Aluminum alloy friction stir welding tooling

Abstract

The utility model relates to the technical field of friction welding frock, and disclose an aluminium alloy friction stir welding frock through setting up bearing device, support oil jar, bearing plate and so on structure realizes the quick heat dissipation to work piece while adjusting height, places work piece in bearing plate after, installs corresponding pressure bar at corresponding position, starts support oil jar subsequently, and support oil jar drives the top head and bearing plate to jacking or contraction through output shaft, realizes self -adaptation adjustment, makes work piece and pressure bar located height position just can be clamped steady and hold up the pressure bar of corresponding position, the heat dissipation hole that is set up on the surface of bearing plate, when welding between work piece, can quickly dissipate the heat that work piece interior because of welding brings quickly, avoids the deformation of work piece because of the temperature too high outside processing, also avoids the misplacement of work piece because of thermal expansion and cold shrink, has played the effect of adjusting height, quick heat dissipation.

Description

Technical Field

[0001] This utility model relates to the field of friction welding fixtures, and in particular to an aluminum alloy friction stir welding fixture. Background Technology

[0002] Aluminum alloys, which are aluminum-based alloys with a certain amount of other alloying elements, are one of the light metal materials. In the welding process of aluminum alloys, friction stir welding is commonly used. 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 back 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. Before welding aluminum alloy sheets, tooling is needed to position and clamp the workpiece to avoid displacement of the workpiece during the welding process and to ensure precise alignment of the joint.

[0003] In the existing technology, there are certain shortcomings in the clamping and support fixtures for workpieces. For example, conventional support fixtures with grooves of a specific size cannot be adapted to workpieces of the same size but different heights. They cannot achieve stable clamping when used in conjunction with clamping operations. For workpiece clamping fixtures, the response speed of hydraulic cylinders alone is too slow to achieve rapid response. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an aluminum alloy friction stir welding fixture, which has the advantages of stable adjustment and stable clamping, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: an aluminum alloy friction stir welding fixture, including a base plate, a pad fixedly installed on the top of the base plate, a bearing device installed inside the pad, a workpiece placed on the top of the bearing device, pressure strips symmetrically and movably installed at the corners of the workpiece, the inner corners of the pressure strips engaging with the outer corners of the workpiece, and clamps uniformly fixedly installed on the top of the base plate at the outer ring of the pad.

[0006] With the above structural setup, the workpiece is flexibly supported by the load-bearing device. After the workpiece is placed on top of the load-bearing plate, the support cylinder is activated. The support cylinder controls the output shaft to lift the load-bearing plate upward through the top head.

[0007] Preferably, the bearing device includes a support cylinder, a top head, and a bearing plate. The support cylinder is symmetrically and fixedly installed inside the pad. The top of the output shaft of the support cylinder is provided with a top head, and the top of the top head is provided with a bearing plate. The top head is symmetrically located at the bottom of the bearing plate, and heat dissipation holes are evenly opened on the surface of the bearing plate.

[0008] With the above structural design, the bearing device controls the lifting and retraction of the mandrel through the support cylinder during use, thereby controlling the vertical position of the workpiece. When processing and welding a thicker workpiece, the support cylinder drives the mandrel and bearing plate to retract downwards through the output shaft.

[0009] Preferably, the clamp includes a pad and a rotary pressing cylinder. The pad is evenly installed on the top of the base plate and around the base plate. The rotary pressing cylinder is fixedly installed on the top of the pad. A pressure plate is fixedly sleeved on the outer ring of the output shaft of the rotary pressing cylinder. A pressure head is installed at the end of the pressure plate.

[0010] With the above structural design, lever cylinders can be installed alternately in the gaps of the fixture. Through the cooperation between the lever cylinders and the fixture, the tooling clamping of the workpiece can be made more stable. During the operation, the fixture presses and squeezes the workpiece and the pressure bar through the pressure head, thereby fixing the position of the workpiece.

[0011] Preferably, the pressure head includes a silicone head and a threaded rod. The threaded rod is threadedly installed inside the pressure plate, and the threads of the threaded rod and the pressure plate are compatible. The silicone head is located at the bottom of the threaded rod and is fixedly connected to the threaded rod. The end face of the silicone head is in contact with the top surface of the pressure strip.

[0012] With the above structural design, the pressure head can be adjusted in height to accommodate workpieces of different thicknesses or heights during use. By adjusting the rotational position of the threaded rod inside the pressure plate, the vertical position of the silicone head can be changed.

[0013] This utility model has the following advantages:

[0014] 1. This aluminum alloy friction stir welding fixture, through the setting of a bearing device, a support cylinder, and a bearing plate, achieves height adjustment while rapidly dissipating heat from the workpiece. After the workpiece is placed on the bearing plate, the corresponding pressure bar is installed at the corresponding position. Then, the support cylinder is activated. The support cylinder drives the top head and the bearing plate to lift or retract through the output shaft, achieving adaptive adjustment so that the height position of the workpiece and the pressure bar is just right for the fixture to stably clamp and press the corresponding pressure bar. Through the heat dissipation holes opened on the surface of the bearing plate, the heat generated by welding can be quickly dissipated from the inside of the workpiece during welding, avoiding deformation of the workpiece due to excessive temperature and misalignment caused by thermal expansion and contraction. It achieves the effects of height adjustment and rapid heat dissipation.

[0015] 2. This aluminum alloy friction stir welding fixture achieves workpiece positioning and clamping through the setting of pressure bars, rotary pressing cylinders, and pressing heads. In use, lever cylinders can be installed alternately in the gaps of the fixture. Through the cooperation of lever cylinders and fixtures, the fixture can make the workpiece clamping more stable. Compressed air is introduced into the rotary pressing cylinder, causing the output shaft of the rotary pressing cylinder to work quickly, driving the pressure plate to rotate and press down. The rotation stroke is before the pressing stroke, so it will not cause damage to the workpiece during rotation. The rotary pressing cylinder drives the pressure plate and pressing head to rotate and press down synchronously. Then the pressing head presses against the surface of the pressure bar, thereby fixing the position of the workpiece. The setting of the pressure bar avoids damage caused by the clamping between the pressing head and the workpiece during the clamping process, and achieves the effect of positioning and clamping the workpiece. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present utility model;

[0018] Figure 3 This is an exploded view of the overall structure of this utility model;

[0019] Figure 4 This is an exploded cross-sectional view of the structure of the bearing device of this utility model.

[0020] In the diagram: 1. Base plate; 2. Pad plate; 3. Bearing device; 31. Support cylinder; 32. Top head; 33. Bearing plate; 4. Workpiece; 5. Pressure bar; 6. Fixture; 61. Pad block; 62. Rotary pressing cylinder; 63. Pressure plate; 64. Press head. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-3 A friction stir welding fixture for aluminum alloy includes a base plate 1, a pad 2 fixedly installed on the top of the base plate 1, a bearing device 3 installed inside the pad 2, a workpiece 4 placed on the top of the bearing device 3, pressure strips 5 symmetrically and movably installed at the corners of the workpiece 4, the inner corners of the pressure strips 5 engaging with the outer corners of the workpiece 4, and clamps 6 uniformly fixedly installed on the top of the base plate 1 at the outer ring of the pad 2.

[0023] In practical applications, this device flexibly supports the workpiece 4 by setting up the bearing device 3. After the workpiece 4 is placed on top of the bearing plate 33, the support cylinder 31 is activated. The support cylinder 31 controls the output shaft to lift the bearing plate 33 upward through the top head 32. Then it continues to move, placing the upper surface of the workpiece 4 in the position held by the fixture 6, thus flexibly controlling the lifting of the workpiece 4.

[0024] Furthermore, the support plate 33 can play a certain heat dissipation role in the welding between the workpieces 4. Through the heat dissipation holes opened on the surface of the support plate 33, the heat generated by welding can be quickly dissipated from the inside of the workpieces 4 during welding, avoiding deformation of the workpieces due to excessive temperature, and also avoiding misalignment of the workpieces due to thermal expansion and contraction.

[0025] In practical use, the pressure strip 5 can achieve different effects for welding at different angles. When welding workpieces 4 on top of each other, the pressure strip 5 is pressed on the corner of the lower workpiece 4 to fix the position of the bottom workpiece 4. When clamping workpieces 4 to be welded on both sides, the two pressure strips 5 are placed on the corners of different workpieces 4 respectively, so that there is enough gap between the pressure strips 5 for welding, so that the pressure strip 5 can stabilize the position of the workpiece 4 during welding.

[0026] Please see Figures 1-4 The bearing device 3 includes a support cylinder 31, a top head 32, and a bearing plate 33. The support cylinder 31 is symmetrically fixedly installed inside the pad plate 2. The top head 32 is provided on the top of the output shaft of the support cylinder 31. The top head 32 is provided on the top of the top head 32. The top head 32 is symmetrically located at the bottom of the bearing plate 33. The surface of the bearing plate 33 is uniformly provided with heat dissipation holes.

[0027] In use, the support cylinder 3 controls the lifting and retraction of the top head 32 through the support cylinder 31 to control the vertical position of the workpiece 4. When processing and welding a thicker workpiece 4, the support cylinder 31 drives the top head 32 and the support plate 33 to retract downward through the output shaft, so that the top surface of the workpiece 4 is equal to the clamping height of the fixture 6, which facilitates subsequent clamping and welding with the workpiece 4. When processing a thinner workpiece 4, the output shaft of the support cylinder 31 should be controlled to drive the top head 32, the support plate 33 and the workpiece 4 to lift upward together to adjust the position of workpieces of different thicknesses.

[0028] Please see Figures 1-4 The fixture 6 includes a pad 61 and a rotary pressing cylinder 62. The pad 61 is evenly installed on the top of the base plate 1 and is located around the pad plate 2. The rotary pressing cylinder 62 is fixedly installed on the top of the pad 61. The outer ring of the output shaft of the rotary pressing cylinder 62 is fixedly sleeved with a pressure plate 63. A pressure head 64 is installed at the end of the pressure plate 63.

[0029] In practical use, lever cylinders can be installed alternately in the gap of clamp 6. Through the cooperation between lever cylinders and clamp 6, the tooling clamping of workpiece 4 can be made more stable. After the adaptation adjustment between bearing device 3 and workpiece 4 is completed, pressure bar 5 is placed at the corner of workpiece 4 so that the inner corner of pressure bar 5 is engaged with the outer corner of workpiece 4. Compressed air is introduced into rotary pressing cylinder 62, so that rotary pressing cylinder 62 drives the output shaft to work quickly, driving pressure plate 63 to rotate and press down. The rotation stroke is before the pressing stroke, so it will not cause damage to workpiece 4 during rotation. Through rotary pressing cylinder 62, pressure plate 63 and pressure head 64 are driven to rotate and press down synchronously. Then pressure head 64 presses on the surface of pressure bar 5 to fix the position of workpiece 4. Through the setting of pressure bar 5, the clamping between pressure head 64 and workpiece 4 is avoided during the clamping process. Pressure bar 5 can play the advantages of clamping buffer and avoiding damage.

[0030] After the lever cylinders are staggered in this device, the lever cylinders are started to work after the pressure head 64 stably clamps the pressure bar 5 and the workpiece 4. They work together with the rotating pressing cylinder 62 to achieve more stable clamping of the workpiece 4.

[0031] Please see Figures 1-4 The pressure head 64 includes a silicone head and a threaded rod. The threaded rod is threadedly installed inside the pressure plate 63. The threads of the threaded rod and the pressure plate 63 are compatible. The silicone head is located at the bottom of the threaded rod and is fixedly connected to the threaded rod. The end face of the silicone head is in contact with the top surface of the pressure strip 5.

[0032] During use, the pressure head 64 can be adjusted in height to adapt to workpieces 4 of different thicknesses or heights. By adjusting the rotational position of the threaded rod inside the pressure plate 63, the vertical position of the silicone head can be changed. By adjusting the up and down position of the pressure head 64 inside the pressure plate 63, the silicone head can be adjusted to adapt to workpieces 4 of different thicknesses or heights. Furthermore, the silicone head design can prevent damage to the workpiece 4 or pressure strip 5 during the clamping process, thus achieving buffered clamping.

[0033] Working principle: When using, for workpieces 4 that are welded together, first place the lower workpiece 4 on the surface of the support plate 33, and then symmetrically clamp the pressure strips 5 at the corners of the lower workpiece 4 to avoid damage to the workpiece 4 during the clamping process. Then place the upper workpiece 4 in the middle of the lower workpiece 4.

[0034] For workpieces 4 that are welded on the left and right sides, first align the edges of workpieces 4 and place them on the top of the support plate 33. Then, clamp the pressure strips 5 at the corners of both workpieces 4 and leave enough gap between the pressure strips 5 for welding. Then, start the support cylinder 31. The support cylinder 31 drives the top head 32 and the support plate 33 to lift or retract through the output shaft to achieve adaptive adjustment so that the height of the pressure strips 5 can be stably clamped by the fixture 6.

[0035] After the height adjustment between the bearing device 3 and the workpiece 4 is completed, check whether the clamping between the pressure strip 5 and the workpiece 4 is closed. After the check is completed, start the rotary pressing cylinder 62. When the rotary pressing cylinder 62 is working, it drives the pressure plate 63 to rotate and press down. Since the rotation stroke and pressing stroke are short, the pressure strip 5 and the workpiece 4 will not be damaged when the pressure plate 63 rotates. When the pressure plate 63 drives the pressure head 64 to press down, the silicone head first contacts the surface of the pressure strip 5. After the stroke of the pressure plate 63 is completed, the silicone head steadily presses against the surface of the pressure strip 5, so as to achieve stable clamping of the workpiece 4 and the pressure strip 5.

Claims

1. An aluminium alloy friction stir welding tool comprising a base plate (1) characterised in that: A pad (2) is fixedly installed on the top of the base plate (1). A bearing device (3) is installed inside the pad (2). A workpiece (4) is placed on the top of the bearing device (3). Pressure strips (5) are symmetrically and movably installed at the corners of the workpiece (4). The inner corner of the pressure strip (5) is engaged with the outer corner of the workpiece (4). A clamp (6) is uniformly fixedly installed on the top of the base plate (1) on the outer ring of the pad (2).

2. An aluminum alloy friction stir welding tool according to claim 1, wherein: The bearing device (3) includes a support cylinder (31), a top head (32), and a bearing plate (33). The support cylinder (31) is symmetrically fixed inside the pad (2). The top head (32) is provided on the top of the output shaft of the support cylinder (31). The top head (32) is provided on the top of the top head (32). The top head (32) is symmetrically located at the bottom of the bearing plate (33). The surface of the bearing plate (33) is uniformly provided with heat dissipation holes.

3. An aluminum alloy friction stir welding tool according to claim 2, wherein: The clamp (6) includes a pad (61) and a rotary pressing cylinder (62). The pad (61) is evenly installed on the top of the base plate (1) and is located around the pad plate (2). The rotary pressing cylinder (62) is fixedly installed on the top of the pad (61). The outer ring of the output shaft of the rotary pressing cylinder (62) is fixedly sleeved with a pressure plate (63). The end of the pressure plate (63) is equipped with a pressure head (64).

4. An aluminum alloy friction stir welding tool according to claim 3, wherein: The pressure head (64) includes a silicone head and a threaded rod. The threaded rod is threadedly installed inside the pressure plate (63). The threaded rod and the pressure plate (63) are threadedly matched. The silicone head is located at the bottom of the threaded rod and is fixedly connected to the threaded rod. The end face of the silicone head is in contact with the top surface of the pressure strip (5).

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