CN118288114A - Polishing method of aspherical mold - Google Patents
Polishing method of aspherical mold Download PDFInfo
- Publication number
- CN118288114A CN118288114A CN202410311627.2A CN202410311627A CN118288114A CN 118288114 A CN118288114 A CN 118288114A CN 202410311627 A CN202410311627 A CN 202410311627A CN 118288114 A CN118288114 A CN 118288114A
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- polishing
- shaft
- aspherical mold
- aspherical
- mold
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- 238000005498 polishing Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 22
- 239000010432 diamond Substances 0.000 claims abstract description 22
- 238000007517 polishing process Methods 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 235000019580 granularity Nutrition 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000011505 plaster Substances 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 101100366060 Caenorhabditis elegans snap-29 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention provides a polishing method of an aspherical mold, which comprises the following steps: clamping the aspherical mold on a precise polishing machine; the angle of the polishing shaft is controlled to be 5-10 degrees, the rotating speed is controlled to be 80-100rpm, the rotating speed of the workpiece shaft is controlled to be 80-100rmp, the rotating speeds of the polishing shaft and the workpiece shaft are kept consistent, and #1/2 diamond paste is adopted to carry out rough polishing on the aspherical mold from edge to center and then from edge to edge; the rotation speed of the polishing shaft is controlled to be 80-100rmp, the rotation speed of the workpiece shaft is controlled to be 80-100rmp, the rotation speeds of the polishing shaft and the workpiece shaft are kept consistent, and #1/4 diamond paste is adopted to finely polish the aspherical mold from edge to center and then from edge to edge. According to the invention, the rotation speed of the polishing shaft and the workpiece shaft and the angle of the polishing shaft are controlled, and diamond pastes with different granularities are adopted to sequentially perform rough polishing and fine polishing on the aspherical mold, so that the wheel line value of the aspherical mold is less than or equal to 25 nm.
Description
Technical Field
The invention belongs to the field of die surface polishing, and particularly relates to a method for polishing an aspherical die by using a precision polishing machine.
Background
Along with the increasingly wide application of the imaging field of the aspheric optical glass, the requirements on the appearance quality of the aspheric lens are higher and higher, and the surface polishing quality of the aspheric mold is correspondingly improved. While the low frequency errors on the mold surface are removed quickly, there is often a small ripple on the polished optical surface, also known as a mid-frequency error. The presence of errors in the optical elements reduces the resolution of the optical imaging system, and the resulting scattering causes significant energy loss, which greatly reduces the performance of the optical system, and therefore it is particularly important to control the mold's wheel line.
At present, the hardness of a tungsten carbide die commonly used for polishing an aspherical die is close to that of diamond, the processing and polishing difficulties are high, most of the manual polishing processes at present can deteriorate the surface wheel line of the die in the polishing process, and the wheel line value is usually more than 35nm, as shown in figure 1.
Disclosure of Invention
The invention aims to provide a polishing method of an aspherical mold with a wheel line value less than or equal to 25 nm.
The technical scheme adopted for solving the technical problems is as follows: a method of polishing an aspherical mold, the method comprising the steps of:
1) Clamping the aspherical mold on a precise polishing machine;
2) Controlling the angle of the polishing shaft to be 5-10 degrees, controlling the rotating speed of the polishing shaft to be 80-100rpm, controlling the rotating speed of the workpiece shaft to be 80-100rmp, keeping the rotating speeds of the polishing shaft and the workpiece shaft consistent, and performing rough polishing on the aspherical mold from edge to center to edge by adopting # 1/No. 2 diamond paste;
3) The rotation speed of the polishing shaft is controlled to be 80-100rmp, the rotation speed of the workpiece shaft is controlled to be 80-100rmp, the rotation speeds of the polishing shaft and the workpiece shaft are kept consistent, and #1/4 diamond paste is adopted to finely polish the aspherical mold from edge to center and then from edge to edge.
Further, the aspherical mold in the step 1) is an aspherical mold subjected to ultra-precise machining. After the aspherical mold is clamped on the precise polishing machine, the flatness of the aspherical mold is within 1 mu m, the concentricity of the aspherical mold is controlled within 1 mu m, and corresponding aspherical mold coefficients are established. The polishing head of the precision polishing machine adopts a polishing head with an R value of 5mm, and the polishing head is wrapped with polyurethane polishing cloth and then fixed. The precise polishing machine is a precise automatic polishing machine with an X axis, a B axis, a Z axis, a polishing axis and a workpiece axis.
Further, after the rough polishing in the step 2), the surface quality of the aspherical mold reaches 40-20. And 3) after the rough polishing, the surface quality of the aspherical mold reaches 20-10.
Further, in the step 2) and the step 3), the polishing paste and the polishing oil are mixed according to the weight ratio of 1:1 are mixed and uniformly smeared on the surface of the aspherical mould. The polishing head applies a load of 130-160g/cm 2 to the aspherical mold. The polishing time is set according to the size of the aspherical mold.
The beneficial effects of the invention are as follows: the rotation speed of the polishing shaft and the workpiece shaft and the angle of the polishing shaft are controlled, and diamond pastes with different granularities are adopted to sequentially perform rough polishing and fine polishing on the aspherical mold, so that the wheel line value of the aspherical mold is less than or equal to 25 nm.
Drawings
FIG. 1 is a graph of the current mold surface line data after manual polishing.
FIG. 2 is a graph of mold surface line data after polishing in example 1 of the present invention.
Detailed Description
The surface quality standards 60-40, 40-20, 20-10 described below are U.S. military standards, with the numbers indicating scratch permitted maximum values in the front and pitting permitted maximum values in the rear, see specifically U.S. military standard MILs-PRF-13830B for flaw criteria.
The polishing method of the aspherical mold comprises the following steps:
1) Preparation work before polishing: ensuring the normal working characteristics of the precise polishing machine and running in a hundred thousand-level clean room; mounting an ultra-precisely machined aspheric mold (tungsten carbide mold) on a working surface of a precise polishing machine, so that the flatness of the aspheric mold is within 1 mu m, the concentricity of the aspheric mold is controlled within 1 mu m, and corresponding aspheric mold coefficients are established;
the precise polishing machine adopts the existing precise automatic polishing machine with an X axis, a B axis, a Z axis, a polishing axis and a workpiece axis.
2) Controlling the angle of a polishing shaft to be 5-10 degrees, controlling the rotating speed of the polishing shaft to be 80-100rmp, controlling the rotating speed of a workpiece shaft to be 80-100rmp, keeping the rotating speeds of the polishing shaft and the workpiece shaft consistent, performing rough polishing on an aspherical mold from edge to center to edge by using # 1/No. 2 diamond paste, polishing until the surface quality reaches 40-20 or more, observing the surface of the aspherical mold under a 50-time microscope, and ensuring that no processing trace exists on the surface of the aspherical mold;
3) The rotation speed of a polishing shaft is controlled to be 80-100rmp, the rotation speed of a workpiece shaft is controlled to be 80-100rmp, the rotation speeds of the polishing shaft and the workpiece shaft are kept consistent, #1/4 diamond paste is adopted to polish the aspherical mold from edge to center and then from edge to edge, the surface quality reaches 20-10 or more, no scratch is generated on the surface of the aspherical mold when observed under a microscope of 50 times, and the polishing time is different according to the different sizes of the aspherical molds.
Polishing by the method of the present invention belongs to precision polishing, and must be performed in a clean space. When diamond paste is used for polishing, not only is the surface of the die required to be clean, but also the worker needs to wear fingerstall with both hands. Wherein, the polishing head is made of stainless steel 304, the R value of the polishing head is 5mm, and the polishing head is wrapped with polyurethane polishing cloth and then fixed. The polishing head applies a load of 130-160g/cm 2 to the aspherical mold. The weight ratio of the polishing paste to the polishing oil is 1:1 are mixed and uniformly smeared on the surface of the aspherical mould. The diamond plaster is a mixture of diamond fine particles and oily binder, the #1/2 diamond plaster represents the particle size, which is a mixture of diamond particles of 0.5 μm and binder, and the #1/4 diamond plaster represents the mixture of diamond particles of 0.25 μm and binder.
Example 1
The aspherical mould with the diameter phi 23 is polished by adopting the method.
Firstly, clamping an aspherical mold subjected to ultra-precise machining onto a workbench of a precise polishing machine, and simultaneously establishing corresponding aspherical mold coefficients;
then, the angle of a polishing shaft is controlled to be 10 degrees, the rotating speed of the polishing shaft is controlled to be 90rpm, the rotating speed of a workpiece shaft is controlled to be 90rmp, the #1/2 diamond paste is adopted to carry out rough polishing on the aspherical mold from edge to center and then from edge to edge, the polishing time is 11 minutes, no processing trace is observed on the surface of the aspherical mold under a microscope of 50 times after polishing, and the surface quality reaches 40-20;
And finally, controlling the rotation speed of the polishing shaft at 90rpm, controlling the rotation speed of the workpiece shaft at 90rmp, and adopting #1/4 diamond paste to polish the aspherical die from edge to center to edge, wherein the polishing time is 11 minutes, and polishing until the surface quality reaches 20-10.
The polished aspherical mold was inspected to have a wheel line value of 24nm, and the wheel line requirement of 25nm or less was satisfied as shown in FIG. 2.
Example 2
The aspherical mould with the diameter phi 28 is polished by adopting the method.
Firstly, clamping an aspherical mold subjected to ultra-precise machining onto a workbench of a precise polishing machine, and simultaneously establishing corresponding aspherical mold coefficients;
Then, the angle of a polishing shaft is controlled to be 10 degrees, the rotating speed of the polishing shaft is controlled to be 90rpm, the rotating speed of a workpiece shaft is controlled to be 90rmp, the non-spherical surface mould is coarsely polished from edge to center to edge by adopting #1/2 diamond paste, the polishing time is 15 minutes, no processing trace is observed on the surface of the non-spherical surface mould under a microscope of 50 times after polishing, and the surface quality reaches 40-20;
And finally, controlling the rotation speed of the polishing shaft at 90rpm, controlling the rotation speed of the workpiece shaft at 90rmp, and adopting #1/4 diamond paste to polish the aspherical die from edge to center to edge, wherein the polishing time is 15 minutes, and polishing until the surface quality reaches 20-10.
And detecting the polished aspherical mold, wherein the value of the wheel line is 24nm, and the wheel line requirement of the aspherical mold is less than or equal to 25 nm.
Claims (10)
1. A method of polishing an aspherical mold, comprising the steps of:
1) Clamping the aspherical mold on a precise polishing machine;
2) Controlling the angle of the polishing shaft to be 5-10 degrees, controlling the rotating speed of the polishing shaft to be 80-100rpm, controlling the rotating speed of the workpiece shaft to be 80-100rmp, keeping the rotating speeds of the polishing shaft and the workpiece shaft consistent, and performing rough polishing on the aspherical mold from edge to center to edge by adopting # 1/No. 2 diamond paste;
3) The rotation speed of the polishing shaft is controlled to be 80-100rmp, the rotation speed of the workpiece shaft is controlled to be 80-100rmp, the rotation speeds of the polishing shaft and the workpiece shaft are kept consistent, and #1/4 diamond paste is adopted to finely polish the aspherical mold from edge to center and then from edge to edge.
2. The method of polishing an aspherical mold according to claim 1, wherein the aspherical mold of step 1) is an ultra-precisely machined aspherical mold.
3. The method of claim 1, wherein in step 1), after the aspherical mold is clamped to the precision polishing machine, the flatness of the aspherical mold is within 1 μm, and the concentricity of the aspherical mold is controlled within 1 μm, while corresponding aspherical mold coefficients are established.
4. The method of claim 1, wherein the polishing head of the precision polishing machine in step 1) is a polishing head having an R value of 5mm, and the polishing head is fixed after being wrapped with polyurethane polishing cloth.
5. The method of claim 1, wherein the precision polisher of step 1) is a precision automatic polisher having an X-axis, a B-axis, a Z-axis, a polishing axis, and a workpiece axis.
6. The method of claim 1, wherein the surface quality of the aspherical mold after the rough polishing in step 2) is 40 to 20.
7. The method of claim 1, wherein the surface quality of the aspherical mold after the rough polishing in step 3) is 20 to 10.
8. The method for polishing an aspherical mold according to claim 1, wherein in the step 2) and the step 3), the polishing paste and the polishing oil are mixed in a weight ratio of 1:1 are mixed and uniformly smeared on the surface of the aspherical mould.
9. The method of claim 1, wherein the polishing head applies a load of 130-160g/cm 2 to the aspherical mold in the step 2) and the step 3).
10. The method of claim 1, wherein the polishing time is set according to the size of the aspherical mold in the step 2) and the step 3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410311627.2A CN118288114A (en) | 2024-03-19 | 2024-03-19 | Polishing method of aspherical mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410311627.2A CN118288114A (en) | 2024-03-19 | 2024-03-19 | Polishing method of aspherical mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118288114A true CN118288114A (en) | 2024-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410311627.2A Pending CN118288114A (en) | 2024-03-19 | 2024-03-19 | Polishing method of aspherical mold |
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| Country | Link |
|---|---|
| CN (1) | CN118288114A (en) |
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2024
- 2024-03-19 CN CN202410311627.2A patent/CN118288114A/en active Pending
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