JP2012171075A - Formed cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a formed cutter capable of improving processing accuracy by preventing influence on a cutting object surface due to swarf by improving dischargeability of the swarf.SOLUTION: This formed cutter 1 includes, around a tool axis, a plurality of outer periphery cutting blades 21a, 21b each formed into a tapered form while alternately continuing projecting parts 41, 42, 43 each bulging in a projecting shape to the outer side in a tool radial direction and recessed parts 31, 32, 33 each hollowing in a recessed shape to the inner side in the tool radial direction as approaching the tool tip side, wherein cutting chips 61, 62, 63 are detachably mounted at edges on the tool tip side of rake faces 51 in the projecting parts 41, 42, 43 of the outer periphery cutting blades 21a, and cutting chips 71, 72, 73 are detachably mounted at edges on the tool base end side of the rake surfaces 51 in the projecting parts 41, 42, 43 of the outer periphery cutting blades 21b.

Description

  The present invention relates to a general-purpose milling cutter in which cutting performance is improved by appropriately setting a mounting position of a cutting tip.

  Conventionally, a general-purpose milling cutter has been provided as a tool capable of cutting a workpiece into a special shape including a curve or a straight line. Among these, for example, a general-purpose milling cutter for cutting a blade root portion of a turbine blade and a turbine shaft groove into which the blade root portion is fitted is particularly well known.

  The above-described general-purpose milling cutter includes a plurality of outer peripheral cutting edges whose cutting edge contour shape forms a Christmas tree shape corresponding to the shape of the blade root portion of the turbine blade or the groove of the turbine shaft. In other words, the outer peripheral cutting edge is formed such that the diameter of the cutting edge gradually becomes smaller while increasing or decreasing as it goes toward the tool tip side. And such a general-purpose milling machine is disclosed by patent document 1, for example.

JP 2009-274173 A

  In the above-described conventional general-purpose milling cutter, the outer peripheral cutting edge is composed of a convex portion that bulges outward in the tool radial direction and a concave portion that is concave inward in the tool radial direction, and each of the convex portion and the concave portion. In addition, a cutting tip is attached.

  Here, as described above, when one cutting tip is attached over the entire area of the convex portion, chips generated by this cutting tip follow the convex shape of the convex portion, the top side thereof, It flows from the upper slope side and the lower slope side toward the tool axis side.

  However, when chips generated by one cutting tip flow from a plurality of directions, the chips flowing from the respective directions interfere with each other, so that chip discharge performance is deteriorated. Thereby, the influence on the to-be-cut surface by a chip becomes large, and there exists a possibility that processing accuracy may fall.

  Therefore, the present invention solves the above-mentioned problem, and provides a general-purpose milling cutter that can improve machining accuracy by improving chip discharge and suppressing the influence of chips on the surface to be cut. The purpose is to do.

A general-purpose milling machine according to the first invention for solving the above-mentioned problems is as follows.
It is formed in a tapered shape, with the convex part bulging convexly toward the outer side in the tool radial direction and the concave part recessed concavely toward the inner side in the tool radial direction, being alternately linked toward the tool tip side. A general-purpose milling cutter having a plurality of peripheral cutting edges around the tool axis,
The outer peripheral cutting edge to which the first cutting tip is detachably attached to the tool tip side edge of the rake face in the convex portion;
The outer peripheral cutting edge to which the second cutting tip is detachably attached is provided at the tool base end side edge portion of the rake face in the convex portion.

The general-purpose milling machine according to the second invention for solving the above-mentioned problems is
The first cutting tip is mounted so as to be flush with the rake face and along a flank that forms the outer peripheral surface of the convex portion on the tool tip side,
The second cutting tip is mounted so as to be flush with the rake face and along a flank that forms the outer peripheral surface of the convex portion on the tool base end side.

A general-purpose milling cutter according to a third invention for solving the above-mentioned problem is as follows.
The first cutting tip is mounted so as to be flush with the flank and to form a tool tip side outer peripheral surface of the convex portion,
The second cutting tip is mounted so as to be flush with the flank and to form a tool base side outer peripheral surface of the convex portion.

  Therefore, according to the general-purpose milling machine according to the present invention, the first cutting tip and the second cutting tip are detachably attached to the tool tip side edge and the tool base side edge of the rake face in the convex portion. Each outer peripheral cutting edge to be provided is provided. Thereby, since the discharge | emission property of chips can be improved, the influence on the to-be-cut surface by chips can be suppressed. As a result, processing accuracy can be improved.

It is a side view of the total form milling machine concerning the 1st example of the present invention. It is AA arrow sectional drawing of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the principal part enlarged view of the whole shape milling machine which concerns on 1st Example of this invention, Comprising: (a) is the figure which showed the outer periphery cutting edge with which the chip | tip for cutting was attached to the tool front end side edge of a convex part, b) is a diagram showing an outer peripheral cutting edge in which a cutting tip is attached to the tool base end side edge of the convex portion. It is a side view of the total form milling machine concerning the 2nd example of the present invention. It is a BB arrow sectional view of Drawing 4. It is the principal part enlarged view of the general-purpose milling machine concerning 2nd Example of this invention, Comprising: (a) is the figure which showed the outer periphery cutting edge with which the chip | tip for cutting was attached to the tool front end side edge of a convex-shaped part, b) is a diagram showing an outer peripheral cutting edge in which a cutting tip is attached to the tool base end side edge of the convex portion.

  Hereinafter, the general-purpose milling machine according to the present invention will be described in detail with reference to the drawings.

  First, a general-purpose milling cutter according to a first embodiment of the present invention will be described in detail with reference to FIGS. Note that the arrows shown in FIG. 2 indicate the rotation direction of the general-purpose milling cutter, and the arrows shown in FIGS. 3A and 3B indicate the flow direction of the generated chips.

  As shown in FIGS. 1 and 2, the general-purpose milling cutter 1 is, for example, a Christmas cutter, and includes a shank portion 11 on the tool proximal end side and a blade portion 12 on the tool distal end side. Further, the blade portion 12 has outer peripheral cutting edges 21 a and 21 b, a tip cutting edge 22, and a chip discharge groove 23.

  The outer peripheral cutting edges 21a and 21b are provided at equiangular intervals around the tool axis and along the tool axis, and the edge diameter gradually increases and decreases toward the tool tip side. It is formed to have a small diameter. Further, the outer peripheral cutting edge 21a and the outer peripheral cutting edge 21b are alternately arranged around the tool axis, and concave portions (valley portions) 31, 32, 33 recessed concavely toward the inner side in the tool radial direction, Convex parts (mountain parts) 41, 42, 43 that bulge outwardly in the tool radial direction are provided. And the front-end | tip part of the outer periphery cutting blades 21a and 21b forms the front-end | tip cutting edge 22 by connecting mutually.

  In other words, the outer peripheral cutting edges 21a, 21b are formed in a tapered shape, connecting the concave portions 31, 32, 33 and the convex portions 41, 42, 43 alternately toward the tool tip side. The tip of each convex portion 43 forms a tip cutting edge 22. Thereby, the cutting edge outline shape of the outer peripheral cutting edges 21a and 21b is a Christmas tree shape. A chip discharge groove 23 is formed along the tool axis between the outer peripheral cutting edges 21a and 21b.

  The outer peripheral cutting edges 21 a and 21 b have a rake face 51, a flank face 52, and a back face 53. That is, the flank 52 forms the outer peripheral surface of the outer peripheral cutting edges 21a, 21b (the concave portions 31, 32, 33 and the convex portions 41, 42, 43). The cutting edge is formed by the corners of the rake face 51 and the flank face 52.

  Further, cutting tips (first cutting tips) 61, 62, 63 are detachable by bolts 64 at the edge of the tool tip side of the rake face 51 in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21 a. Is attached. Specifically, the cutting tips 61, 62, 63 are flush with the rake face 51, and along the flank 52 that forms the outer peripheral surface (inclined face) of the tool tip side of the convex portions 41, 42, 43. The bolts 64 are attached from the rake face 51 side to the rear face 53 side.

  On the other hand, cutting tips (second cutting tips) 71, 72, 73 are attached / detached by bolts 74 to the tool base end side edge of the rake face 51 in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21 b. It is attached as possible. Specifically, the cutting tips 71, 72, 73 are flush with the rake face 51 and the flank 52 that forms the tool base side outer peripheral surface (inclined surface) of the convex portions 41, 42, 43. It arrange | positions so that it may follow, and it attaches with the volt | bolt 74 toward the back surface 53 side from the rake face 51 side.

  In other words, in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21a, only the cutting tips 61, 62, 63 attached to the tool tip side edge portion can cut. Moreover, in the convex-shaped parts 41, 42, and 43 of the outer peripheral cutting edge 21b, only the cutting tips 71, 72, and 73 attached to the tool base side edge can cut.

  Therefore, by rotating the general-purpose milling cutter 1 around its axis in the direction orthogonal to the axis, the outer peripheral cutting edges 21a and 21b and the tip cutting edge 22 are rotated against the workpiece. And can process grooves in the shape of an inverted Christmas tree. Further, the chips generated by the outer peripheral cutting edges 21a and 21b and the tip cutting edge 22 flow toward the tool axis, and then are discharged by flowing in the chip discharge groove 23 toward the tool base end. .

  At this time, in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21a, the cutting tips 61, 62, 63 are attached only to the tool tip side edge portion of the rake face 51 in the convex portions 41, 42, 43. Therefore, chips are generated only by the cutting edges of the cutting tips 61, 62, 63. Further, in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21b, the cutting tips 71, 72, 73 are attached only to the tool base end side edge portion of the rake face 51 in the convex portions 41, 42, 43. Therefore, chips are generated only by the cutting edges of the cutting tips 71, 72, 73.

  Thereby, as shown in FIGS. 3A and 3B, the cutting (flowing) direction of the chips is changed in the convex portions 41, 42, 43 of the outer peripheral cutting edges 21 a, 21 b. , 63, 71, 72, 73 can be made only in one direction, so that the generated chips can be discharged more efficiently. As a result, since the influence of the workpiece on the surface to be cut due to the chips can be suppressed, the machining accuracy can be improved.

  Next, a general-purpose milling cutter according to a second embodiment of the present invention will be described in detail with reference to FIGS. In addition, about the member same as 1st Example, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Moreover, the arrow shown in FIG. 5 has shown the rotation direction of the general-purpose milling cutter, and the arrow shown to FIG. 6 (a), (b) has shown the flow direction of the generated chip.

  As shown in FIGS. 4 and 5, cutting tips (first cutting tips) 81, 82, 82 are provided on the tool tip side edge of the rake face 51 in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21 a. 83 is detachably attached by a bolt 84. Specifically, the cutting tips 81, 82, 83 are arranged so as to be flush with the flank 52 and form the tool tip side outer peripheral surface (inclined surface) of the convex portions 41, 42, 43. The bolt 84 is attached from the flank 52 side toward the tool axis side.

  On the other hand, cutting tips (second cutting tips) 91, 92, 93 are attached and detached by bolts 94 to the tool base end side edge of the rake face 51 in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21 b. It is attached as possible. Specifically, the cutting tips 91, 92, 93 are arranged so as to be flush with the flank 52 and form the tool base end side outer peripheral surface (inclined surface) of the convex portions 41, 42, 43. The bolt 94 is attached from the flank 52 side toward the tool axis side.

  That is, in the convex portions 41, 42, and 43 of the outer peripheral cutting edge 21a, only the cutting tips 81, 82, and 83 attached to the edge portion on the tool tip side can cut. Moreover, in the convex-shaped parts 41, 42, and 43 of the outer peripheral cutting edge 21b, only the cutting tips 91, 92, and 93 attached to the tool base side edge can cut.

  Therefore, in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21a, the cutting tips 81, 82, 83 are attached only to the tool tip side edge portion of the rake face 51 in the convex portions 41, 42, 43. Therefore, chips are generated only by the cutting edges of the cutting tips 81, 82, 83. Further, in the convex portions 41, 42, 43 of the outer peripheral cutting edge 21b, the cutting tips 91, 92, 93 are attached only to the tool base end side edge portion of the rake face 51 in the convex portions 41, 42, 43. Therefore, chips are generated only by the cutting edges of the cutting tips 91, 92, 93.

  Accordingly, as shown in FIGS. 6A and 6B, in the convex portions 41, 42, and 43 of the outer peripheral cutting edges 21 a and 21 b, the chip flow (generation) direction is set to the cutting tips 81 and 82. , 83, 91, 92, 93 can be made only in one direction, and thus the generated chips can be discharged more efficiently. As a result, since the influence of the workpiece on the surface to be cut due to the chips can be suppressed, the machining accuracy can be improved.

  The present invention can be applied to a general-purpose milling machine to which a cutting tip can be easily assembled.

DESCRIPTION OF SYMBOLS 1 General-purpose milling cutter 11 Shank part 12 Blade part 21a, 21b Peripheral cutting edge 22 Tip cutting edge 23 Chip discharge groove 31-33 Concave part 41-43 Convex part 51 Rake face 52 Relief face 53 Back face 61-63, 71-73 , 81-83, 91-93 Cutting tips 64, 74, 84, 94 bolts

Claims (3)

It is formed in a tapered shape, with the convex part bulging convexly toward the outer side in the tool radial direction and the concave part recessed concavely toward the inner side in the tool radial direction, being alternately linked toward the tool tip side. A general-purpose milling cutter having a plurality of peripheral cutting edges around the tool axis,
The outer peripheral cutting edge to which the first cutting tip is detachably attached to the tool tip side edge of the rake face in the convex portion;
An overall shape milling machine comprising the outer peripheral cutting edge to which a second cutting tip is detachably attached to a tool base end side edge portion of a rake face in the convex portion. The overall milling cutter according to claim 1,
The first cutting tip is mounted so as to be flush with the rake face and along a flank that forms the outer peripheral surface of the convex portion on the tool tip side,
The second milling tip is mounted so as to be flush with the rake face and along a flank that forms the outer peripheral surface of the convex portion on the tool base side. The overall milling cutter according to claim 1,
The first cutting tip is mounted so as to be flush with the flank and to form a tool tip side outer peripheral surface of the convex portion,
The second cutting tip is flush with the flank and is attached so as to form a tool base end side outer peripheral surface of the convex portion.

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