CN108051880B - Method for processing metal multi-face scanning prism - Google Patents

Method for processing metal multi-face scanning prism Download PDF

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Publication number
CN108051880B
CN108051880B CN201711298055.5A CN201711298055A CN108051880B CN 108051880 B CN108051880 B CN 108051880B CN 201711298055 A CN201711298055 A CN 201711298055A CN 108051880 B CN108051880 B CN 108051880B
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CN
China
Prior art keywords
electric control
rotating shaft
metal
scanning
standard block
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CN201711298055.5A
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Chinese (zh)
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CN108051880A (en
Inventor
黄启泰
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苏州大学
苏州斑马光学技术有限公司
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Priority to CN201711298055.5A priority Critical patent/CN108051880B/en
Publication of CN108051880A publication Critical patent/CN108051880A/en
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/04Prisms
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00Severing cooled glass
    • C03B33/02Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor

Abstract

The invention discloses a method for processing a metal multi-face scanning prism, belongs to the technical field of optical processing, and particularly relates to a method for processing a multi-face scanning prism, aiming at solving the problem of low angle precision between each face when the multi-face scanning prism is processed in the prior art. The use of the technical scheme can be independent of a high-precision numerical control rotating shaft, the processing of the metal multi-surface scanning prism can be completed on a two-shaft machine tool, and the processing efficiency, the processing precision and the processing consistency are greatly improved.

Description

Method for processing metal multi-face scanning prism

Technical Field

The invention belongs to the technical field of optical processing, and particularly relates to a processing method of a multi-surface scanning prism.

Background

The polygon mirror has a plurality of reflecting surfaces, and is a core optical device in a laser apparatus such as a scanner, a copier, and a scanner. When the laser scanning device is used, the laser scanning device is usually arranged on a rotating shaft of a motor, laser beam scanning with large range, ultrahigh speed, high precision and high repeatability can be realized through high-speed rotation of the multi-surface scanning prism, and factors such as angle precision, surface quality and the like directly influence the scanning precision and effect, so that the requirement on the angle processing precision of each reflecting surface is very high.

At present, the processing of the domestic multi-surface scanning prism is mainly realized by a numerical control lathe with a rotating shaft, the number of the processed multi-surface scanning prisms at one time is limited, the angle precision between each surface is guaranteed by the precision of the numerical control rotating shaft, and the problems of low processing efficiency, difficult control of cost, poor angle precision and poor scanning effect are brought; in addition, the consistency of products is poor during batch processing, and the stability of assembly equipment is seriously influenced.

Disclosure of Invention

The invention aims to solve the problem that the angle precision between the surfaces of the multi-surface scanning prism in the prior art is difficult to control.

A processing method of a metal multi-surface scanning prism has the following specific technical scheme:

1) and (3) processing a standard block: processing a polygon prism with precision superior to the design parameters of the metal polygon scanning prism as a standard block;

2) the standard block is fixedly arranged on a rotating shaft of the electric control rotary table, wherein the normal direction of the cross section of the standard block is parallel to the rotating shaft of the electric control rotary table;

3) clamping a metal multi-surface scanning prism mirror blank to be processed on a rotating shaft of the electric control rotary table, wherein the normal direction of the cross section of the metal multi-surface scanning prism mirror blank is parallel to the rotating shaft of the electric control rotary table;

4) building an auto-collimation light path on a machine tool, installing an electric control rotary table on a machine tool workbench, rotating the electric control rotary table, aligning any one side surface of the standard block with the auto-collimation light path, and fixing a rotating shaft of the electric control rotary table by using a locking mechanism; turning a scanning surface on the metal multi-surface scanning prism mirror blank;

5) and rotating the electric control rotary table, sequentially aligning other side surfaces of the standard block to the auto-collimation light path, and turning the rest scanning surfaces on the metal multi-surface scanning prism lens blank.

The machine tool of the processing method can be completed by using the fly cutter turning technology of a two-axis or more single-point diamond lathe. In order to reduce the cutting amount, the metal polyhedral scanning prism lens blank can be firstly made into a metal polyhedron with the angle error smaller than 2 degrees, and then the metal polyhedron can be directly turned into an optical surface by using a diamond fly cutter turning technology according to the technical scheme.

According to the technical scheme, the metal multi-surface scanning prism can be directly obtained through a cutting process after a longer metal multi-surface scanning prism mirror blank is turned and all side surfaces of the strip are machined.

In the above technical scheme: the standard block is a glass multi-face prism with precision superior to the design parameters of a metal multi-face scanning prism.

In the above technical scheme: the glass multi-face prism can be processed by adopting a conventional cold processing method, and the angle error and the tower difference between the surfaces are strictly controlled when the standard block is processed.

In the above technical scheme: the standard block is provided with a through hole, and the through hole on the standard block is assembled and fixed in a coaxial mode with a rotating shaft of the electric control turntable.

In the above technical scheme: the metal multi-surface scanning rotating mirror blank to be processed is also provided with a through hole which penetrates through a rotating shaft of the electric control rotating table.

In the above technical scheme: the auto-collimation light path is an auto-collimation parallel light tube.

The preferred scheme is as follows: the auto-collimation light path consists of a parallel light laser, a spectroscope, a plane reflector and an image screen, wherein parallel light emitted by the parallel light laser is incident to the spectroscope, light reflected by the spectroscope is used as reference light and is reflected by the plane reflector vertically placed in a light path and then is incident to the image screen, and light transmitted by the spectroscope is used as detection light and is incident to any one side surface of the standard block; and rotating the electric control turntable, and reflecting the detection light to the image screen by the side surface to form interference fringes on the image screen. The optical path is actually a Michelson interference optical path, and the rotating shaft corner of the electric control turntable can be controlled more accurately through interference fringes.

The CCD can be used for replacing an image screen, interference fringes of the reference light and the detection light are imaged in the CCD, and the change of the interference fringes is monitored in real time in the whole processing process. Therefore, whether the rotating shaft of the electric control rotary table rotates or not can be observed more conveniently in the machining process.

And when the lathe is used for turning, the real-time change information of the interference fringes can be fed back to the lathe for error real-time compensation. The processing belongs to a closed-loop processing technology, the change of interference fringes can be converted into the posture change of a rotating shaft of the electric control rotary table, the real-time change information is fed back to a processing machine tool, and the processing precision can be further improved.

In order to adapt to batch processing, the more preferable scheme is as follows: in the above technical solution, the rotating shaft of the electric control turntable in step 2) is connected to a plurality of driven rotating shafts through a linkage mechanism, each driven rotating shaft can be clamped with at least one metal multi-surface scanning prism lens blank, and when the rotating shaft of the electric control turntable rotates, the driven rotating shafts also rotate at the same angle; clamping a plurality of metal multi-surface scanning prism lens blanks to be processed on the driven rotating shaft simultaneously in the step 3); rotating the electric control turntable in the step 4), aligning any one side surface of the standard block with an auto-collimation light path, and fixing a rotating shaft and all driven rotating shafts of the electric control turntable by using a locking mechanism; and turning scanning surfaces on metal multi-surface scanning prism mirror blanks fixed on a rotating shaft and a driven rotating shaft of the electric control turntable. Therefore, a plurality of metal multi-surface scanning prism lens blanks to be processed can be installed on each rotating shaft, and a plurality of driven rotating shafts can be connected through a linkage device, so that batch processing can be realized, the same batch of products can be guaranteed to be consistent in precision, and the stability of the assembled products is greatly improved.

Drawings

FIG. 1 is a schematic view of a metal polygon scanning prism;

FIG. 2 is a schematic view of a multi-axis batch processing metal polygon scanning prism;

FIG. 3 is a schematic diagram of an auto-collimation optical path;

wherein: the method comprises the following steps of 1-an electric control turntable, 2-a standard block, 3-a metal multi-surface scanning prism mirror blank, 4-a rotating shaft of the electric control turntable, 5-an auto-collimation light path, 6-an electric control turntable support, 7-a locking mechanism, 8-a linkage mechanism, 9-a driven rotating shaft, 10-a parallel light laser, 11-a spectroscope, 12-reference light, 13-detection light, 14-a plane reflector and 15-an image screen.

Detailed Description

For the purpose of more clearly illustrating the invention, further description is made below with reference to the accompanying drawings and examples

The first embodiment is as follows:

the processing method of the metal multi-surface scanning prism shown in the attached figure 1 has the following specific technical scheme:

1) and (3) processing a standard block: processing a polygon prism with precision superior to the design parameters of the metal polygon scanning prism as a standard block 2;

2) the standard block is fixedly arranged on a rotating shaft 4 of the electric control rotary table 1, wherein the normal direction of the cross section of the standard block is parallel to the rotating shaft of the electric control rotary table;

3) clamping a metal multi-surface scanning prism mirror blank 3 to be processed on a rotating shaft of the electric control rotary table, wherein the normal direction of the cross section of the metal multi-surface scanning prism mirror blank is parallel to the rotating shaft of the electric control rotary table;

4) building an auto-collimation light path 5 on a machine tool, installing an electric control rotary table on a machine tool workbench, rotating the electric control rotary table, aligning any one side surface of the standard block with the auto-collimation light path, and fixing a rotating shaft of the electric control rotary table by using a locking mechanism; turning a scanning surface on the metal multi-surface scanning prism mirror blank;

5) and rotating the electric control rotary table, sequentially aligning other side surfaces of the standard block to the auto-collimation light path, and turning the rest scanning surfaces on the metal multi-surface scanning prism lens blank.

Example two:

the processing method of the metal multi-surface scanning prism shown in the attached figure 2 has the following specific technical scheme:

1) and (3) processing a standard block: processing a polygon prism with precision superior to the design parameters of the metal polygon scanning prism as a standard block 2;

2) the standard block is fixedly arranged on a rotating shaft 4 of the electric control rotary table 1, wherein the normal direction of the cross section of the standard block is parallel to the rotating shaft of the electric control rotary table; a rotating shaft 4 of the electric control turntable 1 is connected with a plurality of driven rotating shafts 9 through a linkage mechanism 8, each driven rotating shaft can be clamped with at least one metal multi-surface scanning prism lens blank 3, and when the rotating shaft of the electric control turntable rotates, the driven rotating shafts also rotate by the same angle;

3) clamping a plurality of metal multi-surface scanning prism lens blanks to be processed on the driven rotating shaft; the normal direction of the cross section of the metal multi-surface scanning prism lens blank is parallel to a rotating shaft of the electric control rotary table;

4) building an auto-collimation light path 5 on an electric control rotary table support 6, mounting the electric control rotary table on a machine tool workbench, rotating the electric control rotary table, aligning any one side surface of the standard block with the auto-collimation light path, and fixing a rotating shaft and all driven rotating shafts of the electric control rotary table by using a locking mechanism 7; and turning scanning surfaces on metal multi-surface scanning prism mirror blanks fixed on a rotating shaft and a driven rotating shaft of the electric control turntable.

5) And rotating the electric control rotary table, sequentially aligning other side surfaces of the standard block to the auto-collimation light path, and turning the rest scanning surfaces on the metal multi-surface scanning prism lens blank.

Example three:

on the basis of the technical solution of the embodiment, the auto-collimation optical path 5 is as shown in fig. 3, and is composed of a parallel light laser 10, a beam splitter 11, a plane mirror 14, and an image screen 15, wherein parallel light emitted from the parallel light laser is incident to the beam splitter, light reflected by the beam splitter is reflected by the plane mirror vertically placed in the optical path as reference light 12 and then incident to the image screen, and light transmitted by the beam splitter is incident to any one side surface of the standard block as detection light 13; the electrically controlled turret is rotated and the detection light is reflected by the side to the image screen 15, forming interference fringes on the image screen. The optical path is actually a Michelson interference optical path, and the rotating shaft corner of the electric control turntable can be controlled more accurately through interference fringes.

The principle of the technical scheme is that the rotation angle of the rotating shaft is accurately controlled through the auto-collimation light path and the standard block, and the metal multi-surface scanning prism lens blank to be processed and the standard block are clamped on the same rotating shaft, so that the angle accuracy of each side surface of the standard block can be accurately copied. The use of the technical scheme can be independent of a high-precision numerical control rotating shaft, the processing of the metal multi-surface scanning prism can be completed on a two-shaft machine tool, and the processing efficiency, the processing precision and the processing consistency are greatly improved.

The technical scheme is not only suitable for the multi-face scanning prism, but also suitable for the multi-face special-shaped prism, for example, the side face of the prism is a spherical surface or an aspheric surface, in order to accurately control the optical axis direction of each face of the multi-face special-shaped prism, a standard block with each face being a plane and the optical axis angle of the multi-face special-shaped prism being the same as that of the multi-face special-shaped prism can be processed firstly, and the optical axis angle of the standard block is copied to the multi-face special.

The technical solution is not described in detail and belongs to the technology known to the skilled person.

Claims (10)

1. A method for processing a metal multi-face scanning prism comprises the following steps:
1) and (3) processing a standard block: processing a polygon prism with precision superior to the design parameters of the metal polygon scanning prism as a standard block;
2) the standard block is fixedly arranged on a rotating shaft of the electric control rotary table, wherein the normal direction of the cross section of the standard block is parallel to the rotating shaft of the electric control rotary table;
3) clamping a metal multi-surface scanning prism mirror blank to be processed on a rotating shaft of the electric control rotary table, wherein the normal direction of the cross section of the metal multi-surface scanning prism mirror blank is parallel to the rotating shaft of the electric control rotary table;
4) building an auto-collimation light path on a machine tool, installing an electric control rotary table on a machine tool workbench, rotating the electric control rotary table, aligning any one side surface of the standard block with the auto-collimation light path, and fixing a rotating shaft of the electric control rotary table by using a locking mechanism; turning a scanning surface on the metal multi-surface scanning prism mirror blank;
5) and rotating the electric control rotary table, sequentially aligning other side surfaces of the standard block to the auto-collimation light path, and turning the rest scanning surfaces on the metal multi-surface scanning prism lens blank.
2. The method of claim 1, wherein: the standard block is a glass multi-face prism with precision superior to the design parameters of a metal multi-face scanning prism.
3. The method of claim 2, wherein: the glass multi-face prism is processed by a cold processing method, and angle errors and tower difference among all surfaces are strictly controlled when the standard block is processed.
4. The method of claim 1, wherein: the standard block is provided with a through hole, and the through hole on the standard block is assembled and fixed in a coaxial mode with a rotating shaft of the electric control turntable.
5. The method of claim 4, wherein: the metal multi-surface scanning rotating mirror blank to be processed is also provided with a through hole which penetrates through a rotating shaft of the electric control rotating table.
6. The method for processing a metal polygon scanning prism according to any one of claims 1 to 5, wherein: the auto-collimation light path is an auto-collimation parallel light tube.
7. The method for processing a metal polygon scanning prism according to any one of claims 1 to 5, wherein: the auto-collimation light path consists of a parallel light laser, a beam expander, a spectroscope, a plane reflector and an image screen, wherein parallel light emitted by the parallel light laser is incident to the spectroscope after being subjected to beam expansion, light reflected by the spectroscope is incident to the image screen after being reflected by the plane reflector vertically placed in a light path as reference light, and light transmitted by the spectroscope is incident to any one side surface of the standard block as detection light; and rotating the electric control turntable, and reflecting the detection light to the image screen by the side surface to form interference fringes on the image screen.
8. The method of claim 7, wherein: the CCD is used for replacing an image screen, interference fringes of the reference light and the detection light are imaged in the CCD, and the change of the interference fringes is monitored in real time in the whole processing process.
9. The method of claim 8, wherein: and when the lathe is used for turning, feeding back the real-time change information of the interference fringes to the lathe for error real-time compensation.
10. The method for processing a metal polygon scanning prism according to any one of claims 1 to 5, wherein: the rotating shaft of the electric control turntable in the step 2) is connected with a plurality of driven rotating shafts through a linkage mechanism, each driven rotating shaft can be clamped with at least one metal multi-surface scanning prism lens blank, and when the rotating shaft of the electric control turntable rotates, the driven rotating shafts also rotate by the same angle; clamping a plurality of metal multi-surface scanning prism lens blanks to be processed on the driven rotating shaft simultaneously in the step 3); rotating the electric control turntable in the step 4), aligning any one side surface of the standard block with an auto-collimation light path, and fixing a rotating shaft and all driven rotating shafts of the electric control turntable by using a locking mechanism; and turning scanning surfaces on metal multi-surface scanning prism mirror blanks fixed on a rotating shaft and a driven rotating shaft of the electric control turntable.
CN201711298055.5A 2017-12-08 2017-12-08 Method for processing metal multi-face scanning prism CN108051880B (en)

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