JP2557200B2 - Rotation angle measurement method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle measuring method for detecting a rotation angle of, for example, a turning table used in a grinding machine.

[0002]

2. Description of the Related Art Conventionally, a machine tool such as a cylindrical grinder is provided with a turning table, and a cylindrical outer peripheral surface of a cylindrical workpiece (workpiece) arranged on the turning table is ground. . Specifically, as shown in FIG. 8, the cylindrical grinding machine is provided with a turning table 2 on a sliding table 1, and on the turning table 2, a headstock 3 and a tailstock 4 are provided.
It has a structure in which and can be freely moved toward and away from each other. Chuck 3a, 4a is attached to each of the headstock 3 and tailstock 4, and the work 5 is sandwiched and held by each chuck 3a, 4a. The cylindrical grinder is
While rotating the work 5 by the driving force of the motor 6, the surface is ground by a grindstone (not shown).

By the way, the turning table 2 is arranged at a right angle to the traveling direction of the grindstone. Turning table 2 is shown in FIG.
As shown in (plan view), the rotary shaft 7 is configured to be rotatable about the rotation center 0 (arrow A). For example, the turning table 2 is engaged with the sliding table 1 by a fixing screw 2a. The fixing screw 2a penetrates the long hole 2b formed in the swivel table 2, and the swivel table 2 and the slide table 1
And are engaged. By turning the turning table 2 by a predetermined amount, a tapered surface can be processed during grinding. Further, the turning table 2 can normally turn about 7 degrees to the left and about 3 degrees to the right.

The turning amount (rotation angle) of the turning table 2 is
It is calculated based on the measurement result of the dial gauge 8. The dial gauge 8 is fixed by a protrusion 9 provided on the sliding table 1. The probe 8a of the dial gauge 8 has a protrusion 2c from the end of the turntable 2.
It is provided so as to be in contact with.

Here, the turning amount θ1 of the turning table 2 is
As shown in FIG. 9, the calculation of “θ1 = Tan ⁻¹ (L / R)” is based on the length R from the center of rotation 0 to the protrusion 2c of the turning table 2 and the distance L of the arc when turning. Calculated from the formula.

[0006]

In the conventional measuring method of the turning amount (rotation angle) of the turning table 2 as described above, firstly, a well-known calculation formula is used from the measurement result by the dial gauge 8. For example, it is necessary to calculate with a calculator (small computer). Therefore, a troublesome work such as operation of the dial gauge 8 or the calculator is required. Second,
There are various sizes of the cylindrical grinder, and it is necessary to change the scale interval of the dial gauge 8 according to the size of the radius R. Therefore, when high accuracy is required, a great deal of work is required. The mechanical measuring device such as the dial gauge 8 has a problem that the reliability is not always sufficient.

An object of the present invention is to provide a rotation angle measuring method capable of improving the efficiency of the measurement work of the rotation angle of a turning table or the like used in a grinding machine and improving the reliability.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a rotary table means provided with a magnetic scale member and a magnetic scale of the magnetic scale member are rotationally moved about a rotary shaft to detect the magnetic scale to detect a distance corresponding to an arc. In a rotation angle measuring device provided with a detection head means for outputting a signal, the rotation angle measuring method comprises the following steps. As a first step, a radius R, which is the distance from the rotation axis of the turning table means to the magnetic scale member, is set. As a second step, the distance L of the arc is calculated according to the detection signal output from the detection head means. As the third step, the rotation angle θ of the turning table means is calculated from the radius R and the arc length L using a predetermined calculation formula. As the fourth step, the calculated rotation angle θ is displayed as the measurement result.

[0009]

According to the present invention, there is provided a rotation angle measuring device comprising a turning table means provided with a magnetic scale member and a detection head means for detecting a magnetic scale of the magnetic scale member and outputting a detection signal corresponding to an arc distance. By the measuring method of sequentially executing the first to fourth steps,
For example, it becomes possible to automatically measure the rotation angle using a computer.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the configuration of the rotation angle measuring device according to the embodiment. In the embodiment, the case is applied to a grinding machine, and a sliding table 1 and a turning table 2 are provided. The swivel table 2 is engaged with the slide table 1 by a fixing screw 2a, and is configured so that one end portion 2d draws an arc with the rotary shaft 7 as the center of rotation 0 so as to freely swivel. The fixing screw 2a is attached, for example, penetrating an elongated hole 2b formed in the turning table 2. As a result, the turning table 2 turns on the sliding table 1 using the elongated hole 2b as a guide. Here, the sliding table 1 is provided with an adjusting screw 15, and the turning table 2 is rotated by turning the adjusting screw 15.

A holding member 11 for holding the magnetic scale 10 on which magnetic scales having equal intervals are formed is attached to one end 2d of the turntable 2 with screws 12a and 12b. The magnetic scale 10 is in a state of being provided on the peripheral portion of the one end 2d, and a magnetic scale is formed on a flexible ribbon-shaped base. This magnetic scale 1
0 is, for example, a scale of model JM1 series manufactured by Sokkisha Co., Ltd.

On the other hand, on the sliding table 1, the detection head 1 is provided at a position facing the magnetic scale 10 at a predetermined interval.
3 is provided. The detection head 13 is the magnetic scale 1.
A magnetic scale of 0 is detected, and a detection signal corresponding to the arc distance when the turning table 2 turns is output to the display unit 14 through the cable 13a.

As shown in FIG. 3, the display unit 14 has a panel provided with a display portion 14a made of, for example, a liquid crystal display and a keyboard 14b for data input. Further, as shown in FIG. 4, the display unit 14 includes a signal processing unit 14c and a central processing unit (CPU) 14d in addition to the display unit 14a and the keyboard 14b. The signal processing unit 14c includes an A / D conversion circuit that converts the detection signal output from the detection head 13 into digital data. The CPU 14d has a signal processing unit 14c.
Using the data (distance of the arc) input from, the turning amount (rotation angle θ) of the turning table 2 is calculated based on the calculation program stored in advance. The display unit 14a is a CP
The data calculated by U14d is displayed digitally.

Next, the operation of the embodiment will be described. First,
As shown in FIG. 2, the sliding table 1 of the grinding machine is attached to the machine body 20 so as to be movable in the left-right direction (arrow B). The turning table 2 provided on the sliding table 1 is configured to be turnable around a rotation shaft 7 as a rotation center. Here, a work to be ground is placed on the turning table 2, and the turning table 2 is turned as needed when the surface of the work is ground by a grindstone (FIG. 8). See).

When the revolving table 2 revolves, the magnetic scale 10 moves in a circular arc accordingly. The detection head 13 detects the magnetic scale of the magnetic scale 10 and outputs a detection signal corresponding to the arc distance (L in FIG. 5) to the display unit 14. The signal processing unit 14c of the display unit 14 converts the detection signal from the detection head 13 into digital data and outputs it to the CPU 14d.

The CPU 14d calculates in advance a calculation expression "θ = [L
/ (2πR)] · 360 ° ”is stored. Here, R is a radius when an arc is drawn with the center of rotation 0 as a reference, as shown in FIG. 5, and the magnetic scale 10 provided on the revolving table 2 from the rotating shaft 7 is used.
(See Figure 1). The value of this R is
CPU 14 as input data from the keyboard 14b in advance
given to d.

The CPU 14d uses the data (L) from the signal processing unit 14c and the data (R) from the keyboard 14b, and based on the above calculation program, the rotation angle θ.
Is calculated. The calculated rotation angle θ corresponds to the turning amount of the turning table 2. The display unit 14a has a CPU 14d.
The data of the rotation angle θ which is the calculation result output from is displayed digitally.

In this way, the rotation angle of the revolving table 2 such as a grinding machine can be measured, and the measurement result can be easily confirmed on the display unit 14a. In the present invention, the magnetic scale 10 and the detection head 13 are used as the main body of the measuring device.
The so-called magnetic rotary encoder is used. Therefore, unlike the conventional mechanical measuring device, the problem of easy failure can be solved and a highly reliable device can be configured. Further, for example, by using the magnetic scale 10 made of a flexible ribbon-shaped base, the length of the one end 2d of the turning table 2 is increased,
The present invention can be applied even when the rotation angle of the turntable 2 is relatively large. In other words, by using the magnetic scale 10 on which the magnetic graduations with equal intervals are previously formed,
The magnetic rotary encoder can be easily configured for the revolving table 2 having different radii R.

Further, since the rotation angle of the turntable 2 can be automatically calculated and displayed on the display unit 14a, it is possible to omit the conventional work of a measuring operator using a calculator or the like. You can Therefore, it is possible to simplify the entire measurement work and significantly suppress the occurrence of measurement errors due to an erroneous operation by the measurement operator.

FIG. 6 is a diagram showing a modification of the embodiment.
In this modification, a wiper member 13a made of, for example, a rubber member is attached to the side surface of the detection head 13. The wiper member 13a has a magnetic scale 1 at its tip.
It comes into contact with or approaches the surface of 0 and slides relative to the magnetic scale 10 when the revolving table 2 makes a rotational movement.

With such a wiper member 13a, for example, when minute metal powder or the like generated by the grinding process adheres to the surface of the magnetic scale 10, the metal powder or the like can be removed. Therefore, magnetic scale 1
It is possible to reliably prevent a situation in which the detection head 13 malfunctions due to the metal powder or the like attached to the surface of No. 0.

[0022]

As described above in detail, according to the present invention, it is possible to reliably measure the rotation angle of a turning table or the like used in a grinder, for example, without using a mechanical device. Therefore, highly reliable measurement results can be obtained. Further, since the measurement result can be automatically calculated and displayed, the troublesome measurement work can be eliminated and the efficiency of the measurement work can be improved. Since it can be easily applied to turning tables having different radii, it has a wide range of applications.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a rotation angle measuring device according to an embodiment of the present invention.

FIG. 2 is a side view according to the embodiment.

FIG. 3 is a block diagram showing a configuration of a display unit according to the embodiment.

FIG. 4 is a block diagram showing a configuration of a display unit according to the embodiment.

FIG. 5 is a conceptual diagram for explaining the operation of the embodiment.

FIG. 6 is a view for explaining a modified example of the same embodiment.

FIG. 7 is a diagram for explaining the configuration of a conventional rotation angle measuring device.

FIG. 8 is a diagram for explaining the configuration of a conventional rotation angle measuring device.

FIG. 9 is a conceptual diagram for explaining a conventional rotation angle measuring method.

[Explanation of symbols]

1 ... Sliding table, 2 ... Revolving table, 10 ... Magnetic scale, 13 ... Detection head, 14 ... Display unit.

Claims (1)

(57) [Claims] 1. A plate-like member capable of rotating around a rotation axis.
It consists of a member, and it makes a rotational movement about the rotation axis
Magnetic scales at equal intervals on the periphery of a circular arc
Swivel table provided with a magnetic scale member formed with
MeansAtProvided in proximity to the peripheral edge of the swivel table means
The magnetic scale of the magnetic scale member to detect the circle
Equipped with a detection head that outputs a detection signal corresponding to the arc distance
eFor measuring the rotation angle of the turning table means
Rotation angle measuring deviceThe method of measuring the rotation angle of  The distance from the rotation axis to the magnetic scale member
The rotary table means is rotated to draw the arc.
Set the first numerical data corresponding to the radius
Step and the detection table when the rotary table means makes a rotary motion.
Distance of the arc according to the detection signal output from the head means.
Calculating the second numerical data corresponding to the separation, the first numerical data and the second numerical data given
TaWhenWas used to make a rotational movement about the rotation axis.
Third corresponding to the rotation angle of the turning table means
Calculating the numerical data of, and using the calculated third numerical data, the turning
Step for displaying measurement result of rotation angle of table means
A method for measuring a rotation angle, which comprises: