Milling and polishing tool for aspheric optical part
By designing an aspherical optical parts milling and polishing tool including the spindle of CNC milling and polishing machine, the positioning end surface, lens support rod and tool clamping handle, the problems of complex clamping, low positioning accuracy, and unsolid bonding of aspherical lenses during milling and polishing are solved, and efficient and precise machining effects are achieved.
Patent Information
- Application Number
- CN202421449908.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-06-24
AI Technical Summary
During the milling and polishing process, aspherical optical lenses have problems such as complex clamping, low positioning accuracy, lens offset and unsolid bonding, resulting in low processing efficiency and pass rate.
A milling and polishing tool set including the spindle of CNC milling and polishing machine, positioning end surface, lens support rod and tool clamping handle is designed. Through the combination of spherical positioning and lever dialing table, the positioning accuracy of the lens is improved, and the contact area between the tool set and the lens is increased, thereby enhancing the bonding firmness.
It effectively improves the positioning accuracy of aspherical lenses, reduces the center deviation and exceeds the deviation, enhances the bonding firmness between the tooling and the lens, and improves the processing efficiency and pass rate.
Smart Images
Figure CN222920212U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of optical part processing, and particularly relates to a milling, grinding and polishing tooling for aspherical optical parts. Background Technique
[0002] During the milling, grinding and polishing processes of aspherical optical lenses, problems such as complex part clamping processes, loose clamping and easy falling off, and low positioning accuracy often occur, ultimately resulting in low processing efficiency and low part qualification rate of the aspherical surface. The milling, grinding and polishing devices in the prior art cannot be closely attached to the lens, and the lens is prone to shift during the milling and polishing processes, ultimately resulting in the center deviation of the aspherical surface exceeding the tolerance and not meeting the design requirements. The fundamental reason for this problem is that the structure of the device cannot meet the clamping and positioning requirements for the milling, grinding and polishing of aspherical lenses.
[0003] Since an aspherical part has only one axis of symmetry, once the processing is completed, it is very difficult to correct the center deviation through the edge grinding process in the later stage. Therefore, it is only possible to control and ensure the relative deviation between this surface and the optical axis of the completed spherical surface during the milling process. In order to make the finished product quality of the aspherical surface meet the designed technical requirements, reduce the scrap rate of aspherical lenses and improve the positioning accuracy of the lenses, first use lacquer to protect the polished spherical surface in the aspherical lens, and at the same time, it is necessary to focus on solving the problems of lens shift and low positioning accuracy caused by the loose adhesion between the lens and the tooling. By analyzing various influencing factors in the milling, grinding and polishing processes of aspherical lenses, practical and reasonable control measures are formulated, and the structure of the aspherical milling, grinding and polishing tooling is redesigned, providing important technical references and bases for the future milling, grinding and polishing processes of aspherical lenses. Content of the Utility Model
[0004] The utility model provides a milling, grinding and polishing tooling for aspherical optical parts. One of its purposes is to provide a device that can effectively improve the clamping and positioning accuracy in the processing of aspherical lenses, so as to reduce the problem of center deviation exceeding the tolerance generated by the tooling fixture positioning during the processing of the lens; the second purpose is to provide a device to solve the problem of weak adhesion between the lens to be processed and the tooling.
[0005] To achieve the above purposes, the technical solution adopted by the utility model is:
[0006] A milling, grinding and polishing tooling for aspherical optical parts at least includes the spindle of a numerically controlled milling, grinding and polishing machine; it also includes a positioning end face, a lens support rod and a tooling clamping handle; the lens support rod, the positioning end face and the tooling clamping handle are connected into an integral structure from top to bottom in sequence; the top surface of the lens support rod is the lens positioning surface; through holes that penetrate up and down are opened at the central positions of the lens support rod, the positioning end face and the tooling clamping handle; the tooling clamping handle is connected to the spindle of the numerically controlled milling, grinding and polishing machine.
[0007] The outer diameter of the positioning end face is larger than that of the tooling clamping handle; the outer diameter of the tooling clamping handle is larger than that of the lens support rod.
[0008] The outer diameter of the lens support rod is 1 - 2 mm smaller than the diameter of the aspherical lens after one-time edge grinding.
[0009] The lower surface of the positioning end face is a horizontal plane and is perpendicular to the central axis of the tooling clamping handle.
[0010] The inner diameter of the central through hole is 3 - 6 mm.
[0011] The tooling clamping handle and the spindle of the CNC milling, grinding and polishing machine adopt an H7 / g6 tolerance fit.
[0012] The lens positioning surface is a curved surface; the lens positioning surface has the same spherical curvature as the finished spherical surface of the aspherical lens to be machined, but in the opposite direction.
[0013] The center of the lens positioning surface is collinear with the central axis of the tooling clamping handle.
[0014] Beneficial effects:
[0015] (1) The utility model is composed of the spindle of the CNC milling, grinding and polishing machine, the positioning end face, the lens support rod and the tooling clamping handle. When positioning, the lever dial indicator is used to control the outer cylindrical surface of the aspherical lens within 0.01 mm, making the positioning accuracy of the aspherical lens higher.
[0016] (2) The utility model adopts spherical positioning, solves the problem that the lens positioning is prone to deviation, and at the same time increases the contact area between the aspherical lens and the tooling, solving the problem that the lens and the tooling are not firmly bonded.
[0017] (3) The structure of the utility model is simple and the operation is convenient.
[0018] (4) The processing cost of the utility model is low.
[0019] (5) The utility model can be recycled for the processing of the same type of aspherical lens.
[0020] The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the content of the specification, the following takes the preferred embodiment of the utility model and combines with the attached drawings to describe in detail as follows. Description of the drawings
[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0022] Figure 1 is a schematic structural diagram of the present invention.
[0023] Figure 2 is a schematic diagram of the state of milling, grinding and polishing an aspherical lens.
[0024] Figure 3 is a schematic diagram of an aspherical lens.
[0025] In the figure: 1, aspherical tooling; 2, aspherical lens; 1-1, central through hole; 1-2, positioning end face; 1-3, lens support rod; 1-4, lens positioning surface; 1-5, tooling clamping handle; 2-1, outer cylindrical surface; 2-2, aspherical surface; 2-3, spherical surface. Specific embodiments
[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0027] Embodiment 1:
[0028] According to Figures 1 - 3 shown in an aspherical optical part milling, grinding and polishing tooling, at least including the main shaft of a numerically controlled milling, grinding and polishing machine; further including a positioning end face 1-2, a lens support rod 1-3 and a tooling clamping handle 1-5; the lens support rod 1-3, the positioning end face 1-2 and the tooling clamping handle 1-5 are connected into an integral structure from top to bottom in sequence; the top surface of the lens support rod 1-3 is a lens positioning surface 1-4; through holes 1-1 that penetrate up and down are opened at the central positions of the lens support rod 1-3, the positioning end face 1-2 and the tooling clamping handle 1-5; the tooling clamping handle 1-5 is connected to the main shaft of the numerically controlled milling, grinding and polishing machine.
[0029] In actual use, the specific process of milling, grinding and polishing an aspherical optical part using the present invention is as follows:
[0030] Step 1: The aspherical lens 2 goes through processes such as blanking - leveling the end face - rolling the rubber strip into a circle - inspection - rough grinding the spherical surface - inspection - fine grinding the spherical surface - polishing the spherical surface (leaving a machining allowance of 0.3 - 0.4 mm) - inspection - primary edge grinding (correcting the perpendicularity of the end plane and the outer circle and the spherical eccentricity) - inspection, etc., and then flows to the processes of milling and polishing the aspherical surface. Measure the central thickness of the aspherical lens 2 to be milled one by one and record the numbers. Then evenly apply protective lacquer on the polished spherical surface and let it stand for more than 12 hours.
[0031] Step 2: Clean the workbench of the CNC milling machine and the milling and polishing tooling for the aspherical optical parts. Put the clamping handle 1 - 5 of the tooling into the workbench of the CNC milling machine, make the positioning end face 1 - 2 fit with the workbench, and use an internal hexagonal wrench to clamp the milling and polishing tooling for the aspherical optical parts.
[0032] Step 3: Place the spherical surface 2 - 3 of the aspherical lens 2 to be milled on the lens positioning surface 1 - 4 in the milling and polishing tooling for the aspherical optical parts. Turn on the vacuum adsorption function, and use a lever dial indicator to measure the outer cylindrical surface 2 - 1 of the aspherical lens 2 to be milled, ensuring that the runout of the outer cylindrical surface is within 0.01 mm.
[0033] Step 4: Use quick - drying glue to fill the gap between the spherical surface 2 - 3 of the aspherical lens 2 to be milled and the lens positioning surface 1 - 4 in the milling and polishing tooling for the aspherical optical parts. After waiting for 5 minutes, turn off the vacuum adsorption and let it stand for more than 30 minutes.
[0034] Step 5: Remove the tooling fixture bonding the aspherical lens 2, rotate it 180°, and drip an appropriate amount of quick - drying glue from the central through - hole 1 - 1 to reinforce the aspherical lens 2, and let it stand for more than 3 hours.
[0035] Step 6: Use purple light glue to seal the gap between the spherical surface 2 - 3 of the aspherical lens 2 to be milled and the lens positioning surface 1 - 4 in the milling and polishing tooling for the aspherical optical parts to prevent the coolant and polishing powder from corroding the quick - drying glue and causing the parts to fall off.
[0036] Step 7: Measure the overall height of the milling and polishing tooling for the aspherical optical parts and the aspherical lens 2 one by one and record them, and reasonably allocate the machining allowances for the milling process and the polishing process;
[0037] Step 8: Mill the aspherical lens 2 on the CNC milling machine.
[0038] Step 9: Polish the aspherical lens 2 on the CNC polishing machine. After passing the inspection, soak the polished aspherical lens 2 and the milling and polishing tooling for the aspherical optical parts in an acetone solution to separate the two, and take out the milling and polishing tooling for the aspherical optical parts and the aspherical lens 2 respectively.
[0039] Step Ten: After scrubbing the milling and polishing tooling for aspherical optical parts clean with acetone or water, it can be recycled.
[0040] The structure of the tooling fixture for processing the aspherical tooling of the present utility model is simple, with low processing costs and convenient operation process. The same aspherical lens can be recycled.
[0041] Embodiment Two:
[0042] According to Figure 1 and Figure 2 shown in an aspherical optical part milling and polishing tooling, the difference from Embodiment One is that: the outer diameter of the positioning end face 1-2 is greater than the outer diameter of the tooling clamping handle 1-5; the outer diameter of the tooling clamping handle 1-5 is greater than the outer diameter of the lens support rod 1-3.
[0043] Furthermore, the outer diameter of the lens support rod 1-3 is 1-2 mm smaller than the diameter of the aspherical lens after one edge grinding.
[0044] During actual use, with the positioning end face 1-2, the tooling clamping handle 1-5, and the lens support rod 1-3 adopting the above technical solutions, the stability of the present utility model is enhanced. The design that the outer diameter of the lens support rod 1-3 is 1-2 mm smaller than the diameter of the aspherical lens after one edge grinding makes the subsequent glue bonding more firm.
[0045] Embodiment Three:
[0046] According to Figure 1 and Figure 2 shown in an aspherical optical part milling and polishing tooling, the difference from Embodiment One is that: the lower surface of the positioning end face 1-2 is a horizontal plane and is perpendicular to the central axis of the tooling clamping handle 1-5.
[0047] During actual use, with the positioning end face 1-2 adopting the above technical solution, the present utility model can be closely attached to the end face of the spindle of the CNC milling and polishing machine, and together with the tooling clamping handle 1-5, it positions the milling and polishing tooling for the aspherical optical part.
[0048] Embodiment Four:
[0049] According to Figure 1 and Figure 2 shown in an aspherical optical part milling and polishing tooling, the difference from Embodiment One is that: the inner diameter of the central through hole 1-1 is 3-6 mm.
[0050] During actual use, with the inner diameter of the central through hole 1-1 adopting the technical solution of 3-6 mm, it is convenient to fix the aspherical lens during vacuum adsorption.
[0051] Embodiment Five:
[0052] According toFigure 1 and Figure 2 The milling and polishing tooling for an aspherical optical part shown in Figure 2 is different from that in Embodiment 1 or Embodiment 2 in that: the tooling clamping handle 1-5 and the spindle of the numerical control milling and polishing machine adopt an H7 / g6 tolerance fit.
[0053] In actual use, the tooling clamping handle 1-5 and the spindle of the numerical control milling and polishing machine adopt an H7 / g6 tolerance fit, ensuring the stability of the connection of the present utility model.
[0054] Embodiment 6:
[0055] According to Figures 1 - 3 The milling and polishing tooling for an aspherical optical part shown in Figures 1 - 3 is different from that in Embodiment 1 in that: the lens positioning surface 1-4 is a spherical surface; the lens positioning surface 1-4 has the same curvature as the finished spherical surface of the aspherical lens to be processed, but in the opposite direction.
[0056] Furthermore, the center of the lens positioning surface 1-4 is collinear with the central axis of the tooling clamping handle 1-5, ensuring that the coaxiality of the tooling positioning surface 1-4 and the tooling clamping handle 1-5 is controlled within 0.01 mm during turning processing.
[0057] In actual use, the lens positioning surface 1-4 adopts a spherical surface, and the technical solution that the lens positioning surface 1-4 has the same curvature as the finished spherical surface of the aspherical lens to be processed and in the opposite direction enables the finished spherical surface to closely fit with the lens positioning surface 1-4.
[0058] In this embodiment, the center of the lens positioning surface 1-4 is collinear with the central axis of the tooling clamping handle 1-5, that is, ensuring the concentricity of the center of the spherical surface 2-3 and the tooling clamping handle 1-5. Using spherical positioning, the aspherical lens 2 has a certain self-centering effect when placed on the milling and polishing tooling for the aspherical optical part. Combining with using a lever dial indicator to control the outer cylindrical surface of the aspherical lens within 0.01 mm during positioning makes the positioning accuracy of the aspherical lens 2 higher.
[0059] When using spherical positioning, axial constraints are provided to the aspherical part in the horizontal direction, preventing the aspherical lens 2 from moving horizontally, solving the problem that the lens positioning is prone to deviation; at the same time, the contact area between the aspherical lens 2 and the milling and polishing tooling for the aspherical optical part is increased, solving the problem that the adhesion between the aspherical lens 2 and the milling and polishing tooling for the aspherical optical part is not firm.
[0060] Without conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. The specific combination situations are not elaborated one by one here.
[0061] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.
[0062] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.
[0063] As mentioned above, these are only the preferred embodiments of the present utility model. The present utility model will not be limited to these embodiments shown in this text, but rather should conform to the broadest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.
Claims
1. A milling and polishing tool for aspheric optical parts, comprising at least a CNC milling and polishing machine spindle; characterized in that: It also comprises a positioning end surface (1-2), a lens support rod (1-3) and a tool clamping handle (1-5); the lens support rod (1-3), the positioning end surface (1-2) and the tool clamping handle (1-5) are sequentially connected from top to bottom to form an integral structure; the top surface of the lens support rod (1-3) is a lens positioning surface (1-4); a central through hole (1-1) is formed at the center of the lens support rod (1-3), the positioning end surface (1-2) and the tool clamping handle (1-5); and the tool clamping handle (1-5) is connected to the main shaft of a numerically controlled milling and polishing machine.
2. The milling and polishing tool for aspheric optical parts according to claim 1, characterized in that: The outer diameter of the positioning end surface (1-2) is greater than the outer diameter of the tool clamping handle (1-5); and the outer diameter of the tool clamping handle (1-5) is greater than the outer diameter of the lens support rod (1-3).
3. The milling and polishing tool for aspherical optical parts according to claim 2, characterized in that: The outer diameter of the lens support rod (1-3) is 1 to 2 mm smaller than the diameter of the aspheric lens after primary edge grinding.
4. A milling and polishing tool for aspheric optical parts as claimed in claim 1 or 2, characterized in that: The lower surface of the positioning end surface (1-2) is a horizontal plane and is perpendicular to the central axis of the tooling clamping handle (1-5).
5. The milling and polishing tool for aspheric optical parts according to claim 1, characterized in that: The inner diameter of the central through hole (1-1) is 3 to 6 mm.
6. A milling and polishing tool for aspheric optical parts according to claim 1 or 2, characterized in that: The tooling clamping handle (1-5) and the main shaft of the CNC milling and polishing machine are matched with a tolerance of H7 / g6.
7. The milling and polishing tool for aspheric optical parts according to claim 1, characterized in that: The lens positioning surface (1-4) is a spherical surface; the lens positioning surface (1-4) has the same curvature as the finished spherical surface of the aspheric lens to be processed, but has an opposite direction.
8. The milling and polishing tool for aspherical optical parts according to claim 7, characterized in that: The center of the lens positioning surface (1-4) is colinear with the central axis of the tooling clamping handle (1-5).