JP2000094272A - Cutting tool with wear-and-tear sensor having insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a sensor to a cutting tool even if a base material of the cutting tool is a conductive material, by forming a sensor thin film and terminal thin films on a surface of a non-conductive thin film formed on all the surface of the base material. SOLUTION: A sensor thin film 8 and terminal thin films 9, 9 are formed on a surface of a non-conductive thin film 7. The sensor thin film 8 comprises plural fine lines 10 having an even width and lying at even intervals. The plural fine lines 10 for detecting flank wear or chipping are disposed side-by-side in a extending state perpendicular to an advancing direction (f) of the flank wear occurring and growing on a flank, while all the fine lines 10 are connected to each other in parallel at both ends with the terminal thin films (parts) 9, 9 made of a conductive material. In this cutting tool 1 with a sensor, because the non-conductive thin film 7 covers a surface of a base material 2, the sensor thin film 8 made of a conductive material and the terminal thin films 9, 9 can be applied to the surface of the base material 2 even if the base material 2 is made of a conductive material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a indexable cutting tool used for cutting, and more particularly to a cutting tool with a wear sensor.

[0002]

2. Description of the Related Art At the time of cutting, tool wear such as abrasion and chipping (small chipping) of a cutting tool significantly deteriorates machining accuracy. Can be However, directly observing tool wear during machining is very difficult in the working environment.

[0003] Therefore, other phenomena accompanying the tool wear (such as changes in cutting force and vibration) are detected by a sensor installed near a processing point on a machine tool or the like, and the detected signal is subjected to some kind of signal processing. Estimate tool wear. for that reason,
In the in-process, it was difficult to obtain a quantitative amount of wear, or sufficient sensitivity and reliability were not obtained.

[0004] Therefore, the present inventor can detect the in-process wear during machining by arranging a sensor in a portion of the cutting tool itself where wear and chipping (destruction) of the cutting tool occur. The quantity is determined quantitatively,
In addition, a cutting tool with a sensor having excellent sensitivity and reliability has been invented and a patent application has been separately filed.

[0005] Such a cutting tool with a sensor can be applied only when the base material of the cutting tool is formed of a non-conductive material such as ceramic. That is, when the base material of the cutting tool is formed of a conductive material, a short circuit occurs between a plurality of fine wires constituting the sensor and the sensor does not function as a sensor. Is not applicable when is a conductive material.

[0006] Further, even when a cutting tool whose base material is coated with a non-conductive material or a non-conductive material is used, when a conductive work is cut, the minuteness of the work is reduced. When the workpiece short-circuits the fine wire of the sensor due to vibration, or when a cutting oil is used, the sensor is similarly short-circuited by the oil, and the electric resistance value detected from the sensor becomes unstable. .

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting tool with a sensor capable of quantitatively determining the amount of tool wear in-process during machining. The first problem is to enable the sensor to be applied even when the base material of the cutting tool is a conductive material, and the second problem is to provide an insulating structure for preventing a short circuit due to various causes during in-process. It is to provide.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and a base material of a cutting tool is formed of a conductive material, and has a wear detecting function sensor thin film on a flank. In an away type cutting tool, a cutting tool with a wear sensor is provided, wherein a non-conductive thin film is formed between a base material of the sensor thin film and a base material of the cutting tool with the sensor.

A non-conductive thin film is formed on the surface of the sensor thin film.

The present invention also provides a throw-away type cutting tool in which a base material of the cutting tool is formed of a non-conductive material and has a wear detecting function sensor thin film on a flank surface. And a cutting tool with a wear sensor.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
1 is a diagram showing an embodiment of the present invention. Hereinafter, the configuration of the cutting tool with a sensor having an insulating structure according to the present invention will be described in detail through the manufacturing process.

As shown in FIG. 1 (a), a base material 2 of a cutting tool 1 according to the present invention is formed of a conductive material such as cemented carbide or CBN, and its shape is a normal cutting tool. And a flank 4, a rake face 5 and a lateral flank 6 adjacent to each other via the cutting edge 3.

When manufacturing the cutting tool with sensor 1 of the present invention, as shown in FIG. 1B, the entire surface of the base material 2 is made of non-conductive material such as ceramics, for example, alumina. The conductive thin film 7 is formed by a thin film forming technique of vapor deposition and sputtering.

As shown in FIG. 1C, a sensor thin film 8 and a terminal thin film 9 are formed on the surface of the non-conductive thin film 7 thus formed by the same thin film forming technique as described above. This sensor thin film 8 is placed on the flank 4
It consists of a plurality of narrow wires 10 of equal width and equal spacing made of a conductive material such as pure titanium. For example, it is formed with a width of 100 μm and an interval.

The plurality of thin wires 10 of the sensor thin film 8 are juxtaposed so as to extend in a direction perpendicular to the direction f of flank wear generated and growing on the flank, and all the thin wires 10 are made of conductive material thin films at both ends. Are connected in parallel by the terminal sections 9 and 9.

Among the sensor thin film 8 and the terminal thin film 9 of the cutting tool 1, the electrode portion 11 of the terminal thin film 9 is provided.
As shown in FIG. 1D, the portion excluding the above is vapor-deposited with a non-conductive material such as ceramic as described above and covered with a non-conductive thin film 12. Thereby, the cutting tool 1 of the present invention is completed.

The above-described cutting tool with sensor 1 according to the present invention.
As can be understood from the manufacturing process of the present invention, the configuration of the cutting tool with sensor 1 of the present invention comprises a base material 2 of the cutting tool and a base material 2 of the cutting tool.
, A sensor thin film 8 and a terminal thin film 9 composed of a plurality of equal-width, equally-spaced thin wires 10 made of a conductive material formed on the upper surface thereof, and an electrode portion 11 of the terminal thin film 9. Except for the sensor thin film 8 and the non-conductive thin film 12 which covers the terminal thin film 9.

The operation of the embodiment of the cutting tool with sensor 1 of the present invention having such a configuration will be described below. In use, an ohmmeter (not shown) is connected in series to the electrode portion 11 of the terminal thin film 9 via an electric wire or a contact as appropriate.

When the cutting tool with sensor 1 is used for cutting for a long time, the portion of the flank 4 connected to the cutting edge 3 wears in the direction of the arrow f, and in some cases, the cutting edge 3
Or the so-called chipping in which the vertex P is missing.
These flank wear and chipping are one important criterion for determining the tool life.

With respect to the cutting tool with sensor 1 in which wear progresses or chipping occurs, a thin wire 1 is measured by an ohmmeter in an in-process during the cutting process.
The electrical resistance at both ends of 0 is measured. Then, the thin wire 10 is gradually thinned or broken with the progress of the flank wear and chipping, so that the electric resistance at both ends of the sensor thin film 8 changes. Thus, the wear state of the cutting tool with the sensor and the state of occurrence of chipping are detected.

Since the cutting tool with sensor 1 covers the surface of the base material 2 with the non-conductive thin film 7, even if the base material 2 is formed of a conductive material, the sensor thin film made of the conductive material can be used. 8 and terminal membrane 9 can be applied to the surface.

Further, in the cutting tool with sensor 1 according to the present invention, since the outer surface of the sensor thin film 8 is further covered with the non-conductive thin film 12, the workpiece is subjected to minute vibration of the sensor due to micro vibration of the workpiece during cutting. When the cutting oil is used, or when the cutting oil is used, the thin wire 10 is not short-circuited by the cutting oil, and the electric resistance value detected from the sensor thin film 8 becomes unstable.

Although a detailed description with reference to the drawings is omitted here, as a second embodiment according to the present invention, a base material of a cutting tool with a sensor is formed of a ceramic material or the like, and a sensor is provided on the surface thereof. With respect to those formed by forming a thin film and a terminal thin film, a configuration in which a non-conductive thin film is formed on these thin films except for the sensor electrode of the sensor thin film may be considered.

According to this embodiment, as in the first embodiment, the workpiece short-circuits the fine wire 10 of the sensor due to the minute vibration of the workpiece during the cutting, or the cutting is performed when the cutting oil is used. The problem that the thin wire 10 is not short-circuited by the oil agent and the electric resistance value detected from the sensor thin film 8 becomes unstable is eliminated.

Although one embodiment has been described above, it goes without saying that other embodiments are possible within the technical idea of the invention described in the claims of the present application.

[0027]

Since the present invention has the above-described structure and operation, a cutting tool with a conductive material is provided in a cutting tool with a sensor capable of quantitatively determining the amount of tool wear in process during machining. Can be applied to any material.

In addition, the instability of measured values caused by short-circuits due to various causes such as vibration and oil contact during in-process can be eliminated, so that the degree of wear of the flank surface of the cutting tool and the state of chipping during in-process can be reduced. In addition, accurate and quantitative measurement can be performed without being affected by various causes during cutting.

By using the cutting tool of the present invention,
By detecting the wear or chipping state of the cutting tool with extremely high accuracy and replacing the cutting tool, it is possible to prevent the cutting precision from being worn to an inappropriate degree for cutting or the deterioration of the cutting accuracy due to the continued use of the chipping tool. Can be.

In addition, it is possible to prevent uneconomical situations such as replacing or discarding a usable cutting tool which has not been worn or chipped to an unsuitable degree for cutting, and is extremely efficient and economical. Management in the cutting tool in-process is possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a cutting tool according to the present invention, and (a) to (d) show manufacturing steps thereof.

[Explanation of symbols]

 Reference Signs List 1 cutting tool with sensor 2 base material 3 cutting edge 4 flank 5 rake face 6 side flank 7 nonconductive thin film 8 sensor thin film 9 terminal 10 thin wire 11 terminal electrode 12 nonconductive thin film

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[Procedure amendment]

[Submission date] July 26, 1999 (1999.7.2)
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and a cutting tool base material is formed of a conductive material, and a cutting tool wear detecting function sensor thin film is formed on a flank. In the indexable cutting tool having a non-conductive thin film is formed on the entire surface of the base material,
Sensor thin film and terminal thin film on the surface of the non-conductive thin film
Are formed, and the sensor thin film has a plurality of
The plurality of fine lines are spaced apart from each other.
Direction perpendicular to the direction of flank wear that occurs and grows on the surface
All wires are conductive at both ends
Provided is a cutting tool with a wear sensor, which is connected in parallel by terminals of a thin film of material .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The above sensor thin film and terminal thin film
In the middle, a non-conductive thin film is formed on the surface excluding the electrode portion .

Claims (3)

[Claims] 1. A throw-away type cutting tool in which a base material of a cutting tool is formed of a conductive material and has a cutting tool wear detecting function sensor thin film on a flank surface, wherein a distance between the sensor thin film and the base material of the cutting tool with the sensor is provided. A cutting tool with a wear sensor, wherein a nonconductive thin film is formed on the cutting tool. 2. A cutting tool with a wear sensor, wherein a non-conductive thin film is formed on a surface of the sensor thin film. 3. A throw-away type cutting tool wherein a base material of the cutting tool is formed of a non-conductive material and a cutting tool wear detection function sensor thin film is provided on a flank, wherein a non-conductive thin film is formed on a surface of the sensor thin film. A cutting tool with a wear sensor, characterized in that the cutting tool is provided.