CN115780910A - Engraving method of triangular-cone retroreflection mold - Google Patents
Engraving method of triangular-cone retroreflection mold Download PDFInfo
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- CN115780910A CN115780910A CN202211547097.9A CN202211547097A CN115780910A CN 115780910 A CN115780910 A CN 115780910A CN 202211547097 A CN202211547097 A CN 202211547097A CN 115780910 A CN115780910 A CN 115780910A
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Abstract
The invention discloses a method for engraving a triangular-cone retro-reflection mold. Wherein the method comprises the following steps: providing a metal plate, wherein the metal plate comprises a smooth surface; cleaning the smooth surface; and arranging a cutter with a cutter point angle of 70.2-70.8 degrees above the smooth surface along a first direction, rotating the cutter in a second direction by 0-0.6 degrees by taking the cutter point of the cutter as a base point after the arrangement is finished, engraving the smooth surface along a preset route by using the rotated cutter, and processing a triangular pyramid retroreflection array with the side length of 215-219 mu m and the height of 97-100 mu m by using the engraved metal plate. According to the size characteristics of the retroreflective array structure of the triangular pyramid, the sharp corner and the deflection angle of the cutter are designed; experimental results show that the triangular-cone retroreflective film meeting the V-type film standard can be prepared by using the mold prepared by the cutter angle.
Description
Technical Field
The invention relates to the technical field of triangular-cone retro-reflection mold processing, in particular to a method for engraving a triangular-cone retro-reflection mold.
Background
The triangular pyramid retroreflection film is a reflecting material prepared based on the refraction and total reflection principles of triangular pyramids, the surface finish of each triangular pyramid exceeds 5nm, the angle error is less than 0.01 arc second, 10000 microprisms are distributed in each square centimeter, and the reflecting material is a reflecting product completely realized by ultra-precise craftsman technology and process. Compared with a glass bead type triangular pyramid retroreflection film, the glass bead type triangular pyramid retroreflection film has a better light reflection effect, has a longer visible distance and a better recognition effect, and is generally used for road signs of high-grade highways.
However, the brightness of the existing domestic few triangular-pyramid retroreflective films rarely reaches the V-type standard, because the processing technology of the die and the design and development of the corner angle are difficult, and especially the matching of the cutter angle and the size of the microprism unit is difficult. Once the angle design of the cutter and the size of the matched microprism unit are wrong, a mold capable of preparing a V-type standard triangular pyramid retroreflective film cannot be prepared.
Disclosure of Invention
In view of this, the present invention provides a method for engraving a triangular-pyramidal retroreflective mold, which can implement the preparation of a V-type standard triangular-pyramidal retroreflective mold.
According to an aspect of the present invention, there is provided a method of engraving a triangular pyramidal retroreflective mold, comprising: providing a metal plate, wherein the metal plate comprises a smooth surface; cleaning the smooth surface; and arranging a cutter with a cutter point angle of 70.2-70.8 degrees above the smooth surface along a first direction, rotating 0-0.6 degrees along a second direction by taking the cutter point of the cutter as a base point after the arrangement is finished, engraving along a preset route on the smooth surface by using the rotated cutter, and processing a triangular cone retroreflection array with the side length of 215-219 mu m and the height of 97-100 mu m by using the engraved metal plate.
According to another aspect of the present invention, there is provided a triangular-pyramidal retroreflective film master mold engraved by the engraving method described above in a method of engraving a triangular-pyramidal retroreflective mold.
According to yet another aspect of the present invention, there is provided a working mold for a triangular pyramidal retroreflective film, which is produced by electroforming one of the above-described original molds for a triangular pyramidal retroreflective film.
According to still another aspect of the present invention, there is provided a triangular-pyramidal retroreflective film prepared by the method for engraving a triangular-pyramidal retroreflective mold as described above.
According to still another aspect of the present invention, there is provided a triangular pyramidal retroreflective film-processing tool having a tool tip angle of 70.2 ° to 70.8 ° and an angle of 0 ° to 0.6 ° with respect to a vertical direction after being mounted on a tool holder.
According to the scheme, the sharp corner and the deflection angle of the cutter are designed according to the size characteristics of the retroreflective array structure of the triangular pyramid; experimental results show that the triangular-cone retroreflective film meeting the V-type film standard can be prepared by using the mold prepared by the cutter angle. The die is made of copper, the copper has good heat-conducting property and is positioned in the third place in metal, meanwhile, the copper has good extensibility, is easy to form and process, and has good corrosion resistance. In the subsequent hot pressing process, heat can be quickly conducted to facilitate the forming of the triangular-cone retroreflective film. Meanwhile, the copper has good cutting processing performance and is easy to process the die.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of one embodiment of a method for engraving a triangular-pyramidal retroreflective mold of the present invention;
FIG. 2 is a schematic diagram of a tool for an embodiment of the method of engraving a triangular-pyramidal retroreflective mold of the present invention;
FIG. 3 is a schematic representation of the size of a triangular pyramid in a triangular pyramid retroreflective array;
FIG. 4 is a schematic view of an embodiment of a method for engraving a triangular-pyramidal retroreflective mold according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Likewise, the following examples are only some examples, not all examples, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The invention provides a method for engraving a triangular pyramid retro-reflecting mold, which can realize the preparation of a V-type standard triangular pyramid retro-reflecting mold.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating an embodiment of a method for engraving a triangular-pyramidal retroreflective mold according to the present invention. It should be noted that the method of the present invention is not limited to the flow sequence shown in fig. 1 if the results are substantially the same. As shown in fig. 1, the method comprises the steps of:
s101: a metal plate is provided, which includes a smooth surface.
S102: cleaning the smooth surface; and
s103: arranging a cutter with a cutter point angle of 70.2-70.8 degrees above the smooth surface along a first direction, rotating 0-0.6 degrees along a second direction by taking the cutter point of the cutter as a base point after the arrangement is finished, engraving the smooth surface along a preset route by using the rotated cutter, and processing a triangular pyramid retroreflection array with the side length of 215-219 mu m and the height of 97-100 mu m by using the engraved metal plate.
The method comprises the steps of arranging a cutter with a cutter point angle of alpha =70.4 degrees above the smooth surface C along a first direction A, rotating beta =0.4 degrees along a second direction B by taking the cutter point of the cutter as a base point after the arrangement is finished, utilizing the rotated cutter to carve a smooth surface along a preset route, and utilizing a carved metal plate to machine a triangular pyramid retroreflection array with the side length of 217 mu m and the height of 98 mu m.
In the present embodiment, please refer to fig. 2 for the tool tip angle α and the rotation angle β; please refer to fig. 3 for the size of the triangular pyramidal unit in the triangular pyramidal retroreflective array prepared by the mold prepared by the process; it should be further understood that the tool tip angle α and the angle of rotation β are found to be angles that allow chips to flow toward the surface to be machined during machining, preventing scratching of the machined surface and reducing nicks and impacts on the machined area. And the vibration amplitude at this angle was found to be minimal during machining. Vibrations in a typical machining process reduce the quality of the machined surface. The vibrations cause vibration waves in the machined surface, resulting in surface roughness which, especially in the case of the finishing of microprisms, is extremely fatal for the machining of the template. Meanwhile, relative displacement is generated between the workpiece and the cutter, the normal motion track is influenced, the processed surface can have the conditions of silk shape similar to wrinkling, fish scale shape and the like, the quality and the dimensional accuracy of the processed surface are reduced, and the conditions are extremely fatal to the processing of the template. Further, in the machining process, the machining of the copper plate at the angle is found to be minimum in vibration amplitude and highest in precision. Meanwhile, the vibration amplitude is minimum, the service life of the cutter is further prolonged, and continuous processing can be performed on a large-scale die. Meanwhile, the vibration amplitude is minimum, so that the production efficiency is further improved.
In this embodiment, referring to fig. 4, in S103, the rotating tool is used to perform engraving on a smooth surface along a predetermined route, specifically, the tool engraves a first groove on the smooth surface along a third direction D and resets; the cutter carves a second groove on a smooth surface along a 60-degree direction of a third direction and resets; the cutter carves a third groove on a smooth surface along a third direction, namely a 60-degree direction, and resets. And (4) repeating the steps until the smooth surface is carved with the triangular pyramid retroreflection array.
In the embodiment, an integral machining method of the triangular pyramid retroreflection array mold is adopted, the method enables a cutter to respectively cut three V-shaped grooves with three channels on a metal base body along three directions which mutually form an angle of 60 degrees, and the triangular pyramid retroreflection array is obtained. Meanwhile, the cutter angle process provided by the invention is suitable for an integral processing method and is not suitable for a needle number binding method and a sheet combination method. It can be appreciated that the present invention provides a process improvement to the overall process to facilitate the fabrication of molds in a cost effective manner.
In this embodiment, it should be understood that the angle of the cutter is designed according to the size of the triangular pyramid unit. That is to say, through the angle setting of the cutter, a triangular pyramid with side length of 217 μm and height of 98 μm can be correspondingly carved on the smooth surface of the die. It should be understood that the invention adopts ultra-precise five-axis machining equipment, which can ensure that the cutter machining process of the cutter angle is not influenced by other factors to machine a product. That is, if a device with insufficient precision is adopted, the invention cannot ensure that a mold meeting the V-type standard can be processed.
In this embodiment, it should be understood that the angle of the tool corresponds to the triangular pyramid with side length of 217 μm and height of 98 μm, and the processed triangular pyramid retroreflective mold can meet the processing standard of the V-type film. The preparation process of the triangular-cone retro-reflection original mold comprises the following steps: processing the triangular cone retroreflection array, chemically cleaning the triangular cone retroreflection array, vacuum evaporation of the triangular cone retroreflection array and the like. Wherein the purpose of the chemical cleaning and vacuum evaporation steps of the triangular pyramid retroreflective array is to further reduce the surface roughness value of the triangular pyramid retroreflective array.
In this embodiment, an ultra-precise five-axis machining apparatus is used, the dimensional accuracy of the triangular pyramid is 1 μm, the angular accuracy is 0.2 °, the surface roughness Ra < 20nm, and the maximum dimension of 200 × 200mm can be realized. It should be understood that the invention adopts ultra-precise five-axis machining equipment, which can ensure that the machining process of the cutter with the cutter angle is not influenced by other factors to machine a product. That is, if a device with insufficient precision is adopted, the invention cannot ensure that a mold meeting the V-type standard can be processed.
In this embodiment, the engraved metal plate is chemically cleaned and vacuum evaporated to form a triangular-cone retroreflective film mold; the triangular-cone retroreflective film mould is utilized to carry out hot pressing on the substrate layer, the triangular-cone retroreflective array substrate layer with the size of a single prism of 217 mu m of side length and 98 mu m of height is formed, and the triangular-cone retroreflective array substrate layer is processed to form the triangular-cone retroreflective film.
In this embodiment, this engraved metal plate is subjected to chemical cleaning, vacuum evaporation forms the former mould of the retro-reflective film of the triangular cone, and utilize this former mould to carry out electroforming and obtain the retro-reflective film working mould of the triangular cone, and utilize this retro-reflective film working mould of the triangular cone to carry out hot pressing to the substrate layer, form the retro-reflective array substrate layer of the triangular cone that single prism size is side length 217 μm, height 98 μm, and form the retro-reflective film of the triangular cone with the retro-reflective array substrate layer processing of this triangular cone.
In this embodiment, the base layer is a resin material.
It should be understood that the original mold of the triangular-pyramidal retroreflective film and the working mold of the triangular-pyramidal retroreflective film can be directly used for preparing the triangular-pyramidal retroreflective film. It is to be understood that the purpose of electroforming is to reduce tooling costs, but does not preclude the use of the original mold as a working mold.
In the present embodiment, the metal plate is made of elemental copper or brass. Copper has good heat conductivity, is in the third place in metal, has good extensibility, is easy to form and process, and has good corrosion resistance. In the subsequent hot pressing process, heat can be quickly conducted to form the triangular pyramid retroreflection film easily. Meanwhile, the copper has good cutting processing performance and is easy to process the die.
According to the size characteristics of the retroreflective array structure of the triangular pyramid, the sharp corner and the deflection angle of the cutter are designed; experimental results show that the triangular-cone retroreflective film meeting the V-type film standard can be prepared by using the mold prepared by the cutter angle. The die is made of copper, the copper has good heat-conducting property and is positioned in the third place in metal, meanwhile, the copper has good extensibility, is easy to form and process, and has better corrosion resistance. In the subsequent hot pressing process, heat can be quickly conducted to form the triangular pyramid retroreflection film easily. Meanwhile, the copper has good cutting processing performance and is easy to process the die
The present example was tested for a preferred embodiment of the tool with a tool tip angle of 70.2 ° -70.8 ° and an off-angle of 0 ° -0.6 °, with the same other factors. The test is carried out by using a measurement method defined by a JT2020 retroreflector photometric property test method, and the result is as follows:
preferred example 1:
preferred example 2:
the preferred example measurement sets the combination of viewing angle and incident angle as follows: 0.2 °/4 °, 0.2 °/15 °, 0.2 °/30 °, and 0.5 °/4 °, 0.5 °/15 °, 0.5 °/30 °, and 1 °/4 °, 1 °/15 °, 1 °/30 °.
In order to examine the observation angle performance of the cube-corner retroreflective sheet of the preferred embodiment, the retroreflective coefficient of the sample was measured by keeping the entrance angle at a constant value, which is not convenient for observing three angles. Of the two preferred embodiments, particularly preferred embodiment 2 is the most effective in technical effect and the most excellent in coefficient of retroreflection. It should be understood that the present embodiment uses an integral machining method of the triangular pyramid retroreflective array mold, which allows the tool to cut three V-shaped grooves with three channels on the metal substrate along three directions that are 60 ° to each other, so as to obtain the triangular pyramid retroreflective array, and the machining method has high machining efficiency. Meanwhile, the cutter angle process provided by the invention is suitable for an integral processing method and is not suitable for a needle number binding method and a sheet combination method. It can be appreciated that the present invention provides a process improvement to the overall process to facilitate the fabrication of molds in a cost effective manner. It should be understood that the invention adopts ultra-precise five-axis machining equipment, which can ensure that the machining process of the cutter with the cutter angle is not influenced by other factors to machine a product. That is to say, if the tool of the present invention is clamped by a device other than a five-axis machining device, the present invention cannot ensure that a mold meeting the V-type standard can be machined. It is understood that the angle selected in the above preferred embodiment is a preferred angle in the tool range of the knife point angle 70.2-70.8 ° and the offset angle 0-0.6 °. It should be understood that the present invention uses the tool angle as a basis to engrave the mold, and the mold can be engraved when the angle range is satisfied. It should also be understood that the tool limitations referred to herein are as follows:
(1) the material quality is as follows: a cemented carbide tool or polycrystalline diamond tool having a hardness greater than 91 HRC. Polycrystalline diamond cutters are preferred.
(2) The forming method of the cutter comprises the following steps: and (3) processing the sharp corner of the basic cutter by integral forming or matching the basic cutter with a nano grinding process.
The invention also provides a triangular-cone retro-reflective film original mold which is carved by the carving method in the carving method of the triangular-cone retro-reflective mold. The method for engraving the original mold has already been described above, and is not described herein again.
The invention also provides a working die of the triangular-cone retro-reflective film, which is manufactured by electroforming the original die of the triangular-cone retro-reflective film. The method for engraving the original mold has been described above, and will not be described herein.
The invention also provides a triangular-cone retro-reflecting film prepared by the engraving method of the triangular-cone retro-reflecting mold. The method for preparing the triangular-pyramidal retroreflective film has been described above, and will not be described herein.
The invention also provides a triangular-cone retro-reflection film processing cutter, and the sharp angle of the cutter is 70.2 DEG
-70.8 ° and the angle of the tool with the vertical is 0 ° -0.6 ° after the tool is mounted in the tool holder. The method of using the tool has been described above, and will not be described herein.
The method can be found out that the tool point angle and the deflection angle of the tool are designed according to the size characteristics of the triangular pyramid retroreflection array structure; experimental results show that the triangular-cone retroreflective film meeting the V-type film standard can be prepared by using the mold prepared by using the cutter angle. The die is made of copper, the copper has good heat-conducting property and is positioned in the third place in metal, meanwhile, the copper has good extensibility, is easy to form and process, and has better corrosion resistance. In the subsequent hot pressing process, heat can be quickly conducted to facilitate the forming of the triangular pyramid retroreflection film. Meanwhile, the copper has good cutting processing performance and is easy to process the die.
The above description is only a part of the embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the present invention through the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method of engraving a triangular pyramidal retroreflective mold, comprising:
providing a metal plate, wherein the metal plate comprises a smooth surface;
cleaning the smooth surface; and
arranging a cutter with a cutter sharp angle of 70.2-70.8 degrees above the smooth surface along a first direction, rotating 0-0.6 degrees along a second direction by taking the cutter point of the cutter as a base point after the arrangement is finished, engraving a smooth surface along a preset route by using the rotated cutter, and processing a triangular pyramid retroreflection array with the side length of 215-219 mu m and the height of 97-100 mu m by using the engraved metal plate.
2. The method of claim 1, wherein the engraving process is performed on a smooth surface along a predetermined path by using a rotating tool, and particularly,
the cutter carves a first groove on a smooth surface along a third direction and resets; the cutter carves a second groove on a smooth surface along a 60-degree direction of a third direction and resets; the cutter carves a third groove on a smooth surface along a-60-degree direction of a third direction and resets;
and shifting the cutter and repeating the steps until the carving is finished.
3. The method for engraving the triangular-pyramid retroreflective mold according to claim 1, wherein the method for processing the triangular-pyramid retroreflective array with side length of 215-219 μm and height of 97-100 μm by using the engraved metal plate comprises the following steps:
chemically cleaning the carved metal plate, and performing vacuum evaporation to form a triangular-cone retro-reflection film mold;
and hot-pressing the substrate layer by using the triangular-cone retroreflective film die to form the triangular-cone retroreflective array substrate layer with the single prism size of 217 mu m and the height of 98 mu m.
4. The method of claim 1, wherein the step of forming a retroreflective triangular pyramidal array having a side length of 215-219 μm and a height of 97-100 μm from an engraved metal plate comprises:
this carved metal sheet carries out chemical cleaning, vacuum evaporation forms the former mould of the contrary reflective membrane of triangle cone, and utilizes this former mould to carry out the electroforming and obtains the contrary reflective membrane working mould of triangle cone, and utilizes the contrary reflective membrane working mould of this triangle cone to carry out hot pressing to the substrate layer, forms the contrary reflective array substrate layer of the triangle cone that single prism size is side length 217 μm, height 98 μm, and with the contrary reflective array substrate layer processing of this triangle cone form the contrary reflective membrane of triangle cone.
5. The method of engraving a triangular-pyramidal retroreflective mold according to any one of claims 1-5,
the metal plate is made of elemental copper or brass.
6. A triangular-pyramidal retroreflective film master mold, which is obtained by engraving according to the engraving method of the triangular-pyramidal retroreflective mold according to claims 1 to 6.
7. A triangular pyramidal retroreflective sheeting working mold produced by electroforming a triangular pyramidal retroreflective sheeting master mold of claim 6.
8. A triangular-pyramidal retroreflective film produced by the method of engraving the triangular-pyramidal retroreflective mold according to claims 1 to 6.
9. A triangular-cone retroreflective film processing cutter is characterized in that the cutter point angle of the cutter is 70.2-70.8 degrees, and the included angle between the cutter and the vertical direction is 0-0.6 degrees after the cutter is arranged on a cutter rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211547097.9A CN115780910A (en) | 2022-12-05 | 2022-12-05 | Engraving method of triangular-cone retroreflection mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211547097.9A CN115780910A (en) | 2022-12-05 | 2022-12-05 | Engraving method of triangular-cone retroreflection mold |
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| CN115780910A true CN115780910A (en) | 2023-03-14 |
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| CN202211547097.9A Pending CN115780910A (en) | 2022-12-05 | 2022-12-05 | Engraving method of triangular-cone retroreflection mold |
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- 2022-12-05 CN CN202211547097.9A patent/CN115780910A/en active Pending
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