TWI794542B - Manufacturing method of end mill - Google Patents

Abstract

Provided is a method of manufacturing an end mill capable of suppressing warping of a cutting blade and enabling the cutting blade to be satisfactorily attached to a main body. The manufacturing method of the end mill of the present invention comprises the following steps: by electric discharge machining or laser machining, from the base material which has a base made of superhard material and a sintered diamond layer arranged on one side of the base, a predetermined The shape of the cutting edge forming sheet; cutting the base of the cutting edge forming sheet to reduce the thickness of the base to obtain the cutting edge; and attaching the cutting edge to the main body.

Description

Manufacturing method of end mill

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

Background of the invention End mills are widely known as one type of cutting tools. Typically, an end mill has a main body that rotates about a rotation axis, and a cutting blade attached to the surface of the main body. Prior art literature

patent documents Patent Document 1: Japanese Patent Laid-Open No. 2016-182658

Summary of the invention The problem to be solved by the invention It has been reviewed to use a cutting blade having a base made of a superhard material and a sintered diamond layer on one side of the base as a cutting blade of an end mill. Regarding such a cutting edge, when it is cut out from the base material and attached to the end mill body, the following situation may occur: the cutting edge warps when cutting out, and it is difficult to attach the cutting edge to the end mill due to the warping. main body.

The present invention was made to solve the above-mentioned conventional problems, and its main purpose is to provide a method of manufacturing an end mill that suppresses warping of the cutting blade and enables the cutting blade to be mounted favorably on the main body. means to solve problems

The inventors of the present invention have found that due to the laminated structure, the heat shrinkage of the superhard material on the base side and the sintered diamond layer side is different, and warping occurs due to the heat generated when cutting out the base material. Furthermore, it was found that by cutting out a base material in which the base made of a superhard material is thicker than usual, and then cutting the base, it is possible to manufacture a cutting blade that suppresses the warpage of the cutting blade that occurs during cutting, and Complete the present invention. The manufacturing method of the end mill of the present invention comprises the following steps: by electric discharge machining or laser machining, from the base material having the base made of superhard material and the sintered diamond layer provided on one side of the base, cutting out A cutting blade forming sheet of a predetermined shape; cutting a base of the cutting blade forming sheet to reduce the thickness of the base to obtain a cutting blade; and attaching the cutting blade to a main body. In one embodiment, the thickness of the cutting blade forming sheet is 1.6 mm to 3.2 mm, and the thickness of the cutting blade is 0.7 mm to 1.6 mm. In one embodiment, the thickness of the base of the cutting blade forming sheet is 1.1 mm to 2.8 mm, and the thickness of the base of the cutting blade is 0.2 mm to 1.3 mm. In one embodiment, the above-mentioned manufacturing method is to attach the above-mentioned cutting blade to the above-mentioned main body by sticking. In another embodiment, the above-mentioned manufacturing method is such that the above-mentioned cutting blade is attached to the main body by being embedded in an embedding portion provided on the above-mentioned main body. Furthermore, in such a manufacturing method, the cutting blade is fixed to the embedded portion by vacuum brazing in a state where the cutting blade is embedded in the embedded portion. In one embodiment, the cutting of the base of the cutting edge forming sheet includes grinding. Invention effect

According to the present invention, in the method of manufacturing an end mill having a cutting blade having a base and a sintered diamond layer attached to a main body, a cutting blade forming sheet is cut out from a base material having a thick base, and the cutting blade is formed. Cutting the base of the sheet to reduce the thickness of the base to obtain a cutting edge, whereby the warping of the cutting edge is suppressed, and the manufacturing method of the end mill that can attach the cutting edge to the main body satisfactorily can be realized . As a result, an end mill excellent in cutting ability, strength and durability can be manufactured. According to the present invention, although the material cost increases because the thick base is cut thinner, if the installation of the cutting blade to the main body and the resulting strength and durability are taken into consideration, the overall manufacturing efficiency is excellent. That is, the present invention solves the problem by means that would never be adopted according to the technical common sense in the industry.

form for carrying out the invention Although specific embodiments of the present invention will be described below with reference to the drawings, the present invention is not limited to these embodiments. In addition, the drawings are schematically shown for easy viewing, and ratios of length, width, thickness, etc., angles, etc. in the drawings are different from actual ones.

A. Overall manufacturing method of end mill The manufacturing method of the end mill of the present invention includes the following steps: by electric discharge machining or laser machining, cutting from a base material having a base made of a superhard material and a sintered diamond layer arranged on one side of the base forming a cutting blade forming sheet of a predetermined shape; cutting the base of the cutting blade forming sheet 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, prepare the base material. Fig. 1 (a) 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. 1 (b) is a schematic perspective view of the base material of Fig. 1 (a). As mentioned above, the base material 10 has a base 12 made of a superhard material, and a sintered diamond layer 14 provided on one side of the base 12 . The base material 10 may have any suitable shape. For example, the base material 10 may be disc-shaped (circular in plan view) as shown in the figure.

The superhard material constituting the base 12 may be representatively a superhard alloy. Cemented carbide typically refers to a composite material obtained by sintering carbides of group IVa, Va, and VIa metals of the periodic table with iron-based metals such as Fe, Co, and Ni. Concrete examples of superhard alloys include WC-Co alloys, WC-TiC-Co alloys, WC-TaC-Co alloys, WC-TiC-TaC-Co alloys, WC-Ni alloys, WC- Ni-Cr alloy. The sintered diamond constituting the sintered diamond layer 14 is typically a polycrystalline diamond in which small diamonds are sintered together with a binder (such as metal powder, ceramic powder) at high temperature/high pressure. The characteristics of sintered diamonds can be adjusted by changing the type and mixing ratio of the binder.

The thickness of the base material 10 is, 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 within such a range, warping of the cutting blade forming sheet can be suppressed when the cutting blade forming sheet is cut out from the base material, thereby suppressing warping of the resulting cutting blade. As a result, the cutting blade can be satisfactorily attached to the end mill body.

The thickness of the base portion 12 is, for example, 1.1 mm to 2.8 mm. If the thickness of the base is within such a range, then, similar to the above, when the cutting blade forming sheet is cut out from the base material, the warping of the cutting blade forming sheet can be suppressed, whereby the obtained cutting blade can be suppressed. Warped. As a result, the cutting blade can be satisfactorily 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, more preferably 0.3 mm to 0.8 mm.

The base material 10 can be produced by well-known and commonly used methods in the industry.

B. Cutting out of cutting blade forming sheet Next, as shown in FIG. 2( a ), the cutting edge forming piece 20 is cut out from the base material 10 . Cutting out of the cutting edge forming sheet is performed by electric discharge machining or laser machining. The electrical discharge machining is not particularly limited, and for example, secant electrical discharge machining and engraving electrical discharge machining can be used. Secant electrical discharge machining is carried out, for example, by using a metal secant as an electrode, immersing the base material in a machining fluid, and generating an electric discharge between the base material and the electrode, thereby melting and removing the base material. Sculpture electrical discharge machining is performed, for example, by bringing a black lead (graphite) electrode or a copper electrode, etc., which are formed into a shape corresponding to the shape to be formed on the base material, close to the base material. Laser processing is carried out by cutting the base material with laser light. The cut-out cutting edge forming sheet 20 has the same base portion 12 and sintered diamond layer 14 as the base material, as shown in FIG. 2( b ). The thickness of the cut-off blade forming sheet, the thickness of the base and the thickness of the sintered diamond layer are as described in relation to the base material in the above item A.

Typically, the cutting edge forming piece 20 has a rectangular planar shape as shown in FIG. 2( b ). By having such a shape, a cutting blade of a desired shape can be produced by cutting the base portion as described later. The length L of the cutting edge forming sheet 20 may correspond to the length of the cutting edge to be obtained. By cutting out the cutting edge forming sheet from the base material as described above, the cutting edge forming sheet (ultimately, the cutting edge) can be made into an integral body without seams along the longitudinal direction. As a result, a cutting blade (ultimately an end mill) excellent in cutting ability, strength, and durability can be produced. The length L of the cutting edge forming piece 20 is preferably more than 15 mm, more preferably 20 mm to 50 mm. If such a length is used, when the obtained end mill is used to cut the optical film, it is possible to cut the workpiece with the desired number of optical films laminated, so the efficiency of the cutting process can be improved.

C. Production of the cutting blade (cutting of the base) Next, as shown in FIG. 3 , the base portion 12 of the cutting edge forming sheet 20 is cut to reduce its thickness, whereby the cutting edge 30 is obtained. That is, the thickness of the cutting edge 30 is smaller than the thickness of the base material 10 (the thickness of the cutting edge forming sheet 20 ). Cutting can typically be performed by grinding. Grinding is performed by grinding the surface of the base 12 with a flat grinder. However, cutting is not limited to grinding, and other methods are also possible. For example, milling, lathe, or secant machining may be used.

The resulting cutting blade 30 has a cut base 16 (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 portion 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 sheet 20 ). The thickness ratio d ₁₄ /d ₁₆ of the sintered diamond layer 14 and the base 16 of the cutting edge 30 is preferably 70%-400%, more preferably 100%-300%. If the ratio d ₁₄ /d ₁₆ is within such a range, it is possible to obtain an advantage that the strength as a blade can be ensured while suppressing warping during brazing.

D. Install the cutting edge to the main body (production of end mill) Next, as shown in FIG. 4( a ) or FIG. 4( b ), the obtained cutting blade 30 is attached to the end mill body 40 . The main body 40 can be produced by, for example, processing a sintered body obtained by a well-known powder metallurgy method into a predetermined shape (eg, a cylindrical shape) by a well-known method in the industry.

As shown in FIG. 4( a ), in one embodiment, the cutting blade 30 is attached to the main body 40 by sticking. In the present invention, such attachment is possible because the warpage of the cutting blade is suppressed. In this embodiment, a mounting surface 42 is formed on the main body 40 . The mounting surface 42 can be formed on the main body 40 by any appropriate method (such as cutting). Attachment is typically performed by brazing such as vacuum brazing or high frequency brazing.

As shown in Fig. 4(b), in another embodiment, the cutting blade 30 is embedded in the embedding portion 44 provided on the main body 40 (representatively, the cutting blade 30 is inserted into the embedding portion 44) And installed on the main body 40 . In the present invention, such embedding is possible because warpage of the cutting blade is suppressed. Furthermore, if it is constituted as shown in Fig. 4(b), the cutting ability, strength and durability may be improved. The embedded portion 44 may be formed by any appropriate method. Specific examples of the forming method include laser processing and dicing processing. The depth of the embedded portion 44 is preferably 0.30 mm to 1.50 mm, more preferably 0.30 mm to 1.00 mm, more preferably 0.30 mm to 0.70 mm. If the depth of the embedded portion is within such a range, both the fixing strength of the cutting blade to the main body and the strength of the main body itself can be ensured. Preferably, the cutting blade 30 is fixed to the embedded portion 44 by vacuum brazing in a state where the cutting blade 30 is embedded in the embedded portion 44 . With such a configuration, the cutting ability, strength and durability may be further improved. Even for cutting blades that include a sintered diamond layer, vacuum brazing secures them well to the main body (embedded portion). This is because, since the residual oxygen and moisture during brazing can be removed, the oxide film on the surface of the main body can be destroyed and regeneration of the oxide film can be prevented, so the wettability of the surface of the main body can be increased.

Although the embodiment described in the illustrated example is to make the number of cutting blades be 2 pieces, the number of cutting blades can also be 1 piece, and also can be more than 3 pieces (for example, 3 pieces, 4 pieces). The number of cutting blades should be 2 to 3 pieces. According to such a structure, since the space|interval between cutting blades can be ensured suitably, cutting chips can be discharged|emitted favorably. Preferably, the number of cutting blades is two. According to such a structure, the rigidity of a cutting blade can be ensured, and a chip pocket can be ensured, and cutting chips can be discharged|emitted favorably.

Again, although the embodiment described in the illustrated example is to make the tip of the cutting blade flat, the tip of the blade can also be sharp (for example, it can also be seen in Fig. 4 (a) and Fig. 4 (b). apex of the lower acute angle). The tip of the blade can be sharpened by any appropriate cutting process.

An end mill can be manufactured by the above content.

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 in Fig. 5(a). The end mill 100 of the illustrated example has a main body 40 that rotates around a rotating shaft 46 extending in the vertical direction (the lamination direction of the workpiece, the workpiece is an object to be cut on which an optical film is laminated, details will be described later), and The main body 40 protrudes to form the outermost diameter of the cutting blade 30 . As for the end mill, it is typically a straight shank end mill. In the illustrated example, the main body 40 is provided with an embedding portion 44 , and the cutting blade 30 is embedded in the embedding portion 44 to be fixed to the main body 40 . With such a configuration, even if the end mill has a small diameter and it is difficult to secure a sufficient mounting surface for the cutting blade on the surface of the main body, the cutting blade can be satisfactorily attached to the main body. Therefore, a small-diameter end mill having a practically acceptable cutting ability can be actually manufactured. Furthermore, an end mill with excellent strength and durability can be realized. When a plurality of embedded parts are provided, the embedded parts are preferably provided at symmetrical positions with respect to the rotation axis 46 . With such a configuration, it is possible not only to achieve good cutting but also to improve the strength and durability of the end mill.

Regarding the end mill of the illustrated example, the helix angle of the cutting edge 30 is representatively 0°. According to such a structure, the dicing of the optical film mentioned later can be performed favorably. More specifically, in the case of cutting with a cutting blade with a helix angle (for example, special-shaped processing or non-linear processing), sometimes the cutting surface becomes tapered when viewed from the horizontal direction. Therefore, by using the helix angle The 0° cutting edge can prevent the cutting surface from becoming tapered. Here, "deformation processing" means, for example, processing an optical film into a shape other than a rectangle. In particular, a remarkable effect can be obtained when using a small-diameter end mill to perform fine non-linear processing (deformation processing) on an optical film. In addition, in this specification, "the helix angle is 0°" means that the cutting blade 30 extends in a direction substantially parallel to the rotation axis 46 , in other words, the blade does not spiral with respect to the rotation axis. In addition, "0°" means substantially 0°, and the case where there is a slight angle twist due to processing errors and the like is also included.

The outer diameter of the end mill shown in the illustration is typically less than 10mm, preferably 3mm~9mm, more preferably 4mm~7mm. According to the embodiment of the present invention, it is possible to actually manufacture an end mill having such a small outer diameter and having a practically acceptable cutting capability. As a result, for example, in the fine non-linear processing (deformation processing) of an optical film using such a small-diameter end mill, the cracking and yellowing of the optical film can be well suppressed, and when the optical film has an adhesive In the case of a single layer, it is possible to well suppress the lack of glue at the end due to processing. In addition, in this description, "end mill outer diameter" means twice the distance from the rotating shaft 46 to the cutting edge 30a.

The cutting edge 30 typically includes a cutting edge 30a, a slope 30b, and a clearance surface 30c. The slope 30 b is located on the downstream side of the rotation direction R, and the chip cavity 50 can be defined by the slope 30 b and the main body 40 . The surface of the sintered diamond layer 14 corresponds to the slope 30b, the surface of the base 16 corresponds to the gap surface 30c, and the gap surface 30c (base 16) should be roughened. Any appropriate treatment may be used for the roughening treatment. Sandblasting can be given as a representative example. By applying roughening treatment to the gap surface, even if the optical film contains an adhesive layer (such as an adhesive layer, adhesive layer) when the optical film is cut, it is possible to prevent the adhesive or adhesive from adhering to the cutting edge , As a result, blocking can be suppressed. In this specification, "adhesion" refers to the phenomenon that when the optical film contains an adhesive layer, the optical film of the workpiece is bonded to each other with the adhesive or adhesive on the end surface, and the adhesive or adhesive on the end surface is shavings Facilitates the adhesion of optical films to each other.

F. How to use the end mill The end mill obtained by the production method of the present invention is typically suitable for use in a production method of an optical film. The manufacturing method preferably includes cutting the end face of the optical film.

Specific examples of optical films include polarizers, retardation films, polarizing plates (typically, laminates of polarizers and protective films), conductive films for touch panels, surface treatment films, and, depending on the purpose And laminated products (such as circular polarizing plates for anti-reflection, polarizing plates with conductive layers for touch panels) that are properly laminated. In one embodiment, the optical film contains an adhesive layer (for example, an adhesive layer, an adhesive layer). By using the end mill according to the embodiment of the present invention, even in an optical film including an adhesive layer, it is possible to suppress lack of adhesive due to dicing.

Hereinafter, the manufacturing method in the case of using the polarizing plate with an adhesive layer as an example of an optical film is demonstrated. Specifically, each step of a method of manufacturing a polarizing plate with an adhesive layer attached in a planar shape as shown in FIG. 6 will be described. In addition, it is obvious to the industry that the optical film is not limited to the polarizing plate with the adhesive layer, and the planar shape of the polarizing plate with the 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 of any shape.

F-1. Formation of workpiece FIG. 7 is a schematic perspective view for explaining the dicing process of an optical film, and a workpiece 200 is shown in this figure. As shown in FIG. 7 , a workpiece 200 in which a plurality of optical films (polarizing plates with adhesive layers) are stacked is formed. Since the polarizing plate with the adhesive layer can be manufactured by a well-known method in the industry, the detailed description of the manufacturing method is omitted. Typically, the polarizing plate with the adhesive layer is cut into any appropriate shape when the workpiece is formed. Specifically, the polarizing plate with the adhesive layer can be cut into a rectangular shape, can also be cut into a shape similar to a rectangular shape, or can be cut into a suitable shape corresponding to the purpose (such as a circular shape). ). In the illustrated example, the polarizing plate with the adhesive layer has been cut into a rectangular shape, and the workpiece 200 has outer peripheral surfaces (cutting surfaces) 200a, 200b facing each other, and outer peripheral surfaces (cutting surfaces) orthogonal to these 200c, 200d. The workpiece 200 is preferably clamped from top to bottom by a clamping means (not shown). The total thickness of the workpiece is preferably 10 mm to 50 mm, more preferably 15 mm to 25 mm, more preferably about 20 mm. Such a thickness can prevent damage caused by the compression of the clamping means or the impact during cutting. The polarizing plates with the adhesive layer are overlapped in such a way that the workpiece has such a total thickness. The number of polarizers constituting the adhesive layer of the workpiece may be, for example, 20 to 100. The clamping means (eg jig) can be made of soft material or hard material. When it is made of soft material, its hardness (JIS A) is preferably 60°~80°. If the hardness is too high, the indentation caused by the clamping means may remain. If the hardness is too low, the position may be shifted due to the deformation of the jig, and the cutting accuracy will become insufficient.

F-2. End Mill Processing Next, a predetermined position on the outer peripheral surface of the workpiece 200 is cut by the end mill 100 . The end mill 100 is typically used as follows: it is held by a machine tool (not shown), rotates at high speed around the rotation axis of the end mill, feeds in a direction intersecting the rotation axis, and moves the cutting edge It abuts against the outer peripheral surface of the workpiece 200 and cuts in. That is, cutting is typically performed by bringing the cutting edge of the end mill into contact with the outer peripheral surface of the workpiece 200 . When making a polarizing plate with an adhesive layer in a top view as shown in FIG. A concave portion 200I is formed in the central portion of the outer peripheral surface of 200H.

The cutting process of the workpiece 200 will be described in detail. First, as shown in FIG. 8(a), chamfering is performed at the part where the chamfered portion 200E of FIG. 6 is to be formed, and then, as shown in FIGS. Parts 200F, 200G, and 200H are sequentially chamfered. Finally, as shown in FIG. 8( e ), the concave portion 200I is formed by cutting. In addition, although the chamfered part 200E, 200F, 200G, 200H, and the recessed part 200I are formed in this order in the example shown in the figure, they should just be formed in arbitrary appropriate order.

The conditions of the cutting process can be appropriately set in accordance with the configuration, desired shape, and the like of the polarizing plate with the adhesive layer attached. For example, the rotational speed (number of rotations) of the end mill is preferably less than 25000 rpm, more preferably less than 22000 rpm, and still more preferably less than 20000 rpm. The lower limit of the rotation speed of the end mill may be, for example, 10000 rpm. Also, for example, the feed rate of the end mill should be 500 mm/min to 10000 mm/min, more preferably 500 mm/min to 2500 mm/min, more preferably 800 mm/min to 1500 mm/min. Also, for example, the cutting amount of the end mill is preferably 0.8 mm or less, more preferably 0.3 mm or less. The number of cuts performed on the cut portion by the end mill can be 1 time, 2 times, 3 times or more.

As above, using the end mill obtained by the manufacturing method of this invention, the polarizing plate with the adhesive layer which was cut and processed was obtained. In the example shown in the figure, a polarizing plate having an adhesive layer attached to a portion subjected to non-linear processing was obtained. Industrial availability

The end mill obtained by the manufacturing method of the present invention is suitable for cutting optical films. The optical film cut and processed by the end mill of the present invention can be used in a special-shaped image display part represented by, for example, an instrument panel of a car and a smart watch.

10: Base material 12: The cutting edge forms the base of the sheet 14: Sintered diamond layer 16: The base of the cutting blade 20: Cutting edge forming sheet 30: cutting blade 30a: blade tip 30b: inclined plane 30c: Clearance surface 40: subject 42: Mounting surface 44:Buried part 46:Rotary axis 50: chip hole 100: end mill 200: workpiece 200a, 200b, 200c, 200d: outer peripheral surface 200E, 200F, 200G, 200H: chamfering 200I: concave part d1, d2: thickness L: Length R: direction of rotation

Fig. 1 (a) 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. 1 (b) is a schematic perspective view of the base material of Fig. 1 (a). Fig. 2(a) is a schematic plan view illustrating the cutting edge forming sheet cut out from the base material in the manufacturing method of the embodiment of the present invention, and Fig. 2(b) is the cutting edge forming sheet cut out in Fig. 1(a) A schematic perspective view of . Fig. 3 is a schematic cross-sectional view illustrating the production of a cutting blade in the production method according to the embodiment of the present invention. Fig. 4(a) is a schematic plan view illustrating an example of attaching a cutting blade to a main body in the manufacturing method of the embodiment of the present invention, and Fig. 4(b) is a schematic plan view illustrating another example. 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 in Fig. 5(a). Fig. 6 is a schematic plan view showing an example of the shape of a non-linearly processed optical film obtainable by a method of manufacturing an optical film using an end mill obtained by the manufacturing method of the present invention end mill. Fig. 7 is a schematic perspective view for explaining cutting of an optical film using an end mill obtained by the manufacturing method of the present invention. 8(a) to 8(e) are schematic plan views illustrating an example of the cutting process of an optical film using an end mill, that is, a series of non-linear cutting processes. The above-mentioned end mill is obtained by the present invention. End mills obtained by manufacturing methods.

10: Base material

12: The cutting edge forms the base of the sheet

14: Sintered diamond layer

Claims (7)

A method for manufacturing an end mill, comprising the following steps: cutting out a predetermined cutting out of a base material having a base made of a superhard material and a sintered diamond layer provided on one side of the base by electrical discharge machining or laser machining. A shaped cutting blade forming sheet; cutting a base of the cutting blade forming sheet to reduce the thickness of the base to obtain a cutting blade; and attaching the cutting blade to a main body. The method of manufacturing an end mill as claimed in claim 1, wherein the thickness of the cutting blade forming sheet is 1.6 mm to 3.2 mm, and the thickness of the cutting blade is 0.7 mm to 1.6 mm. The method of manufacturing an end mill according to claim 1 or 2, wherein the thickness of the base of the cutting blade forming sheet is 1.1 mm to 2.8 mm, and the thickness of the base of the cutting blade is 0.2 mm to 1.3 mm. The method of manufacturing an end mill according to claim 1 or 2, wherein the cutting blade is attached to the main body by sticking. The method of manufacturing an end mill according to claim 1 or 2, wherein the cutting edge is attached to the main body by being embedded in an embedding portion provided in the main body. The method of manufacturing an end mill according to claim 5, wherein the cutting blade is fixed to the embedded portion by vacuum brazing in a state where the cutting blade is embedded in the embedded portion. The method of manufacturing an end mill according to claim 1 or 2, wherein the cutting of the base of the cutting edge forming sheet includes grinding.

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