Wire filling device for improving welding efficiency of hot-formed steel tailor-welded blank

Abstract

The utility model discloses a wire filling device for improving the welding efficiency of a thermoformed steel tailor-welded blank, which relates to the technical field of laser welding and comprises a laser welding head, a wire heating assembly is arranged on the lower portion of the laser welding head and comprises a support fixedly connected to the outer surface of the lower portion of the laser welding head, and a wire filling device is arranged on the support. The end, away from the laser welding head, of the support is slidably connected with a sliding rod, the lower portion of the sliding rod is provided with an external thread, the external thread is in threaded connection with a threaded sleeve, the lower portion of the sliding rod is sleeved with a first spring, and a wire feeding pipe is inserted between the clamping plates. The laser welding head conducts laser irradiation melting on the preheated welding wire, so that the hot forming steel tailor-welded blank is welded through the welding wire, dependence of the welding wire on laser heat is reduced, the precision requirement for the relative position of the welding wire and laser is lowered, the filling efficiency and the welding seam plumpness are improved, and meanwhile the welding speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of laser welding, in particular to a wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates. Background Art

[0002] Laser welding is achieved using a continuous or pulsed laser beam. The principles of laser welding can be divided into heat conduction welding and laser deep penetration welding.

[0003] In the process of laser welding of hot-formed steel tailor-welded plates, the welding wire needs to be fed into the welding position through a wire-filling device so that the laser welding head can better align the welding wire and melt it. However, the existing welding wire is more dependent on laser heat, which means that it takes a certain amount of time for the welding wire to absorb enough laser heat to melt, resulting in a relatively slow welding speed. Moreover, since the welding wire is completely dependent on laser heat to melt, the relative position of the welding wire and the laser welding head needs to be very precise in order for the welding wire to be fully melted, which places high demands on processing accuracy and assembly to avoid problems such as poor welding quality and thus increase the difficulty of welding.

[0004] In order to solve the above problems, a wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates is proposed. Utility Model Content

[0005] In order to solve the above technical problems, a wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates is provided to solve the problems raised in the above background technology.

[0006] In order to achieve the above objectives, the present invention can be implemented by adopting the following technical solutions:

[0007] The utility model provides a wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates, comprising: a laser welding head, wherein a hot wire assembly is arranged at the lower part of the laser welding head;

[0008] The cam is provided with a spring, and the lower end of the cam is provided with a clamping plate, and a wire feeding tube is inserted into the clamping plate. Two L plates are fixedly connected to the two ends of the cam close to the end of the cam, and straight grooves are provided on the two L plates. A slider is movably connected between the two L plates. Bolts are respectively fixedly connected to the two ends of the slider, and the bolts are slidably connected in the straight grooves. A nut sleeve is threaded on the bolt, and the middle part of the slider is fixedly connected to the outer cylinder, and a resistance wire is installed on the inner ring surface of the outer cylinder. A heat conducting inner cylinder is inserted in the outer cylinder, and a heat insulating cap is sleeved on the upper part of the heat conducting inner cylinder. The heat conducting inner cylinder is interference fit with the heat insulating cap, and the heat insulating cap is plugged and connected with the wire feeding tube.

[0009] Preferably, the wire feeding tube extends through the clamping plate to between the two L-plates, and the nut sleeve is located at one end of the bolt extending to the outside of the straight groove.

[0010] Preferably, the upper port of the heat-conducting inner cylinder and the inner annular surface of the outer cylinder are in interference fit, and the lower ends of the heat-conducting inner cylinder and the outer cylinder are both beveled.

[0011] Preferably, the heat insulation cap is made of asbestos.

[0012] Preferably, a graphite layer is provided inside the outer cylinder.

[0013] As described above, the characteristics and advantages of a wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates in the utility model are:

[0014] The welding wire is preheated in advance. After the preheated welding wire is fed into the welding position between the hot-formed steel tailor-welded plates, the laser welding head irradiates and melts the preheated welding wire with a laser, so that the hot-formed steel tailor-welded plates can be welded through the welding wire, thereby reducing the welding wire's dependence on laser heat, and also reducing the accuracy requirements for the relative position of the welding wire and the laser, thereby improving the filling efficiency and weld fullness, while speeding up the welding speed.

[0015] The slide rod drives the spring to move upward and compress through the threaded sleeve, and simultaneously drives the wire feeding tube to move upward. In the process of the slide rod sliding upward, the L-plate and the clamping plate will move upward synchronously, thereby avoiding the wire feeding tube from colliding with the protrusions and the hot-formed steel tailor-welded plate. Since the lower end of the wire feeding tube is usually made of metal, the risk of bending of the metal tube at the lower end of the wire feeding tube is also avoided, thereby avoiding the situation where the wire feeding tube is bent due to collision, thereby preventing the welding wire from being delivered obstructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0017] Figure 2 It is a three-dimensional schematic diagram of the overall structure of the utility model when viewed from the bottom;

[0018] Figure 3 It is a three-dimensional schematic diagram of the overall structure shown in the utility model from a side perspective;

[0019] Figure 4 It is a three-dimensional schematic diagram of the overall structure of the hot wire assembly shown in the utility model;

[0020] Figure 5 It is a schematic diagram of the exploded structure of the heat insulation cap, the heat conducting inner cylinder, the outer cylinder and the slider shown in the utility model;

[0021] Figure 6It is a schematic diagram of the exploded structure of the heat insulation cap, the heat-conducting inner cylinder, the outer cylinder and the slider shown in the utility model from a bottom-up perspective;

[0022] Figure 7 The utility model shown in Figure 1 A schematic diagram of the enlarged structure in the middle.

[0023] Among them, the reference numerals in the present utility model are: 1. laser welding head;

[0024] 201, bracket; 202, slide bar; 203, external thread; 204, threaded sleeve; 205, spring 1; 206, clamp; 207, wire feeding tube; 208, L-plate; 209, straight groove; 210, slider; 211, bolt; 212, nut sleeve; 213, outer tube; 214, resistance wire; 215, heat-conducting inner tube; 216, heat-insulating cap. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] See 1~ Figure 7 As shown, a wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates provided by an embodiment of the utility model will be described in detail below:

[0027] A wire filling device for improving the welding efficiency of hot-formed steel tailor-welded plates comprises: a laser welding head 1, the upper part of the laser welding head 1 is fixedly connected to a welding robot, and the lower part of the laser welding head 1 is provided with a hot wire assembly;

[0028] See also Figures 1 to 3 The hot wire assembly includes a bracket 201 fixedly connected to the outer surface of the lower part of the laser welding head 1, and the end of the bracket 201 away from the laser welding head 1 is slidably connected to a slide bar 202, which slides vertically on the bracket 201, and an external thread 203 is provided at the lower part of the slide bar 202, and the external thread 203 is located at the end away from the bracket 201, and a threaded sleeve 204 is threadedly connected to the external thread 203, and a spring 205 is sleeved at the lower part of the slide bar 202, and both ends of the spring 205 are fixedly connected between the bracket 201 and the threaded sleeve 204, and a clamping plate 206 is fixedly connected to the lower end of the slide bar 202, and the clamping plate 206 is made of elastic steel plate, and the clamping plate 206 is U-shaped, and its open position is located at the end away from the slide bar 202, and the end of the clamping plate 206 away from the slide bar 202 is bolted and nut The two sides of the clamping plate 206 are close to the middle;

[0029] Please refer to Figures 4 to 7 A wire feeding tube 207 is inserted in the middle of the clamping plate 206. The wire feeding tube 207 is inclined to facilitate the stability of sending out the welding wire. Two L-plates 208 are fixedly connected on both sides of one end of the clamping plate 206 close to the slide bar 202. The wire feeding tube 207 passes through the clamping plate 206 and extends between the two L-plates 208. Straight grooves 209 are provided at the lower parts of the two L-plates 208. A slider 210 is movably connected between the two L-plates 208. Bolts 211 are fixedly connected on both sides of the slider 210. The bolts 211 are slidably connected in the straight groove 209 and one end thereof extends to the outside of the straight groove 209. A nut sleeve 212 is threadedly connected to the bolt 211. The nut sleeve 212 is located at one end of the bolt 211 extending to the outside of the straight groove 209.

[0030] The middle of the slider 210 is fixedly connected to an outer cylinder 213, and a graphite layer is arranged inside the outer cylinder 213. The graphite material makes it difficult for the molten welding wire to adhere to it, so as to prevent the molten welding wire from adhering to the outer cylinder 213. A resistance wire 214 is installed on the inner wall of the outer cylinder 213. The heating current range of the resistance wire 214 is 5-120A. After testing, it is set to 80-95A as the best hot wire state. A heat-conducting inner cylinder 215 is inserted into the outer cylinder 213. The upper port of the heat-conducting inner cylinder 215 is interference-fitted with the inner ring surface of the outer cylinder 213. The lower ends of the heat-conducting inner cylinder 215 and the outer cylinder 213 are both inclined. The incision and the oblique incision can be fitted with the hot-formed steel tailor-welded plate, which is convenient for pressing the welding wire into the welding position. A heat insulating cap 216 is sleeved on the upper part of the heat conductive inner cylinder 215. The heat conductive inner cylinder 215 and the heat insulating cap 216 are interference fit. The heat insulating cap 216 is made of a material with heat insulating properties, such as asbestos, and is used to isolate the heat emitted by the resistance wire 214 to prevent the heat from being conducted to the upper end of the wire feeding tube 207, which causes the welding wire located above the heat insulating cap 216 to be preheated and softened in advance, resulting in the welding wire being unable to be effectively fed out. The heat insulating cap 216 is plugged and connected to the wire feeding tube 207, and the two are interference fit.

[0031] The following is the entire working process and working principle of the above embodiment:

[0032] Initial setting: When in use, first rotate the nut sleeve 212 so that it does not contact the L plate 208, then manually rotate the slider 210 to drive the outer cylinder 213 and the heat-conducting inner cylinder 215 to rotate synchronously, so that the inclination angle of the outer cylinder 213 and the heat-conducting inner cylinder 215 can be consistent with the wire feeding tube 207, and then use the bolt 211 to slide in the straight groove 209 to adjust the up and down position of the slider 210, and synchronously drive the outer cylinder 213 and the heat-conducting inner cylinder 215 to move up and down until they are adjusted to the appropriate position.

[0033] After the above adjustments are completed, first pass the wire outlet end of the wire feeding tube 207 through the clamp 206 and the L plate 208, and then twist the nut on the bolt at one end of the clamp 206 to make the open ends of the clamp 206 approach each other, thereby clamping and fixing the wire feeding tube 207. When the wire feeding tube 207 passes through the clamp 206 and the L plate 208, it will also be inserted into the heat insulation cap 216.

[0034] During operation: first, install the hot-formed steel tailor-welded plate on the fixture on the processing workbench and reserve the welding area, then start the welding robot, so that the welding robot drives the laser welding head 1 to move along the welding position for welding. During welding, the bottoms of the two L-plates 208 are attached to the hot-formed steel tailor-welded plates, and the gap between the two L-plates 208 is aligned with the welding position. If the laser welding head 1 moves along the welding position and collides with a protrusion or the welding robot drives the laser welding head 1 to descend and collide with the workbench, the L-plate 208 pushes the slide bar 202 upward to slide upward on the bracket 201. During this process, the slide bar 202 drives the spring 205 to move upward and compress the spring 205, and simultaneously drives the wire feeding tube 207 to move upward together. As the slide bar 202 slides upward, the L-plate 208, the clamping plate 206 and the wire feeding tube 207 will move upward synchronously, thereby preventing the wire feeding tube 207 from colliding with protrusions or hot-formed steel tailor-welded plates. Since the lower end of the wire feeding tube 207 is usually made of metal, the risk of bending of the metal tube at the lower end of the wire feeding tube 207 is also avoided, thereby avoiding the problem of the wire feeding tube 207 bending due to collision, thereby obstructing the delivery of the welding wire.

[0035] While the welding robot drives the laser welding head 1 to move along the welding position, the welding wire inside the heat-conducting inner cylinder 215 is preheated so that the welding wire is melted into a semi-liquid state in advance, and then the preheated welding wire is discharged from the bottom of the heat-conducting inner cylinder 215 to the welding position, and then the laser welding head 1 irradiates and melts the preheated welding wire with a laser, so that the hot-formed steel tailor-welded plate can be welded. Since the welding wire is preheated in advance, the welding wire’s dependence on laser heat is reduced, and the accuracy requirements for the relative position of the welding wire and the laser are also reduced. In addition, the filling efficiency and weld fullness are improved, while the welding speed is accelerated.

[0036] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wire-filling device for improving the welding efficiency of hot-formed steel tailor-welded blanks, characterized in that: include: A laser welding head (1), wherein a hot wire assembly is provided at the lower portion of the laser welding head (1); The hot wire assembly comprises a bracket (201) fixedly connected to the outer surface of the lower part of the laser welding head (1), the bracket (201) is slidably connected to a slide rod (202) at one end away from the laser welding head (1), an external thread (203) is provided at the lower part of the slide rod (202), a threaded sleeve (204) is threadedly connected to the external thread (203), a spring (205) is sleeved on the lower part of the slide rod (202), a clamping plate (206) is fixedly connected to the lower end of the slide rod (202), a wire feeding tube (207) is inserted into the clamping plate (206), and two L-plates (208) are fixedly connected to both sides of the end of the clamping plate (206) close to the slide rod (202), and the two L-plates (208) are provided with straight grooves (209) ), a slider (210) is movably connected between the two L-plates (208), and bolts (211) are fixedly connected on both sides of the slider (210), and the bolts (211) are slidably connected in the straight groove (209), and a nut sleeve (212) is threadedly connected on the bolt (211), and an outer cylinder (213) is fixedly connected to the middle of the slider (210), and a resistance wire (214) is installed on the inner ring surface of the outer cylinder (213), and a heat-conducting inner cylinder (215) is inserted into the outer cylinder (213), and a heat-insulating cap (216) is sleeved on the upper part of the heat-conducting inner cylinder (215), and the heat-conducting inner cylinder (215) and the heat-insulating cap (216) are interference-fitted, and the heat-insulating cap (216) is plugged and connected to the wire feeding tube (207).

2. A wire-filling device for improving the welding efficiency of hot-formed steel tailor-welded blanks according to claim 1, characterized in that: The wire feeding tube (207) passes through the clamping plate (206) and extends between the two L-plates (208). The nut sleeve (212) is located at the end of the bolt (211) extending to the outside of the straight slot (209).

3. The wire-filling device for improving the welding efficiency of hot-formed steel tailor-welded blanks according to claim 1, characterized in that: The upper port of the heat-conducting inner cylinder (215) and the inner annular surface of the outer cylinder (213) are in interference fit, and the lower ends of the heat-conducting inner cylinder (215) and the outer cylinder (213) are both beveled.

4. The wire-filling device for improving the welding efficiency of hot-formed steel tailor-welded blanks according to claim 1, characterized in that: The heat insulation cap (216) is made of asbestos.

5. The filler wire device for improving the welding efficiency of hot-formed steel tailor-welded blanks according to claim 1, characterized in that: A graphite layer is provided inside the outer cylinder (213).

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