JP2007130719A - Throw-away tip and grinding method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throw-away tip and a grinding method for it, achieving compatibility between high accuracy and mass productivity. <P>SOLUTION: In this throw-away tip 1, a cutting blade 5 is formed on at least one ridge part of ridge parts of intersecting upper and side surfaces, a cutting face 2 is formed on the upper surface extended from the cutting blade 5, a flank 4 is formed on the side surface extended from the cutting blade 5, and further fitting reference surfaces 6a, 6b for positioning the cutting blade 5 in a predetermined position are formed on at least one side surface. A recessed part 7A recessed from at least one surface of the upper surface and the lower surface or a projecting part projected from that is formed, and the inner wall surface of the recessed part 7A or the outer peripheral surface of the projecting part is provided with grinding reference surfaces 7a, 7b formed for reference to grinding in grinding the fitting reference surfaces 6a, 6b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a throw-away tip with high accuracy and excellent mass productivity and a grinding method thereof.

In order to increase the accuracy of a throw-away tip (hereinafter referred to as “chip”) made of a hard material such as cemented carbide, cermet, ceramics, or an ultra-high pressure sintered body such as a diamond sintered body or a cBN sintered body, Conventionally, the upper and lower surfaces and all the outer peripheral surfaces are ground. Such a chip is illustrated in FIGS. The chip 3 shown in these figures is a chip that sandwiches the lower surface 7 and the upper surface with the chucking device 2 and performs side grinding, and the shape of the edge of the chip 3 is a plan view outline of the chip 3 at the center of the lower surface 7 or the upper surface. It has a similar shape and has a weight-like posture correcting concave portion 12 that gradually increases in depth from the edge portion toward the center portion, and centering rods 2a and 2b included in the chucking device 2 in the posture correcting concave portion 12. The tip protrusion 13 having a shape corresponding to the above is taper-fitted to perform centering and posture correction during side grinding (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 61-178602

However, the conventional chip has a problem that it takes a long time to grind the outer peripheral surface and the mass productivity is low. In particular, in a chip having a thread cutting edge for performing thread cutting, the shape of the side surface connected to the thread cutting edge is complicated, and the time required for grinding becomes long, so the above problem is serious.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a chip that achieves both high accuracy and mass productivity and a grinding method thereof.

In order to solve the above-described problem, the first invention includes an upper surface, a lower surface, and a plurality of side surfaces, and a cutting edge is formed on at least one ridge side portion of the ridge side portions where the upper surface and the side surface intersect. A rake face is formed on an upper surface extending from the cutting edge, and a flank face is formed on a side face extending from the cutting edge. Further, at least one side face is mounted for positioning the cutting edge at a predetermined position. In the throw-away tip formed with a reference surface, a recessed portion or a protruding convex portion that is recessed from at least one surface of the upper surface and the lower surface is formed, and the inner wall surface of the concave portion or the outer peripheral surface of the convex portion, When the mounting reference surface is ground, a grinding reference surface serving as a reference for the grinding is formed.

Moreover, 2nd invention has an upper surface, a lower surface, and a side surface, a cutting blade is formed in at least 1 ridge side part among the ridge side parts where the said upper surface and the said side surface cross | intersect, and the upper surface extended from the said cutting blade A rake face is formed, a flank face is formed on a side surface extending from the cutting edge, and an attachment reference surface for positioning the cutting edge at a predetermined position is formed on at least one side face. In the throwaway tip grinding method, the reference mounting surface is based on the grinding reference surface formed on the inner wall surface of the recess recessed from the surface of the upper surface or the lower surface of the throwaway tip or on the outer peripheral surface of the protruding convex portion. It is characterized by grinding.

Moreover, 3rd invention has an upper surface, a lower surface, and a side surface, a cutting blade is formed in at least 1 ridge side part among the ridge side parts where the said upper surface and the said side surface cross | intersect, and the upper surface extended from the said cutting blade A rake face is formed, a flank face is formed on a side surface extending from the cutting edge, and an attachment reference surface for positioning the cutting edge at a predetermined position is formed on at least one side face. In the throwaway tip grinding method, the reference mounting surface is based on the grinding reference surface formed on the inner wall surface of the recess recessed from the surface of the upper surface or the lower surface of the throwaway tip or on the outer peripheral surface of the protruding convex portion. , And all or part of the flank face is ground with reference to the ground attachment reference surface.

According to the first aspect of the present invention, the concave portion or the protruding convex portion that is depressed from the surface of the upper surface or the lower surface of the chip is formed, and the mounting reference surface is ground on the inner wall surface of the concave portion or the outer peripheral surface of the convex portion. At this time, since a grinding reference surface serving as a reference for the grinding process is formed, a highly accurate chip can be provided.

According to the second invention, the mounting reference surface is grounded with reference to the grinding reference surface formed on the inner wall surface of the recess recessed from the surface of the upper surface or the lower surface of the chip or the outer peripheral surface of the protruding protrusion. Therefore, a highly accurate chip grinding method can be provided. In addition, since the side surface extending from the cutting edge is not ground, the time required for grinding is shortened and the mass productivity of the chip is increased.

According to the third invention, the mounting reference surface is ground on the basis of the grinding reference surface formed on the inner wall surface of the recess recessed from the surface of the upper surface or the lower surface of the chip or the outer peripheral surface of the projecting protrusion. In addition to the effect of the second invention, the precision of the cutting edge can be further improved because all or part of the flank face is ground with reference to the ground mounting reference surface.

1st invention WHEREIN: When all or a part of the flank formed in the side surface extended from the said cutting blade is comprised by the raw material surface by press baking, all or a part of the said flank is ground. Since it is not necessary, the time required for grinding is further shortened and the mass productivity of the chip is greatly improved.

Further, the concave portion or the convex portion has a rotationally symmetric shape having an axis extending in the vertical direction, a polygonal pyramid shape, a polygonal frustum shape or a polygonal column shape, or extends in the horizontal direction and is orthogonal to the extending direction. It is at least one shape selected from concave grooves or ridges that form a trapezoidal shape, a triangular shape, a rectangular shape, an arc shape, or a curved shape in cross section, and one of the inner wall surface of the concave portion and the outer peripheral surface of the convex portion Is the grinding reference surface. The grinding reference surface formed on the inner wall surface of the concave portion or the outer peripheral surface of the convex portion selected from these shapes can be engaged with the engaging portion of the clamp rod of the chucking device, and is automatically attached by the engagement. Since the reference surface is accurately positioned, grinding accuracy of the mounting reference surface is improved. The rotationally symmetric shape having an axis extending in the vertical direction indicates a conical shape, a truncated cone shape, a cylindrical shape, a spherical shape, or the like.

Furthermore, when the cutting blade is a thread cutting blade for threading, the time for grinding a complicated flank is omitted, and the effect of improving the mass productivity of the chip becomes remarkable.

Next, an embodiment in which the chip of the present invention is applied to a chaser will be described with reference to the drawings. FIG. 1 is a plan view of a chaser according to an embodiment. FIG. 2 is a bottom view of the chaser shown in FIG. 3 is a cross-sectional view taken along line S1-S1 and a cross-sectional view taken along line S2-S2 in FIG. 4 and 5 are diagrams showing a modification of the present embodiment, which corresponds to FIG. FIG. 6 is a view showing a state where the chaser shown in FIG. 1 is chucked by the chucking device, and corresponds to FIG. FIG. 7 is a view schematically showing a state in which threads are machined on the outer peripheral surface of the end portion of the oil well pipe using the chaser shown in FIG. In FIG. 1, the chaser 1 has a substantially rectangular plate shape, and is made of a hard material press-fired such as cemented carbide, cermet, ceramics, etc. As shown in FIG. The lower surface parallel and flat with the upper surface serves as a seating surface 3 for seating on the chip seat 11 of the die head 10, and a predetermined thread or screw is attached to the oil well pipe at one ridge side portion of the pair of long sides of the upper surface. A cutting blade 5 made up of three thread cutting blades forming a trapezoidal shape for cutting a groove is formed. In the following description, the thickness direction of the chaser 1 is defined as the vertical direction, the direction perpendicular to the thickness direction is defined as the horizontal direction, the extending direction of the long side of the upper surface of the substantially rectangular shape is the width direction, and the extending direction of the short side is the height. The direction.

When the chaser 1 is attached to the die head 10, the rough blade 5a, the intermediate finishing blade 5b, and the finishing blade 5c constituting the cutting blade 5 increase in thread height sequentially from the front side to the rear side in the tool feed direction F. These are formed side by side at a predetermined pitch interval so as to share the cuts in the height direction (thread height direction) and the width direction (thread width direction). The flank 4 formed on the side surface that continues to the cutting edge 5 has a positive flank angle that inclines inwardly toward the seating surface 3 from the cutting edge 5. The side surface facing the flank 4 and the side surface facing the rear side in the tool feed direction F are the attachment reference surfaces 6a and 6b, respectively, which intersect each other at right angles, and when the chaser 1 is clamped to the die head 10, the cutting edge 5 It becomes a reference plane for positioning at a predetermined position. In this embodiment, since the cutting blade 5 is composed of three screw threads having different shapes in plan view, the cutting point 5 is located on the same plane as the rake face, and the imaginary point of the corner on the rear side in the tool feed direction F of the finishing blade 5c. Is the reference point 5d.

The characteristic configuration of the present chaser 1 is as follows. In the press firing step of the present chaser 1, a first recess 7 </ b> A and a second recess 7 </ b> B that are recessed from the surface of the lower surface are formed on the lower surface that becomes the seating surface 3. As can be seen from FIGS. 2 and 3, the first recess 7 </ b> A has a truncated cone shape having an axial center P <b> 1 extending in the vertical direction and an apex angle of the cone of 2α. The second concave portion 7B is a concave groove extending in the horizontal direction along a center line CL1 parallel to the attachment reference surface 6a, and an angle formed between the inner walls of the second concave portion 7B in a cross section perpendicular to the center line CL1 is 2α. And a trapezoidal shape having a symmetric cross-sectional shape with respect to a vertical line intersecting the center line CL1. Further, the axis P1 of the first recess 7A is on an extension line of the center line CL1 of the second recess 7B, and both the recesses 7A and 7B are in a relationship parallel to the attachment reference plane 6a. The reference point 5d of the cutting blade 5 is set to a predetermined height dimension H1 and a predetermined width dimension W1 with respect to the axis P1. Further, the respective mounting reference surfaces 6a and 6b after the grinding process with the axis P1 as a reference are set to a predetermined height dimension H2 and a predetermined width dimension W2. In the present chaser 1, the inner peripheral surface in the cross section cut along the plane passing through the axis P1 of the first recess 7A and the inner wall surface in the cross section cut along the plane orthogonal to the center line CL1 of the second recess 7B have the same cross section. It becomes the shape, and becomes the grinding reference surfaces 7a and 7b which become the reference when grinding the mounting reference surfaces 6a and 6b, respectively. In addition, the cross-sectional shape of the inner peripheral surface and inner wall surface of each recessed part 7A, 7B does not necessarily need to correspond, and may differ. Further, the cross-sectional shape forming the trapezoidal shape of the concave portion of the second concave portion 7B may be left-right asymmetrical. Is desirable. Moreover, although it is not specifically limited whether each recessed part 7A, 7B is opened to the side surface of the chaser 1, In order to avoid the strength fall of the cutting blade 5, it is desirable not to open to the side surface in which the flank 4 was formed.

Instead of the concave portions 7A and 7B, a convex portion protruding from the surface of the lower surface of the chaser 1 may be formed, and a grinding reference surface may be formed on the outer peripheral surface of the convex portion (not shown). In addition, the shape of the recesses 7A and 7B or the protrusions not shown extends, for example, a rotationally symmetric shape having an axial center extending in the vertical direction, a polygonal pyramid shape, a polygonal frustum shape, a polygonal column shape, or a horizontal direction. In addition, it is possible to select from a concave groove or a ridge having a trapezoidal shape, a triangular shape, a rectangular shape, an arc shape, or a curved shape in a cross section orthogonal to the extending direction.

Next, a method for grinding the surfaces of the attachment reference surfaces 6a and 6b will be described. As shown in FIG. 6, the chaser 1 is nipped and chucked between the clamp rods 21, 22 facing each other in the thickness direction of the chaser 1. Here, the tip of the clamp rod 21 on the lower surface side of the chaser 1 on the right side in FIG. 6 is fitted and engaged with the first recess 7A and the second recess 7B, respectively, to position the chaser 1 and on the upper surface side. A hemispherical first engaging portion 21a and a second engaging portion 21b that are pressed toward each other are provided. The hemispherical surface of the first engaging portion 21a that fits into the first concave portion 7A is in line contact with the grinding reference surface 7a of the first concave portion 7A over the entire circumference on one circumference centered on the axis P1. Thus, the first recess 7A is positioned on the same axis. In order to prevent rotation of the chaser 1 around the first engagement portion 21a and to position the rotation direction, the hemispherical surface of the second engagement portion 21b that fits into the second recess 7B made of a groove is The second recess 7B is positioned on the same axis by contacting the grinding reference surface 7b of the second recess 7B with two points at symmetrical positions with respect to the center line CL1. In this way, in the chaser 1, one attachment reference surface 6 a is parallel to a straight line connecting the axes of the first engagement portion 21 a and the second engagement portion 21 b of the clamp rod 21, and the other attachment surface The reference surface 6b is positioned so as to be perpendicular to the straight line. In addition, about the 2nd engaging part 21b fitted to the 2nd recessed part 7B which consists of a ditch | groove, the cross section orthogonal to the longitudinal direction of the said ditch | groove makes the circular arc shape which contacts the grinding reference plane 7b at two places, and the said long You may make it extend so that engagement with the said grinding | polishing reference surface 7b over the predetermined length of a direction is possible.

Although not shown, the shape of the engaging portion of the clamp rod can be changed according to the shape of the concave portion or the convex portion. That is, the engaging portion of the clamp rod may be formed to engage with the inner wall surface of the concave portion or the outer peripheral surface of the convex portion in at least one contact state among surface contact, line contact, and point contact. When the inner wall surface or the outer peripheral surface is formed in parallel with the vertical line, for example, the concave portion or the convex portion is cylindrical or polygonal, the fitting convex portion or concave portion corresponding to these shapes is the clamp rod. It is formed in the engaging part. On the other hand, the concave portion or the convex portion has a conical shape, a truncated cone shape, a polygonal pyramid shape, a polygonal frustum shape, or a spherical shape, or a trapezoidal shape and a triangular shape in a cross section extending in the horizontal direction and orthogonal to the extending direction In the case where the inner wall surface or the outer peripheral surface is inclined so as to form an acute angle with respect to the vertical line, such as a rectangular groove, a circular arc shape or a curved groove or protrusion, as in this embodiment In addition, the engagement portion of the clamp rod is formed so as to engage with the inner wall surface of the concave portion or the convex portion or the outer peripheral surface of the convex portion in a point contact or line contact state. In particular, when the inner wall surface or the outer peripheral surface is engaged with the engagement portion at a plurality of points, a plurality of arcs, or the entire circumference on one circumference around the axis of the engagement portion, Since the center of the concave portion or the convex portion is centered on the axis of the engaging portion, the centripetality is increased and the chucking accuracy is excellent.

At the tip of the clamp rod 22 on the upper surface side of the chaser 1 on the left side of FIG. 6, a pressing portion 22 </ b> A having a flat pressing surface 22 a is provided, and the pressing surface 22 a is substantially at the center of the upper surface of the chaser 1. It abuts the part and presses against the seating surface 3 side. In order to stably chuck the chaser 1, the pressing surface 22 a is as far as possible, more specifically, from the positions of the first engaging portion 21 a and the second engaging portion 21 b of the opposing clamp rod 21. Is preferably formed over the outer area and abuts the upper surface of the chaser 1.

As described above, in the chaser 1, the mounting reference surfaces 6 a and 6 b are press-fired on the basis of the grinding reference surfaces 7 a and 7 b of the recesses 7 A and 7 B that engage with the clamp rod 21 of the chucking device. The material surfaces 6a ′ and 6b ′ are ground using a grinding wheel. Here, each of the mounting reference surfaces 6a and 6b is ground to a predetermined height dimension H2 and a predetermined width dimension W2 from the axis P1 of the first recess 7A, whereby the cutting blade 5 The reference point 5d is dimensioned with high accuracy from the ground mounting reference surfaces 6a, 6b to a predetermined height H and width W. Considering that the dimensional accuracy of the reference point 5d with reference to the mounting reference surfaces 6a and 6b is further increased, at least the flank 4 connected to the finishing blade 5c is used with reference to the ground mounting reference surfaces 6a and 6b. It can also be ground.

When the flank 4 is not ground, the reference point 5d of the cutting edge 5, the first recess 7A and the second recess are considered in consideration of improving the positional accuracy of the reference point 5d with respect to the mounting reference surfaces 6a and 6b. It is desirable to improve the relative positional accuracy of the two by bringing the height 7H close, that is, by reducing the height H1 and the width W1. Specifically, the axis P1 of the first recess 7A is disposed closer to the reference point 5d than the center P of the chaser 1, and the center line CL1 of the second recess 7B passes through the center P of the chaser and the center line It is desirable that it is arranged closer to the reference point 5d than a straight line parallel to CL1.

In consideration of increasing the dimensional accuracy of the chaser 1 in the thickness direction, it is desirable that at least one of the rake face 2 and the seating face 3 is ground. However, since the influence on accuracy is not as great as the height dimension and the width dimension, the above-described grinding process may be omitted.

As shown in FIG. 7, the above-described chaser 1 is seated with its seating surface 3 in contact with the bottom surface of the chip seat 11 of the die head 10, and the mounting reference surfaces 6 a and 6 b respectively correspond to the chip seat 11 corresponding thereto. In a state where the restraining wall surfaces 11a and 11b are in contact with each other, one presser foot 12A presses the upper surface of the chaser 1 toward the bottom surface of the chip seat 11, and the other presser foot 12B has a side surface that faces the side surface of the chaser 1. The chip seat 11 is clamped to the tip seat 11 by being pressed toward the constraining wall surface 11b of the tip seat 11 to be abutted. Since the chaser 1 is positioned on the chip seat 11 with reference to the mounting reference surfaces 6a and 6b, the reference point 5d of the cutting blade 5 is positioned with high accuracy when clamped on the die head 10. Since the first recess 7A and the second recess 7B do not contact the bottom surface of the chip seat 11 when the chaser 1 is seated on the chip seat 11, the bottom surface of the chip seat 11 is flat like a general chip. What is necessary is just to comprise by a surface. Although not shown, when a chaser provided with a convex portion protruding from the lower surface is seated on the bottom surface of the chip seat, there is a recess in which the convex portion can be loosely inserted to abut against the bottom surface with the lower surface serving as a seating surface. Provided. Alternatively, when the convex portion is provided over a wide range so as to be close to the peripheral portion of the lower surface of the chaser, or provided in at least three places close to the peripheral portion of the lower surface, the seat can be functioned as a seating surface. It is also possible to use the end surface of the convex portion that faces vertically downward as a seating surface.

(A) of FIG. 7 has shown the oil well pipe rotary processing form to which the die head 10 was fixed. That is, the die head 10 is given a relative feed of 1 pitch per rotation to the oil well pipe 30 rotating around the axis, and cuts a thread on the outer peripheral surface 31 at the end of the oil well pipe 30. Go. On the other hand, FIG. 7B shows an oil well tube-fixed processing form in which the fixed oil well tube 30 is fixed. That is, the three heads 1A, 1B, and 1C are provided on a die head (not shown) with a cutting edge 5 projecting inward from the inner peripheral surface of the die head and spaced along the circumferential direction of the inner peripheral surface. Is arranged. The die head arranged concentrically with the axis of the oil well pipe 30 is given a relative feed of one pitch per rotation with respect to the oil well pipe 30 while rotating around the axis, whereby the oil well pipe 30 The thread is cut on the outer peripheral surface 31 at the end of the head. Whether the shapes of the cutting blades 5 of the individual chaser 1A, 1B, and 1C are the same or different can be selected as appropriate. The number of the chaser 1 may be one or plural. In any of the above-described processing forms, the thread is processed by providing a relative rotational motion and a feed motion between the die head 10 and the oil well pipe 30. Which processing form is selected is arbitrary.

According to the chaser 1 of the present embodiment, the surfaces of the attachment reference surfaces 6a and 6b are ground with reference to the grinding reference surfaces 7a and 7b, and therefore, the reference point 5d of the cutting blade 5 from these attachment reference surfaces 6a and 6b. Therefore, the positioning accuracy of the cutting blade 5 is improved when the chaser 1 is clamped to the die head 10. Since it is not necessary to grind the cutting blade 5 with high accuracy, the time required for grinding can be shortened, and the mass productivity of the chip 1 is improved. In particular, in the case of the one having the thread cutting edge 5 as in the case of the present embodiment, the grinding of the flank 4 using a profile grinder or a total grinding wheel is omitted, so that mass productivity is extremely high. Processing cost is reduced.

By grinding the flank 4 of the finishing blade 5c that affects the accuracy of the thread of the oil well pipe with reference to the ground mounting reference surfaces 6a and 6b, the dimensional accuracy of the chaser 1 and the cutting edge in the die head 10 can be obtained. The positioning accuracy of 5 is further improved. Moreover, since the variation in the grinding allowance removed in the grinding process of the mounting reference surfaces 6a and 6b and the flank 4 is reduced, the processing accuracy is improved by uniformizing the grinding resistance during the grinding process, and the time required for the grinding process is reduced. Cost reduction and further improvement in economic efficiency can be realized by downsizing the press firing material.

The combination of the shapes of the recesses 7A and 7B is not limited to that described above, but a combination of two truncated cone shapes shown in FIG. 4A, or 2 shown in FIG. 4B. A combination of two square holes, or a combination of two grooves that are orthogonal to each other so as to form a cross shape or a T shape as shown in FIGS. Although not shown, the recesses 7A and 7B may be provided only on the upper surface where the rake face is formed. In these modified examples, the same action as the grinding reference surface described in the previous embodiment can be obtained.

The shape of the cutting blade 5 can be applied to cutting blades having various shapes in order to perform predetermined or appropriate processing on various workpieces, regardless of the thread cutting blade described in the present embodiment. It goes without saying that the configuration can be changed and added without departing from the gist of the present invention.

It is a top view of the chaser which is an embodiment. It is a bottom view of the chaser shown in FIG. 3 is a sectional view taken along line S1-S1 and a sectional view taken along line S2-S2 in FIG. (A) And (b) is a figure which shows the modification of this embodiment, and is a figure equivalent to FIG. (A) And (b) is a figure which shows the modification of this embodiment, and is a figure equivalent to FIG. It is a figure which shows the state which chucked the chaser shown in FIG. 1 with the chucking apparatus, and is a figure equivalent to FIG. It is the figure which showed typically the state which processes a thread on the outer peripheral surface of the edge part of an oil well pipe using the chaser shown in FIG. It is a bottom side perspective view showing a conventional chip. It is a side view of the chucking state by the chucking apparatus of a grinding machine.

Explanation of symbols

1 Cheser (chip)
2 Rake face 3 Seating face 4 Relief face 5 Cutting edges 6a, 6b Reference mounting surface 6a ', 6b' Reference mounting surface (press fired material surface)
7A 1st recessed part (recessed part)
7B Second recess (recess)
7a, 7b Grinding reference surface 10 Die head 11 Chip seat 11a, 11b Restraining wall surface 21, 22 of clamp seat Clamp rod 21a, 21b Clamp rod engagement portion

Claims (6)

A cutting blade is formed on at least one ridge side portion of the ridge side portion that includes the upper surface, the lower surface, and a plurality of side surfaces, and the rake surface is formed on the upper surface extending from the cutting blade. In addition, in the throw-away tip, a flank is formed on a side surface extending from the cutting blade, and further, an attachment reference surface for positioning the cutting blade at a predetermined position is formed on at least one side surface.
A concave portion or a protruding convex portion that is recessed from at least one of the upper surface and the lower surface is formed, and the grinding is performed on the inner wall surface of the concave portion or the outer peripheral surface of the convex portion when the mounting reference surface is ground. A throw-away tip characterized in that a grinding reference surface serving as a processing standard is formed. 2. The throw-away tip according to claim 1, wherein all or a part of the flank formed on the side surface extending from the cutting edge is constituted by a press-fired sintered surface. In a cross section perpendicular to the extending direction while the recess or projection has a rotationally symmetric shape having an axis extending in the vertical direction, a polygonal pyramid shape, a polygonal frustum shape or a polygonal column shape, or a horizontal direction. It is at least one shape selected from trapezoidal, triangular, rectangular, arcuate or curved grooves or ridges, and the inner wall surface of the recess or the outer peripheral surface of the protrusion is the grinding reference surface The throw-away tip according to claim 1 or 2, wherein The throw-away tip according to any one of claims 1 to 3, wherein the cutting blade includes at least one screw cutting blade for threading. A cutting blade is formed on at least one ridge side portion of the ridge side portions where the upper surface and the side surface intersect with each other, and a rake face is formed on the upper surface extending from the cutting blade. In the grinding method of the throw-away tip, a relief surface is formed on a side surface extending from the cutting edge, and further, an attachment reference surface for positioning the cutting edge at a predetermined position is formed on at least one side surface.
The mounting reference surface is ground on the basis of a grinding reference surface formed on the inner wall surface of the recess recessed from the surface of the upper or lower surface of the throwaway tip or the outer peripheral surface of the protruding protrusion. How to grind throwaway inserts. A cutting blade is formed on at least one ridge side portion of the ridge side portions where the upper surface and the side surface intersect with each other, and a rake face is formed on the upper surface extending from the cutting blade. In the grinding method of the throw-away tip, a relief surface is formed on a side surface extending from the cutting edge, and further, an attachment reference surface for positioning the cutting edge at a predetermined position is formed on at least one side surface.
The mounting reference surface is ground and ground with reference to the grinding reference surface formed on the inner wall surface of the recess recessed from the surface of the upper or lower surface of the throw-away tip or the outer peripheral surface of the protruding protrusion. A throwaway tip grinding method comprising grinding all or a part of the flank with reference to the mounting reference surface.

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