JP2010240796A - Raw material for cutting tool, composite raw material, and manufacturing method for the cutting tool and the raw material for the cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a raw material for a cutting tool, a composite raw material, and a manufacturing method for the cutting tool and the raw material for the cutting tool for facilitating manufacturing while preventing relative rotation of the raw material for the cutting tool and a shank part around a shaft without fail, reducing manufacturing cost, achieving excellent precision in cutting work stably, and prolonging a service life of the tool. <P>SOLUTION: This raw material 10 for the cutting tool has a shaft-like shape and is supported on the shank part by inserting its one end into a hole part in the shank part. A rotation regulation part 12 having a cross section crossing the axial direction orthogonally and having a non-truly round shape is formed at the one end. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cutting tool material, a composite material including the cutting tool material and a shank portion, a cutting tool formed by forming a cutting blade on the composite material, and a method for manufacturing the cutting tool material.

Conventionally, as a composite material used for a cutting tool such as a drill, for example, those described in Patent Documents 1 and 2 are known.
In general, the composite material is made of a material for a cutting tool made of a hard material such as a cemented carbide and a shaft, and is made larger in diameter than the material for the cutting tool made of a shaft. It consists of a shank made of inexpensive material.

Then, the outer peripheral surface at one end of the cutting tool material is polished with high precision, and the outer diameter of the one end is slightly larger than the inner diameter of the hole formed in the shank, and the one end is formed in the hole. It is trying to press fit into the part. As described above, the cutting tool material is press-fitted into the hole of the shank portion, thereby restricting relative rotation around the axis between the cutting tool material and the shank portion.
In the composite material thus formed, a cutting tool such as a drill is manufactured by forming a cutting edge at the other end opposite to the one end of the cutting tool material.

Japanese Patent Laid-Open No. 10-217017 JP 2002-18623 A

  However, the cutting tool material used for the composite material described above has the following problems. That is, before press-fitting one end of the cutting tool material into the hole of the shank, it is necessary to polish the cross section perpendicular to the axial direction at the one end into a highly accurate circular shape. Specifically, by accurately forming the cross section of the cutting tool material into a perfect circle, when one end of the cutting tool material is press-fitted into the hole of the shank portion, the one end and the hole portion The acting stress is set uniformly in the circumferential direction, thereby preventing the aforementioned relative rotation between the cutting tool material and the shank portion. However, in order to perform such high-precision polishing, the manufacturing process is complicated, and the manufacturing cost of the cutting tool material is increased.

  Further, as a method other than press-fitting one end of the cutting tool material into the hole of the shank, for example, the inner diameter of the hole is formed slightly larger than the outer diameter of the cutting tool material, and the one end is It is also conceivable to fit the one end and the hole using a press process such as a mechanical press or a caulking process such as drawing after insertion into the part. Specifically, the one end and the hole portion are subjected to plastic deformation (hereinafter may be abbreviated as “deformation”) so as to reduce the diameter of the inner peripheral surface of the hole portion of the shank portion by pressing or caulking. It is conceivable to fit each other. However, it cannot be said that a tight fitting state is reliably obtained, and it is difficult to reliably regulate the relative rotation around the axis of the cutting tool material and the shank portion.

  The present invention has been made in view of such circumstances, and can easily manufacture and reduce manufacturing costs while reliably preventing relative rotation around the axis of the cutting tool material and the shank. An object of the present invention is to provide a cutting tool material, a composite material, a cutting tool, and a manufacturing method of the cutting tool material that can perform cutting work accurately and stably and extend the tool life.

In order to achieve the above object, the present invention proposes the following means.
That is, the present invention is a cutting tool material that has an axial shape, one end of which is inserted into the hole of the shank portion and is supported by the shank portion, and the one end has a cross section orthogonal to the axial direction. A rotation restricting portion having a perfect circle shape is formed.

  According to the cutting tool material according to the present invention, a rotation regulating portion having a non-circular cross section perpendicular to the axial direction is formed at one end thereof inserted into the hole portion of the shank portion. When the composite material is formed by press-fitting the one end of the cutting tool material into the hole of the shank, or inserting the one end into the hole and applying press working or caulking, etc. The inner peripheral surface of the cutting tool is deformed so that the cross section orthogonal to the axial direction corresponds to the shape of the rotation restricting portion and becomes a non-circular shape, and is in close contact with the outer peripheral surface of the one end. Is reliably prevented from moving around the axis.

  Therefore, when cutting tools such as end mills and drills are manufactured by forming cutting blades on this composite cutting tool material, and this cutting tool is used for cutting, the cutting load around the axis is applied to the cutting tool. Even if it acts, the rotation restricting portion reliably restricts the relative rotation of the cutting tool material and the shank around the axis, so that the cutting can be performed with high accuracy and the tool life is extended.

  Further, as in the prior art, in order to restrict the relative rotation described above, the outer peripheral surface at the one end of the cutting tool material is polished in advance with high accuracy, and then the one end is press-fitted into the hole of the shank portion. Compared with the method, the manufacturing process is simplified and the manufacturing cost is greatly reduced.

Moreover, the raw material for cutting tools which concerns on this invention WHEREIN: The said rotation control part is good also as being a convex part extended along an axial direction while protruding from an outer peripheral surface.
Further, the present invention is the above-described method for manufacturing a cutting tool material, the step of disposing a base material between a pair of opposed dies, and bringing the dies close to each other, Is formed from the outer peripheral surface at a position corresponding to a direction orthogonal to the direction in which the molds face each other on the outer peripheral surface of the cutting tool material. And a step of forming the rotation restricting portion including a convex portion extending along the axial direction.

According to the cutting tool material according to the present invention, the rotation restricting portion is a convex portion that protrudes from the outer peripheral surface of the cutting tool material and extends along the axial direction. The inner peripheral surface of the hole is plastic corresponding to the shape of the convex part when it is press-fitted into the hole of the part, or one end is inserted into the hole and subjected to press working or caulking. The one end and the hole are closely fitted to each other by being deformed and recessed and engaged so as to be in close contact with the convex portion. Since the projecting portion thus engaged and the inner peripheral surface of the hole portion come into contact with each other and become resistance, the above-described relative rotation between the cutting tool material and the shank portion is reliably restricted. .
Further, since the rotation restricting portion is formed of such a convex portion, the convex portion can be easily formed when the cutting tool material is formed by press working such as a mechanical press or extrusion.

  Further, according to the method for manufacturing a cutting tool material according to the present invention, when the base material is pressed into a shape of the cutting tool material, the molds on the outer peripheral surface of the cutting tool material are Since a rotation restricting portion made of a convex portion protruding from the outer peripheral surface and extending along the axial direction is formed at a position corresponding to a direction orthogonal to the facing direction, it can be formed by pressing such as an existing mechanical press. The rotation restricting portion can be easily formed.

  That is, in a state where the pair of molds are closest to each other, the corresponding positions between the molds are provided with, for example, a concave portion that is filled with a base material to form a convex portion. During processing, the concave portion is filled with the base material and the convex portion is easily formed. Therefore, the cutting tool material having the rotation restricting portion can be easily manufactured, and the manufacturing cost is greatly reduced.

  Further, in the cutting tool material according to the present invention, a plurality of the convex portions may be formed, and may be arranged around the axis at intervals.

  According to the cutting tool material according to the present invention, a plurality of convex portions are formed on the outer peripheral surface of the cutting tool material, and these convex portions are arranged with an interval around the axis. The convex portions and the inner peripheral surfaces of the hole portions of the shank portion are engaged with each other, so that the above-described resistance can be sufficiently ensured, and the relative rotation between the cutting tool material and the shank portion is more reliably regulated. .

  Further, in the cutting tool material according to the present invention, the convex portion is disposed on one end side along the axial direction of the first protrusion and the first protrusion and has a height protruding from the outer peripheral surface. It is good also as having the 2nd protrusion higher than 1 protrusion, and the step part formed between the said 1st, 2nd protrusion.

  According to the cutting tool material according to the present invention, the first and second protrusions having different protrusions protruding from the outer peripheral surface, and the step formed between the first and second protrusions, Therefore, when one end of this cutting tool material is inserted into the hole of the shank part and fitted by pressing or caulking, the inner peripheral surface of the hole part corresponds to the shape of the convex part. The one end and the hole are tightly fitted to each other by being plastically deformed and recessed and engaged so as to be in close contact with the convex portion. Specifically, the inner peripheral surface of the hole is recessed in a multi-step shape corresponding to the shapes of the first and second protrusions and the step portion of the convex portion.

  Since the projecting portion thus engaged and the inner peripheral surface of the hole portion come into contact with each other and become resistance, relative rotation around the axis between the cutting tool material and the shank portion is reliably restricted. Further, since the second protrusion is arranged on one end side along the axial direction of the first protrusion in the convex portion, the stepped portion faces the other end side in the axial direction, and the stepped portion has an inner portion of the hole portion. A peripheral surface contacts and becomes resistance, and the relative movement along the axial direction of the cutting tool material and the shank portion is restricted. In particular, the cutting tool material is reliably prevented from slipping out from the hole portion of the shank portion to the other end side along the axial direction.

Further, in the cutting tool material according to the present invention, the convex portion is formed in a tapered shape in which a width along the circumferential direction of the outer peripheral surface gradually decreases from one end side along the axial direction toward the other end side. It is good to be.
Further, in the cutting tool material according to the present invention, the convex portion is formed in a tapered shape in which the height protruding from the outer peripheral surface gradually decreases from one end side to the other end side along the axial direction. It is good as well.

  According to the cutting tool material according to the present invention, since the convex portion is formed in a tapered shape as described above, one end of the cutting tool material is inserted into the hole of the shank portion, and press working or caulking processing is performed. When fitted together, the inner peripheral surface of the hole is plastically deformed and recessed corresponding to the shape of the convex part, and is engaged so as to be in close contact with the convex part, and the one end and the hole part Fit tightly. That is, the inner peripheral surface of the hole is recessed in a tapered shape corresponding to the tapered shape of the convex portion. Since the projecting portion thus engaged and the inner peripheral surface of the hole portion come into contact with each other and become resistance, relative rotation around the axis between the cutting tool material and the shank portion is reliably restricted. Here, the convex portion has a tapered shape in which the width along the circumferential direction of the outer peripheral surface gradually decreases from one end side to the other end side along the axial direction, or the height protruding from the outer peripheral surface gradually decreases. Therefore, the cutting tool material is reliably prevented from coming out from the hole of the shank portion to the other end side along the axial direction.

  In the cutting tool material according to the present invention, the rotation restricting portion may have an elliptical cross section orthogonal to the axial direction.

  According to the cutting tool material according to the present invention, the rotation restricting portion has an elliptical cross section orthogonal to the axial direction, so one end of the cutting tool material is press-fitted into the hole of the shank portion, When the one end is inserted into the hole part and pressed or crimped, etc., and fitted together, the inner peripheral surface of the hole part is plastically deformed corresponding to the elliptical shape of the rotation restricting part, resulting in a substantially elliptical cross section. And the one end and the hole are closely fitted to each other so as to be in close contact with the rotation restricting portion. Since the engaged rotation restricting portion and the inner peripheral surface of the hole portion come into contact with each other and become resistance, the aforementioned relative rotation between the cutting tool material and the shank portion is reliably restricted. Yes.

  Further, the composite material according to the present invention uses the above-described cutting tool material, and the one end and the hole portion are mutually connected in a state where the one end of the cutting tool material is inserted into the hole portion of the shank portion. It is characterized by being closely fitted.

  According to the composite material of the present invention, the rotation restricting portion is formed at one end of the cutting tool material. For example, the one end is press-fitted into the hole of the shank, or the one end is inserted into the hole. The one end and the hole are closely fitted to each other by performing press working or caulking. Therefore, relative rotation between the above-described cutting tool material and the shank portion is reliably restricted. Further, when this composite material is used as a cutting tool such as an end mill or a drill, the accuracy of the cutting process is stably secured and the tool life is extended.

  The cutting tool according to the present invention is characterized in that the composite material described above is used, and a cutting edge is formed on the other end of the composite material facing away from the one end of the cutting tool material.

  According to the cutting tool according to the present invention, the cutting blade formed on the composite cutting tool material accurately and stably cuts the workpiece, and the productivity is improved.

According to the cutting tool material, the composite material, and the cutting tool according to the present invention, relative rotation around the axis of the cutting tool material and the shank portion can be surely prevented, cutting can be performed accurately and stably, and the tool life Is extended.
Moreover, according to the manufacturing method of the raw material for cutting tools which concerns on this invention, manufacture of the raw material for cutting tools mentioned above can be performed easily, and manufacturing cost can be reduced.

It is a perspective view which shows the raw material for cutting tools which concerns on the 1st Embodiment of this invention. It is the front view and side view which show the raw material for cutting tools which concerns on the 1st Embodiment of this invention. It is a figure which shows the metal mold | die part of the press machine which manufactures the raw material for cutting tools which concerns on embodiment of this invention. It is a figure explaining the procedure which manufactures the raw material for cutting tools which concerns on embodiment of this invention. It is the side view and front view which show the shank part of the composite material which concerns on embodiment of this invention. It is a figure explaining the procedure which manufactures the composite raw material which concerns on the 1st Embodiment of this invention. It is a side view which shows the cutting-blade part of the cutting tool which concerns on embodiment of this invention. It is a perspective view which shows the raw material for cutting tools which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the raw material for cutting tools which concerns on the 3rd Embodiment of this invention. It is a figure explaining the procedure which manufactures the composite raw material which concerns on the 4th Embodiment of this invention. It is a figure explaining the procedure which manufactures the composite material which concerns on the 5th Embodiment of this invention.

The cutting tool material according to the embodiment of the present invention constitutes a composite material together with a shank portion, as will be described later. Further, by forming a cutting edge on the composite material, a cutting tool such as an end mill can be obtained.
For example, the cutting tool material is made of a hard material such as cemented carbide or cermet, and the shank portion is made of a metal material such as SUS, steel, or aluminum alloy that has a lower hardness and is relatively cheaper than the cutting tool material. .

First, a first embodiment of the present invention will be described.
As shown in FIGS. 1 and 2, the cutting tool material 10 according to the first embodiment has an axial shape, and a cross section perpendicular to the axial direction is formed in a substantially circular shape. A plurality of convex portions 11 that protrude from the outer peripheral surface and extend in the axial direction are formed on the outer peripheral surface of the cutting tool material 10. These convex portions 11 are formed over the entire length L1 along the axial direction of the cutting tool material 10, and the surface of the cutting tool material 10 facing away from the axial center is a flat surface 11A. .

  Moreover, these convex parts 11 are spaced apart from each other around the axis. In this embodiment, two convex portions 11 are formed at equal intervals along the circumferential direction of the outer peripheral surface, and the flat surfaces 11A of these convex portions 11 are arranged in parallel with the axis center in between. Has been. Further, by forming these convex portions 11, the cutting tool material 10 has a non-circular shape in cross section perpendicular to the axial direction, and these convex portions 11 serve as the rotation restricting portions 12. ing.

  Moreover, in FIG. 2, the full length L1 of the raw material 10 for cutting tools is set in the range of 20 mm-120 mm, for example. Moreover, the diameter d of the said outer peripheral surface is set in the range of 1 mm-13 mm. In addition, the outer dimension D1 perpendicular to the axial direction of the cutting tool material 10 is the same as or slightly larger than the diameter d described above, and is set within a range of 1 mm to 14 mm. Further, in the flat surface 11A of the convex portion 11, the dimension W in the short direction perpendicular to the axial direction is set within a range of 0.9 mm to 2.1 mm, and the dimension T from which the flat surface 11A projects from the outer peripheral surface is It is set within a range of 0.07 mm to 0.1 mm. Preferably, the ratio (W / d) of the dimension W to the diameter d is set within a range of 15% to 30%.

  For example, when the diameter d is set to 2 mm or more, the dimension W is set within ± 0.1 mm of the value calculated by 1+ (d−2.5) × 0.1. Is desirable. In this case, the dimension T is set to T≈0.1. In this embodiment, the total length L1 is about 24 mm, the diameter d and the outer dimension D1 are about 3.6 mm, the dimension W is about 1.05 mm, and the dimension T is about 0.1 mm. Has been.

Moreover, in this embodiment, the above-mentioned cutting tool material 10 is formed using a press machine 100 made of a mechanical press.
As shown in FIG. 3, the press machine 100 includes a pair of dies 101 and 102 that are arranged to face each other in the vertical direction. The molds 101 and 102 have a substantially rectangular parallelepiped shape, are spaced apart from each other, and have opposite processing surfaces 101A and 102A formed in a round groove shape. Specifically, the processing surfaces 101A and 102A have vertical cross-sections that are substantially semicircular arcs so as to be recessed from the outer peripheral surfaces of the molds 101 and 102, and are spaced parallel to each other in the horizontal direction. It extends.

  In FIG. 3, step portions 101B and 102B are provided at both end portions in the width direction of the processing surfaces 101A and 102A, that is, at both end portions in the direction in which the processing surfaces 101A and 102A extend and in the direction perpendicular to the vertical direction. Is formed. The step portions 101B and 102B are spaced apart from each other and extend parallel to the direction in which the processed surfaces 101A and 102A extend, and are formed in a strip shape.

Further, on the outer peripheral surfaces of the molds 101 and 102, the wall surfaces 101C and 102C facing outward in the width direction are in close contact with the wall surfaces 101C and 102C and slide along the surface direction with respect to the wall surfaces 101C and 102C. Each possible guide 103 is arranged.
FIG. 4 shows a main part of the press machine 100 in the AA cross section of FIG. 3, and as shown in FIG. , 102A facing outwardly in the extending direction, guides 104 that are in close contact with these wall surfaces 101D and 102D and are slidable along the surface direction with respect to the wall surfaces 101D and 102D are respectively disposed. Is done.

The molds 101 and 102 can be moved close to and away from each other in the vertical direction by a driving unit (not shown). When the molds 101 and 102 are separated from each other, the base material M of the cutting tool material 10 can be filled between the molds 101 and 102.
FIG. 3 shows a state in which the molds 101 and 102 are closest to each other. Thus, in a state in which the molds 101 and 102 are closest to each other, the processing surfaces 101A and 102A, the step portions 101B and 102B, A space surrounded by the guides 103 and 104 is set to form the outer shape of the cutting tool material 10.

Next, a procedure for manufacturing the cutting tool material 10 using the press machine 100 will be described.
First, in a state where the molds 101 and 102 are separated from each other, for example, a base material M obtained by kneading a binder with a powdery metal material is disposed between the molds 101 and 102. That is, as shown in FIG. 4A, in a state where the mold 101 is spaced upward with respect to the mold 102, a mother body is formed in a substantially rectangular parallelepiped hole-shaped space surrounded by the mold 102, the guide 103, and the guide 104. Fill material M.

Next, as shown in FIG. 4B, the mold 101 is moved closer to the mold 102, and the base material M is surrounded by the processing surfaces 101A and 102A, the step portions 101B and 102B, and the guides 103 and 104, The material M is compressed.
Further, as shown in FIG. 4C, the molds 101 and 102 are moved closer to the position where the machining surfaces 101A and 102A are closest to each other, the base material M is further compressed, and the base material M is used for a cutting tool. It is formed in the shape of the material 10.

  Specifically, when the molds 101 and 102 are brought close to each other and the base material M is pressed to form the shape of the cutting tool material 10, the base material M is processed surfaces 101A and 102A, stepped portions 101B and 102B, guides. It is formed in a substantially cylindrical shape corresponding to the shape surrounded by 103, 104, but protrudes from the outer peripheral surface at positions corresponding to both end portions in the width direction on the outer peripheral surface of the cutting tool material 10. At the same time, the rotation restricting portion 12 including the convex portion 11 extending along the axial direction is formed.

  That is, when the base material M is compressed as described above, as shown in FIG. 3, the base material M is also filled into the substantially rectangular parallelepiped hole-shaped concave portion 105 surrounded by the step portions 101B and 102B and the guides 103 and 104. At the same time, a convex portion 11 corresponding to the shape of the concave portion 105 is formed on the outer peripheral surface of the cutting tool material 10.

Next, as shown in FIG. 4 (d), the molds 101 and 102 and the guides 103 and 104 are relatively moved in the vertical direction without changing the distance between the molds 101 and 102, so that the machining surfaces 101A, The base material M arranged between 102A is positioned above the upper end portions of the guides 103 and 104.
Next, the mold 101 is separated from the mold 102 upward, the base material M formed in the shape of the cutting tool material 10 is exposed and taken out from the apparatus, and then sintered, so that the cutting tool material 10 is obtained. Manufactured.

Next, a composite material 80 using the cutting tool material 10 will be described.
The cutting tool material 10 is supported by the shank part 50 by inserting one end along the axial direction into the hole 51 of the shank part 50 shown in FIG. The composite material 80 includes the cutting tool material 10 and the shank portion 50.

  As shown in FIG. 5, the shank portion 50 has an axial shape or a cylindrical shape, and opens at an end face of the end portion at one end portion in the axial direction and faces inward in the axial direction. An extending cylindrical hole 51 is formed. In addition, a substantially conical hole-shaped space 51 </ b> A is formed in the innermost part of the hole 51. Further, the inner diameter D2 of the hole 51 is set to a dimension slightly smaller than the diameter d of the cutting tool material 10.

  In the present embodiment, the total length L2 along the axial direction of the shank portion 50 is set to be larger than the total length L1 of the cutting tool material 10.

Next, a procedure for manufacturing the composite material 80 using the cutting tool material 10 and the shank portion 50 described above will be described.
First, one end along the axial direction of the cutting tool material 10 shown in FIG. 1 is press-fitted into the hole 51 of the shank part 50 shown in FIG. 5 and closely fitted as shown in FIG.

  Specifically, the one end of the cutting tool material 10 is pressed against the hole 51 of the shank 50 so as to be coaxial, and pressed with a strong force. Then, the inner peripheral surface of the hole 51 is plastically deformed so as to be pushed and expanded little by little over the entire circumference, and one end of the cutting tool material 10 is pushed into the hole 51. Then, as shown in FIG. 6A, in the state where one end of the cutting tool material 10 is pushed to the innermost part of the hole 51, the press-fitting of the cutting tool material 10 into the shank portion 50 is completed, The cutting material 10 is supported by closely fitting one end thereof into the hole 51 of the shank 50. When the one end cuts the inner peripheral surface of the hole 51 and chips are generated, the chips are pushed into the innermost space 51 </ b> A of the hole 51 and stored.

  Next, as shown in FIG. 6B, the diameter of the end of the shank portion 50 on the side where the cutting tool material 10 in the axial direction is press-fitted is gradually increased from the outer side toward the inner side in the axial direction. The taper surface 54 is formed. In the illustrated example, the tapered surface 54 has the outer diameter at the other end substantially the same as the outer diameter of the cutting tool material 10 and smoothly continues to the outer peripheral surface of the cutting tool material 10 at the other end. Yes. The length L4 along the axial direction of the tapered surface 54 is set to be equal to or shorter than the length L3 along the axial direction of the hole 51 of the shank 50. That is, in the illustrated example, the length of one end portion inserted into the hole 51 in the cutting tool material 10 is L3, and this length L3 is set to be greater than the length L4.

  Thus, the composite material 80 including the cutting tool material 10 and the shank portion 50 is manufactured. In the illustrated example, more than half of the total length L1 along the axial direction of the cutting tool material 10 is inserted into the hole 51 of the shank 50.

Next, a procedure for manufacturing the cutting tool 95 using the composite material 80 will be described.
As shown in FIG. 7, a substantially spiral cutting blade 96 is formed on the outer peripheral surface of the cutting tool material 10 of the composite material 80. Specifically, the cutting edge 96 is formed on the exposed outer peripheral surface of the cutting tool material 10 at least at the other end portion along the axial direction (that is, the end portion opposite to the one end).
In the illustrated example, a cutting blade 96 is formed on the cutting tool material 10 to form a cutting tool 95 made of an end mill.

  As described above, according to the cutting tool material 10 according to the present embodiment, the rotation restriction in which the cross section orthogonal to the axial direction forms a non-circular shape at one end thereof inserted into the hole 51 of the shank 50. Since the part 12 is formed, when the one end of the cutting tool material 10 is press-fitted into the hole 51 of the shank part 50 and the one end and the hole 51 are fitted together to form the composite material 80, Since the inner peripheral surface of the portion 51 corresponds to the shape of the rotation restricting portion 12 and the cross section orthogonal to the axial direction is deformed so as to be a non-circular shape, it is in close contact with the outer peripheral surface of the one end. 10 and the shank part 50 are reliably prevented from relatively moving around the axis.

  Therefore, when the cutting tool 96 is formed on the cutting tool material 10 of the composite material 80 to produce the cutting tool 95, and the cutting tool 95 is used for cutting, the cutting load around the axis is applied to the cutting tool 95. Even if the rotation acts, the rotation restricting portion 12 reliably restricts the relative rotation around the axis of the cutting tool material 10 and the shank portion 50, so that the cutting can be performed with high accuracy and the tool life is extended.

  Further, as in the past, in order to restrict the relative rotation described above, the outer peripheral surface at the one end of the cutting tool material 10 is polished in advance with high accuracy, and then the one end is press-fitted into the hole 51 of the shank 50. In contrast to such a method, the manufacturing process is simplified and the manufacturing cost is greatly reduced.

Specifically, since the rotation restricting portion 12 is a convex portion 11 that protrudes from the outer peripheral surface of the cutting tool material 10 and extends in the axial direction, the one end of the cutting tool material 10 is connected to the shank portion 50. When press-fitting into the hole 51 and fitting, the inner peripheral surface of the hole 51 is plastically deformed and recessed corresponding to the shape of the convex portion 11 and is engaged so as to be in close contact with the convex portion 11. The one end and the hole 51 are closely fitted. Since the projecting portion 11 thus engaged and the inner peripheral surface of the hole portion 51 come into contact with each other and become resistance, the relative rotation between the cutting tool material 10 and the shank portion 50 is surely restricted. It has become.
Moreover, since the rotation control part 12 consists of such a convex part 11, when forming the base material M in the shape of the raw material 10 for cutting tools with the press machine 100, the convex part 11 can be formed easily.

  In addition, a plurality of convex portions 11 are formed on the outer peripheral surface of the cutting tool material 10, and these convex portions 11 are spaced apart from each other around the axis. The inner peripheral surfaces of the hole portions 51 of the shank portion 50 are engaged with each other to sufficiently secure the above-described resistance, and relative rotation between the cutting tool material 10 and the shank portion 50 is more reliably regulated.

  Further, according to the method for manufacturing the cutting tool material 10 according to the present embodiment, when the base material M is pressed into the shape of the cutting tool material 10, the outer peripheral surface of the cutting tool material 10 is formed. Since the rotation restricting portion 12 including the convex portion 11 that protrudes from the outer peripheral surface and extends along the axial direction of the cutting tool material 10 is formed at positions corresponding to both end portions in the width direction, The rotation restricting portion 12 can be easily formed by press working using the press machine 100.

  That is, in a state in which the pair of molds 101 and 102 are closest to each other, a substantially rectangular parallelepiped hole-shaped recess 105 surrounded by the step portions 101B and 102B and the guides 103 and 104 is formed between the molds 101 and 102. Since it is formed, the base material M is filled in the concave portion 105 during the pressing process, and the convex portion 11 corresponding to the shape of the concave portion 105 is easily formed. Therefore, the cutting tool material 10 provided with the rotation restricting portion 12 can be easily manufactured, and the manufacturing cost is greatly reduced.

Moreover, since the composite material 80 formed in this way is used as the cutting tool 95 made of an end mill, the accuracy of the cutting process is stably secured and the tool life is extended.
Further, the cutting edge 96 formed on the cutting tool material 10 of the composite material 80 cuts the workpiece with high accuracy and stability, and productivity is enhanced.

Next, a second embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the same member as above-mentioned embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 8, the cutting tool material 20 according to the second embodiment has an axial shape, and a cross section orthogonal to the axial direction is formed in a substantially circular shape. A plurality of convex portions 21 projecting from the outer peripheral surface and extending along the axial direction are formed on the outer peripheral surface of the cutting tool material 20. These convex portions 21 are formed over the entire length along the axial direction of the cutting tool material 20.

  The protrusion 21 is disposed on one end side along the axial direction of the first protrusion 22 and the first protrusion 22, and the height protruding from the outer peripheral surface of the cutting tool material 20 is higher than that of the first protrusion 22. A high second protrusion 23 and a stepped portion 24 formed between the first and second protrusions 22 and 23 are provided.

  Specifically, the second protrusion 23 and the stepped portion 24 are formed at one end portion along the axial direction on the outer peripheral surface of the cutting tool material 20, and the first protrusion 22 is a central portion along the axial direction on the outer peripheral surface. And the other end portion. The surface of the first protrusion 22 facing the side opposite to the axis center of the cutting tool material 20 is a plane 22A, and the surface of the second protrusion 23 facing the side opposite to the axis center is a plane 23A. .

  Moreover, these convex parts 21 are spaced apart from each other around the axis. In the present embodiment, two convex portions 21 are formed at equal intervals along the circumferential direction of the outer peripheral surface, and the planes 22A and 22A of these convex portions 21 and the planes 23A and 23A are They are arranged in parallel across the axis center. In addition, by forming these convex portions 21, the cutting tool material 20 has a non-circular cross section orthogonal to the axial direction, and these convex portions 21 serve as the rotation restricting portions 12. ing.

Next, a procedure for manufacturing the cutting tool material 20 will be described.
The cutting tool material 20 is manufactured using the press machine 100 as in the above-described embodiment.
In the press machine 100, the concave portion 105 surrounded by the step portions 101 </ b> B and 102 </ b> B and the guides 103 and 104 is set in a shape corresponding to the convex portion 21 in a state where the molds 101 and 102 are closest to each other.

After using this press machine 100 to place the base material M between the molds 101 and 102 in a state of being separated from each other, the mold 101 is brought closer to the mold 102 and the processing surfaces 101A and 102A The base material M is surrounded by the portions 101B and 102B and the guides 103 and 104, and the base material M is compressed.
Further, the molds 101 and 102 are moved closer to the position where the machining surfaces 101A and 102A are closest to each other, the base material M is further compressed, and the base material M is formed into the shape of the cutting tool material 20.

  Specifically, when the molds 101 and 102 are brought close to each other and the base material M is pressed to form the shape of the cutting tool material 20, the base material M is processed surfaces 101A and 102A, stepped portions 101B and 102B, guides. It is formed in a substantially cylindrical shape corresponding to the shape surrounded by 103 and 104, but protrudes from the outer peripheral surface at positions corresponding to both end portions in the width direction on the outer peripheral surface of the cutting tool material 20. In addition, the rotation restricting portion 12 including the convex portion 21 extending along the axial direction is formed.

In addition, as the shank portion 50, one having an inner diameter D2 of the hole portion 51 set to a dimension slightly larger than the outer dimension D1 of the cutting tool material 20 is used. Specifically, in the shank portion 50, the inner diameter D <b> 2 of the hole portion 51 is set slightly larger than the distance between the pair of flat surfaces 23 </ b> A in the second protrusion 23 of the cutting tool material 20.
Then, one end along the axial direction of the cutting tool material 20 is inserted into the hole 51 of the shank part 50, and in the state where the one end is abutted against the innermost part of the hole 51, the shank part 50 is The diameter is reduced by press working such as a mechanical press or caulking work such as drawing, and the inner diameter D2 of the hole 51 is reduced, so that the inner peripheral surface of the hole 51 is in close contact with the outer peripheral surface of the cutting tool material 20. The one end and the hole 51 are fitted to each other by plastic deformation.
In this way, the composite material 80 is manufactured.
Further, the cutting tool 95 is manufactured by forming the cutting edge 96 on the cutting material 20 of the composite material 80.

  As described above, according to the cutting tool material 20 according to the present embodiment, the protrusion 21 has the first and second protrusions 22 and 23 having different heights protruding from the outer peripheral surface, and the first and second protrusions. 2 has a step portion 24 formed between the protrusions 22 and 23. Therefore, one end of the cutting tool material 20 is inserted into the hole 51 of the shank portion 50 and is fitted by press working or caulking. When they are combined, the inner peripheral surface of the hole 51 is plastically deformed and recessed corresponding to the shape of the convex portion 21 and is engaged so as to be in close contact with the convex portion 21. Fit tightly. Specifically, the inner peripheral surface of the hole 51 is recessed in a multi-stage shape corresponding to the shapes of the first and second protrusions 22 and 23 of the convex part 21 and the step part 24.

Since the projecting portion 21 and the inner peripheral surface of the hole portion 51 that are engaged with each other come into contact with each other and become resistance, relative rotation around the axis between the cutting tool material 20 and the shank portion 50 is reliably restricted. . Further, since the second protrusion 23 is arranged on one end side along the axial direction of the first protrusion 22 in the convex portion 21, the step portion 24 faces the other end side in the axial direction. The inner peripheral surface of the hole 51 comes into contact with it to become a resistance, and the relative movement of the cutting tool material 20 and the shank 50 along the axial direction is restricted. In particular, the cutting tool material 20 is reliably prevented from slipping out from the hole 51 of the shank 50 to the other end side along the axial direction.
Moreover, since the rotation control part 12 consists of such a convex part 21, when forming the base material M in the shape of the raw material 20 for cutting tools with the press machine 100, the convex part 21 can be formed easily.

Next, a third embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the same member as above-mentioned embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 9, the cutting tool material 30 according to the third embodiment has an axial shape, and a plurality of convex portions 31 that protrude from the outer peripheral surface and extend along the axial direction are formed on the outer peripheral surface. Has been. These convex portions 31 are formed over the entire length of the cutting tool material 30 along the axial direction, and the surface of the cutting tool material 30 that faces away from the axial center is a flat surface 31A.

Moreover, these convex parts 31 are spaced apart from each other around the axis. In the present embodiment, two convex portions 31 are formed at equal intervals along the circumferential direction of the outer peripheral surface, and the flat surfaces 31A of these convex portions 31 are arranged in parallel with the axis center in between. Has been.
Moreover, the convex part 31 is formed in the taper shape which the width | variety along the circumferential direction of the said outer peripheral surface becomes narrow gradually as it goes to the other end side from the one end side along an axial direction. Specifically, the flat surface 31A of the convex portion 31 is formed in a substantially trapezoidal shape so that the dimension W in the short direction gradually decreases from one end side to the other end side.

  The dimension W at the end portion on one end side of the cutting tool material 30 is set within a range of more than 1 and 1.2 times or less than the dimension W at the end portion on the other end side. In the present embodiment, the dimension W at the end on one end side is set within a range of more than 1 and 1.1 times or less than the dimension W at the end on the other end side.

Further, by forming these convex portions 31, the cutting tool material 30 has a non-circular shape in a cross section orthogonal to the axial direction, and these convex portions 31 serve as the rotation restricting portion 12. ing.
In the illustrated example, the cutting tool material 30 is formed such that its diameter d gradually decreases from one end side to the other end side along the axial direction. Specifically, the diameter d at the end on one end side of the cutting tool material 30 is set within a range of 1.1 to 1.3 times the diameter d at the end on the other end side. In the present embodiment, the diameter d at the end on one end side is set to about 1.2 times the diameter d at the end on the other end side.

  In addition, the convex part 31 should just be formed in the taper shape, for example, the height T which the convex part 31 protrudes from the said outer peripheral surface gradually becomes low as it goes to the other end side from the one end side along an axial direction. It does not matter as being formed in a tapered shape. In this case, the height T at the end portion on one end side of the cutting tool material 30 is set within a range of more than 1 and 1.2 times or less than the height T at the end portion on the other end side. . More preferably, the height T at the end on one end side is set within a range of more than 1 and 1.1 times or less than the height T at the end on the other end side.

The cutting tool material 30 of the present embodiment is also manufactured using the press machine 100 as in the above-described embodiment.
In the press machine 100, the concave portion 105 surrounded by the step portions 101 </ b> B and 102 </ b> B and the guides 103 and 104 is set in a shape corresponding to the convex portion 31 in a state where the molds 101 and 102 are closest to each other.

After using this press machine 100 to place the base material M between the molds 101 and 102 in a state of being separated from each other, the mold 101 is brought closer to the mold 102 and the processing surfaces 101A and 102A The base material M is surrounded by the portions 101B and 102B and the guides 103 and 104, and the base material M is compressed.
Further, the molds 101 and 102 are brought closer to a position where the machining surfaces 101A and 102A are closest to each other, the base material M is further compressed, and the base material M is formed into the shape of the cutting tool material 30 from the apparatus. After taking out, it sinters and the cutting tool raw material 30 is manufactured.

In addition, as the shank portion 50, one having an inner diameter D2 of the hole portion 51 set to a dimension slightly larger than the outer dimension D1 of the cutting tool material 30 is used. Specifically, in the shank portion 50, the inner diameter D2 of the hole portion 51 is set slightly larger than the distance between the pair of flat surfaces 31A at the end portion on one end side of the cutting tool material 30.
Then, one end along the axial direction of the cutting tool material 30 is inserted into the hole 51 of the shank part 50, and in the state where the one end is abutted against the innermost part of the hole 51, the shank part 50 is The inner diameter D2 of the hole 51 is reduced by pressing or caulking, and the inner peripheral surface of the hole 51 is plastically deformed so as to be in close contact with the outer peripheral surface of the cutting tool material 30. And the hole 51 are fitted together.
In this way, the composite material 80 is manufactured.
Further, the cutting tool 95 is manufactured by forming the cutting edge 96 on the cutting material 30 of the composite material 80.

As described above, according to the cutting tool material 30 according to the present embodiment, since the convex portion 31 is formed in a tapered shape as described above, one end of the cutting tool material 30 is connected to the shank portion 50. The inner peripheral surface of the hole 51 is plastically deformed and recessed corresponding to the shape of the convex portion 31 and is in close contact with the convex portion 31 when being inserted into the hole portion 51 by press fitting or caulking. The one end and the hole 51 are closely fitted to each other. That is, the inner peripheral surface of the hole 51 is recessed in a tapered shape corresponding to the tapered shape of the convex portion 31. Since the engaged convex portion 31 and the inner peripheral surface of the hole portion 51 come into contact with each other and become resistance, the relative rotation around the axis between the cutting tool material 30 and the shank portion 50 is reliably restricted. . Here, the convex portion 31 gradually decreases in width along the circumferential direction of the outer peripheral surface (that is, the dimension W) from one end side to the other end side along the axial direction, or gradually protrudes from the outer peripheral surface. Since it is formed in the taper shape in which the height T becomes low, it is reliably prevented that the cutting tool material 30 slips out from the hole 51 of the shank portion 50 to the other end side along the axial direction.
Further, since the cutting tool material 30 is formed so that its diameter d gradually decreases from one end side to the other end side along the axial direction, the cutting tool material 30 is as described above. It is more reliably prevented from coming out.

Next, a fourth embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the same member as above-mentioned embodiment, and the description is abbreviate | omitted.

As shown in FIG. 10, the composite material 85 according to the fourth embodiment includes the cutting tool material 10 (20, 30) and the shank portion 60 described above.
The shank portion 60 has a substantially cylindrical shape, and a hole portion (hole portion) 61 that penetrates the shank portion 60 is formed along the axial direction. Further, the inner diameter D2 of the hole 61 is set to a dimension slightly smaller than the diameter d of the cutting tool material 10 (20, 30). In addition, in this embodiment, the full length L2 along the axial direction of the shank part 60 is set smaller than the full length L1 of the raw material 10 (20, 30) for cutting tools.

Next, a procedure for manufacturing the composite material 85 using the cutting tool material 10 (20, 30) and the shank portion 60 will be described.
First, one end along the axial direction of the cutting tool material 10 (20, 30) is press-fitted into the hole 61 of the shank portion 60 and closely fitted as shown in FIG.

  Specifically, one end of the cutting tool material 10 (20, 30) is pressed from the other end side so as to be coaxial with the hole portion 61 of the shank portion 60, and pressed with a strong force. Then, the inner peripheral surface of the hole 61 is plastically deformed so as to be pushed and expanded slightly over the entire circumference by the one end, and one end of the cutting tool material 10 (20, 30) is pushed into the hole 61. . Next, the cutting tool material 10 (20, 30) is further pushed into the hole 61 and the inner peripheral surface of the hole 61 is plastically deformed, as shown in FIG. The cutting tool material 10 (20, 30) is axially placed in the hole 61 so that the end surface on one end side of the working material 10 (20, 30) and the end surface on one end side of the shank portion 60 are flush with each other. Pierce along. Thus, the shank of the cutting tool material 10 (20, 30) in a state where the end face on one end side of the cutting tool material 10 (20, 30) and the end face on one end side of the shank portion 60 are flush with each other. The press-fitting into the portion 60 is completed, and the cutting material 10 (20, 30) is supported by tightly fitting one end and an axial center portion thereof to the hole portion 61 of the shank portion 60. In this state, the other end portion in the axial direction of the cutting tool material 10 (20, 30) is exposed to the outside.

Next, as shown in FIG. 10B, the other end portion along the axial direction on the outer peripheral surface of the shank portion 60 is formed on a tapered surface 64 that gradually increases in diameter from the other end side in the axial direction toward the one end side. To do. In the illustrated example, the tapered surface 64 has the outer diameter of the other end substantially the same as the outer diameter of the cutting tool material 10 (20, 30), and the cutting tool material 10 ( 20, 30).
Thus, the composite material 85 including the cutting tool material 10 (20, 30) and the shank portion 60 is manufactured.

  As described above, according to the composite material 85 according to the present embodiment, the hole 61 of the shank portion 60 that supports the cutting tool material 10 (20, 30) penetrates the shank portion 60 in the axial direction. Therefore, the resistance generated by the contact between the inner peripheral surface of the hole 61 and the outer peripheral surface of the cutting tool material 10 (20, 30) is greatly increased. Therefore, relative rotation around the axis and relative movement in the axial direction between the cutting tool material 10 (20, 30) and the shank portion 60 are reliably prevented. Further, since the cutting tool material 10 (20, 30) made of cemented carbide or the like is disposed over the entire length of the composite material 85, the rigidity of the composite material 85 is increased and sufficient strength against cutting load is ensured. The

Next, a fifth embodiment of the present invention will be described.
In addition, the same code | symbol is attached | subjected to the same member as above-mentioned embodiment, and the description is abbreviate | omitted.

As shown in FIG. 11, the composite material 90 according to the fifth embodiment includes a cutting tool material 40 and a shank portion 70.
The cutting tool material 40 of the present embodiment has a substantially multi-stage columnar shape, and one end portion along the axial direction is a small diameter portion 41, and the other end portion along the axial direction is a large diameter portion 42. Moreover, the taper surface 43 which is gradually diameter-reduced as it goes to the one end side from the other end side of an axial direction is formed in the center part along the axial direction of the raw material 40 for cutting tools. The small-diameter portion 41 of the cutting tool material 40 is formed with a plurality of convex portions (not shown) extending in the axial direction at intervals in the circumferential direction, and these convex portions are orthogonal to the axial direction. A rotation restricting portion 12 having a non-circular cross section is formed.

  Further, the shank portion 70 has a substantially cylindrical shape, and a hole portion 71 having a substantially cylindrical hole shape extending along the axial direction is formed in the other end portion so as to open to the end surface on the other end side. In addition, a tapered surface 72 is formed at the other end (that is, the opening) of the hole portion 71 so that the diameter gradually decreases from the end surface toward the one end side. The inner diameter D2 of the hole 71 is set to be slightly smaller than the diameter d of the small diameter portion 41 of the cutting tool material 40. Further, the outer diameter of the shank portion 70 is set to be slightly larger than the outer diameter of the cutting tool material 40.

Next, a procedure for manufacturing the composite material 90 using the cutting tool material 40 and the shank portion 70 described above will be described.
First, the small-diameter portion 41 of the cutting tool material 40 is press-fitted into the hole portion 71 of the shank portion 70 and closely fitted as shown in FIG.

  Specifically, one end of the small diameter portion 41 of the cutting tool material 40 is pressed against the hole portion 71 of the shank portion 70 so as to be pressed with a strong force. Then, the inner peripheral surface of the hole portion 71 is plastically deformed so as to be slightly expanded over the entire circumference by the one end, and one end of the cutting tool material 40 is pushed into the hole portion 71. Then, as shown in FIG. 11A, the taper surface 43 of the cutting tool material 40 is the tapered surface of the hole 71 in a state where one end of the cutting tool material 40 is pushed to the innermost part of the hole 71. The cutting tool material 40 is press-fitted into the shank portion 70 by being brought into contact with 72, and the cutting material 40 is supported by closely fitting one end thereof into the hole portion 71 of the shank portion 70.

Next, the outer peripheral surface of the shank part 70 is cut so that the outer diameter of the shank part 70 and the outer diameter of the large diameter part 42 in the cutting tool material 40 are the same as shown in FIG. To form. It should be noted that the outer peripheral surfaces of both the shank portion 70 and the cutting tool material 40 may be cut so that their outer diameters are the same. Thereby, these outer peripheral surfaces are connected to an axial direction, without forming a level | step difference or an inclined part between the outer peripheral surface of the raw material 40 for cutting tools, and the outer peripheral surface of the shank part 70. FIG.
Thus, the composite material 90 including the cutting tool material 40 and the shank portion 70 is manufactured.

  As described above, according to the composite material 90 according to the present embodiment, relative rotation around the axis between the cutting tool material 40 and the shank portion 70 is reliably prevented, as in the above-described embodiment. Further, the outer diameter of the cutting tool material 40 and the outer diameter of the shank portion 70 are formed to be the same, and a step or an inclined portion is formed between the outer peripheral surface of the shank portion 70 and the outer peripheral surface of the cutting tool material 40. Since these outer peripheral surfaces are connected to each other without cutting, a cutting tool 96 is formed on the cutting tool material 40 of the composite material 90 to manufacture a cutting tool 95, and the cutting tool 95 is used for cutting. At this time, chips and chips generated by cutting the workpiece do not hit the step or the inclined portion. Therefore, these chips and chips are discharged more smoothly, and cutting with the cutting tool 95 can be performed with high accuracy and stability.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the cutting tool 96 made of an end mill is formed by forming the cutting blade 96 in the composite material 80, 85, 90. However, the present invention is not limited to this. That is, the cutting tool 95 may be a drill other than an end mill having a cutting edge 96.

In the above-described embodiment, a plurality of convex portions are formed on the outer peripheral surface of the cutting tool material, but only one convex portion may be formed on the outer peripheral surface.
Moreover, although the convex part was formed over the full length along the axial direction of the raw material for cutting tools in the said outer peripheral surface, it is not limited to this. That is, since the convex part should just be formed in the end of the raw material for cutting tools inserted in the hole part of a shank part at least, it may be formed only in a part in the said outer peripheral surface.
Moreover, in the convex part, although the surface which faces the opposite side to the axial center of the raw material for cutting tools was made into the plane, the said surface may be formed in the curved surface.

  In addition, the various dimensions and angles such as the total length L1, the total length L2, the dimension W, the dimension T, the diameter d, the outer dimension D1, the inner diameter D2, the length L3, and the length L4 described in the above-described embodiments are arbitrary values. There is no limitation to the numerical ranges described.

  Further, the cutting tool material has been described as being formed using the press machine 100 made of a mechanical press (mechanical press). However, the present invention is not limited to this. For example, a press machine made of a hydraulic press is used. You may use. Moreover, it is good also as forming in the shape of the raw material for cutting tools by an extrusion process, without using such a press machine.

  In the above-described embodiment, the rotation restricting portion 12 has been described as a convex portion protruding from the outer peripheral surface of the cutting tool material 10, 20, 30, 40, but is not limited thereto. That is, the rotation restricting portion 12 only needs to be formed so that the cross section orthogonal to the axial direction has a non-circular shape and restricts relative movement of the cutting tool material and the shank portion around the axis. For example, the cross section orthogonal to the axial direction may be elliptical.

  As described above, when the rotation restricting portion 12 has an elliptical cross section perpendicular to the axial direction, one end of the cutting tool material is press-fitted into the hole portion of the shank portion, or the one end is inserted into the hole portion. When fitted by pressing or caulking, etc., the inner peripheral surface of the hole is plastically deformed corresponding to the elliptical shape of the rotation restricting portion and formed into a substantially elliptical hole shape in cross section. The one end and the hole are closely fitted to each other so as to be in close contact with the restricting portion. Since the engaged rotation restricting portion and the inner peripheral surface of the hole portion are brought into contact with each other and become resistance, the relative rotation between the cutting tool material and the shank portion is reliably restricted.

  In the first, fourth, and fifth embodiments, one end of the cutting tool material on which the rotation restricting portion 12 is formed is press-fitted into the hole of the shank portion to be closely fitted. The combined method is not limited to press-fitting. That is, instead of press-fitting, for example, the one end of the cutting tool material may be tightly fitted into the hole of the shank portion by performing the above-described press working or caulking, or otherwise. This method may be used.

10, 20, 30, 40 Cutting tool material 11, 21, 31 Convex portion 12 Rotation restricting portion 22 First protrusion 23 Second protrusion 24 Step portion 50, 60, 70 Shank portion 51, 71 Hole portion 61 Hole portion (hole Part)
80, 85, 90 Composite material 95 Cutting tool 96 Cutting blade 101, 102 Mold M Base material

Claims (10)

A material for a cutting tool that has an axial shape and is supported by the shank portion by inserting one end thereof into a hole portion of the shank portion,
A material for a cutting tool, wherein a rotation restricting portion having a non-circular shape in cross section perpendicular to the axial direction is formed at the one end. The cutting tool material according to claim 1,
The said rotation control part is a convex part which protrudes from an outer peripheral surface and extends along an axial direction, The cutting tool raw material characterized by the above-mentioned. The cutting tool material according to claim 2,
A material for a cutting tool, wherein a plurality of the convex portions are formed, and are arranged at intervals around an axis. The cutting tool material according to claim 2 or 3,
The convex portion is disposed on one end side along the axial direction of the first protrusion, the second protrusion having a height protruding from the outer peripheral surface higher than the first protrusion, and the first protrusion. And a stepped part formed between the second protrusions. The cutting tool material according to claim 2 or 3,
The material for a cutting tool, wherein the convex portion is formed in a tapered shape in which the width along the circumferential direction of the outer peripheral surface gradually decreases from one end side along the axial direction toward the other end side. The cutting tool material according to claim 2 or 3,
The material for a cutting tool, wherein the convex portion is formed in a taper shape with a height that gradually protrudes from the outer peripheral surface from one end side along the axial direction toward the other end side. The cutting tool material according to claim 1,
A material for a cutting tool, wherein the rotation restricting portion has an elliptical cross section perpendicular to the axial direction.   Using the cutting tool material according to any one of claims 1 to 7, in a state where the one end of the cutting tool material is inserted into the hole portion of the shank portion, the one end and the hole portion are A composite material characterized by being closely fitted together.   A cutting tool, wherein the composite material according to claim 8 is used, and a cutting blade is formed at the other end of the composite material facing away from the one end of the cutting tool material. It is a manufacturing method of the raw material for cutting tools as described in any one of Claim 1 to 6,
Placing a base material between a pair of opposed molds;
When these molds are brought close to each other and the base material is pressed to form the shape of the cutting tool material, the direction perpendicular to the direction in which the molds face each other on the outer peripheral surface of the cutting tool material And a step of forming the rotation restricting portion formed of a convex portion that protrudes from the outer peripheral surface and extends along the axial direction at a position corresponding to the above-described method.

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