Laser welding device

Abstract

A laser welding device, comprising a cover plate and an air guide block covering a workpiece to be welded, the workpiece being provided with a welding pad, the cover plate being provided with a spot welding bottom hole exposing the surface of the welding pad, the inner diameter of the upper side of the spot welding bottom hole being larger than the inner diameter of the lower side so that the inner wall surface of the spot welding bottom hole is an inclined surface, the air guide block comprising an air inlet hole, a welding hole corresponding to the spot welding bottom hole and an air groove connecting the air inlet hole to the outer periphery of the bottom of the welding hole, an outer air gap being formed on the inner wall surface of the upper side of the spot welding bottom hole, inert gas is injected from the air guide block through the outer air gap, downwardly enters the surface of the welding pad along the inner wall surface of the spot welding bottom hole and is discharged through the middle of the spot welding bottom hole and the welding hole. The laser welding of the present application has good quality and low cost.

Description

Technical Field

[0001] The invention relates to the field of metal processing, in particular to a laser welding device. Background Art

[0002] In laser welding production applications, in order to obtain good welding results, inert gas is generally used to protect the welding points. Currently, there are two common ways to blow protective gas: one is to add a clamping gas pipe mechanism outside the welding mechanism for blowing, but the effect is poor and it needs to be blown all the time, wasting gas; there is also a gas shield type mechanism that can meet the welding effect, but it is necessary to frequently replace expensive lenses (the lens cost is about 1000RMB), and the gas must be constantly filled into the shield, which has a high gas cost. Summary of the invention

[0003] Based on this, the present invention provides a laser welding device, which forms an outer air gap through the upper inner wall surface of the welding hole of the cover plate, so that the inert gas rushes downward along the inner wall surface of the welding hole along the outer air gap and then is discharged upward along the middle of the spot welding bottom hole to take away the smoke, etc., thereby ensuring the welding quality and reducing the processing cost.

[0004] In order to solve the above technical problems, the present application provides a laser welding device, including a cover plate and an air guide block covering a workpiece to be welded, the workpiece is provided with a welding pad, and the cover plate is provided with a spot welding bottom hole that exposes the surface of the welding pad, the inner diameter of the upper side of the spot welding bottom hole is larger than the inner diameter of the lower side so that the inner wall surface of the spot welding bottom hole is an inclined surface, the air guide block includes an air inlet hole, a welding hole corresponding to the spot welding bottom hole, and an air groove connecting the air inlet hole to the outer periphery of the bottom of the welding hole, an outer air gap is formed on the inner wall surface of the upper side of the spot welding bottom hole, and the inert gas is injected from the air guide block through the outer air gap along the inner wall surface of the spot welding bottom hole downward into the surface of the welding pad and is discharged through the spot welding bottom hole and the middle of the welding hole.

[0005] Preferably, the welding hole includes an upper welding hole and a lower welding hole, the inner diameter of the upper welding hole is larger than the inner diameter of the lower welding hole, the lower welding hole protrudes downward and partially enters the spot welding bottom hole, and the outer air gap is formed between the inner wall surface on the upper side of the spot welding bottom hole and the outer peripheral surface of the lower welding hole.

[0006] Preferably, a plurality of air inlet holes are provided on both longitudinal sides of the air guide block, each welding hole is located between a pair of air inlet holes, and the air inlet holes are connected to the outer air gap through an air groove provided at the joint surface of the air guide block and the cover plate.

[0007] Preferably, a slot is provided on the upper surface of the cover plate, the spot welding bottom hole is formed by penetrating the bottom wall of the slot, the air guide block is embedded in the slot, and the laser welding device also includes an air guide plate, which covers the air guide block and the upper surface of the cover plate.

[0008] Preferably, the upper surface of the air guide plate is provided with a plurality of air nozzles, and the bottom of the air guide plate is provided with a plurality of air grooves connecting the air nozzles and the air inlet holes; the air guide plate is provided with through holes corresponding to the welding holes and the spot welding holes.

[0009] Preferably, the laser welding device also includes an air guide plate located between the cover plate and the air guide block, the air guide block is provided with a through hole passing through the upper and lower parts corresponding to the position of the spot welding bottom hole, the through hole includes an open portion in a trumpet shape on the upper side and a vertical opening portion located under the open portion, the vertical opening portion protrudes downward to form a protruding portion, the protruding portion enters the upper side of the spot welding bottom hole and forms the outer air gap between the inner side surface of the spot welding bottom hole and the outer side surface of the protruding portion.

[0010] Preferably, the welding hole includes an upper welding hole and a lower welding hole, the inner diameter of the upper welding hole is larger than the inner diameter of the lower welding hole, the lower welding hole protrudes downward and partially enters the open part of the spot welding bottom hole, the bottom of the lower welding hole is abutted against the inclined inner wall surface of the open part and forms an air ring between the lower welding hole and the inclined inner wall surface of the open part.

[0011] Preferably, the welding hole is further provided with a plurality of micro pores penetrating downward from the inclined inner wall surface of the open portion to the outer peripheral surface of the lower welding hole, and the micro pores connect the air ring and the outer air gap.

[0012] Preferably, the air groove of the air guide block is connected to the air ring, and the inert gas enters the outer air gap from the air inlet hole, the air ring and a plurality of micro air holes of the air guide block, and rushes downward from the outer air gap along the inclined inner wall surface of the spot welding bottom hole into the welding pad of the workpiece.

[0013] Preferably, the inert gas fills the pad under the spot welding bottom hole and is discharged upward along the spot welding bottom hole, the through hole and the welding hole, and the welding hole, the through hole and the spot welding bottom hole constitute the laser beam hole.

[0014] The laser welding device of the present application is provided with a spot welding bottom hole on the cover plate to expose the welding pad of the workpiece, and then a gas guide block is provided to allow the inert gas flow to enter downward along the inner wall surface of the spot welding bottom hole, so that the inert gas flow enters from the edge of the spot welding bottom hole and then is discharged from the middle along the laser beam hole and takes out smoke, etc., so that the laser beam hole has good permeability to maintain the penetration of the laser beam, maintain good welding quality, and reduce the use of inert gas. At the same time, there is no need to use gas protection lenses, which reduces processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional image of the workpiece to be welded for this application;

[0016] Figure 2 A three-dimensional diagram of the laser welding device of this application;

[0017] Figure 3 This is a three-dimensional exploded view of the laser welding device of this application;

[0018] Figure 4 This is a three-dimensional exploded view of the laser welding device of the present application from another angle;

[0019] Figure 5 For along Figure 2 The cross-sectional view along the dashed line AA and its partial enlarged view shown;

[0020] Figure 6 For along Figure 2 The cross-sectional view along the dotted line BB and its partial enlarged view are shown.

[0021] Figure ID:

[0022] Workpiece-10; outer frame-11; wing plate-12; welding sheet-13; middle part-131; wing part-132; end part-133; disc-134; first nut-14; second nut-15; welding point-16; inner frame-17; air guide plate-20; plate body-21; first through hole-22; second through hole-23; open part-231; vertical part-232; micro air hole-233; protruding end-2 34; air nozzle-24; air groove-25; cover plate-30; cover plate body-31; notch-32; spot welding bottom hole-33; spot welding groove-331; opening slope-332; outer air gap-333; notch bottom wall-35; first air guide block-40; air inlet hole-41, 51; air groove-42; welding hole-43, 52; upper welding hole-431, 521; lower welding hole-432, 522; second air guide block-50. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] This application is Figure 1 As shown, the workpiece 10 to be laser welded in this application is a built-in elastic mechanism of a pen keyboard touchpad, including an outer frame 11, an inner frame 17, a wing plate 12, first and second nuts 14, 15, and a welding sheet 13 that is spot welded to connect the outer frame 11, the inner frame 17, the wing plate 12, and the first and second nuts 14, 15 into a whole. The welding sheet 13 includes a middle portion 131 corresponding to the inner frame 17 and the first nut 14, two wing portions 132 covering the wing plate 12 along both sides in the lateral direction, end portions 133 extending from the two wing portions 132 to both sides in the lateral direction to the outer frame 11, and a disc 134 extending from the opposite side of the two wing portions 132 in the lateral direction to form a plurality of the second nuts 15. The welding sheet 13 is an integral structure, and a plurality of welding points 16 are arranged on the welding sheet 13 and the outer frame 11, the inner frame 17, the wing plate 12, and the first and second nuts 14, 15. The number of the welding points 16 is more than one hundred at most.

[0027] In specific implementation, the laser welding device of the present application is not only applicable to the welding of the above-mentioned workpiece 10, but also applicable to the laser welding of workpieces of various shapes. That is, the structural features of the workpiece 10 in the embodiment do not limit the protection scope of the laser welding device of the present application.

[0028] Please continue reading Figures 2 to 6 As shown, the laser welding device of the present application includes a cover plate 30 , an air guide plate 20 and a plurality of air guide blocks 40 , 50 .

[0029] The cover plate 30 covers the workpiece 10 and cooperates with a base (not shown) to seal the workpiece 10. The cover plate 30 includes a cover plate body 31, a notch 32 formed on the upper surface of the cover plate body 31, and a plurality of spot welding bottom holes 33 penetrating the cover plate body 31 or penetrating the bottom wall 35 of the notch.

[0030] The gas guide block includes a first gas guide block 40 and a second gas guide block 50, and the second gas guide block 50 is embedded downward in the notch 32 of the cover plate 30. The second gas guide block 50 includes a plurality of pairs of gas inlet holes 51 that penetrate vertically on both sides, a welding hole 52 formed between a pair of the gas inlet holes 51, and a gas groove 53 that conducts gas to the periphery of the welding hole 52. The welding hole 52 corresponds to the spot welding bottom hole 33, and the welding points 16 of the workpiece 10 are arranged on the periphery of the bottom surface of the spot welding bottom hole 33.

[0031] The air guide plate 20 covers the cover plate 30, and includes a plate body 21, a first through hole 22 that penetrates the plate body 21 vertically and exposes the upper side of the welding hole 52, and a second through hole 23 that penetrates the plate body 21 vertically and directly exposes the upper side of the spot welding bottom hole 33. A plurality of air grooves 25 are also provided on the bottom surface of the plate body, and a plurality of air nozzles 24 that guide airflow into the air grooves 25 are also provided on the top of the plate body 21.

[0032] The first air guide block 40 is assembled into the second through hole 23 , and the first air guide block 40 includes an air inlet hole 41 , a welding hole 43 , and an air groove 42 connecting the air inlet hole 41 to the outer periphery of the welding hole 43 .

[0033] In the first embodiment, if Figure 5 As shown, the second through hole 23 of the air guide plate 20 includes an open portion 231 in a trumpet shape at the upper portion and a vertical opening portion 232 located at the lower side of the open portion 231. The vertical opening portion 232 protrudes downward from the bottom surface of the air guide plate 20 to form a protruding end 234. The spot welding bottom hole 33 is in the shape of a cone hole, and the inner diameter of the upper portion is larger than the inner diameter of the lower portion. The inner wall surface 332 of the spot welding bottom hole 33 is provided with a plurality of spot welding grooves 331 in the vertical direction on the side close to the workpiece 10, and each spot welding groove 331 corresponds to a welding point 16.

[0034] The protrusion 234 of the second through hole 23 of the air guide plate 20 is inserted into the spot welding bottom hole 33, and an outer air gap 333 is formed between the outer periphery of the protrusion 234 and the inner wall surface 332 on the upper side of the spot welding bottom hole 33. A plurality of micro pores 233 connected to the outer periphery of the protrusion 234 are formed on the inclined wall surface of the open portion 234 of the second through hole 23, and the micro pores 233 are connected to the air groove 42 to the outer air gap 333.

[0035] The welding hole 43 of the first air guide block 40 includes an upper welding hole 431 and a lower welding hole 432. The inner diameter of the upper welding hole 431 to the lower welding hole 432 gradually decreases, and the lower welding hole 432 is formed by protruding downward from the bottom surface of the first air guide block 40. The lower welding hole 432 enters downward into the open portion 231 of the second through hole 23 of the air guide plate 20, and the outer periphery of the bottom of the lower welding hole 432 abuts against the inclined wall surface of the open portion 231, thereby forming an air ring 433 between the inner wall surface of the open portion 231 and the outer periphery of the lower welding hole 432, and the top opening of the micro air hole 233 is located in the air ring 433.

[0036] When the workpiece 10 is spot welded in the first embodiment, an inert gas is injected through the air inlet 41 for 1 second in advance to fill the entire air path with the inert gas; then, the laser welding device covers the workpiece 10 and starts spot welding; during spot welding, the laser beam passes through the welding hole 43, the second through hole 23 and the spot welding bottom hole 33 to accurately reach the welding spot 16 for welding, and at the same time, the inert gas enters the air ring 433 along the air groove 42, and then the inert gas enters the outer air gap 333 through the micro pores 233 in the air ring 433, and the inert gas in the outer air gap 33 fills the welding spot 16 downward along the inclined inner wall surface of the spot welding bottom hole 33, and finally the inert gas is discharged upward from the spot welding bottom hole 33, the second through hole 23 and the welding hole 43 under pressure; after the welding is completed, the inert gas is stopped from being injected. During the inert gas discharge process, the inert gas also takes away the smoke and ionization cloud generated by laser welding, so that the laser beam hole composed of the spot welding bottom hole 33, the second through hole 23 and the spot welding hole 43 maintains a high penetration, and will not cause welding quality problems due to the influence of smoke on the penetration of the laser beam. At the same time, the inert gas protects the welding point 16 and the inert gas can be used in a controllable manner without causing waste of the inert gas.

[0037] In the second embodiment, if Figure 6 As shown, the spot welding bottom hole 33 is formed by penetrating the bottom wall 32 of the notch, and the spot welding bottom hole 33 is also a tapered hole, and the inner diameter of the upper side is larger than the inner diameter of the lower side. The welding hole 52 of the second air guide block 50 includes an upper welding hole 521 on the upper side and a lower welding hole 522 located on the lower side, the inner wall surface of the upper welding hole 521 is an inclined surface, and the lower welding hole 522 is formed by protruding downward from the bottom surface of the second air guide block 50, and the lower welding hole 522 enters the spot welding bottom hole 33 and forms an outer air gap 333 between the outer periphery of the lower welding hole 522 and the inner wall surface of the spot welding bottom hole 33. The first through hole 22 of the air guide plate 20 is located above the welding hole 52. The inert gas enters the gas groove 25 from the gas nozzle 24 on the gas guide plate 20, and the gas groove 25 is connected to the gas inlet hole 51 of the first gas guide block 51, and the bottom of the gas inlet hole 51 enters the outer air gap 333 through the gas groove 53 provided at the bottom of the first gas guide block 50. The lower welding hole 522 is not necessarily a closed loop structure, but can also be a sheet structure (such as Figure 4 shown).

[0038] In the actual laser welding process of this embodiment, the inert gas is first injected into the gas nozzle 24 for 1 second in advance, and the inert gas will first fill the gas grooves 25, 53, the air inlet hole 51 and the outer air gap 333; then the laser welding device covers the workpiece 10, and the inert gas continues to be injected and the air on the workpiece 10 is driven out, and the laser beam is irradiated onto the welding point 16 through the first through hole 22, the welding hole 52 and the spot welding bottom hole 33 for welding; and in this process, the inert gas is continuously injected, and after being blocked on the surface of the workpiece 10, it is discharged from the middle along the spot welding bottom hole 33, the welding hole 52 and the first through hole 22, and the smoke and ionization cloud are discharged together; and the spot welding bottom hole 33, the welding hole 52 and the first through hole 22 constitute a laser beam hole for the laser beam to enter the welding point 16.

[0039] Embodiment 1 is mainly applicable to circular pads, while embodiment 2 is applicable to square pads. However, no matter which pad structure, the principle of the laser welding device of the present application can be applied for welding, that is, by injecting inert gas into the periphery of the pad, and the inert gas is finally discharged from the laser beam hole, thereby taking away welding smoke, ionization cloud, etc. to avoid affecting the penetration of the laser beam; at the same time, the injection of inert gas can be controlled at any time to avoid waste.

[0040] Therefore, the first and second air guide blocks 40, 50 in the laser welding device of the present application are used in different embodiments. In one embodiment, only one air guide block is required, which can be collectively referred to as air guide blocks.

[0041] The laser welding device of the present application is provided with a spot welding bottom hole 33 on the cover plate 30 to expose the welding pad of the workpiece 10, and then provided with air guide blocks 40, 50 that can allow the inert gas flow to enter downward along the inner wall surface of the spot welding bottom hole, so that the inert gas flow enters from the edge of the spot welding bottom hole 33 and then is discharged from the middle along the laser beam hole and takes out smoke, etc., so that the laser beam hole has good permeability to maintain the penetration of the laser beam, maintain good welding quality, and reduce the use of inert gas. At the same time, there is no need to use gas protection lenses, which reduces processing costs.

[0042] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A laser welding device, comprising a cover plate and a gas guide block covering a workpiece to be welded, wherein the gas guide block comprises a first gas guide block and a second gas guide block, a welding pad is provided on the workpiece, and a spot welding bottom hole is provided on the cover plate to expose the surface of the welding pad, characterized in that: The inner diameter of the upper side of the spot welding bottom hole is larger than the inner diameter of the lower side so that the inner wall surface of the spot welding bottom hole is an inclined surface, the second air guide block includes an air inlet hole, a welding hole corresponding to the spot welding bottom hole and an air groove connecting the air inlet hole to the outer periphery of the bottom of the welding hole, an outer air gap is formed on the inner wall surface of the upper side of the spot welding bottom hole, and the inert gas is injected from the second air guide block through the outer air gap and enters the surface of the welding pad downward along the inner wall surface of the spot welding bottom hole and is discharged through the middle of the spot welding bottom hole and the welding hole, and the first air guide block is formed with a through hole passing through the upper and lower parts corresponding to the position of the spot welding bottom hole, the through hole includes an open portion with a trumpet shape on the upper side and a vertical opening portion located under the open portion, the vertical opening portion protrudes downward to form a protruding portion, the protruding portion enters the upper side of the spot welding bottom hole and forms the outer air gap between the inner side surface of the spot welding bottom hole and the outer side surface of the protruding portion.

2. The laser welding device according to claim 1, characterized in that: The welding hole includes an upper welding hole and a lower welding hole, the inner diameter of the upper welding hole is larger than the inner diameter of the lower welding hole, the lower welding hole protrudes downward and partially enters the spot welding bottom hole, and the outer air gap is formed between the inner wall surface on the upper side of the spot welding bottom hole and the outer peripheral surface of the lower welding hole.

3. The laser welding device according to claim 2, characterized in that: A plurality of air inlet holes are provided on both longitudinal sides of the second air guide block, each welding hole is located between a pair of air inlet holes, and the air inlet holes are connected to the outer air gap through an air groove provided at the joint surface of the second air guide block and the cover plate.

4. The laser welding device according to claim 3, characterized in that: The upper surface of the cover plate is provided with a slot, the spot welding bottom hole is formed by penetrating the bottom wall of the slot, the second air guide block is embedded in the slot, and the laser welding device also includes an air guide plate, which covers the second air guide block and the upper surface of the cover plate.

5. The laser welding device according to claim 4, characterized in that: The upper surface of the air guide plate is provided with a plurality of air nozzles, and the bottom of the air guide plate is provided with a plurality of air grooves connecting the air nozzles and the air inlet holes; the air guide plate is provided with through holes corresponding to the welding holes and the spot welding holes.

6. The laser welding device according to claim 1, characterized in that: The laser welding device further comprises an air guide plate located between the cover plate and the air guide block.

7. The laser welding device according to claim 6, characterized in that: The welding hole includes an upper welding hole and a lower welding hole, the inner diameter of the upper welding hole is larger than the inner diameter of the lower welding hole, the lower welding hole protrudes downward and partially enters the open part of the spot welding bottom hole, the bottom of the lower welding hole is abutted against the inclined inner wall surface of the open part and an air ring is formed between the lower welding hole and the inclined inner wall surface of the open part.

8. The laser welding device according to claim 7, characterized in that: The welding hole is also provided with a plurality of micro pores which penetrate downward from the inclined inner wall surface of the open portion to the outer peripheral surface of the lower welding hole, and the micro pores connect the air ring and the outer air gap.

9. The laser welding device according to claim 8, characterized in that: The air groove of the first air guide block is connected to the air ring, and the inert gas enters the outer air gap from the air inlet hole, the air ring and a plurality of micro-air holes of the first air guide block, and rushes downward from the outer air gap along the inclined inner wall surface of the spot welding bottom hole into the welding pad of the workpiece.

10. The laser welding device according to claim 9, characterized in that: After the inert gas fills the pad under the spot welding bottom hole, it is discharged upward along the spot welding bottom hole, the through hole and the welding hole. The welding hole, the through hole and the spot welding bottom hole constitute a laser beam hole.

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