KR101145491B1 - Double sides cutting insert And Cutter body Adopted The Same - Google Patents

Abstract

The present invention provides a cutting insert (10) for performing a cutting process, the insert top surface 14 of the polygon shape; An insert lower surface 15 formed in the same shape as the insert upper surface 14 as opposed to the insert upper surface 14; A side connecting the insert top face 14 and the insert bottom face 15; A plurality of upper cutouts 11 'formed at respective corners where the insert upper surface 14 and the side meet; And a plurality of lower cutouts 11 " formed at respective corners where the insert lower surface 15 and the side face each other, wherein the side includes a plurality of upper cutouts 11 ' 11a ', 11b', 11c ', 11d'), and divides the plurality of lower main cuts 11 "into elements 11a", 11b ", 11c", 11d ". A plurality of grooves 13a, 13b and 13c are provided and disposed in the middle among the elements 11a ', 11b', 11c ', 11d' (11a ", 11b", 11c ", 11d", which are upper and lower cutouts. The lengths of the upper and lower major sections 11b 'and 11c' (11b "and 11c") are longer than the outermost upper and lower major sections 11a 'and 11a "on either side. Element 11a ', 11b', 11c ', 11d'; 11a ", 11b", 11c "shorter than outermost top-bottom element 11d ', 11d" , 11d "refer to the center point o of the cutting insert 10 when viewed in plan view with the top surface 14 in plan view. It is formed to be rotationally symmetrical.

Cutting, insert, indexable, milling, notch, nick, groove

Description

Double sides cutting insert And Cutter body Adopted The Same}

The present invention relates to a double-sided cutting insert having a cutting portion mounted to the cutter body, and more particularly, to reduce the contact surface length with the workpiece through the reduction of the cutting length, and to reduce the non-cutting resistance through the reduction of the effective factor The present invention relates to a cutting insert capable of improving durability through smooth chip ejection while reducing vibration.

In general, the cutting tool is mainly used for cutting iron-based, non-ferrous metals, non-metallic materials, is a tool that is usually mounted on a machine tool to perform the cutting to process the workpiece into the desired shape.

In the cutting method using a cutting tool, the rotating workpiece is divided into a turning process in which a fixed cutting tool performs cutting, and a milling process in which the cutting tool rotates to cut a fixed workpiece. The cutting insert is mounted on the body sheet of the cutting tool, and the inner diameter, the outer diameter, and the imitation of the workpiece are processed.In the milling process, the cutting insert is mounted on the insert sheet of the cutter body. Grooves, bevels, curved surfaces, etc.

In addition, the above-described milling process is conventionally pickled only on the upper surface in order to prevent the interference between the cutting tool and the workpiece and to ensure a sharper cutting edge (cutting edge) as the cutting tool rotates to process the fixed workpiece. An additionally provided single sided cutting insert is being applied, and many efforts have been made to solve the problem of the single sided cutting insert.

Cutting tools developed for this purpose are disclosed in US Pat. Nos. 6196771 and 6200072 and European Patent EP 1468770 or US 2004208714.

The cutting inserts mounted on the milling cutter bodies disclosed in US 6196771 and US 6200072 apply a major cut in a curve to perform a double-sided cutting, and have two obtuse angles that affect the roughness of the workpiece. .

Also, chip breaker is applied for smooth flow of cutting chips. Therefore, smooth chip flow was induced in the cutting inserts, and the cutting tools rotated left and right due to the indentations provided at two obtuse angles, and the machining roughness was also improved.

However, the conventional cutting insert is provided with an upper surface or a lower surface higher than the main cutting portion and the sub cutting portion, so that the cutting chips do not interfere with the upper surface or the lower surface, but there is a problem that the flow of the cutting chips is hindered.

In addition, the cutting inserts disclosed in EP 1468770 and US 2004208714 apply a main cut in a straight or curved line to perform double-sided cutting, and a step between adjacent inclined surfaces and the top of the cut for smooth flow of cutting chips. ), We tried to induce chip friction reduction and smooth flow. The cutting insert here has a lower upper or lower surface than the pickled portion to induce a smooth discharge of the cutting chip, but the cutting chip is discharged along the surface of the upper or lower surface during cutting, so the upper or lower surface It is not an optimal method for welding or adhering the cutting chips, and it is not intended to improve the roughness of the workpiece.

In order to solve this problem, the applicant has been registered 'milling cutting tool applying the two-sided cutting insert' through Republic of Korea Patent Registration No. 10-0698383. The cutting insert registered by the present applicant has an advantage of extending the service life through the improvement of machining surface roughness and cutting efficiency and durability through the cutting insert formed with pickled portions on both sides.

However, the cutting inserts filed by the applicant of the present application have a disadvantage in that the productivity decrease due to the cutting resistance generated by the cutting chip generated during the cutting process and the component life due to the decrease in the precision and the durability decrease due to the increase in wear remain.

In order to solve such a problem, the prior art has a structure of an insert divided by a groove part of a clearance surface including a main cutting part, and the insert of this structure has a main cutting part in the groove part. As a result, the cutting chips generated at the time of cutting can be divided into small pieces by dividing into a plurality of divided main cutting portions, whereby the cutting resistance can be reduced.

In addition, the Republic of Korea Patent Application No. 10-2007-7007792 has a substantially plate-like, inclined surface on one side of the thickness direction, the clearance surface on the side, and the main ridge in the intersection ridge of the slope and the clearance surface A throwaway insert comprising a plurality of divided main cutting indents formed with a plurality of divided main cutting indents formed therein, and a configuration in which protrusions are formed at positions corresponding to the respective divided main cutting indents protruding from the inclined surface are disclosed. .

However, in the insert for a milling cutter body according to the prior art, the insert having a plurality of split cutouts is cut in accordance with the matching grooves when sequentially installed along the outer circumferential surface of the milling cutter body because the groove is formed at the same position Since it is not supported, it requires two kinds of inserts with grooves at different positions so that the grooves are different from each other. As a result, there is a closed end that increases the manufacturing cost, and great care must be taken when inserting the insert into the cutter body. There is a problem with poor workability.

The present invention was created in order to solve the problems of the prior art as described above, an object of the present invention is to form at least one groove portion on the insert side to facilitate chip discharge while the main cut portion is formed on both sides with the workpiece material The present invention provides a cutting insert capable of minimizing a contact surface and a reduction in non-cutting resistance through a reduction of effective factor and maximizing cutting efficiency, and a cutter body capable of accommodating the insert.

In order to solve the above-mentioned problems, in one aspect of the present invention, a cutting insert 10 for performing a cutting process is disclosed.

The cutting insert 10 according to the present invention includes an insert upper surface 14 having a polygonal shape; An insert lower surface 15 formed in the same shape as the insert upper surface 14 so as to face the insert upper surface 14; A side surface connecting the insert upper surface 14 and the insert lower surface 15; A plurality of upper cutouts (11 ') formed at respective corners where the insert upper surface (14) and the side face each other; And a plurality of lower slabs (11 ") formed at each corner where the insert lower surface 15 and the side face each other, wherein the side has a plurality of upper slabs at the plurality of upper slabs (11 '). The elements 11a ', 11b', 11c ', and 11d' are divided, and the plurality of lower cutouts 11 "are elements 11a", 11b ", 11c", and 11d ". A plurality of grooves 13a, 13b, and 13c are provided for dividing into elements, and the upper and lower major elements 11a ', 11b', 11c ', 11d' (11a ", 11b", 11c ", 11d") are provided. The lengths of the upper and lower major sections 11b ', 11c' (11b ", 11c") disposed in the middle of each other are greater than that of the outermost upper and lower major sections 11a 'and 11a ". Long, shorter than the outermost top-bottom element 11d ', 11d "on the other, and the plurality of top-bottom elements 11a', 11b ', 11c', 11d '; 11a" , 11b ", 11c", 11d "are viewed in plan view with the upper surface 14 as a plane. Characterized in that the formed to rotate around the symmetry center (o) group of cutting insert 10.

In addition, when the two cutting inserts 10 are overlaid so that each of the cutting inserts 10 face each other, the grooves 13a of one of the cutting inserts 10 are formed. 13b, 13c and the other top cutting elements 11a ', 11b', 11c ', 11d' of the cutting insert 10 overlap the plurality of grooves 13a, 13b, 13c with the top cutting It is characterized by being covered by phosphorus elements 11a ', 11b', 11c ', 11d'.

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In addition, in another aspect of the present invention, a cutter body 1 provided with a plurality of populations 2 on which the upper surface 14 or the lower surface 15 of the above-described cutting insert 10 is provided is disclosed.

The population 2 of the cutter body 1 according to the present invention is a cutter body provided with a plurality of populations 2 on which the upper surface 14 or the lower surface 15 of the double-sided cutting insert 10 may be seated. As (1), the population 2 includes a population bottom surface 3 on which the upper surface 14 or the lower surface 15 of the cutting insert 10 is seated, and an upper portion of the cutting insert 10. The face 14 or the lower face 15 includes a population side 4 for supporting the side of the cutting insert 10 when seated on the population bottom 3, wherein the population side 4 A plurality of protrusions 113a, 113b, 113c formed at positions corresponding to the plurality of grooves 13a, 13b, and 13c of the cutting insert 10 may be provided.

In addition, an upper surface 14 and a lower surface 15 of the cutting insert 10 are alternately seated on each of the population bottom surfaces 3 of the plurality of populations 2, and the plurality of populations 2 When the upper surface 14 of the cutting insert 10 is seated on the population bottom surface (3), the position corresponding to each of the plurality of grooves (13a, 13b, 13c) of the cutting insert (10) The cutting insert 10 when the population 2 having the plurality of protrusions 113a, 113b, and 113c formed thereon and the lower surface 15 of the cutting insert 10 are seated on the bottom 3 of the population. The populations 2 having the plurality of protrusions 113a, 113b, and 113c are formed at alternating positions corresponding to the plurality of grooves 13a, 13b, and 13c, respectively.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor can properly define the concept of a term to describe its invention in the best possible way It should be construed as meaning and concept consistent with the technical idea of the present invention.

The cutting insert according to the present invention has the advantage of having twice the service life because the cutting edge is provided in the upper surface and the lower surface and the cutting edge is provided twice as compared to the conventional one-sided insert.

That is, the double-sided cutting insert of the present invention can increase the number of corners used by being pickled on both sides, thereby increasing the economic efficiency, and reducing the length and effective factor of contacting the workpiece by the divided pickling during processing. Cutting resistance can be reduced according to the decrease of the specific cutting resistance due to the reduction, so that the cutting conditions can be adjusted upward compared to the conventional tools, thereby increasing productivity. In addition, by creating a divided chip according to the shape of the divided pickling is advantageous to the chip discharge can minimize the interference between the chip and the cutter body can ensure a long life of the tool is expected to be very useful in the industry.

In addition, at least one groove portion is formed on the side surface of the double-sided cutting insert according to the present invention, wherein the groove portion is disposed at the upper side when two inserts are stacked so that the upper and upper surfaces, or the lower and lower surfaces of the insert face each other. On the plan view, the main cutouts of the second insert are formed to be arranged at the grooves of the first insert, and the main cutouts of the first inserts are arranged to be arranged at the grooves of the second insert. And, through this there is an advantage that can be expected to improve the productivity by minimizing the cutting resistance by reducing the contact surface length with the workpiece through the reduction of the pickled length.

In addition, by providing a protrusion corresponding to the groove on the population side of the cutter body according to the present invention can prevent the incorrect fastening of the double-sided cutting insert.

By the configuration of the projections, a plurality of populations provided in the cutter body of the present invention can be fastened alternately so that the upper and lower surfaces of the insert is settled when the upper and lower surfaces of the insert when fastening the insert and the lower surface of the insert corresponding to the groove By alternately arranging the projections corresponding to the grooves of the city, it is possible to prevent the incorrect fastening of the insert.

The objects, features and advantages of the present invention described above will become more apparent from the following detailed description.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, it should be noted that like elements or parts in the drawings are denoted by the same reference numerals as much as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The cutting insert according to the present invention is mainly manufactured by cementing cemented carbide materials using powder metallurgy, that is, mold pressure, PIM (Powder Injection Mold), sintering or the like.

1 to 8 show a cutting insert 10 according to a first embodiment of the invention.

1 and 2 are a plan view and a bottom view when the cutting insert 10 is viewed from above and below, respectively, FIG. 4 is a perspective view of the cutting insert 10 according to the present invention, and FIG. 6 is a side view, and FIG. 6 is a side view of FIG. 2. In addition, FIG. 3 is a plan view seen from above when two inserts are stacked so that the top and top surfaces 21-21, or the bottom and bottom surfaces 22-22 of the cutting insert 10 face each other, and FIG. 3 is a side view of FIG. 3, and FIG. 8 is a perspective view of FIG. 3.

As shown, the cutting insert 10 has an insert upper surface 14 formed in a polygonal plate shape and an insert lower surface 15 provided in the same shape as the insert upper surface 14 opposite to the insert upper surface 14. And an insert side (not shown) connecting between the insert top face 14 and the insert bottom face 15.

In addition, the upper surface edge portion (t), the lower surface edge portion (b) corresponding to the upper surface edge portion (t) and formed on the side connecting the upper surface edge portion (t) and the lower surface edge portion (b) A groove 13 is provided, and a pickle formed of a main cut portion 11 and a sub cut portion 12 is formed along the edge of the upper edge portion t and the lower edge portion b.

The cutting insert of such a configuration is used to selectively replace the upper surface or the lower surface when cutting the ferrous or non-ferrous metal, the upper and lower surfaces of the cutting insert at this time has a symmetrical shape.

Meanwhile, a circular opening 10'h is vertically penetrated at the center of the cutting inserts 10 'and 10' according to the embodiment, and the cutting inserts 10 'and 10' have a circular opening 10'h. Based on the center of the polyhedron.

In addition, an incision part 12 is provided at each corner portion of the upper edge part t and the lower edge part b, wherein the upper edge part t and the lower edge part b are provided. The formed main cut portion 11 is provided in a shape that is lowered toward the corner portion of the other side with respect to the corner portion, and the other main cut portion adjacent to the main cut portion is provided in a shape that is connected by the sub cut portion.

The insert upper surface 14 and the insert lower surface 15 are inserted into the cutter body 1 (see FIG. 28), more specifically, the insert seated on the population bottom surface 3 (see FIG. 28) of the cutter body 1. An upper surface 21 and an insert lower surface 22 are provided.

In the present exemplary embodiment, the entire insert upper surface 14 and the lower insert surface 15 are illustrated as being the insert upper surface 21 or the insert lower surface 22, but are not limited thereto.

That is, as shown in another embodiment (FIGS. 9 to 18), the insert upper surface 21 or the insert lower surface 22 is composed of a part of the insert upper surface 14 or the insert lower surface 15 instead of the whole. It is common.

The insert top surface 14 and the insert bottom surface 15 are preferably formed in the shape of a polygonal plate with a vertex cut out. In the present exemplary embodiment, the insert upper surface 14 and the insert lower surface 15 are illustrated as being triangular, but the present invention is not limited thereto, and the polygon angle as shown in another embodiment (FIGS. 9 to 18) is illustrated. The number can vary widely (eg quadrilateral, pentagon, etc.).

The edge formed by the insert top surface 14 or the insert bottom surface 15 and the side of the insert forms a major cut 11 and a sub cut 12.

The main cutting edge 11 is an edge formed by the sides of the insert forming the polygon of the insert upper surface 14 or the insert lower surface 15 and the side of the insert. The insert upper surface 14 and the insert upper surface which meet the insert side. The upper main cut 11 'of (14) and the lower main cut 11 " of the insert lower face 15 formed in contact with the insert lower face 15 and the insert side face.

The subcutaneous part 12 is an edge formed by the cut vertex portion of the insert upper surface 14 or the insert lower surface 15 and the insert side, and the insert upper surface 14 formed by the insert upper surface 14 and the insert side. ), The insert 12 'and the insert lower surface 15 and the insert lower surface 15 formed in contact with the insert side 12'.

In addition, the insert side is provided with a plurality of grooves 13 (13a, 13b, 13c) connecting the insert upper surface 14 and the insert lower surface 15. Although the number of the grooves 13a, 13b, and 13c is three in the present embodiment, the number of the grooves 13a, 13b, and 13c is not limited thereto and may be variously modified.

As shown in FIGS. 1 and 5, the upper major cutting 11 'of the insert upper surface 14 is formed by the plurality of upper major cutting elements 11a', by the grooves 13a, 13b, 13c formed on the side of the insert. 11b ', 11c', and 11d ', and in the same manner, as shown in Figs. 2 and 6, the bottom major cut 11 "of the insert lower surface 15 is also formed in the grooves 13a, 13b, 13c. By the plurality of lower main cutouts 11a ", 11b", 11c ", and 11d".

In addition, as shown in Figs. 1 and 5 and 2 and 6, the grooves 13a, 13b, 13c according to the present invention are asymmetrically left and right in the upper and lower major cutouts 11 ', 11 ". In other words, the grooves 13a, 13b, and 13c refer to the centerline c passing through the center point o of the cutting insert 10 and perpendicular to the major cutting lines 11 'and 11 ". It is arranged asymmetrically to the left and right.

More specifically, as shown in FIGS. 1 and 5, when viewed from the insert top surface 14, the grooves 13a, 13b, 13c are the centerline c of the insert top surface 14-the insert top. It is arranged eccentrically to the left with respect to the imaginary vertical line-11, which is the upper major section 11 ′ at the center point o of the face 14.

Similarly, as shown in FIGS. 2 and 6, when viewed from the insert bottom surface 15, the grooves 13a, 13b, 13c are the centerline c of the insert bottom surface 14-the insert bottom surface 15. At the center point o of the center) is arranged eccentrically to the right with respect to the imaginary vertical line-11 ", which is the lower major cut.

In addition, when the arrangement of the grooves 13a, 13b, and 13c in one major section (11: 11 ', 11 ") is determined, this arrangement structure is the same in the other main sections (11: 11', 11"). Is formed. Therefore, when the plurality of grooves 13a, 13b, and 13c in the specific main cuttings 11 'and 11 "are rotated by an angle with respect to the insert center point o, the grooves of the other main cuttings 11' and 11" are rotated. 13a, 13b, 13c) exactly.

For example, in the case where the insert upper surface 14 and the lower surface 15 are triangular as shown in FIGS. 1 and 2, a plurality of grooves 13a and 13b provided in the upper and lower major cutouts 11 'and 11 "are formed. Each time 13c is rotated by 120 ° (= 360 ° / 3) with respect to the insert center point o, it coincides with the grooves 13a, 13b, 13c provided in the adjacent major cutouts 11 ', 11 ".

In addition, the space | interval between the some groove part 13a, 13b, 13c formed in each upper-lower main cutting part 11 ', 11 "may be arrange | positioned at equal intervals (L1 = L2), and the groove part 13a as needed. , 13b, 13c may be set differently (L1? L2).

As shown in Figs. 3, 7 and 8, by the arrangement of the groove portions 13a, 13b, and 13c as described above, the two insert upper surfaces 14 and the upper surface 14 are stacked to face each other or two When the lower surface 15 and the lower surface 15 of the insert are stacked to face each other, the groove portions 13a, 13b, and 13c of the inserts are shifted from each other without overlapping arrangements.

That is, as shown in FIG. 3, the groove portions 13a, 13b, and 13c of the other inserts are arranged at intervals between the groove portions 13a, 13b, and 13c of one insert, so that six groove portions 13a and 13b are formed for each major cut. , 13c) do not overlap each other.

9 to 13 show an insert 10 'according to a second embodiment of the invention.

FIG. 9 is a plan view of the insert 10 'viewed from above, FIG. 10 is a bottom view of the insert 10' viewed from below, and FIGS. 11 and 12 are side views of the inserts of FIGS. to be. 13 is a perspective view of the insert 10 '.

The insert 10 ′ according to the second embodiment has the same configuration as the first embodiment except that the chip breaker 101 (see FIG. 13) is added to the insert upper surface 14 or the lower surface 15. same.

14 to 18 show an insert 10 " according to a third embodiment of the present invention.

14 is a plan view of the insert 10 'from the top, and FIG. 15 is a bottom view of the insert 10' from the bottom, and FIGS. 16 and 17 are side views of the insert of FIGS. 18 is a perspective view of the insert 10 '.

In the insert 10 ′ according to the third embodiment, the insert top surface 14 or the bottom surface 15 is quadrangular, and the chip breaker 101, FIG. 18 is inserted into the insert top surface 14 or the bottom surface 15. Except for adding), the rest of the configuration is the same as in the first embodiment.

FIG. 19 is a cross-sectional view taken along the line A-A of FIGS. 9 and 14, wherein the chip breaker 101 is formed with a land b and an inclined surface f at an inclination angle α.

On the other hand, the shape of the main cutting portion 11 can be implemented in various other shapes in addition to the shape described above. This will be described with reference to FIGS. 20 to 26.

As shown in FIG. 20, each major cut may be a straight line parallel to the upper surface of the insert.

As shown in FIG. 21, each major cut may be a combination of a straight line parallel to the insert upper surface and a plurality of arc curves having predetermined radii R1, R2, and R2.

As shown in FIG. 22, each major cut-in may be disposed on a straight line inclined downward by a predetermined angle (θ1) with respect to the insert upper surface from one edge to the other edge, and to connect the end of the inclined straight line and the other edge. The other straight line is arranged.

As shown in FIG. 23, each major cut-in may have a combination of a circular arc curve having a predetermined radius R from one side edge and a straight line connecting the lower end of the circular arc curve with the other edge.

In addition, as shown in FIG. 24, a small circular arc curve having a plurality of predetermined radii r1, r2, and r3 on a straight line which is lowered by a predetermined angle θ2 from one edge to the other edge by combining FIGS. 21 and 22. This may be formed, and the remaining straight line may be formed to connect the end of the straight line which is lowered by a predetermined angle θ2 and the other edge.

In addition, as shown in FIG. 25, a straight line that forms a predetermined angle (Φ) with the upper surface from both edges toward the center is formed, respectively, and a circular arc curve having a predetermined radius R ′ connected to both straight lines is provided at the center portion, thereby being symmetrical. It could be a prize.

In addition, as shown in Fig. 26, each major cutting may be arranged in a step-shaped cutting line forming a predetermined angle (ω1, ω2, ω3) with any plane parallel to the top surface of the insert.

FIG. 27 is a plan view from above of a cutter body 1 of the present invention having a population 2 capable of accommodating a plurality of chip pockets and inserts arranged in rotational circumference in a circumferential direction, and FIG. 28 is a plan view of the present invention. It is a perspective view which illustrates the method of fastening an insert to the cutter body 1 of this invention.

As shown, the cutting insert 10 may be seated directly on the population bottom 3 of the population 2 of the cutter body 1 by the fastening screw 5 but improves the durability of the cutter body 1. The shim 7 and the shim screw 6 may optionally be used.

When the cutting insert 10 is directly seated on the population bottom 3, the bottom 3 is processed into a shape corresponding to the insert top 21 or the bottom 22, and the shim 7 is used. In this case, the upper surface of the shim 7 is processed into a shape corresponding to the insert upper surface 21 or the lower surface 22.

Fig. 29 is a perspective view showing a state in which an insert is fastened to the cutter body 1 of the present invention.

FIG. 30 is a view (odd) in which the bottom surface 3 of the population 2 of any population 2 formed in the cutter body of FIG. 27 is viewed vertically. The bottom surface 22 of the insert of the present invention is the population bottom surface 3. In the case of fastening in contact with, the protrusions 113a, 113b, and 113c are provided on the side surface 4 of the insert so as to correspond to the grooves 13a, 13b, and 13c of the insert.

FIG. 31 is a plan view (View-even) of the population bottom 3 of the population 2 neighboring the population, in which the upper surface 21 of the insert of the present invention is in contact with the population bottom 3. In this case, the projections 113a, 113b, and 113c are provided on the side of the population 4 so as to correspond to the grooves 13a, 13b, and 13c of the insert.

Each population 2 of the cutter body 1 should be fastened so that the upper surface 21 and the lower surface 22 of the cutting insert 10 are alternately seated. That is, the lower surface 22 of the cutting insert 10 is seated on a specific population odd (FIG. 27) of the cutter body 1, and the upper surface 21 of the cutting insert 10 is mounted on a population adjacent thereto (even, FIG. 27). ) Should be guaranteed to be seated in order to prevent wrong tightening.

In order to solve this problem, in the present invention, the groove 13 is provided on the insert side, but the grooves 13a, 13b, and 13c are asymmetrically disposed, so that the grooves when viewed from the insert upper surface 21 and the lower surface 22, respectively. 13a, 13b, 13c) did not overlap each other.

In addition, in order to prevent erroneous fastening of the cutting insert 10, projections 113a, 113b, and 113c corresponding to the grooves 13a, 13b, and 13c are provided in the population side 4 of the cutter body 1. .

That is, when the upper surface 21 of the insert 10 contacts the population bottom surface 3 in the population (even, FIG. 27) of the cutter body 1 on which the upper surface 21 of the cutting insert 10 is to be seated. The projections 113a, 113b, and 113c are provided at positions corresponding to the grooves 13a, 13b, and 13c, and the lower surface 21 of the insert 10 has a population bottom surface 3 in the adjacent population odd (FIG. 27). ), A plurality of protrusions 113a, 113b, and 113c are provided at positions corresponding to the grooves 13a, 13b, and 13c, respectively.

That is, a plurality of populations (2) provided in the cutter body of the present invention when the insert upper surface 21 to the population side (4) to be fastened alternately so that the upper surface 21 and the lower surface 22 of the insert is seated The protrusions 113a, 113b and 113c corresponding to the grooves 13a, 13b and 13c and the protrusions 113a, 113b and 113c corresponding to the grooves 13a, 13b and 13c are alternately arranged when the insert is fastened. It has a structure that prevents incorrect fastening.

On the other hand, the present invention is not limited to the described embodiments, it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

1 is a plan view of the cutting insert according to the present invention viewed from above,

2 is a bottom view of the cutting insert according to the present invention as viewed from below;

3 is a plan view seen from above when two inserts are stacked in such a manner that the same faces 21-21 or 22-22 of the inserts face each other in the cutting insert according to the present invention;

4 is a perspective view showing a cutting insert according to the present invention,

5 is a side view of FIG. 1;

6 is a side view of FIG. 2;

7 is a side view of FIG. 3;

Fig. 8 is a perspective view showing when two inserts are stacked and placed such that the same surfaces 21-21 or 22-22 of the inserts face each other in the cutting insert according to the present invention.

9 is a plan view from above of a cutting insert of a preferred embodiment of the present invention;

10 is a bottom view of the cutting insert of the preferred embodiment of the present invention as viewed from below;

11 is a side view of FIG. 9;

12 is a side view of FIG. 10;

13 is a perspective view showing a cutting insert of a preferred embodiment of the present invention;

14 is a plan view from above of a cutting insert of another embodiment of the present invention;

15 is a bottom view of the cutting insert of another embodiment of the present invention as viewed from below;

16 is a side view of FIG. 14;

17 is a side view of FIG. 15;

18 is a perspective view showing a cutting insert of another embodiment of the present invention;

19 is a cross-sectional view taken along the line A-A of FIGS. 9 and 14;

20 to 26 is a side view showing an embodiment of a cutting insert columnar shape according to the present invention,

27 is a plan view of the cutter body according to the present invention viewed from above;

28 is a perspective view illustrating a method of fastening inserts and parts to a cutter body according to the present invention;

29 is a perspective view of an insert fastened to a cutter body according to the present invention;

30 is a plan view (VIEW-odd) when any population of the cutter body of FIG. 27 is perpendicular to the floor;

FIG. 31 is a plan view (VIEW-even) when another population of the cutter body of FIG. 27 is perpendicular to the floor; FIG.

<Description of the symbols for the main parts of the drawings>

1: cutter body 2: population

3: population bottom 4: population side

5: tightening screw 6: shim screw

7: shim

10 (10 ', 10 ＂): cutting insert 11: cut
11 ': upper cutout 11': lower cutout
11a ', 11b', 11c ', 11d': element with upper major cut
11a ", 11b", 11c ", 11d": elements with lower major cuts

12 (12 ', 12'): Subsection 13 (13a, 13b, 13c): Groove

14: insert top surface 15: insert bottom surface

21: Top of insert 22: Insert when

101: chip breaker 113a, 113b, 113c: protrusion

Claims (6)

Insert top surface 14 of polygonal shape; An insert lower surface 15 formed in the same shape as the insert upper surface 14 so as to face the insert upper surface 14; A side surface connecting the insert upper surface 14 and the insert lower surface 15; A plurality of upper cutouts (11 ') formed at respective corners where the insert upper surface (14) and the side face each other; And And a plurality of lower column cutouts 11 " formed at each corner where the insert lower surface 15 and the side face each other. The side surface is divided into a plurality of upper major cutting elements 11 'and a plurality of upper major cutting elements 11a', 11b ', 11c', and 11d ', and a plurality of lower main cutting elements 11 "are divided. A plurality of grooves 13a, 13b, 13c are provided for dividing into elements 11a ", 11b", 11c ", 11d", which are the lower major sections of Elements 11b 'and 11c', which are disposed in the middle of the upper and lower major cutouts 11a ', 11b', 11c 'and 11d' (11a ", 11b", 11c "and 11d"). (11b ", 11c") is longer than the outermost upper-lower ones (11a ', 11a ") of one side and the outermost upper-lower ones (11d') of the other. , 11d "), The plurality of top-bottom major elements 11a ', 11b', 11c ', 11d'; 11a ", 11b", 11c ", 11d" are viewed in plan view with the top surface 14 in plan view. Double-sided cutting insert, characterized in that formed to be rotationally symmetrical with respect to the center point (o) of the cutting insert (10). The method of claim 1, When the two cutting inserts 10 are folded upside down such that the upper inserts 14 face each other, the grooves 13a and 13b of one of the cutting inserts 10 13c) and the elements 11a ', 11b', 11c ', 11d', which are upper cuts of the other cutting insert 10, are overlapped so that the plurality of grooves 13a, 13b, 13c are the upper cuts. A double-sided cutting insert, characterized by being obscured by (11a ', 11b', 11c ', 11d'). delete delete A cutter body (1) provided with an even number of populations (2) on which the upper surface (14) or the lower surface (15) of the double-sided cutting insert (10) according to claim 1 or 2 can be seated, The population (2), Population bottom surface 3 for seating the upper surface 14 or lower surface 15 of the cutting insert 10, When the upper surface 14 or the lower surface 15 of the cutting insert 10 is seated on the population bottom surface 3, the first and second side surfaces for supporting two sides of the cutting insert 10 are Comprising a population side (4) formed, The first surface of the population side surface 4 is provided with a plurality of protrusions 113a, 113b, 113c formed at positions corresponding to the plurality of grooves 13a, 13b, 13c of the cutting insert 10, The cutter body according to claim 2, wherein a plurality of protrusions (113b, 113c) formed at a position corresponding to the plurality of grooves (13b, 13c) of the cutting insert (10) is provided on the second surface of the population side (4). The method of claim 5, The top surface 14 and the bottom surface 15 of the cutting insert 10 are alternately seated on each of the population bottom surfaces 3 of the plurality of populations 2, The population 2 on which the upper surface 14 of the cutting insert 10 rests on the population bottom surface 3, and the lower surface 15 of the cutting insert 10 on the population bottom surface 3. The seated population 2 is characterized in that a plurality of projections 113a, 113b, 113c and a plurality of projections 113b, 113c opposite to each other on the first and second surfaces of the population side 4 are formed. Cutter body.

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