CN-121986004-A - Method for manufacturing mold for molding reflector, method for manufacturing reflector, and cutting tool

Abstract

The method for manufacturing a mold for molding a reflector that reflects light includes a cutting step of forming a plurality of concave portions in an inner surface of the mold by cutting, thereby forming irregularities in a reflecting surface of the reflector. The cutting step includes a planing step of cutting the plurality of concave portions by relative movement of the tool with respect to the die without accompanying rotation and vibration of the tool.

Inventors

• FUKUTA MASAHIKO
• Bizo Liao Tai
• KEISUKE NAGASAKA

Assignees

• 芝浦机械株式会社

Dates

Publication Date

20260505

Application Date

20240910

Priority Date

20231006

Claims (15)

1. 1. A method for manufacturing a mold for molding a reflector, the mold for molding a reflector reflecting light, characterized in that, A cutting step of forming a plurality of concave portions on the inner surface of the mold by cutting, thereby forming concave-convex portions on the reflecting surface of the reflector, The cutting step includes a planing step of cutting the plurality of concave portions by relative movement of the tool with respect to the die without accompanying rotation and vibration of the tool.
2. 2. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, The tool has a cutting edge extending in a direction intersecting a centerline of the shank, When the two ends of the cutting edge are referred to as a first end and a second end, the first end is located at a shorter distance from the center line than the second end, The ridge line extending from the first end toward the shank side is inclined so as to be located closer to the shank side than to the second end side.
3. 3. The method for manufacturing a mold for molding a reflector according to claim 2, wherein, The first end is located at the center line, The ridge line is inclined so as to be farther from the center line as it is closer to the shank side.
4. 4. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, In the planing step, all surfaces of the plurality of concave portions are cut by the same cutting edge of the tool having a straight line shape.
5. 5. The method for manufacturing a mold for molding a reflector as claimed in claim 4, wherein, In each of the plurality of recesses, all corners of adjacent faces each other are cut by the first end of the cutting edge having the first end and the second end.
6. 6. The method for manufacturing a mold for molding a reflector as claimed in claim 5, wherein, The plurality of concave portions respectively have a first plane, a second plane and a third plane which are orthogonal to each other, The planing step has: A first step of relatively moving the cutting edge toward a formation scheduled position of the second plane, forming the first plane by the cutting edge, and forming a corner between the third plane and the first plane by the first end; A second step of relatively moving the cutting edge toward a predetermined position of formation of the third plane, forming the second plane by the cutting edge, and forming a corner between the first plane and the second plane by the first end after the first step; A third step of relatively moving the cutting edge toward the first plane, forming the third plane by the cutting edge, and forming a corner between the second plane and the third plane by the first end after the second step.
7. 7. The method for manufacturing a mold for molding a reflector as claimed in claim 4, wherein, The tool is mounted on a spindle of a processing machine capable of simultaneously controlling a straight 3-axis and a rotary 2-axis.
8. 8. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, The plurality of concave portions include two or more concave portions having different orientations of the optical axis.
9. 9. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, The plurality of recesses include two or more recesses having different areas of inner surfaces.
10. 10. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, The plurality of concave portions include two or more concave portions having different shapes from each other.
11. 11. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, The plurality of recesses includes two or more recesses arranged along a curved surface.
12. 12. The method for manufacturing a mold for molding a reflector according to claim 1, wherein, The orientation of the optical axes of the plurality of recesses is random.
13. 13. A method for manufacturing a reflector, the reflector being molded using the mold manufactured by the method for manufacturing a mold for molding a reflector according to claim 1.
14. 14. A method for manufacturing a reflector for reflecting light, characterized in that, A cutting step of forming a plurality of concave portions constituting a reflecting surface of the reflector by cutting, The cutting step has a planing step of cutting the plurality of concave portions by relative movement of the tool with respect to the reflector without accompanying rotation and vibration of the tool.
15. 15. A cutting tool, characterized in that, Has a cutting edge extending in a direction intersecting the centerline of the shank, When the two ends of the cutting edge are referred to as a first end and a second end, the first end is located at a shorter distance from the center line than the second end, The ridge line extending from the first end toward the shank side is inclined so as to be located closer to the shank side than to the second end side.

Description

Method for manufacturing mold for molding reflector, method for manufacturing reflector, and cutting tool Technical Field The present disclosure relates to a method of manufacturing a mold for molding a reflector, a method of manufacturing a reflector, and a cutting tool. Background As a reflector for reflecting light, a reflector having irregularities on a reflecting surface is known. Specific examples thereof include a retro-reflector (hereinafter, the retro-reflector is sometimes referred to as "RR") provided in the rear of an automobile and reflecting light from another automobile. Such a reflector is molded by filling a mold with a molding material (e.g., resin), for example. Patent documents 1 to 3 disclose techniques for forming irregularities of a mold corresponding to irregularities of RR or similar irregularities by cutting with a cutter. Patent document 1 discloses a technique for cutting a concave portion of a die with a tool having a round tip. Although not explicitly described in patent document 1, the tool is used by rotating around the axis with reference to the shape and technical knowledge of the tool shown in the drawing. Patent document 2 discloses a technique of cutting a concave portion of a die by vibrating a tool. Patent document 3 discloses a technique of cutting a concave portion using a tool having a cutting edge located at a center line. The tool is rotated or vibrated for use. Patent document 1 and patent document 2 also disclose molds in which irregularities are formed on curved surfaces. Prior art literature Patent literature Patent document 1 (Japanese patent application laid-open No. 2012-108213) Patent document 2 (Japanese patent application) JP-A2013-202750 Patent document 3 (Japanese patent application laid-open No. 2022-87422) Disclosure of Invention Technical problem to be solved by the invention There has been a demand for a method for manufacturing a mold for molding a reflector, a method for manufacturing a reflector, and a cutting tool, which can improve the simplicity and/or accuracy of forming a concave-convex structure by cutting. Technical scheme for solving technical problems The method for manufacturing a mold for molding a reflector of an embodiment of the present disclosure is a method for molding a reflector that reflects light, wherein the method includes a cutting step of forming a plurality of concave portions on an inner surface of the mold by cutting, thereby forming irregularities on a reflecting surface of the reflector, wherein the cutting step includes a shaving step of cutting the plurality of concave portions by relative movement of the tool with respect to the mold without accompanying rotation and vibration of the tool. A method for manufacturing a reflector according to an embodiment of the present disclosure molds the reflector using the mold manufactured by the method for manufacturing a mold for molding a reflector. A method of manufacturing a reflector according to an aspect of the present disclosure is a method of manufacturing a reflector that reflects light, wherein the method includes a cutting step of forming a plurality of concave portions constituting a reflecting surface of the reflector by cutting, the cutting step includes a shaving step of cutting the plurality of concave portions by relative movement of the cutter with respect to the reflector without accompanying rotation and vibration of the cutter. When both ends of the cutting edge are referred to as a first end and a second end, the distance from the center line of the first end is shorter than the distance from the center line of the second end, and a ridge line extending from the first end toward the shank side is inclined so as to be located closer to the shank side than to the second end side. Effects of the invention According to the above steps and structure, in the manufacturing method of the mold for molding the reflector and the manufacturing method of the reflector, the ease and/or accuracy of forming the irregularities are improved. Drawings Fig. 1 is a plan view showing an example of the shape of the reflecting surface of the reflector. Fig. 2 is a cross-sectional view showing an example of a method for manufacturing a reflector. Fig. 3 is a perspective view showing an example of a processing machine for manufacturing the reflector molding die used in the manufacturing method of fig. 2. Fig. 4 is a side view showing an example of a tool attached to the processing machine of fig. 3. Fig. 5 is a perspective view showing an example of the blade portion of the tool of fig. 4. Fig. 6 is a side view showing an example of the blade of the edge portion of fig. 5. Fig. 7 is a perspective view showing an example of a cutting method using the insert of fig. 6. Fig. 8 is a perspective view showing an example of the procedure when three planes of RR are formed by the cutting method of fig. 7. Fig. 9 is a view showing a first example of the concave-convex shape of the mold f