JP2012206127A - Pressurizing force detecting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressurizing force detecting tool with which pressurizing force of a member to be welded with a fixing side electrode and a movable side electrode can be easily and surely detected.SOLUTION: In the pressurizing force detecting tool 10 in which a member to be welded is held and pressurized with a first welding electrode 132, a controlled pressurizing part 134 which is adjacent to the first welding electrode 132 and abutted on the member to be welded and a second welding electrode 133 which is opposed to the first welding electrode 132 and abutted on the member to be welded, and with which the pressurizing force of a spot welding device 130 performing spot welding is performed by supplying electric current between the first welding electrode 132 and the second welding electrode 133 in the held and pressurized state, the tool includes: a base part 21 which has the abutting range R1 on which the controlled pressurizing part 134 abuts from the side of the first welding electrode 132; a first pressurizing force sensor 30 which is provided to the side of the abutting range R1 of the base part 21 and detects the pressurizing force of the first welding electrode 132; and second pressurizing force sensor 31 which is provided to the base part 21 with respect to the first pressurizing force sensor 30 via the base part 21 and detects the pressurizing force of the second welding electrode 133.

Description

  The present invention relates to a pressure detection tool, and more particularly to a pressure detection tool that detects a pressure applied by a welding electrode for a spot welding apparatus.

  In general, for joining plate materials such as stacked steel plates, a large current is passed between the welding electrodes for a certain period of time while applying pressure between the pair of welding electrodes, and the joint is raised to almost the melting temperature. Spot welding to form nuggets is widely performed.

  Here, as shown in FIG. 10, spot welding is performed on a member to be welded 100 in which three sheets of a thin plate 101 having low rigidity, a first thick plate 102 having a higher rigidity than the thin plate 101, and a second thick plate 103 are overlapped. The movable side electrode 121 and the fixed side electrode 122 cover the thin plate 101 and the first thick plate 102 and the first thick plate 102 and the second thick plate 103 are in close contact with each other without a gap. Energization is performed with the welding member 100 interposed therebetween.

  However, when the member to be welded 100 is pressed between the movable side electrode 121 and the fixed side electrode 122, the thin plate 101 and the first thick plate 102 having low rigidity are bent upward, and the thin plate 101 and the first thick plate 102 are bent upward. And a gap is formed between the first thick plate 102 and the second thick plate 103. When spot welding is performed in this state, the amount of penetration between the plates varies and the welding strength becomes unstable. As a result, there is a concern that the welding quality may vary and peeling of each plate may occur.

  As such a countermeasure, there is a spot welding method disclosed in Patent Document 1. As shown in FIG. 11, the spot welding apparatus 110 used in the spot welding method of Patent Document 1 includes a movable side electrode 111 and a fixed side electrode 112, and is mounted on the wrist 121 of the welding robot 120. The welding robot 120 moves the spot welding apparatus 110 to each spot position of the member to be welded 100, which is supported by the clamper 122 and on which the thin plate 101, the first thick plate 102, and the second thick plate 103 are superimposed, and is welded. Spot welding of the member 100 is performed.

  At this time, according to teaching data stored in advance in a controller (not shown), the spot welding apparatus 110 is moved up so that the applied pressure FU of the movable electrode 110 contacting the thin plate 101 is brought into contact with the second thick plate 103. The pressure is smaller than the applied pressure FL of the fixed electrode 111 (FU <FL).

  As a result, the contact resistance between the thin plate 101 and the first thick plate 102 is increased and the contact resistance between the first thick plate 101 and the second thick plate 103 is decreased, so that the movable side electrode 110 and the fixed side electrode are reduced. When energized between the thin plate 101 and the first thick plate 102, the amount of heat generated at the joint between the thin plate 101 and the first thick plate 102 can be increased, and the welding strength between the thin plate 101 and the first thick plate 102 can be increased.

  However, in a state where the member to be welded 100 held by the clamper 122 is sandwiched and pressurized by the movable side electrode 111 and the fixed side electrode 112, the spot welding apparatus 110 is moved up and moved by the pressure FL of the fixed side electrode 112. In order to reduce the pressure FU applied by the side electrode 111, a large load is required for the clamper 122 that holds the member to be welded 100. On the other hand, in a state where the clamp position of the member to be welded 100 by the clamper 122 and the welding spot position are separated from each other, the member to be welded 100 is bent and deformed, and the pressing force FU by the fixed side electrode 112 and the pressing force FU by the movable side electrode 111. And it is difficult to secure a stable contact resistance between the thin plate 101 and the first thick plate 102 and a contact resistance between the first thick plate 102 and the second thick plate 103. The current density at 100 joints varies, and there is a concern that the quality of spot welding may deteriorate.

  In view of this, the present inventors have proposed a spot welding method and a spot welding apparatus capable of obtaining a uniform and stable welding quality when spot-welding members to be welded such as stacked steel plates. An outline of the spot welding method and the spot welding apparatus will be described with reference to FIGS.

  The spot welding apparatus 130 used in the spot welding method includes a base (not shown) attached to the wrist of the welding robot, and a C-shaped yoke 131 extending downward is attached to the base. A fixed electrode 132 that contacts the second thick plate 103 is provided at the lower end of the C-shaped yoke 131. A movable side electrode 133 that is opposed to the fixed side electrode 132 and is formed to be movable back and forth along the axis of the fixed side electrode 132 and is in contact with the thin plate 101 is attached to the base.

  On the other hand, a control pressurizing means 134 formed to be movable between the fixed side electrode 132 and the movable side electrode 133 is provided at the base. The control pressurizing means 134 includes cylinders 135 and 136, cylinder rods 135a and 136a protruding from the tips of the cylinders 135 and 136, and a connecting plate 137 provided between the cylinder rods 135a and 136a.

  The connecting plate 137 is provided with a belt-like welded member presser 138 extending in a direction away from the C-shaped yoke 131 between the cylinder rods 135a and 136a. The fixed side electrode 132, An electrode insertion portion 138a is formed that is cut out in a concave shape into which the movable electrode 133 can be inserted. A pair of restricting portions 138b are formed to project from both sides of the electrode insertion portion 138a, and a semicircular arc shaped control pressurizing portion 138c and a restricting portion 138b projecting along the electrode insertion portion 138a on the lower surface of each restricting portion 138b. A semicircular arc-shaped control pressurizing portion 138d protruding along the electrode insertion portion 138a is provided on the upper surface of each of the upper surfaces of the upper and lower portions of the upper surface of the movable side electrode 133 so as to be adjacent to each other.

  As a result, as shown in FIG. 13, the fixed electrode 132, the movable electrode 133, the movable electrode 133, and the control pressurizing unit 138 c of the control pressurizing unit 134 adjacent to the movable electrode 133 are covered. The welding member 100 is nipped and pressurized. Due to the control pressure Fα applied to the thin plate 101 by the control pressurizing unit 138c, the pressure applied by the movable electrode 133 on the thin plate 101 side becomes smaller than the pressure applied by the fixed side electrode 132 on the second thick plate 103 side (FU < FL). In this state, when a current is passed between the fixed side electrode 132 and the movable side electrode 133, the current density at the joint between the thin plate 101 and the first thick plate 102 becomes relatively high, and the thin plate 101 changes to the second thick plate 103. A good nugget with no deviation in the amount of penetration is formed, and the welding quality for the member to be welded 100 is improved.

JP 2003-251469 A

  According to the spot welding apparatus 130 proposed by the present inventors, the member to be welded 100 is sandwiched and pressurized by the fixed electrode 132, the movable electrode 133, and the control pressurizing unit 138c of the control pressurizing means 134. The member to be welded can be welded with high welding quality. In order to maintain such improved welding quality, it is required to periodically detect and confirm the pressure applied to the member to be welded 100 by the fixed side electrode 132 and the movable side electrode 133.

  Accordingly, an object of the present invention made in view of such a point is to provide a pressure detection tool capable of easily and reliably detecting the pressure of a member to be welded by a fixed side electrode and a movable side electrode. .

  The pressurizing force detection tool according to the first aspect of the present invention for solving the above-described problem is characterized in that the first welding electrode abutting against a member to be welded on which a plurality of plate members are stacked, and the first welding electrode adjacent to the first welding electrode. The member to be welded is sandwiched and pressurized by a control pressurizing unit that contacts the member to be welded and a second welding electrode that contacts the member to be welded so as to face the first welding electrode. A pressure detection tool for detecting a pressure applied to the first welding electrode and the second welding electrode of a spot welding apparatus for conducting spot welding by energizing between the first welding electrode and the second welding electrode, A base portion having a contact range where the control pressurizing portion contacts from the first welding electrode side, and a first pressure that is provided on the contact range side of the base portion and detects the pressure applied to the first welding electrode. A pressure sensor and the first pressure sensor Interposed the over scan portion, characterized in that it comprises a second pressure sensor for detecting the pressure of the second welding electrode provided on the base portion.

  According to this invention, when detecting the applied pressure of the first welding electrode and the second welding electrode, the control welding portion adjacent to the first welding electrode and the first welding electrode and the second welding facing the first welding electrode. A pressure detection tool is inserted between the electrodes. At this time, the control pressurizing part adjacent to the first welding electrode is brought into contact with the contact range of the base part, and the first pressure sensor facing the first welding electrode is pressed by the first welding electrode. On the other hand, the second welding electrode presses the second pressure sensor facing the second welding electrode.

  As a result, the first welding electrode, the control pressurizing part, and the second welding electrode are sandwiched and pressed by the first pressurizing sensor and the second pressurizing sensor via the base part, and are controlled to come into contact with the contact range. The pressure applied to the first welding electrode is detected by the first pressure sensor, and the pressure applied to the second welding electrode is detected by the second pressure sensor without being affected by the control pressure of the pressurizing unit. Therefore, each applied pressure can be detected appropriately and easily with high accuracy.

  According to a second aspect of the present invention, in the pressure detection tool according to the first aspect, the base portion has a first surface that is substantially circular in plan view and a second surface that faces the first surface. The first pressure sensor is formed in a disk shape having a small diameter with respect to the first surface, and has a small diameter with respect to the first surface at a central portion in the inner diameter direction of the first surface. The contact range is formed in an annular shape on the first surface along the outer periphery of the mounting range of the first surface.

  According to the present invention, the annular contact range is formed on the first surface along the outer periphery of the attachment range of the first pressure sensor set on the first surface. Accordingly, a contact range in which the control pressurizing unit is brought into contact with the base portion can be formed by a simple configuration using the disk-shaped base portion and the first pressure sensor having a small-diameter disk shape. Further, it is possible to easily configure a pressure detection tool that can appropriately detect the pressure of the spot welding apparatus.

  According to a third aspect of the present invention, there is provided a pressure detection tool according to a third aspect of the present invention, wherein the first welding electrode is in contact with a member to be welded on which a plurality of plate members are superimposed, and is in contact with the member to be welded adjacent to the first welding electrode. The member to be welded is sandwiched and pressurized by the pressurizing portion and the second welding electrode that faces the member to be welded so as to face the first welding electrode, and the first welding electrode and the first welding member are sandwiched and pressurized. 2 is a pressure detection tool for detecting pressure applied to the first welding electrode and the second welding electrode of a spot welding apparatus that conducts spot welding by energizing between two welding electrodes, and has a first circular shape in a plan view. A receiving plate formed in a disk shape having a surface and a second surface opposite to the first surface, and a protrusion set in a central portion in the inner diameter direction of the first surface of the receiving plate with a small diameter with respect to the first surface A cylindrical shape protruding in an axial direction from the range, and the first surface A projecting portion having a facing projecting portion surface at an end, and an annular shape formed on the first surface along an outer periphery of the projecting range of the projecting portion, and the control pressurizing portion is contacted from the first welding electrode side. A contact range to be in contact with, a first pressure sensor that is provided on the surface of the projecting portion and detects the pressure of the first welding electrode, and a pressure force of the second welding electrode that is provided on the second surface. And a second pressure sensor.

  According to the present invention, an annular contact range is formed along the outer periphery of the protruding range of the protruding portion set to have a small diameter with respect to the first surface. Therefore, even when the first pressure sensor provided on the protrusion surface and the second pressure sensor provided on the second surface are formed with a relatively large diameter, the control pressurizing portion is the first welding electrode. It contacts the contact area of the receiving plate from the side. The first pressurization sensor and the second pressurization sensor are sandwiched and pressurized by the first welding electrode and the second welding electrode with the receiving plate and the protruding portion interposed therebetween in the contact state of the control pressurization unit, and the contact range The pressure applied to the first welding electrode is detected by the first pressure sensor, and the pressure applied to the second welding electrode is detected by the second pressure sensor without being affected by the control pressure of the control pressurizing unit that is in contact with the pressure. The Therefore, each applied pressure can be detected appropriately and easily with high accuracy.

  According to a fourth aspect of the present invention, there is provided a pressure detection tool according to a first aspect of the present invention, wherein the first welding electrode is in contact with a member to be welded on which a plurality of plate members are superposed, and the control is in contact with the member to be welded adjacent to the first welding electrode. The member to be welded is sandwiched and pressurized by the pressurizing portion and the second welding electrode that faces the member to be welded so as to face the first welding electrode, and the first welding electrode and the first welding member are sandwiched and pressurized. A pressure detection tool for detecting a pressure force of the first welding electrode and the second welding electrode of a spot welding apparatus that conducts spot welding by energizing between two welding electrodes, the first surface and the first surface A receiving plate having a second surface facing the first welding electrode so that the control pressurizing portion can come into contact with the first welding electrode, and a pressure sensor provided on the first surface of the receiving plate; The pressure sensor is disposed in front of the first welding electrode. The control pressure member is brought into contact with the first surface of the receiving plate from the first welding electrode side, and the pressing sensor is pressed by the first welding electrode, and the second welding electrode is connected to the second surface of the receiving plate. The pressure sensor is clamped and pressed against the surface to detect the pressure of the first welding electrode, and the pressure sensor is opposed to the second welding electrode from the first welding electrode side. The control pressurizing part is brought into contact with the second surface of the receiving plate, the first welding electrode is brought into contact with the second surface of the receiving plate, and the pressure sensor is pressed by the second welding electrode, The pressure sensor is sandwiched and pressurized, and the pressure of the second welding electrode is detected.

  According to this invention, when detecting the applied pressure of the first welding electrode and the second welding electrode, the control welding portion adjacent to the first welding electrode and the first welding electrode and the second welding facing the first welding electrode. A pressure detection tool is inserted between the electrodes.

  The pressure sensor is opposed to the first welding electrode, the control pressurizing unit is brought into contact with the receiving plate from the first welding electrode side, and the first pressure sensor facing the first welding electrode is pressed by the first welding electrode. At the same time, the second welding electrode is brought into contact with the receiving plate. As a result, the pressure sensor is sandwiched and pressurized by the first welding electrode, the control pressurizing unit, and the second welding electrode via the receiving plate, and the control pressurizing force of the control pressurizing unit that contacts the receiving plate is affected. The pressure force of the first welding electrode is detected by the pressure sensor without receiving.

  On the other hand, the pressure sensor is opposed to the second welding electrode, the control pressurizing unit is brought into contact with the receiving plate from the first welding electrode side, and the pressure sensor facing the second welding electrode is pressed by the second welding electrode. At the same time, the first welding electrode is brought into contact with the receiving plate. As a result, the pressure sensor is sandwiched and pressurized by the first welding electrode, the control pressurizing unit, and the second welding electrode via the receiving plate, and the control pressurizing force of the control pressurizing unit that contacts the receiving plate is affected. The pressure of the second welding electrode is detected by the pressure sensor without receiving the pressure.

  Accordingly, the pressure applied by the first welding electrode and the pressure applied by the second welding electrode can be detected individually, so that the pressure applied to each welding electrode can be appropriately determined by a simple configuration provided with a single pressure sensor. Can be detected.

  A pressure detection tool according to a fifth aspect of the present invention is the pressure detection tool according to any one of the first to fourth aspects, wherein the pressure sensor, the first pressure sensor, and the second pressure force. The sensor is formed of a piezoelectric element. According to the present invention, since the pressure sensor, the first pressure sensor, and the second pressure sensor can be configured by existing piezoelectric elements, a highly versatile pressure detection tool can be obtained with a simple configuration.

  According to the present invention, the first pressure sensor and the second pressure sensor are sandwiched and pressurized by the first welding electrode, the control pressure unit, and the second welding electrode through the base portion, and are applied to the contact range. The pressure applied to the first welding electrode is detected by the first pressure sensor, and the pressure applied to the second welding electrode is detected by the second pressure sensor without being affected by the control pressure applied by the control pressurizing unit in contact therewith. Therefore, each applied pressure can be detected appropriately and easily with high accuracy.

(A) is a figure explaining the outline of the applied pressure measuring tool which concerns on 1st Embodiment, (b) is A arrow directional view of (a). Similarly, it is a disassembled perspective view of the pressurization detection tool concerning this embodiment. It is a figure explaining the outline which detects the applied pressure of a spot welding apparatus with the applied pressure detection tool which concerns on this Embodiment. Similarly, it is a figure which illustrates typically the outline which detects the pressurization force by the fixed side electrode and movable side electrode in a spot welding apparatus with a pressurization force detection tool. (A) is a figure explaining the outline of the applied pressure detection tool which concerns on 2nd Embodiment, (b) is a figure explaining the state which abbreviate | omitted the applied pressure sensor in the B arrow directional view of (a). Similarly, it is a figure explaining the outline of the applied pressure detection tool which concerns on this Embodiment. It is a figure which illustrates typically the outline which detects the applied pressure of a spot welding apparatus with the applied pressure detection tool which concerns on this Embodiment. (A) is a figure explaining the outline of the applied pressure detection tool which concerns on 3rd Embodiment, (b) is a C arrow directional view of (a), (c) is a figure explaining the outline of a receiving plate. . It is a figure which illustrates typically the outline which detects the applied pressure of a spot welding apparatus with the applied pressure detection tool which concerns on this Embodiment. It is a figure explaining the outline of the conventional spot welding method. Similarly, it is a figure explaining the outline of the conventional spot welding apparatus. It is a figure explaining the outline of the spot welding apparatus which the present inventors proposed. It is a figure explaining the effect | action of the pressurization force by the spot welding apparatus which the present inventors proposed.

(First embodiment)
Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4, the same components as those in FIG. 12 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1A is a diagram for explaining the outline of the pressure detection tool according to the present embodiment, FIG. 1B is a view as viewed from the arrow A in FIG. 1A, and FIG. It is a disassembled perspective view. As shown in the figure, the pressure detection tool 10 includes a gripping part 11, a shaft part 12, and a pressure detection part 20 provided on the shaft part 12 as main components.

  The grip portion 11 has a cylindrical shape having one end 11a and the other end 11b, and is made of plastic resin. An insertion hole 11c into which the shaft portion 12 is inserted is formed on one end 11a side of the grip portion 11, and has the same diameter as the insertion hole 11c and extends from the one end 11a to the other end 11b along the axial direction of the grip portion 11. A through hole 11e is formed which is continuous with the wiring hole 11d formed on the other end 11b side.

  The shaft portion 12 has a hollow pipe shape having a base end 12a and a tip end 12b, and is formed of a highly rigid metal material. As for this axial part 12, the base end 12a side is inserted in the insertion hole 11c of the holding part 11. FIG. On the other hand, a pressure detection unit 20 is formed on the distal end 12 b side of the shaft 12.

  The pressure detection unit 20 includes a receiving plate 21 serving as a base and a first pressure sensor 30 and a second pressure sensor 31 provided on the receiving plate 21 as main components. The receiving plate 21 includes a first pressure sensor mounting surface 22 which is a first surface having a substantially circular shape in plan view, a second pressure sensor mounting surface 23 which is a second surface facing the first pressure sensor mounting surface 22, The first pressure sensor mounting surface 22 and the second pressure sensor mounting surface 23 are formed in a disk shape having a side surface 24 that is continuous. The side surface 24 is formed with a coupling hole 24a to which the tip 12b of the shaft portion 12 is coupled. The coupling hole 24a has the same diameter as that of the coupling hole 24a and continues to the inner diameter direction of the receiving plate 21. The first pressure sensor mounting surface opening 22a and the second pressure sensor mounting surface 23 open to the first pressure sensor mounting surface 22 by branching to the sensor mounting surface 22 and the second pressure sensor mounting surface 23, respectively. A through hole 25 penetrating to the second pressure sensor mounting surface opening 23a is formed.

  The first pressure sensor 30 and the second pressure sensor 31 are disk-shaped having a small diameter with respect to the first pressure sensor mounting surface 22 and the second pressure sensor mounting surface 23 of the receiving plate 21, and are known piezoelectric elements. Formed by elements. Each of the first pressure sensor 30 and the second pressure sensor 31 is provided with a wiring 32.

  Each wiring 32 is inserted into the first pressure sensor mounting surface opening 22 a and the second pressure sensor mounting surface opening 23 a of the receiving plate 21, passes through the through hole 25, and is formed on the side surface 24 of the receiving plate 21. It escapes from the formed coupling hole 24a. The wiring 32 that has come out of the coupling hole 24a is inserted into the hollow portion from the distal end 12b side of the shaft portion 12 formed in a hollow pipe shape, and comes out from the proximal end 12a side of the shaft portion 12. In this state, the shaft portion 12 is pushed and inserted into the coupling hole 24a of the receiving plate 21 from the tip 12b side, and then the portion is welded to fix the receiving plate 21 to the shaft portion 12.

  On the other hand, the wiring 32 that has come out of the base end 12 a of the shaft portion 12 is inserted from the insertion hole 11 c formed on the one end 11 a side of the grip portion 11 and from the wiring hole 11 d formed on the other end 11 b of the grip portion 11. Get out.

  In this state, the shaft portion 12 is pushed and inserted into the insertion hole 11 c of the grip portion 11 from the base end 12 b side, and the shaft portion 12 is fixed coaxially with the grip portion 11. The wiring 32 that has come out of the wiring hole 11d is connected to a measuring device (not shown).

  Furthermore, the first pressure sensor 30 and the second pressure sensor 31 having a small diameter with respect to the first pressure sensor mounting surface 22 and the second pressure sensor mounting surface 23 of the receiving plate 21 are respectively mounted on the first pressure sensor. In the mounting ranges O1 and O2 that are set to have a small diameter with respect to the first pressure sensor mounting surface 22 and the second pressure sensor mounting surface 23 at a substantially central portion in the inner diameter direction of the surface 22 and the second pressure sensor mounting surface 23, respectively. Each is fixed. And the cyclic | annular contact | abutting range R1 along the outer periphery of the attachment range O1 and O2 set to the 1st pressurization sensor attachment surface 22 and the 2nd pressurization sensor attachment surface 23 is formed. Thereby, the pressure detection tool 10 is comprised.

  Next, the case of detecting the applied pressure of the spot welding apparatus 130 with the applied pressure detection tool 10 will be described with reference to FIGS. 3 and 4. The first welding electrode corresponds to the fixed side electrode 132, and the second welding electrode corresponds to the movable side electrode 133.

  As shown in FIG. 3, the connecting plate 137 of the spot welding apparatus 130 is lowered to the fixed electrode 132 side by the cylinders 135 and 136 and positioned at the lowered position H1, and the pressure detection tool 10 is placed above the connecting plate 137. Thus, it is inserted between the fixed side electrode 132 and the movable side electrode 133. The control pressure member 138d of the coupling plate 137 is brought into contact with the contact range R1 of the first pressure sensor mounting surface 22 of the receiving plate 21 and the first pressure sensor provided on the first pressure sensor mounting surface 22 is contacted. The pressure sensor 30 is brought into contact with the fixed side electrode 132. In this state, the movable electrode 133 is lowered and brought into contact with the second pressure sensor 31 provided on the second pressure sensor mounting surface 23.

  As a result, as shown in FIG. 4, the control pressure unit 138 d of the connecting plate 137 contacts the contact range R <b> 1 of the receiving plate 21, and the control pressure unit 138 d, the fixed side electrode 132, and the movable side electrode 133 apply pressure. The pressure detection unit 20 is nipped and pressurized. Then, the first pressure sensor 30 is pressed by the fixed side electrode 132, an electromotive force corresponding to this press is generated in the first pressure sensor 30, and the second pressure sensor 31 is pressed by the movable side electrode 133. An electromotive force corresponding to this pressing is generated in the second pressure sensor 31. These electromotive forces are applied to a measuring device (not shown) via the wiring 32, and the applied pressures FL and FU corresponding to the applied electromotive force are measured by the measuring device. Since the control pressurizing force by the control pressurizing portion 138d of the welded member presser 138 provided in the control pressurizing means 134 is applied to the contact range R1 of the first pressurizing sensor mounting surface 22 of the receiving plate 21, It does not affect the detection of the applied pressures FL and FU.

  According to the pressure detection tool 10 having the above configuration, the control pressure unit 138d of the connection plate 137 of the control pressure unit 134 contacts the contact range R1 of the receiving plate 21, and the control pressure unit 138d and the fixed electrode 132 are contacted. Since the first pressure sensor 30 and the second pressure sensor 31 are sandwiched and pressurized through the receiving plate 21 by the movable side electrode 133 and the movable side electrode 133, based on the electromotive force generated corresponding to this pressurization. The applied pressures FL and FU can be detected appropriately and easily with high accuracy.

  Therefore, since the applied pressures FL and FU by the fixed side electrode 132 and the movable side electrode 133 can be appropriately measured by the measuring device, the applied pressures of the fixed side electrode 132 and the movable side electrode 133 can be appropriately adjusted, and the welding quality can be adjusted. Contribute to improvement.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 5-7, the same code | symbol is attached | subjected to the structure similar to FIGS. 1-4 and FIG. 12, and the detailed description is abbreviate | omitted.

  FIG. 5A is a diagram for explaining the outline of the pressure detection tool according to the present embodiment, and FIG. 5B is a diagram in which the pressure sensor is omitted from the B arrow view of FIG. FIG. 6 is an exploded perspective view of the pressure detection tool, and FIG. 7 is a diagram schematically illustrating an outline of the case where the pressure of the spot welding apparatus is detected by the pressure detection tool. As shown in FIGS. 5 and 6, the pressure detection tool 40 includes a gripping part 11, a shaft part 12, and a pressure detection part 50 provided on the shaft part 12 as main components.

  The pressure detection unit 50 includes a receiving plate 51 and a protrusion 60 formed continuously from the receiving plate 51, a first pressure sensor 70, and a second pressure sensor 71 as main components. The receiving plate 51 includes a protruding portion forming surface 52 that is a first surface having a substantially circular shape in plan view, a second pressure sensor mounting surface 53 that is a second surface facing the protruding portion forming surface 52, and a protruding portion forming surface 52. It has a side surface 54 continuous with the second pressure sensor mounting surface 53 and is formed in a disk shape.

  In the protruding portion forming surface 52, a protruding portion 60 protruding from a protruding range P set to have a small diameter with respect to the protruding portion forming surface 52 is formed at a substantially central portion in the inner diameter direction of the protruding portion forming surface 52. The protruding portion 60 is continuous from the protruding portion forming surface 52 and protrudes in the axial direction of the protruding portion forming surface 52. The protruding portion 60 is continuous from the side surface 61 and protrudes from the protruding portion forming surface 52 of the receiving plate 51. The first pressure sensor mounting surface 62 having a substantially circular shape in plan view, which is a part surface, is formed at the end. As a result, an annular contact range R <b> 2 along the outer periphery of the protruding range P is formed on the protruding portion forming surface 52.

  On the other hand, the side surface 54 of the receiving plate 51 is formed with a coupling hole 54a to which the tip 12b of the shaft portion 12 is coupled. The coupling hole 54a has the same diameter as the coupling hole 54a and continues to the inner diameter direction of the receiving plate 51. The second pressure sensor mounting surface opening 53a and the first pressure force branch from the portion to the second pressure sensor mounting surface 53 and the first pressure sensor mounting surface 62 side, respectively, and open to the second pressure sensor mounting surface 53. A through hole 55 penetrating to the first pressure sensor mounting surface opening 62a that opens to the sensor mounting surface 62 is formed.

  The first pressurizing sensor 70 and the second pressurizing sensor 71 are disk-shaped having substantially the same diameter as the protruding portion forming surface 52 and the second pressurizing sensor mounting surface 53 of the receiving plate 51, and are formed by a known piezoelectric element. Is done. Each of the first pressure sensor 70 and the second pressure sensor 71 is provided with a wiring 72.

  Each wiring 72 is inserted from the second pressure sensor mounting surface opening 53a and the first pressure sensor mounting surface opening 62a of the receiving plate 51 and comes out of the coupling hole 54a formed in the side surface 54 of the receiving plate 51, Similar to the first embodiment, it is inserted into the grip portion 11 via the shaft portion 12 and comes out of the wiring hole 11 d of the grip portion 11. In this state, the receiving plate 51 is fixed to the shaft portion 12, the shaft portion 12 is fixed coaxially with the grip portion 11, and the first pressure sensor 70 is attached to the first pressure sensor mounting surface 62 of the protrusion 60. The second pressure sensor 71 is fixed to the second pressure sensor mounting surface 53 of the receiving plate 51. Thereby, the pressure detection tool 40 is comprised.

  Next, the case where the applied pressure detection tool 40 detects the applied pressure by the fixed electrode 132 and the movable electrode 133 in the spot welding apparatus 130 will be described.

  First, as shown in FIG. 3, the connecting plate 137 of the spot welding apparatus 130 is lowered to the fixed side electrode 132 side by the cylinders 135 and 136 and positioned at the lowered position H2, and the electrode insertion portion 138a of the connecting plate 137 is moved to the electrode insertion portion 138a. The pressure detection tool 40 is inserted from the protrusion 60. Then, the control pressure member 138d of the connection plate 137 is brought into contact with the contact range R2 of the protruding portion forming surface 52 of the receiving plate 51, and the first pressure sensor 70 provided on the first pressure sensor mounting surface 62 is contacted. Is brought into contact with the fixed electrode 132. In this state, the movable electrode 133 is lowered and brought into contact with the second pressure sensor 71 provided on the second pressure sensor mounting surface 53 of the receiving plate 51.

  As a result, as shown in FIG. 7, the control pressure unit 138 d of the connecting plate 137 contacts the contact range R <b> 2 of the receiving plate 51, and is applied by the control pressure unit 138 d, the fixed side electrode 132, and the movable side electrode 133. The pressure detection unit 50 is nipped and pressurized. Then, the first pressure sensor 70 is pressed by the fixed electrode 132, an electromotive force corresponding to this press is generated in the first pressure sensor 70, and the second pressure sensor 71 is pressed by the movable electrode 133. An electromotive force corresponding to this pressing is generated in the second pressure sensor 71. These electromotive forces are applied to a measurement device (not shown) via the wiring 72, and the applied pressures FL and FU corresponding to the applied electromotive force are measured by the measurement device. Since the control pressurizing force by the control pressurizing portion 138d of the connecting plate 137 provided in the control pressurizing means 134 is applied to the protruding portion forming surface 52 of the receiving plate 51, the detection of the pressurizing forces FL and FU is affected. There is no effect.

  According to the pressure detection tool 40 having the above configuration, an annular contact range R2 is formed along the outer periphery of the protruding range P of the protruding portion 60 set to a small diameter with respect to the protruding portion forming surface 52. Even when the first pressure sensor 70 provided on the first pressure sensor mounting surface 52 and the second pressure sensor 71 provided on the second pressure sensor mounting surface 53 are formed with a relatively large diameter. The control pressure unit 138d contacts the contact range R2 without being obstructed by the receiving plate 51. In this contact state, the first pressure sensor 70 and the second pressure sensor 71 are sandwiched and pressed by the fixed electrode 132 and the movable electrode 133 with the receiving plate 51 and the protrusion 60 interposed therebetween, and the contact range. The first pressurizing sensor 70 facing the fixed electrode 132 and the second pressurizing sensor 71 facing the movable electrode 133 are pressed without being affected by the control pressurizing force by the control pressurizing unit 138d in contact with R2. Based on the electromotive force generated in response to this pressing, the applied pressures FL and FU by the fixed side electrode 132 and the movable side electrode 133 can be detected appropriately.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. In FIGS. 8 and 9, the same components as those in FIGS. 1 to 7 and 12 are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 8A is a diagram for explaining the outline of the pressure detection tool according to the present embodiment, FIG. 8B is a view taken in the direction of arrow C in FIG. 8A, and FIG. 8C is a receiving plate. FIG. 9 is a diagram schematically illustrating an outline in the case of detecting a pressing force of a spot welding apparatus with a pressing force detection tool.

  As shown in FIG. 8, the pressure detection tool 80 includes a gripping unit 11, a shaft 12, and a pressure detection unit 90 provided on the shaft 12 as main components.

  The pressure detection unit 90 includes a receiving plate 91 and a pressing force sensor 30 provided on the receiving plate 91 as main components. The receiving plate 91 includes a pressure sensor mounting surface 92 that is a first surface that is substantially circular in plan view, an electrode contact surface 93 that is a second surface facing the pressure sensor mounting surface 92, and a pressure sensor mounting surface 92. It has a side surface 94 continuous with the electrode contact surface 93 and is formed in a disk shape. The side surface 94 is formed with a coupling hole 94a to which the tip 12b of the shaft portion 12 is coupled. The coupling hole 94a has the same diameter as that of the coupling hole 94a and continues to the inner diameter direction of the receiving plate 91. A through hole 95 that is bent to the surface 92 side and penetrates to the pressure sensor mounting surface opening 92 a that opens to the pressure sensor mounting surface 92 is formed.

  Similar to the first and second embodiments, the wiring 32 of the pressure sensor 30 is inserted from the pressure sensor mounting surface opening 92a and is inserted into the grip portion 11 via the shaft portion 12, and the grip portion. 11 through the wiring hole 11d. In this state, the receiving plate 91 is fixed to the shaft portion 12, the shaft portion 12 is fixed on the same axis as the grip portion 11, and has a smaller diameter than the pressure sensor mounting surface 92 and the electrode contact surface 93 of the receiving plate 91. The pressure sensor 30 is fixed to a substantially central portion in the inner diameter direction of the pressure sensor mounting surface 92 in a mounting range Q set to have a small diameter with respect to the pressure sensor mounting surface 92. An annular contact range R3 is formed along the outer periphery of the mounting range Q set on the pressure sensor mounting surface 92, and the electrode contact surface 93 corresponds to the contact range R3 of the pressure sensor mounting surface 92. The contact range R3 is similarly formed. Thereby, the pressure detection tool 80 is comprised.

  Next, a case where the pressure applied by the fixed electrode 132 and the movable electrode 133 in the spot welding apparatus 130 is detected by the pressure detection tool 80 will be described with reference to FIG.

  First, similarly to the case shown in FIG. 3 of the first embodiment, the connecting plate 137 of the spot welding apparatus 130 is lowered to the fixed electrode 132 side by the cylinders 135 and 136 and positioned at the lowered position H1, and then added. The pressure detection tool 80 is inserted between the fixed electrode 132 and the movable electrode 133 above the connection plate 137. Then, as shown in FIG. 9A, the pressure sensor 30 provided on the pressure sensor mounting surface 92 is brought into contact with the fixed electrode 132, and the pressure sensor mounting surface 92 of the receiving plate 91 is brought into contact therewith. The control pressure unit 138d of the connecting plate 137 is brought into contact with the contact range R3. In this state, the movable electrode 133 is lowered and brought into contact with the substantially central portion of the electrode contact surface 93 in the inner diameter direction.

  As a result, the pressure application detection unit 90 is sandwiched and pressurized by the control pressurization unit 138d, the fixed side electrode 132, and the movable side electrode 133. Then, the pressure sensor 30 is pressed by the fixed electrode 132, and an electromotive force corresponding to the pressure is generated in the pressure sensor 30. This electromotive force is applied to a measuring device (not shown) via the wiring 32, and the applied pressure FL corresponding to the applied electromotive force is measured by the measuring device. Since the control pressure applied by the control pressure unit 138d of the connecting plate 137 provided in the control pressure unit 134 is applied to the pressure sensor mounting surface 92 of the receiving plate 91, it affects the detection of the pressure FL. There is nothing.

  On the other hand, when detecting the pressing force FU of the movable side electrode 133, as in the case of detecting the pressing force FL of the fixed side electrode 132, the connecting plate 137 is positioned at the lowered position H1, and the pressing force detecting tool 80 is connected. The pressure sensor 30 provided on the pressure sensor mounting surface 92 is movable as shown in FIG. 9B by being inserted between the fixed side electrode 132 and the movable side electrode 133 above the plate 137. Opposite the side electrode 133, the central portion in the inner diameter direction of the electrode contact surface 93 is brought into contact with the fixed side electrode 132, and the control plate 137 is added to the contact range R 3 of the electrode contact surface 93 of the receiving plate 91. The pressure part 138d is brought into contact. In this state, the movable electrode 133 is lowered and brought into contact with the pressure sensor 30.

  As a result, the pressure application detection unit 90 is sandwiched and pressurized by the control pressurization unit 138d, the fixed side electrode 132, and the movable side electrode 133. Then, the pressing force sensor 30 is pressed by the movable electrode 133, and an electromotive force corresponding to this pressing is generated in the pressing force sensor 30. This electromotive force is applied to a measurement device (not shown) via the wiring 32, and the applied pressure FU corresponding to the applied electromotive force is measured by the measurement device. Since the control pressure applied by the control pressure unit 138d of the connecting plate 137 provided in the control pressure unit 134 is applied to the electrode contact surface 93 of the receiving plate 91, it affects the detection of the pressure FU. There is no.

  According to the pressurizing force detection tool 80 having the above configuration, the pressurizing force FL by the fixed electrode 132 and the pressurizing force FU by the movable electrode 133 can be individually detected. Therefore, the first embodiment and the second embodiment can be detected. The pressurizing force FL and FU can be appropriately detected with a simple configuration with respect to the pressurizing force detecting tool of the form.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. In the first embodiment, the connecting plate 137 of the spot welding device 130 is positioned at the lowered position H1, and the control pressurizing unit 138d of the connecting plate 137 is in contact with the first pressure sensor mounting surface 22 of the receiving plate 21. Although the case where it abuts on R1 has been described, for example, as shown in FIG. 3, the connecting plate 137 is positioned at the ascending position H3, and the control pressure member 138c of the connecting plate 137 is attached to the second pressure sensor on the receiving plate 21. The applied pressures FL and FU may be detected so as to contact the contact range R1 of the surface 23.

  In each of the above embodiments, the case where the first welding electrode is the fixed electrode 132 and the second welding electrode is the movable electrode 133 has been described. However, the first welding electrode is the movable electrode 133 and the second welding electrode is fixed. The side electrode 132 may be used.

  In each of the above-described embodiments, the case where the applied pressures FL and FU are measured by the measuring device has been described. For example, the gripping unit 11 includes a measuring device and a display unit to measure and display the applied pressures FL and FU. You may comprise.

10, 40, 80 Force detection tool 11 Holding part 12 Shaft part 20, 50, 90 Pressure detection part 21, 51, 91 Receiving plate (base part)
22 First pressure sensor mounting surface (first surface)
23 Second pressure sensor mounting surface (second surface)
24 Side surfaces 30, 70 First pressure sensor 31, 71 Second pressure sensor 52 Projection forming surface (first surface)
53 Second pressure sensor mounting surface (second surface)
60 Protruding portion 61 Side surface 62 First pressure sensor mounting surface (protruding portion surface)
92 Pressure sensor mounting surface (first surface)
93 Electrode contact surface (second surface)
R1, R2, R3 Contact range O1, O2, Q Mounting range P Projection range

Claims (5)

A first welding electrode that abuts a member to be welded on which a plurality of plate members are superimposed, a control pressurizing portion that abuts the member to be welded adjacent to the first welding electrode, and the first welding electrode facing the first welding electrode. The spot to be welded is pressed by the second welding electrode in contact with the member to be welded, and is spot-welded by energization between the first welding electrode and the second welding electrode in the clamping pressure state. A pressure detection tool for detecting a pressure force of the first welding electrode and the second welding electrode of a welding apparatus,
A base portion having a contact range where the control pressurizing portion contacts from the first welding electrode side;
A first pressure sensor that is provided on the abutting range side of the base portion and detects a pressure force of the first welding electrode;
A second pressure sensor that is provided on the base portion with the base portion interposed between the first pressure sensor and detects a pressure force of the second welding electrode;
A pressurizing force detection tool comprising: The base portion is
Formed in a disk shape having a first surface substantially circular in plan view and a second surface facing the first surface;
The first pressure sensor is
The first surface is formed in a disk shape having a small diameter, and is provided in a mounting range that is set to a small diameter with respect to the first surface at a central portion in the inner diameter direction of the first surface.
The contact range is
Annularly formed on the first surface along the outer periphery of the attachment range of the first surface,
The pressure detection tool according to claim 1. A first welding electrode that abuts a member to be welded on which a plurality of plate members are superimposed, a control pressurizing portion that abuts the member to be welded adjacent to the first welding electrode, and the first welding electrode facing the first welding electrode. The spot to be welded is pressed by the second welding electrode in contact with the member to be welded, and is spot-welded by energization between the first welding electrode and the second welding electrode in the clamping pressure state. A pressure detection tool for detecting a pressure force of the first welding electrode and the second welding electrode of a welding apparatus,
A receiving plate formed in a disk shape having a first surface having a substantially circular shape in plan view and a second surface facing the first surface;
A cylindrical surface projecting in the axial direction from a projecting range set to a small diameter with respect to the first surface at the center portion in the inner diameter direction of the first surface of the receiving plate, and the projecting portion surface facing the first surface is an end A protruding part in the part,
An abutting range formed in an annular shape on the first surface along the outer periphery of the projecting range of the projecting portion, and the control pressurizing unit abutting from the first welding electrode side;
A first pressure sensor that is provided on the projection surface and detects the pressure of the first welding electrode;
A second pressure sensor provided on the second surface for detecting the pressure of the second welding electrode;
A pressurizing force detection tool comprising: A first welding electrode that abuts a member to be welded on which a plurality of plate members are superimposed, a control pressurizing portion that abuts the member to be welded adjacent to the first welding electrode, and the first welding electrode facing the first welding electrode. The spot to be welded is pressed by the second welding electrode in contact with the member to be welded, and is spot-welded by energization between the first welding electrode and the second welding electrode in the clamping pressure state. A pressure detection tool for detecting a pressure force of the first welding electrode and the second welding electrode of a welding apparatus,
A receiving plate having a first surface and a second surface facing the first surface, the control pressurizing unit being formed so as to be able to contact from the first welding electrode side;
A pressure sensor provided on the first surface of the receiving plate,
The pressure sensor is opposed to the first welding electrode, the control pressure member is brought into contact with the first surface of the receiving plate from the first welding electrode side, and the pressure sensor is pressed by the first welding electrode. And the second welding electrode is brought into contact with the second surface of the receiving plate and the pressure sensor is sandwiched and pressurized to detect the pressure of the first welding electrode,
The control pressure unit is brought into contact with the second surface of the receiving plate from the first welding electrode side with the pressure sensor facing the second welding electrode, and the first welding electrode is connected to the second welding electrode. The pressure sensor is clamped and pressed by pressing the pressure sensor with the second welding electrode and the pressure force of the second welding electrode is detected.
A pressure detection tool characterized by that. The pressure sensor, the first pressure sensor, and the second pressure sensor are:
The pressure detection tool according to claim 1, wherein the pressure detection tool is formed of a piezoelectric element.

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