JPS6027806A - Measuring device - Google Patents

Abstract

PURPOSE:To make it possible to measure an internal diameter, cylindricity, roundness, and in addition, squareness by one inserting operation of the same measuring head, by changing the combinations of facing air nozzles, which are provided in a plurality of pairs. CONSTITUTION:A plurality of air nozzles 13 are provided at the outer surface of a projection part 12, which is protruded from an end surface 11 of a measuring head 10. Two pairs of the nozzles 13 are provided so that they are opened at the four equally separated positions on a circle on the same plane and the positions in the axial directions of the pairs of the nozzles are different. Four nozzles 14 are provided on the end surface 11. With respect to the nozzles 13 and air feeding paths 20, which communicate the nozzles, the first state, under which a pair of the nozzles that face on the same plane to each other are communicated, and the second state, under which a pair of the nozzles that face on the two planes whose axial directions are different are communicated, are provided. The two states can be switched. Since the connections can be switched in this way, squareness, in addition to an internal diameter, cylindricity, and roundness can be measured by one inserting operation of the same head.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a measuring device for an air set that measures the inner diameter, roundness, cylindricity, and squareness of an object to be measured.

<Prior Art> A complete air measuring device utilizes the fact that the back pressure of an air nozzle placed close to a surface to be measured changes depending on the gap between the nozzle and the surface to be measured. Such air nozzles include an independent nozzle type in which a pressure detector is connected to each nozzle alone, and an opposed nozzle type in which a pair of opposing nozzles are connected to one pressure detector. In the former, a pressure detector is provided for each nozzle, so when measuring the diameter dimension of a pair of nozzles, it is necessary to use a calculation circuit to calculate the output signal of the pressure detector corresponding to each nozzle. Therefore, in addition to a level determination circuit that determines the signal level of each pressure detector, an arithmetic circuit that converts two signals into one signal is also required, which increases the number of components and increases costs.

In the latter case, the back pressure of a pair of nozzles sharing a common supply path is guided to one pressure detector, so a signal according to the diameter is output from one pressure detector, reducing the number of pressure detectors. Moreover, it does not require an arithmetic circuit.

In this manner, the opposed nozzle method can reduce the number of components, and therefore is extremely advantageous in terms of cost when measuring inner diameter, roundness, and cylindricity.

However, when measuring the perpendicularity of the inner circumferential surface of the hole with respect to the end surface, a difference in hole diameter can be detected with the same configuration as the hole diameter measurement, but it is impossible to detect a case where the holes have the same diameter but are tilted.

For this reason, conventionally, the measurement of squareness was performed using a separate measurement head in a separate process from the measurement of hole diameter, cylindricity, and roundness.

This not only increases the cost of measuring equipment, but also
This method has the disadvantage that it takes a long time to measure because it has to be measured at separate stations.

<Objective of the Invention> The object of the present invention is to measure not only the inner diameter, cylindricity, roundness, etc., but also the squareness by the same insertion operation of the same measuring head, and also to improve the performance of the measuring device. The goal is to reduce costs and shorten measurement time.

<Configuration of the Invention> The characteristic configuration of the present invention is that the measurement head includes a plurality of air nozzle sets facing the inner circumferential surface of the hole of the object to be measured and arranged in at least four phases, at least two sets spaced apart in the axial direction. At the same time, a set of air nozzles facing the end face of the object to be measured is provided, each air nozzle facing the end face is connected to a pressure detector separately, and each air nozzle facing the inner peripheral surface of the hole is connected to the same plane. A first connection state in which a pair of air nozzles located in opposite directions are connected to each other, and a second connection state in which a pair of air nozzles located in two planes having different axial positions and in opposite directions are connected to each other. Each is connected to a pressure detector via a switchable switching valve.

If the switching valve is switched to the first connection state, the air nozzle facing the inner peripheral surface of the hole can measure the inner diameter, cylindricity, roundness, etc. using the opposed nozzle method, and the second connection state By switching to , the perpendicularity of the inner circumferential surface of the hole with respect to the end surface can be measured using the opposed nozzle method, and all measurements can be quickly performed with one insertion operation into the object to be measured.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a vertical cross-sectional view without showing the inspection head 10, in which a shaft-like projection 12 is vertically protruded from the center of the reference end surface 11, and a plurality of air nozzles 13 are opened on the outer peripheral surface of the shaft-shaped projection 12. . The air nozzles 13 are provided with two sets of air nozzles that open at four equal positions on the circumference within the same plane, and two sets of air nozzles at different positions in the axial direction, for a total of eight air nozzles. Four air nozzles 1 are also installed in the same phase on the reference end face 11.
4 is open. A relief groove 15 is cut around each nozzle 13 to eliminate mutual interference of outflow fluid, and each relief groove 15 is communicated with the atmosphere through an axial groove 16. Five radial relief grooves 17 are carved around the nozzle 14 opening in the reference end face 11. One end of each nozzle 13, 14 communicates with air supply passages 20 and 21 bored in the inspection head 10, respectively, and the air nozzle 14, which opens at the reference end face, communicates with the air supply passage 21 as shown in FIG. The pressure detection unit PD is connected to the pressure detection unit PD via the pressure detection unit PD.

The air supply path 20, which is in special communication with the eight nozzles 13 that open on the outer peripheral surface of the shaft-like protrusion 12, is connected to the electromagnetic switching valves SVI to S.
A first state in which a pair of nozzles facing each other in the same plane communicate with each other via V8, and a second state in which a pair of nozzles facing each other in two planes having different axial positions communicate with each other. is switchably connected to. Connection point 0 of a pair of nozzles to be switched. P, Q,
R is connected to a pressure detection unit (PD) via a communication path 22.

6 and 7 show the object W to be measured and the nozzle positions, and the alpha symbol indicating each nozzle position corresponds to the alpha symbol attached to the nozzle in FIG. 5.

6- by the switching action of the electromagnetic switching valves SVI to SV8. The communication relationship between each nozzle will be explained next.

In the illustrated state in which all the solenoids of the electromagnetic switching valves SVI to SV8 are deenergized, G is applied to the nozzle.

The air supply passages leading to F and J are closed, and there is no communication between a pair of nozzles that face each other in the same plane, for example, H and F or L and J, and a pair of corresponding nozzles in different planes. For example, H and J or F and L are not connected.

(1) Communication of opposing nozzles in the same plane To measure the inner diameter, cylindricity, and roundness, the mutually opposing nozzles of 41[1] located in the same plane are communicated with each other, and the combined back pressure of both nozzles is measured. The pressure is guided to one pressure detector and the measurement is performed. Such communication switching is performed using the electromagnetic switching valves SVI, SV4°, SV6. By energizing the solenoid of SV7, nozzle I is connected to E and G, F and H,
L and J are communicated with each other, and changes in back pressure of the pair of nozzles communicated with each other are guided to a pressure sensor of a pressure detection unit and measured.

For inner diameter measurement, 4 pairs of nozzles (E1G) are used.
, (F1H), , (J1K), and (J1L), the minimum value of each set is taken as the inner diameter measurement value.

To measure roundness, from the four sets of measured values, the difference between orthogonal nozzles is determined by l (E0G) - (F0H)1 or l
Let it be the maximum value of (I+K)-(J+L)l.

For cylindricity measurement, from the four sets of measured values, the difference between the same phase nozzles is l (E + G) - (1 + K) 1 or l
Let it be the maximum value of (F+H)-(J+L)l.

(2) Communication of opposing nozzles in different planes The perpendicularity of the inner circumferential surface of the hole with respect to the flange end face of the object W to be measured is measured by communicating the nozzles located in different planes and facing each other. Such communication path switching is
From the state shown in FIG. 5, the solenoid switching valve SV2. SV3. SV5.
By energizing the solenoid of SV8, I, GlL, F, and J and H are communicated with nozzle E, and the back pressure change of the pair of nozzles communicated with each other is guided to the sensor of pressure detection unit PD. It is measured by

To measure the squareness, measure the hole squareness on the inner surface that includes nozzles A and C that open on the reference end face 11, and measure the hole squareness on the inner surface that includes nozzles B and D as a reference. There is a measurement of squareness.

Here, Ll and L2 are the axial distance of the inner diameter measuring nozzle (Ll
- the axial distance between nozzles F and J, L2 - the axial distance between nozzles E and I), and L3 is the diagonal distance between the end face measurement nozzles.

The perpendicularity in the case of nozzle A and C standards is the following formula % formula % The squareness in the case of nozzle B and D standards is the following formula 9- The maximum value of PARI and PAR2 is taken as the measured value of the squareness.

Note that constant pressure air is supplied to the pressure detection unit PD in FIG. 5 from an air supply line 23 via a regulator valve 24.

As shown in FIG. 8, each nozzle air supply path of each of the pressure detection units (PD) is communicated via a branch path 25 from the air supply line 23 and a first orifice 26. A pressure sensor 30 is provided to detect the pressure in the nozzle air supply path 20 or 21, that is, the nozzle back pressure. The output signal from the pressure sensor 3° is given to the data processing device 32 via the AD converter 31, and the measured values of the inner diameter, cylindricity, roundness, and squareness are calculated from the output of each pressure sensor 3o. .

<Effects of the Invention> As described above, by appropriately switching the electromagnetic switching valves SVI to SV8 with the inspection head inserted into the object W to be measured, a pair of opposing nozzles located in the same plane,
For example, H! : F are communicated with each other, the combined back pressure of both nozzles is measured by a pressure sensor, and the inner diameter, cylindricity, and roundness are determined according to the back pressure measurement values of other sets of nozzles as described above. measurements are taken.

In addition, when the electromagnetic switching valve is switched while the measurement head is inserted, a pair of opposing nozzles located in different planes, for example F(!:L), are communicated with each other, and the combined back pressure of both nozzles is measured by a pressure sensor. and a nozzle opening on the end face,
For example, the perpendicularity of the hole is measured based on the measured values of B and D.

In this way, with only the switching action of the switching valve with − times of insertion operation,
In addition to measuring the inner diameter, cylindricity, and roundness, it is also possible to measure the large surface angle relative to the end face, which has the advantage of not only reducing the number of measuring stations but also significantly shortening the measuring time. .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the inspection head, Fig. 2 is an external view of its main parts, and Fig.
FIG. 4 is a sectional view taken along the line rV-IV in FIG. 2, FIG. 5 is a circuit diagram for switching the nozzle connection state, and FIG. FIG. 7 is a diagram showing the relationship between each nozzle position and the object to be measured, and FIG. 8 is a diagram showing the configuration of the pressure detection unit. DESCRIPTION OF SYMBOLS 10... Inspection head, 13.14... Air nozzle, 20.21... Air supply path, 22... Communication path, 23.
... Supply line, 24 ... Regulator valve, PD
...Pressure detection unit, 25... Branch path, 26...
・Orifice, 30...pressure sensor, 31...AD
converter. Patent applicant Toyota Machinery Co., Ltd.

Claims (1)

[Claims] (1) An inspection head equipped with a plurality of first air nozzles facing the inner peripheral surface of the hole of the object to be measured and a plurality of second air nozzles facing the end surface of the object to be measured is provided, and the back pressure of each air nozzle changes. In the measurement device equipped with a pressure detector for detecting the A first connection state in which a pair of air nozzles located in the same plane and facing oppositely is connected to each other to guide back pressure from both nozzles to one pressure detector; The present invention is characterized by being provided with a switching means capable of switching to a second connection state in which a pair of air nozzles located in two planes and facing oppositely are connected to each other and the back pressure of both nozzles is guided to one pressure detector. measuring device.