KR100613245B1 - A cutting tool with round insert mounting thereof - Google Patents

Abstract

The surface roughness of the workpiece can be improved when cutting the workpiece, and the cutting chips issued during cutting can be removed to facilitate the discharge of the cutting chips, and the life of cutting tools and high speed, high feed, and high cutting Cutting tools with improved circular inserts have been disclosed that make this possible. The cutting tool according to the present invention includes a circular upper surface, a lower surface and a side portion connecting the upper surface and the lower surface, and a screw hole is formed in the central portion of the upper surface to the lower surface so that the screw can pass therethrough, A cutting insert having a cutting edge formed at a periphery of the upper surface which meets the cutting edge, and at least one grooved cutting edge formed radially on the upper surface; And at least one chip pocket portion is formed on the circumferential surface to maintain the same interval so as to smoothly discharge the chip discharged during the cutting process, the sheet portion is settled so that the cutting insert is placed on the tip of the chip pocket portion It is formed, and the seat portion is formed with the lower surface of the cutting insert is in close contact with the center of the settle surface includes a cutter body is formed with a fastening screw hole for fastening the screw through the screw hole.

Description

Cutting tool with an improved round insert

1 is an exploded perspective view showing an exploded view of a cutting tool having an improved round insert according to the present invention,

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

3 is a plan view of the cutting insert shown in FIG.

4 is a front view of the cutting insert shown in FIG.

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

6 is an enlarged perspective view illustrating an enlarged sheet part of the cutter body illustrated in FIG. 1;

7 is a perspective view showing a state in which the cutting insert is coupled to the cutter body shown in Figure 1,

8 is a plan view showing a cutting insert coupled to the cutter body shown in FIG.

9 is a front view illustrating a cutting insert coupled to a cutter body illustrated in FIG. 7.

Explanation of symbols on the main parts of the drawing

100: cutting tool with improved round insert

110: cutting insert 112: upper surface

114: lower surface 116: side

118: screw hole 120: cutting edge

122: groove cutting edge 124: first side clearance

126: second side clearance 128: uneven side

130: uneven groove 140: cutter body

142: chip pocket 144: seat

146: Anchimyeon 148: Fastening screw hole

150: front opening 152: first seating surface

154: second seating surface 156: third seating surface

158: uneven protrusions 160: screw

The present invention relates to a cutting tool having a circular insert, and more particularly, it is possible to improve the surface roughness of the workpiece when performing the cutting operation of the workpiece, and to separate the cutting chips issued during cutting to smoothly discharge the cutting chips. It also relates to a cutting tool having an improved round insert which allows for improved tool life and high speed, high feed and high depth of cut machining.

In general, a cutting tool is mainly used for cutting ferrous, nonferrous metals, and nonmetallic materials, and is a tool that is usually mounted on a machine tool and performs cutting to process a workpiece into a desired shape. Such a cutting tool typically consists of a cutting insert having a cutting edge and a cutter body to which the cutting insert is mounted and fixed.

In addition, the cutting tool can be divided into welding type and indexable type according to the method of fixing the cutting insert. The welding type is to permanently fix the cutting edge by welding to the cutting tool body. The indexable type is the cutting tool. It is a cutting tool that attaches and detaches a cutting insert to a cutting tool body, that is, a cutter body by using a screw or other fixing device for fixing the body and the cutting insert.

Indexable cutting tools should be replaced when cutting inserts have reached the end of their service life. In this case, the cutting inserts should be exchanged in a short time, and should be easy to change. In addition to being in the same position at all times, it must have a bearing capacity that can be sufficiently fixed to the cutting load generated during the cutting operation. In addition, in order to improve productivity, the surface roughness of the workpiece should be maintained without sacrificing the processing surface roughness at high speed, high feed, and high cutting processing.

On the other hand, as a method of cutting a workpiece using a cutting tool, there is a turning process for cutting the rotating workpiece using a fixed cutting tool and milling processing for cutting the workpiece fixed while the cutting tool rotates. In turning, the cutting insert is mounted on the seat of the body of the cutting tool for turning, and performs the inner diameter, the outer diameter, and the imitation of the workpiece.In milling, the cutting insert is cut into the sheet of the cutter body, which is a milling cutting tool. Inserts are mounted to perform flat processing, side processing, grooving, inclined processing, and curved processing.

However, in the recent milling process, a variety of processing methods such as high speed, high feed, high cutting processing and plane, side, groove, slope, and curved processing have been applied to improve the productivity of the workpiece. In order to develop a cutting tool that can not only rotate the cutting insert or fastening screw but also securely perform cutting as well as obtain the surface finish of the workpiece. Many efforts are being made.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to mount a cutting insert having a cylindrical or conical shape to the cutter body to perform the cutting process in the plane processing, side processing When processing high speed, high feed, and high cutting in various processing such as, grooving, beveling, curved surface processing, etc., the surface roughness of the workpiece is excellent, and the cutting chips are separated to prevent damage to the cutting inserts. The chip is discharged smoothly, and the cutting resistance is reduced, so that not only the life of the cutting tool is improved, but also the cutting insert is securely settled in the sheet part of the cutter body. To provide a cutting tool with improved round inserts to achieve a good surface finish of the workpiece without compromising All.

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

A circular upper surface, a lower surface and a side portion connecting the upper surface and the lower surface, and the screw hole is formed in the center of the upper surface to the lower surface so that the screw can penetrate, at the periphery of the upper surface that meets the side surface A cutting insert in which a cutting edge is formed and at least one grooved cutting edge is radially formed on an upper surface thereof; And

At least one chip pocket part is formed on the circumferential surface at equal intervals so as to smoothly discharge the chip discharged during cutting, and the sheet part is formed to settle so that the cutting insert is placed at the tip of the chip pocket part. The seat portion has an improved round insert including a cutter body in which a lower surface of the cutting insert is in close contact with the lower surface of the cutting insert, and a center portion of the lower surface includes a fastening screw hole for fastening a screw through the screw hole. Provide cutting tools.

As described above, according to the present invention, in a cutting tool for cutting by mounting a cutting insert having a cylindrical or conical shape to the cutter body, such as plane processing, side processing, groove processing, beveling processing, curved surface processing, etc. When performing high speed, high feed, and high cutting in various processing, the surface finish of the workpiece is excellent, and the cutting chip is separated to prevent damage to the cutting insert by the chip, to smooth the discharge of the cutting chip, and to reduce the cutting resistance. As a result, the life of the cutting tool is improved, and the cutting insert is securely settled in the seat of the cutter body.In order to improve productivity, the surface roughness of the workpiece can be obtained without decreasing the surface roughness of the workpiece even when the cutting tool is increased. Can be.

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

1 is an exploded perspective view showing an exploded view of a cutting tool having an improved round insert according to the present invention.

Referring to Figure 1, the cutting tool 100 having an improved circular cutting insert according to the present invention is a cutting insert 110, a cutting insert (100) is produced through a process such as powder metallurgy, that is, mold pressure, sintering, etc. The cutter body 140 in which the 110 is placed, and the screw 160 for fixing the cutting insert 110 to the cutter body 140 is provided.

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

2 to 5, the cutting insert 110 has a circular upper surface 112, a lower surface 114, and a side portion 116 connecting the upper surface 112 and the lower surface 114, The screw hole 118 is formed in the center portion of the upper surface 112 to the lower surface 114 to allow the screw 150 to pass therethrough.

The upper surface 112 is formed on the cutting edge 120 and the cutting edge 120 formed in the peripheral portion that meets the side portion 116, extending from the cutting edge 120 to the screw hole 118 to the inside of the upper surface 112 It is provided with one or more grooved cutting edges 122 formed concave and formed radially. As such, the grooved cutting edge 122 is formed as close to the straight line when the cutting insert 110, as anyone can see, widen the contact with the machining surface to determine the machining surface roughness when performing the cutting process That is, the groove-type cutting blade 122 serves as a normal sub-cutting blade. To this end, the groove-type cutting blade 122 is formed on the upper surface 112 to form a constant angle (θ) while having a constant width (W). At this time, the width (W) of the groove-type cutting edge 122 is related to the feed amount of one cutting insert 110 is applied when the cutting process and the number of cutting inserts 110 seated on the cutter body 140, Basically, it is formed larger than the product of the feed amount of one cutting insert 110 and the number of cutting inserts 110 mounted on the cutter body 140. That is, the groove cutting edge 122 has a width (W) of 0.5 ~ 2.0mm. Appropriately, the grooved cutting edge 122 preferably has a width W of 0.8 to 1.4 mm. In addition, the interval between the grooved cutting edge 122 is formed to have a range of 15 ~ 90 ° around the cutting insert 110 to form 4 to 24 grooved cutting edge (122). Preferably, the grooved cutting edge 122 is preferably formed to have a range of 22.5 to 45 ° to form 4 to 16 grooved cutting edges 122. More preferably, the grooved cutting edge 122 has a predetermined depth h inside the upper surface 112 so as to determine the surface roughness of the cutting process and to smoothly separate and discharge the generated cutting chips. And a curve having a constant radius r. At this time, the groove cutting edge 122 has a radius (r) of 0.5 ~ 5.0mm and a depth (h) of 0.05 ~ 2.5mm. Preferably, the groove cutting edge 122 is preferably formed to have a depth h of 0.08 to 1.5 mm while having a radius of curvature r of 0.8 to 3.0 mm.

On the other hand, the side portion 116 has a first side surface 124, the second side surface 126 and the concave-convex side surface (128). The first side marginal surface 124 extends with a predetermined inclination angle δ1 so as to be radially narrowed from the cutting edge 120 and the grooved cutting edge 122 toward the lower surface 114. At this time, the first side surface 124 has an inclination angle (δ1) of 0 ~ 30 °. The second side marginal surface 126 extends radially narrow from the extended end of the first side marginal surface 124 toward the lower surface 114. At this time, the second side marginal surface 126 has an inclination angle δ2 greater than the inclination angle δ1 of the first side marginal surface 124. On the other hand, the uneven side surface 128 is formed to extend vertically from the extending end of the second side marginal surface 126 to the lower surface (114). On the circumferential surface of the concave-convex side surface 128, a plurality of concave-convex grooves 130 curved inwardly of the concave-convex side surface 128 are formed at equal intervals. On the circumferential surface of the uneven side surface 128, 4 to 24 uneven grooves 130 are formed and provided in the same number as the grooved cutting edge 122. Preferably, the uneven side surface 128 has a thickness of 1/5 to 4/5 of the thickness of the cutting insert 110. More preferably, the side portion 116 may be formed of only the first side clearance surface 124 having an inclination angle δ1 of 0 to 30 ° to have a conical shape narrowing downward.

FIG. 6 is an enlarged perspective view illustrating an enlarged sheet part of the cutter body illustrated in FIG. 1, and FIG. 7 is a perspective view illustrating a cutting insert coupled to the cutter body illustrated in FIG. 1, and FIG. 8 is illustrated in FIG. 7. 9 is a plan view illustrating a cutting insert coupled to a cutter body, and FIG. 9 is a front view illustrating a cutting insert coupled to a cutter body illustrated in FIG. 7.

6 to 9 again, the cutter body 140 has at least one chip pocket portion 142 formed on the circumferential surface so as to smoothly discharge the chip discharged during the cutting process. The tip portion of the chip pocket 142 is formed so that the sheet portion 144 is settled so that the cutting insert 110 can be placed. At this time, the seat portion 144 is provided with a settled surface 146 is in close contact with the lower surface 114 of the cutting insert 110. A fastening screw hole 148 through which the screw 150 penetrates the screw hole 118 is formed in the center portion of the settled surface 146, and the cutting insert 110 is formed at one side of the settled surface 146. The front opening part 150 is formed to be exposed to the outside of the part 144 to perform a cutting operation, and the cutting insert 110 may be smoothly placed on the other side corresponding to the front opening part 150. A first seating surface 152, a second seating surface 154, and a third seating surface 156 having curvatures corresponding to 110 are formed. At this time, the first seating surface 152 extends from the chip pocket portion 142 to the seating surface 146 side of the seat portion 144 so that the first side marginal surface 124 is in close contact with the front opening 150. It is formed to have the same inclination as the first side surface 124, the second seating surface 154 is inclined larger than the inclination of the first seating surface 152 at the extended end of the first seating surface 152. It is formed extending to the front opening 150 side. At this time, the second seating surface 154 is formed so as not to interfere with the second side marginal surface 126. On the other hand, the third seating surface 156 extends from the extended end of the second seating surface 154 to the seating surface 146 while having a shape corresponding to the uneven side surface 128 so that the uneven side surface 128 can be in close contact. do. At this time, one or more protrusions 158 are formed to protrude toward the settled surface 146 so that the uneven groove 130 may be fitted on the third seating surface 156. Preferably, on the other side surface corresponding to the front opening 150 may be formed of only the first seating surface 152 extending from the chip pocket 142 to the seating surface 146 of the seat portion 144. Preferably, the abutment surface 152 has an angle β of 0 to 15 ° with respect to the central axis of rotation of the cutter body 140 and +5 to 10 ° with respect to the radial axis of the cutter body 140. Is formed at an angle γ.

The following briefly describes the engagement of the cutting tool 100 with the improved circular insert formed as described above.

First, in order to mount the cutting insert 110 to the cutter body 140, the cutting insert 110 is placed under the state in which the lower surface 114 of the cutting insert 110 is placed on the seating surface 146 of the seat portion 144. The concave-convex groove 130 formed on the concave-convex side surface 128 of the 110 is inserted into the concave-convex protrusion 158 formed on the third seating surface 156. As such, when the cutting insert 110 is placed on the settled surface 146, the screw 160 passes through the screw hole 118, and then the fastened screw hole formed in the settled surface 146 is formed. 148 to attach the cutting insert 110 to the seat portion 144. When the screw 160 is fastened to the fastening screw hole 148 in this way, the first side free surface 124 is tightly supported by the first seating surface 152 to form a supporting surface, and the uneven side surface 128 is a third While being tightly supported by the seating surface 156, the rotation is prevented by the uneven protrusion 158 inserted into the uneven groove 130, and another support surface is formed. At this time, the uneven groove 130 may increase the clamping force by increasing the surface contact portion with the uneven protrusion 158.

As such, the cutting insert 110 is mounted on the cutter body 140 to perform the cutting process. When the cutting edge 120 is blunted by the cutting process, the screw 160 is released to remove the unused cutting insert 110. In the state in which the cutting edge 120 is exposed to the front opening 150 side, the cutting blade 120 is fastened again, and then cutting is performed.

The cutting insert 110 and the cutter body 140 equipped with the cutting insert 110 according to the present invention can be applied to various cutting methods, and are capable of good cutting at high speed, high feed, and high cutting, Excellent surface roughness of the workpiece can be obtained even with various cutting speeds, feed rates, and depths of cut.

As described above, the cutting tool 100 having the improved circular insert according to the present invention forms one or more grooved cutting edges 122 on the upper surface 112 of the cutting insert 110, thereby providing a grooved cutting edge ( 122) The contact surface can be widened to improve the surface roughness of the workpiece in various processing such as flat, side, grooving and beveling and curved processing. There is an advantage that the surface roughness can be made good.

In addition, by forming at least one groove-shaped cutting edge 122, even if the cutting chip generated during the cutting process smoothly discharged and the feed amount is further increased, the machining surface roughness does not decrease and can perform a stable cutting process There is an advantage.

Meanwhile, the cutting insert 110 is formed by forming one or more uneven grooves 130 on the uneven side surface 128 and forming one or more uneven protrusions 158 inserted into the uneven grooves 130 on the third seating surface 156. The seat body 144 of the cutter body 140 can be securely seated, and the cutting insert 110 can be prevented from being rotated or moved due to the cutting load when cutting, and the cutting insert 110 is repeated. Even if exchanged, it can always be seated in the same position, so that not only stable cutting can be performed in various cutting processes such as plane, side, groove, slope, and curved machining, but also it can improve machining precision.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims. You will understand.

Claims (12)

A circular upper surface, a lower surface, and a side portion connecting the upper surface and the lower surface, and a screw hole is formed in the central portion of the upper surface to the lower surface so that the screw can pass therethrough, and meets the side surface. A cutting insert having a cutting edge formed at a periphery of the upper surface and at least one grooved cutting edge formed radially on the upper surface; And At least one chip pocket portion is formed on the circumferential surface so as to smoothly discharge the chip discharged during the cutting process, the tip portion of the chip pocket portion is formed so that the sheet portion is settled so that the cutting insert is settled, A seat body is formed in the seat portion, the lower surface of the cutting insert is in close contact with the center portion of the settle surface, characterized in that it comprises a cutter body is formed with a fastening screw hole is fastened to the screw through the screw hole Cutting tool with improved round insert. According to claim 1, wherein the groove-shaped cutting edge is formed extending from the cutting edge to the screw hole and has a width (W) of 0.5 ~ 2.0㎜ to improve the surface roughness when performing the cutting process Cutting tool with improved round insert. The cutting tool according to claim 1 or 2, wherein the grooved cutting edges are formed in the range of 4 to 24 in the range of 15 to 90 degrees with respect to the cutting insert. According to claim 1 or claim 2, wherein the groove-shaped cutting edge of 0.05 ~ 2.5mm to the inside of the upper surface to determine the surface roughness when performing the cutting process and to smoothly separate and discharge the generated cutting chips Cutting tool having an improved circular insert, characterized in that it is formed in depth. The cutting tool according to claim 1 or 2, wherein the grooved cutting edge has a curved radius of 0.5 to 5.0 mm so as to be curved inwardly of the upper surface. 2. The surface of claim 1, wherein the side surface portion has a first side marginal surface extending with a predetermined inclination angle δ1 so as to be radially narrowed toward the lower surface side from the cutting edge and the grooved cutting edge, and an extension of the first side marginal surface. And a second side marginal surface extending radially from the end to the lower surface side, and an uneven side surface extending vertically from the extended end of the second side marginal surface to the lower surface, wherein the uneven side is an inner side of the uneven side surface. Cutting tool having an improved circular insert, characterized in that formed by forming a plurality of uneven grooves bent at equal intervals. 7. The inclined angle δ2 of claim 6, wherein the first side marginal surface has an inclination angle δ1 of 0 to 30 °, and the second side marginal surface is greater than the inclination angle δ1 of the first side marginal surface. Cutting tool having an improved round insert, characterized in that having a. The method of claim 6, wherein the concave-convex side surface is formed to have a thickness of 1/5 ~ 4/5 ratio with respect to the thickness of the cutting insert, the concave-convex groove is formed in the same number as the groove-shaped cutting edge Cutting tool with improved round insert. The chip breaker of claim 6, wherein a front opening is formed at one side of the settled surface so that the cutting insert is exposed to the outside of the seat to perform a cutting operation, and the chip breaker is formed on the other side corresponding to the front opening. A first seating surface extending toward the settling surface side to which the first side marginal surface is in close contact, a second seating surface formed at an extended end of the first seating surface and not interfering with the second side marginal surface; 2 and a third seating surface in which at least one uneven protrusion protrudes toward the seating surface so that the recessed and recessed groove can be fitted on the inner side while being in close contact with the uneven side while extending from the extended end of the seating surface to the seating surface. Cutting tool with improved round insert. 7. The inclined angle δ1 of claim 6, wherein the side portion has a cylindrical or conical shape so as to be radially narrowed toward the lower surface side from the cutting edge and the grooved cutting edge. A cutting tool having an improved circular insert, characterized in that the branch can be formed only by the first side clearance surface. The method according to claim 9 or 10, wherein the first side free surface extending from the chip breaker to the settle surface side on the other side surface of the settled surface having any one of the cylindrical or the conical shape is in close contact. Cutting tool having an improved circular insert, characterized in that it can be formed only of the first seating surface having the same slope as the inclination angle (δ1) of the first side marginal surface. 2. The seating surface of claim 1, wherein the seating surface has an angle β of 0 to 15 degrees with respect to the central axis of rotation of the cutter body, and +5 to 10 degrees with respect to the radial axis of the cutter body. Cutting tool with an improved circular insert, characterized in that it is formed at an angle (γ).

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