JP2011020237A - Cutting tip fixing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tip fixing structure for reliably and easily attaching a tip to a holder in a correct posture at all times. <P>SOLUTION: The cutting tip fixing structure includes the holder 2 for supporting the cutting tip 50, an attachment bolt 12 for fixing the tip 50 to the holder, and a seat member 23 inserted between a tip seat 7 of the holder 2 and the tip 50. The cutting tip fixing structure also includes a seat separating portion 30 for separating the seat member 23 from the tip seat 7 based on a loosening operation of the attachment bolt 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes a holder for supporting a cutting tip with respect to a rotating workpiece, a mounting bolt for fixing the tip to the holder, and a sheet member interposed between the tip seat of the holder and the tip. The present invention relates to a cutting tip fixing structure provided.

  As prior art document information related to this type of cutting tip fixing structure, there is Patent Document 1 shown below. In the cutting chip fixing structure described in Patent Document 1, since the sheet member is interposed between the chip seat of the holder and the chip, the chip seat may be damaged when the chip is chipped or the hardness. The tip seat is prevented from being deformed by the tip when cutting a high material. In addition, the mounting surface of the mounting bolt provided on the holder is not a simple taper surface, but is a combination of a taper surface and a counterbore hole that has been cut vertically to leave a part of the taper surface. Two ridge lines project from the boundary between the face and the counterbore hole. Therefore, as the mounting bolt is tightened, the mounting bolt is supported at least at two points by simultaneously contacting the two ridge lines formed on the holder, so the receiving surface of the mounting bolt is a simple tapered surface. Compared with what was comprised by this, it is supposed that a chip | tip can be pressed in the more stable form toward the chip | tip seat wall surface of a holder. At the same time, the sheet member is simultaneously pressed and fixed to the bottom surface of the chip seat of the holder via the chip.

Japanese Utility Model Publication No.57-28803 (page 7, line 5-20, FIG. 5)

  However, in the conventional cutting tip fixing structure described in Patent Document 1, when replacing the tip or changing the orientation of the tip, etc., when the mounting bolt is loosened from the state where the tip is fixed to the holder, Only the chip was pulled away from the chip seat of the holder, and the sheet member remained on the chip seat bottom surface of the holder. For this reason, foreign matter such as cutting waste remains in the gap between the sheet member and the holder, and it may be difficult to reliably attach the chip in the correct posture when the chip is next attached.

  Accordingly, an object of the present invention is to provide a cutting tip fixing structure that is always easy to securely attach a tip to a holder in a correct posture in view of the problems given by the cutting tip fixing structure according to the prior art exemplified above. is there.

The first characteristic configuration of the cutting tip fixing structure according to the present invention is:
A holder for supporting a cutting tip;
A mounting bolt for fixing the chip to the holder;
A sheet member interposed between the chip seat of the holder and the chip,
A sheet separating portion for pulling the sheet member away from the chip seat based on the loosening operation of the mounting bolt is provided.

  In the cutting tip fixing structure according to the first feature of the present invention, when the mounting bolt is loosened, the tip is not only released from the state of being pressed against the wall surface of the tip seat, but the seat member is automatically pulled away from the tip seat. Since the chip seat is exposed, the chip seat can be reliably and easily cleaned with compressed air or the like. As a result, the problem that foreign matter such as cutting waste remains in the gap between the sheet member and the holder is solved, so that it is always easy to securely attach the chip to the holder in the correct posture.

  Another feature of the present invention is that the sheet separating portion has a flange shape having an outer diameter larger than the inner diameter of the sheet member and the outer diameter of the male screw portion of the mounting bolt.

  Although it is possible to use the base end side itself of the male screw portion as the sheet separating portion, in that case, when setting the outer diameter of the male screw portion, the sheet member can be smoothly moved and operated by the sheet separating portion. Thus, it is necessary to increase the diameter of the male screw portion, and as a result, it is difficult to reduce the size of the holder. However, if the sheet separating portion has a flange shape larger in diameter than the male screw portion as in this configuration, the outer diameter of the male screw portion is, for example, the same as the conventional one, but only the outer diameter of the sheet separating portion is It can be set freely so as to be convenient for the moving operation. As a result, a sheet separating section that smoothly pulls the sheet member away from the chip seat based on the loosening operation of the mounting bolt is obtained.

  Another feature of the present invention is that the sheet separating portion includes a flange-like member separate from the attachment bolt and a support surface provided on the attachment bolt to support the flange-like member. is there.

  A configuration in which the sheet separating portion is integrally formed as a part of the mounting bolt is also possible, but in that case, screw processing on the base end side of the male screw portion becomes difficult. If a flange-shaped sheet separating portion and a meat stealing portion that is recessed in the radial direction are provided on the base end side of the male screw portion, screw processing is facilitated. In this case, the male screw is provided by an amount corresponding to the meat stealing portion. The effective length of will decrease. However, with this configuration, even if no meat stealing portion is provided, it is easy to thread the male screw portion before attaching the flange-shaped member, and at the base end side of the male screw portion ( As a result, the effective length of the male screw is increased and the ability to fix the chip is enhanced.

It is a disassembled perspective view which shows the fixing structure of the cutting tip by this invention. It is a perspective view which shows the fixing structure of the cutting tip by this invention. It is a fracture | rupture side view which shows the attachment process of the chip | tip for cutting. It is a fracture | rupture side view which shows the removal process of the chip | tip for cutting. It is a fracture | rupture side view which shows another embodiment of this invention.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.
(Schematic structure of fixed structure)
As shown in FIG. 1, the cutting tip fixing structure according to the present invention includes a holder 2 for supporting a cutting tip 50, a mounting bolt 12 for fixing the tip 50 to the holder 2, and a holder 2. And a sheet member 23 interposed between the chip 50 and the chip 50. FIG. 2 shows a state in which the chip 50 is correctly fixed to the holder 2.

The holder 2 includes a flange portion 4 for fixing to a machine tool and a holder body 6, and the holder body 6 is provided with a support recess 6 a for receiving a chip 50. The support recess 6a includes one chip seat bottom surface 7 and two chip seat wall surfaces 8 orthogonal to each other. In particular, the sheet member 23 serves to prevent the chip seat bottom surface 7 from being dented by the pressing force from the chip 50 or from being damaged when the chip 50 is chipped.
A screw hole 10 into which the mounting bolt 12 can be screwed is formed through the chip seat bottom surface 7 along the axis X1. Further, a meat stealing portion 9 for receiving the tip of the tip 50 on the side not in use is extended at an intersection between the two chip seat wall surfaces 8.
Here, for convenience, a plane extending across the axis X1 at the upper end of the chip seat wall surface 8 will be referred to as the upper surface 6b of the holder 2, and the opposite side along the axis X1 will be referred to as the lower surface 6c of the holder 2. .

  The mounting bolt 12 includes a male screw portion 14 having the largest diameter, a first neck portion 15 extending from the upper end of the male screw portion 14, a second neck portion 16 extending from the upper end of the first neck portion 15, and The head portion 18 is provided at the upper end of the second neck portion 16. The first neck portion 15 and the second neck portion 16 are not provided with screw portions. All the parts extend linearly along a common axis X2. In addition, the outer peripheral portions of all portions except for the head portion 18 also extend in a straight line generally parallel to the axis X2. The first neck portion 15 has a smaller diameter than the male screw portion 14, and the second neck portion 16 has a smaller diameter than the first neck portion 15. The head portion 18 has an outer peripheral surface that is curved along the axis X <b> 2, but the maximum diameter is sufficiently larger than that of the second neck portion 16. An odd-shaped slot 19 into which a tool T such as a hexagon wrench can be mounted is formed at the lower end of the male screw portion 14.

The tip 50 has a rectangular parallelepiped shape in cross section, and its four corners constitute a cutting surface 52, and a through hole 54 for receiving the mounting bolt 12 is provided in the center.
The sheet member 23 also has a rectangular parallelepiped shape in section, but is generally thinner than the chip 50 and has a through hole 24 for receiving the mounting bolt 12 in the center. The through hole 24 of the sheet member 23 is formed with a larger diameter than the through hole 54 of the chip 50.

The greatest feature of the cutting tip fixing structure according to the present invention is that an annular groove 20 (an example of a support surface) is formed between the male thread portion 14 and the first neck portion 15 of the mounting bolt 12. The ring 30 (an example of a sheet separating portion and a flange-shaped member) is locked. The E-ring 30 has an outer diameter sufficiently larger than the outer diameters of the through hole 24 of the seat member 23 and the male screw portion 14 of the mounting bolt 12. Since the male threaded portion 14 of the mounting bolt 12 has a diameter larger than that of the first neck 15 and is formed before the E-ring 30 is mounted, it is easy to screw the entire thread including the upper end of the male threaded portion 14. It has been formed.
A housing recess 11 for receiving the E-ring 30 is formed on the chip seat bottom surface 7 of the holder 2. The storage recess 11 has an inner diameter that exceeds the outer diameter of the E-ring 30 and a depth that slightly exceeds the thickness of the E-ring 30.

(Chip attachment procedure)
The operation of attaching the chip 50 to the holder 2 can proceed as follows.
<1> First, the mounting bolt 12 to which the E-ring 30 is locked is screwed into the upper end of the screw hole 10 of the holder 2, and then the hexagon wrench T mounted in the groove hole 19 at the lower end of the mounting bolt 12 or the like. Then, the mounting bolt 12 is screwed to a position where the distance from the lower end of the head portion 18 of the mounting bolt 12 to the upper surface 6b of the holder body 6 does not fall below the thickness of the chip 50.

<2> Next, as illustrated in FIG. 3A, the seat member 23 is externally fitted to the mounting bolt 12 in such a posture that two sides are parallel to the chip seat wall surface 8 of the holder 2. 50 is fitted on the mounting bolt 12 in the same posture as the seat member 23. The sheet member 23 is externally fitted to the first neck portion 15, and the chip 50 is externally fitted to the second neck portion 16.

<3> When the mounting bolt 12 is screwed into the screw hole 10 of the holder 2 using the same hexagon wrench T or the like, and the head portion 18 of the mounting bolt 12 is brought close to the upper surface 6b of the holder body 6, FIG. As illustrated in (b), the sheet member 23 and the chip 50 are adjacent to the two chip seat wall surfaces 8.

<4> In a state where the chip 50 is adjacent to the chip seat wall surface 8, the axial center X 3 of the chip 50 is based on the positional features of the two chip seat wall surfaces 8. The minimum width L1 from the through hole 54 of the tip 50 to the outer peripheral surface 53 is the distance between the maximum diameter portion of the head portion 18 of the mounting bolt 12 and the tip seat wall surface 8 because it is at a position displaced from X1 by a certain amount. It exceeds L2. Therefore, when the mounting bolt 12 is screwed in the subsequent process, first, a part of the head portion 18 of the mounting bolt 12 always comes into contact with the upper end surface of the chip 50.

<5> Therefore, when the mounting bolt 12 is further screwed, the tip 50 eventually becomes between the head portion 18 of the mounting bolt 12 and the two tip seat wall surfaces 8 as illustrated in FIG. In a state where the sheet member 23 is restrained and pressed against the chip seat bottom surface 7, it is fixed to the support recess 6 a of the holder 2. A torque wrench may be used as the hexagon wrench T in order to tighten the mounting bolt 12 with a certain range of force. When the work piece that is rotating at high speed is pressed against the chip 50 in a state where the fixing of the chip 50 is completed in this way, cutting by the cutting surface 52 of the chip 50 becomes possible.

(Tip removal procedure)
Operations for exchanging the chip 50 and changing the orientation of the chip 50 can proceed as follows.
<1> First, as illustrated in FIG. 4A, when the loosening operation of the mounting bolt 12 is started with a hexagon wrench T or the like, the tip 50 is connected to the head portion 18 of the mounting bolt 12 and the two tip seat wall surfaces 8. Freed from the restraint between.

<2> When the mounting bolt 12 is further loosened, first, the E-ring 30 (an example of the sheet separating portion) of the mounting bolt 12 contacts the lower surface of the sheet member 23 and is further illustrated in FIG. Thus, the E ring 30 forcibly pulls the sheet member 23 away from the chip seat bottom surface 7, and thereafter, the sheet member 23 and the chip 50 are integrally moved away from the support recess 6 a of the holder 2.

<3> The mounting bolt 12 is further loosened, and the position from the lower end of the head portion 18 of the mounting bolt 12 to the upper surface 6b of the holder body 6 exceeds the thickness of the chip 50 as illustrated in FIG. When the mounting bolt 12 is loosened to the vicinity, the chip 50 is released from the two chip seat wall surfaces 8, so that the chip 50 can be removed from the holder 2. In this state, the sheet member 23 can also be removed from the holder 2.
Thus, when the mounting bolt 12 is loosened, the chip 50 is not only released from being pressed against the wall surface of the chip seat, but also the seat member 23 is automatically pulled away from the chip seat bottom surface 7 to expose the chip seat bottom surface 7. Therefore, the same part can be reliably and easily cleaned with compressed air or the like. As a result, the problem that foreign matter such as cutting waste remains in the gap between the sheet member 23 and the holder 2 is solved.

[Another embodiment]
<1> It is also possible to prepare a simple disk-like member instead of the E-ring as the flange-like member and integrate them by welding or the like in a state of being externally fitted to the mounting bolt 12. Also in this case, even if no meat stealing portion is provided, the male threaded portion can be easily threaded before the flange-like member is attached, and the base end side (wrinkle) of the male threaded portion is included. The male screw can be cut over the entire length.

<2> As shown in FIG. 5, the flange-like portion 40 may be integrally formed with the mounting bolt 32. Since the annular meat stealing portion 36 is provided at the boundary between the flange-like portion 40 and the male screw portion 34 of the mounting bolt 32, the crossing portion of the male screw portion 34 and the flange-like portion 40 is received on the holder 2 side. Even without providing a recess, the lower surface of the flange-shaped portion 40 can be brought into close contact with the upper surface of the holder.

  The present invention includes a holder for supporting a cutting tip with respect to a rotating workpiece, a mounting bolt for fixing the tip to the holder, and a sheet member interposed between the tip seat of the holder and the tip. The cutting tip fixing structure provided can be used as an invention that makes the fixing structure easier to use.

2 Holder 6 Holder body 6a Support recess 6b Upper surface 6c of holder 2 Lower surface 7 of holder 2 Chip seat bottom surface 8 Chip seat wall surface 10 Screw hole 11 Housing recess 12 Mounting bolt 14 Male thread portion 15 First neck portion 16 Second neck portion 18 Head part 20 annular groove (support surface)
23 Sheet member 24 Through hole 30 E ring (sheet separation part, flange-shaped member)
50 Tip 52 Cutting surface 54 Through-hole X1 Axis center X2 Axis center T Hexagon wrench (tool)

Claims (3)

A holder for supporting a cutting tip;
Mounting bolts for fixing the chip to the holder;
A sheet member interposed between the chip seat of the holder and the chip,
A cutting tip fixing structure provided with a sheet separating portion for separating a sheet member from a tip seat based on a loosening operation of a mounting bolt.   The cutting tip fixing structure according to claim 1, wherein the sheet separating portion has a flange shape having an outer diameter larger than the inner diameter of the sheet member and the outer diameter of the male screw portion of the mounting bolt.   The cutting tip fixing structure according to claim 2, wherein the sheet separating portion includes a flange-like member separate from the attachment bolt and a support surface provided on the attachment bolt to support the flange-like member.

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