JP3922917B2 - Resistance welding machine - Google Patents

Description

[0001]
[Industrial application fields]
  The present invention relates to a resistance welding machine, and more specifically, not limited to a metal material such as a steel plate, but inside a structure such as a metal box or a metal frame assembled with a steel plate.Even so, it can be welded without moving the structure, producing the downward pressure required for this weldingSuch as piston / cylinder mechanism and motorPressurization mechanismUpwardThere is no need to install, and there is no need for heavy-duty heavy-duty wiring.Related to resistance welding machines.
[0002]
[Prior art]
  In general, in metal working, especially sheet metal working, a resistance welding machine that heats up the resistance heat generated by this metal plate and other metal materials such as metal plates to be welded, and at the same time applies pressure and resistance welding Is used to make metal structures such as boxes and frames. like thisFor sheet metal processingThe welding machine used isOut of resistance weldersIt is called a spot welderthingIt is.
[0003]
  A variety of spot welders are used depending on the application, from large ones used for manufacturing automobile bodies to small ones used for sheet metal processing, etc., but most of them are stationary.What is saidIt is. Among these, technical improvements are being developed as dedicated machines in the field of automobile body manufacturing, etc., and the field of spot welders applied to the field of various types of small rod workpieces.Then,ThatThere is almost no technical improvement.
[0004]
  The welding principle is almost the same in spot welding machines in any field, and two metal materials are overlapped, sandwiched between a pair of upper and lower electrodes, and welded by applying downward pressure to the upper electrode. . Therefore, the structure of the welder is lowered from above and welded by applying pressure to the two metal materials.TopIt is provided facing the electrode and receives pressure from above.beneathConsisting of electrodesHave.The upper part in such a welderElectrodeaboveA pressurizing mechanism is arranged, and this pressurizing mechanismPartThe electrode is pushed downward and the workpieceIsDownward pressureButAddedWeldedIt is configured as follows.
[0005]
  Also,Spot welders are often incorporated as part of production lines for automobile bodies and the like. thisIf, The individual processes of the car body and the corresponding equipment are incorporated throughout the line,Car bodyWhen a workpiece such as a material flows to the spot welder, welding is performed.TheThe car body is assembled.
[0006]
  On the other hand, in the field of sheet metal processing for assembling and processing small rod frames and boxes, it may be necessary to weld the welds inside the workpiece, in which case it is not possible to press directly from the outside of the workpiece. . In such a workpiece, it is difficult to form a line because the metal plates are welded each time they are assembled. In other words, such a workpiece is welded by being conveyed to the welding machine whenever necessary.
[0007]
  That is, only the type of welding machine that is welded by lowering the upper electrode downward from the upper side is proposed even in the case of internal welds that are common in workpieces with complicated structures. There remains an internal weld that cannot be welded by the welding machine after pressurization. In this case, use a jig with a special structure according to the position and shape of the internal weld, and weld it from the outside as much as possible. Like to do.
[0008]
  However, when welding is performed in this way, welding flaws and the like remain on the outer welded part, and the work to remove this is counted as one of the important tasks in sheet metal processing. It is desired.
[0009]
  In view of this, the present inventors have previously proposed a resistance welding machine that can select a welding posture according to the position and shape of the internal welded portion even for a workpiece having a complicated shape with a small rod. With this resistance welding machine, even when welding is required during work, assembly, etc., the welding posture can be widely selected according to the work, and work such as work and assembly can be achieved. (See Japanese Patent Application No. 2001-022342)
[0010]
  With this resistance welderTop and bottomThe electrode is like a spot weldertipDo not have a point-like rod shape,PartThe electrode is made of a flat conductive plate material.thisBecause of this plate shapeelectrodeMetal materials can be processed and assembled on top of theelectrodeWherever the workpiece is placed, welding can be performed by simply lowering the upper electrode downward with respect to the workpiece.
[0011]
  The resistance welding machine with this structurePartThe electrode is a plate-like work surface, and the entire area is energized to function as an electrode.likeMetal materials and workpiecesEvenweldingit can.
[0012]
  However, in this resistance welding machine, in order to apply a downward pressure by the upper electrode, a pressure mechanism such as a piston / cylinder mechanism that applies the downward pressure is inevitably provided on the upper electrode. A support member for holding the pressurizing mechanism and the like at the top is required. For this reason, in order to hold | maintain an upper electrode and this pressurization mechanism, a member itself enlarges, and this point is said to be the biggest fault.
[0013]
[Problems to be solved by the invention]
  The present invention solves the above disadvantages, and is a welding machine having a structure in which the lower electrode can be used as a work surface.PartDownward pressure applied by electrodeIsWe propose a welding machine that can be extracted from a power source such as a piston / cylinder mechanism provided below and has a compact structure.
[0014]
[Means for Solving the Problems]
  That is, the resistance welding machine according to the present invention is supported by a support member 140 so as to be pivotable in a lateral posture, and a welding gun 130 having a tip welding tip 131 serving as an upper electrode;Connected to one pole 111 of the welding power source 110A resistance welding machine 100 comprising a plate-like electrode 120 that acts as a lower electrode anywhere on the surface, and a pressure member 150 that pushes the rear end of the welding gun 130 upward and pivots the tip welding tip 131 downward. In order that the welding gun 130 can move together with the support member 140 and the pressure member 150 at a planar level,140The support base 142 is provided with a cylindrical member 143 for accommodating the pressurizing member 150 so as to be movable up and down, and the support base 142 is configured to be rotatable on the outer periphery of the cylindrical member 143. Between the rear end of the welding gun 130 and the pressure member 150A current plate 170 connected to the other pole 112 of the welding power source 110 is provided at a distance from the rear end of the welding gun 130.,The current-carrying plate 170 is pushed up by the pressure member 150 and is brought into contact with the rear end portion of the welding gun 130 to be energized.It is characterized by.
[0015]
  Therefore, the configuration and operation of these means will be specifically described with reference to the drawings as follows.
[0016]
  FIG. 1 is a front view of a resistance welder according to one embodiment of the present invention.
[0017]
  FIG. 2 is an explanatory diagram viewed from the front of one embodiment when a workpiece is welded by the resistance welding machine shown in FIG.
[0018]
  FIG. 3 is an explanatory view seen from the front of one embodiment when pressurizing and welding with the resistance welding machine shown in FIG.
[0019]
  FIG. 4 is an explanatory view showing a part of the cross-sectional structure of the energizing plate shown in FIG.
[0020]
  First, in FIG. 1, reference numeral 100 generally indicates a resistance welder according to one embodiment of the present invention. 1, 2, and 3, reference numeral 110 is a welding power source, 120 is a plate electrode, 130 is a welding gun, 131 is a welding tip, 140 is a support member, 141 is a pivot shaft, 150 is a pressure member, Reference numeral 170 denotes an energization plate for turning on / off the welding current.
[0021]
  When the workpiece W is welded by the resistance welding machine 100 shown in FIG. 1, the workpiece W is placed on the plate electrode 120. A desired pressure is applied downward to the workpiece W by the welding tip 131, and a desired welded portion (not shown) is resistance-welded.
[0022]
  The workpiece W may be a plate-shaped material as shown in FIG. 1 or a structure such as a metal box or a frame in which the plate-shaped material is assembled. can do.
[0023]
  When making a metal box or the like, it is not necessary to assemble off-line, and processing and assembly can be performed on the plate electrode 120 of the resistance welding machine 100, and welding can be performed when necessary.
[0024]
  Therefore, the plate-like electrode 120 is made of a conductive plate-like material that is flat and as wide as possible, and one pole 111 of the welding power source 110 is connected to it. For this reason, the surface of the plate electrode 120 can serve as a work table or work surface.
[0025]
  For this reason, it is configured to be flat, so that any part of the surface functions as one electrode, and most of the entire surface including at least the central part is made of copper, aluminum, their alloys, or other conductive electrode metals. However, the plate-like electrode itself is also constructed so as to ensure a sufficient structural strength so as to withstand pressurization during welding.
[0026]
  In addition, one electrode 111 and the other electrode 112 are taken out from the welding power source 110. The other electrode 112 energizes the welding gun 130 via the energizing plate 170 as described later, and turns on / off energization of the welding current to the welding tip 131 at the tip.
[0027]
These two electrodes 111 and 112 are shown as plate-like support pieces in FIG. 1, and the energization path connected to them is shown as a line segment, but in FIGS. 2 and 3, only the energization path is shown for convenience of explanation. Is shown as a line segment. In any case, these are generally indicated by conductive cables and the like, and indicate the same thing.
[0028]
  Further, even in the resistance welding machine according to the present invention used for processing a steel sheet such as so-called sheet metal processing, the workpiece W is placed between the upper and lower electrodes in the same manner as the energized spot welding machine and the seam welding machine. Although a stone-like welded portion (nugget) is formed and welded, the upper and lower two electrodes are not configured as spot-like spot electrodes, unlike the conventional example.
[0029]
  That is, the resistance welding machine 100 configures one electrode corresponding to the lower of the upper and lower electrodes as the plate electrode 120. This type of welding machine is a type of welding machine proposed by the present inventors.
[0030]
  For this reason, the surface of the plate-like electrode 120 is energized over the entire surface, and can be used as one of the electrodes where the workpiece W is placed, and when pressure is applied from the welding tip 131 corresponding to the upper electrode. In the meantime, the workpiece W can be pinched and resistance-welded, and the amount of current during welding can be increased without necessarily forming the lower electrode as a spot electrode as in the conventional example.
[0031]
  The other electrode 112 of the welding power source 110 is connected via an energizing plate 170, and as will be described later, the energizing plate 170 is brought into contact with the welding tip 131 at the tip of the welding gun 130 only at the time of pressurization by contacting the energizing plate 170 at the time of pressure welding. Energize. That is, at the same time that a downward pressing force is applied to the welding tip 131, only when this pressing force is applied, a welding current is applied to reduce the amount of power and only when the pressing force is applied. Energizes effectively.
[0032]
  The welding tip 131 is detachably held at the tip of the welding gun 130, and the welding gun 130 is held in a lateral position on the plate-like electrode 120 forming the lower electrode.
[0033]
  Welding gun 130From the endTo welding tip 131Welding currentCurrent pathProvideIn addition, in addition to providing a cooling water supply path that enters from the inlet 133 and is discharged from the outlet 134, as will be described later, it constitutes a part of the pressurizing mechanism to the welding tip 131 at the time of welding. There is a kind of thingWorkingThe welding pressure is transmitted to the welding tip 131. For this purpose, the welding gun 130 is configured in the shape of a rod as described above, and the rod-shaped welding gun 130 is placed in a horizontal posture.The welding gun 130 is supported by the support member 140 through the pivot shaft 141 so as to be rotatable..
[0034]
At the rear end portion of the welding gun 130, an energizing plate 170 is connected to the other pole 112 of the welding power source 110, and an intervening energizing plate 170 is inserted as described later in order to energize the welding tip 131 at the front end. 4 is configured so that energization from the welding power source 110 is turned on / off in synchronization with the pressurization by the pressurizing member 150.
[0035]
  When configured in this way, it is important that the welding gun 130 is first held in a lateral orientation. With this posture, the direction of the force pushed upward by the pressure member 150 to be moved later can be changed and transmitted to the welding tip 131 as a pressing force, and the rear end portion of the welding gun 130 to which the pressing force acts is the workpiece W. Therefore, welding can be performed even if the welding gun 130 is moved freely on the plate-like electrode 120 in the horizontal orientation.
[0036]
  The welding gun 130 can move in the front-rear direction with respect to the workpiece W (in FIG. 1, the left-right direction along the plane of the paper) while maintaining the horizontal posture.
[0037]
  This moving mechanism can be configured in any way, and in particular, the welding gun 130 is configured to be movable at a plane level together with the support member 140 and the pressure member 150 to be described later, for example, the x and y axes on the plane are determined. It can also be configured to move by computer or numerical control.
[0038]
  For example, when the welding gun 130 is moved to the left along the paper surface of FIG. 1, if it is flattened, the welding tip 131 at the tip part will penetrate into the inside of a structure such as a metal box or a frame. Even in the workpiece W having a structure in which the vertical direction corresponding to the vertical movement path of the upper and lower electrodes of the conventional spot welder is closed, the welded portion inside can be welded without any trouble.
[0039]
  A pivot shaft 141 is provided at one fixed point between the front end portion and the rear end portion of the welding gun 130 held in the horizontal orientation. The pivot shaft 141 is supported by a support member 140, and the welding gun 130 is configured to be pivotable with the support member 140 as a fulcrum. With this configuration, even if an upward force is applied upward to the rear end portion of the welding gun 130, the upward force can be transmitted to the welding tip 131 at the tip portion in a changed direction as a downward pressing force. The position of the pivot shaft 141 can be configured to be adjusted as desired.
[0040]
  If comprised in this way, the upward force which acts on a rear-end part can be made to act on the welding tip 131 as a big pressurizing force. That is, the force applied to the rear end portion of the welding gun 130 is applied to the work tip W as a downward pressing force by changing the direction of application to the welding tip 131 at the leading end portion, and the applied pressing force is the pivot shaft 141. Can be increased by adjusting the position of the welding gun 130 or adjusting the length of the welding gun 130.
[0041]
  That is, the welding gun 130 that is held in a horizontal posture on the plate-like electrode 120 has a rod shape. A welding tip 131 is attached to the front end portion, and a pivot shaft 141 is provided through one fixed point between the front end portion and the rear end portion. The rear end portion is configured to be pushed upward by the pressure member 150. Therefore, the welding gun 130 is pivotally supported by the pivot shaft 141.ButWith fulcrumAround thatSwirl,At the endPressure member 150 is the prime moverWhile the push-up force that pushes upwards acts, Welding tip 131It becomes a follower accompanying the push-up and applies pressure to the welding point of the workpiece WWorkLendAs a lever mechanism, the effects as described above can be achieved.
[0042]
  The pivot shaft 141 that pivotably supports the welding gun 130 in the horizontal posture can be supported by any structure, and the pivot shaft 141 is supported by the bearing member 140. The support member 140 is disposed on the support table 142, and the support table 142 itself is configured to be able to turn on a plane substantially parallel to the plate electrode 120.
[0043]
  In other words, for example, at the time of welding, the welding tip 131 is configured to be able to freely turn on a parallel surface (a surface parallel to the plate electrode 120) perpendicular to the paper surface in FIG. If comprised in this way, as mentioned above, the welding tip 131 of a front-end | tip part will be sufficient only by operating the rear-end part of the welding gun 130 wherever there exists a welding part inside workpieces, such as a metal box and a frame. Can be freely manipulated.
[0044]
  When configured as described above, first, the welding gun 130 held in the horizontal posture is configured to rotate with the pivot shaft 141 as a fulcrum.CompletionHas been.For this reasonThe welding gun 130 functions as an upper electrode together with the welding tip 131 at the tip, and also performs an extraordinary function. For this reason, when a pushing force is applied upward from the lower side to the rear end portion of the welding gun 130, the force changes its direction and acts as a downward force on the welding tip 131 at the front end portion. For this reason, there is a welded portion inside the metal box, and a downward pressing force is applied to the welding tip 131. Further, if the support member 140 that supports the pivot shaft 141 that forms a pivot point is configured to be able to turn on a plane parallel to the plate electrode 120, the welding gun 130 can also be moved back and forth on the parallel plane. It can swivel freely and the inside of a workpiece such as a metal box can be welded anywhere.
[0045]
  When the support member 140 is configured to be pivotable, the support member 140 isSupport stand142 and support thisSupport standIt is also possible to provide a cylindrical member 143 on 142 so that the outer periphery of the cylindrical member 143 can be rotatably supported by a bearing 144. Further, the pressure member 150 can be accommodated in the cylindrical member 143 so that it can be raised and lowered.
[0046]
  In short, even if the welded portion is inside the metal box, the welding tip 131 can be positioned at the position of the welded portion only by operating the rear end portion of the welding gun 130.
[0047]
In addition, the pressurizing member 150 that applies an upward force to the welding gun 130 can be configured in any way, but as shown in FIG. The rear end portion of the welding gun 130 is composed of a pressurizing member 150 for applying pressure upward from the lower side and an elevating means for moving the pressurizing member 150 up and down. A current-carrying plate 170 is interposed between the end portion and the current flowing based on a predetermined voltage applied by the welding power source 110 is turned on / off.
[0048]
  That is, the raising / lowering means of the pressurizing member 150 is usually composed of a piston / cylinder mechanism 151, and when the pressurization member 150 is raised by the piston / cylinder mechanism 151, the energizing plate 170 is pressed against the rear end portion of the welding gun 130. Configure as follows. When the energizing plate 170 is pressed, the rear end portion of the welding gun 130 is pushed upward to rotate about the pivot shaft 141 as a fulcrum and in the counterclockwise direction, and the welding tip 131 is rotated with this rotation. However, the welding tip 131 is lowered downward to pressurize the workpiece W, and the workpiece W is welded while being energized only during this pressurization.
[0049]
  The pressure member 150 is usually the piston / cylinder mechanism 151.As some piston rodEven if the structure is other than a piston / cylinder mechanism, any structure can be used as long as it can apply a lifting force to the pressure member 150. For example, a direct current motor, Step motor, etc.As a drive source for liftingCan be used.
[0050]
Further, the rear end portion of the welding gun 130 is pushed upward by the pressure member 150 in this way, and the upward force is changed to apply a downward pressing force to the welding tip 131 at the tip portion. When the current is turned on / off in conjunction with the current-carrying plate 170, the piston / cylinder mechanism 151 that pushes up the pressure member 150 is on a base (not shown) such as the floor or the ground, for example, the base shown in FIG. It can be arranged even if it is fixed to the frame 152, and there is no need for a support frame or a support device for supporting the piston / cylinder mechanism above the plate electrode 120. There is no need to connect them.
[0051]
More specifically, when a downward pressing force is applied to the workpiece W placed on the plate electrode 120 from above by the welding tip 131, a piston / cylinder mechanism is provided above, and the upper piston / cylinder mechanism is used. It is customary to apply downward pressure. Rather, it is not unreasonable that the structure in which the downward pressure is applied by the upper piston / cylinder mechanism is mechanically or from the viewpoint of transmission of the pressure.
[0052]
However, when the structure disposed above is applied, as described above, in the welding machine in which the lower electrode is configured as the plate-like electrode 120, the piston / cylinder of the driving source whose pressurizing force affects the weldability A drive source such as a mechanism becomes larger, and a strong support frame is required accordingly, and the welder itself becomes larger and heavy.
[0053]
When the lower electrode is composed of a plate-like electrode 120 made of a flat plate-like material, a larger installation space is required as compared with the stationary spot welding machine of the conventional example. Further, the pressure applied to the welding tip 131 by the piston / cylinder mechanism needs to be larger than that of a normal spot welder, and the piston / cylinder mechanism becomes larger and heavier. With this increase in size and weight, the support frame that holds the piston / cylinder mechanism upward must inevitably be large and strong.
[0054]
  Specifically, the support mechanism is constructed by setting up a support frame or support column of the piston / cylinder mechanism around the plate electrode 120 that takes space, and a high pressure is applied to this framework during welding. It is done. However, if the supporting mechanism is increased in size as described above, the welding machine itself is also increased in size, which is not preferable.
[0055]
On the other hand, as in the welding machine 100 shown in FIG. 1, when the structure is such that the welding gun 130 itself is used and the rear end portion is pushed upward to pressurize, the piston / cylinder mechanism 151 is downward, especially Although there is an advantage that it can be attached to the base such as the ground or the base frame 152 disposed on the base, the welding gun 130 itself rotates around the pivot shaft 141, so that the welding gun 130 in a lateral orientation is used. Connecting an energizing cable or the like to the rear end of the cable is not preferable in terms of structure and function because the energizing cable itself is touched for each spot welding. Further, in order to remove the obstacle caused by the energized cable, a separate complicated removal facility is required.
[0056]
Further, as described above, when the rear end portion of the welding gun 130 is pushed upward by the pressurizing member 150 and the welding tip 131 comes into contact with the surface of the workpiece W, the pressing force is applied and at the same time the contact of the energizing plate 170 2 and 3, a contact surface 132 is provided on the lower surface of the welding gun 130, and the top end of the pressure member 130 is brought into contact with the contact surface 132. At this time, it is preferable that the top end of the pressure member 130 is pushed up and formed into a spherical shape as shown in FIG.
[0057]
The contact surface 132 is not horizontal but is configured as an inclined surface inclined upward at an inclination angle θ 2 toward the tip of the welding gun 130. When the contact surface 132 is configured as an inclined surface in this manner, a uniform applied pressure can be applied when the workpiece W is contacted, the resistance when the current-carrying plate 170 contacts the contact surface 132 can be reduced, and welding is performed. Can be improved.
[0058]
When no pressure is applied to the workpiece W during welding, as shown in FIG. 2, the welding gun 130 is almost parallel and the energizing plate 170 is separated from the contact surface 132. At this time, the welding tip 131 is separated from the workpiece W, the contact surface 132 of the rear end portion of the welding gun 130 is separated from the contact surface 132 without pushing up the pressurizing member 150, and the energizing plate 170 is also separated. ing. When the pressurizing member 150 is raised in this state, the current-carrying plate 170 is also pushed upward, the tip of the welding tip 131 is lowered downward, contacts the surface of the workpiece W, and the state shown in FIG. Then, the workpiece W is pressurized and the energizing plate 170 is brought into contact with the contact surface 132 and energized.
[0059]
When the state shown in FIG. 3 is entered, the contact surface 132 also has an inclination angle θ.₂The welding gun 130 rotates about the pivot shaft 141 of the fulcrum, and the tip is inclined θ₁Only tilt, tilt angle θ₂Only by the rotation, the pressing member 150 comes into contact with the contact surface 132 in a state of being substantially orthogonal to the axis (that is, in a parallel state), and the upward force is in a state parallel to the contact surface 132. The pressure member 150 contacts the contact surface 132 on average, and the contact resistance during this time is minimized.
[0060]
When the support member 140 on which the pivot shaft 141 is supported is configured to be rotatable via the support table 142, the pressure member 150 is incorporated into the support table 142, so that a compact configuration can be achieved. In this case, the pressing member 150 penetrates the support base 142 and rotatably supports the cylindrical member 143 that supports the support base 142 via the bearing 144.
[0061]
  With this configuration, the pressure member 150 is moved up and down by the piston / cylinder mechanism 151, while the support base 142 can freely rotate around the pressure member 150, and the welding gun 130 supported via the support member 140. Can swivel freely on a plane level.
[0062]
  In addition, as described above, it is sufficient that the current plate 170 for turning on and off the welding current is configured as a contact terminal. However, as shown in FIG. It can comprise so that it can isolate | separate.
[0063]
  In FIG. 4, reference numeral 132 denotes a contact surface of the previously-mentioned welding gun 130, where a rod-shaped material 171 is provided, and the lower end thereof is enlarged in diameter to form a flange portion 172. The energizing plate 170 includes a conductor 173 and a support plate 174, and one pole 112 of the welding power source 110 is connected to the conductor 173, and further, a blind hole 175 is formed, and a rod-like shape is formed in the blind hole 175. A material 171 and a flange portion 172 are accommodated.
[0064]
  When not pushed upward from the lower side, there is a slight gap G between the conductor 173 and the contact surface 132 as shown in FIG. On the other hand, when it is pushed upward by the pressure member 150, it rises by the gap G, and the contact surface 132 and the conductor 173 come into contact with each other to energize.
[0065]
  With this configuration, the welding current can be turned on / off by moving only the gap G of the conductor 173, and the moving stroke is extremely small. Therefore, the conductive cable from one pole 112 is turned on with little movement.・ Can be turned off. At the same time, by adjusting the gap G, the energization can be performed with a slight time difference from the start of pressurization of the workpiece W, and the energization at the time of welding can be performed in conformity with the properties of the workpiece W.
[0066]
【The invention's effect】
  As described above, the present invention includes a welding gun 130 that is supported in a swingable manner by the support member 140 in a sideways posture and the welding tip 131 at the tip serves as an upper electrode.Connected to one pole 111 of the welding power source 110A resistance welding machine 100 comprising a plate-like electrode 120 that acts as a lower electrode anywhere on the surface, and a pressure member 150 that pushes the rear end of the welding gun 130 upward and pivots the tip welding tip 131 downward. In order that the welding gun 130 can move together with the support member 140 and the pressure member 150 at a planar level,140The support base 142 is provided with a cylindrical member 143 for accommodating the pressurizing member 150 so as to be movable up and down, and the support base 142 is configured to be rotatable on the outer periphery of the cylindrical member 143. Between the rear end of the welding gun 130 and the pressure member 150A current plate 170 connected to the other pole 112 of the welding power source 110 is provided at a distance from the rear end of the welding gun 130.,The current-carrying plate 170 is pushed up by the pressure member 150 and is brought into contact with the rear end portion of the welding gun 130 to be energized.It is characterized by.
[0067]
  Therefore, the resistance welding machine according to the present invention is not limited to a metal material such as a steel plate, and even a structure such as a metal box or a metal frame in which a steel plate is assembled is welded at a desired place inside. it can.
[0068]
In addition, a pressurizing mechanism such as a piston / cylinder mechanism or motor that applies downward pressure to the upper electrode during welding is disposed below the upper electrode. A downward pressing force can be applied, and the pressurizing mechanism disposed at the lower part can be installed with almost no support frame or the like, resulting in a compact structure.
[0069]
  In addition, by applying an energizing plate that turns on and off the welding current, the pressurization to the workpiece and the energization of the welding current are separated, and the direction and magnitude of the pressurization to the welding tip of the upper electrode is a lever mechanism Therefore, welding can be achieved in effective sheet metal processing (centering on a thin plate).
[Brief description of the drawings]
FIG. 1 is a front view of a resistance welder according to one embodiment of the present invention.
FIG. 2 is an explanatory view seen from the front of one embodiment when a workpiece is welded by the resistance welding machine shown in FIG. 1;
FIG. 3 is an explanatory diagram viewed from the front of one embodiment when pressurizing and welding with the resistance welder shown in FIG. 1;
4 is an explanatory view showing a part of a cross-sectional structure of the energizing plate shown in FIG. 1. FIG.
[Explanation of symbols]
  100 resistance welding machine
                        120 Plate electrode
                        130 Welding Gun
                        131 Welding tip
                        140 Bearing member
                        141 pivot
                        142 Support stand
                        150 Pressure member
                        151 Piston and cylinder mechanism
                        152 Base frame
                        170 Current plate
                        W Workpiece

Claims (2)

The surface is connected to a welding gun (130) in which the welding tip (131) at the tip works as an upper electrode and is pivotally supported by a support member (140) in a horizontal posture and one pole (111) of a welding power source (110). Each of the plate-like electrode (120) serving as a lower electrode, and a pressure member (150 ) that pushes up the rear end of the welding gun (130) upward and pivots the welding tip (131) at the tip downward. In a resistance welding machine (100) comprising:
The welding gun (130) said bearing member (140) and said pressure member (150) so that it can move in a plane level with the support base and (142) provided for supporting the bearing member (140), the support base ( 142) is provided with a cylindrical member (143) for accommodating the pressurizing member (150) so as to be movable up and down, and is configured such that the support base (142) can be rotated on the outer periphery of the cylindrical member (143). An energizing plate (170) connected to the other pole (112) of the welding power source (110) between the rear end portion of the welding gun (130) and the pressure member (150) is connected to the welding gun (130). The energizing plate (170) is pushed up by the pressurizing member (150) and is brought into contact with the rear end of the welding gun (130) for energization. With features That resistance welding machine. At the rear end portion of the welding gun (130), a contact surface (132) for contacting the current-carrying plate (170) by pushing up the pressure member (150 ) and a contact surface (132) are provided at the lower end. A blind hole ( 171) having a large-diameter flange portion (172) , and on the other hand, a blind hole in which the rod-shaped material (171) is accommodated together with the flange portion (172) in the energizing plate (170) . 175) is formed, further, resistance welding machine according to claim 1, wherein a formed by connecting one pole of the (112) of said welding power supply (110) to the charged plates (170).

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