JPS5840246A - Method for detecting cutter tip damage - Google Patents

Abstract

PURPOSE:To eliminate the noise caused by chips and improve detection accuracy, by installing an AE (acoustic emission) sensor detecting an AE signal in a fixed angular table securing a workpiece, in a case of the above captioned detecting method which makes full use of said AE signal. CONSTITUTION:An AE sensor generator set 3 is installed in a fixed angular table securing a workpiece 2 of a milling machine A while an attachment 7, an AE sensor 8, an amplifier 9, a power source 10 and a small radio transmitter 11 are built in the generator set 3. When the workpiece 2 set fast to the fixed angular table 1 is cut with a tip 4 attached to a cutter 5, if the tip 4 is broken down and an AE signal is therefore emitted from the generator set 3, the AE signal is received by a radio receiver 12 located somewhat away from the milling machine A. The received AE signal turns to an alarm signal which is emitted by an alarm 15 via an AE detection amplifier 13 and a signal output amplifier 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting scratches and uniformity on the cutting edge of a cutting tool using WaK for milling a workpiece with one machine machine κ.

In recent years, various Kusunoki machine tools have been automated and unmanned, and in particular, in Chungjin, technology is being actively promoted with the goal of increasing efficiency and refinement.

Under these circumstances, the efficiency of the machine tool is above 1!0, because it is not possible to easily detect damage to the cutting potter. . Cutting machine AO
In the case of mK Natsue, which is at the end of its service life due to progressive wear during damage,
If the unmanned KFi machine tool could not detect the ζ error, it would result in a large number of defects in the finish of the workpiece and the destruction of a part of the secondary KFi machine tool itself. I might wake up.

Conventionally, in order to prevent such gaps from occurring, the operator would occasionally monitor the shape of the cutting edge of the tool and replace the tool.

ζ is also being considered as a method for detecting wear elements of tools such as ζ, such as ζ, by directly or indirectly grasping the % constant image.

One of them is acoustic emission (▲c@
ustic Eahissiui ) signal (hereinafter simply referred to as K
A method using the AIE signal (abbreviated as AIE signal) has been proposed, but κ has not yet been put into practical use.

The seventh reason is L1 specific noise (cutting debris, etc.) t-A
Completely removed from the K value numbers and only missing 4Ii'ft
It is considered to be a rounding that has not been found to dam.

The present inventors have investigated a method for detecting damage to a cutting edge of a nine-tool using the above-mentioned MuIL (No. 1), in which damage caused by cutting chips, which has a large influence of 11tK, is all close to @ &mK among noises. As a result, they discovered that it would be better to install an AE sensor that detects AE signals in a fixing base that fixes the rigid material, and this led to the invention of Y/O.

An embodiment of the present invention will be described in detail below with reference to a milling machine used for milling a square material.

Fig. 1 Schematic diagram of a milling machine operator installing the AE sensor transmitter set 8 in the fixing base l that fixes the rigid material 2.
8 is a nine-cut view of the first wheel milling machine A viewed from the X direction, and during the AE sensor transmission set in 8, attachment 7, AI sensor? -8, increase @@9, power source 10 and fixing base IK fixed 9 workpiece material 2 is attached to cutter 6 when cutting with 9 tips (tool cutting edge) 4 while rotating simultaneously with main shaft 6, tip 4 is missing and 4
When a signal occurs, the information is transmitted from the 9^E sensor transmission set 8, which is installed in the fixed base 1 of the milling cutter mA.

That is, the generated 9 AEI No. 1 passes through the attachment 7 of the AH 7-na-IRi communication set Hatanaka and enters the AIC sensor 3, and the AK sensor of 9 is increased by the Is device to increase the electric power 1.
110) No IIi in operation! It is transmitted as information by the transmitter 11.

And the envious mu-e signal was
The signal is received by the wireless receiver 12 installed at a distance of 9. This #l-receiver 124C is connected to the amplification amplifier 18, signal output amplifier 14, and information device 1b as shown in the mechanical diagram in Figure 4, so the AE signal received by the receiver 12 is ,.

It is increased by 18 amplification amplifiers, and the alarm 4ei is output through the signal output amplifier 14! 16, where the wear of the tip and the defective iAE value are detected.

Furthermore, since the detection method of the present invention hardly detects any cutting debris noise, it is possible to detect the degree of AE*v'i glaze caused by defects with good accuracy.

On the other hand, in the conventional method of detecting a chipped tool edge during milling by using an E flaw signal, the AE flaw signal generation source is in the tool edge, so the AE sensor must be installed at the tool edge. There is an idea that it is, and it is always cutlery III.
The first KAE sensor was installed.

However, most of the cutting debris generated is from the rounded edges of the chips, and with the AE sensor installed at the tool blade @9, it was impossible to prevent the mixing of cutting debris noise.

In addition, the AH signal due to the chip cutting edge is easily affected by a sudden attack on the transmission path until it is sensed by the AH sensor/cer.

When Allr occurs at the cutting edge of the chip, it is transmitted through the inside of the tool, the interface between the tool and the chip holder, and the inside of the holder, resulting in AE*.
Received at 7t-. In this case, the interface between the tool and the chip holder cannot always be kept in a stable constant state due to IIIA mechanical vibrations accompanying tool exchange and cutting. Therefore, the muE signal is likely to be severely attenuated at the interface between the tool and the tip holder, so it is difficult to receive it constantly.

This invention solves these problems by installing an AH sensor on the side of the rigid material.

In other words, most of the cutting debris is on the cutting edge of the tool on the driving side, and the cutting debris noise generated by the workpiece material is very small.
These small noises can be easily removed by the bandpass filter of the tiAE# knowledge circuit.If the 7-ner is installed in the cutting table, it will not be affected by the change in contact tFvjJ when changing the tool. In addition, since the A sound signal is transmitted by the small wrinkle radio and received by the receivers located at the distance 9 and ζ, it is stable and is not affected by changes due to tupple during mechanical vibration of the device itself. Therefore, the AK flaw signal can be extracted using the same method, and the detection sensitivity can be significantly improved.

Furthermore, there is little possibility that a chipping signal will be generated after the cutting edge of the tool breaks away from the rigid material, and even in such a situation, the tool is likely to chip the next time it comes into contact with the rigid material. II of 1 mostly generates AHH loss signals, so there is no problem in practical use. Figure 6 shows the damage t-AE signal of the tool cutting edge in the intermittent test, which was detected using the conventional method. Figure xi shows a waveform tube with a fixed waveform, and shows a good result when the method of the present invention is used.

In other words, the tool No. E-(
AE4M (Die Engage) S occurs and the tool tip escapes from the rigid material.
' occurs.

However, in the AHH waveform of the conventional method shown in Fig. 5, noise N due to cutting debris and damage signal H are received between engagement S1 and engagement S', and it is not possible to clearly distinguish when the damage occurred. Depending on the method of invention d1
Since only the damage signal H can be extracted, it is possible to easily detect h-light damage. Engagement S1, engagement S', and engagement S' are smaller than those caused by damage, so they can be distinguished.

As described above, according to the method of the present invention, damage to the camphor on the cutting edge of a tool can be determined with high precision without being affected by noise from other sources, and therefore, unmanned machine tools can be operated with high precision. Therefore, its excipient value aFi is very large.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the method of the present invention, and is a side view of a milling machine in which an AE sensor transmitter set is installed on a metal circle. Fig. 8 is a schematic diagram showing the configuration of the AH sensor transmission set, Fig. 4 is a schematic diagram showing the arrangement of the receiver and alarm equipment set at nine positions away from the milling machine, and Fig. Fi FIG. 6 is a graph showing the AHH signal waveform at the conventional AH signal detection pressure. FIG. A...Milling machine, l...Fixed stand, 2...
W cutting material, 8...AH sensor transmission set, 4...
・Chip, 5...Cutter, 6...Spindle, 7.
...Attachment, 8...AH-Ni-cer, 9
...Amplifier, 10...Power supply, 11...Small fish II! Transmitter, 12... No IIM father 1b device, 18
...Amplification amplifier, 14...Signal output amplifier, 1
5... Expense report device. Patent applicant: Sumitomo Electric Industries, Ltd.
Agent: Patent Attorney Kazu 1) 1952 Figure 1 Figure 2 Figure 8 Figure 6 Figure 6 @

Claims (1)

[Claims] In a method for detecting an acoustic Emin 7B value number caused by Kmlml light damage during milling of a workpiece with a cutting tool, an acoustic Emin 7B sensor, an amplifier, No small bath
I! A transmitter is installed, and a receiver is installed at a distance to receive the acoustic telephony signal, and the received signal is amplified and sent as an output signal to the transmitter. Do something to inspire yourself
-Featured tool edge damage detection method.