WO2013172202A1 - スイッチ用電極及びそれを用いた抵抗溶接装置、スポット溶接装置及びスポット溶接方法 - Google Patents
スイッチ用電極及びそれを用いた抵抗溶接装置、スポット溶接装置及びスポット溶接方法 Download PDFInfo
- Publication number
- WO2013172202A1 WO2013172202A1 PCT/JP2013/062671 JP2013062671W WO2013172202A1 WO 2013172202 A1 WO2013172202 A1 WO 2013172202A1 JP 2013062671 W JP2013062671 W JP 2013062671W WO 2013172202 A1 WO2013172202 A1 WO 2013172202A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- current
- auxiliary
- welding
- workpiece
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/3009—Pressure electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
- B23K11/314—Spot welding guns, e.g. mounted on robots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
Definitions
- the present invention relates to a switch electrode and a resistance welding apparatus using the switch electrode.
- the electrode is composed of a pair of electrodes, and is energized by bringing the pair of electrodes into surface contact with each other, and the switch electrode used for a switch that interrupts energization by separating the electrodes, and resistance welding using the switch electrode Relates to the device.
- the present invention also relates to a spot welding apparatus and a spot welding method. Specifically, the present invention relates to a spot welding apparatus and a spot welding method for performing welding on a workpiece formed by arranging a plate material having a minimum thickness on the outermost side.
- spot welding also referred to as “resistance welding”
- spot welding is used for joining workpieces in which a plurality of plate materials are stacked.
- the stacked workpieces are pressed between a pair of electrode tips, and a current is passed between the electrode tips in a state where a predetermined pressure or more is maintained.
- the work material is melted by Joule heat generated by energization, and a nugget that is a melt of the plate material is generated at the interface of the plate material between the electrode chips.
- the nugget is cooled and solidified, and the plate material is welded.
- the thickness of the plate material is not always constant. Rather, the thickness of the plate material is generally not constant.
- the interface between the thinnest plate material located outside hereinafter sometimes referred to as “thinnest plate material” and the plate material adjacent thereto is located near the outside of the workpiece.
- the nugget does not grow sufficiently between the thinnest plate and the adjacent plate, and the thinnest plate and the adjacent plate are It may not be possible to join satisfactorily.
- a spot welding apparatus provided with an auxiliary electrode tip that comes into contact with the thinnest plate material in addition to a pair of electrode tips that sandwich a workpiece is known (for example, Patent Document 1, Patent Document 1). 2).
- a welding electrode tip and an auxiliary electrode tip are brought into contact with the thinnest plate material, and an electric current is passed between these electrode tips to heat the vicinity of the outside of the workpiece.
- an electric current is passed between these electrode tips to heat the vicinity of the outside of the workpiece.
- a current is shunted at a constant rate, but also one of the shunted currents may be interrupted by a switch.
- the welding electrode tip and the auxiliary electrode are energized between the pair of electrode tips that sandwich the workpiece and between the welding electrode tip and the auxiliary electrode tip.
- the position where the welded portion is formed can be changed during resistance welding by cutting off the power supply to the tip with a switch.
- a switch it is possible to use a switch that energizes by simply bringing two electrodes into contact with each other and cuts off a current by separating them.
- a silver plating layer is formed on the surface of the electrode, and graphite powder is sprayed at a high speed onto the silver plating layer, and the surface of the silver plating layer is formed by heat generated by the general injection.
- An electrode is used in which a graphite lubricating layer is formed by melting and laminating the graphite powder on the surface of the molten silver plating layer (see, for example, Patent Document 3).
- the electrode for a switch for cutting off the current of resistance welding is smoothed by plating to protect it from wear due to the occurrence of sparks, the current is repeatedly cut off as the electrode surface becomes smoother.
- the change in the resistance value of the electrode due to this becomes large.
- the resistance value of the electrode at the beginning of use can be reduced by plating the electrode surface, etc., but eventually the electrode surface is damaged by repeatedly interrupting the current thousands and tens of thousands of times. It is difficult to prevent it.
- the thinnest plate material may not be appropriately welded depending on the state of the workpiece to be welded.
- the nugget when the electrode tip is in contact with the workpiece while being inclined, the nugget is generated in an inclined state as compared with the case where the electrode tip is in contact with the workpiece vertically. If the nugget is inclined, the nugget cannot sufficiently cover the interface between the thinnest plate material located near the outside of the workpiece and the adjacent plate material, and the thinnest plate material cannot be appropriately welded.
- current flows through the contact portion and the current flowing through the auxiliary electrode tip is reduced. As a result, sufficient nuggets are not generated at the interface between the thinnest plate member and the adjacent plate member, and the thinnest plate member cannot be appropriately welded.
- An object of the present invention is to provide a switch electrode that can be used, and a resistance welding apparatus using the switch electrode (first object).
- Another object of the present invention is to provide a spot welding apparatus and a spot welding method for appropriately welding the thinnest plate material arranged outside the workpiece (second object).
- the present invention provides a switch electrode used for a switch which is composed of a pair of electrodes, which is energized by bringing the pair of electrodes into surface contact with each other, and which is de-energized by separating the electrodes.
- the switch electrode according to the present invention is a plane in which at least one of the surfaces where the pair of electrodes (for example, a first switch electrode chip 21 and a second switch electrode chip 22 described later) contact each other is uneven. It is characterized by being.
- the electrodes of the electrode used for the switch are brought into contact with each other on the surface, and the contact surface is subjected to uneven processing. Allowing the electrode surface to be damaged by the occurrence of sparks, and conversely, by applying irregularities to the surfaces where the electrodes contact each other, even if the current is repeatedly cut off by the switch, the contact area between the switch electrodes changes little Thus, a pair of switch electrodes with little change in resistance can be provided.
- the surface roughness (Ra) of the plane is preferably 60 to 150 ⁇ m.
- the surface roughness (Ra) of the surface subjected to the unevenness processing is within the above range, thereby repeatedly interrupting the current.
- the change in the resistance value of the switch electrode can be further reduced.
- a contact area ratio on a surface where the pair of electrodes contact each other is 10 to 90%.
- a resistance welding apparatus for example, a spot welding apparatus 1 described later
- a work for example, a work W described later
- a plurality of plate materials for example, W1, W2 and W3 described later.
- the resistance welding apparatus is in contact with the workpiece from a side opposite to the first welding electrode (for example, a welding electrode tip 121 described later) that contacts the one surface of the workpiece, And a second welding electrode having a polarity opposite to that of the first welding electrode (for example, a main energization electrode tip 131 described later), abutting on the workpiece from the same side as the first welding electrode, and The auxiliary electrode having a polarity opposite to that of the first welding electrode (for example, an auxiliary energization electrode tip 122 described later), the first welding electrode, the second welding electrode, and the auxiliary electrode are used to connect the workpiece.
- Energizing means e.g., controller 100, power source 30 will be described later, the switch 20 for interrupting at that switch, characterized in that it comprises a, a.
- a resistance welding apparatus capable of stably joining plate members even if the electrode is continuously used. Can be provided.
- the present invention is a work (for example, a work W described later) in which three or more plate materials (for example, a thinnest plate material W1, a plate material W2, a plate material W3 described later) are overlapped.
- a spot welding apparatus for performing welding on a workpiece formed by arranging the thinnest plate material (for example, the thinnest plate material W1 described later) having the smallest thickness among the plate materials.
- a spot welding apparatus (for example, a spot welding apparatus 1 described later) contacts a welding electrode (for example, a welding electrode tip 121 described later) that contacts the thinnest plate, and the thinnest sheet,
- a welding electrode for example, a welding electrode tip 121 described later
- An auxiliary energizing electrode for example, an auxiliary energizing electrode tip 122 described later
- the welding electrode and the auxiliary energizing electrode are sandwiched between the workpieces, and the welding is performed.
- the main energizing electrode for example, a main energizing electrode chip 131 described later
- the state of the auxiliary energizing electrode for example, an abutting angle or current value of an auxiliary current described later
- Auxiliary current control means for example, a control device 100 described later for detecting and controlling a current flowing in a current path connecting between the welding electrode and the auxiliary energization electrode according to the detected state.
- the spot welding apparatus is different from the conventional spot welding apparatus in which a current is simply supplied to the auxiliary energization electrode, and an auxiliary for welding the thinnest plate material according to the state of the auxiliary energization electrode.
- the current flowing to the energizing electrode is controlled. Accordingly, the current flowing through the auxiliary energization electrode can be varied depending on the state of the auxiliary energization electrode (that is, the state of the workpiece), and the thinnest plate material can be appropriately welded regardless of the state of the workpiece.
- the contact angle of the welding electrode and the auxiliary energization electrode to the thinnest plate material (for example, the contact angle of a later-described spot welding gun 10 with respect to the workpiece W described later) ⁇ ) may be used.
- the welding electrode and the auxiliary energization electrode are inclined and in contact with the thinnest plate material, the current flowing through the auxiliary energization electrode can be made different. A nugget that cannot sufficiently cover the interface between adjacent plate materials can be grown, and the thinnest plate material can be appropriately welded.
- the contact angle of the welding electrode and the auxiliary energization electrode with the thinnest plate material is, for example, the amount of movement of the welding electrode to contact the thinnest plate material (for example, the movement amount of the rod 12 described later). ) And the amount of movement of the auxiliary energization electrode moved to contact the thinnest plate material (for example, the amount of movement of the rod 12 described later + the amount of movement of the moving means described later).
- the current value of the current flowing through the auxiliary energization electrode may be used.
- the spot welding apparatus of the present invention detects the contact state inside the workpiece by measuring the current value of the auxiliary energizing electrode.
- the current to the auxiliary energization electrode can be controlled in accordance with the contact state inside the work that cannot be determined from the appearance, and the thinnest plate material can be appropriately welded.
- a work for example, a work W described later
- three or more plate materials for example, a thinnest plate material W1, a plate material W2, a plate material W3 described later
- the thinnest in the plate material has the smallest thickness.
- a spot welding method for performing welding on a workpiece formed by arranging plate members on the outermost side.
- a welding electrode for example, a welding electrode tip 121 described later
- an auxiliary energizing electrode for example, an auxiliary power described later
- a current-carrying electrode tip 122) is brought into contact, and a main current-carrying electrode having a polarity opposite to that of the welding electrode (for example, a main current-carrying electrode tip 131 described later) is applied to the side opposite to the thinnest plate material side.
- a main current-carrying electrode having a polarity opposite to that of the welding electrode for example, a main current-carrying electrode tip 131 described later
- the contact angle of the welding electrode and the auxiliary energization electrode to the thinnest plate material may be used, and the current flowing through the auxiliary energization electrode may be used.
- a value may be used.
- This spot welding method has the same effect as the invention of the spot welding apparatus described above.
- the present invention even if the current of a large amount of current continues to be interrupted repeatedly, since the change in the resistance value of the electrode used for the switch is small, a stable amount of current even if continued to be used Can be provided. Moreover, even if it continues using it, the resistance welding apparatus which can join between board
- FIG. 1 is a side view showing a configuration of a spot welding apparatus using a switch having a pair of switch electrodes according to an embodiment of the present invention.
- the spot welding apparatus 1 is an electric spot welding apparatus attached to the tip of the robot arm 80.
- the spot welding apparatus 1 pressurizes a workpiece W obtained by superposing a plurality of plate materials W1 (thin plate), W2 (thick plate) and W3 (thick plate) between a plurality of electrodes which will be described later.
- the work W is welded by energization.
- the spot welding apparatus 1 includes a spot welding gun 10 supported by a support portion 90 provided at the tip of a robot arm 80, and a control device 100 that controls the spot welding gun 10.
- the support unit 90 includes a support bracket 91.
- the support bracket 91 includes an upper plate 91a and a lower plate 91b parallel to the upper plate 91a.
- a guide bar 92 is bridged between the upper plate 91a and the lower plate 91b.
- the guide bar 92 is provided with a support plate 93 that is slidable in the axial direction.
- the support plate 93 extends in parallel to the upper plate 91a and the lower plate 91b from the robot arm 80 side, and supports the spot welding gun 10 on the tip side.
- a casing-like support body 94 is provided on the upper surface on the base end side of the support plate 93.
- a first coil spring 95 wound around the guide bar 92 is interposed between the upper plate 91a and the support 94.
- a second coil spring 96 wound around the guide bar 92 is interposed between the lower plate 91 b and the support plate 93.
- the spot welding gun 10 can be moved up and down relative to the support portion 90 by being supported by the support plate 93.
- the spot welding gun 10 includes a welding gun main body 11, a welding electrode portion 15 provided at the tip of the welding gun main body 11, and a power source 30 as a current source described later.
- the welding gun body 11 includes a servo motor 16 provided on the upper portion thereof, and a feed screw mechanism (not shown) connected to the servo motor 16.
- the welding electrode unit 15 includes a movable electrode unit 120 and a fixed electrode unit 130.
- the movable electrode portion 120 protrudes downward from the tip of the welding gun body 11 and is supported by the tip of the rod 12 connected to the feed screw mechanism.
- the movable electrode portion 120 can move forward and backward with respect to the fixed electrode portion 130 to be described later when the rod 12 moves up and down (moves in the A2 direction or the A1 direction in FIG. 1) via the feed screw mechanism by the servo motor 16.
- the fixed electrode portion 130 is supported by the tip of the C-shaped yoke 13 that extends downward from the connecting portion 14 connected to the tip of the welding gun body 11.
- the movable electrode portion 120 and the fixed electrode portion 130 are disposed to face each other with the workpiece W interposed therebetween.
- the movable electrode portion 120 includes a welding electrode tip 121 and an auxiliary energizing electrode tip 122
- the fixed electrode portion 130 includes a main energizing electrode tip 131.
- the welding electrode tip 121, the auxiliary energizing electrode tip 122, and the main energizing portion The electrode tip 131 pressurizes and clamps the workpiece W.
- the switch 20 includes a first switch electrode tip 21, a second switch electrode tip 22, and a cylinder mechanism 23.
- the first switch electrode tip 21 is attached to the welding gun body 11.
- a cylinder mechanism 23 is attached to the second switch electrode tip 22.
- the second switch electrode tip 22 can be driven up and down by a cylinder mechanism 23.
- the first switch electrode chip 21 and the second switch electrode chip are energized by driving the second switch electrode chip 22 and bringing the first switch electrode chip 21 and the second switch electrode chip 22 into contact with each other. The current is cut off by separating 22.
- FIG. 2 is a diagram illustrating a configuration of the welding electrode portion 15 of the spot welding apparatus 1.
- the height positions of the distal end surfaces of the welding electrode tip 121 and the auxiliary energizing electrode tip 122 included in the movable electrode portion 120 are substantially the same.
- the welding electrode tip 121 and the auxiliary energizing electrode tip 122 are arranged along the surface direction of the workpiece W with a predetermined interval. These electrode tips are cylindrical, and the tip of the welding electrode tip 121 has a dome shape.
- the main energizing electrode tip 131 included in the fixed electrode portion 130 is disposed opposite the welding electrode tip 121 with the workpiece W interposed therebetween.
- the main energizing electrode tip 131 has a cylindrical shape, and its tip has a dome shape.
- a power source 30 is connected to the welding electrode portion 15 having the above-described configuration. Specifically, as shown in FIG. 2, the positive electrode of the power supply 30 is connected to the welding electrode tip 121, and the negative electrode is connected to the main energizing electrode tip 131 and the auxiliary energizing electrode tip 122.
- the welding current flowing into the workpiece W from the power source 30 via the welding electrode tip 121 flows along the current path D1 toward the main energizing electrode tip 131 and the current path D2 toward the auxiliary energizing electrode tip 122, Each returns to the power supply 30 via the main energizing electrode tip 131 and the auxiliary energizing electrode tip 122.
- the current density at the interface between W2 and W3 is also present in the thickness direction between the welding electrode tip 121 and the main energizing electrode tip 131. Rather, the current density at the interface between W1 and W2 is higher.
- the heat of fusion of the plate material is more likely to occur on the thick plate-thick plate side than on the thin plate-thick plate side.
- the electrodes are arranged as shown in FIG. 2, the current density on the thin plate-thick plate side is increased as described above, so that the thin plate-thick plate side, which is difficult to be joined by resistance welding, is effectively melted and bonded. can do.
- a switch 20 is provided between the auxiliary energizing electrode tip 122 and the negative electrode of the power source 30.
- the thickness between the welding electrode tip 121 and the main conduction electrode tip 131 is obtained by diverting the current to the current path D1 and the current path D2 at the initial stage of energization.
- the nugget N1 at the interface between W1 and W2 is grown. After the nugget N1 has sufficiently grown, the current path D1 is made only the current path D1 by cutting off the current with the switch 20, and the nugget N2 at the interface between W2 and W3 is grown.
- the nugget N1 and the nugget N2 can be grown in a well-balanced manner by cutting off the current with the switch 20, it is possible to obtain a bonded portion with excellent bonding strength.
- the power supply 30 and the switch 20 are controlled by the control device 100.
- FIG. 2 represents the state immediately after the start of resistance welding, the nuggets N1 and N2 have not grown so much.
- the servo motor 16 is controlled by the control device 100.
- the spot welding gun 10 is moved to the welding site of the workpiece W by the operation of the robot arm 80 and the support unit 90 in a state where the movable electrode unit 120 is separated from the fixed electrode unit 130. Specifically, the spot welding gun 10 is moved to a position where the distal end surface of the main energizing electrode tip 131 of the fixed electrode portion 130 is in contact with the lower surface of the welded portion of the workpiece W.
- the servo motor 16 is controlled by the control device 100, and the movable electrode portion 120 is advanced with respect to the workpiece W by the action of the feed screw mechanism. Then, the respective tip surfaces of the welding electrode tip 121 and the auxiliary energizing electrode tip 122 come into contact with the upper surface of the workpiece W.
- the control device 100 controls the power supply 30 to supply the welding current. Then, a welding current flows from the welding electrode tip 121 to the main energizing electrode tip 131 along the current path D1, and a welding current flows from the welding electrode tip 121 to the auxiliary energizing electrode tip 122 along the current path D2. .
- a welding current flows from the welding electrode tip 121 to the main energizing electrode tip 131 along the current path D1
- a welding current flows from the welding electrode tip 121 to the auxiliary energizing electrode tip 122 along the current path D2.
- the control device 100 controls the switch 20 to stop the supply of the welding current flowing along the current path D2.
- the control device 100 controls the switch 20 to stop the supply of the welding current flowing along the current path D2.
- control device 100 controls the power supply 30 to stop the supply of the welding current. As a result, the nugget is cooled and solidified, and the workpiece W is welded.
- the switch 20 will be described. As described above, the first switch electrode tip 21 and the second switch electrode tip 22 of the switch 20 are brought into contact with each other, and the current is cut off by being separated. Since the switch 20 blocks a large-capacity current used in resistance welding, a spark is generated when the electrodes are separated from each other. The occurrence of a spark when the current is interrupted is undesirable because it damages and wears the electrode surface. In order to prevent the occurrence of sparks, a spark prevention mechanism can be provided, but it is difficult to completely suppress the occurrence of sparks by a spark prevention mechanism at a large current for resistance welding. Even when the electrode surface is plated or the like, the electrode surface is worn by being repeatedly used thousands and tens of thousands of times as in a resistance welding apparatus.
- the switch electrodes are brought into surface contact with each other, and the surface where the electrodes are in contact is subjected to uneven processing. Therefore, it was decided to allow the generation of a spark when the current was interrupted. In other words, if the surface of the electrode is roughened from the beginning, even if a spark occurs when the current is interrupted and the electrode surface is damaged, the contact area between the electrodes for the switch due to the damage can be suppressed. The influence on the resistance value of the electrode is also small.
- the reason why the electrodes for a pair of switches are in surface contact is that if there is a certain area on the surface where the electrodes are in contact with each other, there is an effect on the increase or decrease in the contact area between the electrodes due to the spark at the time of current interruption. Because there are few.
- the shape of the switch electrode is not particularly limited as long as the switch electrodes are in contact with each other on the surface.
- the surface subjected to the uneven processing is a flat surface, and the surface in contact with the surface subjected to the uneven processing is also a flat surface.
- the unevenness on the surface of the switch electrode may be applied to one of the switch electrodes or both of the switch electrodes.
- the unevenness is applied to both the switch electrodes, there is a tendency that the influence on the increase / decrease in the contact area between the switch electrodes due to repeated interruption of the current tends to be small.
- the unevenness on the surface of the switch electrode can be provided by blasting or machining, but the method for providing the unevenness is not particularly limited.
- the material for the switch electrode is not limited as long as it is a conductive material, but alumina-dispersed copper is particularly preferable.
- the surface roughness (Ra) of the flat surface having irregularities is preferably 60 to 150 ⁇ m. If the surface roughness (Ra) of the planar surface of the switch electrode is less than 60 ⁇ m, the change in the contact area between the electrodes due to repeated interruption of current tends to increase. If the surface roughness is larger than 150 ⁇ m, There is a tendency that the resistance of the electrode is increased, and the branch current when resistance welding is performed is decreased.
- the surface roughness (Ra) of the flat surface of the switch electrode can be measured using a commonly used surface roughness measuring device.
- the contact area ratio of the contact surface between the pair of electrodes is preferably 10 to 90%. If the contact area ratio of the switch electrode on the contact surface between the pair of electrodes is larger than 90%, the change in the contact area between the electrodes due to repeated interruption of current tends to increase. If it is less than%, the resistance of the switch electrode tends to increase, and the branch current during resistance welding tends to decrease.
- the contact area ratio on the contact surface between the pair of switch electrodes is measured using pressure sensitive paper.
- the pressure-sensitive paper is sandwiched between a pair of switch electrodes at a normal pressure during energization of current, and then the pair of switch electrodes are separated to measure the area of the colored portion of the pressure-sensitive paper.
- the ratio of the area of the colored portion of the pressure-sensitive paper to the area of the contact surface between the pair of switch electrodes is the contact area ratio of the contact surface between the pair of switch electrodes.
- FIG. 3 shows an example using a pair of switch electrodes of the present invention.
- a pair of switch electrodes of the present invention a cylindrical electrode having a diameter of 16 mm, a surface in contact with the other switch electrode is a flat surface, and a surface in contact with the other switch electrode is roughened by blasting.
- a pair of electrodes having a thickness (Ra) of 60 ⁇ m and a contact area ratio of 21% on the surface where the electrodes contact each other is used.
- the electrode material was alumina-dispersed copper, and the cutting of current of 2 to 4 kA was repeated.
- the set of switch electrodes according to the present invention hardly changes in resistance value due to repeated interruption of current.
- FIG. 4 shows an example using a conventional switch electrode.
- a conventional switch electrode a cylindrical electrode having a diameter of 16 mm, a flat electrode on a side in contact with the other switch electrode, and a cylindrical electrode having a diameter of 16 mm, and a side in contact with the other switch electrode (a dome-shaped electrode ( A pair of electrodes is used in which the tip of the electrode when viewed from the side has an R100 curve).
- the electrode material was alumina-dispersed copper, and the cutting of current of 2 to 4 kA was repeated.
- the resistance value of the conventional switch electrode suddenly decreases immediately after the start of current interruption, and the resistance value becomes stable by repeatedly interrupting the current. come. This is because, by repeatedly interrupting the current, the tip of the dome-shaped electrode is scraped off on the side in contact with the other switch electrode, and the area of the contact surface between the electrodes of the switch electrode is increased. it is conceivable that.
- the pair of switch electrodes of the present invention is used in a spot welding apparatus.
- the use of the pair of switch electrodes of the present invention is not limited to this, and resistance welding is not spot welding. It can be used for a resistance welding apparatus used when performing the process, and can be used for any switch that opens and closes current and an apparatus including the switch.
- the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
- FIG. 5 is a side view showing the configuration of the spot welding apparatus according to one embodiment of the present invention.
- the spot welding apparatus 1 according to the present embodiment is an electric spot welding apparatus attached to the tip of a robot arm 80.
- the spot welding apparatus 1 welds the workpiece W by pressurizing and pressing the workpiece W on which a plurality of plate materials are overlapped with each other with a plurality of electrodes to be described later.
- the spot welding apparatus 1 of this embodiment is used suitably for the welding of the workpiece
- the workpiece W in which the thinnest plate material W1, the plate material W2 (thick plate), and the plate material W3 (thick plate) are arranged from above is used.
- the spot welding apparatus 1 includes a spot welding gun 10 supported by a support portion 90 provided at the tip of a robot arm 80, and a control device 100 that controls the spot welding gun 10.
- the support unit 90 includes a support bracket 91.
- the support bracket 91 includes an upper plate 91a and a lower plate 91b parallel to the upper plate 91a.
- a guide bar 92 is bridged between the upper plate 91a and the lower plate 91b.
- the guide bar 92 is provided with a support plate 93 that is slidable in the axial direction.
- the support plate 93 extends in parallel to the upper plate 91a and the lower plate 91b from the robot arm 80 side, and supports the spot welding gun 10 on the tip side.
- a casing-like support body 94 is provided on the upper surface on the base end side of the support plate 93.
- a first coil spring 95 wound around the guide bar 92 is interposed between the upper plate 91a and the support 94.
- a second coil spring 96 wound around the guide bar 92 is interposed between the lower plate 91 b and the support plate 93.
- the spot welding gun 10 can be moved up and down relative to the support portion 90 by being supported by the support plate 93.
- the spot welding gun 10 includes a welding gun main body 11, a welding electrode portion 15 provided at the tip of the welding gun main body 11, and a current source 30A (see FIG. 6) for supplying a current to the welding electrode portion 15. .
- the welding gun body 11 includes a servo motor 16 provided on the upper portion thereof, and a feed screw mechanism (not shown) connected to the servo motor 16.
- the welding electrode unit 15 includes a movable electrode unit 120 and a fixed electrode unit 130.
- the movable electrode portion 120 protrudes downward from the tip of the welding gun body 11 and is supported by the tip of the rod 12 connected to the feed screw mechanism.
- the movable electrode portion 120 can move forward and backward with respect to the fixed electrode portion 130 described later by the rod 12 moving up and down (moving in the A2 direction or the A1 direction in FIG. 5) via the feed screw mechanism by the servo motor 16. ing.
- the movement amount of the rod 12 is supplied to the control device 100 and used for auxiliary current control described later.
- the fixed electrode portion 130 is supported by the tip of the C-shaped yoke 13 that extends downward from the connecting portion 14 connected to the tip of the welding gun body 11.
- the movable electrode portion 120 and the fixed electrode portion 130 are arranged to face each other with the workpiece W interposed therebetween, and are brought into contact with the workpiece W to energize the welded portion (hereinafter, referred to as the thinnest plate material W1, the plate material W2, and the plate material W3). "Nugget N").
- FIG. 6 is a diagram showing a configuration of the welding electrode portion 15 of the spot welding apparatus 1.
- the movable electrode portion 120 includes a welding electrode tip 121 and an auxiliary energization electrode tip 122 that energizes between the welding electrode tip 121.
- the welding electrode tip 121 and the auxiliary energizing electrode tip 122 have a dome-shaped columnar tip, and are arranged along the surface direction of the workpiece W with a predetermined interval.
- the tip portions of these electrode tips are arranged toward the upper surface of the workpiece W at substantially the same height, and press the upper surface of the workpiece W according to the vertical movement of the rod 12 (see FIG. 5).
- the auxiliary energizing electrode tip 122 is provided with a moving means composed of an air cylinder or the like, and is configured to be movable up and down independently of the rod 12. Further, the auxiliary energization electrode chip 122 is provided with a moving amount measuring means constituted by a laser displacement meter or the like, and is configured to be able to measure the moving amount of the vertical movement by the moving means. Further, the auxiliary energization electrode tip 122 is provided with an ammeter so that the value of the current flowing from the welding electrode tip 121 can be measured. The movement amount measured by the movement amount measuring means and the current value measured by the ammeter are supplied to the control device 100 and used for auxiliary current control described later.
- the fixed electrode portion 130 includes a main energizing electrode tip 131 that energizes between the welding electrode tip 121.
- the main energizing electrode tip 131 has a cylindrical shape with a dome-shaped tip.
- the tip portion of the main energizing electrode tip 131 is disposed toward the lower surface of the workpiece W, and the movable electrode portion 120 moves up and down in accordance with the vertical movement of the rod 12 (see FIG. 5), so Press the side surface.
- the current source 30 ⁇ / b> A is connected to the movable electrode unit 120 and the fixed electrode unit 130 configured as described above. Specifically, the welding electrode tip 121 is connected to the positive electrode of the current source 30A, and the auxiliary energizing electrode tip 122 and the main energizing electrode tip 131 are connected to the negative electrode of the current source 30A.
- the current source 30A includes a power source and a variable resistor (not shown) and supplies current between the electrode chips. Therefore, the current flowing from the current source 30 ⁇ / b> A through the welding electrode tip 121 into the workpiece W flows along the current path D ⁇ b> 1 and returns to the current source 30 ⁇ / b> A through the main energization electrode tip 131.
- the current flowing through the current path D1 (hereinafter sometimes referred to as “main current”) generates the nugget N around the heated portion by heating the vicinity of the center of the workpiece W in the thickness direction, and the workpiece W Weld. Further, the current flowing from the current source 30A through the welding electrode tip 121 into the workpiece W flows along the current paths D2 and D3, and returns to the current source 30A through the auxiliary energization electrode tip 122.
- the current flowing through the current paths D2 and D3 (hereinafter sometimes referred to as “auxiliary current”) is mainly generated by heating between the thinnest plate material W1 and the plate material W2 arranged on the outermost side of the workpiece W. The outermost thinnest plate material W1 is used for welding.
- the interface between the thinnest plate material W1 and the plate material W2 is not located near the center in the thickness direction of the workpiece W, but near the outside, and the nugget N is located near the center.
- the thinnest plate material W1 may not be welded only by the generated main current. Therefore, the outer thinnest plate material W1 is appropriately welded using the auxiliary energizing electrode tip 122.
- two auxiliary energization electrode tips 122 are provided.
- the present invention is not limited to this. If the outer thinnest plate material W1 can be welded, only one electrode tip 122 may be provided. Three or more may be provided.
- the auxiliary energizing electrode tip 122 includes a switch for releasing the electrical connection with the welding electrode tip 121, a variable resistor for changing the auxiliary current flowing from the welding electrode tip 121, and the like. It is good also as providing.
- the control device 100 controls the servo motor 16 and the current source 30A. Further, as will be described later, the control device 100 measures the state of the auxiliary energization electrode tip 122 and controls the auxiliary energization electrode tip 122 and the current source 30A according to the measurement result. Note that the state of the auxiliary energization electrode tip 122 includes a movement amount measured by the movement amount measuring unit and a current value measured by an ammeter.
- the spot welding gun 10 is moved to the welding site of the workpiece W by the operation of the robot arm 80 and the support unit 90 in a state where the movable electrode unit 120 is separated from the fixed electrode unit 130. Specifically, the spot welding gun 10 is moved to a position where the distal end portion of the main energizing electrode tip 131 of the fixed electrode portion 130 abuts on the lower surface of the welding portion of the workpiece W.
- the control device 100 controls the servo motor 16 to advance the movable electrode portion 120 relative to the workpiece W by the action of the feed screw mechanism. Then, the tip portions of the welding electrode tip 121 and the auxiliary energizing electrode tip 122 abut on the upper surface of the workpiece W. At this time, when the spot welding gun 10 is inclined with respect to the workpiece W, both tip portions of the welding electrode tip 121 and the auxiliary energizing electrode tip 122 are not properly in contact with the upper surface of the workpiece W.
- the control device 100 controls the moving means provided on the auxiliary energizing electrode chip 122 independently of the servo motor 16. Thereby, even if the spot welding gun 10 is inclined with respect to the workpiece W, the tip portion of each electrode tip can be reliably brought into contact with the upper surface of the workpiece W.
- the control device 100 further advances the movable electrode portion 120 with respect to the workpiece W in a state where the tip portion of each electrode tip is in contact with the surface of the workpiece W. Then, the workpiece
- the control device 100 supplies the current by controlling the current source 30A while maintaining the pressurization by the tip of each electrode tip. Then, a main current flows from the welding electrode tip 121 to the main energizing electrode tip 131 along the current path D1, and an auxiliary current flows from the welding electrode tip 121 to the auxiliary energizing electrode tip 122 along the current paths D2 and D3. Flows. Thereby, from the center part of the thickness direction of the workpiece
- the control device 100 controls the current source 30A to stop the supply of current.
- the control device 100 stops the auxiliary current prior to the main current. Also good. Specifically, the control device 100 releases the energization state between the welding electrode tip 121 and the auxiliary energization electrode tip 122 by turning off the switch provided in the auxiliary energization electrode tip 122, and the auxiliary current To stop.
- the control device 100 controls the servo motor 16 to retract the movable electrode portion 120 with respect to the workpiece W by the action of the feed screw mechanism. As a result, the nugget is cooled and solidified, and the workpiece W is welded.
- ⁇ Auxiliary current control according to the contact angle with the workpiece W> In the spot welding apparatus 1 according to the present embodiment, when the spot welding gun 10 is in contact with the workpiece W while being inclined, the spot welding device 1 flows from the welding electrode tip 121 to the auxiliary energizing electrode tip 122 according to the contact angle. Control the auxiliary current. An outline of the control of the auxiliary current according to the contact angle with the workpiece W is shown in FIG.
- the nugget N being inclined as the spot welding gun 10 is inclined, as shown in FIG. 7B, the nugget N covering the interface between the thinnest plate material W1 and the plate material W2 with a region L2 smaller than the region L1.
- the thinnest plate material W1 disposed on the uppermost side cannot be appropriately welded.
- the reason why the nugget N is inclined in this way is considered to be because the contact portion P of the welding electrode tip 121 and the main energizing electrode tip 131 with the work W is displaced from the central axis C. That is, the contact portion P of the workpiece W is cooled by contact with the electrode tip.
- this cooling portion being deviated from the central axis C, the generated nugget N is asymmetric with respect to the central axis C and is inclined. It will be.
- the spot welding apparatus 1 controls the auxiliary current according to the contact angle ⁇ of the spot welding gun 10 as shown in FIGS.
- the contact angle ⁇ of the spot welding gun 10 can be calculated from the amount of movement of the auxiliary energizing electrode tip 122 independently of the rod 12 (welding electrode tip 121). Therefore, the control apparatus 100 controls the electric current with respect to the auxiliary electricity supply electrode tip 122 according to the movement amount of the auxiliary electricity supply electrode tip 122 moved independently of the rod 12 (welding electrode tip 121). More specifically, an auxiliary current having a higher current value than normal is supplied to the auxiliary energizing electrode tip 122 that has moved in the minus direction (A2 direction in FIG.
- FIG. 7 (3) shows an example in which two auxiliary energizing electrode tips 122 are provided, but the same applies to the case where one or more auxiliary energizing electrode tips 122 are provided.
- the control device 100 controls the auxiliary current for the auxiliary energizing electrode tip 122 in accordance with the amount of movement of the auxiliary energizing electrode tip 122.
- auxiliary current control according to the auxiliary current value>
- the thinnest plate material W1, the plate material W2, and the plate material W3 forming the workpiece W are sandwiched and pressed between the movable electrode portion 120 and the fixed electrode portion 130.
- some of the workpieces W are in contact with the thinnest plate material W1, the plate material W2, and the plate material W3 not only at the welding location but also at other locations.
- the electrode tips are electrically connected to each other through the contact portion by pressurization of the movable electrode portion 120 and the fixed electrode portion 130, and an unexpected current path is formed. .
- the spot welding apparatus 1 of the present embodiment controls the auxiliary current according to the auxiliary current value flowing between the electrode tips, particularly between the welding electrode tip 121 and the auxiliary energizing electrode tip 122.
- An outline of the control of the auxiliary current according to the auxiliary current value is shown in FIG. In FIG. 8, the case where one auxiliary energizing electrode chip 122 is provided is shown as an example.
- the control device 100 is similar to the case where two or more auxiliary energizing electrode chips 122 are provided.
- the auxiliary current is controlled according to the auxiliary current value.
- each electrode tip Between the current path scheduled for welding, that is, the current path D1 between the welding electrode tip 121 and the main energizing electrode tip 131, and between the welding electrode tip 121 and the auxiliary energizing electrode tip 122. A current path D2 therebetween is formed. In this way, when the workpiece W is in normal contact, the current supplied from the current source 30A flows through the current paths D1 and D2. In FIG.
- a 5KA main current flows in the current path D1 from the welding electrode tip 121 to the main energizing electrode tip 131, and a 3KA auxiliary current is supplied. It flows in the current path D2 from the welding electrode tip 121 to the auxiliary energizing electrode tip 122.
- abnormal contact when there is a contact location other than the weld location on the workpiece W (hereinafter, sometimes referred to as “abnormal contact”), the electrode tips are scheduled for welding. In addition to the current path, a current path that flows through the abnormal contact point is formed.
- a current path D4 flowing from the welding electrode tip 121 through the abnormal contact point Q to the main energizing electrode tip 131 is formed. .
- the current path between the welding electrode tip 121 and the main energizing electrode tip 131 becomes wide (the current path D1 becomes the current path D1 + D4). Therefore, the resistance of the current path becomes low. As a result, sufficient Joule heat cannot be generated in the current path, and the workpiece W cannot be appropriately welded.
- the spot welding apparatus 1 of the present embodiment controls the auxiliary current according to the current value of the current flowing through the auxiliary energizing electrode tip 122 as shown in FIG. 8 (3) (A).
- the current value (1KA) of the auxiliary current reduced by forming the current path D4 passing through the abnormal contact point Q is originally planned.
- the current value supplied from the current source 30A is controlled to be (3KA). That is, the control device 100 lowers the variable resistance of the current source 30A and raises the total current value of the current supplied from the current source 30A from 8KA to 11KA, whereby the current of the auxiliary current flowing through the auxiliary energization electrode chip 122 is obtained. We are going to raise the value.
- the nugget N grows sufficiently. That is, the nugget N that did not grow sufficiently in FIG. 8B grows into a nugget N that is large enough to weld the workpiece W as shown in FIGS. As a result, the welding result can always be made constant regardless of the contact state inside the workpiece W that cannot be determined from the appearance.
- the spot welding apparatus 1 is in the state of the auxiliary energizing electrode tip 122, that is, the contact angle of the auxiliary energizing electrode tip 122 to the work W and the auxiliary energizing electrode tip.
- the workpiece W is appropriately welded by controlling the auxiliary current according to the current value of the auxiliary current flowing through the electrode tip 122.
- the details of the auxiliary current control according to the state of the auxiliary energizing electrode tip 122 will be described with reference to FIG.
- the nugget N for welding the workpiece W is generated by Joule heat
- the current value of the auxiliary current FIG.
- auxiliary current control is performed.
- the auxiliary current control described below is merely an example, and the present invention can be applied to other controls that can appropriately perform welding on the outermost thin plate material W1 according to the state of the auxiliary energization electrode tip 122. It is.
- the spot welding apparatus 1 raises the electric current value of the auxiliary current flowing through the auxiliary energizing electrode tip 122 when welding using the auxiliary energizing electrode tip 122 is insufficient.
- the workpiece W is appropriately welded.
- the control device 100 of the spot welding apparatus 1 supplies an auxiliary current having a high current value to the auxiliary energization electrode tip 122 by controlling a variable resistance in the auxiliary energization electrode tip 122.
- FIGS. 9A and 9A the case where the auxiliary energizing electrode tip 122 is in contact with the workpiece W in an inclined state will be described.
- the control device 100 calculates the amount of movement of the auxiliary energization electrode tip 122 that moves independently of the rod 12, and specifies whether the movement is in the minus direction or the plus direction. Subsequently, the control device 100 lowers the variable resistance in the auxiliary energization electrode tip 122 that has moved in the negative direction and increases the value of the auxiliary current flowing through the auxiliary energization electrode tip 122 while increasing the value in the positive direction. The variable resistance in the moved auxiliary energization electrode tip 122 is increased, and the value of the auxiliary current flowing through the auxiliary energization electrode tip 122 is decreased.
- the control device 100 acquires the current value of the auxiliary current flowing through the auxiliary energization electrode tip 122 and determines whether or not it is equal to or less than a normal value (eg, 3KA).
- a normal value eg, 3KA
- the control device 100 determines that there is an abnormal contact portion on the workpiece W and increases the auxiliary current flowing through the auxiliary energization electrode tip 122. That is, the control device 100 reduces the variable resistance in the auxiliary energization electrode tip 122 so that the auxiliary current easily flows through the auxiliary energization electrode tip 122. Thereby, even if it is a case where the abnormal contact location exists in the workpiece
- the control device 100 After supplying the auxiliary current to the auxiliary energization electrode tip 122 for a time sufficient to weld the outermost thin plate material W1, the control device 100 performs the auxiliary energization electrode. The energization to the chip 122 is stopped. Thereby, since the current value of the main current flowing through the main energizing electrode tip 131 is increased, not only the outermost thin plate material W1 but also the entire workpiece W can be appropriately welded.
- the increase in the current value of the auxiliary current is not limited to the control of the variable resistance in the auxiliary energizing electrode tip 122, but the current supplied from the current source 30A is increased. But it can be realized. Therefore, the control device 100 of the spot welding apparatus 1 may supply an auxiliary current having a high current value to the auxiliary energization electrode tip 122 by controlling a variable resistance in the current source 30A.
- FIGS. 9 (2) and 9 (A) the case where the auxiliary energizing electrode tip 122 is in contact with the workpiece W in an inclined state will be described.
- the control device 100 When in contact with the workpiece W at an angle, the control device 100 controls the variable resistance in the current source 30A to increase the total current value of the current flowing through the current path connecting the electrode chips. As a result, a current having a higher value than usual flows in the current path connecting the electrode tips, and the outer thinnest plate material W1 that is difficult to weld as a result of the inclination can be appropriately welded. At this time, the control device 100 may change the timing of stopping energization of the auxiliary energization electrode tip 122 according to the contact angle.
- the energization of the auxiliary energization electrode tip 122 moved in the plus direction with respect to the rod 12 is stopped first, and then the energization of the auxiliary energization electrode tip 122 moved in the minus direction with respect to the rod 12 is performed for a predetermined time. After that, the energization of the auxiliary energization electrode tip 122 may be stopped.
- FIGS. 9 (2) and 9 (B) a case where an abnormal contact location exists on the workpiece W will be described.
- the control device 100 controls the variable resistance in the current source 30A and the current flowing through the current path connecting the electrode tips. Increase the total current value. Thereby, the current value of the auxiliary current that decreases by the amount that flows to the abnormal contact location can be compensated, and the thinnest plate material W1 disposed on the outside can be appropriately welded.
- the spot welding apparatus 1 sets the duration of the auxiliary current to the auxiliary energizing electrode tip 122.
- the workpiece W is appropriately welded by controlling. More specifically, the control device 100 of the spot welding apparatus 1 controls the energization time to the auxiliary energization electrode tip 122 by controlling a switch in the auxiliary energization electrode tip 122. A case where the auxiliary energizing electrode tip 122 is in contact with the workpiece W in an inclined state will be described with reference to FIGS.
- the control device 100 first starts energizing the auxiliary energizing electrode tip 122, then first switches off the auxiliary energizing electrode tip 122 that has moved in the plus direction with respect to the rod 12, and then a predetermined time has elapsed. After that, the switch in the auxiliary energizing electrode tip 122 that has moved in the minus direction with respect to the rod 12 is turned off.
- an auxiliary current can be supplied for a long time to the auxiliary current conducting electrode chip 122 side in the negative direction, in which the nugget N is difficult to be generated in the interface between the thinnest plate material W1 and the plate material W2.
- the outermost thin plate material W1 can be appropriately welded.
- control device 100 stops the energization after supplying an auxiliary current to the auxiliary energizing electrode tip 122 for a time necessary to generate sufficient nugget N at the interface between the thinnest plate material W1 and the plate material W2. .
- the control device 100 stops the energization after supplying an auxiliary current to the auxiliary energizing electrode tip 122 for a time necessary to generate sufficient nugget N at the interface between the thinnest plate material W1 and the plate material W2. .
- the spot welding apparatus 1 has been described above.
- the state of the workpiece W is specified by measuring the state of the auxiliary energizing electrode tip 122. That is, the contact angle to the workpiece W is specified from the amount of movement of the auxiliary energizing electrode tip 122 independently of the rod 12 (welding electrode tip 121), and the auxiliary current flowing through the auxiliary energizing electrode tip 122 is determined. It is specified from the current value of the current whether or not there is an abnormal contact location on the workpiece W.
- the spot welding apparatus 1 if the state of the workpiece
- auxiliary current control for controlling the variable resistance of the auxiliary energization electrode tip 122 (FIG. 9 (1)) and current control for controlling the variable resistance of the current source 30A (FIG. 9). (2)) and the turn-off timing control (FIG. 9 (3)) for controlling the switch of the auxiliary energization electrode tip 122 have been described.
- only one of these controls is applied as the auxiliary current control.
- a plurality of combinations may be applied. In this case, applying in combination includes changing the current value before and after the auxiliary energization electrode tip 122 is switched off.
- the total current value may be the same before and after the auxiliary energization electrode tip 122 is turned off, and before the switch is turned off.
- the total current value may be higher when the switch is turned off, or the total current value may be higher after the switch is turned off.
- work W has an abnormal contact location are demonstrated separately.
- the present invention is also applicable when the respective states are superimposed. That is, the present invention can be applied even when the spot welding gun 10 is in contact with the workpiece W while being inclined and there is an abnormal contact portion on the workpiece W.
- the contact angle of the spot welding gun 10 to the workpiece W is determined by the amount of movement of the welding electrode tip 121 (that is, the amount of movement of the rod 12) and the amount of movement of the auxiliary energizing electrode tip 122 (that is, The calculation is based on the difference between the movement amount of the rod 12 and the movement amount of the moving means), but is not limited thereto.
- the spot on the workpiece W is determined from the difference in the moving amounts of the auxiliary energizing electrode tips 122 without using the moving amount of the welding electrode tips 121.
- the contact angle of the welding gun 10 may be calculated.
- work W may be calculated using image data obtained by photographing the spot welding gun 10 and / or the workpiece W at the time of contact.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Resistance Welding (AREA)
Abstract
Description
また、本発明は、スポット溶接装置及びスポット溶接方法に関する。詳しくは、厚みが最小である板材を最外に配置して形成したワークに対して溶接を行うスポット溶接装置及びスポット溶接方法に関する。
例えば、ワークに対して電極チップが傾斜して当接していた場合には、垂直に当接していた場合と比べてナゲットが傾斜した状態で生成されてしまう。ナゲットが傾斜してしまうと、ワークの外側近傍に位置する最薄板材と隣接する板材との間の界面をナゲットが十分に覆うことができず、最薄板材を適切に溶接できなくなる。
また、ワーク内部に溶接箇所以外に板材同士が接触している箇所が存在すると、当該接触箇所にも電流が流れてしまい、補助電極チップに流れる電流が減少してしまう。その結果、最薄板材と隣接する板材との間の界面に十分なナゲットが生成されず、最薄板材を適切に溶接できなくなる。
また、本発明は、ワークの外側に配置された最薄板材を適切に溶接するスポット溶接装置及びスポット溶接方法を提供することも目的とする(第2の目的)。
スパークの発生によって電極表面が傷つくことを許容し、逆に、電極同士が接触する面に凹凸加工を施すことで、スイッチによって電流を繰り返し遮断しても、スイッチ用電極同士の接触面積はほとんど変化することがなくなり、抵抗値の変化の少ない一対のスイッチ用電極を提供できる。
これにより、最薄板材に対して溶接用電極及び補助通電用電極が傾斜して当接していた場合に補助通電用電極に流れる電流を異ならせることができるため、従来、傾斜により最薄板材と隣接する板材との間の界面を十分に覆うことのできなかったナゲットを成長させることができ、最薄板材を適切に溶接することができる。ここで、溶接用電極及び補助通電用電極の最薄板材への当接角度は、例えば、溶接用電極が最薄板材に当接するために移動した移動量(例えば、後述のロッド12の移動量)と補助通電用電極が最薄板材に当接するために移動した移動量(例えば、後述のロッド12の移動量+後述の移動手段の移動量)との差から算出することができる。
これにより、外見からは判断できないワーク内部の接触状態に合わせて補助通電用電極への電流を制御することができ、最薄板材を適切に溶接することができる。
また、本発明によれば、ワークの外側に配置された最薄板材を適切に溶接することができる。
以下、本発明の一実施形態について、図面を参照しながら説明する。
図1は、本発明の一実施形態に係る一組のスイッチ用電極を有するスイッチを用いたスポット溶接装置の構成を示す側面図である。スポット溶接装置1は、ロボットアーム80の先端に取り付けられた電動式のスポット溶接装置である。
スポット溶接装置1は、複数の板材W1(薄板)、W2(厚板)及びW3(厚板)を重ね合わせたワークWを、後述する複数の電極で挟んで加圧し、この状態で電極間に通電することでワークWを溶接するものである。
溶接ガン本体11は、その上部に設けられたサーボモータ16と、このサーボモータ16に連結された図示しない送りねじ機構と、備える。
溶接用電極部15は、可動電極部120と、固定電極部130と、を含んで構成される。
固定電極部130は、溶接ガン本体11の先端に連結された連結部14から下方に延びるC形ヨーク13の先端に支持されている。
これら可動電極部120と固定電極部130は、ワークWを挟んで対向配置される。可動電極部120は溶接用電極チップ121と補助通電用電極チップ122を備え、固定電極部130は主通電用電極チップ131とを備え、溶接用電極チップ121、補助通電用電極チップ122及び主通電用電極チップ131はワークWを加圧、挟持する。
可動電極部120の備える溶接用電極チップ121と補助通電用電極チップ122の先端面の高さ位置は、略同一となっている。
溶接用電極チップ121と補助通電用電極チップ122は、所定の間隔を設けて、ワークWの面方向に沿って配置されている。これら電極チップは、円柱状であり、溶接用電極チップ121の先端はドーム状となっている。
固定電極部130の備える主通電用電極チップ131は、ワークWを挟んで溶接用電極チップ121の対向に配置される。主通電用電極チップ131は、円柱状であり、その先端はドーム状となっている。
先ず、可動電極部120を固定電極部130に対して離間させた状態で、ロボットアーム80及び支持部90の動作により、ワークWの溶接部位にスポット溶接ガン10を移動させる。具体的には、固定電極部130の主通電用電極チップ131の先端面が、ワークWの溶接部位の下面に当接する位置に、スポット溶接ガン10を移動させる。
前述したように、スイッチ20の第1スイッチ用電極チップ21及び第2スイッチ用電極チップ22が接触することで通電をし、離間することで電流を遮断する。スイッチ20は、抵抗溶接で使用される大容量の電流を遮断することから、電極同士を離間する際にはスパークが発生してしまう。電流を遮断する際のスパークの発生は電極表面を傷つけ、磨耗させてしまうことから好ましくない。スパークの発生を防止するために、スパーク防止機構を設けることもできるが、抵抗溶接を行うような大きな電流では、スパーク防止機構で完全にスパークの発生を抑えることは難しい。また、電極表面にめっき等を施した場合でも、抵抗溶接装置に用いる場合のように何千回、何万回と繰り返し使用することで、電極表面が磨耗してしまう。逆に、初期の電極表面をなめらかにすればするほど初期のスイッチ用電極と、繰り返し使用した後のスイッチ用電極の抵抗値に大きな差がでてしまい、抵抗溶接をする際の電流量の設定が難しくなるという問題もある。抵抗溶接をする際の電流量の設定が難しいと、安定した品質の溶接されたワーク材の提供も難しくなってしまう。
図3は本発明の一対のスイッチ用電極を用いた例である。本発明の一対のスイッチ用電極の例として、直径16mmの円柱状の電極で、他方のスイッチ用電極と接する側が平面で、且つ、他方のスイッチ用電極と接触する面がブラスト処理によって、表面粗さ(Ra)が60μm、電極同士の接触する面における接触面積比率が21%に調整されている電極が一対用いられている。電極の素材はアルミナ分散銅であり、2~4kAの電流の切断を繰り返した。
また、本発明は上記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれる。
続いて、本発明の別実施形態について、図5~図9を参照して説明する。
図5は、本発明の一実施形態に係るスポット溶接装置の構成を示す側面図である。本実施形態に係るスポット溶接装置1は、ロボットアーム80の先端に取り付けられた電動式のスポット溶接装置である。
スポット溶接装置1は、複数の板材を重ね合わせたワークWを、後述する複数の電極で挟んで加圧し、この状態で電極間に通電することでワークWを溶接する。なお、本実施形態のスポット溶接装置1は、3枚以上の板材により形成され、且つ最も外側に最薄板材が配置されたワークWの溶接に好適に用いられる。このようなワークWの一例として、本実施形態では、上方から最薄板材W1、板材W2(厚板)及び板材W3(厚板)を配置したワークWを用いることとしている。
溶接ガン本体11は、その上部に設けられたサーボモータ16と、このサーボモータ16に連結された図示しない送りねじ機構と、備える。
溶接用電極部15は、可動電極部120と、固定電極部130と、を含んで構成される。
固定電極部130は、溶接ガン本体11の先端に連結された連結部14から下方に延びるC形ヨーク13の先端に支持されている。
これら可動電極部120と固定電極部130とは、ワークWを挟んで対向配置され、ワークWと接触させて通電させることにより、最薄板材W1、板材W2及び板材W3間に溶接部(以下、「ナゲットN」と呼ぶ)を形成する。
可動電極部120は、溶接用電極チップ121と、この溶接用電極チップ121との間で通電する補助通電用電極チップ122と、を備える。
溶接用電極チップ121及び補助通電用電極チップ122は、先端部がドーム状の円柱形状であり、所定の間隔を設けてワークWの面方向に沿って配置される。また、これら電極チップの先端部は、略同一の高さ位置でワークWの上側表面に向けて配置され、ロッド12(図5参照)の上下動に応じてワークWの上側表面を押圧する。
主通電用電極チップ131は、先端部がドーム状の円柱形状である。主通電用電極チップ131の先端部は、ワークWの下側表面に向けて配置され、ロッド12(図5参照)の上下動に応じて可動電極部120が上下動することでワークWの下側表面を押圧する。
なお、電流源30Aは、図示しない電源と可変抵抗とを備え、各電極チップ間に電流を供給する。
そのため、電流源30Aから溶接用電極チップ121を経てワークWに流入する電流は、電流経路D1に沿って流れ、主通電用電極チップ131を経て電流源30Aに戻る。このような電流経路D1を流れる電流(以下、「主電流」と呼ぶことがある)は、ワークWの厚み方向中心付近を加熱することで当該加熱部分を中心にナゲットNを生成し、ワークWを溶接する。
また、電流源30Aから溶接用電極チップ121を経てワークWに流入する電流は、電流経路D2,D3に沿って流れ、補助通電用電極チップ122を経て電流源30Aに戻る。このような電流経路D2,D3を流れる電流(以下、「補助電流」と呼ぶことがある)は、主としてワークWの最外側に配置された最薄板材W1及び板材W2の間を加熱することで、最外側の最薄板材W1を溶接するために用いられる。即ち、最も外側に最薄板材W1を配置した場合には、最薄板材W1及び板材W2の界面がワークWの厚み方向中心付近ではなく外側近傍に位置することになり、中心付近にナゲットNを生成する主電流だけでは最薄板材W1を溶接できないことがある。そこで、補助通電用電極チップ122を用いて外側の最薄板材W1を適切に溶接することとしている。
次に、本実施形態に係るスポット溶接装置1の基本的な動作について説明する。
先ず、可動電極部120を固定電極部130に対して離間させた状態で、ロボットアーム80及び支持部90の動作により、ワークWの溶接部位にスポット溶接ガン10を移動させる。具体的には、固定電極部130の主通電用電極チップ131の先端部が、ワークWの溶接部位の下側表面に当接する位置に、スポット溶接ガン10を移動させる。
次いで、制御装置100は、サーボモータ16を制御して、送りねじ機構の作用で可動電極部120をワークWに対して後退させる。これにより、ナゲットが冷却固化し、ワークWが溶接される。
次に、本実施形態に係るスポット溶接装置1の特徴的な動作の概要を図7及び図8を参照して説明する。
本実施形態のスポット溶接装置1は、ワークWに対してスポット溶接ガン10が傾斜して当接している場合に、当接角度に応じて溶接用電極チップ121から補助通電用電極チップ122に流れる補助電流を制御する。このワークWへの当接角度に応じた補助電流の制御の概要を図7に示す。
ところが、ワークWに対してスポット溶接ガン10が傾斜して当接している場合には、最薄板材W1を溶接するために十分なナゲットNが生成されない。即ち、スポット溶接ガン10の傾斜に伴いナゲットNが傾斜してしまう結果、図7(2)に示すように、最薄板材W1及び板材W2の界面を領域L1よりも小さい領域L2で覆うナゲットNしか生成することができず、最も上側に配置された最薄板材W1を適切に溶接することができない。
なお、このようにナゲットNが傾斜してしまうのは、溶接用電極チップ121及び主通電用電極チップ131のワークWとの当接部分Pが中心軸Cからずれてしまうためと考えられる。即ち、ワークWの当接部分Pは電極チップとの当接により冷却されることになるが、この冷却部分が中心軸Cからずれる結果、生成されるナゲットNが中心軸Cと非対称となり傾斜することになる。
なお、図7(3)は、補助通電用電極チップ122を2つ設けた場合を例にとり図示しているが、補助通電用電極チップ122を1つ又は3つ以上設けた場合についても同様に、制御装置100は、補助通電用電極チップ122の移動量に応じて補助通電用電極チップ122に対する補助電流を制御する。
通常、ワークWを形成する最薄板材W1,板材W2,板材W3は、可動電極部120及び固定電極部130に挟持され加圧される結果、溶接箇所が接触し電気的に接続される。しかしながら、ワークWの中には溶接箇所だけでなく他の箇所でも最薄板材W1,板材W2,板材W3が接触しているものがある。このようなワークWでは、可動電極部120及び固定電極部130の加圧により当該接触箇所を介して各電極チップ間が電気的に接続されることになり、予期せぬ電流経路が形成される。このような予期せぬ電流経路が形成されると、電流源30Aから供給される電流が当該電流経路にも流れてしまい、ワークWの溶接のために予定している電流経路を流れる電流値が減少してしまう。
そこで、本実施形態のスポット溶接装置1は、各電極チップ間、特に溶接用電極チップ121と補助通電用電極チップ122との間を流れる補助電流値に応じて、補助電流を制御する。この補助電流値に応じた補助電流の制御の概要を図8に示す。なお、図8では、補助通電用電極チップ122を1つ設けた場合を例にとり図示しているが、補助通電用電極チップ122を2つ以上設けた場合についても同様に、制御装置100は、補助電流値に応じて補助電流を制御する。
また、異常接触箇所Qが溶接箇所の近傍にある場合には、溶接用電極チップ121と主通電用電極チップ131との間の電流経路が広くなってしまい(電流経路D1が電流経路D1+D4になってしまい)、当該電流経路の抵抗が低くなってしまう。その結果、当該電流経路に十分なジュール熱を発生させることができず、ワークWを適切に溶接することができない。
以上、図7及び図8に示すように本実施形態に係るスポット溶接装置1は、補助通電用電極チップ122の状態、即ち補助通電用電極チップ122のワークWへの当接角度や補助通電用電極チップ122に流れる補助電流の電流値に応じて、補助電流を制御することでワークWを適切に溶接する。
続いて、図9を参照して、補助通電用電極チップ122の状態に応じた補助電流制御の詳細について説明する。ここで、ワークWを溶接するためのナゲットNはジュール熱により生成されるため、本実施形態では、補助電流の電流値(図9(1)(2))及び/又は補助電流の供給時間(図9(3))を制御することで、補助電流制御を行うこととしている。なお、以下に示す補助電流制御は一例に過ぎず、本発明は、補助通電用電極チップ122の状態に応じて外側の最薄板材W1に対する溶接を適切に行うことのできる他の制御に適用可能である。
図9(1)(A)を参照して、補助通電用電極チップ122がワークWに対して傾斜した状態で当接している場合について説明する。初めに、制御装置100は、ロッド12とは独立して移動する補助通電用電極チップ122の移動量を算出し、当該移動がマイナス方向であるかプラス方向であるかを特定する。続いて、制御装置100は、マイナス方向に移動した補助通電用電極チップ122内の可変抵抗を低くし、当該補助通電用電極チップ122に流れる補助電流の電流値を高くする一方で、プラス方向に移動した補助通電用電極チップ122内の可変抵抗を高くし、補助通電用電極チップ122に流れる補助電流の電流値を低くする。これにより、補助通電用電極チップ122に流れる補助電流の電流値を当接角度に応じて制御することができ、外側に配置された最薄板材W1を適切に溶接することができる。
次に、図9(1)(B)を参照して、ワークWに異常接触箇所が存在する場合について説明する。初めに、制御装置100は、補助通電用電極チップ122に流れる補助電流の電流値を取得し、正常値(例えば3KA)以下であるか否かを判定する。このとき、補助電流の電流値が正常値以下である場合には、制御装置100は、ワークWに異常接触箇所が存在すると判断し、補助通電用電極チップ122に流れる補助電流を高くする。即ち、制御装置100は、当該補助通電用電極チップ122内の可変抵抗を低くし、補助通電用電極チップ122に補助電流が流れ易くする。これにより、ワークWに異常接触箇所が存在する場合であっても外側に配置された最薄板材W1を適切に溶接することができる。
なお、詳細な説明は省略するが、外側の最薄板材W1を溶接するのに十分な時間だけ補助通電用電極チップ122に補助電流を流した後には、制御装置100は、当該補助通電用電極チップ122への通電を停止する。これにより、主通電用電極チップ131に流れる主電流の電流値が高くなるため、外側の最薄板材W1だけでなくワークW全体を適切に溶接することができる。
図9(2)(A)を参照して、補助通電用電極チップ122がワークWに対して傾斜した状態で当接している場合について説明する。ワークWに傾斜して当接している場合、制御装置100は、電流源30A内の可変抵抗を制御し、各電極チップ間を結ぶ電流経路を流れる電流の総電流値を上昇させる。これにより、各電極チップ間を結ぶ電流経路には、通常よりも高い値の電流が流れることになり、傾斜の結果溶接しにくい外側の最薄板材W1を適切に溶接することができる。このとき、制御装置100は、当接角度に応じて補助通電用電極チップ122への通電を停止するタイミングを異ならせることとしてもよい。即ち、ロッド12に対してプラス方向に移動した補助通電用電極チップ122に対する通電を先に停止し、その後、ロッド12に対してマイナス方向に移動した補助通電用電極チップ122に対する通電を所定時間行った後、当該補助通電用電極チップ122に対する通電を停止することとしてもよい。
次に、図9(2)(B)を参照して、ワークWに異常接触箇所が存在する場合について説明する。制御装置100は、補助通電用電極チップ122に流れる補助電流の電流値が正常値以下である場合には、電流源30A内の可変抵抗を制御し、各電極チップ間を結ぶ電流経路を流れる電流の総電流値を上昇させる。これにより、異常接触箇所に流れてしまう分減少する補助電流の電流値を補うことができ、外側に配置された最薄板材W1を適切に溶接することができる。
図9(3)(A)を参照して、補助通電用電極チップ122がワークWに対して傾斜した状態で当接している場合について説明する。ロッド12に対してマイナス方向に移動した補助通電用電極チップ122に対しては、十分なジュール熱を確保すべく通常よりも長時間にわたり補助電流を通電する必要がある。そこで、制御装置100は、補助通電用電極チップ122への通電を開始した後、ロッド12に対してプラス方向に移動した補助通電用電極チップ122内のスイッチを先に切り、その後、所定時間経過した後にロッド12に対してマイナス方向に移動した補助通電用電極チップ122内のスイッチを切る。これにより、傾斜して当接した結果、最薄板材W1及び板材W2の界面のうちナゲットNを生成しにくいマイナス方向の補助通電用電極チップ122側に長時間補助電流を供給することができ、外側の最薄板材W1を適切に溶接することができる。
次に、図9(3)(B)を参照して、ワークWに異常接触箇所が存在する場合について説明する。制御装置100は、補助通電用電極チップ122に流れる補助電流の電流値が正常値以下である場合には、通常よりも遅く補助通電用電極チップ122内のスイッチを切る。即ち、制御装置100は、最薄板材W1及び板材W2の界面に十分なナゲットNを生成するために必要な時間だけ補助通電用電極チップ122に対して補助電流を通電した後に当該通電を停止する。これにより、異常接触箇所に流れてしまう分減少する補助電流を補うことができ、外側に配置された最薄板材W1を適切に溶接することができる。
このとき、組み合わせて適用するとは、補助通電用電極チップ122のスイッチを切る前後において電流値を異ならせることを含むものである。即ち、例えば、電流制御と切タイミング制御とを組み合わせる場合には、補助通電用電極チップ122のスイッチを切る前と後とで総電流値が同じであることとしてもよく、また、スイッチを切る前の方が総電流値が高くなることとしてもよく、また、スイッチを切った後の方が総電流値が高くなることとしてもよい。
また、各電極チップの移動量を用いることなく、その他の情報を用いてワークWへのスポット溶接ガン10の当接角度を算出することとしてもよい。一例として、当接時のスポット溶接ガン10及び/又はワークWを撮影した画像データを用いて、ワークWへのスポット溶接ガン10の当接角度を算出することとしてもよい。
10…スポット溶接ガン
20…スイッチ(通電手段)
21…第1スイッチ用電極チップ
22…第2スイッチ用電極チップ
30…電源(通電手段)
30A…電流源
100…制御装置(通電手段、補助電流制御手段)
12…ロッド
120A…可動電極部
121…溶接用電極チップ(第1溶接用電極、溶接用電極)
122…補助通電用電極チップ(補助電極、補助通電用電極)
13…C形ヨーク
130A…固定電極部
131…主通電用電極チップ(第2溶接用電極、主通電用電極)
W…ワーク
Claims (10)
- 一対の電極から構成され、これら一対の電極同士を面接触させることで通電し、且つ離間させることで通電を遮断するスイッチに用いられるスイッチ用電極であって、
前記一対の電極同士が接触する面のうち少なくとも一方が、凹凸を有する平面であることを特徴とするスイッチ用電極。 - 前記平面の表面粗さ(Ra)が60~150μmであることを特徴とする請求項1に記載のスイッチ用電極。
- 前記一対の電極同士の接触する面における接触面積比率が10~90%であることを特徴とする請求項1又は2に記載のスイッチ用電極。
- 複数の板材を重ね合わせて形成されたワークを抵抗溶接する抵抗溶接装置であって、
前記ワークの一方の面に当接する第1溶接用電極と、
前記第1溶接用電極とは反対側から前記ワークに当接し、且つ前記第1溶接用電極とは逆の極性を有する第2溶接用電極と、
前記第1溶接用電極と同じ側から前記ワークに当接し、且つ前記第1溶接用電極とは逆の極性を有する補助電極と、
前記第1溶接用電極、前記第2溶接用電極及び前記補助電極により前記ワークを挟持加圧した状態で、前記第1溶接用電極と前記第2溶接用電極との間に主電流を流すとともに、前記第1溶接用電極と前記補助電極との間に分岐電流を流し、前記分岐電流を請求項1~3のいずれかに記載のスイッチ用電極を有するスイッチで遮断する通電手段と、を備えることを特徴とする抵抗溶接装置。 - 3枚以上の板材を重ね合わせたワークであり、前記板材中、厚みが最小である最薄板材を最外に配置して形成したワークに対して溶接を行うためのスポット溶接装置であって、
前記最薄板材に当接する溶接用電極と、
前記最薄板材に当接し、且つ前記溶接用電極とは逆の極性である補助通電用電極と、
前記溶接用電極及び前記補助通電用電極とともに前記ワークを挟持し、且つ前記溶接用電極とは逆の極性である主通電用電極と、
前記補助通電用電極の状態を検知し、検知した前記状態に応じて前記溶接用電極及び前記補助通電用電極の間を結ぶ電流経路に流れる電流を制御する補助電流制御手段と、
を備えることを特徴とするスポット溶接装置。 - 前記補助電流制御手段は、前記溶接用電極及び前記補助通電用電極の前記最薄板材への当接角度に応じて前記電流経路に流れる電流を制御する、
ことを特徴とする請求項5に記載のスポット溶接装置。 - 前記補助電流制御手段は、前記補助通電用電極に流れる電流の電流値に応じて前記電流経路に流れる電流を制御する、
ことを特徴とする請求項5又は6に記載のスポット溶接装置。 - 3枚以上の板材を重ね合わせたワークであり、前記板材中、厚みが最小である最薄板材を最外に配置して形成したワークに対して溶接を行うためのスポット溶接方法であって、
前記ワークの、前記最薄板材に溶接用電極及び前記溶接用電極とは逆の極性である補助通電用電極を当接させ、前記最薄板材側とは逆側に前記溶接用電極とは逆の極性である主通電用電極を当接させることで前記ワークを挟持する工程と、
前記補助通電用電極の状態を検知し、検知した前記状態に応じて前記溶接用電極及び前記補助通電用電極の間を結ぶ電流経路に流れる電流を制御する工程と、
を有することを特徴とするスポット溶接方法。 - 前記電流を制御する工程は、前記溶接用電極及び前記補助通電用電極の前記最薄板材への当接角度に応じて前記電流経路に流れる電流を制御する、
ことを特徴とする請求項8に記載のスポット溶接方法。 - 前記電流を制御する工程は、前記補助通電用電極に流れる電流の電流値に応じて前記電流経路に流れる電流を制御する、
ことを特徴とする請求項8又は9に記載のスポット溶接方法。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014515569A JP5908976B2 (ja) | 2012-05-18 | 2013-04-30 | スポット溶接装置及びスポット溶接方法 |
US14/401,721 US10399174B2 (en) | 2012-05-18 | 2013-04-30 | Switching electrode and resistance welding device using same, spot welding device and spot welding method |
CN201380025935.9A CN104302434B (zh) | 2012-05-18 | 2013-04-30 | 点焊装置以及点焊方法 |
BR122019001107A BR122019001107B1 (pt) | 2012-05-18 | 2013-04-30 | dispositivo de solda local e método de solda local |
EP13790745.7A EP2851152B1 (en) | 2012-05-18 | 2013-04-30 | Spot welding device and spot welding method |
BR112014028278A BR112014028278A2 (pt) | 2012-05-18 | 2013-04-30 | eletrodo de comutação, dispositivo de solda de resistência, dispositivo de solda local e método de solda local |
CA2873854A CA2873854C (en) | 2012-05-18 | 2013-04-30 | Switching electrode and resistance welding device using same, spot welding device and spot welding method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012114320 | 2012-05-18 | ||
JP2012-114320 | 2012-05-18 | ||
JP2012127808 | 2012-06-05 | ||
JP2012-127808 | 2012-06-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013172202A1 true WO2013172202A1 (ja) | 2013-11-21 |
Family
ID=49583611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/062671 WO2013172202A1 (ja) | 2012-05-18 | 2013-04-30 | スイッチ用電極及びそれを用いた抵抗溶接装置、スポット溶接装置及びスポット溶接方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US10399174B2 (ja) |
EP (1) | EP2851152B1 (ja) |
JP (1) | JP5908976B2 (ja) |
CN (1) | CN104302434B (ja) |
BR (2) | BR112014028278A2 (ja) |
CA (1) | CA2873854C (ja) |
WO (1) | WO2013172202A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10279418B2 (en) | 2014-07-16 | 2019-05-07 | Honda Motor Co., Ltd. | Method and apparatus for resistive spot welding |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101592389B1 (ko) * | 2013-10-14 | 2016-02-05 | 현대자동차주식회사 | 스폿 용접장치 |
DE102014008623A1 (de) * | 2014-06-17 | 2015-12-17 | Thyssenkrupp Ag | Verfahren zum Widerstandspunktschweißen eines Sandwichmaterials und Vorrichtung hierfür |
KR101703597B1 (ko) * | 2015-03-25 | 2017-02-07 | 현대자동차 주식회사 | 전기 직접 가열 방식을 이용하는 블랭크 제조장치 |
US10835986B2 (en) * | 2015-08-27 | 2020-11-17 | Jfe Steel Corporation | Resistance spot welding method and welded member production method |
CN108349039B (zh) * | 2015-10-30 | 2021-08-20 | 日本制铁株式会社 | 具有可动加压构件的点焊电极和使用该点焊电极的点焊方法 |
FI11882U1 (fi) * | 2017-09-15 | 2017-12-05 | Abb Oy | Sähkökytkin |
JP6572281B2 (ja) * | 2017-10-06 | 2019-09-04 | ファナック株式会社 | スポット溶接システム |
US20220072648A1 (en) * | 2020-09-09 | 2022-03-10 | Kth Parts Industries, Inc. | Balanced welding of dissimilar materials |
CN115229496B (zh) * | 2022-06-28 | 2024-01-23 | 建宏金属材料(苏州)有限公司 | 断路器大银点全自动连续焊接设备 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58159986A (ja) * | 1982-03-04 | 1983-09-22 | エルパトローニク・アクチエンゲゼルシヤフト | アルミニウム材料から成る工作物のプレス式抵抗溶接法、ならびに、該法のための装置および電極 |
JPS62156085A (ja) * | 1985-11-14 | 1987-07-11 | アルカン・インタ−ナシヨナル・リミテツド | 溶接電極の有効寿命延長方法 |
JP2009245684A (ja) | 2008-03-31 | 2009-10-22 | Energy Support Corp | 配電機器の電極 |
JP2011194464A (ja) | 2010-03-24 | 2011-10-06 | Fuji Heavy Ind Ltd | スポット溶接方法及びスポット溶接装置 |
JP2012011398A (ja) | 2010-06-29 | 2012-01-19 | Daihatsu Motor Co Ltd | 抵抗溶接方法 |
WO2012033040A1 (ja) * | 2010-09-06 | 2012-03-15 | 本田技研工業株式会社 | 溶接方法及びその装置 |
WO2012043587A1 (ja) * | 2010-09-30 | 2012-04-05 | 本田技研工業株式会社 | 溶接装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2486706A1 (fr) | 1980-07-11 | 1982-01-15 | Thomson Brandt | Interrupteur electrique a rupture de contacts a niveau negligeable de perturbations radioelectriques |
JPS57202988A (en) * | 1981-06-10 | 1982-12-13 | Nippon Abionikusu Kk | Accommodation controlling device for resistance welding |
US5194709A (en) * | 1990-10-08 | 1993-03-16 | Kabushiki Kaisha Sg | Method for checking a spot welded portion and spot welding machine |
JP3396636B2 (ja) * | 1998-10-26 | 2003-04-14 | 松下電器産業株式会社 | 抵抗溶接機の制御方法 |
JP5128159B2 (ja) | 2007-03-30 | 2013-01-23 | 本田技研工業株式会社 | 抵抗溶接方法 |
JP5599553B2 (ja) | 2008-03-31 | 2014-10-01 | Jfeスチール株式会社 | 抵抗スポット溶接方法 |
JP5427074B2 (ja) * | 2009-03-31 | 2014-02-26 | 本田技研工業株式会社 | 抵抗溶接方法及びその装置 |
JP2011152574A (ja) * | 2010-01-28 | 2011-08-11 | Honda Motor Co Ltd | 抵抗溶接方法 |
JP2011200868A (ja) * | 2010-03-24 | 2011-10-13 | Honda Motor Co Ltd | スポット溶接方法 |
-
2013
- 2013-04-30 WO PCT/JP2013/062671 patent/WO2013172202A1/ja active Application Filing
- 2013-04-30 CA CA2873854A patent/CA2873854C/en not_active Expired - Fee Related
- 2013-04-30 JP JP2014515569A patent/JP5908976B2/ja active Active
- 2013-04-30 BR BR112014028278A patent/BR112014028278A2/pt not_active Application Discontinuation
- 2013-04-30 US US14/401,721 patent/US10399174B2/en active Active
- 2013-04-30 CN CN201380025935.9A patent/CN104302434B/zh active Active
- 2013-04-30 EP EP13790745.7A patent/EP2851152B1/en not_active Not-in-force
- 2013-04-30 BR BR122019001107A patent/BR122019001107B1/pt not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58159986A (ja) * | 1982-03-04 | 1983-09-22 | エルパトローニク・アクチエンゲゼルシヤフト | アルミニウム材料から成る工作物のプレス式抵抗溶接法、ならびに、該法のための装置および電極 |
JPS62156085A (ja) * | 1985-11-14 | 1987-07-11 | アルカン・インタ−ナシヨナル・リミテツド | 溶接電極の有効寿命延長方法 |
JP2009245684A (ja) | 2008-03-31 | 2009-10-22 | Energy Support Corp | 配電機器の電極 |
JP2011194464A (ja) | 2010-03-24 | 2011-10-06 | Fuji Heavy Ind Ltd | スポット溶接方法及びスポット溶接装置 |
JP2012011398A (ja) | 2010-06-29 | 2012-01-19 | Daihatsu Motor Co Ltd | 抵抗溶接方法 |
WO2012033040A1 (ja) * | 2010-09-06 | 2012-03-15 | 本田技研工業株式会社 | 溶接方法及びその装置 |
WO2012043587A1 (ja) * | 2010-09-30 | 2012-04-05 | 本田技研工業株式会社 | 溶接装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2851152A4 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10279418B2 (en) | 2014-07-16 | 2019-05-07 | Honda Motor Co., Ltd. | Method and apparatus for resistive spot welding |
Also Published As
Publication number | Publication date |
---|---|
JP5908976B2 (ja) | 2016-04-26 |
CA2873854A1 (en) | 2013-11-21 |
US20150136742A1 (en) | 2015-05-21 |
CA2873854C (en) | 2018-02-06 |
EP2851152A4 (en) | 2016-10-12 |
EP2851152B1 (en) | 2018-04-25 |
JPWO2013172202A1 (ja) | 2016-01-12 |
EP2851152A1 (en) | 2015-03-25 |
CN104302434B (zh) | 2017-05-17 |
CN104302434A (zh) | 2015-01-21 |
US10399174B2 (en) | 2019-09-03 |
BR112014028278A2 (pt) | 2017-06-27 |
BR122019001107B1 (pt) | 2020-01-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5908976B2 (ja) | スポット溶接装置及びスポット溶接方法 | |
JP5427074B2 (ja) | 抵抗溶接方法及びその装置 | |
KR101719172B1 (ko) | 저항 스폿 용접 방법 | |
US9221118B2 (en) | Adaptive control hybrid welding system and methods of controlling | |
JP2011194464A (ja) | スポット溶接方法及びスポット溶接装置 | |
WO2017212916A1 (ja) | 抵抗スポット溶接方法 | |
JP2013071128A (ja) | スポット溶接装置 | |
JP5519457B2 (ja) | スポット溶接方法及びその装置 | |
JP5427746B2 (ja) | スポット溶接装置 | |
KR102127991B1 (ko) | 저항 스폿 용접 방법 및 용접 구조물 | |
CN110997210B (zh) | 电阻点焊方法及焊接构件的制造方法 | |
JP2012071333A (ja) | スポット溶接方法及びその装置 | |
JPWO2016208610A1 (ja) | スポット溶接方法及びその装置 | |
JP5523271B2 (ja) | 間接給電式溶接装置 | |
JP6104013B2 (ja) | スポット溶接方法及びスポット溶接装置 | |
JP2013240810A (ja) | 抵抗溶接装置及び抵抗溶接方法 | |
JP5430530B2 (ja) | スポット溶接装置 | |
JP5864363B2 (ja) | 抵抗溶接装置及び抵抗溶接方法 | |
JP6241580B1 (ja) | 抵抗スポット溶接方法 | |
JP5822904B2 (ja) | スポット溶接方法及びその装置 | |
JP6049512B2 (ja) | スポット溶接方法及びスポット溶接装置 | |
JP2013035045A (ja) | 抵抗溶接方法 | |
CN114286734A (zh) | 电阻点焊方法以及焊接部件的制造方法 | |
JP2014217874A (ja) | 溶接電流値調整装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13790745 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2014515569 Country of ref document: JP Kind code of ref document: A Ref document number: 2873854 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14401721 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013790745 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112014028278 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112014028278 Country of ref document: BR Kind code of ref document: A2 Effective date: 20141113 |