JPH0755406A - Flatness measuring instrument - Google Patents

Abstract

(57) [Summary] [Purpose] To enable continuous and easy change of measurement span, and to enable accurate measurement even for DUTs with low strength and hardness. [Structure] Two contacts 12 and one contact 12 located on both sides of a measuring element 13b are attached to carriers 32 and 33 which are movably attached to a main body 31, respectively. Body 31
In the central portion of each surface parallel to the arrangement direction of the measuring element 13b and the contact element 12, concave portions 34, 3 are formed along the arrangement direction.
5, 36, 37a, 37b are respectively formed, and the main body 31
To reduce the weight of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flatness measuring instrument used for flatness measurement or sphericity measurement, for example, in flattening or spherical working.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional flatness measuring instrument of this type has a rectangular parallelepiped main body 11 which is provided on one side in the longitudinal direction.
One contact 12 is attached, and one contact 1 is provided on the other side.
2 is attached, and a dial gauge 13 is attached between these two contacts 12 and one contact 12.

The dial gauge 13 is attached to the main body 11 by inserting a sleeve 15 into an attachment hole 14 formed in the main body 11.
Through the stem 13a of the dial gauge 13,
This is performed by screwing a screw 17 into a screw hole 16 formed from the side surface of the main body 11 so as to open to the mounting hole 14 and pressing and fixing the stem 13a to the main body 11 via the sleeve 15 at the tip thereof. The gauge head 13b of the dial gauge 13 projects from the bottom surface 11a of the main body 11 and
It can be moved back and forth in the axial direction of a.

One end of the shaft-shaped contactor 12 is tapered and a minute ball is attached to the tip thereof, while a screw is formed on the peripheral surface on the other end side. Contact 1
2 is a bolt 18 having a screw hole formed on the tip surface of the screw portion.
The screw hole 1 formed in the main body 11 is screwed into the screw hole of the
By being screwed to the shaft 9 and fastened with the nut 21, the tip end side with the ball is projected from the bottom surface 11 a of the main body 11 and fixed to the main body 11.

A plurality of screw holes 19 are formed in the main body 11 so that the mounting position of the contact 12 can be changed in accordance with the size of the surface to be measured, that is, the flatness (sphericity) measurement span can be adjusted. Are formed. In this example, on the side where the two contacts 12 are attached, there is 5
A total of 10 screw holes 19 are formed in the width direction, and two screw holes 19 are formed in the longitudinal direction of the main body 11 on the other side to which one contact 12 is attached. ing. The ten screw holes 19 are two sets in the width direction of the main body 11, and the two contacts 12 are attached to the set.

To measure the flatness by the flatness measuring device 22, the main body 11 to which the three contacts 12 are attached according to the size of the surface to be measured is first placed on a surface plate constituting a reference plane. The tip of the contact piece 12 and the measuring piece 13b are arranged in contact with each other, and the dial indicator 1 of the dial meter 13 is arranged.
3c is zero-calibrated, and then the zero-calibrated flatness measuring instrument 22 is placed on the surface to be measured to read the pointer amount of the dial indicator 13c, that is, the displacement amount of the probe 13b from the reference plane. Done.

[0007]

As described above, the conventional flatness measuring instrument 22 can adjust the measurement span in accordance with the size of the surface to be measured, but the adjustment is made in the main body 11 in advance. Since a suitable one is selected from the formed plurality of screw holes 19 and the contact 12 is mounted at that position, the measurement span cannot be continuously adjusted, that is, with respect to the surface to be measured. There is a risk that the measurement span cannot be adjusted optimally, and changing the position of the contact 12 is troublesome, such as once removing the bolt 18 to which the contact 12 is attached from the main body 11 and then reattaching it. Was becoming.

Further, since the main body 11 having a rectangular parallelepiped shape has a considerable weight, for example, when the strength of the measured object is small, the measured object is deformed by the weight, that is, the measured surface is deformed. If the flatness cannot be accurately measured and the hardness of the surface to be measured is small, the contact 1
There is a problem that the surface to be measured is damaged by the large contact pressure of 2 and the flatness cannot be accurately measured.

The object of the present invention is to solve these problems of the prior art, to change the measurement span continuously and easily, and to measure the flatness of an object having a small strength and hardness. An object of the present invention is to provide a flatness measuring instrument capable of accurately performing.

[0010]

According to the present invention, a probe is attached to a main body so as to be movable back and forth with respect to a surface to be measured, and two contactors are projected from the bottom surface of the main body on one side of the probe.
On the other side of the measuring element, project one contact from the bottom surface of the main body, place the main body by bringing the tips of these contacting elements into contact with the surface to be measured, and measure the flatness of the displacement of the measuring element indicated by the dial indicator. In the container, a carrier is attached to the main body so as to be movable in the arrangement direction of the measuring element and the contact element, and one of the two contact elements and one contact element is attached to the carrier, and each surface parallel to the arrangement direction of the main body. A concave portion is formed in the central portion along the arrangement direction.

[0011]

According to the present invention constructed as described above, the position of the contact is continuously changed by moving the carrier, and the weight of the main body is reduced.

[0012]

FIG. 1 shows an embodiment of the present invention. The parts corresponding to those of the conventional flatness measuring device 22 shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. The dial gauge 13 is attached to the middle portion of the main body 31 in the longitudinal direction, and the probe 13b thereof is freely movable back and forth with respect to the surface to be measured. The two contacts 12 and the one contact 12 which are respectively projected from the bottom surface 31a of the main body 31 on one side and the other side of the measuring element 13b are the carrier 32,
It is attached to the main body 31 via 33.

A recess is formed in the center of each surface of the main body 31 parallel to the arrangement direction of the contact 12 and the measuring element 13b, along the arrangement direction. In this example, the bottom surface 31a of the main body 31 and the recesses 34, 35, 36 formed on both side surfaces 31b, 31c are trapezoidal in cross section, while the top surface 31d of the main body 31 has a mounting hole 1
A pair of concave portions 37a, 37b having a rectangular cross section are formed so as to sandwich the groove 4. The stem 13 of the dial gauge 13
The screw hole 16 used for fixing a to the main body 31 is formed so as to penetrate between the recess 37b and the mounting hole 14, and
A large-diameter hole 38 is formed in a portion of the side surface 31c side facing the screw hole 16 so that the screw 17 can be attached and screwed.

The carrier 32 includes a slider 39 and a stopper 4.
1 and the screw 42 are assembled and configured. Slider 3
9 is a convex portion 3 at one longitudinal end of one plate surface of the plate-like body 39a.
9b and a convex portion 39c are integrally formed on the other end of the plate member 39, and two screw holes 43 for attaching the contact 12 are formed in the plate-like body 39a so as to be arranged in the longitudinal direction. The tip of the convex portion 39b is bent inward, and the plate-like body 39a
With one plate surface of the main body 31 in contact with the bottom surface 31a,
It can be brought into contact with a part of the inner slope of the recess 35 of the main body 31 on the side of the bottom surface 31a.

The stopper 41 is formed in a substantially U shape, and slopes are formed by C chamfering at both ends of the outer surface of one leg of the U shape, and these slopes 41 a are the recesses 36 of the main body 31. A part of the inner slope on the bottom surface 31a side and a corner on the upper surface 31d side of the recess 36 can be brought into contact with each other. A screw hole 44 is formed in the other leg of the U-shape of the stopper 41, and when the protrusion 39c of the slider 39 is inserted from the U-shaped opening side of the stopper 41, the screw 42 is outside the stopper 41. The screw 32 inserted into the screw hole 44 is inserted into the screw hole 44, and the tip of the screw 42 is rotatably locked to the convex portion 39c to assemble the carrier 32.

The carrier 33 includes a slider 45 and a stopper 4.
1 and the screw 42 are assembled and configured similarly to the carrier 32. The slider 45 is different from the slider 39 only in that it has one screw hole 43 for attaching the contact 12, and the other shapes are the same as those of the slider 39. Two screw holes 43 of slider 39 and slider 45
Of the contact 12 into the screw holes 43 of the projections 39b and 45, respectively.
It is attached by screwing from the side opposite to b.

The carriers 32 and 33 are respectively the slider 3
The main body 31 is attached to the main body 31 so as to be sandwiched from both side surfaces 31b and 31c by the convex portions 39b and 45b of 9, 45 and the stopper 41. At this time, the screw 42
By reducing the distance between the protrusions 39b and 45b and the stopper 41, respectively.
Is pressed against the side surface 31b of the main body 31 and the concave portion 35, the inclined surface portion 41a of the stopper 41 is pressed against the concave portion 36, and the plate-like bodies 39a and 45a of the sliders 39 and 45 are pressed against the bottom surface 31a of the main body 31, respectively. Carrier 3 on body 31
In the state in which 2, 33 are respectively attached, the midpoint of both contactors 12 of the carrier 32, the measuring element 13b, and the contactor 12 of the carrier 33 are positioned on substantially the same straight line. Screw 4
By loosening the carrier 2, the carrier 32, 33 is moved to the main body 3
1 is movable in the arrangement direction of the measuring element 13b and the contact element 12, respectively.

The flatness measuring device 46 constructed as described above.
The flatness is measured by moving the carriers 32 and 33 to move each contact 12 so that the measurement span corresponds to the size of the surface to be measured, and then using the conventional flatness measuring device 22 described above. The same is done. In addition, for example, if a scale extending in the moving direction of the carriers 32 and 33 is provided on the upper surface 31d side of the side surface 31c of the main body 31, the positions of the carriers 32 and 33 can be set based on the scale of the scale. The previous measurement state can be simply and accurately reproduced, which is extremely convenient when, for example, another measurement target object is measured and then a certain measurement target object is measured again. The scale can be provided by pasting a scale plate or engraving on the side surface 31c.

In the above-described embodiment, the two contactors 12 and one contactor 12 on both sides of the measuring element 13b are attached to the carriers 32 and 33, respectively. However, for example, only one contactor 12 is attached to the carrier. , The other contact 12
Is directly attached to the body 31 and fixed, and the one contact 12
It is also possible to have a configuration in which only one is moved.

[0020]

As described above, according to the present invention, since the contactor is mounted on the carrier movably mounted on the main body, the position of the contactor, that is, the measurement span can be continuously changed. Since the carrier can be moved by loosening the screw slightly, it is possible to easily measure the flatness or the sphericity with an optimum measurement span.

Further, since the main body has a concave portion formed on each surface thereof to reduce the weight without impairing the rigidity, even an object to be measured having a low strength or hardness can be deformed or damaged. The flatness can be accurately measured without any trouble.

[Brief description of drawings]

FIG. 1A is a front view showing an embodiment of a flatness measuring device according to the present invention, and FIGS. 1B and 1C are a bottom view and a sectional view, respectively.

FIG. 2A is a front view showing a conventional flatness measuring instrument,
(B) and (C) are respectively the bottom view and the sectional view which abbreviate | omitted one part.

[Explanation of symbols]

 11 main body 12 contactor 13b measuring element 13c dial indicator 31 main body 32, 33 carrier 34, 35, 36, 37a, 37b concave portion

Front page continuation (72) Inventor Seizo Kiyozo 1-21-6 Dogenzaka, Shibuya-ku, Tokyo Japan Aviation Electronics Industry Limited (72) Inventor Masahiko Watanabe 1-26-1 Dogenzaka, Shibuya-ku, Tokyo Japan Airlines Electronic Industry Co., Ltd.

Claims (1)

[Claims] 1. A measuring element is attached to a main body so as to be movable back and forth with respect to a surface to be measured, and two contact elements are projected from one side of the measuring element from a bottom surface of the main body, and the other side of the measuring element is the main body. In the flatness measuring instrument in which one contact is projected from the bottom surface of the device, the tips of these contacts are brought into contact with the surface to be measured, and the main body is arranged, and the displacement of the measuring device is indicated by a dial indicator. A carrier is attached to the main body so as to be movable in the arrangement direction of the measuring element and the contact element, and one of the two contact elements and one contact element is attached to the carrier, and the carrier is parallel to the arrangement direction of the main body. A flatness measuring instrument in which a concave portion is formed in the central portion of the surface along the arrangement direction.