JP2005212043A - Throw-away drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throw-away drill which is excellent in workability at the time of exchanging throw-away tips and cost performance, and free from degradation in strength even if it is of a small-diameter type. <P>SOLUTION: The throw-away drill 1 is set up by firmly clamping the almost plate-like throw-away tip 4 in a front-end recess 3 of a holder 2. The holder 2 includes first and second clamping wall surfaces 6a, 6b formed in inner walls of the front-end recess 3 in a manner opposed to each other, an engaging wall surface 8 adjacent to the first clamping wall surface 6a, and a screw hole 13 adjacent to the second clamping wall surface 6b and formed in an area from a holder front-end face 14 toward the rear end of the holder 2. The throw-away tip 4 includes a first clamped wall surface 7a which abuts on the first clamping wall surface 6a of the holder 2, and a second clamped wall surface 7b and an engaged wall surface 9 which abut on the second clamping wall surface 6b and the engaging wall surface 8 of the holder 2. Then the throw-away tip 4 is firmly pressed into the front-end recess 3 formed in the holder 2 with a screw member 5 screwable into the screw hole 13 formed in the holder 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a throw-away drill in which a throw-away tip having a rotation axis common to a holder tool main body is detachably mounted.

  Conventionally, as a throw-away drill in which a throw-away tip having a rotation axis common to the holder tool main body is detachably mounted, a configuration is known in which the throw-away tip placed on the tip of the holder is fastened and fixed with a screw (for example, Patent Document 1).

In addition, a configuration is known in which a plate-shaped throw-away tip is sandwiched between the tip portions of the holder and the side surfaces of the holder are fastened and fixed with screws as disclosed in Patent Document 2.
JP 2003-291010 A Japanese translation of PCT publication No. 2002-522233

  However, in the configuration as disclosed in Patent Document 1, the screw must be completely removed from the holder every time the throw-away tip is replaced, which is particularly wrong in the operation with the holder attached to the machine tool. There was a problem that it was easy to lose a screw. Also, a through-hole for threading the throw-away tip must be provided. Especially when this configuration is used with a small-diameter throw-away drill, the thickness of the throw-away tip is reduced, resulting in insufficient strength and damage. There was also a problem that it was easy to do.

  On the other hand, in the configuration as disclosed in Patent Document 2, although it is not always necessary to completely remove the screw from the holder in order to replace the throw-away tip, a through-hole must be provided in the throw-away tip as described above. It was difficult to prevent the strength of the throw-away tip from decreasing.

  The present invention has been made to solve such problems of the prior art, and in a throw-away drill in which a throw-away tip having a rotation axis common to a holder tool body is detachably mounted, the throw-away tip is replaced. An object of the present invention is to provide a throw-away drill that has excellent operability at the time, and that does not decrease in strength even if it is a small diameter type.

  In order to solve the above-mentioned problem, the throw-away drill of the present invention is a throw formed by detachably fixing a substantially plate-shaped throw-away tip to a recessed portion at the tip of a holder having a rotation shaft common to the throw-away tip. In the away drill, the holder includes first and second sandwiching wall surfaces facing the inner wall of the tip recess, a locking wall surface adjacent to the first sandwiching wall surface, and a holder tip adjacent to the second sandwiching wall surface. A screw hole formed from the surface toward the rear end side of the holder, and the throw-away tip is provided at the tip and provided at the main side surface with two cutting blades positioned symmetrically with respect to the rotation axis A first sandwiched wall surface, a second sandwiched wall surface, and a latched wall surface that are in contact with the first sandwich wall surface, the second sandwich wall surface, and the latch wall surface of the holder, respectively, and the holder The screw member is screwed into the screw hole, the cutting insert is characterized in that it is pressed and fixed in the tip recess of the holder.

  According to this configuration, the throw-away tip can be detached by loosening the screw member and releasing the contact portion between the screw member and the throw-away tip, and the throw-away tip can be replaced without completely removing the screw member from the holder. . Further, since it is not necessary to provide a through-hole in the throw-away tip, stable processing can be performed without reducing the strength even when used with a small-diameter throw-away drill. Further, the screw member has a side head having a diameter larger than the diameter of the thread groove portion, and the throw-away tip is pressed and fixed to the holder by contacting the side head with the throw-away tip. Thus, the throw-away tip is simultaneously pressed toward the radial direction of the holder and toward the rear end side in the axial direction, which is desirable in that it is more stably fixed.

  Further, the screw member is inclined so as to approach the tip side toward the rear end side of the holder, and at least a part of the tip surface of the screw member abuts on the throw-away tip, and When the away tip is pressed and fixed, the throw-away tip is simultaneously pressed toward the radial direction and the axial rear end side of the holder, so that it is fixed in a more stable state and received from the throw-away tip. Since the reaction force is applied in the axial direction of the screw member, it is desirable in that the throw-away tip can be pressed more firmly while maintaining the strength of the screw member.

  Furthermore, the first clamping wall surface and the second clamping wall surface of the holder are formed so as to incline so that the surface interval gradually decreases toward the tip of the holder, so that the throw away with the holder attached to the machine tool. When the tip is replaced, even if the screw member is loosened, the throw-away tip does not fall off at the clamping wall surface and does not drop, so that a throw-away drill with excellent work operability can be obtained.

  According to the throw-away drill of the present invention, in the throw-away drill in which the substantially plate-shaped throw-away tip is detachably fixed to the tip recess of the holder having a rotation shaft common to the throw-away tip, The holder includes two first and second sandwiching wall surfaces facing the inner wall of the tip recess, a locking wall surface adjacent to the first sandwiching wall surface, a second sandwiching wall surface adjacent to the holder tip surface and the rear of the holder. A screw hole formed toward the end side, and the throw-away tip is provided at the tip of the two cutting blades positioned symmetrically with respect to the rotation axis, and provided on the main side surface of the holder. A first sandwiched wall surface, a second sandwiched wall surface, a second sandwiched wall surface, and a latched wall surface that are in contact with the first sandwich wall surface, the second sandwich wall surface, and the latch wall surface, respectively, and screwed into the screw holes of the holder The throw-away tip can be attached and detached by loosening the screw member by releasing the contact portion between the screw member and the throw-away tip by pressing and fixing the throw-away tip into the tip recess of the holder by the screw member. The throw-away tip can be replaced without completely removing the screw member from the holder, and it is not necessary to provide a through-hole in the throw-away tip, so the strength is reduced even when used with a small-diameter throw-away drill. And stable processing.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 to FIG. 7 show an embodiment of the present invention. FIG. 1 is a perspective view of a tip portion of the throw-away drill according to the first embodiment of the present invention, and FIG. 2 is an exploded view of the throw-away drill of FIG. 1 is a perspective view of the holder of FIG. 1, (b) a side view as seen from the direction A, FIG. 4 is a perspective view of the throwaway tip of FIG. 1, (b) B FIG. 5 is a front perspective view of a throw-away drill according to a second embodiment of the present invention, FIG. 6 is an exploded perspective view of the throw-away drill of FIG. 5, and FIG. 7 is a C direction of FIG. It is the side view seen from (partly perspective view).

  In FIG. 1, a throw-away drill (hereinafter abbreviated as “drill”) 1 according to a first embodiment of the present invention has a throw-away tip (hereinafter abbreviated as “chip”) in a distal-end recess 3 formed on the distal end side of a holder 2. ) 4 is inserted, and the chip 4 is fixed to the holder 2 with a screw member 5. First, as shown in FIG. 3, the holder 2 is adjacent to the first and second sandwiching wall surfaces 6a and 6b and the first and second sandwiching wall surfaces 6a and 6b facing the inner wall of the tip recess 3 respectively. The throwaway tip 4 includes a locking wall surface 8 and a screw hole 13 formed adjacent to the second clamping wall surface 6b and formed from the holder front end surface 14 toward the rear end side of the holder 2, and the throwaway tip 4 is as shown in FIG. Two cutting blades 10 provided at the tip and positioned symmetrically with respect to the rotating shaft 11, and a first clamping wall surface 6a, a second clamping wall surface 6b and a locking wall surface of the holder 2 provided on the main side surface 8, a first sandwiched wall surface 7a, a second sandwiched wall surface 7b, and a locked wall surface 9 are provided.

  Here, as shown in FIG. 3, the tip recess 3 is configured such that the clamping wall surface 6 is inclined so that the surface interval gradually decreases toward the tip of the holder 2. As shown in FIG. 4, the contacting tip 4 is also configured to be inclined so that the inter-surface distance gradually decreases as the sandwiched wall surface 7 moves toward the tip end side of the tip 4, so that the holder 2 is attached to the machine tool. When exchanging the tip 4 in a state where the tip 4 is replaced, the tip 4 is clamped by the clamping wall surface 6 even if the screw member 5 is removed, and the tip 4 does not fall off the holder 2 and has excellent work operability. 1 can be used.

  Incidentally, when mounting the chip 4, as shown in FIG. 2, first, the chip 4 is first inserted into the tip recess 3 from the side of the holder 2, and the locked wall surface 9 on the chip 4 side is on the holder side. Push it in until it contacts the locking wall 8. Here, the screw member 5 is screwed into the screw hole 13 provided in parallel with the rotating shaft 11 of the holder 2 from the tip side of the holder 2 on the holder tip surface 14 adjacent to the second clamping wall surface 6b of the holder 2. The tip 4 is pressed and fixed to the tip recess 3 of the holder 2 by engaging the side head 5a of the screw member 5 with the recess 12 (see FIG. 4) on the tip 4 side.

  Further, since the tip 4 is inserted into the tip recess 3 from the side of the holder 2, the tip 4 is detached by loosening the screw member 5 and releasing the engagement between the screw member 5 and the recess 12 of the tip 4. Since the chip 4 can be replaced without completely removing the screw member 5 from the holder 2, the screw member 5 removed every time the chip is replaced is not accidentally lost, and the work operability is further improved. be able to.

  In addition, the tip 4 is configured so that a part of the side head portion 5a of the screw member 5 and the recess 12 of the tip 4 are engaged and the tip 4 is pressed and fixed to the tip recess 3 so that the tip 4 is in the radial direction of the holder 2. That is, since it is simultaneously pressed toward the holding wall surface 6b and the locking wall surface 8 and toward the rear end side in the direction of the rotation axis 11 of the holder 2, the displacement of the tip 4 is suppressed and the chip 4 is fixed in a more stable state. Can do.

  Further, according to the second embodiment of the present invention shown in FIGS. 5 to 7, the screw member 5 is screwed in a direction in which it is inclined so as to approach the rotating shaft 11 side toward the rear end side of the holder 2. Since at least a part of the tip end surface of the screw member 5 is engaged with the recess of the chip 4 and the chip 4 is pressed and fixed, the chip 4 is a holder as in the first embodiment described above. 2, that is, the direction of the clamping wall surface 6 b and the locking wall surface 8 and the rear end side of the holder 2 in the direction of the rotation axis 11, so that the positional deviation of the chip 4 is suppressed and more stable. In addition to being fixed in a state, the reaction force received from the tip 4 is applied in the axial direction of the screw member 5, so that there is an advantage that the tip 4 can be pressed more firmly while maintaining the strength of the screw member 5.

  In both the first embodiment and the second embodiment, there is no need to provide a through hole for screwing the tip 4, so that the tip strength is not lowered even when applied to a small-diameter drill. More stable drilling can be performed over a long period of time.

It is a front-end | tip part perspective view of the throw away drill by 1st embodiment of this invention. It is a disassembled perspective view of the throw away drill of FIG. It is the (a) tip view of the holder of FIG. 1, (b) The side view seen from A direction. FIG. 2A is a front view of the throw-away tip of FIG. 1 and FIG. It is a front-end | tip part perspective view of the throw away drill by 2nd embodiment of this invention. FIG. 6 is an exploded perspective view of the throw-away drill in FIG. 5. FIG. 6 is a side view (partially perspective view) seen from the direction C of FIG. 5.

Explanation of symbols

1 Throw away drill (drill)
2 Holder 3 (Holder side) Tip recess 4 Throw away tip (chip)
DESCRIPTION OF SYMBOLS 5 Screw member 5a Screw member side head 5b Screw member front end surface 6 Clamping wall surface 6a First clamping wall surface 6b Second clamping wall surface 7 Clamping wall surface 7a First clamping wall surface 7b Second clamping surface 8 Wall surface 9 (chip side) Locked wall surface 10 Cutting edge 11 Rotating shaft 12 (Chip side) Recess 13 Screw hole 14 Holder tip surface

Claims (4)

In the throw-away drill, in which the substantially plate-shaped throw-away tip is detachably fixed to the tip recess of the holder having a rotation axis common to the throw-away tip,
The holder includes first and second sandwiching wall surfaces facing each other to the inner wall of the tip recess, a locking wall surface adjacent to the first sandwiching wall surface, and a holder tip surface adjacent to the second sandwiching wall surface from the holder tip surface. A screw hole formed toward the rear end side,
The throw-away tip includes two cutting blades provided at the tip and positioned symmetrically with respect to the rotation axis, and a first clamping wall surface, a second clamping wall surface, and a locking wall surface of the holder provided on a main side surface. A first sandwiched wall surface, a second sandwiched wall surface, and a locked wall surface, which are in contact with each other;
The throw-away drill is characterized in that the throw-away tip is pressed and fixed in the recess of the tip of the holder by a screw member screwed into the screw hole of the holder. The screw member has a side head having a diameter larger than the diameter of the thread groove portion, and the throw-away tip is pressed and fixed to the holder by contacting the side head with the throw-away tip. The throw-away drill according to claim 1. The screw member is inclined so as to approach the tip side as it goes to the rear end side of the holder, and at least a part of the tip surface of the screw member abuts on the throw-away tip, and the throw-away tip The throw-away drill according to claim 1, wherein is fixed by pressing. The first holding wall surface and the second holding wall surface of the holder are formed so as to be inclined so that the surface interval gradually decreases toward the tip end side of the holder. Throw away drill.

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