JPH05212657A - Ultrasonic dimensional monitor - Google Patents

Abstract

PURPOSE:To provide an ultrasonic dimensional monitor which is able to improve the operation efficiency and machine a workpiece so well into a desired finishing size. CONSTITUTION:Ultrasonic waves out of an ultrasonic probe 1 installed in a cutting oil feeding nozzle 2 are propagated to a round bar 4 in making cutting oil flowing out of the nozzle 2 as a medium, and it is reflected at a surface 4a and a bottom surface of the round bar 4, while it is amplified by a pulser- receiver amplifier 7 as each of second and third reflected waves and inputted into a signal processor 8 which detects each input time of these inputted second and third reflected waves and measures a time difference T between respective peak values of both of them, thereby calculating a diametral size of the round bar 4. The calculated diametral size is displayed on a display unit 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic dimension monitoring apparatus used for a machine tool such as a lathe, and more particularly to an ultrasonic dimension monitoring apparatus capable of automatically measuring a dimension of a work piece.

[0002]

2. Description of the Related Art Generally, when a diameter of a work piece, for example, a round bar is machined by a machine tool such as a lathe to finish its diameter dimension to a desired diameter dimension, the work piece is previously cut before starting the machining. The diameter dimension of was measured with a micrometer or the like, and the actual machining diameter dimension was calculated from the measured dimension before machining and the feed amount of the cutting tool during cutting.

However, during the cutting process, the cutting work is temporarily stopped, the diameter dimension is measured, and if the finished dimension is not reached, the cutting process is continued again.

As described above, until the desired finish dimension is reached, the mid-cutting dimension is repeatedly measured to process to the desired finish dimension.

[0005]

However, in the above-mentioned conventional method for calculating the actual machining diameter size of the work from the feed amount of the cutting bit, the accurate actual diameter size is not always obtained due to the wear of the tip of the cutting bit. I couldn't ask. Therefore, it is necessary to temporarily stop the cutting work during the cutting process, measure the diameter dimension of the work piece with a micrometer, etc., and continue the cutting process again if the desired processing size is not reached. There is a problem that it is complicated and the work efficiency is low.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an ultrasonic dimension monitoring apparatus which has improved working efficiency and can be accurately machined to a desired finished dimension.

[0007]

In order to solve the above-mentioned problems, the present invention provides an ultrasonic probe in a cutting oil supply nozzle, and uses the cutting oil flowing out from the nozzle as a medium for the ultrasonic wave in a work piece. The ultrasonic wave from the probe is propagated, and the time of reflection of the ultrasonic wave from the surface of the workpiece and the time of reflection from the bottom surface of the workpiece are compared, and the dimension between the surface and the bottom surface of the workpiece is determined by the comparison result. It is characterized by being calculated and displayed.

[0008]

According to the present invention, the ultrasonic wave generated by the ultrasonic probe provided in the cutting oil supply nozzle is propagated to the work using the cutting oil flowing out of the nozzle as a medium. Calculate the dimension between the surface and the bottom of the work piece based on the result of comparison of the reflection time of the propagated ultrasonic wave from the surface of the work piece and the reflection time of the ultrasonic wave that has passed through the work piece from the bottom surface. And display it.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view showing a schematic structure of a main part of an ultrasonic dimension monitoring apparatus according to an embodiment of the present invention.

An ultrasonic probe 1 is mounted in the cutting oil supply nozzle 2. The probe 1 is arranged near the cutting oil outlet 2a of the nozzle 2 with its axis aligned with the central axis of the nozzle 2, and is fixed to the nozzle 2 by a plurality of setscrews 3 penetrating the peripheral wall of the nozzle 2. ing. Further, the nozzle 2 is attached so that the extension of the central axis thereof extends from the surface 4a of the round bar 4 as the work piece to the bottom surface 4b through the center point 4c as shown in FIG. On the other hand, the gap B is closely arranged so that the gap B becomes a predetermined distance (for example, 1 to 2 cm). On the other hand, the round bar 4 is fixed to a chuck of a lathe (not shown), and the cutting tool 5 is fixed to a tool rest (not shown) of the lathe.

At the time of cutting, the tool post is moved to bring the cutting tool 5 into contact with the round bar 4 to perform the cutting, and at the same time,
An appropriate amount of cutting oil 6 is flown out from the nozzle 2. At the time of this cutting, ultrasonic waves are emitted from the ultrasonic probe 1, and the ultrasonic waves propagate to the round bar 4 using the cutting oil 6 flowing out from the outlet 2a of the nozzle 2 as a medium.

FIG. 2 is a schematic block diagram showing the overall construction of the apparatus of this embodiment having the ultrasonic probe attached to the nozzle shown in FIG.

As shown in the figure, this apparatus is electrically connected to an ultrasonic probe 1 mounted in a nozzle 2 and a vibrator 1a of the ultrasonic probe, and supplies a vibration pulse to the vibrator 1a. At the same time, a pulser / receiver amplifier 7 that amplifies ultrasonic waves from the vibrator, a signal processing device 8 that processes the signal amplified by the amplifier 7 and calculates the size of the workpiece, and the calculated workpiece Display device 9 for displaying the dimension value of an object
It consists of and.

Next, the operation of this embodiment will be described with reference to FIG.

FIG. 3 is a waveform diagram showing an ultrasonic wave from the ultrasonic probe 1 and a reflected wave from the round bar 4.

During the cutting process of the round bar 4, the vibrator 1 is generated by the vibration pulse (FIG. 3 (1)) from the pulser / receiver amplifier 7.
a is excited to generate ultrasonic waves (FIG. 3 (2)). The ultrasonic waves emitted from the ultrasonic probe 1 enter the round bar 4 using the cutting oil 6 flowing out from the nozzle 2 as a medium.

Generally, an incident ultrasonic wave produces a reflected wave having a large signal level at an interface between objects having largely different acoustic impedances. Therefore, in this case, the ultrasonic wave is reflected by the interface between the ultrasonic wave transmission / reception port 1b of the ultrasonic probe 1 and the cutting oil 6 and is transmitted to the pulsar / receiver amplifier 7 via the ultrasonic probe 1 as the first reflected wave a. Sent (Fig. 3
(3)). Next, the ultrasonic wave is reflected by the interface between the surface 4a of the round bar 4 and the cutting oil 6 and is similarly sent to the amplifier 7 as the second reflected wave b (FIG. 3 (3)). Further, the ultrasonic wave passes through the round bar 4, is reflected by the interface between the bottom surface 4b and the cutting oil 6, and is similarly sent to the amplifier 7 as the third reflected wave c (FIG. 3 (3)).

These reflected waves sent to the amplifier 7 are amplified and input to the signal processing device 8. In the device 8,
Of these reflected waves, the input times of the second reflected wave b and the third reflected wave c are detected, and both detected reflected waves b and c are detected.
The time difference T (FIG. 3 (3)) between the respective peak values is measured. This time difference T is the reflection time from the oscillation time of the vibration pulse (FIG. 3 (1)) to the time when the ultrasonic wave is reflected back on the surface 4a of the round bar 4 and the reflection time from the time when it is reflected back to the bottom surface 4b. It is the time difference from the time. Therefore, the diameter difference of the round bar 4 is calculated by measuring the time difference T and multiplying this by the speed of sound propagating in the round bar 4 which is known in advance. The calculated value of the diameter dimension is displayed on the display device 9.

Therefore, the current diameter dimension of the round bar 4 can be grasped by successively calculating the diameter dimension during cutting.

In the above embodiment, an example in which the diameter dimension of the round bar 4 is calculated by the time difference T between the second and third reflected wave peak values obtained by each vibration pulse has been described. Second and third obtained by the vibration pulse of
It is also possible to measure the time difference between the peak values of the reflected waves of, and calculate the diameter dimension of the round bar from the average value of the obtained n time differences.
It is possible to further improve the calculation accuracy of the diameter dimension of the round bar.

[0022]

As described above, according to the present invention, it is not necessary to temporarily stop the cutting process during the cutting process and measure the dimension of the work piece each time during the cutting process. Since the size of the work piece being cut is calculated one by one using the reflected wave of the ultrasonic wave from the ultrasonic probe provided in, the working efficiency can be improved and the desired finished size can be accurately processed. ..

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a schematic configuration of a main part of an ultrasonic dimension monitoring apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram showing the overall configuration of an apparatus of this embodiment having the ultrasonic probe of FIG.

FIG. 3 is a waveform diagram showing an ultrasonic wave from an ultrasonic probe and a reflected wave from a round bar or the like.

[Explanation of symbols]

 1 Ultrasonic Probe 1a Transducer 2 Cutting Oil Supply Nozzle 4 Workpiece 6 Cutting Oil 7 Pulser / Receiver Amplifier 8 Signal Processor 9 Display

Claims (1)

[Claims] 1. An ultrasonic probe is provided in a cutting oil supply nozzle, and the ultrasonic wave from the ultrasonic probe is propagated in a work using the cutting oil flowing out of the nozzle as a medium, and the ultrasonic wave An ultrasonic dimension monitoring device characterized by comparing a reflection time from a surface of a workpiece and a reflection time from a bottom surface thereof, and calculating and displaying a dimension between the surface and the bottom surface of the workpiece based on the comparison result.