Turning device for spherical grating

Abstract

A turning machining device for a spherical grating comprises a rotary motion shaft, an X-axis linear motion module capable of driving the rotary motion shaft to move in the X direction is installed below the rotary motion shaft, and a tool plate used for fixing a spherical grating piece to be machined is fixedly installed on the end face of the rotary motion shaft. A Z-axis linear motion module perpendicular to the X-axis linear motion module is arranged on one side of the X-axis linear motion module, a rotating module capable of rotating in the horizontal direction is installed on the Z-axis linear motion module, a first tool rest and a second tool rest which are linearly arranged are installed on the rotating module, a rough turning tool is installed on the first tool rest, and a rough turning tool is installed on the second tool rest. A finish turning tool is installed on the second tool rest. Compared with a traditional chemical etching method, the machining device for the spherical grating has the advantages of being low in cost and easy to operate when used for machining the spherical grating, and the machining efficiency of large-breadth spherical gratings can be improved while the machining precision is guaranteed; the method has the advantage of effectively simplifying the spherical grating manufacturing process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of spherical grating processing, especially a turning processing device of spherical grating. BACKGROUND

[0002] Grating is an optical device composed of a large number of parallel slits with equal width and equal spacing. Based on the diffraction principle of the slits, grating has a wide range of applications in the fields of spectrometer, optical information processing, optical communication and precision measurement. Spherical grating is the direction of today's technology development. Spherical grating can actually be understood as a group of spherical crown convex lens arrays arranged on the surface of a transparent sheet. It can make your vision see stereoscopic images in all directions. It has a wider application prospect. The groove section of the cylindrical blazed grating is triangular, periodically distributed and closely arranged, and has the problems of difficult processing, high cost and small size. At present, most of the cylindrical grating production at home and abroad uses photoetching technology, while the domestic grating processing technology is relatively backward. The used etching exposure technology is photoetching on the surface of the workpiece coated with a photosensitive film layer, and then developing, etching and other processes are needed, which has low work efficiency, no detection function, toxic production process and environmental pollution. Moreover, this process can only be used for the manufacture of planar gratings and cannot be used for the processing of spherical gratings. In view of the defects of the prior art, a new spherical grating processing device is needed to reduce the processing difficulty and cost of spherical grating. SUMMARY

[0003] The utility model aims at overcoming the defects of prior art, providing a kind of turning processing device of spherical grating to solve the technical problems raised in the above background.

[0004] The utility model aims at overcoming the defects of prior art, providing a kind of turning processing device of spherical grating to solve the technical problems raised in the above background.

[0005] A kind of turning processing device of spherical grating, including rotary motion shaft, the rotary motion shaft below is equipped with the X-axis linear motion module that can drive rotary motion shaft along X direction movement, rotary motion shaft's end surface is fixedly installed with the tool plate for fixing the spherical grating piece to be processed, the side of X-axis linear motion module is provided with the Z-axis linear motion module that is arranged perpendicular to X-axis linear motion module, the Z-axis linear motion module is installed with the rotary module that can rotate along horizontal direction, the rotary module is installed with the first tool rest and second tool rest that are linearly arranged, the first tool rest is installed with rough turning tool, the second tool rest is installed with finish turning tool, the tool tip angle of rough turning tool and finish turning tool is α, and the tool tip of rough turning tool is provided with fillet with radius R, wherein, α=(0.8-0.9) θ;R=(0.8-0.9) r, θ is the grating angle of spherical grating;R is the inscribed circle of grating structure.

[0006] Further, the rotation center of the tool plate and the rotation center of the rotation movement shaft are on the same axis.

[0007] Further, the tool plate is fixedly installed on the end face of the rotation movement shaft through the first bolt, and the spherical grating piece to be processed is fixedly installed on the tool plate through the second bolt.

[0008] Further, the rough turning tool and the fine turning tool are fixed on the first tool holder and the second tool holder respectively through the adjusting bolt.

[0009] Further, the X-axis linear motion module and the Z-axis linear motion module are both full-closed stepping linear modules.

[0010] The beneficial effects of the present application are:

[0011] The machining device for spherical grating provided by the present application has the advantages of low cost and easy operation compared with the traditional chemical etching method when machining the spherical grating, and can improve the machining efficiency of large-format spherical grating while ensuring the machining precision. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present application;

[0013] Figure 2 It is a structural schematic diagram of the rough turning tool of the present application;

[0014] Figure 3 It is a structural schematic diagram of the fine turning tool mechanism of the present application;

[0015] Figure 4 It is a structural schematic diagram of the spherical grating piece connection structure of the present application;

[0016] Figure 5 It is a structural schematic diagram of the spherical grating piece of the present application;

[0017] Figure 6 It is a structural schematic diagram of the tool setting structure of the present application.

[0018] In the figure, 1 is a rotation movement shaft, 2 is an X-axis linear motion module, 3 is a spherical grating piece, 4 is a tool plate, 5 is a Z-axis linear motion module, 6 is a rotation module, 7 is a first tool holder, 8 is a second tool holder, 9 is a rough turning tool, 10 is a fine turning tool, 11 is a first bolt, 12 is a second bolt, and 13 is an adjusting bolt. DETAILED DESCRIPTION

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] Example:

[0022] A turning apparatus for spherical gratings, see attached document. Figure 1 As shown, the system includes a rotary motion shaft 1, below which is mounted an X-axis linear motion module 2 capable of driving the rotary motion shaft 1 to move along the X direction. A fixture plate 4 for fixing the spherical grating component 3 to be processed is fixedly mounted on the end face of the rotary motion shaft 1. The rotation center of the fixture plate 4 and the rotation center of the rotary motion shaft 1 are on the same axis. (See attached diagram.) Figure 4 As shown, the tooling plate 4 is fixedly mounted on the end face of the rotating motion shaft 1 by the first bolt 11, and the spherical grating part 3 to be processed is fixedly mounted on the tooling plate 4 by the second bolt 12.

[0023] Please refer to the appendix for further details. Figure 1 As shown, a Z-axis linear motion module 5 is arranged perpendicularly to the X-axis linear motion module 2 on one side. A rotary module 6 capable of rotating horizontally is mounted on the Z-axis linear motion module 5. The X-axis linear motion module 2, Z-axis linear motion module 5, and rotary module 6 are all part of a commercially available high-precision five-axis motion device. Furthermore, to ensure better rigidity of the linear modules during use and to prevent chip damage, both the X-axis linear motion module 2 and the Z-axis linear motion module 5 are fully enclosed stepper linear modules. A first tool post 7 and a second tool post 8, arranged linearly to each other, are mounted on the rotary module 6. A roughing tool 9 is mounted on the first tool post 7, and a finishing tool 10 is mounted on the second tool post 8. The roughing tool 9 and the finishing tool 10 are fixed to the first tool post 7 and the second tool post 8, respectively, by adjusting bolts 13. (See appendix) Figure 2 and attached Figure 3As shown, the tool tip angle of the rough turning tool 9 and the fine turning tool 10 is α, and the tool tip of the rough turning tool 9 is provided with a fillet with a radius R, wherein α=(0.8-0.9)θ; R=(0.8-0.9)r. Refer to the attached Figure 5 As shown, θ is the grating angle of the spherical grating; H is the grating groove depth, D is the grating constant, and r is the radius of the inscribed circle of the grating structure. Wherein, r=H(sinθ / 2).

[0024] Specific to the implementation process, the inscribed circle radius of the spherical grating is calculated according to the grating angle θ of the spherical grating to be machined and the groove depth H of the spherical grating. The tool tip angle α of the rough turning tool 9 and the fine turning tool 10 and the tool tip fillet radius R of the rough turning tool 9 are designed and calculated according to the above data, and the rough turning tool 9 and the fine turning tool 10 are designed according to the calculated data. During processing, the spherical grating piece 3 blank to be machined is fixedly installed on the end face of the rotary motion shaft 1 through the tooling plate 4, and the X-axis linear motion module 2 and the Z-axis linear motion module 5 are adjusted, as shown in the attached Figure 6 As shown, the rough turning tool 9 is aligned to the side surface of the spherical grating piece 3 blank to be machined, and the tool setting is performed on the rough turning tool 9 and the spherical grating piece 3 blank to be machined by using the alignment instrument. The height of the rough turning tool 9 is adjusted by the adjusting screw 12 on the first tool holder 7 to ensure that the center height of the rough turning tool 9 and the center of the spherical grating piece 3 blank to be machined are at the same height. The spherical grating piece 3 blank to be machined is turned for rough machining by referring to the two-dimensional theoretical profile of the spherical grating element. After completion, the rotary module 6 is rotated by 180°, the fine turning tool 10 required for fine machining is switched, and the spherical grating to be machined is turned for fine machining according to the grating groove depth H, the grating constant D and the two-dimensional theoretical profile line of the spherical grating element to be machined. Finally, the spherical grating element is measured by using the interferometer to determine the compensation machining amount, and the grating element is compensated. Finally, the spherical grating meeting the requirements is obtained.

[0025] The above-described embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A turning apparatus for spherical gratings, characterized in that, The application relates to a ball surface grating machining device, which comprises a rotary motion shaft, an X-axis linear motion module arranged below the rotary motion shaft and capable of driving the rotary motion shaft to move along the X direction, a tool plate fixedly arranged on the end surface of the rotary motion shaft and used for fixing a ball surface grating piece to be machined, a Z-axis linear motion module arranged on one side of the X-axis linear motion module and perpendicular to the X-axis linear motion module, a rotary module arranged on the Z-axis linear motion module and capable of rotating along the horizontal direction, a first tool holder and a second tool holder linearly arranged on the rotary module, a rough turning tool arranged on the first tool holder, a fine turning tool arranged on the second tool holder, and a round angle with a radius R arranged on the cutting edge of the rough turning tool, wherein alpha=(0.8-0.9)theta; R=(0.8-0.9)r, theta is the grating angle of the ball surface grating, and r is the inscribed circle of the grating structure.

2. A turning device of a spherical grating according to claim 1, wherein The rotation center of the tool plate and the rotation center of the rotary motion shaft are arranged on the same axis.

3. The turning device of a spherical grating according to claim 1, wherein The tool plate is fixedly arranged on the end surface of the rotary motion shaft through first bolts, and the ball surface grating piece to be machined is fixedly arranged on the tool plate through second bolts.

4. The turning device of a spherical grating according to claim 1, wherein The rough turning tool and the fine turning tool are respectively fixed on the first tool holder and the second tool holder through adjusting bolts.

5. The turning device of a spherical grating according to claim 1, wherein The X-axis linear motion module and the Z-axis linear motion module are both full-closed stepping linear modules.

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