Tailored blank laser welding cooling structure

Abstract

The tailored blank laser welding cooling structure comprises a base plate base, a clamping mechanism and a cooling nozzle for cooling the upper surface of a tailored blank welding workpiece, and a containing groove with an opening in the top is formed in the base plate base; a cooling block is arranged in the containing groove, and an avoiding groove used for containing a welding seam of the tailor-welded workpiece is formed in the cooling block. The cooling block is provided with an air channel, the air channel communicates with the receding groove and the circulation component to form a closed circulation loop containing a cooling medium, the circulation component is used for driving the cooling medium to circularly flow, and the cooling medium conducts heat exchange cooling through the heat exchange assembly. The closed circulation loop drives the cooling medium to circularly flow through the welding seam position on the lower surface of the tailor-welded workpiece so as to cool the bottom welding seam, meanwhile, heat at the welding seam can be prevented from being diffused to the outer side, the cooling medium can be cooled through the heat exchange assembly, the two sides of the welding seam can be cooled at the same time in cooperation with the cooling nozzle, and the welding seam can be cooled more conveniently. And therefore, the cooling effect on the welding seam is improved.

Description

Technical Field

[0001] This application relates to the field of laser welding technology, specifically to a laser welding cooling structure. Background Technology

[0002] Laser welding technology has advantages such as concentrated energy input, fast welding speed, and accurate positioning, and is mainly used in the automotive industry. However, when high-strength steel sheets for automobiles are laser welded, the high residual stress at the weld joint leads to various defects such as a significant tendency for cold cracking and softening of the heat-affected zone.

[0003] The high energy density of laser welding can lead to localized instantaneous high temperatures (up to several thousand degrees Celsius). If the heat continues to accumulate, the heat-affected zone will expand, causing the surrounding materials to coarsen, soften (e.g., aluminum alloys) or become brittle (e.g., high-carbon steel). By using forced heat dissipation, the temperature of the weld and its surrounding area can be rapidly reduced, limiting the range and preserving the original mechanical properties of the base material.

[0004] In existing technologies, such as the water-cooled laser welding device with announcement number CN217193382U, cooling water is sprayed from the top of the workpiece to cool the welding area. However, for thin workpiece materials (such as steel plates for automobile bodies), heat can easily penetrate to the other side. Even if welding is done on one side, the material on the other side may reach the melting temperature due to heat conduction, resulting in double-sided fusion. Therefore, only the upper surface of the workpiece can be cooled, and the lower surface cannot be cooled. Thus, the cooling capacity is limited. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a laser welding cooling structure that uses circulating cooling air to cool the weld seam on the lower surface of the welded workpiece, thereby improving the cooling effect on the welded area. The technical solution is as follows:

[0006] A laser welding cooling structure includes a substrate base and a clamping mechanism, wherein the substrate base is provided with a receiving groove with a top opening;

[0007] The receiving groove is provided with a cooling block, and the cooling block is provided with a clearance groove for placing the welding seam of the welded workpiece;

[0008] The cooling block is provided with an air passage, which connects the clearance groove and the circulation component to form a closed circulation loop containing the cooling medium. The circulation component is used to drive the cooling medium to circulate.

[0009] A heat exchange assembly for exchanging heat with and cooling the cooling medium.

[0010] Preferably, the cooling block is provided with a cooling groove, which is connected to the air passage.

[0011] Preferably, the air passage includes a main channel, a first flow channel and a second flow channel communicating with the main channel, the first flow channel communicating with the clearance groove, and the second flow channel extending toward the opening side.

[0012] More preferably, the first flow channel is inclined toward the opening side.

[0013] Preferably, the surface of the cooling block is flush with the substrate base.

[0014] Preferably, the cooling block is made of a thermally conductive material.

[0015] Preferably, the heat exchange component includes a housing, at least one cooling component and a heat dissipation component, the cooling component includes a hot end and a cold end, both the hot end and the cold end are provided with heat dissipation fins, and the cold end is disposed inside the housing.

[0016] Preferably, it further includes a supply device and a detection component, wherein the supply device is used to supply cooling medium to the closed loop; and the detection component is used to detect the concentration and temperature of the cooling medium in the closed loop.

[0017] Preferably, the circulation component is located at the front end of the heat exchange assembly.

[0018] Preferably, it also includes a cooling nozzle, which is used to spray a cooling medium to cool the upper surface of the welded workpiece.

[0019] The beneficial effects of this application are as follows:

[0020] (1) This application uses a closed-loop circulation to drive the cooling medium to circulate through the weld seam on the lower surface of the welded workpiece to cool the bottom weld seam. At the same time, it can prevent the heat at the weld seam from spreading to the outside. The heat exchange component can cool the cooling medium, thereby improving the cooling effect on the weld seam.

[0021] (2) When used with cooling nozzles, the weld seam can be cooled on both sides at the same time to further improve the cooling effect of the weld seam. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of one embodiment of this application;

[0023] Figure 2 This application Figure 1 Schematic diagram of the intermediate cooling block structure;

[0024] Figure 3 Another embodiment of the present application is illustrated in the structural diagram;

[0025] Figure 4 This application Figure 3 Schematic diagram of the intermediate cooling block structure;

[0026] Figure 5 This is a schematic diagram of the closed loop structure of this application.

[0027] In the picture:

[0028] 00. Welded workpieces, A. Weld seam;

[0029] 10. Base plate base; 100. Receiving groove; 110. Circulation component;

[0030] 20. Cooling block; 200. Clearance groove;

[0031] B. Airway, 30. Main passage, 40. First flow channel, 50. Second flow channel;

[0032] 60. Cooling tank; 70. Heat exchange assembly; 80. Supply device; 90. Detection component. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described in this application are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0034] See Figures 1 to 5 To further elaborate on this application:

[0035] Combination Figure 1 A laser welding cooling structure includes a substrate base 10 and a clamping mechanism (not shown), as well as a cooling nozzle (not shown) for cooling the upper surface of the welding workpiece 00. The cooling nozzle can be disposed on the welding device, and the clamping mechanism is used to limit the position of the welding workpiece on the substrate base 10. The clamping mechanism and the cooling nozzle can be implemented using existing technology.

[0036] The substrate base 10 has a receiving groove 100 with a top opening. A cooling block 20 is provided within the receiving groove 100. The cooling block 20 has a clearance groove 200 for placing the welding seam A of the weldment workpiece 00, to prevent the weldment workpiece 00 from being welded together with the substrate base 10 during welding. Figure 1 and Figure 3 The cooling block 20 can be a one-piece structure or a split structure.

[0037] Combination Figure 5The cooling block 20 is provided with an air passage B, which connects the clearance groove 200 and the circulation component 110 to form a closed circulation loop containing a cooling medium. The circulation component 110 is used to drive the cooling medium to circulate. The circulation component 110 can be a blower. In this embodiment, the cooling medium is an inert gas, such as argon or helium, which can cool the weld seam A of the welded workpiece 00 while also providing protection. The closed circulation loop can improve the utilization of the cooling medium and reduce waste. Of course, the cooling medium can also be air, which can at least meet the cooling requirements of the weld seam.

[0038] It also includes a heat exchange component 70, which is used to exchange heat with and cool the cooling medium to reduce the temperature of the cooling medium and thereby improve the cooling effect on the weld seam A of the welded workpiece 00.

[0039] In use, the welded workpiece 00 is placed on the surface of the substrate base 10 for splicing, and the weld seam A is placed in the clearance groove 200. The welded workpiece 00 covers the clearance groove 200 to form the closed loop. By providing cooling medium into the air passage B, the circulation component 110 drives the cooling medium to circulate in the closed loop, so that the cooling medium flows in the clearance groove 200 to cool the weld seam A. The cooling medium is cooled by the heat exchange component 70, thereby improving the cooling effect on the weld seam A.

[0040] It is understood that the closed-loop circulation circuit is formed by sequentially connecting the air passage B within the cooling block 20, the circulation component 110, the heat exchange assembly 70, and the air passage B via a connecting pipe; that is, the length of the clearance groove 200 is consistent with the length of the weld seam A. Preferably, the circulation component 110 is located at the front end of the heat exchange assembly 70, and the cooling medium is driven by the circulation component 110 to flow through the heat exchange assembly 70 for heat exchange and then directly delivered to the cooling block 20 to improve the cooling effect.

[0041] In some embodiments, the clearance groove 200 may also be connected to the outside; that is, the length of the weld seam A of the welded workpiece 00 is less than the length of the clearance groove 200, and the air circulation driven by the circulation component 110 cools the weld seam A in the clearance groove 200.

[0042] This application uses a closed-loop circulation system to cool the weld seam A on the lower surface of the welded workpiece 00, while reducing the waste of cooling medium; the heat exchange component 70 cools the cooling medium, thereby improving the cooling effect on weld seam A; and the cooling nozzle can cool both sides of weld seam A.

[0043] In this embodiment, the air passage B includes a main channel 30, and a first flow channel 40 and a second flow channel 50 connected to the main channel 30; the first flow channel 40 is connected to the clearance groove 200, and part of the cooling medium in the main channel 30 enters the clearance groove 200 through the first flow channel 40 to cool the weld seam A; the second flow channel 50 extends to the opening side and can guide part of the cooling medium to blow toward the welded workpiece 00, preventing the heat from the weld seam A from spreading outward.

[0044] In some embodiments, the surface of the cooling block 20 is flush with the substrate base 10, that is, the upper surface of the cooling block 20 is in contact with the welded workpiece 00; the cooling block 20 is provided with a cooling groove 60, which is connected to the air passage B through the second flow channel 50. The cooling groove 60 is located on the upper surface of the cooling block 20, so that the cooling medium in the cooling groove 60 can be blown toward the welded workpiece 00, and simultaneously flow along the lower surface of the welded workpiece 00 through the weld seam A.

[0045] The cooling block 20 is made of a thermally conductive material; the cooling block 20 can be made of materials such as copper or aluminum. When the cooling medium flows through the air passage B, it can cool the cooling block 20. Since the upper surface of the cooling block 20 is in contact with the welded workpiece 00, the cooling block 20 can further cool both sides of the weld seam A, preventing heat from diffusing to the outside of the weld seam A.

[0046] In this embodiment, the first flow channel 40 is inclined toward the opening side to guide the cooling medium towards the weld seam A.

[0047] In this embodiment, the heat exchange assembly 70 includes a housing, at least one cooling component, and a heat dissipation component. The cooling component can be a thermoelectric cooler, comprising a hot end and a cold end disposed opposite each other, both with heat dissipation fins to improve heat exchange efficiency. The heat dissipation component dissipates heat from the hot end to improve the cooling efficiency of the cooling component. The cold end is located within the housing. The housing contains a channel connecting a closed loop, allowing the cooling medium to contact the heat dissipation fins on the cold end as it passes through the housing, thereby exchanging heat and reducing the temperature of the cooling medium.

[0048] In some embodiments, a supply device 80 and a detection component 90 may be included. The supply device 80 is used to supply inert gas to the closed loop. The gas supply device may include a high-pressure tank and a switching valve. The detection component 90 is used to detect the concentration and temperature of the cooling medium. The detection component 90 may be disposed on the housing.

Claims

1. A laser welding cooling structure, comprising a substrate base and a clamping mechanism, characterized in that: The substrate base is provided with a receiving groove with an opening at the top; The receiving groove is provided with a cooling block, and the cooling block is provided with a clearance groove for placing the welding seam of the welded workpiece; The cooling block is provided with an air passage, which connects the clearance groove and the circulation component to form a closed circulation loop containing a cooling medium. The circulation component is used to drive the cooling medium to circulate. A heat exchange assembly for exchanging heat with and cooling the cooling medium.

2. The laser welding cooling structure according to claim 1, characterized in that: The cooling block is provided with a cooling groove, which is connected to the air passage.

3. The laser welding cooling structure according to claim 1, characterized in that: The air passage includes a main channel, a first flow channel and a second flow channel communicating with the main channel. The first flow channel communicates with the clearance groove, and the second flow channel extends toward the opening side.

4. The laser welding cooling structure according to claim 3, characterized in that: The first flow channel is inclined toward the opening side.

5. The laser welding cooling structure according to claim 1, characterized in that: The surface of the cooling block is flush with the substrate base.

6. The laser welding cooling structure according to claim 1, characterized in that: The cooling block is made of a thermally conductive material.

7. The laser welding cooling structure according to claim 1, characterized in that: The heat exchange assembly includes a housing, at least one refrigeration component and a heat dissipation component. The refrigeration component includes a hot end and a cold end, both of which are provided with heat dissipation fins. The cold end is located inside the housing.

8. The laser welding cooling structure according to claim 1, characterized in that: It also includes a supply device and a detection component, wherein the supply device is used to supply cooling medium to the closed loop; and the detection component is used to detect the concentration and temperature of the cooling medium in the closed loop.

9. The laser welding cooling structure according to claim 1, characterized in that: The circulation component is located at the front end of the heat exchange assembly.

10. The laser welding cooling structure according to claim 1, characterized in that: It also includes cooling nozzles, which are used to spray cooling media to cool the upper surface of the welded workpiece.

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