and the irradiation of the focusing lens 14, and the mask mechanism 30b comprises a left electric cylinder 31, a right electric cylinder 33, a front electric cylinder 35, a rear electric cylinder 37, a longitudinal movement electric cylinder 41 and a visual positioning unit; the left electric cylinder 31 is driven with a left mask plate 32, the right electric cylinder 33 is driven with a right mask plate 34 which can be close to the left mask plate 32, the front electric cylinder 35 is driven with a front mask plate 36 which is positioned above or below the right mask plate 34, the rear electric cylinder 37 is driven with a rear mask plate 38 which can be close to the front mask plate 36, and the left mask plate 32, the right mask plate 34, the front mask plate 36 and the rear mask plate 38 are mutually close or open to present welding track holes 3 with different positions and sizes; the longitudinal moving electric cylinder 41 is driven with a longitudinal moving plate 42, the longitudinal moving plate 42 is provided with a transverse moving electric cylinder 43, the transverse moving electric cylinder 43 is driven with a transverse moving plate 44, the transverse moving plate 44 is provided with a connecting rod 45, and the connecting rod 45 is provided with a mask auxiliary baffle 46 which is positioned on the welding track hole 3 to move; the visual positioning unit is used to capture the shape and position of the welding site of the product 5.
The following is a welding method of the micro plastic part laser welding system according to the embodiment:
The method comprises the steps that firstly, when a new batch of products 5 are welded, a visual positioning unit captures and captures the shape and the position of a welding part of the products 5;
Secondly, the left electric cylinder 31 drives the left mask plate 32 to move, the right electric cylinder 33 drives the right mask plate 34 to move, the front electric cylinder 35 drives the front mask plate 36 to move, and the rear electric cylinder 37 drives the rear mask plate 38 to move, so that welding track holes 3 with the sizes and shapes matched with those of the welding parts of the product 5 are formed above the welding parts of the product 5 among the left mask plate 32, the right mask plate 34, the front mask plate 36 and the rear mask plate 38, and the laser can penetrate through the welding track holes 3 to finish welding the welding parts of the product 5 at one time;
Alternatively, the vertical moving cylinder 41 drives the vertical moving plate 42 to move so as to drive the mask auxiliary baffle 46 to move vertically, and the horizontal moving cylinder 43 drives the horizontal moving plate 44 to move so as to drive the mask auxiliary baffle 46 to move horizontally, so that the mask auxiliary baffle 46 can move into the welding track hole 3, and the welding track hole 3 presents a special-shaped hole (such as a mouth-shaped hole or an L-shaped hole) which is matched with the shape of the welding part of the product 5;
Thirdly, the collapse value detection sensor 23 positions the surface of the product 5 or the position of the pressing block 24, the product fixing electric cylinder 22 drives the pressing block 24 to apply a pressing resultant force to the product 5, so that the product 5 is pressed and fixed, and meanwhile, the collapse value detection sensor 23 detects whether the surface of the product 5 or the position of the pressing block 24 deviates in real time, so that the pressing force is applied to the product 5 by the pressing block 24, and collapse of the product 5 caused by excessive pressing is avoided;
Fourthly, the laser welding light path system 1 carries out shaping through a circular light spot output by the laser light source 11 of the DOE shaping lens 13, so that the energy distribution of the light spot is matched with the size of the welding part of the product 5, namely the energy of the light spot can cover the welding part of the product 5 and can cover the welding track hole 3, and then the light spot is concentrated to cover the welding track hole 3 through the focusing lens 14, so that the center 1E+0.00 part shown in fig. 4 is covered on the welding track hole 3, and at the moment, the output light spot passes through the welding track hole 3 and irradiates to the welding part of the product 5 in the carrier plate, so that the welding is finished at one time at all the welding parts of the product 5;
In the fourth step, the collapse value detecting sensor 23 detects in real time whether the surface of the product 5 or the position of the pressing block 24 is deviated, thereby judging whether the product 5 is softened and deformed due to high temperature, thereby continuously adjusting the pressing block 24 to apply compressive force to the product 5, thereby avoiding collapse or deformation during welding of the product 5,
At the same time, the infrared temperature sensor 16 monitors the temperature of the welding position of the welded product 5 in real time, compares the sensed temperature with the upper limit of the set temperature value, and adjusts the laser output power once the temperature exceeds the upper limit, so that the temperature of the welding position is maintained within the set value range, thereby avoiding thermal damage of the product 5 or carbonization of plastics caused by overhigh laser power.
Claims (7)
1. The utility model provides a miniature working of plastics laser welding system, its characterized in that includes laser welding light path system (1) and pressfitting tool (2): the pressing fixture (2) comprises a carrier plate (21), a product fixing electric cylinder (22) and a collapse value detection sensor (23), wherein the laser welding light path system (1) is used for irradiating laser to a welding part of a product (5) in the carrier plate (21), the product fixing electric cylinder (22) is driven with a pressing block (24) for pressing and fixing the product (5) in the carrier plate, and the collapse value detection sensor (23) is a displacement sensor or a distance sensor for positioning and detecting the position of the surface or the pressing block (24) of the product (5);
The laser welding light path system (1) comprises a laser light source (11), a collimating lens (12), a DOE shaping lens (13) and a focusing lens (14) which are sequentially arranged, wherein laser emitted by the laser light source (11) passes through the collimating lens (12), the DOE shaping lens (13) and the focusing lens (14) to irradiate on a welding part of a product (5) in a carrier plate;
Be provided with mask mechanism (30 b) between carrier plate (21) with focus lens (14) are shone, mask mechanism (30 b) include left electric jar (31), right electric jar (33), preceding electric jar (35) and back electric jar (37), left side electric jar (31) drive has left mask (32), right side electric jar (33) drive have can with right mask (34) of left mask (32) close together, preceding electric jar (35) drive have preceding mask (36) that are located right mask (34) top or below, back electric jar (37) drive have can with back mask (38) of preceding mask (36) close together, left side mask (32), right side mask (34), preceding mask (36) and back mask (38) are through closing together or opening each other in order to present welding track hole (3) of different positions and sizes.
2. A micro plastic part laser welding system according to claim 1, wherein: a group of reflecting lenses (15) for changing the laser irradiation route are arranged between the DOE shaping lenses (13) and the focusing lenses (14), the laser welding light path system (1) further comprises an infrared temperature sensor (16) for detecting the temperature of the welding part of the product (5), and infrared light of the infrared temperature sensor (16) passes through the reflecting lenses (15) and irradiates the welding part of the product (5) in the carrier plate.
3. A micro plastic part laser welding system according to claim 1, wherein: mask mechanism (30 b) still includes indulges and moves electric jar (41), indulge and move electric jar (41) drive and have indulge and move board (42), indulge and move board (42) and install sideslip electric jar (43), sideslip electric jar (43) drive has sideslip board (44), sideslip board (44) are equipped with connecting rod (45), connecting rod (45) are equipped with can be located mask auxiliary baffle (46) that move on welding track hole (3).
4. A micro plastic part laser welding system according to claim 3, wherein: the masking mechanism (30 b) is provided with a visual positioning unit for capturing the shape and position of the welding part of the product (5).
5. A laser welding method applied to the micro plastic part laser welding system according to any one of claims 1 to 4, comprising the steps of:
The method comprises the steps that firstly, a collapse value detection sensor (23) positions the surface of a product (5) or a pressing block (24), a product fixing electric cylinder (22) drives the pressing block (24) to apply a pressing force to the product (5) so as to fix the product (5) in a pressing way, and meanwhile, the collapse value detection sensor (23) detects whether the surface of the product (5) or the position of the pressing block (24) deviates in real time so as to apply pressing force to the product (5) by the pressing block (24), so that collapse of the product (5) caused by excessive pressing is avoided;
secondly, the laser welding light path system (1) shapes the light spot output by the laser light source (11) through the DOE shaping lens (13) to enable the energy distribution of the light spot to be matched with the size of the welding part of the product (5), then the focusing lens (14) intensively covers the welding track hole (3) with the light spot, at the moment, the output light spot passes through the welding track hole (3) to irradiate to the welding part of the product (5) in the carrier plate, and the welding is completed at one time with all the welding parts of the product (5),
Meanwhile, the collapse value detection sensor (23) detects whether the surface of the product (5) or the position of the pressing block (24) deviates in real time, so that whether the product (5) is softened and deformed due to high temperature is judged, the pressing block (24) is continuously adjusted to apply pressing force to the product (5), and collapse or deformation of the product (5) in the welding process is avoided.
6. The laser welding method according to claim 5, wherein: the first step is preceded by a preliminary step,
Preparing a first step, wherein a visual positioning unit captures the shape and the position of a welding part of a product (5);
Preparing a second step, wherein a left electric cylinder (31) drives a left mask plate (32) to move, a right electric cylinder (33) drives a right mask plate (34) to move, a front electric cylinder (35) drives a front mask plate (36) to move, and a rear electric cylinder (37) drives a rear mask plate (38) to move, so that welding track holes (3) matched with the welding position of the product (5) in size and shape are formed above the welding position of the product (5) between the left mask plate (32), the right mask plate (34), the front mask plate (36) and the rear mask plate (38), and the laser can penetrate through the welding track holes (3) to finish welding the welding position of the product (5) at one time.
7. The laser welding method according to claim 6, wherein: during the second step, the infrared temperature sensor (16) monitors the temperature of the welding position of the welded product (5) in real time, compares the sensed temperature with the upper limit of the set temperature value, and adjusts the laser output power once the temperature exceeds the upper limit, so that the temperature of the welding position is maintained within the set value range, thereby avoiding the thermal damage of the product (5) or carbonization of plastics caused by the overhigh laser power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT501241A1 (en) * | 2004-12-29 | 2006-07-15 | Sticht Fertigungstech Stiwa | Automated metalworking process to machine and join two components has two simultaneously operated machining stations linked by a third machining and joining station |
| CN110875970A (en) * | 2018-08-30 | 2020-03-10 | 苹果公司 | Housing and antenna architecture for mobile devices |
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| US5578227A (en) * | 1996-11-22 | 1996-11-26 | Rabinovich; Joshua E. | Rapid prototyping system |
| JP5727433B2 (en) * | 2012-09-04 | 2015-06-03 | イムラ アメリカ インコーポレイテッド | Transparent material processing with ultrashort pulse laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT501241A1 (en) * | 2004-12-29 | 2006-07-15 | Sticht Fertigungstech Stiwa | Automated metalworking process to machine and join two components has two simultaneously operated machining stations linked by a third machining and joining station |
| CN110875970A (en) * | 2018-08-30 | 2020-03-10 | 苹果公司 | Housing and antenna architecture for mobile devices |
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