JP3086595B2 - Indication error measuring device for cylinder gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder gauge indicating error measuring device for measuring an inner diameter and the like by using two movable measuring elements.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional cylinder gauge has a movable probe 102 and a fixed replacement rod 103 at the tip of a main body 101. The probe 102 and the replacement rod 103 are attached to a workpiece. 8 is transmitted as the displacement of the push rod 104 by contacting with the probe, and an indicator such as a dial gauge (not shown) attached to the rear end of the main body is used to indicate the size of the inner diameter or the like, and FIG. The two tracing styluses 105A and 105B which are movable as described above are integrated at the upper part, and the pushing amount of both the tracing styluses 105A and 105B is transmitted as the displacement of the push rod 106, and the inner diameter and the like are indicated by a pointing tool such as a dial gauge. There is a cylinder gauge generally referred to as an O type that indicates the size.

[0003] Among them, a pointing error measuring instrument for a cylinder gauge for indicating the size by the pushing amount of one measuring element 102 shown in FIG. 7 is commercially available as shown in FIG. This is provided with a member capable of feeding one contact surface 107 horizontally by a predetermined amount, and a fixed contact surface 108 is provided concentrically with the member, and a cylinder gauge is measured between the contact surfaces 107 and 108. A support table 109 on which the child 102 and the replacement rod 103 can be arranged concentrically is provided.

However, a syringe gauge 105 having two movable measuring elements 105A and 105B shown in FIG.
The pointing error measuring instrument described above cannot be used because both measuring elements have to be pushed in by equal amounts. Therefore, as shown in FIG. 10, the block gauge 110 is combined into two types of widths and measured, and the pointing error is determined from the difference between the reading of the dial gauge scale and the width of the block gauge 110.

[0005]

The method of measuring an indication error by combining block gauges with two types of widths described in the prior art is based on two combinations of block gauges for cylinder gauges of various sizes. It has to be very troublesome and inefficient. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide an indicator capable of easily and accurately measuring an indicating error of a cylinder gauge having two measuring elements. It is intended to provide an error measuring device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a cylinder gauge pointing error measuring device according to the present invention comprises a cylinder gauge pointing error measuring device for measuring an inner diameter and the like by two movable measuring elements pointing outward. A support table for fixing the cylinder gauge, and a concentrically opposed and movably provided with the two measuring elements of the cylinder gauge fixed to the support table at the tip thereof. Two moving bodies having contact pieces that come into contact with the measuring element, driving means for moving the two moving objects, respectively, and contact detection for detecting that the two contact pieces have contacted the measuring element, respectively.
And parts, and a drive control section for controlling the driving of said driving means including
The contact piece is advanced by driving means,
After stopping the driving means based on the contact signal of the detection unit,
Move the cylinder forward by the specified amount of pushing
The indication error of the cylinder gauge is obtained from the difference with the moving amount .

[0007] using a piezoelectric element to drive means for moving the contact piece to the two mobile, supplied to the piezoelectric element
An application voltage control unit for controlling a voltage is provided.

[0008]

According to a first aspect of the present invention, a cylinder gauge having two measuring elements is set on a supporting member, and two moving bodies are advanced by driving means so as to approach each other, so that a contact piece of the moving body contacts the measuring element. Then, a signal is output from the contact detection means to stop the moving body from moving forward, and the two moving bodies are moved forward by a predetermined amount based on the stop position. The difference between the reading of the cylinder gauge and the predetermined amount at this time is defined as an instruction error.

According to a second aspect of the present invention, a contact detecting operation and a predetermined amount of movement from a reference position are performed by a telescopic member such as a piezoelectric element provided on the moving body, thereby enabling more accurate measurement of a pointing error. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. First Embodiment In the pointing error measuring apparatus shown in FIG. 1, two micrometers 2A and 2B are mounted on a main body 1 so as to face each other concentrically and horizontally. Micrometer 2A, 2
B is a known member in which the measuring rod (moving body) 2a is moved by a screw (not shown). The contact pieces 3A and 3B are in contact with the tip of the moving body 2a via the electric insulator 4, respectively. The surface is formed on the contact surface 3a.

On the main body 1, two stepping motors 9 are provided.
A and 9B are fixed concentrically with the moving body 2a of the micrometers 2A and 2B, and the output shafts of the two stepping motors are each directly connected to the male screw of the micrometer. For example, when a micrometer that advances 1 mm with two rotations of the male screw is used, the stepping motors 9A, 9
If the number of teeth of the rotor and the stator of B is 7.2 degrees (one rotation is 50 steps), the amount of advance can be easily confirmed by the micrometer scale.

Further, a support table 6 for vertically holding the cylinder gauge 5 is provided on the main body 1, and the cylinder gauge 5 is provided on the V groove 6a of the support table 6 with two tips 5 at the tip.
a and 5b are detachably attached by a clamper 7 so as to be substantially concentric with the moving bodies 2a and 2a.

The two probes 5a, 5 of the cylinder gauge 5
The upper part b is formed integrally, and is urged to open freely by using elasticity. The upper part b is pressed against the object to be measured by an equal amount, transmitted as a displacement of a push rod (not shown), and transmitted by the dial gauge 8. It indicates the size of the object to be measured.

FIG. 1 is a block diagram showing a control system for measuring an indication error. A measurement program storage unit 11 stores a previously input measurement program, and a pushing amount storage unit 12 receives an input from an input unit 13. In the portion for storing the pushing amount, the above-mentioned items 11 to 13 surrounded by a broken line can also use a general personal computer. The power supply 14 applies a small voltage to the support 6 or the main body 1, and the contact detection unit 15 detects the contact between the two contact pieces 3A and 3B and the two tracing styluses 5a and 5b on the contact pieces. The part detected by. The drive control unit 16 is a part that controls the drive of the two motors.

Next, the operation of the first embodiment will be described with reference to the flowchart of FIG. In step S1, the cylinder gauge 5 is set on the mounting base 6, and in step S2, the tracing stylus 5a,
Input to stores the pressing movement of 5b. In step S3, execution of the measurement program stored in the measurement program storage unit 11 is started. At the same time, the power supply 14 turns on. In step S4, the left contact piece 3A is advanced, and in step S5, it is checked whether the contact surface 3a at the tip has come into contact with the tracing stylus 5a and a contact signal is output from the contact detection unit 15. Returning to S4, if YES, the left contact piece 3A is immediately stopped in step S6.

In step S7, the right contact piece 3B is advanced, and in step S8, it is checked whether a contact signal is present. If NO, the process returns to step S7. If YES, in step S9, the right contact piece 3B is stopped. The operations of steps S7 to S9 can be performed simultaneously with steps S4 to S6.

Next, in step S10, the current positions of the left and right contact pieces 3A and 3B are set as reference positions, and it is confirmed whether or not the zero point of the scale matches the pointer of the dial gauge 8.
If not, correct it. Next, step S11
The left and right contact pieces 3A, 3B are
In the reference position. In step S12, the numerical value indicated by the pointer of the dial gauge 8 of the cylinder gauge 5 at this time is read, and step S1 is executed.
In step 3, an instruction error is obtained from the difference between the amount of pushing and the numerical value of the cylinder gauge 5 read.

Second Embodiment A pointing error measuring apparatus according to a second embodiment has a guide 21a provided horizontally on a main body 21 as shown in FIG.
Two symmetrical moving bodies 22A and 22B are movably mounted on a. Contact pieces 23A and 23B are adhered to the moving bodies 22A and 22B via an electrical insulator 24 so as to face each other.
Is formed on the contact surface 23a.

The moving bodies 22A and 22B are screwed by screws 28A and 28B by servo motors 29A and 29B fixed to the main body 21.
The current position is detected via the detection unit 26 by the linear scales 27A and 27B fixed to the main body 21. Therefore, in the case of this embodiment, the screws 28A,
Accurate positioning independent of the accuracy of 28B is possible.

The above is different from the first embodiment.
Others are the same, and the same reference numerals are given and the description is omitted. Also, the operation of the second embodiment is substantially the same as the operation of the first embodiment, and will not be described. Incidentally, as shown in FIG.
The positions of the moving bodies 22A, 22B can be detected by the rotation detectors 25A, 25B attached to the A, 29B.

Further, the servo motors 29A and 29B are replaced with stepping motors, and linear scales 27A and 27B are used.
Alternatively, the difference between the numerical value of the actual pushing amount detected by the rotation detectors 25A and 25B and the numerical value indicated by the cylinder gauge 5 can be used as the instruction error. In this case, the cost can be reduced due to the simplification of the drive servo system and the difference in the motor price.

Third Embodiment As shown in FIG. 5, a pointing error measuring apparatus according to a third embodiment includes a stack of piezoelectric elements 37A and 37B on opposite surfaces of two moving bodies 32A and 32B in parallel with a guide 21a. Attached concentrically, an electric insulator 34 is attached to the tips of the piezoelectric elements 37A and 37B.
The contact pieces 33A and 33B are adhered so as to face each other, and the distal end surfaces of the contact pieces 33A and 33B are formed on the contact surface 33a. The applied voltage control unit 36 in the block diagram controls the voltage supplied to the two piezoelectric elements 37A and 37B based on the command of the measurement program. The push amount storage unit 12 in this embodiment stores the push amount and the push amount. This is a part for storing an applied voltage corresponding to a moving amount. The above is different from the pointing error device of FIG. 5 of the second embodiment, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

Next, the operation of the third embodiment will be described with reference to the flowchart of FIG. In step S21, the cylinder gauge 5 is set on the mounting base 6, and in step S22
, When the push amount is input, the push amount and the applied voltage corresponding to the push amount are stored in the push amount storage unit 12. Step S
At 23, execution of the measurement program stored in the measurement program storage unit 11 is started. At the same time, the power supply 14 turns on.

Next, in step S24, a predetermined voltage is applied to each of the two piezoelectric elements 37A, 37B to slightly expand them, and the contact pieces 33A, 33B are advanced in advance. In step S25, the left contact piece 33A is moved forward by the movement of the moving body 32A. In step S26, it is checked whether the tracing stylus 5a has come into contact with the contact surface 33a of the contact piece 33A and a contact signal is output from the contact detection unit 15. I do. If NO, the process returns to step S25. If YES, in step S27, the left contact piece 33A is stopped.

Next, in step S28, the voltage applied to the piezoelectric element 37A is reduced to zero, the piezoelectric element 37A is contracted, the contact piece 33A is retracted, and slightly separated from the measuring element 5a of the cylinder gauge 5. Next, in step S29, the applied voltage is gradually increased to extend the piezoelectric element 37A. In step S30, it is confirmed whether or not there is a contact signal. If NO, the process returns to step S29, where YE
In the case of S, in step S31, the applied voltage at the time when the contact signal is present is maintained, and the piezoelectric element 37A is maintained in the current state.

In step S32, the right contact piece 33B is advanced by the movement of the moving body 32B.
In, it is confirmed whether or not there is a contact signal. And NO
In the case of, the process returns to step S32, and in the case of YES, in step S34, the right contact piece 33B is stopped. Next, in step S35, the applied voltage to the piezoelectric element 37B is reduced to zero, and the piezoelectric element is contracted to
B is retracted and slightly separated from the gauge gauge contact 5b.

In step S36, the applied voltage is gradually increased to extend the piezoelectric element 37B. Step S3
In step S7, it is confirmed whether or not there is a contact signal. In the case of NO, the process returns to step S36. In the case of YES, in step S38, the applied voltage at the time of the contact signal is maintained and the piezoelectric element 37B is displayed. Hold in state. The operations in steps S32 to S38 are performed in steps S25 to S31.
Can be done at the same time.

Next, in step S39, the piezoelectric elements 37A and 37A at the time when the applied voltage
The applied voltage of 7B is stored as a reference applied voltage, and it is confirmed whether or not the zero point of the scale matches the pointer of the dial gauge 8 of the cylinder gauge 5, and if not, the correction is made. In step S40, the contact piece 33 is set as a value obtained by adding the applied voltage to the piezoelectric elements 37A and 37B to the reference applied voltage and a predetermined voltage corresponding to the pushing amount stored in the pushing amount storage unit 12.
The contact surfaces 33a of A and 33B are advanced by the pushing amount. In step S41, the operator visually looks at the dial gauge 8 of the cylinder gauge 5 and reads the numerical value indicated by the pointer. In step S42, the difference between the numerical value indicated by the dial gauge 8 and the amount of pressing is determined as an instruction error.

As a common matter from the first embodiment to the third embodiment, when the two contact pieces have been advanced by the pushing amount from the reference position, a lamp or the like can be turned on to be readable by an operator. Can be notified. In addition, the initial position immediately before the contact detection corresponding to the cylinder gauge of various sizes can be stored, and can be moved to the initial position by rapid traverse, thereby shortening the measurement time. Also, the amount of pushing can be provided in the measurement program. Also, a hydraulic cylinder piston member such as hydraulic or air can be used instead of the motor.

[0030]

Since the present invention is configured as described above, the following effects can be obtained. A cylinder gauge with two probes is attached to the support base, and the two probes are automatically pushed in by a predetermined amount to read the indicated value of the cylinder gauge. The pointing error can be accurately measured without individual differences.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a pointing error measuring device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a configuration diagram of a pointing error measuring device according to a second embodiment.

FIG. 4 is a configuration diagram of another pointing error measuring device according to the second embodiment.

FIG. 5 is a configuration diagram of a pointing error measuring device according to a third embodiment.

FIG. 6 is a flowchart showing the operation of the third embodiment.

FIG. 7 is a partial cross-sectional view of a cylinder gauge having one conventional measuring element.

FIG. 8 is a partial cross-sectional view of two cylinder gauges having a conventional measuring element.

FIG. 9 is a configuration diagram of an indication error measuring device for a cylinder gauge having one measuring element according to the related art.

FIGS. 10A and 10B are explanatory views of a block gauge for measuring an indication error of a cylinder gauge having two conventional measuring elements.

[Explanation of symbols]

2A, 2B Micrometer 3A, 3B, 23A, 23B, 33A, 33B Contact piece 3a, 23a, 33a Contact surface 5 Cylinder gauge 6 Support base 5a, 5b
Measuring element 9A, 9B Stepping motor 11 Measurement program storage unit 12 Push amount storage unit 15 Contact detection unit 16 Drive control unit 25A, 25
B Rotation detector 27A, 27B Linear scale 29A, 29
B Servo motor 36 Applied voltage controller 37A, 37
B Piezoelectric element

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B 5/00-5/30

Claims (2)

(57) [Claims] 1. A device for measuring the indication error of the cylinder gauge for measuring the inner diameter or the like by two feeler movable outward facing each other, a support base for fixing the cylinder gauge, fixed to the support table Two moving bodies having a contact piece which is provided so as to be substantially concentrically opposed to and can move with the two measuring elements of the cylinder gauge and which comes into contact with the measuring element at a tip thereof, and driving means for respectively moving the two moving elements. A contact detection unit that detects that the two contact pieces have come into contact with the tracing stylus, and controls driving of the driving unit.
And a drive control unit for controlling
Move the contact piece forward and drive it based on the contact signal from the contact detector.
After stopping the moving means, move the cylinder
From the difference between the indicated amount of the gauge and the pushing amount, the cylinder gauge
An indication error measuring device for a cylinder gauge, wherein the indication error is obtained. A piezoelectric element 2. A front Symbol driving means for moving the contact piece into two mobile, supplied to the piezoelectric element
2. An apparatus according to claim 1, further comprising an applied voltage control unit for controlling a voltage .