Search

KR-20260063810-A - Cutting Head Detachably Coupled And Holder for the Same

KR20260063810AKR 20260063810 AKR20260063810 AKR 20260063810AKR-20260063810-A

Abstract

The present invention relates to a removably fastened cutting head (100) comprising a head cutting portion (101) including a cutting edge and a head fastening portion (102) formed to extend axially below the head cutting portion (101) and fastened to a holder (200), wherein the head fastening portion (102) comprises: a head male screw (110) which is screw-coupled with a holder female screw (210) formed in the holder (200) when fastened to the holder (200); and a head axial support surface (120) formed perpendicular to the axial direction of the cutting head (100) on the lower bottom surface of the head cutting portion (101) and which supports a load in the axial direction when fastened to the holder (200). The present invention provides a cutting head (100) that is removably fastened, comprising: a head radial support surface (130) that supports a load in the radial direction when fastened to the holder (200) as an outer surface of the head fastening portion (102); wherein the head radial support surface (130) comprises a head radial first support surface (131) formed on the head male screw (110) and a head radial second support surface (132) formed below the head male screw (110).

Inventors

  • 임효준
  • 손홍승
  • 김영흠

Assignees

  • 한국야금 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (20)

  1. A detachably fastened cutting head (100) comprising a head cutting portion (101) including a cutting edge, and a head fastening portion (102) formed to extend axially below the head cutting portion (101) and fastened to a holder (200), wherein The head fastening part (102) above is, A head male screw (110) that is screw-coupled with a holder female screw (210) formed in the holder (200) when fastened to the holder (200); A head shaft support surface (120) formed perpendicularly to the axial direction of the cutting head (100) on the lower bottom surface of the head cutting part (101) and supporting a load in the axial direction when fastened to the holder (200); and It includes a head radial support surface (130) which supports a load in the radial direction when fastened to the holder (200) as an outer surface of the head fastening part (102); The above head radial support surface (130) comprises a head radial first support surface (131) formed on the head male screw (110) and a head radial second support surface (132) formed below the head male screw (110), wherein the cutting head (100) is removably fastened.
  2. In paragraph 1, A head fastening groove (140) is formed in the circumferential direction on the radial support surface (130), and a ring-shaped elastic body (140a) is fitted into the head fastening groove (140). The elastic body (140a) fitted into the head fastening groove (140) protrudes radially from the radial support surface (130), and A cutting head (100) that is detachably fastened, in which the protruding part of the elastic body (140a) is elastically deformed and fastened by an interference fit when the head fastening part (102) is fastened to the holder (200).
  3. In paragraph 2, The head fastening groove (140) includes a head fastening first groove (141) formed circumferentially on the head radial first support surface (131), and The above elastic body (140a) comprises a ring-shaped first elastic body (141a) that is fitted into the first groove (141) of the head fastening part, and is a cutting head (100) that is removably fastened.
  4. In paragraph 2, The head fastening groove (140) includes a second head fastening groove (142) formed circumferentially on the second head radial support surface (132), and The above elastic body (140a) comprises a ring-shaped second elastic body (142a) that is fitted into the second groove (142) of the head fastening part, and is a cutting head (100) that is releasedly fastened.
  5. In paragraph 2, The head fastening groove (140) includes a first head fastening groove (141) formed circumferentially on the first head radial support surface (131) and a second head fastening groove (142) formed circumferentially on the second head radial support surface (132). The above elastic body (140a) comprises a ring-shaped first elastic body (141a) fitted into the first groove (141) of the head fastening part and a ring-shaped second elastic body (142a) fitted into the second groove (142) of the head fastening part, wherein the cutting head (100) is removably fastened.
  6. In paragraph 1, A cutting head (100) that is removably fastened, wherein the diameter (d2) of the second radial support surface (132) of the head is formed to be larger than the root diameter (di) of the head male screw (110).
  7. In paragraph 1, A cutting head (100) that is removably fastened, wherein the axial length of the first radial support surface (131) of the head is formed to be 100 to 130% of the axial length of the second radial support surface (132) of the head.
  8. In Paragraph 7, A cutting head (100) that is removably fastened, wherein the axial length of the first radial support surface (131) of the head is formed to be the same as the axial length of the second radial support surface (132) of the head.
  9. In paragraph 1, The first support surface (131) in the radial direction of the head is formed in a tapered shape that narrows downward, and The above head radial first support surface (131) is a detachably fastened cutting head (100) having an axial length corresponding to 45-50% of the maximum diameter.
  10. In Paragraph 9, The above head radial first support surface (131) is a removably fastened cutting head (100) having an axial length of 50% of the maximum diameter.
  11. In paragraph 1, The first support surface (131) in the radial direction of the head is formed in a tapered shape that narrows downward, and A cutting head (100) that is removably fastened, wherein the maximum diameter of the first radial support surface (131) of the head is 60 to 80% of the maximum outer diameter of the head cutting portion (101).
  12. In Paragraph 11, A removably fastened cutting head (100), wherein the maximum diameter of the first radial support surface (131) of the head is 73 to 76% of the maximum outer diameter of the head cutting portion (101).
  13. In paragraph 1, The above head radial second support surface (132) is formed in a cylindrical shape and is a cutting head (100) that is releasedly fastened.
  14. In Paragraph 13, A cutting head (100) that is releasedly fastened, wherein the diameter (d2) of the second radial support surface (132) of the head is formed to be smaller than the diameter (d1) of the first radial support surface (131) of the head.
  15. In Paragraph 14, The first support surface (131) in the radial direction of the head is formed in a tapered shape that narrows downward, and A cutting head (100) that is releasedly fastened, wherein the outer diameter (do) of the head male screw (110) is formed to be smaller than the minimum diameter of the first radial support surface (131) of the head.
  16. A holder (200) for a cutting head that is removably fastened, comprising a holder fastening portion (202) which is a space into which a cutting head (100) is inserted and fastened, and a shank (250) formed to extend axially below the holder fastening portion (202). The above holder fastening part (202) is, A holder female screw (210) that is screw-coupled with a head male screw (110) formed on the cutting head (100) when the cutting head (100) is inserted and fastened; A holder shaft support surface (220) formed perpendicular to the axial direction of the holder (200) on the upper upper surface of the holder fastening part (202) and supporting a load in the axial direction when fastened with the cutting head (100); and It includes a holder radial support surface (230) that supports a load in the radial direction when fastened with the cutting head (100) as an inner circumferential surface of the holder fastening part (202). The holder radial support surface (230) comprises a holder radial first support surface (231) formed on the holder female screw (210) and a holder radial second support surface (232) formed below the holder female screw (210), forming a holder that is removably fastened, for a cutting head holder (200).
  17. In Paragraph 16, A holder (200) for a cutting head that is removably fastened, wherein the diameter (D2) of the second radial support surface (232) of the holder is formed to be the same as the inner diameter (Di) of the female screw (210) of the holder.
  18. In Paragraph 17, The holder radial second support surface (232) is formed in a cylindrical shape and is a holder (200) for a cutting head that is removably fastened.
  19. In Paragraph 18, The first radial support surface (231) of the holder is formed as a tapered shape that narrows downward, and is a holder (200) for a cutting head that is releasedly fastened.
  20. In Paragraph 19, A head radial support surface (130) is formed on the outer surface of the head fastening portion (102) of the cutting head (100) that is fastened to the holder (200), and supports a load in the radial direction when fastened to the holder (200). A holder (200) for a cutting head that is removably fastened, wherein the axial length of the radial support surface (230) of the holder is formed to be shorter than the axial length of the radial support surface (130) of the head.

Description

Cutting Head Detachably Coupled and Holder for the Same The present invention relates to a cutting head that is removably connected for a cutting tool and a holder for the cutting head. The cutting tool includes a cutting head having a cutting edge formed thereon and a holder in which the cutting head is received and secured. For such cutting tools, the head and holder must have excellent axial alignment when connected. Referring to FIG. 10, prior art patent publication No. 10-1965173 discloses a screw-fastened tool comprising a tool head (3) and a tool shank (4), wherein the tool shank has an external screw (5) and a support area located between the tool head (3) and the external screw (5), and the support area is formed by two conical bearing surfaces (6, 8) having different conical angles. The cutting tool of the above prior art document establishes a support area by conical bearing surfaces (6, 8) formed adjacent to each other, and is supported axially by the bearing surface (6) and radially by the bearing surface (8). However, there was a problem in that the support area was limited by only the adjacent bearing surfaces (6, 8), so axial alignment could not be properly achieved when the tool head (3) and the tool shank (4) were connected. FIG. 1 is a figure showing a cutting head and a head in a connected state and a head in a disconnected state according to an embodiment of the present invention. FIG. 2 is a front view showing the structure of a cutting head according to one embodiment of the present invention, FIGS. 3 to 5 are drawings showing embodiments in which a ring-shaped elastic body is fitted onto the radial support surface of the head of FIG. 2. FIG. 6 is a longitudinal cross-sectional view showing the structure of a holder for a cutting head according to one embodiment of the present invention, FIG. 7 is a longitudinal cross-sectional view of the head fastening portion of a cutting head according to one embodiment of the present invention, FIG. 8 is a longitudinal cross-sectional view of a holder fastening portion of a holder for a cutting head according to one embodiment of the present invention, FIG. 9 is a cross-sectional view showing the state in which the head fastening part of FIG. 7 and the holder fastening part of FIG. 8 are combined. FIG. 10 is a longitudinal section showing the structure of a conventional cutting tool. Hereinafter, embodiments of a removably coupled cutting head and a holder for a cutting head according to the present invention will be described in detail with reference to FIGS. 1 to 9. FIG. 1 shows a cutting head and a head in a connected state and a disconnected state according to one embodiment of the present invention. Referring to FIG. 1, a detachably coupled cutting head (100) according to one embodiment of the present invention includes a head cutting portion (101) including a cutting edge and a head fastening portion (102) formed to extend axially below the head cutting portion (101) and fastened to a holder (200). Additionally, a holder (200) for a cutting head that is removably fastened according to one embodiment of the present invention includes a holder fastening portion (202) which is a space into which a cutting head (100) is inserted and fastened, and a shank (250) formed to extend axially below the holder fastening portion (202). The cutting head (100) and the holder (200) are configured to be connected or disconnected by screw connection. FIG. 2 shows the structure of a cutting head (100) according to one embodiment of the present invention, and FIG. 3 to 5 show embodiments in which a ring-shaped elastic body is fitted onto the radial support surface of the head of FIG. 2. Referring to FIG. 2, a cutting head (100) according to one embodiment of the present invention includes a cutting portion (101) at the top and a head fastening portion (102) formed to extend axially at the bottom. The head fastening portion (102) includes a head male screw (110), a head shaft support surface (120), and a head radial support surface (130). The head male screw (110) is formed to be screw-coupled with the holder female screw (210) formed in the holder (200) when fastened to the holder (200). The head shaft support surface (120) is formed on the lower bottom surface of the head cutting part (101) as a surface perpendicular to the axial direction of the cutting head (100), and supports a load in the axial direction when the cutting head (100) is fastened to the holder (200). The head radial support surface (130) is formed on the outer surface of the head fastening part (102) and supports a load in the radial direction when the cutting head (100) is fastened to the holder (200). As illustrated in FIGS. 2 to 5, the head radial support surface (130) includes a head radial first support surface (131) formed on the head male screw (110) and a head radial second support surface (132) formed below the head male screw (110). By forming a first head radial support surface (13