CN108907465A - A kind of Blow off module and welding system for laser flying weldering - Google Patents

Abstract

The invention provides an air blowing module for laser flying welding, which includes a flat air blowing nozzle, the flat air blowing nozzle is a whistle-shaped structure, and two ends along its length direction are respectively provided with an air outlet and an air inlet. The air outlet is extended along the width direction of the flat blowing nozzle, and the air inlet is composed of several small holes of the same aperture arranged side by side, and is evenly arranged along the width direction of the flat blowing nozzle. In addition, the invention also provides a welding system for laser flying welding comprising the blowing module. The invention has a simple structure. Through the convection design of the air inlet and the air outlet, multiple air inlets are used to control the convection of the gas inside the flat blowing nozzle, which ensures that the air flow of the blowing module is uniform, so that it can be formed on the surface of the weld. Plasma negative pressure blows zinc vapor away, which effectively solves the problem of holes formed during laser flight welding of galvanized sheets.

Description

A blowing module and welding system for laser flight welding

technical field

The invention belongs to the technical field of laser welding, and in particular relates to an air blowing module and a welding system for laser flying welding.

Background technique

The manufacturing of the automobile industry has entered an automatic, efficient and high-quality stage. Compared with ordinary welding processes, laser welding has significant advantages such as concentrated heat source energy, fast welding speed, small thermal deformation, and less spatter. Half of the auto parts in Europe and the United States Or the entire vehicle manufacturing process uses laser welding; in high-power laser welding, flying laser welding is favored for its solution to the connection of high-density welds. And it is more and more widely used in the welding manufacturing of automobiles. Compared with spot welding, it can significantly improve the welding cycle.

In order to increase the corrosion resistance of the car body panels, galvanized panels are used for most of the car panels, and the corrosion resistance of the materials can be greatly improved by hot-dip galvanizing or electro-galvanizing processes. However, the coating is a very big obstacle for laser welding. The instantaneous temperature of the laser is high, which acts on the surface of the galvanized automobile sheet, and the galvanized layer is vaporized instantly. It is easy to form a large internal pressure in the space, and if it cannot be discharged in an instant, it will cause pores or spatter in the welding.

However, in order to overcome the above-mentioned defects in laser welding of galvanized sheets, before adopting flying welding, stamping dies are used to stamp bosses at each section of welding seam, with a height between 0.1 and 0.2mm, and they are pressed by clamps to ensure that There is a gap of about 0.2mm between the parts when welding, so as to ensure that the zinc vapor can be discharged in time when the galvanized sheet is welded. However, there is a problem with this processing method. The previous process needs to be processed, and after a long time, the mold wears out, which will affect the height of the boss, thereby affecting the final welding effect. In addition, there are also manufacturers who directly use the laser bossing process. By controlling the laser parameters, the laser is directly used to act on the lower plate of the stitch welding before welding, and the lower plate forms a boss of about 0.2mm through thermal expansion. Consider the wear problem of the front mold, but it will bring the loss of beat.

Patent 201610030837.X provides a method to solve the internal holes of the weld, but the key structure blowing module has no clear structural design, and no specific solution is made for the specific structure of the weld product.

Contents of the invention

The purpose of the present invention is to overcome the problems that the existing laser flying welding welding galvanized sheet is complicated to discharge zinc vapor and affects the welding effect.

For this reason, the present invention provides a kind of blowing module that is used for laser flight welding, comprises flat blowing nozzle, and described flat blowing nozzle is whistle-shaped structure, and the two ends along its length direction are respectively provided with air outlet and air inlet , the air outlet is extended along the width direction of the flat blowing nozzle, and the air inlet is composed of several small holes of the same aperture arranged side by side, and is evenly arranged along the width direction of the flat blowing nozzle.

Further, the flat blowing nozzle is made of red copper.

Further, the flat blowing nozzle is an internal hollow chamber structure integrally formed by a semi-circular arc segment and an extension segment with a tapered diameter, the air inlet is located in the semi-circular arc segment, and the air outlet is located in the extension segment end, and the air inlet and the air outlet are located at different levels.

Further, a filter for filtering oil and water in the air intake is provided on the side of the air intake in the flat blowing nozzle.

In addition, the present invention also provides a welding system for laser flying welding, including a welding protection room, a movement mechanism, a laser welding head, a pressing mechanism and the above-mentioned blowing module, the movement mechanism, the laser welding head, the pressing Both the tightening mechanism and the blowing module are arranged in the welding protection room, the laser welding head is fixedly connected to the moving mechanism, and the laser welding head is located on the pressing mechanism, and the blowing module is fixed on the pressing mechanism. mechanism, and the air outlet of the blowing module is arranged parallel to the welding seam of the workpiece fixed on the pressing mechanism.

Further, there are multiple air blowing modules, each air blowing module corresponds to a segment of the weld seam of the workpiece, and the length of the air outlet of each air blowing module is 10 mm longer than the length of the corresponding weld seam.

Further, the pressing mechanism includes two relatively parallel clamping blocks for pressing the workpiece, and a connection module for adjusting the vertical position of the clamping blocks, and the blowing module is fixedly connected to the two clamping blocks. Between the clamping blocks, the connecting module is connected to the blowing module.

Further, the vertical distance between the air outlet of the air blowing module and the workpiece weld is 1-3mm, and the horizontal distance between the air outlet and the weld is 3-6mm, and the blowing pressure of the air outlet of the air blowing module is 4-6bar .

Further, the air outlet of the blowing module is connected with a solenoid valve for controlling the gas flow, and the solenoid valve is interlocked with the laser welding head for control.

The above-mentioned welding system for laser flight welding also includes a dust removal device arranged outside the welding protection room, the welding protection room and the dust removal device are connected through an exhaust pipe, and the welding protection room is provided with shutters.

Compared with prior art, the beneficial effect of the present invention:

(1) The blowing module for laser flying welding provided by the present invention has a simple structure, through the convection design of the air inlet and the air outlet, and at the same time, the air inlet adopts multiple small holes to control the convection of the gas inside the flat blowing nozzle , to ensure the uniform air flow of the blowing module, so that the plasma negative pressure can be formed on the surface of the weld to blow away the zinc vapor, which effectively solves the problem of holes formed during laser flight welding of galvanized sheets.

(2) The welding system for laser flying welding provided by the present invention uses the air blowing module to perform simultaneous air blowing on the weld seam during the laser welding process, which can not only effectively ensure the welding quality, but also directly perform laser welding on the galvanized sheet, It saves the time and cost of the process before and after laser flying welding, improves the production efficiency and reduces the production cost.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of blowing module among the present invention;

Fig. 2 is the front view of blowing module among the present invention;

Fig. 3 is the right side view of blowing module among the present invention;

Fig. 4 is the structural representation of the welding system that the present invention is used for laser flight welding;

Fig. 5 is a schematic diagram of the installation structure of the pressing mechanism and the blowing module in the present invention.

Explanation of Reference Signs: 1. Flat blowing nozzle; 2. Air outlet; 3. Air inlet; 4. Welding protection room; 5. Movement mechanism; 6. Laser welding head; 7. Welding station; 8. Blind; 9 1. Exhaust duct; 10. Dust removal device; 11. Clamping block; 12. Blowing module; 13. Connection module; 14. Welding seam.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

As shown in Fig. 1, Fig. 2 and Fig. 3, the present embodiment provides a kind of blowing module that is used for laser flight welding, comprises flat blowing nozzle 1, and described flat blowing nozzle 1 is whistle-shaped structure, namely consists of semicircle The arc section and the extended section with tapered diameter are integrally formed with an internal hollow chamber structure; and the two ends along the length direction of the flat blowing nozzle 1 are respectively provided with an air outlet 2 and an air inlet 3, and the air outlet 2 is arranged on At the end of the extension section of the flat blowing nozzle 1, the air outlet 2 is extended along the width direction of the flat blowing nozzle 1, and the air inlet 3 is arranged in the middle of the semicircle section of the flat blowing nozzle 1. The air inlet 3 is composed of several small holes of the same aperture arranged side by side, and is evenly arranged along the width direction of the flat blowing nozzle 1. The air blowing module enters air under a certain pressure through the air inlet 3. The inlet pressure of each small hole is equal, and at the same time, combined with the design that the chamber space at the inlet end is large and the chamber space at the outlet end gradually decreases, it can ensure sufficient air outlet pressure without changing the inlet pressure; optimized, The axis of the air outlet 2 and the axis of the air inlet 3 are located on different horizontal planes, so that the gas blown in from the air inlet 3 will not be blown directly from the air outlet 2, but part of the gas will pass through the inner wall of the flat blowing nozzle 1 Slow down and change direction, so that the blown gas can be further buffered inside the flat blowing nozzle 1 . In the blowing module of this embodiment, the gas enters the flat blowing nozzle 1 from the air inlet 3 and is discharged from the air outlet 2 on the side opposite to the air inlet 3 during the blowing process of the weld seam. The air inlet 3 and the air outlet 2 The convection design ensures the uniformity of the air in and out of the flat blowing nozzle 1. At the same time, combined with the whistle-shaped structure of the flat blowing nozzle 1, the gas enters the semicircle section inside the flat blowing nozzle 1 for buffering, and the air inlet 3 adopts multiple The small hole controls the convection of the gas inside the flat blowing nozzle 1, which further ensures the uniformity of the gas flow at the gas outlet 2 of the blowing module, so that the plasma negative pressure is formed on the surface of the weld seam and the gas produced during the welding process of the galvanized sheet The zinc vapor is blown away, which effectively solves the problem of holes formed in the process of laser flying welding welding galvanized sheets.

Wherein, the flat air blowing nozzle 1 is made of red copper, which can prevent weld spatter from adhering to the air blowing module during the welding process, increase the service life of the air blowing module, and at the same time ensure its rigidity. The opening width of the air outlet 2 is 1mm, and the aperture diameter of the air inlet 3 is 2mm, and the opening width of the air inlet 3 is designed to be greater than the opening width of the air outlet 2, which is conducive to ensuring the air flow of the air outlet 2. flow rate and air outlet pressure; and in order to ensure the quality of the gas discharged from the air outlet 2, the side of the air inlet 3 in the flat blowing nozzle 1 is provided with a filter for filtering the oil and water in the intake air, and the filter ensures that the intake air is degreased Remove the water to ensure the cleanliness of the air blowing, avoid the influence of the air blowing on the quality of the weld, and improve the use effect and life of the air blowing module.

In addition, as shown in Figures 4 and 5, the present invention also provides a welding system for laser flying welding, including a welding protection room 4, a moving mechanism 5, a laser welding head 6, a pressing mechanism and the above-mentioned blowing Module 12, the moving mechanism 5, the laser welding head 6, the pressing mechanism and the blowing module 12 are all arranged in the welding protection room 4, the laser welding head 6 is fixedly connected to the moving mechanism 5, and the laser welding The head 6 is located on the pressing mechanism, the blowing module 12 is fixed on the pressing mechanism, and the air outlet 2 of the blowing module 12 faces the welding seam 14 of the workpiece fixed on the pressing mechanism Arranged in parallel. When performing laser flight welding on the workpiece (galvanized sheet car door), the workpiece is pressed on the welding station 7 in the welding protection room 4 by the pressing mechanism to ensure that there is no gap between the inner panel of the door and the window frame. At this time, the air blowing module 12 connected to the pressing mechanism corresponds to 1-3mm above the weld seam 14, and the distance from the weld seam 14 in the horizontal direction is 3-6mm. At the same time, the position of the laser welding head 6 is adjusted through the movement mechanism 5, Focus the light output from the laser welding head 6 to the weld seam 14. When the laser welding head 6 is turned on, the air blowing module 12 blows air to the surface of the weld seam 14, and the air blowing pressure at the air outlet 2 reaches 4-6 bar. The plasma negative pressure is formed on the surface of the seam 14 to blow away the steam in the keyhole, so as to ensure that the gas escapes during the welding process and avoids the formation of holes. The welding system of this embodiment uses the air blowing module 12 to perform simultaneous air blowing on the weld seam 14 during the laser welding process, which can not only effectively ensure the welding quality, but also directly perform laser welding on the galvanized sheet, saving the process flow before and after laser flying welding The time and cost are reduced, the production efficiency is improved, and the production cost is reduced.

Specifically, as shown in FIG. 5, the pressing mechanism includes two relatively parallel clamping blocks 11 for pressing the workpiece, and a connection module 13 for adjusting the vertical position of the clamping blocks 11. The blowing module 12 and the two clamping blocks 11 are mechanically fixed to ensure the rigidity of the connection. The connecting module 13 is connected to the blowing module 12, and the clamping block 11 is adjusted through the connecting module 13. Lifting, so as to control the compression degree of the clamping block 11 to the workpiece, ensure zero clearance of the workpiece, easy to operate, and effectively improve the welding quality of the weld seam.

Optimally, the air blowing module 12 is provided with multiple, each air blowing module 12 corresponds to a section of weld seam 14 of the workpiece, so as to precisely control the air blowing pressure at the weld seam 14, and the outlet of each air blow module 12 The length of the gas port 2 is 10mm longer than the length of the corresponding weld seam 14, so as to ensure that the weld seam size of the workpiece in production can be completely covered within the deviation blowing range, and improve the blowing protection effect on the weld seam 14. In laser flying welding, the time of each weld is controlled to be 0.2-0.6s, and the transition time between two adjacent welds can be ignored. On the premise of not changing the blowing pressure, in order to ensure the effect of blowing, the welding Start blowing at 0-0.15s before welding, and turn off the blowing at a delay of 0-0.15s after welding; due to the short time of a single welding spot in laser flying welding, considering the accuracy of blowing pressure control, further, you can The gas outlet 2 of the blowing module 12 is connected with a solenoid valve for controlling the flow of gas, and the solenoid valve is interlocked with the laser welding head 6 for interlocking control. In order to ensure that each time the laser welding is performed, only the gas outlet 2 at the welding place blows. Gas, each section of weld 14 needs to be numbered and corresponding to the solenoid valve. When the laser welding head 6 starts welding, the solenoid valve is opened to ensure the blowing pressure and blowing effect of a single weld 14; If the air module 12 does not blow air in advance or the electromagnetic valve fails, an alarm device can also be provided to ensure that the quality of the entire laser flight welding seam is controllable.

In addition, in order to avoid the impact of welding spatter and smoke generated during laser flying welding on the quality of the weld, the welding system also includes a dust removal device 10, which is arranged outside the welding protection room 4, and the welding protection room 4 It is connected with the dust removal device 10 through an exhaust duct 9, which is set corresponding to the welding station 7, and the smoke and dust are discharged into the dust removal device 10 through the exhaust duct 9. At the same time, the welding protection room 4 is provided with louvers 8 to improve welding. operating environment.

The above examples are only illustrations of the present invention, and do not constitute a limitation to the protection scope of the present invention. All designs that are the same as or similar to the present invention fall within the protection scope of the present invention.

Claims (10)

1. a kind of Blow off module for laser flying weldering, it is characterised in that：Including flat blowing nozzle, the flat blowing nozzle is whistle Shape structure, both ends along its length are respectively equipped with gas outlet and air inlet, and the gas outlet is the width along flat blowing nozzle Direction is extended, and the air inlet is the aperture composition of several same apertures side by side, and along the width side of flat blowing nozzle To being evenly arranged.

2. the Blow off module for laser flying weldering as described in claim 1, it is characterised in that：The flat blowing nozzle is using purple Copper material.

3. the Blow off module for laser flying weldering as described in claim 1, it is characterised in that：The flat blowing nozzle is by half The chamber structure of arc section and the tapered integrally formed inner hollow in extended segment of bore, the air inlet are located at semicircle segmental arc, The gas outlet is located at the end of extended segment, and the air inlet and gas outlet are located at different level.

4. the Blow off module for laser flying weldering as described in claim 1, it is characterised in that：In the flat blowing nozzle into Port side is provided with the filter for filtering grease in air inlet.

5. a kind of welding system for laser flying weldering, it is characterised in that：Room, movement mechanism, Laser Welding are protected including welding Connector, hold-down mechanism and the described in any item Blow off module of Claims 1 to 4, the movement mechanism, laser welding head, pressure Tight mechanism and Blow off module are arranged in welding protection room, and the laser welding head is fixedly connected on the movement mechanism, And laser welding head is located at the upper of hold-down mechanism, the Blow off module is fixed on the hold-down mechanism, and the Blow off module Gas outlet towards be fixed on workpiece on the hold-down mechanism weld seam be arranged in parallel.

6. the welding system for laser flying weldering as claimed in claim 5, it is characterised in that：The Blow off module is provided with Multiple, each Blow off module corresponds to one section of weld seam of workpiece, and the gas outlet length of each Blow off module is than corresponding weldering Stitch the long 10mm of length.

7. the welding system for laser flying weldering as claimed in claim 5, it is characterised in that：The hold-down mechanism includes using In two clamping briquettings being arranged in parallel of workpiece pressing, and adjust the link block for clamping briquetting vertical position, institute It states Blow off module to be fixedly connected between two clamping briquettings, the link block is connected to the upper of the Blow off module.

8. the welding system for laser flying weldering as claimed in claim 5, it is characterised in that：The outlet of the Blow off module The vertical spacing of mouth and workpiece weld seam is 1~3mm, and is 3~6mm, the gas outlet of the Blow off module with weld seam horizontal space Blow gas pressure is 4~6bar.

9. the welding system for laser flying weldering as claimed in claim 5, it is characterised in that：The outlet of the Blow off module The solenoid valve for controlling gas flow, the solenoid valve and the laser welding head interlocked control are connected on mouth.

10. the welding system for laser flying weldering as claimed in claim 5, it is characterised in that：It further include that setting is being welded The dust-extraction unit outside room is protected, is connected between the welding protection room and dust-extraction unit by air draft pipe, the welding is anti- It protects room and is equipped with shutter.