Single crystal milling cutter for processing light guide plate

Abstract

This invention discloses a single-crystal end mill for processing light guide plates, comprising a shank and a cutting section disposed at one end of the shank. The cutting section includes a core and two inserts. The core is coaxially connected to the shank and is a quadrangular prism with a parallelogram cross-section. The angle between the short and long sides of the parallelogram is 70 degrees. The two inserts are respectively embedded on the outer surface of one side of the short side of the core. The cutting edges of the two inserts are parallel to the central axis. One end of the insert is flush with one long side of the core, and the other end protrudes beyond the other long side of the core. The rake angle of the insert is 35 degrees. The insert has a first clearance angle, a second clearance angle, and a third clearance angle sequentially arranged from the cutting edge inwards. The first clearance angle is 1 to 1.4 degrees, the second clearance angle is 28 degrees, and the third clearance angle is 32 degrees. The insert is made of single-crystal diamond. This invention has the advantages of reasonable and reliable structure, long service life, high processing efficiency, low product scrap rate, and ensuring smooth processing of light guide plates.

Description

Technical Field

[0001] This invention belongs to the field of machining tool technology, and in particular relates to a single-crystal end mill for machining light guide plates. Background Technology

[0002] With the development and progress of science, electronic products are becoming increasingly popular, making the processing of light guide plates a crucial link in this industry. The quality of the light guide plate itself determines the display effect and lifespan of the electronic display screen. Currently, a common problem in this industry is low processing efficiency and high scrap rate. This is because the characteristics of the light guide plate material itself determine the difficulty of processing, and phenomena such as edge chipping and breakage are prone to occur during processing, resulting in a scrap rate of up to 8%, causing enormous cost pressure and significantly reducing processing efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a single-crystal end mill with a reasonable and reliable structure, long service life, high processing efficiency, low product scrap rate, and the ability to ensure smooth machining of light guide plates.

[0004] To achieve the above objectives, the present invention provides a single-crystal end mill for processing light guide plates, comprising a shank and a cutting section disposed at one end of the shank. The cutting section includes a core and two inserts. The core is coaxially connected to the shank and is a quadrangular prism with a parallelogram cross-section. The angle between the short side and the long side of the parallelogram is 70 degrees. The two inserts are respectively embedded on the outer surface of one side of the short side of the core. The cutting edges of the two inserts are parallel to the central axis. One end of each insert is flush with one long side of the core, and the other end of each insert protrudes beyond the other long side of the core. The rake angle of each insert is 35 degrees. The insert has a first clearance angle, a second clearance angle, and a third clearance angle sequentially arranged from the cutting edge inwards. The first clearance angle is 1 to 1.4 degrees, the second clearance angle is 28 degrees, and the third clearance angle is 32 degrees. The insert is made of single-crystal diamond.

[0005] As a preferred embodiment of the present invention, the width of the flank face corresponding to the first clearance angle is 0.08mm to 0.11mm; and the width of the flank face corresponding to the second clearance angle is 1mm to 1.2mm.

[0006] As a preferred embodiment of the present invention, the length of the line connecting the cutting edges of the two blades on a plane perpendicular to the central axis is 6.0 mm.

[0007] As a preferred embodiment of the present invention, both blades are axially higher than the end face of the blade core.

[0008] As a preferred embodiment of the present invention, the blade length is greater than 4 mm.

[0009] As a preferred embodiment of the present invention, the length of the blade extending axially above the end face of the blade core is 0.5 mm.

[0010] As a preferred embodiment of the present invention, the height between the two long sides of the blade core is 2.2 mm, and the diagonal length of the two acute angles of the blade core is 4.9 mm.

[0011] As a preferred embodiment of the present invention, the knife handle includes a first knife handle and a second knife handle coaxially connected, the knife core is coaxially connected to the end of the second knife handle, the length of the first knife handle is 31mm, the diameter of the first knife handle is 6mm, the length of the second knife handle is 10mm, and the diameter of the second knife handle is 4.9mm.

[0012] As a preferred embodiment of the present invention, a first transition cone is provided at the end where the first tool holder is connected to the second tool holder, and the taper of the first transition cone is 30 degrees.

[0013] As a preferred embodiment of the present invention, the end of the second tool holder connected to the tool core is provided with a second transition cone, the taper of the second transition cone being 90 degrees.

[0014] The single-crystal end mill for processing light guide plates provided by this invention has the following advantages compared with the prior art:

[0015] (1) The present invention adopts a double-edged structure, which improves tool life and processing efficiency, and has good dynamic balance performance and small tool deviation, which can better meet the processing requirements of speeds up to 80,000 to 90,000 revolutions per hour.

[0016] (2) The present invention designs the front angle of the blade to be 35 degrees, which satisfies the material properties of the light guide plate itself and ensures the sharpness of the cutting edge, so that there will be no burrs or chipping during the cutting process, resulting in good processing effect and low product scrap rate.

[0017] (3) The present invention adopts a design with three clearance angles, namely, a first clearance angle of 1 degree to 1.4 degrees, a second clearance angle of 28 degrees and a third clearance angle of 32 degrees from the cutting edge inward. This structure can ensure that the tool has sufficient rigidity, while providing sufficient clearance space for the tool, reducing the contact area between the back face and the machined surface on the workpiece, which is beneficial to the cutting edge entry.

[0018] (4) Because the blade is made of single-crystal diamond, it has a high cost performance and long life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0020] Figure 1This is a front view of a single-crystal milling cutter for processing light guide plates provided by the present invention;

[0021] Figure 2 This is a side view of a single-crystal milling cutter for processing light guide plates provided by the present invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the machine or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0024] like Figure 1 As shown, a preferred embodiment of the present invention provides a single-crystal end mill for processing light guide plates, comprising a shank 1 and a cutting section disposed at one end of the shank 1. The cutting section includes a core 2 and two inserts 3. The core 2 is coaxially connected to the shank 1. The core 2 is a quadrangular prism with a parallelogram cross-section. The angle between the short side and the long side of the parallelogram is 70 degrees. The two inserts 3 are respectively embedded on the outer surface of one side of the short side of the core 2. The cutting edges of the two inserts 3 are parallel to the central axis O. One end of the insert 3 is flush with one side of the long side of the core 2, and the other end of the insert 3 protrudes beyond the other side of the core 2. The rake angle of the insert 3 is 35 degrees. The insert 3 has a first clearance angle α1, a second clearance angle α2, and a third clearance angle α3 sequentially arranged from the cutting edge inwards. The first clearance angle α1 is 1 degree to 1.4 degrees, the second clearance angle α2 is 28 degrees, and the third clearance angle α3 is 32 degrees. The insert 3 is made of single-crystal diamond.

[0025] Therefore, the key to implementing the single-crystal end mill for processing light guide plates provided in the embodiments of the present invention lies in:

[0026] (1) This embodiment adopts a double-edged structure, which improves tool life and processing efficiency, and has good dynamic balance performance and small tool deviation, which can better meet the processing requirements of speeds up to 80,000 to 90,000 revolutions per hour.

[0027] (2) In this embodiment, the front angle of the blade 3 is designed to be 35 degrees, which satisfies the material properties of the light guide plate itself and ensures the sharpness of the cutting edge, so that there will be no burrs or chipping during the cutting process, resulting in good processing effect and low product scrap rate.

[0028] (3) This embodiment adopts a design with three clearance angles, namely, a first clearance angle of 1 degree to 1.4 degrees, a second clearance angle of 28 degrees and a third clearance angle of 32 degrees from the cutting edge inward. This structure can ensure that the tool has sufficient rigidity, while providing sufficient clearance space for the tool, reducing the contact area between the back face and the machined surface on the workpiece, which is beneficial to the cutting edge entry.

[0029] (4) Because the material of blade 3 is single crystal diamond, it has a high cost performance and long life.

[0030] For example, the width H1 of the flank face corresponding to the first clearance angle α1 is 0.08mm to 0.11mm; the width H2 of the flank face corresponding to the second clearance angle α2 is 1mm to 1.2mm. This design ensures the tool's service life under normal cutting conditions, while also giving the tool sufficient wear resistance and cutting force.

[0031] For example, the length of the line connecting the cutting edges of the two blades 3 on a plane perpendicular to the central axis O (that is, the circumferential cutting diameter D0 formed by the two blades 3) is 6.0 mm.

[0032] For example, both blades 3 extend axially above the end face of the core 2. Specifically, the blade length L0 of the blade 3 is greater than 4 mm, and the length L1 of the blade 3 extending axially above the end face of the core 2 is 0.5 mm.

[0033] For example, the height between the two long sides of the blade core 2 is 2.2mm, and the diagonal length of the two acute angles of the blade core 2 is 4.9mm. Its structure is reasonable and reliable, and it is convenient to weld and fix the blade 3.

[0034] For example, to better adapt to the processing of the light guide plate, the tool holder 1 includes a first tool holder 11 and a second tool holder 12 coaxially connected. The cutting core 2 is coaxially connected to the end of the second tool holder 12. The length L2 of the first tool holder 11 is 31 mm, and the diameter D1 of the first tool holder 11 is 6 mm. The length L3 of the second tool holder 12 is 10 mm, and the diameter D2 of the second tool holder 12 is 4.9 mm. The end of the first tool holder 11 connected to the second tool holder 12 is provided with a first transition cone 13 having a vibration damping function, and the taper of the first transition cone 13 is 30 degrees. The end of the second tool holder 12 connected to the cutting core 2 is provided with a second transition cone 14 having a vibration damping function, and the taper of the second transition cone 14 is 90 degrees.

[0035] It should be noted that because the machining speed of this tool is very high, the insert 3 and the core 2 are vacuum welded together, and the welding time is adjusted to ensure that the tool is firmly welded. In addition, the runout requirements of the two inserts 3 are very strict, and the runout is required to be within 0.01mm during the design.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A single-crystal end mill for processing light guide plates, comprising a shank and a cutting portion disposed at one end of the shank, characterized in that, The cutting part includes a cutting core and two blades. The cutting core is coaxially connected to the tool holder. The cutting core is a quadrangular prism with a parallelogram cross-section. The angle between the short side and the long side of the parallelogram is 70 degrees. The height between the two long sides of the cutting core is 2.2 mm. The diagonal length of the two acute angles of the cutting core is 4.9 mm. The two blades are respectively embedded on the outer surface of one side of the short side of the cutting core. The cutting edges of the two blades are parallel to the central axis. One end of each blade is flush with one long side of the cutting core, and the other end of each blade protrudes beyond the central axis. On the other long side of the cutting core, the rake angle of the blade is 35 degrees. The blade has a first clearance angle, a second clearance angle, and a third clearance angle in sequence from the cutting edge inwards. The first clearance angle is 1 degree to 1.4 degrees, the second clearance angle is 28 degrees, and the third clearance angle is 32 degrees. The width of the flank face corresponding to the first clearance angle is 0.08 mm to 0.11 mm; the width of the flank face corresponding to the second clearance angle is 1 mm to 1.2 mm. The length of the line connecting the cutting edges of the two blades on a plane perpendicular to the central axis is 6.0 mm. The blade is made of single-crystal diamond. Both blades extend axially above the end face of the blade core; The blade has a cutting length greater than 4 mm.

2. The single-crystal milling cutter for processing light guide plates according to claim 1, characterized in that, The blade extends 0.5 mm axially above the end face of the blade core.

3. A single-crystal end mill for processing light guide plates according to any one of claims 1 to 2, characterized in that, The knife handle includes a first knife handle and a second knife handle connected coaxially. The knife core is coaxially connected to the end of the second knife handle. The length of the first knife handle is 31mm and the diameter of the first knife handle is 6mm. The length of the second knife handle is 10mm and the diameter of the second knife handle is 4.9mm.

4. A single-crystal milling cutter for processing light guide plates according to claim 3, characterized in that, The first tool holder is provided with a first transition cone at the end where it connects to the second tool holder, and the taper of the first transition cone is 30 degrees.

5. A single-crystal milling cutter for processing light guide plates according to claim 3, characterized in that, The second tool holder is provided with a second transition cone at the end where it is connected to the tool core, and the taper of the second transition cone is 90 degrees.

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