Laser Welding Method Using a Position-Adjustable Jig System

Abstract

A method for laser welding a workpiece using a position-adjustable jig system is disclosed, the method comprising: a workpiece setting step of preparing a first workpiece and a second workpiece; a position adjustment step of adjusting the position of the jig system so that the relative positions of the first workpiece and the second workpiece are aligned; an alignment and fixing step of pressurizing and fixing the first workpiece and the second workpiece using the jig system; a welding step of performing laser welding along the joint boundary of the first workpiece and the second workpiece using a laser irradiation head; and a separation step of releasing the pressure of the jig system and separating the welded workpiece after the welding is completed.

Description

Technology Field

[0001] The present invention relates to a laser welding method, and more specifically, to a laser welding method using a position-adjustable jig system in which laser welding is performed while the workpiece is aligned and fixed using a position-adjustable jig system. Background Technology

[0002] Laser welding is a technology that uses a high-energy-density laser beam to locally melt and join workpieces. Due to its small heat-affected zone and excellent welding precision, it is widely used in manufacturing fields such as automotive parts, electronic components, and precision machine parts.

[0003] In particular, when precise joining of components with different shapes is required, such as combining disc-shaped and tubular members, center axis alignment and relative position fixation between the workpieces prior to welding are critical. Since even a slight deviation in the irradiation position can lead to uneven penetration depth, poor joints, or reduced weld strength in laser welding, the precision of pre-weld alignment directly impacts weld quality.

[0004] However, in conventional laser welding processes, welding was often performed by fabricating and using separate dedicated jigs for each shape or size of the workpiece, or by having an operator manually adjust the position and clamp it.

[0005] In this case, there was a problem where work preparation time increased and productivity decreased because jig replacement or resetting was required whenever the type of workpiece was changed.

[0006] In addition, if welding is performed without sufficient center alignment of the workpiece, eccentricity, tilting, or deviation in the gap of the joint may occur, which could degrade the welding quality.

[0007] To prevent this, an additional tack welding process is sometimes performed to temporarily secure the workpiece before welding; however, this tack welding process causes problems by increasing labor costs and overall manufacturing time.

[0008] Therefore, there is a need for a new laser welding method that can flexibly accommodate workpieces of various shapes while performing laser welding with the workpieces precisely aligned and fixed without a separate tack welding process. Prior art literature

[0009] Registration No. 10-0997886 (November 26, 2010) The problem to be solved

[0010] The present invention was devised to solve the above-mentioned problems and aims to provide a laser welding method capable of performing laser welding while precisely aligning and fixing workpieces of various shapes using a position-adjustable jig system. means of solving the problem

[0011] According to one aspect of the present invention, a method for laser welding a workpiece using a position-adjustable jig system is provided, the method comprising: a workpiece setting step of preparing a first workpiece and a second workpiece; a position adjustment step of adjusting the position of the jig system so that the relative positions of the first workpiece and the second workpiece are aligned; a step of applying pressure (tail pressure), aligning, and fixing the first workpiece and the second workpiece using the jig system; a welding step of performing laser welding along the joint boundary of the first workpiece and the second workpiece using a laser irradiation head; and a separation step of releasing the pressure of the jig system and separating the welded workpiece after the welding is completed.

[0012] The above workpiece setting step includes the step of selecting a workpiece support corresponding to the shape of the first workpiece and mounting it on a rotary chuck device; the step of selecting a tailstock head corresponding to the inner diameter of the second workpiece and mounting it on a tailstock unit; the step of fixing the first workpiece to the workpiece support; and the step of inserting the second workpiece into the through hole of the first workpiece, and the position adjustment step includes the step of adjusting the height of the tailstock unit by raising and lowering a lifting carriage.

[0013] The above alignment and fixing step includes lowering the tail rod through a link according to the rotation of the operating lever, and inserting the tail head provided at the bottom of the tail rod into the opening of the second workpiece to automatically center and pressurize fix the second workpiece; the above welding step includes rotating the rotary chuck device to rotate the first workpiece while simultaneously performing continuous laser welding with the laser irradiation head on the entire circumference of the joint boundary; and the above separation step includes raising the tail rod after welding is completed, and then horizontally swinging the base block of the tail unit to separate the central axis of the tail rod laterally from the central axis of the second workpiece, thereby withdrawing the welded product. Effects of the invention

[0014] According to the laser welding method using a position adjustment jig system according to the present invention, workpieces of various shapes can be precisely aligned and fixed using a single jig system and then welded, thereby reducing the burden of having to repeatedly manufacture or replace a separate dedicated jig even when the shape of the workpiece is changed.

[0015] In addition, since laser welding can be performed while maintaining precise alignment of the workpiece's center axis, eccentricity, tilting, and joint gap deviations in the weld area can be minimized, thereby ensuring uniform penetration depth and stable welding quality.

[0016] In addition, since direct laser welding can be performed with the workpiece precisely positioned and fixed, there is no need to perform a separate tack welding process as in the past, thereby reducing labor costs and shortening the overall manufacturing time.

[0017] In addition, since continuous welding using a rotary chuck is possible, uniform welding can be achieved along the entire circumference of the workpiece, and productivity and quality stability can be simultaneously improved while reducing dependence on operator skill. Brief explanation of the drawing

[0018] FIG. 1 is a flowchart schematically showing the entire process of a laser welding method using a position control jig system according to one embodiment of the present invention. FIG. 2 is a flowchart showing the detailed process of a laser welding method using a position control jig system according to one embodiment of the present invention. FIG. 3 is a front view showing the overall configuration of a position adjustment jig system and a laser welding device according to one embodiment of the present invention. FIG. 4 is a perspective view of a position adjustment jig system according to one embodiment of the present invention. FIGS. 5a to 5c are enlarged perspective views to explain the configuration and operation of the tail pressure unit of a position adjustment jig system. FIG. 6a is a side view showing a state in which a cardiac pressure unit according to one embodiment of the present invention has a vertical posture. FIG. 6b is a side view showing a state in which a cardiac pressure unit according to one embodiment of the present invention has been switched to a horizontal position. FIG. 7 is a control block diagram illustrating a vision-based automatic alignment correction method according to another embodiment of the present invention. Specific details for implementing the invention

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0020] In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation.

[0021] Furthermore, terms specifically defined in consideration of the structure and operation of the present invention may vary depending on the intent or practice of the user or operator. These terms should be interpreted in a meaning and concept consistent with the technical spirit of the present invention based on the content throughout this specification.

[0022] To clearly explain the present invention, descriptions of parts unrelated to the technical concept of the present invention have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0023] In addition, for components having the same configuration in various embodiments, the same reference numerals are used to describe them only in the representative embodiment, and in other embodiments, only configurations different from the representative embodiment are described.

[0024] FIGS. 1 and 2 are flowcharts for explaining a laser welding method using a position adjustment jig system according to an embodiment of the present invention, and FIGS. 3 to 6b are drawings showing the configuration of a position adjustment jig system for performing the laser welding method.

[0025] As illustrated in FIGS. 3 to 6b, a laser welding method using a position adjustment jig system according to one embodiment of the present invention can be performed using a laser welding device (10) and a position adjustment jig system (1).

[0026] The laser welding device (10) may be configured to perform fusion joining by irradiating a laser beam onto the welding area of ​​the workpiece (W1, W2). The laser welding device (10) may include a laser oscillator, a laser irradiation head, and a control unit, but since the specific configuration is a known technology, a detailed description is omitted.

[0027] In this embodiment, the laser welding device (10) may include a horizontal arm (11), a vertical column (12) installed to be movable horizontally along the horizontal arm (11), and a laser irradiation head (13) installed to be movable vertically along the vertical column (12).

[0028] The vertical column (12) can automatically move horizontally along the horizontal arm (11) under the control of the control unit, and the laser irradiation head (13) can automatically move vertically along the vertical column (12). Accordingly, the laser irradiation head (13) can be precisely positioned in the horizontal and vertical directions corresponding to the welding position of the workpiece (W1, W2).

[0029] The feature of the present invention is a method of performing laser welding after precisely aligning and fixing workpieces (W1, W2) using the laser welding device (10) and the position adjustment jig system (1).

[0030] In this embodiment, the first workpiece (W1) may be a disc-shaped metal member and may be detachably mounted on a workpiece support (202) of a rotating chuck device (200) positioned at the bottom.

[0031] The second workpiece (W2) may be a tubular metal member and may be inserted into the through hole of the first workpiece (W1).

[0032] That is, in this embodiment, laser welding can be performed along the joint boundary between the first workpiece (W1) and the second workpiece (W2).

[0033] However, the shape, size, and number of the above-mentioned workpieces (W1, W2) are merely examples, and the present invention is not limited thereto.

[0034] The above position adjustment jig system (1) may include a jig device (100) and a rotary chuck device (200).

[0035] The above jig device (100) is configured to adjust and fix the upper position of the workpiece (W1, W2) and may include a vertical support frame (110), a lifting carriage (120), a horizontal arm (130), and a tail pressure unit (140).

[0036] The above vertical support frame (110) can be fixedly installed on a work table (B) as a main frame that supports the entire structure of the jig device (100).

[0037] The lifting carriage (120) can be coupled to the vertical support frame (110) so as to be movable up and down. For example, the lifting carriage (120) can be raised by a transfer screw such as a lead screw or a ball screw, or by a rack and pinion structure.

[0038] In this embodiment, a pair of vertical guide rails (111) may be installed vertically on the vertical support frame (110) at a distance from each other, and a transfer screw (112) may be disposed between the pair of vertical guide rails (111).

[0039] The lifting carriage (120) is coupled to be vertically movable along the pair of vertical guide rails (111) and can also be coupled to the transfer screw (112) in a screw-transfer manner.

[0040] The above transfer screw (112) can be rotatably supported on an upper support bracket (113) provided at the top of the vertical support frame (110) and a lower support bracket (114) provided at the bottom.

[0041] Additionally, the transfer screw (112) may extend upward through the upper support bracket (113), and an operating handle (115) may be provided at the top thereof.

[0042] Accordingly, when the operator rotates the operating handle (115), the transfer screw (112) rotates, and in conjunction with this, the lifting carriage (120) moves up and down along the vertical guide rail (111) and can be precisely adjusted to a desired height.

[0043] The horizontal arm (130) can be formed to be connected to the lifting carriage (120) and extended in a horizontal direction. The horizontal arm (130) can be adjusted in an up-and-down position in conjunction with the lifting of the lifting carriage (120), and accordingly, the height of the tail pressure unit (140) supported by the horizontal arm (130) can also be adjusted.

[0044] The above horizontal arm (130) is configured to provide a horizontal support position corresponding to the shape, size, or welding position of the workpiece (W1, W2).

[0045] In this embodiment, the horizontal arm (130) may be positioned to protrude from the lifting carriage (120) toward the workpiece (W1, W2).

[0046] The above-mentioned tail pressure unit (140) can be slidably coupled to the horizontal arm (130) and can be fixed in the working position after position adjustment. For example, it can be optionally fixed by a fixing bolt, clamp, tightening knob, or fastening pin.

[0047] The above-mentioned pressure unit (140) is configured to press, align, and fix the second workpiece (W2) and may include a base block (141), a rotation guide plate (142), a lifting drive module (143), a pressure rod (144), and a pressure head (145).

[0048] The base block (141) is coupled to the upper surface of the horizontal arm (130) and can support the main components of the tail pressure unit (140).

[0049] The above-mentioned pivot guide plate (142) may be configured to selectively switch the pressure direction of the pressure rod (144) by changing the position of the pressure unit (140).

[0050] The above-mentioned pivot guide plate (142) may include an axial hole (142a) into which a positioning pin is inserted. The axial hole (142a) may be configured to provide a positioning reference when the position of the tail pressure unit (140) changes.

[0051] When changing positions, the position determining pin is inserted into the shaft hole (142a) to guide the rotation of the base block (141), and after the change in position is completed, the position determining pin is separated or retracted to prevent interference during operation.

[0052] Additionally, an arc-shaped guide slot (142b) centered on the shaft hole (142a) may be formed in the rotation guide plate (142).

[0053] A pin that is inserted into the guide slot (142b) may be formed on the side of the base block (141), and the pin may guide and limit the rotation angle of the base block (141) while moving along the guide slot (142b).

[0054] Accordingly, the base block (141) can rotate within a range of about 90 degrees, and the direction of the pressure rod (144) can be changed between the vertical direction and the horizontal direction.

[0055] The above lifting drive module (143) may be configured to be installed on the base block (141) to lift the pressure rod (144).

[0056] In this embodiment, the lifting drive module (143) may include an operating lever (143a), a lever bracket (143b), a lever shaft (143c), and a link (143d).

[0057] The above operating lever (143a) is configured to receive manual operating force from the operator.

[0058] The lever bracket (143b) is installed on the upper surface of the base block (141) to support the operating lever (143a) and the lever shaft (143c).

[0059] The lever shaft (143c) can serve as the rotational center axis of the operating lever (143a).

[0060] One end of the above link (143d) is connected to the operating lever (143a) and the other end is connected to the pressure rod (144), so that the rotational movement of the operating lever (143a) can be converted into a linear upward movement of the pressure rod (144).

[0061] Accordingly, when the operator rotates the operating lever (143a), the link (143d) moves in conjunction, allowing the pressure rod (144) to be raised or lowered.

[0062] The above pressure rod (144) is a rod-shaped member that is movably connected to the base block (141) and can be configured to transmit pressure from the upper side to the lower side of the second workpiece (W2).

[0063] Alternatively, the lifting drive module (143) may further include a pressure adjustment unit so that the pressure applied through the pressure rod (144) does not exceed a set range.

[0064] For example, the pressure adjustment unit may include a compression spring, a gas spring, a torque limiting lever, a friction clutch, or a similar overload limiting mechanism.

[0065] Since the appropriate pressure for each workpiece can be set by the pressure adjustment unit described above, stable welding operations are possible using the same jig system for various workpieces with different thicknesses or stiffnesses.

[0066] Accordingly, even if the operator over-operates the operating lever (143a), the pressure transmitted to the second workpiece (W2) through the pressure rod (144) can be limited to a set maximum value.

[0067] In particular, since local deformation, distortion, or center axis alignment error of the second workpiece (W2) may occur due to excessive pressure during the laser welding process, the pressure control unit can contribute to ensuring stable welding quality while preventing such problems.

[0068] A pressure head (145) can be attached to the lower end of the pressure rod (144).

[0069] The above-mentioned tail head (145) may include a tapered shape in which the diameter decreases as it goes downward.

[0070] Accordingly, when the tailstock head (145) is inserted into the upper opening of the second workpiece (W2), automatic centering can be achieved by the tapered shape.

[0071] Additionally, the above-mentioned tail head (145) can be detachably coupled and replaced to correspond to tubular workpieces of various inner diameters.

[0072] Although not described in detail, the above-mentioned pressure head (145) can be combined with a spherical support formed at the bottom of the pressure rod (144) and an elastic member that elastically supports the spherical support.

[0073] Accordingly, the above-mentioned tail pressure head (145) can be tilted or moved slightly laterally within a predetermined range with respect to the central axis of the tail pressure rod (144), and even if there is eccentricity or assembly error of the workpiece, the posture is automatically corrected so that stable centering is possible.

[0074] Meanwhile, the base block (141) can be coupled to the upper surface of the horizontal arm (130) so as to be horizontally swingable within a predetermined angle range.

[0075] Specifically, a swing rotation axis (141a) may be formed on the lower part of the base block (141) or on the upper surface of the horizontal arm (130), and the base block (141) may be supported so as to be rotatable on a horizontal plane around the swing rotation axis (141a).

[0076] Additionally, an arc-shaped swing slot (141b) may be formed in the base block (141), and a guide pin inserted into the swing slot (141b) may be formed in the horizontal arm (130).

[0077] The swing slot (141b) can be formed with the swing rotation axis (141a) as the center of the arc.

[0078] In particular, the swing slot (141b) can be formed to allow a rotation range of approximately 7.5 degrees to the left and right, and a total of approximately 15 degrees relative to the neutral position.

[0079] Accordingly, the base block (141) can swing and rotate only within a limited range in the left and right directions.

[0080] This swing rotation is a movement distinct from the approximately 90-degree posture change using the above-mentioned rotation guide plate (142).

[0081] That is, the swing rotation of approximately 15 degrees is intended to move the center axis of the tail rod (144) away from the center axis of the second workpiece (W2) after welding is completed to secure a space for workpiece extraction, and the position change of approximately 90 degrees is intended to change the tail direction itself.

[0082] The above rotary chuck device (200) may include a chuck (201), a work support (202), and a rotary drive unit (203).

[0083] The above-mentioned rotary drive unit (203) may include a motor and can rotate the work support unit (202) by rotating the chuck (201).

[0084] The above work support member (202) may include a seating surface or a fastening structure corresponding to the shape of the first workpiece (W1), and may be installed so as to be detachably replaceable to correspond to workpieces of various shapes.

[0085] Hereinafter, a laser welding method using the position adjustment jig system of the present invention will be described with reference to the flowcharts of FIGS. 1 and 2.

[0086] Hereinafter, a laser welding method using the position adjustment jig system of the present invention will be described with reference to the flowcharts of FIGS. 1 and 2.

[0087] A laser welding method using the position adjustment jig system of the present invention may include a workpiece setting step (S10), a position adjustment step (S20), an alignment and fixing step (S30), a laser welding step (S40), and a finished product separation step (S50).

[0088] First, the workpiece setting step (S10) is a step of preparing a jig configuration suitable for the welding target.

[0089] Specifically, as shown in FIG. 2, the operator can select a work support (202) corresponding to the shape of the first workpiece (W1) (S111).

[0090] For example, if the first workpiece (W1) is a disc-shaped metal member, a workpiece support (202) with a seating shape corresponding to the external shape and diameter may be selected.

[0091] In addition, the operator can select a tail head (145) corresponding to the shape, inner diameter, and pressure conditions of the second workpiece (W2) (S112).

[0092] The tail pressure head (145) can be provided in multiple types to accommodate tubular members of various inner diameters and can be configured to be replaceable as needed.

[0093] Afterwards, the selected work support (202) is mounted on the rotary chuck device (200), and the selected tailing head (145) is coupled to the bottom of the tailing rod (144) (S113).

[0094] Accordingly, the jig setting optimized for the workpiece can be completed.

[0095] Next, the position adjustment step (S20) is a step of placing the workpieces (W1, W2) at the actual work position.

[0096] Specifically, the operator can place and secure the first workpiece (W1) on the work support (202) of the rotary chuck device (200) (S121).

[0097] At this time, the chuck (201) can provide a clamping force so that the first workpiece (W1) is maintained without shaking even while rotating.

[0098] Afterwards, the second workpiece (W2) can be inserted into the through hole or joint of the first workpiece (W1) (S122).

[0099] Accordingly, the first workpiece (W1) and the second workpiece (W2) can be placed in a temporary assembly state before welding.

[0100] Next, the alignment and fixing step (S30) is a step of precisely adjusting the relative position of the workpiece using a jig device (100).

[0101] First, the operator can adjust the height of the lifting carriage (120) by rotating the operating handle (115) (S131).

[0102] Accordingly, the total height of the tail pressure unit (140) can be adjusted to correspond to the upper position of the second workpiece (W2).

[0103] Afterwards, the pressure unit (140) can be slid along the horizontal arm (130) to adjust its horizontal position (S132).

[0104] For example, the position of the central axis of the pressure rod (144) can be adjusted so that it aligns as much as possible with the central axis of the second workpiece (W2).

[0105] Next, the operator can operate the operating lever (143a) of the lifting drive module (143) (S141).

[0106] The rotational movement of the operating lever (143a) can be converted into the linear movement of the pressure rod (144) through the link (143d).

[0107] Accordingly, the pressure rod (144) is lowered (S142).

[0108] As the tail rod (144) descends, the tail head (145) can be inserted into the upper opening of the second workpiece (W2) (S143).

[0109] At this time, automatic centering can be performed by the tapered shape of the tailstock head (145).

[0110] In addition, if the tail pressure head (145) includes a micro-flow structure, automatic correction is possible even if assembly eccentricity or center error exists.

[0111] Afterwards, the pressure rod (144) presses and fixes the second workpiece (W2) (S144).

[0112] In this process, an alternatively provided pressure control unit can prevent excessive pressure from being transmitted.

[0113] For example, it can be limited so as not to exceed the maximum pressure set by a compression spring, gas spring, torque limiting lever, friction clutch, etc.

[0114] Accordingly, the first workpiece (W1) and the second workpiece (W2) can be precisely aligned and fixed, and welding preparation is completed without a separate tack welding process.

[0115] Next, a laser welding step (S40) is performed.

[0116] First, the laser irradiation head (13) can be adjusted in position to correspond to the welding position (S151).

[0117] The laser irradiation head (13) can be precisely aligned at the joint boundary while moving along the horizontal arm (11) and the vertical column (12).

[0118] Afterwards, the rotary drive unit (203) rotates the chuck (201) (S152).

[0119] Accordingly, the work support (202) and the first workpiece (W1) rotate together.

[0120] In this state, laser welding is performed by irradiating a laser beam along the joint boundary (S153).

[0121] Since the entire edge of the weldment is continuously passed under the laser irradiation head (13) by the rotation of the rotating chuck device (200), continuous welding in the circumferential direction is possible.

[0122] Next, the finished product separation step (S50) is performed.

[0123] First, the operator can release the pressure of the pressure rod (144) by operating the operating lever (143a) in the opposite direction (S161).

[0124] Accordingly, the tail rod (144) rises so that the tail head (145) is separated from the second workpiece (W2) (S162).

[0125] Afterwards, the base block (141) can be moved horizontally by a predetermined angle around the swing rotation axis (141a) (S163).

[0126] For example, it can rotate within a range of about 7.5 degrees to the left and right, and a total of about 15 degrees relative to the neutral position.

[0127] Due to this swinging motion, the central axis of the tail rod (144) moves laterally away from the central axis of the second workpiece (W2).

[0128] This is distinct from the operation of the rotating guide plate (142) that changes the position of the pressure unit (140) by 90 degrees, and is a fine avoidance operation to secure space for extracting the finished product.

[0129] As a result, the upper space of the finished product is open, allowing the worker to pull out the welded workpiece without interference (S164).

[0130] Consequently, the laser welding method using the position adjustment jig system of the present invention can improve work efficiency and productivity by enabling precise alignment, stable fixation, high-quality laser welding, and rapid workpiece replacement for workpieces of various shapes.

[0131] FIG. 7 is a control block diagram illustrating a vision-based automatic alignment correction method according to another embodiment of the present invention.

[0132] According to another embodiment of the present invention, an automatic alignment correction step using a vision sensor unit (400) may be additionally performed after the position adjustment step (S20) or before the alignment and fixing step (S30).

[0133] The above vision sensor unit (400) is configured to detect the position and alignment status of the workpiece (W1, W2) and may include a camera.

[0134] Alternatively, the vision sensor unit (400) may further include a distance sensor, a laser displacement sensor, a lighting device, or a combination thereof.

[0135] The vision sensor unit (400) can detect the center position of the first workpiece (W1), the center position of the second workpiece (W2), the gap between the two workpieces, the inclination, and the alignment error.

[0136] The detected information can be transmitted to the control unit (500).

[0137] The above control unit (500) can perform automatic correction calculations based on the detection signal input from the vision sensor unit (400).

[0138] For example, the control unit (500) can perform at least one of center position detection, center error calculation, gap (gap) analysis, slope calculation, alignment error calculation, and correction command generation.

[0139] In particular, the control unit (500) can calculate the amount of eccentricity between the center axis of the first workpiece (W1) and the center axis of the second workpiece (W2).

[0140] Additionally, the control unit (500) can output a correction control signal to the jig device (100) and the rotary chuck device (200) based on the calculated error value.

[0141] According to the above correction control signal, the position of the lifting carriage (120), horizontal arm (130), or tail pressure unit (140) of the jig device (100) can be automatically adjusted.

[0142] For example, if the second workpiece (W2) is eccentric in the X-axis direction, the tailing unit (140) can be moved slightly in the horizontal direction to correct the center axis alignment error.

[0143] Additionally, the rotary chuck device (200) can finely adjust the rotation angle, rotation speed, or position of the chuck (201) or the work support (202).

[0144] Through this, the relative positions of the first workpiece (W1) and the second workpiece (W2) can be automatically corrected.

[0145] When the alignment error decreases below the allowable range, the control unit (500) can generate an alignment completion signal, and then the alignment and fixing step (S30) can be performed.

[0146] This automatic alignment correction step reduces the operator's reliance on manual adjustment and ensures consistent alignment precision even during repetitive tasks.

[0147] In particular, it can effectively reduce welding defects caused by center eccentricity or gap deviation in small precision parts or high-precision cylindrical laser welding processes.

[0148] As a result, according to the present embodiment, automatic alignment correction before welding is possible, which can contribute to increased productivity, reduced defect rates, and uniform welding quality.

[0149] The present invention is not limited by the aforementioned embodiments and can be implemented with various modifications. Explanation of the symbols

[0150] 1 : Position adjustment jig system 10: Laser welding device 11: Horizontal arm 12: Vertical column 13: Laser Irradiation Head 100 : Jig device 110: Vertical support frame 111: Vertical guide rail 112: Transfer screw 113: Upper support bracket 114: Lower support bracket 115 : Operation handle 120 : Elevator carriage 130 : Horizontal arm 140: Cardiac pressure unit 141 : Base Block 141a : Swing rotation axis 141b : Swing slot 142 : Rotation guide plate 142a : Axle hole 142b : Guide slot 143: Lifting drive module 143a : Operating lever 143b : Lever bracket 143c : Lever axis 143d : Link 144 : Cardiac pressure rod 145: Tail pressure head 200: Rotary chuck device 201 : Chuck 202 : Work support 203: Rotary drive unit 400: Vision sensor unit 500 : Control unit B: Work table W1: First workpiece W2: Second workpiece S10: Workpiece setup step S20: Position adjustment step S30: Alignment and fixing steps S40: Laser welding step S50: Finished product separation step S111: Work support selection step S112: Tail pressure head selection step S113: Jig System Setting Step S121: First workpiece mounting step S122: Second workpiece insertion step S131: Lifting carriage adjustment step S132: Horizontal movement step of the cerebral pressure unit S141: Lever operation step S142: Pressure rod descent phase S143: Automatic centering step S144: Pressure fixation step S151: Laser head position adjustment step S152: Chuck rotation drive step S153: Laser welding execution step S161: Cardiac pressure release stage S162: Pressure rod ascent phase S163: Swing movement step S164: Finished Product Withdrawal Step

Claims

Claim 1 A method for laser welding a workpiece using a position-adjustable jig system, comprising: a workpiece setting step for preparing a first workpiece and a second workpiece; a position adjustment step for adjusting the position of the jig system so that the relative positions of the first workpiece and the second workpiece are aligned; an alignment and fixing step for pressurizing and fixing the first workpiece and the second workpiece using the jig system; and a welding step for performing laser welding along the joint boundary of the first workpiece and the second workpiece using a laser irradiation head. A laser welding method using a position-adjusting jig system, characterized in that it includes a separation step of releasing pressure from the jig system and separating the welded product after welding is completed, wherein the alignment and fixing step includes lowering the tail rod through a link according to the rotation of an operating lever, and inserting a tail head provided at the bottom of the tail rod into the opening of the second workpiece to automatically center and press-fix the second workpiece, wherein the welding step includes rotating a rotary chuck device to rotate the first workpiece while simultaneously performing continuous laser welding with a laser irradiation head on the entire circumference of the joint boundary, and wherein the separation step includes raising the tail rod after welding is completed, and then horizontally swinging the base block of the tail unit to separate the central axis of the tail rod laterally from the central axis of the second workpiece. Claim 2 A laser welding method using a position adjustment jig system according to claim 1, wherein the workpiece setting step comprises: selecting a workpiece support corresponding to the shape of the first workpiece and mounting it on a rotary chuck device; selecting a tailing head corresponding to the inner diameter of the second workpiece and mounting it on a tailing unit; fixing the first workpiece to the workpiece support; and inserting the second workpiece into a through hole of the first workpiece, and wherein the position adjustment step comprises raising and lowering a lifting carriage to adjust the height of the tailing unit. Claim 3 delete

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