JP2002178240A - Measuring method and device of tool edge temperature in cutting cutting workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring method and device of a tool edge temperature simply and stably measuring the cutting temperature of the tool edge without affected by influences such as disturbance in cutting a non-conductive or a conductive cutting workpiece by the tool. SOLUTION: This measuring device of the tool edge temperature is so formed that a tool 1 is formed of tool half pieces 2A and 2B of two types of conductive materials having different thermoelectromotive force characteristics, a temperature measuring point 5 is formed by bringing the tip portion of the tool blade 26 in contact with the measuring device, regions except for the temperature measuring point 5 are mutually insulated by a first insulating member 3A, and the outer surface of the tool 1 adjoining to a tool holder 6 is insulated from the tool holder 6 by a second insulating member 3B. The tool half pieces 2A and 2B are connected to a pen recorder 8 via lead wires 7A and 7B. When the tool 1 cuts a cutting counter-material 4, the cutting temperature of the tool edge 26 is measured by the thermoelectromotive force generated between the tool half pieces 2A and 2B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the field of cutting tools,
It can be applied to the field of machining, their research, measurement equipment, etc., and can measure the temperature of the tool tip when cutting non-conductive or conductive work materials. A method and an apparatus therefor.

[0002]

2. Description of the Related Art A cutting tool or a tool used for cutting a workpiece, ie, a work material, has a great influence on a machining cost, a machining accuracy, a property of a finished surface, etc. of the work material. Reducing the adverse effects is an important concern at the machining site in order to extend the tool life. On the other hand, among the factors affecting tool wear, depending on the processing conditions, the tool edge temperature (cutting temperature) may be 1000.
In some cases, the temperature of the tool edge can be as high as ℃ or more, and the increase in the temperature of the tool edge is one of the important factors influencing the wear of the tool edge.

[0003] As a method of measuring the temperature of the tool edge, that is, the cutting temperature, conventionally, a method of discriminating the chip color of the work material, a method using a thermo color of the tool edge or the work material, a method using a radiation thermometer, and the like. , A method using an infrared photograph, a method of inserting a thermocouple into a tool or a work material, and the like are known. These methods for measuring the temperature of the tool edge are inferior in terms of simplicity and reliability as compared with the tool-workpiece thermocouple method described below.

Recently, as a method of measuring a cutting temperature, a method of measuring a temperature distribution of a tool rake face using a thermal imaging apparatus, an optical fiber is inserted into a work material, and a tool flank temperature is measured using an optical coupler and an infrared element. A way to do that has been proposed.
These methods of measuring the cutting temperature are effective means for measuring the respective temperatures, but have problems such as the large size of the apparatus, high cost, and long time for data processing.

As a simpler and more reliable method for measuring the temperature of the tool edge than the above-mentioned respective temperature measuring methods, there is a thermocouple method between a tool and a work material which is generally used. FIG. 8 shows an apparatus for measuring the temperature of the tool edge in a general lathe. In the tool-workpiece thermocouple method, a thermocouple is formed between the tool 11 and the workpiece, that is, the workpiece 14, and the tool 11
The tool edge temperature, in other words, the cutting temperature, is measured using the thermoelectromotive force generated between the workpiece and the work material 14.

In a general lathe, the tool 11 is held by a tool holder 16. Here, the work material 14 having a hollow hole is used. Spindle 1
Numeral 3 is rotatably supported by the headstock 25.
3 is inserted through the mandrel 20 held by the chuck 22 of No. 3 and the mandrel 20 is inserted into the mandrel 20.
4 is fixed. A tailstock 21 is pressed against the tip of the mandrel 20, and the mandrel 20 is pressed.
Are rotatably supported by the tailstock 21.

As shown in FIG. 8, a tool edge temperature measuring device for achieving the tool-workpiece thermocouple method includes a tool 11 insulated from a tool holder 16 by an insulating member 12, a headstock 25 on a headstock 25, and a bearing 24. The main shaft 13 is rotatably supported via a shaft, the mandrel 20 held by a chuck 22 provided on the main shaft 13, a conductive work material 14 having a hollow hole fixed to the mandrel 20, and a work material 14. A rotary contact (mercury contact) 15 provided on a headstock 25 for extracting a signal from a rotating part, a pen recorder 18 constituting a recorder, and a variable resistor 23 for removing an error component due to a temperature rise at a tool end. A lead wire 17A connected through a compensation circuit 19 and a rotary contact 15 attached to the work material 14.
Lead wire 17 connecting between the pen and pen recorder 18
B. The tool edge temperature measuring device detects a current flowing through the lead wire 17A and the lead wire 17B with the pen recorder 18 according to the temperature of the tool 11 and the workpiece 14 to obtain a thermoelectromotive force. The temperature is converted from the thermoelectromotive force characteristics (the relationship between the temperature and the thermoelectromotive force) obtained by performing the test with the combination of the materials 14, and the cutting temperature of the tool 11 is measured.

[0008] The tool-workpiece thermocouple method as described above,
For example, it is disclosed in JP-A-2000-202704. The tip holding device for measuring a thermoelectromotive force between a tool and a work material disclosed in the publication can easily and firmly attach a conductor to a tip, and the conductor does not come off even if chips are entangled during cutting. It is composed of a chip attached to the chip holder, a lead wire, a fixed arm, a bolt attaching the fixed arm to the chip holder, a holding bolt attached to the fixed arm, and a holding plate fixed to the tip of the holding bolt. . The tip holding device for measuring the thermoelectromotive force between the tool and the work material consists of a holding plate consisting of an insulating plate, a conductor inserted between the holding plate and the tip, and the conductor fixed to the tip with holding bolts. is there.

[0009]

In the conventional tool-workpiece thermocouple method which has been widely used, both the tool material and the work material constituting the thermocouple are conductive materials. There is a need. Therefore, when the material of the work material is not a conductive material, there is a problem that the tool-work material thermocouple method cannot be used. Therefore, the measurement of the cutting temperature of a non-conductive material has no choice but to be measured by other measuring methods, and there are few examples of the measurement. Therefore, the cutting temperature can be measured even when the workpiece, that is, the work material is a non-conductive material, and the cutting temperature by the tool-work material thermocouple method, generally a temperature close to the average temperature on the rake face of the tool. However, there is a problem how to configure the measurement in a simple manner.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems. A tool is composed of a pair of tool halves, and the tool halves use two types of tool materials having different thermoelectromotive forces. The two types of tool halves are brought into contact with each other at the tool edge, and the contact surface is used as a high-temperature contact or a measuring point to form a thermocouple. A method and apparatus for measuring the temperature of a tool edge at the time of cutting a work material capable of measuring the average temperature of the contact surface, that is, the average temperature of the contact surface between the tool halves when cutting a material. It is to provide.

According to the present invention, at least a non-conductive material, that is, a non-conductive or conductive work material is formed by a tool having a temperature measuring point formed by connecting the respective cutting edges of a pair of tool halves made of different materials. Measuring the temperature of the tool edge by the thermoelectromotive force generated between the tool halves, which is measured through the lead wires connected to the tool halves, respectively. The present invention relates to a method for measuring a tool edge temperature during cutting.

The present invention also provides at least a non-conductive material.
That is, a pair of tool halves made of materials having mutually different thermoelectromotive characteristics forming a tool for cutting a non-conductive or conductive work material are formed by fixing the cutting edges of the tool halves in contact with each other. A first insulating member interposed between the tool halves except for the temperature measuring point and the cutting edge of the tool halves to insulate the tool halves from each other, and a second insulating member to insulate the tool halves from the tool holder holding the tool, respectively. A tool cutting edge temperature at the time of cutting a work material comprising an insulating member, each lead wire connected to and pulled out from the tool half, and a pen recorder for measuring a thermoelectromotive force generated between the tool halves through the lead wire. Related to a measuring device.

In this device for measuring the temperature of a tool edge, one of the tool halves is made of a carbide K10 grade and the other tool half is made of a carbide P10 grade. Alternatively, one of the tool halves is made of K10 carbide, and the other tool half is made of cermet.

The work material is a workpiece made of a conductive or non-conductive material that can be cut by the tool halves constituting the tool. Further, the first insulating member and the second insulating member are insulating plates each made of alumina ceramics.

The contact area between the tool halves constituting the temperature measuring point is about 0.125 mm ² . Further, the contact surfaces of the tool halves constituting the temperature measuring point are formed in a triangular shape.

Since the method and the apparatus for measuring the temperature of the cutting edge of the tool when cutting the work material are configured as described above, a method using a so-called thermocouple formed between the tools, ie, a method using a thermocouple, is used. It provides a tool-to-tool thermocouple method that can measure the cutting temperature close to the average tool rake face temperature measured by the conventional tool-workpiece thermocouple method,
The average temperature of the contact surface between the tool halves can be measured as the cutting temperature.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for measuring the temperature of a tool edge at the time of cutting a workpiece according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view showing an embodiment of a device for measuring the temperature of a tool edge at the time of cutting a work material according to the present invention, FIG. 2 is an enlarged explanatory view of a main part of the device for measuring the temperature of a tool edge shown in FIG. FIG. 3 is an explanatory view showing a cutting state near a tool edge, and FIG. 4 is a cutting temperature, a cutting speed, and a cutting temperature of a thermocouple method between a tool half and a tool half of the present invention and a conventional thermocouple method between a tool and a workpiece. FIG. 5 is a graph showing the relationship between the contact area at the temperature measuring point of the tool half and the cutting temperature measured by the thermocouple method between the tool halves of the present invention, and FIG. FIG. 7 is a graph showing the relationship between the cutting temperature and the cutting speed when cutting a work material, and FIG. 7 shows a tool half-tool half-piece thermocouple method according to the present invention and a conventional tool-work material thermocouple method. 7 is a graph showing a thermoelectromotive force waveform corresponding to a cutting time when each of the measurements is taken.

The method of measuring the temperature of the tool edge when cutting the work material is as follows: non-conductive materials such as wood, resin, and ceramics;
Alternatively, a tool edge generated when a workpiece 1 made of a composite material of a non-conductive material and a conductive material and entirely made of a non-conductive material, that is, a workpiece 1 is cut by the tool 1 It is preferably applied to measure the temperature, in other words, the cutting temperature.

This method of measuring the temperature of the tool edge is performed when a non-conductive workpiece, ie, a work material 4 is cut by a tool 1 having a pair of tool halves 2A and 2B made of different materials arranged in parallel with each other. The generated temperature of the tool edge 26 is
The lead wires 7A connected to the tool halves 2A and 2B, respectively.
The temperature of the tool edge 26 is measured by the thermoelectromotive force generated between the tool halves 2A and 2B measured through 7B. That is, a part of each cutting edge of the tool halves 2A and 2B is connected to each other to form a hot contact, that is, a temperature measuring contact (hereinafter, referred to as a temperature measuring point 5). In the method of measuring the temperature of the tool edge, when the work material 4 is a non-conductive material, the conventional tool-work material thermocouple method cannot be used, so that the tool 1 is used instead of the conductive work material. Is divided into two to produce tool halves 2A and 2B,
A part of the side surface of the cutting edge of the tool half 2A and the tool half 2B is joined to form a temperature measuring point 5, which is generated between the tool halves 2A and 2B through the lead wires 7A and 7B connected to the tool halves 2A and 2B, respectively. The measured thermoelectromotive force is used to measure the temperature of the tool edge, which can be said to be a kind of tool-tool thermocouple method.

Next, a description will be given of an apparatus for measuring a tool edge temperature for achieving the method for measuring a tool edge temperature at the time of cutting a work material according to the present invention. This device for measuring the temperature of the tool edge will be described as applied to a general lathe of a machine tool, but it is needless to say that the device can be applied to other machine tools. In the lathe, the tool 1 is held by a tool holder 6. Here, the work material 4 in which a hollow hole is formed is used. The spindle 13 is rotatably supported by a headstock (not shown), and a mandrel 20 held by a chuck 22 of the spindle 13 is inserted with a hollow hole of the work material 4 to cut the mandrel 20. The material 4 is fixed. A tailstock 21 is pressed against the tip of the mandrel 20, and the mandrel 20 is rotatably supported by the tailstock 21.

In this device for measuring the temperature of the tool edge, the tool 1
Are held in an insulated state by a tool holder 6 with an insulating member 3B interposed therebetween, and are composed of a pair of tool halves 2A and 2B made of different types, that is, two types of conductive materials. The tool halves 2A and 2B are formed of materials having mutually different thermoelectromotive characteristics. Tool half 2A,
The temperature measuring points 5 are formed by fixing the cutting edges of 2B in contact with each other. The tool halves 2A, 2B are, except for their cutting edges, between the tool halves 2A, 2B.
An insulating member 3A (first insulating member) that insulates them from each other is interposed. The tool halves 2A and 2B are surrounded by an insulating member 3B (second insulating member) so as to be insulated from the tool holder 6 holding the tool 1, respectively. The lead wires 7A and 7B are connected to the tool halves 2A and 2B, respectively, and are drawn out from the tool halves 2A and 2B. The lead wires 7A and 7B connect the tool halves 2A and 2B and the pen recorder 8 of the recorder, respectively. The pen recorder 8 measures the thermoelectromotive force generated between the tool halves 2A and 2B. Then, the temperature is converted from the thermoelectromotive force data between the tool halves 2A and 2B separately obtained, and the temperature of the tool edge 26 is measured.

One of the tool halves 2A is made of a carbide type K10, and the other tool half 2B is made of a carbide type P10. Alternatively, one tool half 2A is made of carbide K10
The other tool half 2B is made of a cermet. P10 or K10 is a classification code used as a chip for a byte. For example, P10 is
Rockwell hardness is 91 or more and bending strength is 90kg
f / mm ² or more, and K10 has a Rockwell hardness of 90.5 or more and a transverse rupture force of 120 kgf / m 2.
m ² or more. Of course, the tool halves 2A and 2B may be made of materials having different thermoelectromotive characteristics from each other. For example, besides the carbide tip material of P10 or K10, for example, P01, P20, P30, P40, P50 , Or M10, M20, M30, M40, or K01, K2
The carbide chips 0, K30, and K40 can be appropriately selected and combined, and the temperature corresponding to the thermoelectromotive force value generated at that time can be measured in advance using a map or the like.

The insulating members 3A and 3B may be made of the same heat-resistant material, for example, an insulating plate made of heat-resistant alumina ceramics. That is, as shown in FIG. 3, the tool halves 2A and 2B
An insulating member made of an alumina ceramic plate is used to form a contact portion between tools, that is, a temperature measuring point 5 by bringing the triangular contact portions of the tool cutting edges into contact with each other and to insulate the other tool halves 2A and 2B. 3A to tool halves 2A, 2B
The tool 1 is molded by pasting or filling in between. As shown in FIG. 2, the outer peripheral surface of the tool 1 in contact with the tool holder 6 is surrounded by an insulating member 3B made of an alumina ceramic plate.
The tool 1 was completely insulated from the tool holder 6. In this embodiment, the cold junction of the thermocouple formed between the tool halves, that is, between the tool and the tool, is at room temperature.

The contact surfaces of the tool halves 2A and 2B constituting the temperature measuring point 5 can be formed in various ways. For example, as shown in FIG. 3, they can be formed in contact with each other in a triangular shape. Although the thermoelectromotive force generated between the tool halves 2A and 2B varies depending on the contact area value of the contact surface, for example, about 0.125 mm ² is preferable.

This device for measuring the temperature of the cutting edge of the tool is constructed as described above, and measures the thermoelectromotive force generated between the tool halves 2A and 2B when the work material 4 is cut by the recorder 8 for cutting. Calculate and record the temperature. It goes without saying that the present invention can be used not only for the tool edge temperature measuring device and the lathe tool edge temperature but also for other two-dimensional cutting modes.

FIG. 3 shows that a processing machine equipped with this tool edge temperature measuring device is used in a tool at the beginning of cutting, that is, at the time of cutting when wear is not large, particularly when flank wear is hardly generated. The cutting state near the cutting edge 26 is shown. The tool cutting edge line 9 is a portion where the cutting edge 26 of the tool 1 composed of the tool halves 2A and 2B comes into contact with the work material 4, and the tool 1 cuts the work material 4. Tool-chip contact area 10
Is a region where the chips, which are generated by cutting the work material 4, and the tool 1 are in contact with the tool 1, and is a contact portion between the tools, that is, a heat source at the temperature measuring point 5. In the conventional method of measuring a cutting temperature, the tool-workpiece thermocouple method, the average temperature of the entire contact area between the tool and the chip or the tool and the workpiece is measured. In the tool-to-tool thermocouple method, the average temperature of the temperature distribution formed at the temperature measuring point 5 at the contact portion between the tools is measured.

The graph shown in FIG. 4 is obtained when the temperature is measured by the tool-tool thermocouple method, which is a method of measuring the tool edge temperature according to the present invention, and by the conventional tool-workpiece thermocouple method. The relationship between the cutting temperature and the cutting speed is shown. In FIG. 4, the vertical axis shows the cutting temperature (° C.), and the horizontal axis shows the cutting speed (m
/ Min). At this time, the work material 4 was an aluminum alloy (A2017T6) which was a conductive material. In the tool-to-tool thermocouple method of the present invention, the contact area of the tool-to-tool contact portion 10 is 2 mm ² (△ and solid line), 0.5
mm ² (△ mark and chain line) were measured for 0.125 mm ² (△ mark and dotted line). In addition, as a tool material formed of the tool halves 2A and 2, two kinds of carbide K10 and cermet were used. In the conventional tool-workpiece thermocouple method, as a tool material constituting the tool 11, a carbide K10 type (〇 and solid line) or a cermet (（and solid line) was used. The feed of the tool 1 was 0.01 mm / rev, the cutting width of the work material 4 was 3 mm, the rake angle of the tool 1 was −5 °, and the cutting form was dry cutting.

Measured by the conventional tool-work material thermocouple method
In this case, the difference in thermal conductivity of the used tool 11
Cutting temperature is higher for carbide type K10 than when using
Becomes lower. To the temperature measured by the tool-workpiece thermocouple method
On the other hand, in the tool-tool thermocouple method of the present invention, the tool 1
To measure the average temperature in the internal contact area,
Temperatures lower than the inter-material thermocouple method were measured. But the tool
Reduce the contact area between the half piece 2A and the tool half 2B
As the measurement temperature increases, the contact surface increases as shown in FIG.
Product is 0.125mm^TwoAt the time of tool-work material thermocouple method
Value close to the cutting temperature measured with K10 carbide
Was. From this, the tool-to-tool thermocouple method of the present invention
Is the contact area between the tool half 2A and the tool half 2B.
0.125mm ^TwoThat it is preferable that
You.

The graph shown in FIG. 5 shows the relationship between the contact area between the tools, that is, the contact area between the tool halves 2A and 2B at the temperature measuring point 5 and the cutting temperature. In FIG. 5, the vertical axis indicates the cutting temperature (° C.), and the horizontal axis indicates the contact area (mm ² ). Cutting speed 300m / min, 200m / min,
The cutting temperature (° C.) at the tool edge 26 at 100 m / min and 50 m / min was measured, respectively.
For the tool material constituting the tool halves 2A and 2B, carbide K1
What was produced by 0 kind and cermet, respectively was used. As the work material 4, an aluminum alloy (A2017T6) as a conductive material was used. The feed of the work material 4 is 0.
01 mm / rev, and the cutting width of the work material 4 is 3 mm.
mm. As shown in the graph of FIG. 5, as the contact area between the tool halves 2A and 2B at the temperature measuring point 5 is reduced,
It can be seen that the measured temperature of the cutting temperature is higher. Tool halves 2A and 2B in the tool-tool thermocouple method of the present invention
With a contact area of 0.125 mm ² of the contact surface of No. ¹ , a value close to the cutting temperature measured with the carbide K10 type of the conventional tool-workpiece thermocouple method was measured. Therefore, in the tool-tool thermocouple method, similarly to the tool-workpiece thermocouple method, it is considered that the temperature of the tool cutting edge 26 is sufficiently reliable. Also,
Even if the contact area of the contact surfaces of the tool halves 2A and 2B is reduced, the measured temperature does not change much, and it is understood that the contact area of about 0.125 mm ² is sufficient in consideration of the strength of the tool edge. .

The graph shown in FIG. 6 shows the relationship between the cutting temperature and the cutting speed when cutting various nonconductive materials. In FIG. 6, the vertical axis indicates the cutting temperature (° C.), and the horizontal axis indicates the cutting speed (m / min). As the work material 4, wood cedar (a), wood lauwan (b), resin acryl (c) and ceramics (d) were used. Each cutting temperature indicates a temperature difference from the room temperature, which is the cold junction. Carbide K10 is used for the tool material of the tool halves 2A and 2B.
Seeds and cermets were used. The contact area of the contact surface with the tool halves 2A and 2B at the temperature measuring point 5 is 0.125 mm.
^The one configured in ² was used. The feed of tool 1 is 0.01 mm / rev, and the rake angle of tool 1 is -5.
°. The cutting width of the work material 4 is 3 m for the cedar of (a).
m, (b) Rawan 7mm, (c) Acrylic 5m
The ceramics of m and (d) are 3 mm. Also,
The cutting mode is dry cutting. In the graph of (a), as a comparative example, the work material 4 is made of an aluminum alloy (A2017).
The relationship between the cutting temperature and the cutting speed when using T6) is shown. As shown in the graph of FIG. 6, it can be seen that the cutting temperature at the tool cutting portion, that is, the temperature measuring point 5 can be measured with each non-conductive material. Further, it can be seen that the cutting temperature is considerably low in ceramics in which chips are generated by brittle fracture depending on the cutting state, that is, the chip generation state.

The graph shown in FIG. 7 shows the thermoelectromotive force waveforms recorded during cutting when measured by the conventional tool-workpiece thermocouple method and by the tool-tool thermocouple method of the present invention, respectively. Represents. In FIG. 7, the vertical axis represents the thermoelectromotive force (EMF.
mV), and the horizontal axis shows the cutting distance (mm).
In the conventional tool-workpiece thermocouple method, the carbide K10 is used as the tool material of the tool 11, and the tool of the present invention is used.
In the tool-to-tool thermocouple method, carbide K10 and cermet were used as tool materials for the tool halves 2A and 2B. Work material 4,
14 is an aluminum alloy (A20) which is a conductive material.
17T6) was used. Tools 1 for work materials 4 and 14
The cutting speed of No. 11 was 100 m / min,
1 is 0.02 mm / rev, and the work material
The cutting width of No. 4 is 3 mm, and the cutting form is dry cutting. The value of the thermoelectromotive force differs depending on the material used to combine the thermocouples. Therefore, the thermoelectromotive force during the cutting by the tool-workpiece thermocouple method and the thermoelectric force during the cutting by the tool thermocouple method are different as shown in FIG. In the conventional tool-workpiece thermocouple method, the fluctuation of the thermoelectromotive force waveform measured during the cutting is large even in a relatively stable cutting state, and the tool-tool thermocouple method of the present invention is used. Shows that there is almost no fluctuation and it is stable. This phenomenon is considered to be due to the fact that in the conventional tool-workpiece thermocouple method, the contact state between the tool 11 and the chip during cutting, that is, the contact resistance fluctuates, and the contact portion between the tool 11 and the chip is measured by a measuring circuit. It is presumed that it is included in the above and that the fluctuation appears directly as the fluctuation of the measured value. In view of the above, it can be seen that the tool-tool thermocouple method of the present invention can obtain stable measurement values as compared with the conventional tool-workpiece thermocouple method.

[0032]

The method and apparatus for measuring the temperature of the cutting edge of a tool when cutting a work material according to the present invention are constructed as described above, so that the workpiece, that is, the work material is nonconductive or conductive. Even for a workpiece made of a material, it is possible to measure the cutting temperature of the tool edge when cutting the workpiece. In particular, as described above, the present invention can measure not only the cutting temperature of a non-conductive material but also the cutting temperature of a conductive material. Further, since the temperature at the temperature measuring point at the contact portion between the tools is measured, there is no disturbance such as chips or the like, the fluctuation of the thermoelectromotive force is small, and the cutting temperature can be stably measured. Furthermore,
Since this device for measuring the temperature of the tool edge is composed of a thermocouple formed between the tools, it has a simple structure.
It is easy to manufacture and install, and the measurement temperature is
A stable thermoelectromotive force waveform can be obtained as compared with the inter-workpiece thermocouple method. The method for measuring the cutting temperature according to the present invention is based on the conventional tool-work material if the contact area of the temperature measuring point between the tool halves is made as small as possible in consideration of the strength of the tool halves. The cutting temperature can be measured very close to the cutting temperature obtained by the thermocouple method, and it is highly reliable as a method for measuring the cutting temperature.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of a device for measuring the temperature of a tool edge when cutting a work material according to the present invention.

FIG. 2 is an enlarged explanatory view of a main part of the device for measuring a tool edge temperature shown in FIG. 1;

FIG. 3 is an explanatory diagram showing a cutting state near a tool edge;

FIG. 4 is a graph showing the relationship between the cutting temperature and the cutting speed between the tool half-tool half-piece thermocouple method of the present invention and the conventional tool-workpiece thermocouple method.

FIG. 5 is a graph showing a relationship between a contact area of a temperature measuring point of a tool half and a cutting temperature measured by a thermocouple method between a tool half and a tool half of the present invention.

FIG. 6 is a graph showing a relationship between a cutting temperature and a cutting speed when various non-conductive work materials are cut.

FIG. 7 is a graph showing a thermoelectromotive force waveform corresponding to a cutting time when each is measured by a tool half-tool half-tool thermocouple method of the present invention and a conventional tool-workpiece thermocouple method. .

FIG. 8 is a graph showing a thermoelectromotive force waveform corresponding to a cutting time when each is measured by the tool half-tool half-piece thermocouple method according to the present invention and the conventional tool-workpiece thermocouple method. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool 2A, 2B Tool half piece 3A 1st insulating member 3B 2nd insulating member 4 Work material 5 Temperature measuring point (contact part between tools) 6 Tool holder 7A, 7B Lead wire 8 Pen recorder 26 Tool edge

Claims (8)

[Claims] 1. A tool in which the cutting edges of a pair of tool halves made of different materials are joined to form a temperature measuring point,
The temperature of the tool edge, which is generated at least when cutting a non-conductive work material, is determined by the thermoelectromotive force generated between the tool halves measured through the lead wires connected to the tool halves, respectively. A method for measuring the temperature of a tool edge when cutting a work material, comprising measuring. 2. A pair of tool halves made of materials having different thermo-electromotive force characteristics forming a tool for cutting at least a non-conductive work material, and formed by fixing the cutting edges of said tool halves in contact with each other. A first insulating member interposed between the tool halves except for the temperature measuring point and the cutting edge of the tool halves to insulate the tool halves from each other and a second insulating member to insulate the tool halves from the tool holder holding the tool; (2) a pen recorder for measuring the temperature of the tool edge by measuring the thermoelectromotive force generated between the tool halves through the lead wires, the lead wires being connected to and pulled out from the tool halves, respectively; Measuring device for tool tip temperature when cutting work material. 3. The cutting tool according to claim 2, wherein one of the tool halves is made of a carbide type K10 and the other tool half is made of a carbide type P10. Measuring device for tool edge temperature. 4. The tool edge temperature during cutting of a work material according to claim 2, wherein one of said tool halves is made of a carbide type K10 and the other of said tool halves is made of a cermet. Measuring device. 5. The workpiece according to claim 2, wherein the workpiece is a workpiece made of a conductive or non-conductive material that can be machined by the tool half constituting the tool. An apparatus for measuring the temperature of a tool edge when cutting a work material according to claim 4. 6. The apparatus according to claim 2, wherein said first insulating member and said second insulating member are insulating plates made of alumina ceramic, respectively. Measuring device for tool tip temperature when cutting work material. 7. A contact area between the tool halves constituting the temperature measuring point is about 0.125 mm ² , wherein the tool half has a contact area of about 0.125 mm ^2. 2. A device for measuring the temperature of a tool edge at the time of cutting a work material according to claim 1. 8. A contact surface of the tool halves constituting the temperature measuring point is formed in a triangular shape. Or the measuring device of the tool edge temperature at the time of cutting of a work material according to claim 7.