TWI605892B - Non-circular hole processing methods, non-circular hole processing device and lens - Google Patents

Description

Non-circular hole processing method, non-circular hole processing device and lens

The present invention relates to a method for processing a non-circular hole, a processing device for a non-circular hole, and a lens, and more particularly to a hole in which a non-circular shape is formed in a workpiece by a cutting tool while rotating the workpiece.

The lens 1 (see FIG. 1 and FIG. 2) made of a resin (plastic) flows into the mold 3 by passing the resin in a molten state through the gate portion 5 of the mold 3 (see FIGS. 3 and 4). After filling in the cavity 7, the resin is cooled and solidified to be produced.

When viewed from the optical axis direction, the functional region of the lens 1 (the region that functions as the lens 1 and the convex lens-like portion) 9 are formed in a circular shape. Further, it is provided in such a manner that the annular flange portion 11 surrounds the functional region 9 outside the functional region 9 such that the inner circumference of the flange portion 11 is connected to the outer periphery of the functional region 9.

The gate portion 5 of the lens 1 is connected to a resin injection flow path (flow path portion) 13. Thereby, the lens 1 and the flow path portion 13 are cut at the gate portion 5, and a lens having the functional region 9 and the flange portion 11 is obtained (formation) Lens) 1.

Further, when a part of the cut portion of the gate portion 5 remains on the lens 1, the lens 1 cannot be disposed in the lens barrel with good precision. Here, the notch 15 is provided in a part of the flange portion 11, and the lens 1 is formed in a D-shape in a plan view (view of the lens 1 from the optical axis direction), and the gate portion 5 is disposed on the flange portion. The imaginary outer circumference of the portion 11 is further inside. Thereby, even if the gate portion 5 has a residue at the cutting portion, the residual portion at the cutting portion is prevented from interfering with the lens barrel, and the lens 1 can be disposed in the lens barrel with good precision.

Further, as a patent document relating to a conventional technique, for example, Patent Document 1 to Patent Document 3 can be exemplified.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 10-81525

[Patent Document 2] JP-A-2009-47820

[Patent Document 3] JP-A-2004-219594

However, when the mold 3 used for the molding of the lens 1 is manufactured (particularly, when the D-shaped cavity 7 is provided in the raw material 19 of the mold 3 by cutting), there are the following problems: As shown in Fig. 8, since the inner surface machining is performed, the cutting tool 17 will be in the cavity 7 Interference occurs at a portion corresponding to the notch 15 of the flange portion 11 of the lens 1 (see Figs. 8(a) and 8(b)).

Further, although the circular shape portion 21 corresponding to the functional region 9 of the lens 1 in the cavity 7 can be provided by the turning process, and then the other machine in the cavity 7 is set by using another processing machine different from the rotary disk. The portion 23 of the lens portion 11 corresponding to the flange portion 11 is opposite to the portion 23 of the cavity 7 due to the need to replace the material 19 (so-called ONE CHUCK PROCESSING). The positional relationship is out of order. In the lens 1 formed by the mold 3, the position of the flange portion 11 with respect to the functional region 9 is formed to be incorrect, and the lens 1 cannot be disposed in the lens barrel with good precision.

Further, the above-described problem is a problem that occurs similarly in the case where a mold other than the mold for a lens or another workpiece is provided with a hole having a non-circular shape.

The present invention has been made in view of the above problems, and an object thereof is to provide a method for processing a non-circular hole and a processing apparatus for forming a non-circular shape in a workpiece by cutting using a cutting tool. The hole can prevent the cutting tool from interfering with the wall surface of the non-circular shape hole.

The invention described in claim 1 is a method for processing a non-circular hole, which is a non-circular hole in which a non-circular hole is formed in a workpiece by cutting using a cutting tool. In the method, the first axis of the Cartesian coordinate system formed by the first axis, the second axis, and the third axis serves as a rotation center, and the cutting tool is rotated toward the axis of the second axis while rotating the workpiece. The cutting process is performed by moving in the axial direction of the third shaft, and it is possible to prevent interference between the blade surface of the cutting tool and the wall surface of the non-circular hole.

The invention described in claim 2 is the method for processing a non-circular hole according to the first aspect of the invention, wherein the non-circular shape is a three-dimensional hole. The shape is a non-cylindrical three-dimensional shape having at least one planar side surface, and the first axis is aligned with an axial direction of a Z-axis which is a central axis of the non-cylindrical solid, and the second axis and the first The axis is orthogonal to the X axis, and 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 formed so that the Z axis is a rotation center. Rotating in a predetermined direction, and cutting the side surface of the non-cylindrical three-dimensional plane from the start of cutting the non-cylindrical planar side surface, and then rotating the workpiece only by a predetermined amount In the period from the angle, the coordinate value of the Y-axis of the cutting edge of the cutting tool is gradually increased from "0" to the maximum value and then returned to "0", and the coordinate of the X-axis of the cutting edge of the cutting tool is set. Narrow extremely small value gradually from "the aforementioned non-dimensional cylindrical radius value," then return to "the aforementioned non-dimensional cylindrical radius value."

The invention described in claim 3 is a method for processing a non-circular hole, which is a method for processing a non-circular hole according to the second aspect of the patent application, wherein the non-cylindrical solid is a D-shaped column. shape stereoscopic.

The invention described in claim 4 is a method for processing a non-circular hole according to the third aspect of the invention, wherein the object to be processed is a material of a mold.

The invention described in claim 5 is a lens formed by a mold produced by a method for processing a non-circular hole described in the fourth application of the patent application.

The invention described in claim 6 is a processing apparatus for a non-circular hole, which is a non-circular hole processing device for forming a non-circular hole in a workpiece by cutting using a cutting tool. The object to be processed is provided in the workpiece to be processed, and the first axis of the Cartesian coordinate system formed by the first axis, the second axis, and the third axis is used as a rotation center to process the set. a rotation of the body; the tool setting portion is provided in the cutting tool, and the set cutting tool is freely movable in the axial direction of the second axis and the axial direction of the third axis to perform positioning; and the control unit causes the aforementioned When the tool setting portion moves and rotates the workpiece installation portion, the cutting tool moves in the axial direction of the second axis and the axial direction of the third axis, thereby avoiding the non-circular shape of the cutting tool and the non-circular shape. The wall surface of the shaped hole creates interference.

According to the present invention, it is possible to achieve an effect of forming a non-circular shape in a workpiece by cutting using a cutting tool. In the processing method of the non-circular hole of the hole and the processing apparatus of the non-circular hole, it is possible to prevent the cutting tool from interfering with the wall surface of the non-circular hole.

1‧‧‧ lens

3‧‧‧Mold

17‧‧‧Cutting tools

19‧‧‧Processed body (raw material)

25‧‧‧ cutting tool blade

27‧‧‧Walls of non-circular holes

29‧‧‧ Non-cylindrical, three-dimensional planar side (non-cylindrical three-dimensional planar part)

30‧‧‧Non-circular holes (D-column holes)

31‧‧‧ cutting edge

r‧‧‧D-shaped columnar solid radius value

Fig. 1 is a view showing a lens formed by a mold produced by a method for processing a non-circular hole disclosed in an embodiment of the present invention.

Fig. 2 is a view showing a cross section taken along line II-II in Fig. 1.

Fig. 3 is a view showing a mold made by a method of processing non-circular holes disclosed in an embodiment of the present invention.

Fig. 4 is a view showing a section IV-IV in Fig. 3.

Fig. 5 is a view showing a method of processing a non-circular hole disclosed in an embodiment of the present invention.

Fig. 6 is a view showing a method of processing a non-circular hole disclosed in an embodiment of the present invention.

Figure 7 is a diagram showing the processing aspect of the prior art.

Figure 8 is a diagram showing the processing aspect of the prior art.

The method for processing a non-circular (non-cylindrical) hole disclosed in the embodiment of the present invention is obtained by processing a workpiece (raw material) 19 to produce, for example, a mold 3 shown in Figs. 3 and 4, in particular It is used when processing the cavity 7 (a part of the cavity 7) of the hole 3 (hole) 30 of the mold 3 including a non-circular shape. Using the mold 3 to shape the first The lens 1 shown in Fig. 2 is shown. The lens 1 is configured to include the functional region 9 and the flange portion 11 in the same manner as those of the prior art.

A method of processing a non-circular hole is further explained. The processing method of the non-circular hole is a processing method in which, as shown in Fig. 3, the material 19 is cut by a cutting tool (cutter) 17, and a non-circular hole is formed on the mold 3 (from the depth) The outer circumference is a hole having a non-circular shape when viewed in the direction; a hole having a planar shape (a shape viewed from the Z-axis direction) having a non-circular shape) is formed as a part of the cavity 7.

The processing method of the non-circular hole is performed while rotating the workpiece 19 with the predetermined first axis as the center of rotation.

Further, in the non-circular hole machining method, in order to prevent the blade belly 25 of the cutting tool 17 from interfering with the wall surface 27 of the non-circular hole 30, the cutting tool 17 is synchronized with the rotation of the workpiece 19. The axial direction of the predetermined second axis is moved in the axial direction of the predetermined third axis, and the wall surface 27 of the cavity 7 is cut by the cutting tool 17 (see FIGS. 5 and 6).

Further, the first axis is formed as an axis (for example, the Z axis) of the central axis of the hole 30 having a non-circular shape, and the second axis is oriented in a predetermined direction different from the axial direction of the first axis (for example, with the Z axis) a shaft extending in an orthogonal predetermined direction (for example, an X-axis), and the third axis is oriented in a predetermined direction different from the axial direction of the first axis and the axial direction of the second axis (for example, with the Z-axis and the X-axis) The axis (for example, the Y axis) in which the axis extends in a predetermined orthogonal direction, and the first axis to the third axis are formed in a Cartesian coordinate system.

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

The cutting by the cutting tool 17 is performed by binary cutting such as a rotary disk. When the oblique angle at the time of cutting processing is a positive value, the edge angle of the cutting tool 17 is formed to be smaller than 90°.

Further, although the non-circular shape hole 30 formed by the cutting process is formed as a part of the cavity 7, the entirety of the non-circular shape hole 30 may be formed as the cavity 7.

The shape of the wall surface 27 of the non-circular shape of the hole 30 is formed into a side shape of a D-shaped columnar solid (non-cylindrical solid). The D-shaped columnar standing system refers to a three-dimensional (for example, a bulky three-dimensional) shape of one side obtained by cutting a column into two parts in a plane parallel to its central axis. The central axis of the D-shaped columnar solid (the central axis of the cylinder before cutting) is identical to the Z-axis.

When the cutting process is performed, the workpiece 19 is rotated in a predetermined direction (one direction) with the Z axis as the center of rotation.

Further, when the cutting process is performed, a planar side surface (planar portion) of the side surface of the D-shaped columnar (non-cylindrical solid) (the wall surface 27 of the non-circular hole 30) is started (assuming that the cutting has been performed) In the cutting surface 29 of the above-described cutting, the cutting process is performed (see FIG. 5(b)) to the end of the planar portion 29 on the side surface of the D-shaped columnar solid (refer to FIG. 5(d)). When the workpiece 19 is rotated by only a predetermined angle (see Fig. 6(c)), the coordinate value of the Y-axis of the cutting edge 31 of the cutting tool 17 is gradually increased from "0". After returning to the maximum value, the value returns to "0", and the coordinate value of the X-axis of the cutting edge 31 of the cutting tool 17 is gradually reduced from the "radius value r of the columnar solid angle D" to the minimum value, and then returned to "D". The radius value r" of the columnar solid.

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

5 and 6 show a spindle table in which a workpiece 19 is placed on a rotary disk (not shown) in order to process a D-shaped columnar hole (a non-circular hole) 30 in the workpiece 19 . The state is a state in which the state is viewed from the tailstock side toward the Z-axis direction of the spindle head side. In the fifth and sixth figures, the workpiece 19 is formed to rotate clockwise around the Z axis. The cutting tool 17 is provided in the holder, and the holder is formed to be freely movable in the X-axis direction and the Y-axis direction.

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

When the processed body 19 is rotated from the angle shown in Fig. 5(a) When the degree is "0°" and the rotation angle is "(180 ° - α °) / 2", the state shown in Fig. 5 (b) is formed. Further, between the state shown in Fig. 5(a) and the state shown in Fig. 5(b), the coordinate value of the cutting edge 31 is maintained at the value shown in Fig. 5(a), and The arcuate portion 33 of the side surface of the D-shaped columnar solid is subjected to cutting. In the state shown in Fig. 5(b), the planar portion 29 of the wall surface 27 of the D-shaped columnar hole 30 is processed.

Further, by rotating the workpiece 19 from the state shown in Fig. 5(b), the state shown in Fig. 5(c) is formed. The rotation angle θ of the workpiece 19 in the state shown in Fig. 5(c) is a value in the range of "(180 ° - α °) / 2 < θ < 90 °". Further, in the state shown in Fig. 5(c), the planar portion 29 on the side surface of the D-shaped columnar solid is cut. Further, by rotating the workpiece 19 from the state shown in Fig. 5(c), the state shown in Fig. 5(d) is formed.

Further, in the state shown in Fig. 5(c), the value of the X coordinate of the cutting edge 31 of the cutting tool 17 gradually decreases from "r" to a minimum value (a value smaller than the notch width B). After the smaller minimum value), it gradually increases until it is formed in the state shown in FIG. 5(d) (being formed as the value of the notch width B). Further, in the state shown in Fig. 5(c), 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. 5(d). .

In the state shown in Fig. 5(d), the rotation angle θ of the workpiece 19 is set to "90°". In the state shown in Fig. 5(d), the planar portion 29 of the wall surface 27 of the D-shaped columnar hole 30 is finished. Further, in the state shown in Fig. 5(d), 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 formed. It is "(r ² -B ² ) ^1/2 ".

Further, by rotating the workpiece 19 from the state shown in FIG. 5(d), the state shown in FIGS. 6(a) and (b) is formed. The rotation angle θ of the workpiece 19 in the state shown in (a) and (b) of FIG. 6 is formed as a value in the range of "90° < θ < 180 °". Further, in the state shown in (a) and (b) of Fig. 6, the arc-shaped portion 33 on the side surface of the D-shaped columnar solid is cut. Further, by rotating the workpiece 19 from the state shown in Figs. 6(a) and 6(b), the state shown in Fig. 6(c) is formed. In the state shown in Fig. 6(c), the planar portion 29 is formed to be parallel to the X-axis.

Further, in the state shown in Figs. 6(a) and 6(b), the value of the X coordinate of the cutting edge 31 of the cutting tool 17 gradually increases from "B" until it is formed as Fig. 6(c). The state shown in the figure is formed as "r" in the state shown in Fig. 6(c). Further, in the state shown in (a) and (b) of Fig. 6, the value of the Y coordinate of the cutting edge 31 of the cutting tool 17 gradually decreases from "(r ² - B ² ) ^1/2 " until In the state shown in Fig. 6(c), it is formed as "0" in the state shown in Fig. 6(c).

By further processing the processed body 19 from Fig. 6(c) When the state shown is rotated, it will be formed in the state shown in Fig. 5 (a). Further, between the state shown in Fig. 6(c) and the state shown in Fig. 5(a), the coordinate value of the cutting edge 31 is maintained at the value shown in Fig. 6(c). The arcuate portion 33 of the side surface of the D-shaped columnar solid is subjected to cutting.

5, (b), 5 (c), 5 (d), 6 (a), 6 (b), and (b), from the state shown in Fig. 5(a). (Fig. 6(c), returning to the state shown in Fig. 5(a), the machining of the workpiece 19 is performed by one rotation. In the actual machining, the following effects are generated: for example, the X-axis coordinate value and the Y-axis coordinate value gradually become larger as the workpiece 19 is rotated by a plurality of turns, so that the cutting tool 17 will have a D-shaped columnar shape. The diameter of the hole 30 is made larger. Further, the cutting tool 17 can be appropriately moved in the Z-axis direction to make the depth of the D-shaped columnar hole 30 deeper.

When the above cutting conditions are exemplified, the cutting speed is 1 m/min, the cutting amount is rough processing, and the final processing is 0.01 mm, and the feeding amount is 0.02 mm/rev for rough machining, and the final processing is 0.005 mm/ Rev.

Further, when the cutting tool 17 is in a state of the prior art that does not move in the Y-axis direction, as shown in Figs. 7 and 8, the step of cutting the D-shaped columnar hole 30 is halfway. The blade belly 25 of the cutting tool 17 interferes with the wall surface 27 (planar portion 29) of the D-shaped column-shaped hole 30 (in particular, Fig. 8 (a), (b)).

Non-circular apertures in accordance with embodiments of the present invention In the processing method, the non-circular hole 30 is cut by moving the cutting tool 17 in the axial direction of the X-axis and the axial direction of the Y-axis while rotating the workpiece 19 while rotating the Z-axis. Since the blade belly 25 of the cutting tool 17 can be prevented from interfering with the side surface of the non-circular hole 30, it is possible to prevent the blade belly 25 of the cutting tool 17 from interfering with the non-circular hole 30.

Further, in order to avoid the above-described interference, the cutting angle of the cutting tool 17 can be made small, and the clearance angle of the cutting process can be made large. However, if the blade angle is made smaller, there is a case where the following is caused: The rigidity of the cutting tool 17 is lowered to cause disadvantages such as breakage of the blade edge. However, since the cutting angle of the cutting tool 17 is not made small in the processing method of the non-circular hole disclosed in the embodiment of the present invention, it is not necessary to use a special-shaped cutting tool, but is generally used. The cutting tool (the cutting tool is not required to be exchanged as one cutting tool), and the replacement of the workpiece 19 is not required, that is, the so-called one-time clamping can be used to form a non-circular hole with high precision. 30 (planar portion 29) and does not reduce mass productivity. Further, since the portions 21 and 23 of the cavity 7 can be processed by the primary chucking, the position of the flange portion 11 with respect to the functional region 9 can be made the correct position in the lens 1.

In the above description, the D-shaped columnar hole 30 will be described. However, the cutting edge 31 of the cutting tool 17 may be appropriately moved to form a non-circular shape other than the D-shaped column. Hole. For example, it may be processed into a hole having an elliptical column shape or a long columnar hole, or a part of a circular arc of the circle may be cut off by two straight lines to have a flat shape. a flat portion, and the width of the two straight lines is shorter than the diameter of the circular arc so that the circular arc and the straight line have an edge shape (for example, a barrel shape), or the planar portion is set to three or more with respect to the center of the hole. The holes formed at the plural positions and the positions where the circumferences of the holes are equally distributed, and the holes formed by the straight lines (for example, triangular columnar holes, quadrangular columnar holes, pentagonal columnar holes) Multi-angle columnar hole).

Moreover, as a processing apparatus which implements the processing method of the non-circular hole disclosed by embodiment of this invention, the processing apparatus shown below is mentioned.

The processing device (not shown) is a processing device (for example, a rotary disk) that forms a non-circular hole in a non-circular hole in a workpiece by cutting using a cutting tool.

In addition, the processing apparatus includes a base body (machine tool), a workpiece mounting unit (subject to be processed body: a spindle head), and is integrally formed with the workpiece and is predetermined first. a shaft (an axis formed as a central axis of a hole having a non-circular shape: for example, a Z-axis) rotates the set object to be processed as a center of rotation; a tool setting portion (tool setting body; tool holder), and the aforementioned cutting tool It is provided integrally, and the cutting tool after the installation can be freely oriented in the axial direction of the second axis (for example, the X axis orthogonal to the Z axis) that is different from the axial direction of the first axis, and the first The axial direction of the axis and the axial direction of the second axis are moved in the axial direction of the third axis (for example, the Y axis) to perform positioning; and the control unit moves the tool setting portion and performs the cutting process. The object to be processed portion is rotated to cause the cutting tool to face the aforementioned The axial direction of the second shaft moves in the axial direction of the third shaft, and interference between the blade edge of the cutting tool and the wall surface of the non-circular hole can be avoided.

The workpiece installation portion is a rotation center with respect to the first axis of the susceptor system, and is rotatably formed by an actuator such as a servo motor. Further, a clamp portion for fixing the workpiece is provided in the workpiece installation portion.

Explain the movement positioning of the tool setting section. The processing device for the non-circular hole is provided with a first tool setting portion support and a second tool setting portion support. The first tool setting portion support system is engageable with the base body so as to be freely movable in the axial direction of the first shaft, and is formed by an actuator such as a servo motor so as to be freely movable toward the base body in the axial direction of the first shaft. mobile.

The second tool setting portion support system is engageable with the first tool setting portion support body so as to be freely movable in the axial direction of the second shaft, and is formed in the axial direction of the second shaft by an actuator such as a servo motor. The first tool setting portion support body is free to move.

The tool setting portion is engageable with the second tool setting portion support body so as to be freely movable in the axial direction of the third shaft, and is formed by an actuator such as a servo motor so as to be movable toward the second tool in the axial direction of the third shaft. The setting portion support is free to move. As described above, the cutting tool provided in the tool setting body is configured to be movable in the axial direction of the first shaft, the axial direction of the second axis, and the axial direction of the third axis toward the base body. .

The control unit is configured to have the following components: the input is The input unit of the machining data of the workpiece, and the memory and the CPU that store the machining program of the workpiece.

Further, the cutting machining data input from the input unit is appropriately controlled by the machining program by rotating the actuator of the workpiece mounting portion and moving the tool setting portion in the axial direction of the first shaft to perform positioning. An actuator that moves the tool setting portion in the axial direction of the second shaft to perform positioning, and an actuator that moves the tool setting portion in the axial direction of the third shaft to perform positioning.

17‧‧‧Cutting tools

19‧‧‧Processed body (raw material)

25‧‧‧ cutting tool blade

27‧‧‧Walls of non-circular holes

29‧‧‧ Non-cylindrical, three-dimensional planar side (non-cylindrical three-dimensional planar part)

30‧‧‧Non-circular holes (D-column holes)

31‧‧‧ cutting edge

33‧‧‧D-shaped cylindrical three-dimensional side arc-shaped part

B‧‧‧ gap width

r‧‧‧D-shaped columnar solid radius value

X-axis ‧‧‧2nd axis

Y axis ‧‧‧3rd axis

Z axis ‧‧‧1st axis

Claims (6)

A method for processing a non-circular hole is a non-circular hole machining method for forming a non-circular hole in a workpiece by cutting using a cutting tool, and is characterized in that: the first axis and the second axis are The first axis of the Cartesian coordinate system formed by the shaft and the third axis is a rotation center, and the cutting tool is moved in the axial direction of the second axis and the axial direction of the third axis while rotating the workpiece. By performing the above-described cutting process, it is possible to prevent the blade of the cutting tool from interfering with the wall surface of the non-circular hole. The method for processing a non-circular hole according to the first aspect of the invention, wherein the non-circular shape has a three-dimensional shape of a non-cylindrical shape having at least one planar side surface, and the first The shaft system is aligned 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, and the third axis and the first axis and the first When the two axes are orthogonal to the Y-axis, when the cutting process is performed, the workpiece is formed to rotate in a predetermined direction with the Z-axis as a rotation center, and the planar surface of the non-cylindrical shape is started from the beginning. The cutting value of the Y-axis of the cutting edge of the cutting tool is changed from the time of cutting to the end of the non-cylindrical three-dimensional planar side surface and the workpiece to be rotated by only a predetermined angle. 0" gradually increases to the maximum value and then returns to "0", and the X-axis seat of the cutting edge of the aforementioned cutting tool The scale value is gradually reduced from the "radius value of the non-cylindrical solid shape" to a minimum value, and then returned to the "radius value of the aforementioned non-cylindrical solid shape". The method for processing a non-circular hole according to the second aspect of the invention, wherein the non-cylindrical solid is a D-shaped columnar solid. The method for processing a non-circular hole according to the third aspect of the invention, wherein the object to be processed is a raw material of a mold. A lens characterized by being molded by a mold produced by a method of processing non-circular holes described in claim 4 of the patent application. A processing device for a non-circular hole is a processing device for forming a non-circular hole of a non-circular hole in a workpiece by cutting using a cutting tool, and is characterized in that: a portion to be processed is provided Providing the workpiece to be processed, and rotating the set workpiece by using the first axis of the Cartesian coordinate system formed by the first axis, the second axis, and the third axis as a rotation center; and the tool setting portion for the aforementioned The cutting tool is provided and the positioning tool can be freely moved in the axial direction of the second axis and the axial direction of the third axis to perform positioning; and the control unit moves the tool setting portion and processes the aforementioned tool The rotation of the body installation portion causes the cutting tool to move in the axial direction of the second axis and the axial direction of the third axis, thereby preventing interference between the blade edge of the cutting tool and the wall surface of the non-circular hole.