KR20140085760A - Stud welding device - Google Patents

Abstract

Provided is a stud welding apparatus capable of compressing a spring using a mechanical rotating force of a motor and easily operated by improving a structure to generate a spring compressive force. The stud welding apparatus comprises: a collet having a stud mounted thereon; a pressuring unit compressing the stud to a welded material by applying a welding force to the collet; and a moving unit separating the collet from the welded material. The pressuring unit includes a spring to apply compressive force of the spring to the collet. The moving unit includes: a driving motor applying rotating force; and a driving force converting unit connected to the driving motor and the spring compressed and eased with the rotating force of the driving motor.

Description

[0001] STUD WELDING DEVICE [0002]

The present invention relates to a welding apparatus. More specifically, the present invention relates to a stud welding apparatus used for joining a stud to a welded material.

In general, magnesium alloys have excellent machinability, high vibration damping ability, superior absorbability against vibration and impact, excellent electromagnetic wave shielding property, light weight, high non-strength, and can be formed as thin plate in terms of processing .

Accordingly, application of magnesium alloys to cases of electronic devices such as computers and mobile phones has been rapidly increasing. The electronics case requires a means to assemble the circuit board or internal components, but it is difficult to weld the boss because the thickness is thin and the heat conduction is fast. Therefore, stud welding by a capacitor discharge has been proposed.

The stud welding is useful for welding aluminum or magnesium alloy because welding is performed in a very short time by heating the surface and stud of the welded material by the arc heat generated between the pin and the welded material provided at the end of the stud.

Conventional capacitor welding and spaced stud welding are spring-loaded. In order to compress the spring, an electromagnetic force is used through the electromagnet coil. After the spring is compressed by using the electromagnet coil, the stud gun is fired, and when the charged capacitor is discharged, the pulsed current having a limited capacity is applied. Studs collide with welded material. At this time, the pin formed at the end of the stud is melted, evaporated and dissociated by the high current to generate arc plasma, and the surfaces of the stud and the welded material are preheated by the arc heat while being in contact with the fin.

A structure for generating a spring compressive force is improved to provide a more easily operated stud welding apparatus.

Further, there is provided a stud welding apparatus capable of compressing a spring using a mechanical rotational force of a motor.

The stud welding apparatus includes a collet on which a stud is mounted, a pressing portion for applying a pressing force to the collet to press the stud onto the welded material, and a moving portion for separating the collet from the welded material. The moving unit may include a driving motor for applying a rotational force and a power switching unit connected to the driving motor and compressing and decompressing the spring by a rotational force of the driving motor.

The stud welding apparatus may further include a stud feeder for storing at least one stud and providing the stud to the collet.

The stud feeder may include a cartridge for storing the stud, a conveying pipe connected to the cartridge to convey the stud, and a conveying block connected to the conveying pipe to place the conveyed stud.

The pressing portion includes a working rod which is installed at the upper end of the collet and extends outwardly, a housing through which the working rod penetrates, a sheet member installed in the operating rod and located in the housing, The spring may be a spring.

Wherein the power switching unit includes a housing having a space therein, a rotating shaft rotatably installed in the housing and connected to the driving motor, a screw plate provided on the rotating shaft in a spiral shape, And an actuating bar protruding from the side of the actuating rod and inserted into the housing through the slit and extending over the screw plate.

The screw plate may have a structure in which the screw plate is wound at an angle of less than 360 degrees in a spiral shape along the rotation axis and is opened between both ends along the circumferential direction of the rotation axis.

And between the both ends of the screw plate may be a structure in which the operating bar is larger than the width of the operating bar and is movable in the longitudinal direction of the rotating shaft between both ends of the screw plate.

The pressing portion may have a structure in which the moving distance of the operating rod in the housing is larger than an interval between the stud and the welded material.

The welded material or the stud may include aluminum or a magnesium material.

According to the present embodiment as described above, by using the rotational driving force of the motor for the compression force of the spring, the configuration of the equipment can be further simplified, and a more reliable operating environment can be created through the mechanical structure.

1 is a schematic diagram showing a stud welding apparatus according to the present embodiment.
2 is a schematic cross-sectional view showing a structure of a collet actuating part of a stud welding apparatus according to the present embodiment.
3 is a perspective view showing a part of the collet operating part of the stud welding apparatus according to the embodiment.
4 is a schematic plan view showing a collet operating part of a stud welding apparatus according to the present embodiment.
5 is a schematic view for explaining the operation of the collet actuating part of the stud welding apparatus according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Fig. 1 shows a stud welding apparatus according to the present embodiment, and Fig. 2 schematically shows a cross-sectional structure of a collet actuating part of the stud welding apparatus.

1, the stud welding apparatus 100 includes a collet 10 to which a stud S is mounted, a pressing unit 40 for pressing the collet 10 to press the stud S on the welded material P, (20), and a moving part (30) for separating the collet (10) from the welded material (P).

In the present embodiment, the stud welding apparatus can be used for welding the welded material P or the stud S made of aluminum or magnesium. The stud welding apparatus 100 may be fixed on a facility or mounted on an arm of a single-axis or single-axis or multi-joint robot and used for stud welding of a three-dimensional component.

In the present embodiment, the pressing portion 20 includes a spring 22 and applies a compressive force of the spring to the collet 10.

More specifically, the pressing portion 20 includes a working rod 24 installed at the upper end of the collet 10 and extending outwardly, a housing 26 through which the working rod 24 passes, And a spring 22 that is installed in the housing 26 and resiliently installed between the housing 26 and the sheet member 28. The sheet member 28 is provided in the housing 26,

When the studs S are mounted on the collet 10 and separated from the welded material P through the moving part 30, the spring 22 of the pressing part 20 is compressed, ). In this state, when the collet 10 is fired toward the welded material P, the stud S mounted on the collet 10 is pressed against the welded material P to be welded.

The collet 10 is formed of a material having excellent electrical conductivity such as copper, aluminum, or silver, and the lower end of the collet 10 is formed with a groove so that the stud can be mounted.

The apparatus also includes a stud feeder (40) for storing and providing at least one stud to the collet (10). The stud feeder 40 includes a cartridge 42 for storing the studs, a conveyance pipe 44 connected to the cartridge 42 to convey the studs, a stud S And a transfer block 46 in which a plurality of transfer blocks 46 are disposed. The stud feeder 40 feeds the studs stored in the cartridge 42 to the feed block 46 through the feed pipe 44 and the feed block 46 moves the studs stored in the cartridge 42, So that the collet 10 is moved to the lower portion of the collet 10 so that the collet 10 can mount the stud. The transfer block 46 moved to the lower part of the collet 10 lifts the supplied stud S and mounts it on the collet 10.

The collet 10 is moved in the vertical direction with respect to the welded material P and is spaced apart from the welded material P. The housing 26 is disposed on the upper end of the collet 10 and the operating rod 24 provided on the collet 10 extends upwardly through the center of the housing 26. A sheet member 28 provided on the operating rod 24 supports the lower end of the spring 22 inside the housing 26. When the operating rod 24 moves as the collet 10 moves up and down, the sheet member 28 is lifted upward and the spring 22 provided between the sheet member 28 and the inner upper end of the housing 26 is compressed, To the collet (10).

The moving unit 30 compresses the spring 22 while lifting the collet 10 to pull it from the welded material P and releases the compressed state of the spring 22 when necessary so that the material P to be welded, And the collet 10 is fired at a predetermined angle.

The welding apparatus of this embodiment has a structure in which compression and decompression of the spring 22 for generating the pressing force for emitting the collet 10 are performed through the rotational force of the driving motor.

The moving unit 30 includes a driving motor 31 for applying a rotational force and a driving force control unit 33 connected to the driving motor 31 and adapted to compress and decompress the spring 22 by the rotational force of the driving motor 31. [ And a switching unit.

The moving unit 30 may further include a control unit 32 for controlling the driving motor 31.

The power switching unit switches the rotational motion of the driving motor 31 to the linear motion of the operating rod 24 and moves the operating rod 24 up and down to compress or decompress the spring 22. [

2, the power switching unit includes a housing 33 having a space therein, a rotating shaft 34 rotatably installed in the housing 33 and connected to the driving motor 31, A slit 36 formed on the side surface of the housing 33 in the longitudinal direction so as to extend in the longitudinal direction and a slit 36 protruding from the side surface of the operating rod 24, And an operating bar 37 inserted into the housing 33 and extending above the screw plate 35.

The housing 33 is fixedly installed on the facility, and may be formed in a cylindrical shape, for example. A slit 36 is formed in the side surface of the housing 33 along the longitudinal direction and an operation bar 37 is inserted into the slit 36. The width of the slit 36 is approximately the same as the width of the actuating bar 37 so that the actuating bar 37 is only vertically movable from the slit 36. Thus, the operating rod 24 provided with the operating bar 37 is not rotated by itself, but only vertically movable along the slit 36.

A rotating shaft 34 provided with a screw plate 35 is installed inside the housing 33. The lower end of the rotary shaft 34 is supported at the lower end of the housing and the upper end extends upward through the upper end of the housing 33. A drive motor 31 is installed above the housing 33 and a drive shaft of the drive motor 31 is connected to an upper end of the rotation shaft 34.

Thus, when the drive motor 31 is rotated, the rotary shaft 34 rotates in the housing 33, and the screw plate 35 provided on the rotary shaft 34 rotates in one direction.

Here, the operating bar 37 extends through the slit 36 into the housing 33 and is placed on the screw plate 35. Accordingly, when the screw plate 35 is rotated, the operating bar 37 is gradually moved to the upper portion of the housing 33 along the surface of the screw plate 35 in association with the rotation of the screw plate 35.

The power switching unit converts the rotational motion of the driving motor 31 into the rectilinear motion of the operating bar 37 through the organic coupling structure of the screw plate 35 and the operating bar 37, The operating rod 24 provided with the spring 37 is linearly moved to press the spring 22.

The operation bar 37 is moved upward to the upper side of the housing 33 in accordance with the rotation of the screw plate 35 so that the operation rod 24 provided with the operation bar 37 is pulled up. Inside the housing 26, The sheet member 28 provided on the support member 24 rises upward to compress the spring 22.

Accordingly, the moving unit 30 moves the collet 10 to separate the welded material P, compresses the spring 22, and loads the collet 10 into the firing state.

In the present embodiment, the power switching unit is structured such that the operating rod 24 is raised to compress the spring 22, and the compression force of the spring 22 is released to fire the loaded collet 10.

3 and 4, the power switching unit is configured such that the screw plate 35 is wound on the rotary shaft 34 at an angle of less than 360 degrees in a spiral form and is wound around the rotary shaft 34 in the circumferential direction And the gap L between the tips is opened. For convenience of explanation, both ends of the screw plate 35 are referred to as an upper end 38 and a lower end 39, respectively. 4, the screw plate 35 is wound around the rotary shaft 34 less than one turn so that the upper end 38 and the lower end 39 of the screw plate 35 when viewed in the axial direction of the rotary shaft 34 Are not overlapped with each other, so that the interval L between them is opened.

The distance L between the lower end 39 and the upper end 38 of the screw plate 35 is larger than the width of the operating bar 37. In this embodiment, . When the operation bar 37 is positioned between both ends of the screw plate 35, it can move in the longitudinal direction of the rotation shaft 34 without interfering with the screw plate 35.

When the upper end of the screw plate 35 passes the operating bar 37 in a state where the operating bar 37 is moved along the screw plate 35 when the rotating shaft 34 is rotated over the housing 33, The operating bar 37 becomes movable through the gap L between both ends of the screw plate 35. As a result, Thus, the operating rod 24 provided with the operating bar 37 is movable up and down, and the collet 10 is fired toward the material P to be welded.

5, the driving of the driving motor 31 causes the rotation shaft 34 to rotate and the screw plate (not shown) provided on the rotation shaft 34 35) are turned in one direction. The operating rod 37 is lifted up along the inclined surface of the screw plate 35 provided in the form of a spiral on the rotating shaft 34 and the operating rod 24 is moved up and down along the screw plate 35 The spring 22 is compressed, and elasticity pressure is applied. When the operation bar 37 reaches the upper end of the screw plate 35 and the upper end of the screw plate 35 rotating with the spring 22 in the fully compressed state passes the operation bar 37, As the latching state is released, the compressed spring 22 resiliently returns and the operation rod 24 moves forward. The collet 10 provided on the operating rod 24 is fired toward the welded material P and the stud mounted on the collet 10 is strongly urged against the welded material P by the biasing force of the spring 22 Welding is done. After the collet is fired, the operation bar 37 is also lowered to the lower end of the screw plate 35, and the collet is moved again according to the rotation of the screw plate, Compression.

The moving distance A of the operating rod 24 in the housing 26 is larger than the distance B between the stud S and the welded material P. [ The moving distance A of the operating rod 24 is the moving distance of the collet 10 on which the stud is mounted since the collet 10 equipped with the stud S is installed in the operating rod 24. [ The moving distance of the operating rod 24 is defined as the moving distance of the operating rod 24 when the operating bar 37 reaches the upper end 38 of the screw plate 35 and the distance between the sheet member 28 and the housing 26 in the housing 26, And the distance between the inner lower ends. The operating rod 24 rises to the maximum when the operating bar 37 reaches the top of the screw bar and falls to the maximum when the sheet member 28 is located at the inner lower side of the housing 26, (24) is moved.

In order for the stud welding to be properly performed, the pins at the lower end of the stud (S) provided on the collet (10) are pressed against the surface of the welded material (P) to generate arc heat.

As described above, when the moving distance A of the operating rod 24 is made larger than the distance B between the pin at the lower end of the stud and the welded material P as described above, The stud S is brought into contact with the workpiece P before reaching the workpiece W. As a result, the operating rod can be further lowered above the interval B, and the pin of the stud S can be sufficiently pressed so as to be embedded in the welded material P.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

10: Collet 20:
22: spring 24: working rod
26: housing 28: sheet member
30: moving part 31: driving motor
32: control unit 33: enclosure
34: rotating shaft 35: screw plate
36: slit 37: actuating bar
40: Stud feeder 42: Cartridge
44: Feed pipe 46: Feed block

Claims (8)

A collet to which the stud is mounted, a pressing portion for pressing the stud against the welded material by applying a pressing force to the collet, and a moving portion for moving the collet away from the welded material,
Wherein the pressing portion comprises a spring including a spring for applying a compressive force of the spring to the collet, the moving portion includes a driving motor for applying a rotational force, a power switching means connected to the driving motor for compressing and decompressing the spring by a rotational force of the driving motor, Wherein the stud welding device comprises: The method according to claim 1,
Wherein the stud welding apparatus further comprises a stud feeder for storing and providing at least one stud to the collet. 3. The method of claim 2,
Wherein the stud feeder includes a cartridge for storing a stud, a feed pipe connected to the cartridge and to which the stud is fed, and a feed block connected to the feed pipe for feeding the stud. 4. The method according to any one of claims 1 to 3,
The pressing portion includes a working rod which is installed at an upper end of the collet and extends outward, a housing through which the working rod passes, a sheet member installed in the operating rod and located in the housing, A stud welding device comprising a spring. 5. The method of claim 4,
Wherein the power switching unit includes a housing having a space therein, a rotating shaft rotatably installed in the housing and connected to the driving motor, a screw plate disposed in a spiral shape on the rotating shaft, a slit formed in a longitudinal direction of the housing, And an actuating bar protruding from the side of the actuating rod and inserted into the housing through the slit to extend over the screw plate. 6. The method of claim 5,
Wherein the screw plate is wound at an angle of 360 degrees or less in a spiral shape along a rotation axis and is opened between both ends along the circumferential direction of the rotation axis. The method according to claim 6,
Wherein the operating bar is larger in width between the both ends of the screw plate than the operating bar and is movable in the longitudinal direction of the rotating shaft between both ends of the screw plate. 8. The method of claim 7,
Wherein the pushing portion has a structure in which the moving distance of the operating rod in the housing is larger than an interval between the stud and the welded material.

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