JPS5892804A - Contact detector - Google Patents

Abstract

PURPOSE:To measure automatically the position and dimensions of an object to be detected with high precision, by detecting the collision sound, which is generated when a probe is brought into contact with the object to be detected, with a prescribed detecting sensor. CONSTITUTION:A probe 1 is provided with an AE sensor 2 which detects the collision sound generated by the contact between the probe 1 and an object to be detected, and the probe 1 is connected to a device body 4 through an acoustic wave intercepting material 3. The body 4 is attached to the tip of a main shaft 7 of a machining center, and a detecting part 5 and a transducer 55 are provided internally. The collision sound of the probe 1 is detected by the sensor 2 and is amplified in the detecting part 5, and acoustic waves from the transducer 55 are detected by an AE sensor 11 through the main shaft 7 and a housing 9. Respective parts of a worked part are detected by the similar method, and thus, positions of dimensions of respective parts are measured automatically on a basis of coordinates of the probe 1 stably and surely by detection of the collision sound.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on a contact detection device that detects a contact state from the sound of a collision between a glove and an object to be detected.

Recently, there has been remarkable automation in the field of machine tools, and along with this,
Automatic measurement has become important.

For this reason, it has conventionally been considered to use a contact detection device with a glove to accurately detect the contact of the probe with the product, that is, the object to be detected, and to measure the position and dimensions of the product using this detected information. There is.

As a conventional contact detection device, for example, a glove is supported by a spring, and pins protruding from three sides around the glove 4 are supported by V@ respectively, and when the glove touches the object to be detected and moves, the pins Someone opened the external circuit from VS and detected contact.
Made by isbaw.

■There is a device that detects contact by using the power that flows when the tip of the glove comes into contact with the object to be detected.

However, for the item ■, if the measurement load is reduced by spring 1J11f11, it is easy to receive the full effect of vibration, and conversely, the measurement load is 4f.
If I11t is increased, the detection error increases due to friction, and there is a drawback that the sensitivity (dead zone) varies depending on the contact angle between the probe and the object to be detected. Also ■
However, if water droplets or the like adhere to the surface of the object to be detected, the Il flow may flow through the water droplets, resulting in a large detection error.

This invention has been made to eliminate the above-mentioned drawbacks, and detects the collision sound generated when the glove comes into contact with the detected object VC, thereby detecting the contact between the glove and the detected object VC. It is an object of the present invention to provide a contact detection device that can detect accurately and stably and can contribute to highly accurate measurement of the position and dimensions of a detected object using the detected information.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the present invention applied to a horizontal machining center among machine tools.

In the figure, 1 is a probe IK that detects contact with the product, that is, the object to be detected, and this probe IK is a sensor that detects the sound wave caused by the collision sound that occurs when it comes into contact with the object A. , n) Senna 2
t-set ff.

(9) This probe 1 is installed in the main body 4 of the device via a sound fjL blocking material 3. In this case, the blocking material 3 has a large porosity and a small coefficient of thermal expansion, and is designed to block noise-like sound waves entering the globe IIIK from the device main body 4 side.

The device main body 4 is connected to the above AB sensor 2.
a detection unit 5 for detecting the output from the;

A power source for this detection 1i15, for example, a battery 6 is provided.

Here, as shown in FIG. 2, the detection unit 5 includes an amplification circuit 51 which amplifies the output from the sensor 2. A discrimination circuit 52 that discriminates the output corresponding to the collision sound from the output of the amplification circuit 51
．． A switching circuit 53 that is turned on based on the discrimination result of the discrimination circuit 52. An oscillator 5654 which is activated when this switching circuit 53 is turned on and a transducer 55f which generates sound m by the oscillation output of this oscillator 54:
have.

Such a device main body 4 is attached to the tip of the main spindle 7 by an ATO (automatic tool changer) of a machining center. In this case, the main shaft 7 has a cylindrical shape and is rotatably supported in a hollow part of a rectangular main shaft head housing 9 via a bearing 8, and a drawbar 10 having a gripper (not shown) at the tip is mounted in the hollow part of the main shaft 7. The gripper of the drawbar 10 is inserted into the pull stud 1 while being rotated about the main shaft 71.
01, and the main body 4 is inserted and fixed onto the main shaft 7.

On the other hand, a dampness sensor l11 for receiving sound waves from the transducer 55 is provided in the spindle head housing 9 as a receiving section.

Next, its effect will be explained.

Here, various tools are attached to the main shaft 7 of the 77-ning center depending on the processing of the product.

It is now assumed that a device main body 4 having the above-mentioned rounding glove 1 for measuring the processing dimensions of a product is attached. FIG. 1 shows this state.

In this state, when the main shaft 7 rises together with the main shaft head and housing 9 in the direction of the arrow shown in the figure, the tip of the globe 1 comes into contact with a desired surface of the object to be detected. Then, a collision sound is generated by this contact, and a t-wave caused by this collision fvC is detected by the Ag sensor 2. As a result, an output is generated from the AIl sensor 2, and this output is given to the detection unit 5ic of the main body 4. In the g detection unit 5, the output from the sensor 2 is amplified by the amplification circuit 51. Upon receiving the output, a discrimination circuit 52 discriminates the reproduction output according to the collision sound. Now, when the discrimination circuit 52 discriminates the output corresponding to the collision sound, the switching circuit 53 turns on and the camera 54 operates based on the discrimination result. Then, a sound wave is generated from the transducer 55 due to the oscillation output of the oscillator 54. This sound wave is the main body 4
It is transmitted to the housing 9 via the main shaft 7 and the bearing 8t, and detected by the Ag sensor 11 provided in the housing 9.

As a result, contact between the glove l and the detected object is detected from the output of the Ag sensor 11.

Thereafter, in the same manner, the glove 1 is brought into contact with each part of the processed part of the person to be detected, and the contact at this time is detected.

By detecting the coordinates of the probe l through this contact detection and determining the position of each part, it is possible to easily determine the machining dimensions of the object to be detected from these positional relationships.

Therefore, according to such a configuration, since the collision 11 that occurs when the glove l comes into contact with the human body is detected and the contact between the two is detected, it is possible to detect the collision between the two. Even if the contact angle with the detection object changes, contact between the two can be detected regardless of the contact angle.
Stable contact detection can be obtained. In addition, even if the object to be detected is contaminated with water 1, etc., the collision sound when the glove 1 comes into contact with the object to be detected is reliably detected, so detection is much easier than in the conventional method described in section ①. Accurate contact detection without errors can be obtained. As a result, the use of such contact detection information is extremely advantageous in measuring the position and processing dimensions of the object to be detected, that is, the eleven items, with high precision.

Further, according to this embodiment, when a collision sound is detected when the probe 1 comes into contact with a person to be detected, the oscillation 554 generates a sound wave again via the transducer 551, and this signal is sent to the receiving sensor IIK. contact detection. As a result, even if the contact detection device of the present invention is installed on the rotating side such as the main shaft 7, the sensor 1 can be installed on the housing 9 on the stationary side via the bearing 8t without any special measures.
1 can be taken out more easily. Also, the glove l
Since the sound wave blocking material 3t is interposed between the main body 4 and the main body 4, it is also possible to block the noisy sound waves t' transmitted from the main body 4gl to the pro nib 1, thereby increasing the precision of contact detection with the glove 1. You can also.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist.

For example, in the embodiment described above, the glove 1 is connected to the detected object Ai.
Detected when sensor 2 detects the collision sound upon contact s
5 oscillations! A sound wave is generated again from the I54 via the tiger 7 juicer 55, and this is sent to the reception sensor 11 provided elsewhere.
I tried to receive it at

A detection signal may be emitted into the air from the detector 5ri via the antenna, and this detection signal may be received by a receiver of the receiver. Further, the above-mentioned configuration is convenient for detection when installed on a rotating body, but for detection in a stationary state, it is only necessary to amplify and discriminate the detection output of the sensor 2 in the detection unit 5 and output it as is. . Furthermore, although the above description has been made regarding the application to machining centers of machine tools, it can also be applied to other machine tools such as lathes, grinders, etc.
The application to dimension #j fixed machines is also 9 symptoms.

As described above, according to the present invention, it is possible to accurately and stably detect the probe's contact with the temporary detection object by detecting the fluke in contact with the detection object, and the detection information Accordingly, it is possible to provide a contact detection device that can contribute to accurate measurement of the position and dimensions of an object to be detected.

[Brief explanation of the drawing]

FIG. 1 is a #1 schematic block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a detection section used in the embodiment. 1... Probe, 2...--A
B sensor, 3...Al11ll cut material, 4
......Device body, 5...Detection section. 51......Width amplification circuit, 52......
...Discrimination circuit, 53...Switching circuit, 54...Oscillator, 55......-
・Transducer, 6...Battery, 7.
・・・・・・・・・Main axis. 8... Bearing, 9... Housing, 10... Drawbar. 101・・・・・・7゛Rustad, 11...
...Muro sensor. A......Object to be detected

Claims (1)

[Claims] D) 70-b, a sensor installed on the glove and detecting a collision sound when the glove comes into contact with a detected object;
A contact detection device characterized by comprising: a device main body provided with the glove and having a detection section for detecting the output of the sensor. (2) Patent claim 1 characterized in that the probe is provided in the main body of the device via a sound tILJ section.
The contact detection device according to item 1. (3) The contact detection device according to item 1 or 2 of i1 for q# fraudulent claims, characterized in that the device main body has an electric wire for the detection section. (4) The detecting section of the main body of the device has an oscillator that is operated to oscillate by the output of the cell and a transducer that generates sound by the oscillating output of this oscillator. A contact detection device according to any one of claims 1 to 3, characterized in that: (5) The detection section of the main body of the device has an oscillator that is operated to oscillate by the output of the sensor and an antenna that emits the oscillation output of this oscillator into the air, and the output from this antenna is designed to cause damage to the receiving section. That's q! fiIK
%tIf The contact detection device according to any one of claims 1 to 3.