CN111360637A - Optical element double station processing device - Google Patents

Abstract

The invention provides a dual-station processing device for optical components, which includes a workpiece carrying platform and two-station processing mechanisms, as well as a carrier driving mechanism for driving the workpiece bearing platform to rotate around its own axis. A station polishing disc for polishing the workpiece on the workpiece carrying table, a station swing arm whose one end is connected and fixed with the station polishing disc, and a station drive assembly that can control the rotation of the station swing arm. The rotation axis of the station swing arm is parallel to the The rotation axis of the workpiece carrying table, and the two-station polishing discs are located on the two stations of the aspherical element on the workpiece carrying table during processing. In the present invention, the processing of the coaxial aspherical optical element and the correction of local errors can be realized by the combination of continuous rotation and fixed-angle reciprocating oscillation, and the reciprocating oscillation of the aspherical optical element to be processed is driven by the workpiece carrier to cooperate with the two stations. The small swing swing of the polishing disc realizes the polishing of off-axis aspherical optical elements, which can effectively ensure the processing quality.

Description

Optical element double station processing device

technical field

The invention belongs to optical element processing, in particular to a double-station processing device for optical elements.

Background technique

Aspherical optical elements have the advantages of flexible optical system design, good imaging quality, less light energy loss, miniaturization and light weight of instruments, simpler systems and unique advantages in correcting aberrations. The higher the spatial observation resolution of the system, the better the light-gathering ability and the signal-to-noise ratio, and the effect of long focal length and large field of view. Therefore, it is widely used in various fields such as large telescopes, space cameras, and military reconnaissance.

At present, the processing of medium-caliber aspheric surfaces mainly includes traditional processing technology and modern processing technology. The traditional processing technology mainly completes the processing of aspheric optical components through the combination of traditional tape polishing machine and manual grinding by senior technicians. This method is relatively dependent on people, there are certain artificial uncertainties, low processing efficiency and poor repeatability; modern processing technology mainly completes the processing of various aspherical optical components through high-precision computer numerical control machine tools, but there are also Due to the complex equipment, high cost, low efficiency and other problems; for the requirements of rapid integration of optical systems, when using the previous processing technology to process aspheric optical components, it is difficult to effectively suppress the large asphericity gradient due to single-mode processing. The intermediate frequency error affects the quality of the aspherical optical components, thus seriously affecting the imaging quality of the camera; in addition, the single-mode processing has a long processing cycle and low efficiency, which cannot meet the requirements of the development plan.

SUMMARY OF THE INVENTION

The embodiments of the present invention relate to a dual-station processing device for optical elements, which can at least solve some of the defects of the prior art.

The embodiment of the present invention relates to a dual-station processing device for optical components, which includes a workpiece carrier and two-station processing mechanisms, and also includes a carrier drive mechanism for driving the workpiece carrier to rotate around its own axis. The position processing mechanism includes a station polishing disc that can be used to polish the workpiece on the workpiece carrier, a station swing arm whose one end is connected and fixed with the station polishing plate, and a station drive assembly that can control the rotation of the station swing arm , the rotation axis of the station swing arm is parallel to the rotation axis of the workpiece carrier, and the two station polishing discs are located on the two stations of the aspherical element on the workpiece carrier during processing.

As an embodiment, the work station swing arm is horizontally arranged and located above the workpiece carrier.

As one of the embodiments, the station processing mechanism further includes a station swing shaft driven by the station drive assembly to rotate around its own axis, the station swing shaft is vertically arranged, and the station swing arm is far away from the One end of the station polishing disc is installed on the station pendulum shaft.

As one of the embodiments, the station processing mechanism further includes a voltage regulator that can rotate synchronously with the station pendulum shaft, and the voltage regulator and the station pendulum shaft are coaxially arranged, and the pressure regulator The device includes a support rod that can move in a vertical direction, and the work station swing arm is installed on the top end of the support rod.

As one embodiment, the station drive assembly includes a station drive motor, and the station drive motor is drive-connected to the station swing shaft through a crank-rocker mechanism.

As one of the embodiments, the crank-rocker mechanism includes a work-station rocker connected with the work-station pendulum shaft key, and a work-station rocker that is driven by a connecting rod and driven to rotate by the work-station drive motor. The station crank plate, one end of the connecting rod is hinged with the station rocker, the other end is connected with the T-shaped groove of the station crank plate, and the connection between the connecting rod and the station crank plate deviates The center of rotation of the crank disc of the station.

As one of the embodiments, the distance between the connection between the station crank disk and the connecting rod and the rotation axis of the station crank disk is the crank, and the maximum dimension of the crank is smaller than the length of the connecting rod, The length of the station rocker, the distance between the rotation axis of the station crank plate and the rotation axis of the station swing shaft.

As one of the embodiments, the transmission angle of the crank-rocker mechanism is not less than 50 degrees.

As an embodiment, the stage driving mechanism includes a stage driving motor, the workpiece carrying stage is supported by a main shaft, and the main shaft is located on the rotation axis of the workpiece carrying stage, and the stage driving motor is connected to the workpiece carrying stage. The main shafts are connected by a belt drive.

As one embodiment, the station polishing disc and the end of the station swing arm are connected by a thimble, and the thimble is located just above the station polishing disc.

The embodiments of the present invention have at least the following beneficial effects:

In the processing device provided by the present invention, the workpiece carrying table corresponds to the two-station processing mechanism, and when the optical element is installed on the workpiece carrying table, the two-station polishing discs of the two-station processing mechanism can simultaneously use the optical element To carry out the grinding process, specifically, the workpiece carrier can continuously rotate around its own axis, and the station swing arm can control the reciprocating swing of the station polishing plate, that is, the processing device provided by the present invention can be realized by the combination of continuous rotation and fixed-angle reciprocating swing. The processing of coaxial aspheric optical elements and the correction of local errors, and the reciprocating swing of the processed aspheric optical elements is driven by the workpiece carrier to cooperate with the small swing swing of the two-station polishing disc to realize the off-axis aspheric optical elements. Polishing; the design of the processing device of the present invention solves the difficulty of correcting local errors in the traditional method, and the problems that the off-axis aspherical optical element cannot be rotated and oscillated during processing, and two processing tools with polar coordinate systems are used in different motion modes. Work in parallel with the path in different stations of the workpiece. This dual-station processing of polishing discs with different motion modes effectively improves the processing efficiency and precision of aspheric optical components, and achieves fast response in optical processing and full-band quality. Control characteristics: simple structure, economical and practical, the use of dual-station multi-mode combined processing technology can effectively control the full-frequency error quality of optical components and improve the quality of aspheric optical components.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of an optical element dual-station processing device provided in an embodiment of the present invention;

FIG. 2 is a schematic view of processing of the optical element double-station processing apparatus of FIG. 1 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 and FIG. 2 , an embodiment of the present invention provides a dual-station processing device for optical elements, which can realize the grinding process of the surface of the optical element 3, including the workpiece carrier 1 and the two-station processing mechanism 2. The optical element 3 is installed on the workpiece carrier 1, and the optical element 3 can be processed simultaneously by the two-station processing mechanism 2. The processing device also includes a carrier drive mechanism 4, which can drive the workpiece carrier 1 to rotate around its own axis. Specifically, Ground, each station processing mechanism 2 includes a station polishing disc 5, a station swing arm 6 and a station driving assembly 7, the station polishing plate 5 is a working part of the station processing mechanism 2, and the station processing mechanism 2 is mainly composed of: The optical element 3 on the workpiece carrying table 1 is processed by the station polishing plate 5, the station drive assembly 7 is the driving part of the station processing mechanism 2, and the station swing arm 6 is the station polishing plate 5 and the work station. The transmission part between the position drive components 7, one end of the station swing arm 6 is connected and fixed with the station polishing disc 5, specifically, a thimble 11 is provided at this end of the station swing arm 6, and the station polishing disc 5 is installed on the On the thimble 11, and the station polishing disc 5 is located directly below the corresponding thimble 11, the station drive assembly 7 can control the rotation of the station swing arm 6, and then the corresponding station polishing plate 5 is driven by the station swing arm 6 to rotate synchronously, The rotation axis of the station swing arm 6 is parallel to the rotation axis of the workpiece carrier 1 , specifically, the two rotation axes are both vertical directions. During processing, the two station polishing discs 5 are located on the aspheric surface of the workpiece carrier 1 . The surface of the element is located on two different stations of the optical element 3, indicating that the processing paths of the polishing discs 5 at the two stations are different, thereby improving the processing efficiency of the processing device. In the present invention, the workpiece carrier 1 corresponds to the two-station processing mechanism 2 . When the optical element 3 is installed on the workpiece carrier 1 , the two-station polishing discs 5 of the two-station processing mechanism 2 can be passed through. At the same time, the optical element 3 is ground and processed. Specifically, the workpiece carrier 1 can continuously rotate around its own axis, and the station swing arm 6 can control the reciprocating swing of the station polishing disc 5. The optical element 3 is generally an aspherical optical element 3, including The coaxial aspherical optical element 3 and the off-axis aspherical optical element 3, that is, the processing device provided by the present invention can realize the processing of the coaxial aspherical optical element 3 and the correction of local errors through the combination of continuous rotation and fixed-angle reciprocating oscillation. , and the reciprocating swing of the workpiece carrier 1 drives the aspherical optical element 3 to be processed and the small swing swing of the two-station polishing disc 5 to realize the polishing of the off-axis aspherical optical element 3; the design of the processing device of the present invention solves the problem of The difficulty of correcting local errors with the traditional method, and the problems that the off-axis aspherical optical element 3 cannot be rotated and oscillated during processing, two processing tools with polar coordinate systems are used in different motion modes and paths in different workstations of the workpiece Working in parallel, the dual-station processing of the station polishing disc 5 with different motion modes effectively improves the processing efficiency and accuracy of the aspherical optical element 3, and achieves the characteristics of fast response of optical processing and full-frequency quality control; in addition The overall structure is simple, economical and practical, and the dual-station multi-mode combined processing technology can effectively control the full-band error quality of the optical element 3 and improve the quality of the aspherical optical element 3. The so-called multi-mode here includes: only the workpiece carrier 1 rotation, the two station polishing discs 5 do not swing back and forth; the workpiece carrier 1 rotates, and at the same time the two station polishing discs 5 or one of the station polishing discs 5 swing back and forth; the workpiece carrier 1 does not rotate, the two work The polishing disk 5 or one of the polishing disks 5 swings back and forth. These working modes can be selected according to the requirements of the optical element 3, specifically, it is very convenient to control the stage driving mechanism 4 and the two station driving assemblies 7 to work.

Referring to FIG. 1 , in the preferred solution, the two station swing arms 6 are arranged horizontally and both are located above the workpiece carrier 1. Since the station swing arm 6 and the station polishing disc 5 are connected by the thimble 11, in the work station When the surface of the optical element 3 is ground by the position polishing disc 5, the station polishing disc 5 needs to generate a polishing pressure on the optical element 3. When the station swing arm 6 is set horizontally, it is only necessary to control the vertical direction of the station swing arm 6. Move, and then can achieve the effect of controlling the polishing pressure. In order to adjust the polishing pressure, the station processing mechanism 2 also includes a station swing shaft 8. The station swing shaft 8 is arranged vertically and can be rotated around its own axis under the drive of the station drive assembly 7. The station swing arm 6 is installed Set on the station swing shaft 8, the station swing arm 6 is driven to rotate by the station swing shaft 8, the station swing shaft 8 is installed in two bearing seats, the lower bearing adopts a tapered roller bearing, and the upper part adopts a deep groove ball bearing. , to ensure the swing accuracy. A voltage regulator 9 is provided on the station pendulum shaft 8. The voltage regulator 9 can rotate synchronously with the station pendulum shaft 8, and is on the rotation axis of the station pendulum shaft 8. The support rod 10 moves in a straight direction, and the station swing arm 6 is installed on the top of the support rod 10, so that when the support rod 10 moves vertically downward, the support rod 10 drives the station swing arm 6 to synchronize with the ejector pin 11. moving down, and the ejector pin 11 can exert a downward force on the station polishing disc 5, thereby achieving the purpose of increasing the polishing pressure. Of course, when adjusting the polishing pressure, the vertical displacement of the support rod 10 is relatively small. The pressure regulator 9 can adopt a hydraulic structure similar to that of the support rod 10. The support rod 10 is a piston rod of a hydraulic structure. Generally speaking, a mounting seat is provided at the top end of the pendulum shaft 8 of the station, the support rod 10 extends out of the mounting seat, and a limiting support structure 12 is provided on the mounting seat, which may be a vertically arranged limit ring to limit the The hole diameter of the position ring is larger than the outer diameter of the station swing arm 6. One end of the station swing arm 6 is connected to the station polishing disc 5 through the ejector pin 11, and the other end is supported on the limit support structure 12. The support rod 10 is located at the limit position. Between the support structure 12 and the ejector pin 11, the station swing arm 6 can only move within the limit ring.

Continue to optimize the structure of the station processing mechanism 2. The station drive assembly 7 includes a station drive motor 13. The station drive motor 13 is connected to the station swing shaft 8 through a crank-rocker mechanism 14. The crank-rocker mechanism 14 can realize The reciprocating swing of the station swing arm 6. Specifically, the crank-rocker mechanism 14 includes a station rocker 15 and a station crank plate 16, wherein one end of the station rocker 15 is sleeved on the outer surface of the station swing shaft 8 and the two are connected by a key, The station rocker 15 drives the station swing shaft 8 to rotate synchronously, and the other end of the station rocker 15 and the connecting rod 17 are hinged, which can be spherical hinges. It is inserted into the T-shaped groove of the station crank plate 16 and fixed by T-shaped bolts. The T-shaped bolts can slide in the T-shaped groove. The station crank plate 16 is also set horizontally, which is driven by the station drive motor 13. Rotate around its own axis, the rotation axis is also vertical, and the connection between the connecting rod 17 and the station crank plate 16 deviates from the rotation axis of the station crank plate 16, then when the station crank plate 16 rotates, it can drive the connecting The rod 17 rotates around the rotation axis. Since the connecting rod 17 is hinged with the station rocker 15, and the station rocker 15 is connected and fixed with the station swing shaft 8, the connecting rod 17 controls the station rocker 15 and the station swing shaft 8. It swings back and forth around the rotation axis of the station swing shaft 8 . The distance between the connection and the rotation axis of the station crank disc 16 is the crank, the maximum swing angle required by the station swing arm 6, the conditions for the existence of the crank in the crank rocker mechanism 14, the minimum transmission angle γmin and the stroke speed change The coefficient K designs the specific dimensions of each component of the crank-rocker mechanism 14, including the maximum length dmax of the crank d, the length of the connecting rod 17, the length of the station rocker 15, the rotation axis of the station crank plate 16 and the station swing shaft 8. The specific requirements for the distance between the rotation axes are: the minimum transmission angle of the crank-rocker mechanism 14 γmin≥50°; the stroke speed variation coefficient of the crank-rocker mechanism 14 K≈1; the maximum length dmax of the crank d is the above four dimensions medium minimum. The diameter of the station crank disc 16 is determined according to the maximum length dmax of the crank d. Each component is made of 45# steel, and the theoretical size machining accuracy of the connecting rod 17 and the station rocker 15 is less than or equal to 0.05mm. The hinge is connected with the connecting rod 17 and can rotate freely, and the T-bolt can freely slide in the T-slot to adjust the length of the crank d. As for the station crank plate 16 and the station drive motor 13 should also be connected through the reducer 18, here the reducer 18 can be a worm gear reducer, the transmission direction of the station drive motor 13 can be changed, and the station drive motor 13 A three-phase asynchronous motor can be used.

Further, the stage driving mechanism 4 includes a stage driving motor 19 and a main shaft 20, wherein the main shaft 20 is vertically arranged on the rotation axis of the workpiece carrying table 1, and the workpiece carrying table 1 is installed on the top of the main shaft 20, and the stage driving The motor 19 drives the main shaft 20 to rotate, and then the main shaft 20 drives the workpiece carrier 1 to rotate synchronously. The main shaft 20 and the workpiece carrying platform 1 are connected by a Morse taper 3# transition joint, which is convenient for disassembly and assembly. The workpiece carrying table 1 is made of 45# steel. The table surface of the workpiece carrying table 1 is provided with two T-shaped grooves that are perpendicular to each other through the center. The optical element 3 to be processed is fastened by the T-shaped groove bolts and the top block. The workpiece carrying table 1 The specific size depends on the maximum workpiece size processed by the processing device. The carrier drive motor 19 and the main shaft 20 are driven by the belt 24. Specifically, the bottom of the main shaft 20 is provided with a driven wheel 21. The carrier drive motor 19 is connected to the driving wheel 23 through the speed reducer 22, and the driving wheel 23 is connected to the driven wheel. 21 is driven by a belt 24, and the reducer 22 here also adopts a worm gear reducer.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. The utility model provides an optical element duplex position processingequipment, includes work piece plummer and two station processing agency, its characterized in that: the workpiece polishing device comprises a workpiece bearing table, a station swing arm and a station driving assembly, wherein the workpiece bearing table is used for bearing workpieces, the station driving mechanism is used for driving the workpiece bearing table to rotate around the axis of the workpiece bearing table, the station processing mechanism comprises a station polishing disc used for polishing the workpieces on the workpiece bearing table, one end of the station swing arm is fixedly connected with the station polishing disc, the station driving assembly can control the station swing arm to rotate, the rotation axis of the station swing arm is parallel to the rotation axis of the workpiece bearing table, and the two station polishing discs are positioned on two stations of aspheric surface elements on the workpiece bearing.

2. The optical element double station processing device of claim 1, wherein: the station swing arm is horizontally arranged and located above the workpiece bearing table.

3. The optical element double station processing device of claim 1, wherein: the station machining mechanism further comprises a station swing shaft driven by the station driving assembly to rotate around the axis of the station swing shaft, the station swing shaft is vertically arranged, and the station swing arm is arranged on the station swing shaft.

4. The optical element double station processing device of claim 3, wherein: station processing agency still includes can follow the synchronous rotatory voltage regulator of station pendulum shaft, just the voltage regulator with the coaxial setting of station pendulum shaft, the voltage regulator is including the bracing piece that can follow vertical direction and remove, the station swing arm is kept away from the one end of station polishing dish is installed the top of bracing piece.

5. The optical element double station processing device of claim 3, wherein: the station driving assembly comprises a station driving motor, and the station driving motor is in transmission connection with the station swing shaft through a crank rocker mechanism.

6. The optical element double station processing device of claim 5, wherein: the crank rocker mechanism comprises a station rocker connected with the station rocker shaft key and a station crank disc which is driven by the station rocker through a connecting rod and driven to rotate by the station driving motor, one end of the connecting rod is hinged with the station rocker, the other end of the connecting rod is connected with a T-shaped groove of the station crank disc, and the joint of the connecting rod and the station crank disc deviates from the rotation center of the station crank disc.

7. The optical element double station processing device of claim 6, wherein: the distance between the connecting position between the station crank disc and the connecting rod and the rotating axis of the station crank disc is a crank, and the maximum size of the crank is smaller than the length of the connecting rod, the length of the station rocker, and the distance between the rotating axis of the station crank disc and the rotating axis of the station pendulum shaft.

8. The optical element double station processing device of claim 5, wherein: the transmission angle of the crank rocker mechanism is not less than 50 degrees.

9. The optical element double station processing device of claim 1, wherein: the platform driving mechanism comprises a platform driving motor, the workpiece bearing platform is supported by a main shaft, the main shaft is positioned on a rotating axis of the workpiece bearing platform, and the platform driving motor is in transmission connection with the main shaft through a belt.

10. The optical element double station processing device of claim 1, wherein: the station polishing disc is connected with the end part of the station swing arm through a thimble, and the thimble is positioned right above the station polishing disc.

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