JP2009196055A - Machining head removable tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machining head removable tool which assembles a body member and a machining head with high concentricity. <P>SOLUTION: A formed milling cutter 1 with a removable machining head comprises a removable grinding head 12 for grinding a workpiece, removably attached to a shank 11 rotated around the axis. An engaging hole 24 is formed on the tip end face 23 of the shank 11, and an engaging axis part 36 engaged with the engaging hole 24 is formed on the base end face 35 of the grinding head 12. A tapered face 25 tilted in relation to the axis of the shank 11 is formed on the engaging hole 24, and a tapered face 37 tilted according to the tapered face 25 is formed on the engaging axis part 36. A female screw part 26 of the engaging hole 24 is screw-connected to a male screw part 38 of the engaging axis part 36. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a machining head detachable tool that allows a machining head that performs predetermined machining on a workpiece to be attached to and detached from a body member such as a shank that is rotationally driven around an axis.

  In recent years, in a tool for performing predetermined processing on a workpiece, a main body member that is detachably attached to a rotating portion of a machine tool and a processing head provided at the tip of the main body member are separately provided. There is provided a tool for attaching and detaching a machining head which is configured and fitted to each other and integrally joined by screws, shrink fitting or the like. By making such a separate structure, only the processing head is made of an expensive material, the tool cost can be reduced as a whole, and when the processing part of the processing head is worn or chipped, Only the machining head can be exchanged, and the main body member can be made common to a plurality of types of machining heads.

  Such a conventional processing head detachable tool is disclosed in Patent Document 1, for example.

Utility Model Registration No. 3132125

  In the above-described conventional machining head detachable tool, the convex portion of the machining head is fitted into the concave portion of the main body member, and these are screw-joined using screws. As a result, the adhesion between the main body member and the machining head during assembly is improved, so that stable machining can be performed. However, in such a conventional configuration, although the adhesion between the main body member and the processing head is improved, the coaxiality may be lowered depending on the processing accuracy of the screw.

  Accordingly, an object of the present invention is to provide a machining head detachable tool capable of assembling the main body member and the machining head with high coaxiality.

A machining head detachable tool according to the first invention for solving the above-mentioned problems is as follows.
A processing head detachable tool for detachably mounting a processing head for performing predetermined processing on a workpiece on a main body member that is rotationally driven around an axis,
A convex convex portion is provided on one end surface of the main body member or the processing head, while a concave concave portion that fits the convex portion is provided on the other end surface of the processing head or the main body member. Provided,
A first tapered surface inclined with respect to the axis of the convex portion is formed on the outer wall of the convex portion, and a second tapered surface inclined corresponding to the first tapered surface is formed on the inner wall of the concave portion. And
The convex portion and the concave portion are joined by a joining means.

A machining head detachable tool according to the second invention for solving the above-mentioned problems is as follows.
In the processing head detachable tool according to the first invention,
The joining means is a screw part of the convex part and the concave part.

  According to the processing head detachable tool according to the present invention, the first tapered surface and the second tapered surface are fitted when the convex portion and the concave portion are joined when the main body member and the processing head are assembled. Thus, the main body member and the processing head can be assembled with high coaxiality.

  Hereinafter, a processing head detachable tool according to the present invention will be described in detail with reference to the drawings. In Examples 1 and 2 described below, the machining head detachable tool according to the present invention is applied to a general-purpose milling cutter used when a groove having a predetermined cross section is machined.

  FIG. 1 is an assembly cross-sectional view of an overall milling cutter according to a first embodiment to which a machining head detachable tool according to the present invention is applied, and FIG. 2 is a diagram showing a shank of the entire milling cutter. a) is a side view, (b) is a front view of the front end side, FIG. 3 is a view showing a cutting head of the overall milling cutter, (a) is a front view of the base end side, and (b) is a side view. (C) is the AA arrow sectional drawing of the figure (b).

  The general-purpose milling cutter 1 shown in FIGS. 1 to 3 includes a shank (main body member) 11 and a cutting head (processing head) 12 which are separately formed and integrated by screwing them together. . Further, in the general-purpose milling cutter 1, the shank 11 is detachably mounted on a rotating part of a machine tool such as a milling machine or a machining center through a tool holder (not shown) so that the shank 11 has its axis (described later). Are rotated around the axis Os, Oh) and moved in a direction orthogonal to the axis, and the cutting head 12 performs grooving.

  As shown in FIGS. 1 and 2, the shank 11 has a cylindrical tube portion 21 formed on the tool distal end side and a tapered attachment portion 22 formed on the tool proximal end side. The cylindrical portion 21 and the attachment portion 22 are coaxially and continuously formed integrally, and among these, the attachment portion 22 is held by the tool holder, and goes toward the tool tip side. The outer diameter is formed so as to gradually increase.

  Further, a concave fitting hole (concave portion) 24 is opened on the distal end surface 23 of the cylindrical portion 21 so as to be coaxial with the axial center Os of the shank 11, and on the inner peripheral surface of the fitting hole 24. The tapered surface 25 and the female thread portion 26 are formed continuously. The tapered surface 25 is disposed at a portion corresponding to the cylindrical portion 21 and is formed such that its inner diameter gradually increases toward the tool tip side. On the other hand, the internal thread portion 26 is disposed at a portion corresponding to the attachment portion 22, and an internal thread is formed on the inner peripheral surface thereof.

  On the other hand, as shown in FIGS. 1 and 3, the cutting head 12 has a blade portion 31. In the blade portion 31, four outer peripheral cutting edges 33 are formed at equal angular intervals around the axial center Oh of the cutting head 12 and along the axial center Oh. A chip discharge groove 32 is formed. These outer peripheral cutting edges 33 are formed such that the diameter of the cutting edge gradually decreases as the distance from the tool tip increases, and a bottom blade 34 is continuously formed at the tip. ing.

  A convex fitting shaft portion (convex portion) 36 is provided on the base end surface 35 of the blade portion 31 so as to be coaxial with the axial center Oh of the cutting head 12. The fitting shaft portion 36 is fitted into the fitting hole 24 of the shank 11 and has a tapered portion 37 and a cylindrical male screw portion 38. The tapered portion 37 is fitted with the tapered surface 25 of the fitting hole 24 and is formed so that its outer diameter gradually increases toward the tool tip side. The external thread portion 38 has a constant outer diameter and is screwed with the internal thread portion 26 of the fitting hole 24, and an external thread is formed on the outer peripheral surface thereof.

  The shaft center Os of the shank 11 corresponds to the shaft center of the overall milling cutter 1, and when the cutting head 12 is attached to the shank 11, the axial center Oh of the cutting head 12 is also the total milling cutter 1. This coincides with the axis (axis Os). The female screw portion 26 and the male screw portion 38 constitute a joining means.

  Therefore, when performing groove processing using the general-purpose milling cutter 1 according to the present invention, the general-purpose milling cutter 1 is first attached to the rotating part of the machine tool via the tool holder. Next, a groove having a predetermined cross-sectional shape is machined by moving the general-purpose milling cutter 1 around the axis Os (Oh) and moving it in a direction perpendicular to the axis Os by the rotating part. .

  When a predetermined number of grooves are processed and the blade 31 is worn or damaged, or when a groove having a different cross-sectional shape is processed, the cutting head 12 is removed from the shank 11, and a new cutting head is removed. Change to 12. At the time of such head replacement, the female screw portion 26 and the fitting shaft portion 36 of the fitting hole 24 are fitted with the shank 11 attached to the tool holder or with the shank 11 detached from the tool holder. The cutting head 12 is rotated and removed with respect to the shank 11 so as to release the screw joint with the screw portion 38.

  Subsequently, the fitting shaft portion 36 is fitted into the fitting hole 24 of the shank 11 while rotating the newly prepared cutting head 12. As a result, the male screw portion 38 of the fitting shaft portion 36 is screwed into the female screw portion 26 of the fitting hole 24, and the cutting head 12 is attached to the shank 11.

  At this time, when the female screw portion 26 and the male screw portion 38 are joined to each other, the taper surface 25 and the taper portion 37 are closely fitted to each other. For 36, a pulling force is generated such that the axial center Oh coincides with the axial center Os of the fitting hole 24. As a result, the shank 11 and the cutting head 12 are assembled with high coaxiality.

  As shown in FIG. 1, the tip end face 23 of the shank 11 and the base end face 35 of the cutting head 12 are not in close contact during assembly. Further, in order to easily attach and remove the cutting head 12, a notch or the like may be formed in the cutting head 12, and a spanner or a monkey wrench may be engaged with the notch.

  Therefore, according to the general-purpose milling cutter 1 according to the present invention, when the female screw portion 26 of the fitting hole 24 and the male screw portion 38 of the fitting shaft portion 36 are screw-joined, the tapered surface 25 and the tapered portion 37 are provided. , The shank 11 and the cutting head 12 can be assembled with high coaxiality.

  FIG. 4 is an assembly cross-sectional view of a general-purpose milling cutter according to a second embodiment to which the machining head detachable tool according to the present invention is applied, and FIG. 5 is a diagram showing a shank of the general-purpose milling cutter. a) is a side view, (b) is a front view of the front end side, FIG. 6 is a view showing a cutting head of the overall milling cutter, (a) is a front view of the base end side, and (b) is a side view. (C) is the BB arrow sectional drawing of the figure (b).

  4 to FIG. 6, the shank (main body member) 51 and the cutting head (processing head) 52 are configured separately and integrated by screwing them together. . Further, in the general-purpose milling cutter 2, the shank 51 is detachably mounted on a rotating part of a machine tool such as a milling machine or a machining center through a tool holder (not shown) so that the shank 51 has its axis (described later). Are rotated around the axis Os, Oh) and moved in a direction perpendicular to the axis, and the cutting head 52 performs grooving.

  As shown in FIGS. 4 and 5, the shank 51 has a cylindrical body portion 61 formed on the tool distal end side and a tapered attachment portion 62 formed on the tool proximal end side. The body portion 61 and the attachment portion 62 are coaxially and continuously formed integrally, and of these, the attachment portion 62 is held by the tool holder, and goes toward the tool tip side. The outer diameter is formed so as to gradually increase.

  Further, a convex fitting shaft portion (convex portion) 64 is provided on the distal end surface 63 of the body portion 61 so as to be coaxial with the axial center Os of the shank 51. The fitting shaft part 64 has a tapered part 65 and a cylindrical male thread part 66. The taper portion 65 is formed such that its outer diameter gradually decreases toward the tool tip side. The external thread 66 has a constant outer diameter, and an external thread is formed on the outer peripheral surface thereof.

  On the other hand, as shown in FIGS. 4 and 6, the cutting head 52 has a blade portion 71. In the blade portion 71, four outer peripheral cutting edges 73 are formed around the axial center Oh of the cutting head 52 at equal angular intervals and along the axial center Oh, and between the outer peripheral cutting edges 73. A chip discharge groove 72 is formed. These outer peripheral cutting edges 73 are formed such that the diameter of the cutting edge gradually increases and decreases toward the tool front end side, and further, a bottom blade 74 is continuously formed at the front ends thereof. ing.

  Further, a concave fitting hole (concave portion) 76 is opened on the base end surface 75 of the blade portion 71 so as to be coaxial with the axial center Oh of the cutting head 52. The fitting hole 76 is fitted with the fitting shaft portion 64 of the shank 51, and a tapered surface 77 and a female screw portion 78 are continuously formed on the inner peripheral surface thereof. The tapered surface 77 is fitted with the tapered portion 65 of the fitting shaft portion 64, and is formed such that its inner diameter gradually decreases toward the tool tip side. On the other hand, the female screw portion 78 is screwed with the male screw portion 66 of the fitting shaft portion 64, and a female screw is formed on the inner peripheral surface thereof.

  The shaft center Os of the shank 51 corresponds to the shaft center of the general-purpose milling cutter 2, and when the cutting head 52 is attached to the shank 51, the axial center Oh of the cutting head 52 is also the total milling cutter 2. This coincides with the axis (axis Os). The male screw portion 66 and the female screw portion 78 constitute a joining means.

  Therefore, when grooving is performed using the general-purpose milling cutter 2 according to the present invention, the general-purpose milling cutter 2 is first attached to the rotating part of the machine tool via the tool holder. Next, a groove having a predetermined cross-sectional shape is machined by moving the general-purpose milling cutter 2 around the axis Os (Oh) and moving it in a direction perpendicular to the axis Os by the rotating part. .

  When a predetermined number of grooves are processed and the blade portion 71 is worn or damaged, or when a groove having a different cross-sectional shape is processed, the cutting head 52 is removed from the shank 51 to create a new cutting head. Replace with 52. In such a head replacement, with the shank 51 attached to the tool holder or with the shank 51 detached from the tool holder, the threaded portion 66 of the fitting shaft portion 64 and the fitting hole 76 are fitted. The cutting head 52 is rotated and removed with respect to the shank 51 so as to release the screw joint with the screw portion 78.

  Next, the fitting shaft portion 64 of the shank 51 is fitted into the fitting hole 76 while rotating the newly prepared cutting head 52. As a result, the male thread portion 66 of the fitting shaft portion 64 is screwed into the female thread portion 78 of the fitting hole 76, and the cutting head 52 is attached to the shank 51.

  At this time, since the taper portion 65 and the taper surface 77 are closely fitted to each other when the male screw portion 66 and the female screw portion 78 are joined to each other, the fitting hole 76 is caused by the action of the taper surface. On the other hand, a pulling force is generated such that the axial center Oh coincides with the axial center Os of the fitting shaft portion 64. As a result, the shank 51 and the cutting head 52 are assembled with high coaxiality.

  As shown in FIG. 4, the tip end face 63 of the shank 51 and the base end face 75 of the cutting head 52 are not in close contact during assembly. Further, in order to facilitate attachment and removal of the cutting head 52, a notch or the like may be formed in the cutting head 52, and a spanner or a monkey wrench may be engaged with the notch.

  Therefore, according to the general-purpose milling cutter 2 according to the present invention, when the male screw portion 66 of the fitting shaft portion 64 and the female screw portion 78 of the fitting hole 76 are screw-joined, the tapered portion 65 and the tapered surface 77 are formed. And the shank 51 and the cutting head 52 can be assembled with high coaxiality. Further, by forming the fitting hole 76 in the cutting head 52, the material cost of the cutting head 52 can be suppressed as compared with the case where the fitting shaft portion 64 is formed in the cutting head 52.

  In the first and second embodiments described above, the machining head detachable tool according to the present invention is applied to a general-purpose milling cutter that performs cutting, but it can also be applied to end mills, drills, and the like. Moreover, as a tool, you may apply not only to the cutting tool which has a blade part which performs cutting, but to the grinding tool which has grinding parts, such as a grindstone which performs grinding.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a machining head detachable tool that can easily replace a machining head that performs predetermined machining on a workpiece with respect to a main body member that is rotationally driven around an axis.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled cross-sectional view of an overall milling cutter according to a first embodiment to which a machining head detachable tool according to the present invention is applied. It is the figure which showed the shank of the total form milling cutter which concerns on 1st Example of this invention, Comprising: (a) is a side view, (b) is a front end side front view. It is the figure which showed the cutting head of the general-purpose milling cutter which concerns on 1st Example of this invention, Comprising: (a) is a base end side front view, (b) is a side view, (c) is the figure (b). It is AA arrow sectional drawing. It is an assembly sectional view of a total form milling cutter concerning a 2nd example to which a processing head detachable tool concerning the present invention is applied. It is the figure which showed the shank of the total form milling cutter which concerns on 2nd Example of this invention, Comprising: (a) is a side view, (b) is a front end side front view. It is the figure which showed the cutting head of the total form milling cutter which concerns on 2nd Example of this invention, Comprising: (a) is a base end side front view, (b) is a side view, (c) is the figure (b). It is BB arrow sectional drawing of.

Explanation of symbols

1, 2 Overall milling cutter 11, 51 Shank 12, 52 Cutting head 21 Tube portion 22, 62 Mounting portion 23, 63 Tip surface 24, 76 Fitting hole 25, 77 Tapered surface 26, 78 Female thread portion 31, 71 Blade Portions 32, 72 Chip discharge grooves 33, 73 Peripheral cutting edges 34, 74 Bottom blades 35, 75 Base end surfaces 36, 64 Fitting shaft portions 37, 65 Taper portions 38, 66 Male thread portions 61 Body portions Os, Oh Axes

Claims (2)

A processing head detachable tool for detachably mounting a processing head for performing predetermined processing on a workpiece on a main body member that is rotationally driven around an axis,
A convex convex portion is provided on one end surface of the main body member or the processing head, while a concave concave portion that fits the convex portion is provided on the other end surface of the processing head or the main body member. Provided,
A first tapered surface inclined with respect to the axis of the convex portion is formed on the outer wall of the convex portion, and a second tapered surface inclined corresponding to the first tapered surface is formed on the inner wall of the concave portion. And
The processing head detachable tool, wherein the convex portion and the concave portion are joined by a joining means. In the processing head detachable tool according to claim 1,
The joining means is a threaded portion of the convex portion and the concave portion.

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