JP2015150577A - Electrode for spot welding device and spot welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode for a spot welding device and a spot welding method capable of improving a life of the electrode for the spot welding device.SOLUTION: An electrode 140 for a spot welding device for performing spot welding by applying a voltage between the electrode 140 for the spot welding device and the electrode 160 for the spot welding device in such a state that objects 200a, 200b to be welded are held between the electrode 140 for the spot welding device and the electrode 160 for the spot welding device opposite to the electrode 140 is provided. The electrode 140 for the spot welding device has a contact surface 131 which comes into contact with the objects 200a, 200b to be welded and, on a partial opposed region 133 of the contact surface 131, includes a movable part 130a opposite to the electrode 160 for the spot welding device and a stationary part 120 on which the movable part 130a is fixed. The stationary part 120 fixes the movable part 130a after a relative position of the movable part 130a with respect to the stationary part 120 is changed and, thereby, the opposed region 133 on the contact surface 131 is changed.

Description

  One embodiment of the present invention relates to an electrode for a spot welding apparatus and a spot welding method.

  In spot welding, a workpiece is welded by applying a voltage between the two electrodes while sandwiching the workpiece between two electrodes facing each other. For example, in the spot welding apparatus of Patent Document 1, a plurality of copper thin plates are laminated and disposed between the electrode and the workpiece to be welded so that no traces of the electrode remain on the surface of the workpiece. The plurality of copper thin plates are supported by bolts that pass through bolt holes provided in the copper thin plates. The outer diameter of the bolt is smaller than the inner diameter of the bolt hole. Therefore, each copper thin plate is supported so that it can slide freely. Thereby, in the apparatus of patent document 1, a copper thin plate is easy to deform | transform according to the shape of a to-be-welded object.

Japanese Utility Model Publication No. 5-76644

  By the way, when spot welding is repeated, only a part of the surface of the copper thin plate is recessed and the flatness is lost. In the apparatus of Patent Document 1, when the copper thin plate is recessed, one copper thin plate in contact with the workpiece is replaced with a new one. However, when spot welding is repeated, it is necessary to frequently replace the copper thin plate.

  One embodiment of the present invention has been made in consideration of the above problems, and it is desired to provide a spot welding apparatus electrode and a spot welding method that can improve the life of the spot welding apparatus electrode. .

  One embodiment of the present invention performs spot welding of an object to be welded by applying a voltage to the other electrode in a state where the object to be welded is sandwiched between the other electrode facing each other. An electrode for a spot welding apparatus for contact, having a contact surface in contact with an object to be welded, a movable part facing another electrode in a part of the contact area of the contact surface, and a fixed part for fixing the movable part The fixed portion is an electrode for a spot welding apparatus that changes the opposed region on the contact surface by fixing the movable portion after changing the relative position of the movable portion with respect to the fixed portion.

  According to this configuration, when a workpiece is sandwiched between other electrodes facing each other, a voltage is applied between the other electrodes to perform spot welding of the workpiece. An electrode for a spot welding apparatus is provided. The electrode for a spot welding apparatus has a contact surface that comes into contact with an object to be welded, and includes a movable part that faces another electrode in a part of the contact area of the contact surface, and a fixed part that fixes the movable part. The fixed portion changes the facing area on the contact surface by fixing the movable portion after changing the relative position of the movable portion with respect to the fixed portion. For this reason, even if a part of the facing region of the contact surface is recessed by spot welding, spot welding can be continued by changing the facing region to another part of the contact surface. Therefore, the lifetime of the electrode for a spot welding apparatus can be improved.

  In this case, the fixed portion has an attachment surface that is attached to the spot welding apparatus, and the attachment surface circulates the airflow sent from the spot welding device inside the fixed portion and the airflow that circulates inside the fixed portion. A vent can be included that returns to the spot welder.

  According to this configuration, the fixed portion has the attachment surface attached to the spot welding apparatus. The mounting surface includes a vent hole portion that causes the airflow sent from the spot welding device to flow inside the fixed portion and returns the airflow that flows inside the fixed portion to the spot welding device. For this reason, whether the electrode for the spot welding apparatus is correctly attached to the spot welding apparatus by detecting whether or not the airflow sent from the spot welding apparatus has flowed through the inside of the fixed part and returned to the spot welding apparatus. You can check whether or not.

  In addition, the movable part can have a refrigerant flow passage through which the refrigerant flows inside the movable part.

  According to this configuration, the movable part has the refrigerant flow passage for allowing the refrigerant to flow inside the movable part. Thereby, the movable part which becomes high temperature by spot welding can be cooled.

  Further, in another embodiment of the present invention, by applying a voltage between the first electrode and the second electrode while sandwiching an object to be welded between the first electrode and the second electrode facing each other, A spot welding method for performing spot welding of an object to be welded, wherein the first electrode has a contact surface in contact with the object to be welded, and a movable part facing the second electrode in a part of the contact area of the contact surface. A fixed portion that fixes the movable portion, and the fixed portion can fix the movable portion after changing the relative position of the movable portion with respect to the fixed portion, and is covered between the first electrode and the second electrode. Fixing the movable part after changing the relative position of the movable part with respect to the fixed part after the spot welding process of applying a voltage between the first electrode and the second electrode while sandwiching the weldment, and the spot welding process Changing the facing area on the contact surface by fixing to the part It is a spot welding method and a degree.

  In this case, before the spot welding process, the air flow sent from the spot welding device is circulated inside the fixed portion with respect to the fixed portion attached to the spot welding device provided with the second electrode, It is possible to further include an attachment confirmation step for returning the airflow that has been circulated to the spot welding apparatus.

  Further, in the spot welding process, it is possible to apply a voltage between the first electrode and the second electrode while circulating the refrigerant inside the movable part.

  According to the spot welding apparatus electrode and the spot welding method of one embodiment of the present invention, the life of the spot welding apparatus electrode can be improved.

It is a perspective view which shows the spot welding apparatus which concerns on embodiment. It is a perspective view which shows the work surface of the main body of the spot welding apparatus of FIG. It is the perspective view which looked at the fixing | fixed part of the electrode for spot welding apparatuses of FIG. 1 from the fixed surface side. It is the perspective view which looked at the fixing | fixed part of the electrode for spot welding apparatuses of FIG. 1 from the attachment surface side. It is a perspective view which shows the movable part of the electrode for spot welding apparatuses of FIG. It is a perspective view which shows the condition of the welding by the spot welding apparatus of FIG. It is a perspective view which shows the state which the recessed part produced in the opposing area | region of the contact surface of a movable part after welding. It is a perspective view which shows the state fixed after the relative position with respect to the fixing | fixed part of the movable part of FIG. 7 was changed. It is a perspective view which shows the movable part of other embodiment.

  Hereinafter, with reference to drawings, the electrode for a spot welding apparatus and the spot welding method concerning an embodiment of the present invention are explained in detail.

  As shown in FIG. 1, the spot welding apparatus 100 of 1st Embodiment is comprised as a stationary spot welding apparatus. The spot welding apparatus 100 includes a main body 110, a spot welding apparatus electrode 140, and a spot welding apparatus electrode 160. In the spot welding apparatus 100 of the present embodiment, an object to be welded is sandwiched between a spot welding apparatus electrode 140 that is a first electrode facing the spot welding apparatus electrode 160 and another electrode or a spot welding apparatus electrode 160 that is a second electrode. In this state, a voltage is applied between the spot welding device electrode 140 and the spot welding device electrode 160 to perform spot welding of the workpiece. In the present embodiment, as will be described later, the spot welding device electrode 140 includes a fixed portion 120 and a movable portion 130a.

  As shown in FIG.1 and FIG.2, the main body 110 of the spot welding apparatus 100 is comprised with copper. The main body 110 includes a work surface 111 to which the spot welding device electrode 140 is attached. The work surface 111 includes a pair of bolt holes 115 for attaching the spot welding device electrode 140. The work surface 111 includes an air hole portion 116 that sends an air flow to the fixing portion 120 of the spot welding device electrode 140. The work surface 111 is provided with an air hole portion 117 for returning the airflow of air sent from the air hole portion 116 that circulates inside the fixed portion 120 to the main body 110.

  As shown in FIG. 1, the fixed part 120 fixes the movable part 130a. The fixing part 120 is made of copper. As shown in FIGS. 1, 3, and 4, the fixed part 120 has a fixed surface 121 to which the movable part 130 is fixed. The fixing part 120 has an attachment surface 122 attached to the work surface 111 of the main body 110 of the spot welding apparatus 100 on the opposite side of the fixing surface 121. The fixing portion 120 has a pair of bolt hole portions 125 penetrating from the attachment surface 122 to the fixing surface 121 at positions corresponding to the bolt hole portions 115 of the main body 110.

  As shown in FIG. 4, the fixing portion 120 sends the airflow sent from the air hole portion 116 of the spot welding apparatus 100 to the position corresponding to the air hole portions 116 and 117 of the main body 110 of the mounting surface 122. A ventilation hole 126 is provided that returns the airflow that has been circulated inside and circulated through the inside of the fixed part 120 to the air hole 117 of the spot welding apparatus 100. In the example of FIGS. 3 and 4, the vent hole 126 is a groove provided in the mounting surface 122. Alternatively, the vent hole portion 126 can be a passage having another shape that passes through the inside of the fixing portion 120.

  The movable part 130a is made of copper. As shown in FIG.1 and FIG.5, the movable part 130a has the contact surface 131 which contacts a to-be-welded object. The movable portion 130 faces the spot welding device electrode 160 in a part of the facing region 133 of the contact surface 131. In addition, the movable part 130 has a sliding surface 132 that slides with respect to the fixed surface 121 of the fixed part 120 on the opposite side of the contact surface 131.

  The movable part 130 a has a pair of flange surfaces 134 that are closer to the sliding surface 132 than the contact surface 131 on the opposite side of the sliding surface 132. The movable part 130 a has a pair of bolt long holes 135 penetrating from the sliding surface 132 to the flange surface 134 at the position of the flange surface 134 corresponding to the bolt hole 115 of the main body 110.

  In the pair of bolt long hole portions 135, the pair of bolts 150 that have passed through the pair of bolt hole portions 115 of the main body 110 and the pair of bolt hole portions 125 of the fixing portion 120 are fixed at arbitrary positions of the bolt long hole portion 135. Is possible. Therefore, the fixed part 120 can fix the movable part 130a after changing the relative position of the movable part 130a with respect to the fixed part 120. Since the flange surface 134 is closer to the sliding surface 132 than the contact surface 131, the head of the bolt 150 does not reach the position of the contact surface 131.

  The movable part 130a has a refrigerant flow passage 137 through which a refrigerant such as water flows in the movable part 130a. Hose joints 138 and 139 are attached to both ends of the refrigerant flow passage 137.

  Hereinafter, the process in which spot welding is performed by the spot welding apparatus 100 of this embodiment is demonstrated. First, as shown in FIG. 1, a pair of bolts 150 is passed through a pair of bolt holes 115 of the main body 110, a pair of bolt holes 125 of the fixed part 120, and a pair of bolt long holes 135 of the movable part 130a. As a result, the spot welding apparatus electrode 140 is fixed to the work surface 111 of the main body 110.

  Before the spot welding process in which a voltage is applied between the spot welding device electrode 140 and the spot welding device electrode 160 while the workpiece is sandwiched between the spot welding device electrode 140 and the spot welding device electrode 160. Next, an attachment confirmation process is performed. In the attachment confirmation step, it is confirmed whether or not the spot welding device electrode 140 is attached to the work surface 111. In the attachment confirmation process, the airflow sent from the air hole portion 116 of the spot welding apparatus 100 is circulated to the inside of the fixing portion 120 through the vent hole portion 126 with respect to the fixing portion 120. The airflow circulated through the fixed portion 120 is returned to the main body 110 of the spot welding apparatus 100 through the air hole portion 117. By confirming that the airflow sent from the air hole portion 116 has returned to the air hole portion 117, it is confirmed whether or not the spot welding device electrode 140 is attached to the work surface 111.

  As shown in FIG. 6, after the attachment confirmation step, the spot welding apparatus electrode 140 and the spot welding apparatus are used while the workpieces 200a and 200b are sandwiched between the spot welding apparatus electrode 140 and the spot welding apparatus electrode 160. A spot welding process in which a voltage is applied between the electrodes 160 is performed. In the spot welding process, a voltage is applied between the spot welding device electrode 140 and the spot welding device electrode 160 while the refrigerant C flows from the hose joint 138 to the hose joint 139 in the movable portion 130a. Is done. The workpieces 200a and 200b are moved on the contact surface 131 of the movable portion 130a by a workpiece feeding mechanism (not shown).

  As shown in FIG. 7, after the spot welding process is completed, a recess D is formed in the facing region 133. Therefore, in the present embodiment, after the spot welding process, a facing area changing process for changing the facing area 133 on the contact surface 131 is performed. In the facing area changing step, the bolt 150 is loosened. As shown in FIG. 8, after the bolt 150 is loosened, the sliding surface 132 of the movable portion 130 a is slid with respect to the fixed surface 121 of the fixed portion 120, so that the movable portion 130 a is relative to the fixed portion 120. Position is changed. After the relative position of the movable part 130a with respect to the fixed part 120 is changed, the bolt 150 is tightened again.

  Accordingly, in the facing area changing step, the fixed unit 120 fixes the movable unit 130a after changing the relative position of the movable unit 130a with respect to the fixed unit 120. As a result, the facing area 133 on the contact surface 131 is changed to a place other than the recess D. After the facing area changing process is performed, the above attachment confirmation process and spot welding process are performed again. When the concave portion D is formed again in the facing region 133, a corresponding region changing step is performed.

  According to the present embodiment, a voltage is applied between the spot welding device electrode 160 in a state where the workpieces 200a and 200b are sandwiched between the opposing spot welding device electrodes 160, An electrode 140 for a spot welding apparatus for performing spot welding of the workpieces 200a and 200b is provided. The spot welding device electrode 140 has a contact surface 131 that comes into contact with the workpieces 200a and 200b, and a movable portion 130a that faces the spot welding device electrode 160 in a part of the facing region 133 of the contact surface 131 and a movable portion 130a. The fixing part 120 which fixes the part 130a is provided. The fixed part 120 changes the facing region 133 on the contact surface 131 by fixing the movable part 130a after changing the relative position of the movable part 130a with respect to the fixed part 120. For this reason, even if the concave portion D is formed in a part of the facing region 133 of the contact surface 131 by spot welding, the spot welding can be continued by changing the facing region 133 to another part of the contact surface 131. it can. Therefore, the lifetime of the electrode 140 for spot welding apparatuses can be improved.

  Further, the fixing portion 120 has an attachment surface 122 that is attached to the spot welding apparatus 100. The attachment surface 122 includes a vent hole portion 126 that allows the airflow sent from the spot welding apparatus 100 to flow inside the fixing portion 120 and returns the airflow that flows inside the fixing portion 120 to the spot welding apparatus 100. For this reason, the spot welding apparatus electrode 140 is correctly detected by detecting whether or not the airflow sent from the spot welding apparatus 100 has flowed through the inside of the fixed portion 120 and returned to the spot welding apparatus 100. It can be confirmed whether or not it is attached to.

  Some existing stationary spot welding apparatuses check whether or not the spot welding apparatus electrode is correctly attached to the spot welding apparatus by circulating an air flow inside the spot welding apparatus electrode. However, in such an apparatus, if the entire spot welding apparatus electrode is moved, it becomes impossible to circulate the air flow inside the spot welding apparatus electrode. On the other hand, in this embodiment, in order to circulate the air flow inside the fixed part 120 and move only the movable part 130a, while confirming whether the spot welding apparatus electrode 140 is correctly attached to the spot welding apparatus 100, The life of the spot welding device electrode 140 can be improved.

  Moreover, the movable part 130a has the refrigerant | coolant flow path 137 which distribute | circulates a refrigerant | coolant inside the movable part 130a. Therefore, the movable part 130a which becomes high temperature by spot welding can be cooled.

  In the present embodiment, the flange surface 134 is closer to the sliding surface 132 than the contact surface 131, so the head of the bolt 150 does not reach the position of the contact surface 131. Therefore, spot welding of the workpieces 200a and 200b larger than the contact surface 131 can be performed.

  Embodiments of the present invention are not limited to the above-described embodiments, and various modifications are possible. For example, it is also possible to adopt a mode in which the flange surface 134 is not provided as in the movable portion 130b of the second embodiment shown in FIG. In addition, the aspect in which the fixed part 120 fixes the movable parts 130a and 130b after changing the relative positions of the movable parts 130a and 130b with respect to the fixed part 120 is limited to the aspect using the bolt long hole part 135 described above. However, a mode using rails or other means is included.

  DESCRIPTION OF SYMBOLS 100 ... Spot welding apparatus, 110 ... Main body, 111 ... Working surface, 115 ... Bolt hole part, 116, 117 ... Air hole part, 120 ... Fixing part, 121 ... Fixing surface, 122 ... Mounting surface, 125 ... Bolt hole part, 126: Ventilation hole portion, 130a, 130b ... Movable portion, 131 ... Contact surface, 132 ... Sliding surface, 133 ... Opposing area, 134 ... Flange surface, 135 ... Bolt long hole portion, 137 ... Refrigerant flow passage, 138, 139 DESCRIPTION OF SYMBOLS ... Joint for hose, 140 ... Electrode for spot welding device, 150 ... Bolt, 160 ... Electrode for spot welding device, C ... Refrigerant, D ... Recess.

Claims (6)

For a spot welding apparatus for performing spot welding of the workpiece by applying a voltage to the other electrode in a state in which the workpiece is sandwiched between other electrodes facing each other. An electrode,
A movable portion having a contact surface in contact with the workpiece, and facing the other electrode in a partial facing region of the contact surface;
A fixed part for fixing the movable part;
With
The said fixed part is an electrode for spot welding apparatuses which changes the said opposing area | region in the said contact surface by fixing the said movable part after changing the relative position of the said movable part with respect to the said fixed part. The fixed portion has an attachment surface attached to a spot welding apparatus,
The mounting surface includes a vent hole portion that circulates an airflow sent from the spot welding device to the inside of the fixed portion and returns the airflow that has circulated through the inside of the fixed portion to the spot welding device. 2. The electrode for a spot welding apparatus according to 1.   The electrode for a spot welding apparatus according to claim 1, wherein the movable part has a refrigerant flow passage for allowing a refrigerant to flow inside the movable part. Spot welding of the workpiece is performed by applying a voltage between the first electrode and the second electrode while sandwiching the workpiece between the first electrode and the second electrode facing each other. A spot welding method,
The first electrode has a contact surface that comes into contact with the workpiece, a movable portion that faces the second electrode in a partial facing region of the contact surface, and a fixed portion that fixes the movable portion. The fixed part is capable of fixing the movable part after changing the relative position of the movable part with respect to the fixed part,
A spot welding step of applying a voltage between the first electrode and the second electrode while sandwiching the workpiece between the first electrode and the second electrode;
After the spot welding step, the opposed region changing step of changing the opposed region on the contact surface by changing the relative position of the movable portion with respect to the fixed portion and then fixing the movable portion to the fixed portion. When,
A spot welding method comprising:   Prior to the spot welding process, an air flow sent from the spot welding device is circulated in the fixing portion with respect to the fixing portion attached to the spot welding device including the second electrode, and the fixing is performed. The spot welding method according to claim 4, further comprising an attachment confirmation step of returning the airflow that has circulated through the inside of the part to the spot welding apparatus.   6. The spot welding method according to claim 4, wherein, in the spot welding step, a voltage is applied between the first electrode and the second electrode while circulating a coolant through the movable portion.

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