CN219113662U - High-precision infrared lens polishing clamp - Google Patents

Abstract

The application discloses high accuracy infrared lens polishing clamp includes: a concave clamp and a convex clamp; the optical element to be processed is clamped between the polishing surfaces of the concave clamp and the convex clamp; the polishing surface of the concave clamp is arranged right above the concave surface of the optical element to be processed; the polishing surface of the convex fixture is arranged right above the convex surface of the optical element to be processed; a plurality of diversion trenches are arranged on the polishing surface of the concave clamp; each diversion trench passes through the center of the polishing surface of the concave clamp; and a diversion hole is formed in the center of the polishing surface of the concave clamp and penetrates through the concave clamp. The clamp is used for clamping and producing the lens with high surface shape requirement, and the obtained lens can meet the requirement of a military airborne photoelectric system on the high-precision infrared lens.

Description

High-precision infrared lens polishing clamp

Technical Field

The application relates to the technical field of optical processing, in particular to a high-precision infrared lens polishing clamp.

Background

The airborne photoelectric aiming system adopts infrared, visible light and other sensors to image and detect the target, has the advantages of high imaging resolution, day and night work, high target tracking precision and the like, can perform laser ranging/irradiation and accurate positioning on the ground target, supports attack guidance of an accurate guided weapon, and is widely arranged on plane platforms such as unmanned aerial vehicles, transport planes and the like.

The lens is used as the most widely used and most numerous optical elements, and the processing precision is a main influencing factor of the performance of the onboard photoelectric system. Among the technical indexes for evaluating the lens, the surface shape precision, the center error, the surface quality, the center thickness and other indexes have the greatest influence on the imaging quality of the photoelectric system. The lens with higher precision can effectively improve the sight distance, imaging definition and aiming rate of the airborne photoelectric aiming system. This presents a significant challenge for lens processing.

In order to obtain the required viewing distance, the shape accuracy of the optical element is required to approach as close to the theoretical value as possible so that the imaged optical element meets the definition requirement. This requires that the optical axis of the optical system be coaxial with the optical axis of each lens, and the larger the center error is, the more difficult it is to satisfy the requirement. The center error refers to the error between the lens optical axis and the lens outer circle (i.e., mechanical axis) axis.

It is desirable to reduce the lens center error to ensure that the optical system optical axis is coaxial with the lens optical axis.

Taking an onboard infrared lens as an example, the precision requirement of the spherical surface shape of the lens is n=4, and Δn=0.5. The precision requirement of the lens surface shape obtained by the existing method and equipment capable of realizing batch processing is N=5, delta N=1, and the required precision cannot be achieved.

In some infrared optical systems, the optical lens must be a hemispherical or nearly hemispherical lens to meet the optical imaging requirement, and processing such lens is always a difficult point for processing optical parts, and compared with other lens components which are flatter, the lens has the problems of low yield and time-consuming processing.

The existing clamp can be used for grinding against an optical element, but the polishing liquid on the end face of the clamp is not fully distributed on the grinding contact surface, so that the polishing surface shape of the processed lens is uneven, and the aperture of the lens in the same batch is unstable. Resulting in a large amount of waste.

Disclosure of Invention

The application provides a high accuracy infrared lens polishing clamp to above-mentioned technical problem, adopts this anchor clamps centre gripping lens processing hemisphere type or nearly hemisphere type lens, and the qualification rate of gained lens is high, machining efficiency is high.

The application provides a high accuracy infrared lens polishing clamp, include: a concave clamp and a convex clamp; the optical element to be processed is clamped between the polishing surfaces of the concave clamp and the convex clamp;

the polishing surface of the concave clamp is arranged right above the concave surface of the optical element to be processed; the polishing surface of the convex fixture is arranged right above the convex surface of the optical element to be processed;

a plurality of diversion trenches are arranged on the polishing surface of the concave clamp; each diversion trench passes through the center of the polishing surface of the concave clamp; a guide hole is formed in the center of the polishing surface of the concave clamp in a way of penetrating through the concave clamp;

a plurality of diversion trenches are arranged on the polishing surface of the convex fixture; each diversion trench passes through the center of the polishing surface of the convex fixture; a diversion hole is formed in the center of the polishing surface of the convex fixture and penetrates through the convex fixture;

the diversion trenches and diversion holes on the polishing surface of the concave clamp are staggered to form uniform net distribution;

the diversion trenches and diversion holes on the polishing surface of the convex fixture are staggered to form uniform net distribution.

Preferably, the concave jig includes: a raised head and a rod body; a polishing surface is arranged on the end face of the raised head; the other end face of the raised head is connected with the rod body; the diversion hole is arranged through the convex head and the axis of the rod body.

Preferably, the convex fixture comprises: a socket head and a rod body; a polishing surface is arranged on the end face of the concave head; the other end face of the concave head is connected with the rod body; the diversion hole is arranged through the concave head and the axis of the rod body.

Preferably, the diversion trench is arranged in a radial shape towards the edge of the polishing surface by taking the center point of the polishing surface as a circle.

Preferably, 1-8 diversion trenches are arranged on the polishing surface.

Preferably, the cross section of the diversion trench is in an inverted wedge shape; the open end of the inverted wedge shape is arranged on the polishing surface.

Preferably, the two opposite edges of the open end of the diversion trench are provided with first chamfers; second chamfers are arranged on two opposite side edges of the bottom of the diversion trench.

Preferably, the width of the open end is 0.5-2 mm; the width of the groove bottom is 0.3-1.5 mm; the depth of the diversion trench is 0.3-1 mm.

The beneficial effects that this application can produce include:

1) The application provides a high accuracy infrared lens polishing anchor clamps realizes respectively the concave surface of light component, the reliable centre gripping of convex surface through pairing setting up convex surface, concave surface anchor clamps to offer many guiding gutter through the centre of a circle on the grinding terminal surface of convex surface, concave surface anchor clamps respectively, and open the water conservancy diversion hole at anchor clamps axial, effectively improve the polishing solution and contact the surface between the homogeneity of distribution of face at optical component and anchor clamps, effectively solve the polishing solution and partially distribute the inhomogeneous problem of polishing surface shape of lens after the insufficient processing that leads to, effectively improve the machining precision of processing face type lens, reduce the rejection rate, improve machining efficiency.

2) The high-precision infrared lens polishing clamp provided by the application is used for clamping and producing the lens with high surface shape requirement, and the obtained lens can meet the requirement of a military airborne photoelectric system on the high-precision infrared lens.

Drawings

FIG. 1 is a schematic diagram of a front view of a concave surface fixture in a high-precision infrared lens polishing fixture provided by the application; a) A schematic diagram of a front cross-sectional structure of the clamp; b) A schematic top view structure of the clamp; c) A schematic cross-sectional view of A-A in FIG. 1 a;

FIG. 2 is a schematic diagram of a front view of a convex fixture in the high-precision infrared lens polishing fixture provided by the application; a) A schematic diagram of a front cross-sectional structure of the clamp; b) A schematic top view structure of the clamp; c) A schematic cross-sectional view of A-A in FIG. 2 a;

FIG. 3 is a schematic view of a partially sectioned front view of a flow guide slot provided in the present application;

FIG. 4 is a schematic diagram of a front view cross-sectional structure of an infrared lens to be processed according to an embodiment of the present application;

legend description:

12. a diversion trench; 1. a concave clamp; 13. a concave head; 14. A first rod body; 3. a deflector aperture; 31. a first chamfer; 34. a second chamfer; 32. a groove bottom; 2. a convex clamp; 21. a nose; 22. a constriction section; 23. and a second rod body.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

Technical means which are not described in detail in the application and are not used for solving the technical problems of the application are all arranged according to common general knowledge in the field, and various common general knowledge arrangement modes can be realized.

Referring to fig. 1 to 3, the application provides a high accuracy infrared lens polishing clamp, include: a concave clamp 1 and a convex clamp 2 which are matched for use; the optical element to be processed is clamped between the concave clamp 1 and the convex clamp 2, and the surfaces to be processed on two sides of the optical element to be processed are aligned with the concave clamp 1 and the convex clamp 2 with corresponding shapes respectively. This arrangement is particularly suitable for the production of a surface-mounted lens.

The concave surface of the concave clamp 1 is a polished surface; the convex surface of the convex fixture 2 is a polished surface thereof. A flow guide groove 12 is provided at a center position of the polishing surface passing through each jig. The number of the diversion trenches 12 is preferably equal to that of the polishing surfaces, and the diversion trenches can be adjusted according to the area of the polishing surfaces.

Specifically, 2-8 evenly distributed flow guide grooves 12 are arranged, the number of the flow guide grooves 12 is specifically set to be adjusted according to the polishing area, for example, 1 to 5 flow guide grooves 12 concentric with the polishing surface are needed to be added to a large-caliber clamp, and the radius of the flow guide grooves 12 is preferably evenly distributed. The polishing liquid in the diversion trench 12 can be uniformly dispersed and distributed on the polishing surface under the centrifugal force of the circumferential rotation of the polishing clamp and the pressure of the part, so that the polishing surface of the part can be in full and uniform contact with the polishing liquid, the polishing uniformity and consistency of the surface of the part are improved, and the surface shape precision and the surface finish are ensured.

The section of the diversion trench 12 is of an inverted wedge-shaped structure; the top surface of the groove is opened on the polishing surface, and the groove bottom 32 of the guide groove 12 is provided with a rounding angle or an arc transition section relative to the side wall. The boundary edge between the top of the diversion trench 12 and the polishing surface is in a rounded or chamfered structure.

In one embodiment, the width of the open end of the upper bottom edge of the cross section of the flow guide groove 12 is 0.5 to 2mm, the width of the bottom 32 of the lower bottom edge groove is 0.3 to 1.5mm, and the depth is 0.3 to 1mm. This structure can increase the fluidity of the polishing liquid flowing to the polishing surface of the jig at the guide groove 12, and is convenient for cleaning and cleaning the guide groove 12 of the polishing jig after the machining is completed.

According to the arrangement, the accumulation amount of the polishing solution in the groove can be reduced, the outward smooth diffusion of the polishing solution is effectively realized, and the full filling of the polishing solution on the contact surface is improved.

In a specific embodiment, a diversion hole 3 penetrating along the central axial direction is formed in the center position of the polishing surface of the concave clamp 1 and the convex clamp 2. Specifically, on the polishing surface bottom surface of the concave jig 1; the top surface of the polishing surface of the convex fixture 2 is provided with a diversion hole 3.

The diversion trenches 12 arranged on the polishing surface are communicated with the diversion holes 3, and are staggered to form even net distribution. The full state of the polishing solution on the contact surface is effectively improved, and the problem of uneven local polishing surface of the optical element is avoided.

When the element is processed, the polishing liquid flows into the polishing surface and the diversion trench 12 along the edges of the concave-convex clamp 2, and the polishing liquid in the diversion trench 12 flows into the bottom diversion hole 3 of the clamp and flows out under the action of gravity. Meanwhile, the polishing liquid flows out to the periphery and uniformly distributes on the polishing surface of the clamp under the action of the circumferential rotation centrifugal force of the clamp, so that the surface of the part and the polishing surface of the clamp are uniformly full of the polishing liquid, and the problem of unstable aperture caused by uneven polishing surface due to insufficient local polishing liquid distribution of the grinding contact surface is avoided. The consistency of the optical axis and the polishing efficiency of the lens obtained after polishing are ensured, and the qualification rate is improved.

The further top of the guiding gutter 12 passing through the center of the polishing surface adopts a structure of a chamfer or rounded corner edge as a first chamfer 31 at the border of the polishing surface, and the size of the chamfer is 0.2 to 1mm. The mobility of the polishing solution in the diversion trench 12 is increased, meanwhile, the surface of a part is prevented from being scratched, and meanwhile, the diversion trench 12 of the polishing clamp is convenient to clean and clean after the machining is finished.

The structure of the edge of the border of the polishing surface, which is the second chamfer 34, is a chamfer or a rounded corner edge, the size of the chamfer is 0.2 to 1mm, and meanwhile, the deposition of polishing solution at the bottom of the guide groove 12 is avoided, and meanwhile, the guide groove 12 of the polishing clamp is convenient to clean and clean after the polishing surface is processed.

The diversion holes 3 are arranged, so that the mobility of the polishing liquid can be increased, the accumulation of the polishing liquid at the bottom and the top is avoided, the polished polishing liquid can flow out of the clamp and simultaneously new polishing liquid can smoothly flow into the clamp, and the surface shape uniformity and the polishing efficiency can be improved.

The diversion trenches 12 on the polishing surface and the diversion holes 3 on the end surface are staggered to form uniform net distribution, and the polishing liquid in the diversion trenches 12 is uniformly distributed between the part and the fixture under the centrifugal force of the circumferential rotation of the polishing fixture and the pressure of the part processing surface, so that the polishing surface quality and consistency are improved, and meanwhile, the efficiency and the qualification rate can be improved.

In a specific embodiment, in order to realize the driving of the concave clamp 1 and the convex clamp 2, a first rod body 14 is arranged on the bottom surface of a concave head 13 of the concave clamp 1 provided with a polishing surface; the diversion hole 3 penetrates through the first rod body 14; the convex fixture 2 is provided with a second rod body 23 on the bottom surface of the convex head 21 with the polishing surface; the deflector hole 3 penetrates the second rod body 23.

In one embodiment, the junction of the nose 21 and the second rod 23 is provided with a constriction 22. Is convenient to process into a spherical convex head 21.

Examples

The equipment used in the examples below was commercially available unless otherwise specified, and the processing methods used were all conventional processing methods unless otherwise specified.

Example 1

By adopting the fixture provided by the application, the infrared lens shown in fig. 4 is processed into a circular optical element, the diameter phi of the optical element is 17mm, the center thickness of the optical element is 3mm, one surface is a spherical concave surface, the curvature radius R11mm, the other surface is a spherical convex surface, and the curvature radius R10mm. The requirements of the machined spherical surface shape of the element are as follows: the aperture n=4, Δn=0.4, and the above index is one level higher than the general lens surface shape accuracy.

When the convex surface of the element is processed, the concave clamp 1 is shown in the attached figure 1, the total height 56 of the clamp, the curvature radius of the concave surface of the processed surface is 10.5, the caliber is 22mm, three diversion trenches 12 penetrating through the center of the concave surface are arranged on the processed surface of the concave clamp 1, the diversion trenches 12 are uniformly distributed on the spherical surface, and the top view structure of the diversion trenches 12 is shown in the attached figure 1.

The concave surface of the element is processed by using a convex fixture 2 shown in figure 2, the width of the open side of the top surface of a diversion trench 12 arranged on the outward protruding end of the convex fixture 2 is 1mm, the width of the bottom 32 of the trench is 0.6mm, the depth is 0.5mm, the open position of the top surface of the trench is provided with a round angle of 0.2mm, the round angle is shown in figure 3, and the center of the diversion trench is provided with a diversion hole 3 with the diameter of 1mm.

The total height of the convex fixture 2 is 44mm, the curvature radius of the convex surface of the machined surface is 10.5mm, the caliber of the rod body is 18mm, three diversion trenches 12 penetrating through the center are arranged on the machined convex surface and are uniformly distributed on the spherical surface, and the section structure of the diversion trenches 12 is shown in fig. 3.

The upper width of the diversion trench 12 is 1mm, the lower width is 0.6mm, the depth is 0.5mm, and a round angle of 0.2mm is formed.

The center of the processing surface of the convex and concave clamp 1 is provided with a diversion hole 3 with the diameter of 1mm.

When in use, the polishing solution is sprayed along the edge of the matched clamp, and the clamp processing surface is abutted against the optical element processing surface. The polishing liquid enters the polishing surface and the diversion trench 12, the polishing liquid in the diversion trench 12 flows over the contact surface of the clamp under the action of the injection pressure, and simultaneously flows out uniformly around and is distributed on the polishing surface of the clamp under the action of the circumferential rotation centrifugal force and the gravity of the clamp, so that the part surface and the polishing surface of the clamp are uniformly filled with the polishing liquid, and the defects of uneven polishing surface shape and unstable aperture caused by insufficient local polishing liquid are avoided. Ensures the straightness of polishing and the polishing efficiency and improves the qualification rate.

Comparative example

The difference from example 1 is that the jig is not used.

The qualification rate of the product obtained in the embodiment using the clamp can reach more than 95%, and the processing time is 2/3 of that of the comparative example. The qualification rate in the comparative example is only 40 percent

Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.

Claims (8)

1. The utility model provides a high accuracy infrared lens polishing jig which characterized in that includes: a concave clamp (1) and a convex clamp (2); the optical element to be processed is clamped between the polishing surfaces of the concave clamp (1) and the convex clamp (2);

the polishing surface of the concave clamp (1) is arranged right above the concave surface of the optical element to be processed; the polishing surface of the convex fixture (2) is arranged right above the convex surface of the optical element to be processed;

a plurality of diversion trenches (12) are arranged on the polishing surface of the concave clamp (1); each diversion trench (12) passes through the center of the polishing surface of the concave clamp (1); a guide hole (3) is formed in the center of the polishing surface of the concave clamp (1) and penetrates through the concave clamp (1);

a plurality of diversion trenches (12) are arranged on the polishing surface of the convex fixture (2); each diversion trench (12) passes through the center of the polishing surface of the convex fixture (2); a diversion hole (3) is formed in the center of the polishing surface of the convex fixture (2) and penetrates through the convex fixture (2);

the diversion trenches (12) and the diversion holes (3) on the polishing surface of the concave clamp (1) are staggered, and are surrounded into uniform net distribution;

the diversion trenches (12) and the diversion holes (3) on the polishing surface of the convex fixture (2) are staggered, and are surrounded into uniform net distribution.

2. The high-precision infrared lens polishing jig according to claim 1, wherein the concave jig (1) comprises: a raised head (21) and a rod body; a polishing surface is arranged on the end surface of the raised head (21); the other end face of the raised head (21) is connected with the rod body; the diversion hole (3) is arranged through the convex head (21) and the axis of the rod body.

3. The high-precision infrared lens polishing jig according to claim 1, wherein the convex jig (2) comprises: a concave head (13) and a rod body; a polishing surface is arranged on the end surface of the concave head (13); the other end face of the concave head (13) is connected with the rod body; the diversion hole (3) is communicated with the concave head (13) and the axis of the rod body.

4. The high-precision infrared lens polishing jig according to claim 1, wherein the guide groove (12) is provided in a radial shape toward the edge of the polishing surface with the center point of the polishing surface being circular.

5. The high-precision infrared lens polishing clamp according to claim 1, wherein 1-8 diversion trenches (12) are formed in the polishing surface.

6. The high-precision infrared lens polishing clamp according to claim 1, wherein the cross section of the diversion trench (12) is in an inverted wedge shape; the open end of the inverted wedge shape is arranged on the polishing surface.

7. The high-precision infrared lens polishing clamp according to claim 1, wherein a first chamfer (31) is arranged on two opposite sides of the open end of the diversion trench (12); second chamfers (34) are arranged on two opposite side edges of the groove bottom (32) of the diversion groove (12).

8. The high-precision infrared lens polishing clamp according to claim 7, wherein the width of the open end is 0.5-2 mm; the width of the groove bottom (32) is 0.3-1.5 mm; the depth of the diversion trench (12) is 0.3-1 mm.

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