KR102115527B1 - Laser spot welding apparatus - Google Patents

Abstract

The laser spot welding apparatus according to the present invention includes: a base frame on which a driving member is installed; An elevating frame connected to the driving member and elevating by the driving member; A laser head installed on the elevating frame and emitting a laser beam to a target object; A holding unit connected to the lifting frame so that the laser beam passes through the hollow, and pressing and holding the upper surface of the object to be welded; And a clamp arm supporting the lower surface of the object to be welded and configured to be detached from the base frame.

Description

Laser spot welding device {LASER SPOT WELDING APPARATUS}

The present invention relates to a laser spot welding apparatus, which is a laser spot welding apparatus for spot-welding an object to be welded with a laser beam.

Conventional resistance point welding (electrical resistance welding) is a structure in which electricity is passed through a base material between upper and lower electrodes (welding tips) by using electricity to perform welding (welding).

However, when the gap between the base material (iron) and the base material (iron) is widened or a gap is generated, the current does not pass and welding does not occur or the quality of welding is deteriorated.

In order to solve this problem, the conventional resistance point welding (electric resistance welding) is a structure in which the upper electrode (welding tip) is pressed to adhere and weld (bond) electricity through electricity while pressing and attaching a base material having a gap or a gap therebetween. An electrode cylinder for elevating the upper electrode is installed and welded.

On the other hand, laser welding is a structure in which a base material is melted by using a laser beam, and then the base material is melted and the molten base material, that is, a groove made of iron, is bonded (welded) in a manner.

However, when the gap between the base material and the base material is opened or a gap is generated in the laser welding, welding is performed in an open state, thereby causing a problem of deteriorating the welding quality.

In order to solve this problem, laser welding is performed by sequentially installing the clamps of multiple clamps to close the gap between the base material and the base material by sequentially operating the closing of the installed clamps. Welding is performed on the stuck part.

In this case, in order to fill the gap of the base material, an expensive fixing device (jig) with a clamp must be installed separately.

In addition, since laser welding emits a high-intensity beam to melt the base material, as a safety problem that is harmful to the human body that becomes blind when a laser beam is faced occurs, a safety booth, an enclosed space, is installed to solve this problem. Welding should be carried out. In this case, an expensive safety booth should be installed in accordance with international standards.

Therefore, problems such as cost increase, workability, and productivity decrease due to the additional installation of separate fixing devices and safety booths occur.

To solve this problem, a newly developed technique is laser spot welding that combines resistance spot welding and laser welding.

Specifically, the laser spot welding apparatus capable of performing laser spot welding is a safety booth for blocking high-intensity light emitted by a laser beam, and a holding unit implemented by applying a shank portion of the resistance spot welding apparatus is configured, and also a resistance The clamp arm of the clamp structure is constructed by applying the fixing jig of the spot welding device.

However, the conventional laser gun welding apparatus having a welding gun structure has a disadvantage in that it is difficult to separate a clamp arm interfering with the object to be welded with a closed structure. That is, the conventional laser spot welding apparatus has a disadvantage in that it is quite difficult in terms of high weight and dismantling structure to separate the clamp arm provided with the cylinder apparatus.

On the other hand, the conventional laser spot welding apparatus has a problem in that laser welding gas and welding foreign matter are contaminated in the laser optical lens, resulting in a defect in laser welding as a focal abnormality occurs in the laser optical lens requiring high precision. .

Republic of Korea Registered Patent Publication No. 10-0745295

The present invention has been devised to solve the above problems, and it is possible to easily weld a to-be-welded object having a closed structure, and to provide a laser spot welding device that prevents laser welding defects by blocking contamination of the laser optical lens. It has its purpose.

In order to achieve the above object, a laser spot welding apparatus according to an embodiment of the present invention includes: a base frame on which a driving member is installed; An elevating frame connected to the driving member and elevating by the driving member; A laser head installed on the elevating frame and emitting a laser beam to the object to be welded; A holding unit connected to the lifting frame so that the laser beam passes through the hollow, and pressing and holding the upper surface of the object to be welded; And a clamp arm supporting the lower surface of the object to be welded and configured to be detached from the base frame.

Here, the clamp arm is formed with a vertical fastening groove in the upper end, the base frame and the clamp arm are connected by an arm bracket, the arm bracket, a frame fastening part detachable to the base frame; A vertical arm fastening part protruding from the frame fastening part and inserted into the vertical fastening groove and fastened to the clamp arm by a fastening member; And a horizontal lower reinforcement part protruding from the lower end of the frame fastening part and connected to the lower end of the vertical arm fastening part to prevent the vertical arm fastening part from being prevented.

At this time, the arm bracket, while protruding from the upper end of the frame fastening section connected to the upper end of the vertical arm fastening section; further comprising, the horizontal upper stiffening section, vertical arm fastening section, and horizontal lower end connected to each other sequentially The reinforcing portion may be made of an I-type structure as a whole.

In addition, the frame fastening part, the fastening part of the base frame to which the frame fastening part is fastened, and the vertical arm fastening part and the fastening part of the clamp arm to which the vertical arm fastening part is fastened, a pinhole into which a positioning pin is inserted. This is formed, a fastening hole into which the fastening member is inserted may be formed.

And, the base frame, an upper stopper may be mounted on the upper portion to limit the elevation of the lifting frame.

In addition, a cushioning member may be mounted on the upper portion of the elevating frame so that the laser head is buffered when the elevating frame is raised and collides with the upper stopper.

In addition, the base frame, the lower stopper may be mounted to the lower portion to limit the lowering of the lifting frame.

Further, the holding unit is installed with a plurality of proximity sensors spaced apart at regular intervals along the edge of the bottom surface to detect that the bottom surface is in surface contact with the object to be welded, and the driving member is electrically connected to the proximity sensor When sensing the proximity sensor, the holding frame may be controlled to stop after decreasing the descending speed.

Meanwhile, a protective lens unit may be disposed between the laser head and the holding portion to protect the laser optical lens from laser welding gas and welding foreign matter flowing through the holding portion to the laser optical lens side of the laser head.

Specifically, the protective lens unit, a first protective lens mounted on the lower end of the laser head; And a second protection lens disposed under the first protection lens and installed between the laser head and the holding portion in the lifting frame.

At this time, the second protective lens is detachably mounted to the lifting frame, and a cover for covering the lifting frame may be formed to open and close a lens replacement tool through which the second protective lens passes.

The laser spot welding apparatus according to the present invention is configured such that the clamp arm is detachably attached to the base frame in the installation condition in which the driving member providing the driving force to press the object to be welded is mounted on the base frame, which is the upper component, not the lower clamp arm. By doing so, the clamp arm is removed from the base frame, and the object to be welded having a closed structure can be easily welded.

In addition, in the laser spot welding apparatus according to the present invention, the arm bracket has a horizontal upper reinforcement portion, a vertical arm coupling portion, and a horizontal lower reinforcement portion sequentially connected to each other to form an I-type structure, whereby the clamp arm is clamped vertically. It has the advantage of ensuring the durability of the arm bracket by reinforcing the arm fastening.

In addition, the laser spot welding apparatus according to the present invention, the upper stopper and the lower stopper are configured to limit the elevating of the elevating frame, thereby preventing the lowering of the holding portion installed in the elevating frame and the upward movement of the laser head, and the elevating frame. Since the shock absorbing member is configured, the impact of the laser head due to the stop impact of the lifting frame can be alleviated, and ultimately it has the effect of safely protecting the laser head and maintaining the laser welding quality.

In addition, the laser spot welding apparatus according to the present invention can be prevented from being contaminated by the laser welding gas and the welding foreign matter through the holding portion, the protective lens unit, specifically, the protective lens unit is the first It consists of a double protection structure consisting of a protective lens and a second protective lens and is configured to be detached from the second protective lens. As the second protective lens is easily removed and cleaned, it is possible to ultimately maintain the laser welding quality. Have.

1 is a view showing that the laser spot welding apparatus according to the present invention is installed on the robot arm.
FIG. 2 is a view showing the laser spot welding apparatus of FIG. 1.
3 is a view showing that the cover is removed from the laser spot welding apparatus of FIG. 2.
FIG. 4 is a view showing that the laser spot welding apparatus of FIG. 2 welds an object to be welded having a closed structure.
5 is a view showing that the arm bracket and the clamp arm are disassembled in the laser spot welding apparatus of FIG. 2.
FIG. 6 is a view showing the arm bracket of FIG. 5.
7 is a view showing the base frame and the lifting frame in the laser spot welding apparatus of FIG. 3.
8 is an enlarged view of a portion in which the protective lens unit is installed in the laser spot welding apparatus of FIG. 3.
FIG. 9 is a view showing that the second protective lens is removed through the lens replacement tool of the cover in the laser spot welding apparatus of FIG. 2.
10 is a perspective view showing a holding portion in the laser spot welding apparatus of FIG. 2.
11 is an exploded perspective view showing the holding portion of FIG. 10.
12 and 13 are longitudinal sectional views showing the holding portion of FIG. 10.
14 and 15 are views showing the holder member of the holder unit in the holding portion of Figure 10.
16 and 17 are views showing the holder extension member of the holder unit in the holding portion of FIG. 10.
18 and 19 are views showing a body member of the body unit in the holding portion of FIG. 10.
20 and 21 are views illustrating a body extension member of the body unit in the holding portion of FIG. 10.

Hereinafter, it will be described in detail through exemplary drawings of the present invention. Note that when adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in the description of the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

1 is a view showing that the laser spot welding apparatus according to the present invention is installed on a robot arm, FIG. 2 is a diagram showing the laser spot welding apparatus of FIG. 1, and FIG. 3 is a cover removed from the laser spot welding apparatus of FIG. 2 It is a drawing showing what has been done.

Referring to the drawings, the laser spot welding apparatus 1000 according to the present invention is installed on the robot arm R, and the position and angle can be adjusted by the operation of the robot arm R.

The laser spot welding apparatus 1000 includes a base frame 11, a lifting frame 13, a laser head 14, a holding unit 100, and a clamp arm 210.

Here, the base frame 11 is provided with a driving member 12.

In addition, the lifting frame 13 is connected to the driving member 12 and takes a structure that is elevated by the driving member 12.

In addition, the laser head 14 is installed on the elevating frame 13, and has a function of emitting a laser beam to the object to be welded. An optical cable C for supplying a laser beam is connected to the laser head 14.

Then, the holding part 100 is connected to the lifting frame 13 so that the laser beam passes through the hollow. That is, the holding part 100 is installed in the lifting frame 13 so that the hollow faces each other in a straight line with the laser beam emitting part of the laser head 14.

The holding unit 100 is interlocked and elevated according to the elevation of the elevating frame 13, while descending and moving toward the clamp arm 210, the upper surface of the object to be welded disposed between the clamp arm 210 is pressed and held. Play a role.

In addition, the clamp arm 210 is installed on the base frame 11, and takes a structure to support the lower surface of the object to be welded.

The clamp arm 210 is installed in a portion spaced apart from the holding portion 100 in the base frame 11 and extends in parallel with the holding portion 100 and takes a shape bent toward the end side of the holding portion 100. .

Specifically, the clamp arm 210 is configured to be attached to and detached from the base frame 11, whereby the laser spot welding apparatus 1000 according to the present invention can easily weld the object to be welded 1 having a closed structure. have.

Conventional welding gun (laser spot welding) device of the welding gun structure, the upper structure with the laser head is a precise part is used to be fixed to the frame, on the other hand, by taking the structure to move the lower structure with a clamp arm, As the cylinder device for moving in the vertical direction is installed on the clamp arm, it is difficult to separate the clamp arm provided with the cylinder device in terms of high weight and dismantling structure.

However, in using a conventional laser spot welding apparatus having such a drawback, when welding a welded object having a closed structure, the clamp arm cannot interfere with the closed structure of the welded object, and thus cannot be drawn into the closed structure. .

Due to the interference of the clamp arm, the conventional laser spot welding apparatus cannot perform the closed section welding of the object to be welded, so the clamp arm provided with the cylinder device must be separated for welding. In addition, as the dismantling structure is a complicated structure, welding work is very inefficient due to the considerable time and workload required for the separation work.

To overcome this limitation, the laser spot welding apparatus according to the present invention is configured such that the clamp arm 210 is detachably attached to the base frame 11.

That is, in the laser spot welding apparatus according to the present invention, if the clamp arm 210 is fixed to the base frame 11, as shown in FIG. 4(a), it interferes with the closed structure of the object 1 to be welded. Since welding cannot be performed, the clamp arm 210 is easily removed from the base frame 11 so that the to-be-welded object 1 having a closed structure can be easily welded.

Accordingly, in the laser spot welding apparatus of the present invention, even if the clamp arm 210 is removed from the base frame 11, the driving member 12 that provides the driving force to press the object to be welded is not held on the clamp arm 210 side. Since it is installed on the side of the part 100, as shown in Figs. 4(b) and 4(c), the laser spot welding can be performed by adhering to the object to be welded while the holding part 100 moves downward.

Then, the fastening structure of the clamp arm 210 with respect to the base frame 11 will be described with reference to FIGS. 5 and 6.

The base frame 11 and the clamp arm 210 are connected by an arm bracket 220, wherein the arm bracket 220 is a frame fastening part 221, a vertical arm fastening part 222, and a horizontal lower reinforcement part ( 223).

Here, the frame fastening portion 221 takes a structure that is detachable to the base frame 11, as an example, as shown in the drawing takes a panel shape to be stably interviewed on one side of the base frame 11 .

At this time, the frame fastening portion 221 and the fastening portion of the base frame 11 to which the frame fastening portion 221 is fastened, pin holes 221a and 11c into which a positioning pin (not shown) is inserted are formed. And, a fastening member (not shown), such as a bolt, may be formed with fastening holes 221b and 11d.

When the frame fastening portion 221 is fastened to the base frame 11, first, the pinhole 221a of the frame fastening portion 221 is faced to the pinhole 11c of the baseframe 11, and then the positioning pin is pinhole. By being inserted into (221a) (11c), the arm bracket 220 is fixed to the base frame 11 by being fixed, and then the fastening member is inserted into the fastening hole 221b, 11d and tightened (or together with a nut) ) Finally, the arm bracket 220 is fastened to the base frame 11.

Then, the vertical arm fastening portion 222 protrudes from the frame fastening portion 221, and is inserted into the vertical fastening groove 210a formed at the upper end of the clamp arm 210 to be fastened with the clamp arm 210 by a fastening member. .

That is, the vertical arm fastening part 222 takes a structure protruding from the frame fastening part 221 to be perpendicular to the frame fastening part 221 and is inserted into the vertical fastening groove 210a of the clamp arm 210 to clamp It is assembled with the arm 210.

At this time, the vertical arm fastening portion 222 and the clamping portion of the clamp arm 210 to which the vertical arm fastening portion 222 is fastened, pinholes 222a and 210b into which a positioning pin (not shown) is inserted are formed. And, a fastening hole (222b) 210c into which a fastening member (not shown) is inserted may be formed.

When the clamp arm 210 is fastened to the vertical arm fastening portion 222, the pin hole 210b of the clamp arm 210 is first faced to the pin hole 222a of the vertical arm fastening portion 222, and then the positioning pin is pinhole. By being inserted into (222a) (210b), the clamp arm 210 is suspended and fixed to the arm bracket 220, and then the fastening member is inserted into the fastening hole 222b, 210c and tightened (or together with a nut) ) Finally, the clamp arm 210 is fastened to the arm bracket 220.

In addition, the horizontal lower reinforcement part 223 protrudes from the lower end of the frame fastening part 221 and takes a structure connected to the lower end of the vertical arm fastening part 222, thereby serving to prevent the vertical arm fastening part 222 from being prevented. do.

If the clamp arm 210 is a high-load heavy object having a substantially significant weight and is fastened only to the vertical arm fastening portion 222 of the arm bracket 220, the vertical arm fastening portion ( Since 222) may be damaged, the horizontal lower stiffening portion 223 is formed integrally with the lower end of the vertical arm fastening portion 222 to reinforce the durability of the arm bracket 220.

In addition to this, the arm bracket 220 may further include a horizontal upper reinforcement 224.

Here, the horizontal upper reinforcing part 224 protrudes from the upper end of the frame fastening part 221 and takes a structure connected to the upper end of the vertical arm fastening part 222.

If the clamp arm 210 is fastened only to the vertical arm fastening portion 222 of the arm bracket 220, the vertical arm fastening portion 222 may be damaged as a large load is applied to the vertical arm fastening portion 222, so that the horizontal The upper reinforcing part 224 is also formed integrally with the upper end of the vertical arm fastening part 222 to reinforce the durability of the arm bracket 220, like the horizontal lower reinforcing part 223.

The horizontal upper stiffener 224, the vertical arm fastener 222, and the horizontal lower stiffener 223, which are configured as described above, are sequentially connected to each other, thereby forming an I-type structure as a whole, arm bracket 220. The durability of can be secured.

On the other hand, with respect to the structure configured to elevate the lifting frame 13, the laser head 14 is installed on the base frame 11, it will be described with reference to Figures 1 to 3.

The base frame 11 is equipped with a driving member 12 on the upper portion, and the lifting frame 13 is connected to the driving member 12 so that the lifting frame 13 is lifted by the operation of the driving member 12. Reciprocating motion is realized. At this time, the lifting frame 13 is provided with a laser head 14 and a holding unit 100, so as to interlock with the lifting of the lifting frame 13, the laser head 14 and the holding unit 100 are also elevated.

Here, in order to maintain the precision of the welding position when the laser welding is performed, the drive member 12 is preferably a servo cylinder used to control the contact position and the pressing force for an accurate and constant object to be welded.

That is, the drive member 12 has a servo function added to the inside so that the holding part 100 can move at a high speed when moving up and down, and increase the pressing force while moving at a low speed when the object to be welded is pressed. Servo cylinder can be used.

In addition, a guide bar (G) is mounted on the base frame (11), and the guide bar (G) is installed such that the lifting frame (13) slides and serves to guide the lifting of the lifting frame (13).

And, the base frame 11, as shown in Figures 3 and 7, the upper stopper (11a) and the lower stopper (11b) is mounted, the lifting frame 13 is equipped with a buffer member (13a) Can be.

Here, the upper stopper (11a) is mounted on the upper portion of the base frame 11 to limit the elevation of the lifting frame 13, the lower stopper (11b) is a base frame to limit the lowering of the lifting frame (13) It can be mounted on the lower portion of (11).

That is, the upper stopper (11a) and the lower stopper (11b) by limiting the rise and fall of the elevating frame 13, the lowering of the holding portion 100 installed in the elevating frame 13 and the rise of the laser head (14) It plays a role of preventing over-moving.

In addition, the cushioning member 13a may be mounted on the upper portion of the elevating frame 13 so that the laser head 14 is buffered when the elevating frame 13 rises and collides with the upper stopper 11a.

The conventional gun-shaped laser spot welding apparatus is fixed to the frame because the upper configuration with the laser head is a precise part, while the lower configuration with the clamp arm has a cylinder device and takes a structure for lifting. In the laser spot welding apparatus according to the present invention, the clamp arm 210 is not provided with a cylinder device, and a driving member 12 is provided in an upper configuration with a laser head 14 to take up and down.

Accordingly, in order to protect the laser spot welding apparatus of the present invention from impact caused by movement, the laser spot welding apparatus of the present invention is equipped with a shock absorbing member 13a on the lifting frame 13 on which the laser head 14 is installed. Can be.

At this time, the cushioning member 13a is disposed on the upper portion of the elevating frame 13 in order to alleviate the impact generated when the elevating frame 13 is raised.

For reference, the shock absorbing member 13a may be a member capable of absorbing shock in a material such as rubber, or a member capable of absorbing shock in a structure such as a spring may be used.

Then, the control of the drive member 12 may be set so as to alleviate the impact generated when the lifting frame 13 descends.

In the laser spot welding apparatus of the present invention, when the welding object is welded, the driving member 12 is operated to lower the elevating frame 13, so that the holding part 100 mounted on the elevating frame 13 interlocks down to the object to be welded. After moving, press the object to be welded with an appropriate force.

In this way, when the holding part 100 is in contact with the object to be welded, the impact may be applied to the laser head 14, so that the driving member 12 can be controlled to alleviate the impact.

Specifically, the holding unit 100 is installed with a plurality of proximity sensors spaced apart at regular intervals along the edge of the bottom surface, so as to detect that the bottom surface is in contact with the object to be welded.

At this time, the drive member 12 is electrically connected to the proximity sensor, and when sensing the proximity sensor, the holding frame 100 may be controlled to stop after the descending speed is reduced.

Accordingly, the speed of the elevating frame 13 is reduced from the time when the holding part 100 comes into contact with the object to be welded, so that the impact received by the laser head 14 can be adequately alleviated.

For reference, a specific installation structure for the proximity sensor will be described later.

Meanwhile, the laser spot welding apparatus according to the present invention may further include a protective lens unit 300 as shown in FIGS. 8 and 9.

The protective lens unit 300 is provided with a protective lens unit 300 between the laser head 14 and the holding unit 100.

The protective lens unit 300 uses a laser optical lens (not shown) embedded in the laser head 14 from the laser welding gas and welding foreign matter flowing to the laser optical lens side of the laser head 14 through the holding unit 100. It serves to protect.

That is, when contamination by laser welding gas and welding foreign matter occurs in the laser optical lens, a focal abnormality may occur in the laser optical lens requiring high precision, and as the laser welding failure may occur, the protective lens unit 300 By blocking the laser welding gas and welding foreign matter flowing toward the laser optical lens side, it is possible to prevent contamination of the high-precision laser optical lens to maintain the laser welding quality.

Specifically, the protective lens unit 300 is provided with a first protective lens 310 and a second protective lens 320, it can take a double protection structure for the laser optical lens.

At this time, the first protective lens 310 is mounted on the lower end of the laser head 14, that is, the portion where the laser beam is emitted from the laser head 14.

In addition, the second protective lens 320 is disposed under the first protective lens 310 and is installed between the laser head 14 and the holding unit 100 in the elevating frame 13.

As described above, the protective lens unit 300 may also be configured as one protective lens, but preferably, as described above, the first protective lens 310 and the second protective lens 320 may be provided.

This is because the first protective lens 310 has a structure mounted on the laser head 14, when the first protective lens 310 is separated for cleaning, disassembly from the laser head 14 is not easy, and the laser Since the setting of the precise laser head 14 can be changed when dismantling from the head 14, and further there is a high risk of damage, it is preferable that the protective lens unit 300 further includes a second protective lens 320. .

The second protective lens 320 may be detachably mounted on the elevating frame 13.

Accordingly, when the second protective lens 320 is contaminated by laser welding gas and welding foreign matter, it may be removed from the elevating frame 13 by an operator and cleaned or replaced.

At this time, the second protective lens 320 can be easily dismantled even during disassembly by assembling the lifting frame 13 through a fastening member such as a bolt.

For reference, the first protective lens 310 protects the laser optical lens in a state in which the second protective lens 320 is removed, and also the laser welding gas that enters into the minute gap of the device without passing through the holding unit 100. It serves to protect the laser optical lens from welding contaminants and various contaminants.

In addition, the second protective lens 320 has a second protective lens 320 on the cover 400 covering the lifting frame 13 so as to be easily detachable while the cover 400 is covered on the lifting frame 13. The lens replacement sphere (400a) through which it may pass may be formed to open and close.

Accordingly, when the second protective lens 320 is separated from the elevating frame 13, it may be removed by the operator through the lens replacement tool 400a of the cover 400 and cleaned or replaced.

For reference, the closing of the lens replacement tool 400a is made by an opening/closing door, and the shape and installation structure of the opening/closing door are not limited by the present invention and any conventional shape and installation structure can be utilized.

As a result, in the laser spot welding apparatus according to the present invention, the driving member 12 providing the driving force to press the object to be welded is installed on the base frame 11, which is the upper configuration, not the clamp arm 210, which is the lower configuration. Under the condition, the clamp arm 210 is configured to be detached from the base frame 11, so that the clamp arm 210 is easily removed from the base frame 11 and the welded object 1 having a closed structure is easily welded. Can be.

In addition, in the laser spot welding apparatus according to the present invention, the arm bracket 220 has a horizontal upper stiffener 224, a vertical arm fastener 222, and a horizontal lower stiffener 223 sequentially in the frame fastening unit 221. As it is connected to each other and is made of an I-type structure, the durability of the arm bracket 220 can be secured by reinforcing the vertical arm fastening portion 222 to which the clamp arm 210 is fastened.

In addition, the laser spot welding apparatus according to the present invention, the upper stopper (11a) and the lower stopper (11b) is configured to limit the lifting of the lifting frame 13, so that the holding portion 100 installed in the lifting frame (13) It prevents the movement of the descent and the rise of the laser head 14, and the shock absorbing member 13a is configured in the lifting frame 13, so that the laser head 14 receives the shock from the impact when the lifting frame 13 is stopped. It can alleviate the, and can ultimately secure the laser head 14 and maintain the laser welding quality.

And, the laser spot welding apparatus according to the present invention, the protective lens unit 300 is configured, it is possible to prevent the laser optical lens from being contaminated by the laser welding gas and welding foreign matter through the holding unit 100, specifically As the protective lens unit 300 is made of a double protective structure consisting of the first protective lens 310 and the second protective lens 320, and the second protective lens 320 is configured to be detached, the second protective lens 320 ) Is easily removed and cleaned, which can ultimately maintain the laser welding quality.

On the other hand, with respect to the holding portion 100 in the laser spot welding apparatus according to the present invention, with reference to FIGS. 10 to 21 will be described in detail as follows.

The holding part 100 is composed of a body unit 110 and a holder unit 120, which is a part corresponding to the clamp arm 210 on which the object to be welded is seated in the variable length laser spot welding device, wherein the object to be welded is the clamp arm. When seated and supported on the 210, it descends to press and hold the object to be welded.

Here, the body unit 110 is connected to the elevating frame 13, the laser beam is passed, it may be formed in a modular form for each part so that the length is variable according to the focal length of the laser beam.

That is, the body unit 110 is a unit for enclosing and sealing a beam route that moves to a certain distance in order for the laser beam to be focused on the object to be welded, and the length may be varied according to the focal length of the ray point beam.

To this end, the body unit 110 forms a modular structure for each part, so that parts of each part can be easily detached from each other, and at the same time, the total length can be changed according to the number of parts.

In other words, when the focal length of the ray point beam is relatively long, the body unit 110 connects a relatively large number of parts to each other, and when the focal length of the laser beam is relatively short, a relatively small number of parts. As they can be connected to each other, the length can be smoothly and easily varied to correspond to the focal length of the ray point beam.

Specifically, the body unit 110 may include a body member 111 and a body extension member 112.

Here, the body member 111 is formed with a body hollow (111h) through which the laser beam passes, one end is installed on the lifting frame (13).

In addition, the body extension member 112 is in communication with the body hollow (111h) of the body member 111 is formed a body extension hollow (112h) through which the laser beam passes, the other end of the body member 111 as a modular At least one or more are connected.

The number of body extension members 112 connected to the body member 111 varies according to the focal length of the ray point beam.

That is, when the focal length of the laser beam is relatively short, one of the body extension members 112 may be connected to the body member 111, and when the focal length of the ray point beam is relatively long, a plurality of body members ( 111), the overall length of the body unit 110 can be varied according to the focal length of the laser beam.

Of course, in this case, when the focal length of the ray point beam is very short, the body unit 110 is not connected to the body extension member 112, and only the body member 111 may be connected to the lifting frame 13 and used.

Then, the assembly structure in which a plurality of bodies are assembled to each other in the body extension member 112 that implements the variable length of the body unit 110 will be described.

The body extension member 112 may have a body extension assembly groove 112b formed at one end and a body extension assembly protrusion 112a formed at the other end so that one end of the body extends with each other.

Accordingly, the body extension assembly protrusion 112a of the other body extension member 112 may be inserted and assembled into the body extension assembly groove 112b, and the body extension assembly protrusion 112a may have a different body extension member 112 ) Can be assembled by being inserted into the body extension assembly groove 112b.

At this time, as the body extension member 112 takes a rectangular cylinder structure, as shown in the drawing as a preferred example for a stable and robust assembly structure, body extension assembly protrusions 112a are formed at each corner of one end. The body extension assembly groove 112b may be formed at each corner of the other end.

As described above, the body extension member 112 has a shape in which one end and the other end are matched with each other, that is, corresponding to each other, which causes one end of the body extension member 112 to be different from the other body extension member 112 ) Is assembled with the other end of the body and the other end of the body extension member 112 is assembled with one end of the other body extension member 112, a plurality of body extension members 112 can be conveniently assembled and disassembled with respect to each other It can be used without pre- and post-separation, and it can take a convenient modular assembly structure that can be used regardless of the connection order to each other. Furthermore, due to this convenient modular detachable structure, maintenance can be efficiently performed when parts are damaged. .

For reference, it is needless to say that the plurality of body extension members 112 are firmly fastened with separate fastening members such as bolt members after being assembled to each other.

And, at the other end of the body member 111, as shown in the drawing body assembly protrusion 111a is inserted into the body extension assembly groove 112b of the body extension member 112 is assembled or formed, although the drawing Although not shown, a body assembly groove into which the body extension assembly protrusion 112a of the body extension member 112 is inserted and assembled may be formed. Accordingly, the modular body extension member 112 is also provided to the body member 111. Can be conveniently assembled and disassembled.

Furthermore, the holder unit 120, which will be described later, includes a holder extension member 122 and a holder member 121 sequentially connected from the body extension member 112, wherein the holder extension member 122 is assembled with the holder extension at one end. A groove 122b is formed, a holder extension assembly protrusion 122a is formed at the other end, and a holder assembly groove 121a is formed at one end of the holder member 121, and the body extension is extended at the holder extension assembly groove 122b. The body extension assembly protrusion 112a of the member 112 is inserted and assembled, and the holder extension assembly protrusion 122a is inserted and assembled into the holder assembly groove 121a of the holder member 121, thereby assembling the holder unit 120. The holder extension member 122 and the holder member 121 can also be conveniently and easily assembled to the body extension member 112 of the body unit 110, and maintenance and repair are efficiently performed when parts are damaged due to such a simple detachable structure. It can be done.

Meanwhile, at least one of the body member 111 and the body extension member 112 may be provided with a forced air discharge unit 113 and an air injection unit 114.

When the laser welding of the object to be welded, welding fume and spatter are generated, wherein the welding fume is a solid substance in which metal is dissolved and vaporized into a gaseous substance and condensed again after gas, and the spatter is a slag that scatters during welding. I refer to metal grains.

The welding fume is contained in the air and flows into the holder unit 120 and the body unit 110, and the spatter is scattered at the welding site and flows into the holder unit 120 and the body unit 110, and the laser beam is used for this welding fume. The welding efficiency is lowered by being interfering and dispersing by and spatter, and contaminating and damaging the expensive lens embedded in the laser head 14.

The forced air discharge unit 113 discharges the welding fume and spatter to the outside of the holder unit 120 and the body unit 110, and the air injection unit 114 discharges the welding fume and spatter forcibly. By introducing the air curtain to block the welding fume and spatter from reaching the lens of the laser head 14 at the same time as being guided to the unit 113, the welding efficiency can be increased and the lens of the laser head 14 can be protected. .

Then, first to structurally describe the forced air discharge unit 113, the forced air discharge unit 113 is formed on at least one side of the body member 111 and the body extension member 112, air It takes a structure connected with an inhaler (not shown) with a hose.

In detail, the forced air discharge unit 113 sequentially passes through the holder hollow 121h of the holder member 121 and the holder extension hollow 122h of the holder extension member 122 from the welding region while the body extension member 112 ) To implement a discharge flow path for discharging welding fume flowing into the body extension hollow 112h and the body member 111 body hollow 111h.

At this time, although the air inhaler is not shown in the drawing, it is connected to the forced air discharge unit 113, thereby effectively removing the welding fume on the root of the laser beam by sucking the welding fume through the forced suction method.

In addition, the air injection unit 114 is formed on the other side of at least one of the body member 111 and the body extension member 112, the forced air discharge unit 113 is formed, the air toward the forced air discharge unit 113 It is configured to spray.

In practice, the forced air discharge unit 113 may be provided on the body unit 110 independently of the air injection unit 114, but unlike this, the air injection unit 114 may be provided with the forced air discharge unit 113 ) And one set, it is preferable to allow the air injected into the body unit 110 to smoothly exit the body unit 110 through the air injection unit 114.

Further, at least one other side of the body member 111 and the body extension member 112 on which the air injection unit 114 is formed, air from the front and rear sides of the air injection unit 114 based on the passage direction of the laser beam. The natural air discharge unit 115 through which natural discharge is performed may be formed.

The natural air discharge portion 115 is a hole structure, and due to the vortex generated at the front and rear sides of the air curtain formed by the air injection portion 114, welding fume and spatter that are not discharged to the forced air discharge portion 113 side It naturally discharges, and also performs an auxiliary air discharge function together with the forced air discharge part 113, and further performs an air discharge function as a safety means when the temporary function of the forced air discharge part 113 is deteriorated or stopped.

For reference, the natural air discharge unit 115 may be provided with a shield member 115a to open in the vertical direction so as not to expose the laser beam from the outside.

Meanwhile, referring to FIGS. 1 to 13 and FIGS. 18 to 21 for the holder unit 120 in the holding unit 100, it will be described in detail as follows.

18 and 19 are views showing the holder member of the holder unit in the holding portion of FIG. 10, and FIGS. 20 and 21 are views showing the holder extension member of the holder unit in the holding portion of FIG.

Referring to the drawings, the holder unit 120 is a portion that is connected to the end of the body unit 110 and is in contact with the object to be welded, through which the laser beam passes and has a smaller cross-sectional area than the body hole 11h of the body unit 110. The holder hole 120h is formed.

The holder unit 120 is equipped with a temperature sensor to detect that the laser beam is in contact with the inner surface of the holder hole (120h).

Specifically, the holder unit 120 may include a holder member 121 and a holder extension member 122.

Here, the holder unit 120 is formed with a holder hollow (121h) through which the laser beam passes.

In addition, the holder extension member 122 connects the body unit 110 and the holder member 121, a holder extension hollow 122h through which a laser beam passes is formed, and a temperature sensor (not shown) is inserted and installed. .

At this time, the holder member 121 and the holder extension member 122 are detached as a module type, and the holder hollow 121h and the holder extension hollow 122h communicate with each other to form a holder hole 120h.

The holder unit 120 configured as described above is provided with a temperature sensor on the holder extension member 122. When using a variable length laser spot welding device, the holder unit 120 of the holder unit 120 is used before the laser beam hits the object to be welded. To determine whether there is an abnormality in contact with the inner surface, it serves to measure the temperature of the holder unit 120.

Since the holder hole 120h of the holder unit 120 is substantially smaller in cross-sectional area than the body hole 11h of the body unit 110, the welding teaching position of the laser beam deviates from the size of the holder hole 120h. When the laser beam contacts the inner surface of the holder hole 120h, the laser welding is not made of a set welding pattern, and the proximity sensor mounted on the holder member 121, which will be described later, may also be damaged.

In particular, since the holder unit 120 has a circular cross-sectional shape of the holder hole 120h, the size of the holder hole 120h is smaller than that of the holder unit 120 having a conventional rectangular holder hole 120h. The possibility that the laser beam contacts the inner surface of the holder unit 120 is relatively high compared to the conventional holder unit 120.

On the other hand, the holder member 121 has a tapered shape toward the end 121e contacting the object to be welded, and the end 121e is formed in a small size corresponding to the holder hollow 121h to substantially reduce the temperature sensor. As it does not have a sufficient size to be installed, a temperature sensor is installed on the holder extension member 122.

At this time, the holder member 121 may be formed by a large temperature sensor may be installed, but if the shape processing for the installation of the temperature sensor and the proximity sensor is not a casting manufacturing process, the holder unit 120 is a modular structure. It is preferably divided into a holder member 121 and a holder extension member 122 and a temperature sensor is installed on the holder extension member 122.

Furthermore, in the holder unit 120, the holder hole 120h takes a circular shape, which is the most preferable circular welding pattern for maintaining excellent welding stiffness in the welding pattern formed on the object to be welded by a laser beam, more preferably The purpose is to match the double circular cross-shaped welding pattern (welding pattern cross-welded in a double circle together with double circular welding).

At this time, the holder unit 120 takes a tapered shape toward the end portion in contact with the object to be welded. In particular, the non-rectangular structure, that is, the non-rectangular structure (longer) is a structure in which the holder hole 120h is enlarged in cross-sectional shape at the end. By taking a circular or square structure as shown in the figure differently from the formed rectangular structure, it is possible to significantly reduce the cross-sectional area size compared to the conventional holder unit 120.

Due to this, the unnecessary portion of the holder unit 120 is eliminated, and the separation distance between the welding spots is also narrowed to maintain excellent welding rigidity, and laser spot welding is possible even in a narrow welding space, and furthermore, the laser is welded even at the curved portion of the object to be welded. Spot welding can be possible.

Meanwhile, the holder extension member 122 on which the above-described temperature sensor is installed will be described in detail as follows.

In the holder extension member 122, a holder extension cable groove 122g in which a first cable (not shown) is disposed inside may be formed in a longitudinal direction on the side so that the first cable connected to the temperature sensor is not disposed outside. have.

In addition, a sensor groove 122s may be formed in the width direction of the holder extension member 122 so that a temperature sensor is inserted into the holder extension cable groove 122g.

Here, the holder extension cable groove 122g has a structure sequentially connected to the body extension cable groove 112g of the body extension member 112 and the body cable groove 111g of the body member 111, The first cable is extended from the holder extension cable groove (122g) to the laser head 14 side through the body extension cable groove (112g) and the body cable groove (111g), so that the first cable is the holder extension member (122), As the body extension member 112 and the body member 111 are not disposed outside, the laser welding operation does not cause inconvenience and inconvenience in work that interfere with other parts of the object to be welded or other devices in the vicinity. Can be.

In addition, the holder extension cable grooves 122g are formed on both sides of the holder extension member 122, and the two sensor grooves 122s may be disposed symmetrically to each other with the holder extension hollow 122h interposed therebetween.

More specifically, one of the two sensor grooves 122s extends from the holder extension cable groove 122g formed on one side of the holder extension member 122 to one side of the holder extension hollow 122h, and the other one is the holder It may extend from the holder extension cable groove (122g) formed on the other side of the extension member 122 to the other side of the holder extension hollow (122h).

Accordingly, the temperature sensor is installed on one side and the other side of the holder extension member 122 on the inner surface of the holder extension hollow 122h, not only in one direction, but on any inner surface portion of the holder extension hollow 122h. Even when the laser beam is in contact, the temperature rise can be detected quickly and accurately.

In addition, an exhaust hole 122e communicating with the holder extension hollow 122h may be formed in the longitudinal direction in the holder extension member 122 so that welding fume is removed from the holder hole 120h. .

Specifically, the exhaust hole (122e) is a symmetrical structure extending from the holder extension hollow (122h) in a U-shaped to one side and an inverted U-shaped to the other side, it can be made of a batch structure surrounding the sensor groove (122s) .

The exhaust hole 122e is formed in communication with the holder extension hollow 122h so as to remove as much as possible the welding fume generated during laser welding of the object to be welded from the holder hole 120h, but as much as possible without interfering with the sensor groove 122s. It is formed while extending in the shape as described above to form the exhaust space.

Furthermore, the holder extension member 122 configured as described above has a modular structure that can be installed by changing the front-rear direction or the left-right direction.

Meanwhile, the holder member 121 may be provided with a proximity sensor to sense that the end 121e is in contact with the object to be welded.

The proximity sensor (not shown) may be inserted and installed in the longitudinal direction from the end surface 121f contacting the object to be welded.

Preferably, the proximity sensor may be installed one at each corner, as shown in the figure, so that the end face 121f of the holder member 121 is in full surface contact with the object to be welded.

For reference, the holder member 121 may be formed with a sensor fixing hole 121b into which a fixing member (not shown) for fixing the proximity sensor, such as a bolt, is inserted into the end 121e to fix the proximity sensor. You can.

Specifically, the holder member 121 is formed so that the sensor hole 121s into which the proximity sensor is inserted in the longitudinal direction from the end surface 121f is formed, and the second cable connected to the proximity sensor is not disposed outside. A holder cable groove (121g) in which a cable (not shown) is disposed inside may be formed in the longitudinal direction on the side.

At this time, the holder cable groove (121g) takes a structure that is connected to the holder extension cable groove (122g).

The holder cable groove (121g) has a structure sequentially connected to the holder extension cable groove (122g) and the body extension cable groove (112g) of the body extension member 112, the body cable groove (111g) of the body member 111 As a result, the second cable is extended from the holder cable groove (121g) to the laser head 14 side through the holder extension cable groove (122g), the body extension cable groove (112g), and the body cable groove (111g), thereby 2 As the cable is not disposed outside the holder member 121, the holder extension member 122, the body extension member 112, and the body member 111, other parts of the object to be welded or other surroundings during laser welding work It is possible to prevent inconvenience and hassle in work that interferes with the device.

In other words, the body unit 110 is provided with a body member 111 and a body extension member 112 sequentially connected from the lifting frame 13, so that the first cable and the second cable are not disposed outside, In the body member 111, a body cable groove 111g in which a first cable and a second cable are disposed therein is formed in the longitudinal direction on the side, and the body extension member 112 has a first cable and a second cable therein. The body extension cable groove 112g to be disposed may be formed in the longitudinal direction on the side.

At this time, the holder cable groove (121g), the holder extension cable groove (122g), the body extension cable groove (112g), and the body cable groove (111g) are sequentially communicated and covered with a cable groove cover (123), As the 1st cable and the 2nd cable are not arranged outside of the device, it is possible to prevent inconvenience and inconvenience of work.

As described above, although the present invention has been described by a limited number of embodiments and drawings, the present invention is not limited by this, and the technical idea of the present invention and the following will be described by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the equal scope of the claims to be described.

1: object to be welded R: robot arm
1000: laser spot welding device
11: Base frame 11a: Upper stopper
11b: Lower stopper 11c: Pinhole
11d: Fastening hole 12: Driving member
G: Guide bar 13: Lift frame
13a: buffer member 14: laser head
C: Optical cable 210: Clamp arm
210a: vertical fastening groove 210b: pinhole
210c: Fastening hole 220: Female bracket
221: frame fastening portion 221a: pinhole
221b: fastening hole 222: vertical arm fastening
222a: pinhole 222b: fastening hole
223: horizontal lower reinforcement 224: horizontal upper reinforcement
300: protective lens unit 310: first protective lens
320: second protective lens 400: cover
400a: lens replacement
100: holding unit
110: body unit 110h: body hole
111: body member 111h: body hollow
111a: Body assembly protrusion 111g: Body cable groove
112: body extension member 112h: body extension hollow
112a: body extension protrusion 112b: body extension groove
112g: Body extension cable groove
113: Forced air discharge unit 114: Air injection unit
115: natural air discharge unit 115a: shielding member
120: holder unit 120h: holder hole
121: holder member 121h: holder hollow
121a: holder assembly groove 121g: holder cable groove
121s: sensor hole 121e: end (of the holder member)
121f: end face (of the holder member) 121b: sensor fixing hole
122: holder extension member 122h: holder extension hollow
122a: holder extension assembly protrusion 122b: holder extension assembly groove
122e: Exhaust hole 122g: Holder extension cable groove
122s: sensor groove 123: cable groove cover

Claims (11)

A base frame on which a driving member is installed;
An elevating frame connected to the driving member and elevating by the driving member;
A laser head installed on the elevating frame and emitting a laser beam to the object to be welded;
A holding unit connected to the lifting frame so that the laser beam passes through the hollow, and pressing and holding the upper surface of the object to be welded; And
It includes; a clamp arm that supports the lower surface of the object to be welded and is configured to be detachable from the base frame.
The clamp arm is formed with a vertical fastening groove at the upper end,
The base frame and the clamp arm are connected by an arm bracket,
The arm bracket,
A frame fastening part detachable from the base frame;
A vertical arm fastening part protruding from the frame fastening part and inserted into the vertical fastening groove and fastened to the clamp arm by a fastening member; And
A horizontal lower reinforcement part protruding from the lower end of the frame fastening part and connected to the lower end of the vertical arm fastening part to prevent the vertical arm fastening part from being prevented;
Laser spot welding apparatus comprising a.
delete According to claim 1,
The arm bracket,
The projecting from the upper end of the frame fastening part is further provided with a horizontal upper reinforcement part connected to the upper end of the vertical arm fastening part,
The laser spot welding apparatus characterized in that the horizontal upper stiffener, the vertical arm fastening unit, and the horizontal lower stiffener connected to each other sequentially have an I-type structure as a whole.
delete According to claim 1,
The base frame,
A laser spot welding device characterized in that an upper stopper is mounted on the upper portion to limit the elevation of the lifting frame.
The method of claim 5,
The laser spot welding apparatus characterized in that when the lifting frame is raised and collides with the upper stopper, a buffer member is mounted on the upper portion of the lifting frame so that the laser head is buffered.
According to claim 1,
The base frame,
A laser spot welding device characterized in that a lower stopper is mounted on the lower portion to limit the descending of the elevating frame.
According to claim 1,
The holding unit is installed with a plurality of proximity sensors spaced apart at regular intervals along the edge of the bottom surface, so as to detect that the bottom surface is in contact with the object to be welded,
The driving member is electrically connected to the proximity sensor, the laser spot welding device characterized in that the sensing unit is controlled to stop after the descending speed decreases the lifting frame equipped with the holding unit when sensing.
According to claim 1,
A laser spot characterized in that a protective lens unit is disposed between the laser head and the holding portion to protect the laser optical lens from laser welding gas and welding foreign matter flowing to the laser optical lens side of the laser head through the holding portion. Welding device.
The method of claim 9,
The protective lens unit,
A first protective lens mounted on the lower end of the laser head; And
A second protective lens disposed under the first protective lens and installed between the laser head and the holding portion in the lifting frame;
Laser spot welding apparatus comprising a.
The method of claim 10,
The second protective lens is detachably mounted to the lifting frame,
A laser spot welding apparatus characterized in that a cover for covering the lifting frame is formed to open and close a lens replacement sphere through which the second protective lens passes.

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