JPS61250507A - Measuring apparatus - Google Patents

Abstract

PURPOSE:To perform highly accurate measurement with high efficiency, by automatically performing the core alignment of an article to be measured and a measuring head for measuring an inner diameter. CONSTITUTION:A measuring head 2 is raised to the direction shown by an arrow 15 and compressed air is injected from air supply apertures 10..., 13..., 14... and an article W to be measured is placed on a mount stand 1. When the measuring head 2 is gradually fallen to the direction shown by an arrow 15a, the gap between the head 2 and the hollow part V becomes narrow as the head 2 is gradually and deeply inserted in a hollow part V and the article W to be measured is located to the same axial position as the measuring head 2 according to the narrowing of the gap. By this method, the perfect core alignment of the article W to be measured is performed in such a stage that the measuring head 2 is fallen to the position where the air supply apertures 14... are opposed to the inner wall surface of the hollow part V. Then, on the basis of the detection signal outputted from an air/electricity converter showing the back pressure of compressed air injected from the air supply apertures 14... at this time, the inner diameter of the article W to be measured is calculated by an operation apparatus 6.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an inner diameter or outer diameter measuring device.

[Technical background of the invention and its problems]

Conventionally, as shown in Fig. 4, one method for measuring the inner diameter of the hollow part (person) of a cylindrical object (W) is to move a cylindrical measuring head (B) into the hollow part (A). Insert the measuring head (B
), compressed air is ejected from a plurality of air nozzles (C)... which are equally spaced along the circumferential direction of the tip of the air nozzle (C)... Firstly, there is a method for measuring the inner diameter of the hollow part (A). The tip of the measuring head (B) is tapered (D) to facilitate loose insertion into the hollow portion (A).

However, if the hollow part (A) and the measuring head (B) are not coaxial, that is, the hollow part (A) and the measuring head (B)
), the measuring head (B) will come into contact with the opening edge (B) of the hollow part (A), causing various problems. For example, when the object to be measured (W) is fixed to the support stand (F), when the coefficient of friction with the support stand (F) is large, or when the weight of the object to be measured (W) is
If it is too large compared to B), the measuring head (B) will be forced into the hollow part (A). As a result, the object to be measured (W) or the measurement head (B) may be damaged.

This has become a serious problem.

[Purpose of the invention]

The present invention has been made by paying attention to the above-mentioned circumstances.

It is an object of the present invention to provide a measuring device that can prevent damage to the object to be measured by automatically aligning the object to be measured and a measuring head for measuring the inner diameter.

[Summary of the invention]

The object to be measured, the inner diameter or outer diameter of which is to be measured, is supported by static pressure so as to be movable along the mounting surface, and at least three pieces are installed along the circumference at the tip of the measurement head that loosely fits into the object to be measured. A tapered portion is formed with an air supply hole that blows out compressed gas.

[Embodiments of the invention]

An embodiment of the present invention will be described below in detail with reference to sections.

FIG. 1 shows the measuring device of this embodiment.

This measuring device consists of a mounting table (1) on which a cylindrical object to be measured (W) is placed, and a cylindrical hollow part (V) of the object to be measured (W), into which an IC is loosely inserted and in the axial direction. A cylindrical measuring head (2) that is disposed so as to be able to rise and fall freely, and a lifting mechanism (not shown) that moves the measuring head (2) up and down.

A first air supply mechanism (4) that supplies compressed air to the object (W) mounting surface (3) of the mounting table (1), and a first air supply mechanism (4) that supplies compressed air to the mounting surface (3) of the object (W) on the mounting table (1), and a It is composed of a 20th air supply mechanism (5) that supplies compressed air to the outside, and an inner diameter measuring mechanism (6) that measures the inner diameter. However.

The mounting table (1) has a main body part (7) in the shape of nine tables with circular holes (L) having approximately the same diameter as the hollow part (V), and a main body part (7) in the shape of nine tables.
It consists of a circular hole (1a) and an annular regulating wall (8) protruding coaxially so as to loosely fit the object (W) thereon. The cylindrical hollow part (
9) is formed, and the object to be measured (W) is placed in the hollow part (9) within a certain range determined by the gap between the object to be measured (W) and the regulating wall (8). The mounting surface (3) has traps and a plurality of air supply holes tl as shown in Figure 2.
l...(3 i & low) are equally spaced and drilled. These air supply holes (II...) are connected to a compressed air source f41 (not shown) and constitute a tenth air supply mechanism (4).

The mounting surface (3) becomes a silent pressure sliding surface by being supplied with compressed air from the air supply hole a [...], and the object to be measured (W) can be moved with a slight force. It is now possible to do so. On the other hand, the measuring head (2) has a cylindrical shaft part aυ whose one end is connected to a lifting mechanism and whose outer diameter is smaller than the inner diameter of the hollow part (9), and a tapered shaft part aυ at the other end. It consists of a tapered part α formed so as to be. And in this taper part a unexpected phase.

Nine air supply holes αJ are drilled at equal intervals along the circumference.
<i&low 3 pieces) are opened in the axial direction (in multiple stages).

These air supply holes are connected to a second compressed air source (not shown) and constitute the 20th air supply mechanism (5).

In addition, air supply holes a are provided in the outer surface of the tapered portion of the shaft portion aυ (a portion adjacent to the outer surface of the shaft portion a), which are equally spaced along the circumferential direction.
4... (at least 3) are open. These air supply holes (
1 (... are each connected to a third compressed air source (not shown), and in the middle of these fluid pipes, there is a back pressure of the compressed air ejected from each air supply hole I... A plurality of pneumatic converters (not shown) are installed to detect the ) is connected to a computing device (not shown) K for calculating the inner diameter of the
...The butterfly constitutes the inner diameter measuring mechanism (6). On the other hand, the elevating mechanism holds the measuring head (2) coaxially with the regulating wall (8) and the circular hole (1a), and gradually closes the gap as it moves in the axial direction (arrow (15a) 1). , according to this, the object to be measured (W) is gradually moved to the measuring head (
2) is positioned coaxially with Thus, the air supply hole (1
At the stage when the measuring head (2) has descended to the position where the shaft faces the inner wall surface of the hollow portion (V), the object to be measured ('W) is completely aligned. At this time, based on the detection signal output from the pneumatic converter, which indicates the back pressure of the compressed air blown out from the air supply hole +14)... The inner diameter of is calculated.

In this way, in the inner diameter measuring device of this embodiment, the object to be measured (W) can be automatically aligned with the measuring head (2), so that υ
Damage to the object (W) to be measured is eliminated, and measurement efficiency is improved. Moreover, the accuracy of measuring the inner diameter of the object to be measured (W) is also improved.

Note that, although the above embodiment is exemplified with respect to an inner diameter measuring device, it can also be applied to an outer diameter measuring device as shown in FIG. The measuring head 01) in this case has a cylindrical shape, and has a hollow space into which a cylindrical object 4 to be measured is loosely inserted.

On the inner wall surface of the tip of this measuring head (two parts), a tapered part (material) whose opening side appears as a large diameter is formed. Air supply holes (c) arranged and drilled (at least 3) are open.

In addition, in the vicinity of the tapered part (24), air supply holes (A) for measuring the outer diameter (at least 3) are drilled at equal intervals along the circumferential direction. In this case Also, by statically supporting the object to be measured, automatic alignment can be performed in the same manner as in the above embodiment.

Further, the diameter measurement method may be any method including an air micrometer method, for example, an electric micrometer method. Furthermore, there are nine air supply holes along the circumferential direction for centering, rather than multiple stages.

Even one step is fine. Furthermore, fix the measuring head side.

The mounting table side may be raised and lowered.

〔Effect of the invention〕

The measuring device of the present invention can automatically align the object to be measured so that it is coaxial with the measurement head, so the inner diameter or outer diameter of the object can be adjusted with high precision without causing damage. And it can be measured with high efficiency.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a measuring device according to an embodiment of the present invention;
FIG. 2 is a plan view of the mounting table, FIG. 3 is an explanatory diagram of a measuring device according to another embodiment of the present invention, and FIG. 4 is an explanatory diagram of the drawbacks of conventional diameter measurement. (1): Placement table, (2>, (2υ): Measuring head. (3): Placement surface, aperture, Q4: Taper part. Worker's hand: Air supply hole, (W): Object to be measured. Agent: Patent attorney Kensuke Chika (and 1 other person) Figure 3

Claims (3)

[Claims] (1) A measurement head characterized by having the following configuration. (a) A mounting table that statically supports the object to be measured so as to be movable along the mounting surface on which the object whose diameter is to be measured is placed. A tapered part formed in a shape to be loosely fitted into the object to be measured, and having three or more air supply holes for ejecting compressed gas equally distributed in the circumferential direction at the tip facing the object to be measured. Measuring head with. (c) A diameter detection mechanism that is provided at a portion of the measurement head close to the tapered portion and detects the diameter of the object to be measured. (d) An elevating mechanism that supports the measurement head substantially coaxially with respect to the object to be measured supported on the mounting table and moves it forward and backward relative to the object to be measured in the axial direction. (2) The measuring device according to claim 1, wherein the measuring head is formed in a cylindrical shape and is loosely inserted into a cylindrical object whose inner diameter is to be measured. (3) The measuring device according to claim 1, wherein the measuring head is formed in a cylindrical shape and is loosely inserted into a cylindrical object to be measured in outer diameter.