JP6533071B2 - Non-circular hole processing method, non-circular hole processing device and lens - Google Patents

Description

  The present invention relates to a non-circular hole processing method, a non-circular hole processing apparatus, and a lens, and more particularly to a method for providing a non-circular hole in a workpiece with a cutting tool while rotating the workpiece.

  The lens 1 (see FIG. 1 and FIG. 2) made of resin (plastic) pours the molten resin into the cavity 7 of the die 3 through the gate 5 of the die 3 (see FIG. 3 and FIG. 4) The resin is manufactured by cooling and solidifying the resin.

  The functional area (area functioning as the lens 1; convex lens-like part) 9 in the lens 1 is circular when viewed from the optical axis direction. Further, an annular flange portion 11 is provided outside the functional area 9 so as to surround the functional area 9 in such a manner that the inner periphery of the flange portion 11 is connected to the outer periphery of the functional area 9.

  The gate portion 5 of the lens 1 is connected to the resin injection channel (runner portion) 13. Thereby, the lens 1 and the runner portion 13 are cut at the gate portion 5 to obtain the lens (shaped lens) 1 having the functional area 9 and the flange portion 11.

  In addition, in the lens 1, when a part of the cut portion of the gate portion 5 remains, the lens 1 can not be accurately disposed in the lens barrel. Therefore, a notch 15 is provided in a part of the flange portion 11 and the lens 1 is formed in a D shape in plan view (when the lens 1 is viewed from the optical axis direction), inside the virtual outer periphery circle of the flange portion 11 The gate unit 5 is disposed. As a result, even if the gate 5 has the remaining cut portion, the remaining cut portion is prevented from interfering with the lens barrel, and the lens 1 can be accurately disposed in the lens barrel.

  In addition, patent documents 1-patent documents 3 can be mentioned, for example as a literature about conventional technology.

Japanese Patent Application Laid-Open No. 10-81525 JP, 2009-47820, A Unexamined-Japanese-Patent No. 2004-219594

  By the way, when manufacturing the mold 3 used for molding of the lens 1 (especially, when providing the D-shaped cavity 7 in the material 19 of the mold 3 by cutting), as shown in FIG. 7 and FIG. Since the inner surface is processed, there is a problem that the cutting tool 17 interferes with the portion of the cavity 7 corresponding to the notch 15 of the flange portion 11 of the lens 1 (see FIGS. 8A and 8B). is there.

  A circular portion 21 of the cavity 7 corresponding to the functional area 9 of the lens 1 is provided by turning, and thereafter, a portion 23 of the cavity 7 corresponding to the flange portion 11 of the lens 1 is It is also conceivable to provide with another processing machine different from a lathe, but the relative replacement between the portion 21 of the cavity 7 and the portion 23 is possible by carrying out the step change of the material 19 Positional relationship comes around. In the lens 1 molded by the mold 3, the position of the flange portion 11 with respect to the functional area 9 becomes inaccurate, and the lens 1 can not be accurately disposed in the lens barrel.

  In addition, the above-mentioned problem is a problem which generate | occur | produces similarly, also when providing non-circular shaped holes in metal mold | dies other than the metal mold | die for lenses, and another to-be-processed object.

  The present invention has been made in view of the above problems, and a method and apparatus for processing non-circular holes formed in a workpiece by cutting non-circular holes with a cutting tool It aims at providing what can prevent a cutting tool interfering with the wall surface of a noncircular shaped hole.

The invention according to claim 1 is a method of processing a noncircular hole in which a noncircular hole is formed in a workpiece by cutting using a cutting tool, the first axis, the second axis, It is avoided that the flank of the cutting tool interferes with the wall surface of the noncircular hole while rotating the workpiece about the first axis of which the third axis forms an orthogonal coordinate system. As described above, the cutting tool is moved by moving the cutting tool in the axial direction of the second axis and the axial direction of the third axis, and the three-dimensional shape of the non-circular hole is a flat side surface And the first axis coincides with the axial direction of the Z-axis, which is the central axis of the non-cylindrical solid, and the second axis is the non-cylindrical solid. An X axis orthogonal to an axis of 1 and the third axis is Y orthogonal to the first axis and the second axis When the cutting process is performed, the workpiece is rotated in a predetermined direction about the Z axis as a rotation center, and the cutting process of the non-cylindrical solid planar side surface is started. The coordinate value of the Y-axis of the cutting edge of the cutting tool is “0” from the time it is cut to the time when the cutting of the non-cylindrical solid planar side surface is finished and the workpiece is rotated by a predetermined angle. Gradually increase to a maximum value and then return to "0" again, gradually decreasing the coordinate value of the X axis of the cutting edge of the cutting tool from "the value of the radius of the non-cylindrical solid" to a minimum value Then, the value of the radius of the non-cylindrical solid is returned to the value of the non-cylindrical solid again.

The invention according to claim 2 is the method for processing a non-circular hole according to claim 1 , wherein the non-cylindrical solid is a D-shaped columnar solid.

The invention according to claim 3 is the method for processing a non-circular hole according to claim 2 , wherein the workpiece is a method for processing a non-circular hole which is a material of a mold.

The invention according to claim 4 is a lens formed using a mold manufactured by the method for processing a non-circular hole according to claim 3 .

The invention according to claim 5 is a non-circular hole processing apparatus for forming a non-circular hole in a workpiece by cutting using a cutting tool, the workpiece being installed, and the installation A workpiece installation unit for rotating the machined workpiece about the first axis whose first axis, second axis, and third axis form an orthogonal coordinate system, and the cutting tool A tool setting unit which is capable of moving and positioning the installed cutting tool in the axial direction of the second axis and the axial direction of the third axis, and cutting the wall surface of the non-circular hole The tool setting unit is moved to move the cutting tool in the axial direction of the second axis and the axial direction of the third axis so as to avoid interference of the flanks of the tool, and and a control unit for rotating the workpiece installation portion, the three-dimensional form of the non-circular hole Is a non-cylindrical solid having at least one or more planar side surfaces, and the first axis coincides with the axial direction of the Z-axis which is the central axis of the non-cylindrical solid; Axis is an X axis orthogonal to the first axis, and the third axis is a Y axis orthogonal to the first axis and the second axis, and the cutting process When doing this, the object to be processed is rotated in a predetermined direction about the Z axis as the rotation center, and the non-circular solid side surface of the non-cylindrical solid is started to be cut from the non-circular shape. The Y-axis coordinate value of the cutting edge of the cutting tool is gradually increased from “0” until the end of cutting of the planar side surface of the columnar solid and the workpiece is rotated by a predetermined angle. After making the maximum value, return it to "0" again, and set the coordinate value of the X axis of the cutting edge of the cutting tool A processing device for radius values "from the gradually reduced to is configured to return again after the minimum value" the radius values of the non-cylindrical three-dimensional "non-circular hole.

  According to the present invention, a non-circular hole is formed by cutting a non-circular hole using a cutting tool, and the non-circular hole processing method and non-circular hole processing device formed in a workpiece There is an effect that the cutting tool can be prevented from interfering with the wall surface.

It is a figure which shows the lens shape | molded using the metal mold | die manufactured with the processing method of the non-circular hole which concerns on embodiment of this invention. It is a figure which shows the II-II cross section in FIG. It is a figure which shows the metal mold | die manufactured by the processing method of the non-circular hole which concerns on embodiment of this invention. It is a figure which shows the IV-IV cross section in FIG. It is a figure which shows the processing method of the non-circular hole which concerns on embodiment of this invention. It is a figure which shows the processing method of the non-circular hole which concerns on embodiment of this invention. It is a figure which shows the conventional processing aspect. It is a figure which shows the conventional processing aspect.

  The processing method of the non-circular (non-cylindrical) hole according to the embodiment of the present invention is, for example, generating the mold 3 shown in FIG. 3 and FIG. 4 by processing the workpiece (material) 19. In particular, it is used when processing the cavity 7 (part of the cavity 7) including the non-circular hole (hole) 30 of the mold 3. The lens 1 shown in FIG. 1 and FIG. 2 is formed by using a mold 3. The lens 1 is configured to include a functional area 9 and a flange portion 11 as in the conventional one.

  The method of processing non-circular holes will be further described. The method of processing non-circular holes is, as shown in FIG. 3, a non-circular hole (a hole whose outer periphery looks non-circular when viewed from the depth direction; planar shape (shape viewed from the Z-axis direction) This is a processing method of forming a part of the cavity 7 in the mold 3 by cutting the material 19 using a cutting tool (cutting tool) 17 to cut the hole (30) that looks non-circular.

  The non-circular hole processing method is performed while rotating the workpiece 19 around a predetermined first axis.

  Moreover, in the processing method of the non-circular hole, the axial direction of the predetermined second axis and the predetermined third to prevent the flank 25 of the cutting tool 17 from interfering with the wall surface 27 of the non-circular hole 30. The cutting tool 17 is moved in synchronization with the rotation of the workpiece 19 in the axial direction of the axis of the shaft, and the wall surface 27 of the cavity 7 is cut with the cutting tool 17 (see FIGS. 5 and 6). ).

  Note that the first axis is an axis (for example, the Z axis) that is the central axis of the noncircular hole 30, and the second axis is a predetermined direction (for example, different from the axial direction of the first axis (for example, , A predetermined direction orthogonal to the Z axis) (eg, an X axis), and the third axis is a predetermined direction different from the axial direction of the first axis and the axial direction of the second axis It is an axis (for example, Y-axis) extending in a direction (for example, a predetermined direction orthogonal to the Z-axis and the X-axis), and the first to third axes form an orthogonal coordinate system.

  Moreover, in the processing method of the non-circular hole, the cutting tool 17 is appropriately moved also in the axial direction of the first axis (the depth direction of the non-circular hole 30).

  Cutting by the cutting tool 17 is performed by two-dimensional cutting such as a turning machine. When the rake angle at the time of cutting is a positive value, the blade angle of the cutting tool 17 is smaller than 90 °.

  In addition, although the non-circular hole 30 formed by cutting process forms a part of cavity 7, the whole non-circular hole 30 may form the cavity 7. FIG.

  The shape of the wall surface 27 of the non-circular hole 30 is formed in the side shape of a D-shaped columnar solid (non-cylindrical solid). The D-shaped columnar solid is a shape of one solid (for example, a solid having a larger volume) obtained when the cylinder is cut into two in one plane parallel to the central axis. The central axis of the D-shaped columnar solid (the central axis of the cylinder before cutting) coincides with the Z axis.

  When the above-described cutting is performed, the workpiece 19 rotates in a predetermined direction (one direction) with the Z axis as a rotation center.

  Moreover, when performing the said cutting, it was assumed that the planar side (planar part) (the said cutting | disconnection was carried out) of the side (wall surface 27 of the non-circular hole 30) of the side of D character columnar solid (non-cylindrical solid). In the case where the cutting of the cut surface 29) is started (see FIG. 5 (b)), the cutting of the flat portion 29 of the side surface of the D-shaped column is finished (see FIG. 5 (d)). Until the workpiece 19 is rotated by an angle (see FIG. 6C), the Y-axis coordinate value of the cutting edge 31 of the cutting tool 17 is gradually increased from "0" to a maximum value, and then " Then, the coordinate value of the X axis of the cutting edge 31 of the cutting tool 17 is gradually reduced from the value r of the radius of the D-shaped columnar solid to a minimum value, and then the radius of the D-shaped columnar solid again The value of "r" is to be returned.

  This will be described in more detail with reference to FIGS. 5 and 6.

  5 and 6 show a state in which the workpiece 19 is placed on the spindle stock of a lathe (not shown) in order to process the D-shaped hole (non-circular hole) 30 in the workpiece 19. It is a figure which shows the state seen in Z-axis direction which goes to a headstock side from a pressing stand side. In FIGS. 5 and 6, the workpiece 19 is designed to rotate clockwise about the Z axis. The cutting tool 17 is installed on a tool rest, and the tool rest is movable in the X-axis direction and the Y-axis direction.

  In addition, the radius of the D-shaped columnar hole 30 (radius of the cylinder before cutting) is “r”, and the distance between the center of the D-shaped columnar hole 30 (center of the cylinder before cutting) and the center of the planar portion 29 The value of the distance is set to the notch width B, and the central angle of the planar portion 29 is set to “α °” (see FIG. 5A). “R” is, for example, 6 mm, and “α °” is, for example, “60 °”. In the state shown in FIG. 5A, the planar portion 29 is parallel to the X axis. The rotation angle of the workpiece 19 in the state shown in FIG. 5A is “0 °”. In the state shown in FIG. 5A, the value of the X coordinate of the cutting edge 31 of the cutting tool 17 is "r", and the value of the Y coordinate is "0".

  When the workpiece 19 is rotated by an angle "(180 ° -α °) / 2" from the state of the rotation angle "0 °" shown in FIG. 5A, the state shown in FIG. 5B is obtained. Between the state shown in FIG. 5 (a) and the state shown in FIG. 5 (b), the coordinate value of the cutting edge 31 maintains the value in the state shown in FIG. 5 (a). Cutting of the arc-shaped portion 33 on the side surface of the letter-columnar solid is performed. In the state shown in FIG. 5B, the processing of the planar portion 29 of the wall surface 27 of the D-shaped columnar hole 30 is started.

  By further rotating the workpiece 19 from the state shown in FIG. 5B, the state shown in FIG. 5C is obtained. The rotation angle θ of the workpiece 19 in the state shown in FIG. 5C becomes a value within the range of “(180 ° −α °) / 2 <θ <90 °”. Further, in the state shown in FIG. 5C, cutting of the planar portion 29 of the side surface of the D-shaped column is performed. By further rotating the workpiece 19 from the state shown in FIG. 5C, the state shown in FIG. 5D is obtained.

  Furthermore, in the state shown in FIG. 5C, the value of the X coordinate of the cutting edge 31 of the cutting tool 17 gradually decreases from “r” and becomes a local minimum (a local minimum smaller than the value of the notch width B). After that, it gradually increases until it comes to the state shown in FIG. 5 (d) (until it reaches the value of the notch width B). Further, in the state shown in FIG. 5C, the value of the Y coordinate of the cutting edge 31 of the cutting tool 17 gradually increases from “0” to the state shown in FIG. 5D.

In the state shown in FIG. 5D, the rotation angle θ of the workpiece 19 is “90 °”. In the state shown in FIG. 5D, the processing of the planar portion 29 of the wall surface 27 of the D-shaped columnar hole 30 is completed. Moreover, in the state shown in FIG. 5D, the value of the X coordinate of the cutting edge 31 of the cutting tool 17 is "B", and the value of the Y coordinate of the cutting edge 31 of the cutting tool 17 is "(r ² -B ² ) ^1/2 ".

  By further rotating the workpiece 19 from the state shown in FIG. 5D, the state shown in FIGS. 6A and 6B is obtained. The rotation angle θ of the workpiece 19 in the state shown in FIGS. 6A and 6B is a value within the range of “90 ° <θ <180 °”. Further, in the state shown in FIGS. 6A and 6B, cutting of the arc-shaped portion 33 on the side surface of the D-shaped columnar solid is performed. When the workpiece 19 is further rotated from the state shown in FIGS. 6 (a) and 6 (b), the state shown in FIG. 6 (c) is obtained. In the state shown in FIG. 6C, the planar portion 29 is parallel to the X axis.

In the state shown in FIGS. 6A and 6B, the value of the X coordinate of the cutting edge 31 of the cutting tool 17 gradually increases from “B” to the state shown in FIG. It becomes "r" in the state shown by). Further, in the state shown in FIGS. 6A and 6B, the Y coordinate value of the cutting edge of the cutting tool 17 is changed from “(r ² −B ² ) ^1/2 ” to the state shown in FIG. 6C. It becomes smaller gradually until it becomes, and becomes "0" in the state shown in FIG. 6 (c).

  By further rotating the workpiece 19 from the state shown in FIG. 6C, the state shown in FIG. 5A is obtained. Between the state shown in FIG. 6C and the state shown in FIG. 5A, the coordinate value of the cutting edge 31 maintains the value in the state shown in FIG. Cutting of the arc-shaped portion 33 on the side surface of the letter-columnar solid is performed.

  5 (b), 5 (c), 5 (d), 6 (a), 6 (b) and 6 (c) from the state shown in FIG. 5 (a). By returning to the state shown in (a), cutting for one rotation in the workpiece 19 is performed. In actual processing, for example, while the workpiece 19 rotates a plurality of times, the X-axis coordinate value and the Y-axis coordinate value become gradually larger so that the cutting tool 17 enlarges the diameter of the D-shaped columnar hole 30. Behave like Also, the cutting tool 17 is appropriately moved in the Z-axis direction in order to make the depth of the D-shaped columnar hole 30 deeper.

  For example, the cutting speed is 1 m / min, the cutting amount is 0.01 mm for both roughing and finishing, the feeding is 0.02 mm / rev for roughing, and 0.005 mm for finishing. / Rev.

  In addition, if it is a conventional aspect which the cutting tool 17 does not move to Y-axis direction, as shown in FIG. 7, FIG. 8, the wall surface 27 of the D-shaped hole 30 in the middle of the cutting process of the D-shaped hole 30. The flank surface 25 of the cutting tool 17 interferes with the (planar portion 29) (in particular, refer to FIGS. 8A and 8B).

  According to the processing method of the non-circular hole according to the embodiment of the present invention, the flank surface 25 of the cutting tool 17 is formed on the side surface of the non-circular hole 30 while rotating the workpiece 19 around the Z axis. In order to avoid interference, the cutting tool 17 is moved in the axial direction of the X axis and the axial direction of the Y axis to cut the non-circular hole 30, so the cutting tool 17 in the non-circular hole 30 is cut. It is possible to prevent the flank 25 from interfering with each other.

  In order to avoid the above-mentioned interference, it is conceivable to reduce the blade angle of the cutting tool 17 to increase the clearance angle in cutting, but by reducing the blade angle, the rigidity of the cutting tool 17 is reduced. There is a risk that problems such as breakage of the cutting edge will occur. However, in the non-circular hole machining method according to the embodiment of the present invention, since the blade angle of the cutting tool 17 is not reduced, a cutting tool that is usually used without using a specially shaped cutting tool (cutting With one cutting tool) without changing the tool, and without changing the work piece 19, so-called one-chuck, non-circular hole 30 (planar portion 29) with high accuracy It can be formed without reducing the mass productivity. Further, since the portions 21 and 23 of the cavity 7 can be processed by one chuck, in the lens 1, the position of the flange portion 11 with respect to the functional area 9 can be made accurate.

  In the above description, although the D-shaped columnar hole 30 is described as an example, the non-circular shaped hole other than the D-shaped columnar can be processed by moving the cutting edge 31 of the cutting tool 17 as appropriate. Good. For example, an elliptical cylindrical hole, a long cylindrical hole, or a part of a circular arc is cut with two straight lines, and has a flat part, the width of two straight lines is shorter than the diameter of the circular arc, A hole having a shape having an edge (for example, a barrel shape), a hole provided at a plurality of three or more flat places with respect to the center of the hole, and a position equally distributing the circumference of the hole, You may process the hole (For example, the hole of a triangular prism, the hole of a square prism, the hole of a polygonal pillar like a hole of a pentagonal pillar, etc.) which were all enclosed by a straight line.

  Moreover, as a processing apparatus which realizes the processing method of the non-circular hole which concerns on embodiment of this invention, what is shown next can be illustrated.

  The above processing apparatus (not shown) is a processing apparatus (for example, a lathe) for non-circular holes formed in a workpiece by cutting non-circular holes with a cutting tool.

  Further, in the processing apparatus, a base body (bed) and the object to be processed are integrally installed, and the installed object to be processed is a predetermined first axis (a central axis of a noncircular hole) For example, a workpiece installation portion (a workpiece installation body: a spindle head) which is rotated about an axis (eg, Z axis) as a rotation center, and the cutting tool are integrally installed, and the installed cutting tool is first A second axis (for example, the X axis orthogonal to the Z axis) different from the axial direction of the first axis and a third axis different from the axial direction of the first axis and the second axial direction For example, when the tool installation part (tool installation body; cutter rest) which can be moved and positioned in the axial direction of the Y axis) and the cutting process is performed, the cutting tool The axial direction of the second axis and the axial direction of the third axis to avoid interference of the flanks Wherein with moving the tool installation portion so as to move the cutting tool, wherein the is configured to include a control unit for rotating the workpiece installation portion, to.

  The workpiece installation portion is rotatable by an actuator such as a servomotor with the first axis as a rotation center with respect to the base body. Further, the workpiece mounting portion is provided with a clamp for fixing the workpiece.

  The movement and positioning of the tool installation unit will be described. The non-circular hole processing apparatus is provided with a first tool placement support and a second tool placement support. The first tool mounting portion support is engaged with the base body so as to be movable in the axial direction of the first shaft, and is moved relative to the base body in the axial direction of the first shaft by an actuator such as a servomotor. It is mobile.

  The second tool mounting portion support is engaged with the first tool mounting portion support so as to be movable in the axial direction of the second shaft, and the axis of the second shaft is moved by an actuator such as a servomotor. It is movable relative to the first tool support in direction.

  The tool setting portion is engaged with the second tool setting portion support so as to be movable in the axial direction of the third axis, and an actuator such as a servomotor is used to move the second portion in the axial direction of the third axis. It is movable relative to the tool placement support. As described above, the cutting tool installed in the tool installation body can move and position relative to the base body in the axial direction of the first axis, the axial direction of the second axis and the axial direction of the third axis. .

  The control unit is configured to include an input unit that inputs cutting data of a workpiece, a memory that stores a processing program of the workpiece, and a CPU, and a CPU.

  Then, an actuator for rotating the workpiece installation unit, an actuator for moving and positioning the tool installation unit in the axial direction of the first axis, and a tool installation unit are provided. An actuator that moves and positions in the axial direction of the second axis and an actuator that moves and positions the tool installation unit in the axial direction of the third axis are appropriately controlled.

1 lens 3 mold 17 cutting tool 19 workpiece (material)
25 flank of cutting tool 27 wall surface of non-circular hole 29 flat side of non-cylindrical solid (flat portion of non-cylindrical solid)
30 Non-circular hole (D-shaped hole)
31 Cutting edge r radius value of D-shaped columnar solid

Claims (5)

In a non-circular hole processing method for forming a non-circular hole in a workpiece by cutting using a cutting tool,
The cutting is performed on the wall surface of the non-circular hole while the workpiece is rotated about the first axis of which the first axis, the second axis, and the third axis form an orthogonal coordinate system. The cutting is performed by moving the cutting tool in the axial direction of the second axis and the axial direction of the third axis so as to avoid interference of the flanks of the tool ;
The three-dimensional shape of the non-circular hole is a non-cylindrical solid having at least one or more planar side surfaces,
The first axis coincides with an axial direction of a Z axis which is a central axis of the non-cylindrical solid,
The second axis is an X axis orthogonal to the first axis,
The third axis is a Y-axis orthogonal to the first axis and the second axis,
When the cutting process is performed, the workpiece is rotated in a predetermined direction around the Z axis as a rotation center, and the cutting process of the non-cylindrical solid planar side surface is started. The coordinate value of the Y-axis of the cutting edge of the cutting tool is gradually increased from “0” until the processing of the non-cylindrical solid planar side surface is finished and the workpiece is rotated by a predetermined angle. After increasing it to the maximum value, return it to “0” again and gradually reduce the X-axis coordinate value of the cutting edge of the cutting tool from “the value of the radius of the non-cylindrical solid” to make it the minimum value again A method of processing a non-circular hole, characterized in that the value is returned to "the value of the radius of the non-cylindrical solid" . In the method for processing a non-circular hole according to claim 1 ,
The non-cylindrical solid is a D-shaped columnar solid. In the method of processing a non-circular hole according to claim 2 ,
The method of processing a non-circular hole, wherein the object to be processed is a material of a mold. A lens formed by using a mold manufactured by the method for processing a non-circular hole according to claim 3 . In a non-circular hole processing apparatus for forming a non-circular hole in a workpiece by cutting using a cutting tool,
The workpiece to be processed is installed, and the workpiece to be processed is rotated with the first axis, the second axis, and the third axis forming an orthogonal coordinate system, as a rotation center. Workpiece installation section,
A tool setting unit in which the cutting tool is installed, and the installed cutting tool can be moved and positioned in the axial direction of the second axis and the axial direction of the third axis;
The cutting tool is moved in the axial direction of the second axis and the axial direction of the third axis so as to avoid interference of the flank of the cutting tool with the wall surface of the non-circular hole. A control unit for moving the tool installation unit and rotating the workpiece installation unit ,
The three-dimensional shape of the non-circular hole is a non-cylindrical solid having at least one or more planar side surfaces,
The first axis coincides with an axial direction of a Z axis which is a central axis of the non-cylindrical solid,
The second axis is an X axis orthogonal to the first axis,
The third axis is a Y-axis orthogonal to the first axis and the second axis,
When the cutting process is performed, the workpiece is rotated in a predetermined direction around the Z axis as a rotation center, and the cutting process of the non-cylindrical solid planar side surface is started. The coordinate value of the Y-axis of the cutting edge of the cutting tool is gradually increased from “0” until the processing of the non-cylindrical solid planar side surface is finished and the workpiece is rotated by a predetermined angle. After increasing it to the maximum value, return it to “0” again and gradually reduce the X-axis coordinate value of the cutting edge of the cutting tool from “the value of the radius of the non-cylindrical solid” to make it the minimum value again An apparatus for processing a non-circular hole, which is configured to return to "the value of the radius of the non-cylindrical solid" .

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