JPH03152410A - Measuring apparatus for dimension - Google Patents

Abstract

PURPOSE:To automate an operation of measurement of a substance to be measured and also to enable correction of an error in measurement in relation to the wear of measuring surfaces of jaws and a change in temperature by correcting the error in measurement by comparing a dimension shown by a basic gage under a basic condition with a dimensional value of the basic gage when the substance to be measured is measured, prior to the operation of measurement of the substance to be measured. CONSTITUTION:Jaws 9 and 10 of which sliding direction is regulated by shift mechanisms 21 and 22 are made to engage with a basic gage 27 prior to an operation of measurement of a substance to be measured, by driving them by actuators 23 and 24. When it is assumed that a dimension shown by the basic gage 27 is 75.000 mm in an environment of 20 deg.C, for instance, a display device 36 is set to display 75.000 mm. When the gage 27 expands and the dimension thereof elongates to 75.003 mm in the environment of 50 deg.C, the display device 36 shows 75.003 mm. On the occasion, however, setting is made to show 75.000 mm by resetting the display device 36 before the substance to be measured is measured. Even when the substance having elongated in its dimension to 80.003 mm under the effect of a change in temperature is measure, the display device 36 displays 80.000 mm according to this constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a dimension measuring device for measuring, for example, external dimensions of mechanical parts.

[Conventional technology]

FIG. 2 is a perspective view showing an example of a conventional dimension measuring device, that is, a digital caliper, disclosed in, for example, Japanese Utility Model Application Publication No. 80-90612. In the figure, (1) is the main scale, (2)
is the slider that slides along the main scale (1), (3) is the outer case, (4) is the display that displays the position of the slider (2) with respect to the main scale (1), and (5) is the main scale. (B) is the switch, (7) is its switch cover, (8) is its operation button, (9), (10) and ( 11), (12)
are two sets of opposing jaws for measuring the outside and inside of the object to be measured, respectively.

FIG. 3 is a perspective view showing another example of a conventional dimension measuring device, that is, a digital caliper. This digital caliper has the same structure as the one in FIG. 2, except that the protruding height of the operation button (8) is the same as or slightly lower than the surface of the outer case (3).

In order to measure the object to be measured in such a device,
First, manually operate the operation button (8) to turn on the switch (8), move the finger hook (5), and slide the slider (2).
) is attached to the main scale (1). Then, when the object to be measured is placed between the opposing jaws (9) and (10), the outer dimensions of the object are displayed on the display section (4) from the position of the slider (2).

[Problems to be Solved by the Invention] Conventional digital calipers are configured as described above, so when the measuring surfaces of the gauges (9) and (10) wear out, for example, the standard dimensions can be measured using a block gauge or the like. However, there were problems such as the zero point had to be corrected manually and it could not cope with temperature changes.

In view of the above points, an object of the present invention is to provide a dimension measuring device that can automate the measurement operation of the object to be measured, and that can easily correct measurement errors caused by wear of the aluminum surface of the jaw or temperature changes. shall be.

[Means for Solving the Problems] The dimension DI determination device according to the present invention includes a pair of moving mechanisms that are installed on a base and capable of linear movement, and a pair of opposingly arranged moving mechanisms that are respectively attached to these moving mechanisms and move forward and backward. A pair of actuators that drive these jaws, a pair of detectors that respectively detect the position of the jaws with respect to the base, and a material made of the same material as the object to be measured or a material with a clear coefficient of linear expansion. It is equipped with a reference gauge installed so as to be able to engage with the measuring surface of the gauge.

[Operation] In the present invention, a pair of jaws whose sliding directions are regulated by a moving mechanism installed on a base are driven by actuators corresponding to each jaw to measure the object before measuring the object to be measured. A reference gauge made of the same material as the object or a material with a clear coefficient of linear expansion is engaged, and in this state the dimensions of the reference gauge under standard conditions are compared with the dimensions of the reference gauge when measuring the object. , the measured object is measured by correcting measurement errors due to wear of the -PI constant surface and temperature changes.

[Example] Hereinafter, the present invention will be explained with reference to an example in FIG. 1, in which parts corresponding to the conventional ones are denoted by the same reference numerals. , a pair of moving mechanisms capable of linear movement installed on the base (20) (
21), (22), and moving mechanisms (21), (22)
) A pair of jaws (9), (10) are arranged opposite to each other and move forward and backward, and the jaws (9), (
a pair of actuators (23) that drive the respective actuators (10);
), (24), and the base (20) to the base (9)
) and (10), a pair of detectors (
25), (2G), made of the same material as the object to be measured or a material with a clear linear expansion coefficient, and (9),
(10) Measuring surface (9a) of the probe attached to (
10a) and a reference gauge (27) installed so as to be able to engage with each other, the gauges (9) and (10) whose sliding directions are regulated by moving mechanisms (21) and (22) are connected to the object to be measured. Prior to the measurement operation, the actuator (23)
, (24) to engage with the reference gauge (27), and in this state, the dimensions of the reference gauge (27) under the reference condition and the actual reference gauge (27) when measuring the object to be measured.
) in order to correct measurement errors due to wear and temperature changes on the measurement surfaces (9a) and (loa) of measurements (9) and (10).

To explain this in more detail, the moving mechanisms (21) and (22) include a pair of guides (2g) and (29) fixed in parallel to each other on the side surface of the base (20);
(29) and two sets of sliders (30), (
The sliders <30) and (3I) are guided by the guides (28) and (29) and move in a straight line, thereby moving the sliders (9) and (10) in the direction of arrow A.

Move forward and backward in direction B to measure its measurement surface (9a), (LO
a) is expanded/contracted.

The actuators (23) and (24) have a piston rod (32a) and a piston rod (Ha) at the end thereof (9), respectively.
), a pair of air cylinders connected and fixed to (10) (
32), (33) and one end is on the base (20) side,
The piston rods (32a) and (33a) of the air cylinders (32) and (33) are made up of tension springs (14) and (35) connected to the other end (9) and (to) side, respectively. When degenerates, the measurement plane (9a) of (9), (10), (1
0a) Expand the gap against the elastic force of the tension springs (34) and (35), and press the air cylinders (32) and (3
3) does not operate and the piston rods (32a) and (33
When a) is in a state where it can be extended, the position (9)
, (10) to narrow the distance between the measurement surfaces (9a) and (10a) by the restoring force of the tension springs (34) and (35).

The detectors (25) and (2B) consist of electric micrometers, and the 1lllJ determination results thereof are displayed on a display device (3B) connected thereto.

The reference gauge (27) can be detachably attached to either the measuring surface (9a) or (loa) of the gauge (9) or (10), and can be replaced depending on the material of the object to be measured. It is now possible to do so.

In the dimension n1 determination device of this embodiment configured as described above, if the dimension of the reference gauge (27) is 75.000 mm in an environment of 20°C, for example, the display device (36) will display 75.000 mm.
Set it to display 5.000mm. At this time,
When measuring an object having dimensions in the order of 80.000, the display device (36) shows 80.000. [Displayed as 100mm.

Next, the reference gauge (27) expands in a 50°C environment,
If the dimension increases to 75,003 ++lIs, the display device (36) will display 75,003 am, but before measuring the object, the display device (36) is reset to display 75,000 mm. Set to . This results in a dimension of 80.003+ due to temperature changes.
Even if you measure an object that extends to
) is displayed as 80.000mm.

In this way, before measuring the object to be measured, the reference gauge (2
7) on the measuring surface (9a) of (9) and (10),
(10a) The display device (36) is 75.0
By setting it to display 00mm, measurements can be made without being affected by temperature changes.

In addition, although the control device is not shown in the above-mentioned embodiment,
It is also possible to automate the measurement by adding a control device that automatically drives the air cylinders (32) and (H) and automatically processes information from the detectors (25) and (2B). Needless to say.

Furthermore, in the above-described embodiment, the air cylinder (32) is used as the actuator for driving the doors (9) and (10).

(33) and tension springs (34) and (35) are shown, but this can be done using a motor and a ball screw.
In addition, a control device capable of force control may be used.

Furthermore, in the above-described embodiment, the present invention was used to determine the outer dimension of the object to be measured (n1), but by configuring the reference gauge separately, the present invention can be applied to measure the inner dimension of the object to be measured. Needless to say, it is also applicable.

[Effects of the Invention] As described above, according to the present invention, a pair of jaws, the sliding direction of which is regulated by a moving mechanism installed on a base, is attached to each jaw before the measurement operation of the object to be measured. It is driven by a corresponding actuator to engage a reference gauge made of the same material as the object to be measured or a material with a clear linear expansion coefficient, and in this state, the dimensions of the reference gauge and the reference when measuring the object to be measured under the reference conditions are set. By comparing the dimensional values of the gauge and correcting measurement errors due to wear and temperature changes on the measurement surface of the gauge, the measurement of the object can be performed. This has the effect of automating the measurement operation of a fixed object, and also making it possible to easily correct measurement errors due to wear and temperature changes on the measurement surface of the instrument, improving measurement accuracy and reliability. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall configuration of a dimension measuring device according to an embodiment of the present invention, FIG. 2 is a perspective view showing an example of a conventional dimension measuring device, and FIG. 3 is a perspective view showing an example of a conventional dimension measuring device. It is a perspective view showing an example. In the figure, (9), (10) are the legs, (20) is the base, (21), (22) are the moving mechanisms, (23),
(24) is an actuator, (25) and (2B) are detectors, and (27) is a reference gauge. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A pair of moving mechanisms capable of linear movement installed on the base,
A pair of oppositely arranged jaws attached to each of these moving mechanisms to move forward and backward, a pair of actuators that drive these jaws, a pair of detectors that respectively detect the position of the jaws with respect to the base, and a measured object. A dimension measuring device comprising a reference gauge made of the same material as the object or a material with a clear coefficient of linear expansion and installed so as to be able to engage with the measuring surface of the object.