JP2013078773A - Spot welder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spot welder in which even in a welded article having much welding positions in a planar surface part and a longitudinal surface, much welding positions in the longitudinal surface can be welded by a welding gun in a Z direction, and the planar surface part can be welded by another welding gun, with excellent operatability and excellent working efficiency without needing moving and reversing, in the spot welder having welding guns stood on a flat plate-like electrode.SOLUTION: The welding guns (2, 3) stood on the flat plate-like electrode (30) on which the welded article (W) is mounted carries out spot welding in the flat surface part, and welding positions in the longitudinal surface are welded by the Z direction welding gun (31). The Z direction welding gun (31) is constituted of a Z direction gun body part (4), a gun frame part (5), and a gun running part (6) arranged in an end part of the plate-like electrode (30). The movement in a lateral direction is automatic running, the welded article (W) is held by the Z direction gun body part (4), and the spot welding in the longitudinal surface are continuously carried out by pressing and energizing.

Description

  The present invention relates to a spot welder, and more specifically, a welding gun having a horizontal orientation or a vertical orientation that works as an upper electrode on a flat plate electrode, and mainly a large frame-shaped workpiece to be welded. It is related with the spot welding machine which an operator pinch | interposes and welds continuously manually.

  Conventionally, spot welding has been used for joining various metal plates, in which two workpieces are stacked, sandwiched between upper and lower electrodes, pressurized and energized for welding, and there is a wide range of equipment called stationary spot welders. Have been used.

  However, the disadvantage of this equipment is the difficulty in work when welding the workpieces of large structures because the positions of the upper and lower electrodes are fixed. When welding several welding points, it is difficult and difficult to move the work piece, and the electrode is exchanged to avoid interference between the electrode and the work piece. Yes.

  Accordingly, the inventors have invented and proposed a table type spot welder and a welding gun having a flat plate electrode that can easily perform difficult operations. (See Patent Documents 1 to 3)

  A conventional spot welder is shown in FIG. This is a welding machine similar to that of the drawing of Patent Document 2 which was invented and proposed previously. This is a conventional one before the present invention and will be described with reference to FIG.

  As shown in FIG. 7, both or one of the horizontal welding gun (2) and the vertical welding gun (3) standing on the upper part of the lower electrode (30) is mounted. is there. The operator uses the welding gun that works as the upper electrode to continuously weld the spot welding spot on the plane of the workpiece having a large frame shape.

  However, the conventional spot welder of FIG. 7 has the following problems.

  The spot welded portion of the flat part can be worked continuously, but when welding the butt part of the vertical surfaces of the two workpieces that are bent as shown in FIG. However, this is not easy. It is necessary to manufacture and fix a dedicated electrode for the receiving part of the work piece, and it is not easy to hold the work piece, and a large heavy work piece is moved and reversed. In addition, a laborious work is required.

  Therefore, as a method for welding side surfaces, conventionally, there is a method of working by a method of hanging a welding gun called a portable gun. (See Patent Documents 4 to 5)

  The portable guns are roughly classified into a type in which a welding transformer is separated (Patent Document 6) and an integrated type (Patent Document 7), but each has the following problems.

  In the case of the separated type, the welding transformer is installed elsewhere. Therefore, while the portable gun becomes compact, it is necessary to energize the portable gun from the welding transformer via the conductive cable. This conductive cable on the secondary side of the welding transformer is also called a water-cooled cable, which is composed of a thin copper wire, and the cooling water circulates in the cable, so it has a diameter of about 40 mm and is heavy and highly rigid. It has become. Therefore, it is difficult to operate a suspended portable gun. In addition, the copper wire of the cable may be disconnected due to repeated use over time, and the conductive cable is a consumable item.

  In the case of the integral type, since it is constructed integrally with the welding transformer, the portable gun itself becomes large and has a considerable weight. In addition, a primary electric wire to the welding transformer is also required, which makes it difficult to operate the suspended portable gun.

  Therefore, the welding method of the receiving electrode is adopted by welding the above portable gun to the conventional welding machine (Patent Documents 1 to 3) shown in FIG. Even if the reversal work can be reduced, the problem remains that the operation of the suspended portable gun becomes difficult.

Japanese Patent Publication No.7-110423 Japanese Patent Laid-Open No. 2002-224843 Japanese Patent No. 4487178 JP 2010-58153 A JP 09-29448 A Japanese Patent Laid-Open No. 06-142940 Japanese Patent Laid-Open No. 06-190563

  It is an object of the present invention to provide a spot welder that solves the above-described problems and has good operability and efficient work even when there are a large number of welds on the bent vertical surface of a large workpiece. To do.

The present invention solves the above problems by the following configuration.
<Configuration 1>
In a spot welding machine equipped with a plate-like electrode for placing an object to be welded and a welding gun erected above the plate-like electrode,
The Z direction welding gun that welds the vertical surface of the bent shape of the workpiece is
A Z-direction gun body,
A gun frame that supports the Z-direction gun body,
The Z-direction gun body part and the gun traveling part arranged at the end of the plate electrode for laterally moving the gun frame part,
The Z-direction gun main body portion is a thrust in which a welding tip sandwiches and pressurizes the work to be welded by the operation of an air cylinder disposed, and energization from the gun portion conductor applies a through shaft and a lateral pressure of a leaf spring. A spot welder comprising an electrode, a gun tip conductor, and a plurality of insulators, and energizing the welding tip attached to the gun tip conductor.

<Configuration 2>
The gun frame portion is equipped with a plurality of plate-like conductors called bus bars,
Two flexible conductors connected to this plate-like conductor are:
The operation of the air cylinders arranged in each of them makes contact with and away from the conductive pipe of the gun traveling part,
The gun frame portion travels in a state where the flexible conductor and the conductive pipe are separated from each other,
The spot according to Configuration 1, wherein a welding current energized from a welding transformer through a connection copper plate is pressed while being pressed by the operation of the air cylinder and dropped from the conductive pipe onto the flexible conductor. Welding machine.

<Configuration 3>
The gun traveling part is constituted by two conductive pipes through which cooling water circulates, a rack arranged in parallel to the conductive pipes, and a linear motion guide, and a gear attached to a drive motor provided in the gun frame part The Z direction gun body and the gun frame are automatically moved laterally,
2. The spot welder according to Configuration 1, wherein spot welds of the workpiece are continuously formed.

  The present invention is a spot welding machine in which an operator operates a flat plate electrode and a welding gun on the flat electrode, sandwiches an object to be welded with a predetermined welding gun, and welds by applying a current under pressure. The location is such that a welding gun in a horizontal orientation or a welding gun in a vertical orientation is easily moved and turned by a support arm for welding. Furthermore, the welded portion of the vertical surface such as the bent portion of the work piece can be welded continuously by automatically moving the Z-direction welding gun laterally by operating the push button while the work piece is placed. Welding is possible. Also, the Z-direction welding gun can eliminate consumable conductive cables and electrical wiring necessary for portable guns.

It is a front view which shows Example 1 of the spot welder which concerns on this invention. It is a right view of the same Example 1. They are the perspective view (a) of the big to-be-welded object with the spot welding, and sectional drawing (b) of the butt | matching part of two to-be-welded objects. (A) is a perspective view, (b) is an enlarged view of the Z direction gun main body (4) in the right side view of FIG. 2, and (c) is a configuration of energization. (A) AA sectional drawing of (a) shown, (d) is sectional drawing which shows the cooling structure of gun tip conductor (9) and welding tip (8). is there. It is explanatory drawing of the gun frame part (5) of Example 1. FIG. It is explanatory drawing of the gun driving | running | working part (6) of Example 1. FIG. It is a front view which shows the Example of the conventional spot welder (50).

  1 to 6 show an embodiment of a spot welder according to the present invention, in which Z is used for spot welding the vertical surfaces of two workpieces simultaneously with a welding gun (2, 3) in a horizontal orientation or a vertical orientation. This is a spot welder comprising a direction welding gun (31), that is, a Z-direction gun main body (4), a gun frame (5), and a gun traveling part (6).

  The embodiment will be described with reference to the accompanying drawings.

Example 1 of the spot welder (1) of the present invention is shown in FIG. 1 as a front view, and FIG. 2 is a right side view of FIG.
As shown in FIG. 1 and FIG. 2, the spot welder (1) of the present invention places a large workpiece (W) as in the case of FIG. A Z-direction welding gun (31) is provided together with a welding gun (2, 3) erected above the plate electrode (30). The Z-direction welding gun (31) is composed of a Z-direction gun main body (4), a gun frame (5), and a gun traveling part (6). The Z-direction gun main body (4) is the workpiece (W). A large number of spot welds on the vertical surface are continuously welded.

  Specifically, according to the configuration of the welding machine of the present invention, the procedure of the work will be described. First, a large workpiece (W) as shown in FIG. Place on the electrode (30).

  Next, the operator operates the indicated welding gun based on the set process order. When the vertical surface of the workpiece (W) is welded by the Z direction welding gun (31), the Z direction gun body ( 4) is moved to a predetermined welding point on the vertical surface of the workpiece (W). The lateral movement of the Z-direction gun main body (4) is performed by a push button on the operation panel (34) (not shown). The Z-direction gun main body (4) is connected to the gun frame (5), and the rack (20) disposed in the gun traveling part (6) and the gear of the drive motor (15) mounted on the gun frame (5) ( It can be laterally moved to the left and right automatically by the operation of 23). In order to reduce the weight of the Z-direction welding gun (31), a welding transformer is installed on the back of the welding machine, and the current sent via the plurality of plate-like conductors (14) is sent to the thrust electrode (11), gun By using the tip conductor (9) and sending it to the welding tip (8), a thick and highly rigid conductive cable and electrical wiring are eliminated, and automatic lateral movement is facilitated. As shown in FIG. 4 (c), the current-carrying structure of the gun body (4) is a through shaft (26), and a thin cylindrical thrust electrode (11), gun tip conductor (9), etc. are integrated into a resin washer. The two poles are separated by an insulator (24, 25) and the like, and a lateral pressure is applied by a leaf spring (13), thereby improving the conductivity from the gun part conductor (10). In the embodiment of FIG. 4 (c), the thrust electrode (11) is composed of four pieces, and is fixed to the side surfaces of the gun tip conductor (9) and the gun section conductor (10) with a flat head screw. In addition, the slidability of rotation is improved, and pressurization and energization in gripping the workpiece (W) by opening and closing the welding tip (8) are ensured.

  In spot welding on the vertical surface, the operator determines the left and right positions of the Z-direction gun body (4) by operating a push button, and when the welding switch is turned on, the air cylinder ( 12) is actuated, and when the work piece (W) is sandwiched and pressed by the welding tip (8) of the Z-direction gun main body (4), the current of the welding conditions registered in the control unit is dropped, Welding is completed at one point.

The current path to the work piece (W) consists of two conductive pipes (22) connected to respective electrodes of a welding transformer (33) arranged on the back of the welding machine via connection copper plates (17, 18). 5 through a flexible conductor (19) called an ounce copper plate as shown in FIG. 5, through several plate-like conductors (14), a thrust electrode (11), etc., a gun tip conductor (9) The flow spot welding is performed to the workpiece (W) held between the pair of welding tips (8) attached to. The welding tip (8) is usually used to prevent heat generation during welding by circulating the cooling water, but here as well, as shown in FIG. 4 (d), the welding tip (8) is interposed via the gun tip conductor (9). Cooling water is sent to to prevent heat generation. Further, the energization here eliminates a thick and highly rigid conductive cable and electric wiring, and therefore, it is easy to move sideways automatically. Furthermore, the air cylinders (16) are mounted on the two flexible conductors (19), which are in contact with and separated from the conductive pipe (16) of the gun traveling part (6), as shown in FIG. 5 (b). The flexible conductor (19) and the conductive pipe (22) are separated from each other with a gap H, and are configured to come into contact with a pressure applied by the air cylinder (16) when the welding current is dropped. Yes. In the first embodiment, as shown in FIGS. 2 and 6, a linear motion guide (21) is used for the movement in the left-right direction so that the lateral movement can be performed smoothly.
Next, the operator operates the push button again, repeats the above-described operation, and continuously performs the spot welding of the vertical surface.
In the first embodiment, it is possible to automatically move left and right by operating the drive motor (15) by operating the push button on the operation panel (34). However, it is possible to completely automate lateral movement by numerical control by transmission from the control unit. Conversely, the drive motor is eliminated and the operator can manually move the Z-direction gun body (4) laterally.
Further, spot welding of the flat portion is the same as in the prior art, and the operator operates any one of the welding guns (2, 3) to continuously perform spot welding.

With respect to the various shapes of the work piece (W), especially in the shape where the side surface perpendicular to the vertical surface to be welded is bent, insertion of the vertical surface to be welded to the gun main body (4), that is, the setting property It is considered that there are many problems that cannot be dealt with only by the above-described contents of the present invention.
Therefore, although not shown, if the following countermeasures are taken, it is possible to deal with various shapes of the workpiece (W) and the problem is solved.

In the case where the side surface of the work piece (W) is not bent as in the example of FIG. 3, the Z-direction gun body (4) is simply moved laterally, and the vertical surface to be spot welded is the Z-direction gun body ( There is no problem because it is sandwiched between the two welding tips (8) of 4). However, if the Z-direction gun main body (4) is outside the side bend in a shape with side bends, lateral movement inward is difficult and cannot be inserted. Therefore, as a countermeasure, if any one of a mechanism for raising and lowering the gun body (4) or a mechanism for raising and lowering the plate electrode (30) is adopted, the side of the workpiece (W) is bent. The gun body (4) can be moved laterally without avoiding and interfering, and the problem of insertion is solved. The present inventors have previously proposed a mechanism in which the plate-like electrode (30) moves up and down in Patent Document 3.
In addition, when a large number of vertical surface positions to be spot welded in various shapes of the workpiece (W) are generated in the front-rear direction, the position of the vertical surface to be spot welded with the gun body (4) is not variable. It is not possible to cope with fixing only the place. Therefore, as a countermeasure, a gun frame part (5) having the gun body part (4) coupled to the tip has a mechanism for moving back and forth, or a plate electrode (30) has a mechanism for sliding back and forth. Or, again, if either method is adopted, the problem is solved.
Furthermore, according to the size or shape of the product, that is, the work piece (W), the above countermeasures may be selected to set the specifications of the apparatus. Then, if the countermeasure is added to the present invention, a spot welder that can cope with various shapes of workpieces (W) is completed.

  Spot welding is performed mainly on a workpiece with a large frame shape by sandwiching the workpiece with a welding gun in a horizontal orientation or a welding gun in a vertical orientation, but without moving or reversing the workpiece. With this welding gun, spot welding can be performed continuously on the vertical surface, and it can be used as a welding machine that is gentle to workers who do not require heavy work such as reversing movement of the workpiece. Furthermore, the welding gun in the Z direction can eliminate conductive cables and electrical wiring that are consumables necessary for the portable gun.

DESCRIPTION OF SYMBOLS 1 Spot welder 2 Welding gun of horizontal attitude 3 Welding gun of vertical attitude 4 Z direction gun main-body part 5 Gun frame part 6 Gun traveling part 7 Cooling water passage 8 Welding tip 9 Gun tip conductor 10 Gun part conductor 11 Thrust Electrode 12 Air cylinder 14 Plate-shaped conductor 15 Drive motor 16 Air cylinder 17 Connection copper plate 18 Connection copper plate 19 Flexible conductor (ounce copper plate)
20 rack 21 linear motion guide 22 conductive pipe 23 gear
24 Insulator 25 Insulator 26 Through Shaft 27 Support Arm 28 Conductive Cable 30 Plate Electrode 31 Z Direction Welding Gun 33 Welding Transformer 34 Operation Panel 40 Support Post 50 Conventional Spot Welder H Gap W Workpiece

Claims (3)

In a spot welding machine equipped with a plate-like electrode for placing an object to be welded and a welding gun erected above the plate-like electrode,
The Z direction welding gun that welds the vertical surface of the bent shape of the workpiece is
A Z-direction gun body,
A gun frame that supports the Z-direction gun body,
The Z-direction gun body part and the gun traveling part arranged at the end of the plate electrode for laterally moving the gun frame part,
The Z-direction gun main body portion is a thrust in which a welding tip sandwiches and pressurizes the work to be welded by the operation of an air cylinder disposed, and energization from the gun portion conductor applies a through shaft and a lateral pressure of a leaf spring. A spot welder comprising an electrode, a gun tip conductor, and a plurality of insulators, and energizing the welding tip attached to the gun tip conductor. The gun frame portion is equipped with a plurality of plate-like conductors,
Two flexible conductors connected to this plate-like conductor are:
The operation of the air cylinders arranged in each of them makes contact with and away from the conductive pipe of the gun traveling part,
The gun frame portion travels in a state where the flexible conductor and the conductive pipe are separated from each other,
The welding current energized from the welding transformer through the connection copper plate is brought into contact while being pressurized by the operation of the air cylinder, and dropped from the conductive pipe onto the flexible conductor. Spot welder. The gun traveling part is composed of two conductive pipes through which cooling water circulates, a rack arranged in parallel to the conductive pipes, and a linear motion guide, and a gear of a drive motor provided in the gun frame part. The Z-direction gun body and the gun frame are automatically moved laterally,
The spot welder according to claim 1, wherein spot welding of the workpiece is continuously performed.