JPS58211897A - Device for investigating position of hole - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hole position detection device capable of detecting the position of a hole or the like for mounting parts on a workpiece.

[Technical Background of the Invention and Problems Therewith] In recent years, automatic assembly machines such as I-IT assembly machines have been widely used to improve production efficiency.

In these automatic assembly machines, in order to attach parts to a workpiece, it is necessary to accurately detect the hole position for the attachment. In particular, since current automatic assembly machines can only mount parts with a certain predetermined tolerance, detection of the hole position is important.

In this regard, in the case of precision processed products manufactured by cutting, polishing, etc., the workpiece itself is small and shaped, so
Positioning such as hole position detection is relatively easy.

However, in general consumer products, for example, which are mass-produced by sheet metal processing and do not require high manufacturing accuracy, it is extremely difficult to detect hole positions, etc. To do this, a very expensive positioning device must be provided for each product of different shape.

In addition, hole position detection devices consisting of optical sensors, etc., which have been used as eyes for NC machines and rosettes in recent years, are expensive and can only detect the position of the hole. Since the tilt cannot be detected, a separate and expensive device must be provided to detect the slope.

[Purpose of the invention]

The present invention has been made in view of these points, and provides a hole position detection device that can reliably detect the hole position of a workpiece and the inclination of the workpiece with respect to a reference, and can send the information to an automatic assembly machine, etc. The purpose is to provide.

[Summary of the invention]

The present invention detects a plurality of probe pins arranged parallel to each other and movable in the axial direction, the protrusion length of each probe pin from a reference position, and displays the protrusion status of all probe pins. It is formed by providing a protrusion length detection indicator.

When multiple probe pins of this camera are pressed against the hole of the workpiece, the protrusion length of the probe pins inserted into the hole remains unchanged, and the protrusion length of the probe pins that are in contact with the workpiece surface is pushed in. Saga short (Naru. And.

The state of the protruding length of each of these probe pins is displayed, and the position of the hole and the inclination of the workpiece are detected.

[Embodiments of the invention]

The present invention will be described below with reference to embodiments shown in FIGS. 1 to 7. .

FIG. 1 shows the whole of this embodiment, and the device of the present invention includes a plurality of probe pins 1.1 and each probe pin l.

10 and a protrusion length detection display 2 that detects and displays the protrusion length from the reference position.

To explain further, as shown in FIGS. 1 to 3, each probe pin 1, 1 is provided in a probe case 4 fixed to the tip of an arm 3 of an NC machine (not shown), which is an automatic assembly machine. There is. That is, the probe bins 1, 1 are arranged parallel to each other, and
The probe is installed so as to be freely movable in the axial direction, passing through the front surface 5 of the probe case 4 to 7. Each exploration bin/l, 1 has two bin guides 5a and 6b inside the exploration unit case 4.
It is horizontally suspended and pivotally supported by, and is pressed so as to protrude forward from the front surface 5 by the compressed spring 8. The protruding length of each probe pin 1°1 is determined using the front surface 5 as a reference plane.

The protrusion length detection indicator 2 detects the protrusion length by measuring the change in the resistance value according to the protrusion length of each probe pin 1, 1, and displays the state of the resistance value. pin 1
．． 1 is formed so as to display the protruding state of the whole.

That is, to explain one probe pin 1 shown in FIG. It is formed to measure the resistance value of the probe pin 1 between the probe pin 1 and the rear end of the probe pin 1. The probe pin l is made of a suitable resistive material. For this purpose, lead wires 10, 10 are led out from the sliding electronics 9 and the rear end, and are connected to an IC in a calculation section 11 (FIG. 1) in the main body of the protrusion length detection display 2. This calculation unit 11 determines the resistance value of each probe pin 1.1 and displays the resistance values of all probe bins 1.1 as shown in FIG. 5, for example. In FIG. 5, the X coordinate and the Y coordinate are the search points in the X direction and Y direction from the reference point P in FIG.

1, and the resistance value is for each exploration bit/1. It shows the resistance value according to the protruding length of l.

Next, the hole position detection effect according to this embodiment will be explained.

First, as shown in FIG. 3, a workpiece 13 having a hole 12 for assembling one part is positioned at an assembly position of an automatic assembly machine (not shown) using a positioning device button.

In order to accurately determine the position of this hole 12, the arm 3 is brought closer to the workpiece I3. As the workpiece 13 moves, each probe pin 1 protruding from the probe case 4
．． 1 gradually approaches the work 13, and finally the probe pins 1, 1 located in the hole 12 are inserted into the hole 12, and at the same time the probe pins 1, 1 located outside the hole 12 are inserted into the hole 12. It comes into contact with the wall surface of the work 13 and is pushed into the probe case 4 against the compression spring 8.

At this time, since the probe pins 1, 1 located in the hole 12 protrude more than the front surface 5, the distance h1t between the far end and the slider electron 7 is short, so that its resistance value is small. Conversely, the probe pin l located outside the hole 12.

Since the length of the protrusion from the front surface 5 of 1 is short, its resistance value is large. The magnitude state of this resistance value is measured by the calculation section 11 of the protrusion length detection display 2 and displayed for each probe pin 1.1 as shown in FIG.

Then, turn ON when the resistance value is smaller than a certain set value.
, is set to OFF when it is large, and the position of the hole 12 is accurately determined as shown in the shaded area in FIG.

After that, the coordinate data of this person 12 is sent to the automatic assembly machine, and after the arm 3 retreats, the parts to be assembled are placed in the hole 12.
and the necessary assembly work is performed.

Next, the tilt detection effect according to this embodiment will be explained.

For example, as shown in FIG. 7, the work 13 is glr,
When viewed from the top of Figure 3, the angle θ with respect to the X-Y plane,
Suppose it is tilted by −.

When each probe fon 1, 1 is brought into contact with the wall surface of the work 13, the two coordinates of the left end of the work 13 become zl, and the two coordinates of the right end become z2. In this case, the size relationship is z2>z□. Now, if the length in the X-axis direction between the left and right ends of the workpiece 13 is X□, θ becomes.

Here, z2. The coordinates of zl can be easily determined from the protrusion length K of the probe pins 1, 1, and Xl can also be easily determined as the difference between the X coordinates of the probe pins 1, 1 used for measurement, and by substituting these into the above equation. Then, θ is obtained.

The above equation describes the case of determining the inclination of the workpiece 13 with respect to the X-Y plane, but the coordinate data (X,
Y-Z plane in the same way from Y, Z).

The inclination with respect to the z-X plane can also be determined.

Note that if the work 13 is tilted, the work 1
It is best to hold 3 with an upright jig or the like so that it stands vertically.

〔Effect of the invention〕

Koriyo 51C The hole position detection device of the present invention can accurately determine the position of a hole in a workpiece, thereby making it possible to simplify the structure of the workpiece positioning device, and
It is possible to determine the inclination angle of the workpiece in three dimensions, and it is possible to detect and understand the state of the workpiece at all times. Optimal assembly direction command data can be provided, assembly accuracy can be greatly improved, and manufacturing with high commercial value can be achieved. In addition, it is possible to detect not only the hole position but also the position of the protrusion, etc., and it can also be used as a positioning device for large objects, so it lacks versatility.

[Brief explanation of the drawing]

The drawings show one embodiment of the hole position detection device of the present invention, and the first embodiment
The figure is a plan view showing the overall configuration, Figure 2 is a partially cutaway perspective view of the probe case, Figure 3 is a perspective view showing the probe pin etc. in the probe state, and Figure 4 is the protrusion length detection part of the probe pin. 5 is a perspective view showing the display state of the detection resistance value, FIG. 6 is a three-dimensional coordinate diagram showing the coordinates of the hole position, and FIG. 7 is a coordinate diagram showing the method for measuring the inclination of the workpiece. . l...Search pin, 2...Protrusion length detection indicator. 8... Compression spring, 12... Hole.

Claims (1)

[Claims] 1. A plurality of probe pins provided parallel to each other and pressurized so as to be movable in the axial direction. A protrusion length detection display device that detects the protrusion length of each probe pin from a reference position and displays the protrusion state of all probing pins. 2. Each probe pin is pressed in the protrusion direction by a compression spring, and the protrusion length detection indicator measures the resistance value of each probe pin, which changes according to fluctuations in the protrusion length of each probe pin. 2. The hole position detection device according to claim 1, wherein said protrusion length is detected.