Flat welding clamp for plate

Abstract

The utility model relates to the technical field of friction welding, in particular to a plate flat welding clamp which comprises a clamp bottom plate, a fixing blocking strip and a fastening device, the lower portion of the clamp bottom plate is installed on an operation platform of friction welding equipment, and the fixing blocking strip and the fastening device are installed on the upper portion of the clamp bottom plate. The two sets of fixing blocking strips are fixedly connected to the two adjacent side edges of the clamp bottom plate respectively, the two sets of fastening devices are fixedly connected to the other two adjacent side edges of the clamp bottom plate respectively, and the fixing blocking strips and the fastening devices are matched with each other and abut against the peripheral side walls of a to-be-welded workpiece respectively, so that the to-be-welded workpiece is detachably fixed to the clamp bottom plate. In conclusion, the workpiece is rigidly abutted and fixed through the periphery, so that displacement is avoided; a unique fastening device is used for accurate adjustment; the movable baffle strip adapts to different sizes; the supporting back cushion is prevented from deformation; and the wedge abutting block fixes a special part, the welding stability and quality are comprehensively improved, the welding quality and efficiency of friction stir welding are improved, and good practical value is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of friction welding, and in particular to a flat welding fixture for plates. Background Technology

[0002] Friction stir welding is a solid-state joining technology. Its core process feature is the use of high-speed rotating welding head to generate heat through friction with the workpiece, causing localized plasticization of the materials being welded. During the welding process, the rotating welding head rotates at high speed while moving along the joint of the workpiece, squeezing the plasticized material from the front to the rear of the welding head, ultimately forming a dense weld.

[0003] In this welding process, precise positioning and rigid fixation of the workpiece are crucial. This is especially true in the field of butt welding of flat plates, where the workpieces to be welded are typically flat, and other plate-shaped or strip-shaped workpieces are often welded to their ends. This necessitates rigid fixation of the plate-shaped and strip-shaped workpieces. While traditional vacuum negative pressure adsorption fixation methods can conveniently adsorb and fix plate-shaped workpieces, they suffer from a significant deficiency in rigidity.

[0004] During the welding process, the high-speed rotation of the welding head in friction stir welding, along with the workpiece joint and relative movement with the workpiece, generates significant forces. Vacuum negative pressure adsorption struggles to provide sufficiently stable support, easily leading to workpiece displacement and severely impacting welding quality. This is especially true when the workpiece to be welded on one side of a plate-shaped workpiece is a strip-shaped workpiece, where the negative pressure adsorption area is small, further diminishing the fixing effect and failing to meet the stringent requirements for workpiece fixation in high-quality welding. Therefore, a more effective fixing method is urgently needed to solve this technical challenge. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] This utility model provides a flat welding fixture for plates, including a fixture base plate, fixing bars, and fastening devices. The lower part of the fixture base plate is installed on the working platform of the friction welding equipment, and the upper part of the fixture base plate is equipped with fixing bars and fastening devices. Two sets of fixing bars are respectively fixed to the adjacent two sides of the fixture base plate, and two sets of fastening devices are respectively fixed to the other two adjacent sides of the fixture base plate. The fixing bars and fastening devices cooperate with each other and abut against the four sides of the workpiece to be welded, thereby detachably fixing the workpiece to be welded to the fixture base plate.

[0007] Furthermore: The fastening device is equipped with a fastening frame, an active slider, a passive slider, and a fastening cylinder. The fastening frame and the fastening cylinder are respectively installed on the upper and lower parts of the fixture base plate. The active slider is slidably connected to the fastening frame and moves along its vertical direction; the passive slider is slidably connected to the fastening frame and moves along its horizontal direction; one end of the active slider is driven to the piston end of the fastening cylinder, and the other end is driven to the passive slider.

[0008] Furthermore: the active slider is provided with a first guide rail at the end away from the workpiece to be welded, and the fastening frame is provided with a first guide groove at the part corresponding to the first guide rail. The first guide rail is embedded in the first guide groove to form a sliding limiting connection.

[0009] Furthermore: the active slider is provided with a second guide rail at one end near the workpiece to be welded, and the passive slider is provided with a second guide groove at the part corresponding to the second guide rail. The second guide rail is embedded in the second guide groove to form a sliding limiting connection.

[0010] Furthermore: the passive slider is provided with a third guide groove perpendicular to the first guide groove on both sides, and the fastening frame is provided with a third guide rail corresponding to the third guide groove. The third guide rail is embedded in the third guide groove to form a sliding limiting connection.

[0011] Furthermore, the second guide rail is configured as an inclined guide rail, and the second guide groove is configured as an inclined guide groove, so that the vertically moving active slider can drive the passive slider to move horizontally.

[0012] Furthermore, it also includes movable baffles to fill the remaining space between the workpiece to be welded and the fastening device, thereby fixing workpieces of different sizes.

[0013] Furthermore, it also includes a support back pad for supporting the part of the workpiece to be welded.

[0014] Furthermore, it also includes wedge blocks for fixing specific parts of the workpiece.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. Fixing stops are set on the adjacent sides of the fixture base plate to abut against the adjacent side walls of the workpiece to be welded; fastening devices are set on the other adjacent sides of the fixture base plate, and the driving end of the fastening device abuts against the other adjacent side walls of the workpiece to be welded, thereby achieving rigid abutment of the four sides of the workpiece to be welded and ensuring that the workpiece to be welded is firmly fixed on the fixture base plate.

[0017] 2. The fastening device adopts a structure consisting of a fastening frame, an active slider, a passive slider, and a fastening cylinder. The fastening cylinder drives the active slider to move vertically. Through the cooperation of the inclined guide rail and the guide groove, the vertical motion is converted into the horizontal motion of the passive slider, thereby achieving the clamping and fixing of the side wall of the workpiece to be welded.

[0018] 3. The movable stop bar can fill the remaining space between the workpiece to be welded and the fastening device, thus enabling the fixing of workpieces of different sizes. The support back pad is used to support the part of the workpiece to be welded, preventing workpiece deformation. The wedge block is used to fix special parts of the workpiece (such as grooves or extensions), further enhancing the versatility and adaptability of the fixture.

[0019] With the above improvements, this utility model provides a plate flat welding fixture that fixes the workpiece by rigidly abutting it from all sides to prevent displacement; a unique fastening device for precise adjustment; movable stops to adapt to different sizes; a support back pad to prevent deformation; and wedge blocks to fix special parts, comprehensively improving welding stability and quality, and enhancing the welding quality and efficiency of friction stir welding, thus having good practical value.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of the clamp base plate and fastening device of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the movable stop bar and the fixed stop bar of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the plate-shaped workpiece and the strip-shaped workpiece of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the support back pad and the limiting groove of this utility model;

[0026] Figure 5 This is a schematic diagram of the limiting groove and wedge block of this utility model;

[0027] Figure 6This is a structural schematic diagram of a plate-shaped workpiece and a strip-shaped workpiece of another size according to this utility model;

[0028] Figure 7 This is a structural schematic diagram of the fastening device of this utility model;

[0029] Figure 8 This is a cross-sectional schematic diagram of the fastening device, the active slider, and the passive slider of this utility model;

[0030] Figure 9 This is a structural schematic diagram of the active slider and passive slider of this utility model in a separated state.

[0031] The reference numerals and names in the figure are as follows:

[0032] 10 Fixture base plate; 11 Support frame; 12 Fixed stop bar; 13 Movable stop bar; 14 Support back pad; 15 Limiting groove; 16 Wedge block; 20 Fastening device; 21 Fastening cylinder; 22 Fastening frame; 23 First guide groove; 24 Third guide rail; 30 Active slider; 31 First guide rail; 32 Second guide rail; 40 Passive slider; 41 Second guide groove; 42 Third guide groove; 50 Workpiece to be welded; 51 Plate-shaped workpiece; 52 Strip-shaped workpiece. Detailed Implementation

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Please see Figures 1 to 9 In this embodiment of the present invention, a plate flat welding fixture includes a fixture base plate 10, fixing bars 12, and fastening devices 20. The lower part of the fixture base plate 10 is installed on the working platform of the friction welding equipment, and the upper part of the fixture base plate 10 is equipped with fixing bars 12 and fastening devices 20. Two sets of fixing bars 12 are respectively fixed to the adjacent two sides of the fixture base plate 10, and two sets of fastening devices 20 are respectively fixed to the other two adjacent sides of the fixture base plate 10. The fixing bars 12 and fastening devices 20 cooperate with each other and abut against the four sides of the workpiece 50 to be welded, thereby detachably fixing the workpiece 50 to the fixture base plate 10.

[0035] Specifically, friction stir welding refers to the use of heat generated by the friction between a high-speed rotating welding tool and the workpiece to locally melt the materials to be welded. As the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding tool under the action of the rotational friction force of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool.

[0036] Therefore, during the welding process, the workpiece 50 to be welded needs to be rigidly fixed on the fixture base plate 10, while the welding head rotates at high speed and moves relative to the workpiece along the joint. Especially in the operation of butt welding of flat plates, the workpiece 50 to be welded is usually flat, and other plate-shaped or strip-shaped workpieces need to be welded to its ends. The plate-shaped workpiece 51 and the strip-shaped workpiece 52 need to be rigidly fixed together.

[0037] While traditional vacuum negative pressure adsorption can conveniently hold plate-shaped workpieces 51 in place, its rigidity is insufficient, and displacement may occur during welding, affecting welding quality. This is especially true when the workpiece 50 to be welded on one side of the plate-shaped workpiece 51 is a strip-shaped workpiece 52, resulting in a smaller negative pressure adsorption area and even less secure fixation. Therefore, improvement is necessary.

[0038] Therefore, this patent provides fixing strips 12, which are fixed to the upper part of the fixture base plate 10, on the edge portions of adjacent sides of the fixture base plate 10, thereby abutting against the side walls of the workpiece 50 on adjacent sides. Simultaneously, fastening devices 20, fixed to the upper part of the fixture base plate 10, are provided on the other two edge portions of adjacent sides of the fixture base plate 10, allowing the driving end of the fastening device 20 to abut against the other two side walls of the workpiece 50 on adjacent sides. This provides rigid abutment against the workpiece 50 on all four sides, rigidly fixing the workpiece 50 to the fixture base plate 10, facilitating subsequent friction stir welding operations.

[0039] In addition, to form the above structure, preferably, the longitudinal shape of the fixture base plate 10 is set as a quadrilateral, so that corresponding fixing bars 12 or fastening devices 20 can be installed on its four sides respectively. A support frame 11 can also be provided at the lower part of the fixture base plate 10 for fixing the fixture base plate 10 to the working platform of the friction welding equipment.

[0040] like Figure 7 As shown, preferably, the fastening device 20 includes a fastening frame 22, an active slider 30, a passive slider 40, and a fastening cylinder 21. The fastening frame 22 and the fastening cylinder 21 are respectively installed on the upper and lower parts of the fixture base plate 10. The active slider 30 is slidably connected to the fastening frame 22 and moves along its vertical direction. The passive slider 40 is slidably connected to the fastening frame 22 and moves along its horizontal direction. One end of the active slider 30 is driven to the piston end of the fastening cylinder 21, and the other end is driven to the passive slider 40.

[0041] Specifically, the fastening frame 22 is fixedly installed on the upper part of the fixture base plate 10, corresponding to the position abutting against the side wall of the workpiece 50 to be welded. The fastening cylinder 21 is preferably installed on the lower part of the fixture base plate 10, corresponding to the lower part of the fastening frame 22, so that the piston rod of the fastening cylinder 21 can be driven to the active slider 30, driving the active slider 30 to move vertically. The active slider 30 and the passive slider 40 cooperate to form a transmission connection. The movement of the active slider 30 can drive the passive slider 40 to move horizontally, thereby abutting against the side wall of the workpiece 50 to be welded, achieving rigid fixation.

[0042] like Figures 7 to 9 As shown, preferably, the active slider 30 is provided with a first guide rail 31 at the end away from the workpiece 50 to be welded, and the fastening frame 22 is provided with a first guide groove 23 at the part corresponding to the first guide rail 31. The first guide rail 31 is embedded in the first guide groove 23 to form a sliding limiting connection.

[0043] Specifically, in order to guide and restrict the vertical movement of the active slider 30, preferably, a first guide groove 23 is provided on the side of the fastening frame 22 away from the workpiece 50 to be welded, and a first guide rail 31 is provided on the part of the active slider 30 corresponding to the first guide groove 23. The first guide rail 31 and the first guide groove 23 cooperate with each other to form a linear motion module with a limiting function, so that the active slider 30 can move linearly along the vertical direction of the fastening frame 22.

[0044] like Figures 7 to 9 As shown, preferably, the active slider 30 has a second guide rail 32 at one end near the workpiece 50 to be welded, and the passive slider 40 has a second guide groove 41 at the part corresponding to the second guide rail 32. The second guide rail 32 is embedded in the second guide groove 41 to form a slidable limiting connection.

[0045] Specifically, since the active slider 30 is connected to the passive slider 40, it can drive the passive slider 40 to move in the horizontal direction. In order to make the movement of the passive slider 40 more stable and accurate, a second guide rail 32 and a second guide groove 41 can be set to cooperate to form a sliding connection with a limiting function.

[0046] like Figures 7 to 9 As shown, preferably, the passive slider 40 has a third guide groove 42 perpendicular to the first guide groove 23 on both sides, and the fastening frame 22 has a third guide rail 24 corresponding to the third guide groove 42. The third guide rail 24 is embedded in the third guide groove 42 to form a sliding limiting connection.

[0047] Specifically, the third guide rail 24 is preferably provided in two sets, respectively set on two parts of the fastening frame 22 on both sides of the passive slider 40. It can be fixed to the fastening frame 22 by bolt connection to form a horizontal guide rail. The third guide groove 42 of the passive slider 40 can be fitted onto the third guide rail 24, and guided by the third guide rail 24, the passive slider 40 can only move in the horizontal direction, that is, it can abut or release the workpiece 50 to be welded in the horizontal direction.

[0048] like Figures 8 to 9 As shown, preferably, the second guide rail 32 is configured as an inclined guide rail and the second guide groove 41 is configured as an inclined guide groove, so that the vertically moving active slider 30 can drive the passive slider 40 to move horizontally.

[0049] Specifically, the inclined guide rail and the inclined guide groove cooperate to form an inclined plane transmission mechanism, which enables the active slider 30, which moves vertically, to drive the passive slider 40 to move horizontally.

[0050] like Figures 1 to 3 As shown, preferably, it also includes a movable stop bar 13 for filling the remaining space between the workpiece 50 to be welded and the fastening device 20, thereby fixing the workpiece 50 of different sizes to be welded.

[0051] Specifically, in actual welding operations, the dimensions of the workpiece 50 to be welded are usually varied, with different batches of workpieces 50 having different dimensions. However, the passive slider 40 of the fastening device 20 has a limited range of movement and cannot be adjusted over a large distance. Therefore, a movable stop bar 13 can be placed in the remaining space to fill the gap. The passive slider 40 can move a small distance to abut against the movable stop bar 13, thereby fixing the workpiece 50 to be welded. Preferably, the movable stop bar 13 is provided in various sizes and specifications, so that they can abut against each other and combine to fill the remaining space. Figure 6 As shown, for workpieces 50 of different sizes to be welded, different numbers or thicknesses of movable retaining strips 13 can be used for auxiliary filling so that they can be firmly and rigidly fixed on the fixture base plate 10.

[0052] like Figures 4 to 6 As shown, preferably, it also includes a support back pad 14 for supporting the part of the workpiece to be welded.

[0053] Specifically, multiple support back pads 14 can be set. Support back pads 14 can be placed under the part of the workpiece that needs to be welded to support the workpiece and help the workpiece withstand the pressure of the stir welding head, so as to prevent the workpiece from deforming.

[0054] like Figures 4 to 5As shown, preferably, it also includes a wedge block 16 for fixing specific parts of the workpiece.

[0055] Specifically, some workpieces have grooves or extended sections on their sides, making it difficult for ordinary movable retaining bars 13 to align, fix, and support them. Therefore, wedge blocks 16 can be provided to abut against these special sections. To further assist in positioning the wedge blocks 16, a limiting groove 15 can be provided on the support back pad 14, allowing the protruding part of the wedge blocks 16 to embed into the limiting groove 15, thereby assisting the wedge blocks 16 in fixing the workpiece.

[0056] After the above optimizations and improvements, this patented technology can achieve the following technical effects:

[0057] Fixed baffles 12 and fastening devices 20: Fixed baffles 12 are provided on the adjacent two sides of the fixture base plate 10, and fastening devices 20 are provided on the other two sides to achieve rigid contact on all four sides.

[0058] Inclined guide rail and guide groove: The vertical motion is converted into horizontal motion by the cooperation of the inclined guide rail and guide groove, so as to clamp and fix the workpiece.

[0059] Movable stop bar 13 and support back pad 14: The movable stop bar 13 and support back pad 14 are introduced to adapt to workpieces of different sizes and provide auxiliary support to prevent workpiece deformation.

[0060] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A plate flat welding fixture, characterized in that, The fixture includes a base plate (10), fixed stops (12), and fastening devices (20). The lower part of the base plate (10) is installed on the working platform of the friction welding equipment. The upper part of the base plate (10) is equipped with fixed stops (12) and fastening devices (20). Two sets of fixed stops (12) are fixed to the adjacent two sides of the base plate (10), and two sets of fastening devices (20) are fixed to the other two sides of the base plate (10). The fixed stops (12) and fastening devices (20) cooperate with each other and abut against the four sides of the workpiece (50) to be welded, thereby detachably fixing the workpiece (50) to the base plate (10).

2. The plate flat welding fixture according to claim 1, characterized in that, The fastening device (20) is provided with a fastening frame (22), an active slider (30), a passive slider (40), and a fastening cylinder (21). The fastening frame (22) and the fastening cylinder (21) are respectively installed on the upper and lower parts of the fixture base plate (10). The active slider (30) is slidably connected to the fastening frame (22) and moves along its vertical direction. The passive slider (40) is slidably connected to the fastening frame (22) and moves along its horizontal direction. One end of the active slider (30) is driven to the piston end of the fastening cylinder (21), and the other end is driven to the passive slider (40).

3. A plate flat welding fixture according to claim 2, characterized in that, The active slider (30) is provided with a first guide rail (31) at one end away from the workpiece (50) to be welded. The fastening frame (22) is provided with a first guide groove (23) at the part corresponding to the first guide rail (31). The first guide rail (31) is embedded in the first guide groove (23) to form a sliding limiting connection.

4. A plate flat welding fixture according to claim 3, characterized in that, The active slider (30) has a second guide rail (32) at one end near the workpiece (50) to be welded, and the passive slider (40) has a second guide groove (41) at the part corresponding to the second guide rail (32). The second guide rail (32) is embedded in the second guide groove (41) to form a sliding limiting connection.

5. A plate flat welding fixture according to claim 4, characterized in that, The passive slider (40) has a third guide groove (42) perpendicular to the first guide groove (23) on both sides. The fastening frame (22) has a third guide rail (24) corresponding to the third guide groove (42). The third guide rail (24) is embedded in the third guide groove (42) to form a sliding limiting connection.

6. A plate flat welding fixture according to claim 4, characterized in that, The second guide rail (32) is set as an inclined guide rail, and the second guide groove (41) is set as an inclined guide groove, so that the active slider (30) moving in the vertical direction can drive the passive slider (40) to move in the horizontal direction.

7. A plate flat welding fixture according to claim 1, characterized in that, It also includes a movable stop bar (13) for filling the remaining space between the workpiece to be welded (50) and the fastening device (20), thereby fixing the workpieces (50) of different sizes.

8. A plate flat welding fixture according to claim 1, characterized in that, It also includes a support back pad (14) for supporting the part of the workpiece to be welded.

9. A plate flat welding fixture according to claim 1, characterized in that, It also includes a wedge block (16) for fixing specific parts of the workpiece.

Images