JP2002228434A - Measuring device with temperature correcting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten time for input processing and reduce the number of errors by improving operability at temperature correction processing in a measuring device with a temperature correcting function. SOLUTION: The name of the material of a work 8 and coefficients of linear expansion can be registered and edited. Only one item is selected from a list of registered information, and a corresponding coefficient of linear expansion is used for computations for temperature correction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device having a temperature correcting function, and is particularly suitable for use in a size / shape measuring device such as a one-dimensional height measuring device, a three-dimensional coordinate measuring device, and a shape measuring device. Also, the present invention relates to a measuring instrument with a temperature correction function capable of improving operability during temperature correction processing and reducing time and errors in input processing.

[0002]

2. Description of the Related Art A measuring element provided to be able to move up and down in a vertical direction is provided. 2. Description of the Related Art A one-dimensional height measuring machine for measuring dimensions of a shaft or the like, a so-called height gauge, is known.

[0003] The height gauge comprises a base movably mounted on a surface plate, a support standing upright on the base,
A slider having a tracing stylus provided so as to be able to move up and down along the support, means for moving the slider up and down, a displacement detector for detecting a displacement amount of the slider in a height direction, display means, and the slider Control means for moving up and down, taking in the detected value of the displacement detector when the measuring element comes into contact with the measuring surface of the object to be measured, and displaying the detected value on the display means.

In such a height gauge, when measuring, a certain measurement item is instructed, and when the slider moves up or down, the tracing stylus comes into contact with the measurement surface of the object to be measured. When this happens, the detected value of the displacement detector at that time is taken in, and this detected value is displayed on the display means.

[0005] Therefore, the measurer can determine the height position of the measurement surface of the object to be measured with the measuring element from the detected value (measured value) displayed on the display means.

By the way, a so-called thermal expansion phenomenon exists in an object, which expands and contracts with temperature. Therefore, due to the thermal expansion of the DUT, its dimensions change with temperature,
Also, the measured value changes depending on the temperature due to the thermal expansion of the length measuring system of the measuring machine.

In general, design values such as dimensions of a work are assumed to be a constant temperature, for example, 20 ° C. Therefore,
When measuring the dimensions of the workpiece and performing the tolerance comparison, it is necessary to perform the measurement in an environment where the temperature is maintained at 20 ° C., for example, in a constant temperature room.

However, since it is costly to realize and maintain a constant temperature environment, normally, the amount of thermal expansion is calculated by the following equation (1), and the temperature is corrected by the following equation (2). A value is obtained, and a dimension measurement value at 20 ° C. is further obtained by Expression (3).

Thermal expansion amount = linear expansion coefficient × (environmental temperature−20 ° C.) × dimension (1)

Temperature correction value = (linear expansion coefficient of measurement work−linear expansion coefficient of scale of measuring machine) × (actual environment temperature−20 ° C.) × dimension measurement value of actual environment temperature (2)

Dimension measurement value at 20 ° C. = dimension measurement value of actual environmental temperature−temperature correction value (3)

In order to realize this temperature correction function, a temperature sensor is connected to a measuring machine or a work to automatically take in the environmental temperature, or an operator measures the environmental temperature with a separate thermometer. Input the numerical value to the measuring machine.
The linear expansion coefficient of the scale of the measuring instrument varies depending on the material of the scale, but is set in advance because it is a fixed value for the system of the measuring instrument. On the other hand, since the linear expansion coefficient of a work differs depending on the material of the work, it must be set for each work.

Therefore, in a conventional measuring instrument, an operator
For example, referring to the list, check the linear expansion coefficient of the work,
I was typing.

[0014]

However, since the material of the work varies, it is necessary to check the coefficient of linear expansion of the work one by one and input a key each time the work is changed. This not only causes a decrease in the measurement efficiency, but also causes a problem in that if there is an input error, the measurement accuracy also deteriorates.

The present invention has been made to solve the above-mentioned conventional problems, and has improved operability during temperature correction processing.
It is an object to reduce input processing time and mistakes.

[0016]

According to the present invention, there is provided a measuring instrument having a temperature correcting function, which stores a plurality of pairs of a character string or a code capable of specifying a material of an object to be measured and a numerical value of a linear expansion coefficient. Means for displaying a list of the stored data, means for selecting arbitrary data from the displayed list, and the numerical value of the linear expansion coefficient in the selected data required for the temperature correction calculation process. Means for setting the linear expansion coefficient of the object to be measured.

Further, operability is improved by providing means for correcting, deleting, and adding the stored data.

Further, the operability is further improved by storing the names of materials that are frequently used in industry and the data of the corresponding linear expansion coefficients from the beginning.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing a height gauge as a one-dimensional measuring machine. As shown in FIG. 1, a height gauge according to the present embodiment includes a base 11 movably mounted on a surface plate 10, and a support 12 erected on the base 11.
And a slider 14 having a tracing stylus 13 provided vertically up and down along the column 12.
In the figure, reference numeral 8 denotes an object to be measured (work).

The base 11 is provided with a grip portion 15 on the back side of the support column 12. On the upper surface of the grip portion 15, a display device 16 such as an LCD constituting a display means on the front surface and a key input portion 17 are provided. The display operation unit 18 having the following is provided so as to be pivotable.

On the lower surface of the base 11, a platen 10
Air floating means 19 for blowing air upward to float the base 11 on the surface plate 10 is provided. The air levitation means 19 is provided on the lower surface of the base 11 and has a plurality of air pads 19A having innumerable air ejection holes, and a compressor (not shown, a lower portion of the grip portion 15 for supplying air to the air pads 19A). Installation).

The slider 14 is provided with a slider up / down handle 20 for moving the slider up and down by hand.

An air levitation control switch (hereinafter, referred to as a levitation switch) 31 is provided on the front surface of the grip portion 15, and a power switch 32 (not shown in FIG. 1) is provided on the upper rear surface of the display operation portion 18. Is provided. The levitation switch 31 controls the supply and cutoff of air to the air levitation means 19.

The object 8 has a temperature sensor (for example, thermocouple or resistance thermometer) 3 for measuring its temperature.
4 is attached using, for example, clay or a magnet.

FIG. 2 is a block diagram showing the overall configuration of this embodiment. In the figure, a control device 41 includes a CPU 42 as control means and a memory 43.

The memory 43 includes a program storage section 43A storing various measurement procedure programs, a measurement data storage section 43B storing measurement data, and a linear expansion coefficient storage section 43C storing a list of linear expansion coefficients. Are provided respectively.

The CPU 42 includes the key input unit 1
7. In addition to the lifting switch 31, the power switch 32, the temperature sensor 34, the display device 16, and the air floating means 19, a lifting drive means 44 for lifting and lowering the slider 14 in the vertical direction, and a lifting drive means Displacement detectors 45 for detecting the amount of displacement of the slider 14 moved up and down by 44 in the height direction are connected to each other.

The elevation drive means 44 includes a vertically moving motor 4.
4A, a constant pressure mechanism 44B provided on the output shaft of the vertical movement motor 44A, and a brake mechanism 44C for forcibly stopping the vertical movement motor 44A.
The constant-pressure mechanism 44B has a function of transmitting the rotation of the up-and-down motor 44A to the slider 14 via a transmission means such as a belt to lift and lower the slider 14, and having a function of idling when the slider 14 is loaded with a certain load or more. Prepare.

The displacement detector 45 includes a scale provided along the column 12 and having an optical grating at a constant pitch in the vertical direction, and a detector arranged on the slider 14 so as to face the scale. In cooperation with the above, the amount of displacement of the slider 14 on the column 12 in the height direction is detected as an electric signal.

In the present embodiment, the linear expansion coefficient storage section 43C has a means for storing a plurality of pairs of a character string or code capable of specifying the material of the workpiece (work) and a numerical value of the linear expansion coefficient. The display device 16 constitutes means for displaying a list of stored data, the key input unit 17 constitutes means for selecting arbitrary data from the displayed list, and the CPU 42 And means for setting the numerical value of the expansion coefficient in the selected data as the linear expansion coefficient of the measured object necessary for the temperature correction calculation processing.

Hereinafter, the operation of the present embodiment will be described.

The setting of the work linear expansion coefficient is performed according to the procedure shown in FIG.

That is, first, in step 100, the operator presses a predetermined operation key (for example, a "setting" key) of the key input section 17.

Then, in step 102, the system is set in advance or the operator has already registered
The table of work linear expansion coefficients as shown in FIG.
6 is displayed. Here, the left column of the list displays, for example, a name indicating the material of the work and a character string or code such as a part number capable of specifying the material as shown in FIG. , The value of the corresponding linear expansion coefficient is, for example, 1
It can be displayed in units of 0 ^-6 / K. Generally, the operator may not know the material of the workpiece,
Part numbers are more useful.

Next, at step 104, the operator
With a predetermined operation key (for example, a "cursor" key) of the key input unit 17, a row including a material name or the like corresponding to the work is selected. The selected line is displayed, for example, in black and white inverted.

Next, at step 106, the operator
The selection is determined by pressing a predetermined operation key (for example, a “confirm” key) of the key input unit 17.

Then, the CPU 42 proceeds to step 108
Then, the coefficient of linear expansion of the selected row is transferred to a temperature correction processing unit (not shown) in the system.

The registration of the work linear expansion coefficient is performed according to a procedure as shown in FIG.

That is, first, at step 200, the operator presses a predetermined operation key (for example, a "register" key) of the key input section 17.

Then, in step 202, a list of work linear expansion coefficients registered so far, for example, as shown in FIG. 4, is displayed on the display device 16.

In order to correct the registered contents, the operator selects a line to be corrected by using a predetermined operation key (for example, a "cursor" key) of the key operation unit 17 in step 204 of FIG. The selected line is displayed, for example, in black and white inverted.

Next, at step 206, the operator
The selection is determined by pressing a predetermined operation key (for example, a “confirm” key) of the key operation unit 17.

Next, at step 208, the operator corrects the character string / code such as the material name of the selected line and the numerical value of the coefficient of linear expansion by key input of the key input unit 17.

On the other hand, when additional registration is desired, the operator presses a predetermined operation key (for example, an “add” key) of the key input unit 17 in step 210.

Next, at step 212, the operator inputs a character string / code such as a material name to be added and a numerical value of the coefficient of linear expansion using the key input section 17 by key.

Then, the CPU 42 determines in step 21
At 4, the entered data is added to the end of the list. FIG. 6 shows an example in which nickel has been added.

On the other hand, when it is desired to delete the registered contents, the operator selects the line to be deleted by using a predetermined operation key (for example, a "cursor" key) of the key input unit 17 in step 220 of FIG. . The selected line is displayed, for example, in black and white inverted.

Next, at step 222, the operator
A predetermined key (for example, a “delete” key) of the key input unit 17 is pressed.

Then, in step 224, the CPU 42 deletes the data of the selected row.

In the present embodiment, a temperature sensor 34 is provided on the work 8 to be measured, and the temperature of the work 8 is detected based on the output of the temperature sensor 34. Regardless, accurate temperature correction can be performed. Note that a non-contact type temperature sensor such as an infrared radiation thermometer, instead of a contact type temperature sensor such as a thermocouple or a resistance thermometer, may be provided at a position where the work can be seen, and the temperature of the work may be measured in a non-contact manner. Alternatively, if the temperature change during the measurement can be ignored, it is also possible to configure so that the operator inputs the temperature measurement value measured by a separate thermometer from the outside through the key input unit 17.

Also, the input method of the material name and the part number is as follows.
Not limited to key input, for example, by attaching a bar code indicating the part number to the work and reading the part number using a bar code reader, the linear expansion coefficient is automatically set without key input It is also possible to configure so that

In the above embodiment, a photoelectric displacement detector is used. However, the type of the displacement detector is not limited to this, and may be a capacitance type, a magnetic type, or the like. It is apparent that the application object is not limited to height gates, and can be similarly applied to general dimension / shape measuring machines including three-dimensional coordinate measuring machines and shape measuring machines.

[0054]

According to the present invention, it is possible to improve the operability at the time of the temperature correction processing and to reduce the time and mistakes of the input processing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a block diagram of the embodiment.

FIG. 3 is a flowchart showing a procedure for setting a work linear expansion coefficient.

FIG. 4 is a chart showing an example of a list of work linear expansion coefficients.

FIG. 5 is a flowchart showing a procedure for registering a work linear expansion coefficient.

FIG. 6 is a chart showing an example of a list of work linear expansion coefficients to which nickel has been added.

[Explanation of symbols]

 Reference Signs List 8 Work (measurement object) 10 Surface plate 11 Base 12 Measuring element 14 Slider 16 Display device 17 Key input unit 34 Temperature sensor 41 Controller 42 CPU 43 Memory 43B Measurement data storage unit 43C Linear expansion coefficient storage unit 45 Displacement detector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Nobuyuki Hama, Inventor 6-8-20 Hiroko Shinkai, Kure-shi, Hiroshima F-term (reference) 2F069 AA02 AA04 AA42 AA66 BB00 DD15 EE24 GG01 GG11 HH30 MM13 MM23 QQ08 QQ17

Claims (3)

[Claims] 1. A means for storing a plurality of pairs of a character string or code capable of specifying a material of an object to be measured and a numerical value of a coefficient of linear expansion; a means for displaying a list of the stored data; Means for selecting arbitrary data from the displayed list; and means for setting a numerical value of the coefficient of linear expansion in the selected data as a coefficient of linear expansion of the DUT required for the temperature correction calculation process. A measuring device with a temperature correction function. 2. correction and deletion of the stored data;
2. The measuring device with a temperature correction function according to claim 1, further comprising means for performing addition. 3. The measurement with temperature compensation function according to claim 1, wherein the names of materials that are frequently used in industry and the data of the corresponding linear expansion coefficient are stored from the beginning. Machine.