KR20140014960A - Cutting tool for cutting hole edge part - Google Patents

Cutting tool for cutting hole edge part Download PDF

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Publication number
KR20140014960A
KR20140014960A KR1020120082430A KR20120082430A KR20140014960A KR 20140014960 A KR20140014960 A KR 20140014960A KR 1020120082430 A KR1020120082430 A KR 1020120082430A KR 20120082430 A KR20120082430 A KR 20120082430A KR 20140014960 A KR20140014960 A KR 20140014960A
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KR
South Korea
Prior art keywords
cutting
hole
hole center
center holding
edge
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Application number
KR1020120082430A
Other languages
Korean (ko)
Inventor
류공석
Original Assignee
현대중공업 주식회사
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Priority to KR1020120082430A priority Critical patent/KR20140014960A/en
Publication of KR20140014960A publication Critical patent/KR20140014960A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/12—Cutters specially designed for producing particular profiles
    • B23C5/14—Cutters specially designed for producing particular profiles essentially comprising curves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/04—Angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/084—Curved cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/24—Overall form of the milling cutter
    • B23C2210/242—Form tools, i.e. cutting edges profiles to generate a particular form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/40—Flutes, i.e. chip conveying grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2270/00—Details of milling machines, milling processes or milling tools not otherwise provided for
    • B23C2270/20—Milling external areas of components

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

The present invention relates to a cutting tool for cutting the edge of a hole. The cutting tool comprises: a connection shaft (10) formed of a vertical structure and connected to a shaft rotating device (Not shown) rotated at high speeds; a body part (20) arranged at the bottom of the connection shaft (10); a cutting part (30) arranged at the bottom of the body part (20) and formed of a pair of cutting blades (31) and a pair of cutting passages (32); a hole center maintaining part (40) arranged at the bottom of the cutting part (30); a hole entrance guide part (50) arranged at the bottom of the hole center maintaining part (40); and a pair of chip discharging passages (60) arranged close to the pair of cutting blades (31) of the cutting part (30) to discharge upward cut chips. Especially, the outer diameter of the hole center maintaining part right under the cutting part is minutely and gradually narrowed downward from the top. Thus, the present invention can drastically reduce work time and the number of processes to improve workability by fundamentally processing the edge of a hole with a single cutting tool and can relieve the risk of safety accidents by removing an additional grinding process. Also, the present invention can stably maintain the entire balance of the cutting tool by being rotated in a state where the top of the hole center maintaining part is almost attached to the inner surface of the hole and the bottom thereof is minutely separated from the inner surface of the hole.

Description

Cutting tool for cutting hole edge part}

The present invention relates to a cutting tool for cutting edges of holes, and more particularly, a connecting shaft having a vertical structure connected to and fixed to a separate shaft rotating device that is rotated at high speed, a body portion disposed at a lower end of the connecting shaft, and the body. A cutting part disposed at the lower end of the part and having a cutting edge and a cutting path, a hole center holding part disposed at the lower end of the cutting part, a hole inlet guide part disposed at the lower end of the hole center holding part, and a cutting edge adjacent part of the cutting part By providing a chip discharge passage for discharging the chips cut and disposed upward in the upper part, the hole edge processing is basically possible with only a single cutting tool, and the work time and the process are greatly reduced, thereby improving workability. In addition, as the separate grinder operation is deleted, the risk of safety accident is also eliminated, and in particular, the hall center The part has an inclined surface structure where the outer circumferential surface diameter of the lower part of the cutting portion becomes narrower as it goes downward, so that the upper end of the hole center holding part is almost in close contact with the inner circumferential surface of the hole, and the lower end thereof is finely spaced from the inner circumferential surface of the hole so that the shaft rotation is performed. As a result, the present invention relates to a cutting tool for cutting hole edges, in which the balance of the entire cutting tool can be stably maintained.

In general, when a hole such as a patriarchal piece of holes is processed through, corners are formed at a portion forming a boundary between the upper end of the inner circumferential surface of the hole and the upper end of the hole.

Such edges are usually curved to prevent damage such as abrasion, etc., from being tied through the hole.

As an example, a schematic method of surface treatment of the upper edge of the hole of the prior art is performed by first manually cutting the upper edge of the patriarchal piece hole using a drill, and then performing a surface treatment with a baby grinder, and finally performing a paper work. The hole is made by selecting the surface through.

However, the conventional method of processing the corner edges of the hole has to be carried out because the first drill operation-> the second baby grinder operation-> the third paper operation must be performed separately, especially in the curvature process for the chief piece hole. It takes a lot of time and processes, as well as the possibility of safety accidents in the grinder work, etc. had problems.

The present invention has been made to solve the above problems, the connection shaft of the vertical structure that is fixed to the separate shaft rotation device that is rotated at high speed, the body portion disposed in the lower end of the connecting shaft, and disposed in the lower end of the body portion And a cutting part comprising a cutting edge and a cutting path, a hole center holding part disposed at a lower end of the cutting part, a hole inlet guide part disposed at a lower end of the hole center holding part, and a cutting edge adjacent to a cutting edge of the cutting part. By providing a chip discharge passage for discharging the chip upwards, it is possible to machine the hole edges with only a single cutting tool, and greatly reduce the work time and the process, thereby improving workability. Cutting for hole edge cutting, which eliminates the separate grinder work and eliminates the risk of safety accidents. The purpose is to provide a tool.

In addition, the hole center holding portion has an inclined surface structure in which the diameter of the outer circumferential surface of the lower part of the cutting portion becomes narrower toward the lower portion thereof, so that the upper end portion of the hole center holding portion is almost in close contact with the inner circumferential surface of the hole and the lower end thereof is finely spaced apart from the inner circumferential surface of the hole. It is another object of the present invention to provide a cutting tool for cutting hole edges such that rotation of the furnace shaft is performed, and as a result, the balance of the cutting tool as a whole can be stably maintained.

The cutting tool for cutting the hole edge of the present invention for achieving the above object is connected to the shaft connected to a separate shaft rotation device of the high-speed rotation shaft connected to the vertical structure; A body portion disposed at the lower end of the connecting shaft; A cutting part disposed at a lower end of the body part and including a cutting edge and a cutting path; A hole center holding part disposed at a lower end of the cutting part; A hole entry guide part disposed at a lower end of the hole center holding part; And a chip discharge passage disposed at an adjacent portion of the cutting edge of the cutting portion to discharge the cut chips upward.

In addition, in the cutting tool for cutting hole edges, which is an embodiment of the present invention, the hole center holding part may have an inclined surface structure in which the diameter of the outer circumferential surface of the lower part of the cutting portion becomes narrower toward the lower side.

In addition, in the cutting tool for cutting hole edges, which is an embodiment of the present invention, the upper and lower lengths extending downward from the outer circumferential surface of the cutting portion to the hole center holding portion and the hole inlet guide portion and upwardly extending to the body portion. The chip discharge passage is recessed with respect to the whole, and the chip discharge passage and the boundary between the chip discharge passage and the outer peripheral surface of the cutting portion become the cutting edge, and the remaining outer peripheral surface continuous from the cutting edge becomes the cutting passage. The hole center holding part may have a vertical length differently formed with respect to the circumferential direction.

In addition, in the cutting tool for cutting a hole edge of an embodiment of the present invention, the vertical length of the hole center holding portion has the longest vertical length of the hole center holding portion corresponding to the portion placed on the extension line of the cutting edge and the circumferential direction is the longest. It may be to narrow the narrower and to expand the upper and lower width of the axial rotation progress direction of the cutting passage located relatively above.

In addition, in the cutting tool for cutting hole edges in one embodiment of the present invention, the chip discharge passage including the cutting edge is made of a pair axially symmetrical with respect to the connecting shaft, the hole center holding portion is also a pair It consists of a pair symmetrical with each other with the chip discharge passage of the, each hole center holding portion has the longest vertical length of the hole center holding portion corresponding to the portion placed on the extension line of each cutting edge and the circumferential direction It may be to be narrowed toward the end to expand the upper and lower width of the axis rotation progress direction of the cutting passage located relatively above.

In addition, in the cutting tool for cutting a hole edge of an embodiment of the present invention, the upper and lower width length of the hole center holding portion is inclined downward toward the circumferential direction while the upper end of the hole center holding portion is kept horizontal The length of the upper and lower width of the hole center holding portion may be narrowed.

In addition, in the cutting tool for cutting the hole edge of an embodiment of the present invention, the slope of the inclined surface of the hole center holding portion may have an inclination angle within the range of 8 ~ 12 °.

As described above, the cutting tool for cutting corners of the hole of the present invention is connected to the shaft connected to a separate shaft rotating device of high-speed rotation, the vertical shaft, the body portion disposed on the lower end of the connecting shaft, the lower end of the body portion A cutting portion disposed at the cutting edge and a cutting passage, a hole center holding portion disposed at the lower end of the cutting portion, a hole inlet guide portion disposed at the lower end of the hole center holding portion, and a cutting edge adjacent to the cutting edge By providing a chip discharge passage for discharging the cut chip upwards, it is basically possible to machine the hole corners with only a single cutting tool, thereby significantly reducing work time and process, thereby improving workability. In addition, as the separate grinder work is deleted, the effect of safety accidents is also eliminated.

In addition, the hole center holding portion has an inclined surface structure in which the outer circumferential surface diameter of the lower portion of the cutting portion becomes narrower as it goes downward, so that the upper end portion of the hole center holding portion is almost in close contact with the inner circumferential surface of the hole, and the lower end thereof is finely spaced apart from the inner circumferential surface of the hole. As a result, the rotation of the furnace shaft is achieved, and as a result, the balance of the cutting tool as a whole can be stably maintained.

1 is a perspective view showing a cutting tool for cutting edges according to an embodiment of the present invention.
Figure 2 is a bottom perspective view showing a cutting tool for cutting edges according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing the main part of the trunk structure of the cutting tool for cutting edges according to an embodiment of the present invention.
Figure 4 is a schematic diagram showing the main part of the cut-out structure of the upper surface of the body portion of the cutting tool for cutting hole edges according to an embodiment of the present invention.
5 is a schematic view illustrating a main part of a cutting path structure of a cutting tool for cutting a hole edge according to an exemplary embodiment of the present invention.
Figure 6 is a schematic view showing the main portion of the hole center holding portion structure of the cutting tool for cutting edges according to an embodiment of the present invention.
7 is a schematic view illustrating main parts of a hole inlet guide part of a cutting tool for cutting edges according to an embodiment of the present invention.
8 is a bottom view illustrating a cutting tool for cutting edges according to an embodiment of the present invention.
9 is a schematic view showing a shape in which the cutting tool for cutting hole edges according to an embodiment of the present invention is developed along a circumferential direction.
10 is a schematic view showing a shape in which the cutting surface of the hole passes through the cutting passage in which the upper and lower widths are widened by the body portion of the cutting tool for cutting hole edges according to an embodiment of the present invention.
11 is a schematic diagram sequentially illustrating a process of processing a hole by the cutting tool for cutting hole edges according to an embodiment of the present invention.

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

As shown in Figures 1 to 11, the cutting tool for cutting hole edges in accordance with an embodiment of the present invention is connected to the shaft 10 of a separate shaft rotating device (not shown) is rotated at high speed (10) And, the body portion 20 is disposed on the lower end of the connecting shaft 10, the cutting portion 30 is disposed at the lower end of the body portion 20 and made of a cutting edge 31 and the cutting passage 32, Hole center holding portion 40 disposed at the lower end of the cutting portion 30, the hole entry guide portion 50 and the cutting edge of the cutting portion 30 disposed at the lower end of the hole center holding portion 40 (31) It has a structure including the chip discharge passageway 60 for discharging the chip | tip which was arrange | positioned at the adjacent part and upwards.

The connecting shaft 10 is integrally connected to the central portion of the upper surface of the body portion 20, the upper end of which extends a predetermined length in the form of a long cylindrical shape fixed in engagement with a separate axial rotation device, the outer peripheral surface The face cutting part 11 chamfered in a planar structure is provided over the whole up and down.

The body portion 20 is formed in a cylindrical shape extending radially from the lower end of the connecting shaft 10, the body portion 20 is formed differently with respect to the circumferential length of the upper and lower widths.

That is, the length of the upper and lower widths of the trunk portion 20 is relatively long as the length of the upper and lower widths of the trunk portion 20 corresponding to the portion placed on the extension line of the cutting edge 31 becomes narrower along the circumferential direction. The width of the up-and-down width of the cutting passage 32 located below is extended in the axial rotation advancing direction.

In more detail, the body portion 20 is composed of a pair of symmetrical with each other with the pair of chip discharge passage 60 between, each of the body portion 20 is the respective cutting The upper and lower widths of the trunk portion 20 corresponding to the portion placed on the extension line of the blade 31 are the longest and narrower along the circumferential direction, and the upper and lower widths of the cutting passage 32 are located relatively downwards. It is designed to expand the width.

The upper and lower widths of the trunk portion 20 are inclined upwardly along the circumferential direction of the upper and lower widths of the trunk portion 20 while the upper surface of the trunk portion 20 is horizontal. The structure becomes narrower.

In addition, the bottom of the cylindrical outer peripheral surface of the body portion 20 is the egg processing of the chief piece hole (hereinafter, referred to as a hole) 5 (the upper end of the inner peripheral surface 5a of the hole 5 and the upper surface of the hole 5) In order to prevent the top surface 5b from being damaged by cutting or the like by contacting the top surface 5b adjacent to the corner 5c of the hole 5 at the time of processing the curved surface 5c where the surface 5b meets. Cutting prevention structure is provided.

Here, the cutting prevention structure has an inclined surface 21 structure in which the boundary portion where the lower end of the outer circumferential surface of the body portion 20 and the bottom surface of the body portion 20 meet is chamfered.

The inclined surface 21 is formed over the entire boundary portion where the lower end of the outer circumferential surface of the body portion 20 and the bottom surface of the body portion 20 meet.

The cutting part 30 is an outer circumferential structure of a shape that becomes narrower from the lower end of the body portion 20 toward the lower side and then widens again at the lower end thereof, and the hole center holding part 40 and downward from the outer circumferential surface thereof. The chip discharge passage 60 extends up to the hole entry guide portion 50 and is concavely recessed with respect to the entire upper and lower lengths extending upwardly to the body portion 20, thereby forming the chip discharge passage 60. And a boundary portion between the outer peripheral surface of the cutting portion 30 and the cutting edge 31.

The outer peripheral surface continued from the cutting edge 31 is configured to have the cutting passage 32.

That is, the cutting portion 30 is a portion corresponding to the body portion 20 and the hole center holding portion 40 is the cutting portion 30.

In addition, the cutting part 30 is composed of a pair of symmetrical with each other with the pair of chip discharge passage 60 therebetween.

The cutting edge 31 of the cutting portion 30 has a curved structure corresponding to a curved structure in which the diameter narrows down toward the bottom from the lower end of the trunk portion 20 and then widens again at the lower end. .

In addition, the diameter length of the cutting passage 32 along the outer circumferential surface of the cutting portion 30 is formed differently.

That is, the cutting passage 32 has a structure in which the diameter length of the cutting passage 32 at the portion where the cutting edge 31 starts is the longest and the diameter length thereof decreases along the circumferential direction.

In more detail, the cutting passage 32 of the cutting portion 30 is a pair symmetrical with each other with a pair of chip discharge passages 60 axially symmetric with respect to the connection shaft 10. It is made, but the diameter length is also the structure that the length of the cutting edge 31 is the longest and the diameter length becomes smaller toward the circumferential direction.

In addition, the length of the upper and lower widths of the cutting passage 32 along the outer circumferential surface of the cutting portion 30 is formed differently in the circumferential direction.

That is, the vertical length of the cutting passage 32 has a structure in which the vertical length of the cutting passage 32 corresponding to the portion connected to the cutting edge 31 is the narrowest and widens along the circumferential direction.

In more detail, the cutting passage 32 of the cutting portion 30 is composed of a pair symmetrical with each other with a pair of chip discharge passage 60, the length of the upper and lower width of the cutting edge 31 ) Is the narrowest part, and the length of the upper and lower width becomes wider along the circumferential direction.

In addition, the upper and lower widths of the cutting passage 32 extend in the upper and lower portions of the cutting passage 32, respectively, and have a structure in which the upper and lower widths of the cutting passage 32 extend.

The hole center holding portion 40 has an inclined surface 41 structure in which the diameter of the outer peripheral surface of the lower portion of the cutting portion 30 is narrower toward the lower portion thereof.

The inclination of the inclined surface 41 with respect to the vertical direction of the hole center holding portion 40 has an inclination angle within a range of 8 to 12 degrees, and preferably has an inclination angle of 10 degrees.

Here, the diameter of the upper end portion of the hole center holding portion 40, that is, the lower end portion of the cutting portion 30 is inserted into the inner circumferential surface 5a of the hole 5 and is in close contact with the inner circumferential surface 5a. It has a diameter of about.

And, the hole center holding portion 40 is formed differently in the circumferential direction of the vertical length of the hole center.

That is, the vertical length of the hole center holding portion 40 is the longest vertical length of the hole center holding portion 40 corresponding to the portion placed on the extension line of the cutting edge 31 and the longer along the circumferential direction It becomes narrower and has a structure which expands the width | variety width of the axial rotation progress direction of the cutting path 32 located relatively upward.

In more detail, the hole center holding unit 40 is formed of a pair symmetrical with each other with the pair of chip discharge passages 60 therebetween, and each of the hole center holding units 40 Axial rotation of the cutting path 32 located relatively upward while the length of the upper and lower widths of the hole center holding portion 40 corresponding to the portion placed on the extension line of the cutting edge 31 is narrowest along the circumferential direction. It is designed to expand the width in the direction of travel.

Here, the upper and lower width lengths of the hole center holding portion 40 is inclined downward toward the circumferential direction while the lower end of the hole center holding portion 40 is horizontal, so that the hole center holding portion 40 It becomes the structure that narrows the length of the upper and lower width of).

The hole entry guide portion 50 has an inclined surface 51 structure in which the diameter of the outer circumferential surface of the lower portion of the hole center holding portion 40 immediately decreases downward.

That is, the hole entry guide part 50 is formed in a pair symmetrical with each other with the pair of chip discharge passages 60 interposed therebetween, and the inclined surface 51 with respect to the vertical direction of the hole entry guide part 50. ) The inclination has an inclination angle in the range of 40 to 50 degrees, and preferably has an inclination angle of 45 degrees.

The chip discharge passage 60 extends downward from the outer circumferential surface of the cutting portion 30 to the hole center holding portion 40 and the hole inlet guide portion 50 and upwards to the body portion 20. It is a concave concave structure with respect to the whole upper and lower length extended.

Here, the concave recessed shape has a concave groove structure rounded in a substantially half pipe (semi-circular tube) shape.

The chip discharge passage 60 is formed in a pair axially symmetric with respect to the connecting shaft 10, and the chip discharge passage 60 starts at the hole entry guide portion 50 to the hole center. The inclined structure is connected to the trunk portion 20 via the holding portion 40 and the cutting portion 30.

In addition, the inclination angle of the immersion discharge passage 60 is inclined in the range of 40 to 50 °, but preferably has an inclination angle of 45 °, and has a linear inclination structure inclined toward the cutting edge 31. .

Meanwhile, in the present invention, the shape of each component is defined on the basis that the cutting tool is axially rotated in the right-hand thread direction. On the contrary, when the cutting tool is to be axially rotated in the left-hand direction, the respective components are It will be apparent that by limiting the shape to the part in the opposite direction to be symmetrical, it becomes possible to have the same cutting function as the cutting in the right-hand direction.

Looking at the hole edge cutting process using a cutting tool for cutting the hole edge according to an embodiment of the present invention,

1) Hall entry stage

First, the inner circumferential portion of the hole 5 through the hole inlet guide portion 50 having a downwardly conical inclined surface structure of the cutting tool of the present invention, to which the connecting shaft 10 is fixedly connected by a predetermined shaft rotating device. Insert the cutting tool with

At this time, the cutting tool is lower than the inner circumferential surface 5a of the hole 5 by the inclined surface 51 even when the inclined surface 51 of the hole entry guide 50 is in contact with the upper edge 5c of the hole 5. It slides in and guides the cutting tool to enter smoothly downward.

The smooth insertion is continued and the cutting is caught at a point where a predetermined portion of the cutting edge 31 of the cutting portion 30 having a diameter larger than the diameter of the hole 5 meets the upper edge 5c of the hole 5. Entry into the inner circumference of the hole 5 of the tool is stopped.

At this time, the cutting edge 31 having a curved structure along the upper side has a shape covering the upper edge 5c of the inner circumferential surface 5a of the hole 5 and is ready to be cut.

On the other hand, the upper edge 5c of the hole 5 which is in contact with the cutting edge 31 is the cutting surface.

2) cutting steps

In this state, when the cutting tool is rotated at a high speed in the right direction through a predetermined shaft rotating device, the cutting edge 31 is rotated at a high speed while the upper end of the inner circumferential surface of the hole 5 which is in contact with the cutting edge 31. The edge 5c is cut off.

In the cutting process of the hole edge 5c, the cutting edge 31 performs cutting in the rotational direction in which the cutting edge 31 is rotated at high speed, and downward pressure is added to the cutting tool, thereby cutting the corresponding hole 5. As the surface gradually meets the upper large diameter portion of the cutting edge 31, the cutting cross-sectional area of the hole edge 5c is gradually increased.

Here, since the cutting edge 31 has a structure (torsion angle) inclined at a predetermined angle with respect to the corresponding cutting portion of the hole edge 5c, the size of the cross-sectional area in contact with the cutting portion at the beginning of cutting is The small cutting edge and the cutting edge gradually increase as the cutting progresses, thus reducing the initial impact and gradually increasing the cutting load. As a result, the cutting performance is improved, the noise is reduced, and the wear on the cutting edge is also reduced. Will be reduced.

3) Hall center maintenance step

On the other hand, while cutting the hole edge 5c by the cutting edge 31, the cutting edge 31 by the hole center holding portion 40 is able to perform accurate cutting in the correct position.

That is, the upper end portion of the outer circumferential surface of the hole center holding portion 40 is disposed close enough to the hole inner circumferential surface 5a, and the cutting tool is rotated at a high speed by the inclined surface 41 narrowing downward. The center of the hole is not kept in the state in which the hole center holding part 40 maintains a minute gap on the inner circumferential surface 5a of the hole, thereby enabling stable and accurate high speed shaft rotation.

4) Prevention of interference between cutting path and inner circumference of hole

And while cutting the hole edge 5c while the cutting edge 31 is rotated at high speed, the corresponding cutting portion of the hole edge 5c is cut along the rear circumferential direction of the cutting edge 31. As the circumferential direction increases, the upper and lower widths thereof become larger and their diameters become smaller, so that no interference between the cutting passage 32 and the corresponding cutting portions of the holes 5 is generated and smooth cutting is performed.

 5) Chip discharge step

On the other hand, the chip generated in the cutting process of the hole edge (5c) by the cutting edge 31 is discharged upward of the cutting tool through the chip discharge passage 60 recessed in front of the cutting edge 31. .

Here, in a schematic view of the principle that the chip is discharged upward of the cutting tool, the shape of the cutting edge 31 toward the hole edge (5c) is the upper end of the back and the lower end of the forward The chip discharge passage 60 is also disposed to have the same inclination angle, so that the chip and the lower end of the chip discharge passage 60 meet first, and the chip discharge passage is stepwise. The chip is discharged upward along the inclined surface of the chip discharge passage 60 as a result of the lead to the upper end of the (60).

6) Prevent contact between body and hole

Then, when the downward entry of the cutting edge 31 is almost completed so that the trunk portion 20 of the upper end thereof is almost in close contact with the upper end surface 5b of the hole, the cutting operation for the hole edge 5c is completed. In this case, the lower edge of the body portion 20 is prevented from contacting the upper end surface 5b of the hole by the inclined surface 21 of the lower edge of the body portion 20, and thus the upper end surface 5b of the body portion 20 As the cutting of the cutting edge is blocked in advance, the risk of damage to the hole upper surface 5b is eliminated.

As such, the cutting tool of the present invention is stably entered into the inner periphery of the hole 5 through the hole inlet guide part 50, and then rotates the cutting edge 31 at high speed while downwardly cutting the cutting tool. The pressing force is added to the cutting operation on the hole edge (5c) is carried out, through the hole center holding portion 40 to maintain a stable balance of the cutting tool through the cutting passage 32, By enabling the smooth shaft rotation without interference with the corresponding cutting surface of the hole edge (5c), it is possible to discharge the chip generated during the cutting operation upward through the chip discharge passage 60, cutting operation At this time, the upper end surface 5b of the hole 20 is prevented from being cut by the inclined surface 21 of the trunk portion 20, thereby finally cutting the hole upper edge.

As described above, the cutting tool for cutting the edge of the hole according to an embodiment of the present invention is connected to the shaft connected to a separate shaft rotation device is fixed to the high-speed shaft rotation, the body portion disposed on the lower end of the connecting shaft, A cutting part disposed at a lower end of the body part and having a cutting edge and a cutting path, a hole center holding part disposed at the lower end of the cutting part, a hole inlet guide part disposed at the lower end of the hole center holding part, and a cutting edge adjacent to the cutting part By providing a chip discharge path for discharging the chip which is disposed in the upper part and cutting upwards, it is possible to machine the hole edges with only a single cutting tool, and the work time and the process are greatly reduced, thereby improving workability. In addition, the separate grinder work is deleted, so that the risk of safety accidents are eliminated, in particular, the Holsen The retaining portion has an inclined surface structure in which the outer peripheral surface diameter of the lower portion of the cutting portion becomes narrower toward the lower portion thereof, whereby the upper end portion of the hole center holding portion is almost in close contact with the inner circumferential surface of the hole, and the lower end portion thereof is axially rotated to be spaced finely from the inner peripheral surface of the hole. As a result, the balance of the cutting tool as a whole can be stably maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It should be understood that all of the techniques that can be easily changed and used by those skilled in the art are included in the technical scope of the present invention.

DESCRIPTION OF REFERENCE NUMERALS
5: hole 5a: inner circumference
5b: Top face 5c: Corner
10: connecting shaft 20: body
21: slope 30: cutting portion
31: cutting edge 32: cutting path
40: hall center holding portion 41: inclined surface
50: hole entry guide portion 51: inclined surface
60: chip discharge passage

Claims (6)

A connecting shaft having a vertical structure fixed to a separate shaft rotating device which is rotated at a high speed;
A body portion disposed at the lower end of the connecting shaft;
A cutting part disposed at a lower end of the body part and including a cutting edge and a cutting path;
A hole center holding part disposed at a lower end of the cutting part;
A hole entry guide part disposed at a lower end of the hole center holding part; And
A chip discharge passage disposed at an adjacent portion of the cutting edge of the cutting unit to discharge the cut chips upward;
And,
The hole center holding part is a cutting tool for cutting the edge of the hole, characterized in that the inclined surface structure of the outer peripheral surface diameter of the lower portion of the cutting portion becomes narrow narrower toward the lower portion. The method of claim 1,
From the outer circumferential surface of the cutting portion downwardly extends to the hole center holding portion and the hole entry guide portion and upwardly and concavely over the entire length of the upper and lower lengths extending to the body portion, the chip discharge passage,
The boundary between the chip discharge passageway and the outer peripheral surface of the cutting portion becomes the cutting edge,
The remaining outer circumferential surface continuous from the cutting edge becomes the cutting passage,
The hole center holding portion is a cutting tool for cutting edges, characterized in that the upper and lower width length is formed differently in the circumferential direction. 3. The method of claim 2,
The length of the upper and lower widths of the hole center holding portion is the longest vertical length of the hole center holding portion corresponding to the portion placed on the extension line of the cutting edge, and narrows along the circumferential direction and progresses in the axis rotation of the cutting passage located relatively upward. Cutting tool for cutting edges of holes, characterized in that to extend the width in the vertical direction. The method of claim 3,
Chip discharge passage including the cutting edge is made of a pair axially symmetric with respect to the connecting shaft,
The hole center holding unit is also made of a pair symmetrical with each other with the pair of chip discharge passage,
Each of the hole center holding portions has the longest vertical length of the hole center holding portion corresponding to the portion placed on the extension line of each cutting edge, and the shaft rotation of the cutting passage located relatively upwardly becomes narrower along the circumferential direction. The cutting tool for cutting edges of holes, characterized in that to extend the upper and lower width of the moving direction. 5. The method of claim 4,
The upper and lower widths of the hole center holding unit are characterized in that the upper and lower widths of the hole center holding unit are inclined downward in the circumferential direction while the lower end of the hole center holding unit is horizontal, and the upper and lower widths of the hole center holding unit are narrowed. Cutting tool for cutting edges. The method of claim 1,
The inclined plane inclination of the hole center holding portion is a cutting tool for cutting edges, characterized in that it has an inclination angle in the range of 8 ~ 12 °.
KR1020120082430A 2012-07-27 2012-07-27 Cutting tool for cutting hole edge part KR20140014960A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105880704A (en) * 2016-05-12 2016-08-24 安庆中船动力配套有限公司 Special cutter for tapered surface of exhausting flange of cylinder cover

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105880704A (en) * 2016-05-12 2016-08-24 安庆中船动力配套有限公司 Special cutter for tapered surface of exhausting flange of cylinder cover

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