JP3579086B2 - Seam welding equipment - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a seam welding apparatus in which an object to be welded is sandwiched between a pair of disk electrodes and a current is applied under a pressurizing action by the disk electrodes to weld the object to be welded.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a seam welding apparatus has been used to weld a joint portion or the like between workpieces in a continuous linear shape.
[0003]
This seam welding apparatus has a pair of upper and lower disk electrodes for sandwiching an object to be welded, and one of the upper and lower disk electrodes is fixed to the apparatus body, and the other disk electrode is a cylinder or the like. It is provided so as to be displaceable along a substantially vertical direction via a displacement means. In this case, the rotational force of the motor is transmitted to the upper and lower disk electrodes via a member such as a gear or a rack, and one disk electrode is configured on the driving side and the other disk electrode is configured on the driven side. I have. Alternatively, the upper and lower electrodes are driven by displacing the workpiece without driving the disk electrode.
[0004]
Further, in order to perform welding by applying a current to the upper and lower disc electrodes under a pressurizing action on the workpiece, a cooling means for preventing heat generation by the disc electrodes is provided. The cooling means, for example, defines a passage along the axis of the rotation axis of each disk electrode, and cools the disk electrode via cooling water introduced into the passage.
[0005]
[Problems to be solved by the invention]
However, in the seam welding apparatus according to the related art, the outer peripheral surfaces of the upper and lower disk electrodes are worn, so that the diameter of the disk electrodes changes, and the straight lines of the disk electrodes contacting the upper and lower surfaces of the workpiece. Accuracy deteriorates. That is, the upper disk electrode and the lower disk electrode do not correspond to the positions where they come into contact with the upper surface and the lower surface of the work to be welded, respectively. There is a disadvantage that welding cannot be performed.
[0006]
Further, when the disk electrodes are cooled through cooling passages defined along the axis of the rotation axis of each disk electrode, only the area close to the rotation center of the disk electrode is cooled, and There is a disadvantage that the outer peripheral surface of the plate electrode is not cooled so much.
[0007]
The present invention has been made to overcome the above-described disadvantages, and maintains the linear accuracy of the upper and lower disk electrodes even when the diameter of the disk electrode changes, and suitably cools the disk electrode. It is an object of the present invention to provide a seam welding apparatus capable of performing the above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention relates to a seam welding apparatus which sandwiches a work to be welded between electrodes, applies a predetermined pressing force to the work to be welded, and performs welding by applying a current between the electrodes. ,
A rotary drive source,
A pair of disc electrodes,
Driving force transmitting means for transmitting the driving force of the rotary drive source to the pair of disk electrodes and rotating the disk electrodes,
A guide mechanism for maintaining the linearity of the pair of disk electrodes,
A bearing and coupling mechanism that rotatably holds the rotating shaft of each disk electrode and energizes the disk electrode via the rotating shaft;
A cooling mechanism that has a block body that contacts the inner wall surface of the disk electrode, and cools the disk electrode,
Equipped with a,
The bearing / connection mechanism includes a shaft that is a rotation axis of the disk electrode, a connection rod provided on the same axis as the shaft, and a connection that holds the shaft rotatably and fixes the connection rod. It includes a block and a contact member interposed between the shaft and the connecting rod .
[0009]
[Action]
In the above-described seam welding apparatus according to the present invention, for example, the driving force of the rotary drive source is transmitted to the pair of disk electrodes via the driving force transmission means such as a timing belt. In this case, a connecting rod provided on the same axis as the shaft that is the rotation axis of the disk electrode, a connecting block for holding the shaft rotatably and fixing the connecting rod, the shaft and the connecting rod It is welded in a state and a contact member interposed, energized before SL disc electrode through the bearing-coupling mechanism for holding the rotary shaft of the disc electrodes each, pressurized between the Weld things. At this time, the disc electrode is cooled by a cooling mechanism that contacts the inner wall surface of the disc electrode via the elastic force of the spring member.
[0010]
The first and second housings that rotatably hold the respective rotating shafts of the pair of disk electrodes are provided so as to be displaceable in a substantially vertical up and down direction along a linearly extending guide rail. Therefore, even when the diameter of each disk electrode changes due to wear or the like, the linear accuracy of the pair of disk electrodes can be maintained.
[0011]
【Example】
Next, a preferred embodiment of a seam welding apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 1 is a front view of a seam welding apparatus according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional side view of FIG.
[0013]
The seam welding apparatus 10 basically includes a base 12, a driving unit 14 in which a motor (not shown) is built, a pair of upper and lower disk electrodes 16a and 16b, and the pair of disk electrodes 16a. , a support portion 18 for supporting the 16b rotatably, the pair of disc electrodes 16a, 16b and along the arrow _{X 1} or _{X 2} direction to guide the guide portion 20 (the guide mechanism), the rotational force of the motor And timing belts 22a and 22b (driving force transmitting means) for transmitting the driving force to the pair of disk electrodes 16a and 16b.
[0014]
The drive unit 14 has a rectangular parallelepiped casing 24. On one side surface of the casing 24, first and second drive pulleys 26a and 26b meshing with a drive shaft of a motor via gears (not shown) are provided. It is provided rotatably. A first driven pulley 28a is coaxially connected to the upper disk electrode 16a, and a timing belt 22a is suspended between the first driven pulley 28a and the first driving pulley 26a. Further, a second driven pulley 28b is coaxially connected to the lower disk electrode 16b, and a timing belt 22b is suspended between the second driven pulley 28b and the second driving pulley 26b.
[0015]
In this case, gear teeth (not shown) having irregularities are formed on the outer peripheral surfaces of the first and second driving pulleys 26a and 26b and the driven pulleys 28a and 28b, and the timing belts 22a and 22b The rotational movement of the motor can be suitably transmitted to the upper and lower disk electrodes 16a and 16b by meshing with the gear teeth (not shown) formed of irregularities formed on the upper and lower surfaces. In addition, first and second tensioners 30 and 32 are provided near the first and second drive pulleys 26a and 26b, respectively, and the rotating roller 34 that constitutes each of the tensioners 30 and 32 is displaced in the direction of the arrow. The tension of the timing belts 22a and 22b is adjusted by contacting and pressing the timing belts 22a and 22b.
[0016]
A support block 36 having an inverted L-shaped cross section is fixed on the base 12 close to the casing 24. Wherein the bent and the upper 36a formed in the support block 36, a cylinder 42 for displacing the upper disc electrode 16a in the arrow X ₁ or X ₂ direction via the shaft 40 connected to the piston rod 38 is solid Is established. A plate body 44 is connected to a wall surface of the support block 36 that stands in the vertical direction, and the plate body 44 is provided with a pair of guide rails 46a and 46b that are substantially parallel to each other along the arrow X direction.
[0017]
The guide section 20 is provided with first and second rectangular housings 48a and 48b that support the rotating shafts of the respective disk electrodes 16a and 16b, and the first housing 48a is provided with an insulator 50a interposed therebetween. The second housing 48b is fixed to the second plate 54 via an insulator 50b. A pair of linear guides 56a and 56b arranged vertically are fixed to the first plate 52, and a linear guide 56c is fixed to the center of the second plate 54. Thus, the first housing 48a and second housing 48b, respectively linear guide under sliding action of 56 a to 56 c, the guide rail 46a extending in the direction of arrow X, the arrow _{X 1} or _{X 2} along the 46b It is provided so as to be displaceable in the direction.
[0018]
A shaft 40 is connected to an upper portion of the first housing 48a via a fixed block 58, and the shaft 40 is provided with a locking member 62 for locking a spring member 60. The locking member 62 is locked at an arbitrary position in the axial direction of the shaft 40 via a screw member 64, and the elasticity of the spring member 60 is adjusted by the locking member 62, thereby applying a force to the workpiece. The pressure can be kept constant. The fixed block 58 is provided with a scale plate 66 that serves as a measure of the elastic force of the spring member 60 when setting the pressing force on the workpiece.
[0019]
As shown in FIG. 4, a cooling mechanism 70 for cooling the disk electrode 16a is provided on the shaft 68 forming the rotation axis of the disk electrode 16a. Since the cooling mechanism 70 has substantially the same configuration of the upper and lower disk electrodes 16a and 16b, only one disk electrode 16a is described, and the other disk electrode 16b has the same reference numeral. And a detailed description thereof will be omitted.
[0020]
The disk electrode 16a is rotatably supported via a shaft 68, which is a rotating shaft, and the shaft 68 is provided with a stopper 72 functioning as a detent. A driven pulley 28a, a washer 74 and a water-cooling block 76 are sequentially mounted along the axial direction of the shaft 68 between the disk electrode 16a and the first housing 48a, and the water-cooling block 76 has a ring-shaped collar. 78, and further define an annular passage 80 for introducing cooling water. The driven pulley 28a is provided with a screw hole 82 along the radial direction, and the driven pulley 28a is fixed to the shaft 68 via a screw 84 screwed into the screw hole 82. Further, a hole is defined in the driven pulley 28a, and a spring member 86 which is locked by a washer 74 is mounted in the hole, and the water cooling block 76 is circularly moved by the elastic force of the spring member 86. The water cooling block 76 is brought into contact with the disk electrode 16a by pressing the plate electrode 16a. In this case, a pair of locking plates 88a and 88b that hold the outer peripheral surface of the water-cooling block 76 are provided to face each other, and the pair of locking plates 88a and 88b rotate the water-cooling block 76 formed in a ring shape. (See FIG. 1). Therefore, the water-cooling block 76 is pressed against the disk electrode 16a by the resilience of the spring member 86, and is formed so as not to rotate by being held by the pair of opposite locking plates 88a and 88b. Have been.
[0021]
Next, the bearing / connection mechanism 90 of the rotating shaft of the disk electrodes 16a and 16b will be described with reference to FIGS. Since the bearing / connection mechanism 90 is configured substantially identically with the upper and lower disk electrodes 16a and 16b, only one disk electrode 16a will be described, and the other disk electrode 16b will have the same configuration. Reference numerals are given and detailed description thereof is omitted.
[0022]
The shaft 68 forming the rotation axis of the upper disk electrode 16a is held rotatably in the circumferential direction by a pair of bearing members 92a, 92b arranged at a predetermined distance in the first housing 48a. The terminal end of the shaft 68 is connected to a connecting rod 96 via a connecting block 94. The connecting rod 96 is provided on the same axis as the shaft 68, and a lead wire connected to a current supply source (not shown) is connected to one end of the connecting rod 96 exposed from the first housing 48a. The shaft 68, the connecting rod 96, and the contact member 104 are formed of a conductive material so that the shaft 68 and the connecting rod 96 are electrically connected to each other. Is energized.
[0023]
As shown in FIG. 3, the terminal end 98 of the shaft 68 is formed in a substantially hemispherical shape, and is rotatably held in the connection block 94. In the connection block 94, a bearing member 100 made of, for example, a radial bearing is provided. A ring-shaped stopper member 102 is provided on the outer peripheral surface of the shaft 68 close to the bearing member 100, and the stopper member 102 prevents displacement in the axial direction. A contact member 104 having a concave portion corresponding to a hemispherical shape abuts on the terminal end portion 98 of the shaft 68, and the contact member 104 is a conical member engaged by the elastic force of a spring member 106. It is in a state of being pressed toward the terminal end 98 side of the shaft 68 via 108. The spring member 106 is disposed in a hole 110 defined in the connecting rod 96, and the contact member 104 has an inverted tapered shape corresponding to the head of a conical member 108 to which the spring member 106 is engaged. Hole 112 is defined. The cooling liquid is introduced into the connection block 94 via a bent passage 114.
[0024]
Next, the position adjusting mechanism 116 of the lower disk electrode 16b will be described (see FIG. 2).
[0025]
The position adjusting mechanism 116 has a U-shaped holding block 120 that holds the side surface of the second housing 48b via a screw member 118, and is fixed to the side surface of the second housing 48b via a screw member 122. The first and second blocks 124 and 126 are provided and a bolt 128 is inserted between the first and second blocks 124 and 126. An elongated hole (not shown) corresponding to the screw member 118 and extending along the arrow X direction is defined on a side surface of the second housing 48b, and a nut member (not shown) is formed on the screw member 118. Mated. Therefore, the second housing 48b is held by the holding block 120 by tightening the screw member 118, while the second housing 48b is moved in the arrow X direction along the long hole by relaxing the screw member 118. It is displaceably provided.
[0026]
The first block body 124 has a hole 130 penetrating to the head 128a of the bolt 128 and having a diameter smaller than the diameter of the head 128a. Has a screw hole into which the bolt 128 is screwed. Further, a screw hole 132 is formed at the center of the holding block 120 so that a tip of a bolt 128 protruding from the second block body 126 is fitted. Accordingly, by screwing the bolt 128 in a predetermined direction through the hole 130 of the first block body 124 to reduce the amount of screwing of the bolt 128 into the screw hole 132 of the holding block 120, the second housing 48b is turned by the arrow. is displaced in the X ₂ direction, wherein the by increasing the screwing amount of the reverse of the bolt 128, it is possible to displace the second housing 48b in the direction of arrow X _1.
[0027]
Thus, by displacing the second housing 48b in the arrow X ₁ or X ₂ direction, the lower side of the disc electrode 16b which is rotatably supported in the second housing 48b via the shaft 68 it can be displaced along the arrow X ₁ or X ₂ direction.
[0028]
The seam welding apparatus 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effect of the apparatus will be described.
[0029]
First, the screw member 64 that locks the locking member 62 is loosened to tighten the locking member 62 at a predetermined position on the axis of the shaft 40, and the elasticity of the spring member 60 is adjusted so that the workpiece to be welded is adjusted. Is set to a predetermined value. At this time, the setting work can be easily performed by using the scale plate 66 as a guide.
[0030]
Next, the position of the lower disk electrode 16b is adjusted via the position adjustment mechanism 116 in a state where the screw member 118 of the holding block 120 holding the second housing 48b is loosened. That is, as described above, by increasing or decreasing the screwing amount of the bolt 128 with respect to the screw hole 132 of the holding block 120, the second housing 48b is displaced in the arrow _{X 1} or _{X 2} direction, the second housing 48b The position of the held lower disk electrode 16b can be adjusted along the arrow X direction.
[0031]
When adjusting the position of the second housing 48b, the second housing 48b is displaced along a pair of guide rails 46a, 46b extending in a substantially vertical direction via the linear guide 56c. The linear accuracy with respect to one housing 48a is maintained. That is, the linear accuracy of the upper and lower disk electrodes 16a, 16b supported by the first and second housings 48a, 48b, respectively, is maintained. After the position of the lower disk electrode 16b is set in this manner, the second housing 48b is fixed to the holding block 120 by tightening the four screw members 118 screwed to the holding block 120. You.
[0032]
Subsequently, by driving the cylinder 42 under the supply of a pressure fluid from a fluid pressure supply source not shown, to displace the upper disc electrodes 16a on standby in advance upward in the arrow X ₁ direction. In this case, the first housing 48a supporting the disc electrode 16a via the shaft 68 is displaced along a pair of guide rails 46a, 46b extending in a substantially vertical direction via the linear guides 56a, 56b. The linear accuracy with respect to the second housing 48b is maintained. That is, the linear accuracy of the upper and lower disk electrodes 16a, 16b supported by the first and second housings 48a, 48b, respectively, is maintained.
[0033]
After the work of setting the positions of the upper disk electrode 16a and the lower disk electrode 16b corresponding to the workpiece is completed, the motor is driven, and the driving force of the motor is transmitted via the timing belts 22a and 22b. The power is transmitted to the driven pulleys 28a and 28b. Then, a pair of disk electrodes 16a and 16b coaxially connected to the driven pulleys 28a and 28b are rotated. Note that a coolant is supplied from a coolant supply source (not shown) to an annular passage 80 defined in the water cooling block 76.
[0034]
Under the rotating action of the pair of disk electrodes 16a, 16b, a current is supplied to the pair of disk electrodes 16a, 16b via a connecting rod 96 connected to a lead wire to a power source (not shown), and a predetermined predetermined voltage is applied. The welding takes place under the action of pressure. The energization of the pair of disk electrodes 16a and 16b is performed with a predetermined pause.
[0035]
In addition, even if the diameter of the pair of disk electrodes 16a and 16b changes due to wear, the first housing 48a supporting the upper disk electrode 16a and the lower disk electrode 16b are supported. the second housing 48b, because they are formed respectively linearly formed the guide rails 46a, along 46b so as to be displaced in the arrow X ₁ or X ₂ direction, upper disc electrode 16a and the lower the The linear accuracy with the disk electrode 16b is maintained.
[0036]
In addition, by introducing the cooling liquid into the annular passage 80 of the water-cooling block 76 which is pressed by the resilient force of the spring member 86 toward the disk electrodes 16a and 16b and comes into contact with the disk electrodes 16a and 16b, the disk electrode The whole of 16a, 16b is cooled, and the cooling effect can be improved.
[0037]
Further, the shaft 68 rotatably supported by the bearing / connection mechanism 90 is connected to the connection rod 96 fixed to the first and second housings 48a and 48b and connected to the lead wires, and the two are electrically connected. Thus, it is possible to energize the disk electrodes 16a and 16b supported by the shaft 68.
[0038]
【The invention's effect】
According to the seam welding device of the present invention, the following effects can be obtained.
[0039]
That is, even when the diameter of the pair of disk electrodes changes due to wear or the like, the linear accuracy of the disk electrodes can be maintained. Therefore, it is possible to preferably weld the joint portion between the workpieces into a continuous linear shape.
[0040]
Further, since the cooling block can be brought into contact with the inner wall surface of the disk electrode via the elastic force of the spring member, the entire disk electrode can be cooled, and the cooling effect can be increased.
[Brief description of the drawings]
FIG. 1 is a front view of a seam welding apparatus according to an embodiment of the present invention.
FIG. 2 is a partial sectional side view of the seam welding apparatus shown in FIG.
FIG. 3 is a sectional view of a bearing / connection mechanism incorporated in the seam welding apparatus shown in FIG.
FIG. 4 is a sectional view of a cooling mechanism incorporated in the seam welding apparatus shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Seam welding apparatus 12 ... Base part 16a, 16b ... Disc electrode 18 ... Support part 20 ... Guide part 22a, 22b ... Timing belt 26a, 26b ... Drive pulley 28a, 28b ... Driven pulley 30, 32 ... Tensioner 36 ... Support block 42 ... Cylinders 46a, 46b ... Guide rails 48a, 48b ... Housings 56a to 56c ... Linear guide 68 ... Shaft 74 ... Washer 76 ... Water cooling block 78 ... Collar 80 ... Circular passage 90 ... Bearing / connection mechanism

Claims (4)

In a seam welding apparatus that sandwiches an object to be welded between electrodes and applies a predetermined pressure to the object to be welded, and performs welding by energizing between the electrodes,
A rotary drive source,
A pair of disc electrodes,
Driving force transmitting means for transmitting the driving force of the rotary drive source to the pair of disk electrodes and rotating the disk electrodes,
A guide mechanism for maintaining the linearity of the pair of disk electrodes,
A bearing and coupling mechanism that rotatably holds the rotating shaft of each disk electrode and energizes the disk electrode via the rotating shaft;
A cooling mechanism that has a block body that contacts the inner wall surface of the disk electrode, and cools the disk electrode,
Equipped with a,
The bearing / connection mechanism includes a shaft that is a rotation axis of the disk electrode, a connection rod provided on the same axis as the shaft, and a connection that holds the shaft rotatably and fixes the connection rod. A seam welding apparatus comprising: a block; and a contact member interposed between the shaft and the connecting rod . The device of claim 1,
The guide mechanism has first and second housings that rotatably hold respective rotation axes of a pair of disk electrodes, and the first and second housings extend linearly. A seam welding apparatus, which is provided so as to be displaceable in a substantially vertical direction along a guide rail. The device according to claim 1 or 2,
A seam welding apparatus wherein the driving force transmitting means is a timing belt. The device according to any one of claims 1 to 3 ,
The cooling mechanism includes a cooling block that is non-rotatably held by the locking plate, contacts the disk electrode under the resilience of the spring member, and defines an annular passage through which the cooling liquid is introduced. Characterized seam welding equipment.

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