A high-speed laser welding device and a welding method thereof

Abstract

The application provides a high-speed laser welding device and a welding method thereof, which comprises a device body, a welding mechanism arranged on the device body, and a laser welding head; a conveying mechanism comprising a reciprocating rod assembly and a sliding assembly penetrating through the device body respectively, the reciprocating rod assembly and the sliding assembly being arranged perpendicularly to each other in the device body, and a welding area being formed in the region where the reciprocating rod assembly and the sliding assembly are perpendicular to each other, the laser welding head being arranged above the welding area, the reciprocating rod assembly and the sliding assembly moving horizontally along the axial direction respectively, crank lifting assemblies being arranged on the opposite sides of the device body and lifting along the vertical direction of the device body, and a Docking pressing plate being connected to the vertical end of the crank lifting assemblies, and the Docking pressing plate being driven by the crank lifting assemblies to press and combine workpieces to be welded in the welding area. The laser welding device can ensure the welding quality and speed up the welding rhythm.

Description

Technical Field

[0001] This invention relates to the field of battery tray welding technology, specifically to a high-speed laser welding device and its welding method. Background Technology

[0002] With the rapid development of new energy vehicles both domestically and internationally, the demand for battery trays in these vehicles is increasing daily. The battery tray housing is a key load-bearing component for the power battery in new energy vehicles, and is made of either steel or aluminum alloy; structurally, it is connected to the vehicle's chassis. Due to the complex and varied road conditions, the battery tray experiences very complex stresses, thus requiring high standards for its rigidity, weight, and sealing.

[0003] Currently, resistance spot welding is used for the production of battery box bodies. However, resistance spot welding has several drawbacks: it requires a certain welding space and access channels for the welding gun to reach, thus placing high demands on the product structure; the welding gun requires steps such as advancing, spotting, and retracting each time it is used, which takes about 4 seconds and hinders the production capacity required for ultra-high cycle times; in addition, resistance spot welding has disadvantages such as large heat input, wide heat-affected zone, and difficulty in temperature control, which can lead to problems such as workpiece deformation and damage to the back material.

[0004] Therefore, it is clear that how to simultaneously overcome the problems of slow welding cycle and welding quality is an urgent issue that needs to be addressed. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to simultaneously improve the welding cycle time and welding quality of battery trays.

[0006] To address the aforementioned technical problems, the present invention provides a high-speed laser welding apparatus, comprising an apparatus body, wherein the apparatus body is provided with:

[0007] A welding mechanism, comprising laser welding heads arranged side by side, the laser welding heads being movable up and down;

[0008] The conveying mechanism includes a reciprocating rod assembly and a sliding assembly that pass through the main body of the device. The reciprocating rod assembly and the sliding assembly are arranged perpendicularly to each other within the main body of the device, and the area where they are perpendicular to each other is a welding area. The laser welding head is arranged above the welding area. The reciprocating rod assembly and the sliding assembly move horizontally reciprocally along the axial direction. Crank lifting assemblies that move vertically along the main body of the device are arranged on opposite sides of the main body. A docking pressure plate is connected to the vertical end of the crank lifting assembly. The crank lifting assembly drives the docking pressure plate to descend and press against the workpiece to be welded in the welding area.

[0009] Furthermore, the reciprocating rod assembly is provided with a large component upper part position and a lower part position at both ends along the axial direction; the sliding component is provided with a first small component upper part position and a second small component upper part position at both ends along the axial direction, the large component upper part position is placed with a large component to be welded, and the first small component upper part position and the second small component upper part position are both placed with small components to be welded.

[0010] Furthermore, a slide rail is provided between the first small part mounting position and the second small part mounting position, and the first small part mounting position and the second small part mounting position slide along the slide rail to the welding area.

[0011] Furthermore, both the upper surfaces of the first and second small component mounting positions are provided with substrates, and multiple rows of positioning pins are uniformly arranged on the substrates. The positioning pins have an L-shaped structure and include a low positioning pin and a high positioning pin arranged back to back. The low positioning pin is used to position and support the small component to be welded, and the high positioning pin is used to position and support the large component to be welded. The thickness of the large component to be welded is greater than the thickness of the small component to be welded.

[0012] A high-speed laser welding method, applied to the aforementioned high-speed laser welding apparatus, the method comprising the following steps:

[0013] S1. The loading robot loads the small parts to be welded onto the sliding assembly and drops them into the low positioning pin, and loads the large parts to be welded onto the large parts loading position.

[0014] S2. The small part to be welded, carried by the first small part position on the sliding assembly, slides horizontally into the welding area. At the same time, the large part to be welded is transported to the welding area by the reciprocating rod assembly and falls into the high positioning pin. At this time, the large part to be welded is located above the small part to be welded.

[0015] S3. The crank lifting assembly drives the docking pressure plate to descend to press the mating surfaces of the large part to be welded and the small part to be welded.

[0016] S4. The laser welding head is aligned with the mating surfaces of the large part to be welded and the small part to be welded to perform welding.

[0017] S5. After welding is completed, the crank lifting assembly drives the docking pressure plate to rise.

[0018] S6. The reciprocating rod assembly transports the welded workpiece to the lower part position. At the same time, the reciprocating rod assembly synchronously transports the new large part to be welded to the welding area, and the small part to be welded carried by the second small part upper part position on the sliding assembly synchronously slides into the welding area, and so on.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention uses a laser welding device that ensures welding quality while accelerating the welding cycle. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the welding mechanism and the small part to be welded according to the present invention;

[0023] Figure 3 This is a schematic diagram of the small part to be welded according to the present invention;

[0024] Figure 4 This is a rear view of the welding mechanism and the small part to be welded according to the present invention;

[0025] Figure 5 This is a schematic diagram of the welding mechanism and the conveying of the workpiece to be welded according to the present invention.

[0026] In the diagram: 000, Device body; 110, Reciprocating rod assembly; 111, Large component upper position; 112, Lower component position; 120, Sliding assembly; 121, First small component upper position; 122, Second small component upper position; 123, Slide rail; 124, Base plate; 125, Positioning pin; 1250, Low position positioning pin; 1251, High position positioning pin; 130, Crank lifting assembly; 131, Docking pressure plate; 210, Laser welding head. Detailed Implementation

[0027] To make the technical solutions and effects 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. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0028] like Figure 1-5 As shown, the present invention aims to provide a high-speed laser welding device to overcome the welding quality problems caused by resistance spot welding and to shorten the welding cycle. The laser welding device mainly includes a device body 000, on which a welding mechanism and a conveying mechanism are mounted.

[0029] The welding mechanism includes laser welding heads 210 arranged side by side. The laser welding heads 210 can move up and down. The laser welding heads 210 can be fixed to the frame on the top of the device body 000, or they can follow the crank lifting assembly 130 to achieve lifting action.

[0030] The conveying mechanism includes a reciprocating rod assembly 110, a sliding assembly 120, and a crank lifting assembly 130. The reciprocating rod assembly 110 traverses the device body 000, and the sliding assembly 120 traverses the device body 000 and is perpendicular to the reciprocating rod assembly 110 within the device body 000. This perpendicular area is the welding area. A laser welding head 210 is positioned above the welding area. The reciprocating rod assembly 110 and the sliding assembly 120 reciprocate horizontally along the axial direction. The crank lifting assembly 130 is located on opposite sides within the device body 000 and moves vertically up and down along the vertical direction of the device body 000. A docking pressure plate 131 is connected to the vertical end of the crank lifting assembly 130. The crank lifting assembly 130 drives the docking pressure plate 131 to descend and press against the workpiece to be welded in the welding area.

[0031] The reciprocating rod assembly 110 has a large component upper position 111 and a lower component position 112 at both ends along the axial direction; the sliding assembly 120 has a first small component upper position 121 and a second small component upper position 122 at both ends along the axial direction; a large component to be welded is placed on the large component upper position 121, and small components to be welded are placed on both the first small component upper position 121 and the second small component upper position 122. A slide rail 123 is provided between the first small component upper position 121 and the second small component upper position 122, and the first small component upper position 121 and the second small component upper position 122 slide along the slide rail 123 to the welding area. A base plate 124 is provided on the upper surface of both the first small component upper position 121 and the second small component upper position 122, and multiple rows of positioning pins 125 are evenly arranged on the base plate 124. The positioning pin 125 has an L-shaped structure. The positioning pin 125 includes a low positioning pin 1250 and a high positioning pin 1251 arranged back to back. The low positioning pin 1250 is used to position and support the small part to be welded, and the high positioning pin 1251 is used to position and support the large part to be welded. The thickness of the large part to be welded is greater than the thickness of the small part to be welded. In this way, during welding, the large part to be welded is above the small part to be welded, so that the small part to be welded below will not be welded through.

[0032] The specific welding steps are as follows:

[0033] Step 1: The loading robot loads the small parts to be welded onto the sliding assembly 120 and drops them into the low positioning pin 1250, and loads the large parts to be welded onto the large parts loading position 111.

[0034] In the second step, the small part to be welded, carried by the first small part mounting position 121 on the sliding assembly 120, slides horizontally into the welding area. At the same time, the large part to be welded is transported to the welding area by the reciprocating rod assembly 110 and falls into the high positioning pin 1251. At this time, the large part to be welded is located above the small part to be welded.

[0035] The third step is to lower the crank lifting assembly 130 to press the mating surfaces of the large part to be welded and the small part to be welded.

[0036] Step 4: The laser welding head 210 is aligned with the mating surfaces of the large part to be welded and the small part to be welded for welding.

[0037] Step 5: After welding is completed, the crank lifting assembly 130 drives the docking pressure plate 131 to rise.

[0038] Step 6: The reciprocating rod assembly 110 transports the welded workpiece to the lower part position 112. At the same time, the reciprocating rod assembly 110 synchronously transports a new large part to be welded to the welding area, and the small part to be welded carried by the second small part upper part position 122 on the sliding assembly 120 synchronously slides into the welding area, and so on.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed laser welding apparatus, comprising an apparatus body (000), characterized in that, The device body (000) is provided with: A welding mechanism, comprising laser welding heads (210) arranged side by side, wherein the laser welding heads (210) are movable up and down; The conveying mechanism includes a reciprocating rod assembly (110) and a sliding assembly (120) that pass through the device body (000). The reciprocating rod assembly (110) and the sliding assembly (120) are arranged perpendicularly to each other within the device body (000), and the area where they are perpendicular to each other is a welding area. The laser welding head (210) is arranged above the welding area. The reciprocating rod assembly (110) and the sliding assembly (120) move horizontally along the axial direction. Crank lifting assemblies (130) that move up and down along the vertical direction of the device body (000) are arranged on opposite sides of the device body (000). The crank lifting assembly (130) is vertically connected to a docking pressure plate (131). The crank lifting assembly (130) drives the docking pressure plate (131) to descend and press against the workpiece to be welded in the welding area. The reciprocating rod assembly (110) is provided with a large part upper position (111) and a lower part position (112) at both ends along the axial direction. The sliding assembly (120) is provided with a first small part upper position (121) and a second small part upper position (122) at both ends along the axial direction. The large part to be welded is placed on the large part upper position (111). The first small part upper position (121) and the second small part upper position (122) are connected. Each component position (122) has a small component to be welded placed on it; the upper surfaces of the first component upper position (121) and the second component upper position (122) are provided with a substrate (124), and multiple rows of positioning pins (125) are uniformly arranged on the substrate (124); the positioning pins (125) are L-shaped, and the positioning pins (125) include a low positioning pin (1250) and a high positioning pin (1251) arranged back to back. The low positioning pin (1250) is used to position and support the small component to be welded, and the high positioning pin (1251) is used to position and support the large component to be welded. The thickness of the large component to be welded is greater than the thickness of the small component to be welded.

2. The high-speed laser welding apparatus according to claim 1, characterized in that, A slide rail (123) is provided between the first small part mounting position (121) and the second small part mounting position (122), and the first small part mounting position (121) and the second small part mounting position (122) slide along the slide rail (123) to the welding area.

3. A high-speed laser welding method, applied to the high-speed laser welding apparatus according to any one of claims 1-2, characterized in that, The method includes the following steps: S1. The loading robot loads the small parts to be welded onto the sliding assembly (120) and drops them into the low positioning pin (1250), and loads the large parts to be welded onto the large parts loading position (111). S2, the small part to be welded carried by the first small part mounting position (121) on the sliding assembly (120) slides horizontally into the welding area. At the same time, the large part to be welded is transported to the welding area by the reciprocating rod assembly (110) and the large part to be welded falls into the high positioning pin (1251). At this time, the large part to be welded is located above the small part to be welded. S3, the crank lifting assembly (130) drives the docking pressure plate (131) to descend to press the mating surfaces of the large part to be welded and the small part to be welded; S4. The laser welding head (210) is aligned with the mating surfaces of the large part to be welded and the small part to be welded to perform welding. S5. After welding is completed, the crank lifting assembly (130) drives the docking pressure plate (131) to rise. S6. The reciprocating rod assembly (110) transports the welded workpiece to the lower part position (112). At the same time, the reciprocating rod assembly (110) synchronously transports the new large part to be welded to the welding area, and the small part to be welded carried by the second small part upper part position (122) on the sliding component (120) synchronously slides into the welding area, and so on.

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