KR20100081605A - Milling cutting tool having a cutting insert - Google Patents

Abstract

PURPOSE: A milling cutting tool having a cutting insert is provided to apply uniform cutting resistance to each cut portion of the cutting insert, thereby extending the service life of the tool. CONSTITUTION: A milling cutting tool comprises a cutting insert(200), a cutter body, and a joining unit. A circular opening(212) perpendicularly passes through the center of the cutting insert. The cutting insert is placed in the cutter body. The fastening member fixes the cutting insert to the cutter body. The insert comprises an upper surface(210), a lower surface, and a side surface(250) connecting the upper and lower surfaces. A main cut part(220) including one or more stepped cut recesses(252) is formed by the upper or lower surface contacting the side surface.

Description

Milling cutting tool with a cutting insert

The present invention relates to a milling cutting tool applying a cutting insert. More specifically, by forming a stepped cut in the main insert and the inclined surface of the cutting insert, the chip is cut finely during high cutting to reduce the effective cutting cut, thereby reducing friction and reducing cutting resistance. The service life can be increased, and the productivity can be improved by making chip feeding easier and reducing the resistance, so that the feed can be made larger at high cutting time, and the recessed recesses are formed on the upper and lower surfaces of the cutting insert. As a result, not only the cutting resistance between the chip cut finely by the stepped pickling and the upper and lower surfaces can be reduced, but also the cutting direction of the chip and the flow of the cut chip are maintained by the step cutting. The present invention relates to a milling cutting tool with a cutting insert capable of performing directional control.

Generally, a cutting tool is mainly used for cutting ferrous, nonferrous metals, and nonmetallic materials, and is a tool that is mounted on a machine tool and performs cutting to process a workpiece into a desired shape. Methods for cutting using a cutting tool include turning, in which a fixed cutting tool cuts a rotating workpiece, and milling, in which the cutting tool rotates and cuts a fixed workpiece. In turning, a cutting insert is mounted on the body sheet of the cutting tool body for turning, and internal machining, external machining, and imitation of the workpiece are performed.In milling, the cutting insert is mounted on the insert sheet of the cutter body. Machining, side machining, grooving, beveling, curved surface machining are performed.

In the above-described milling process, as the cutting tool rotates to process a fixed workpiece, in order to prevent interference between the cutting tool and the workpiece, and to secure a sharper cutting edge, a conventional one-sided cutting edge is generally provided only on the upper surface. ) Cutting inserts are used. Various studies have been made to solve the problem of the single-sided cutting insert.

Cutting tools developed for this purpose are disclosed in US 6196771 and US 6200072 and in European patent EP 1468770, US published patent US 2004/208714.

The cutting inserts mounted on the milling cutter bodies disclosed in US 6196771 and US 6200072 are provided with the upper or lower surface higher than the main cutting edge and the secondary cutting edge so that the cutting chips do not interfere with the upper or lower surface, but smooth cutting There was a problem in the flow of the chip.

In addition, the cutting insert disclosed in EP 1468770, US 2004/208714 is an optimal method corresponding to the welding or attachment of the cutting chip to the upper or lower surface because the cutting chip is discharged along the surface of the upper or lower surface during cutting. Is not, there is a problem that can not improve the surface roughness of the workpiece.

The present applicant has obtained the Republic of Korea Patent No. 0698383 to solve this problem. The patent has a cutter insert having a cutting insert formed on both sides and a cutter body having at least one insert sheet to which the cutting insert is easily coupled, thereby extending the service life of the cutting insert and the cutter body and improving the surface roughness and cutting efficiency. To maximize.

In addition, cutting inserts which can increase the life of the tool and improve productivity by cutting chips at high cutting time, reducing friction and reducing cutting resistance, and maintaining the flow direction of the cut chips through high cutting through the present application; Further research on milling cutting tools is undertaken.

The present invention has been made to solve the above problems, and in particular, the chip is cut fine during high cutting to reduce the effective machining cut to reduce the friction and reduce the cutting resistance, and as a result the life of the tool In addition, it is possible to increase the productivity by increasing the feed rate at high cutting time by facilitating chip evacuation and reducing the resistance, and the cutting resistance between the chip cut finely by the step cutting and the upper and lower surfaces In addition, the aim of the present invention is to provide a milling cutting tool with a cutting insert capable of controlling the direction of the flow of the chip by maintaining the cutting direction of the chip and cutting the chip. .

Milling cutting tool applying a cutting insert according to an aspect of the present invention devised to achieve the above object is a cutting insert formed by vertically penetrating a circular opening in the center, a cutter body to which the cutting insert is settled, the cutting insert Applied to a cutting tool comprising a fastening means for fixing the cutter body to the cutter body, the insert includes an upper surface and a lower surface, a side connecting the upper surface and the lower surface, and the upper surface or the lower surface and The sides meet to form a main pickle, characterized in that the at least one main pickle is provided with one or more stepped pickles.

The stepped pickles are preferably formed extending to the inclined surface provided on the upper surface or the lower surface adjacent to the main pickling.

In addition, the main section to which the present invention is applied is a curved liner that is bent from the upper and lower centers of each side to the middle side of the center of the side is formed lower than the upper surface and the lower surface, and the corners on both sides of the curved liner In the case of a straight inclined pickle that extends to the pickling side and configured symmetrically about a curved pickle, the stepped pickle may be configured to be provided in the straight inclined pickle.

At this time, the stepped pickling is preferably provided in the left and right symmetrical with respect to the curved pickle.

According to a modification, the stepped pickles may be configured such that some of them are provided at the straight inclined pickles, and others are provided at the curved pickles.

Meanwhile, the shape of the stepped pickles may be variously set.

For example, the stepped pickles may be configured to be recessed with respect to the main pickles to form a concave shape, or may be configured to protrude to the main pickles to form a convex shape.

According to a preferred embodiment of the present invention, the upper surface and the lower surface have the same number of concave recesses as the stepped pickles corresponding to the stepped pickles in an inward direction perpendicular to the side surfaces from the stepped pickles ( recesses can be provided.

At this time, the recessed recess is preferably formed in a hemispherical shape.

Moreover, the shape which is a major part of the insert to which this invention is applied can be modified. That is, the main cut-off includes a straight slope of a right downward slope, a convex curved line on the right side that is a straight slope of the right downward slope, and a straight slope of a right upward slope on the right side of the straight line slope of the convex shape. It can also be configured.

Meanwhile, the insert of the present invention may be applied to a double-sided insert in which the upper and lower surfaces perform cutting.

In this case, the stepped pickles are preferably formed so as to correspond in the vertical direction to the main section of the upper surface and the main section of the lower surface.

In addition, when the insert of the present invention is applied to a double-sided type, the insert includes a corner side connecting the adjacent side and the side surface connecting the corner side at both sides of the corner, the upper surface or the lower surface And the sub-lateral side meet to form a sub-article, and between the sub-article and the main-article is formed a corner pickling connecting the main articulated with the sub-article, a circular through the center of the upper surface and the lower surface An opening is provided, preferably inclined top surface and inclined bottom surface adjacent to the circular opening in the upper surface and the lower surface.

In addition, when applied to a double-sided insert, the submerge is formed with the upper surface and the lower surface meet with the sub-lateral side, and between the submature and the upper surface and the lower surface of the submerge land surface and the subtle inclined surface Each of these can be formed in turn.

In addition, when applied to the double-sided insert the sub-pickles are provided in a convex curve protruding to the top of each of the edge pickles can be configured to be connected to the edge pickles arranged on both sides.

According to the present invention, by forming a stepped cut in the main cutting edge and the inclined surface of the cutting insert, the chip is cut finely during high cutting to reduce the effective cutting cut, thereby reducing friction and reducing cutting resistance. The service life can be increased, and in addition, the chip can be easily discharged and the resistance can be reduced, thereby increasing the productivity during high cutting.

In addition, by providing the stepped pickling in left and right symmetry, the cutting resistance for each cut portion of the cutting insert acts uniformly, thereby reducing the cutting resistance, thereby increasing the tool life.

In addition, according to the present invention has the effect that the direction of the flow of the chip can be carried out by maintaining the cutting direction of the chip and the flow direction of the chip is cut by the stepped pickling.

In particular, the direction control for the flow of the chip cut by the stepped pickling is formed by extending the stepped pickling to an inclined surface (an inclined slope or a curved cut slope) which extends into the upper or lower surface adjacent to the main pickle. The effect is further maximized.

In addition, since the stepped pickling according to the present invention does not have a separate shape on the side, it is not necessary to deform the seat side of the seat for fastening the cutting insert and the cutter body, and can be compatible regardless of the number of stepped pickles. have.

In addition, the main pickle is composed of a straight slope of the right downward slope, a straight slope of the right downward slope, and a straight slope of the right upward slope of the right upward slope of the convex curve. When cutting the chip, it is possible to reduce the cutting resistance of the upper surface by the chip.

In addition, according to the present invention, by forming a recessed recess in the upper surface and the lower surface of the cutting insert, there is an effect that can reduce the cutting resistance between the chip and the upper and lower surfaces cut finely by stepped pickling.

In particular, by providing a corresponding recessed recess in each of the stepped pickles inside the upper surface or the bottom surface, the cutting resistance caused by the chip cut by each stepped pickled into the upper surface or the bottom surface is reduced. Can be further maximized.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible, even if shown on different drawings. 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. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

That is, the following embodiments will be described based on the double-sided insert, but it will be apparent to those skilled in the art that the main features of the present invention can be equally applied to the single-sided insert.

In addition, in the following description, "stepped pickling" means a pickled portion formed by recessing in a staircase shape consisting of a horizontal portion and a vertical portion with respect to the surrounding pickled portion. That is, the stepped pickles have a shape recessed more concavely than the pickled portions of the portions where the stepped pickles are not formed. In this case, the horizontal section and the vertical section of the stepped pickling may be formed to be parallel to the horizontal line and the vertical line to be orthogonal to each other, but the horizontal section and the vertical section form the horizontal section and the vertical section to have a predetermined angle with respect to the horizontal line and the vertical line. The angle may be configured as an acute angle or an obtuse angle.

1 is an exploded perspective view showing a milling cutting tool to which a cutting insert according to the present invention is applied.

Referring to FIG. 1, the cutting tool 100 according to the present invention includes a cutting insert 200, a cutter body 300 to which the cutting insert 200 is settled, and a cutting insert 200 to the cutter body 300. Screw 400). Method and structure of the cutting insert 200 is fixed to the cutter body 300 is described in detail in the applicant's Republic of Korea Patent No. 0698383, description thereof will be omitted.

2 is a perspective view of a cutting insert according to an embodiment of the present invention, Figure 3 is a plan view of a cutting insert according to an embodiment of the present invention, Figure 4 is a front view of a cutting insert according to an embodiment of the present invention. . 5 is a cross-sectional view taken along line AA ′ of FIG. 2, and FIG. 6 is a cross-sectional view taken along line BB ′ of FIG. 2. In FIG. 2, since the lower surface of the cutting insert 200 is formed in the same shape as the upper surface 210, it is noted that no separate reference numeral is given.

2 to 6, the cutting insert 200 is mainly manufactured by cementing cemented carbide materials using powder metallurgy, that is, molding, PIM (Powder Injection Mold), and sintering. The cutting insert 200 connects the upper surface 210, the lower surface parallel to the upper surface 210, the side surface 250 connecting the upper surface 210 and the lower surface, and the adjacent side surfaces 250. And a side surface 260 connecting the edge side surface 270 and the edge side surface 270 on both sides.

The cutting insert 200 selectively replaces the upper surface 210 or the lower surface when cutting ferrous or nonferrous metals. That is, the upper surface 210 and the lower surface of the cutting insert 200 has a symmetrical shape.

A circular opening 212 is vertically penetrated at the center of the cutting insert 200, and the cutting insert 200 is configured as a tetrahedron with respect to the center of the circular opening 212. Preferably, the inclined top surface 242 and the inclined bottom surface that are inclined toward the circular opening 212 are formed in the upper surface 210 and the lower surface adjacent to the circular opening 212.

Subcutaneous 214 is provided at the corners of the upper surface 210 and the lower surface, respectively, and the subcutaneous 214 is formed by the upper surface 210 and the lower surface meeting the sublateral surface 260. Hereinafter will be described with reference to the upper surface 210 made of the same configuration as the lower surface of the cutting insert (200).

Between the cutout 214 and the upper surface 210, a cutaway land surface 216 and a cutout inclined surface 218 are respectively formed in sequence.

The main pickles 220 and the corner pickles 222 are formed between the subcutaneous 214, and the main pickles 220 are formed to meet the upper surface 210 and the lower surface with the side surface 250, and the corners. Pickled 222 is formed with the upper surface 210 and the lower surface meet the edge side 270.

The main cut 220 has curved cutouts 224 formed on the upper and lower centers of the side surfaces 250, respectively, and inclined cutouts 226 extending from both sides of the curved cutouts 224 to the edge pickled 222 side. . At this time, the curved pickle 224 is bent toward the middle of the central portion of the side surface 250, the inclined pickle 226 is connected to the concave curved curved pickle 224. Edge pickles 222 connect each warp pickle 226 and each sub pickle 214, which is provided flat. Here, the main cut 220 is in contact with the workpiece during the cutting process, and contributes to the cutting, the sub cut 214 improves the surface roughness of the processed workpiece.

Between the curved line 224 and the upper surface 210, the curved land surface 228 and the curved line of the sloped surface 230 are formed in turn, and between the sloped line 226 and the upper surface 210, the inclined land surface ( 232 and the inclined surface 234 which are inclined sections are sequentially formed. Similarly, between the cutout 214 and the upper surface 210 is formed a cut land surface 216 and the cut inclined surface 218, and the edge land surface (between the corner pickled 222 and the top surface 210 ( 236 and edge inclined surface 238 are formed in sequence. In this case, the chip breaker 240 is provided on the inclined surface 230 and the inclined surface 234 which are curved sections that meet the upper surface 210. The chip breaker 240 is concave on the land surface 228 which is a curved section and the land surface 232 which is an inclined section, and is connected to the upper surface 210. Preferably, the chipbreaker 240 is a concave groove formed lower than the curved cut 224 so that the cutting chip can be discharged in a smooth flow from the main cut 220 which performs the cutting in the high cutting processing with a large cutting depth. Is provided. More preferably, the chipbreaker 240 in the portion where the main cutout 220 is lower than the upper surface 210 and the lower surface is formed to have a larger width, and has the largest width at the lowest portion of the main cutout 220. It is formed to have.

The main pickling 220 is provided with at least one cut out stepped pickle 252, the stepped pickle 252 being the main characteristic configuration of the present invention.

The stepped pickle 252 may be provided only in the straight inclined pickle 226, or a part may be provided in the straight inclined pickle 226 and the rest may be provided in the curved pickle 224. 2 to 4 illustrate a case where the stepped pickles 252 are provided only in the straight inclined pickles 226. In this case, it is preferable that the stepped pickles 252 be provided symmetrically around the curved pickles 224 for uniform cutting. 2 to 4 illustrate an example in which four stepped pickles 252 are provided per main pickling 220, but is not limited thereto.

By providing the stepped pickles in the right and left symmetry, the cutting resistance of each cutting portion of the cutting insert acts uniformly, thereby reducing the cutting resistance, thereby increasing the tool life.

Stepped pickle 252 is preferably formed to extend to the inclined surface provided on the upper surface 210 or the lower surface adjacent to the main cut-in (220). Specifically, when the stepped pickling 252 is provided at the straight inclined section 226 of the main section 220, the inclination extending in the direction of the upper surface 210 or the lower surface center adjacent to the straight slope section 226 The pickled land surface 232 and the inclined section may be formed to extend to the inclined surface 234. On the other hand, when the stepped pickle 252 is also provided in the curved pickle 224, the curved land section 228 and the curved section extending to the inner side of the upper surface 210 or the lower surface adjacent to the curved pickle 224 and curved It extends to the pickled inclined surface 230.

The stepped pickles 252 are recessed with respect to the main pickles 220 to form a concave shape. That is, the stepped pickles 252 have a shape recessed more concave than the main cut 220 of the portion where the stepped pickles 252 are not formed. At this time, the horizontal portion and the vertical portion of the stepped pickle 252 may be formed to have a predetermined angle with respect to the vertical line and the horizontal line.

The stepped pickles 252 cut chips at high cutting to reduce the effective cutting cuts, thereby reducing friction and reducing cutting resistance. As a result, the life of the tool can be increased. In addition, the stepped pickling 252 can facilitate the chip ejection and reduce the resistance to increase the productivity than the high cutting by improving the productivity. In addition, the stepped pickles 252 allow the cutting of the chip and the flow direction of the cut chip to be maintained.

In particular, the direction control for the flow of the chip cut by the stepped pickling is formed by extending the stepped pickling to an inclined surface (an inclined slope or a curved cut slope) which extends into the upper or lower surface adjacent to the main pickle. The effect is further maximized.

In addition, since the stepped pickling 252 does not have a separate shape on the side surface 250, it is not necessary to deform the sheet side surface of the sheet portion for fastening the cutting insert 200 and the cutter body 300, and the stepped pickling Any number of 252 may be compatible.

According to a preferred embodiment, the upper surface 210 and the lower surface are provided with the same number of recessed recesses 215 as the stepped pickles 252 at positions corresponding to the stepped pickles 252. .

Specifically, the recessed recess 215 is preferably provided with a recessed recess 215 corresponding to each stepped pickle 252.

And, the recessed recess 215 is preferably disposed on the upper surface 210 or the lower surface on an imaginary line extending in the inward direction perpendicular to the side surface 250 from the stepped pickle 252. In other words, when the recessed recesses 215 connect the stepped pickles 252 at positions corresponding to each other formed on the pair of opposing side surfaces 250 in an imaginary straight line, they are positioned on the imaginary straight line. do. For example, when the stepped pickles 252 provided at the top and the bottom of the diagram in FIG. 3 are connected by virtual straight lines, the upper left first stepped pickle and the lower left first stepped pickle are connected to each other and the upper left second stairway. The pickle and the bottom left second stepped pickle are connected to each other (the right side is the same). The concave recesses 215 are formed on the virtual straight lines connected as described above.

As shown in FIG. 2, the concave recess 215 may be formed in a hemispherical shape. Although not shown, the concave recess may be formed in various shapes such as a cube shape, a cuboid shape, and a triangular prism shape.

The recessed recesses 215 are formed at positions corresponding to the stepped pickles 252, and serve to reduce cutting resistance between the chip cut by the stepped pickles 252 and the upper surface 210. .

In particular, by providing a corresponding recessed recess in each of the stepped pickles inside the upper surface or the bottom surface, the cutting resistance caused by the chip cut by each stepped pickled into the upper surface or the bottom surface is reduced. Can be further maximized.

7 is a perspective view of a cutting insert according to another embodiment of the present invention, Figure 8 is a plan view of a cutting insert according to another embodiment of the present invention. The embodiment of FIG. 7 is similar to the embodiment of FIG. 2 except that the stepped pickles are formed in a bottom-up manner, instead of being formed in a top-down manner, and thus the description will be mainly focused on differences.

In the cutting insert 200a according to another embodiment of the present invention, referring to FIGS. 7 and 8, the stepped pickle 252a protrudes with respect to the main cutout 220 and is formed in a convex shape. That is, the stepped pickles 252a are formed upward from the main cut 220. In addition, the stepped pickles 252a are formed to extend to the inclined surface adjacent to the main cut 220.

As described above, the stepped pickles 252a are formed in the bottom-up manner, so that the top-down and the direction control of the flow of the chip can be performed.

9 is a perspective view of a cutting insert according to another embodiment of the present invention, Figure 10 is a plan view of a cutting insert according to another embodiment of the present invention. The embodiment of FIG. 9 is similar to the embodiment of FIG. 2 except that the straight oblique pickle and the curved pickle are formed to perform the role of the step pickling, instead of forming a separate stepped pickling, and thus the description will be mainly focused on differences. .

Referring to FIGS. 9 and 10, the cutting insert 200b according to another embodiment of the present invention is formed in a curved shape in which the curved cutting line 224b is convex. Specifically, the main cut 220b is a curved cut 224b which is curved from the middle side of the center of each side 250 to the top and bottom of the center of the side 250 to be formed higher than the top surface 210 and the bottom surface, It consists of a straight inclined section 226 extending high from both sides of the curved pickle (224b) to the edge pickle (222) side is symmetrical around the curved pickle (224b).

Referring to FIG. 10, the main cutout 220b is a straight slope inclined section 226 having a right downward slope, a convex curved line cutout 224b located at a right side thereof, and a straight slope inclined section 226 having a right upward slope at a right side thereof. It will include.

As such, the curved pickle 224b is formed in a convex shape, thereby reducing the cutting resistance of the upper surface 210 by the chip when cutting the chip by the curved pickle 224b.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

The present invention relates to a milling cutting tool applied with a cutting insert, it can be widely applied in the field of milling, such as planar processing, side processing, grooving, inclined processing, curved processing.

1 is an exploded perspective view showing a milling cutting tool applying a cutting insert according to the present invention,

2 is a perspective view of a cutting insert according to an embodiment of the present invention,

3 is a plan view of a cutting insert according to an embodiment of the present invention,

4 is a front view of a cutting insert according to an embodiment of the present invention,

5 is a cross-sectional view taken along line AA ′ of FIG. 2;

6 is a cross-sectional view taken along line B-B 'of FIG.

7 is a perspective view of a cutting insert according to another embodiment of the present invention,

8 is a plan view of a cutting insert according to another embodiment of the present invention,

9 is a perspective view of a cutting insert according to another embodiment of the present invention,

10 is a plan view of a cutting insert according to another embodiment of the present invention.

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

100: milling cutting tool 200, 200a, 200b: cutting insert

210: top surface 212: circular opening

214: Intemperate 215: Concave recess

216: Intemperate Land Surface 218: Intemperate Slope

220, 220b: main pickled 224, 224b: curved pickled

226: oblique 228: curved land surface

230: curved inclined surface 232: inclined land surface

234: sloped inclined surface 236: land surface inclined

238: inclined surface 240: chipbreaker

242: inclined top surface 250: side

252, 252a: stepped pickled 260: side view

270: corner side 300: cutter body

Claims (16)

A cutting tool comprising a cutting insert having a circular opening vertically penetrated at a center thereof, a cutter body having the cutting insert settled therein, and fastening means for fixing the cutting insert to the cutter body, The insert is An upper surface and a lower surface, and a side surface connecting the upper surface and the lower surface, wherein the upper surface or the lower surface and the side face each other to form a main cut, Milling cutting tool applied to the cutting insert, characterized in that the at least one main cutting is provided with one or more stepped pickling. The method of claim 1, The stepped pickling is a milling cutting tool applied to the cutting insert, characterized in that extending to the inclined surface extending inward adjacent to the main cut-in on the upper surface or the lower surface. The method of claim 1, The main pickles are curved pickles that are bent from the upper and lower centers of the respective sides to the centers of the centers of the sides and are formed lower than the upper and lower surfaces, and straight lines extending higher from both sides of the curved pickles to the edge pickling sides. It is made up of oblique pickles and is symmetrical around the curved pickles. The stepped pickling is a milling cutting tool applied to the cutting insert, characterized in that provided in the straight inclined pickling. The method of claim 3, The stepped pickling is a milling cutting tool applied to the cutting insert, characterized in that provided in the left and right symmetry around the curved pickling. The method of claim 3, The stepped pickling is a milling cutting tool to which a cutting insert is applied, characterized in that a portion is provided in the straight oblique pickling, the rest is provided in the curved pickling. The method of claim 1, The stepped pickling is a milling cutting tool applied to the cutting insert, characterized in that formed in a concave shape recessed with respect to the main cut. The method of claim 1, The stepped pickling is a milling cutting tool to which the cutting insert is applied, characterized in that protruding with respect to the main cutting to form a convex shape. The method of claim 1, The upper and lower surfaces are provided with the same number of recessed recesses as the stepped pickles corresponding to the stepped pickles in an inward direction perpendicular to the side surfaces from the stepped pickles. Milling cutting tool with insert. The method of claim 8, Milling cutting tool to which the cutting insert is applied, characterized in that the concave recess is formed in a hemispherical shape. The method of claim 1, The main cut-off includes a straight slope of the right oblique slope, a straight slope of the convex shape located on the right side of the right slope of the downward slope, and a straight slope of the right upward slope located on the right side of the convex curve section. Milling cutting tool with cutting insert. The method of claim 1, The insert is a double-sided insert in which the upper and lower surfaces perform a cutting process, The stepped pickling is a milling cutting tool applied to the cutting insert, characterized in that formed to correspond in the vertical direction to the main section of the upper surface and the main section of the lower surface. The method of claim 1, The insert is a double-sided insert in which the upper and lower surfaces perform a cutting process, The insert includes a corner side connecting the adjacent side surfaces and a side surface connecting the corner side surfaces at both sides of the corner side, the upper surface or the lower surface and the sub side surface is formed in the subcutaneous, the subsection Between the phosphorus and the main pickle is formed a corner pickling connecting the main pickle with the sub-pickle, a circular opening penetrating the center of the upper surface and the lower surface is provided, Milling cutting tool with a cutting insert, characterized in that the inclined upper surface and the inclined lower surface is formed adjacent to the circular opening in the upper surface and the lower surface. The method of claim 1, The insert is a double-sided insert in which the upper and lower surfaces perform a cutting process, The insert includes a corner side connecting the adjacent side surfaces and a side surface connecting the corner side surfaces at both sides of the corner side, the upper surface or the lower surface and the sub side surface is formed in the subcutaneous, the subsection Between the phosphorus and the main pickle is formed a corner pickling connecting the main pickle with the sub-pickle, a circular opening penetrating the center of the upper surface and the lower surface is provided, The submerge is formed with the upper surface and the lower surface meet with the sub-lateral side, and between the submature, the upper surface and the lower surface is formed in the inclined surface of the sub-land and the sub-inclined surface, respectively. Milling cutting tool with cutting insert. The method of claim 1, The insert is a double-sided insert in which the upper and lower surfaces perform a cutting process, The insert includes a corner side connecting the adjacent side surfaces and a side surface connecting the corner side surfaces at both sides of the corner side, the upper surface or the lower surface and the sub side surface is formed in the subcutaneous, the subsection Between the phosphorus and the main pickle is formed a corner pickling connecting the main pickle with the sub-pickle, a circular opening penetrating the center of the upper surface and the lower surface is provided, The subcutaneous and the corner pickling is a milling cutting tool applied to the cutting insert, characterized in that formed higher than the upper surface and the lower surface. The method of claim 1, The insert is a double-sided insert in which the upper and lower surfaces perform a cutting process, The insert includes a corner side connecting the adjacent side surfaces and a side surface connecting the corner side surfaces at both sides of the corner side, the upper surface or the lower surface and the sub side surface is formed in the subcutaneous, the subsection Between the phosphorus and the main pickle is formed a corner pickling connecting the main pickle with the sub-pickle, a circular opening penetrating the center of the upper surface and the lower surface is provided, The main pickles are curved pickles that are bent from the upper and lower centers of the respective sides to the centers of the centers of the sides and are formed lower than the upper and lower surfaces, and straight lines extending higher from both sides of the curved pickles to the edge pickling sides. Milling cutting tool with a cutting insert, characterized in that the symmetrical centering around the curved pickle is made of oblique pickling. The method of claim 1, The insert is a double-sided insert in which the upper and lower surfaces perform a cutting process, The insert includes a corner side connecting the adjacent side surfaces and a side surface connecting the corner side surfaces at both sides of the corner side, the upper surface or the lower surface and the sub-lateral side is formed in the subcutaneous, the subcutaneous An edge pickle is formed between the phosphorus and the main inn to form a corner pickle connecting the main inn and the subin, and a circular opening penetrating the center of the upper and lower surfaces is provided. The subcutaneous milling cutting tool is applied to the cutting insert, characterized in that provided in the convex curve protruding to the top of each edge pickling and connected to the edge pickles arranged on both sides.

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