KR910004533Y1 - Cutting tool - Google Patents

Abstract

No content.

Description

Slow-away type tool

1 is a front view of a conventional tip.

2 is a view of the tip seen from the direction of arrow II in FIG.

3 is a view of the tip seen from the arrow III direction in FIG.

4 is a front view of a conventional slow-away type tool.

5 is a side view of the tool of FIG.

6 is a cross-sectional view of the tool of FIG.

FIG. 7 is an enlarged view of a circle (circle) indicated by arrow VII in FIG.

FIG. 8 is a cross-sectional schematic diagram of a workpiece showing a surface machined as a tool of FIG. 4. FIG.

9 is a fragmentary front elevational view of another conventional slow-away cutting tool.

10 is a cross-sectional view of the tool of FIG.

FIG. 11 is an exploded view of the tool of FIG. 9 showing the placement of an attached tip.

12 is an enlarged view of a circle indicated by arrow XII in FIG. 10;

FIG. 13 is a multi-sided schematic diagram of a workpiece showing a surface machined as a tool of FIG. 9;

14 is a cross-sectional view of another conventional turning tool.

15 is a side view of the tool of FIG.

FIG. 16 is a front view of the tool of FIG. 14 showing the placement of the tip. FIG.

17 is a side view of the tool of FIG. 16;

18 is a front view of a slowaway type turning tool according to the first embodiment of the present invention.

19 is a side view of the tool of FIG. 18;

20 is a cross-sectional view of the tool of FIG. 18.

21 is a front view of the tip used in the tool of FIG. 18;

FIG. 22 is a view of the tip of FIG. 21 as seen from arrow XII of FIG. 18;

FIG. 23 is a view of the tip of FIG. 21 as viewed in the XXIII direction of FIG. 18;

24 is an enlarged view of a circle indicated by arrow XIV in FIG. 20;

25 is a schematic cross-sectional view of a workpiece and shows a surface machined as a tool of FIG. 18;

FIG. 26 is a front view showing a modification of the tip used as the tool of FIG. 18; FIG.

FIG. 27 is a view of the tip as seen from the arrow 의 of FIG. 26;

FIG. 28 is a view of the tip as seen from the arrow 의 of FIG. 26;

29 is a front view of a slowaway type turning tool according to a second embodiment of the present invention;

30 is a side view of the tool of FIG. 29;

31 is a cross sectional view of the tool of FIG. 29;

32 is a partially broken front view of a slowaway type turning tool according to a third embodiment of the present invention;

33 is a sectional view of the tool of FIG. 32;

34 is an exploded view of the tool of FIG. 32;

35 is a view similar to FIG. 34 showing a tool according to the fourth embodiment of the present invention.

36 is a view similar to FIG. 34 showing a tool according to a fifth embodiment of the present invention.

37 is a cross-sectional view showing a slow-wearing turning tool according to a sixth embodiment of the present invention.

38 is a side view of the tool of FIG. 37;

FIG. 39 is a front view of the tool of FIG. 37 showing the placement of the tip. FIG.

40 is a side view of the tool of FIG. 39;

FIG. 41 is a front view of a slowaway type turning tool according to a seventh embodiment of the present invention;

42 is a side view of the tool of FIG. 41;

43 is a cross sectional view of the tool of FIG. 41;

* Explanation of symbols for main parts of the drawings

10: cutting tool 12: tool body

14: tip 20: pocket

22: Element 24: Tips

30: front 32: rear

34: side 36: main cutting edge

38: rake surface 42: edge cutting edge

A: axial rake angle B: relief angle

C: corner angle S: machining surface

X: Axis W: Workpiece

The present invention relates to a slow-away type turning tool attached to the outer periphery of the tool body to hold a positive inclined surface in the axial direction.

Among the recent slowaway tips, a slow-away tipping tool has been developed, in particular having a square plate shape and a pair of sides acting as a rake surface for the main cutting edge and having such a tip. Has been used in end mills, side milling machines, and front milling machines.

Such a tip and some of the tipping tools holding the tip are shown in FIGS. 1 to 17 of the accompanying drawings in which the same or the same shaped members are indicated by the same reference numerals.

The tip 100 shown in FIGS. 1 to 3 has a substantially parallelogram determined by the front face 102 and the back face 104 and the four side faces 106 disposed substantially parallel to the front face 102. It is shaped like a plate.

The tip 100 has a pair of major cutting edges 108 defined by the front face 102 and a pair of both sides 106, each of which has a pair of major cutting edges 108. Is an inclined surface (110).

The inclined surface 110 is flat and inclined inward in a direction away from the front surface 102, and the width between both inclined surfaces 110 of the tip 100 is the rear end at the tip 108a of each major cutting blade 108. It is uniform over the entire length to 108b.

The corners of the tip determined by the front face 102 and the other pair of two sides 106 are formed by rounded round portions 112 and defined by two acute angles intersecting both sides 106. The corners of the diagonally arranged tips are breast-feeding each of the front edges adjacent to the main cutting edge 108 and composed of the edge cutting edge 114, and the edge cutting edges 114 are respectively symmetrical with the main cutting edge 108. Is fulfilling.

The portions adjacent to the edge cutting edge 114 of the other pair of side surfaces 106 are respectively rake surfaces 116 of the edge cutting edge 114.

In the tip 100, an attachment hole 118 is formed through the center.

An example of a cutting tool using the tip 100 described above is shown in FIGS. 4 to 6.

The tool is generally denoted as 120, but is configured as a substantially cylindrical tool body 112, the main body of which is fixedly attached to the machine spindle so that it can rotate about the through axis X.

The tip circumferential surface of the tool body 122 is formed with a pocket 124 and a receiving element 126 of the tip, which element 126 is adjacent to and opens the pocket 124.

The tip 100 is accommodated in the element 126 in a state where the back 104 is seated on the bottom surface, and is attached to the attachment screw 128 inserted in the bottom surface of the element 126 through the attachment hole 118. It is fixed to the element so that disassembly is possible.

One of the main cutting edges 108 and the edge cutting edge 114 adjacent to each of them is divided into the cutting positions, and the main cutting edge 108 of the divided projections faces radially outwardly of the tool body 122. Thus, the protruding edge cutting edge 114 faces the forward direction of the tool body 122.

The arrangement of the tip 100 is carried out at the right angle of the axial inclination angle a (the tool body 122 of the tip 100) as shown in FIG. 5 by the inclined plane 110 with respect to the main cutting edge 108 thereof. The tip end 108a and the rear end 108b of the main cutting edge 108 calculated when the tool main body 122 is rotated about the axis X. Each circle of the same diameter arranged on the same axis 130 is made to draw.

9 to 13, a plurality of for example four pockets 124a are formed on the outer circumferential surface of the tool body 122a at equal intervals in the circumferential direction and the axial direction. It differs from the tool 120 previously described in that it exists.

A plurality of elements 126a are also formed on the outer circumferential surface of the tool body 122a, and each of the elements 126a is adjacent to and open to each one of the pockets 124a.

The same tip 100 as described above is detachably attached to the element 126a so as to overlap the tool body 122 in the circumferential direction as shown in FIG.

One of the major cutting edges 108 of each tip 100 is projected to the outer peripheral cutting position so as to face the radially outer side of the tool body 122 and close to the front end surface of the tool body 122. One of the edge cutting edge 114 of the) is divided into the cross-sectional cutting position so that the tool body 122 faces the axial front.

As shown in FIG. 11, the inclined surface 110 of the main protruding cutting edge 10 of each tip 100 has a right axial inclination angle A and a tool body 122a. The line 108a and the rear end 108b of each major cutting edge 108, which are calculated when is rotated about the axis X, are coaxially disposed on the tool body 122a as shown in FIG. Each circle 130a of the same diameter is drawn.

Another conventional turning tool 120b shown in FIGS. 14 to 17 is a disk-shaped tool body 122b defined by an axial front face 140, an axial back face 142, and an outer circumferential face 144. As is done.

On the outer circumferential surface 144 of the tool body 122b, a plurality of pockets 124b are formed at intervals in the circumferential direction.

On the outer circumferential surface 144 of the tool body 122b, two sets of elements 126b and 126c arranged in a Z-shape are formed, and one set of elements 126b is formed on the other side of the axial front face 140. The elements 126c are respectively open to the axial back surface 142 and the elements 126b and 126c are adjacent to and open to each one of the pockets 124b.

Each of the elements 126b and 126c is provided with the same tip as described above so as to be disassembled, the tip of the element 126b is indicated as 100a and the tip of the element 126c as indicated as 100b.

The tip 100a and the tip 100b are inclined in the reverse circumferential direction with respect to the tool body 122b so that one of the main cutting edges 108 and the corner cutting edge 114 adjacent to the edge are divided into respective working positions. It protrudes and the inclined surface 110 with respect to the main cutting edge 108 has a positive axial inclination A.

As shown in FIG. 16, the protruded main cutting edges 108 of the tips 100a and 100b are disposed so as to overlap when the tool body 122b is seen in the circumferential direction and the tool body 122b is stiffened. The front end 108a and the rear end 108b of the main cutting edge 108 calculated at the time of rotation about (X) are drawn in the circle of the same diameter arrange | positioned coaxially to the tool main body 122b.

If it is desired to obtain better cutting performance in the conventional tools 120, 120a and 120b described above, it is necessary to use the tip 100 designed to have a sufficiently large axial tilt angle A.

However, the tip 100 must be arranged to have a relief angle B with respect to the protruding edge cutting edge 114, so that the tip 100 has a large axial inclination angle A. The corner angle C of the protruding edge cutting edge 114 must be made a substantial acute angle.

As a result, the intensity | strength in the calculated edge cutting edge 114 of the tip 100 fell, and there was a possibility that the tip 100 used may be damaged.

In addition, in addition to the linear shape, the main protrusion 108 of the tip 100 is arranged so that the tip 100 has a positive axial inclination angle A, and the tool body 122, 122a, 122b It is inclined in the circumferential direction.

Accordingly, when the tool body is rotated about the axis X during cutting, the divided protruded main cutting edge 108 of the tip 100 is drawn by the front end 108a and the rear end 108b of the main cutting edge 108. A deformation cylinder with a smaller diameter is drawn in the middle portion between the ends thereof at both ends.

Therefore, when the workpiece W is machined as the tools 120, 120a and 120b described above, the machining surface S becomes convex as shown in Fig. 8 or becomes wavy as shown in Fig. 13 so that the machining precision And unsatisfactory surface finish occurs.

In addition, in the tools 120a and 120b holding the plurality of tips 100, it is difficult to obtain sufficient rigidity due to the large cutting resistance of the tool and the structure of holding the plurality of pockets 124a and 124b.

Therefore, the tool bodies 122a and 122b are cracked or vibration occurs during use.

It is therefore an object of the present invention to provide a slow-away cutting tool with high cutting accuracy without high cutting performance and high cutting edge strength and without cracking or vibration during cutting.

Another object of the present invention is to attach a detachable tip to the above-mentioned electric tool, and to cut a slotaway tip which is particularly preferably used for the tool.

According to a first aspect of the present invention, a cross section having a rotation axis has a substantially circular tool body and one or more slotaway tips detachably attached to an outer circumference of the tool body, the tip being provided at the front and Said pair having a pair of major cutting edges defined by the back and a pair of said two sides defined by the four sides and the back disposed approximately parallel to the front; The side surfaces of the main cutting blades are each inclined surface, and each of the inclined surfaces has a convex shape such that the width of the tip between the inclined surfaces at the center of the main cutting blade is larger than the width at both ends of the main cutting blade. The arrangement of the tip on the tool body with respect to the tip is that one of the main cutting edges is calculated as the working position so that the tool body faces outward in the radial direction and is divided. The slow-away expression jeonsak tool of the main metal, which consists of the inclined face of the cutting edge so as to hold the slope of the positive (正) in the axial direction of the workpiece processing is provided.

According to the second aspect of the present invention, a pair of mains is formed by the front side and the rear side and the front side and the rear side and the front side and the front side and the pair of the two sides, forming a plate shape of a substantially square shape defined by four sides. Both sides of the pair are the inclined surfaces of the main cutting edge, and the width of the tip between the inclined surfaces at the center of the main cutting edge is the width at both ends of the main cutting edge. A convex curved slotaway tip is provided that is made larger.

Various embodiments of the present invention will be described with reference to FIGS. 18 to 43 of the accompanying drawings.

In the drawings, the same reference numerals are assigned to the same parts or the same members.

The slotted-type turning tool according to the first embodiment of the present invention, which is generally indicated by reference numeral 10 in FIGS. 18 to 25, has a substantially circumferentially-oriented tool body having a front end 14 and a rear end ( 12) and a rear end thereof is fixedly attached to the muspins so that the tool body 12 is rotated about the through axis line X in the direction of the arrow R.

The front end 14 has a front end face 16 and an outer circumferential face 18, and the outer circumferential face 18 is formed with a pocket 20 that is opened to the front end face 16 and a receiving element 22 of the tip.

The element 22 is adjacent and open to the pocket 20 and has a radially outwardly facing bottom of the tool body 12.

The element 22 is detachably attached to a slowaway tip 24 made of a hard wear resistant material.

The tip 24 has a flat front surface 30 and a flat rear surface 32 disposed substantially parallel to the front surface 30, as shown in FIGS. It forms the plate shape of the substantially parallelogram determined by it.

The tip 24 has a pair of major cutting edges 36 defined by the front face 30 and a pair of both side faces 34.

The pair of both side surfaces 34 are inclined inward in a direction away from the front surface 30 and are each inclined surface 38 with respect to the main cutting edge 36.

The inclined surface 38 has a convex shape such that the tip width between the inclined surfaces is the smallest at the leading end 36a and the rear end 36b of the major cutting edge 36 and the largest at the central portion 36c of the major cutting edge 36. It has a curved surface.

The round part 40 is formed in the corner part defined by the both side surface 34 which makes a pair with the front surface 30 by the rounding process.

The two sides 34 of the other pair are slightly inclined in a direction falling from the front surface 30, and two diagonally arranged edge portions defined by the two sides 34 intersecting at an acute angle are the major cutting edges 36. ), Each having a leading end portion which acts as an edge cutting edge 42, and the edge blade 42 is paired with the main cutting edge 36, respectively.

The part adjacent to the edge cutting edge 42 of the both sides 34 of the said other phase becomes the rdlief flank 44 of the edge cutting edge 42.

The tip 24 also has a central attachment hole 46 formed therethrough.

The tip 24 is received by the element 22 in a state where the back 32 is seated on the bottom, and is secured to the element 22 by a fixing screw 48 which is screwed to the bottom of the element 22 through the attachment hole 46. Removably fixed to.

One of the main cutting edges 36 and the corner cutting edges 42 adjacent thereto are divided into the circumferential cutting and the surface cutting positions, respectively, and the main cutting edge 36 of the main cutting edge 36 is radially direction of the tool body 12. The horn cutting blade 42 which protrudes outwards and faces outwardly faces the tool body 12 in the axial direction.

The arrangement of the tip 24 is such that the inclined surface 38 with respect to the protruding major cutting edge 36 has an appropriate inclination angle A of the right angle in the axial direction, and the clearance with respect to the protruding edge cutting edge 42. The front end 36a and the rear end of the main cutting edge 36 calculated when the surface 44 has a proper clearance angle B as shown in the 19th degree and the tool body 12 is rotated about the axis X. 36b is made to draw each circle 48 of the same diameter arrange | positioned coaxially in the tool main body 12. As shown in FIG.

In addition, to obtain a good finished surface, the tip 24 has a convex arc-shaped inclined surface 38, and the tip 24 is calculated when the arc rotates the tool body 12 about the axis X. It is preferable that the major cutting edge 36 is arranged on the same axis of the tool body 12 and set to a curvature such that the cylinder 36 has the same diameter as the circle 48 drawn by the leading end 36a and the rear end 36b. .

In the tool 10 described above, when the tip 24 is disposed at the same inclination angle as that of the conventional tool, the tip 24 is formed such that the inclined surface 38 is formed as a convex curved surface. The corner angle C in the cutting edge 42 becomes larger than in the case of a conventional tool.

As a result, the cutting edge strength of the tip 24 is greatly increased such that the tip is not subject to defects or excessive wear and thus the surface of the tip 24 is extended.

In addition, since the inclined surface 38 is a convex curved surface, the cutting chip generated during cutting is smoothly removed along the inclined surface 38, so that the cutting resistance is reduced and the tool body 12 is not cracked or vibrated.

Since the thickness of the chip generated by the tool 10 described above is thinner than the thickness of the chip generated by the conventional tool, the chipped chips are divided into sizes that can be easily and smoothly raised.

In addition, since the main cutting edge 36 is convexly curved at the tip 24, a cylinder having a substantially uniform diameter is drawn when the tool body 12 is rotated about the axis X. FIG.

Therefore, when the workpiece W is processed as the tool 10 to form the groove G as shown in FIG. 25, the opposing wall surfaces of the grooves cut as the main cutting edge 36 are substantially flat and parallel to each other. Machining precision and finishing surface are greatly improved compared to the conventional tools.

In particular, when the inclined surface 38 forms a convex arc surface of curvature as described above, the processing surface S is precise and flat as shown in FIG. 25 so that the processing precision and the finished surface are further improved.

26 to 28 show a variation of the tip 24a used for the tool 10 described above, which differs from the tip 24 described above in that the tip 24a is approximately rhombic.

Also in this tip 24a, the pair of both side surfaces 34, which are composed of the inclined surfaces 38 of the main cutting blades 36, are convex curved surfaces, and preferably convex circular arc surfaces having a predetermined curvature.

29 to 31 show a turning tool 10a according to the second embodiment of the present invention.

The tool 10a is different from the tool 10 described above in that the outer peripheral surface of the distal end of the tool body 12a is formed with a plurality of, for example, three pockets 20a at equal intervals in the circumferential direction.

A plurality of elements 22a are further formed on the outer circumferential surface of the tip portion, and each element 22a is adjacent to and opened in each one of the pockets 20a.

In each element 22a, the same parallelogram-shaped tip 24 as in the first embodiment is detachably provided and arranged to act on a common outer circumference.

One of the major cutting edges 36 of each tip 24 faces the radially outer side of the tool body 12a and is divided into the cutting positions so that one of the edge cutting edges 42 of each tip 24 is the tool body. The part 12 is projected to the cutting position facing the front side in the axial direction.

32 to 34 show the turning tool 10b according to the third embodiment of the present invention, the tool having a plurality of, for example, four pockets 20b on the outer peripheral surface of the tip of the tool body 12b in the same direction and along the axis. The tool 10 is different from the first embodiment in that it is provided at equal intervals in the direction.

On the outer circumferential surface of the tool body 12b, a plurality of elements 22b are formed, each of the elements 22b is formed, and each of the elements 22b is adjacent to and open to each one of the jacket 20b.

The element 22b is provided with the above-mentioned lozenge tips 24a, respectively, and is arrange | positioned so that it may overlap as shown in FIG. 32, when the tool body 12b is seen circumferentially.

One of the major cutting edges 36 of each tip 24a is projected into the circumferential cutting position so as to face radially outward of the tool body 12b, so that the tip 24a closest to the front end surface of the tool body 12b. The edge cutting edge 42 of the edge is divided into the cross-sectional cutting position so as to face the tool body 12b in the axial direction forward.

In the tool 10b, when the tool body 12b is rotated about the axis X, the partly projected main cutting edge 36 of the tip 24a is roughly arranged on the same axis of the tool body 12b. Draw a cylinder of uniform diameter.

35 shows a turning tool 10c according to the fourth embodiment of the present invention.

On the outer circumferential surface of the tool body 12c, a plurality of, for example, four pockets 20c are provided at equal intervals in the same direction.

Four sets of elements 22c are formed on the outer circumferential surface of the tool body 12c, and each set is opened adjacent to each one of the pockets 20c.

The elements 22c of each pair are spaced apart from each other in the axial direction slightly apart in the circumferential direction.

The lozenge tip 24a is detachably provided in each element 22c, and is arrange | positioned so that the tool body 12c may overlap when it sees from the same direction.

One of the major cutting edges 36 of each tip 24a is dividedly projected to the circumferential cutting position so that one of the edges 42 of each of the two tips 24a closest to the distal end surface of the tool body 12c. Is partly projected to the section cutting position.

All tips 24a are arranged to have a right angle of inclination A in the axial direction.

3b shows a turning tool 10d according to the fifth embodiment of the present invention.

The tool 10d has the tool 10c in the fourth embodiment in that the tip 24d closest to the distal end surface of the tool body 12c has an axial inclination angle A ₁ smaller than the remaining tip 24a. )

The axial inclination angle A ₁ of the two tips 24b must be determined in consideration of the clearance angle B of the divided protruding edge cutting edge 42, but the inclination angle A of the remaining tips 24a is It can be selected without considering the clearance angle of the edge cutting edge.

Therefore, in order to obtain good cutting performance, the angle of inclination A with respect to the latter tip 24a is divided into two adjacent axial directions with the axial length L ₁ of each tip 24a circumferentially away from the tip 24a. The spacing L2 is selected to be larger than the spacing L ₂ between the spaced apart tips 24a. As a result, when the tool body 12c is viewed in the circumferential direction, it can be made larger in the overlapping range.

37 to 40 show the turning tool 10e according to the sixth embodiment of the present invention, the tool having an outer circumferential surface 54 between the axial front face 50 and the rear face 52 and their faces. The disk-shaped tool body 12e determined by this is provided.

On the outer circumferential surface 54 of the tool body 12e, a plurality of pockets 20e are formed at equal intervals in the circumferential direction.

In addition, the outer circumferential surface 54 is formed with Z-shaped elements 22e and 22f of the first and second jaw, and the element 22e of the first jaw is an element of the second jaw on the front surface 50. 22f is opened in the upper surface 52, and each of the elements is adjacent to and opened in each one of the pockets 20e.

The parallelogram tip is detachably attached to the above-described elements 22e and 22f, and the tip disposed in the element 22e of the first article is 24e and the tip in the element 22f of the second article is 24f. Is displayed.

The tip 24e and the tip 24f are inclined in opposite circumferential directions with respect to the tool body 12e, and one of the main cutting edges 36 of each tip and the corner cutting edge 42 adjacent thereto are acting positions. The take surface 38 with respect to the main cutting edge 36, which has been projected into and divided into the projections 36, has a positive axis tilt angle A. As shown in FIG.

The tips 24e and 24f are arranged to overlap with the 39th degree when the tool body 12e is viewed in the circumferential direction, and the main cutting edge 36 of the tip is the tool body when the tool body 12e is rotated. It is supposed to draw a cylinder coaxial with (12e).

41 to 43 show the electric tool 10 according to the seventh embodiment of the present invention, wherein the tool body 12f of the tool has a circular disk-shaped section having a circular cross section formed at the front end thereof; The base 60 is provided.

The base 60 has an axial front face 62 and a back face 64 and an outer circumferential face 66 between these faces.

On the outer circumferential surface 66 of the base 60, a plurality of pockets 20g and elements 22g are formed, and a plurality of parallelogram tips 24 are disposed on the elements 22g, respectively.

The arrangement of the pocket 20g, the element 22g and the base 60 of the tip 24 is basically the same as that of the tool body 12e in the turning tool 10e of the sixth embodiment.

The tool 10f is used to form a T groove or the like on the workpiece.

In the tools according to the second to seventh embodiments, when the tip is disposed as the same attachment inclination angle as in the conventional tool, the tip is formed so that the inclined surface becomes convex, so that the corner angle at the edge cutting edge of the tip This becomes larger than in the case of the conventional tool.

As a result, the tip has a significant increase in cutting edge strength and the tip does not suffer from defects or excessive wear, prolonging the working surface of the tip.

In addition, since the inclined surface forms a convex surface, and the thickness of the cutting chip generated by the tool of the embodiment is thinner than that of the cutting chip generated by the conventional tool, the chip generated during cutting is divided into an appropriate size and thus along the inclined surface. It is removed smoothly, which reduces cutting force and makes the tool body cracked or difficult to vibrate.

This is especially true for tools that have a plurality of tips that are susceptible to cracking or vibration.

In addition, since the main cutting edge of the tip is convexly curved, a cylinder of approximately uniform diameter is drawn when the tool body is rotated about its axis.

Therefore, when the workpiece is processed as a tool and the grooves and the like are closed, the surface cut by the main cutting edge becomes substantially flat, and the machining precision and the finished surface are greatly improved compared to the conventional tools.

Modifications and variations of the present invention are possible in light of the above.

Therefore, you may implement as another form differing from what was demonstrated in this invention in a claim.

Claims (9)

A tool body 12 having a substantially circular cross section having a rotating shaft and one or more slotaway tips 24 are detachably installed on the outer circumference of the tool body 12, and the tip 24 has a front surface 30. ), And the tip 24 is paired with the front surface 30 as described above, in the form of a substantially rectangular plate defined by the back surface 32 and the four side surfaces 34 disposed substantially parallel to the front surface 30. A pair of main cutting edges 36 defined by the above-mentioned both side surfaces 34 of the pair of both side surfaces 34 and each of the rake surfaces 38 of the main cutting edge 36 described above. In each of the inclined surfaces 38, the width of the tip between the inclined surfaces 38 in the center portion 36c of the main cutting blade 36 is larger than at both ends of the main cutting blade 36. The convex curved surface is arranged so that the arrangement of the tip 24 with respect to the tool body 12 is divided into one of the main cutting edges 36. It protrudes to face radially outward of the tool body 12, and the inclined surface 38 for the divided protruding main cutting edge 36 is for machining a metal workpiece which is configured to hold a right angle rake in the axial direction. Slow-away grinding tool. The rake surface (38) of the tip (24) is characterized in that the split-projected main cutting edge (36) of the tool when the tool body (12) is rotated about its axis of rotation. A slow-away type grinding tool characterized by forming a convex circular arc surface of curvature such that a cylinder of coaxial axis is drawn on the main body (12). The method of claim 1, wherein the plurality of said tip (24) is provided at equal intervals in the circumferential direction at the outer circumferential portion of the tool body (12a) to act in a common outer circumferential line. tool. 2. The main cutting blade (10) according to claim 1, wherein a plurality of the tips (24) are provided at the outer circumference of the tool body (12a) at intervals in the circumferential direction and the axial direction. A slow-away type electric tool, characterized in that 36 is connected in the axial direction of the tool body (12b) when viewed in the circumferential direction of the tool body (12b). 5. A tip according to claim 4, wherein one of the tips (24b) closest to the distal end surface of the tool body (12c) is arranged to have an axial inclination angle (A ₁ ) of a smaller angle than that of the remaining tips (24a). Slow-type grinding tool. 2. The tool body (12) according to claim 1, wherein the tool body (12e) has a disk shape defined by an axial front face (50) and an axial back face (52) and an outer circumferential face (54) between them. (24e) (24f) is provided in a Z-shape on the outer peripheral portion of the tool body (12e) described above are disposed adjacent to each other on the axial front surface 50 and the axial rear surface 52 and adjacent to the axial front surface (50) A tip-away tool, characterized in that the tip 24f and the tip 24f adjacent to the rear surface 52 in the axial direction are inclined in opposite circumferential directions with respect to the tool body 12e. The tip surface 24 is divided according to claim 3, 4, 5 or 6, in which the inclined surface 38 of each tip 24 rotates the tool body 12 about the axis of rotation. Slow-type cutting tool, characterized in that the main cutting edge 36 is cooperating to form a curved convex arc surface to draw a cylinder of the same axis on the tool body (12). 7. The tip 24 according to claim 1, 2, 3, 4, 5 and 6, wherein the tip 24 has a central attachment hole 46 penetrating in the thickness direction thereof and is attached thereto. A slow-away type turning tool, characterized in that attached directly to the outer peripheral portion of the tool body 12 by a fixing screw 48 screwed to the tool body 12 through (46). 9. The pocket (20) according to claim 8, wherein the outer periphery of the tool body (12) is formed with an element (22) for receiving each of said tips (24) and said element (22) is disposed adjacently and opened. And the tip (24) is disposed on the element (22) with the rear face (32) seated on the bottom surface of the element (22).