JPH1010277A - Measuring device for inner circumferential surface projection dimension of cylindrical body to be inspected - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly and speedily measure the height of inner circumferential surface projection with respect to the reference of outer circumferential surface of a cylindrical to-be-inspected body by holding the cylindrical body with horizontal reference surface and a vertical reference surface and making a gage head touching the inner circumference projection on the body a cylindrical shape and providing a detector for detecting the up and down motion of the gage head. SOLUTION: The inner circumferential surface projection A0 of a to-be-inspected body A is shifted from a horizontal reference surface so as to hold at the horizontal reference surface of a horizontal reference stage 13 and the vertical side reference surface 15 of a vertical reference stage 16. Then, it is moved to a detector 18 direction along the horizontal reference surface and inserted making the gage head 17 softly touch a cylindrical inner circumferential surface of the body A. When the tip end of the body A touches the vertical reference surface 14 at the end, it is stopped. This position of the gage head 17 is the thickness of the body A. When the body A is rotated clockwise and the gage head 17 comes above the projection part A0 , the gage head 17 is lifted up to the maximum height, which is detected with an up and down motion detector 25 by way of a guide rail 19 and a detection stage 21. This detection signal is sent to a record indicator 26, which is displayed with a peakhold function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the size of a projection on the inner peripheral surface of a cylindrical object to be inspected, and more particularly to a device for measuring a cylindrical object to be inspected on a horizontal reference plane of a horizontal reference stand and a vertical reference plane of a vertical reference stand. The present invention relates to an apparatus for measuring the size of an inner peripheral surface protrusion of a cylindrical object to be inspected, which measures the height of an inner peripheral surface protrusion of the cylindrical object to be inspected, with reference to the outer peripheral surface of the cylindrical object to be inspected.

[0002]

2. Description of the Related Art Generally, the positioning of fuel rods of a fuel assembly is performed by the height of a projection formed on the inner peripheral surface of a cylindrical body constituting a spacer. Therefore, the height of the projection on the inner peripheral surface of the cylinder is always strictly measured.

Incidentally, a projector or an automatic inspection device is used for measuring the projection on the inner peripheral surface of the cylindrical body.

In the measurement by the projector, the maximum actual dimension of the outer peripheral surface and the top dimension of the inner peripheral surface projection are accurately determined due to the inclination of the inspected object, sagging of a measuring portion generated during processing, an error between operators, and low repeatability. There was a problem that it was difficult to measure.

[0005] Therefore, in such a projector, it has been desired to develop a measuring apparatus in which the object to be inspected is set upright and the maximum physical size of the outer peripheral surface is used as an accurate reference.

In the measurement by the automatic inspection apparatus, the object to be inspected is set as close to vertical as possible, the outer surface of the object to be inspected is fixed so as to be sandwiched from two directions, and the measuring element is brought into contact with the top of the protrusion on the inner peripheral surface. However, there is a problem that the measurement accuracy is lowered due to the inclination of the test object and the deviation of the reference of the outer peripheral surface.

[0007] Therefore, in such an automatic inspection apparatus, it has been desired to develop a measurement apparatus in which the fixing of the object to be inspected is accurately set at a point with respect to the outer peripheral surface of the object to be inspected.

Therefore, in order to solve the above-mentioned problems, the present invention holds a cylindrical object to be inspected by a horizontal reference plane and a vertical reference plane, and causes variations in the inclination and dimensions of the cylindrical object during measurement. To obtain an inner peripheral surface protrusion dimension measuring device for measuring the inner peripheral surface protrusion portion based on the maximum physical size of the outer peripheral surface of the cylindrical inspected object without being affected by The purpose is to do so.

Further, the present invention improves the contact accuracy by making the contact element in contact with the inner peripheral projection of the cylindrical object to be inspected into a cylindrical shape and making contact with the inner peripheral projection by point contact. The purpose of recording the maximum value obtained at the top of the protrusion is to provide a measuring device for measuring the protrusion of the inner peripheral surface of the cylindrical test object.

[0010]

According to the present invention, there is provided a horizontal reference base for holding a cylindrical inspection object having a projection on an inner peripheral surface by a horizontal reference surface, and the cylindrical inspection object in relation to the horizontal reference base. A vertical reference base having a vertical reference surface against which the outer surface of the body abuts; and a vertical reference base inserted into the cylinder of the cylindrical object to be inspected and moved up and down in response to contact with the projection of the cylindrical object to be inspected. And a detector for detecting the vertical movement of the tracing stylus.

Further, the present invention is characterized in that the tracing stylus is constituted by a cylindrical body.

Further, the present invention is characterized in that the detector is a recording display.

[0013]

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

A measuring table 12 placed on a foundation 11 is provided in the apparatus 10 for measuring the projection of the inner peripheral surface of a cylindrical object to be inspected according to the present invention. A horizontal reference table 13 is mounted on the upper surface of the measurement table 12 so as to regulate and hold the horizontal outer peripheral surface of the cylindrical test object A having the inner peripheral surface projection AO as a reference surface.

A horizontal reference table 13 is provided on the upper surface of the measurement table 12.
End vertical reference plane 14 and side vertical reference plane 1
The vertical reference base 16 having the reference numeral 5 is attached, and the vertical reference surface of the cylindrical test object A is regulated and held as a reference plane.

The cylindrical test object A is adapted to be rotated about its central axis manually or by another appropriate driving method.

On the upper surface of the measuring table 12, a cylindrical measuring element 17 parallel to the horizontal reference table 13 and the vertical reference table 16 is provided.
Is attached. The detection device 18 is provided with a vertical column 20 provided with a guide rail 19 extending in a vertical direction, and a detection table 21 to which the tracing stylus 17 is attached moves up and down along the guide rail 19.

The tracing stylus 17 is usually arranged on the horizontal reference of the horizontal reference table 13 and is set as the origin position of the maximum outer peripheral surface of the cylindrical test object A. The tracing stylus 17 is inserted into the inside of the cylinder of the cylindrical test object A, and lightly contacts the inner peripheral surface of the cylindrical test object A to measure the height of the inner peripheral surface protrusion AO, that is, the dimension. Has become.

On the upper surface of the measuring table 12, a measuring device 22 for measuring the vertical movement of the detecting table 21 is mounted. The measuring device 22 is provided with a supporting column 23 and a supporting arm 24 extending upward, and the supporting arm 24 is provided with a vertical movement detector 25 such as a magnescale for measuring the vertical movement of the detection table 21 and a recording display 26 thereof. Installed.

A description will be given of a case where the height of the inner peripheral surface protrusion AO of the cylindrical test object A is measured by using the measuring device 10 for measuring the inner peripheral surface protrusion of the cylindrical test object having such a configuration.

First, the projection AO on the inner peripheral surface of the cylindrical test object A
Is held on the horizontal reference plane of the horizontal reference base 13 and the side vertical reference plane 15 of the vertical reference base 16 so as to be shifted from the horizontal reference plane of the horizontal reference base 13. Next, this cylindrical inspection object A
Is moved in the direction of the detector 18 along the horizontal reference plane of the horizontal reference table 13, and the tracing stylus 17 is inserted while lightly contacting the inner peripheral surface of the cylindrical object A to be inspected. Then, when the tip of the cylindrical test object A comes into contact with the end vertical reference plane 14, the movement is stopped.

In this way, the position of the cylindrical damage inspection object A is not shifted and is correctly held in contact with the horizontal reference stand 13 and the vertical reference stand 16. The position of the tracing stylus 17 is the thickness of the cylindrical inspection object A.

When the position of the cylindrical test object A is determined, the cylindrical test object A is rotated clockwise manually or by another method. The rotation probe of the cylindrical test object A is vertically moved along the inner peripheral surface thereof. The detection base 21 moves up and down along the guide rail 19 in response to the vertical movement of the tracing stylus 17, and the vertical movement of the detection base 21 is detected by the vertical movement detector 25, and this is displayed on the recording display 26.

During this detection, the tracing stylus 17 moves to the inner peripheral surface protrusion AO.
When it comes to the top, the point contact raises the tracing stylus 17 to the maximum height. This height is detected by the vertical motion detector 25 and the detection signal is sent to the recording display 26. Record display 2
In step 6, the maximum value is recorded and displayed by the peak hold function. Therefore, the height, that is, the dimension, of the inner peripheral surface projection AO of the cylindrical inspection object A is accurately and quickly read.

According to this reading, if the height of the inner peripheral surface projection AO of the cylindrical inspection object A is the reference size, it is processed as a pass product, and if it is outside the reference size, it is processed as a non-pass product.

The following results were obtained by comparing the measurement using the apparatus 10 for measuring the projections on the inner peripheral surface of the cylindrical object to be inspected with the measurement using a conventionally used projector.

The measurement time per unit is 2.9 minutes / unit in the case of a projector, but is 1.9 minutes / unit in the present measuring apparatus 10, and the number of measurements per day is in the case of a projector. Although the number was 42 / day, the measurement device 10 could increase the number to 46 / day.

For this reason, the number of processings per day is only 8.333 / day in the conventional projector, but the measuring apparatus 10 can increase the number of processings to 9.166 / day in order to improve the efficiency of the measurement / inspection. did it.

In the case of the conventional projector, the measurement accuracy was only 0.229 mm.
Can be improved to 0.005 mm, and the repetition accuracy was 0.012 mm in the case of the projector, but could be improved to 0.005 mm in the present measuring apparatus 10 and the accuracy could be improved.

[0030]

According to the present invention, there is provided a horizontal reference base for holding a cylindrical inspection object having a projection on an inner peripheral surface by a horizontal reference surface, and an outer surface of the cylindrical inspection object in relation to the horizontal reference base. A vertical reference base having a vertical reference surface to be abutted, and a stylus that is inserted inside the cylinder of the cylindrical test object and moves up and down in accordance with the contact with the protrusion of the cylindrical test object, And a detector for detecting the vertical movement of the tracing stylus, thereby accurately and quickly measuring the height of the projection on the inner peripheral surface of the cylindrical test object with reference to the outer peripheral surface of the cylindrical test object. be able to.

Further, since the measuring element of the present invention is formed of a cylindrical body, the measuring element can be point-contacted with the inner peripheral surface projection of the cylindrical test object, and the dimension of the top of the inner projection can be measured accurately. .

Further, since the detector of the present invention is a recording display, the maximum value of the projection on the inner peripheral surface of the cylindrical test object can be recorded with a peak hold function and read accurately. .

[Brief description of the drawings]

FIG. 1 is a front view showing, in cross section, a part of an apparatus for measuring the size of a projection on an inner peripheral surface of a cylindrical inspection object of the present invention.

FIG. 2 is a side view in which a part of FIG. 1 is removed.

FIG. 3 is a plan view in which a part of FIG. 1 is removed;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Measurement device for protrusion of inner peripheral surface of cylindrical object to be inspected 11 Foundation 12 Measurement table 13 Horizontal reference table 14 End vertical reference plane 15 Side vertical reference plane 16 Vertical reference table 17 Measuring element 18 Detector 19 Guide rail 20 Vertical Pillar 21 Detection stand 22 Measuring instrument 23 Support pillar 24 Support arm 25 Vertical motion detector 26 Record display

Claims (3)

[Claims] 1. A horizontal reference base for holding a cylindrical inspection object having a projection on an inner peripheral surface by a horizontal reference surface, and an outer peripheral surface of the cylindrical inspection object is brought into contact with the horizontal reference table. A vertical reference base having a vertical reference surface to be measured, a measuring element inserted into the cylinder of the cylindrical object to be inspected, and moved up and down in accordance with contact with the projection of the cylindrical object to be inspected; A detector for detecting vertical movement of a child, comprising: 2. An apparatus according to claim 1, wherein said tracing stylus is formed of a cylindrical body. 3. An apparatus according to claim 1, wherein said detector is a recording display.