Transparent workpiece laser welding jig and device

Abstract

The invention provides a transparent workpiece laser welding jig and device, the transparent workpiece laser welding jig comprises a carrying table, the carrying table comprises a heating base and a carrying disc for transparent workpiece welding, a constant-temperature heating device is arranged in the heating base, and the carrying disc is attached to the bearing face of the heating base. The laser welding efficiency of the transparent workpiece can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding of transparent workpieces, and particularly to a laser welding jig and device for transparent workpieces. Background Art

[0002] Plastic is a kind of high molecular organic compound, with excellent properties such as light weight, high specific strength, and corrosion resistance. After nearly a century of development, plastic has become one of the important basic materials equivalent to steel, cement, and wood. Plastic plays an increasingly important role in fields such as optics, medical devices, food, aerospace, agriculture, and packaging. To meet diverse demands, more and more plastic parts cannot be produced by injection molding, and the secondary connection process has become a key technology for plastic part production.

[0003] At present, the secondary connection processes of plastic parts mainly include mechanical connection, adhesive connection, and welding. Although mechanical connection methods (such as bolts and rivets) can obtain relatively high connection strength, mechanical parts will increase the weight of plastic parts. The adhesive connection has problems such as low efficiency, low connection strength, and easy aging. The welding methods for plastic parts mainly include hot melt welding, friction welding, ultrasonic welding, and laser welding. The hot melt and ultrasonic welding of plastics are not environmentally friendly. More specifically, toxic or pungent gases will be generated during the hot melt welding process, and ultrasonic welding and friction welding will generate sharp noises and relatively large welding stresses. In addition, hot melt welding, friction welding, and ultrasonic welding are not applicable to complex or precision plastic parts. Laser welding is a plastic part welding technology that has developed rapidly in recent years, with characteristics such as high welding strength, fast welding speed, high precision, low welding stress, and strong adaptability to space curves.

[0004] In the traditional laser welding process of transparent workpieces, a laser is usually used to perform laser welding on the transparent workpieces clamped on the jig. The difficulty in laser welding of transparent workpieces lies in that the upper and lower layer surfaces cannot be damaged during the welding process. However, since both the upper and lower layers are transparent materials and will absorb light simultaneously, if the laser power is high, it is very easy to be damaged, and if the power is small, the welding efficiency will be very slow. Therefore, the current transparent welding speed is not very fast. Therefore, it is necessary to improve the existing laser welding jig and device for transparent workpieces to improve the efficiency of laser welding of transparent workpieces. Summary of the Invention

[0005] The purpose of the present invention is to provide a laser welding jig and device for transparent workpieces to solve the problem of low welding efficiency of the existing laser welding jig and device for transparent workpieces.

[0006] To solve the above technical problems, the present invention provides a laser welding jig for transparent workpieces, including a carrier table. The carrier table includes a heating base and a carrier plate for welding the transparent workpieces. A constant temperature heating device is provided inside the heating base, and the carrier plate is fitted and installed on the bearing surface of the heating base.

[0007] Optionally, the temperature controlled by the constant temperature heating device is 45 - 55 °C.

[0008] Optionally, a reflective mirror surface is provided at the welding track of the carrier plate corresponding to the transparent workpiece.

[0009] Optionally, the heating base further includes a bottom plate. The constant temperature heating device is arranged inside the bottom plate, and the bearing surface is located on the bottom plate.

[0010] Optionally, air holes are formed on the carrier plate. The heating base further includes an air duct. The air duct is formed on the bottom plate, one end of the air duct penetrates through the bearing surface, and the air holes are communicated with the air duct.

[0011] Optionally, the number of the air ducts is multiple. The constant temperature heating device includes multiple heating elements, and the multiple heating elements and the air ducts are arranged at intervals.

[0012] Optionally, the carrier table further includes a base, and the heating base can slide horizontally relative to the base.

[0013] Optionally, it further includes a pressing seat. The pressing seat can move vertically up and down relative to the base, and the base is located on the lifting path of the pressing seat.

[0014] Optionally, the pressing seat has a limiting block, and the limiting block cooperates with the base.

[0015] The present invention also provides a laser welding device for transparent workpieces, including a laser welder and the above-mentioned laser welding jig for transparent workpieces.

[0016] The present invention also provides a laser welding device for transparent workpieces, including a laser welder and the above-mentioned laser welding jig for transparent workpieces.

[0017] The laser welding jig and device for transparent workpieces provided by the present invention have the following beneficial effects:

[0018] When a transparent workpiece is placed on a carrier plate and the carrier plate is placed on a bearing surface, since a constant-temperature heating device is provided in the heating base of the carrier stage, the heating base can radiate a certain amount of infrared light to the transparent workpiece, and the infrared light can facilitate the transparent workpiece to absorb the laser, thereby accelerating the welding speed of the transparent workpiece. Since the laser power is not increased, the deformation of the transparent workpiece caused by too high laser power or the deformation caused by too high temperature can be avoided. Therefore, the welding efficiency of the transparent workpiece can be improved without causing deformation of the transparent workpiece. The welding speed can be increased from less than 10 mm / s originally to 25 - 30 mm / s now, showing a significant improvement. In addition, due to the improvement of the welding efficiency, the heat accumulation on the transparent workpiece becomes less, resulting in less deformation of the transparent workpiece. Description of the Drawings

[0019] Figure 1 FIG. 6 is a schematic structural diagram of a laser welding jig for a transparent workpiece in the first embodiment of the present invention;

[0020] Figure 2 FIG. 10 is a partial exploded schematic diagram of a laser welding jig for a transparent workpiece in the first embodiment of the present invention;

[0021] Figure 3 FIG. 14 is a schematic structural diagram of a heating element of a laser welding jig for a transparent workpiece in the first embodiment of the present invention;

[0022] Figure 4 FIG. 18 is a schematic structural diagram of a transparent workpiece of a laser welding jig for a transparent workpiece in the first embodiment of the present invention;

[0023] Figure 5 FIG. 22 is a schematic structural diagram of a laser welding device for a transparent workpiece in the second embodiment of the present invention;

[0024] Figure 6 FIG. 26 is a schematic structural diagram of a laser welder in a laser welding device for a transparent workpiece in the second embodiment of the present invention.

[0025] 100 - Laser welder; 110 - Galvo scanner; 140 - Lens assembly;

[0026] 200 - Laser welding jig for transparent workpiece; 210 - Carrier stage; 211 - Bearing surface; 212 - Base; 213 - Heating base; 214 - Bottom plate; 215 - Air channel; 220 - Carrier plate; 221 - Air hole; 230 - Pressing seat; 240 - Limit stop;

[0027] 300 - Transparent workpiece. Detailed Embodiments

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0032] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] Embodiment 1

[0035] ReferenceFigure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 is a schematic structural view of the laser welding fixture 200 for transparent workpieces in the first embodiment of the present invention. Figure 2 is a partial exploded view of the laser welding fixture 200 for transparent workpieces in the first embodiment of the present invention. Figure 3 is a schematic structural view of the heating element of the laser welding fixture 200 for transparent workpieces in the first embodiment of the present invention. Figure 4 is a schematic structural view of the transparent workpiece 300 of the laser welding fixture 200 for transparent workpieces in the first embodiment of the present invention. The present embodiment provides a laser welding fixture 200 for transparent workpieces, including a stage 210. The stage 210 includes a heating base 213 and a carrier plate 220 for welding transparent workpieces. A constant temperature heating device is provided in the heating base 213, and the carrier plate 220 is fitted and installed on the bearing surface 211 of the heating base 213.

[0036] When the transparent workpiece 300 is placed on the carrier plate 220 and the carrier plate 220 is placed on the bearing surface 211, since a constant temperature heating device is provided in the heating base 213 of the stage, the heating base 213 can radiate a certain amount of infrared light to the transparent workpiece 300, and the infrared light can facilitate the transparent workpiece to absorb the laser, thereby accelerating the welding speed of the transparent workpiece. Since the laser power is not increased, the deformation of the transparent workpiece 300 caused by too high laser power or the deformation caused by too high temperature can be avoided. Therefore, the welding efficiency of the transparent workpiece can be improved without causing deformation of the transparent workpiece 300. The welding speed can be increased from less than 10 mm / s originally to 25 - 30 mm / s now, showing a significant improvement. In addition, due to the improvement of the welding efficiency, the heat accumulation on the transparent workpiece becomes less, resulting in less deformation of the transparent workpiece.

[0037] The temperature control temperature of the constant temperature heating device is 45 - 55 °C. Through experimental tests, it is found that the effect is the best when the temperature is between 45 - 55 °C. If the temperature is too low, it cannot achieve the effect of accelerating welding. If the temperature is too high, the welding deformation amount will increase, affecting the product size.

[0038] A reflecting mirror surface is provided at the welding track of the carrier plate 220 corresponding to the transparent workpiece 300. In this way, the laser can be reflected by the reflecting mirror surface, thereby facilitating the absorption of the laser by the transparent workpiece and improving the welding efficiency of the transparent workpiece. In addition, due to the improvement of the welding efficiency, the heat accumulation on the transparent workpiece becomes less, resulting in less deformation of the transparent workpiece. Among them, the closer the transparent workpiece is to the welding area, the stronger the intensity of the reflected laser, and the easier it is to weld.

[0039] Preferably, the reflecting mirror surface is a sub-mirror smooth surface, processed by sub-mirror polishing technology.

[0040] The carrier plate 220 is provided with air holes 221, so as to fix the transparent workpiece 300 on the carrier plate 220 by adsorption during welding.

[0041] Reference Figure 2 and Figure 3 , the heating base 213 further includes a bottom plate 214, the constant temperature heating device is arranged in the bottom plate 214, and the bearing surface 211 is located on the bottom plate 214.

[0042] The heating base 213 further includes an air duct 215, the air duct 215 is opened on the bottom plate 214, one end of the air duct 215 penetrates through the bearing surface 211, and the air hole 221 is communicated with the air duct 215. By arranging the air duct 215 to adsorb the transparent workpiece 300 on the carrier plate 220, deformation of the transparent workpiece 300 during the welding process can be avoided, achieving the purpose of reducing deformation.

[0043] In this embodiment, the number of the air ducts 215 is multiple, the constant temperature heating device includes multiple heating elements, and the multiple heating elements and the air ducts 215 are arranged at intervals.

[0044] Reference Figure 3 , the number of the air ducts 215 is preferably three, the number of the heating elements is preferably two, the three air ducts 215 are arranged side by side, and the two heating elements are arranged side by side.

[0045] Preferably, the carrier 210 further includes a base 212, and the heating base 213 can slide horizontally relative to the base 212. In this way, it is convenient to load and unload the carrier plate 220.

[0046] The transparent workpiece laser welding fixture 200 further includes a pressing base 230, the pressing base 230 can lift vertically relative to the base 212, and the base 212 is located on the lifting path of the pressing base 230. By lifting the pressing base 230, the distance between the carrier 210 and the pressing base 230 can be changed. When the distance between the carrier 210 and the pressing base 230 is the smallest, the pressing base 230 presses the transparent workpiece 300 on the carrier plate 220 on the carrier 210. In this way, deformation of the transparent workpiece 300 during the welding process can be avoided.

[0047] The pressing base 230 and the base 212 are connected by a slide rail.

[0048] The pressing base 230 has a limit stop 240, and the limit stop 240 cooperates with the base 212 to prevent the distance between the pressing base 230 and the heating base 213 from being too small and damaging the transparent workpiece 300.

[0049] Embodiment Two

[0050] ReferenceFigure 5 , Figure 5 FIG. Figure 5 is a schematic structural diagram of the transparent workpiece laser welding device in the second embodiment of the present invention. The present embodiment provides a transparent workpiece laser welding device, including a laser welder 100 and the transparent workpiece laser welding jig 200 in the above embodiment.

[0051] Referring to Figure 6 , Figure 6 FIG. Figure 6 is a schematic structural diagram of the laser welder 100 in the transparent workpiece laser welding device in the second embodiment of the present invention. The laser welder 100 includes a galvanometer 110, an adjustable collimation assembly, a spot shaping assembly, and a lens assembly 140. The laser sequentially passes through the galvanometer 110, the spot shaping assembly, the adjustable collimation assembly, and the lens assembly 140. The spot shaping assembly and the adjustable collimation assembly are used to adjust the Gaussian light into a flat-top light, and the adjustable collimation assembly is also used to adjust the focal depth of the laser. By adjusting the laser spot shaping and the focal depth, the upper and lower layers of transparent workpieces can absorb the laser simultaneously, thereby realizing the welding of the transparent workpieces.

[0052] Embodiment Three

[0053] The present embodiment provides a transparent workpiece laser welding method, including:

[0054] When welding and processing a transparent workpiece with two layers of transparent materials using a laser, adjust the laser spot to a flat-top light and shorten the laser focal depth so that both layers of transparent materials absorb the laser energy.

[0055] By shaping the Gaussian light into a flat-top light and adjusting the focal depth, the upper and lower layers of transparent workpieces can absorb the laser simultaneously, thereby realizing the welding of the transparent workpieces. After shaping the Gaussian into a flat-top light, generally the welding effect is best near the focus, generally the best within a focal depth of 0 - 3 mm. When the defocus is large, the spot will become a quasi-flat-top and quasi-Gaussian beam, affecting the welding effect.

[0056] Due to the excessive energy at the focus, plastic welding is generally carried out within a certain positive defocus range. The focal depth in the infrared band can be used for welding within about 0 - 30 mm. The focal depth for transparent plastic welding is generally only about 0 - 6 mm. However, products with different thicknesses require different focal depths. Therefore, an adjustable focal depth device is made on the external optical path to better accommodate the welding of more products.

[0057] In the present embodiment, the wavelength of the laser is 1720 nm to 1940 nm.

[0058] The laser welding method for the transparent workpiece further includes: placing the transparent workpiece 300 on the carrier plate 220, and placing the carrier plate 220 on the bearing surface 211 of the stage 210; heating the stage 210 to make the temperature controlled by the constant temperature heating device be 45 - 55°C. By heating the stage 210, the absorption rate of the transparent workpiece to the laser can be effectively increased, and it overcomes the technical prejudice in the prior art that due to the heat accumulation in laser welding, the transparent workpiece 300 is deformed and urgently needs to dissipate heat from the transparent workpiece 300 instead of heating to improve the laser welding efficiency, thereby reducing the heat accumulation and reducing the deformation of the transparent workpiece 300.

[0059] The laser welding method for the transparent workpiece further includes setting the surface of the carrier plate 220 in contact with the transparent workpiece 300 corresponding to the welding track of the transparent workpiece 300 as a reflective mirror surface.

[0060] The reflective mirror surface is preferably a sub - mirror smooth surface.

[0061] The laser welding method for the transparent workpiece further includes: pressing the transparent workpiece tightly on the carrier plate when laser - welding the transparent workpiece.

[0062] The laser welding method for the transparent workpiece further includes: continuing to press the transparent workpiece tightly on the carrier plate for a predetermined time after the transparent workpiece is welded. Preferably, the predetermined time is 1 - 3 seconds. Generally, after welding is completed, the pressure is maintained for 1 - 3 seconds to allow the plastic to solidify and increase the strength. At the same time, the constant temperature heating device ensures that the product does not cool down too quickly, resulting in excessive stress and cracks.

[0063] The transparent workpiece in this application can be transparent plastic. Since the laser welding jig and device in this application can reduce the deformation of the upper - layer transparent plastic and the lower - layer transparent plastic during the welding process, the welded transparent plastic has the characteristics of high welding accuracy and no pollution, and thus can meet the requirements of high precision and high cleanliness of medical devices.

[0064] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A laser welding jig for transparent workpieces, characterized in that It includes a stage, the stage includes a heating base and a carrier plate for welding a transparent workpiece, a constant-temperature heating device is arranged in the heating base, and the carrier plate is fitted and installed on the bearing surface of the heating base.

2. The laser welding fixture for transparent workpieces according to claim 1, characterized in that, The temperature control temperature of the constant-temperature heating device is 45-55 °C.

3. The laser welding fixture for transparent workpieces according to claim 1, wherein A reflecting mirror surface is arranged at the welding track of the carrier plate corresponding to the transparent workpiece.

4. The transparent workpiece laser welding jig according to claim 1, characterized in that, The heating base further includes a bottom plate, the constant-temperature heating device is arranged in the bottom plate, and the bearing surface is located on the bottom plate.

5. The laser welding fixture for transparent workpieces according to claim 4, wherein, Air holes are formed in the carrier plate, the heating base further includes an air duct, the air duct is formed in the bottom plate, one end of the air duct penetrates through the bearing surface, and the air holes are communicated with the air duct.

6. The transparent workpiece laser welding jig according to claim 5, characterized in that The number of the air ducts is multiple, the constant-temperature heating device includes multiple heating elements, and the multiple heating elements and the air ducts are arranged at intervals.

7. The laser welding fixture for transparent workpieces according to claim 1, characterized in that, The stage further includes a base, and the heating base can slide horizontally relative to the base.

8. The laser welding fixture for transparent workpieces according to claim 7, characterized in that, It further includes a pressing base, the pressing base can move vertically up and down relative to the base, and the base is located on the lifting path of the pressing base.

9. The laser welding jig for transparent workpieces according to claim 8, wherein, The pressing base is provided with a limiting stop block, and the limiting stop block cooperates with the base.

10. A laser welding device for transparent workpieces, characterized in that, It includes a laser welder and a laser welding jig for transparent workpieces according to any one of claims 1 to 9.

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