KR101463992B1 - Cutting insert - Google Patents

Abstract

A cutting insert is provided to extend the life span of the cutting insert by securely removing swarf when the cutting insert is fed in a traverse direction to form a groove or a hole. A cutting insert comprises an insert body(1) having a shaft shape and a cutting blade section(2) formed at an end of the insert body. The cutting blade section has a rectangular flank surface(5). The flank surface is provided with a pair of transverse cutting blades(3) that extend lengthwise along the insert body, a front cutting blade(4) extending between the transverse cutting blades in a cross direction to the insert body, a pair of protrusions(11) extending toward a corner(6) at which the transverse cutting blade crosses the front cutting blade, and projections(12) spaced apart from the protrusions.

Description

CUTTING INSERT

The present invention relates to a cutting insert used for forming and cutting a workpiece in turning.

The present application claims priority to Japanese Patent Application No. 2007-091952, No. 2007-094884, filed on March 30, 2007, and Japanese Patent Application No. 2008-012974, filed on January 23, 2008 And its contents are used here.

For example, Japanese Laid-Open Patent Publication No. 9-174308 discloses a cutting insert used for forming or cutting a groove of this kind, including a pair of slits extending in a substantially longitudinal direction on the top face of a cutting head, And a pair of bars (rods) which are coordinated to be contained in the potential pit portion between the bent line and the main cutting edge, And pushing the chip with the vicinity of the contact point of the bend line and the slit as a squeegee point.

In the cutting insert disclosed in Japanese Patent Application Laid-Open No. 9-174308, the pair of bars are disposed in the vicinity of the inner surface facing both slits, while the two slits extend in the vertical direction, That is, the front cutting edge and the positioning cutting edge, that is, the transverse cutting edge, extend away from each other toward the corner where the intersection intersects.

However, in the cutting insert disclosed in Japanese Laid-Open Patent Publication No. 9-174308, the cutting insert is sent in the longitudinal direction to perform the groove forming work on the workpiece by the main cutting edge potion, and then the insert is moved in the lateral direction And the groove is widened by the positioning cutting edge, the cutting debris generated at the corner portion of the positioning cutting edge totally collides with the leading end portion continuous to the bobbin. For this reason, in such a case, there is a fear that the cutting resistance is increased or clogging of the cutting chips is caused and smooth cutting debris treatment can not be achieved.

Also, in the groove forming or cutting work of such a work material, a cutting oil (coolant) is normally supplied toward the cutting portion where the cutting edge is cut into the workpiece to lubricate and cool the workpiece. Is supplied from the rear face side of the insert toward the top face of the cutting head, that is, the flank face, so that the supply to the cutting position is not disturbed by the outflowing cutting debris.

However, in the cutting insert disclosed in Japanese Patent Application Laid-Open No. 9-174308, since the tip portion of the slit extending in the longitudinal direction is continuously formed to extend toward the corner portion as described above, The cutting oil supplied through the positioning cutting edge and supplied to the tip side is only guided by the tip end of the blob and flows out to the positioning cutting blade side. Therefore, it is not possible to sufficiently supply the cutting oil on the side of the corner of the main potion, particularly the corner, and it is easy for the cutting edge in the corner to be damaged by heat or welding depending on the work material, There is a possibility that the accuracy and the quality of the cut surface are also impaired.

On the other hand, in the case where the cutting insert is moved in the longitudinal direction so that only the groove forming or cutting operation of the workpiece is carried out only by the main cutting edge potion, the cutting debris generated by the main cutting edge potential collides with the pair of bars, When the cutting debris continuously contacts with the breaker pit in this way, the bar is abraded and its height is lowered, and then it is worn down and disappeared. Therefore, since the cutting debris can not be controlled by the wear of this bar, the life of the cutting insert is shortened to a short life, and the cutting debris control becomes unstable even in the process of lowering the bar. .

The present invention has been made under the circumstances described above and it is an object of the present invention to provide a cutting insert which is used for forming a groove of a workpiece or cutting a workpiece as described above and can reliably supply the cutting oil to the corner portion of the front cutting edge, It is possible to prevent fusion and adhesion and to improve the precision and quality of the groove wall surface or the cut surface of the workpiece and to increase the cutting resistance even when the groove is widened by feeding the insert in the transverse direction at the time of groove machining It is possible to provide a cutting debris insert capable of performing smooth cutting debris processing and capable of always maintaining control of cutting debris and extending the insert life when the insert is used for forming and cutting grooves only in the lateral direction The purpose is to do.

 In order to achieve the above object, according to the present invention, there is provided a cutting insert having an insert main body having a shaft shape, wherein a cutting edge portion having a rectangular flank surface is formed at an end of the insert main body, A pair of transverse cutting edges extending in the longitudinal direction of the insert body on the flank surface; A front cutting edge extending between the front ends of the transverse cutting edges and extending in a direction crossing the longitudinal direction; A pair of protrusions extending toward the corners where the respective transverse cutting edges and the front cutting edges intersect; Protrusions protruding from the protrusions at intervals between the corner portions of the protrusions on the side of the corner portions and the respective corner portions; Respectively.

In such a cutting insert, first of all, with respect to a pair of protruding portions each extending toward the corner portion where the pair of side cutting edges and the front cutting edge cross each other, the tip portion of the protruding portion on the side of the corner portion and the corner portion The protrusions are formed so as to be spaced apart from each other. Therefore, the cutting oil that has passed between the pair of protrusions and the transverse cutting edge of the flank surface and supplied to the tip side passes through the portion between the protruding portion and the tip portion of the protruding portion, . Therefore, it is possible to sufficiently supply cutting oil to the corner portion of the front cutting edge so as to achieve lubrication and cooling.

Since the protrusions are formed at intervals from the front end of the protrusions in this manner, when machining to widen the groove width as described above is performed, the cutting debris generated at the corner portion of the transverse cutting edge, And there is no case where these protrusions or protrusions collide with each other. Therefore, the whole is not subjected to a resistance, and therefore the cutting resistance can be reduced even on the cutting insert side. On the other hand, the cutting debris that is spaced in this manner and collides with the tip end portion of the projection is curled in the outflow direction while being bent out in the width direction. Therefore, it is easy to be easily divided, and it becomes possible for the resistance received by the cutting debris to be at least smooth and to urge reliable cutting debris treatment.

In the case where only the groove forming or cutting work of the workpiece is performed by sending the insert body in the longitudinal direction, that is, in the longitudinal direction, the cutting debris generated by the front cutting edge collides with only the tip end of the pair of projections, It is strongly rolled in the width direction by the contact and is easily treated to be divided. However, since the projecting portion extends on the flank surface with a certain length to extend toward the corner portion as described above, even if the cutting debris is worn due to the sliding contact, the projecting portion is not worn or lost. Further, if the projecting height at the tip end of the projection is made constant, there is no case where the height is changed by the abrasion, so that it is possible to achieve stable and smooth cutting debris processing.

The projecting portion may be, for example, a structure in which there is no directionality that protrudes in the shape of a sphere, a cone, or a truncated cone between the tip of the corner portion of the projection and the corner. In the case where the protrusion is formed so as to extend from the tip end of the protrusion toward the corner, in the case of machining to increase the groove width by sending the insert in the lateral direction as described above, the cutting The debris can be guided to the rear end side of the cutting edge portion by the projection. Therefore, it is possible to prevent such a situation that such cut-off chips are brought into contact with the bottom surface of the processed groove and scratches.

However, in the case where the protrusion is formed so as to extend from the tip end of the protrusion to the corner, as viewed from the direction perpendicular to the longitudinal direction, the protrusion is located at 15 Deg.] To 75 [deg.]. That is, when the angle is smaller than the range, there is a possibility that the above-mentioned cutting debris can not be reliably guided to the rear end side of the cutting edge portion. On the other hand, if the angle is larger than the above range, It is difficult to guide the cutting debris stably and the early protrusion of the protrusions may be caused.

Particularly, in forming the protrusion so as to extend from the distal end of the protrusion toward the corner, the protrusion may be formed to extend continuously. A plurality of protrusions are formed at intervals between the front end portion of each of the protrusions and the corner portion so that the plurality of protrusions extend discontinuously from the distal end portion of the protrusion toward the corner portion, The cutting oil can be supplied to the front cutting edge side, and more efficient lubrication and cooling can be achieved.

As described above, according to the cutting insert of the present invention, it is possible to reliably supply cutting oil to the corner portion of the front cutting edge to perform lubrication and cooling when groove forming or cutting processing of the workpiece is performed, It is possible to prevent damage due to heat or welding and to prolong the life of the insert. In addition, it is possible to prevent the accuracy or the quality of the groove wall surface or the cut surface of the workpiece from being damaged by such heat damage or welding. On the other hand, even when the groove width is widened by feeding the insert in the transverse direction at the time of groove machining, the whole of the cutting debris can be avoided from colliding with the protruding portion, so that the protruding portion and the protruding portion can cut It is possible to reliably separate the debris and achieve smooth processing. Further, even when grooves are formed in the longitudinal direction only for forming grooves or cuttings, the protrusions to which the cutting bosses make sliding contact are not abraded. Therefore, the cutting chips can be stably and smoothly processed in the long term, and the cutting insert having a longer life can be provided.

It is possible to reliably supply the cutting oil to the corner portion of the front cutting edge in the cutting insert used for forming the groove of the workpiece or cutting the workpiece so as to prevent thermal damage or fusing of the portion and to improve the precision and quality It is possible to achieve smooth cutting debris processing without causing an increase in cutting resistance even when the groove width is widened by feeding the insert in the transverse direction at the time of groove machining, It is possible to provide a cutting debris insert capable of always controlling the cutting debris reliably and prolonging the life of the insert.

Carrying out the invention  Best form for

1 to 8 show a first embodiment of a cutting insert according to the present invention. In the present embodiment, the insert main body 1 is formed of a hard material such as a cemented carbide and forms a substantially square shaft shape (square pillar shape) extending along the axis L. The insert main body 1 is provided on a plane M orthogonal to the axis L and positioned at the center in the longitudinal direction of the insert main body 1 (in the direction of the axis L (left and right direction in Figs. 2 to 4) As shown in Fig. Further, the insert body 1 has a symmetrical shape with respect to the plane N as well. The plane N is located at the center of the width direction of the insert main body 1 (vertical direction in Figs. 2 and 4, left and right in Fig. 5) perpendicular to the plane M and includes the axis L And extends in the thickness direction of the insert body 1 (the vertical direction in Figs. 3 and 5).

A cutting edge portion 2 is formed at an end portion (both end portions) in the longitudinal direction of the insert main body 1. These cutting edge portions 2 have the same shape. In the cutting edge portion 2, a substantially rectangular flank surface 5 extending in the longitudinal direction is formed to face the thickness direction. The flank surface 5 has a pair of transverse cutting edges 3 extending in the longitudinal direction and a front cutting edge 4 extending in the transverse direction between the tips of the transverse cutting edges 3, It is equipped in the fringe. The corner portions 6 at which the front cutting edge 4 and the lateral cutting edge 3 intersect each other are formed so as to extend in a direction perpendicular to the longitudinal direction and viewed in a direction opposite to the flank surface 5, (4) and the transverse cutting edge (3).

3, the upper surface portion 7 of the insert body 1 facing the same side as the flank surface 5 in the thickness direction between the cutting edge portions 2 at both longitudinal ends, (2) in the thickness direction. The upper surface portion 7 and the lower surface portion 8 of the insert main body 1 opposite to the upper surface portion 7 are provided with mounting groove portions 7A and 8A Is formed. The mounting grooves 7A and 8A are held by being sandwiched between a pair of left and right jaws formed in a holder of an insert detachable turning tool. The jaws face each other and have a convex V-shaped cross section. The cutting insert is held by the holder, and is used for forming a groove or cutting a workpiece. The end face 7B of the upper face portion 7 facing the longitudinal direction is inclined toward the side of the lower face portion 8 toward the cutting edge portion 2 side.

The front end face of the cutting edge portion 2 facing the longitudinal direction is the rake face 9 of the front cutting edge 4. Both sides of the cutting edge portion 2 facing the width direction are the rake surface 9 of the pair of side cutting edges 3. The cutting insert according to the present embodiment is characterized in that these rake faces 9 include an intersecting ridgeline portion connected to the corner portion 6 so as to be separated from the flank face 5 and toward the lower face portion 8 side It is a positive type insert that is inclined to gradually retract. The end face and the side face of the insert body 1 other than the rake face 9 of the cutting edge portion 2 are planar shapes extending parallel to the thickness direction.

As shown in Fig. 3, the pair of transverse cutting edges 3 are formed so as to extend on a plane perpendicular to the thickness direction, including the corner portion 6. As shown in Fig. The pair of side cutting edges 3 are slightly inclined so as to approach each other in the width direction from the corner portion 6 toward the rear end side of the cutting edge portion 2 and are given a back taper. The front cutting edge 4 is formed to extend in a straight line when viewed from the above plane. On the other hand, in the thickness direction, the front cutting edge 4 is formed such that both end portions on the side of the corner portion 6 extend in the same plane as the corner portion 6 and the transverse cutting edge 3. In addition, the front cutting edge 4 is formed in a concave shape at the center in the width direction and slightly concave in the thickness direction. At least in the corner portion 6, as shown in Fig. 7, a very small land 10 having a width is formed. The flank surface 5 is a positive flank surface inclined so as to gradually recede in the thickness direction as it goes away from the side cutting edge 3, the front cutting edge 4 and the corner portion 6 and toward the inside thereof.

A pair of protruding portions 11 are formed further inside the flank surface 5 which is a positive flank surface. The protrusions 11 each extend toward the corner portion 6 and protrude from the flank surface 5 in the thickness direction. Protrusions 12 protruding in the thickness direction are formed at intervals from the protrusion 11 between the tip of the corner portion of each protrusion 11 and the corner portion 6 thereof. These protruding portions 11 and protruding portions 12 are also formed so as to be spaced apart from each other between the transverse cutting edge 3, the front cutting edge 4 and the corner portion 6.

The protruding portion 11 has an inner wall surface 13 facing the inner side of the flank surface 5 so as to face each other when viewed from the above-mentioned plane between the pair of protruding portions 11, And an outer wall surface 14 facing the side of the transverse cutting edge 3 connected to the corner portion 6, that is, opposite to each other. In the present embodiment, the protruding end face 15 is formed at the portion that becomes the ridge that protrudes most in the thickness direction as the intersecting ridgeline portion of the inner and outer wall surfaces 13 and 14. [ As shown in Fig. 8, the inner and outer wall surfaces 13, 14 are inclined to be separated from each other as they approach the flank surface 5 side, intersect with the projecting end face 15 at an obtuse angle have.

The pair of protruding portions 11 are formed on the tip end side of the cutting edge portion 2 from the first rear end portion 11A whose width is narrower than the end face 7B connected to the end face 7B of the upper face portion 7, And is extended so as to be adjacent to the transverse cutting edge 3 connected to the corner portion 6 toward each of the corner portions 6, respectively. The second rear end portion 11B of the projection 11 branches off from the rear end portion 11A and reaches approximately one half of the total length of the transverse cutting edge 3 in the longitudinal direction. The second rear end portion 11B is formed so as to extend substantially straightly in a V-shape toward the corner portion 6 when viewed from the above plane. The second distal end portion 11C extending from the second rear end portion 11B is formed in a convex curve shape that convexly curves toward the adjacent side cutting edge 3 when viewed from the same plane.

More specifically, the second distal end portion 11C extends from the second rear end portion 11B toward the distal end side of the cutting edge portion 2 when the projecting end face 15 is viewed from the plane, Shaped convex curve that curves away from the transverse cutting edge 3 as it approaches the side of the transverse cutting edge 3 adjacent to the transverse cutting edge 11 and then toward the distal end side. Therefore, the inner wall surface 13 of the pair of the protruding portions 11 at the second front end portion 11C is formed so that the side of the horizontal cutting edge 3 adjacent to each of the protruding portions 11 in the above- And the outer wall surface 14 is on the convex curved surface convexly curved toward the side of the horizontal cutting edge 3 and the radius of curvature thereof is equal to the radius of curvature of the inner and outer wall surfaces 13 and 14 15, the concave curve formed by the inner wall surface 13 is slightly smaller than the convex curve formed by the outer wall surface 14.

The first front end portion 11D of the projection 11 is curved so as to be parallel to the convex arcs formed by the corner portion 6 when seen from the above plane or extend in parallel to the direction of the arcs of the arcs As shown in Fig. The tip end of the first distal end portion 11D is arranged substantially at a position where the central portion of the front cutting edge 4 in the width direction is formed into a concave curve and starts to be recessed in the thickness direction. The protruding end face 15 of the first front end portion 11D is formed such that a portion located on the bisector of the corner portion 6 on the side of the corner portion 6 when viewed from the same plane is a portion The protruding end face 15 and the outer wall face 14 extend in a straight line at a portion extending from the protruding portion to the distal end, The width of the outer wall surface 14 gradually decreases from the protruded portion to the portion where the outer wall surface 14 forms a convex curved surface on the second front end portion 11C, And is formed so as to be constricted in a curved surface.

In the second rear end portion 11B of the protruding portion 11, the inner and outer wall surfaces 13 and 14 are formed so as to be bent concave when viewed from the above plane. The inner wall surface 13 is formed in such a manner that the second rear end portion 11B is recessed and bent in a direction of bending at an obtuse angle with respect to the second front end portion 11C. It is to be noted that the curved portion 13A in which the second front end portion 11C and the second rear end portion 11B intersecting on the concave curved surface of the inner wall surface 13 is formed as a convex curved surface smoothly connected to both concave curved surfaces . The interval in the width direction between the curved portions 13A of the pair of protruding portions 11 is set such that the protruding end face 15 of the pair of protruding portions 11 Is smaller than the distance in the widthwise direction of the tip ends. The second rear end portion 11B of the outer wall surface 14 is also smoothly connected to the second distal end portion 11C on the convex curved surface when seen from the same plane so as to be bent concave with respect to the transverse cutting edge 3 .

The projecting end face 15 is arranged at a position that is perpendicular to the thickness direction from the first rear end portion 11A to the second rear end portion 11B and retreats slightly in the thickness direction from the bottom of the groove of the mounting groove portion 7A Flat surface. The protruding end face 15 is once retreated from the position of the bending portion 13A toward the distal end side in the thickness direction of the second distal end portion 11C while being concavely curved as shown in Figs. 3 and 6, And again reaches a first front end portion 11D of the projection 11 by forming a flat face perpendicular to the thickness direction. The projecting end face 15 of the first distal end portion 11D is arranged so as to protrude extremely slightly from a plane perpendicular to the thickness direction in which the transverse cutting edge 3 is formed. The flank surface 5 is smoothly connected to the inner wall surface 13 from the inner wall surface of the pair of projections 11 and further smoothly in cross section in the width direction along the thickness direction And is formed in a concave curved surface forming a continuous concave curve.

The protrusions 12 are located on the bisector of each corner portion 6 and are spaced apart from the corner portion 6 and the protrusion 11. This protrusion 12 also has a flat projecting end face 16 in the present embodiment and a projecting end face 16 disposed around the projecting end face 16 so as to intersect at an obtuse angle with the projecting end face 16 and gradually expand toward the flank face 5 side. And a photo circumferential wall surface 17. The height of the projecting end face 16 in the thickness direction is equal to the height of the projecting end face 15 of the projection 11 in the first front end portion 11D as shown in Fig. These protrusions 12 are spaced apart from the protrusions 11 so that a gap is formed between the protrusions 12 and the protrusions 11 at a portion where the circumferential wall surface 17 and the outer wall surface 14 cross each other, The concave portion 18 is formed. The bottom surface of the concave portion 18 has a concave curved surface as shown in Fig.

The protruding portion 12 of the present embodiment is formed to extend from the first front end portion 11D of the protruding portion 11 toward the corner portion 6. [ More specifically, the protruding end face 16 forms an oval shape when viewed from the above plane. When the major axis of the ellipse is directed toward the distal end side of the cutting edge 2, Extends toward the corner portion (6). Here, the direction in which the protrusions 12 extend toward the corner portion 6 as viewed from the above plane is a range of 15 to 75 degrees with respect to the axis L extending in the longitudinal direction of the insert body 1 It is preferable to set the angle of inclination to cross the angle? Of the range. In the present embodiment, the angle? Formed by the long axis of the ellipse and the axis L is 30 占 and the bisector is smaller than the angle formed with respect to the axis L.

The projection 12 is formed such that the tip of the projection 12 in the direction of the axis L and in particular the tip of the projection 16 is located closer to the front cutting edge 4 than the projection 11. However, the protruding portion 12 is formed to be sufficiently small as compared with the protruding portion 11. For example, in the present embodiment, the protruding end face, which is an elliptical shape, extends from the protruding end face 15 of the portion from the protruded portion of the protruding portion 11 toward the corner portion 6 on the first front end portion 11D to the tip ), Or even smaller than this. In the drawings, reference numeral 19 is a display for identifying a pair of cutting edge portions 2 formed at both ends of the insert main body 1. In this embodiment, the display portion 19 is a concave portion formed on the projecting end face 15 of the first rear end portion 11A of the protruding portion 11, Only one cutting edge portion 2 is formed.

The cutting insert thus formed is formed into a groove in the workpiece by the front cutting edge 4 of the cutting edge portion 2 and the corner portion 6 at both ends thereof while advancing the insert body 1 in the axial direction L Processing or cutting is performed. In this case, the cutting debris is generated in the direction of the axis L by the front cutting edge 4 and the corner portion 6. This cutting debris is first collided with the protruding portion 12 located at the forward end in the direction of the axis L and then guided to the inside in the width direction and then comes into sliding contact with the first front end portion 11D of the protruding portion 11 Take the resistance and curl in the width direction to get rounded. In addition, even when the widthwise center portion of the front cutting edge 4 is concave, the cutting debris is rolled round in the width direction.

The cutting debris rolled in the width direction is rounded in the width direction while being passed over the flank surface 5 which is a concave curved surface and is rolled round in the direction of the axis L, that is, in the outflow direction, And is sent to the second rear end 11B of the trough 11. In the present embodiment, the inner wall surface 13 of the second front end portion 11C of the protruding portion 11 is in the form of a concave curved surface bent concavely toward the side of the transverse cutting edge 3, Since the interval between the inner wall surfaces 13 of the pair of protrusions 11 is narrow, the cutting debris collides with the bending portion 13A, so that the widthwise direction of the rounded portion and the outflow direction It is divided and processed as receiving more resistance.

In order to lubricate and cool the cutting area by the front cutting edge 4 and the corner portion 6 when the groove is formed in the workpiece in this manner, When the cutting oil is supplied toward the inner surface of the protruding portion 11, the inner surface of the pair of protruding portions 11 passes through the cutting debris as described above, And passes between the blade 3 and the tip end side. In the cutting insert of the above construction, however, the protruding portion 12 formed between the first front end portion 11D of the protruding portion 11 and the corner portion 6 protrudes from the protruding portion 11 with a gap therebetween And the concave portion 18 communicating from the rear end side to the front end side of the cutting edge portion 2 is defined between the protrusion 11 and the protrusion 12. Therefore, it becomes possible to supply the cutting oil through the concave portion 18 to the front cutting edge 4 securely.

Therefore, according to the cutting insert, it is possible to effectively lubricate and cool the cutting area by the front cutting edge 4 by the supplied cutting oil. Therefore, increase in cutting resistance can be suppressed, and it is possible to prevent the front cutting edge 4 from being damaged or welded due to the heat generated at the time of cutting, so that it is possible to extend the life of the insert It becomes. Particularly, the concave portion 18 between the protrusion 11 and the protrusion 12 is opened toward the corner portion 6 side of the front cutting edge 4, and therefore, Can be reliably prevented. Therefore, it is possible to finely finish the groove wall face at the time of forming the groove of the work material formed by the corner portion 6 side of the front cutting edge 4 and the cut face at the cutting processing with high precision.

When the insert body 1 is thus formed in the longitudinal direction (in the direction of the axis L) to perform the groove forming or cutting processing, the cutting debris is transferred to the first front end portion of the protruding portion 11 (11D) so that the sliding contact causes the resistance to be rounded. The protrusion 11 is formed to extend toward the corner portion 6 and has a certain length and extends on the flank surface 5, Even if it is worn, it is not worn out. 9A, the abrasion of the bar B progresses to increase the height H of the bar B, as shown in Fig. 9A, when the abrasion of the bar B is the same as that described in Japanese Laid-Open Patent Publication No. 9-174308, The bar (B) disappears. 9A, the same reference numerals as in the first embodiment shown in Fig. 9B are used for the portions other than the bar (B), and the description is omitted.

On the other hand, if the protruding portion 11 receives resistance by cutting debris like the cutting insert, even if the first front end portion 11D is retracted due to abrasion as shown in Fig. 9B, none. In addition, in the present embodiment, since the protruding end face 15 of the first front end portion 11D of the protruding portion 11 is a flat face perpendicular to the thickness direction, as shown in Fig. 9B, The height H remains unchanged. Therefore, a constant resistance can always be given to the cutting debris, so that smooth cutting debris processing can be performed and a cutting insert with a long life can be provided.

On the other hand, at the time of forming the grooves, the insert body 1 is fed in the direction of the axis L to form grooves up to a predetermined depth, and then the insert body 1 is fed in the width direction (transverse direction) In the case of machining, the cutting is performed by the side cutting edge 3 and the corner 6 on the side to be fed in the width direction. Also in this case, since the protruding portion 11 and the protruding portion 12 are spaced apart from each other in the cutting insert having the above-described structure, the cutting resistance can be reduced and smooth and reliable processing of the cutting debris can be achieved.

The cutting debris generated by the side cutting edge 3 and the corner portion 6 connected to the side cutting edge 3 flows out from the corner portion 6 in the width direction of the insert body 1 by the predetermined depth , The outer wall surface (14) of the projection (11) and the projection (12) are collided and processed. At this time, since the protruding portion 11 and the protruding portion 12 are spaced apart from each other, the entirety of the cutting debris is separated from the protruding portion 11 and the protruding portion 12, particularly, the outer wall surface 14 of the protruding portion 11 Called " total contact ", so that the resistance when the cutting debris collides can be suppressed. Particularly, in the present embodiment, the outer wall surface 14 of the second front end portion 11C of the protruding portion 11 is convex on the side of the horizontal cutting edge 3 when viewed from the above plane. Therefore, even at the portion where the cutting debris impacts on the outer wall surface 14, only the periphery of the portion that is most convex and approaches the side of the side cutting edge 3 collides with each other. Therefore, the cutting resistance received from the cutting debris is further reduced can do.

On the other hand, the cutting debris generated by the transverse cutting edge 3 by collision with the protruding portion 12 and the protruding portion 11 with the spacing in this way causes the cutting debris 12 cut by the front cutting edge 4, Are bent so as to be rolled round in the width direction thereof (the longitudinal direction in the insert main body 1), and in the same manner as in the case where they collide with the tips of the pair of projections 11, And curled so as to be rolled round in the outflow direction (width direction in the insert main body 1) by being pressed against the protrusion 11 and the protruding portion 12. Therefore, since the cutting debris is bent in the width direction and the outflow direction in this way, the cutting debris is easily subjected to the stress and is divided, and the resistance when the cutting debris collides against the protrusion 11 and the protrusion 12, At least the cutting chips can be surely divided and processed smoothly.

The protruding portion 12 is formed between the corner portion 6 and the first front end portion 11D of the protruding portion 11 extending toward the corner portion 6. [ Therefore, when the insert body 1 is advanced in the direction of the axis L to perform the groove forming process or the cutting process with the front cutting edge 4 as described above, or when the insert main body 1 is moved in the width direction For example, the insert main body 1 can be moved in the width direction while advancing the insert main body 1, or the insert main body 1 can also be fed in the width direction while retracting the insert main body 1, The cutting debris can be surely guided between the first front end portion 11D of the protruding portion 11 and between the protruding portion 11 and the protruding portion 12 even when the wall surface of the formed groove or the cross section of the workpiece is sloped .

In other words, when the insert body 1 is also advanced in the width direction to cut the groove wall surface or the end face of the workpiece in an inclined manner, the cutting debris can be prevented from being deformed in the width direction 6 to the widthwise dispensing direction side of the front cutting edge 4 and is sloped out toward the rear side in the width dispensing direction as it goes from the front cutting edge 4 toward the rear side in the axial L direction . The projecting portion 12 is disposed between the corner portion 6 on the rear side in the width feeding direction and the first front end portion 11D of the protruding portion 11 so that the cutting debris collides. The cutting debris is guided so that its outflow direction is directed in the direction along the axis L and is brought into sliding contact with the protrusion 11 on the rear side in the width feed direction or is brought into contact with the inner side of the protrusion 11 Curl round and curl.

On the other hand, in the case where the insert body 1 is also moved in the width direction while being retreated to cut the groove wall surface or the end face in an inclined manner, the lateral cutting edge Cutting chips are generated by the tip side portion of the cutting tool 3. The outflow direction of this cutting debris is also inclined and inclined toward the rear side in the width expulsion direction as it is toward the tip side in the axial direction L. [ By the way, the projecting portion 12 is formed between the corner portion 6 on the side of the width-extending direction and the projection 11 in the outflow direction side with respect to the transverse cutting edge 3 which generates cutting debris. Therefore, by colliding with the protrusion 12, the cutting debris can be guided along the width direction perpendicular to the axial line L, so that the cutting debris is guided along the width direction perpendicular to the axial line L as in the case of simply cutting the insert body 1 in the lateral direction , The protrusions (12) collide with the outer wall surface (14) of the projection (11) and are processed. That is, in the cutting insert having the above-described structure, even when the insert body 1 is inclined in this manner, it is possible to reliably process the generated cutting debris.

The projecting section 12 of the present embodiment has a projecting end face 16 formed in an oval shape when viewed from the above plane and extending from the first front end portion 11D of the projecting portion 11 toward the corner portion 6 Respectively. Therefore, when the insert body 1 is extended only in the width direction to widen the groove width as described above, the cutting debris that has collided with the protruding portion 12 is cut along the direction in which the protruding portion 12 extends, To be guided to the rear end side of the main body 2. Therefore, the cutting debris generated by the transverse cutting edge 3 and rolled round in the direction of discharge along the width direction of the insert body 1 as described above comes into contact with the cut groove wall surface as it is, It is possible to prevent the wall surface from being damaged, and it is possible to urge high-precision and high-precision processing.

In the present embodiment, the direction of extension of the protruding portion 12 extending toward the corner portion 6 in this way, that is, the direction of the major axis of the ellipse formed by the protruding end face 16 of the protruding portion 12 as viewed in the plane , And intersects the range of the angle (?) Of 15 to 75 degrees with respect to the axis L when viewed in the plane. If the angle? Is too small to extend parallel to the longitudinal direction of the insert body 1, that is, parallel to the direction in which the transverse cutting edge 3 extends, The cutting debris flowing out along the width direction of the main body 1 may be rounded and come into contact with the groove wall as it is. On the other hand, when the angle? Is too large and the extending direction of the protruding portion 12 becomes closer to the direction orthogonal to the transverse cutting edge 3 when viewed from the above plane, the collision between the protruding portion 12 and the cutting debris approaches the point It is difficult for stable guidance and the protruding portion 12 may be worn prematurely.

However, in this embodiment, the angle? Formed by the extending direction of the protruding portion 12 with respect to the axial line L is smaller than the angle formed by the bisector of the corner portion 6 with respect to the axial line L small. If the angle? Is within the above range, for example, as in the second embodiment of the present invention shown in Fig. 10, the angle? Formed by the extending direction of the projection 21 with respect to the axis L is , The angle between the bisector of the corner portion 6 and the axis L may be larger than the angle formed by the bisector of the corner portion 6 and the axis L. Incidentally, in the second embodiment, the angle? Is 60 degrees. According to the second embodiment in which the angle? Is increased as described above, when groove forming or cutting processing is performed by feeding the insert body 101 in the direction of the axis L, the corner portion 6 of the front cutting edge 4 It is possible to supply the cutting oil through the recess 18 in a wider range to the corner portion 6 itself as well as to the portion on the side of the corner portion 6 side. Therefore, it is possible to further reduce the resistance and further prevent the thermal damage and the welding.

In the first and second embodiments, the protruding portions 12 and 21 are formed so as to extend continuously on the corner portion 6 side with their protruding end faces 16 and 116 as the outline when viewed from the above plane have. Like the insert body 201 of the third embodiment of the present invention shown in Fig. 11, a plurality of, for example, the shape of a truncated cone, etc. from the first front end portion 11D of the protruding portion 11 toward the corner portion 6 side The protrusions 22 may be formed to be spaced apart from each other so that these protrusions 22 may extend discontinuously. In this case, not only the concave portion 18 formed between the protruding portion 22 and the protruding portion 11, but also the concave portion 218 formed at the interval between the protruding portions 22, The cutting oil can be supplied to the workpiece. Therefore, the supply amount of the emulsion can be increased.

Further, for example, if the cutting insert is used only for forming the groove of the workpiece or cutting the workpiece and is not used for widening the groove width, the insert body 301 of the fourth embodiment of the present invention shown in Fig. 12 Even if the truncated cone-shaped protruding portion 23 or the spherical protruding portion having no directionality is protruded one by one between the first front end portion 11D of the pair of protruding portions 11 and each of the corner portions 6 do. In this case, since the interval between the protruding portion 23 and the first front end portion 11D or the corner portion 6 can be made larger, the supply amount of the cutting oil to the side of the front cutting edge 4 can be increased, Cooling can be achieved. In the second to fourth embodiments shown in Figs. 10 to 12, the parts common to those of the first embodiment other than the protruding parts 21 to 23 are denoted by the same reference numerals and the description thereof is omitted.

In the second to fourth embodiments including the first embodiment as well, the second front end portion 11C of the pair of the protruding portions 11 as seen from the above plane is formed so that the protruding portions 11 are adjacent And the outer wall surface 14 is convexly curved in a convex curved shape, with the inner wall surface 13 thereof being concave and curved so as to be bent concavely. The cutting debris generated by the front cutting edge 4 when the insert main body 1, 101, 201, 301 is fed in the direction of the axis L to perform groove forming or cutting processing, The inner wall surfaces 13 facing each other can be subjected to the dividing treatment as described above. On the other hand, the cutting debris generated by the lateral cutting edge 3 in the process of widening the groove width can be processed by the outer wall surface 14 and the protruding portions 12, 21 to 23.

Further, even when the groove width is widened, the insert body (1, 101, 201, 301) as described above is retracted while being transmitted in the width direction, The outflow direction of the cutting debris, which is likely to flow toward the tip end side of the cutting edge portion 2 as the cutting edge portion 1, 101, 201, and 301 is directed inward in the width direction, may change. Even in this case, since the outer wall surface 14 forms a convex curved surface, the outer wall surface 14 always faces the outflow direction of the cutting debris. Therefore, the cutting debris can be stably struck on the outer wall surface 14, thereby ensuring reliable processing.

In the first to fourth embodiments, the outer wall surface 14 at the second front end portion 11C of the protruding portion 11 is a convex curved surface when viewed from the above plane, whereas the second rear end portion 11B Is in the shape of a concave curved surface that is bent concavely with respect to the adjacent horizontal cutting edge 3. Therefore, at the second rear end portion 11B, a large gap can be secured between the transverse cutting edge 3 and the protrusion 11. It is possible to supply more cutting oil to the recesses 18 between the protruding portions 12 and 21 to 23 on the tip end side of the cutting edge 2 and the protruding portion 11 through the large gap . Therefore, according to these embodiments, it is possible to supply the cutting oil to the side of the corner portion 6 of the front cutting edge 4 with certainty and reliably, thereby achieving efficient lubrication and cooling.

In the first to fourth embodiments described above, the protruding end face 15 at the first front end portion 11D of the protruding portion 11 is formed on the bisector of the corner portion 6 as viewed in the plane And is formed so as to be slightly wider on the corner portion 6 side. However, when the protruding end face 15 or the protruding portion 11 itself is located at least in the range including the first front end portion 11D or the first front end portion 11D as well as the second front end portion 11C, Or may be formed so as to extend in a state of a constant width.

13 to 16 show that the width of the projecting end face 115 gradually narrows from the first distal end 111D to the distal end side in the range including the second distal end 111C The insert main body 401, 501, 601, and 701 according to the modification of the first to fourth embodiments. The distance between the protruding portion 111 and the protruding portions 12 and 21 to 23 can be made larger by preventing the portion of the protruding end face 15 or the protruding portion 111 from being widened at the first front end portion 111D. And can be widely secured. Therefore, a large amount of cutting oil can be supplied to the tip side, and the flow of the cutting oil to be fed can be made smooth, so that efficient supply can be urged.

However, even when the width of the protruding end face 115 of the first end portion 111D of the protruding portion 111 is narrowed toward the front end side or a predetermined width is set, the protruding portion 12 Is smaller than the projection (111). That is, when the protruding end faces 16 and 116 of the protruding portions 12 and 21 form an oval shape as in the modification shown in Figs. 13 and 14, the width in the minor axis direction is smaller than the width of the first front end portion Is substantially equal to or smaller than the width of the projecting end surface (115) of the projecting end surface (111D), and the length in the major axis direction is smaller than the projecting end surface (115). When the protruding portions 22 and 23 have a truncated conical shape or a spherical shape and their protruding end faces 216 and 316 are circular as in the modification shown in Figs. 15 and 16, Is substantially equal to or smaller than the width of the protruding end surface 115 of the protruding portion 111 in the first front end portion 111D.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. Additions, omissions, substitutions, and other modifications of the configuration are possible without departing from the spirit of the present invention. The present invention is not limited by the foregoing description, but is limited only by the scope of the appended claims

1 is a perspective view showing a first embodiment of the present invention.

Fig. 2 is a plan view of the embodiment shown in Fig. 1 as viewed from the direction perpendicular to the longitudinal direction thereof and facing the flank surface 5. Fig.

3 is a side view of the embodiment shown in Fig.

Fig. 4 is a bottom view of the embodiment shown in Fig. 1. Fig.

5 is a front view of the embodiment shown in Fig.

6 is an enlarged perspective view of the cutting edge portion 2 of the embodiment shown in Fig.

Fig. 7 is an enlarged plan view of the cutting edge portion 2 in Fig. 2. Fig.

8 is a ZZ enlarged cross-sectional view in Fig.

9A is a view (corresponding to a sectional view taken along the line YY in Fig. 7) showing the change of the height H due to the progress of abrasion of the bar (rod) of the invention disclosed in Japanese Patent Application Laid-Open No. 9-174308, to be.

Fig. 9B is a view (corresponding to a sectional view taken along the line YY in Fig. 7) showing the change in the height H due to the progress of wear in the protruding portion 11 in the first embodiment.

10 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicular to the longitudinal direction of the second embodiment of the present invention.

11 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicular to the longitudinal direction of the third embodiment of the present invention.

12 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicular to the longitudinal direction of the fourth embodiment of the present invention.

13 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicularly to the longitudinal direction thereof as a modification of the first embodiment.

14 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicular to the longitudinal direction of the modification of the second embodiment.

15 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicularly to the longitudinal direction thereof, as a modification of the third embodiment.

Fig. 16 is an enlarged plan view of the cutting edge portion 2 viewed from the direction opposite to the flank surface 5 perpendicular to the longitudinal direction of the modification of the fourth embodiment.

Explanation of symbols

1, 201, 301, 401, 501, 601, 701:

2: cutting edge

3: transverse cutting edge

4: Front cutting edge

5: Flank face

6:

11, 111:

11A: a first rear end portion of the projection 11

11B: the second rear end of the projection 11

11C: the second distal end of the projection 11

111C: the second end of the projection 111

11D: the first end portion of the projection 11

111D: the first end of the projection 111

12, 21 to 23:

13: inner wall surface of the projection 11

14: outer wall surface of the projection 11

15: protruding section of the protrusion (11)

115: protruding section of the protrusion 111

16, 116, 216, 316: projecting sections of the projections 12, 21 to 23

17: The peripheral wall surfaces of the projections 12, 21 to 23

18: a concave portion between the protrusion 11 and the protrusions 12, 21 to 23

218: concave portion between protrusions 216

L: the axis of the insert body (1, 201, 301, 401, 501, 601, 701)

the direction in which the protrusions 12 and 21 to 23 extend in the direction perpendicular to the longitudinal direction of the insert body 1, 201, 301, 401, 501, 601, An angle intersecting an axis L extending in the longitudinal direction of the insert main body 1, 201, 301, 401, 501, 601,

Claims (4)

A cutting insert comprising an insert body having a shaft shape, A cutting edge portion having a rectangular flank surface is formed at an end of the insert body, On the flank surface, A pair of transverse cutting edges extending in the longitudinal direction of the insert body; A front cutting edge extending between the front ends of the transverse cutting edges and extending in a direction crossing the longitudinal direction; A pair of protrusions extending toward the respective corner portions where the respective transverse cutting edges and the front cutting edges cross each other and adjacent to the transverse cutting edges extending to the respective corner portions; Protrusions protruding from the protrusions at intervals between the corner portions of the protrusions on the side of the corner portions and the respective corner portions; Is formed, Wherein each of the corner portions is formed on a convex circular arc which is in contact with the front cutting edge and the transverse cutting edge when viewed in a plane viewed in a direction perpendicular to the longitudinal direction and facing the flank surface, The protruding portion is configured such that, when viewed from the above-mentioned plane, the protruding portion approaches to the side of the lateral cutting edge adjacent to each protruding portion as it approaches the front end side, And the tip portion of the projection is curved so as to be parallel to the convex arcs formed by the corner portions when viewed from the plane or a straight line extending parallel to the direction of the arc of the arc As a result, Wherein the protrusions are formed so as to extend from the tip ends of the protrusions toward the respective corner portions. delete The method according to claim 1, When viewed in a direction perpendicular to the longitudinal direction and in a direction opposite to the flank surface, the protrusions are formed so as to extend in a direction intersecting the range of 15 to 75 degrees with respect to the axis extending in the longitudinal direction Cutting insert. The method according to claim 1, Wherein a plurality of the protrusions are formed to extend from the tip end of the protrusion toward the corner portion between the tip of each protrusion and the corner.

Images