JPH10170249A - Flash butt welding point detector for wheel rim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flash butt welding point detector for wheel rim, by installing a copy roller at the position where the roller can contact with both collapsed part of a flange and bead sheet part, and a color mark sensor which is supported by a copy roller supporting tool such that the sensor moves with the center of the roller. SOLUTION: A pressing roller 30 presses dropping part 1a, each copy roller 60 presses each bead sheet part 1c, and a flange pressing roller 40 presses axial outer surface of a flange collapsed part 1d on the A2 side. Then each copy roller 60 is moved to each flange collapsed part 1d by an air cylinder, and at the same time each guide roller 50 presses each flange cambering part 1e in the bottom part of the rim. Thus, one roller 60 contacts with the flange collapsed part 1d and the bead sheet part 1c on the A1 side due to pressing force of a spring 66 and an air cylinder. Another roller 60 contacts with those on the A2 side. Finally, the rim 1 is rotated by a roller 20 and welding part is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flash butt welding position detecting device for a wheel rim.

[0002]

2. Description of the Related Art A rim for an automobile is manufactured by cutting a flat steel plate into a predetermined size and rounding it, joining the butted portions by flash butt welding, and then forming the rim into a rim shape by a roll. After forming the rim, valve hole processing and air leak inspection are performed. Since the air leak inspection is performed on the welded portion, the rim has to be carried in an angular posture in which the welded portion faces the inspection device. Since the valve hole needs to be formed avoiding the welded portion, the rim must be carried into the valve hole drilling device at an angle at which the welded portion deviates from the punch. Therefore, the rim is rotationally positioned so that the weld is detected and the weld is at a predetermined angular position before the air leak inspection and the valve hole processing.
Conventionally, as shown in FIGS. 7 and 8, one color mark sensor 5 is provided opposite to the drop center portion 1a of the rim 1 to take advantage of the fact that the color differs between the welded portion and the other portion. No. 1 welding position is detected.

[0003]

However, the conventional welding position detection has the following problems. The drop portion 1a has a large deformation amount during molding and is easily damaged during molding. As a result, a flaw at the time of molding may be erroneously detected as a welded portion, and the accuracy of detection is reduced. Since the drop portion 1a is a portion that is not required to have high dimensional accuracy, the distance between the rim and the sensor fluctuates when measuring with a color mark sensor that requires a distance between the workpiece and the sensor, and the detection accuracy is reduced. descend. When the rim size is changed, the length in the rim axis direction also changes, so that the color mark sensor may face the transition to the side wall portion, and the distance between the rim and the color mark sensor changes. Therefore, when changing the rim size, it is necessary to move the color mark sensor in the rim axis direction for positioning, and it takes a long time for positioning. It is an object of the present invention to provide a flash butt welding position detecting device for a wheel rim that can increase the accuracy of detecting a welding position. Another object of the present invention is
An object of the present invention is to provide a flash butt welding position detecting device for a wheel rim, which can improve the accuracy of detecting a welding position and can reduce the time required for setting up the sensor when the rim size is changed.

[0004]

The present invention to achieve the above object is as follows. (1) A copying roller provided at each end in the rim axial direction and provided at a position capable of contacting both the flange depression portion and the bead seat portion, and each copying roller is provided so as to move together with the center of each copying roller. A flash butt welding position detection device for a wheel rim, comprising a color mark sensor supported by a support. (2) The flash butt welding position detection of the wheel rim according to (1), further comprising a setup pin for fixing the positions of the copying roller and the color mark sensor when each of the copying rollers and the color mark sensor are moved in the rim axis direction. apparatus.

[0005] In the apparatus (1), the color mark sensor is linked to the movement of the center of the copying roller, so that the flange dropping portion contacted by the copying roller can be set as the detection area of the color mark sensor. Since the flange recessed part is less likely to be damaged during molding than the drop part,
It is unlikely that a flaw is erroneously detected as a weld, and the detection accuracy of the welding position is increased. In addition, since the flange depression and the bead seat where the copying roller contacts are the parts where the tire is mounted and have higher dimensional accuracy than the drop, the distance between the rim and the color mark sensor must be kept constant. And the detection accuracy of the welding position is improved. In the device of the above (2), when the rim size is changed, the positions of the flange drop-in portion and the bead sheet portion change, so that the copying roller and the color mark sensor are moved in the rim axial direction. Since the positions of the copying roller and the color mark sensor after the movement are fixed by the setup pins, the copying roller and the color mark sensor can be positioned in a short time,
Setup when the rim size changes becomes simple.

[0006]

1 to 6 show an embodiment of the present invention. First, the structure of the rim will be described. The rim 1 is manufactured by rolling a flat steel plate, joining the butted portions by flash butt welding, and then forming the rim into a rim shape with a roll. The welding burrs generated by flash butt welding are trimmed before the rim shape is formed. The rim 1 has a drop part 1a whose diameter is reduced at the center part in the rim axial direction. Sidewall portions 1b extending radially outward are provided at both ends of the drop portion 1a in the rim axial direction.
Are connected. A bead seat portion 1c extending in the rim axis direction is connected to the outer peripheral portion of each sidewall portion 1b. A flange recess 1d extending outward in the radial direction is connected to an outer end of the bead seat portion 1c in the rim axial direction, and a flange bent portion 1e is connected to an outer peripheral end of each flange recess 1d. The flange recessed portion 1d and the flange bent portion 1e constitute a flange portion.

As shown in FIG. 1, a rim flash butt welding position detecting device 10 includes a rotating roller 20, two pressing rollers 30, a flange pressing roller 40, two guide rollers 50, two copying rollers 60, and two The color mark sensor 70 is provided. The rotating roller 20 is disposed inside the rim 1 and supports the upper portion of the rim 1 from inside. The rotating roller 20 includes a shaft 21, a fixed roller 22 fixed to the shaft 21, and a shaft 2.
1 comprises a movable roller 23 movable in the axial direction, and a collar 24 interposed between the fixed roller 22 and the movable roller 23. The collar 24 is exchanged for an optimum length according to the size of the rim 1. The fixed roller 22 has a receiving surface 22a that supports the bead sheet portion 1c on one flange portion side (A1 side) from the inside, and a flange drop portion 1d.
And a regulating surface 22b that can contact the outer surface in the axial direction. The movable roller 23 has a receiving surface 23a that supports the bead sheet portion 1c on the other flange portion side (A2 side) from inside. A motor (not shown) that drives the shaft 21 to rotate about the axis is provided on the shaft 21.
Are linked. The rim 1 is rotationally driven around the axis by the rotation of the fixed roller 22 and the movable roller 23 due to the rotation of the shaft 21. The rotation of the motor is controlled by a control device described later.

[0008] The two pressing rollers 30 are arranged outside the rim 1 and before and after the rotating roller 20 in the rim rotation direction. Each holding roller 30 is rotatably supported by a support member 31 around the axis. As shown in FIG. 5, the support member 31 can be moved and urged in the vertical direction by an air cylinder 34 supported by a fixed bracket 80. Each pressing roller 30 is pressed against the drop portion 1a from the outside by the urging force of a spring 32 provided on the outer periphery of the rod of the air cylinder 34.

The flange pressing roller 40 is adjacent to the movable roller 23. The flange holding roller 40 is movable in the axial direction with respect to the shaft 21,
Is pressed against the axially outer surface of the flange recess 1d. An end portion of the outer peripheral surface of the pressing roller 40 on the movable roller 23 side is formed on a tapered surface 41 whose diameter decreases as approaching the movable roller 23 side.
It has become a part of the escape. A removable stopper 42 is provided at the shaft end of the shaft 21. Between the pressing roller 40 and the stopper 42, the flange pressing roller 40 is urged in the axial direction, and the regulating surface 22b of the fixed roller 22 is
A spring 44 for sandwiching the rim 1 in the axial direction is provided between the spring 44 and the pressing roller 40.

[0010] The two guide rollers 50 are the rotating rollers 2.
It is arranged below 0. The guide rollers 50 are rotatable around the axis and are arranged at intervals in the rim axis direction. The guide roller 50 comes into contact with the flange warpage portion 1e of the rim 1 to regulate the movement of the rim 1 in the axial direction. Each guide roller 50 is movable in the rim axis direction, and its interval is changed according to the rim size.

[0011] The two copying rollers 60 include the rotating roller 20.
It is located above and is provided for the rim axial direction end. One copying roller 60 is rotatably supported by a support member 61 around an axis. The other copying roller 60 is rotatably supported by a support member 61 'around an axis. As shown in FIG.
It is movably supported in the vertical direction by an air cylinder 64. The support 61 ′ is vertically movably supported by another air cylinder 64. One copying roller 60
Is urged toward the fixed roller 22 by a spring 66 arranged on the outer periphery of the rod of the air cylinder 64. One copying roller 60 has a shaft center inclined with respect to the shaft center of the rim 1, and the outer peripheral surface of the roller can contact both the flange recessed portion 1d and the bead seat portion 1c on the A1 side. The other copying roller 60 is urged toward the movable roller 23 by a spring 66 provided on the outer periphery of the rod of the air cylinder 64. The other scanning roller 60 has a shaft center inclined with respect to the shaft center of the rim 1, and the roller outer peripheral surface has a flange recessed portion 1 on the A2 side.
d and the bead seat portion 1c.

Each of the supports 61 and 61 'has a sensor mounting portion 62 extending downward (the sensor mounting portion of the support 61' is not shown). The color mark sensor 70
The support 6 moves so as to move with the center of the copying roller 60.
1, 61 'are supported by the sensor mounting portion 62. The color mark sensor 70 detects the weld 2 using the fact that the color is different between the weld 2 and other parts. One color mark sensor 70 detects the welded portion 2 of the flange dropping portion 1d on the A1 side. The other color mark sensor 70 detects the welded portion 2 of the flange drop portion 1d on the A2 side. As shown in FIG. 6, it is desirable that the angle θ between each color mark sensor 70 and the rim axis be 8 to 15 °. The color mark sensors 70 provided at both ends in the rim axis direction are provided in the same plane including the rim axis, and detect the welded portion 2 at the same time. The output of each color mark sensor 70 is input to a control device (not shown). If the two color mark sensors 70 are simultaneously turned on while the rim 1 makes one rotation, the control device determines that the rim 1 is the welded portion 2 and performs positioning in the rotation direction of the rim 1 in the second round. The control device determines whether the signal from each color mark sensor 70 is other than the above (when two signals are not turned on, when only one is not turned on, or when two signals are turned on simultaneously).
Is determined to be NG when there are two or more places).

FIG. 5 shows a mechanism for moving the copying roller and the color mark sensor in the rim axis direction and fixing the same at the moving position. The hatched portion in FIG. 5 indicates the fixing bracket 80. At the end of the fixing bracket 80, a base 8
1 is movably supported in the rim axis direction. An air cylinder 82 is attached to the base 81. The rod of the air cylinder 82 is connected to one end of a connecting rod 83 extending in the rim axis direction. The other end of the connecting rod 83 is movably supported by a fixed bracket 80. One air cylinder 64 is fixed to the connecting rod 83. Connecting rod 83
, A movable bracket 84 is movably supported in the rim axis direction. The movable bracket 84 includes an air cylinder 85.
Is installed. The rod of the air cylinder 85 is connected to the other air cylinder 64 via another connecting rod 86. When the welding portion 2 is detected, the air cylinder 82 moves one of the copying rollers 60 to the flange dropping portion 1 on the A1 side.
Acts to press axially against d. Air cylinder 85
When the welding portion 2 is detected, the other copying roller 60
It works so as to press in the axial direction against the flange recessed portion 1d on the side.

At the end of the fixing bracket 80, a hole 88,
89 are formed at intervals in the rim axis direction. A hole 90 is formed in the base 81. Holes 88, 89,
Reference numeral 90 denotes a setup pin 91 for positioning the copying roller 60 and the color mark sensor 70 on the A1 side in the rim axis direction.
Can be inserted. As shown by the solid line in FIG. 5, when the setup pin 91 is inserted into the overlapped holes 88 and 90, the copying roller 60 and the color mark sensor 70 on the A1 side are fixed at the positions shown by the solid line. When the setup pin 91 is inserted into the holes 89 and 90 overlapped by moving the base 81 in the rim axis direction, the copying roller 60 and the color mark sensor 70 on the A1 side are fixed at the positions indicated by the two-dot chain line. You. Holes 93 and 94 are formed in the upper part of the fixing bracket 80 at intervals in the rim axis direction. The movable bracket 84 has a hole 9
5 are formed. A setup pin 96 for positioning the copying roller 60 and the color mark sensor 70 on the A2 side in the rim axis direction can be inserted into the holes 93, 94, and 95. As shown by the solid line in FIG. 5, when the setup pin 96 is inserted into the holes 93 and 95 overlapped,
The copying roller 60 and the color mark sensor 70 on the second side are fixed at positions indicated by solid lines. When the setup pin 92 is inserted into the holes 94 and 95 overlapped by the movement of the movable bracket 84 in the rim axis direction, the copying roller 60 and the color mark sensor 70 on the A2 side are fixed at the positions indicated by the two-dot chain line. Is done.

Next, the operation of the above welding position detecting device will be described. The rim 1 that has been formed into a rim shape by roll forming is transported to the rim flash butt welding position detecting device 10 by a transport device (not shown). As shown in FIG. 3, the rim 1 is supported by the rotating roller 20 from the inside at the top, in a posture in which the axial direction is horizontal. Next, the rotating roller 20 is raised by an air cylinder (not shown), and the rim 1 is lifted toward the pressing roller 30 side. In this state, as shown in FIG.
0 presses the drop portion 1a, the copying roller 60 presses the bead sheet portion 1c, and the flange pressing roller 40 presses the axially outer surface of the flange drop portion 1d on the A2 side. Thereafter, each copying roller 60 is connected to the air cylinders 82 and 8.
5, the guide rollers 50 move toward the respective flange recessed portions 1d, and at the same time, the respective guide rollers 50 press down the respective flange bent portions 1e at the lower portion of the rim. FIG. 1 shows a state in which each copying roller 60 has moved to the side of each of the flange recesses 1d.
In this state, one copying roller 60 is
6 and the pressing force of the air cylinder 82 make contact with both the flange recessed portion 1d and the bead seat portion 1c on the A1 side. The other copying roller 60 comes into contact with both the flange recessed portion 1d and the bead seat portion 1c on the A2 side by the pressing force of the spring 66 and the air cylinder 85.

Next, the rim 1 is rotated around the rim axis by the rotating roller 20 to detect the weld 2. Since the color mark sensor 70 detects at the flange recessed portion 1d which is not easily damaged during molding, it is unlikely that the scratch is erroneously detected as the welded portion 2 and the detection accuracy of the welding position is increased. The bead seat portion 1c and the flange drop-in portion 1d with which the copying roller 60 comes into contact are portions where tires (not shown) are mounted and have higher dimensional accuracy than the drop portion 1a. The distance can be kept constant. Color mark sensor 70
According to the characteristics, if the detection distance varies, the detection accuracy is reduced. However, since the distance between the color mark sensor 70 and the rim 1 is kept constant, the detection accuracy of the welding position is increased. In addition, since the rim 1 is pressed by each of the flange depression portions 1d and the bead seat portion 1c by each of the copying rollers 60, the vertical and rim axial vibrations are suppressed. Further, the rim 1 is restrained from oscillating in the direction of arrow F and the vertical direction by the rotating roller 20 and the pressing rollers 30, and is restrained from oscillating in the rim axial direction by the flange pressing roller 40 and the fixed roller 22. Therefore, the distance between the color mark sensor 70 and the rim 1 hardly changes. The determination of the welded portion 2 by the control device is based on the condition that the two color mark sensors 70 are simultaneously turned on, and thus occurs during molding as compared with the case where one color mark sensor 70 is used. Scratched weld 2
Erroneous detection is reduced.

When the welding portion 2 is detected in one rotation, the control device positions the rim 1 in the rotational direction so that the welding portion 2 comes to a predetermined position in the second rotation that follows. The positioned rim 1 is conveyed to an air leak inspection station while maintaining the rotation posture, where an air leak inspection is performed. Since the rim 1 is positioned so that the welded portion 2 comes to a predetermined position, an air leak test for the welded portion 2 can be performed. When the air leak inspection is completed, for example, valve hole processing is performed in the next step. In this case, rim 1
Is transferred to the next step without changing the posture, so that the valve hole can be formed while avoiding the welded portion 2.

When the rim size is changed, each copying roller 60 and each color mark sensor 70 are moved in the rim axis direction. As shown in FIG. 5, when these are moved, the setup pins 91 indicated by solid lines are removed from the holes 88 and 90, and the setup pins 96 are removed from the holes 93 and 95.
Then, the base 81 and the movable bracket 84 are moved in the rim axis direction, and the hole 90 is overlapped with the hole 89, and the hole 95 is moved.
To the hole 94. Then, as shown by the two-dot chain line, the setup pins 91 are inserted into the holes 90 and 89, and
4. Insert the setup pin 96 into the hole 95. In this state, each copying roller 60 and each color mark sensor 70 are fixed at the moving position. In this fixing, the setup of the color mark sensor 70 to the sensor mounting portion is not required,
Since it is only necessary to insert the setting pins 91 and 96, the setting when the rim size changes becomes simple and can be performed in a short time.

[0019]

According to the first aspect of the present invention, the copying roller provided at each end of the rim in the axial direction and provided at a position capable of contacting both the flange recessed portion and the bead seat portion, and each copying roller. And the color mark sensor supported by the support of each copying roller so as to move together with the center of the rim. The distance from the color mark sensor can be kept substantially constant, and the accuracy of detecting the welding position can be improved. According to the apparatus of the second aspect, since the copying roller and the setting pin for fixing the position of the color mark sensor in the rim axis direction are provided, even when the rim size is changed, the copying roller and the color mark sensor can be accurately and quickly. Positioning can be performed, and the time required for setup can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for detecting a flash butt welding position of a wheel rim according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view showing a state in which the wheel rim of FIG. 1 is transferred to a flash butt welding position detecting device.

FIG. 4 is a front view showing a state immediately before welding position detection is started by the apparatus of FIG. 1;

FIG. 5 is a front view showing a mechanism for moving the copying roller and the color mark center of FIG. 1 in the rim axis direction.

FIG. 6 is a partially enlarged front view showing an attached state of the color mark sensor of FIG. 1;

FIG. 7 is a front view of a conventional welding position detecting device.

FIG. 8 is a side view of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rim 1c Bead sheet part 1d Flange drop-in part 10 Flash butt welding position detecting device 20 Rotating roller 30 Pressing roller 40 Flange pressing roller 50 Guide roller 60 Copying roller 70 Color mark sensor 91, 96 Setup pin

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsuo Sakai 5-9, Yonbancho, Chiyoda-ku, Tokyo Topy Industries Co., Ltd.

Claims (2)

[Claims] 1. A copying roller provided at each end of a rim axial direction and provided at a position capable of contacting both a flange recessed portion and a bead seat portion, and each copying so as to move together with the center of each copying roller. A flash butt welding position detecting device for a wheel rim, comprising: a color mark sensor supported by a roller support. 2. The flash butt welding position of a wheel rim according to claim 1, further comprising a setup pin for fixing the positions of the copying roller and the color mark sensor when each of the copying roller and the color mark sensor is moved in the rim axial direction. Detection device.