JPH0128405Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for measuring the roundness of a hole diameter or outer diameter of a workpiece.

Conventionally, when measuring the roundness of the hole diameter or outer diameter of a workpiece, it has been common to keep the measurement head fixed and rotate the workpiece to be measured. However, this method has the problem that slips tend to occur between the workpiece to be measured and the rotary drive unit, and the measurement of roundness does not necessarily give an accurate value. Furthermore, since the workpiece is rotated together with a workpiece fixing device during measurement, when a large number of workpieces are to be measured continuously, the apparatus becomes complicated and large.

This invention securely holds the object by fixing the object to be measured and rotating the measuring head, preventing slips between the object and the measuring head, and adjusting the angle of rotation and the measured value. It is possible to accurately determine the relationship between The present invention provides a mounting device.

That is, the present invention includes a measuring table 22 for positioning the workpiece in order to measure the roundness of the inner wall or outer wall of the workpiece, and measuring elements 7, 8, 55, and 56 that contact the inner wall or outer wall of the workpiece. a pair of measuring levers 3, 4, 52, 53 that are parallel to each other and extend in the direction of the measuring table; and applying a biasing force to each of the measuring levers to press each measuring element against the workpiece. a detector 10 that measures the differential between the biasing members 9 and 54 and the pair of measurement levers;
, protectors 20 and 57 that protect and position the measuring lever; an indexing device 1a that rotates the lever and protector together by at least 180 degrees; Floating plate 2 to correct
and a gauge holder 23 that holds a master gauge 29 and presses the workpiece or master gauge to the measuring position of the measuring table, and each of the pair of measuring levers is supported by a parallel leaf spring 5, 5', 6, 6'. The roundness measuring device is characterized in that the floating plate is connected to the floating plate.

In order to explain the roundness measuring device of the present invention in more detail, one embodiment of the roundness measuring device of the present invention will be specifically described below.

FIG. 1 shows a vertical sectional view of the inner diameter roundness measuring device of the present invention for measuring the inner diameter of a cylindrical workpiece, and FIG. 2 shows a rear view of the measuring head seen from the right side of FIG. FIG. 3 is an enlarged cross-sectional view taken along the line A--A in FIG. 2.

As shown in FIG. 1, the roundness measuring device 1 of the present invention mainly includes an indexing device 1a that rotates a measuring head 1b, and a measuring device 1a that is rotated by the indexing device 1a to measure the roundness of the inner diameter of a workpiece. Inner diameter measuring head 1
b, and a work fixing part 1c for fixing the work, which are arranged vertically.

In FIG. 1, a measuring head 1a, which is a main part of the roundness measuring device 1 of the present invention, includes a rotating body 11 arranged at its upper end and rotated by a rotating shaft 36, and a floating ball 12 inside the rotating body 11. A floating plate 2 supported above and floating within the rotating body 11, two pairs of parallel plate springs 5, 5' and 6, 6' suspended from the floating plate 2, and the parallel plate springs 5, Measuring levers 3 and 4 suspended from the lower ends of 5' and 6, 6', respectively;
Measuring elements 7 and 8 are arranged inside the tip portions of the parallel plate springs 5, 5' and 6, 6' in a direction perpendicular to the parallel planes thereof, respectively, and the measuring levers 3 and 4 are connected to each other. It is composed of a push spring 9 that brings the measuring levers 3 and 4 closer together, and a differential transformer 10a that measures changes in the distance between the measuring levers 3 and 4.

The two pairs of parallel plate springs 5, 5' and 6, 6' suspended from the floating plate 2 are arranged at equal distances from the center of rotation of the floating plate 2, so that the measuring head When 1a rotates, it rotates with measuring levers 3 and 4 fixed to its lower end hanging down. The measuring levers 3 and 4
can only swing in the thickness direction due to the elastic force of the parallel leaf springs 5, 5' and 6, 6'.
floating plate 2 and parallel plate springs 5, 5' and 6,
6' and a space 5a surrounded by the measuring levers 3 and 4;
6a rotates while maintaining a parallelogram shape, the measuring levers 3 and 4 suspended from the parallel plate springs 5, 5' and 6, 6' remain perpendicular to each other and parallel to each other. Rotate.

The inner diameter measuring head 51a or the outer diameter measuring head 51b is selected and used depending on whether the circularity of the inner diameter or the outer diameter of the workpiece is to be measured. Note that in the outer diameter measurement head, the first
A tension spring is used as the push spring 9 in the figure.

When measuring the roundness of the inner diameter of the workpiece, the first
As shown in the figure, move the measuring levers 3 and 4 to the workpiece 21.
is inserted into the hole to be measured, and both are pressed against the inner diameter of the workpiece 21 by the push spring 9,
When the probes 7 and 8 disposed on the outside of the measurement levers 3 and 4 are moved around the inner periphery of the hole in the workpiece, the measurement levers 3 and 4 oscillate due to the unevenness of the surface of the hole in the workpiece. Since the movement occurs only in the thickness direction of the parallel plate springs 5, 5' and 6, 6', both swing in the same direction and independently of each other, resulting in a variation in the distance between the measuring levers 3 and 4. .

Therefore, the variation in the distance between the measuring levers 3 and 4 can be detected by a differential transformer 10a that measures the distance between the measuring elements 7 and 8 disposed at the tips of the measuring levers 3 and 4. 10 to determine accurate roundness.

Since the roundness measuring device has such a structure, even if the center of rotation of the inner diameter measuring head 1 and the center of the workpiece are slightly deviated from each other, the workpiece is supported on the floating ball 12 in the rotating body 11. A space 5a that holds a parallelogram formed by the floating plate 2 floating within the rotating body 11 or by the parallel plate springs 5, 5' and 6, 6' suspended from the floating plate 2. , 6a, it is possible to keep the distance between the measuring levers 3 and 4 constant, and the workpiece 21 can be easily aligned without strictly centering the center of the inner diameter measuring head 51a and the center of the workpiece 21.
The roundness of can be measured.

The rotating body 11 of the inner diameter measuring head 51a is attached to a rotating shaft 36 of the indexing device 1a, and the rotating shaft 36 is supported by a bearing 35 and rotates.

Further, the measuring tips 7 and 8 are attached to the tips of the pair of measuring levers 3 and 4 inserted into the workpiece 21, and the measuring tips 7 and 8, as shown in FIG.
It is surrounded and protected by a protector 20 attached to the side plate 33 of the inner diameter measuring head 51a, and a portion of the probes 7 and 8 protrude to the outside through holes made in the protector 20. The outer diameter of the protector 20 is designed such that its maximum part has a clearance of about 20 μ, for example, with respect to the reference diameter of the hole in the workpiece 21 to be measured, to an extent that exceeds the tolerance. Further, it is preferable that the outer diameter of the tip portion of the protector is further reduced. This is because the workpiece 21 can be easily inserted into the hole even if the workpiece 21 is slightly misaligned. Thus, the protector 20 protects the contact points 7 and 8.
This prevents the hole from expanding more than necessary and being damaged by the upper edge of the hole in the workpiece 21, and also serves as a guide for correctly bringing the probe into contact with the measuring position. It also has the effect of protecting the measuring lever from external shocks during times other than when measuring.

Inside the rotating body 11 of the inner diameter measuring head 51a,
A floating plate 2 supported on a floating ball 12 and floating is disposed, and an oil damper 13 is formed between the upper surface of the floating plate 2 and the rotating body 11. Therefore, even if the measurement head 1 is slightly misaligned with respect to the workpiece 21 to be measured, it can be easily aligned by moving the floating plate.

A rotation stopper 14 is inserted into the side of the floating plate 2 from the rotating body 11.
This prevents rotational misalignment between the head and the measuring head. The rotating body 11 is rotated by a rotating shaft 36 supported by a bearing 35 attached to a substrate 34. The rotational drive is performed by receiving the rotation of the drive bevel gear 16 by the motor 15 by the driven bevel gear 17 of the rotating shaft 14. A confirmation disk 18 that rotates together with the rotation shaft is further attached to the rotation shaft, and the confirmation disk 1
8 is measured by a confirmation switch 19. The rotation angle can be measured by, for example, detecting a small hole drilled in the confirmation disk using the optical system of the confirmation switch 19, or by other various methods. This confirmation switch 19 confirms that the measuring head has rotated by 180 degrees or more, and performs the necessary switch operations.

The bearing 35 and the motor 15 are mounted on a base plate 34, and the base plate 34 can be moved vertically up and down to lower the measuring head 1 onto the workpiece 21,
Further, after the measurement is completed, it is separated from the workpiece 21.

The workpiece 21 to be measured is attached to the workpiece fixing part 1c.
Gauge holder 23 is inserted into the V-shaped notch of measuring table 22.
It is pressed and fixed by the FIG. 4 is a plan view showing one embodiment of transporting and fixing a workpiece. The workpiece 21 held between the conveyance claws 24 is intermittently driven by the conveyance chain 25 and transferred to the measuring table 2.
It will be brought in before 2. Then, the rotating cam 2, which is interlocked by an intermittent indexing mechanism (not shown) for conveyance,
6 and tension spring 27, the gauge holder 2
3 presses the workpiece onto the measuring table 22, and the workpiece 21 is released into the back play of the conveying claw, is pressed against the V-shaped notch 28 of the measuring table, and is fixed in a fixed position for measurement. As soon as the measurement is completed, the rotating cam 26
As a result, the press of the gauge holder 23 retreats from the workpiece 21, and the workpiece 21 is pushed back along one side of the V-shaped cut by the movement of the conveyance claw 24.
It returns to the holding part and is carried out in that state.

The gauge holder 23 holds a master gauge 29 for zero point correction of the measuring head in its pressing portion. The diameter of the holding hole 30 of the gauge holder 23 that holds the master gauge 29 is set to be sufficiently large in order to provide freedom in movement of the master gauge 29.
Zero point correction is performed as follows.

In the process of continuously measuring the roundness of the workpiece, the charging of the workpiece 21 is intermittently stopped by the zero point correction command.
When the conveyor claw without the workpiece 21 attached thereto comes to the measuring table 22, the stopper 31, which had been restricting the pressing stroke of the gauge holder 23, is removed by the drive motor 32, and the gauge holder 23 is moved by the rotating cam. The rotation of 26 forces the master gauge 29 into the V-shaped notch 28 of the measuring platform in the empty conveying claw. As a result, the measuring head performs measurements on the master gauge, and zero point correction of the measured values is performed. When the zero point correction measurement is completed and the measuring head is pulled up, workpiece loading is started again, the gauge holder 23 is returned to the front position by the rotary cam 26, and the stopper 31 is set to the locking position again.

The same method is used when measuring the roundness of the outer diameter of the workpiece. FIG. 5 is a vertical sectional view of a measuring head 50 used for measuring the outer diameter, FIG. 6 is a rear view thereof, and FIG. 7 is an enlarged view of the lower surface of its tip.

Outer diameter measuring head 51b for measuring the roundness of the outer diameter
In this case, the pair of measuring levers 52, 53 are drawn together by the tension spring 54, and the measuring elements 55, 56 protrude inward. A protector 57 attached to the lower end of the side plate 33 fixed to the floating plate 2 is connected to the measuring levers 53 and 5.
It is fixed in a shape that surrounds the outer periphery of the workpiece 21, which is the object to be measured, except for the part 4. It is preferable that the inner diameter of the protector 57 has a clearance of about 20 μm with respect to the standard outer shape of the workpiece. protector 57
The distal end of the protector can be further tapered and widened to make it easier for the protector to conform to the outer circumference of the workpiece when the measuring head is lowered. The edge of the protector 57 is slightly inside the measuring lever,
The pair of measuring levers 52 and 53, which are drawn together by a tension spring, are prevented from being separated from each other more than necessary.

The measurement of the differential of the measurement lever is not limited to the illustrated differential transformer, and other methods such as air micro measurement can be used.

In the roundness measuring method of the present invention, the protector makes it easy for the measuring tip to fit the workpiece, and even if there is some misalignment, alignment is achieved using the parallel plate springs and the floating plate. Also, the measuring head
The measuring head automatically floats even when rotated 180°, so there is no strain on both the head and the workpiece, so the rotation angle and measured value correspond correctly, allowing for highly accurate measurements. be able to. In addition, zero point correction is performed by the master gauge under the same conditions as the workpiece measurement, and by performing this zero point correction normally and automatically, correct measured values can always be obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the workpiece inner diameter roundness measuring device according to the present invention, Fig. 2 is a rear view of only the measuring head, and Fig. 3 is an enlarged view of the A-A cross section in Fig. 2. . FIG. 4 is a plan view illustrating the conveyance of the workpiece and the operation of the gauge holder. Fifth
The figure is a vertical sectional view of the outer diameter measuring head, FIG. 6 is a rear view thereof, and FIG. 7 is an enlarged view of the lower surface of the tip of the measuring head. The correspondence between the main parts illustrated and the symbols is as follows. 1... Roundness measuring device, 1a... Indexing device,
1b...Measuring head, 1c...Work fixing part, 2
...Floating plate, 3,4...Measuring lever,
5, 5', 6, 6'...Parallel leaf spring, 5a, 6a...
...Space, 7, 8... Measuring head, 9... Push spring, 1
0...Detector, 10a...Differential transformer, 11...
...Rotating body, 12...Floating ball, 13
...Oil damper, 14...Rotation stopper, 15
... Motor, 16 ... Drive bevel gear, 17 ...
Driven bevel gear, 18... Confirmation disk, 19... Confirmation switch, 20... Protector, 21... Work, 22... Measuring stand, 23... Gauge holder, 2
4... Conveying claw, 25... Conveying chain, 26... Rotating cam, 27... Tension spring, 28... V-shaped notch, 29... Master gauge, 30... Holding hole,
31... Stopper, 32... Drive motor, 33...
...Side plate, 34... Board, 35... Bearing, 36...
Rotating shaft, 51a... Inner diameter measuring head, 51b...
Outer diameter measuring head, 52, 53...Measuring lever, 2
4...Tension spring, 55, 56...Measuring point, 57...
...Protector.

Claims (1)

[Claims for Utility Model Registration] 1. A measuring stand 22 for positioning the workpiece in order to measure the roundness of the inner or outer wall of the workpiece.
and a pair of measurement levers 3, 4, 52, 53 that are parallel to each other and extend in the direction of the measurement table, and have measurement elements 7, 8, 55, 56 that abut on the inner wall or outer wall of the workpiece. urging members 9 and 54 that apply urging force to each of the measuring levers to press each probe into contact with the work; a detector 10 that measures the differential movement of the pair of measuring levers;
protectors 20, 57 for protecting and positioning the measuring lever; an indexing device 1a for rotating the measuring lever and protector together by at least 180 degrees; and a correcting misalignment of the measuring lever by being connected to the indexing device. and a gauge holder 23 that holds a master gauge 29 and presses the workpiece or master gauge to the measuring position of the measuring stand, and each of the pair of measuring levers is supported by a parallel leaf spring 5, 5',
A roundness measuring device characterized in that the device is connected to the floating plate by 6 and 6'. 2. A pair of measuring levers 3, 4 are inserted into the hole of the workpiece, and the inner diameter of the hole is measured by bringing the probes 7, 8 at the tips of the measuring levers into contact with the inner wall of the hole by means of a spring 9. A circularity measuring device according to claim 1 of the utility model registration claim. 3 A pair of measuring levers 52 and 53 are used to measure the outer diameter of a cylindrical workpiece from outside the workpiece by bringing the probes 55 and 56 at the tips of the measuring levers into contact with the outer wall of the workpiece using a spring 54. A roundness measuring device according to claim 1 of the patent registration claim.