Polishing tool and fluoride crystal ball cover machining process

Abstract

The invention discloses a polishing tool and a fluoride crystal ball cover machining process, the polishing tool comprises a grinding tool, a clamp and a polishing leather, the grinding tool comprises an upper grinding tool and a lower grinding tool which are matched with each other, the clamp is arranged at the edge of the upper grinding tool, the polishing leather and a ball cover are fixed through the clamp, and the polishing leather is arranged between the upper grinding tool and the ball cover. And ball cover machining of the high-purity fluoride crystal is achieved through ball opening, accurate grinding and application of a polishing tool. The implementation process has the advantages of reliable machining process, high machining efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of dome processing, and particularly relates to a polishing tooling and a fluoride crystal dome processing technology. Background Art

[0002] Currently, optical domes on the market mainly use materials such as BK7, sapphire, fused silica, germanium, zinc selenide, etc. These materials have low absorption rates in the far-infrared band, cannot ensure the minimization of signal distortion, do not allow the infrared seeker of a missile to accurately transmit the thermal radiation signal of the target through the dome, and may cause optical distortion.

[0003] Existing processing technologies do not have grinding processing technologies for soft and brittle crystal materials. When using traditional mechanical grinding hard abrasive grains (such as diamond), it is easy to cause brittle domain fracture, the depth of the surface or subsurface damage layer is large (in the order of several micrometers), and long-time polishing is required for repair. Anisotropy leads to significant differences in the removal rates of different crystal planes, making it difficult to control the spherical surface profile accuracy. The processing process has low efficiency, a long processing cycle, and high costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a polishing tooling, a fluoride crystal dome processing technology and an operation method, so as to solve one or more of the above-mentioned existing technical problems.

[0005] The present invention provides a polishing tooling, including a grinding tool, a fixture and a polishing leather. The grinding tool includes an upper grinding tool and a lower grinding tool that are mutually adapted. A fixture is provided at the edge of the upper grinding tool, and the polishing leather and the dome are fixed through the fixture. The polishing leather is arranged between the upper grinding tool and the dome.

[0006] In some embodiments, a grinding groove is provided on the upper part of the lower grinding tool, and the upper grinding tool, the polishing leather, the fixture and the dome are all embedded in the grinding groove.

[0007] In some embodiments,

[0008] the materials of the upper grinding tool and the lower grinding tool are aerospace aluminum alloy;

[0009] the material of the fixture is stainless steel;

[0010] the material of the polishing leather is polyurethane

[0011] In some embodiments,

[0012] the top of the upper grinding tool is connected to the ejector pin of the polishing device, and the polishing device drives the upper die grinding tool, the fixture, the polishing leather and the dome to swing or rotate through the ejector pin;

[0013] the bottom of the lower grinding tool is connected to the frame of the polishing device.

[0014] In some embodiments,

[0015] the material of the thimble is tungsten steel;

[0016] The bottom of the lower mold is connected to the frame of the polishing device by a thread.

[0017] A processing technology for a fluoride crystal ball cover includes the following steps:

[0018] Select raw materials;

[0019] Open the ball;

[0020] Fine grinding;

[0021] Polish, and perform a polishing operation using the polishing tooling described in any one of the above.

[0022] In some embodiments, the selected raw material is the raw material for the selected ball cover, and the raw material for the ball cover is a high-purity fluoride crystal.

[0023] In some embodiments, the ball opening process is to select a cylindrical blank material with a numerical control milling ball machine, and first open the concave surface and then the convex surface to form a primary product.

[0024] In some embodiments, after the ball opening is completed, the formed primary product will be rough ground and then fine ground.

[0025] In some embodiments, during the polishing process, a swing curve is preset as needed in the control program of the polishing device connected to the polishing tooling, so that the thimble of the polishing device drives the upper mold, the polishing leather, the fixture and the ball cover to perform a regular swing movement according to the preset swing curve.

[0026] The advantages of the processing technology for the fluoride crystal ball cover of the present invention are as follows:

[0027] The regular swing movement of the thimble of the polishing device fixed on the robotic arm drives the upper mold, the polishing leather, the fixture and the ball cover to achieve the surface shape control of the ball cover, ensuring that the inner surface of the ball cover conforms to the curved surface optical design, reducing the wavefront aberration, and avoiding affecting the transmission of infrared or laser guidance signals; by padding the polishing leather in the gap between the lower side of the mold and the crystal ball cover, the flexible contact surface can avoid crystal damage and prevent subsurface cracks or micro-chipping;

[0028] The upper grinding tool, polishing pad and fixture are adapted to the outer cavity curved surface structure of the spherical cover, and the movement track is an adjustable swing curve. The polishing device can control the movement track of the polishing device through NC numerical control programming codes to ensure uniform polishing in the whole area. The program and operation codes for controlling the movement track can be pre-embedded in the control program of the polishing device, improving the polishing efficiency. By fixing the movement track of the grinding tool and specially setting the track parameters according to different shapes, the movement track is realized by numerical control programming, so as to improve the processing efficiency and surface consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the mechanism of the polishing tooling in some embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Combined with Figure 1 As shown in the figure, in this embodiment, a polishing tooling is proposed. The polishing tooling includes a grinding tool made of aerospace aluminum alloy (aerospace aluminum alloy is aluminum profile for aerospace), a fixture 3 (stainless steel), and a polishing pad 2 (polyurethane). The grinding tool includes a matching upper grinding tool 1 and a lower grinding tool 4. A reserved hole 101 is provided at the top of the upper grinding tool 1 as a terminal hole for connecting the thimble on the polishing device, and the material of the thimble can be tungsten steel; a layer of polishing pad 2 is padded between the lower side of the grinding tool 1 and the contact surface of the spherical cover 5. A fixture 3 is provided at the edge of the upper grinding tool 1, and a connection is formed between the spherical cover 5 and the upper grinding tool 1 through the fixture 3. A grinding groove is provided on the upper part of the lower grinding tool 4. When the polishing tooling works, the upper grinding tool 1, the polishing pad 2, the fixture 3, and the spherical cover 5 are all embedded in the grinding groove. Threads (such as: M16 threads) can be added to the lowermost part of the lower grinding tool 4 to form a connection with the frame of the polishing device. Thus, the purpose of fixing the whole polishing tooling on the body of the polishing device is achieved.

[0031] The above-mentioned polishing device can be a traditional swing machine. At this time, the lowermost part of the lower grinding tool 4 can be screwed onto the machine plane under the thimble to form a fixation. In addition to the swing machine described above, the polishing device can also be other existing devices that can achieve the above structure and operation effect.

[0032] In some specific implementation manners, at least two fixtures 3 are provided on the upper grinding tool 1. Generally, these fixtures 3 are circumferentially and evenly arranged around the center of the upper grinding tool 1. The fixture 3 can be connected to the upper grinding tool 1 in one or more ways such as a telescopic member, an adjustable connecting member (such as: bolts, etc.), so as to realize the adjustability of the distance from the outer end of the fixture 3 to the central axis of the upper grinding tool 1. The vertical section of the fixture 3 (such as Figure 1 shown), an extension protrusion is provided at the bottom of the outer end of the fixture 3, and the position from the extension protrusion to the central axis of the upper grinding tool 1 corresponds to the position of the top of the spherical cover 5, so as to achieve the purpose of clamping and fixing the spherical cover 5.

[0033] On the polishing device connected to the polishing tooling, the movement trajectory of the polishing device can be controlled by NC numerical control programming code, and the movement trajectory can be a swing curve. Before the polishing device runs, the program and operation code for controlling the movement trajectory can be pre-loaded into the control program of the polishing device, so that the ejector pin of the polishing device drives the upper grinding tool, polishing leather, fixture and ball cover to move according to the preset movement trajectory.

[0034] A processing technology for a fluoride crystal ball cover includes the following steps:

[0035] Select raw materials, which can be high-purity fluoride crystals with excellent optical transmittance and heat resistance;

[0036] For ball opening, use a numerical control ball milling machine (LSG200) to select cylindrical blank materials, first open the concave surface and then the convex surface; for fine grinding, use a spherical surface fine grinding machine (SP330) to grind with a fine grinding wheel;

[0037] Polishing, use the above-mentioned polishing tooling to perform polishing operations on the outer curved surface of the ball cover 5. All the above undisclosed matters can be realized by existing technologies, so they will not be elaborated here.

[0038] The above are only some embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present invention, several similar deformations and improvements can be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A polishing tooling, characterized in that, The polishing tooling includes a grinding tool, a fixture and a polishing leather. The grinding tool includes an upper grinding tool and a lower grinding tool which are adapted to each other. A fixture is provided at the edge of the upper grinding tool. The polishing leather and the ball cover are fixed by the fixture. The polishing leather is disposed between the upper grinding tool and the ball cover.

2. A polishing tooling according to claim 1, characterized in that, A grinding groove is provided on the upper part of the lower grinding tool. The upper grinding tool, the polishing leather, the fixture and the ball cover are all embedded in the grinding groove.

3. A polishing tooling according to claim 1, wherein the materials of the upper grinding tool and the lower grinding tool are aerospace aluminum alloy; the material of the fixture is stainless steel; the material of the polishing leather is polyurethane.

4. A polishing tooling according to claim 1, wherein the top of the upper grinding tool is connected to the ejector pin of the polishing device. The polishing device drives the upper die grinding tool, the fixture, the polishing leather and the ball cover to swing or rotate through the ejector pin; the bottom of the lower grinding tool is connected to the frame of the polishing device.

5. A polishing tooling according to claim 4, wherein the material of the ejector pin is tungsten steel; the bottom of the lower grinding tool is connected to the frame of the polishing device by threads.

6. A processing technology for a fluoride crystal dome, characterized in that, It includes the following steps: Select raw materials; Open the ball; Fine grinding; Polishing, and the polishing operation is carried out by using the polishing tooling according to any one of claims 1 to 5.

7. The processing technology of the fluoride crystal dome according to claim 6, characterized in that, The selected raw material is the raw material of the ball cover, and the raw material of the ball cover is high-purity fluoride crystal.

8. The processing technology of the fluoride crystal dome according to claim 6, characterized in that, The process of opening the ball is to select a cylindrical blank material with a numerical control milling ball machine, and first open the concave surface and then the convex surface to form a primary product.

9. The fluoride crystal dome processing method according to claim 8, characterized in that, After the ball opening is completed, the formed primary product will be rough ground and then fine ground.

10. The processing technology of the fluoride crystal dome according to claim 6, characterized in that, During the polishing process, a swing curve is preset as required in the control program of the polishing device connected to the polishing tooling, so that the ejector pin of the polishing device drives the upper grinding tool, the polishing leather, the fixture and the ball cover to perform regular swing movement according to the preset swing curve.

Images