KR20050092817A - A cutting tool with round insert mounting thereof - Google Patents

Abstract

By forming curved engaging protrusions in the seat portion of the cutter body on which the insert is seated and forming engaging grooves corresponding to the engaging protrusions in the lower portion of the insert, the insert can be easily mounted on the seat portion and the seat without any additional parts A cutting tool is disclosed having a round insert which allows the part and the insert to have a large surface contact and thus reinforce the clamping force. The cutting tool according to the present invention has an insert having a first side marginal surface, a second side marginal surface and a third side marginal surface, an upper surface, and a lower surface from an upper side of the circumferential surface to a lower side thereof. On the circumferential surface, a plurality of concave-convex grooves concavely curved toward the insert hole are formed at equal intervals, and the seat portion of the cutter body is provided with a settled surface in which the lower surface of the insert is in close contact, and a fastening screw hole penetrating through the insert hole A fastening screw hole to be fastened is formed, and on one side, an insert is exposed to the outside of the seat portion, and a front opening is formed to perform a cutting operation, and on the surface corresponding to the front opening, the first side free surface is in close contact with the first side free surface from the chip breaker. When the first seating surface, the second seating surface formed in the lower portion of the first seating surface, and extends from the lower portion of the second seating surface to the seating surface and in close contact with the third side marginal surface Tooth surface not to be inserted into the concave-convex groove formed on the inner surface of the third mounting surface on which concave and convex projection is at least one protruding formation is formed side.

Description

Cutting tool with round inserts

The present invention relates to a cutting tool having a circular insert, and more particularly, by forming a curved engaging protrusion on the seat of the cutter body on which the insert is seated, and forming a coupling groove corresponding to the engaging protrusion on the lower part of the insert, The present invention relates to a cutting tool having a circular insert that can be easily mounted to a seat part and can also have a wide surface contact between the seat part and the insert without a separate part, thereby reinforcing clamping force.

In general, cutting tools are mainly used for cutting ferrous, nonferrous metals and nonmetal materials. Typically, a tool is mounted on a machine tool and performs cutting to process a workpiece into a desired shape. This cutting tool consists of an insert with a cutting edge and a cutter body for holding the insert.

In addition, cutting tools can be divided into brazing and indexable types according to the method of fixing the insert. The welding type permanently fixes the cutting edge to the cutter body, and the indexable type fixes the cutter body and the insert. Cutting tool for inserting and detaching inserts into cutter body using screws or other fasteners. Intense cutting tools should be exchanged in a short time when inserts are changed at the end of the life of the insert, and the cutting edges should always be in the same position even if the inserts are repeatedly changed. It must have a supporting force that can be sufficiently fixed even in the cutting load generated during machining.

On the other hand, as a method for cutting a workpiece using a cutting tool, there is a turning process for cutting a rotating workpiece using a fixed cutting tool, and a milling processing for cutting a workpiece fixed while the cutting tool rotates. In turning, the insert is mounted on the seat formed in the turning holder by the coupling screw to perform the inner diameter, the outer diameter, and the imitation of the workpiece.In the milling, the insert is similarly used for the coupling screw in the seat of the rotating body. It is installed to perform flat, side, groove, slope and curved processing.

However, since turning is a workpiece is processed by the transfer of the cutting tool, the feed component which is the cutting resistance which is opposite to the force that the cutting tool is intended to transfer is generated. In this case, the insert mounted to the cutter body may be pushed or rotated in the direction opposite to the feed direction of the cutting tool by the feed component. As a result, the loosening of the coupling screw to play a fixed role, there was a problem that the excessive wear of the edge, a serious defect in the processing surface quality of the workpiece. On the other hand, if the fastening screw is firmly tightening the fixed role is not easy to replace the insert, there was a problem that the screw is broken.

However, in the milling process, unlike turning, the cutting tool rotates and the table on which the workpiece is placed moves, so that the feed force is generated in the opposite direction of the feeding of the table. At this time, the cutting load of the cutting main force is generated in opposition to the rotational direction of the rotating milling cutting tool, and thus, the coupling screw holding the insert is released, or the insert is rotated by the feed force and the main force. There was a problem.

In recent years, high speed, high feed, and high depth of cut machining have been increased to improve the productivity of the workpiece.In addition, various cutting operations such as grooves, inclinations, and imitations have recently been performed in the outer diameter of turning and the planar processing of milling, which have a simple application form. I'm doing it. Therefore, even in high speed, high feed, high depth of cut machining and application of various machining methods, many efforts are being made to perform cutting because the insert or fastening screw is firmly fixed without being rotated.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to form a coupling protrusion curved in the seat portion of the cutter body on which the insert is seated and the coupling groove corresponding to the coupling protrusion in the lower part of the insert By forming the, it is possible to easily insert the insert into the seat portion, as well as to provide a cutting tool having a circular insert that can be a wide surface contact between the seat portion and the insert without a separate component to enhance the clamping force.

In order to achieve the object of the present invention as described above, the present invention,

A cutter having a circular shape and an insert having an insert hole through which a fastening screw penetrates, and at least one chip pocket portion formed on a circumferential surface thereof, and a sheet portion on which a fastening screw is fastened to a tip end of the chip pocket portion. In a cutting tool having a body,

The insert has a first side marginal surface, a second side marginal surface and a third side marginal surface, an upper surface, and a lower surface from the top of the circumferential surface to the lower side, and is concave toward the insert hole on the circumferential surface of the third side marginal surface. A plurality of curved grooves are formed at equal intervals;

The seat portion of the cutter body is provided with a settled surface in which the lower surface of the insert is in close contact, and a settling screw hole for fastening the screw holes through the insert hole is formed on the settled surface, the insert is exposed to the outside of the seat portion on one side to perform the cutting operation The front opening is formed so that the front opening is formed, and on the surface corresponding to the front opening, a first seating surface in close contact with the first side free surface from the chip breaker and a second seating surface formed below the first seating surface; , A circular insert having a third seating surface in which at least one uneven protrusion protrudes from the bottom of the second seating surface so as to be in close contact with the third side marginal surface and the at least one uneven protrusion is formed on the inner surface thereof so as to be fitted on the inner surface; It provides a cutting tool having.

As described above, according to the present invention, the insert is formed in the sheet portion by forming a curved engaging protrusion formed in the sheet portion of the cutter body on which the insert is seated, and forming a coupling groove corresponding to the engaging protrusion in the lower portion of the insert. Not only can it be installed, but the seat and the insert can make wide surface contact without additional parts, which can enhance the clamping force.

Hereinafter, a cutting tool having a circular insert according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing an exploded cutting tool according to the present invention.

Referring to FIG. 1, the cutting tool 100 according to the present invention includes an insert 110, a fastening screw for mounting the cutter body 130 and the insert 110 mounted on the cutter body 130. 150).

FIG. 2 is an enlarged perspective view of the insert shown in FIG. 1, FIG. 3 is a front view of the insert shown in FIG. 2, FIG. 4 is a plan view of the insert shown in FIG. 2, and FIG. 5 is shown in FIG. 2. Is a bottom view of an inserted insert.

2 to 5, the insert 110 is manufactured by using a metallurgy process, that is, a mold metallurgy, sintering, grinding, or the like. The insert 110 has a circular shape having a predetermined thickness and an insert hole 112 through which the fastening screw 150 penetrates is formed from the upper surface 116 to the lower surface 118 in the center portion. On the circumferential surface of the insert 110, a first side marginal surface 114a, a second side marginal surface 114b, and a third side marginal surface 114c are provided from top to bottom.

The first side surface 114a extends radially narrow to the lower side with a predetermined inclination θ1 at the top of the insert 110. At this time, the cutting edge portion 120 is formed between the first side surface 114a and the upper surface 116. Preferably, the inclination θ1 is formed to have an inclination of 0 to 35 ° based on an arbitrary line extending vertically downward from the cutting edge part 120. More preferably, the first side marginal surface 114a is manufactured to have a ratio of 1/3 to 2/3 of the total thickness of the insert 110. The second side marginal surface 114b and the third side marginal surface 114c are formed below the first side marginal surface 114a formed as described above.

The second side marginal surface 114b extends radially narrow from the extended end of the first side marginal surface 114a to the lower side. Preferably, the second side marginal surface 114b is manufactured to have a slope greater than that of the first side marginal surface 114a. The third side marginal surface 114c extends vertically from the extended end of the second side marginal surface 114b to the lower surface 118 of the insert 110. A plurality of uneven grooves 122 are formed on the circumferential surface of the third side marginal surface 114c. That is, the concave-convex groove 122 is formed while being arranged at equal intervals in the circumferential direction of the third side marginal surface 114c and is formed to be concave and curved toward the insert hole 112 on the circumferential surface. Preferably, the third side marginal surface 114c has a lower slope than the inclination of the first side marginal surface 114a and the second side marginal surface 114b and the lower surface at the bottom of the second side marginal surface 114b. It may extend radially to the (118) side, the third side surface 114c is manufactured to have a ratio of 1/5 to 4/5 with respect to the thickness of the insert (110). More preferably, 4 to 36 uneven grooves 122 may be formed on the circumferential surface of the third side marginal surface 114c.

The land surface 124, the first chip breaker 126a, and the second chip breaker 126b are formed on the upper surface 116 that forms the cutting edge portion 120 between the first side surface 114a. Land surface 124 is formed to extend from the cutting edge portion 120 to the central portion of the upper surface 116, radially inward of the land surface 124 to smooth the flow of the chip during cutting and at the same time of the cutting heat A plurality of first chip breakers 126a for minimizing the occurrence are radially concave, and likewise, a plurality of second chip breakers 126b are radially inward of the first chip breakers 126a. It has a shape larger than) and is formed radially concave. Preferably, the first chipbreaker 126a and the second chipbreaker 126b have 4 to 68 concave groove shapes. The insert 110 formed as described above is mounted to the cutter body 130.

Referring back to FIG. 1, the cutter body 130 is formed while maintaining at least one chip pocket portion 132 on the circumferential surface so as to smoothly discharge chips discharged during cutting. Preferably, the chip pocket portion 132 may be unevenly disposed on the circumferential surface to prevent vibration phenomenon while minimizing the cutting resistance transmitted to the insert 110 when cutting. Number of inserts) ± 0 to 35 °. The tip portion of the chip pocket 132 is formed so that the seat portion 134 is settled so that the insert 110 can be placed. At this time, the seat portion 134 is formed with a settled surface 136 is in close contact with the lower surface 118 of the insert 110. A fastening screw hole 138 through which the fastening screw 150 penetrating the insert hole 112 is formed in the center portion of the settled surface 136, and the insert 110 is seated on one side of the settled surface 136. The front opening 140 is formed to be exposed to the outside of the unit 134 to perform a cutting operation. On the other side corresponding to the front opening 140, the first seating surface 142a, the second seating surface 142b, and the third having a curvature corresponding to the insert 110 so that the insert 110 can be smoothly mounted. The seating surface 142c is formed. In this case, the first seating surface 142a extends from the chip pocket portion 132 to the seating surface 136 side of the seat portion 134 so that the first side marginal surface 114a is in close contact with the front opening 140. It is formed to have the same slope as the first side marginal surface to the side (see Figs. 6 and 7). The second seating surface 142b has an inclination greater than that of the first seating surface 142a at an extended end of the first seating surface 142a and extends toward the front opening 140. At this time, the second seating surface 142b is formed so as not to interfere with the second side marginal surface 114b. The third seating surface 142c has a formation corresponding to the third side marginal surface 114c such that the third side marginal surface 114c may be in close contact. That is, the second seating surface 142b is formed between the first seating surface 142a and the third seating surface 142c. The third seating surface 142c extends from the extending end of the second seating surface 142b to the seating surface 136 of the seat portion 134. At this time, one or more uneven protrusions 144 corresponding to the uneven grooves 122 are protruded toward the settled surface 136 so that the uneven grooves 122 may be fitted on the third seating surface 142c.

The following briefly describes the coupling state of the cutting tool 100 having a circular insert formed as described above.

First, in order to mount the insert 110 according to the present invention on the cutter body 130, the insert 110 is placed under the state in which the lower surface 118 of the insert 110 is placed on the seating surface 136 of the seat portion 134. The uneven groove 122 formed in the third side marginal surface 114c of the 110 is inserted into the uneven protrusion 144 formed in the third seating surface 142c. As such, when the uneven groove 122 formed in the insert 110 is inserted into the uneven protrusion 144, the coupling screw 150 penetrates into the insert hole 112 and then faces the penetrating coupling screw 150. Fasten to the fastening screw hole 138 formed in the) to mount the insert 110 to the seat portion 134. In this way, the first side free surface 114a of the insert 110 to which the fastening screw 150 is fastened to the fastening screw hole 138 is closely supported by the first seating surface 142a of the seat portion 134 to support the support surface. To form. At this time, if the ratio of the thickness of the first side marginal surface 114a is outside the range of 1/5 to 4/5, the role of the supporting surface formed in close contact with the first seating surface 142a is reduced and the cutting is performed during cutting. Not only there is a risk of damage due to the load, but also the second side marginal surface 114b and the third side marginal surface 114c are separated out. Meanwhile, the third side marginal surface 114c is tightly supported by the third seating surface 142c and is prevented from being rotated by the uneven protrusion 144 inserted into the uneven groove 122 to form another support surface. . At this time, the uneven groove 122 may increase the clamping force by increasing the surface contact with the uneven protrusion 144. Similarly, when the ratio of the thickness of the third side marginal surface 114c is out of the range of 1/5 to 4/5, the clamping force is reduced and cracking occurs due to the lack of rigidity of the third side marginal surface 114c.

As such, the insert 110 is mounted on the cutter body 130 to perform a cutting process. When the cutting blade 120 of the insert 110 is blunted by the cutting process, the coupling screw 150 is released to insert the insert 110. In the state that the unused cutting edge portion 120 is exposed to the front opening portion 140 side, the coupling screw 150 is tightened again and then the cutting process is performed. Although the milling cutting tool has been described above, it can be used for the cutting tool 200 for turning as shown in FIG. 8.

As described above, the cutting tool 100 having a circular insert according to the present invention forms the uneven groove 122 in the insert 110 and the uneven groove 122 in the seat portion 134 of the cutter body 130 By forming the corresponding protrusions and protrusions 144, the insert 110 mounted on the cutter body 130 is rotated even in various cutting methods of milling and turning and cutting resistance of high speed, high feed, and high cutting. Movement does not occur, there is an advantage that the loosening or tightening of the fastening screw 150 does not occur.

In addition, even if the insert 110 is replaced by the uneven groove 122 and the uneven protrusion 144, the insert 110 can always be mounted at the same position, so the precision of the workpiece is good, and the cutting edge of the insert 110 is processed by processing the workpiece. When 120 is worn, missing, or broken, the cutting edge portion 120 can be easily changed.

On the other hand, the third side marginal surface 114c has a smaller inclination than the first side marginal surface 114a and the second side marginal surface 114b and forms a small settlement surface 136 of the seat portion 134. In case of excessive machining, the insert 110 may be broken so that the first side marginal surface 114a, the second side marginal surface 114b and the third side marginal surface 114c are separated and broken, thereby causing the sheet of the cutter buddy 130 to break. There is an advantage that the deformation of the part 134 can be minimized.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

1 is an exploded perspective view showing an exploded cutting tool according to the present invention,

FIG. 2 is an enlarged perspective view of the insert shown in FIG. 1;

3 is a front view of the insert shown in FIG.

4 is a plan view of the insert shown in FIG. 2,

5 is a bottom view of the insert shown in FIG. 2,

6 is a perspective view showing a state in which the insert according to the present invention is coupled to the cutter body,

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6, and

8 is a perspective view showing a state in which the insert according to the invention coupled to the holder for turning.

Explanation of symbols on the main parts of the drawing

100: cutting tool with a circular insert 110: insert

112: insert hole 114a: first side clearance

114b: 2nd side marginal surface 114c: 3rd side marginal surface

116: upper surface 118: lower surface

120: cutting edge portion 122: uneven groove

130: cutter body 132: chip pocket

134: seat portion 136: face down

138: fastening screw hole 140: front opening

142a: first seating surface 142b: second seating surface

142c: third seating surface 144: uneven protrusion

150: fastening screw

Claims (10)

An insert having a circular shape and having an insert hole through which a fastening screw penetrates, and at least one chip pocket portion formed on a circumferential surface thereof, and a seat on which the fastening screw is fastened to the tip of the chip pocket portion is mounted. In a cutting tool having an additional cutter body, The insert has a first side marginal surface, a second side marginal surface and a third side marginal surface, an upper surface, and a lower surface from an upper side of the circumferential surface to a lower side, and the insert on the circumferential surface of the third side marginal surface. A plurality of concave-convex grooves concavely curved to the hole side are formed at equal intervals; The seat portion of the cutter body is provided with a settled surface is in close contact with the lower surface of the insert, the settling surface is formed with a fastening screw hole for fastening the fastening screw hole through the insert hole and the insert is the sheet on one side A front opening part is formed to be exposed to the outside of the part to perform a cutting operation, and a first seating surface in close contact with the first side marginal surface from the chip breaker to the seating surface side on a surface corresponding to the front opening part; The second seating surface formed in the lower portion of the first seating surface, while extending from the bottom of the second seating surface to the settling surface while being in close contact with the third side marginal surface so that the concave-convex groove can be fitted on the inner surface Section having a round insert, characterized in that the third seating surface is formed protruding one or more projections toward the settle side Tools. According to claim 1, wherein the first side marginal surface extends radially narrow with an inclination of 0 ~ 35 ㅀ from the upper side of the insert to the lower side, the second side marginal surface is the extension of the first side marginal surface Extends radially narrower from an end portion to a lower side than an inclination of the first side marginal surface, and the third side marginal surface extends vertically from an extended end of the second side marginal surface to the lower surface of the insert A cutting tool having a round insert, characterized in that the. 3. The cutting tool of claim 2, wherein the third side marginal surface may extend radially narrow from the lower side of the second side marginal surface to the lower surface side. The cutting tool according to claim 2, wherein the uneven groove is formed with 4 to 36 on the circumferential surface of the third side marginal surface. The cutting tool according to claim 1, wherein the first side free surface has a thickness of 1/5 to 4/5 relative to the total thickness of the insert. The cutting tool according to claim 1, wherein the third side free surface has a thickness of 1/5 to 4/5 with respect to the total thickness of the insert. The method of claim 2, wherein the first seating surface is extended to the seat portion side on the upper surface of the chip pocket portion so that the first side marginal surface is in close contact with the first side marginal surface has the same inclination as the first side marginal surface, The second seating surface has an inclination greater than the inclination of the first seating surface at the extended end of the first seating surface and extends toward the front opening side and is formed so as not to interfere with the second side marginal surface. Cutting tool with round insert. According to claim 1, wherein the upper surface of the insert forms a cutting edge between the first side marginal surface, the land surface is formed extending from the cutting edge portion to the central portion side of the upper surface, the radial of the land surface A cutting tool having a circular insert, wherein a plurality of first chip breakers are formed radially concave on the inside, and similarly, a plurality of second chip breakers are formed radially concave on the radial inside of the first chip breaker. The cutting tool according to claim 1, wherein the first chip breaker and the second chip breaker have a concave groove shape of 4 to 68. According to claim 1, wherein the chip pocket portion of the cutter body on the circumferential surface (360 ° / insert number) ± 0 ~ to minimize the cutting resistance transmitted to the insert when cutting Cutting tool having a round insert, characterized in that it can be formed unevenly within the range of 35 °.