JP2010036227A - Electrode shaping apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode shaping apparatus that can quickly shape, without taking time and labor, a disk-like electrode wheel installed in a seam welder and that can efficiently and accurately shape the electrode wheel. <P>SOLUTION: The apparatus includes a cutting tool 2 for cutting the chip end in the outer circumference of an electrode wheel W after welding, a rotary drive means 23 for rotating the cutting tool 2, a forward/backward moving means 12 for giving to-and-fro movement to the cutting tool in the direction coming in contact with the electrode wheel W. The cutting tool 2 is equipped with a recess that is formed along the periphery in correspondence with the chip end shape of the electrode wheel W, a plurality of notched parts that intersect the recess and are notched deeper than the recess and released on both sides of the cutting tool, and cutting blades formed in the edge of the recess defined by each notched part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrode shaping device for shaping a disk-shaped electrode ring provided in a seam welder.

  For example, as can be seen in Patent Document 1 below, it is known that the upper half and the lower half of a motorcycle fuel tank formed of a metal plate are joined using a seam welder. This type of seam welding machine includes a pair of rotating electrode wheels, and sandwiches the polymerized metal plates between both electrode wheels and rotates them while applying pressure to perform electric welding to join the metal plates. The electrode ring is attached to the electrode surface and is damaged with the welding operation, or the surface is fatigued due to the applied pressure. For this reason, the operation | work which scrapes off the outer periphery front end used as the electrode surface of an electrode ring, and shapes it smoothly is performed.

  Conventionally, as shown in Patent Document 2 below, as a device for shaping an electrode wheel, a rotating grindstone is incorporated into a seam welder, and the rotating grindstone is pressed against the electrode wheel during a waiting time after seam welding or during seam welding. The one that can shape the electrode ring is known.

  However, according to the configuration of Patent Document 2, not only a space for incorporating a rotating grindstone into a seam welder is required, but also a narrow portion that curves like the above-described fuel tank for a motorcycle (for example, a fuel tank that covers a frame of a motorcycle) In a seam welding machine that welds along the electrode wheel in the recess), if a rotating grindstone is provided in the vicinity of the electrode wheel, the fuel tank for the motorcycle and the rotating grindstone interfere with each other. For this reason, in the case of a seam welder that welds a workpiece with a narrow welded part, such as a fuel tank for a motorcycle, the electrode wheel is shaped with a hand tool, or removed from the seam welder and placed at another position. It takes a lot of work because it has to be shaped.

In addition, when the electrode wheel is ground with a grinding tool including a grindstone or knurl, the grinding tool is likely to be clogged with grinding scraps, and the shaping accuracy of the electrode wheel is reduced in a short time. For this reason, it is necessary to frequently replace and clean the grinding tool, which disadvantageously reduces the efficiency of the shaping work.
JP-A-60-112080 JP 2000-61651 A

  In view of the above points, the present invention can quickly shape a disk-shaped electrode ring provided in a seam welder without trouble, and can efficiently shape an electrode ring with high accuracy. It is an object to provide an electrode shaping device.

  In order to solve the above problems, the present invention provides an electrode shaping apparatus for shaping a disk-shaped electrode ring provided in a seam welding machine, and a disk-shaped cutting tool for cutting the tip of the electrode ring after welding; Rotation drive means for rotating the cutting tool in the circumferential direction; and advancing / retreating means for moving the cutting tool back and forth in a direction in contact with the electrode wheel of the seam welder, the cutting tool being provided along a peripheral edge thereof. A recess corresponding to the shape of the tip of the electrode wheel, a plurality of notches that intersect with the recess and are cut deeper than the recess and open on both sides of the cutting tool, and each notch And a cutting blade formed on an edge of the recess.

  According to the present invention, the cutting tool can be retracted to a position where it does not interfere with the workpiece being welded by the electrode wheel of the seam welding machine by retracting the cutting tool by the advance / retreat means. After the work is finished and the workpiece is taken out, the cutting tool can be advanced by the advance / retreat means to cut the tip of the electrode wheel, so that the electrode wheel can be quickly shaped without removing the electrode wheel from the seam welder. It can be carried out. Further, since the cutting tool cuts the tip of the electrode wheel with the cutting blade portion, the shaping time is short and clogging does not occur as compared with the case where a knurling or a grindstone is used. Further, the cut portion can surely discharge the cutting waste from the inside of the recess, thereby extending the life of the cutting tool and reducing the work for exchanging the cutting tool.

  In the present invention, the notch of the cutting tool may be formed by a through-hole that intersects the recess and penetrates the cutting tool in both directions, and the slit is formed by cutting the recess from the peripheral edge thereof. It may be formed in a shape. According to this, a cutting blade part can be provided only by forming a through-hole and a slit, and manufacture of a cutting tool also becomes easy.

  In addition, the cutting tool includes a claw-like convex part in a side-view nail shape that protrudes to the peripheral part by the plurality of notches, and the claw-like convex part includes the concave part and the claw-like convex part. You may make it provide the said cutting blade part formed in the one end edge of a recessed part. According to this, since it becomes possible to make the space | interval of each nail | claw-shaped convex part comparatively wide, a cutting tool can be reduced in weight compared with the case where a notch part is formed in a through-hole or a slit shape.

  Further, in the cutting tool provided with such a claw-shaped convex portion, the concave portion is composed of a bottom portion and a pair of inner walls that are inclined so as to gradually expand facing the bottom portion. On the inner wall, a plurality of wavy surfaces in the radial direction are formed with a phase shifted for each claw-shaped convex portion, and the cutting blade portion includes a plurality of convex blades formed by edges of the wavy surface, The convex blade is preferably provided at a different position for each claw-shaped convex portion due to a phase shift of the wavy surface.

  When the tip of the electrode wheel enters the concave portion, the convex blade comes into contact with the electrode surface, the surface pressure is locally increased, and a high cutting force can be obtained. And since the convex blade is provided in the position which is different for every nail | claw-shaped convex part, the cutting resistance which generate | occur | produces on an electrode surface and a cutting blade part can be reduced. Thereby, the electrode wheel can be shaped smoothly and efficiently.

  Further, the electrode shaping device of the present invention is further provided in the advance / retreat means, the position where the cutting tool comes into contact with the tip of the electrode wheel by the advance of the advance / retreat means, and the target cutting amount of the electrode wheel And a control means for controlling the advance / retreat means so that the amount of contact of the cutting tool with the electrode wheel is equal to the target cutting amount detected by the contact sensor. To do.

  By providing the contact type sensor, it is possible to detect the position at which the cutting tool contacts the electrode wheel and the target cutting amount of the electrode wheel before the cutting tool contacts the electrode wheel. Since the amount of contact of the cutting tool with the electrode wheel can be adjusted so as to be the target cutting amount, the cutting accuracy of the electrode wheel can be improved.

  Further, the control means controls the advance / retreat means based on the contact position of the cutting tool with respect to the electrode wheel detected by the contact sensor, so that the cutting tool is moved to a position just before the cutting tool comes into contact with the electrode wheel. Advance at a predetermined speed of 1, and then increase the amount of contact of the cutting tool with the electrode wheel at a second predetermined speed lower than the first predetermined speed until the target cutting amount detected by the contact sensor is reached. Is preferred.

  By so doing, the first predetermined speed can be made relatively high, and the time until immediately before the cutting tool contacts the electrode wheel can be shortened. In addition, since the amount of contact of the cutting tool with the electrode wheel is increased by setting the second predetermined speed to a low speed, the electrode wheel is sharply cut, and vibrations generated at that time are prevented to perform highly accurate cutting. It can be carried out.

  In the present invention, it is preferable that the rotation driving means rotationally drives the cutting tool in a direction opposite to the rotation direction of the electrode wheel when the cutting tool shapes the electrode wheel. According to this, compared with the case where the cutting tool is rotated in the same direction as the electrode wheel and the electrode wheel is shaped, the amount of cutting of the electrode surface can be increased or decreased with high accuracy, and high-precision cutting work can be easily performed. This can be done advantageously.

  An embodiment of the present invention will be described with reference to the drawings. 1 is a plan view showing an electrode shaping apparatus of the present embodiment, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of a cutting tool, FIG. 4 is an explanatory view showing a cutting blade part of the cutting tool, and FIG. 6 is an explanatory view showing the position of the convex blade for each claw-like convex portion, FIG. 6 is an explanatory view showing the electrode wheel and the cutting tool during shaping work, FIG. 7 is a side view showing another cutting tool, and FIG. 9 is a plan view of the cutting tool 7, FIG. 9 is a side view showing another cutting tool, and FIG. 10 is a cross-sectional view of the main part of the cutting tool of FIG. 9.

  As shown in FIGS. 1 and 2, the electrode shaping device 1 of the present embodiment performs shaping of the outer peripheral tip that is the electrode surface of an electrode ring W provided in a seam welding machine (not shown). The electrode shaping device 1 includes a disk-shaped cutting tool 2 which will be described in detail, and the rotating cutting tool 2 is brought into contact with the rotating electrode wheel W to cut the outer peripheral tip of the electrode wheel W.

  First, the configuration of the electrode shaping device 1 will be described. As shown in FIGS. 1 and 2, the electrode shaping apparatus 1 according to the present embodiment includes an elevating base 5 that can be raised and lowered along a frame 4 erected on a machine base 3 (shown in FIG. 2). The elevating base 5 is slidably guided via a sliding member 7 by a rail 6 extending in the vertical direction on the frame 4. The raising / lowering of the raising / lowering base 5 is driven by the ball screw 9 rotated by the motor 8 (shown in FIG. 1) provided on the upper part of the machine base 3.

  A first slide base 10 is supported on the lift base 5. The first slide base 10 is slidably guided via a sliding member 12 by a rail 11 extending in the lateral direction on the elevating base 5. By the guide of the rail 11, the first slide base 10 can be moved in a direction approaching and moving away from the frame 4. The elevating base 5 is provided with a cylinder 13 for moving the first slide base 10 along the rail 11. The cylinder 13 extends the piston rod 14 to move the first slide base 10 toward the frame 4 and contracts the piston rod 14 to move the first slide base 10 away from the frame 4. Move.

  A second slide base 15 is supported on the first slide base 10. The second slide base 15 is guided through a sliding member 17 by a rail 16 provided on the first slide base 10. The rail 16 on the first slide base 10 extends in a direction perpendicular to the rail 11 on the lift base 5. By the guide of the rail 16, the second slide base 15 moves forward and backward with respect to the side where the electrode wheel W is present. The advance / retreat of the second slide base 15 is driven by a ball screw 18 provided on the first slide base 10. The ball screw 18 is connected to a rotating shaft of a motor 19 provided on the first slide base 10 via a gear box 20 and a pair of connecting gears 21 and 22. The second slide base 15, the ball screw 18, and the motor 19 constitute the advance / retreat means of the present invention.

  On the second slide base 15, the cutting tool 2, a motor 23, and a contact sensor 24 are provided. The cutting tool 2 is rotatably supported by a bearing 26 via a rotating shaft 25. The rotating shaft 25 includes a driven pulley 27, and the driven pulley 27 is connected to a driving pulley 28 included in the motor 23 via a belt 29. The motor 23, the drive pulley 28, and the driven pulley 27 constitute the rotational drive means of the present invention.

  The electrode shaping device 1 includes a control device (control means in the present invention) that is not shown. The control device is composed of a microcomputer or the like, stores predetermined information, and controls the motors 8, 19, 23 and the cylinder 13 by performing arithmetic processing.

  The contact-type sensor 24 contacts the tip of the electrode wheel W prior to the shaping operation of the electrode wheel W by the cutting tool 2, so that the position and the electrode where the cutting tool 2 contacts the electrode wheel W in cooperation with the control device. The target cutting amount of the wheel W is detected. Various signals from the contact sensor 24 are input to the control device, and the movement of the second slide base 15 is controlled when the electrode wheel W is cut based on the signals.

  When the contact sensor 24 is brought into contact with the tip of the electrode wheel W, the elevation base 5 is first moved up and down by driving the motor 8 so that the height positions of the contact sensor 24 and the electrode wheel W are matched. Next, the second slide base 15 is retracted to a predetermined position by driving the motor 19, and further, the second slide base 15 is moved away from the frame 4 by driving the cylinder 13, and the tip of the contact sensor 24 is moved to the tip of the electrode wheel W. (FIGS. 1 and 2 show a state in which the second slide base 15 moves forward and approaches the frame 4). With this position as a reference position (the reference position is a preset position), the tip of the contact sensor 24 is brought into contact with the tip of the electrode wheel W by the advancement of the second slide base 15.

  Due to this contact, the contact sensor 24 outputs a signal indicating the contact start point, and the control device stores the distance from the reference position to the contact start point. Furthermore, a signal indicating the state of the tip of the electrode wheel W (target cutting amount based on wear or coating metal formation) is obtained from the tip of the contact sensor 24 that moves after contacting the tip of the electrode wheel W. Based on this signal, The control device sets a target cutting amount of the electrode wheel W.

  Then, after obtaining information from the contact sensor 24, the control device controls the rotation of the motor 19 to temporarily retract the second slide base 15, and also controls the cylinder 13 to move the second slide base 15 to the frame 4. The cutting tool 2 and the electrode wheel W are opposed to each other at their tips. Next, based on the contact start point detected by the contact sensor 24, the control device immediately before the cutting tool 2 comes into contact with the electrode wheel W (in this embodiment, the interval between the cutting tool 2 and the electrode wheel W is The second slide base 15 is advanced at a high speed (first predetermined speed) until it reaches 0.005 mm. Subsequently, the control device starts the motor 23 to rotate the cutting tool 2 and moves the second slide base 15 at a low speed (first speed) until the target cutting amount set based on the detection by the contact sensor 24 is reached. The second predetermined speed is lower than the predetermined speed, and in this embodiment, the image is advanced at 0.01 mm / second). Thereby, the amount of contact of the cutting tool 2 with the electrode wheel W can be increased at a low speed, and extremely accurate cutting is performed.

  Thereafter, when the second slide base 15 has moved by a distance corresponding to the target cutting amount of the electrode wheel W, the control device retracts the second slide base 15 at a high speed. As described above, since the cutting tool 2 is moved at a high speed except when the cutting tool 2 is cutting the electrode wheel W, the time can be reduced and the electrode wheel W can be shaped extremely efficiently. . Further, at the end of shaping, the cutting tool 2 can be quickly moved away from the electrode wheel W, and welding work by a seam welding machine (not shown) can be started quickly.

  Next, the cutting tool 2 employed in the present embodiment will be described in detail. The cutting tool 2 is made of high-speed tool steel because of its high hardness and wear resistance. As shown in FIG. 3, the cutting tool 2 is substantially disc-shaped and has a plurality of intervals with a predetermined interval on its outer periphery. A claw-like convex part 31 having a claw-like shape in a side view is formed through the notch part 30 provided. The claw-shaped convex part 31 includes a concave part 32 extending in the circumferential direction, and the notch part 30 intersects the concave part 32 and is notched deeper than the concave part 32. Moreover, the notch part 30 is open | released by the both surfaces side of the cutting tool 2, and the cutting blade part 33 is formed in the end edge (one side wall of the nail | claw-shaped convex part 31) of the recessed part 32 by each notch part 30. FIG. Is formed. By making the cutting tool 2 in such a shape, the notch 30 can be made relatively large, and cutting waste can be discharged smoothly and reliably to the outside of the cutting tool 2 to prevent clogging and the like. In addition, the cutting tool 2 can be reduced in weight.

  As shown in FIG. 4, the concave portion 32 includes a bottom portion 34 and a pair of inner walls 35 that are inclined so as to expand from the bottom portion 34 gradually. Further, both inner walls 35 of the recess 32 have a plurality of undulating surfaces in the radial direction, and the cutting blade portion 33 has a plurality of protruding blades 36 formed by edges of the undulating surface. Accordingly, when the tip of the electrode wheel W enters the recess 32, the convex blade 36 comes into contact with the tip (electrode surface) of the electrode wheel W, so that the surface pressure is locally increased and a high cutting force is exhibited.

  The convex blade 36 of the cutting blade portion 33 is provided at a slightly different position for each claw-shaped convex portion 31. That is, the wavy surfaces of both inner walls 35 of the recess 32 are formed with a phase shifted for each claw-shaped projection 31, so that the projection blade 36 has a projection for each claw-shaped projection 31 as shown in FIG. 5. The position is different. In FIG. 5, the convex blades 36 of the three claw-shaped convex portions 31 are shown in comparison, but the positions of the convex blades 36 are different for all the claw-shaped convex portions 31. As a result, not only can the cutting resistance generated at the tip of the electrode wheel W and the cutting blade portion 33 be reduced, but also the blade contact position constantly changes according to the position of the convex blade 36 due to the rotation of the cutting tool 2. The cutting surface at the tip of W can be made smooth.

  Moreover, as shown in FIG. 6, the cutting tool 2 is rotationally driven in the direction opposite to the rotation direction of the electrode wheel W by the motor 23 (see FIG. 1). That is, when the electrode wheel W rotates counterclockwise, the cutting tool 2 rotates clockwise, and the cutting blade portion 33 of the cutting tool 2 is in the same direction as the tip of the electrode wheel W that contacts the cutting blade portion 33. The cutting is performed by so-called down-cutting. According to this, the cutting amount of the electrode wheel W can be increased / decreased more accurately than in the case of performing cutting by so-called up-cutting in which the cutting tool 2 is rotated in the same direction as the electrode wheel W. Work can be done easily.

  In addition, in the electrode shaping apparatus 1 of this embodiment, it may replace with the said cutting tool 2, and may provide the other cutting tools 40 as shown in FIG.7 and FIG.8. As shown in FIG. 7, the cutting tool 40 has a plurality of slit-shaped notches 41 at predetermined intervals in the circumferential direction. Moreover, as shown in FIG. 8, the peripheral part of the cutting tool 40 has the recessed part 42 formed in the circumferential direction. The notch 41 is formed across the recess 42, is cut deeper than the recess 42, and is open on both sides of the cutting tool 40. Further, the notch 41 is formed to be inclined with respect to the axis x of the cutting tool 40. A cutting blade 43 is formed by the edge of the recess 42 formed by each notch 41.

  According to the cutting tool 40 having such a shape, not only the cutting waste can be discharged to the outside of the cutting tool 40 by the cutout portion 41, but also the cutting waste can be discharged smoothly by the inclination of the cutout portion 41.

  In addition, a cutting tool 50 as shown in FIGS. 9 and 10 can be provided in the electrode shaping device 1. As shown in FIG. 9, the cutting tool 50 has a plurality of through-holes 51 formed at predetermined intervals in the circumferential direction. As shown in FIG. 10, the notch 51 is formed across the bottom 53 of the recess 52 formed in the circumferential direction on the peripheral edge of the cutting tool 50, and is open on both sides of the cutting tool 50. A cutting blade portion 54 is formed by the edge of the recess 52 formed by each notch 51. According to the cutting tool 50 having such a shape, the cutting waste can be discharged to the outside of the cutting tool 50 by the notch 51 which is a through hole.

The top view which shows the electrode shaping apparatus of one Embodiment of this invention. The side view of FIG. The perspective view of a cutting tool. Explanatory drawing which shows the cutting blade part of a cutting tool. Explanatory drawing which shows the position of the convex blade for every nail | claw-shaped convex part. Explanatory drawing which shows the electrode wheel and cutting tool at the time of shaping work. The side view which shows another cutting tool. The top view of the cutting tool of FIG. The side view which shows another cutting tool. Sectional drawing of the principal part of the cutting tool of FIG.

Explanation of symbols

  W ... electrode wheel, 1 ... electrode shaping device, 2, 40, 50 ... cutting tool, 12 ... second slide base (advance / retreat means), 23 ... motor (rotation drive means), 24 ... contact sensor, 30, 41, DESCRIPTION OF SYMBOLS 51 ... Notch part, 31 ... Claw-shaped convex part, 32, 42, 52 ... Recessed part, 33, 43, 54 ... Cutting blade part, 34 ... Bottom part, 35 ... Inner wall, 36 ... Convex blade.

Claims (8)

In an electrode shaping device for shaping a disk-shaped electrode ring provided in a seam welding machine,
A disk-shaped cutting tool that cuts the electrode surface at the outer peripheral tip of the electrode ring after welding, a rotational drive means for rotating the cutting tool in the circumferential direction, and the cutting tool abutting against the electrode wheel of the seam welding machine Advancing and retreating means for advancing and retreating along the direction,
The cutting tool has a plurality of recesses formed along the peripheral edge thereof and corresponding to the tip shape of the electrode ring, and cut out deeper than the recesses intersecting the recesses and opened on both sides of the cutting tool. An electrode shaping device comprising: a notch portion; and a cutting blade portion formed on an edge of the recess by each notch portion.   The electrode shaping device according to claim 1, wherein the cutout portion of the cutting tool is formed by a through hole that intersects the concave portion and penetrates the cutting tool in both sides.   2. The electrode shaping device according to claim 1, wherein the cutout portion of the cutting tool is formed in a slit shape by cutting the concave portion from a peripheral edge thereof.   The cutting tool includes a claw-like convex portion having a side-view nail shape that protrudes toward a peripheral portion by the plurality of notches, and the claw-shaped convex portion is formed on the concave portion and one end edge of the concave portion. The electrode shaping device according to claim 1, further comprising the cutting blade portion to be provided. The concave portion is constituted by a bottom portion and a pair of inner walls that are inclined so as to gradually expand facing the bottom portion,
On both inner walls of the recess, a plurality of wavy surfaces in the radial direction are formed with a phase shifted for each claw-shaped protrusion,
The cutting blade portion includes a plurality of convex blades formed by edges of the wavy surface,
5. The electrode shaping device according to claim 4, wherein the convex blade is provided at a different position for each claw-shaped convex portion due to a phase shift of the wavy surface. A contact-type sensor that is provided in the advance / retreat means, contacts the tip of the electrode wheel by the advancement of the advance / retreat means, and detects a position where the cutting tool contacts the electrode wheel and a target cutting amount of the electrode wheel;
6. The control device according to claim 1, further comprising a control unit configured to control the advance / retreat unit so that an amount of contact of the cutting tool with the electrode wheel is equal to a target cutting amount detected by the contact sensor. The electrode shaping apparatus of Claim 1.   The control means controls the advance / retreat means based on the contact position of the cutting tool with respect to the electrode wheel detected by the contact sensor, so that the cutting tool is moved to the first state immediately before the cutting tool comes into contact with the electrode wheel. Advancing at a predetermined speed, and thereafter increasing the amount of contact of the cutting tool with the electrode wheel at a second predetermined speed lower than the first predetermined speed until the target cutting amount detected by the contact sensor is reached. The electrode shaping apparatus according to claim 6.   The rotation driving means drives the cutting tool in a direction opposite to the rotation direction of the electrode wheel, at least when the cutting tool contacts the electrode wheel. Electrode shaping device.

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