JP4105854B2 - Method for manufacturing throw-away tip - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away tip used for cutting and a manufacturing method thereof, and more particularly, to a throw-away tip in which a sensor line for detecting wear of a cutting edge is formed on a flank and a manufacturing method thereof.
[0002]
[Background Art and Problems to be Solved by the Invention]
In the throw-away tip, a cutting edge is usually formed at each corner portion of a substantially flat base material based on a quadrangle or a triangle. If the cutting edge ridge of any corner portion wears, the cutting edge ridge of the other corner portion is used. The throw-away tip is replaced when the cutting edge of all corners is worn.
[0003]
By the way, it is not easy to examine how much the cutting edge of the throw-away tip is worn. In particular, it is difficult to detect the wear amount of the cutting edge ridge without interrupting the cutting process during the cutting process.
[0004]
For example, when a sensor line is formed on the flank in the vicinity of the edge of the cutting edge to detect wear, it is necessary to provide a sensor line equal to all of the flank and the adjacent flank. As a method of forming a sensor line on the flank, one or both of the inscribed circles at the intersection of the rake face and the flank are sandwiched with a jig, and the sensor line is placed on one flank using a laser or the like. After forming by removing unnecessary portions, a similar sensor line is formed by rotating the throw-away tip to an angle at which a laser or the like can be irradiated to the adjacent flank. The flank is formed by irradiating a laser with the necessary number of rotations. At this time, since the rake face has a substantially planar shape, if a slight center misalignment occurs, the sensor line is misaligned at all corners, and a different pattern is formed at each flank. End up.
[0005]
The present invention has been made in view of such problems of the prior art, and forms a sensor line by rotating the rake face of the throw-away tip to an angle at which a laser or the like can be irradiated with a jig interposed therebetween. In this case, an object of the present invention is to provide a throw-away tip that eliminates the occurrence of misalignment of the sensor line due to the center misalignment of pinching.
[0006]
[Means for Solving the Problems]
To achieve the above object, the throw-away tip according to claim 1. Manufacturing method Has a rake face on one main surface of the substantially flat base material, a seating surface on the other main surface, a flank surface on the side surface, and an intersection ridge between the rake surface and the flank surface. A throw-away tip with a cutting edge formed and a sensor line that detects the wear of the cutting edge on the flank surface near the cutting edge Manufacturing method In Forming a conductive film on the surface of the base material; Of the base material At least one A recess or a recess in the center of the inscribed circle at the intersection ridge of the main surface and the flank Through hole Provided And a step of bringing a pair of plunger pins into contact with the recess or the through hole, and sandwiching the base material from both the scooping surface and the seating surface by the pair of plunger pins, and the base material by centripetal effect And a step of moving the central axis of the pair of plunger pins substantially in a straight line, a step of forming a sensor line pattern by removing the conductive film by laser irradiation on the side surface of the base material, and , Rotating the base material by a predetermined angle with respect to the central axis of the pair of plunger pins, and removing the conductive film by laser irradiation on the other side surface of the base material to form a sensor line pattern And comprising It is characterized by that.
[0007]
A recess provided in the approximate center of the inscribed circle at the intersection of the rake face and the flank Through hole By pinching this recess or Through hole Due to the centripetal effect, the throwway tip or jig moves to each apex or bottom point, and the position is accurately corrected even if the throwaway tip is slightly displaced.
[0008]
The throw-away tip according to claim 2 is a semi-spherical recess at substantially the center of the inscribed circle of the intersection ridge with the flank of the throw-away tip. The It has a centripetal effect.
[0009]
The throw-away tip according to claim 3 is a concave portion having a polygonal planar shape at the substantially center of the inscribed circle at the intersection ridge with the flank of the throw-away tip. The It has a centripetal effect.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the invention will be described with reference to the drawings.
[0013]
FIG. 1A is a perspective view of a throw-away tip 1 according to an embodiment of the present invention as viewed from the upper front side, and FIG. 1B is a perspective view of the throw-away tip 1 as viewed from the lower front side. . The base material 2 of the throw-away tip 1 has a substantially flat plate shape (substantially rectangular parallelepiped shape). Although the base material 2 is not originally distinguished from upper and lower, for convenience of explanation, one will be described below with the upper surface as the upper surface and the other as the lower surface.
[0014]
A rake face 5 is formed on the upper surface of the base material 2, and a lower surface of the base material 2 is a seating surface 6. Further, flank surfaces 8 are formed on the four side surfaces of the base material 2, respectively. A cutting edge ridge 9 is formed by the intersecting ridge of the rake face 5 and each flank face 8. Furthermore, the intersection of the rake face 5 and the two adjacent flank faces 8 forms a corner that can be used for cutting.
[0015]
In the center of the base material 2, a clamp hole 11 penetrating from the upper surface to the lower surface is formed. The throw-away tip 1 is attached to a holder or the like by being pressed by a clamper. In the mounted state, for example, the upper cutting edge 9 in FIG. 1A is used for cutting. Further, when the clamp screw is loosened and the throw-away tip 1 is rotated by 90 °, the cutting edge 9 of another corner portion can be used for cutting. In this way, by rotating the throw-away tip 1 by 90 °, the four corners on the upper surface side can be used sequentially for cutting.
[0016]
Furthermore, by turning the throw-away tip 1 upside down and attaching it to a holder or the like, the four corners on the lower surface side in FIGS. 1A and 1B can be used for cutting in order. When the lower surface side corner portion is used, the upper surface serves as a seating surface, and the lower surface functions as a rake surface. In this way, the throw-away tip 1 can use each of the eight corner portions of the rectangular parallelepiped base material 2 for cutting.
[0017]
For this reason, the sensor lines 12 of the conductive film extending along the cutting edge ridge 9 are respectively provided in the eight corner portions. Specifically, it extends along the cutting edge ridge line 9 so as to surround the corner portion 10 on the two flank faces 8 forming the corner portion 10. The upper side of the sensor line 12 is in contact with the cutting edge ridge line 9 and is a conductive film line having a width W extending along the cutting edge ridge 9. The sensor line 12 is provided in an electrically insulated state with respect to the base material 2.
[0018]
The width W of the sensor line 12 matches the life reference amount of the corner portion 10 (the wear limit of the flank 8). Normally, the life reference amount of the corner portion 10 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 also equal to the life reference amount. .
[0019]
For example, when the wear of the flank 8 of the throw-away tip 1 has a lifetime of 0.2 mm, the width W of the sensor line 12 is also set to 0.2 mm. When cutting is performed by the corner portion 10, wear of the cutting edge ridge 9 and the flank 8 proceeds with an increase in processing time. As wear of the flank 8 progresses, the sensor line 12 wears accordingly. When the wear width of the flank 8 reaches the life reference amount or more, the sensor line 12 having the width W corresponding to the life reference amount is disconnected due to wear.
[0020]
Since the resistance values at both ends of the sensor line 12 are measured by an external circuit as will be described later, the cutting edge ridge 9 of the corner portion 10 has reached the end of its life when the resistance value of the sensor line 12 becomes infinite. Can be determined.
[0021]
As shown in FIG. 1B, the seating surface 6 is provided with two contact regions 13 and 14 that make a pair. The two contact regions 13 and 14 are formed of a conductive film and are provided in an insulated state with respect to the base material 2. The contact regions 13 and 14 are regions that can be electrically connected to, for example, a resistance value detection circuit provided outside the holder. As will be described later, when the throw-away tip 1 is mounted on the holder, the probe of the detection circuit provided on the tip seat of the holder is electrically connected to the contact regions 13 and 14. The contact areas 13 and 14 are preferably as large as possible so that the probe of the detection circuit and the like can be easily contacted.
[0022]
Connection lines 15 and 16 are provided from the flank 8 of the base material 2 to the seating surface 6 by a conductive film in an insulated state from the base material 2. The connection line 15 electrically connects one end 121 of the sensor line 12 and one contact region 13, and the connection line 16 electrically connects the other end 122 of the sensor line 12 and the other contact region 14. To do. The connection lines 15 and 16 are sufficiently thick lines compared to the width W of the sensor line 12, and the electrical resistance values of the connection lines 15 and 16 are sufficiently larger than the electrical resistance value of the sensor line 12. Therefore, the connection lines 15 and 16 do not affect the detection of the change in the electrical resistance value of the sensor line.
[0023]
The connection line 16 connected to the other end 122 of the sensor line 12 has a folded line 17 at a part thereof. The folding line 17 is connected to the other end 122 of the sensor line 12 at the folding part 18. The folding line 17 extends in parallel with the sensor line 12 with a predetermined distance D from the sensor line 12. By connecting the negative portion of the connection line 16 to the folding line 17, the connection line 15 and the connection line 16 can be provided on the flank 8 in parallel at a predetermined interval, and the connection lines 15 and 16 are arranged with high area efficiency. There is an advantage that you can.
[0024]
The distance D between the sensor line 12 and the folding line 17 is 0.05 mm or more. Preferably, the width D should be as wide as possible. This is because when the corner portion 10 is cut, the workpiece is cut by the cutting edge ridge 9 included therein. The shaved chips are generated from the rake face 5 toward the flank face 8, for example, while curling. There is a possibility that the generated chips adhere between the sensor line 12 and the folding line 17 and can be electrically short-circuited between the two lines.
[0025]
Therefore, by increasing the distance D between the sensor line 12 and the folding line 17, it is possible to prevent the two lines 15 and 16 from being electrically short-circuited due to adhesion of chips or the like. The two connection lines 15 and 16 formed on the flank 8 are inclined not in a direction orthogonal to the sensor line 12 (in other words, with respect to the cutting edge 9) but in a direction intersecting at a predetermined inclination angle. It is said to be a line. This is because the arrangement positions of the contact areas 13 and 14 provided on the seating surface 6 which is the lower surface and the arrangement positions of the contact areas 13 and 14 provided on the upper surface are exactly the same.
[0026]
More specifically, the four corner portions 10 located on the upper surface side in FIG. 1A can be used for cutting sequentially by rotating the throw-away tip 1 by 90 °. When the throw-away tip 1 is rotated by 90 °, the four pairs of contact areas 13 and 14 shown in FIG. 1B are also rotated by 90 ° in order. The contact areas 13 and 14 connected to the sensor line 12 of the corner portion 10 used for cutting are connected to a probe of an external circuit. For this reason, the four pairs of contact areas 13, 14 provided on the seating surface 6 are in a positional relationship of 90 ° with respect to the center of the seating surface 6.
[0027]
Since the throw-away tip 1 can be used upside down, the four pairs of contact areas 13 and 14 provided on the upper surface shown in FIG. 1A are also rotated by 90 ° with respect to the center of the upper surface. The positional relationship is Thus, in order to arrange the contact regions 13 and 14 provided on the upper surface and the contact regions 13 and 14 provided on the lower surface in exactly the same arrangement, the connection lines 15 and 16 need to be provided obliquely on the flank 8. .
[0028]
In addition, in the case of a throw-away tip that uses only one side (for example, the upper surface) corner portion called a so-called positive type for cutting, the connection lines 15 and 16 may not be provided obliquely on the flank 8.
[0029]
FIG. 2 is a plan view showing a modified example of the four pairs of contact areas 13 and 14 provided on the seating surface 6 of the throw-away tip 1. The seating surface 6 is provided with four pairs of contact areas 13 and 14, and each corresponding corner portion is brought into contact with a probe of an external circuit when used for cutting.
[0030]
By the way, when the contact regions 13 and 14 are connected to an external circuit and the electrical resistance value of the sensor line 12 is measured, a predetermined voltage is applied to the one contact region 13 from the external circuit, and the other contact region. 14 is connected to the ground potential of the external circuit. That is, regardless of which pair of contact areas 13, 14 is used, one contact area is connected to ground potential. Therefore, for example, the contact region 14 may be used as the ground potential, and one of the four contact regions 14 may be electrically connected in common. An example of such a configuration is shown in FIG.
[0031]
The shape of such a connection region is such that when a conductive film is formed on the entire seating surface 6 and the film is processed with a laser to form the contact regions 13, 14 and the connection lines 15, 16, etc. There is an advantage that processing time can be shortened. This is because the area of the conductive film to be removed by laser processing is small.
[0032]
FIG. 3 is a perspective view showing another embodiment of the sensor line. The sensor line 12 described with reference to FIG. 1 has its upper side in contact with the cutting edge ridge 9 and extends in parallel to the cutting edge ridge 9 with a width W so as to surround the corner portion 10. On the other hand, the sensor line 123 in FIG. 3 has a width of X (W> X) and is narrower than the sensor line 12. Similarly to the sensor line 12, the sensor line 123 is formed of a conductive film in an insulating state on the base material 2. The sensor line 123 extends in parallel to the cutting edge ridge 9 such that the lower side thereof, that is, the side edge 124 far from the cutting edge ridge 9 is a distance W from the cutting edge ridge 9.
[0033]
This distance W is equal to the life reference amount of the flank 8 similarly to the width W of the sensor line 12 described in FIG. Therefore, as the usage time of the cutting edge ridge 9 increases, the wear of the flank 8 proceeds from the cutting edge ridge 9 side, and eventually the wear reaches the sensor line 123 and the lower side 124 thereof. Then, the sensor line 123 is disconnected. As described above, the sensor line 123 may be configured such that the side (lower side) 124 far from the cutting edge ridge 9 is separated from the cutting edge ridge 9 by a predetermined distance W.
[0034]
1 and 3, the case has been described in which the distance W from the cutting edge 9 to the lower side of the sensor line is equal to the life reference amount of the corner portion 10 (the wear limit of the flank 8).
[0035]
However, this dimension W is not the wear limit of the flank 8 and may be a dimension related to wear of the flank 8. For example, in the case of preliminary cutting (rough cutting) or standard cutting, the wear limit of the flank 8 is relatively large, but in finish cutting, the throw-away tip needs to be replaced when the flank 8 is worn to some extent. In accordance with such a situation, the dimension W can be used as a throw-away tip, but it may be a dimension that can detect wear that cannot be used for finish cutting.
[0036]
FIG. 4 is a schematic perspective view showing a state in which the throw-away tip 1 shown in FIGS. 1A and 1B is attached to a holder.
[0037]
A tip mounting pocket 21 is formed at the tip of the holder 20. The bottom surface of the pocket 21 is a chip seat 22. Further, the side surface of the pocket 21 is in contact with the side surface of the chip and serves as a restraining surface 23 for restraining the chip. The throw-away tip 1 is stored in the pocket 21, and the seating surface 6 is brought into contact with the tip seat 22. Further, the side surface is brought into contact with the restraining surface 23. Then, a clamp screw 24 is inserted into the clamper 11 from above, and its tip is screwed into a screw hole 25 formed in the holder 20. As a result, the throw-away tip 1 is attached to the holder 20.
[0038]
A pair of probes 26 and 27 protrude from the tip seat 22 at positions facing the contact areas 13 and 14 connected to the sensor line 12 provided in the corner portion 10 used for cutting the mounted throw-away tip 1. It is installed. The probes 26 and 27 are elastically biased upward and protrude from the tip seat 22 by, for example, several mm.
[0039]
When the throw-away tip 1 is mounted in the pocket 21, the probes 26 and 27 are pushed down by the seating surface 6 of the throw-away tip 1, and the upper ends thereof are flush with the tip seat 22. At this time, the upper ends of the probes 26 and 27 are in electrical contact with the contact areas 13 and 14 provided on the seating surface 6 of the throw-away tip 1.
[0040]
The probes 26 and 27 are connected to a lead wire 28 disposed in the holder 20 as indicated by a one-dot chain line, and the lead wire 28 is connected to a resistance value detection circuit 29 such as an ohmmeter. .
[0041]
Therefore, the detection circuit 29 can measure the resistance value of the sensor line 12 provided in the corner portion 10 used for cutting the throw-away tip 1 mounted in the pocket 21.
[0042]
In the state where the throw-away tip 1 is mounted in the pocket 21, the seating surface 6 of the throw-away tip 1 is in close contact with the tip seat 22. For this reason, even if cutting fluid (water or oil) is applied to the tip of the holder 20 at the time of cutting, or even if chips scraped by the throw-away tip 1 are scattered around the throw-away tip 1, these cuttings are performed. The liquid and chips do not enter between the chip seat 22 and the seating surface 6 that are in close contact with each other. That is, the seating surface 6 and the tip seat 22 of the throw-away tip 1 are protected from the cutting fluid and chips. Therefore, the probes 26 and 27 provided on the chip seat 22 and the contact areas 13 and 14 provided on the seating surface 6 are in a state in which electrical connection is well maintained even during cutting.
[0043]
Furthermore, the probes 26 and 27 and the lead wires 28 connected thereto can be provided in the holder 20.
[0044]
The holder 20 shown in FIG. 4 is only an example. As a holder to which the throw-away tip 1 according to this embodiment can be attached, for example, the prior application (Japanese Patent Application No. 11-277548) of the applicant of the present application is used. May be.
[0045]
FIG. 5 (a) shows a throw-away tip provided with a spherical recess 30 substantially at the center of the inscribed circle at the intersection of the substantially flat rake face 5 and the seating face 6 and the flank 8, and the throw-away tip. Plunger pins 33a and 33b are provided for sandwiching from both the rake face 5 and the seating face 5 of the chip. The tip shapes of the plunger pins 33a and 33b are spherical convex shapes so as to contact the spherical concave portion 30 of the rake face 5.
[0046]
In FIG. 5A, the center axis 31 of the spherical recess 30 of the rake face 5 of the chip 1 and the center axis 34 of the plunger pins 33a and 33b are shifted. However, as shown in FIG. When the tip portions 32a and 32b of the pins come into contact with the spherical concave portion 30 of the rake face 5 of the chip 1, the central axes 31 and 34 move to a substantially straight central axis by the centripetal effect. If the mutual positional relationship coincides, the laser irradiation 35 and the sensor line 12 can be accurately drawn on the adjacent flank 8.
[0047]
If the tip of one plunger pin 33a has a spherical shape, the above effect is sufficient even if the other has a planar shape. The tip of the plunger pins 33a, 33b is also effective when it is conical or polygonal.
[0048]
FIG. 6 shows a concave shape in the center of the inscribed circle of the rake face 5 and the intersecting ridge of the seating face 6 and the flank face 8. Part This is an application example of a throw-away chip provided with 30.
Concave provided at the approximate center of the inscribed circle at the intersection Part 30 to prevent the throw away tip from being slightly displaced. Part The position is accurately corrected by the centripetal effect of 30.
Concave Part The shape of 30 is not limited to the spherical shape as shown in FIGS. 6 (a) and 6 (b), and may be a triangle or a polygon as shown in FIGS. 6 (c) to 6 (p).
Further, the planar shape of the base material 2 is not limited to a quadrangle as shown in FIGS. 6A to 6H or a triangle as shown in FIGS. 6I to 6P, but a circular or elliptical throwaway tip. The present invention can also be applied to the above.
[0049]
Next, materials and manufacturing methods for the base material, sensor line, connection region, side line and the like of the throw-away chip according to the present invention will be described.
[0050]
As the base material of throw-away tip, alumina sintered body, silicon nitride sintered body, cermet, cemented carbide, cubic boron nitride sintered body (CBN / cubic Boron Nitride), diamond sintered body (PCD) / Polycrystalline Diamond) can be used.
[0051]
The sensor line 12 formed on the cutting edge portion of the throw-away tip itself has a predetermined electric resistance value. By measuring the change in the electrical 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.
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, indicates the wear degree of the throw-away tip, and whether or not there is a defect It can be accurately detected, can effectively prevent formation of scratches due to reaction products on the work surface of the work material, has excellent oxidation resistance, and changes in the electrical resistance value of the sensor line 12 due to oxide generation Therefore, it can be suitably used for the reason that it is possible to accurately detect the degree of wear of the throw-away tip and the presence or absence of a defect.
[0052]
The sensor line 12 is made as follows. First, a conductive film having a predetermined thickness is deposited on almost the entire surface of the base material of the throw-away chip by employing a CVD method, a PVD method such as ion plating, sputtering, vapor deposition, or a plating method. Thereafter, the conductive film is processed into a predetermined pattern by laser processing.
[0053]
If the conductive film is thin with a thickness of less than 0.05 μm, the bonding to the surface of the base material becomes weak and the electrical resistance value of the sensor line 12 increases, so that the degree of wear or chipping of the throw-away tip can be accurately detected. There is a risk that it will be difficult to do. Also, if a conductive film exceeding 20 μm is formed, a large stress is generated inside the conductive film at the time of formation and remains, and the residual stress results in weak bonding of the conductive film to the base material surface. There is a risk of end.
[0054]
Conductive films such as TiN, (Ti, Al) N, and (Ti, Al) CN deposited on the base material surface of the throw-away chip are connected to the sensor line 12, the connection regions 13 and 14, and the connection by laser processing or the like. It is processed into a predetermined pattern such as lines 15, 16, 17. In the case of processing into a predetermined pattern by laser processing, a YAG laser with a wavelength of 1.06 μm is applied to TiN or the like deposited on the surface of the base material with a width of 50 μm at an output of 35 kHz and 10 A, and a drawing speed of 100 to 300 mm / s. By scanning with irradiation, or by CO ₂ This is performed by irradiating and scanning a laser with an output of 20 W at an irradiation area diameter of 0.3 mm and a drawing speed of 0.3 m / min. The sensor line 12 and connection lines 15, 16, and 17 formed on the flank are depicted with a laser in a state where both main surfaces of the base material are sandwiched and fixed by a plunger, and then rotated by a predetermined angle so that the other flank is A laser is drawn on the flank faced against the laser, and further rotated by a predetermined angle to draw a laser on the next flank face.
[0055]
In this case, the concave provided at the center of the rake face Part Instead of 30, a through hole may be provided. In this case, if the diameter of the through hole is smaller than the diameter of the plunger, the through hole functions in the same manner as the recess 30 described above. Moreover, if it is a through-hole, it can also be used as a clamp hole for fixing a throw away tip with a clamp screw.
[0056]
When the base material of the throw-away chip is formed of an insulator such as an alumina sintered body, a silicon nitride sintered body, or cBN, the sensor line 12 and the like are directly formed on the surface thereof. When the base material is formed of a conductive material such as cemented carbide or cermet, the base material is formed with an intermediate layer made of an insulator such as alumina interposed therebetween.
[0057]
The intermediate layer made of an insulator such as alumina functions to make the sensor line and the like electrically independent. The intermediate layer is formed with a predetermined thickness between the surface of the base material and the sensor line or the like (conductive film) by employing a method such as a CVD method. 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 sensor line can accurately detect the wear degree of the throw-away tip and the chipping. There is a risk of disappearing. Further, if an intermediate layer exceeding 10 μm is formed, stress is generated and remains in the intermediate layer during the formation, and the residual stress weakens the bonding strength of the intermediate layer to the base material, and even when a small external force is applied. There is a risk that the intermediate layer is easily peeled off from the surface of the base material. Therefore, the intermediate layer preferably has a thickness in the range of 1 μm to 10 μm.
[0058]
【The invention's effect】
As described above, according to the throw-away tip according to claim 1, , This recess or Through hole As a result of the centripetal effect, the slow way tip or jig moves to each apex or bottom point, and the position is accurately corrected even if the throw away tip is slightly displaced. Therefore, when the sensor line is formed by turning the rake face of the throw-away tip with a jig and rotating it to an angle that can be irradiated with a laser, etc., the sensor line can be accurately positioned without causing a center misalignment. Can be formed.
[Brief description of the drawings]
1A and 1B are views showing an embodiment of a throw-away tip according to the present invention, in which FIG. 1A is a perspective view seen from the upper front side, and FIG. 1B is a perspective view seen from the lower front side;
FIG. 2 is a view showing another embodiment of the throw-away tip according to the present invention, and is a view of the throw-away tip as viewed from above.
FIG. 3 is an enlarged view showing a cutting edge portion of the throw-away tip according to the present invention.
FIG. 4 is a view showing a state in which the throw-away tip according to the present invention is mounted on a holder.
FIGS. 5A and 5B are diagrams showing a method for manufacturing a throw-away tip according to the present invention, in which FIG. 5A shows a state in which the central axes of the throw-away tip and the plunger pin are shifted, and FIG. The center axis is in alignment.
FIG. 6 is a view showing another embodiment of the shape of the concave portion or convex portion of the throw-away tip and the base material according to the present invention.
[Explanation of symbols]
1: throwaway tip, 2: base material, 5: rake face, 6: seating face, 8: flank face, 9: cutting edge, 10: corner portion, 12: sensor line, 13, 14: connection area, 15 , 16: connection line, 33: plunger pin

Claims (3)

It has a rake face on one main surface of the substantially flat base material, a seating surface on the other main surface, a flank surface on the side surface, and a cutting edge at the intersection ridge of the rake surface and the flank surface In the manufacturing method of the throw-away tip provided with a sensor line for detecting wear of the cutting edge on the flank near the cutting edge,
Forming a conductive film on the surface of the base material;
A step of Ru a recess or through-hole approximately at the center of the inscribed circle of the cross edges of the at least one main face and the flank of the base material,
A pair of plunger pins are brought into contact with the recess or the through hole, and the base material is sandwiched from both the scoop surface and the seating surface by the pair of plunger pins, and a center axis of the base material is obtained by a centripetal effect. , Moving the central axes of the pair of plunger pins substantially in a straight line;
Removing the conductive film on the side surface of the base material by laser irradiation to form a sensor line pattern; and
Rotating the base material by a predetermined angle with respect to the central axis of the pair of plunger pins, removing the conductive film by laser irradiation on the other side surface of the base material, and forming a sensor line pattern; A method for manufacturing a throw-away tip. The method for manufacturing a throw-away tip according to claim 1, wherein the concave portion is hemispherical. The method for manufacturing a throw-away tip according to claim 1, wherein the planar shape of the recess is a polygon .

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