JPH10193165A - Flash butt welding position detecting device for wheel rim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clearly recognize a welded part by the color difference between the welded part and the other part, and to improve the detection precision of the welding position by arranging a color mark sensor at the position corresponding to the inside of a drop part of a wheel rim outwardly in the radial direction. SOLUTION: A rim flash butt welding position detecting device 10 is provided with two rollers 20, a holding roller 30, a flange holding roller 40, a guide roller 50, a copying roller 60, and two color mark sensors 70. The color mark sensors 70 are arranged at the position corresponding to the inside of a drop part 1a of a rim 1 outwardly in the radial direction, and are constantly opposite to an inner circumferential surface of the drop part 1a even when the length in the axial direction of the rim is changed by the change of the rim size. The erroneous detection of flaws during the forming as the welded part can be reduced.

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.
One color mark sensor 5 is arranged to face the outer peripheral surface of a, and the welding position of the rim 1 is detected by utilizing the fact that the color differs between the welded portion and the other portion.

[0003]

However, the conventional welding position detection has the following problems. The outer peripheral surface of the rim is liable to be hit by the forming roll at the time of forming, and the color difference between the welded portion and other portions tends to be unclear, resulting in erroneous detection or non-detection of the welded portion. When the rim size is changed, the length in the rim axis direction also changes, so that the color mark sensor may interfere with the sidewall located at the end of the drop portion in the rim axis direction. Therefore, when changing the rim size, it is necessary to move the color mark sensor in the rim axis direction for positioning.
It takes time to set up the sensor. 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 to provide a flash butt welding position detecting device for a wheel rim, which can improve the detection accuracy of a welding position and can eliminate the need for setting up a sensor when the rim size is changed. is there.

[0004]

The present invention to achieve the above object is as follows. (1) A flash butt welding position detecting device for a wheel rim, which is provided with a color mark sensor, and the color mark sensor is disposed radially outward at a position corresponding to the inside of the drop portion of the wheel rim. (2) The image forming apparatus further includes a copying roller urged to the outer peripheral side at a position corresponding to the inside of the axial center portion of the drop portion of the wheel rim, and the color mark sensor is provided on both sides of the copying roller with the copying roller center. The above (1) provided so as to be connected to the support of the copying roller so as to perform the same movement.
The flash butt welding position detecting device for a wheel rim according to the above.

[0005] In the apparatus of the above (1), the inner peripheral surface of the rim drop portion is a portion where the color difference between the welded portion and the portion other than the welded portion is clearly left, and is a portion which is hardly damaged during molding. Since the sensor is disposed outward at a position corresponding to the inside of the rim drop portion, when the rim is carried into the detection device and the welding position is detected, the color mark sensor performs welding on the inner surface of the rim drop. Part can be detected, and the detection accuracy of the welding position increases. The above (2)
In the apparatus of the above, since the copying roller is disposed inside the center of the drop section in the axial direction and the color mark sensors are provided on both sides of the copying roller, the rim is carried into the detection device, and the center of the drop section in the axial direction and the copying roller are moved. When the welding position is detected in alignment with the axial direction, the color mark sensor faces the inner surface of both sides of the axial center of the drop part regardless of the rim size. There is no need to change the setup.

[0006]

1 to 5 show an embodiment of the present invention. First, the structure of the rim will be described. The rim 1 is manufactured by cutting and rounding a flat steel plate to a predetermined size, joining the butted portions by flash butt welding, and then forming the 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. Drop part 1
Side walls 1b extending outward in the radial direction are connected to both ends in the rim axial direction of a. 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, the rim flash butt welding position detecting device 10 includes two rotating rollers 20, 2.
Pressing roller 30, flange pressing roller 40, 2
It has one guide roller 50, copying roller 60, and two color mark sensors 70. Two rotating rollers 20
Are arranged at intervals in the rim rotation direction, and support the upper portion of the rim 1 from the inside with the axis of the rim 1 being horizontal. Each rotating roller 20 is mounted at the same height. Each rotating roller 20 is vertically movable by an air cylinder (not shown). Each rotating roller 20
A shaft 21, a fixed roller 22 fixed to the shaft 21, a movable roller 23 axially movable with respect to the shaft 21, and a collar 24 interposed between the fixed roller 22 and the movable roller 23. Consists of The collar 24 is exchanged for an optimal length according to the axial size of the rim 1. The fixed roller 22 has one flange portion side (A1
Receiving surface 2 for supporting the bead seat portion 1c of the side) from the inside
2a and a regulating surface 22b that can contact the axially outer surface of the flange recess 1d are formed. 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. One rotating roller (right rotating roller in FIG. 2) 2
The 0 shaft 21 is connected to a motor (not shown) that drives the shaft 21 to rotate around the axis. Rim 1
The rotation of the rotation roller 20 caused by the rotation of the shaft 21 drives the rotation about the rim axis. The rotation of the motor is controlled by a control device described later.

The two pressing rollers 30 are arranged outside the rim 1 at intervals in the rim rotation direction. Each pressing roller 30 is located above each rotating roller 20. Each holding roller 30 is rotatably supported by a support member 31 around the axis. Support member 31
Is vertically movably supported by a stationary member 34 located above. Each pressing roller 30 is pressed from the outside to the axial center of the drop portion 1a by springs 32 provided around the two rods 31a of the support member 31, respectively.

The flange pressing roller 40 is adjacent to the movable roller 23 in the axial direction. Flange holding roller 4
0 is axially movable with respect to the shaft 21;
Is pressed against the axially outer surface of the flange recess 1d. The movable roller 23 of the outer peripheral surface of the pressing roller 40
The end on the side is formed on a tapered surface 41 whose diameter decreases as approaching the movable roller 23 side, and serves as a relief for the R portion of the flange portion. The shaft end of the shaft 21 is provided with a removable spring retainer 42. A spring 44 for urging the flange holding roller 40 in the axial direction is provided between the flange holding roller 40 and the spring holding member 42, and a rim 1 is provided between the regulating surface 22 b of the fixed roller 22 and the holding roller 40. Is sandwiched in the axial direction.

The two guide rollers 50 are arranged at positions below the horizontal rim 1 so as to oppose each other in the axial direction.
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 curving portion 1 e of the rim 1 and regulates the inclination of the rim 1. Each guide roller 50 is movable in the rim axis direction, and the interval is changed according to the rim size.

In the illustrated example, the copying roller 60 is disposed at a position corresponding to the inside of the axial center of the drop portion 1a of the rim 1. The copying roller 60 is moved by 2 in the rim rotation direction.
It is located between the two rotating rollers 20. As shown in FIG. 3, the copying roller 60 includes a shaft 62 of a support 61.
, And is rotatable around a shaft centered on a shaft 62. The support 61 is held movably in the vertical direction with respect to the member 64. The member 64 is
It is movable up and down together with the rotating roller 20. The copying roller 60 has a roller outer peripheral surface that can contact the inner peripheral surface of the drop portion 1a, and is urged outward in the rim radial direction by a spring 66 provided around a rod of the support member 61. Accordingly, even when the rim diameter changes due to the change in the rim size, the copying roller 60 is pressed against the inner peripheral surface of the drop portion 1a.

The two color mark sensors 70 are connected to the rim 1
Of the rim radially outward at a position corresponding to the inside of the drop portion 1a, and always faces the inner peripheral surface of the drop portion 1a even if the length in the rim axial direction changes due to a change in the rim size. . The color mark sensor 70 moves the support 6 so that the same movement as the movement of the center of the copying roller 60 is performed.
1 sensor mounting portions 63 formed on both sides in the axial direction of the rim
Respectively. The two color mark sensors 70 are provided in the same plane including the rim axis and detect the weld 2 at the same time. Color mark sensor 7
0 detects the welded portion 2 by utilizing the fact that the color is different between the welded portion 2 and other portions. Each color mark sensor 7
The output signal of 0 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 welding portion 2 is present, and positions the welding position at a predetermined position in the second round and stops. The rim 1 is positioned in the rotational direction. 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 simultaneously turned on at two or more places during one rotation). Is determined to be NG.

Next, the operation 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). In this state, each rotating roller 20 is located inside the rim 1. Next, the members 64 holding the respective rotating rollers 20 and the support members 61 are raised by an air cylinder (not shown), and the rim 1 is lifted toward the pressing roller 30 by the respective rotating rollers 20 as shown in FIG. In this state, each pressing roller 30 presses the outer peripheral surface of the drop portion 1a, the copying roller 60 presses the inner peripheral surface of the drop portion 1a, and the flange pressing roller 40 presses the axial outer surface of the flange drop portion 1d on the A2 side. .

Next, the rim 1 is rotated around the rim axis by a rotating roller 20 to detect the welding position. The color mark sensor 70 detects the welded portion 2 on the inner peripheral surface of the drop portion 1a, which is hardly damaged by the forming roll at the time of forming, and has a clear color difference between the welded portion 2 and the portion other than the welded portion. Is less likely to be erroneously detected as the welded portion 2, the welded portion 2 can be clearly recognized, and the detection accuracy of the welding position is increased. The color mark sensor 70 is
If the detection distance varies, the detection accuracy decreases, but the copying roller 60 follows the inner peripheral surface of the drop portion 1a, so that the distance between the color mark sensor 70 and the rim 1 is kept substantially constant, and the welding position is reduced. Detection accuracy increases. 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 roller 30, and the rim 1 is restrained from oscillating in the rim axial direction by the flange pressing roller 40 and the fixed roller 22. The distance between the rim 1 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. False detection of a flaw as a weld 2 is reduced.

When the welded portion 2 is detected in one rotation, the control device positions the rim 1 in the rotational direction so that the welded 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, the length in the rim axis direction changes. When the rim 1 is carried into the welding position detecting device 10 and the welding position is detected by aligning the center of the drop portion 1a in the axial direction with the copying roller 60 in the axial direction, the color mark sensor 70 is used regardless of the rim size.
Is opposed to the inner peripheral surface of the drop portion 1a, the color mark sensor 70 does not interfere with the side wall portion 1b.
There is no need to change the setup. When the rim size is changed, the rim diameter also changes as shown in FIGS.
Since 0 is pressed against the inner peripheral surface of the drop portion 1a by the urging force of the spring 66 even when the rim diameter changes, the position adjustment of the color mark sensor 70 in the rim radial direction is not required.

[0017]

According to the first aspect of the present invention, since the color mark sensor is disposed at a position corresponding to the inside of the drop portion of the wheel rim toward the outside in the radial direction of the rim, a flaw at the time of forming is formed between the weld portion and the welding portion. The number of erroneous detections is reduced, and the welded portion can be clearly recognized by the color difference between the welded portion and another portion, so that the detection accuracy of the welding position can be improved. According to the apparatus of claim 2, further comprising a scanning roller urged radially outward in a position corresponding to the inside of the axial center portion of the drop portion of the wheel rim, wherein the color mark sensor is provided on both sides of the scanning roller. It is connected to the support of the copying roller so that it moves in the same way as the center of the copying roller, so the color mark sensor can face the inner peripheral surface of the drop part regardless of the rim size, and the rim size changes However, it is not necessary to change the color mark sensor.

[Brief description of the drawings]

FIG. 1 is a front view showing a detection state of a welding position by a flash butt welding position detecting device for a wheel rim according to an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a partially enlarged front view showing a state where the copying roller of FIG. 1 is pressed against an inner peripheral surface of a drop portion of a wheel rim.

FIG. 4 is a side view showing a detection state of a welding position of a small diameter wheel rim by the apparatus of FIG. 1;

FIG. 5 is a side view showing a detection state of a welding position of a large-diameter wheel rim by the apparatus of FIG. 1;

FIG. 6 is a front view of a conventional welding position detecting device.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rim 1a Drop part 10 Flash butt welding position detecting device 20 Rotating roller 30 Pressing roller 40 Flange pressing roller 50 Guide roller 60 Copying roller 61 Supporting tool 66 Spring 70 Color mark sensor

 ──────────────────────────────────────────────────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 flash butt welding position detecting device for a wheel rim, comprising a color mark sensor, wherein the color mark sensor is disposed radially outward at a position corresponding to the inside of a drop portion of the wheel rim. 2. The image forming apparatus according to claim 1, further comprising a scanning roller urged to an outer peripheral side at a position corresponding to an inner side of a center portion of the drop portion of the wheel rim in the axial direction, wherein the color mark sensor is located on both sides of the scanning roller. 2. The flash butt welding position detecting device for a wheel rim according to claim 1, wherein the device is provided so as to be connected to a support of the copying roller so as to perform the same movement as the center.