Gantry type longitudinal beam welding clamp device and welding method

Abstract

The invention provides a gantry type longitudinal beam welding clamp device and a welding method. The gantry type longitudinal beam welding clamp device comprises a clamp support, a positioning and fixing device, a positive pressing mechanism and a plurality of side pressing mechanisms. Wherein the positive pressure mechanism and the side pressure mechanism work independently, positive pressure adopts an electric cylinder driven integral pressing mode, side pressure adopts an air cylinder pressing mode, interference between a welding gun and the positive pressure mechanism during working is avoided, continuous welding of a longitudinal beam welding bead is achieved, meanwhile, the creativity of the clamp is better, the welding space is larger, the welding posture is guaranteed, and the product welding quality is improved. In addition, a welding shrinkage preventing device is further designed on the welding clamp device, welding shrinkage in the welding process can be resisted, and part deformation in the welding process is reduced.

Description

Technical Field

[0001] The invention relates to the field of automobile welding production, and in particular to a gantry type longitudinal beam welding fixture device and a welding method. Background Art

[0002] like Figure 1 , Figure 2 As shown in the figure, the longitudinal beam weld of the frame is usually designed with a continuous full welding process. The welding station uses a welding fixture to weld the longitudinal beam inner plate and the longitudinal beam outer plate into the longitudinal beam inner and outer plate assembly. The continuous full welding design of the longitudinal beam weld requires that the weld cannot be interrupted during the welding process to ensure welding strength and product quality.

[0003] At present, most of the longitudinal beam welding fixtures are driven by a cylinder and use a strong clamping mechanism that performs positive pressure and side pressure at the same time. This fixture clamps the workpiece through positive pressure and side pressure mechanisms at the same time to ensure the stability of the workpiece during welding. However, this design has the following problems:

[0004] (1) Interference between the positive pressure mechanism and the welding gun path: During the welding process, the connection seat of the positive pressure clamping mechanism interferes with the welding path of the welding gun, resulting in interruption of the weld and inability to achieve continuous welding.

[0005] (2) Segment welding: In the area with positive pressure mechanism, the welding gun needs to skip the interference area and perform segment welding. Frequent arc starting and arc ending operations affect the welding strength.

[0006] (3) Limited welding space: The welding space at the positive pressure mechanism is small, resulting in poor welding posture and affecting welding quality. Summary of the invention

[0007] In view of the defects in the prior art, the purpose of the present invention is to provide a gantry-type longitudinal beam welding fixture device and a welding method, which separates the positive pressure and side pressure mechanisms to avoid interference between the welding gun and the positive pressure mechanism when working, realize continuous welding of the longitudinal beam weld, make the fixture more innovative, and provide a larger welding space, thereby ensuring the welding posture and improving the product welding quality.

[0008] In order to achieve the above technical effects, the present invention adopts the following technical solutions:

[0009] According to a first aspect of the present invention, a gantry-type longitudinal beam welding fixture device is provided, which is used to weld a longitudinal beam outer plate and a longitudinal beam inner plate into a longitudinal beam assembly, and comprises the following components: a fixture support, a positioning and fixing device, a positive pressure mechanism, and a plurality of side pressure mechanisms; the fixture support is arranged on both sides of the entire fixture device, the positive pressure mechanism is arranged on the fixture support, and the plurality of side pressure mechanisms are symmetrically distributed on both sides of the assembly position of the longitudinal beam inner plate and the longitudinal beam outer plate;

[0010] The positioning and fixing device includes a positioning telescopic pin and a limiting device at both ends of the longitudinal beam, which is used for positioning and fixing the longitudinal beam inner plate and the longitudinal beam outer plate during the assembly process; the positioning telescopic pin is arranged at the assembly position of the longitudinal beam outer plate and the longitudinal beam inner plate in the fixture; the limiting devices at both ends of the longitudinal beam are arranged on both sides of the open end of the longitudinal beam outer plate, and a limiting block is arranged thereon to prevent the workpiece from moving during the welding process;

[0011] The positive pressure mechanism comprises a positive pressure beam, a positive pressure slide mechanism, a slide locking device and a positive pressure driving mechanism; wherein the positive pressure slide mechanism is fixed on the fixture supports on both sides and connected to the two ends of the positive pressure beam, and is used to drive the positive pressure beam to move horizontally to just above the workpiece; the positive pressure driving mechanism is a driving electric cylinder, which is fixed on the fixture support and connected to the two ends of the positive pressure beam, and is used to drive the positive pressure beam to move vertically above the workpiece; the slide locking device is arranged at the end of the positive pressure slide mechanism, and is used to lock the sliding position of the positive pressure slide mechanism; the positive pressure beam is arranged on the positive pressure slide mechanism, and can move in the horizontal direction along the positive pressure slide, and a plurality of positive pressure sliding blocks are also arranged on the positive pressure beam;

[0012] The plurality of side pressure mechanisms are divided into a front side pressure mechanism and a rear side pressure mechanism, each of which is provided with a plurality of side pressure blocks and a driving cylinder, the driving cylinder driving the side pressure blocks to press the side of the workpiece to prevent the workpiece from lateral displacement during welding;

[0013] When the gantry type longitudinal beam welding fixture is working, the positive pressure mechanism and the side pressure mechanism work independently. The positive pressure mechanism drives the positive pressure beam through the electric cylinder to positively press the parts; the side pressure mechanism drives the side pressure blocks through the side pressure cylinder to press the parts from both sides.

[0014] Optionally, the number of the side pressure mechanisms is 12, of which the number of the front end side pressure mechanisms is 6 and the number of the rear end side pressure mechanisms is 6.

[0015] Optionally, it also includes a component pre-pressing device, which is arranged in the fastening area of ​​the longitudinal beam inner plate and the longitudinal beam outer plate, and is used to temporarily press the longitudinal beam inner plate and the longitudinal beam outer plate to ensure that the two are tightly fastened.

[0016] Optionally, it also includes a device for preventing welding shrinkage, which is connected to the rear section side pressure mechanism and is used to apply continuous pre-tension to the rear section of the longitudinal beam assembly formed by buckling the longitudinal beam inner plate and the longitudinal beam outer plate to offset welding shrinkage deformation.

[0017] Optionally, the device for preventing welding shrinkage includes a slide mechanism and an anti-shrinkage drive cylinder, wherein the slide mechanism is arranged on the rear side pressure mechanism, and the anti-shrinkage drive cylinder is connected to the slide mechanism to drive the slide mechanism to drive the rear side pressure mechanism to move;

[0018] When the side pressure is completed, the anti-shrinkage driving cylinder retracts, and a continuous pre-tension is applied to the rear section of the longitudinal beam assembly through the rear section side pressure mechanism on the slide mechanism to offset the welding shrinkage deformation.

[0019] According to a second aspect of the present invention, a gantry type integral welding method is provided, which is implemented using the above-mentioned gantry type longitudinal beam welding fixture device, and comprises the following steps:

[0020] Step S1. Manually place the longitudinal beam outer plate in the fixture and position it with the positioning telescopic pins, push the limit blocks on the limit devices at both ends of the longitudinal beam into the longitudinal beam outer plate; install the longitudinal beam inner plate into the fixture, position it with the positioning telescopic pins and buckle it with the longitudinal beam outer plate;

[0021] Step S2. The positive pressure slide mechanism drives the positive pressure beam to move to the top of the workpiece, and the positive pressure drive mechanism drives the positive pressure beam down to the pre-installed position to initially press the workpiece;

[0022] Step S3. The cylinder of the component pre-pressing device is pushed out to ensure that the inner plate of the longitudinal beam and the outer plate of the longitudinal beam are buckled;

[0023] Step S4. The driving cylinders of the side pressure mechanism are operated in sequence to press the side of the workpiece in sections, the positive pressure driving mechanism drives the positive pressure beam to press down to the working position for the second time, and the pre-pressing device for the assembly is retracted; the rear side pressure mechanism applies pre-tension to the workpiece to resist welding deformation;

[0024] Step S5. The welding robot continuously welds along the longitudinal beam weld;

[0025] Step S6. After welding is completed, the positive pressure mechanism and the side pressure mechanism are reset.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The gantry type longitudinal beam welding fixture provided by the present invention separates the positive pressure and side pressure mechanisms. The positive pressure uses an overall clamping form driven by an electric cylinder, and the side pressure uses a cylinder clamping method, so as to avoid interference between the welding gun and the positive pressure mechanism when the welding gun is working, thereby realizing continuous welding of the longitudinal beam weld. At the same time, the fixture has better creativity and a larger welding space, which ensures the welding posture and improves the welding quality of the product.

[0028] 2. Furthermore, a device to prevent welding shrinkage is designed on the welding fixture, which can resist welding shrinkage during welding and reduce deformation of parts during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 It is a schematic diagram of welding of a longitudinal beam outer plate and a longitudinal beam inner plate in the prior art;

[0031] Figure 2 It is a schematic diagram of the structure of a longitudinal beam welding fixture in the prior art;

[0032] Figure 3 A top view of the gantry type longitudinal beam welding fixture device structure described in the first embodiment;

[0033] Figure 4 It is a front view of the structure of the gantry type longitudinal beam welding fixture device described in the first embodiment.

[0034] The figure shows:

[0035] Side pressure mechanism (1 / 2 / 3 / 4 / 5 / 6)

[0036] Limiting devices at both ends of the longitudinal beam (7 / 10)

[0037] Positioning telescopic pin (8)

[0038] Anti-retraction drive cylinder (9)

[0039] Positive pressure slide mechanism (11 / 12)

[0040] Slide locking device (13 / 14)

[0041] Positive pressure drive mechanism (101 / 102)

[0042] Pre-loading device for parts (15 / 16)

[0043] Clamp support (17 / 18)

[0044] Positive pressure beam (19)

[0045] Positive pressure block (20)

[0046] Longitudinal beam inner plate (21)

[0047] Longitudinal beam outer plate (22)

[0048] Slide mechanism (23) DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0051] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In addition, all directional indications in this application (such as up, down, left, right, front, back, bottom...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions involving "first", "second", etc. in the application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0052] First Embodiment

[0053] As shown in the figure, this embodiment provides a gantry-type longitudinal beam welding fixture device for welding a longitudinal beam inner plate (21) and a longitudinal beam outer plate (22) into a longitudinal beam assembly. The device separates the positive pressure and side pressure mechanisms. When the device is used for welding, the positive pressure uses an overall clamping form driven by an electric cylinder, and the side pressure uses a cylinder clamping method, thereby avoiding interference between the welding gun and the positive pressure mechanism during operation, achieving continuous welding of the longitudinal beam weld. At the same time, the space at the welding position is larger, the welding posture is guaranteed, and the product welding quality is improved.

[0054] The gantry type welding fixture device mainly comprises the following components: a fixture support (17 / 18), a positioning and fixing device, a positive pressure mechanism and a plurality of side pressure mechanisms. The fixture support (17 / 18) is located on both sides of the entire fixture device, and the positive pressure mechanism is arranged on the fixture support (17 / 18). The plurality of side pressure mechanisms are symmetrically distributed on both sides of the assembly position of the longitudinal beam inner plate (21) and the longitudinal beam outer plate (22).

[0055] The positioning and fixing device includes a positioning telescopic pin (8) and a limiting device (7 / 10) at both ends of the longitudinal beam, which is used for positioning and fixing the longitudinal beam inner plate (21) and the longitudinal beam outer plate (22) during the assembly process. The positioning telescopic pin (8) is arranged at the assembly position of the longitudinal beam outer plate (22) and the longitudinal beam inner plate (21) in the welding fixture device, and is locked with the longitudinal beam inner plate (21) and the longitudinal beam outer plate (22) in turn through a telescopic action, so that the longitudinal beam inner and outer plates are positioned at the assembly position, ensuring that the longitudinal beam inner and outer plates are in the same position when buckled. The limiting devices (7 / 10) at both ends of the longitudinal beam are located on both sides of the open end of the longitudinal beam outer plate (22), and are provided with a limiting block and a driving cylinder. The limiting block can be pushed into the open end of the longitudinal beam outer plate (22) by the driving cylinder to prevent the workpiece from shifting during welding.

[0056] The positive pressure mechanism includes a positive pressure beam (19), a positive pressure slide mechanism (11 / 12), a slide locking device (13 / 14), and a positive pressure drive mechanism (101 / 102). The positive pressure slide mechanism (11 / 12) and the positive pressure drive mechanism (101 / 102) are both fixedly arranged on the clamp supports (17 / 18) at both ends. The positive pressure slide mechanism (11 / 12) and the positive pressure drive mechanism (101 / 102) are both connected to the positive pressure beam (19) and are respectively used to drive the positive pressure beam (19) to move in the horizontal and vertical directions. The two ends of the positive pressure beam (19) are respectively arranged on the positive pressure slide mechanism (11 / 12), and a plurality of positive pressure blocks (20) are arranged at the bottom thereof, which are used to apply uniform vertical clamping force to the longitudinal beam outer plate (22) and the longitudinal beam inner plate (21) to ensure stable fit of the workpiece during welding. The positive pressure slide mechanism (11 / 12) is arranged on the fixture support (17 / 18) and connected to the positive pressure beam (19), and is used to drive the positive pressure beam (19) to move horizontally to directly above the workpiece. The slide locking device (13 / 14) is arranged at the end of the positive pressure slide mechanism (11 / 12), and is used to lock the slide position to ensure the accurate positioning of the positive pressure beam (19). The positive pressure drive mechanism (101 / 102) is a drive electric cylinder, which is fixed on the fixture support (17 / 18) and connected to the positive pressure beam (19). The positive pressure beam (19) is controlled to move in the vertical direction by the drive electric cylinder, thereby providing it with precise clamping force and stroke control, and avoiding the rigid impact of the traditional cylinder.

[0057] Several side pressure mechanisms (1 / 2 / 3 / 4 / 5 / 6) are symmetrically distributed on both sides of the inner and outer plates of the longitudinal beam, and are divided into 6 front side pressure mechanisms (1 / 2 / 3) and 6 rear side pressure mechanisms (4 / 5 / 6). Each side pressure mechanism is provided with several side pressure blocks and driving cylinders. The side pressure blocks are fixed to the cylinder pressure arms through the connecting blocks with screws and pins. The cylinder drives the side pressure blocks to press the sides of the workpieces to prevent lateral displacement of the workpieces during welding and ensure the alignment of the welds.

[0058] In addition, the welding fixture also includes a pre-pressing device (15 / 16), which is arranged near the buckling area of ​​the inner and outer plates of the longitudinal beam, and is pushed out by the cylinder to temporarily press the inner and outer plates of the longitudinal beam to ensure that the two are tightly buckled, providing a basis for subsequent pressing.

[0059] The welding fixture also includes a device for preventing welding shrinkage, which includes a slide mechanism (23) and an anti-shrinkage drive cylinder (9), wherein the slide mechanism (23) is arranged on the rear section side pressure mechanism (4 / 5 / 6) and is linked thereto, and the anti-shrinkage drive cylinder (9) is connected to the slide mechanism (23) and is used to drive the slide mechanism (23) to drive the rear end side pressure mechanism (4 / 5 / 6) to move. When the positive pressure and the side pressure are completed, the anti-shrinkage drive cylinder (9) retracts, and a continuous pre-tension is applied to the rear section of the longitudinal beam assembly through the rear section side pressure mechanism (4 / 5 / 6) on the slide mechanism (23) to offset the welding shrinkage deformation.

[0060] When the above-mentioned gantry-type longitudinal beam welding fixture is working, the positive pressure mechanism and the side pressure mechanism work completely independently. The positive pressure mechanism drives the positive pressure beam and the positive pressure blocks thereon through the electric cylinder to positively press the parts; the side pressure mechanism is arranged on both sides of the parts, and drives the side pressure blocks through the side pressure cylinders to press the parts from both sides.

[0061] Second Embodiment

[0062] This embodiment provides a gantry type longitudinal beam welding method, which is implemented by using the gantry type longitudinal beam welding fixture device described in the first embodiment, and specifically includes the following steps:

[0063] Step S1. Manual assembly: Manually place the longitudinal beam outer plate (22) in the fixture and position it using the positioning telescopic pin (8). Use the cylinder to push the limit blocks on the limit devices (7 / 10) at both ends of the longitudinal beam into the openings at both ends of the longitudinal beam outer plate (22). Install the longitudinal beam inner plate (21) into the fixture, position it using the positioning telescopic pin, and buckle it with the longitudinal beam outer plate.

[0064] Step S2. Positive pressure: The positive pressure slide mechanism (11 / 12) moves the positive pressure beam (19) to the top of the workpiece of the buckled longitudinal beam inner plate (21) and longitudinal beam outer plate (22), and the slide locking device (13 / 14) confirms the position. The drive electric cylinder drives the positive pressure beam (19) down to the pre-installation position to initially press the workpiece.

[0065] Step S3: The cylinder of the component pre-pressing device (15 / 16) is pushed out to ensure that the longitudinal beam inner plate (21) and the longitudinal beam outer plate (22) are tightly fastened.

[0066] Step S4. Side pressure: The driving cylinders of the side pressure mechanism (1-6) are operated in sequence to press the side of the longitudinal beam workpiece in sections. The driving electric cylinder is pressed down to the working position for the second time, and the pre-pressing device (15 / 16) is retracted. When the positive pressure and side pressure are completed, the anti-shrinkage driving cylinder (9) is retracted, and the rear section side pressure mechanism (4 / 5 / 6) on the slide mechanism (23) applies continuous pre-tension to the rear section of the longitudinal beam assembly to offset the welding shrinkage deformation.

[0067] Step S5. The welding robot continuously welds along the longitudinal beam weld bead. Since the positive pressure beam (19) is designed to be separated from the side pressure mechanism, there is no interference with the welding gun, and the entire weld bead can be completed at one time.

[0068] Step S6. Reset and transfer: After welding is completed, the clamp is automatically opened, and the positive pressure beam (19) and the side pressure mechanism are reset.

[0069] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A gantry type longitudinal beam welding fixture device, used for welding a longitudinal beam outer plate and a longitudinal beam inner plate into a longitudinal beam assembly, characterized in that: The device comprises the following components: a fixture support, a positioning and fixing device, a positive pressure mechanism and a plurality of side pressure mechanisms; the fixture support is arranged on both sides of the entire fixture device, the positive pressure mechanism is arranged on the fixture support, and the plurality of side pressure mechanisms are symmetrically distributed on both sides of the assembly position of the longitudinal beam inner plate and the longitudinal beam outer plate; The positioning and fixing device includes a positioning telescopic pin and a limiting device at both ends of the longitudinal beam, which is used for positioning and fixing the longitudinal beam inner plate and the longitudinal beam outer plate during the assembly process; the positioning telescopic pin is arranged at the assembly position of the longitudinal beam outer plate and the longitudinal beam inner plate in the fixture; the limiting devices at both ends of the longitudinal beam are arranged on both sides of the open end of the longitudinal beam outer plate, and a limiting block is arranged thereon to prevent the workpiece from moving during the welding process; The positive pressure mechanism comprises a positive pressure beam, a positive pressure slide mechanism, a slide locking device and a positive pressure driving mechanism; wherein the positive pressure slide mechanism is fixed on the fixture supports on both sides and connected to the two ends of the positive pressure beam, and is used to drive the positive pressure beam to move horizontally to just above the workpiece; the positive pressure driving mechanism is a driving electric cylinder, which is fixed on the fixture support and connected to the two ends of the positive pressure beam, and is used to drive the positive pressure beam to move vertically above the workpiece; the slide locking device is arranged at the end of the positive pressure slide mechanism, and is used to lock the sliding position of the positive pressure slide mechanism; the positive pressure beam is arranged on the positive pressure slide mechanism, and can move in the horizontal direction along the positive pressure slide, and a plurality of positive pressure sliding blocks are also arranged on the positive pressure beam; The plurality of side pressure mechanisms are divided into a front side pressure mechanism and a rear side pressure mechanism, each of which is provided with a plurality of side pressure blocks and a driving cylinder, the driving cylinder driving the side pressure blocks to press the side of the workpiece to prevent the workpiece from lateral displacement during welding; When the gantry type longitudinal beam welding fixture is working, the positive pressure mechanism and the side pressure mechanism work independently. The positive pressure mechanism drives the positive pressure beam through the electric cylinder to positively press the parts; the side pressure mechanism drives the side pressure blocks through the side pressure cylinder to press the parts from both sides.

2. The gantry type longitudinal beam welding fixture device according to claim 1, characterized in that: The number of the side pressure mechanisms is 12, of which the number of the front end side pressure mechanisms is 6 and the number of the rear end side pressure mechanisms is 6.

3. The gantry type longitudinal beam welding fixture device according to claim 1, characterized in that: It also includes a component pre-pressing device, which is arranged in the buckling area of ​​the longitudinal beam inner plate and the longitudinal beam outer plate, and is used to temporarily press the longitudinal beam inner plate and the longitudinal beam outer plate to ensure that the two are tightly buckled.

4. The gantry type longitudinal beam welding fixture device according to claim 1, characterized in that: It also includes a device for preventing welding shrinkage, which is connected to the rear section side pressure mechanism and is used to apply continuous pre-tension to the rear section of the longitudinal beam assembly formed by buckling the longitudinal beam inner plate and the longitudinal beam outer plate to offset welding shrinkage deformation.

5. The gantry type longitudinal beam welding fixture device according to claim 4, characterized in that: The device for preventing welding shrinkage includes a slide mechanism and an anti-shrinkage driving cylinder, wherein the slide mechanism is arranged on the rear side pressure mechanism, and the anti-shrinkage driving cylinder is connected to the slide mechanism and is used to drive the slide mechanism to drive the rear side pressure mechanism to move; When the side pressure is completed, the anti-shrinkage driving cylinder retracts, and a continuous pre-tension is applied to the rear section of the longitudinal beam assembly through the rear section side pressure mechanism on the slide mechanism to offset the welding shrinkage deformation.

6. A gantry type longitudinal beam welding method, characterized in that: The gantry type longitudinal beam welding fixture device according to any one of claims 1 to 5 is implemented, comprising the following steps: Step S1. Manually place the longitudinal beam outer plate in the fixture and position it with the positioning telescopic pins, push the limit blocks on the limit devices at both ends of the longitudinal beam into the longitudinal beam outer plate; install the longitudinal beam inner plate into the fixture, position it with the positioning telescopic pins and buckle it with the longitudinal beam outer plate; Step S2. The positive pressure slide mechanism drives the positive pressure beam to move to the top of the workpiece, and the positive pressure drive mechanism drives the positive pressure beam down to the pre-installed position to initially press the workpiece; Step S3. The cylinder of the component pre-pressing device is pushed out to ensure that the inner plate of the longitudinal beam and the outer plate of the longitudinal beam are buckled; Step S4. The driving cylinders of the side pressure mechanism are operated in sequence to press the side of the workpiece in sections, the positive pressure driving mechanism drives the positive pressure beam to press down to the working position for the second time, and the pre-pressing device for the assembly is retracted; the rear side pressure mechanism applies pre-tension to the workpiece to resist welding deformation; Step S5. The welding robot continuously welds along the longitudinal beam weld; Step S6. After welding is completed, the positive pressure mechanism and the side pressure mechanism are reset.

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