JP2020066087A - Method of manufacturing end mill - Google Patents

Abstract

To provide a method of manufacturing an end mill, which enables a cutting blade to be properly attached to a body by inhibiting the warpage of the cutting blade.SOLUTION: A method of manufacturing an end mill according to the present invention includes the steps of: cutting a cutting blade forming piece of a predetermined shape out of a base material, which has a base composed of an ultrahard material and a sintered diamond layer provided on one surface of the base, by electrical discharge machining or laser beam machining; obtaining a cutting blade by cutting the base of the cutting blade forming piece so as to decrease the thickness of the base; and attaching the cutting blade to the body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing an end mill.

  An end mill is widely known as one of cutting tools. An end mill typically has a main body that rotates about a rotation axis and a cutting blade attached to the surface of the main body.

JP, 2016-182658, A

  As a cutting blade of the end mill, it was examined to use a cutting blade having a base made of a superhard material and a sintered diamond layer provided on one surface of the base. When such a cutting blade is cut from the base material and attached to the end mill body, when the cutting blade warps during cutting, it becomes difficult to attach the cutting blade to the body due to the warping. There is.

  The present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to provide a method for manufacturing an end mill capable of suppressing warping of a cutting blade and satisfactorily attaching the cutting blade to a main body. Especially.

The present inventors have found that the heat shrinkage due to the laminated structure is different between the base side made of a superhard material and the sintered diamond layer side, so that the heat generated when cutting the base material causes warpage. I got to know. Then, the base material made of a superhard material is cut out of the base material thicker than usual, and by cutting the base after that, it is possible to produce a cutting blade that suppresses the warping of the cutting blade that occurs during cutting out, The present invention has been completed.
The manufacturing method of the end mill of the present invention is a cutting blade having a predetermined shape by electric discharge machining or laser machining from a base material having a base made of a superhard material and a sintered diamond layer provided on one surface of the base. Cutting out the forming piece; cutting the base of the cutting blade forming piece to reduce the thickness of the base to obtain a cutting blade; and attaching the cutting blade to the main body.
In one embodiment, the cutting blade forming piece has a thickness of 1.6 mm to 3.2 mm, and the cutting blade has a thickness of 0.7 mm to 1.6 mm.
In one embodiment, the base of the cutting blade forming piece has a thickness of 1.1 mm to 2.8 mm, and the base of the cutting blade has a thickness of 0.2 mm to 1.3 mm.
In one embodiment, the manufacturing method attaches the cutting blade to the main body by pasting.
In another embodiment, the manufacturing method attaches the cutting blade to the main body by embedding the cutting blade in an embedded portion provided in the main body. Further, in such a manufacturing method, the cutting blade is fixed to the embedding portion by vacuum brazing while the cutting blade is embedded in the embedding portion.
In one embodiment, cutting the base of the cutting blade forming piece includes polishing.

  According to the present invention, in a method for manufacturing an end mill in which a cutting blade having a base portion and a sintered diamond layer is attached to a main body, a cutting blade forming piece is cut out from a base material having a thick base portion, and the base portion of the cutting blade forming piece is cut. Then, by reducing the thickness of the base portion to obtain the cutting blade, it is possible to realize an end mill manufacturing method capable of suppressing the warp of the cutting blade and favorably attaching the cutting blade to the main body. As a result, an end mill excellent in cutting ability, strength and durability can be manufactured. According to the present invention, the material cost is increased by cutting the thick base portion to make it thin, but considering the attachability to the main body of the cutting blade and the resulting strength and durability, the overall manufacturing efficiency is excellent. It becomes a thing. That is, the present invention solves the problem by means that is never adopted in the technical common sense of the industry.

1A is a schematic sectional view illustrating an example of a base material of a cutting blade used in a manufacturing method according to an embodiment of the present invention, and FIG. 1B is a schematic view of the base material of FIG. 1A. It is a perspective view. FIG. 2A is a schematic plan view for explaining the cutting out of the cutting blade forming piece from the base material in the manufacturing method according to the embodiment of the present invention, and FIG. 2B is the cutting out of FIG. 1A. It is a schematic perspective view of a cutting blade formation piece. FIG. 6 is a schematic cross-sectional view explaining the production of the cutting blade in the manufacturing method according to the embodiment of the present invention. FIG. 4A is a schematic plan view illustrating an example of attaching the cutting blade to the main body in the manufacturing method according to the embodiment of the present invention, and FIG. 4B is a schematic plan view illustrating another example. is there. FIG. 5A is a schematic plan view illustrating an example of the end mill obtained by the embodiment of FIG. 4B, and FIG. 5B is a schematic perspective view of the end mill of FIG. 5A. It is a schematic plan view which shows an example of the shape of the non-linearly processed optical film which can be obtained by the manufacturing method of the optical film using the end mill obtained by the manufacturing method of this invention. It is a schematic perspective view for demonstrating the cutting process of the optical film using the end mill obtained by the manufacturing method of this invention. FIG. 8A to FIG. 8E are schematic plan views illustrating a series of procedures of a non-linear cutting process which is an example of the cutting process of the optical film using the end mill obtained by the manufacturing method of the present invention. Is.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. It should be noted that the drawings are schematically shown for easy understanding, and the ratios of lengths, widths, thicknesses, and the like, angles, and the like in the drawings are different from actual ones.

A. Overall Method of Manufacturing End Mill The method of manufacturing the end mill of the present invention comprises a base material having a base made of a superhard material and a sintered diamond layer provided on one surface of the base, and electric discharge machining or laser machining. Cutting out a cutting blade forming piece having a predetermined shape by: cutting the base of the cutting blade forming piece to reduce the thickness of the base to obtain a cutting blade; and attaching the cutting blade to the main body. . Hereinafter, each step will be described in order.

B. Base material First, the base material is prepared. 1A is a schematic sectional view illustrating an example of a base material of a cutting blade used in a manufacturing method according to an embodiment of the present invention, and FIG. 1B is a schematic view of the base material of FIG. 1A. It is a perspective view. As described above, the base material 10 has the base 12 made of a superhard material and the sintered diamond layer 14 provided on one surface of the base 12. The matrix 10 can have any suitable shape. For example, the base material 10 may have a disk shape (circular shape in plan view) as illustrated.

  A cemented carbide is typically used as the cemented carbide material forming the base 12. The cemented carbide is typically a composite material in which carbides of IVa, Va, and VIa group metals of the periodic table are sintered with an iron-based metal such as Fe, Co, or Ni. Specific examples of the cemented carbide include WC-Co alloys, WC-TiC-Co alloys, WC-TaC-Co alloys, WC-TiC-TaC-Co alloys, WC-Ni alloys and WC-Ni alloys. -Cr type alloy is mentioned. The sintered diamond constituting the sintered diamond layer 14 is typically a polycrystalline diamond obtained by baking small particles of diamond together with a binder (for example, metal powder or ceramic powder) at high temperature and high pressure. The characteristics of the sintered diamond can be adjusted by changing the type and blending ratio of the binder.

  The base material 10 has a thickness of, for example, 1.6 mm to 3.2 mm, preferably 1.6 mm to 2.4 mm. If the thickness of the base material is in such a range, it is possible to suppress the warp of the cutting blade forming piece when the cutting blade forming piece is cut out from the base material, and thus, the warp of the obtained cutting blade is suppressed. Can be suppressed. As a result, the cutting blade can be well attached to the end mill body.

  The thickness of the base 12 is, for example, 1.1 mm to 2.8 mm. If the thickness of the base portion is in such a range, similarly to the above, it is possible to suppress the warp of the cutting blade forming piece when the cutting blade forming piece is cut out from the base material, and thereby, the obtained cutting The warp of the blade can be suppressed. As a result, the cutting blade can be well attached to the end mill body. The thickness of the sintered diamond layer 14 is, for example, 0.2 mm to 2.8 mm, preferably 0.2 mm to 1.0 mm, and more preferably 0.3 mm to 0.8 mm.

  Base material 10 may be made by methods well known and conventional in the industry.

B. Cutting Out Cutting Blade Forming Piece Next, as shown in FIG. 2A, the cutting blade forming piece 20 is cut out from the base material 10. The cutting of the cutting blade forming piece is performed by electric discharge machining or laser machining. The electric discharge machining is not particularly limited, and for example, wire cut electric discharge machining or die-sinking electric discharge machining can be used. The wire-cut electric discharge machining is performed by melting and removing the base material by using a metal wire as an electrode and immersing the base material in a working liquid to generate an electric discharge phenomenon between the base material and the electrode. The die-sinking electric discharge machining is performed, for example, by bringing a graphite electrode or a copper electrode formed in a shape corresponding to a shape to be formed on the base material close to the base material. Laser processing is performed by cutting out a base material with a laser beam. As shown in FIG. 2B, the cut cutting blade forming piece 20 has a base portion 12 and a sintered diamond layer 14 similar to the base material. The thickness of the cutting blade forming piece, the thickness of the base portion, and the thickness of the sintered diamond layer are as described in the section A for the base material.

  The cutting blade forming piece 20 typically has a rectangular plan view shape, as shown in FIG. With such a shape, a cutting blade having a desired shape can be produced by cutting the base portion as described later. The length L of the cutting blade forming piece 20 may correspond to the length of the obtained cutting blade. By cutting the cutting blade forming piece from the base material as described above, the cutting blade forming piece (finally, the cutting blade) can be formed as a seamless one-piece along the length direction. As a result, it is possible to produce a cutting blade (finally, an end mill) which is extremely excellent in cutting ability, strength and durability. The length L of the cutting blade forming piece 20 is preferably 15 mm or more, and more preferably 20 mm to 50 mm. With such a length, when the optical film is cut using the obtained end mill, it is possible to cut a work in which a desired number of optical films are laminated, thus improving the cutting efficiency. be able to.

C. Making a cutting blade (cutting the base)
Next, as shown in FIG. 3, the cutting blade 30 is obtained by cutting the base portion 12 of the cutting blade forming piece 20 to reduce its thickness. That is, the thickness of the cutting blade 30 is smaller than the thickness of the base material 10 (the thickness of the cutting blade forming piece 20). Cutting can typically be done by polishing. The polishing is performed by polishing the surface of the base 12 with a flat polishing machine. However, the cutting is not limited to polishing and may be another method. For example, it may be milling, lathing, or wire cutting.

The obtained cutting blade 30 has a base 16 that has been cut (hereinafter, simply referred to as the base 16 or the base 16 of the cutting blade) and the sintered diamond layer 14. The thickness of the cutting blade 30 is, for example, 0.7 mm to 1.6 mm, preferably 0.75 mm to 1.2 mm. The thickness of the base 16 of the cutting blade 30 is, for example, 0.2 mm to 1.3 mm, preferably 0.4 mm to 0.9 mm. The thickness of the base portion 16 of the cutting blade 30 is smaller than the thickness of the base portion 12 of the base material 10 (the thickness of the base portion 12 of the cutting blade forming piece 20). The ratio _d 14 _{/ d 16} of the thickness of the sintered diamond layer 14 and the base 16 of the cutting blade 30 is preferably 70% to 400%, more preferably 100% to 300%. When the ratio d ₁₄ / d ₁₆ is in such a range, it is possible to obtain the advantage that the strength as a blade can be secured while suppressing the warpage during brazing.

D. Attaching the cutting blade to the main body (manufacturing the end mill)
Next, as shown in FIG. 4A or FIG. 4B, the obtained cutting blade 30 is attached to the end mill body 40. The main body 40 can be manufactured, for example, by processing a sintered body obtained by a powder metallurgy method known in the art into a predetermined shape (for example, a cylindrical shape) by a method known in the art.

  In one embodiment, as shown in FIG. 4A, the cutting blade 30 is attached to the main body 40 by pasting. In the present invention, since the warp of the cutting blade is suppressed, such attachment is possible. In the present embodiment, a mounting surface 42 is formed on the body 40. The mounting surface 42 may be formed on the body 40 by any suitable method (eg, cutting). The bonding is typically performed by brazing (for example, vacuum brazing or high frequency brazing).

  In another embodiment, as shown in FIG. 4B, the cutting blade 30 is embedded in the embedding portion 44 provided in the main body 40 (typically, the cutting blade 30 is inserted into the embedding portion 44). It is attached to the main body 40 by. In the present invention, since the bending of the cutting blade is suppressed, such embedding becomes possible. Further, with the configuration as shown in FIG. 4B, cutting ability, strength and durability can be improved. The embedded portion 44 can be formed by any suitable method. Specific examples of the forming method include laser processing and cutting processing. The depth of the embedding portion 44 is preferably 0.30 mm to 1.50 mm, more preferably 0.30 mm to 1.00 mm, and further preferably 0.30 mm to 0.70 mm. When the depth of the embedded portion is in such a range, both the strength of fixing the cutting blade to the main body and the strength of the main body itself can be secured. Preferably, the cutting blade 30 is fixed to the embedding portion 44 by vacuum brazing while being embedded in the embedding portion 44. With such a configuration, cutting ability, strength and durability can be further improved. The vacuum brazing can satisfactorily adhere to the main body (embedded portion) even with a cutting blade including a sintered diamond layer. This is because residual oxygen and moisture during brazing can be removed, and thus the oxide film on the body surface can be destroyed and the oxide film can be prevented from being regenerated, so that the wettability of the body surface can be increased.

  In the illustrated example, the embodiment in which the number of cutting blades is two has been described, but the number of cutting blades may be one, or may be three or more (for example, three or four). The number of cutting blades is preferably 2 to 3. With such a configuration, since the interval between the cutting blades is appropriately secured, cutting scraps can be satisfactorily discharged. More preferably, the number of cutting blades is two. With such a configuration, the rigidity of the cutting blade is ensured, and the pocket is secured, so that cutting scraps can be satisfactorily discharged.

  Further, in the illustrated example, the embodiment in which the cutting edge of the cutting edge is flat has been described, but the cutting edge may be sharp (for example, in FIGS. 4A and 4B, an apex of an acute angle in plan view). You may have). The cutting edge can be sharpened by any appropriate cutting process.

  The end mill can be manufactured as described above.

E. End Mill FIG. 5 (a) is a schematic plan view illustrating an example of an end mill obtained by the embodiment of FIG. 4 (b), and FIG. 5 (b) is a schematic perspective view of the end mill of FIG. 5 (a). . The end mill 100 of the illustrated example has a main body 40 that rotates about a rotary shaft 46 that extends in the vertical direction (the stacking direction of the works, the work is a cutting target in which optical films are stacked, details will be described later), and the main body 40. A cutting blade 30 protruding from the outermost diameter. The end mill is typically a straight end mill. In the illustrated example, the main body 40 is provided with an embedded portion 44, and the cutting blade 30 is embedded in the embedded portion 44 and fixed to the main body 40. With such a configuration, the cutting blade can be satisfactorily attached to the main body even if the end mill has a small diameter and it is difficult to sufficiently secure the attachment surface of the cutting blade on the main body surface. Therefore, a small-diameter end mill having a practically acceptable cutting ability can be actually manufactured. Furthermore, an end mill excellent in strength and durability can be realized. When a plurality of embedded portions are provided, the embedded portions are preferably provided at symmetrical positions with respect to the rotation axis 46. With such a configuration, good cutting can be realized and the strength and durability of the end mill can be further improved.

  In the end mill of the illustrated example, the helix angle of the cutting blade 30 is typically 0 °. With such a configuration, it is possible to satisfactorily cut the optical film described below. More specifically, when cutting with a cutting blade having a helix angle (for example, deformed machining or non-linear machining), the cutting surface may have a taper shape when viewed from the lateral direction, but the helix angle is 0 °. By using the cutting blade, it is possible to prevent the cutting surface from being tapered. Here, the irregular processing means processing the optical film into a shape other than a rectangle, for example. In particular, a remarkable effect can be obtained when fine non-linear processing (deformation) is performed on the optical film using a small-diameter end mill. In the present specification, “twist angle is 0 °” means that the cutting blade 30 extends in a direction substantially parallel to the rotary shaft 46, in other words, the blade is not twisted with respect to the rotary shaft. Say. It should be noted that “0 °” means substantially 0 °, and also includes a case where a slight angle twist is caused by a processing error or the like.

  The outer diameter of the end mill in the illustrated example is typically less than 10 mm, preferably 3 mm to 9 mm, and more preferably 4 mm to 7 mm. According to the embodiment of the present invention, it is possible to actually manufacture an end mill having such a small outer diameter and practically acceptable cutting ability. As a result, for example, in fine non-linear processing (deformed processing) of an optical film using such a small-diameter end mill, cracks and yellow bands of the optical film can be favorably suppressed, and further, the optical film has an adhesive layer. When it has, it is possible to satisfactorily suppress the lack of glue. In the present specification, the “outer diameter of the end mill” refers to a value obtained by doubling the distance from the rotary shaft 46 to the cutting edge 30a.

  Cutting blade 30 typically includes a cutting edge 30a, a rake surface 30b, and a relief surface 30c. The rake face 30b is located on the downstream side in the rotation direction R, and the pocket 50 can be defined by the rake face 30b and the main body 40. The relief surface 30c (base portion 16) in which the surface of the sintered diamond layer 14 corresponds to the rake surface 30b and the surface of the base portion 16 corresponds to the relief surface 30c is preferably roughened. Any appropriate treatment can be adopted as the surface-roughening treatment. A typical example is blasting. By subjecting the relief surface to a roughening treatment, when cutting the optical film, and when the optical film includes an adhesive layer (for example, an adhesive layer, a pressure-sensitive adhesive layer), an adhesive to a cutting blade or Adhesion of the pressure-sensitive adhesive can be suppressed, and as a result, blocking can be suppressed. In the present specification, "blocking" refers to a phenomenon in which the optical films in the work adhere to each other with an adhesive or a pressure-sensitive adhesive when the optical film includes an adhesive layer, and a scraping of the adhesive or the pressure-sensitive adhesive attached to the end surface. The dust will contribute to the adhesion between the optical films.

F. Method of Using End Mill The end mill obtained by the production method of the present invention can typically be suitably used in the production method of an optical film. The manufacturing method preferably includes cutting the end surface of the optical film.

  Specific examples of the optical film include a polarizer, a retardation film, a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch panel, a surface-treated film, and for these purposes. A laminate (for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel) appropriately laminated may be used. In one embodiment, the optical film includes an adhesive layer (eg, an adhesive layer, a pressure-sensitive adhesive layer). By using the end mill according to the embodiment of the present invention, it is possible to suppress glue cracking during cutting, even with an optical film including an adhesive layer.

  Hereinafter, a manufacturing method when a polarizing plate with a pressure-sensitive adhesive layer is used as an example of an optical film will be described. Specifically, each step in the method of manufacturing a planar polarizing plate with a pressure-sensitive adhesive layer as shown in FIG. 6 will be described. It is obvious to those skilled in the art that the optical film is not limited to the polarizing plate with the pressure-sensitive adhesive layer, and that the planar shape of the polarizing plate with the pressure-sensitive adhesive layer is not limited to the planar shape of FIG. 6. That is, the end mill obtained by the manufacturing method of the present invention can be applied to the manufacturing method of any optical film having any shape.

F-1. Formation of Workpiece FIG. 7 is a schematic perspective view for explaining the cutting process of the optical film, and the work piece 200 is shown in this figure. As shown in FIG. 7, a work 200 is formed by stacking a plurality of optical films (polarizing plates with adhesive layers). The pressure-sensitive adhesive layer-attached polarizing plate can be manufactured by a method well known and commonly used in the art, and thus a detailed description of the manufacturing method is omitted. The polarizing plate with the pressure-sensitive adhesive layer is typically cut into any appropriate shape when forming a work. Specifically, the pressure-sensitive adhesive layer-attached polarizing plate may be cut into a rectangular shape, may be cut into a shape similar to the rectangular shape, or may be cut into an appropriate shape (for example, a circle) according to the purpose. It may have been done. In the illustrated example, the pressure-sensitive adhesive layer-attached polarizing plate is cut into a rectangular shape, and the work 200 has outer peripheral surfaces (cutting surfaces) 200a and 200b facing each other and outer peripheral surfaces (cutting surfaces) 200c and 200d orthogonal thereto. Have The work 200 is preferably clamped from above and below by a clamp means (not shown). The total thickness of the work is preferably 10 mm to 50 mm, more preferably 15 mm to 25 mm, and further preferably about 20 mm. With such a thickness, it is possible to prevent damage due to the pressing by the clamp means or the impact during cutting. The polarizing plates with the pressure-sensitive adhesive layer are stacked so that the works have such a total thickness. The number of pressure-sensitive adhesive layer-attached polarizing plates constituting the work may be, for example, 20 to 100. The clamp means (eg, jig) may be made of a soft material or a hard material. When it is made of a soft material, its hardness (JIS A) is preferably 60 ° to 80 °. If the hardness is too high, the pressing trace by the clamp means may remain. If the hardness is too low, the jig may be deformed to cause positional deviation, resulting in insufficient cutting accuracy.

F-2. End Mill Processing Next, a predetermined position on the outer peripheral surface of the work 200 is cut by the end mill 100. The end mill 100 is typically held by a machine tool (not shown), is rotated at a high speed around the rotation axis of the end mill, and is fed in a direction intersecting with the rotation axis while the cutting blade is placed on the outer peripheral surface of the workpiece 200. Used by abutting and cutting. That is, the cutting is typically performed by bringing the cutting blade of the end mill into contact with the outer peripheral surface of the work 200 to make a cut. In the case of producing a pressure-sensitive adhesive layer-attached polarizing plate having a shape in plan view as shown in FIG. 6, chamfered portions 200E, 200F, 200G, and 200H are formed at four corners of the outer periphery of the work 200, and chamfered portions 200E and A recess 200I is formed at the center of the outer peripheral surface connecting with 200H.

  The cutting process of the work 200 will be described in detail. First, as shown in FIG. 8A, the portion where the chamfered portion 200E of FIG. 6 is formed is chamfered, and then, as shown in FIGS. 8B to 8D, the chamfered portion 200F, The portions where 200G and 200H are formed are sequentially chamfered. Finally, as shown in FIG. 8E, the recess 200I is cut and formed. In the illustrated example, the chamfered portions 200E, 200F, 200G and 200H, and the recess 200I are formed in this order, but they may be formed in any appropriate order.

  The cutting conditions can be appropriately set according to the configuration of the polarizing plate with the pressure-sensitive adhesive layer, the desired shape, and the like. For example, the rotation speed (rotation speed) of the end mill is preferably less than 25000 rpm, more preferably 22000 rpm or less, and further preferably 20000 rpm or less. The lower limit of the rotation speed of the end mill can be, for example, 10,000 rpm. Further, for example, the feed speed of the end mill is preferably 500 mm / min to 10000 mm / min, more preferably 500 mm / min to 2500 mm / min, and further preferably 800 mm / min to 1500 mm / min. Further, for example, the cut amount of the end mill is preferably 0.8 mm or less, more preferably 0.3 mm or less. The number of cuts at the cutting location by the end mill may be one cut, two cuts, three cuts or more.

  As described above, by using the end mill obtained by the production method of the present invention, a polarizing plate with a pressure-sensitive adhesive layer that has been cut can be obtained. In the illustrated example, a polarizing plate with a pressure-sensitive adhesive layer including a non-linearly processed portion can be obtained.

  The end mill obtained by the production method of the present invention can be suitably used for cutting an optical film. The optical film machined by the end mill of the present invention can be used for, for example, an instrument panel of a car or a deformed image display section represented by a smart watch.

10 Base Material 12 Base of Cutting Blade Forming Piece 14 Sintered Diamond Layer 16 Base of Cutting Blade 20 Cutting Blade Forming Piece 30 Cutting Blade 30a Cutting Edge 30b Rake Face 30c Relief Surface 40 Main Body 42 Mounting Surface 44 Embedded Section 46 Rotating Shaft 50 Pocket 100 End mill 200 work

Claims (7)

Cutting a cutting blade forming piece having a predetermined shape by electric discharge machining or laser machining from a base material having a base made of a superhard material and a sintered diamond layer provided on one surface of the base.
Cutting the base of the cutting blade forming piece to reduce the thickness of the base to obtain a cutting blade; and
Attaching the cutting blade to the body;
And a method for manufacturing an end mill.   The method for manufacturing an end mill according to claim 1, wherein the cutting blade forming piece has a thickness of 1.6 mm to 3.2 mm, and the cutting blade has a thickness of 0.7 mm to 1.6 mm.   The method for manufacturing an end mill according to claim 1 or 2, wherein the base of the cutting blade forming piece has a thickness of 1.1 mm to 2.8 mm, and the base of the cutting blade has a thickness of 0.2 mm to 1.3 mm. .   The method for manufacturing an end mill according to claim 1, wherein the cutting blade is attached to the main body by pasting.   The method for manufacturing an end mill according to claim 1, wherein the cutting blade is attached to the main body by being embedded in an embedded portion provided in the main body.   The method for manufacturing an end mill according to claim 5, wherein the cutting blade is fixed to the embedded portion by vacuum brazing while the cutting blade is embedded in the embedded portion.   The method for manufacturing an end mill according to claim 1, wherein cutting the base of the cutting blade forming piece includes polishing.

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