Adjustment driving mechanism for friction stir welding

Abstract

The utility model belongs to the technical field of friction stir welding, and particularly relates to an adjusting driving mechanism for friction stir welding. The device comprises a rack, an inner cavity of the rack forms a working cavity in which a workpiece to be welded can be placed so as to limit the height of the workpiece to be welded, and a plurality of driving assemblies for driving the workpiece to be welded in the working cavity to circumferentially rotate and a pre-positioning baffle capable of limiting the workpiece to be welded are arranged in the working cavity. The position and the height of the to-be-welded workpiece can be automatically adjusted, so that the welding seam of the to-be-welded workpiece is matched with the position of the stirring head, the welding effect is further guaranteed, and high efficiency and convenience are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of friction stir welding, and in particular relates to an adjusting driving mechanism for friction stir welding. Background Art

[0002] Friction welding is a method that uses the heat generated by the movement and friction between the end faces of the workpieces to make the ends reach a thermoplastic state, and then quickly forges them to complete the welding. The friction stir welding process is that a stirring pin (welding pin) of a cylinder or other shape (such as a threaded cylinder) is inserted into the joint of the workpiece, and the high-speed rotation of the welding head causes it to rub against the welding workpiece material, thereby raising the temperature of the material at the connection part and softening it, and at the same time stirring and rubbing the material to complete the welding.

[0003] During the working process of existing friction stir welding, since the position of the stirring head is relatively fixed, it is often necessary to move the weld of the workpiece to be welded to the position of the stirring head, and it is also necessary to appropriately adjust the height of the workpiece to be welded. However, the existing solutions are mostly manual adjustments, which is not only time-consuming and labor-intensive, but also has low work efficiency. Utility Model Content

[0004] In order to overcome the defects in the prior art, the utility model provides an adjustable drive mechanism for friction stir welding. The utility model can automatically adjust the position and height of the workpiece to be welded, so that the weld seam of the workpiece to be welded is adapted to the position of the stirring head, and can limit the workpiece to be welded.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The invention discloses an adjustable driving mechanism for friction stir welding, comprising a frame, wherein the inner cavity of the frame constitutes a working cavity into which a workpiece to be welded can be placed so as to limit the height of the workpiece to be welded, wherein a plurality of driving components for driving the workpiece to be welded in the working cavity to produce circumferential rotation and a pre-positioning baffle plate for limiting the position of the workpiece to be welded are arranged in the working cavity; the pre-positioning baffle plate is arranged in the working cavity and is in an arc shape convex toward the direction of the workpiece to be welded.

[0007] Preferably, the mechanism further comprises a plurality of follower assemblies arranged along the circumference of the workpiece to be welded, and the pre-positioning baffle is located on the follower assemblies.

[0008] Preferably, the bottom of the driving assembly and the bottom of the follower assembly are both provided with adjustment assemblies for realizing radial height adjustment of the corresponding assemblies; the adjustment assemblies include a first wedge block, two second wedge blocks adapted to the wedge surfaces at the bottom of the first wedge block, and an adjusting screw, the adjusting screw passes through the two second wedge blocks and enables the two second wedge blocks to move toward or away from each other.

[0009] Preferably, threaded holes are provided inside the two second wedge blocks, and the thread directions of the two threaded holes are opposite; and the two ends of the adjusting screw are respectively threadedly connected to the two threaded holes.

[0010] Preferably, the mechanism also includes a base, on which a screw limit seat is fixedly provided, and the adjusting screw is provided with two limit blocks for limiting axial movement of the adjusting screw, and the screw section of the adjusting screw located between the two limit blocks passes through the screw limit seat.

[0011] Preferably, one end of the adjusting screw is drivingly connected to the second driving motor.

[0012] Preferably, the wedge surfaces at both ends of the bottom of the first wedge block are both inclined and extend upward from the inside to the outside, and the wedge surface at the top of the second wedge block is matched with the wedge surface at the bottom of the first wedge block.

[0013] Preferably, a pressure sensor is installed on the contact wedge surface between the second wedge block and the first wedge block.

[0014] Preferably, the driving assembly includes a driving roller for supporting the workpiece to be welded, a first mounting frame for mounting the driving roller, and a first driving motor for driving the driving roller to rotate.

[0015] Preferably, the follower assembly includes a follower roller for supporting the workpiece to be welded and a second mounting frame for mounting the follower roller; the bottom of the first mounting frame and the bottom of the second mounting frame are both fixedly connected to the side of the first wedge away from the second wedge.

[0016] The advantages of the utility model are:

[0017] (1) The utility model places the workpiece to be welded on the active roller and the follower roller, so that when the active roller rotates, the workpiece to be welded thereon can be driven to move, thereby achieving the purpose of quickly moving the workpiece to be welded, and can make the position of the weld seam of the workpiece to be welded consistent with the position of the welding needle of the stirring head.

[0018] (2) The utility model can guide the workpiece to be welded to be quickly placed by providing an arc-shaped pre-positioning baffle, and can also limit the workpiece to be welded to prevent it from moving out.

[0019] (3) The utility model drives the two second wedges to move toward or away from each other by rotating the adjusting screw, thereby facilitating the adjustment of the height of the workpiece to be welded, and enabling the longitudinal weld of the workpiece to be welded to be perpendicular to the horizontal plane, thereby facilitating the welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view schematic diagram of the utility model.

[0021] Figure 2 This is a schematic diagram of the overall structure of the drive assembly of the utility model.

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the drive component of the utility model.

[0023] Figure 4 It is a schematic diagram of the overall structure of the follower assembly of the utility model.

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the follower component of the utility model.

[0025] The meanings of the symbols in the figure are as follows:

[0026] 31-driving assembly, 311-active roller, 312-first driving motor, 313-first mounting bracket, 32-follow-up assembly, 321-follow-up roller, 322-pre-positioning baffle, 323-second mounting bracket, 33-adjusting assembly, 331-first wedge block, 332-second wedge block, 3321-threaded hole, 333-adjusting screw, 3331-limiting block, 334-screw limiting seat, 34-base. DETAILED DESCRIPTION

[0027] like Figure 1-5 As shown, an adjustment drive mechanism for stir friction welding includes a frame, a plurality of drive components 31, a plurality of follower components 32, a plurality of adjustment components 33, a pre-positioning baffle 322 and a base 34. The inner cavity of the frame constitutes a working cavity for placing the workpiece to be welded so as to limit the height of the workpiece to be welded. The plurality of drive components 31 are arranged in the working cavity and are used to drive the workpiece to be welded in the working cavity to produce circumferential rotation. The bottom of the drive component 31 and the bottom of the follower component 32 are both provided with adjustment components 33. The adjustment components 33 can adjust the height of the corresponding drive component 31 and the follower component 32. The plurality of adjustment components 33 are installed on the corresponding bases 34.

[0028] Specifically, Figure 1-3 As shown, the driving assembly 31 is composed of a driving roller 311, a first mounting frame 313 and a first driving motor 312. The first driving motor 312 is connected to the driving roller 311 through a coupling to drive the driving roller 311 to rotate; the driving roller 311 is mounted on the first mounting frame 313.

[0029] The follower assembly 32 is composed of a follower roller 321 and a second mounting frame 323, and the follower roller 321 is mounted on the second mounting frame 323. The pre-positioning baffle 322 can be mounted on the side of the second mounting frame 323 or the side of the first mounting frame 313, and the pre-positioning baffle 322 is in an arc shape protruding toward the direction of the workpiece to be welded, which helps to guide the workpiece to be welded to be placed on the follower roller 321 and the driving roller 311. The follower roller 321 can rotate with the rotation of the driving roller 311. A plurality of driving rollers 311 and a plurality of follower rollers 321 are arranged along the length (circumference) direction of the workpiece to be welded, and the bottom of the workpiece to be welded is placed on a plurality of driving rollers 311 and a plurality of follower rollers 321, and moves with the rotation of the driving roller 311 and the rotation of the follower roller 321.

[0030] Further, such as Figure 3 and Figure 5 As shown, the adjustment assembly 33 consists of a first wedge block 331, two second wedge blocks 332 matched with the wedge surface at the bottom of the first wedge block 331, and an adjusting screw 333. The first wedge block 331 is placed on the top of the two second wedge blocks 332. The wedge surfaces at both ends of the bottom of the first wedge block 331 are inclined from inside to outside and upward. The wedge surface at the top of the second wedge block 332 is matched with the wedge surface at the bottom of the first wedge block 331, so that when the two second wedge blocks 332 move relative to each other or move away from each other, the height of the first wedge block 331 can be adjusted.

[0031] Furthermore, the two second wedge blocks 332 are provided with threaded holes 3321 inside, and the thread directions of the two threaded holes 3321 are opposite; the two ends of the adjusting screw 333 are respectively threadedly connected with the two threaded holes 3321; the adjusting screw 333 passes through the two second wedge blocks 332 and makes the two second wedge blocks 332 move toward each other or away from each other. The two second wedge blocks 332 are respectively located at the two ends of the top of the base 34, and a screw limit seat 334 is fixedly provided in the middle of the top of the base 34. Two limit blocks 3331 are provided on the adjusting screw 333, and the screw section of the adjusting screw 333 located between the two limit blocks 3331 passes through the screw limit seat 334 to limit the axial movement of the adjusting screw 333. One end of the adjusting screw 333 is connected to the second driving motor in transmission, and a pressure sensor is installed on the contact wedge surface between the second wedge block 332 and the first wedge block 331. The second driving motor drives the adjusting screw 333 to rotate, and the two second wedge blocks 332 can be automatically moved at the same time.

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

[0033] The second drive motor drives the adjusting screw 333 to rotate, and the two second wedge blocks 332 move toward the middle (outward) at the same time, and then the first wedge block 331 moves upward (downward) to achieve high (low) adjustment; the active roller 311 is installed on the corresponding first wedge block 331, and the follower roller 321 is installed on the corresponding first wedge block 331. The first drive motor 312 drives the active roller 311 to rotate, and the active roller 311 and the follower roller 321 can be adjusted in height and rotated as a whole: the height adjustment ensures that each roller can contact the workpiece to be welded, ensures the contact force and can achieve the horizontal adjustment of the workpiece to be welded, thereby ensuring the verticality of the longitudinal weld; the rotation can realize the rotation of the product, thereby achieving the position adjustment of the longitudinal seam of the workpiece to be welded.

[0034] Adaptive height adjustment method: the second drive motor of the adjusting screw 333 can cooperate with the displacement sensor in the height direction to realize the automatic rotation of the second drive motor of the adjusting screw 333; when the target height changes, the second drive motor can rotate automatically to make the active roller 311 or the follower roller 321 reach the adaptive adjustment of the target height; it can also cooperate with the pressure sensor, etc. to realize the contact force control of the constant pressure of the contact surface of the active roller 311 or the follower roller 321: when the pressure sensor is configured, the first wedge block 331 can also be set as two parts, and a pressure sensor installation position is added between the two parts, and the pressure sensor can receive the pressure signal in the vertical direction;

[0035] A guiding mechanism is provided between the first wedge block 331 and the second wedge block 332, and vertical constraint can be achieved by relying on the deadweight of the workpiece to be welded or the locking screw; a pre-stressing spring can also be configured, and the pre-stressing spring is installed on the upper plane position of the first wedge block 331, so that the pre-stressing spring applies an elastic force to the first wedge block 331, thereby achieving the fit between the first wedge block 331 and the second wedge block 332.

[0036] This mechanism can also be rotated 90 degrees and used horizontally to achieve horizontal position adjustment. (Not used in this working condition)

[0037] A spring mechanism can be added between the first wedge block 331 and the active roller 311 to achieve flexible contact control of the active roller 311: the first wedge block 331 can be set as two parts, and a spring installation position can be added between the two parts. The contact force between the active roller 311 and the workpiece to be welded is transmitted by the spring. Since the spring can be extended and compressed, even if there is a small change in the product height, it can be ensured that the active roller 311 and the workpiece to be welded are always in contact, thereby achieving flexible contact control.

[0038] When the utility model is applied to stirring welding of workpieces to be welded, the position of the weld is adjusted through height adjustment and rotation, so that the longitudinal weld of the cylinder is perpendicular to the horizontal plane.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustment drive mechanism for friction stir welding, characterized in that: The invention comprises a frame, wherein the inner cavity of the frame forms a working cavity in which a workpiece to be welded can be placed so as to limit the height of the workpiece to be welded, and a plurality of driving components (31) for driving the workpiece to be welded in the working cavity to generate circumferential rotation and a pre-positioning baffle (322) for limiting the position of the workpiece to be welded are arranged in the working cavity; the pre-positioning baffle (322) is arranged in the working cavity and is in an arc shape protruding in the direction of the workpiece to be welded.

2. The adjusting drive mechanism for friction stir welding according to claim 1, characterized in that: The mechanism also includes a plurality of follower assemblies (32) arranged along the circumference of the workpiece to be welded, and a pre-positioning baffle (322) is located on the follower assemblies (32).

3. The adjusting drive mechanism for friction stir welding according to claim 2, characterized in that: The bottom of the driving component (31) and the bottom of the follower component (32) are both provided with an adjustment component (33) for realizing radial height adjustment of the corresponding components; the adjustment component (33) comprises a first wedge block (331), two second wedge blocks (332) adapted to the wedge surface at the bottom of the first wedge block (331), and an adjustment screw (333), wherein the adjustment screw (333) passes through the two second wedge blocks (332) and enables the two second wedge blocks (332) to move toward or away from each other.

4. The adjusting drive mechanism for friction stir welding according to claim 3, characterized in that: The two second wedge blocks (332) are each provided with a threaded hole (3321) inside, and the thread directions of the two threaded holes (3321) are opposite; and the two ends of the adjusting screw rod (333) are respectively threadedly connected to the two threaded holes (3321).

5. The adjusting drive mechanism for friction stir welding according to claim 4, characterized in that: The mechanism also includes a base (34), a screw limit seat (334) is fixedly provided on the base (34), two limit blocks (3331) are provided on the adjusting screw (333) for limiting the axial movement of the adjusting screw (333), and a screw section of the adjusting screw (333) located between the two limit blocks (3331) passes through the screw limit seat (334).

6. The adjusting drive mechanism for friction stir welding according to claim 5, characterized in that: One end of the adjusting screw rod (333) is drivingly connected to the second driving motor.

7. The adjusting drive mechanism for friction stir welding according to claim 3, characterized in that: The wedge surfaces at both ends of the bottom of the first wedge block (331) are both inclined and extend upward from the inside to the outside, and the wedge surface at the top of the second wedge block (332) is matched with the wedge surface at the bottom of the first wedge block (331).

8. The adjusting drive mechanism for friction stir welding according to claim 3, characterized in that: A pressure sensor is installed on the contact wedge surface between the second wedge block (332) and the first wedge block (331).

9. The adjusting drive mechanism for friction stir welding according to claim 3, characterized in that: The driving assembly (31) comprises a driving roller (311) for supporting a workpiece to be welded, a first mounting frame (313) for mounting the driving roller (311), and a first driving motor (312) for driving the driving roller (311) to rotate.

10. The adjusting drive mechanism for friction stir welding according to claim 9, characterized in that: The follower assembly (32) comprises a follower roller (321) for supporting a workpiece to be welded and a second mounting frame (323) for mounting the follower roller (321); the bottom of the first mounting frame (313) and the bottom of the second mounting frame (323) are both fixedly connected to a side of the first wedge block (331) away from the second wedge block (332).

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