KR101164751B1 - Cutting tool assembly - Google Patents
Cutting tool assembly Download PDFInfo
- Publication number
- KR101164751B1 KR101164751B1 KR20100100696A KR20100100696A KR101164751B1 KR 101164751 B1 KR101164751 B1 KR 101164751B1 KR 20100100696 A KR20100100696 A KR 20100100696A KR 20100100696 A KR20100100696 A KR 20100100696A KR 101164751 B1 KR101164751 B1 KR 101164751B1
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- KR
- South Korea
- Prior art keywords
- cutting
- head member
- cutting head
- shank
- tool holder
- Prior art date
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The cutting tool assembly according to the present invention includes a cutting head member having a cutting portion, a tool holder for supporting the cutting head member, and a fastening member for interconnecting the cutting head member and the tool holder. The cutting head member includes a cutting portion formed at the front end to perform cutting, a shank portion formed at the rear end and inserted into the tool holder, and an intermediate portion connecting the cutting portion and the shank portion. The shank portion of the cutting head member includes a truncated cone-shaped portion formed to narrow in the axial direction from the middle portion to the rear, and a cylindrical portion formed in a cylindrical shape in the axial direction at the rear end portion. The shank portion of the cutting head member is provided with a female screw portion for accommodating the first male screw portion of the fastening member along the axial direction at the center portion. The tool holder has a truncated cone-shaped opening formed at the front end to receive the truncated cone portion of the shank portion of the cutting head member, a cylindrical bore portion formed inside the truncated cone shape to accommodate the cylindrical portion of the cutting head member, and a cylindrical bore. And a through hole formed along the axial direction with a diameter smaller than the diameter of the portion. The through hole of the tool holder is provided with a female thread portion for accommodating the second male thread portion of the fastening member along the axial direction at the front end thereof. The fastening member has a first male screw portion for screwing with a female screw portion formed at the shank portion of the cutting head member at one end thereof, and a second male screw portion screwed with a female screw portion formed at the through hole of the tool holder at the other end portion thereof. have. In the cutting tool assembly according to the present invention, in the assembled state, the truncated cone-shaped portion of the shank portion of the cutting head member contacts the truncated cone-shaped opening of the tool holder, and the cylindrical portion of the shank portion of the cutting head member has a cylindrical bore portion of the tool holder. Configured to contact. Further, the cutting portion of the cutting head member of the cutting tool assembly according to the present invention is formed of cemented carbide material, and the shank portion of the cutting head member is formed of steel.
Description
The present invention relates to a cutting tool assembly for cutting a workpiece. More specifically, the present invention relates to a cutting tool assembly capable of replacing a cutting head member having a cutting portion for cutting a workpiece.
The cutting portion of the cutting tool is typically formed of a material of high strength, such as cemented carbide, to cut the metal workpiece. In manufacturing a cutting tool, even if the non-cutting portion that does not perform the cutting process is formed of a high-strength material integrally with the cutting portion, the expensive high-strength material is used unnecessarily a lot, thereby increasing the manufacturing cost of the tool. Its high strength makes it difficult to manufacture cutting tools. In addition, since the cutting tool formed integrally in this way has to replace the cutting tool as a whole when the cutting portion wears out, the tool replacement cost is consumed a lot and it is not economical.
In order to solve this problem, a cutting tool assembly in which a cutting head member having a cutting portion and a tool holder for supporting the same are separately manufactured and then assembled and used are used. 7 illustrates a conventional
This conventional
Moreover, the
The present invention solves the above-mentioned problems of the conventional cutting tool assembly which can replace the cutting head, thereby improving the contact supporting force between the cutting head member and the tool holder, making it easier to manufacture while supporting the cutting head member more firmly. It is an object of the present invention to provide a cutting tool assembly that can.
The cutting tool assembly according to the present invention includes a cutting head member having a cutting portion, a tool holder for supporting the cutting head member, and a fastening member for interconnecting the cutting head member and the tool holder.
The cutting head member includes a cutting portion formed at the front end to perform cutting, a shank portion formed at the rear end and inserted into the tool holder, and an intermediate portion connecting the cutting portion and the shank portion. The shank portion of the cutting head member includes a truncated cone-shaped portion formed to narrow in the axial direction from the middle portion to the rear, and a cylindrical portion formed in a cylindrical shape in the axial direction at the rear end portion. The shank portion of the cutting head member is provided with a female screw portion for accommodating the first male screw portion of the fastening member along the axial direction at the center portion.
The tool holder has a truncated cone-shaped opening formed at the front end to receive the truncated cone portion of the shank portion of the cutting head member, a cylindrical bore portion formed inside the truncated cone shape to accommodate the cylindrical portion of the cutting head member, and a cylindrical bore. And a through hole formed along the axial direction with a diameter smaller than the diameter of the portion. The through hole of the tool holder is provided with a female thread portion for accommodating the second male thread portion of the fastening member along the axial direction at the front end thereof.
The fastening member has a first male screw portion for screwing with a female screw portion formed at the shank portion of the cutting head member at one end thereof, and a second male screw portion screwed with a female screw portion formed at the through hole of the tool holder at the other end portion thereof. have.
In the cutting tool assembly according to the present invention, in the assembled state, the truncated cone-shaped portion of the shank portion of the cutting head member contacts the truncated cone-shaped opening of the tool holder, and the cylindrical portion of the shank portion of the cutting head member has a cylindrical bore portion of the tool holder. Configured to contact.
Further, the cutting portion of the cutting head member of the cutting tool assembly according to the present invention is formed of a cemented carbide material such as tungsten, and the shank portion of the cutting head member is formed of steel.
Cutting tool assembly according to an embodiment of the present invention, preferably, the outer diameter of the first male screw portion of the fastening member screwed to the female thread formed on the shank portion of the cutting head member and the cylindrical portion of the shank portion of the cutting head member The thickness between outer diameters is larger than 0.05 times the outer diameter of the cylindrical portion of the shank portion, and smaller than 0.2 times the outer diameter of the cylindrical portion of the shank portion.
The cutting tool assembly according to another embodiment of the present invention preferably has a straight line in which the rod flank of the screw engaging portion, in which the female screw portion formed in the shank portion of the cutting head member and the first male screw portion of the fastening member, is screwed, is perpendicular to the axial direction. And 30 degrees to 50 degrees.
Further, in the cutting tool assembly according to another embodiment of the present invention, the axial length of the intermediate portion of the cutting head member is formed to be larger than 0.1 times the outer diameter of the cutting portion.
The cutting tool assembly according to the present invention is formed by dividing the shape of the shank portion of the cutting head member into a truncated cone shape and a cylindrical shape so as to be accommodated in each of the truncated cone-shaped opening and the cylindrical bore of the tool holder, thereby the cutting tool assembly is assembled. When the cutting head member and the tool holder are contacted at both ends of the shank portion, the cutting head member can be supported more firmly.
In addition, in the cutting tool assembly according to the present invention, the cutting portion to perform the cutting process is formed of a high-strength hard material such as tungsten, and the shank portion that does not perform the cutting process is made of ordinary steel of lower strength By forming, the shape of the shank portion can be easily machined while providing the cutting portion with sufficient strength to machine the metal material. In addition, since the cutting tool assembly according to the present invention forms the shank portion for expansion coupling with the tool holder, the shank portion can be expanded more easily, so that the shank portion and the tool holder have a more firm contact bearing force. Can be provided.
Furthermore, a cutting tool assembly according to the present invention is provided between an outer diameter of a first male threaded portion of a fastening member screwed with a female threaded portion formed on the shank portion of the cutting head member, and an outer diameter of the cylindrical portion of the shank portion of the cutting head member. By forming the thickness smaller than 0.2 times the outer diameter of the cylindrical portion of the shank portion, the shank portion of the cutting head member can be more easily expanded and coupled with the tool holder.
In addition, the cutting tool assembly according to the present invention is a straight line in which the rod flank of the screw coupling portion to which the female screw portion formed in the shank portion of the cutting head member and the first male screw portion of the fastening member is screwed is perpendicular to the axial direction, and is 30 degrees to 50 degrees. By forming at an angle of view, the shank portion of the cutting head member can be expanded and coupled with the tool holder more easily.
Further, in the cutting tool assembly according to the present invention, the axial length of the intermediate portion of the cutting head member is formed to be larger than 0.1 times the outer diameter of the cutting portion of the cutting head member, thereby precisely performing diffusion bonding of the cutting portion and the shank portion. It is possible to form the cutting portion and the shank portion of different materials.
1 is an exploded perspective view of a cutting tool assembly according to the present invention.
2 and 3 show a cross sectional view of the cutting tool assembly according to the invention in an assembled state.
4 shows a cross section of a threaded portion between a cutting head member and a fastening member of a cutting tool assembly according to the invention.
5 illustrates a screwed state of the cutting head member and the fastening member of the cutting tool assembly according to an embodiment of the present invention.
6A and 6B are cross-sectional views illustrating a state in which a cutting head member and a fastening member are assembled in a cutting tool assembly according to an embodiment of the present invention.
7 is a cross-sectional view showing a conventional cutting tool assembly capable of replacing a cutting head member having a cutting portion formed thereon.
Hereinafter, the
1 is an exploded perspective view of a
The
One end of the
The
The
On the other hand, at the front end of the through
The
4 shows a cross-section of the cutting
5 shows that the
6A and 6B show a state in which the cutting
The above-described embodiments of the present invention are presented for illustrative purposes only and do not limit or limit the present invention. Those skilled in the art may apply various modifications and modifications to the present invention without departing from the scope of the present invention.
10: cutting head member
20 tool holder
21: opening of the cone shape
22: cylindrical bore
23: through hole
24: female thread
30: fastening member
31: first male thread portion of the fastening member
31a: Rod flank contact surface of the male thread formed on the fastening member
32: second male thread portion of the fastening member
40: cutting part
50: shank part
51: cone shape
52: cylindrical shape
53: female thread
53a: rod flank contact surface of female thread formed on shank
60: middle part
A: axial length of the middle part
T: thickness of the cylindrical portion of the shank portion
D1: outer diameter of cutting part
D2: outer diameter of the cylindrical portion of the shank portion
Claims (4)
The cutting head member may include a cutting portion of a cemented carbide material formed at a front end to perform cutting, an intermediate shank portion formed at a rear end to be inserted into a tool holder, and an intermediate portion connecting the cutting part and the shank part. Including wealth,
The shank portion of the cutting head member includes a truncated cone-shaped portion formed to narrow in the axial direction from the middle portion to the rear, and a cylindrical portion formed in a cylindrical shape in the axial direction at the rear end portion, A female screw portion for receiving the first male screw portion of the fastening member is formed,
The tool holder has a truncated cone-shaped opening formed at the front end to receive the truncated cone-shaped portion of the shank portion of the cutting head member, and a cylindrical beam formed inside the truncated cone-shaped opening to accommodate the cylindrical portion of the cutting head member. And a through hole formed along the axial direction with a diameter smaller than the diameter of the cylindrical bore portion, the front end of the through hole having a female screw portion for receiving the second male screw portion of the fastening member along the axial direction; ,
In the state where the cutting tool assembly is assembled, the conical portion of the shank portion of the cutting head member is in contact with the cone-shaped opening of the tool holder, and the cylindrical portion of the shank portion of the cutting head member is in contact with the cylindrical bore portion of the tool holder. Cutting tool assembly.
The thickness between the outer diameter of the first male screw portion of the fastening member screwed with the female screw portion formed on the shank portion of the cutting head member and the outer diameter of the cylindrical portion of the shank portion of the cutting head member is the outer diameter of the cylindrical portion of the shank portion. A cutting tool assembly greater than 0.05 times and less than 0.2 times the outer diameter of the cylindrical portion of the shank portion.
And a rod flank of the screw coupling portion for screwing the female screw portion formed in the shank portion of the cutting head member and the first male screw portion of the fastening member is formed at an angle of 30 to 50 degrees with a straight line perpendicular to the axial direction.
And a axial length of the intermediate portion of the cutting head member is greater than 0.1 times the outer diameter of the cutting portion of the cutting head member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20100100696A KR101164751B1 (en) | 2010-10-15 | 2010-10-15 | Cutting tool assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20100100696A KR101164751B1 (en) | 2010-10-15 | 2010-10-15 | Cutting tool assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20120039159A KR20120039159A (en) | 2012-04-25 |
KR101164751B1 true KR101164751B1 (en) | 2012-07-12 |
Family
ID=46139578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR20100100696A KR101164751B1 (en) | 2010-10-15 | 2010-10-15 | Cutting tool assembly |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR101164751B1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000288821A (en) | 1999-03-31 | 2000-10-17 | Mitsubishi Materials Corp | Cutting tool of cutter body replaceable type |
-
2010
- 2010-10-15 KR KR20100100696A patent/KR101164751B1/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000288821A (en) | 1999-03-31 | 2000-10-17 | Mitsubishi Materials Corp | Cutting tool of cutter body replaceable type |
Also Published As
Publication number | Publication date |
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KR20120039159A (en) | 2012-04-25 |
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