JP2023085603A - Device and method for measuring electrode pressurizing force - Google Patents

Abstract

To accurately measure the pressurizing force when materials to be welded are clamped and pressurized by electrodes of a resistance welding machine.SOLUTION: A measuring device 20 includes: a load cell 36 for measuring a pressurizing force; a load cell pressurizer 37 for pressurizing the load cell 36; and a pair of block parts 34a, 34b in which the load cell 36 is arranged in one part whereas the load cell pressurizer 37 is arranged in the other part, and which are arranged spaced away from each other in a state that the load cell 36 and the load cell pressurizer 37 abut on each other. In addition, the measuring device 20 includes an LM guide for guiding the pair of block parts 34a, 34b in a mutually approachable and separable manner, and in a freely slidable manner in a linear direction. The pair of block parts 34a, 34b include a pair of pressurizing parts 35 that are clamped and pressurized in a sliding direction by electrodes 15a, 15b of a resistance welding machine to a position off-set to an opposite side of the LM guide relative to the load cell 36.SELECTED DRAWING: Figure 4

Description

The present invention relates to an electrode pressurizing force measuring apparatus and an electrode pressurizing force measuring method for measuring in advance the pressurizing force of electrodes in order to sandwich and pressurize a metal material to be welded by opposing electrodes with an appropriate force.

A resistance welder presses a material to be welded, such as a metal, between opposing electrodes with an appropriate force, and joins the material to be welded by resistance heat generated by conducting an electric current. In order to check the state of this resistance welder, it is necessary to measure the pressure applied when the material to be welded is sandwiched between the electrodes (also called the electrode pressure), the welding current that flows between the electrodes, and the current application time. be. Welding current and welding time are measured by passing electrodes through the annulus of the toroidal coil. The applied pressure is measured by a conventional electrode applied pressure measuring device (also referred to as measuring device) 10 shown in FIG.

The measurement device 10 has a rod-shaped flexible pipe 12 fixed to the end face of a rubber grip portion 11 that is gripped by a person so as to protrude, and a load cell 13 is fixed to the tip of the flexible pipe 12 via a rod 12a. The load cell 13 has a disc shape, and has recesses 13a and 13b (FIG. 6) that are generally conical in the center of the circular surfaces on both sides of the disc. A person holding the rubber grip portion 11 performs alignment so that the depressions 13a and 13b on both sides are sandwiched from both sides (upper and lower sides in this case) by the opposing electrodes 15a and 15b (FIG. 7). After that, the pressure applied by the electrodes 15a and 15b is measured as follows.

That is, as shown in FIG. 7, a person holds the load cell 13 so that the recess 13b of the load cell 13 is positioned above the lower electrode 15b, and the upper electrode 15a moves in an arc as shown by the curve A1 to move the load cell 13. By applying pressure, the load cell 13 measures the pressure. As a technique of this kind, there is one described in Patent Document 1.

JP-A-11-291060

The pressure applied by the electrodes 15a and 15b cannot be accurately measured by the measuring device 10 described above unless the electrodes 15a and 15b are properly aligned with the depressions 13a and 13b of the load cell 13 and applied. In other words, if the measuring device 10 is held by a person, the electrodes 15a and 15b can be properly fitted into the depressions 13a and 13b and the load cell 13 can be appropriately pressurized by the person making appropriate adjustments.

However, when a person holds the measuring device 10, the frequency of measurement drops significantly (for example, once every few months). In order to increase the frequency of measurement, it is conceivable to fix the measurement device 10 to a support stand or the like instead of holding it by a person and automatically measure it by a control device. Merely fixing the measuring device 10 described above to a support table cannot appropriately adjust the orientation of the load cell 13 during pressurization, and the measurement accuracy decreases (cannot be guaranteed). If the pressure applied by the electrodes 15a and 15b is not appropriate, the welding product such as the sheet metal of an automobile, which is the material to be welded, will be peeled off.

The present invention has been made in view of such circumstances, and an electrode pressure measuring device and an electrode pressure measuring device capable of accurately measuring the pressure when a material to be welded is pressed between electrodes of a resistance welder. The purpose is to provide a method.

As a means for solving the above-mentioned problems, the electrode pressure measuring apparatus of the present invention includes a load cell for measuring the pressure, a load cell pressure unit for applying pressure to the load cell, and the load cell being installed on one side and the pressure on the other side. a pair of block portions in which the load cell pressurizing portion is arranged and which are arranged apart from each other while the load cell and the load cell pressurizing portion are in contact with each other; and and a guide portion that guides the load cell so as to be slidable in a linear direction, and the pair of block portions are offset from the load cell on the opposite side of the guide portion in a sliding direction with electrodes of a resistance welder. It is characterized by comprising a pair of pressurized parts sandwiched between and pressurized.

ADVANTAGE OF THE INVENTION According to this invention, the pressurizing force at the time of clamping|pressing a to-be-welded material with the electrode of a resistance welding machine can be measured correctly.

1 is a perspective view showing the configuration of an electrode pressing force measuring device according to an embodiment of the present invention; FIG. FIG. 2 is an enlarged perspective view of the electrode pressing force measuring device shown in FIG. 1; FIG. 2 is a cross-sectional view taken along line III-III of the electrode pressing force measuring device shown in FIG. 1; FIG. 4 is a cross-sectional view showing a state in which the pressurizing part of the electrode pressurizing force measuring device shown in FIG. 3 is pressurized by electrodes from above and below; FIG. 10 is a plan view of a conventional electrode pressing force measuring device; It is a side view of the conventional electrode pressing force measuring device. FIG. 10 is a side view showing a state in which a load cell of a conventional electrode pressurizing force measuring device is pressurized by electrodes from above and below;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Configuration of Embodiment>
FIG. 1 is a perspective view showing the configuration of an electrode pressure measuring device according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the electrode pressure measuring device shown in FIG.

The electrode pressurizing force measuring device (measuring device) 20 shown in FIG. It is to measure. This measuring device 20 is fixed to the upper part of a rectangular pole 21 erected on a horizontal floor in a direction perpendicular to the floor (hereinafter simply referred to as a vertical direction). An annular toroidal coil 23 for measuring current [A: Ampere] is arranged on the upper part of the square pole 21 beside the measuring device 20, and is fixed with an insulock or the like. The lower end of the square column 21 is fixed to a square plate 22, and the plate 22 is fixed to the floor with a plurality of bolts (not shown).

On the back side of the fixed surface of the measuring device 20 in the square column 21, the pressure by the electrode measured by the load cell 36 (FIG. 3) described later, the welding current flowing between the electrodes measured by the toroidal coil 23, and the current A processing device 24 is fixed to perform interface processing and the like for transmitting measurement results such as the energization time to a robot (not shown).

The toroidal coil 23 measures the welding current flowing between a pair of electrodes 15a and 15b (see FIG. 4) of a resistance welder (not shown) and the current application time. This measurement is performed by inserting the electrodes 15a and 15b into the ring of the toroidal coil 23. As shown in FIG.

FIG. 3 shows a cross-sectional view taken along line III-III in a direction perpendicular to the floor on which the measuring device 20 shown in FIG. 1 is erected. As shown in the cross-sectional view of FIG. LM blocks (registered trademark) 32 a 1 and 32 b 1 each having an elongated rectangular cross section are slidably combined with the rail 32 . Base end portions 34a1 and 34b1 (described later) of a triangular combination block portion 34 are fixed to the LM blocks 32a1 and 32b1 with screws or the like, and the combination block portion 34 slides together with the LM blocks 32a1 and 32b1. This sliding direction coincides with the vertical direction (also referred to as the vertical direction) in this example. In addition, the LM guide constitutes a guide portion described in the claims.

The plate 31 has an elongated rectangular shape slightly narrower than one side surface of the quadrangular prism 21, and is provided with a plurality of screw holes 31a along the longitudinal direction. The rail 32 is provided with screw insertion holes 32a extending through the rail 32 at positions corresponding to the respective screw holes 31a along the longitudinal direction. The screw insertion hole 32a is formed by connecting a large diameter insertion hole through which the head of the screw 33 can be inserted and a small diameter insertion hole through which only the screw portion of the screw 33 can be inserted. As a result, the head of the screw 33 inserted from the large-diameter insertion hole of the screw insertion hole 32a stops at the boundary position of the connection.

The rail 32 is arranged on the plate 31 in such a manner that each screw insertion hole 32a communicates with each screw hole 31a. 32 is fixed to plate 31 .

The combined block portion 34 is formed of a strong member such as iron that is difficult to deform, and is configured by combining an upper block portion 34a having a right-angled triangular cross-sectional shape and a lower block portion 34b having substantially the same shape. . On one side forming a right angle of the upper block portion 34a, a base end portion 34a1 having an elongated rectangular cross section is provided. . Similarly, on one side forming a right angle of the lower block portion 34b, a base end portion 34b1 having an elongated rectangular cross section is provided, and the base end portion 34b1 is fixed to an LM block 32b1 that freely slides on the rail 32. It is The opposing surfaces 34a2 and 34b2 forming right angles of the upper block portion 34a and the lower block portion 34b are close to each other with a gap G1 interposed therebetween. The upper block portion 34a and the lower block portion 34b are also referred to as block portions 34a and 34b. Also, the upper block portion 34a and the lower block portion 34b constitute a pair of block portions described in the claims.

The inclined surfaces 34a3 and 34b3 between the two surfaces forming a right angle for each of the block portions 34a and 34b form a substantially isosceles triangle in cross section with the base end portions 34a1 and 34b1 as bottom surfaces. A pressure unit 35, which will be described later, is provided on the top of the isosceles triangle on the side opposite to the rail 32 side. The measuring device 20 is covered with a cover 25 (see FIG. 1) so that the isosceles triangular combination block portion 34 horizontally protrudes from the side surface of the quadrangular prism 21 .

As shown in the perspective view of FIG. 2, the upper block portion 34a includes a plate-shaped right-angled triangular portion 34a4 that protrudes laterally from the square column 21, and a rectangular parallelepiped portion that protrudes laterally with an inclined surface 34a3 at the tip end. 34a5. The upper surface of the rectangular parallelepiped portion 34a5 is a horizontal plane wider than the width of the right-angled triangular portion 34a4, and the right-angled triangular portion 34a4 is integrally fixed to the center of the horizontal plane in the width direction. The tip portion of the rectangular parallelepiped portion 34a5 having the inclined surface 34a3 is provided with a recessed hollowed portion 34a6, and an electrode presser 35a, which will be described later, is fitted in a through hole in the planar portion of the hollowed portion 34a6. Slanted surfaces 34a3 are provided on both sides of the hollowed portion 34a6 to increase the strength of the upper block portion 34a.

The lower block portion 34b has a symmetrical shape with the upper block portion 34a, and has a gap G1 between the block portions 34a and 34b. The lower block portion 34b includes a plate-shaped right-angled triangular portion 34b4 laterally protruding from the square column 21, and a rectangular parallelepiped portion 34b5 laterally protruding with an inclined surface 34b3 at the tip. A right triangle portion 34b is integrally fixed under the horizontal plane of the rectangular parallelepiped portion 34b5. An electrode presser 35b (see FIG. 3) is fitted in a through-hole in a planar portion of a hollowed portion 34b6 formed in an inclined surface 34b3 of a rectangular parallelepiped portion 34b5.

A pressurized portion 35 shown in FIG. 3 is a portion sandwiched between a pair of electrodes 15a and 15b (FIG. 4) of a resistance welder and pressurized with a predetermined pressurizing force. The pressurizing portion 35 is constructed by inserting two bolt-shaped electrode pressurizers 35a and 35b into through-holes provided in the upper and lower block portions 34a and 34b in the vertical direction and fitting and fixing them. . The electrode pressers 35a and 35b are arranged such that their tips are opposed to each other with a predetermined gap G1 therebetween. The end surfaces of the heads of the electrode pressers 35a and 35b are flat. This flat end face is called a flat end face. In addition, the pressurizing portion 35 constitutes a pressurized portion described in the claims.

A load cell 36 is fitted in a concave portion formed at a position (offset position) spaced from the pressurizing portion 35 toward the base end portion 34b1 by a predetermined length on the facing surface 34b2 of the lower block portion 34b. ing. A bolt-shaped load cell pressurizer 37 for pressurizing the load cell 36 is arranged (or arranged) on the facing surface 34a2 of the upper block portion 34a. The load cell pressurizer 37 is separate (detachable) from the upper block 34a, but may be integrated with the upper block 34a.

In addition, the load cell pressurizer 37 constitutes a load cell pressurizing section described in the claims. The portions of the block portions 34a and 34b where the load cells 36 and the load cell pressurizers 37 are arranged constitute the body portions of the block portions described in the claims. The corners defined by the hollowed portions 34a6 and 34b6 between the body portion and the pressurizing portion 35 have the first reinforcing walls described in the claims. In addition, base end portions 34a1 and 34b1 extending along the LM guide (rail 32) from the surface of each block portion 34a and 34b opposite to the opposing surface having the gap G1 serve as the second reinforcing wall described in the claims. Configure.

The load cell 36 measures the applied force, and as shown in FIG. 4, the pressure surface is raised in a curved convex shape, and this curved convex surface protrudes slightly upward from the facing surface 34b2 of the lower block portion 34b. ing. The protruding curved convex surface and the circumferential surface (or side surface) of the load cell 36 are inserted into a large-diameter concave portion formed in the facing surface 34a2 of the upper block portion 34a with a gap so as not to come into contact with the side wall of the concave portion. It is A small-diameter recess into which the load cell pressurizer 37 is fitted is formed in the central portion of the large-diameter recess.

The end surface of the head of the load cell pressurizer 37 is a horizontal surface, and is in contact with the top (or center) of the curved convex surface of the load cell 36 . Due to this contact, a gap G1 of a predetermined size is formed between the lower block portion 34b and the upper block portion 34a. However, the pressure surface of the load cell 36 may be a horizontal surface, and the head end surface of the load cell pressurizer 37 may be a curved convex surface.

As described above, the load cell pressurizer 37 abuts on the load cell 36, and the upper and lower electrode pressurizers 35a and 35b of the pressurizing section 35 are arranged on the upper and lower block sections 34a and 34b with the gap G1 interposed therebetween. Therefore, when the electrode pressers 35a and 35b are sandwiched between the upper and lower electrodes 15a and 15b and pressure is applied in the opposing direction, the upper and lower block portions 34a and 34b move in the opposing direction while vertically narrowing the gap G1. Since the load cell pressurizer 37 presses the load cell 36 in accordance with this movement, the load cell 36 measures the pressure applied by the electrodes 15a and 15b. However, the pressure applied by the electrodes 15a and 15b is a pressure preset by the robot.

The lower electrode 15b (fixed electrode 15b) supports the flat end surface of the lower electrode presser 35b from below and can be fixed at any position. Normally, a robot lifts the fixed electrode 15b away from the plunger portion 39 and fixes it, and the pressure is measured. The upper electrode 15a (moving electrode 15a) moves in an arc in the vertical direction as indicated by a curve A1, and presses the upper electrode presser 35a downward to press with the lower fixed electrode 15b. Pressurize with the pressure part 35 interposed therebetween.

Further, when the electrodes 15a and 15b are worn, the robot lifts the fixed electrode 15b by the worn dimension and fixes it, thereby preventing vertical positional displacement of the pressure measuring unit, which will be described later, due to wear of the electrodes. This makes it possible to measure without worrying about the amount of wear of the electrodes 15a and 15b. The pressing force measuring portion is upper and lower block portions 34 a and 34 b as a moving mechanism of the combination block portion 34 including the pressing portion 35 , the load cell 36 and the load cell pressurizer 37 .

The distance between the flat end surfaces of the upper and lower electrode pressers 35a and 35b (the distance between the flat end surfaces of the pressing portion 35) is the distance between the end surfaces of the upper and lower base ends 34a1 and 34b1 (or the pair of block portions 34a and 34b). 34b in the sliding direction on the load cell 36 side). In other words, the distance between the flat end surfaces of the pressing portion 35 on the tip end side of the combined block portion 34 is made as short as possible under the condition that the strength to prevent breakage when pressed by the moving electrode 15a moving in an arc can be maintained. In addition, the distance between the end faces of the base ends 34a1 and 34b1 of the combination block portion 34 on the rail 32 side is made as long as possible in order to prevent the combination block portion 34 from bending when receiving the moment when the moving electrode 15a pressurizes. I have If the distance between the upper and lower ends is short, the combined block portion 34 will bend due to the moment force.

When the moving electrode 15a moving in an arc and the fixed electrode 15b pressurize while sandwiching the pressing portion 35, the longer the dimension between the flat end faces of the pressing portion 35, the more oblique direction the moving electrode 15a moves in the arc shape with respect to the flat end face. force acts greatly. As a result, the horizontal force of the movable electrode 15a is applied to the flat end surface, and the vertical (longitudinal) force between the movable electrode 15a and the fixed electrode 15b is weakened accordingly. Therefore, in the present invention, the distance between the flat end surfaces of the pressure member 35 is shortened as much as possible, so that the direction of the force sandwiched between the flat end surfaces of the pressure member 35 by the electrodes 15a and 15b approaches the vertical direction. Made it stronger.

As shown in FIG. 4, the moving electrode 15a moving in an arc may contact and press the edge of the flat end surface of the electrode presser 35a. In this case, since the vertical (longitudinal) flat end faces of the electrode pressers 35a and 35b are extremely short, the moving electrode 15a moves the flat end face of the electrode presser 35a to the rail 32 side very slightly. It only moves. Since the lateral force of the moving electrode 15a is relieved according to this lateral movement, only the force applied by the electrodes 15a and 15b in the vertical direction is applied to the load cell 36 via the load cell pressurizer 37. FIG. In other words, the force of laterally moving the flat end surface of the pressing portion 35 of the moving electrode 15a is not transmitted to the load cell 36, and the pressure applied between the fixed electrode 15b and the fixed electrode 15b is properly transmitted to the load cell 36.

The flat end surface of the electrode presser 35a with which the moving electrode 15a abuts has an area that allows contact even if the moving electrode 15a moving in an arc is displaced from the proper position, and is large enough to allow the moving electrode 15a to escape laterally during pressurization. It is the area of . If the radius of the arc movement is small, the moving electrode 15a moves more obliquely, so it is necessary to increase the area of the flat end face of the electrode presser 35a. On the other hand, if the radius of the arc movement is large, the moving electrode 15a moves in a direction nearly perpendicular to the flat end surface of the electrode presser 35a. As a result, the length by which the moving electrode 15a escapes on the flat end face in the lateral direction is shortened, so that the area of the flat end face can be reduced accordingly.

In addition, even when the upper and lower electrodes of the resistance welder move vertically, the arms of the resistance welder to which the electrodes are fixed flex during pressurization and move the flat end faces of the electrode presser 35a or 35b laterally. move very slightly to Therefore, the flat end face of the electrode presser 35a or the electrode presser 35b needs to have an area for escaping the lateral movement.

The electrode pressers 35a and 35b and the load cell presser 37 are replaceable, and can be replaced when the flat end faces of the electrode pressers 35a and 35b are damaged or deformed.

As shown in FIG. 3, a plunger portion 39 (see FIG. 2) is fixed to the side surface of the square pole 21 below the rail 32 via a metal L-shaped member 38 screw-fixed to the side surface. ing. The plunger portion 39 has a convex shape extending upward by a built-in spring, and the lower end side 34b7 of the base end portion 34b1 of the combination block portion 34 is placed on the convex shape. The plunger portion 39 does not change due to the weight of the combined block portion 34, and when a downward force is applied to the combined block portion 34, the spring contracts and can absorb the force. By absorbing this force, deformation and breakage of the combined block portion 34 can be prevented.

<Effects of Embodiment>
As described above, the characteristic configuration of the electrode pressing force measuring device 20 of the present embodiment will be described in the following (1) to (6).

(1) The measuring device 20 includes a load cell 36 for measuring the applied force, a load cell pressurizer 37 for pressurizing the load cell 36 (corresponding to the load cell pressurizing unit described in the claims), and the load cell 36 is installed on one side and the other A load cell pressurizer 37 is arranged in the , and a pair of block portions 34a and 34b are arranged apart from each other while the load cell 36 and the load cell pressurizer 37 are in contact with each other. Furthermore, the measuring device 20 includes an LM guide that guides the pair of block portions 34a and 34b so that they can approach and separate from each other and slidably in the linear direction. A pair of pressurizing portions 35 (a pressurized portion described in the applicable).

According to this configuration, when the load cell 36 and the load cell pressurizer 37 are in contact with each other and the pair of block portions 34a and 34b are separated from each other, the pressure member 35 is sandwiched between the electrodes 15a and 15b and pressurized. Since the block portions 34 a and 34 b move in the direction of pressing each other, the load cell 36 is pressurized by the load cell pressurizer 37 . Therefore, the load cell 36 can accurately measure the pressure applied by the electrodes 15a and 15b.

(2) The length of the pressurizing portion 35 in the block portions 34a and 34b in the pressurizing direction is shorter than the length of the load cell 36 in the sliding direction.

According to this configuration, when the pressure member 35 is sandwiched between the electrodes 15a and 15b moving in a circular arc shape, the shorter the length in the pressure direction, which is the same as the sliding direction of the pressure member 35, The electrodes 15a and 15b apply pressure while sandwiching the surface of the pressure member 35 substantially in the sliding direction, as compared with the case where the length is long. Therefore, when the pressure portion 35 is long, the pressure portions of the electrodes 15a and 15b are larger than when the electrodes 15a and 15b sandwich the surface of the pressure portion 35 in an oblique direction shifted by a predetermined angle from the sliding direction (vertical direction). Lateral forces along the plane of 35 are reduced. As a result, the force applied to the load cell 36 in the sliding direction can be applied without escaping, so that the load cell 36 can accurately measure the pressure applied by the electrodes 15a and 15b. In the pair of block portions 34a and 34b, since the length of the load cell 36 side in the sliding direction is longer than the length of the pressurizing portion 35, the block portion 34a is moved by the moment force corresponding to the pressurization by the electrodes 15a and 15b. , 34b can be prevented from bending.

(3) The pressing portion 35 is configured such that the surface pressed by the electrodes 15a and 15b is a plane perpendicular to the sliding direction.

According to this configuration, when the plane of the pressurizing portion 35 is pressed by the electrode 15a that moves in an arc shape, the electrode 15a is laterally displaced along the plane even if the plane is obliquely sandwiched between the electrodes 15a and 15b. Therefore, since the force pressing the flat surface in the sliding direction (vertical direction) does not escape, the pressure applied by the electrodes 15a and 15b can be transmitted to the load cell 36 without escaping. Therefore, the load cell 36 can accurately measure the pressure applied by the electrodes 15a and 15b.

(4) The load cell 36 and the load cell pressurizer 37 each have contact surfaces that contact each other, one contact surface being a curved convex surface and the other contact surface being a flat surface.

According to this configuration, for example, the flat surface of the load cell pressurizer 37 can be brought into contact with the top of the curved convex surface of the load cell 36 and pressurized. Can pressurize.

(5) Each of the block portions 34a and 34b has a body portion on which either one of the load cell 36 and the load cell pressurizer 37 is installed on the opposing surfaces facing each other, and extends from the body portion in the direction opposite to the LM guide, A pressurizing portion 35 formed to have a smaller thickness dimension in the sliding direction than the main body portion, a first reinforcing wall provided at a corner portion between the main body portion and the pressurizing portion 35, and a side opposite to the facing surface. and a second reinforcing wall extending from the surface along the LM guide.

According to this configuration, since the block portions 34a and 34b are strengthened by the first reinforcing wall and the second reinforcing wall, the block portions 34a and 34b are less likely to bend due to the pressure applied by the electrodes 15a and 15b. Therefore, the pressure applied by the electrodes 15a and 15b can be transmitted to the load cell 36 without being lost, so that the pressure can be accurately measured.

(6) The LM guide is provided with a plunger portion 39 that expands and contracts in the sliding direction by a spring force and on which the block portions 34a and 34b are placed.

According to this configuration, when the blocks 34a and 34b are separated from the plunger portion 39 and lifted, the blocks 34a and 34b may fall for some reason, or the blocks 34a and 34b may be placed on the plunger portion 39. When a downward force is applied in this state, the plunger portion 39 extended by the spring force is contracted to absorb the downward force. Therefore, damage to the measuring device 20 can be prevented.

By using such a measuring device 20, it is possible to realize the electrode pressing force measuring method described in (7) to (9) below.

(7) A resistance welder (not shown) having a pair of electrodes 15a and 15b, a robot (not shown) capable of moving the resistance welder, a controller (not shown) for controlling the robot, and Using the measuring device 20 according to any one of (1) to (6), the following electrode pressing force measuring method is performed. An installation step of installing the measuring device 20 with the sliding direction in the vertical direction within the movement range of the resistance welder by the robot, a recording step of recording the position information of the measuring device 20 in the control device, and a control device to the position information. By controlling the robot based on the above, a pressurizing step of sandwiching and pressurizing the pressurizing portion 35 between the pair of electrodes 15a and 15b and a measuring step of measuring the pressurizing force by the load cell 36 are executed.

According to this method, the measuring device 20 is installed so that the sliding direction is the vertical direction, the robot is controlled by the control device, and the pair of electrodes 15a and 15b of the resistance welding machine properly press the pressure part 35 of the measuring device 20. Since it can be gripped and applied, the applied force can be accurately measured by the load cell 36 .

(8) At least one of the pair of electrodes 15a and 15b presses the pressurizing portion 35 while drawing an arc-shaped trajectory.

According to this method, even if at least one of the pair of electrodes 15a and 15b of the resistance welder presses the pressing portion 35 while drawing an arc-shaped trajectory, the pair of electrodes 15a and 15b can be applied. The pressing portion 35 can be properly gripped and pressurized.

(9) In the pressurizing step, the electrode 15b arranged on the lower side of the pair of electrodes 15a and 15b is used to pressurize the pressurizing portion 35 while lifting the pair of block portions 34a and 34b.

According to this method, it is possible to correct the displacement of the pressure member 35 in the sliding direction due to wear of the electrodes 15a and 15b.

In addition, the specific configuration can be changed as appropriate without departing from the gist of the present invention. The electrode pressurizing force measuring apparatus 20 described above can also be applied to a resistance welder having a structure in which the upper and lower electrodes are vertically moved relative to each other by a robot or the like.

15a electrode (moving electrode)
15b electrode (fixed electrode)
20 Electrode pressure measuring device 23 Toroidal coil 32 LM guide rails 32a1, 32b1 LM block 34 Combination block part 34a Upper block part 34b Lower block part 34a1, 34b1 Base ends of upper and lower block parts 34a2, 34b2 Opposite surfaces of upper and lower block parts 34a3, 34b3 Inclined surface of upper and lower block parts 34a4, 34b4 Right triangle part of upper and lower block parts 34a5, 34b5 Rectangular parallelepiped part of upper and lower block parts 34a6, 34b6 Hollow part of upper and lower block parts 35 Pressure part 35a, 35b Electrode pressure element 36 Load cell 37 load cell pressurizer 39 plunger part G1 gap

Claims (9)

a load cell for measuring the applied force;
a load cell pressurizing unit that pressurizes the load cell;
a pair of block portions, one of which is provided with the load cell and the other of which is provided with the load cell pressurizing portion, and which are arranged apart from each other while the load cell and the load cell pressurizing portion are in contact with each other;
a guide part that guides the pair of block parts so that they can be moved closer to each other and slidably in a linear direction;
The pair of block portions includes a pair of pressurized portions that are sandwiched in the sliding direction by electrodes of a resistance welder and pressurized at positions offset from the load cell on the opposite side of the guide portion. An electrode pressure measuring device characterized by: The electrode pressure measuring device according to claim 1, wherein the length of the pressurized portion in the block portion in the pressurizing direction is shorter than the length of the load cell in the sliding direction. . 3. The electrode pressing force measuring apparatus according to claim 1, wherein the pressurized portion has a plane that is perpendicular to the sliding direction on a surface pressurized by the electrode. The load cell and the load cell pressurizing unit each include a contact surface that contacts each other,
4. The electrode pressure measuring device according to claim 1, wherein one of the contact surfaces is a curved convex surface and the other contact surface is a flat surface. Each of said block portions includes:
a main body portion in which either one of the load cell and the load cell pressurizing portion is installed on opposing surfaces facing each other;
the pressurized portion extending from the body portion in a direction opposite to the guide portion and having a smaller thickness dimension in the sliding direction than the body portion;
a first reinforcing wall provided at a corner between the body portion and the pressurized portion;
and a second reinforcing wall extending along the guide portion from a surface on the opposite side of the facing surface. The electrode pressurizing force according to any one of claims 1 to 5, wherein the guide portion includes a plunger portion that expands and contracts in the sliding direction by a spring force and on which the block portion is placed. measuring device. a resistance welder with a pair of electrodes;
a robot capable of moving the resistance welder;
a control device that controls the robot;
The electrode pressure measuring device according to any one of claims 1 to 6;
An electrode pressure measurement method using
an installation step of installing the electrode pressure measuring device with the sliding direction as the vertical direction within the movement range of the resistance welder by the robot;
a recording step of recording the position information of the electrode pressure measuring device in the control device;
a pressurizing step in which the pair of electrodes sandwiches and pressurizes the pressurized portion by the control device controlling the robot based on the position information;
a measuring step of measuring the applied pressure with the load cell;
A method for measuring electrode pressure, characterized by performing The electrode pressurizing force measuring method according to claim 7, wherein at least one of the pair of electrodes presses the pressurized portion while drawing an arc-shaped trajectory. 9. The pressurizing step according to claim 7, wherein in the pressurizing step, the lower electrode of the pair of electrodes presses the pressurized portion while lifting the pair of block portions. electrode pressure measurement method.

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