JP2002066810A - Slotting throwaway tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slotting throwaway tip equipped with a wear sensor ensuring an electrical connection between a sensor line and an external circuit without hindering cutting operation. SOLUTION: The slotting throwaway tip 1 has front cutting edges 5 formed at the ridges of a cutting face 2 and a front flank 3 and has transverse cutting edges 6 formed at the ridges of the cutting face 2 and a transverse flank 4. A conductive sensor line 12 extending along the front cutting edge 5 and the transverse cutting edge 6 is provided to extend from the front flank 3 to the transverse flank 4 while being electrically insulated from a tip body. A pair of contact areas electrically connectable with a predetermined circuit is provided on the upper face and/or the bottom face of the tip body while being electrically insulated from the tip body, and two connecting lines 15 and 16 for connecting the two contact areas respectively with one end and the other end of the sensor line are provided on the surface of the tip body while being electrically insulated from the tip body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away insert used for grooving, and more particularly, to a grooving insert having a sensor line for detecting wear of a cutting blade.

[0002]

2. Description of the Related Art A throw-away tip mounted on a holder or the like and functioning as a cutting blade is known. A throw-away tip is a disposable tip that is replaced without re-polishing when the cutting edge is worn. In general, the indexable insert has a cutting edge formed at each corner of a substantially flat base material based on a square or a triangle. When the cutting edge of one of the corners is worn, the cutting edge of the other corner is used. It is replaced when the cutting edges at all corners are worn.

[0003] It is not easy to find out how much the cutting edge of the indexable insert has worn. In particular, it is very difficult in the working environment to detect the wear amount of the cutting edge without interrupting the cutting process during the cutting process.

Conventional methods for detecting the amount of wear on the cutting edge include:
(1) The cutting process is interrupted, the throw-away tip is removed from the holder or the like, and the cutting edge is observed with a tool microscope or the like. (2) A phenomenon accompanying the abrasion of the cutting edge, such as the cutting force. There has been a method of detecting a decrease, an increase in vibration, generation of abnormal noise, and the like by a sensor installed near a processing portion on a machine tool, and estimating a wear amount of a cutting edge based on a detection signal.

[0005] However, the method (1) has a problem that cutting must be interrupted and performed, and the amount of wear on the cutting edge cannot be quantitatively detected, resulting in poor accuracy.

In addition, the method (2) requires a complicated detection device, and has a problem that the detection sensitivity of the wear amount is poor and the reliability is low.

A proposal for solving these problems is disclosed in Japanese Utility Model Application Laid-open No.
No. 120323. In this publication,
It is disclosed that a sensor line is formed of a conductive film on a flank of a throw-away tip along a cutting edge. It is also disclosed that the width of the sensor line corresponds to the allowable wear width. Therefore, according to the throw-away tip disclosed in this publication, the sensor line is worn with the wear of the cutting edge, and it is possible to determine that the life of the cutting edge has reached when the sensor line is interrupted.

Japanese Patent Application Laid-Open No. 9-38846 discloses that
For ordinary cutting tools that are not throw-away inserts, a thin-film circuit is provided on the flank of the cutting tool, and when the electrical resistance changes as the thin-film circuit wears due to wear of the flank, the life of the cutting tool is detected. Has been proposed.

[0009]

A method of forming a sensor line of a conductive film along a cutting edge of a flank and detecting a change in resistance value of the line detects the wear of the cutting edge. Preferred as a method.

However, when this method is applied to a throw-away tip, it is practically difficult to connect the sensor line to an external detection circuit or the like even if a sensor line is provided along the cutting edge. Encounter the task of.

More specifically, the throw-away tip is a disposable tip as described above, and its size is less than 1 cm ³ . The chip performs cutting while being exposed to a cutting fluid (water or oil) and chips. Under such an environment, a technique of connecting a sensor line formed on a small grooving throw-away chip to an external detection circuit or the like without hindrance has been realized.

[0012] In the case of a groove-away insert, the entire groove width of the cutting edge is transferred to the work material. Therefore, when cutting is performed, wear proceeds at the corners of the insert. The groove width is reduced, and in some cases, the tolerance of the groove width is deviated. Therefore, it is necessary to periodically manage the groove width with a gauge, which complicates the operation.

Further, in the groove machining, the entire periphery of the front cutting edge of the cutting edge hits the work material, and micro chipping is apt to occur due to biting of chips, but if micro chipping occurs in the front cutting edge, the surface roughness of the groove bottom surface is reduced. There was a problem that it became rough.

An object of the present invention is to solve such a problem and to provide a grooving indexable insert with a wear sensor capable of performing practical mounting.

The main object of the present invention is to provide a reliable connection between a sensor line formed on a grooving throw-away tip and an external circuit when mounted on a holder or the like, and a connection without hindrance to cutting. It is an object of the present invention to provide a grooving indexable insert with a wear sensor capable of achieving the following.

Another object of the present application is to provide a grooving throw-away chip capable of protecting a connection portion between a sensor line provided in the throw-away chip and an external circuit.

[0017]

In order to achieve the above object, according to the first aspect of the present invention, a rake face is formed on at least one end of the chip body, a front flank is formed on the end face, and a side face is formed. A grooving throw-away insert in which a lateral flank is formed, a front cutting edge is formed at the ridge between the rake face and the front flank, and a horizontal cutting edge is formed at the ridge between the rake face and the lateral flank. And from the front flank to the side flank,
A conductive sensor line extending along the front cutting edge and the horizontal cutting edge is provided in an electrically insulated state with respect to the chip body, and a predetermined circuit is provided on an upper surface side and / or a bottom surface side of the chip body. A pair of contact regions electrically connectable to the chip body are provided in an electrically insulated state with respect to the chip body, and connect the two contact regions to one end and the other end of the sensor line, respectively. The present invention is characterized in that the connection lines are provided on the surface of the chip body in an electrically insulated state with respect to the chip body.

According to the second aspect of the present invention, one set of a pair of a rake face and a flank formed adjacently in the circumferential direction is provided on the outer peripheral surface of the chip body having a substantially plate shape as a whole. A plurality of sets are formed along the direction, and in the grooving indexable insert in which the cutting edge in the thickness direction is formed at the intersection of the rake face and the flank forming the pair, the flank has the cutting edge. A conductive sensor line extending along the chip body is provided in an electrically insulated state with respect to the chip body,
On the upper surface side and / or the peripheral surface side of the chip body, two pairs of contact regions electrically connectable to a predetermined circuit are provided in an electrically insulated state with respect to the chip body, Two connection lines for respectively connecting the two contact areas and one end and the other end of the sensor line are provided on the surface of the chip body in an electrically insulated state with respect to the chip body. I do.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1A and 1B are diagrams showing a grooved insert for grooving according to claim 1, wherein FIG. 1A is a diagram showing a state in plan view, FIG. 1B is a diagram showing a side view,
(C) is a diagram viewed from the bottom surface, and (d) is a diagram viewed from the end surface side.

The chip body 1 has a substantially prismatic shape as a whole, and a rake face 2 is formed above one end. Further, a front flank 3 is formed on the end face side of one end, and a lateral flank 4 is formed on the side end face side, and the rake face 2 and the front flank 3 are formed.
The front cutting edge 5 is formed on the ridge portion of the rake face, and the horizontal cutting edge 6 is formed on the ridge portion of the rake face and the lateral flank. A front cutting edge 5 and a horizontal cutting edge 6 are also formed on the other end side of the tip body 1.

In this grooving indexable insert,
The chip body 1 is attached to the holder via a clamp member.

The grooving indexable insert is formed so as to be substantially symmetrical in plan view and side view, and when rotated 180 ° in plan view, the other cutting edge on the other end side 5, 6 can be used for cutting. At both ends, sensor lines 12 of a conductive film extending along the front cutting edge 5 and the horizontal cutting edge 6 are provided.

The sensor line 12 is made of a conductive film having a predetermined width defined by an upper side and a lower side, and is provided on the flank surfaces 3 and 4. Specifically, it is formed on the front flank 3 and the lateral flank 4 so as to extend along the front cutting edge 5 and the horizontal cutting edge 6.

The upper side of the sensor line 12 is in contact with the front cutting edge 5 and the horizontal cutting edge 6, and is a line of a conductive film having a width W extending along the cutting edges 5, 6. Sensor line 12
Are provided in an electrically insulated state with respect to the chip body 1.

The width W of the sensor line 12 is equal to the life reference amount of the cutting blades 5 and 6 (the wear limit of the flank surfaces 3 and 4). Usually, the life reference amount of this type of throw-away tip 1 is in the range of 0.05 to 0.7 mm, so that the width W of the sensor line 12 is set to a value equal to the life reference amount.

For example, when the wear of the flank surfaces 3 and 4 of the throw-away tip 1 is 0.2 mm and the life is extended, the width W of the sensor line 12 is also set to 0.2 mm. When cutting is performed by the cutting edges 5 and 6, the wear of the cutting edges 5 and 6 and the flank surfaces 3 and 4 progresses as the processing time increases. As the wear of the flank surfaces 3 and 4 progresses, the sensor line 12 also wears accordingly. When the wear width of the flank surfaces 3 and 4 exceeds the life reference amount, the sensor line 12 having the width W corresponding to the life reference amount is disconnected due to wear. Since the resistance values at both ends of the sensor line 12 are measured by an external circuit as described later, when the resistance value of the sensor line 12 becomes infinite, the cutting edges of the cutting edges 5 and 6 reach the end of their life. It can be determined that it has been reached.

As shown in FIG. 1A, a contact region 13 is provided at a substantially central portion on the upper surface side, and another contact region 14 is provided at a substantially central portion on the back surface side. Two contact areas 1
Reference numerals 3 and 14 are formed of a conductive film, and are provided in an insulated state with respect to the main body 1. Contact areas 13, 14
Is an area that can be electrically connected to, for example, a resistance detection circuit provided outside the holder. As will be described later, when the throw-away tip 1 is mounted on the holder, a probe of a detection circuit provided on the holder is electrically connected to the contact regions 13 and 14. Contact area 13, 1
It is preferable that the area 4 is as large as possible so that a probe or the like of the detection circuit can be easily contacted.

From the lateral flank 4 of the main body 1 to the upper surface, connection lines 15 and 16 are provided in a state of being insulated from the base material 1 by a conductive film. The connection line 15 electrically connects one end 121 of the sensor line 12 to one contact region 13, and the connection line 16 electrically connects the other end 122 of the sensor line 12 to the other contact region 14. Is to be connected to. The connection lines 15 and 16 are lines that are sufficiently thicker than the width W of the sensor line 12,
The electric resistance value of the connection lines 15 and 16 is
2, which is sufficiently larger than the electric resistance value. Therefore, the connection lines 15 and 16 do not affect the detection of the change in the electric resistance value of the sensor line.

The grooving indexable insert 1 can be used by reversing left and right.
The contact area 13 provided on the upper surface shown in FIG.
The contact area 14 provided on the back surface shown in (c) also has a positional relationship that can be connected even if rotated 180 ° with respect to the center of the upper surface.

FIG. 2 is a schematic perspective view showing the manner in which the grooving indexable insert 1 shown in FIG. 1 is mounted on a holder.

At the tip of the holder 20, a chip seat 21 for mounting a chip is formed. Indexable Tip 1
Is stored in the chip seat 21 and the bottom surface 8 is abutted.
In the vicinity of the chip seat 21, a clamp member mounting hole 23 into which the clamp member 22 is inserted and screwed is provided. Clamp member 2 so as to press tip 1 from above
2 is inserted into the mounting hole 23 and screwed into a screw hole formed in the center thereof. Thereby, the throw-away tip 1 is mounted on the holder 20.

The contact areas 13 and 14 of the attached throw-away tip 1 are attached to the tip seat 21 and the clamp member 22.
A pair of probes 25 and 26 are protrudingly provided at positions opposed to. The probes 25 and 26 are elastically biased toward the tip 1 and protrude from the tip seat 21 and the clamp member 22 by, for example, several mm. Indexable Tip 1
Is mounted on the tip seat 21, the probes 25 and 26 are pushed in by the bottom and top surfaces of the throw-away tip 1, and the tips thereof are flush with the tip seat 21 and the clamp member 22. At this time, the tips of the probes 25 and 26 are in electrical contact with the contact areas 13 and 14 provided on the top and bottom surfaces of the throw-away tip 1, respectively.

As shown by a dashed line, a lead wire 28 laid in the holder 20 is connected to the probes 25 and 26, and the lead wire 28 is connected to a resistance detection circuit 29 such as an ohmmeter. ing.

Therefore, the chip seat 2 is detected by the detection circuit 29.
It is possible to measure a low resistance value of a sensor line 12 provided on a cutting blade 9 used for cutting the indexable insert 1 mounted on the cutting edge 1.

FIGS. 3 and 4 are views showing another embodiment of the contact areas 13 and 14. In FIGS.
(A) is a view from the top side, (b) is a view from the side, (c) is a view from the end face, and (d) is a view from the bottom side.

In the grooving indexable insert 1 shown in FIG. 3, the contact areas 13 and 14 connected to one end 121 and the other end 122 of the sensor line 12 are provided on the upper surface side of the main body 1. Even if the contact areas 13 and 14 and the connection lines 15 and 16 are formed in this way, the wear of the cutting blade 9 can be detected well. In this case, two probes are provided on the clamp member of the holder.

In the grooving indexable insert 1 shown in FIG. 4, the contact areas 13 and 14 connected to one end 121 and the other end 122 of the sensor line 12 are provided on the bottom side of the main body 1. Even if the contact areas 13 and 14 and the connection lines 15 and 16 are formed in this way, the wear of the cutting blade 9 can be detected well. In this case, two probes are provided on the chip seat of the holder.

Next, the base material of the throw-away tip according to the present invention and the materials and manufacturing method of the sensor line, the contact area, the connection line, and the like will be described.

As the base material of the throw-away chip, an alumina sintered body, a silicon nitride sintered body, a cermet, a cemented carbide, a cubic boron nitride sintered body (CBN / cubic)
Boron Nitride), Diamond Sintered Body (PCD / Polycrystalline Line Diameter)
ond) can be used.

[0040] Examples of the alumina sintered body, the ZrO _{2 2}
To 30% by weight, 0.01 to 5% by weight of at least one of oxides of Fe, Ni and Co, with the balance being Al ₂
Alumina sintered bodies composed of O ₃ and unavoidable impurities can be used.

As the silicon nitride sintered body, silicon nitride is used
5-96 mol%, the periodic table group 3a elements 1-5 mole% in terms of oxide, the impurity oxygen in terms of SiO ₂ 3-10
Mol%, and the content of the aluminum compound is 1% by weight or less in terms of oxide (Al ₂ O ₃ ).

As the cermet, Ti is 50 to 80% by weight in terms of carbide, nitride or carbonitride, and 10 to 40% by weight in terms of carbide of Group 6a element of the periodic table.
And 70 to 90% by weight of a hard phase component having an atomic ratio of (nitrogen / carbon + nitrogen) in the range of 0.4 to 0.6, and a binder phase component composed of an iron group metal. And 10 to 30% by weight of a TiCN-based cermet.

As the cemented carbide, there is an alloy composed of a hard phase and a binder phase, and the hard phase includes tungsten carbide,
Alternatively, tungsten carbide is formed by substituting 5 to 15% by weight of a carbide, nitride, or carbonitride of a metal of Groups 4a, 5a, and 6a of the periodic table, and the binder phase mainly includes an iron group metal such as Co. As a component, it is contained in a proportion of, for example, 5 to 15% by weight based on the total amount.

The sensor line 12 formed at the cutting edge of the throw-away tip itself has a predetermined electric resistance value. By measuring the change in the electric resistance value with an ohmmeter, it is possible to detect the degree of wear of the throw-away tip and the presence or absence of a defect.

The sensor line 12 is composed of Ti, Zr, V, N
Group 4a, 5a, 6a metals such as b, Ta, Cr, Mo, W, iron group metals such as Co, Ni, Fe or metal materials such as Al, TiC, VC, NbC, TaC, Cr
₃ C ₂ , Mo ₂ C, WC, W ₂ C, TiN, VN, NbN,
TaN, CrN, TiCN, VCN, NbCN, TaC
It is formed of carbides, nitrides, carbonitrides, (Ti, Al) N, etc. of metals belonging to groups 4a, 5a and 6a such as N and CrCN.

Among them, TiN has a strong bonding force to the base material of the throw-away tip, does not react with the work material, the electric resistance value of the sensor line 12 always shows a predetermined value, the degree of wear of the throw-away tip, It is possible to accurately detect the presence or absence of a defect, to effectively prevent the formation of a scratch due to a reaction product on the processing surface of a work material, to have excellent oxidation resistance, and to provide a sensor line 12 by generating oxide. It can be suitably used because the electrical resistance of the insert does not change, and the degree of wear of the throw-away tip and the presence or absence of a defect can be accurately detected.

This sensor line 12 is formed as follows. First, a conductive film having a predetermined thickness is applied to almost the entire surface of a base material of a throw-away chip by employing a PVD method such as a CVD method, ion plating, sputtering, or vapor deposition, or a plating method. Thereafter, the conductive film is processed into a predetermined pattern by laser processing.

When the thickness of the conductive film is less than 0.05 μm, the bonding to the base material surface is weakened and the electric resistance of the sensor line is increased. There is a danger that detection will be difficult. Further, when an attempt is made to form a conductive film having a thickness of more than 20 μm, a large stress is generated inside the conductive film at the time of formation and remains, and the bonding of the conductive film to the base material surface is weak due to the residual stress. There is a danger of doing it.

The conductive film, such as TiN, (Ti, Al) N, (Ti, Al) CN, adhered to the surface of the base material of the throw-away chip is formed by laser processing, etc.
It is processed into a predetermined pattern such as a contact area and a connection line.
When processing into a predetermined pattern by laser processing, the wavelength is 1.06 μm with respect to TiN or the like deposited on the base material surface.
m YAG laser at 35 kHz, 10 A output and 50 width
μm, irradiation scanning at a drawing speed of 100 to 300 mm / s, or an irradiation area diameter of 0.3 mm and a drawing speed of 0.3 m / m with a CO ₂ laser output of 20 W
This is performed by scanning irradiation in.

For the sensor line, etc., the base material of the throw-away chip is an alumina sintered body, a silicon nitride sintered body, cBN
When it is formed of an insulating material such as the above, it is formed directly on the surface thereof. When the base material is formed of a conductive material such as a cemented carbide or a cermet, the base material is formed with an intermediate layer made of an insulating material such as alumina interposed therebetween.

The intermediate layer made of an insulating material such as alumina serves to electrically isolate the sensor lines and the like.
The intermediate layer is formed by employing a method such as a CVD method.
A predetermined thickness is formed between the base material surface and a sensor line or the like (conductive film).

A specific method of forming the intermediate layer is as follows. When the intermediate layer is made of alumina, the base material of the throw-away chip is
It is placed in a heat-resistant alloy reaction vessel set at a temperature of about 1050 ° C. and a pressure of 6.5 kPa. Next, 40 to 50 l / min of H ₂ and ₁ to 3 l / m of CO ₂ were introduced into the reaction vessel.
in, the the AlCl ₃ 0.5~2l / min was flowed for 2 hours, to generate a Al ₂ O _3, it is performed by depositing on the surface of the base material.

If the thickness of the intermediate layer is less than 1 μm, an electrical short circuit occurs between the base material and the sensor line and the like, and the sensor line can accurately detect the degree of wear and loss of the throw-away tip. There is a risk of not being able to do so. If an intermediate layer having a thickness of more than 10 μm is to be formed, a stress is generated inside the intermediate layer during the formation and remains, and the bonding strength of the intermediate layer to the base material becomes weak due to the residual stress. There is a risk that the intermediate layer will be easily separated from the surface of the base material. Therefore, it is preferable that the thickness of the intermediate layer be in the range of 1 μm to 10 μm.

FIG. 5 is a view showing an embodiment of a grooved insert for grooving according to the second aspect. FIG. 5 (a) is a view showing a state in plan view, and FIG. 5 (b) is a side view. FIG. 5C is a view from the bottom side.

On the outer peripheral surface of the chip body 1 having a substantially plate shape,
A pair of a rake face 2 and a flank 3 formed adjacent to each other in the circumferential direction is formed at three places along the circumferential direction, and a thickness direction is set at an intersection of the rake face 2 and the flank 3 forming the pair. Cutting edge 9 is formed.

In this grooved throw-away tip,
The cutting edge 9 is formed at three places in the circumferential direction, and when rotated by 120 ° in a plan view, the cutting edge 9 at another corner can be used for cutting. Therefore, sensor lines 12 of a conductive film extending along the cutting edge 9 are provided at three locations in the circumferential direction.

The sensor line 12 is made of a conductive film having a predetermined width defined by an upper side and a lower side.
It is provided in.

The upper side of the sensor line 12 has the front cutting edge 9.
a, and is a line of a conductive film having a width W extending along the cutting edge 9 and in contact with the horizontal cutting edge 9b. In the sensor line 12,
It is provided in an electrically insulated state with respect to the chip body 1.

The width W of the sensor line 12 is equal to the life reference amount of the cutting blade 9 (the wear limit of the flank surfaces 3 and 4).
Normally, the life reference amount of the cutting edge 9 of this type of throw-away insert 1 is in the range of 0.05 to 0.7 mm.
The width W of the sensor line 12 is also set to a value equal to the life reference amount.

For example, when the wear of the flank surfaces 3 and 4 of the throw-away tip 1 results in a life of 0.2 mm, the width W of the sensor line 12 is also made to be 0.2 mm.
When cutting is performed by the cutting blades 3 and 4, wear of the cutting blade 9 and the flank 3 progresses as the processing time increases.
As the wear of the flank 3 progresses, the sensor line 12 also wears accordingly. When the wear width of the flank 3 reaches or exceeds the life reference amount, the width W corresponding to the life reference amount is obtained.
Is broken due to wear. Since the resistance values at both ends of the sensor line 12 are measured by an external circuit as described later, it is determined that the life of the cutting blade 9 has reached when the resistance value of the sensor line 12 becomes infinite. be able to.

As shown in FIG. 5 (c), a pair of six contact regions 13 and 14 are provided at a substantially central portion on the bottom surface 6 side. The six contact regions 13 and 14 are formed of a conductive film, and are provided in an insulated state with respect to the main body 1. The contact regions 13 and 14 are regions that can be electrically connected to a resistance detection circuit provided outside the holder, for example. As will be described later, when the throw-away tip 1 is mounted on the holder, the probe of the detection circuit provided in the tip pocket of the holder causes the contact area 13,
14 is electrically connected. It is preferable that the contact areas 13 and 14 are as large as possible so that a probe or the like of the detection circuit can easily contact.

From the circumferential flank surfaces 3, 4 to the bottom surface 6, the conductive film is connected to the connection line 1 in an insulated state with the base material 2.
5 and 16 are provided. The connection line 15 electrically connects one end 121 of the sensor line 12 to one contact region 13, and the connection line 16 electrically connects the other end 122 of the sensor line 12 to the other contact region 14. Is to be connected to. The connection lines 15 and 16 are lines that are sufficiently thicker than the width W of the sensor line 12, and the electrical resistance of the connection lines 15 and 16 is
Is sufficiently higher than the electric resistance value of Therefore,
The connection lines 15 and 16 do not affect the detection of the change in the electric resistance value of the sensor line.

The throw-away tip 1 is 120 °
Since it can be used by rotating, the contact areas 13 and 14 provided on the bottom surface shown in FIG. 5C also have a positional relationship of 120 ° to be rotated with respect to the center of the bottom surface.

FIG. 6 shows a method of attaching the throw-away tip shown in FIG. 5 to the holder. A tip mounting pocket 21 is formed at the tip of the holder 20.
The throw-away tip 1 is housed in the pocket 21, and the bottom surface 6 is in contact with the side wall 25 of the tip pocket 21. In the vicinity of the chip pocket 21, a clamp member mounting hole 24 into which the clamp member 23 is inserted and screwed is provided. A clamp member 23 is inserted into the mounting hole 24 so as to press the chip 1 from above, and screwed into a screw hole formed in the center thereof. Thereby, the throw-away tip 1 is mounted on the holder 20.

A pair of probes 26 and 27 project from the side wall 25 of the tip pocket 21 at positions facing the contact areas 13 and 14 of the attached throw-away tip 1. The probes 26 and 27 are elastically urged toward the tip 1 and protrude from the side wall 25 by, for example, several mm.
When the throw-away tip 1 is mounted in the pocket 21, the probes 26 and 27 are pushed in by the bottom surface 6 of the throw-away tip 1, and the tips thereof are flush with the side walls 25. At this time, the tips of the probes 26 and 27 are in contact with the contact areas 13 and 14 provided on the bottom face 6 of the throw-away tip 1.
Are in electrical contact with each other.

A lead 28 laid in the holder 20 is connected to the probes 26 and 27 as shown by a dashed line, and the lead 28 is connected to a resistance detection circuit 29 such as an ohmmeter. ing.

Therefore, the detection circuit 29 detects the pocket 2
It is possible to measure a low resistance value of a sensor line 12 provided on a cutting blade 9 used for cutting the indexable insert 1 mounted on the cutting edge 1.

In the above-mentioned indexable chip, one or both of the contact areas 13 and 14 may be formed on the peripheral surface of the chip body 1. In this case, the probe of the holder may be provided in the V-shaped portion of the chip pocket.

[0069]

As described above, according to the grooving indexable insert according to the first aspect, the conductive sensor line extending from the front flank to the lateral flank along the front cutting edge and the horizontal cutting edge. Is provided in an electrically insulated state with respect to the chip body, and on the top side and / or bottom side of the chip body,
A pair of contact areas electrically connectable to a predetermined circuit are provided in an electrically insulated state with respect to the chip body, and connect the two contact areas to one end and the other end of the sensor line, respectively. Since the two connection lines are provided on the surface of the chip main body in an electrically insulated state with respect to the chip main body, the sensor line provided on the throw-away chip is mounted on a predetermined holder. When mounted, it can be connected to a probe provided on the tip seat of the holder.

The bottom surface of the indexable insert abutting on the insert seat is not exposed to the outside, and the cutting fluid (water or oil)
And chips do not hit directly. Therefore, if a contact area that can be electrically connected to an external circuit is provided on the seating surface of the throw-away tip, the contact state between the contact area and the tip of the probe provided on the tip seat can be protected from cutting fluid and chips. Can be.

When the connection area of the throw-away tip is provided on the upper surface of the tip, a probe or the like electrically connected to the contact area of the throw-away tip can be arranged inside the holder. Therefore, the electrical connection provided on the holder is not exposed from the holder,
It is not affected by chips or cutting fluid.

Therefore, it is possible to realize a mounting structure for satisfactorily connecting the sensor line of the throw-away chip to an external circuit. As a result, the life of the indexable tip can be accurately detected using the sensor line.

In particular, by providing a sensor line near the cutting edge of the grooving indexable insert, a decrease in the blade width due to wear during processing can be monitored. for that reason,
By determining the set amount of the sensor line, it becomes possible to detect wear within the tolerance of the groove width.

Further, in the grooved insert insert, micro chipping of the front cutting edge makes the bottom surface of the groove extremely rough. However, by providing the above-described sensor line, it is possible to detect at the stage of micro chipping, and processing can be performed. The finishing state of the groove can be detected while performing.

Further, since the processing state is directly monitored, a measuring instrument or the like is not required, and this is a very effective means especially for the bottom surface of the groove.

The grooving indexable insert according to the second aspect also has the same effect as the grooving indexable tip according to the first aspect.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a throw-away tip according to claim 1, wherein (a) is a plan view of the throw-away tip, (b) is a view seen from a side,
(C) is the figure seen from the bottom face side, (d) is the figure seen from the end face side.

FIG. 2 is a view showing a state where the indexable insert shown in FIG. 1 is attached to a holder.

FIGS. 3A and 3B are diagrams showing another embodiment of the throw-away tip according to claim 1, wherein FIG. 3A is a plan view of the throw-away tip, FIG. Is a diagram viewed from the end face side.

FIGS. 4A and 4B are diagrams showing another embodiment of the throw-away tip according to claim 1, wherein FIG. 4A is a plan view of the throw-away tip, FIG.
(C) is a view seen from the end face side, and (d) is a view seen from the bottom face side.

FIGS. 5A and 5B are views showing one embodiment of the throw away tip according to claim 2, wherein FIG. 5A is a plan view of the throw away tip, FIG. It is the figure seen from the bottom face side.

6 is a view showing a state where the indexable insert shown in FIG. 5 is attached to a holder.

[Explanation of symbols]

 1 indexable insert 2 rake face 3, 4 flank face 5, 6 cutting edge 12 sensor line 13, 14 contact area 15, 16 connection line

Claims (2)

[Claims] A rake face is formed on an upper surface of at least one end of the chip body, a front flank is formed on an end face, and a lateral flank is formed on a side face, and a ridge line between the rake face and the front flank is formed. The front cutting edge is a grooving indexable insert in which a horizontal cutting edge is formed at a ridge line between a rake face and a lateral flank, and extends from the front flank to a lateral flank to form the front cutting edge and a lateral flank. A conductive sensor line extending along the cutting blade is provided in an electrically insulated state with respect to the chip main body, and can be electrically connected to a predetermined circuit on an upper surface side and / or a bottom surface side of the chip main body. Two contact areas are provided in an electrically insulated state with respect to the chip body, and two connection lines respectively connecting the two contact areas and one end and the other end of the sensor line, On the surface of the chip body, on the chip body A grooving indexable insert characterized in that it is provided in an electrically insulated state. 2. A pair of a rake face and a flank formed adjacent to each other in the circumferential direction is formed on the outer peripheral surface of the chip body having a substantially plate shape as a whole, or a plurality of pairs are formed along the circumferential direction. In a grooving indexable insert in which a cutting edge in the thickness direction is formed at an intersection of the paired rake face and flank, a conductive sensor line extending along the cutting edge on the flank Are provided in an electrically insulated state with respect to the chip main body, and two contact areas forming a pair electrically connectable to a predetermined circuit are provided on an upper surface side and / or a peripheral surface side of the chip main body, Two connection lines, which are provided in an electrically insulated state with respect to the chip main body and connect the two contact areas and one end and the other end of the sensor line, respectively, are provided on the surface of the chip main body and on the chip main body. Electrically isolated from A throwaway tip for grooving characterized by being provided in a state.