Assembly for processing potassium bromide optical plane lens

Abstract

The utility model discloses an assembly for processing a potassium bromide optical plane lens, which comprises a polishing disc and a lens disc, the upper surface of the polishing disc is covered with an asphalt disc for polishing the potassium bromide optical plane lens, and the potassium bromide optical plane lens is placed in a plurality of groups of through holes arranged on the lens disc. The lens disc is placed on the asphalt disc surface; a plurality of groups of cylindrical positioning rollers for positioning the lens disc are also arranged on one side of the lens disc, are in circumferential contact with the lens disc and can freely rotate around the central axis of the positioning rollers. The utility model solves the problems in the prior art that a polishing disc made of asphalt is poor in stability and difficult to maintain for a long time in the machining process of an optical plane lens made of a potassium bromide material, and solves the problems that the surface of the lens is difficult to be subjected to uniform friction force when the potassium bromide optical plane lens is directly clamped for accurate grinding and polishing, and the polishing effect is poor. And uneven stress can cause contact between the edge of the lens and a clamping jig, so that the edges and corners of the lens are broken, and the surface quality of the lens is influenced.

Description

Technical Field

[0001] The utility model relates to a potassium bromide optical plane lens clamping processing technology, in particular to a component used for processing a potassium bromide optical plane lens. Background Art

[0002] Potassium bromide is a commonly used optical material. It is often used to manufacture optical lenses due to its good transparency and high refractive index. However, its texture is relatively soft. In actual processing, asphalt, which is also a relatively soft material, is usually used to polish the surface of the potassium bromide optical flat lens. However, the melting point of asphalt is low at room temperature, and the surface stability of the polishing disk made of asphalt is poor, and it is difficult to maintain for a long time. At the same time, the hardness of potassium bromide material is relatively low, and it is easy to break under mechanical stress, showing a certain brittleness. If the potassium bromide optical flat lens is directly clamped for fine grinding and polishing, it is difficult to ensure uniform friction on the surface of the lens. Uneven force will cause the edge of the lens to touch the clamping fixture, which will cause the corners of the lens to break. The broken part is also prone to corrosion when exposed to the air, affecting the surface quality of the lens. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide a component for processing potassium bromide optical plane lenses, which is used to fix the potassium bromide optical plane lenses and use asphalt disks to process the upper and lower planes thereof. At the same time, the edges of the lenses can be protected during the processing, and finally better appearance quality can be obtained.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a component for processing a potassium bromide optical plane lens, comprising a polishing disk and a lens disk. The upper surface of the polishing disk is covered with an asphalt disk for polishing the potassium bromide optical plane lens, and the lens disk is placed on the asphalt disk surface; a plurality of through holes are provided in the axial direction of the lens disk, and the potassium bromide optical plane lenses are placed in the through holes; a plurality of cylindrical positioning rollers for positioning the lens disk are also provided on one side of the lens disk, and the plurality of positioning rollers are in contact with the circumference of the lens disk and can rotate freely around their own central axis.

[0005] The center of the lower surface of the polishing disc is provided with a cylinder for clamping the polishing disc on the ring polishing machine. The ring polishing machine drives the polishing disc to rotate at a uniform speed around its own central axis by clamping the cylinder.

[0006] The upper surface of the asphalt disc is provided with grooves interlaced in vertical and horizontal directions.

[0007] During the polishing process of the asphalt disc, the surface shape of the asphalt disc is corrected using a correction disc made of stainless steel. The standard surface of the correction disc is aligned with the upper surface of the asphalt disc, the plane aperture of the standard surface is 0, and the surface shape is <0.1.

[0008] The diameter of the lens disk is smaller than that of the asphalt disk, and the lens disk is located within the circumference of the upper surface of the asphalt disk.

[0009] Both sides of each through hole on the lens plate are provided with arc grooves smaller in size than the through hole.

[0010] A soft adhesive tape is attached to the inner wall of each through hole on the lens disc, and the gap between the potassium bromide optical plane lens and the inner wall of the through hole is the width of two layers of soft adhesive tape.

[0011] The potassium bromide optical plane lens is embedded in the through hole of the lens disk.

[0012] A metal pressing sheet is placed above the potassium bromide optical plane lens in the through hole of the lens disc.

[0013] Beneficial effects: The utility model has the following advantages: 1. The assembly includes a correction disk made of stainless steel, and the correction disk is used regularly to correct the surface shape of the asphalt disk, which solves the problem that the asphalt disk is easy to soften during the polishing process and the surface shape is difficult to maintain for a long time;

[0014] 2. The upper surface of the asphalt plate is provided with crisscross grooves, which are conducive to accommodating an appropriate amount of polishing liquid and polishing powder on the asphalt plate. The polishing liquid can also flow through the grooves to take away the tiny powder ground from the lens material, making it easier to clean. It is also conducive to the heat dissipation of the asphalt plate.

[0015] 3. The assembly is provided with multiple groups of positioning rollers that can rotate freely around their central axes, so that when the asphalt disc rotates in a circular motion on the ring polishing machine, the lens disc will not rotate synchronously with the asphalt disc surface. Instead, under the action of the friction force with the asphalt disc, the lens disc will further rotate around its own central axis, increasing the friction force with the asphalt disc surface, thereby improving the polishing effect;

[0016] 4. Arc grooves are provided on both sides of each through hole on the lens disk, so that the potassium bromide optical plane lens can be easily taken out of the through hole. At the same time, a metal pressing sheet is placed above the potassium bromide optical plane lens in the through hole, so that the potassium bromide optical plane lens is pressed down to fit the asphalt disk surface by utilizing the gravity of the metal pressing sheet. This design is not only simple in structure and convenient for clamping, but also enables the lens to be subjected to uniform force, thus avoiding direct clamping of the potassium bromide optical plane lens for processing, which makes it difficult to ensure uniform friction on the lens surface, resulting in the edge of the lens touching the clamping fixture and breaking, affecting the surface quality of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the component structure. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described in detail below in conjunction with the embodiments and drawings.

[0019] like Figure 1 As shown, the assembly of the utility model includes a polishing disc 1, a lens disc 2, a potassium bromide optical plane lens 3, a metal pressing sheet 4, and a positioning roller 5. The polishing disc 1 is a disc surface made of metal, and a cylinder is provided at the center of its lower surface, which is used to clamp the polishing disc 1 on the ring polishing machine and rotate around the axis through the cylinder, thereby driving the polishing disc to rotate at a uniform speed around its center axis.

[0020] The upper surface of the polishing disc 1 is covered with an asphalt disc, which is obtained by covering the upper surface of the polishing disc 1 with a softened asphalt mixture and cooling it. The upper surface of the asphalt disc is provided with crisscrossing grooves. The setting of the grooves is conducive to accommodating an appropriate amount of polishing liquid and polishing powder on the asphalt disc surface. At the same time, the flow of the polishing liquid in the grooves can take away the tiny powder ground from the lens material, which is also conducive to the heat dissipation of the asphalt disc surface. During the processing, the asphalt disc will be regularly corrected by a correction disc, and the corrected asphalt disc is used to polish the potassium bromide optical plane lens. The ratio of the width of the groove to the diameter of the potassium bromide optical plane lens is about 0.1.

[0021] The correction plate is made of stainless steel, and the plane aperture of the standard surface used to correct the asphalt plate surface is 0, and the surface accuracy is <0.1. The standard surface of the correction plate is aligned with the upper surface of the asphalt plate, and the correction plate is pressed down with evenly distributed pressure, so that the surface accuracy of the asphalt plate surface after pressing can be close to 0.1. During the initial correction, a proper amount of warm water can be poured on the asphalt plate surface to soften the asphalt to increase the pressing speed, and it can be dried after the initial pressing is completed.

[0022] The diameter of the lens disk 2 is smaller than that of the asphalt disk, and the lens disk 2 is located within the circumference of the upper surface of the asphalt disk. The lens disk 2 is made of glass, and its bottom surface is a standard plane surface. There are multiple groups of through holes evenly arranged on the lens disk 2, and soft tape is attached to the inner wall of the through hole. There are arc grooves smaller than the through hole on both sides of each through hole. The potassium bromide optical plane lens 3 is placed in the through hole, and the surface to be processed is placed downward, that is, placed toward the polishing disk 1. The gap between the potassium bromide optical plane lens 3 and the inner wall of the through hole is the width of two layers of soft tape. The thickness of the lens disk 2 is greater than the thickness of the potassium bromide optical plane lens 3, that is, the lens is embedded in the through hole, and the arc grooves on both sides of the through hole are arranged to facilitate the removal of the potassium bromide optical plane lens 3 from the through hole. In the through hole, a metal pressing sheet 4 is placed above the potassium bromide optical plane lens 3, and the gravity of the metal pressing sheet 4 is used to press the potassium bromide optical plane lens 3 down to fit the asphalt disk surface. During the processing, an additional piece of flannel is placed between the potassium bromide optical flat lens 3 and the metal pressing sheet 4.

[0023] Three groups of cylindrical positioning rollers 5 that do not contact the asphalt disc surface are provided on one side of the lens disc 2. The outer ring of each group of positioning rollers 5 is in contact with the circumference of the lens disc 2 and can move freely around its own central axis. After the lens disc 2 is placed on the upper surface of the asphalt disc, the positions of the three groups of rollers 5 are adjusted to position the lens disc 2. That is, when the asphalt disc rotates in a circular motion on the ring polishing machine, the lens disc 2 will not follow the asphalt disc surface but rotate around the central axis of the cylinder due to the obstruction of the three groups of cylindrical positioning rollers 5. At the same time, since the three groups of rollers 5 can move freely around their own central axis, the lens disc 2 will further rotate around its own central axis under the action of the friction force with the asphalt disc, thereby improving the grinding effect.

[0024] Working principle:

[0025] 1. Prepare polishing solution

[0026] Alumina polishing powders of different particle sizes are mixed in a water-free, fluid ethylene glycol liquid, and stirred evenly to form a polishing liquid, including fine grinding polishing liquid (alumina particle size is 3um) and asphalt polishing liquid (alumina particle size is 0.05um).

[0027] 2. Fine grinding of potassium bromide optical plane lens

[0028] Clamp the lower cylinder of the polishing disc 1 on the ring polishing machine, add fine grinding and polishing liquid to the upper surface of the polishing disc 1, then place the lens disc 2 on the polishing disc 1, and put potassium bromide optical plane lens 3, flannel cloth, and metal pressing sheet 4 into each through hole on the lens disc 2 in sequence, and stick soft tape on the inner circle of each through hole;

[0029] Adjust the positions of the three groups of cylindrical positioning rollers 5 so that their outer rings are in contact with the circumference of the lens disc 2 to position the lens disc 2;

[0030] The ring polishing machine is started, and the polishing disc 1 is driven to rotate by the cylinder rotating around the axis (the speed is 50 rpm, and the time is 2 hours), so as to finely grind the potassium bromide optical plane lens 3;

[0031] After completion, turn over the potassium bromide optical plane lenses 3 in the through holes of the lens plate 2, and put flannel cloth and metal pressing sheet 4 in turn to perform second surface fine grinding. After completion, take out the potassium bromide optical plane lenses 3, clean and dry them.

[0032] 3. Prepare asphalt disc

[0033] When the workshop temperature is about 20℃, evenly mix the softened Global 55 asphalt (softening temperature 50-65°) and alumina (particle size 0.05um) in a ratio of 10:1; wrap the outer circle of the polishing disc 1 with thick kraft paper, and the upper end of the thick kraft paper is 10mm higher than the upper surface of the polishing disc 1. Pour the mixture onto the polishing disc surface 1 and smooth it so that the thickness of the mixture spread on the polishing disc is about 10mm; wait for the mixture to cool to the workshop temperature and form a solid asphalt disc surface, then groove its upper surface, that is, groove the surface of the asphalt disc with a tooth saw to form criss-cross grooves with a groove depth of 3mm, a groove width of 0.5mm, and a groove spacing of 10mm.

[0034] 4. Use the correction plate to correct the asphalt plate surface

[0035] Use a correction disc to initially press and adjust the asphalt disc surface on the polishing disc 1. During the initial pressing and adjusting, pour a proper amount of warm water at about 60°C on the asphalt disc to soften the asphalt disc surface to facilitate shaping. After the surface correction is completed, clean and dry it.

[0036] 5. Polishing of potassium bromide optical flat lens

[0037] Add asphalt polishing liquid to the upper surface of the asphalt disk, then place the lens disk 2 on the asphalt disk surface, and put the potassium bromide optical plane lens 3 and the metal pressing plate 4 into the through holes on the lens disk 2 in sequence, and use flannel cloth to isolate the potassium bromide optical plane lens 3 and the metal pressing plate 4;

[0038] Adjust the positions of the three groups of cylindrical positioning rollers 5 so that their outer rings are in contact with the circumference of the lens disc 2 to position the lens disc 2;

[0039] The ring polishing machine is started, and the asphalt disk is driven to rotate by the cylinder rotating around the axis (the speed is 30 rpm, and the time is 3 hours), so as to polish one side of the potassium bromide optical flat lens 3;

[0040] After the process is finished, the potassium bromide optical plane lenses 3 in the through holes of the lens disc 2 are turned over, and the flannel and metal pressing sheet 4 are put back in to perform the second surface polishing (rotation speed is 30 rpm, time is 3 hours) until the process is finished; during the long polishing process, the correction disc is used regularly to correct the surface shape of the asphalt disc;

[0041] After the second plane of the potassium bromide optical plane lens 3 is polished, it is turned over again, that is, turned back to the first polished surface, and polished again (the speed is 30 rpm, the time is 10 seconds) to remove the slight corrosion on the surface of the first surface caused when polishing the second surface. In this process, it is not necessary to put in the metal pressure 4 to prevent damage or corrosion to the polished second surface. The potassium bromide optical plane lens 3 relies on its own weight to achieve the second polishing of the first surface;

[0042] Finally, the potassium bromide optical plane lens 3 is taken out, cleaned and stored in a drying box. For long-term storage of the lens, nitrogen needs to be flushed into the drying box to prevent water vapor in the air from corroding the lens.

[0043] The above-mentioned process of removing the potassium bromide optical plane lens 3 from each through hole of the lens disc 2 is as follows: the asphalt disc maintains the required rotation speed during polishing unchanged, and the fingers remove the potassium bromide optical plane lens 3 in each through hole while maintaining a consistent movement trajectory with the lens disc 2, thereby avoiding the asphalt disc from sticking to the surface of the potassium bromide optical plane lens 3 after stopping rotation, thereby affecting the appearance quality of the lens.

Claims

1. An assembly for processing a potassium bromide optical flat lens, comprising a polishing disc (1) and a lens disc (2), characterized in that: The upper surface of the polishing disc (1) is covered with an asphalt disc for polishing the potassium bromide optical plane lens (3), and the lens disc (2) is placed on the asphalt disc surface; the lens disc (2) is provided with a plurality of through holes in the axial direction, and the potassium bromide optical plane lens (3) is placed in the through holes; and a plurality of cylindrical positioning rollers (5) for positioning the lens disc (2) are also provided on one side of the lens disc (2), and the plurality of positioning rollers (5) are in circumferential contact with the lens disc (2) and can rotate freely around their own central axis.

2. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: A cylinder for clamping the polishing disc (1) on the ring polishing machine is provided at the center of the lower surface of the polishing disc (1). The ring polishing machine drives the polishing disc (1) to rotate at a uniform speed around its own central axis by clamping the cylinder.

3. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: The upper surface of the asphalt disc is provided with grooves interlaced in vertical and horizontal directions.

4. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: During the polishing process of the asphalt disc, the surface shape of the asphalt disc is corrected using a correction disc made of stainless steel. The standard surface of the correction disc is aligned with the upper surface of the asphalt disc, the plane aperture of the standard surface is 0, and the surface shape accuracy is <0.

1.

5. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: The diameter of the lens disk (2) is smaller than that of the asphalt disk, and the lens disk (2) is located within the circumference of the upper surface of the asphalt disk.

6. The assembly for processing potassium bromide optical flat lens according to claim 1, characterized in that: Both sides of each through hole on the lens plate (2) are provided with arc-shaped grooves smaller in size than the through hole.

7. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: A soft adhesive tape is attached to the inner wall of each through hole on the lens disk (2), and the gap between the potassium bromide optical plane lens (3) and the inner wall of the through hole is the width of two layers of soft adhesive tape.

8. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: The potassium bromide optical plane lens (3) is embedded in the through hole of the lens disc (2).

9. The assembly for processing potassium bromide optical flat lenses according to claim 1, characterized in that: A metal pressing sheet (4) is placed above the potassium bromide optical plane lens (3) in the through hole of the lens disc (2).

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