Jig for friction stir welding

Abstract

The jig comprises a base plate, a push block and at least two OK clamps, a welding groove composed of a welding cavity, a push block cavity and a plurality of locking cavities is formed in the base plate, installation holes are formed in the four corners of the base plate, a part to be welded is placed in the welding cavity, the push block is movably connected into the push block cavity, and the OK clamps are connected with the push block. The at least two OK clamps are detachably connected in the locking cavity, and the push blocks of the OK clamps are in contact with the OK clamps and the to-be-welded part respectively; the push block and the OK clamp are used in cooperation to replace a wedge block in a traditional fixing mode, and the mode has the advantages that when the OK clamp fixes the to-be-welded part through the push block, and when the to-be-welded part shrinks inwards due to high temperature in the welding process, it is guaranteed that the to-be-welded part does not shake through the mode that the inner extrusion force of the OK clamp is released.

Description

TECHNICAL FIELD

[0001] The utility model relates to a friction welding technical field, especially a jig for friction stir welding. BACKGROUND

[0002] Friction welding as a solid phase connection process, this connection process is applied in the connection of aluminum alloy, magnesium alloy and other metals, and it mainly utilizes the heat generated by the friction between the high-speed rotating welding tool and the workpiece to make the workpiece to be welded melt, when the welding tool moves along the welding interface, the plasticized material forms a dense solid phase welding seam under the rotating friction force and extrusion of the welding tool;

[0003] Since the workpiece to be welded does not have a through hole for fixing, most of the time, the wedge 5 is used to assist in fixing the workpiece to be welded 6, as shown in the attached Figure 1 The contact between the wedge 5 and the workpiece to be welded 6 forms extrusion on the workpiece to be welded 2, thereby achieving the purpose of limiting the workpiece to be welded 6, but during the welding process, the contact between the welding tool and the workpiece is in a high temperature state, in which state the workpiece to be welded 6 will shrink, and then a gap will be generated between the workpiece to be welded 6 and the wedge 5, resulting in the workpiece to be welded 6 shaking;

[0004] Therefore, there is an urgent need for a jig for friction stir welding to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a jig for friction stir welding of titanium-aluminum alloy to solve the above problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a jig for friction stir welding, comprising:

[0007] A base plate, a push block and at least two OK clamps are provided, the base plate is provided with a welding groove composed of a welding cavity, a push block cavity and a plurality of locking cavities, and the four corners of the base plate are provided with mounting holes, the workpiece to be welded is placed in the welding cavity, the push block is movably connected in the push block cavity, and the at least two OK clamps are detachably connected in the locking cavities, and the push block is in contact with the OK clamps and the workpiece to be welded.

[0008] Preferably, a plurality of first threaded holes are arranged on the push block cavity, and a plurality of waist-shaped holes matched with the first threaded holes are arranged on the push block.

[0009] Preferably, a plurality of second threaded holes are arranged on the locking cavities, and a plurality of second through holes matched with the second threaded holes are arranged on the OK clamps.

[0010] Preferably, an inner recessed notch matched with the OK clamp is arranged on the side wall of the contact side of the push block and the OK clamp.

[0011] Preferably, a discharging through hole is arranged at the middle position of the welding cavity.

[0012] Preferably, the pushing block is provided with at least two groups, and the at least two groups of pushing blocks are respectively in transverse and longitudinal contact with the to-be-welded member.

[0013] Preferably, the OK clamps are provided in plurality, the number of which is matched with the pushing blocks, and the pushing blocks are in contact with at least the bottom wall of the OK clamps.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The to-be-welded member is fixed through the cooperation of the pushing block and the OK clamp, and the OK clamp is used to fix the to-be-welded member through the pushing block, so that when the to-be-welded member is internally contracted due to high temperature in the welding process, the OK clamp can ensure that the to-be-welded member does not shake through the internal extrusion force release. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a sectional structure schematic view of a wedge block in the background art;

[0017] Figure 2 It is a structural schematic view of a jig for friction stir welding;

[0018] Figure 3 It is a sectional structure schematic view of a welding groove in the first embodiment of the utility model;

[0019] Figure 4 It is a structural schematic view of a base plate in the second embodiment of the utility model;

[0020] Figure 5 It is a sectional structure schematic view of a mounting groove in the second embodiment of the utility model;

[0021] Figure 6 It is a structural schematic view of a pushing block in the second embodiment of the utility model.

[0022] In the drawing: 1, base plate; 10, welding cavity; 11, pushing block cavity; 110, first threaded hole; 12, locking cavity; 120, second threaded hole; 13, mounting hole; 14, welding groove; 2, to-be-welded member; 3, pushing block; 30, waist-shaped hole; 32, inner recessed notch; 4, OK clamp; 40, second through hole; 5, wedge block; 6, to-be-welded block. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to 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 the embodiments.

[0024] Embodiment one

[0025] Please refer to the drawingsFigures 2-3 A jig for friction stir welding, comprising:

[0026] The base plate 1, the push block 3 and at least two OK clamps 4, the base plate 1 is provided with a welding groove 14 composed of a welding cavity 10, a push block cavity 11 and a plurality of locking cavities 12, and the base plate 1 is provided with mounting holes 13 at four corners, the welding cavity 10 is placed with a to-be-welded part 2, the push block 3 is movably connected in the push block cavity 11, and at least two OK clamps 4 are detachably connected in the locking cavities 12, and the push block 3 is in contact with the OK clamp 4 and the to-be-welded part 2 respectively; First of all, it needs to be noted that the to-be-welded part 2 usually includes at least two independent parts, such as the welding of the mobile phone shell in the actual application of the unit, the to-be-welded part 2 includes a plate body in the middle and a strip-shaped block around the plate body, and during the welding process of the to-be-welded part 2, due to high temperature, the to-be-welded part 2 shakes, which affects the welding quality, therefore, the OK clamp 4 is used to fix the to-be-welded part 2, considering that the OK clamp 4 is directly in contact with the to-be-welded part 2 to fix the to-be-welded part 2, there may be a problem that the to-be-welded part 2 leaves marks on the side wall due to uneven stress, therefore, the push block 3 is arranged between the OK clamp 4 and the to-be-welded part 2, which not only can evenly distribute the force applied by the OK clamp 4 on the side wall of the to-be-welded part 2 in contact with the push block 3, but also can avoid leaving marks on the to-be-welded part 2 by the OK clamp 4, and the actual application size of the OK clamp 4 can be finely adjusted according to the size of the to-be-welded part 2 after the OK clamp 4 is adjusted by the screw, and the screw used to adjust the OK clamp 4 is in a stressed state when the OK clamp 4 is locked, that is, the external force applied by the OK clamp 4 is greater than the force required for normal fixation of the to-be-welded part 2, when the to-be-welded part 2 shrinks during the welding process, the OK clamp 4 can adapt to the shrinkage of the to-be-welded part 2 by releasing the internal extrusion force, thereby avoiding the influence of the shrinkage of the to-be-welded part 2 on the welding quality.

[0027] Specifically, a plurality of first threaded holes 110 are arranged on the push block cavity 11, and a plurality of waist-shaped holes 30 matched with the first threaded holes 110 are arranged on the push block 3;

[0028] Specifically, the locking cavity 12 is provided with a plurality of second threaded holes 120, and the OK clamp 4 is provided with a plurality of second through holes 40 matched with the second threaded holes 120; considering that it is inconvenient to set a hole for fixing on the to-be-welded part 2, the first threaded hole 110 and the second threaded hole 120 are respectively arranged on the push block cavity 11 and the locking cavity 12, and the position of the push block 3 and the OK clamp 4 is limited by the waist-shaped hole 30 on the push block 3 and the second through hole 40 on the OK clamp 4, so that the OK clamp 4 cannot be positionally offset during the welding of the to-be-welded part 2, wherein the use of the waist-shaped hole 30 enables the push block 3 to have a certain displacement space, that is, when the to-be-welded part 2 is retracted, the push block 3 can be slightly displaced to ensure that the to-be-welded part 2 is still well fixed after retraction.

[0029] Meanwhile, in order to ensure that the OK clamp 4 is completely matched with the push block 3 during adjustment, the push block 3 is also moderately improved in shape, specifically, the side wall of the push block 3 in contact with the OK clamp 4 is provided with an inner recessed notch 32 matched with the OK clamp 4.

[0030] Considering that the to-be-welded part 2 may not be easily removed after welding, preparation for easily removing the to-be-welded part 2 is made in advance, specifically, a discharging through hole 100 is arranged at the middle position of the welding cavity 10, when the to-be-welded part 2 cannot be removed, the to-be-welded part 2 can be easily removed by pushing it through the discharging through hole 100 with an external object.

[0031] Embodiment two

[0032] Please refer to the accompanying drawings Figures 4-6

[0033] Considering that the to-be-welded part 2 gradually retracts along the welding track during welding, rather than simultaneously retracts along the entire welding track, the use of the integral push block 3 is likely to cause the push block 3 and the to-be-welded part 2 to fail to closely match during welding, and the to-be-welded part 2 may still shake, and considering that the retraction of the to-be-welded part 2 exists not only in the transverse direction, but also in the longitudinal direction, the push block 3 is further improved;

[0034] Specifically, the push block 3 is provided with at least two groups, and at least two groups of the push block 3 are respectively in transverse and longitudinal contact with the to-be-welded part 2;

[0035] Specifically, the OK clamps 4 are provided in plurality, the number of which matches the push blocks 3, and the push blocks 3 are in contact with at least the bottom wall of one of the OK clamps 4; the push blocks 3 are combined by multiple short plates, and each push block 3 is matched with at least one OK clamp 4, when the local shrinkage occurs during the welding process of the to-be-welded piece 2, the push block 3 and the OK clamp 4 corresponding to the shrinkage position can timely adhere to the to-be-welded piece 2 at the shrinkage position, so as to avoid the shaking of the to-be-welded piece 2.

[0036] Embodiment three

[0037] Considering that the shrinkage of the to-be-welded piece 2 is relatively slight, such as the to-be-welded piece 2 of the XX profile, the position of the push block 3 can be changed by the internal extrusion force of the OK clamp 4 itself to fill the gap between the to-be-welded piece 2 and the push block 3 due to the shrinkage, but when the shrinkage of the to-be-welded piece 2 is relatively serious, such as the to-be-welded piece 2 of the XX profile, in this case, the internal extrusion force of the OK clamp 4 itself cannot fill the gap between the to-be-welded piece 2 and the push block 3, in this case, the elastic gasket or spring can be placed on the second through hole 40 to solve the problem, and the elastic force of the elastic gasket or spring is used to adjust the OK clamp 4 in real time during the welding process of the to-be-welded piece 2.

[0038] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A fixture for friction stir welding, characterized in that, include: The substrate (1), push block (3) and at least two OK clips (4) are provided. The substrate (1) is provided with a welding groove (14) consisting of a welding cavity (10), a push block cavity (11) and multiple locking cavities (12). The substrate (1) is provided with mounting holes (13) at the four corners. The welding cavity (10) contains a workpiece (2) to be welded. The push block (3) is movably connected to the push block cavity (11). At least two OK clips (4) are detachably connected to the locking cavities (12). The push block (3) is in contact with the OK clip (4) and the workpiece (2) to be welded, respectively.

2. The fixture for friction stir welding according to claim 1, characterized in that: The push block cavity (11) is provided with a plurality of first threaded holes (110), and the push block (3) is provided with a plurality of waist-shaped holes (30) that match the first threaded holes (110).

3. The fixture for friction stir welding according to claim 1, characterized in that: The locking cavity (12) is provided with a plurality of second threaded holes (120), and the OK clip (4) is provided with a plurality of second through holes (40) that match the second threaded holes (120).

4. The fixture for friction stir welding according to claim 1, characterized in that: The push block (3) has a recessed notch (32) on the side wall that contacts the OK clip (4) to match the OK clip (4).

5. A fixture for friction stir welding according to claim 1, characterized in that: The welding cavity (10) is provided with a discharge through hole (100) in the middle position.

6. A fixture for friction stir welding according to claim 1, characterized in that: The pusher (3) is provided in at least two sets, and at least two sets of the pusher (3) are in contact with the workpiece (2) to be welded in the horizontal and vertical directions, respectively.

7. A fixture for friction stir welding according to claim 6, characterized in that: The OK clips (4) are provided in multiple quantities, which match the number of the push blocks (3), and the push blocks (3) contact the bottom wall of at least one of the OK clips (4).

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