JP2010029947A - Compound end mill and processing method using compound end mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compound end mill capable of performing both rough processing and finish processing without changing a tool in a rough processing step and a finish processing step, and a processing method using the compound end mill. <P>SOLUTION: This compound end mill TN has an approximate columnar shape, and is provided with a side blade Ts on a side face, and an approximate spherical finishing blade Tt on a bottom face which is a tip. Then, a spherical radius of the finishing blade Tt is larger than a radius of the bottom face provided with the finishing blade Tt. Also, at a boundary between the side face and the bottom face, a corner of the side blade Ts adjacent to the finishing blade Tt is formed like an arc being a contour with a radius smaller than the spherical radius of the finishing blade Tt. Also, the profile of the finishing blade Tt and the profile of the side blade Ts are made to smoothly communicate with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a composite end mill that is a tool for processing a thin plate-shaped workpiece, which is a blade having a three-dimensional curved surface, used for an aircraft engine, a generator turbine, and the like, and a processing method using the composite end mill.

Conventionally, for example, a thin plate-shaped workpiece W, which is a blade used in an aircraft engine, a generator turbine, or the like, has a three-dimensional curved surface. As shown in FIGS. 5 axes (X-axis, Y-axis, Z-axis, A-axis, B-axis in FIGS. 1A and 1B) are controlled with one end or both ends supported, and the tool T It is processed using.
In general, a ball end mill is used as the tool T, which is processed in two steps, a roughing process and a finishing process. In the roughing process, the entire thin plate-shaped workpiece W is processed to near the exact size with a roughing tool. (The remaining allowance is about 0.1 mm to 0.5 mm), and in the finishing process, the whole is finished after being replaced with a finishing tool.
Here, in the prior art described in Patent Document 1, the tip of the end mill is hemispherical, and abrasive grains are adhered to the hemispherical outer peripheral surface to process a composite material honeycomb such as GFRP (glass fiber reinforced plastic). GFRP honeycomb processing ball end mill, which is applicable to GFRP and is less likely to cause GFRP and adhesive peeling or destruction.
Japanese Utility Model Publication No. 63-193613

In the conventional general machining method, when the finishing process is performed after the roughing process, it is necessary to change the tool from the roughing tool to the finishing tool. Efficiency is reduced.
In addition, the conventional ball end mill for GFRP honeycomb processing described in Patent Document 1 has a small cutting amount because the cutting edge is abrasive and is suitable for finishing, but not suitable for roughing. Presumed. Therefore, as in the conventional general processing method, when performing the finishing process, it is necessary to change the tool from the roughing tool to the GFRP honeycomb processing ball end mill. Processing efficiency decreases.
The present invention was devised in view of such points, and it is not necessary to exchange tools between the roughing process and the finishing process, and a composite end mill capable of performing roughing and finishing, and It is an object to provide a processing method using a composite end mill.

As means for solving the above-mentioned problems, the first invention of the present invention is a composite end mill as described in claim 1.
The composite end mill according to claim 1 has a substantially cylindrical shape, a side blade is provided on a side surface portion, and a substantially spherical finishing blade is provided on a bottom surface portion which is a tip portion. .
And the spherical radius of the said finishing blade is larger than the radius of the said bottom face part in which the said finishing blade is provided.

The second invention of the present invention is a composite end mill as set forth in claim 2.
The composite end mill according to claim 2 is the composite end mill according to claim 1, wherein a corner portion adjacent to the finishing blade in the side surface blade at the boundary portion between the side surface portion and the bottom surface portion is It is formed in an arc shape having a contour with a radius smaller than the spherical radius of the finishing blade.

The third invention of the present invention is a composite end mill as set forth in claim 3.
The composite end mill according to claim 3 is the composite end mill according to claim 1 or 2, wherein when viewed from a direction orthogonal to the side surface portion, the contour of the finishing blade and the contour of the side blade are smooth. It is continuous.

The fourth invention of the present invention is a composite end mill as described in claim 4.
The composite end mill according to claim 4 is the composite end mill according to any one of claims 1 to 3, wherein the composite end mill penetrates through the inside of the composite end mill along the rotation axis of the composite end mill to the tip portion. A coolant supply path for supplying the coolant is provided.

The fifth aspect of the present invention is a composite end mill as set forth in the fifth aspect.
The composite end mill according to claim 5 is the composite end mill according to any one of claims 1 to 4, wherein the rotary shaft of the composite end mill with respect to the workpiece during finishing processing in which the finishing blade is brought into contact with the workpiece. When the inclination angle is set, the length in the radial direction of the bottom surface portion on the surface of the finishing blade is set so that the side blade does not contact the finishing surface of the workpiece.

A sixth aspect of the present invention is a composite end mill as set forth in the sixth aspect.
A composite end mill according to a sixth aspect is the composite end mill according to any one of the first to fifth aspects, wherein the finishing blade is a grindstone.

The seventh invention of the present invention is a processing method using a composite end mill as described in claim 7.
The processing method using the composite end mill according to claim 7 is a processing method using the composite end mill that cuts the workpiece surface using the composite end mill according to any one of claims 1 to 6.
When roughing an arbitrary surface of the workpiece, the tilt angle of the rotary shaft of the composite end mill is increased with respect to the processing surface so that the side edge of the composite end mill contacts the processing surface. On the other hand, the composite end mill is relatively moved along the processing surface for processing.
Then, when finishing an arbitrary surface of the workpiece, with respect to the processing surface so that the finishing blade of the composite end mill is in contact with the processing surface and the side blade is not in contact with the processing surface. This is a processing method using a composite end mill that performs processing by reducing the tilt angle of the rotating shaft of the composite end mill and moving the composite end mill relative to the workpiece along the processing surface.

According to the composite end mill according to claim 1, the cylindrical side surface is provided with a cutting edge for roughing (side edge), and the cylindrical bottom is provided with a cutting edge for finishing (finishing blade). A composite end mill can be realized.
This makes it possible to perform roughing and finishing separately depending on the position (blade to be used) where the composite end mill is used, and there is no need to change tools between the roughing process and the finishing process. A composite end mill capable of performing both finishing and finishing can be realized.

Moreover, according to the composite end mill of claim 2, the contour of the corner portion of the side blade adjacent to the finishing blade at the boundary portion between the cylindrical side surface portion and the bottom surface portion is more than the spherical radius of the finishing blade. Form a circular arc with a small radius.
Owing to the shape of the corner portion, it is possible to suppress the occurrence of chipping at the corner portion (cutout of the cutting edge).

  Moreover, according to the composite end mill of the third aspect, a smoother machined surface can be obtained even when machining is performed at the boundary between the side blade and the finishing blade, for example.

  Further, according to the composite end mill of the fourth aspect, the coolant can be appropriately supplied to the processing portion, and the coolant supply path can be realized with a relatively simple structure.

  According to the composite end mill of the fifth aspect, the diameter of the substantially spherical finishing blade can be set to an appropriate size.

  Moreover, according to the composite end mill of the sixth aspect, the finishing blade can be easily realized.

  Moreover, according to the processing method using the composite end mill according to claim 7, there is no need to change tools between the roughing process and the finishing process, and the composite end mill capable of performing roughing and finishing is provided. And can be processed more efficiently.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1A and 1B are schematic external views (perspective views) in an embodiment of a processing apparatus 1 in which a processing method using a composite end mill of the present invention is applied to processing of a thin plate workpiece W. ing. Note that in the drawings described in this embodiment, the Y axis indicates a vertically upward direction, and the X axis and the Z axis are orthogonal to each other in the horizontal direction. The A axis is a horizontal turning axis, and the B axis is a vertical turning axis. The tool T is a ball end mill, and the Z-axis direction is a rotation axis.

● [Schematic structure of the processing apparatus 1 (FIGS. 1A and 1B)]
A processing apparatus 1 shown in FIG. 1A is a processing apparatus that supports one end portion along the rotation axis of a thin plate-shaped workpiece W (hereinafter, “work W” refers to the thin plate-shaped workpiece W). FIG. 1B shows an example of a processing apparatus that supports both ends along the rotation axis of the workpiece W. In addition, the processing apparatus 1 shown to FIG. 1 (A) and (B) is an existing processing apparatus.
As shown in FIG. 1A, the processing apparatus 1 includes a bed 10 on which a column 20 that can reciprocate in the X-axis direction and a bed 30 on which a slide table 31 that can reciprocate in the Z-axis direction are mounted. Are combined.
The column 20 is provided with a saddle 21 that can reciprocate in the Y-axis direction, and the saddle 21 is provided with a main shaft 22 having a rotation axis in the Z-axis direction. A tool T (for example, a ball end mill) is attached to the main shaft 22.
The slide table 31 is provided with a turning table 32 that can turn around the B axis. The turning table 32 has a chuck portion 33 that can turn around the A axis and support the workpiece W. Is provided.
As described above, the machining apparatus 1 is controlled by the five axes of the X axis, the Y axis, the Z axis, the A axis, and the B axis (the numerical control device that controls the five axes is not shown) and is supported by the chuck portion 33. An arbitrary position of the workpiece W can be cut with the tool T from an arbitrary direction.
The processing apparatus 1 shown in FIG. 1B is provided with a pair of chuck portions 33 that can adjust the interval on the turning table 32 with respect to the processing apparatus 1 shown in FIG. However, since the other is the same, the description is omitted.

● [Application and structure of thin plate-shaped workpiece W (Fig. 2)]
Next, an example of the use and structure of the thin plate-shaped workpiece W will be described with reference to FIGS. In use, a plurality of thin plate-shaped workpieces W are attached to the outer peripheral surface of a predetermined rotating member (one end of each thin plate-shaped workpiece W is attached to the predetermined rotating member), and have a wing shape.
For example, the thin plate-shaped workpiece W is used for an aircraft engine, a generator turbine, or the like. FIG. 2A shows an example of a turbine shaft of an aircraft engine and parts attached to the shaft. In FIG. 2A, a plurality of thin plate-shaped workpieces are regularly attached at each of the positions indicated by W1, W2, and W3.
In addition, as shown in FIG. 2B, the structure of each thin plate-shaped workpiece W includes a base portion WB attached to a rotary shaft member (shaft or the like) and a blade portion WW. It has a complicated three-dimensional curved surface according to the application and mounting position (for example, it has a wing shape with a “twist”).

The processing method of the thin plate-shaped workpiece described in the present embodiment uses the existing processing apparatus 1 shown in the example of FIG. 1 (A) or (B), and the three-dimensional curved surface shape of the blade portion WW. This is a method of processing in a shorter time and with higher accuracy than in the prior art.
In the conventional machining method, for example, when machining the workpiece W shown in FIG. 3A, the base portion WB is supported by the chuck portion 33 of the machining apparatus 1 shown in FIG. First, the entire blade portion WW is cut until it is close to the exact size (the remaining margin is about 0.1 mm to 0.5 mm). That is, since the “machining allowance” shown in FIG. 3B is removed from the entire blade part WW, after the tool T for the finishing process is replaced, in the next finishing process, the thinned blade part WW At the tip portion far from the support position, the rigidity of the workpiece W is low, and “chatter” and “bending” are likely to occur. For this reason, it is necessary to perform finishing with sufficiently reduced machining speed and machining allowance, and the machining time becomes long and high-precision machining is difficult.

● [Processing method for thin workpiece W (Fig. 3)]
Next, the processing method of the present embodiment will be described with reference to FIGS.
3A shows an example of a perspective view of the thin plate-shaped workpiece W, and FIG. 3B shows a view of the thin plate-shaped workpiece W viewed from the AA direction in FIG. 3A.
In the processing method of the present embodiment, the shape and material of the thin plate-shaped workpiece W after finishing processing in a supported state without first processing the “whole” of the blade portion WW to near the exact size by rough processing. Based on the rigidity estimated from the above, the blade portion WW is divided into a plurality of machining areas according to the rigidity, and the rough machining is performed in order from the machining area with the lower rigidity (that is, the machining area that is easily deformed). Continue to finish processing. Note that the rigidity can be estimated by a simulation using an existing FEM analysis or the like based on the support position, the finished shape, the material, and the like.

For example, in the case of the workpiece W shown in FIG. 3A, the blade portion WW is divided into a machining area A to a machining area C according to the estimated rigidity. The height of rigidity in this case is assumed to be machining area C> machining area B> machining area A.
Then, at the time of machining, a rough machining tool T is first attached, and the machining area A having the lowest rigidity is roughly machined and cut to near the exact size. Then, the machining area A is finished by exchanging with the finishing tool T, and the machining area A is completed up to finishing. When finishing the machining area A, the machining areas C and B have not yet undergone rough machining, and have a thickness equivalent to the machining allowance, which is sufficiently larger than when machining by the conventional machining method. Since it remains, “chatter” and “deflection” are less likely to occur than in the past. Therefore, the machining accuracy can be improved as compared with the conventional technique, and finishing can be performed in a short time by increasing the machining speed as compared with the conventional technique.
After finishing the machining area A until finishing, replace it with the roughing tool T, then roughen the machining area B with the next lowest rigidity, cut it to near the exact size, and replace it with the finishing tool T To finish the processing area B. In this way, finishing is performed for each processing region sequentially from the processing region with low rigidity toward the processing region with high rigidity. In the case of the example of FIGS. 3 (A) and 3 (B) for supporting and processing one end of the thin plate-shaped workpiece W, in order from the processing region (in this case, processing region A) farthest from the supported end, Cutting after repeating roughing and finishing, and then repeatedly performing roughing on the processing area (in this case, processing area B) on the side farthest from the supported end. Processing.
A more preferable finished shape can be obtained by performing a finishing process that removes the irregularities at the boundary of each processing region after the processing of all the processing regions is completed.

In the machining area with low rigidity, naturally, the feed amount of the tool T and the cutting amount of the tool T must be smaller than the machining area with high rigidity (the higher the rigidity of the machining area, the more the feed amount or the cutting amount). At least one can be larger). Therefore, it is preferable that the rigidity variation width in the machining area is smaller in the machining area with low rigidity (in order to set the feed amount and the cutting amount in accordance with the lowest rigidity).
For this reason, it is preferable to change the division ratio of the machining area so that the machining area becomes larger (the area or the volume becomes larger) from the machining area with low rigidity toward the machining area with high rigidity. In the example of FIGS. 3A and 3B, a division ratio (in this case, a workpiece rotation axis) is directed from the machining area A that is the farthest position from the support position to the machining area C that is the nearest position to the support position. (Length in the (A axis) direction) is gradually increased.

Various methods can be considered as the method of dividing the processing area. For example, the number of divisions (each profit area) is determined as follows.
In the workpiece W machining method according to the present embodiment described above, when the number of division of the machining area is increased, the number of times of replacing the rough machining tool T and the finishing tool T is increased. The accompanying increase time is referred to as “switching work increase time”.
Further, when the number of divisions of the machining area is increased, the movement time from the machining area completed up to the finishing machining to the next machining area increases. The accompanying increase time is referred to as “movement increase time”.
Moreover, by dividing into multiple machining areas, the time that is shortened by increasing at least one of the feed amount or the cutting amount (rough machining is started except for the above switching work increase time and moving time increase time). The time shortened by the time from finishing to completion of finishing processing) is referred to as “processing shortened time”.
Then, divide the machining area at an appropriate position in the simulation, find the division switching work increase time for each machining area, increase time during movement, shortening time during machining, increase / decrease time when machining all machining areas Ask for. Such a division and increase / decrease time simulation is performed, and the number of divisions and the machining area where the increase / decrease time is minimized are determined.

As described above, in the description using FIGS. 3A and 3B, the case where one end of the workpiece W is supported has been described, and thus an example in which rigidity increases as the position approaches the support position from the position farthest from the support position has been described. .
In the following description, a case where both ends of the workpiece W are supported will be described with reference to FIG.
When both ends of the work W are supported, the both supported end portions have high rigidity, and the rigidity in the vicinity of the center, which is a position far from the support position of both end portions, is low. Therefore, in the example shown in FIG. 3C, the machining area A in the vicinity of the center has the lowest rigidity, and the rigidity is, for example, machining area E> machining area D> machining area C> machining area B> machining area. A.
In the case of the example of FIG. 3 (C) in which both ends of the thin workpiece W are supported and processed, rough machining is performed in order from the processing area close to the center with respect to the supported ends (in this case, the processing area A). After the machining is performed, next, a machining process is performed in which a machining area close to the center (in this case, a machining area B) is repeatedly subjected to a roughing process and a finishing process. Therefore, in the example of FIG. 3C, the processing is performed in the order of processing area A-processing area B-processing area C-processing area D-processing area E.
As for the split ratio, as in the case of supporting one end, machining is performed so that the machining area increases from the machining area with low rigidity to the machining area with high rigidity (the area or volume increases). It is preferable to change the area division ratio. In the example of FIG. 3C, the division ratio (in this case, the workpiece rotation axis) from the machining area A that is the farthest position from both supported ends (from both ends) toward the side closer to the supported both ends. (Length in the (A axis) direction) is gradually increased. In the example of FIG. 3C, the division ratio is set as machining area E> machining area D> machining area C> machining area B> machining area A.
Note that the determination of the number of divisions and the finishing process for removing the irregularities at the boundary portions of the respective processing areas are as described above, and thus description thereof is omitted.

● [Appearance and usage examples of tools (Figs. 4 and 5)]
If the “switching work increase time” and the “movement increase time” described above can be shortened, the machining time can be further shortened. Therefore, the inventor has invented a special tool TN capable of selectively performing roughing and finishing without exchanging the tool T, paying attention to the “switching work increase time”. Hereinafter, the appearance and usage of the tool TN will be described.
4A and 4B show examples of a side view and a front view of the tool TN of the present invention, and FIGS. 4C and 4D show examples of a side view and a front view of the conventional tool T. Is shown.

  The conventional tool T shown in FIGS. 4C and 4D has an approximately cylindrical shape, and is an end mill provided with a side blade Ts on the side surface. The side blade Ts extends from the side surface of the substantially cylindrical tool T toward the bottom surface, and the corner portion Tc of the side blade Ts is formed in an arc shape at the boundary between the side surface and the bottom surface. The region Tz around the center of the bottom surface is not provided with a blade, and is formed flat. Further, the conventional tool T has a roughing tool T and a finishing tool T separately.

On the other hand, the tool TN of the present embodiment shown in FIGS. 4A and 4B is the same in that it has a substantially cylindrical shape and a side blade Ts (including the corner portion Tc). However, the difference is that a bottom surface corresponding to the tip of the tool TN is provided with a substantially spherical finishing blade Tt. For example, the finishing blade Tt is a spherical grinding wheel, and the tool TN is a composite end mill in which an end mill and a grinding stone are combined.
The spherical radius of the spherical finishing blade Tt is larger than the radius of the cylindrical bottom surface that is the outer shape of the tool TN. The larger the spherical radius, the more the transfer efficiency is improved and the height of the unevenness on the finished surface can be made smaller. In the present embodiment, the arcuate contour shape of the corner portion Tc of the side blade Ts adjacent to the finishing blade Tt (the contour in the side view shown in FIG. 4A) at the boundary between the cylindrical side surface and the bottom surface. The radius of the circular arc of the shape is smaller than the spherical radius of the finishing blade Tt. Thereby, generation | occurrence | production of chipping (cutting of a blade edge | tip) is suppressed. In addition, the radius of the arc of the corner portion Tc can be formed larger than the spherical radius of the finishing blade Tt, or can be formed in a non-arc shape.
In addition, the shape of the corner portion Tc is adjusted so that the edge portion of the finishing blade Tt is continuous with the corner portion Tc (finishing blade Tt side) with a smooth curve, and at the connection portion between the corner portion Tc and the side surface blade Ts. Also, the shape of the corner portion Tc is adjusted so that the corner portion Tc (the side opposite to the finishing blade Tt) and the side surface blade Ts are smoothly continuous.
As a result, in the side view shown in FIG. 4A, the contour of the finishing blade Tt and the contour of the side blade Ts (contour of the corner portion Tc) are smoothly continuous.
In addition, a coolant supply path Th that penetrates the tool TN and the finishing blade Tt is formed in the tool TN at a position corresponding to the rotation axis (along the rotation axis), and machining is performed from the coolant supply path Th. Coolant is supplied to the location.

In the tool TN described above, the side blade Ts (including the corner portion Tc) is provided as a roughing blade, and a large amount of machining allowance can be cut in a short time (see FIG. 5A). . Further, the finishing blade Tt is provided as a finishing blade, and although the machining allowance is small, the surface can be finished with high accuracy (see FIG. 5B).
Next, the usage of the tool TN described above will be described with reference to FIGS. FIG. 5 (A) shows an example of a state in which the surface of the thin plate-shaped workpiece W is roughly processed using the tool TN, and FIG. 5 (B) shows the surface of the thin plate-shaped workpiece W using the tool TN. The example of the state which is finishing is shown.

When roughing an arbitrary processing area of the thin plate-shaped workpiece W, as shown in FIG. 5A, the side surface Ts (including the corner portion Tc) of the tool TN is brought into contact with the processing surface as shown in FIG. On the other hand, the inclination angle θ1 of the rotation axis of the tool TN is increased, and the tool TN is moved relative to the thin plate-shaped workpiece W along the machining surface for machining. In this case, the finishing blade Tt does not contact the processed surface.
Next, when finishing an arbitrary processing region of the thin plate-shaped workpiece W, as shown in FIG. 5 (B), the finishing blade Tt of the tool TN comes into contact with the processing surface and the side surface blade Ts (corner portion). The inclination angle θ2 of the rotation axis of the tool TN with respect to the machining surface is made small so that the tool TN is relatively positioned along the machining surface with respect to the thin plate-shaped workpiece W so that (including Tc) does not contact the machining surface. Move to process.
As described above, by adjusting the inclination angle of the tool TN with respect to the machining surface, it is not necessary to exchange the tool TN between rough machining and finishing machining, so that the switching work time can be greatly shortened.
In addition, when the inclination angle θ2 of the rotation axis of the tool TN with respect to the thin plate-shaped workpiece W is set during the finishing process in which the finishing blade Tt is brought into contact with the thin plate-shaped workpiece W, the side blade Ts (including the corner portion Tc) is set. The length in the radial direction of the bottom surface of the tool T on the surface of the finishing blade Tt (the length of the radius of the finishing blade Tt) is set so as not to contact the finishing surface of the thin plate-shaped workpiece W.

When the tool TN described above is used, there is no need to exchange the tool TN between the roughing process and the finishing process, so that the workpiece W can be used in the roughing process without being divided into a plurality of machining areas as in the prior art. Even if the whole is machined to near the exact size and then the whole workpiece W is finished, the machining time can be shortened because the tool TN is not required to be replaced.
Further, the finishing blade provided at the tip of the tool TN may be a cutting blade having a larger number of side blades instead of a grindstone (for example, when the number of the side blades Ts is four, ten finishing blades Tt are provided. ). When the number of blades is large, the feed speed of the tool TN can be increased and the machining time can be further shortened even if the height of the unevenness of the finished surface is the same.

The composite end mill and the machining method using the composite end mill of the present invention are not limited to the external shape of the tool TN and the machining method described in the present embodiment, and various modifications and additions are made without changing the gist of the present invention. Can be deleted.
Moreover, the processing method of the thin plate-shaped workpiece described in the present embodiment is not limited to the processing apparatus 1 shown in the examples of FIGS. 1A and 1B, and can be applied to various processing apparatuses. Is possible.
Moreover, the external shape of the tool TN is not limited to the external shape shown in FIGS. 4 (A) and 4 (B).

It is a figure explaining the general | schematic external view (perspective view) in one Embodiment of the processing apparatus 1 which applied the processing method using the composite end mill of this invention to the process of a thin plate-shaped workpiece. It is a figure explaining the example of the use of a thin plate-shaped workpiece W, and a structure. It is a figure explaining the processing method of the thin-plate shaped workpiece | work of this invention. It is a figure explaining the external appearance of the tool TN (composite end mill) of this invention. It is a figure explaining the usage of the tool TN (composite end mill) of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing apparatus 10 Bed 20 Column 21 Saddle 22 Spindle 30 Bed 31 Slide table 32 Turning table 33 Chuck part TN, T Tool Ts Side blade Tc Corner part Tt Finishing blade Th Coolant supply path W Thin plate-shaped work (work)
θ1, θ2 tilt angle

Claims (7)

Having a substantially cylindrical shape,
Side blades are provided on the side,
The bottom part which is the tip part is provided with a substantially spherical finishing blade,
The spherical radius of the finishing blade is larger than the radius of the bottom surface where the finishing blade is provided,
Composite end mill. The composite end mill according to claim 1,
In the boundary portion between the side surface portion and the bottom surface portion, the corner portion adjacent to the finishing blade in the side surface blade is formed in an arc shape having a contour having a radius smaller than the spherical radius of the finishing blade.
Composite end mill. A composite end mill according to claim 1 or 2,
When viewed from the direction orthogonal to the side surface, the contour of the finishing blade and the contour of the side blade are smoothly continuous.
Composite end mill. The composite end mill according to any one of claims 1 to 3,
A coolant supply path is provided along the rotation axis of the composite end mill to pass through the interior of the composite end mill and supply coolant to the tip.
Composite end mill. The composite end mill according to any one of claims 1 to 4,
When the inclination angle of the rotary shaft of the composite end mill with respect to the workpiece is set during the finishing process in which the finishing blade is brought into contact with the workpiece, the side edge of the finishing blade is prevented from coming into contact with the finished surface of the workpiece. The length in the radial direction of the bottom surface portion on the surface is set,
Composite end mill. A composite end mill according to any one of claims 1 to 5,
The finishing blade is a grindstone;
Composite end mill. A machining method using a composite end mill that cuts a workpiece surface using the composite end mill according to any one of claims 1 to 6,
When roughing any surface of the workpiece,
An inclination angle of a rotation axis of the composite end mill is increased with respect to the processing surface so that the side edge of the composite end mill is in contact with the processing surface, and the composite end mill is relatively moved with respect to the workpiece. And move along
When finishing any surface of the workpiece,
The inclination angle of the rotary shaft of the composite end mill is reduced with respect to the processing surface so that the finishing blade of the composite end mill is in contact with the processing surface and the side blade is not in contact with the processing surface. Processing is performed by moving the composite end mill relative to the workpiece along the processing surface.
Processing method using a composite end mill.

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