JP2001108425A - Method and apparatus for measuring end face of pin having microdiameter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the perpendicularity at the end of a pin having a microdiameter being used as a gauge pin quickly, accurately and inexpensively. SOLUTION: The end face P2 of a columnar pin P is abutted against a stopper 30 while applying a rotational force to the circumferential side face P1 thereof and displacement of the end face P2 of the turning pin P from the center is measured by means of a displacement sensor L. Perpendicularity of the end face P2 of the pin P is then measured based on the displacement. The measuring apparatus comprises a base 10 for supporting the circumferential side face P1 of the columnar pin P, a rotary belt 20 for imparting a rotational force to the pin P by coming into pressure contact with an upper part of the circumferential side face P1 of the pin P supported horizontally on the supporting base 10, a stopper 30 abutting against the end face P2 of the turning pin P, and a sensor L for measuring the displacement of the end face P2 of the turning pin P from the center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end face measuring method and a measuring apparatus for measuring an extremely small diameter pin.
The present invention relates to a method and an apparatus for measuring the end face of a pin having an extremely small diameter, which measures the perpendicularity of the end face of the pin having a diameter of about 7 mm.

[0002]

2. Description of the Related Art Conventionally, a measuring method using an electric micrometer has been known as a method for measuring an end of a pin. This electric micrometer is, for example, a method of measuring the perpendicularity of the end face of a spindle shaft of a hard disk by measuring the displacement of a stylus in contact with the end face of the shaft when measuring the perpendicularity of the end face. According to this measuring method, for example, it is possible to measure a spindle shaft end face having a diameter of about 3 mm and a length of about 15 mm.

On the other hand, as a field in which an extremely small diameter pin is used, there is a guide pin used for an MT connector of optical fiber information communication technology. This guide pin has an outer diameter
An ultra-small pin with a diameter of 0.7mm and a total length of about 11.4mm.It is mainly used for connecting MT connectors.
It is machined to an accuracy of 5 μm to 2 μm.

[0004] Further, with the use of such an ultra-small diameter pin, the need for a gauge pin for improving the use accuracy of the ultra-small diameter pin is increasing. This type of gauge pin is required to be, for example, an extremely small diameter pin formed with the same size and accuracy as the guide pin, and having a higher right-angle accuracy at the pin end.
Then, by utilizing the high-precision right-angled end surface, the use accuracy of another ultra-small diameter pin is improved.

[0005]

In a conventional measuring method using an electric micrometer, a method in which a stylus is brought into contact with an end face of a shaft for measurement is used.
Although it is possible to measure the end surface of the spindle shaft, the contact pressure of the stylus is impeded, the outer diameter is 0.7 mm, and the total length is 11.4.
It has not been possible to accurately measure the end face of a very small diameter pin that is as light as about mm. In addition, at present, no method or device has been established for quickly and accurately measuring the end of an extremely small diameter pin.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problem, and is an end face measurement of an extremely small-diameter pin which can quickly and accurately measure the end right angle accuracy of an extremely small-diameter pin used for a gauge pin or the like. It is intended to provide a method and a measuring device.

[0007]

In order to achieve the above object, a first means of the present invention is to provide a horizontally supported cylindrical pin P.
The pin P end surface P2 is brought into contact with the stopper 30 while applying a rotational force to the peripheral side surface P1, and a displacement value at a position shifted from the center of the rotating pin P end surface P2 is measured by the displacement sensor L.
There is a method of measuring the squareness of the end surface P2 of the pin P from the measured displacement value.

[0008] The second means is a cylindrical pin P peripheral side surface P1
, A rotating belt 20 which presses against the upper side of the peripheral surface P1 of the pin P on the horizontally supported support 10 to apply a rotational force to the pin P, and an end surface P2 of the rotating pin P And a displacement sensor L for measuring a displacement value at a position shifted from the center of the rotating pin P end surface P2.

The displacement sensor L of the third means uses a non-contact type laser displacement meter which irradiates a laser L1 to a position shifted from the center of the rotating pin end face. in this case,
In order to avoid positional interference with the stopper, it is preferable to irradiate from a 45 degree direction.

The support base 10 of the fourth means is to fix a plurality of spheres such as ruby balls 11 which are hard and have a small coefficient of friction and support the pin P peripheral side surface P1.

The rotating belt 20 of the fifth means is mounted on the support table 1.
0 while urging the pin P on the
Rotating the peripheral side surface of the vehicle is a means for solving the problem.

[0012]

Embodiments of the present invention will be described below. The basic configuration of the measuring device of the present invention includes a support 10, a rotating belt 20, a stopper 30, and a displacement sensor L (see FIG. 1).

The support base 10 has a cylindrical pin P peripheral side surface P1.
The pin P to be measured is horizontally supported, and the pin P on the support base 10 is rotated by a rotating belt 20 described later (see FIG. 3). Therefore, it is necessary to reduce the coefficient of friction between the rotating pin P and the support 10 as much as possible.
Therefore, a plurality of hard ruby balls 11 having a small coefficient of friction are fixed to the upper surface of the support base 10, and the pin P
(See FIG. 4) so as to support the peripheral side surface P1 at a point. The illustrated ruby ball 11 shows a state where four balls are used. The ruby ball 11 may be changed to another material as long as it is hard and has a small friction coefficient.

The rotating belt 20 is provided with a pin P on the support 10.
Is rotated (see FIG. 1). The rotating belt 20 is pressed against the upper portion of the peripheral side surface P1 of the pin P to
It is necessary to apply a rotational force to the stopper 30 and at the same time contact the stopper 30. Then, in order to generate a thrust motion on the pin P, the rotating belt 20 is caused to run at a slightly greater angle than the orthogonal state with respect to the peripheral side surface P1 of the pin P,
By always bringing the end face P2 of the pin P into contact with the stopper 30, only the displacement of the end face can be measured (see FIG. 2).

The stopper 30 contacts the end face P2 of the pin P, and the end face P2 rotates at the position of the stopper 30 (see FIG. 3). The displacement position of the rotating end face P2 is measured by the displacement sensor L (see FIGS. 2 and 3).

The displacement sensor L has a rotating pin P end face P
The displacement value at the position deviated from the center of 2 is measured (see FIG. 5). The illustrated displacement sensor L uses a non-contact laser displacement meter that irradiates a laser L1. Since the non-contact type laser displacement meter has high measurement accuracy and is non-contact type, the non-contact type laser displacement meter is not affected by the measurement pressure and is most suitable for the measurement of an extremely lightweight pin P. According to the displacement sensor L, a position deviated from the center of the rotating pin P end surface P2 is irradiated with the laser L1, and a change position of this position is measured.

The measuring method of the present invention is performed as follows using the above-described measuring device. That is, the columnar pin P is horizontally supported on the support base 10 (see FIG. 3). Next, pin P
The pin P end surface P2 is brought into contact with the stopper 30 while applying a rotational force to the peripheral side surface P1 by the rotary belt 20. Further, a displacement value at a position deviated from the center of the rotating pin P end surface P2 is measured by the displacement sensor L, and the squareness of the pin P end surface P2 is measured from the measured displacement value. In this embodiment, since a non-contact type laser displacement meter is used, the measured value measures the amplitude at the measured position from the distance until the laser L1 hits the measured position on the end face P2 (see FIG. 2). Then, the squareness of the end face P2 is derived from the following equation from this amplitude. The measuring method and the measuring apparatus according to the present invention are not limited to the measurement of a pin having a very small diameter, but may be used for the measurement of a thick pin such as the spindle shaft of a hard disk described above.

[0018]

## EQU1 ## Squareness (μm) = amplitude × diameter of end face P2 / diameter of measured position of end face P2 × １ ／ Then, based on the data of FIG. 6 obtained by the measurement method shown in FIG. Deriving the angle gives:

[0019]

[Formula 2] 1.52 μm × 0.7 / 0.5 × 1/2 = 1.06 μm As a result, the perpendicularity of the end face P2 of the pin P shown in FIG.
It can be seen that it was detected as μm.

[0020]

According to the present invention, the above-mentioned configuration achieves the original object.

That is, according to the measuring method of the present invention, an accurate rotation is given to the pin outer diameter reference, and only the amount of deflection of one rotation of the pin is extracted, so that the end of the very small diameter pin used as a gauge pin or the like. It has become possible to measure the right angle accuracy quickly and accurately.

Further, in the measuring device according to the second aspect, the stopper 30 is always used so that the pin does not move in the axial direction.
The mechanism for contacting the sample allows accurate measurement in a very short time.

Since a non-contact type laser displacement meter is used as the displacement sensor L according to the third aspect, unlike a conventional contact type measuring device, a lightweight pin becomes unstable due to the influence of a measuring pressure, Since there is no possibility that harmful scratches or the like are generated from the friction of the portion and the surface shape of the end face, there is no possibility of adversely affecting high-precision measurement, the extremely lightweight pin P can be accurately measured.

Since the peripheral surface P1 is supported by the hard sphere having a small friction coefficient according to the fourth aspect, the friction coefficient between the peripheral surface P1 and the support base 10 generated when the pin P rotates is reduced, and the rotation is smooth. This allows extremely accurate measurements.

The pin P is urged toward the stopper 30 by the rotating belt 20 according to the fifth aspect, and the peripheral side P is urged.
It became possible to give rotation to 1. As a result, efficient measurement can be performed with a simple system, and the manufacturing cost of the measuring device of the present invention can be set at low cost.

As described above, according to the present invention, it is possible to quickly and accurately measure the right angle accuracy of an end portion of an extremely small diameter pin used for a gauge pin or the like at a low cost, and various industrially useful various measures can be obtained. It is effective.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of the measuring apparatus of the present invention.

FIG. 2 is an enlarged plan view of a main part of the measuring device of the present invention.

FIG. 3 is an enlarged side view of a main part of the measuring device of the present invention.

FIG. 4 is an enlarged sectional view showing a ruby ball of the measuring device of the present invention.

FIG. 5 is a conceptual diagram showing a state in which a displacement value of a measured position is measured by the measuring method of the present invention.

FIG. 6 is a chart in which a displacement value of a position to be measured is output by a non-contact laser displacement meter in the measuring apparatus of the present invention.

[Explanation of symbols]

 P Pin P1 Peripheral side surface P2 End surface L Displacement sensor L1 Laser 10 Support base 11 Ruby ball 20 Rotating belt 21 Synchronous motor 30 Stopper

Claims (5)

[Claims] A pin end face is brought into contact with a stopper while applying a rotational force to a circumferentially supported cylindrical pin peripheral side face, and a displacement value at a position deviated from the center of the rotating pin end face is measured by a displacement sensor. And measuring the squareness of the pin end face from the measured displacement value. 2. A support base for supporting the peripheral surface of the cylindrical pin at a point, a rotating belt for pressing the upper portion of the peripheral surface of the pin on the horizontally supported support surface to apply a rotational force to the pin, and rotating. An end face measuring device for an extremely small diameter pin, comprising: a stopper that abuts on an end face of a pin; and a displacement sensor that measures a displacement value at a position deviated from the center of the rotating pin end face. 3. The end face measuring device for an extremely small diameter pin according to claim 2, wherein the displacement sensor uses a non-contact type laser displacement meter that irradiates a laser to a position deviated from the center of the rotating pin end face. 4. The end face measuring device for a pin having a very small diameter according to claim 2, wherein the support table supports a plurality of hard spheres having a small coefficient of friction and supports a peripheral surface of the pin. 5. The end face measuring device for an extremely small diameter pin according to claim 2, wherein the rotating belt rotates the peripheral side surface of the pin while urging the pin on the support base toward the stopper.