KR100831222B1 - Friction Stir Welding Device - Google Patents

Abstract

The present invention relates to a friction stir welding device, and more particularly, to a friction stir welding device capable of maintaining a welding angle in a normal direction of a welding surface of a rotating tool moving along a joint portion of a base material.

The present invention provides a friction stir welding device provided in a welding head to form a solid-state joint by a frictional heat and mechanical processing combination of a rotating tool and a base metal, the cross-rail assembly and the welding enabling the X-axis movement of the welding head. It has a configuration including a bed assembly to enable the Z-axis movement of the head and a welding head assembly to enable the Y-axis movement of the welding head, the welding head assembly interpolates the welding angle of the rotating tool and the base material (補 間) Interpolation means for rotating the tool in the normal direction of the joining interface is further provided.

According to the present invention, there is an advantage that the welding time is shortened and the weld surface is smooth since the welding angle does not need to be adjusted separately during the curved surface processing.

Description

A friction stir welding device

1 is a perspective view showing the configuration of a friction stir welding device according to the present invention.

2 is a perspective view of a welding head assembly which is a main part of a friction stir welding device according to the present invention;

3 is a front cross-sectional view of FIG. 2.

4 is a side cross-sectional view of FIG.

Explanation of symbols on the main parts of the drawings

100 ..... bed assembly 110 ..... bed

120 ..... support frame 200 ..... crossrail assembly

220 ..... Guide rail 300 ..... Control panel assembly

400 ..... weld head assembly 410 ..... moving plate

412 ..... Z-axis guide 414 ..... X-axis guide

416 ..... weld head assembly cover 420 ..... inverter motor

422 ..... Motor Pulley 430 ..... Main Shaft

432 ..... timing pulley 450 ..... spindle

460 ..... Mainframe 462 ..... Link

464 ..... Turning Bracket 466 ..... Spindle Bracket

470 ..... constant velocity joint 480 ..... weld head

482 ..... Tool 484 .... Chuck

490 ..... Turning housing 500 ..... Interpolation means

520 ..... Servomotor 540 ..... Turning Gear

560 ..... Interpolation gear 600 ..... Angle adjusting means

620 ..... upper fixing bracket 640 ..... lower fixing bracket

660 ..... Angle adjusting screw

The present invention relates to a friction stir welding device, and more particularly, to a friction stir welding device for allowing a rotary tool moving along a joining portion of a base material to automatically maintain a welding angle in a normal direction of a welding surface.

In general, friction stir welding (FSW) is a part of a non-consumable rotary tool that is harder than the bonded base material is inserted along the butt face of the joint and then joined to the tool. The relative motion of the base material causes the frictional heat to be generated to heat the adjacent joints to a temperature sufficient to soften them.

This creates a so-called “third-body” area that softens around the part where the tool is inserted, and applies a mechanical force to the third body to move the tool along the seam, thereby heating the heated area. It is extruded from the advancing side to the retreating side, and the solid state junction is formed by the combination of frictional heat and mechanical processing as described above.

The tool for the joining process as described above is composed of a pin (Pin) is inserted to form a predetermined angle to the base material and a shoulder (Shoulder) to expand the portion heated by the pin, the shoulder by pressing the softened portion It forms a smooth weld surface.

And, such a tool is mounted on a friction stir welding device that enables the movement of the tool in the X, Y, Z axis by a plurality of guides and motors to face the face when the pin passes along the seam of the joining base material. It is possible to perform welding while moving more stably.

However, the above conventional technologies have the following problems.

During welding, the welding object and the tool make welding at a predetermined welding angle in order to clean the quality of the joint and the shape of the surface fitting. The friction stir welding device according to the prior art maintains the initial welding angle to the end in the straight line processing. Because of the welding, the surface pits are formed in a constant shape while maintaining a constant bonding quality.

However, during curved processing, the tool moves along the joining interface of the base material while maintaining the initially formed welding angle. If the welding angle is not changed separately, the joining quality is not constant and the surface pits are irregularly shaped so that the appearance is not beautiful. There is a problem.

In addition, in order to prevent this, the welding angle may be manually adjusted for each predetermined portion during curved processing, which has a problem that the time required for the welding operation is increased, and there is also a problem that the productivity is lowered.

An object of the present invention, which was devised to solve the problems of the prior art as described above, is to provide a friction stir welding device provided with interpolation means for automatically interpolating a welding angle to form a normal direction with a joining interface of a base material.

Another object of the present invention is to provide a friction stir welding device that rotates a welding head which rotates the welding tool to always be in a normal direction with respect to the joining interface of the base material when the interpolation means is curved.

Still another object of the present invention is to provide a friction stir welding device in which a main shaft, which is a main shaft, and a spindle, which is a longitudinal axis, are connected with a constant velocity joint to reduce noise and vibration.

The present invention provides a friction stir welding device provided in a welding head to form a solid-state joint by a frictional heat and a mechanical machining combination of a rotating tool and a base metal, wherein the cross rail assembly enables X-axis movement of the welding head. It has a configuration including a bed assembly to enable the Y-axis movement of the head and a welding head assembly to enable the Z-axis movement of the welding head, the welding head assembly interpolates the welding angle of the rotating tool and the base material (補 間) The interpolation means for rotating the tool in the normal direction of the joining interface is further provided.

In another aspect, the present invention is composed of a cross-rail assembly to enable the X-axis movement of the welding point, a bed assembly to enable the Y-axis movement of the welding point and a welding head assembly to enable the Z-axis movement of the welding point. In the friction stir welding device for moving the rotating tool to form a solid-state joint by the frictional heat and mechanical processing combination of the base material and the tool, the welding head assembly is a main frame to form a basic skeleton, inside the main frame It is accommodated, the main shaft is rotated and connected by the inverter motor and the timing pulley, the spindle for transmitting the rotational force of the main shaft to the tool, the spindle bracket coupled to the main frame, to form a space in which the spindle is mounted, the spindle And a turning bracket that rotates separately from the spindle, A turning housing coupled to the turning bracket so that the turning bracket rotates separately from the spindle, interposed between the main shaft and the spindle, and a constant velocity joint connecting the main shaft and the spindle and separate from the rotation of the main shaft. It is provided on one side of the turning housing as characterized in that it comprises an interpolation means for rotating the turning bracket.

The interpolation means is characterized in that it comprises a servo motor for generating a rotational force, an interpolation gear provided on the rotating shaft of the servomotor and the turning housing, the turning gear is engaged with the interpolation gear and the teeth.

The spindle bracket is characterized in that the inclination is adjusted by the angle adjusting means fixed to connect one side of the turning bracket and one side of the spindle bracket.

The angle adjusting means includes an upper fixing bracket fixed to the turning bracket and a lower fixing bracket fixed to the spindle bracket, and an angle adjusting screw accommodated in the upper fixing bracket and the lower fixing bracket. do.

The main shaft and the spindle are splined to correspond to the internal shape of the constant velocity joint.

According to the present invention as described above there is an advantage that the weld surface is smooth and the working noise is reduced.

Hereinafter, a friction stir welding device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the configuration of a friction stir welding device according to the present invention.

As shown in the drawings, the friction stir welding device according to the present invention is welded by welding the bed assembly 100, that is, the base material is seated and fixed on the upper surface, near the junction of the base material fixed to the bed assembly 100 The welding head assembly 400 to perform the work, and the cross-rail assembly 200 to enable the sliding movement of the welding head assembly 400 and the operation panel assembly 300 for controlling the respective components, and the like. .

In more detail, the bed assembly 100 is not shown in the drawing, but the bed 110 is configured to be movable in the Y-axis (front and rear direction in the drawing) by using a drive motor and a guide, and the base material on the upper surface. A table (not shown) having a separate fixing means is further mounted to be seated and fixed.

That is, the bed assembly 100 is to move the base material fixed on the upper side of the table (not shown) in the Y-axis direction in the state that the welding head 480 to be described below is fixed, the bed for this purpose The inside of the assembly 100 is further provided with a guide (not shown) for guiding the sliding movement of the bed 110 in the Y-axis direction.

In addition, the bed 110 is formed in a multi-stage plate shape, the size of which increases from the outside to the center, the hollow is formed inside the length is adjusted while receiving a small size plate inward by the sliding movement.

In addition, a support frame 120 is formed at a central side of the bed assembly 100 to form a space in which the cross rail assembly 200 is mounted.

The support frame 120 is formed to protrude upward from a central side of the bed assembly 100 to a predetermined height to form a pier shape across the width of the bed assembly 100.

In addition, a cross rail assembly 200 is provided at the front side of the support frame 120.

In more detail, the crossrail assembly 200 guides the welding head assembly 400 so as to be slidably movable in the X-axis direction (left and right directions in the drawing), the center of the bed assembly 100. It is provided on the front side of the support frame 120 protruding upward from the side, the guide rail 220 is provided along the support frame 120 for the sliding movement of the welding head assembly 400.

In addition, the guide rail 220 is equipped with a welding head assembly 400 which will be described in more detail with reference to the drawings below. For this purpose, the welding head assembly 400 is provided with upper and lower ends of the guide rail 220. It is provided with an X-axis guide (reference numeral 414 in Fig. 2) mounted to each.

In addition, the welding head assembly 400 is provided with a Z-axis guide 412 in a direction orthogonal to the X-axis guide (reference numeral 414 in FIG. 2), that is, the height direction of the welding head assembly 400. The X-axis guide (414 in FIG. 2) and the Z-axis guide 412 is formed in a plate shape having a predetermined thickness in a substantially rectangular shape, so that the welding head assembly 400 is movable. It is provided on the back and front of each.

Meanwhile, an operation panel assembly connected to the bed assembly 100, the cross rail assembly 200, and the welding head assembly 400 on one side of the support frame 120 to control the operation of each component through a control signal. 300 is provided.

Although not shown in detail in the drawing, the operation panel assembly 300 includes a control unit for processing a control signal inside a rectangular case, and a display showing an operation state of each component processed through the control unit is illustrated in the case. It is provided on the front. In addition, a plurality of operation buttons are provided near the display to allow a user to input an operation signal to the control unit.

Hereinafter, the welding head assembly 400 will be described in more detail with reference to the accompanying drawings.

2 is a perspective view of a welding head assembly which is a main part of a friction stir welding device according to the present invention, FIG. 3 is a front sectional view of FIG. 2, and FIG. 4 is a side sectional view of FIG. 2.

As shown in these drawings, the welding head assembly 400 has a basic skeleton formed by the main frame 460, and the welding head assembly cover 416 is provided on the outside to protect the internal parts while providing a beautiful appearance. do.

In addition, the upper side of the main frame 460 is provided with an inverter motor 420 for rotating the main shaft 430 to be described below by the rotation, the main shaft 430 is the lower end of the rotation shaft of the inverter motor 420 The motor pulley 422 and the timing pulley 432 provided on the upper end of the main shaft 430 are rotated in conjunction with the inverter motor 420 by a timing belt (not shown).

On the other hand, the inside of the main frame 460 is further provided with a turning housing 490 to allow the main shaft 430 to rotate stably.

The turning housing 490 accommodates the main shaft 430 therein to prevent left and right shaking, and rotates separately from the main shaft 430.

In addition, the turning housing 490 is configured to rotate separately from the main shaft 430 by the interpolation means 500 to be described in detail below. To this end, a turning gear 540 is provided on an outer circumferential surface of the turning housing 490 in which a tooth of a shape corresponding to the tooth of the interpolation gear 560 is formed as one configuration of the interpolation means 500.

Referring to the interpolation means 500 in more detail, the interpolation means 500 is mounted on the rotation axis of the servo motor 520 provided on the upper side of the main frame 460 to rotate in conjunction with the servo motor 520 The interpolation gear 560 and the turning gear 540 formed on the outer circumferential surface of the turning housing 490 and engaged with the interpolation gear 560 to rotate.

That is, the interpolation gear 560 receives the rotational force by rotating the servomotor 520 rotates, and the turning gear 540 engaged with the rotational rotation receives the rotational force of the interpolation gear 560 and rotates the turning housing 490. ) Is configured to rotate.

Accordingly, the turning housing 490 is rotated by the turning gear 540 and the interpolation gear 560 irrespective of the rotation of the main shaft 430 provided therein, thereby forming another rotating shaft.

On the other hand, the turning bracket 464 is fixed to the lower side of the turning housing 490 by the link 462.

That is, the link 462 provides a space in which the lower side of the turning bracket 464 and the spindle bracket 466 to be described below are mounted, and the rotational force of the turning housing 490 is connected through the coupling relationship. Transfer to spindle bracket 466 to allow the spindle bracket 466 to rotate with the turning housing 490.

The spindle bracket 468 is provided inside the spindle bracket 468 to be connected to the main shaft 430 and rotates. The spindle 450 is connected to the main shaft 430 by the constant velocity joint 470. .

In addition, the main shaft 430 and the spindle 450 is splined on the outer circumferential surface in order to facilitate the transfer of torque. That is, the projection of the shape corresponding to the recess groove formed in the constant velocity joint 470 is processed on the outer circumferential surface and doubled with the constant velocity joint 470 to double the transmission of rotational force.

In addition, the constant velocity joint 470 is provided to compensate for the inclination of the spindle 450 and the main shaft 430 accommodated therein when the spindle bracket 468 has a predetermined slope to interpolate the welding angle. It may be possible to use a universal joint, but considering the noise and vibration, it is most preferable to use the constant velocity joint 470.

On the other hand, the welding head 480 is provided below the spindle 450.

The welding head 480 is composed of a tool (482) for moving while rotating along the butt face of the joint after fixing the bonded base material and the chuck 484 for fixing the tool 482, the tool 482 Although not shown in the drawings, a relatively large diameter shoulder and a smaller diameter are divided into pins processed into a special shape, and the pin portion is inserted into the joint portion of the base material.

And, the pin is formed in a curve rising in one direction on the outer circumferential surface is inserted into the softened base material is rotated to extrude the softened base material from the front to the rear, the extruded base material by the shoulder Pressurized to maintain a smooth surface.

On the other hand, the welding angle formed by the welding head 480 is adjusted by the angle adjusting means 600.

The angle adjusting means 600 is an upper fixing bracket 620 fixed to the turning bracket 464 and the lower fixing bracket 640 and the upper fixing bracket 620 and the lower fixing fixed to the spindle bracket 466 It is composed of an angle adjusting screw 660 configured to be adjustable in the length of the bracket 640, by adjusting the length of the angle adjusting screw 660 by pushing one side of the spindle bracket 466 in one direction. The spindle frame 464 is biased to one side.

Hereinafter, the operation of the present invention having the configuration as described above.

In order to perform friction stir welding using the friction stir welding device according to the present invention, first, a base material for joining is fixed to an upper side of a table (not shown) provided in the bed assembly 100.

In addition, the welding head assembly 400 performs friction stir welding in a state where the base material and the welding head 480 are adjusted to form a constant welding angle by using the angle adjusting means 600.

After the welding angle is formed in the welding head assembly 400 and the base material is fixed to the bed assembly 100, the welding head according to a shape previously input through the operation panel assembly 300 to the fixed base material. While the assembly 400 and the cross-rail assembly 200 and the bed assembly 100 operate in conjunction with each other, the substrate is processed into a shape input through the operation panel assembly 300.

That is, the bed 100 of the bed assembly 100 is moved so that the base material is located below the welding head assembly 400, the Z-axis guide provided in the welding head assembly 400 in the above state Along the tool 412, the tool 482 of the welding head 480 is inserted into the joint portion of the base material at a predetermined depth.

Of course, at this time, the tool 482 is maintained in a rotating state.

On the other hand, when the tool 482 is inserted into the bonding portion of the base material as described above, the cross-rail assembly 200 and the bed assembly 100 in accordance with the information input to the operation panel assembly 300 along a predetermined path Will move.

In more detail, in the case of straight line processing, the bed assembly 100 moves the bed 110 to move the tool 482 in a straight line along a joint, and in the case of diagonal or curved processing, the bed assembly 100 and the crossrail assembly 200 interlock with each other to move the tool 482 diagonally or curvedly.

On the other hand, in the case of the above-described linear processing, the interpolation means 500 is not operated, but in the case of oblique or curved processing, the turning housing 490 is rotated according to the movement of the tool 482 to interpolate the welding angle. do.

The process of friction stiring the semi-circular shape as an example will be described in detail. When the tool 482 processes the semi-circular shape along a path from 3 o'clock to 9 o'clock in the counterclockwise direction, the bed assembly 100 and the cross rail The assembly 200 interlocks with each other to move the tool 482 from right to left.

In this case, the interpolation means 500 rotates the turning housing 490 to interpolate the welding angle formed by the joint portion of the base material and the tool 482 to form a constant welding angle with the joint portion. The ends always face the center of the semicircle so that the joining surface is formed in the same shape throughout the semicircle.

That is, while the tool 482 moves from the 3 o'clock position to the 12 o'clock position, the interpolation means 500 rotates the servomotor 520 so that the turning housing 490 is rotated a quarter turn. The turning housing 490 rotates two quarters while moving to the nine o'clock position, thereby enabling friction stir welding while the tool 482 and the joint surface always maintain the normal direction.

The scope of the present invention as described above is not limited to the above-described embodiment, but many other modifications based on the present invention will be possible to those skilled in the art to which the present invention pertains.

For example, in the present invention, the turning housing in which the rotational force of the servo motor, which is one component of the interpolation means, is connected to the spindle bracket, is configured to interlock so that the teeth of the turning gear and the interpolation gear are interlocked with each other, but using a pull and a timing belt. It would be possible to transfer the rotational force of the servomotor.

However, the above modification is included in the technical idea of the present invention that the welding housing, that is, the tool always maintains the welding angle in the normal direction by rotating the turning housing in which the tool is mounted using the rotational force of the servomotor. Will be self explanatory.

According to the present invention, a welding head, which is one component of a friction stir welding device, is rotated in real time using interpolation means, so that the welding angle between the joining interface and the tool is always kept constant in the normal direction.

Accordingly, as described above, the welding angle is subjected to friction stir welding while automatically maintaining the normal direction along the joint interface, so that the welding time is not required to adjust the welding angle during diagonal or curve processing, thereby reducing the welding time.

In addition, since the welding angle is interpolated in real time through the interpolation means, it is possible to perform a more precise welding operation.

In addition, the welding time is shortened as described above, there is an advantage that the productivity is improved, and the joint interface and the welding tool is always maintained in the normal direction, the joint surface is smooth and the welding efficiency is increased.

In addition, since the main shaft and the longitudinal spindle are connected by the constant velocity joint for interpolation of the welding angle, noise and vibration are reduced.

Claims (6)

In the friction stir welding device provided in the welding head to form a solid-state joint by the frictional heat and mechanical processing combination of the rotating tool and the base material, A crossrail assembly for enabling X-axis movement of the weld head; A bed assembly for enabling Y axis movement of the weld head; It has a configuration including a welding head assembly for enabling the Z axis movement of the welding head, The welding head assembly, And an interpolation means for rotating the tool in the normal direction of the joining interface to interpolate a welding angle between the rotating tool and the base metal. The tool consists of a cross rail assembly that enables the X-axis movement of the welding point, a bed assembly that enables the Y-axis movement of the welding point, and a welding head assembly that enables the Z-axis movement of the welding point. In the friction stir welding device which moves and forms the solid state joint by the frictional heat and the mechanical machining combination of the base material and the tool, The welding head assembly, The mainframe forming the base skeleton, A main shaft accommodated in the main frame and connected and rotated by an inverter motor and a timing pulley; Spindle for transmitting the rotational force of the main shaft to the tool, A spindle bracket coupled to the main frame to form a space in which the spindle is mounted; A turning bracket accommodating the spindle therein and rotating separately from the spindle; A turning housing coupled to the turning bracket to rotate the turning bracket separately from the spindle; A constant velocity joint interposed between the main shaft and the spindle and connecting the main shaft and the spindle; Friction stir welding apparatus comprising an interpolation means for rotating the turning bracket provided on one side of the turning housing separately from the rotation of the main shaft. The method of claim 2, wherein the interpolation means, Servo motor for generating torque, An interpolation gear provided on the rotation shaft of the servomotor; And a turning gear which is provided in the turning housing and rotates in engagement with the interpolation gear and the tooth. The method of claim 3, wherein the spindle bracket, And a tilt is adjusted by an angle adjusting means fixedly mounted to connect one side of the turning bracket and one side of the spindle bracket. The method of claim 4, wherein the angle adjusting means, An upper fixing bracket fixed to the turning bracket A lower fixing bracket fixed to the spindle bracket and Friction stir welding device comprising an angle adjusting screw accommodated in the upper fixing bracket and the lower fixing bracket. The method of claim 2, And the main shaft and the spindle are splined to correspond to the internal shape of the constant velocity joint.

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