JPH065075Y2 - Rotating body runout measurement jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a jig for measuring the runout of a rotating body, for example, the main shaft of a machine tool.

[Prior Art] Conventionally, in order to measure the rotation accuracy of a spindle such as a lathe, a true sphere, which is a measured point, is mounted on the center of the spindle at the shaft end of the spindle, and the spindle is rotated in a non-contact type. The rotation accuracy of the main shaft is measured by detecting the radial displacement of the true sphere with a displacement sensor.

A conventional rotary body eccentricity measurement jig used for measuring such rotation accuracy is, for example, as shown in FIGS. 3 and 4, a jig main body mounted on a rotary body. 1'and a true sphere 15 'are fixed to the tip and the back is the jig body 1'
And the true sphere mount 2 ′ facing each other are engaged in the central part through a ball joint A composed of a ball and an opposing conical hole, and in the peripheral part, they are alternately arranged in a circumferentially equal distribution. The projecting bolt B1 and the pulling bolt B2 are engaged and assembled.

Then, the tensioning bolt B1 and the tensioning bolt B2 at the circumferential position are adjusted and rotated as appropriate to move the true ball mount 2'to the ball joint A.
Is oscillated about the fulcrum so that the center point of the true sphere 15 'is positioned on the center axis of the rotating body.

[Problems to be solved by the invention] In the conventional jigs for measuring the body runout, the axial adjustment displacements of the tension bolts B1 and the tension bolts B2 at the peripheral edge and the radial direction of the true sphere 15 ' The ratio to the displacement is the distance L ′ between the center axis of each bolt B1 and B2 and the center line of the ball joint A.
And the distance L ′ between the center point of the true sphere 15 ′ and the center point of the ball joint A, which is about 1: 1. Therefore, it is difficult to finely adjust the center point of the true sphere by adjusting the bolts B1 and B2.

This invention overcomes the drawbacks of such prior art.

[Means for Solving Problems] A rotary body runout measuring jig according to the present invention comprises a jig body having a spherical seat formed on the surface, and a spherical part having a true sphere on the surface and matching the spherical seat on the back. The spherical mount is mounted on the jig body so that the spherical surface is guided by the spherical seat so that it can be displaced and fixed, and the center point of the spherical surface is the spherical surface. The jig main body is provided with an adjusting device for adjusting and displacing the true spherical mount along the spherical seat.

[Operation] In the rotating body eccentricity measurement jig of the present invention, when the adjusting device of the jig body is operated and the true spherical mount is adjusted and displaced along the spherical seat, the center point of the true sphere becomes A small misalignment length is oscillated on the arm around the center point of the spherical seat / spherical portion.
By this adjustment operation, the center point of the true sphere is accurately positioned on the center axis of the rotating body, and the true sphere mount is fixed to the jig body.

The true sphere thus positioned is used as a point to be measured in the rotation accuracy measurement inspection of the rotating body.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In this embodiment, the spindle S of the machine tool is shown as a rotating body whose runout is measured. A jig for measuring a runout is mounted on the tip end surface of the main shaft S, and the jig for a runout is composed of a cylindrical jig body 1 with a flange and a true sphere mount 2.

In the jig body 1, a spherical seat 3 is formed in the center of the surface, and screw holes 4, 4 ... Are provided on the outer side in the axial direction in the circumferentially even distribution, and in the radial direction in the circumferentially uniform distribution on the outer peripheral surface. , That is, a support base portion 6 having four adjustment screw holes 5, 5 formed in a cross shape and a tightening bolt 7 are inserted with an adjustment gap. It is integrally formed from a flange portion 9 bored in the axial direction for distribution and a cylindrical protruding portion 10 protruding in the center of the rear surface of the flange portion that fits into the hollow hole H of the main shaft S when the jig for measuring the runout is attached. ing.

Further, as shown in FIG. 1, a stepped hole 12 is formed in the center of the jig body 1 in the axial direction in which an adjusting rod 11 including the head is loosely fitted with a play gap. The diameter of the cylindrical protruding portion 10 is such that there is an adjusting gap between the cylindrical protruding portion 10 and the inner peripheral surface of the hollow hole H of the main shaft S when fitted.

The spherical mount 2 has a spherical concave portion 13 for mounting a spherical shape at the center of the surface.
However, a spherical surface portion 14 that coincides with the spherical surface seat 3 of the jig body 1 is formed in the center of the back surface, and a true sphere 15 is adhered and fixed to the spherical concave portion 13, and further, the jig body is attached to the outer peripheral flange portion. 1 corresponding to the screw holes 4, 4, ..., The bolt holes 17, 17 ... into which the tightening bolt 16 is inserted with an adjustment gap, and the screw rod 18 in which the adjusting rod 11 is planted at the center of the spherical surface portion 14. Are respectively bored in the axial direction.

There is a slight misalignment between the center point C1 of the spherical surface portion 14 and the center point C2 of the true sphere 15.

The tip screw portion of the adjusting rod 11 inserted into the stepped hole 12 of the jig body 1 is screwed into the screw hole 18 of the true ball mounting base 2 to form the head of the adjusting rod 11 and the stepped portion of the stepped hole 12. A compression spring 19 is interposed between them. As a result, the spherical portion 14 elastically abuts on the spherical seat 3 and the true sphere mount 2 is movably integrated with the jig body 1.

The X-axis direction adjustment screws 20 and 20 'and the Y-axis direction adjustment screws 21 and 2 which are respectively screwed into the adjustment screw holes 5 arranged in a cross shape and face each other.
The tip of 1'abuts on the peripheral surface of the adjusting rod 11.

Tightening bolt 16 inserted in bolt hole 17 of spherical mount 2
Is screwed into the screw hole 4 of the jig body 1.

The operation and operation of the above-mentioned jig for measuring the runout will be described.

In the jig for measuring an eccentricity assembled as described above, the tightening bolt 7 inserted into each bolt hole 7 of the jig body 1 is screwed into the screw hole formed at the corresponding position of the end surface of the main shaft S. Then, the position of the jig for measuring the runout is adjusted so that the center point C2 of the true sphere 15 is substantially on the axis of the spindle, and the tightening bolt 7 is tightened to fix it to the end surface of the spindle S.

Next, the non-contact displacement meter M is installed close to the true sphere 15 from the direction perpendicular to the axis of the main axis, the main axis S is rotated, and the axial direction of the X-axis direction adjusting screws 20, 20 'is set to the non-contact displacement meter M. Positioning is performed so as to be parallel to the measurement direction, and the difference in distance between both sides of the true sphere 15 in the X-axis direction is measured. Next, true sphere 15
Similarly, the difference in distance between the two circumferential surfaces in the Y-axis direction is also measured.

By the way, when the X-axis direction adjusting screws 20 and 20 'are moved back and forth, the adjusting rod 11 is guided by the spherical seat 3 and the spherical surface portion 14, and the center point C1 of the spherical seat 3 and the spherical surface portion 14 is centered in the X-axis direction. The center point C2 of the true sphere 15 swings to the spherical seat 3 / spherical part 14 as well.
A small misalignment length d is pivotally displaced in the X-axis direction around the center point C1 of the arm. As for the swing displacement, the adjustment forward / backward length of the X-axis direction adjustment screws 20, 20 ′ is determined by the X-axis direction adjustment screws 20, 20 ′.
To the adjusting rod 11 and the center point C1 of the spherical seat 3 and spherical surface portion 14
It is reduced by the ratio (for example, 1/40) of the distance L to the distance L and the misalignment length d. Therefore, a very fine adjustment is made. It can be easily understood that the same applies to the Y-axis direction adjustment.

Therefore, the X-axis direction adjusting screws 20 and 20 'are moved back and forth so that the difference in the measured distances between the both sides of the true sphere 15 in the X-axis direction becomes zero. Y-axis direction adjusting screws 21 and 21 'so that the difference in the measured distance to both sides of the
Move each other back and forth.

This inspection and adjustment are repeated as needed.

Then, the tightening bolts 16, 16 ... Are tightened to fix the true sphere mount 2 to the jig body 1.

Thus, the center point C2 of the true sphere 15 is accurately located on the spindle axis, and the circumferential surface of the true sphere 15 is also equidistant from the spindle axis over the entire circumference.

The peripheral surface of the true sphere 15 positioned with respect to the main shaft S in this way is used as a measured point in the rotation accuracy measurement inspection of the main shaft S. That is, the rotation accuracy of the spindle is measured by detecting the radial displacement of the true sphere with a contact type displacement sensor or the like while the spindle is rotating.

[Advantage of device] According to the jig for rotating body eccentricity measurement according to the present invention, in adjusting the center point position of the true sphere with respect to the center axis of the rotating member,
Since the adjustment displacement of the true sphere mount due to the adjustment operation of the adjusting device is reduced by a large reduction difference and becomes the displacement of the true sphere, the center point position adjustment of the true sphere is performed accurately and in a short time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cross-sectional front view of a jig for measuring the rotational body eccentricity according to an embodiment of the present invention, and FIG. 2 is a measurement of the rotational body eccentricity according to the embodiment of the present invention. FIG. 3 is a side view of a jig for a rotary body, and FIG. 3 is a vertical sectional front view of an example of a jig for measuring a rotary body eccentricity according to a conventional technique. FIG. It is a side view. 1: Jig body, 2: True sphere mount 3: Spherical seat, 4, 18: Screw hole 5: Adjusting screw hole, 6: Bearing base part 7, 16: Tightening bolt, 8, 17: Bolt hole 9: Flange, 10: Cylindrical protrusion 11: Adjusting rod, 12: Stepped hole 13: Spherical recess, 14: Spherical part 15: True sphere, 19: Compression spring 20, 20 ': X axis direction adjusting screw 21,21 ′: Y-axis direction adjustment screw S: Spindle, H: Hollow hole M: Non-contact displacement meter C1: Center point (of spherical seat / sphere) C2: Center point of (true sphere) d: Misalignment length

Claims (1)

[Scope of utility model registration request] 1. A jig main body having a mounting means so as to be mounted on a rotating body in a substantially coaxial relationship, and a jig body having a spherical seat formed on the surface thereof, and a true sphere on the surface of the jig main body fitted to the spherical seat. The spherical mount is provided with a spherical mount each having a spherical surface; the spherical mount is mounted on the jig body so that the spherical part can be displaced and fixed by being guided by the spherical seat, and the center of the spherical center is The center of the spherical surface and spherical seat is slightly off center, and the jig body is equipped with a device for adjusting and displacing the true spherical mount along the spherical seat.