JP2007038387A - Throw-away tip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform boring of a lathe, by use of a cutting tool holder for turning. <P>SOLUTION: A throw-away tip mounted on a cutting tool holder is provided with a fitting part 2 removably fixed to a tip seat provided on the cutting tool holder by a clamping means and a shaft part 3 extended from the fitting part 2 toward the front of the fitting part to be integrated with the fitting part. At least the tip side of the shaft part 3 is constructed as a body of a boring turning tool such as a body of a drill 4 including a cutting blade 4a and a helical flute 4b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a throw-away tip for enabling drilling of a center hole or the like using a lathe without using a drill holder.

  A tool with a cutting tool attached to the tip of a holder (shank) is used for various processes such as outer diameter copying, inner diameter processing, inner and outer diameter grooving, and chamfering. There is a small lathe called a comb-blade lathe in which a plurality of tools are mounted in parallel on a tool post.

  The comb blade type lathe is disclosed in, for example, Patent Document 1 below. This comb-blade lathe can perform various types of processing on the same workpiece with different types of cutting tools, and can cope with complicated product shapes without changing the workpiece. In addition, various types of drilling with a drilling tool such as drilling with holes and finishing with a reamer can be performed.

  By the way, when drilling with a lathe is performed with the tool fixed and the workpiece rotated, it is necessary to hold a tool such as a drill with a holder set on the tool post. If a square shank holder or a round shank holder used for turning can be used as the holder used at that time, it is advantageous in terms of economy and productivity.

However, since drilling tools such as drills and reamers that are normally used have a round shank, they must be held by a dedicated drill holder that has a chuck for gripping the round shank and are used for turning. Cannot be held with a square or round shank holder. For this reason, the above-mentioned effect due to sharing of the holder cannot be obtained.
Japanese Patent No. 328683 (paragraph 0030 and FIG. 29)

  In the present invention, in order to improve economic efficiency and productivity by integrating the types of holders, it is possible to perform drilling with a lathe using a holder for a turning tool (referred to as a bite holder in this invention). The challenge is to make it.

  In order to solve the above-described problems, in the present invention, an attachment portion that is detachably fixed to a tip seat provided on a bite holder by a clamping means, and an attachment portion that extends from the attachment portion to the front of the attachment portion are integrated. The shaft portion was provided in the throw-away tip, and the tip end side of the shaft portion was configured as the body of a drilling tool for drilling.

  The drilling tool for drilling included in the throw-away tip of the present invention is a drill, a center hole drill, a chamfering miller, a reamer, etc., and does not include a boring tool for inner diameter processing. These tools are used by rotating the workpiece and non-rotating the tool by mounting the throw-away tip of the present invention on a holder for a tool set on a tool post of a lathe.

  The attachment portion may be either one that is fastened with a clamp screw and fixed to the chip seat, or one that is pressed with a presser foot and fixed to the chip seat.

  The throw-away tip of the present invention can be considered as a combination of a turning tip and a drilling tool for drilling such as a drill. The tip side is a turning tool for drilling, but the attachment part to the holder is an attachment part similar to the attachment part of the turning tip. For this reason, it can be used by being mounted on a tool holder.

  Since the drill holder for gripping the round shank includes a mechanism for changing the diameter of the gripping portion, the structure is complicated and expensive. However, the holder for the tool is simple and inexpensive. In addition, since the holder for the tool can be used, the types of holders can be integrated, and the number of holders to be prepared is reduced, which is advantageous in terms of economy.

  Furthermore, since the holding of the turning tip and the holding of the throw-away tip of the present invention can be performed using the same holder, it is possible to respond to the replacement of the tool accompanying the change of the processing content only by replacing the cutting tool. This makes it possible to save labor and time for attaching and detaching the holder, which is advantageous in terms of productivity.

  Embodiments of the throw-away tip of the present invention will be described below with reference to FIGS. 1 to 7 of the attached drawings. FIG. 1 shows a first embodiment. The throw-away tip 1 is formed by integrally forming a body of a drill 4 on a flat attachment portion 2.

  The attachment portion 2 has a substantially parallelogram shape in a side view, but the shape may be arbitrarily set. Any shape that can be stably attached to the tip seat provided in the bite holder is acceptable. A shaft section (round shank) 3 that extends forward is formed integrally at a position biased toward the upper surface side of the front portion of the mounting section 2, and the tip side of the shaft section 3 is configured as the body of the drill 4. ing.

  The body of the drill 4 is processed in the same manner as a general drill body, and includes two cutting edges 4a and 4a and two twisted grooves 4b and 4b.

  The tool formed on the shaft portion 3 may be a center hole drill for making a center hole in a workpiece, a chamfering mill for chamfering a hole edge, a reamer for finishing the inner surface of a hole, or the like. The throw-away tip 1A provided with the center hole drill 5 in the shaft portion 3 is shown in FIG. 2, the throw-away tip 1B provided with the chamfering milling cutter 6 in the shaft portion 3 is shown in FIG. 3, and the reamer 7 is provided in the shaft portion 3. FIG. 4 shows the throw-away chip 1C.

  FIG. 5 shows a state in which the throw-away tip 1 of FIG. 1 is attached to a bite holder (shank) 10. The tool holder 10 is shown in which a tip seat 11 is provided at an upper corner portion on one side of the head portion, and the throw-away tip 1 attached to the tip seat 11 is clamped by the clamping means 12. The chip seat 11 has a flat seat bottom 11a and two seat walls 11b and 11c that intersect the seat bottom 11a at an acute angle or a right angle, respectively, and three or more provided on the surface 2b of the attachment portion 2 The protrusion 8 is supported by a seat bottom 11a, the surface 2c of the mounting portion 2 is supported by the seat wall 11b corresponding to the surface 2c, and the inclined surface 2d of the mounting portion 2 is supported by the seat wall 11c corresponding to the surface 2d.

  The clamp means 12 is composed of a presser foot 12a and a tightening screw 12b (the illustrated screw is a so-called W screw, but a normal tightening screw may be used). The illustrated clamping means 12 clamps the attachment portion 2 with a presser foot 12a, and has a structure in which a taper surface is provided on the head of a clamp screw that is screwed into the bite holder 10 and the taper surface 2e of the attachment portion 2 is pressed with the taper surface. Other clamping means are also conceivable.

  6 and 7 show still another example of the throw-away tip of the present invention. The throw-away tips 1D and 1E in FIGS. 6 and 7 are obtained by deforming the mounting portion 2, and the drilling tool for drilling is the same as that shown in FIGS. (Omitted) is formed integrally with the mounting portion 2.

  The attachment portion 2 in FIG. 6 is provided with an attachment hole 9 penetrating from one side surface to the other side surface, a countersunk clamp screw 12c is passed through the attachment hole 9, and the attachment portion 2 is attached to the bite holder 10 with the clamp screw 12c. Secure to. The tool holder 10 is provided with a tip seat 11 on the upper surface, and the tip seat 11 restrains the surface 2b of the mounting portion 2 and the surfaces 2f and 2g, which intersect each other at right angles to the surface 2b. Hold away chip 1D. The surfaces 2f and 2g are surfaces that intersect at an acute angle, and a wedge effect is generated in the attachment portion 2 during processing to improve the stability of fixation.

  7 also passes the clamp screw 12c through the attachment hole 9, and fastens the clamp screw 12c to fix the throw-away tip 1E to the bite holder 10. The surface 2b of the attachment portion 2 and the three surfaces 2f and 2g are restrained and fixed by the tip seat 11 provided on the side surface of the tool holder 10. Here, the surfaces 2f and 2g are at right angles to each other, and a wedge effect cannot be obtained, but such a mounting portion can also be employed.

  1 to 4 and the throw-away tip 1E shown in FIG. 7 have the same orientation as that shown in FIG. 6A, that is, the surface 2a of the mounting portion 2 is upward and parallel to the surface 2a. You may make it mount | wear to the chip seat 11 provided in the upper surface of the bite holder 10 so that the surface 2b may become the downward direction. The comb blade type lathe described at the beginning sets the tool with a holder on the tool post at a narrow interval. Therefore, when the tightening screw 12b and the clamp screw 12c are operated from the side, the holder set on the tool post is temporarily removed. It may be necessary to remove the work. In such a case, if the mounting direction is changed by 90 ° so that the chip can be attached and detached from the upper side, the trouble of attaching and detaching the holder can be saved, which is advantageous in terms of workability and lathe operating rate. .

  As described above, the throw-away tip according to the present invention is provided with a shaft portion integrated with the mounting portion, and the shaft portion is provided with the body of a drilling tool for drilling that has been held by a conventional drill holder. It is possible to drill holes with a lathe using a common tool holder. For this reason, the types of tool holders to be used can be integrated, and the number of holders prepared by the user is reduced, which is economically advantageous.

(A) side view, (b) plan view, (c) front view, (d) enlarged side view of essential parts, (e) enlarged front view showing an example of the throw-away tip of the present invention Side view showing another example of the throw-away tip of the present invention (A) Side view showing still another example of the throw-away tip of the present invention, (b) Front view (A) Side view showing still another example of the throw-away tip of the present invention, (b) Front view FIG. 1A is a plan view, FIG. 1B is a side view, and FIG. 1C is a sectional view taken along line XX in FIG. (A) a side view of a state in which a throw-away tip of still another example of the present invention is mounted on a bite holder, (b) a plan view (A) a side view of a state in which a throw-away tip of still another example of the present invention is mounted on a bite holder, (b) a plan view

Explanation of symbols

1, 1A to 1E Throw away tip 2 Mounting portion 2a to 2d, 2f, 2g Surface 2e Tapered surface 3 Shaft portion 4 Drill 4a Cutting edge 4b Twist groove 5 Center hole drill 6 Chamfering milling cutter 7 Reamer 8 Protrusion 9 Mounting hole 10 Byte holder 11 Tip seat 11a Seat bottom 11b, 11c Seat wall 12 Clamping means 12a Presser foot 12b Clamping screw 12c Clamp screw

Claims (2)

  An attachment portion that is detachably fixed to a tip seat provided on the bite holder by a clamping means; an attachment portion that extends from the attachment portion to the front of the attachment portion; and an integral shaft portion; A throw-away tip with the side configured as the body of a drilling tool.   The throw-away tip according to claim 1, wherein the turning tool is a drill, a center hole drill, a chamfering miller, or a reamer.

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