JPH0763545A - Hole position measuring probe for work, and hole position measuring device - Google Patents

Abstract

PURPOSE:To provide a hoe position measuring prove suitable for the precise measurement of the position of the part mounting hole of a work, and a hole position measuring device using it. CONSTITUTION:In a hole position measuring probe 10, a tapered head pin 11 is held on the top end of a head pin support member 14 supported so as to be capable of rolling with an inclination by a spherical bearing 13 in such a manner as to be capable of axially sliding, the head pin 11 is energized to advance in the top end direction by a spring 20, the inclining direction and inclining amount of the head pin support member 14 are detected by off-center sensors 40A, B, and the insertion of the head pin 11 in a prescribed state is detected by a positioning sensor 21. The head pin 11 of the probe 10 is inserted to a hole to be measured, the inclination of the head pin support member 14 is measured by the off-center measuring sensors 40A, B, and the hole position is measured on the basis of the position information of the head pin 11 when the detection signal of the positioning sensor 21 is outputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole position measuring probe and a hole position measuring device for measuring the position of a hole formed in a work, for example, a bogie frame of an automobile for mounting a suspension mechanism part of a wheel. The present invention relates to a device suitable for measuring the position of a bolt hole for mounting a component, which is bored in the.

[0002]

2. Description of the Related Art When a plurality of bolt holes formed in a work are used to attach a plurality of related parts to the work to form a desired mechanism, the relative positions (three-dimensional positions) of the plurality of holes are set. Any errors will cause the assembled mechanism to be different than desired. In particular, in the case of a large-sized work such as a bogie frame of an automobile, an error in the position of the component mounting hole cannot be avoided due to restrictions in manufacturing and processing work.

Therefore, conventionally, an error in a hole position for mounting a component on a work is measured in advance, and when the component is mounted, an adjusting member such as a shim is interposed so as to absorb the error. There is.

In order to perform such adjustment efficiently,
It is necessary to accurately measure the position of the hole for attaching the work part, and to determine the required shim shape and thickness based on this. Conventionally, for example, when measuring the hole positions for mounting the suspension mechanism parts of the front wheels formed in the bogie frame of an automobile, alignment measurement jigs in which measurement probes are arranged corresponding to the positions of a plurality of holes to be measured, respectively. It has been practiced to form a tool, place the jig at a predetermined position on the trolley frame, and measure the hole position by mechanical contact detection and displacement measurement with a measurement probe.

[0005]

However, according to the above-mentioned conventional technique, the measurement jig is set to a predetermined size because the surface shape of the carriage frame on which the alignment measurement jig is mounted is not accurate. Since the posture cannot be stably held, the positional relationship between the hole to be measured and the measurement probe is not stable. Therefore, there is a problem that the hole position cannot be accurately measured.

An object of the present invention is to provide a hole position measuring probe suitable for accurately measuring the position of a component mounting hole of a work and to provide a hole position measuring device using the same.

[0007]

In order to achieve the above object, the hole position measuring probe of the present invention comprises a head pin having a base portion having a diameter larger than that of the hole to be measured and having a diameter reduced toward the tip. A head pin support member that holds the head pin slidably in the axial direction, a biasing unit that biases the head pin forward in the tip direction of the pin, a spherical bearing that tiltably supports the head pin support member, and a head pin support member. A misalignment sensor that detects the tilt direction and the tilt amount, and a positioning sensor that detects that the head pin has retracted a certain amount are provided.

Further, the hole position measuring device of the present invention uses the above hole position measuring probe and holds the work position measuring device for holding the work to be measured at a predetermined position and the hole position measuring probe in a predetermined posture. And a probe moving device that moves to an arbitrary three-dimensional position, and an arithmetic control device that controls the position of the hole position measuring probe via the probe moving device and calculates the hole position based on the control result. The probe moving device holds the hole position measuring probe in a posture in which the tip of the head pin is orthogonal to the hole surface to be measured, and the arithmetic and control unit presets the hole position measuring probe for each hole to be measured via the probe moving device. The output of the misalignment sensor is captured while the hole position measuring probe is moved forward, and the detected output is within the set range. Correct the position of the hole position measuring probe, stop the movement of the hole position measuring probe in response to the detection output of the positioning sensor, and calculate the hole position based on the position information of the hole position measuring probe at the stop position. The configuration is as desired.

In this case, the hole position measuring probe includes an insertion detecting rod which is slidably held in the axial direction of the head pin and is held by the head pin supporting member with its tip positioned between the base portion and the tip of the head pin. , A second urging means for urging the insertion detecting rod forward in the forward direction, and a displacement sensor for detecting the displacement of the insertion detecting rod, and the arithmetic and control unit is configured to detect the hole position based on the output of the displacement sensor. It is preferable to recognize that the head pin of the measuring probe has been inserted into the hole.

Further, the probe moving device is provided with a probe posture adjusting device for adjusting the hole position measuring probe to an arbitrary posture, and the arithmetic and control unit determines the posture of the hole position measuring probe through the probe posture adjusting device so that the tip of the head pin is The configuration may be such that the posture is controlled to be orthogonal to the hole surface of the measurement target.

[0011]

With the above-mentioned structure, the present invention can achieve the above object by the following operation.

First, the head pin of the hole position measuring probe is brought close to the hole of the workpiece to be measured and is held so that the tip end thereof is orthogonal to the hole surface. Next, the head pin is inserted into the hole while advancing the entire probe. At this time, if the axial center of the head pin and the hole core deviate from each other, the side surface of the head pin comes into partial contact with the inner surface of the hole, and the reaction force tilts the head pin support member with the spherical bearing as the fulcrum. The direction of this tilt represents the misalignment direction, and the magnitude of the tilt represents the magnitude of misalignment.

On the other hand, when the head pin is inserted until the entire side surface of the reduced diameter portion contacts the inner surface of the hole, the axis of the head pin and the hole core are substantially aligned. This matching state can be detected by detecting that the head pin retracts a certain amount because the head pin retracts when the head pin comes into contact with the work and the reaction force becomes larger than the biasing means.

Therefore, by measuring the direction and magnitude of the inclination of the head pin support member in the state in which the detection signal is output from the positioning sensor, the misalignment detection sensor measures the relative displacement between the hole position measurement probe and the hole. Can be measured.

However, when the head pin support member is tilted, the head pin is obliquely inserted into the hole, so that the axis of the head pin does not exactly coincide with the hole core.

Therefore, the holding position of the hole position measuring probe is adjusted so that the output of the misalignment detection sensor becomes zero, and the position of the hole position measuring probe from the position of the hole position measuring probe in the state where the axis of the head pin is aligned with the hole core. Is preferred.

If there is an error (tolerance) in the hole diameter of the object to be measured, the insertion amount of the head pin in the axial direction with respect to the hole fluctuates, so that the relative position between the hole surface and the hole position measuring probe fluctuates, and the measurement is performed. There is an error.

Therefore, an insertion detecting rod is provided slidably in the axial direction of the head pin and supported by a head pin supporting member, and the tip of this rod is positioned between the base and the tip of the head pin, and the insertion detecting rod is It is preferable to provide a displacement sensor that biases the tip in the forward direction and detects the displacement of the insertion detecting rod. According to this, since the relative position of the hole surface and the hole position measuring probe can be measured by the displacement sensor, the position measurement error due to the hole diameter error can be eliminated.

On the other hand, according to the hole position measuring device of the present invention,
Hold the hole position measuring probe having the above action in the probe moving device, and drive the probe moving device by the arithmetic and control unit so that the output of the misalignment detection sensor becomes zero, and set the axis of the head pin to the hole core. The hole positions can be calculated and the hole positions can be calculated based on the known mechanical positional relationship such as the moving amount of the hole position measuring probe and the initial position at that time.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hole position measuring device according to an embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the positions of the component mounting holes formed in the truck frame of the truck are measured. In particular, in the case of holes for mounting parts that make up the suspension mechanism for the front wheels, the error in the position of each hole with respect to the frame and the error in the positional relationship between the holes are
It is necessary to measure the hole position with high accuracy because it may cause errors in camber angle and caster angle that affect running stability and maneuverability. 1 and 2 are views showing an embodiment of a hole position measuring probe (hereinafter, simply referred to as a probe) 10, FIG. 1 is a plan view showing a part of a section, and FIG. 2 is a partial view. It is the front view which fractured | ruptured and was shown. Figure 3
FIG. 4 is a plan view showing an overall configuration of an embodiment of a hole position measuring device for a bogie frame, and FIGS. 4 and 5 are partially enlarged views. FIG. 6 is a control system configuration diagram centering on the arithmetic and control unit,
FIG. 7 is a flowchart showing the processing procedure of the arithmetic and control unit. FIG. 8 is a state diagram for explaining the operation of this embodiment.

The configuration of the probe 10 will be described with reference to FIGS. The head pin 11 is formed in a taper shape having a cylindrical base portion and a conical tip portion. The base of the head pin 11 is set to have a diameter larger than that of the hole to be measured. A flange 18 is attached to the base of the head pin 11. The cross section of the head pin 11 is not limited to a circular shape, and may be a cross shape or a polygonal shape. Depending on the shape of the hole to be measured, it may be oval.

The head pin 11 is a head pin support member 12
It is held freely slidably in the axial direction. The head pin support member 12 is formed in a hollow cylindrical shape, and its base portion is a spherical bearing 1.
The tip end of the probe rod 14 supported by 3 is screwed with its axis aligned. A flange 15 is attached to the tip of the head pin support member 12. A sleeve 16 is fitted on the inner surface of the cylinder.

A slide pin 17 is inserted into the sleeve 16 so as to freely slide in the axial direction. This slide pin 1
Reference numeral 7 is screwed to the base of the head pin 11 so that its axis is aligned. The flanges 15 and 18 are arranged facing each other.
A plurality of guide pins 19 fixed to the flange 18 are inserted into the through holes provided in the flange 15, so that the flange 18 is supported so as to be slidable in the axial direction with respect to the flange 15. In addition, a compressed spring 20 is interposed between the flanges 15 and 18 to bias the head pin 11 forward in the forward direction.

A positioning sensor 21, which is a proximity sensor, is attached to the flange 15 so as to face the flange 18. As a result, it is detected that the head pin 11 has retracted a certain amount.

A slide rod 22 constituting an insertion detection rod is supported on the flanges 15 and 18 so as to be freely slidable in the axial direction of the head pin. The contactor 23 at the tip of the slide rod 22 is provided so as to be located between the base of the head pin 11 and the tip, and the stopper 24 at the rear end is engaged with the back surface of the flange 15. In addition, a compressed spring 25 is interposed between the flange 18 and the contact 23 as an urging means for urging the slide rod 22 forward in the forward direction. Further, a displacement sensor 26 that detects the amount of displacement of the slide rod 22 is arranged facing the stopper 24.

The rear end of the probe rod 14 is connected to a slide shaft 31 via a universal joint 30. The slide bearing 32 that supports the slide shaft 31 and the spherical bearing 13 are supported by a housing 33 that surrounds the entire probe rod 14 with their axes aligned.
A spring housing 35 to which a spring adjusting screw 34 is screwed is arranged on the rear end side of the slide shaft 31, and the slide shaft 31 is pulled to the rear end side by a spring 36 stretched between the slide shaft 31 and the spring adjusting screw 34. There is.

The misalignment detection sensor for detecting the inclination of the head pin support member 12 is mounted on the probe rod 14 at a mechanical angle of 9 degrees.
It is composed of a pair of misalignment detection sensors 40A and 40B which are arranged with a 0 degree phase shift. This misalignment detection sensor 40
A and B are attached to the housing 33, and a laser distance sensor for measuring the position from the sensor position to the surface of the probe rod 14 is applied.

Next, the structure of the hole position measuring device for the bogie frame using the probe 10 as described above will be described.

As shown in FIG. 3, the truck frame 50 of the truck is placed upside down on the conveying jig 60 and conveyed to the hole position measuring area. The trolley frame 50 includes a pair of side members 51, 52 that are symmetrically arranged.
And a plurality of cross members 53 to 58 that are provided so as to bridge the above.

With respect to the carriage frame 50 being conveyed,
Front positioning devices 61 and 62 and rear positioning devices 63 and 64 having the same configuration are arranged before and after the left-right symmetrical position, respectively.

The front positioning devices 61 and 62 include a front end positioning stopper 65 that determines the position of the tip of the frame and a positioning head 66 that determines the positions of the side members 51 and 52.
It is configured to include. Tapered positioning pins 67 are attached to the tip of the positioning head 66, and these pins are inserted into reference holes formed at predetermined positions of the side members 51 and 52 for positioning. . The front end positioning stopper 65 and the positioning head 66 are mounted on the same table 68.
8 is moved forward and backward by a cylinder 69 such as a hydraulic cylinder for positioning.

The rear positioning devices 63 and 64 include a positioning head 73 mounted on a table 72 which is moved forward and backward by a cylinder 70 such as a hydraulic cylinder. The positioning head 73 is moved forward and backward by the cylinder 70 to perform positioning. It is configured.

The positioning devices 61 to 64 can be automatically operated according to the type of the carriage frame 50 by a positioning control device (not shown).

The hole position measuring device of this embodiment shown in FIG.
The positions of the link mounting holes of the suspension mechanism for the front wheels, which are drilled around the third cross member 55 from the tip, are the measurement targets, and the left and right positions of the bogie frame 50 correspond to these hole positions. It is located in. Since the hole position measuring devices have the same structure except that they are symmetrical, the structure of one hole position measuring device will be described in detail.

The hole position measuring device comprises a probe 10, a probe moving device 80, and an arithmetic and control unit 100. The probe moving device 80 is engaged with a base 81, a slide table 82 mounted on the base 81 so as to be slidable in the Y-axis direction shown in the figure, and engaged with the slide table 82 so as to be slidable in the X-axis direction shown in the figure. A slide stand 83, a slider 84 slidably engaged with the slide stand 83 in the Z-axis direction, and a slider 8
4 includes a slide arm 85 slidably engaged in the Y-axis direction, and a probe support head 86 engaged at the tip of the slide arm 85 rotatably in the XY plane about the Z-axis. The probe 10 is attached to the probe support head 86.

The slide table 82 is moved in the Y-axis direction on the base 81 by a cylinder 87 such as a hydraulic cylinder. The slide stand 83 is engaged with a ball screw rotated by the X-axis drive motor 90, and is moved in the X-axis direction by this. The slider 84 is engaged with a ball screw rotated by the Z-axis drive motor 91, and is moved in the Z-axis direction by this. The slide arm 85 is engaged with a ball screw rotated by the Y-axis drive motor 92, and is moved in the Y-axis direction by this. The probe support head 86 is rotated in the XY plane about the Z axis by the A axis motor 93.

A rotary encoder is integrally incorporated in each of the motors 90 to 93, and the arithmetic and control unit 100 described later is provided.
Can determine the XYZ coordinate position of the probe 10 based on the rotation angle data input from the rotation encoder of each motor.

The arithmetic and control unit 100 for hole position measurement is shown in FIG.
, A central processing unit (CPU) 101,
Memory 102 and input / output interfaces 103, 10
4 is included. CPU 101 is memory 10
7 according to the program stored in 2 and the necessary data and sensor output specified by the program.
The calculation control processing relating to the hole position measurement shown in is executed. In the memory 102, the number N of holes to be measured and the design reference position (Xio, Y) of each hole Ni are determined for each type of the bogie frame 50.
io, Zio), the initial measurement position of the probe 10 (X
i ', Yi', Zi ') are stored. Probe 1
The position of 0 is set with reference to the flange 15 of the probe 10, for example.

The arithmetic and control unit 100 has an input device 110 such as a keyboard via an input / output interface 103.
Is connected to the host control system 130, and various initial setting data and commands can be input by these. Further, the respective detection outputs of the misalignment detection sensors 40A and 40B provided in the probe 10, the positioning sensor 21, and the displacement sensor 26 are output to the CPU via the input / output device 103.
101 is input.

A cylinder 87 of the probe moving device 80,
The motors 90 to 93 of the respective axes are driven and controlled by the driver 120, and their drive commands are given from the CPU 101 via the input / output interface 104.

The position information of the slide table 82 driven by the cylinder 87 is input to the driver 120 from a position sensor (not shown), and the slide table 8 is moved.
In addition to being fed back to the position control of No. 2, the rotation angle information of each of the motors 90 to 93 is input to the driver 120 from a rotary encoder (not shown), fed back to the position control of the probe 10 by each motor, and an input / output interface. CPU 10 through 104
Input to 1.

The operation of the embodiment thus constructed will be described below with reference to the flow chart shown in FIG. 7 and the operation state diagram shown in FIG.

When the bogie frame 50 is conveyed to the hole position measuring area, the positioning devices 61 to 64 operate to position the bogie frame 50 at a predetermined position according to the type of the bogie frame 50. Since this positioning operation is not a feature of the present invention, detailed description thereof will be omitted.

The arithmetic and control unit 100 starts its operation when a hole position measurement start command is input from the input unit 110 or the host control system 130. First, in step 201, the process waits until the type of the truck frame 50 is input. When the type is input, the process proceeds to step 202, the number N of holes to be measured corresponding to the type of the carriage frame 50 is fetched from the memory 102, and the counter i is initially set to an initial value “1” in step 203. Go to step 204.

In step 204, initial data regarding the hole identification number i is read from the memory 102. In the case of the present embodiment, the measurement initial position (Xi ', Y of the probe 10
i ', Zi') and the posture information Pi are read out.

In step 205, a drive command is first output to the cylinder 87, and the slide table 82 is moved forward from the storage position to a predetermined measurement position in the Y-axis direction which is predetermined. Then, drive commands for the X-, Y-, and Z-axis motors 90 to 92 are output, the position of the probe 10 is moved to the measurement initial position (Xi ′, Yi ′, Zi ′), and the A-axis motor 93 is set. The probe 10 is driven to match the posture of the probe 10 with the posture information Pi. In the case of this embodiment, as shown in FIGS. 4 and 5, a plurality of holes 96 formed in the side surface of the side member 52.
Since the core of the hole is limited to the Y-axis direction and the X-axis direction like the hole 97 formed in the side surface of the cross member 55, the posture of the probe 10 is XY as shown in these figures. Adjust by rotating 90 degrees in the plane. In this way, the state in which the measurement initial position and posture are moved is shown in FIG.
Is. In addition, in FIG. 8, in order to make the operation of the probe 10 easy to understand, it is shown by a skeleton.

Next, in step 205, the probe 1
0 is the hole direction (Y-axis direction in the case of FIG. 4, X in the case of FIG. 5)
(Axial direction) at a slight speed. This allows the probe 1
The 0 head pin 11 is inserted into the hole 96. At this time,
When the shaft center of the head pin 11 and the hole center of the hole 96 are displaced,
As shown in FIG. 8B, the head pin 1 is attached to the side surface of the hole 96.
The side face 1 is one-sided, and the probe rod 14 including the head pin 11 is inserted while tilting with the spherical bearing 13 as a fulcrum.

Therefore, in step 207, the detection outputs of the misalignment sensors 40A and 40B are fetched, and the probe rod 14
The presence or absence of the inclination is determined, and if the inclination is detected, the direction and magnitude of the inclination are decomposed into two axial components based on the detection outputs of the misalignment sensors 40A and 40B. That is, when moving forward in the Y-axis direction, the magnitude of the inclination in the other two-axis directions (Δ
X, ΔZ).

Then, in step 208, the ΔX, Δ
A drive command is output to the motors 90 to 92 of the respective axes so as to remove Z, and the process returns to step 206. In this way, while repeating steps 206 to 208, the head pin 1
1 is inserted straight into the hole 96. As a result, the head pin 11 is in a state of being fully inserted into the hole 96 as in the state shown in FIG. 8C, and when the probe 10 is further advanced, the spring 20 is compressed and the flange 18 is formed. When the positioning sensor 21 approaches the positioning sensor 21 and approaches a predetermined fixed distance, the positioning sensor 21 outputs a detection signal.

If it is determined in step 207 that the probe rod 14 is not tilted, step 20
In step 9, it is determined whether the detection signal of the positioning sensor 21 is input. If this judgment is negative (NO),
Since the head pin 11 is not fully inserted into the hole 96, the operation returns to step 206 and the operation is repeated.

When the determination in step 209 is affirmative (YES), the output of the displacement sensor 26 is fetched in step 210 to determine whether the slide rod 22 is displaced. That is, if the head pin 11 is inserted into the hole 96, the contact 23 hits the side surface of the carriage frame 50,
As the probe 10 advances, the slide rod 22 compresses the spring 25 and retracts. Therefore, if the displacement sensor 26 detects the displacement of the slide rod 22, it can be determined that the head pin 11 is correctly inserted into the hole 96.

On the contrary, if the displacement sensor 26 has not detected the displacement of the slide rod 22, the head pin 11
In this case, the tip of the hole is in contact with the side surface of the bogie frame 50, and therefore the hole position cannot be measured correctly, so an alarm is issued and the measurement is stopped.

When the determination at step 210 is affirmative, the routine proceeds to step 211, where the position of the hole 96 is calculated. This calculation is based on the initial position (Xi ′, Y) of the probe 10.
i ′, Zi ′) as a reference, the present position (Xi, Yi, Zi) of the probe 10 is obtained by making corrections by the movement amounts of the probe 10 in the X, Y, and Z axis directions in the above measurement operation.
Then, based on the amount of displacement detected by the displacement sensor 26, the distance L from the reference surface of the flange 15 to the surface of the bogie frame 50.
Then, this distance is added to the value of the corrected position of the probe 10 in the corresponding axial direction (Y axis in this example) to determine the position of the hole 96.

Then, the position information of the hole 96 obtained by the measurement in step 212 is stored in a predetermined area of the memory 102. Then, in step 213, it is determined whether or not the measurement of all holes to be measured is completed, and if not completed, the counter i is incremented in step 234, and the process returns to step 204 and the other hole positions are similarly measured. Then
The result is stored in a predetermined area of the memory 102, and the process ends.

The hole position measurement data stored in the memory 102 is output to the output device 14 such as a CRT or a printer as needed.
Output to 0. Further, the arithmetic and control unit 100 can be configured to determine and output the thickness and shape of the shim necessary for adjusting the caster angle and the camber angle of the front wheel suspension mechanism based on the measurement result of the hole position. is there. Also,
It is also possible to transfer those measurement results and the obtained shim information to the upper control system 130.

The spring 36 of the probe 10 holds the axes of the head pin 11 and the probe rod 14 straight in a predetermined state with respect to the probe 10 by its spring force.

In addition, the head pin 1
In order to prevent the 1 and the probe rod 14 from swinging due to vibration or the like, a rod clamp 38 for restraining the movement of the probe rod 14 is provided as shown in FIGS.

As described above, according to this embodiment,
The position of the link mounting hole of the front wheel suspension mechanism formed in the truck frame of the truck can be automatically measured with high accuracy.

As a result, the thickness and shape of the shim necessary for adjusting the caster angle and the camber angle of the front wheel suspension mechanism can be determined with high accuracy, and the reliability of quality control is improved.

In the above embodiment, the distance L from the reference surface of the flange 15 to the surface of the carriage frame 50 is calculated based on the displacement detected by the displacement sensor 26, and this distance is added to the current position of the probe 10. The position of the hole 96 is calculated. However, as shown in FIG. 9, when the relative positional deviation (ΔL) between the head pin 10 and the hole 96 due to the tolerance of the hole 96 is small enough to be ignored, a predetermined distance L ′ should be added to the current position of the probe 10. You may In this case, the displacement sensor 26 can be omitted, but in order to leave the determination in step 210 of FIG.
It is possible to apply a simple one that detects whether or not is displaced by a certain amount or more.

Further, in the above embodiment, the range in which the posture control of the probe 10 is rotated by 90 degrees in the XY plane is shown, but the present invention is not limited to this. For example, the probe support head 86 is set to the A-axis and
If it is formed so as to be rotatable around the axis, it is possible to measure the position of a hole formed in an arbitrary three-dimensional surface. Furthermore, the probe moving device 80 can be configured by a robot including a 6-axis control arm.

[0062]

As described above, according to the present invention,
It is possible to accurately measure the position of the workpiece mounting hole.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a hole position measuring probe of the present invention in a partial cross section.

FIG. 2 is a partially cutaway plan view showing an embodiment of a hole position measuring probe of the present invention.

FIG. 3 is a plan view showing the overall configuration of an embodiment of the hole position measuring device of the present invention.

FIG. 4 is an elevational view showing a state in which the position of a hole formed in a side member is being measured according to the embodiment shown in FIG.

FIG. 5 is a plan view showing a state in which the position of the hole formed in the cross member is being measured according to the embodiment of FIG.

FIG. 6 is a diagram showing a configuration of an arithmetic and control unit and a related control system according to the embodiment in FIG. 3;

FIG. 7 is a flowchart showing a control processing procedure of the arithmetic and control unit.

8A and 8B are schematic state diagrams illustrating the operation of the hole position measuring probe during measurement, where FIG. 8A shows a state at an initial position before the start of the measurement operation, and FIG. 8B shows a state during the measurement operation. 9C is a diagram showing a state at the time of completion of measurement.

FIG. 9 is a diagram for explaining the influence of the tolerance of the hole diameter on the relative positional relationship between the hole position and the hole position measuring probe.

[Explanation of symbols]

10 Hole Position Measuring Probe 11 Head Pin 12 Head Pin Supporting Member 13 Spherical Bearing 14 Probe Rod 15, 18
Flange 16 Sleeve 17 Slide pin 19 Guide pin 20 Spring 21 Positioning sensor 22 Slide rod 23 Contact element 24 Stopper 25 Spring 26 Displacement sensor 30 Universal joint 31 Slide shaft 34 Spring adjusting screw 36 Spring 38 Rod clamp 40A, B
Misalignment sensor 50 Bogie frame 51, 52
Side members 53 to 58 Cross members 60 Transfer jigs 61, 62 Front positioning device 63, 64
Rear positioning device 65 Front end positioning stopper 66 Positioning head 67 Positioning pin 68 Table 69, 70 Cylinder 72 Table 73 Positioning head 80 Probe moving device 81 Base 82 Slide table 83 Slide stand 84 Slider 85 Slide arm 86 Probe support head 87 Cylinder 90 X axis Drive motor 91 Z-axis drive motor 92 Y-axis drive motor 93 A-axis drive motor 96, 97
Hole 100 Control processing device 101 Central processing unit (CPU) 102 Memory 103, 104 Input / output interface 110 Input device 120 Driver 130 Upper control system 140 Output device

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[Procedure amendment]

[Submission date] August 31, 1993

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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Miyasugi 3-27-6 Shichirigahama Higashi, Kamakura City, Kanagawa Prefecture (72) Inventor Shinji Honda, No. 8 earthenware shelf, Fujisawa City, Kanagawa Prefecture Isuzu Motors Co., Ltd. Fujisawa Plant ( 72) Inventor Tatsuro Baba 2-12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd.

Claims (5)

[Claims] 1. A head pin having a base portion having a diameter larger than that of a hole to be measured and having a diameter reduced toward the tip.
A head pin support member that holds the head pin slidably in the axial direction; biasing means that biases the head pin forward in the direction of the tip of the pin; a spherical bearing that supports the head pin support member in a tiltable manner; A hole position measuring probe including a misalignment sensor for detecting a tilt direction and a tilt amount of a head pin support member, and a positioning sensor for detecting that the head pin has retracted a certain amount. 2. The head pin support member according to claim 1, wherein the head pin support member is slidable in an axial direction of the head pin,
An insertion detection rod provided with its tip positioned between the base of the head pin and the tip, a second urging means for urging the insertion detection rod forward in the tip direction, and a displacement of the insertion detection rod. A hole position measuring probe comprising a displacement sensor for detecting. 3. A workpiece positioning device that holds a workpiece to be measured at a predetermined position, a hole position measuring probe, and a probe that holds the hole position measuring probe in a predetermined posture and moves to an arbitrary three-dimensional position. A moving device and an arithmetic and control unit that controls the position of the hole position measuring probe via the probe moving device and calculates a hole position based on the control result, wherein the hole position measuring probe is a measuring device. A head pin having a base portion having a diameter larger than that of the target hole and having a diameter reduced toward the tip, a head pin support member for slidably holding the head pin in the axial direction, and advancing the head pin in the tip direction of the pin. Biasing means for urging, a spherical bearing that tiltably supports the head pin support member, and a tilt direction and a tilt amount of the head pin support member are detected. And the displacement sensor,
And a positioning sensor that detects that the head pin has retracted a certain amount, and the probe moving device measures the hole position in a posture in which the tip of the head pin of the hole position measuring probe is orthogonal to the hole surface of the measurement target. Holding the probe, the arithmetic and control unit moves the hole position measuring probe to an initial position preset for each hole to be measured through the probe moving device, and advances the hole position measuring probe. While the output of the misalignment sensor is taken in, the position of the hole position measuring probe is corrected so that the detection output is within the set range, and the hole position measuring probe is moved in response to the detection output of the positioning sensor. And the hole position configured to calculate the hole position based on the position information of the hole position measuring probe at the stop position. Measuring device. 4. The hole position measuring probe according to claim 3, wherein the probe is held by the head pin support member so as to be slidable in the axial direction of the head pin, and the tip is located between the base portion and the tip of the head pin. The insertion detection rod, a second urging unit that urges the insertion detection rod forward in the distal direction, and a displacement sensor that detects a displacement of the insertion detection rod. A hole position measuring device, characterized in that the head pin of the hole position measuring probe is recognized based on the output of the displacement sensor. 5. The probe moving device according to claim 3, further comprising a probe attitude adjusting device that adjusts the hole position measuring probe to an arbitrary attitude, and the arithmetic and control unit includes the probe attitude adjusting device. A hole position measuring device, characterized in that the position of the hole position measuring probe is controlled to a position in which the tip of the head pin is orthogonal to the hole surface of the object to be measured.