JPH05133741A - Automatic measuring device for disc flatness - Google Patents

Abstract

PURPOSE:To shorten the measuring time, accomplish unmanned operation, and enhance the productivity by arranging a disc of large wheel on a disc receipt table, and measuring the flatness of the disc using measuring elements. CONSTITUTION:An automatic measuring device for the flatness of a disc includes measuring elements 6, 7 arranged on two concentrical circles on a disc receipt table 4, which rotates at pitches as equally divided, and linear scales 17, 18 arranged under the elements 6, 7 to measure the amount of their movement. This is also equipped with a calculation unit 24 to subject the output from the linear scales 17, 18 to a computational process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic disk flatness measuring device for automatically measuring the flatness of a disk of an automobile wheel mainly used for automobiles such as trucks, buses and light trucks.

[0002]

2. Description of the Related Art The tightened state when the above wheel is mounted on a hub of an automobile with a nut is greatly influenced by the radial inclination (hereinafter referred to as "dishing") of a disc mounting surface with a bolt hole interposed therebetween. .. Therefore, in order to obtain an appropriate tightened state, dishing is strictly controlled at the time of manufacturing the disc, and if the dishing value is out of the control value, it is corrected. This dishing amount is represented by the height difference between the inner diameter side and the outer diameter side across the bolt hole on a predetermined diameter. For a wheel having eight bolt holes, the height difference is 16 circumferentially equally divided positions. There are 6 bolt holes
In the case of the wheel of the hole, the difference in height at 12 equally divided positions in the circumferential direction is determined. Therefore, as a method of measuring the height difference,
Conventionally, a measuring jig with a dial gauge attached at a predetermined measuring position is placed on the flat surface of a disk, and an operator visually measures this.

[0003]

In the above-mentioned conventional visual measurement method, the operator must read a total of 32 dial gauges for an 8-hole wheel and a total of 24 dial gauges for a 6-hole wheel. In addition, the dial gauge is apt to be out of order, so it was necessary to frequently perform zero adjustment. Moreover, since it is necessary to read the dial gauge and calculate the height difference based on the difference between the dial gauge inside and outside each set, it takes a lot of time and effort. Further, this type of disk is heavy because of its large plate thickness and large diameter, and the measurement for a long time was extremely laborious for the operator.

The present invention has been made in view of the above conventional problems, and an object thereof is to achieve labor saving and improvement in productivity by automatically measuring the dishing amount of a large wheel. It is to provide a device that can do.

[0005]

In order to solve the above-mentioned problems, the disk flatness automatic measuring apparatus of the present invention has a disk pedestal arranged on the upper part of a spindle which rotates at equal pitches and has two concentric circles. On the top, place two measuring elements that are vertically slidable and are arranged in the diametrical direction.
As a set, a plurality of sets are arranged at equal intervals in the circumferential direction, and at least one set of linear scales for measuring the amount of movement of the above-mentioned probe is arranged below the disk cradle, and the output from the above-mentioned linear scale is taken into the arithmetic unit. The feature is that the difference in the amount of movement of the tracing stylus in each set is calculated.

[0006]

The disk pedestal has a plurality of sets of measuring elements, one set of two diametrically aligned, at the position where the flatness of the disk is to be measured. That is, 16 sets of 32 measuring elements are arranged on the disc pedestal for the 8-hole disc, and 12 sets of 24 measuring elements are arranged on the disc pedestal for the 6-hole disc, respectively, on a predetermined circumference. .. The measuring element is biased upward by a spring and its tip projects from the disk receiving base. Therefore, when the disk is placed on the disk receiving base, the measuring element is pushed down by its own weight. Below the disk pedestal, at least 1 is placed on the same diameter as the two concentric circles on which the above-mentioned probe is arranged.
Each linear scale is arranged, and this linear scale measures the amount of movement of the probe. By moving the spindle so that each probe stops on the linear scale and performing a measurement each time, the movement amount of all probes can be measured. Then, the dishing amount of the disk can be determined by the difference in the moving amount of the measured inner and outer measuring elements.

Further, since the disk is accurately centered by the work chuck every one pitch rotation of the spindle and the work chuck is opened at the time of measurement, an accurate dishing amount can be obtained in a natural mounting state without any constraint. Can be measured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

<Embodiment 1> As shown in FIGS. 1 and 2,
The automatic disk flatness measuring device 1 has a spindle 3 rotatably attached to a frame 2 and a disk receiving stand 4 which is detachably provided on the upper surface of the spindle 3. An air chuck W (so-called work chuck) in which a claw 5 moves by the action of air is arranged in the center of the disk pedestal 4, and an inner measuring element is provided around the air chuck W and on two concentric circles. 6 and the outer stylus 7 are arranged in parallel in the diametrical direction, and the two arranged in parallel are set as one set, and 12 sets are arranged at equal intervals in the circumferential direction.

As shown in FIG. 3, each of the above-mentioned measuring elements 6 and 7 is
The disk pedestal 4 is arranged so as to penetrate therethrough, and its tip 9 projects from the upper surface of the disk pedestal 4 by being biased upward by a spring 8. Further, on the upper surface of the disk pedestal 4 on which the outer measuring element 7 is arranged, there is formed a ridge 10 annularly provided over the entire circumference. Reference numeral 11 is a guide pin that is detachably attached to the tracing stylus 6 and 7, and has a flange at the lower end. Furthermore, ridges
The reference numeral 10 is provided for horizontally arranging the wheels, and can also be formed in the inner stylus 6.

Fixed blocks 12 are arranged on the frame 2 so as to surround the spindle 3 in four circumferentially divided positions. A movable block 14 arranged vertically movable along a guide rail 13 by a cylinder (not shown) is attached to each fixed block 12, and the movable block 14 can be horizontally adjusted by an air cylinder 16. The adjustment block 15 is attached. The adjustment block 15 has an inner measuring linear scale 17 and an outer measuring linear scale 18 so that the lower ends of the inner and outer stylus 6 and 7 are brought into contact with each other by the movement of the movable block 14.
have.

A rotary joint 19 for sending air for opening and closing the claw 5 is attached to the lower portion of the spindle 3, and a pulley for rotating the spindle 3 is provided, which is driven by a motor 20 via a belt. It The motor 20 is provided with a rotation detector 21 for controlling the pitch rotation of the disk pedestal 4. The rotation detection unit 21 is composed of a plate 22 and a sensor 23 or 25, and a notch provided in the plate 22 is used as a sensor 23.
Is to be detected.

An arithmetic unit 24 is connected to the linear scales 17 and 18, and outputs from the linear scales 17 and 18 are fetched to perform arithmetic operations, and the flatness is displayed on a display or printed out.

Next, the operation of the disk flatness automatic measuring device configured as described above will be described. Bolt hole pitch circle diameter (PCD) d shown in FIG. 6 is 285 mm
A case of measuring a disk D having eight bolt holes C will be described.

In the case of this disk D, the diameter of the measuring point a is 16 on the circumference of the inner side of 235 mm and the outer side of 340 mm.
There are 32 positions in total. So disk cradle 4
There are 16 inner measuring points 6 on the circumference of 235 mm in diameter, and 16 outer measuring points 7 on the circumference of 340 mm in diameter.
Inside and outside of the tracing stylus 6 and 7 are arranged at equal intervals so as to be arranged in the diameter direction.

First, before starting the measurement, a master ring (not shown) having a precisely flat surface formed by machining is placed on the ridge 10 formed on the disk receiving base 4. At this time, the lower surface of the master ring is the ridge 10 of the disk receiving stand 4.
It sticks on the upper part, and 32 stylus 6 and 7 are pushed down. In this state, the movable block 14 rises so that the inner measuring linear scale 17 is attached to the inner measuring head 6 and the outer measuring linear scale 18
Respectively contact the outer stylus 7 and measure their positions,
This value is stored in the arithmetic unit 24 as a reference value. That is, the reference value is a value when the tips of the tracing styluses 6 and 7 coincide with the upper surface of the ridge 10.

Since four sets of the linear scales 17 and 18 are arranged, the reference values of the four sets of tracing stylus are first set by the above operation. When the setting of the reference value for the first set is completed, the movable block 14 descends and is detected and controlled by the rotation detecting section 21 including the plate 22 and the sensor 23 having 16 notches, and the spindle 3 moves to 22.5. By rotating, the next set of probes 6 and 7 come on the linear scales 17 and 18, respectively. The movable block 14 rises again to set a reference value, and by repeating this four times, that is, for one-quarter revolution of the spindle 3, the reference values of all 16 sets of 32 measuring elements are set, and the master ring is set. To be removed.

When the above initial setting is completed, the measurement work is started. First, a disc is placed on the disc pedestal 4. (State of disk D in FIG. 1). At this time, positioning is performed in advance so that the portion of the disk D where the dishing should be measured is accurately positioned on the probes 6, 7. As a means for this, it is easy and reliable to detect the bolt holes and align the disks D in a predetermined direction.

The disc D is placed on the ridge 10 of the disc cradle 4.
Is placed, the claws 5 of the work chuck W are opened and the hub hole is chucked from the inside to center the disc D. Then, the claws 5 of the work chuck W are closed and the disc D is chucked. Freed from W. The 32 measuring elements 6 and 7 are pushed down by the own weight of the disk D, but the pressing amount of each is due to the dishing amount of the disk D and the waviness in the circumferential direction, so that depending on the contact point between the disk D and the measuring elements 6 and 7. different.

Next, similarly to the case of setting the reference value using the master ring, the movable block 14 is raised and the linear scales 17 and 18 are set to four sets of the inner probe 6 and the outer probe 7 at a time.
Measure the amount of push down. And the spindle 3 is 22.
Repeat the above measurement operation by rotating the pitch by 5 °
The push-down amount of all the contact points is measured by one measurement. In addition,
At this time, it is preferable that the claw 5 of the work chuck W is opened to position the disc D each time the disc cradle 4 is rotated, and the claw 5 of the work chuck W is closed to free the disc D at the time of measurement. is there.

The difference in the amount of depression of the inner and outer stylus 6 and 7 measured by the above is calculated by the arithmetic unit 24 for each set.
And the dishing amount is within the control value and the dishing amount is out of the control value and needs correction. In addition, those requiring correction are further classified into several layers according to the degree of difference.

Next, P. C. Explaining the case of measuring a disk D having D of 222.25 mm and 6 bolt holes, the disk pedestal 4 has a diameter 17 corresponding to the measurement position.
Twelve gauges are arranged at equal intervals on a circumference of 5 mm and 275 mm, and a total of 24 pieces are arranged. Then, move the adjustment block 15 horizontally so that the linear scale 1
Adjust so that 7 and 18 are located respectively. P. C. When measuring a disk with a D of 285 mm, each pair of probe 6,
The interval of 7 was 105mm, but here is 10
Although it is as small as 0 mm, it is a guide pin for contact points 6 and 7.
Since the collar provided on 11 is wide, it is not necessary to change the relative distance if the interval between the linear scales 17 and 18 is set to about 102.5 mm.

Further, in order to set the pitch rotation of the spindle 3 to 30 °, a plate 22 having a notch formed in 12 equal parts is formed.
The circuit is switched to the sensor 25 so as to be controlled by the control, and the movement amount of all the tracing stylus is measured by repeating the measurement of four sets three times, and the reference value setting by the master ring and the disc It is to measure.

In the above embodiment, the linear scale is used as the probe, but an ultrasonic type or other non-contact type sensor may be used. In that case, the movable block 14 moved up and down in the above embodiment is used. Can be omitted.
Further, although the linear scales 17 and 18 are fixedly arranged on the adjustment block 15, they may be arranged so as to be movable so that the distance between the linear scales 17 and 18 can be adjusted.

<Embodiment 2> In a measuring apparatus constructed in the same manner as in Embodiment 1 above, as shown in FIG. 4, a guide rail 26 is arranged above the disk receiving base 4, and the guide rail 26 is provided.
A transfer mechanism 29 composed of a cylinder 27 and an electromagnetic magnet 28 is arranged in 26 so as to reciprocate along a guide rail 26.

The operation of the disk flatness automatic measuring device configured as described above will be described. The disk D placed in the vicinity of the measuring device in advance is attracted and lifted by the electromagnetic magnet 28, transferred on the guide rail 26, and positioned above the disk receiving base 4. Next, the cylinder 27 is actuated to lower the disc D onto the disc pedestal 4, and the electromagnetic magnet 28 is turned off to release the disc D and place the disc D on the disc pedestal 4.

As described above, if the transport mechanism 29 is used, the measuring operation can be performed safely and surely. The reciprocating movement of the transfer mechanism can be performed manually or mechanically by a motor and a drive mechanism.

<Embodiment 3> In the above Embodiment 1, FIG.
As shown in FIG. 3, a supply stage 30 and an unloading stage 31 are arranged on both sides of the disc pedestal 4, and two guide rails 26 are arranged in parallel above the disc pedestal 4 across the supply stage 30 and the unloading stage 31. Deploy. In addition,
It is preferable that the heights of the disk mounting surfaces of the supply stage 30 and the unloading stage 31 are the same as the height of the disk receiving base 4. Further, although a roller conveyor is used as the carry-out stage 31 in the drawing, it can be a belt conveyor or a receiving stand, and a receiving stand is used as the supply stage 30, but a roller conveyor or a belt conveyor can be used.

A slide member 32 is provided on the guide rail 26.
Are arranged so as to be able to reciprocate over the supply stage 30 and the disk pedestal 4. A carry-in device 36 and a carry-out device 37 are arranged on the slide member 32 with a required space, and
Makes up 38. The carry-in device 36 and the carry-out device 37 are
4 rods that move up and down by air cylinder 35
34 and a plurality of electromagnetic magnets 28 provided at the lower end of the rod 34, and the rod 34 is slidably inserted in a rod guide 33 fixed to a slide member 32.

Reference numeral 39 in the drawing denotes a stopper, which stops the transport mechanism 38 at a predetermined position. The transfer mechanism 38 is moved by a driving device (not shown) such as a chain mechanism and a motor, and the air cylinder 35 is operated by a separately arranged compressor (not shown). Further, instead of the air cylinder 35, a hydraulic cylinder or other moving device for moving up and down can be used.

The operation of the disk flatness automatic measuring device configured as described above will be described. By operating the air cylinder 35 of the carry-in device 36 stopped above the supply stage 30 and pushing out the piston rod of the air cylinder 35, the rod 34 connected to the piston rod slides on the rod guide 33 and descends. The disk D previously supplied to the supply stage 30 is attracted to the electromagnetic magnet 28 provided at the lower end of the rod 34. At this time,
When the disk D whose flatness is measured is on the disk pedestal 4, the unloading device 37 is operated similarly to the loading device 36, and the disk D is attracted to the electromagnetic magnet 28. When the disk D is attracted to the electromagnetic magnet 28, the air cylinder 35 operates and the disk D is lifted upward.

Next, the transfer mechanism 38 moves to the left in FIG. 5 with the disk D attracted, and the transfer mechanism 38 stops when the carry-in device 36 comes above the disk receiving table 4. In this case, the stopper 39 may be fixed in advance at a predetermined position to detect that the end of the transport mechanism 38 has come into contact with the stopper 39 and stop the transport mechanism 38.

As described above, the disk D stopped above the disk receiving base 4 is lowered onto the disk receiving base 4 by operating the air cylinder 35 of the carry-in device 36, and the electromagnetic magnet 28 is cut off. Thus, the disc D is placed on the disc pedestal 4. At this time, the measured disk D adsorbed by the carry-out device 37 is transferred to the carry-out stage 31 by the movement of the carrying mechanism 38, and the disk D is placed on the disk receiving table 4 by the carry-in device 36. At the same time, the disc D transferred to the unloading stage 31 is released onto the unloading stage 31.

The flatness of the disk D placed on the disk cradle 4 as described above is measured in the same manner as in the first embodiment, and at the same time, the carrying mechanism 38 causes the carry-in device 36 to feed the stage.
Go back up to 30 and stop. Hereinafter, the disk D is similarly transported and measured. In this case,
The disk D on the carry-out stage 31 is either manually dropped on the spot or sent out by a conveyor.

[0035]

Since the disk flatness automatic measuring device of the present invention has the above-mentioned structure, there is no measurement error which may occur in the case of visual measurement or individual difference of the measurer, and always perform accurate measurement. Is possible. Moreover, since the measurement can be carried out fully automatically, no burden is imposed on the operator. Moreover, since the measurement speed is very fast, it has many excellent effects that the productivity is greatly improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of essential parts showing an embodiment of an automatic disk flatness measuring device of the present invention.

FIG. 2 is a plan view of a disk pedestal in the automatic disk flatness measuring device of the present invention.

FIG. 3A is an explanatory view of a main part showing the relationship between the measuring element and the linear scale in the disk flatness automatic measuring device of the present invention, and FIG. FIG.

FIG. 4 is a principal part explanatory view showing another embodiment of the automatic disk flatness measuring device of the present invention.

FIG. 5 is a principal part explanatory view showing another embodiment of the automatic disk flatness measuring device of the present invention.

FIG. 6A is a partially cutaway front view of the wheel,
6B is a sectional view taken along line XX in FIG.

[Explanation of symbols]

 1 Automatic disc flatness measuring device 2 Frame 3 Spindle 4 Disc cradle 5 Claw 6 Inner gauge head 7 Outer gauge head 8 Spring 9 Tip 10 Convex strip 11 Collar 12 Fixed block 13 Guide rail 14 Movable block 15 Adjustment block 16 Air cylinder 17 Inner measurement linear scale 18 Outer measurement linear scale 19 Rotary joint 20 Motor 21 Rotation detector 22 Plate 23, 25 Sensor 24 Arithmetic unit 26 Guide rail 27 Cylinder 28 Electromagnetic magnet 29 Transfer mechanism 30 Supply stage 31 Delivery stage 32 Slide member 33 Rod guide 34 Rod 35 Air cylinder 36 Carry-in device 37 Carry-out device 38 Transfer mechanism 39 Stopper

Claims (5)

[Claims] 1. A disk is provided with a spindle on which a disk pedestal is removably mounted and is rotatably arranged, and a plurality of fixed blocks, on which movable blocks are vertically movable, are arranged around the spindle. On the concentric circle of the pedestal, one set of styli consisting of the inner styli and the outer styli arranged in parallel in the diametrical direction of the disc pedestal is provided in plural sets at equal intervals in the circumferential direction, In addition, the movable block is provided with an inner measuring linear scale and an outer measuring linear scale that come into contact with the lower end surfaces of the inner measuring element and the outer measuring element, respectively, and the output from the linear scale is fetched to perform calculation. An automatic disk flatness measuring device having an arithmetic unit. 2. The disk flatness automatic measuring device according to claim 1, wherein a work chuck that opens and closes every one pitch rotation of the spindle is arranged in the center of the disk receiving base. 3. The linear scale for measuring inside and the linear scale for measuring outside according to claim 1 or 2, wherein the adjusting block is arranged on a movable block so as to be positionally adjustable in a horizontal direction. Automatic disk flatness measuring device. 4. The transport according to claim 1, 2, or 3, wherein a guide rail is arranged above the disk receiving base, and an electromagnetic magnet for attracting and releasing the disk is vertically movable. An automatic disk flatness measuring device in which the mechanism is arranged so as to reciprocate along a guide rail. 5. The disk stage according to claim 1, wherein a supply stage and an unloading stage are arranged on both sides of the disk pedestal, and a guide is provided above the disk pedestal over the supply stage and the unloading stage. A rail is arranged, and on the guide rail, a carrying mechanism having a loading device and a unloading device provided with electromagnetic magnets that are vertically movable is arranged at required intervals, and is arranged so as to reciprocate along the guide rail. Automatic disk flatness measuring device.