Outer embracing positioning device for friction stir welding

Abstract

The utility model belongs to the technical field of friction stir welding, and particularly relates to an outer embracing positioning device for friction stir welding. The device comprises a hoop used for surrounding a workpiece to be welded, a driving assembly used for driving the hoop to be opened and closed in the radial direction, and a floating pressing assembly used for pressing the workpiece to be welded. The driving assemblies are distributed on the two sides of the open end of the hoop, and driving sources of the driving assemblies are connected with the outer wall of the hoop. The floating pressing assembly comprises a plurality of pressing strips installed on the inner wall of the hoop at intervals, and the opening end forms a working gap allowing the stirring needle to stretch into. By arranging the hoop capable of being opened and closed and the driving assembly, a workpiece to be welded can be clamped and positioned, the size of a longitudinal seam of the workpiece to be welded can be controlled, and the welding effect can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of friction stir welding, and particularly relates to an outer-ring holding positioning device for friction stir welding. Background Art

[0002] Friction stir welding uses frictional heat and plastic deformation heat as the welding heat source. A columnar or other-shaped stirring pin with threads, etc., extends into the part to be welded of the workpiece. Through the high-speed rotation of the stirring pin, it generates heat by frictional contact with the workpiece material, thereby raising the temperature of the connecting part material to the high-temperature plastic state. During the welding process, the rotating stirring head (mainly the shoulder) generates heat by frictional contact with the workpiece surface, causing strong plastic deformation of the material on the advancing side of the stirring head. As the stirring head moves, the high-temperature plastically deformed material undergoes plastic flow and flows into the cavity behind the stirring head, forming a complete weld seam under the axial pressure.

[0003] After the cylinder body is rolled into a circle by a rolling machine, there will be a seam in the middle, called a longitudinal seam. The existing welding of the longitudinal seam basically adopts the method of manual arc welding, and there is no requirement for the width of the longitudinal seam. However, if the longitudinal seam is welded by friction stir welding, during welding, it is necessary to adjust the longitudinal seam to control its size, otherwise the normal progress of welding cannot be guaranteed.

[0004] Therefore, there is an urgent need for an outer-ring holding positioning device for friction stir welding to solve the above problems. Content of the Utility Model

[0005] In order to overcome the defects in the above-mentioned prior art, the utility model provides an outer-ring holding positioning device for friction stir welding. By setting an openable and closable hoop and a driving component, the workpiece to be welded can be clamped, positioned, and the size of the longitudinal seam of the workpiece to be welded can be controlled, which helps to ensure the welding effect.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An outer-ring holding positioning device for friction stir welding includes a hoop for holding the workpiece to be welded, a driving component for driving the hoop to open and close radially, and a floating pressing component for pressing the workpiece to be welded; the driving components are distributed on both sides of the open end of the hoop, and the driving source of the driving component is connected to the outer wall of the hoop. At this time, the open end forms a working gap for the stirring pin to extend into.

[0008] Preferably, the hoop is formed by hinging two semi-circular hoop bodies, and the non-hinged ends of the two semi-circular hoop bodies form the open end.

[0009] Preferably, the driving component includes a driving source and a mounting bracket. The mounting bracket is provided with a through hole, and the driving source is movably installed in the through hole, thereby realizing the horizontal swinging movement of the driving source.

[0010] Preferably, the telescopic end of the driving source extends out of the through hole, and a connecting sleeve is fixedly sleeved on the telescopic end of the driving source. The outer wall of the connecting sleeve is hinged to the first hinge seat through a first pin shaft. A push plate is integrally formed on the outer wall of the open end of the hoop. The first hinge seat is detachably connected to the push plate.

[0011] Preferably, the floating pressing assembly further includes a plurality of pressing strips installed on the inner wall of the hoop at intervals, pressing blocks located inside the open ends of the two semi-circular hoop bodies, and adjusting screws penetrating through the ends of the open ends of the two semi-circular hoop bodies; one end of the adjusting screw located inside the semi-circular hoop body is fixedly connected to the pressing block.

[0012] Preferably, a pre-tightening spring is sleeved on the end of the adjusting screw located outside the semi-circular hoop body.

[0013] Preferably, the end face of the pressing block close to the semi-circular hoop body is arc-shaped.

[0014] Preferably, wedge surfaces extend from the inside to the outside at the open ends of the two semi-circular hoop bodies, and a plurality of pressing blocks are arranged at intervals along the height direction of the semi-circular hoop body.

[0015] Preferably, the driving source is installed on the second hinge seat, and the second hinge seat is connected to the inner wall of the through hole through a rotating shaft, so that the driving source can swing horizontally; a plurality of driving sources are arranged along the height direction of the mounting bracket.

[0016] Preferably, the hinged ends of the two semi-circular hoop bodies are both hinged to the support ear seats through second pin shafts.

[0017] The advantages of the present utility model are as follows:

[0018] (1) By providing an openable and closable hoop and a driving assembly, the driving assembly can drive the hoop to tighten or open, and can clamp, position the workpiece to be welded and control the size of the longitudinal seam of the workpiece to be welded, which helps to ensure the welding effect of friction stir welding.

[0019] (2) The arc-shaped pressing blocks provided in the present utility model enable the pressing blocks to swing, which is convenient for the pressing blocks to better fit the workpiece to be welded; through the pre-tightening of the pre-tightening spring, it is convenient for the pressing blocks to be tightly attached to the hoop; the provided adjusting screws are convenient for tightening the pressing blocks, increasing the contact area between the pressing blocks and the workpiece to be welded, and ensuring the pressing force. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of the driving assembly of the present utility model.

[0022] Figure 3 It is a schematic top view structural diagram of the present utility model.

[0023] Figure 4 This is a schematic enlarged structure diagram of the pressing block of the utility model.

[0024] The meanings of the reference symbols in the figure are as follows:

[0025] 11 - Hoop, 111 - Push plate, 112 - Semi-circular hoop body, 12 - Driving assembly, 121 - Driving source, 122 - Mounting bracket, 1221 - Through hole, 123 - Connecting sleeve, 124 - First hinge seat, 131 - Pressing strip, 132 - Pressing block, 133 - Adjusting screw, 134 - Pre-tightening spring, 14 - Support ear seat, 15 - Second hinge seat. Specific embodiments

[0026] As Figures 1-4 shown, an outer-ring holding and positioning device for friction stir welding includes a hoop 11, a driving assembly 12 and a floating pressing assembly. The driving assembly 12 is distributed on both sides of the open end of the hoop 11. The hoop 11 includes two semi-circular hoop bodies 112. The hinged ends of the two semi-circular hoop bodies 112 are both hinged to the support ear seat 14 through a second pin shaft. The non-hinged ends of the two semi-circular hoop bodies 112 are open ends, and the open ends form a working gap for the stirring pin to extend into. Wedge surfaces extend from the inside to the outside at the open ends of the two semi-circular hoop bodies 112, and the open ends are in a "V" shape, which is convenient for increasing the welding activity space and further convenient for aligning the longitudinal seam for welding.

[0027] Specifically, the driving assembly 12 includes a driving source 121 and a mounting bracket 122. A through hole 1221 is provided on the mounting bracket 122. The driving source 121 is installed on the second hinge seat 15. The second hinge seat 15 is connected to the inner wall of the through hole 1221 through a rotating shaft, so that the driving source 121 can rotate on the horizontal plane. The telescopic end of the driving source 121 extends out of the through hole 1221, and a connecting sleeve 123 is fixedly sleeved on the telescopic end of the driving source 121. The outer wall of the connecting sleeve 123 is hinged to the first hinge seat 124 through a first pin shaft. A push plate 111 is provided on the outer wall of the open end of the hoop 11. The first hinge seat 124 is detachably connected to the threaded hole on the push plate 111 through a screw. A plurality of driving sources 121 are arranged along the height direction of the mounting bracket 122, which is convenient for flexibly clamping the hoop 11.

[0028] Since the force at the weld position is very large during welding, the push plate 111 of the hoop 11 is made by integral machining, that is, the push plate 111 and the hoop 11 are integrally formed and are of a solid structure, which can avoid the problem of insufficient connection strength caused by welding quality.

[0029] Further, the floating pressing assembly includes a plurality of pressing strips 131 installed at intervals on the inner wall of the hoop 11, pressing blocks 132 located inside the opening ends of the two semi-circular hoop bodies 112, and adjusting screws 133 passing through the ends of the opening ends of the two semi-circular hoop bodies 112. One end of the adjusting screw 133 located inside the semi-circular hoop body 112 is fixedly connected to the pressing block 132. A plurality of pressing blocks 132 are arranged at intervals along the height direction of the semi-circular hoop body 112, ensuring that the pressing blocks 132 can be in full contact with the workpiece to be welded. The end face of the pressing block 132 close to the semi-circular hoop body 112 is arc-shaped, enabling the pressing block 132 to swing, facilitating better fitting of the pressing block 132 to the workpiece to be welded.

[0030] When the pressing block 132 is not in contact with the workpiece to be welded, by tightening the adjusting screw 133, the adjusting screw 133 drives the pressing block 132 closer to the workpiece to be welded until the pressing block 132 contacts the workpiece to be welded, thereby ensuring the contact between the pressing block 132 and the workpiece to be welded and ensuring the pressing force.

[0031] Furthermore, a pre-tightening spring 134 is sleeved on one end of the adjusting screw 133 located outside the semi-circular hoop body 112. Through the pre-tightening of the pre-tightening spring 134, it is convenient for the pressing block 132 to be closely attached to the hoop.

[0032] The working process of the device will be described in detail below with reference to the accompanying drawings in the embodiments.

[0033] The driving source 121 is an oil cylinder. A plurality of through holes 1221 are provided on the mounting bracket 122. The oil cylinder is installed in the through holes 1221 and can rotate along the rotating shaft. And there is a floating gap reserved between the first hinge seat 124 and the connecting sleeve 123 to ensure the freedom of the oil cylinder and prevent mutual interference. Driven by the oil cylinder, the hoop 11 can rotate around the rotating shaft. When the two semi-circular hoop bodies 112 are tightened (closed), a plurality of pressing blocks 132 and a plurality of pressing strips 131 distributed on the hoop 11 press the workpiece to be welded. Gaskets can be installed between the pressing strips 131 and the hoop 11 for adjustment to make the pressing strips 131 in full contact with the workpiece to be welded.

[0034] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An outer-ring hugging positioning device for friction stir welding, characterized in that It includes a hoop (11) for clamping the workpiece to be welded, a driving component (12) for driving the hoop (11) to open and close radially, and a floating pressing component for pressing the workpiece to be welded; the driving components (12) are distributed on both sides of the open end of the hoop (11), and the driving source (121) of the driving component (12) is connected to the outer wall of the hoop (11). At this time, the open end forms a working gap for the stirring needle to extend into.

2. The outer-ring hugging positioning device for friction stir welding according to claim 1, wherein: The hoop (11) is formed by hinging two semi-circular hoop bodies (112), and the non-hinged ends of the two semi-circular hoop bodies (112) form the open end.

3. The outer-ring holding positioning device for friction stir welding according to claim 1, wherein: The driving component (12) includes a driving source (121) and a mounting bracket (122). A through hole (1221) is provided on the mounting bracket (122), and the driving source (121) is movably installed in the through hole (1221) to realize the horizontal swinging action of the driving source (121).

4. The outer-ring holding positioning device for friction stir welding according to claim 3, characterized in that: The telescopic end of the driving source (121) extends out of the through hole (1221), and a connecting sleeve (123) is fixedly sleeved on the telescopic end of the driving source (121). The outer wall of the connecting sleeve (123) is hinged to a first hinge seat (124) through a first pin shaft. A push plate (111) is integrally formed on the outer wall of the open end of the hoop (11), and the first hinge seat (124) is detachably connected to the push plate (111).

5. The outer-ring clamping positioning device for friction stir welding according to claim 2, characterized in that: The floating pressing component further includes a plurality of pressing strips (131) installed at intervals on the inner wall of the hoop (11), a pressing block (132) located inside the open ends of the two semi-circular hoop bodies (112), and an adjusting screw (133) passing through the ends of the open ends of the two semi-circular hoop bodies (112); one end of the adjusting screw (133) located inside the semi-circular hoop body (112) is fixedly connected to the pressing block (132).

6. The outer-ring holding positioning device for friction stir welding according to claim 5, wherein: A pre-tightening spring (134) is sleeved on the end of the adjusting screw (133) located outside the semi-circular hoop body (112).

7. A circumferential positioning device for friction stir welding according to claim 5, characterized in that: The end face of the pressing block (132) close to the semi-circular hoop body (112) is arc-shaped.

8. The outer-ring holding positioning device for friction stir welding according to claim 5, wherein: Wedge surfaces extend from the inside to the outside at the open ends of the two semi-circular hoop bodies (112), and a plurality of pressing blocks (132) are arranged at intervals along the height direction of the semi-circular hoop body (112).

9. The outer-ring holding positioning device for friction stir welding according to claim 3, characterized in that: The driving source (121) is installed on a second hinge seat (15), and the second hinge seat (15) is connected to the inner wall of the through hole (1221) through a rotating shaft, so that the driving source (121) can swing horizontally; a plurality of driving sources (121) are arranged along the height direction of the mounting bracket (122).

10. The outer-ring holding positioning device for friction stir welding according to claim 2, characterized in that: The hinged ends of the two semi-circular hoop bodies (112) are both hinged to a support ear seat (14) through second pin shafts.

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