A precision machining method for laser gyroscope cavity

Abstract

The present invention relates to the field of precision optical parts processing, and specifically to a precision processing method for a laser gyroscope cavity. The present invention first performs rough milling on the cavity in a parametric processing manner, and then releases residual stress in the processing process through multiple heat treatment processes during the processing, further improving the strength and hardness of the cavity, and providing a basis for the accuracy of subsequent processing. Secondly, the ground end face is used as a positioning reference for fine processing, ensuring the processing accuracy of the remaining views. Finally, the cavity is anodized to add a layer of oxide film to the cavity, thereby increasing the service life of the cavity, thereby achieving precision processing of the cavity. This method can effectively ensure the processing accuracy of each end face, each groove, and each positioning hole, and ensure the installation accuracy of the cavity and an external box body, as well as internal parts, electronic components, etc., thereby solving the problem of large processing errors in traditional processing methods.

Description

Technical Field

[0001] The present invention relates to the field of precision optical parts processing, and in particular to a precision processing method for a laser gyroscope cavity. Background Art

[0002] An optical gyroscope is a precision instrument that uses optical path difference to measure angular velocity (the Sagnac effect). Its principle is to interfere with two light beams traveling clockwise and counterclockwise in a closed optical path, emitted by the same source. By detecting the phase difference or changes in the interference fringes, the angular velocity of the closed optical path can be measured. It has replaced mechanical gyroscopes and is widely used in modern aviation, navigation, aerospace, and defense industries. Unlike other types of gyroscopes, laser gyroscopes lack rotating rotor components and angular momentum. They require no moving parts such as a steering ring frame, frame servo mechanism, rotating bearings, conductive rings, or sensors. Consequently, they offer advantages such as a simple structure, long service life, easy maintenance, and high reliability. Currently, resonant optical gyroscopes are a key development area in the gyroscope field. However, machining errors in the gyroscope's reflective surfaces, cavity structure, and lateral angular deformation of the mirrors can lead to non-coplanarity errors in the resonant cavity's closed circular optical path, limiting the gyroscope's accuracy.

[0003] In the prior art, the gyroscope cavity is typically produced through precision casting of aluminum alloys to obtain a rough blank. The outer surface of the cavity is then ground and polished, its end faces are machined, and the internal shape of the cavity is drilled and milled using the machined end faces as reference planes to ensure consistency between the cavity and the external structural dimensions. However, this processing method requires the machining personnel to have advanced processing skills and be proficient in applying anti-deformation measures. In addition, this method does not eliminate the processing stress during the processing, resulting in the accumulation of processing stress during the processing steps, which leads to the accumulation of processing errors, which is fatal for the processing of precision optical components. Therefore, there is a need to improve the processing method of the laser gyroscope cavity. Summary of the Invention

[0004] The purpose of the present invention is to provide a precision machining method for a laser gyroscope cavity, aiming to solve the problem of large machining errors in traditional machining methods.

[0005] To achieve the above-mentioned object, the present invention provides a precision machining method for a laser gyroscope cavity, which is applied to a laser gyroscope cavity. The cavity of the laser gyroscope comprises a front view end face, a front view cavity, a boss in the front view cavity, a weight reduction groove on the front view end face, a top view end face, a top view main cavity, a boss in the top view main cavity, a top view sub-cavity, a right view end face, a right view cavity, a boss in the right view cavity, a groove on the right view end face, a positioning hole on the right view end face groove, a left view end face, a weight reduction groove on the left view end face, a groove on the left view end face, a positioning hole on the left view end face groove, a bottom view end face, a weight reduction groove on the top view end face, a bottom view main cavity, a bottom view sub-cavity, a notch on the top view end face, a boss in the top view main cavity, a printed circuit board groove in the top view main cavity, a rear view end face, and a weight reduction groove on the rear view end face, the method comprising the following steps:

[0006] S1 pre-processes the cavity blank and then marks the cavity to obtain dimension lines;

[0007] S2: rough milling each surface, each hole and each weight-reducing groove of the cavity blank based on the dimension line;

[0008] S3: removing burrs generated by machining the surfaces, holes, and weight-reducing grooves, blunting the edges, and then performing heat treatment;

[0009] S4 uses the end face of the main view as the positioning surface, and performs semi-finishing processing on the grooves on the upper end faces of the left view and the right view and the positioning holes thereon;

[0010] S5: removing burrs generated after semi-finishing, blunting the edges of the cavity, subjecting the cavity to cryogenic treatment, and grinding the bottom view end face;

[0011] S6: positioning the bottom view end surface and performing milling on the main view cavity, the top view cavity, and the right view cavity;

[0012] S7 removes burrs generated after milling, blunts edges, taps all threads, and performs root cleaning around the front view cavity, the top view cavity, and the right view cavity;

[0013] S8 performs anodizing treatment on the surface of the processed cavity to obtain a laser gyroscope cavity.

[0014] The rough milling requirement is to retain the shape of the cavity, each surface and the weight-reducing groove with a margin of 1mm, and at the same time, all holes and waist-shaped holes except the threaded bottom hole have a single-side margin of 2mm.

[0015] The heat treatment temperature is 160±5°C and the holding time is 4 hours.

[0016] Among them, the semi-finishing should ensure that the depth allowance of the 8 grooves on the left view and the right view of the cavity and the radius allowance of the 8 positioning holes on the grooves are 0.5mm, the bottom surface allowance of the three chambers in the main view cavity, the top view cavity, and the right view cavity is 0.5mm, and the flatness of the end face of the cavity in the top view is 0.01mm.

[0017] The raw and cold treatment comprises three cycles of high temperature followed by low temperature.

[0018] The anodizing treatment is carried out in a solution with a sulfuric acid concentration of 200 g / L, a current density of 2.5 A / dm2 and a voltage of 40-80 V for a treatment time of 1 hour. The initial current density is 0.5 A / dm2 and the voltage is 12 V. Within 20 minutes, the current density is increased to 2.5 A / dm2 until the oxidation is completed.

[0019] The present invention provides a precision processing method for a laser gyroscope cavity, wherein the cavity has a main view end face, a main view cavity, a boss in the main view cavity, a weight reduction groove on the main view end face, a top view end face, a top view main cavity, a boss in the top view main cavity, a top view sub-cavity, a right view end face, a right view cavity, a boss in the right view cavity, a groove on the right view end face, a positioning hole on the right view end face groove, a left view end face, a left view end face weight reduction groove, a groove on the left view end face, a positioning hole on the left view end face groove, a bottom view end face, a weight reduction groove on the top view end face, a bottom view main cavity, a bottom view sub-cavity, a notch on the top view end face, The boss in the main cavity of the top view, the printed circuit board groove in the main cavity of the top view, the end face of the rear view and the weight-reducing groove on the end face of the rear view are characterized in that they include the following steps: after pre-processing the cavity blank, the dimension of the cavity is marked to obtain the dimension line; based on the dimension line, the various surfaces, holes and weight-reducing grooves of the cavity blank are roughly milled; the burrs generated by the processing of the various surfaces, holes and weight-reducing grooves are removed, and the edges are blunted and then heat treated; with the end face of the main view as the positioning surface, the grooves on the upper end faces of the left view and the right view and the positioning holes thereon are semi-finished; the burrs generated after semi-finishing are removed, and the The edges of the cavity are blunted, the cavity is cryogenically treated, and the bottom view end face is ground; the bottom view end face is positioned to perform milling on the main view cavity, the top view cavity and the right view cavity; the burrs generated after milling are removed, the edges are blunted, all threads are tapped, and the main view cavity, the top view cavity and the right view cavity are cleaned all around; the processed cavity surface is anodized to obtain the laser gyroscope cavity. The cavity is first rough-milled in a parallax processing manner to leave a uniform allowance for subsequent fine processing, and then released through multiple heat treatment processes during the processing. The residual stress in the machining process further improves the strength and hardness of the cavity, providing a basis for the accuracy of subsequent machining. Secondly, the ground end face is used as the positioning reference for fine machining to ensure the machining accuracy of the remaining views. Finally, the cavity is anodized to add a layer of oxide film to the cavity, further improving the service life of the cavity, thereby achieving precise machining of the cavity. This method can effectively ensure the machining accuracy of each end face, each groove, and each positioning hole, and ensure the installation accuracy of the cavity and the external box body, as well as internal parts, electronic components, etc., thereby solving the problem of large machining errors in traditional machining methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a flow chart of a precision machining method for a laser gyroscope cavity provided by the present invention.

[0022] Figure 2 It is a schematic diagram of the cavity structure.

[0023] Figure 3 It is a schematic diagram of the structure of the cavity in the other direction.

[0024] 1- Main view end face, 11- Main view chamber, 12- Boss in main view chamber, 13- Weight reduction groove on main view end face, 2- Top view end face, 21- Top view main chamber, 22- Boss in main chamber, 23- Top view sub-chamber, 3- Right view end face, 31- Right view chamber, 32- Boss in right view chamber, 33- Groove on right view end face, 34- Positioning hole on groove on right view end face, 4- Left view End face, 41-weight-reducing groove on the end face in the left view, 42-groove on the end face in the left view, 43-positioning hole on the groove on the end face in the left view, 5-end face in the bottom view, 51-weight-reducing groove on the end face in the bottom view, 52-main chamber in the bottom view, 53-sub-chamber in the bottom view, 54-notch on the end face in the top view, 55-boss in the main chamber in the bottom view, 56-printed circuit board groove in the main chamber in the top view, 6-end face in the rear view, 61-weight-reducing groove on the end face in the rear view. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0026] See also Figures 1 to 3The present invention provides a precision machining method for a laser gyroscope cavity, which is applied to a laser gyroscope cavity. The laser gyroscope cavity comprises a front view end face 1, a front view cavity 11, a boss 12 in the front view cavity, a weight reduction groove 13 on the front view end face, a top view end face 2, a top view main cavity 21, a boss 22 in the top view main cavity, a top view sub-cavity 23, a right view end face 3, a right view cavity 31, a boss 32 in the right view cavity, a groove 33 on the right view end face, The positioning hole 34 on the end face groove in the right view, the end face 4 in the left view, the weight-reducing groove 41 in the end face in the left view, the groove 42 on the end face in the left view, the positioning hole 43 on the end face groove in the left view, the end face 5 in the bottom view, the weight-reducing groove 51 on the end face in the bottom view, the main cavity 52 in the bottom view, the auxiliary cavity 53 in the bottom view, the notch 54 on the end face in the top view, the boss 55 in the main cavity in the bottom view, the printed circuit board groove 56 in the main cavity in the bottom view, the end face 6 in the rear view, and the weight-reducing groove 61 on the end face in the rear view include the following steps:

[0027] S1 pre-processes the cavity blank and then marks the cavity to obtain dimension lines;

[0028] Specifically, a cavity blank is obtained through a casting process, the pouring spout is removed, the saw cuts are smoothed, and then the burrs are removed, and all the outer shapes of the cavity and the dimensions of the internal cavity are marked.

[0029] S2: rough milling each surface, each hole and each weight-reducing groove of the cavity blank based on the dimension line;

[0030] The rough milling requirement is to retain the shape of the cavity, each surface and the weight-reducing groove with a 1mm margin, and at the same time, all holes and waist-shaped holes except the threaded bottom hole have a single-side margin of 2mm.

[0031] Specifically, according to the drawn reference lines, the cavity shape, each surface, each hole and the weight-reducing groove are roughly milled. During the rough milling process, the cavity shape, each surface and the weight-reducing groove margin should be retained by 1mm. At the same time, all holes and waist-shaped holes except the threaded bottom hole should be left with a single-side margin of 2mm. During the processing, necessary anti-deformation measures should be taken to ensure the dimensions. The surfaces are the main view end face 1, the top view end face 2, the right view end face 3, the left view end face 4, the top view end face 5 and the rear view end face 6. The holes are the positioning holes 34 on the groove of the right view end face and the positioning holes 43 on the groove of the left view end face. Therefore, the weight-reducing grooves are the weight-reducing grooves 13 on the main view end face, the weight-reducing grooves 41 on the left view end face, the weight-reducing grooves 51 on the top view end face and the weight-reducing grooves 61 on the rear view end face.

[0032] S3: removing burrs generated by machining the surfaces, holes, and weight-reducing grooves, blunting the edges, and then performing heat treatment;

[0033] The heat treatment temperature is 160±5° C. and the holding time is 4 hours.

[0034] Specifically, the burrs generated by processing are removed, the edges are blunted, and then the residual stress during the second rough milling is eliminated by high temperature method, that is, the cavity is placed in an oven at a temperature of 160±5℃ for 4 hours, and then air-cooled.

[0035] S4 uses the end face 1 of the main view as the positioning surface, and performs semi-finishing processing on the end face grooves and the positioning holes on the left view and the right view;

[0036] The semi-finishing should ensure that the depth allowance of the 8 grooves on the left view and the right view of the cavity and the radius allowance of the 8 positioning holes on the grooves are 0.5mm, the bottom surface allowance of the three chambers in the main view cavity, the top view cavity, and the right view cavity is 0.5mm, and the flatness of the end face 5 of the cavity in the top view is 0.01mm. The grooves are the grooves 33 on the end face of the right view and the grooves 42 on the end face of the left view, and the holes are the positioning holes 43 on the groove on the end face of the left view and the positioning holes 34 on the groove on the end face of the right view.

[0037] Specifically, with the end face positioned and the pressure plate clamped, the grooves 42, 33 and the positioning holes 43, 34 at the grooves of the left and right views are milled respectively, ensuring that the groove depth allowance and the radius allowance of the positioning holes on the grooves are 0.5mm. Secondly, the chambers of the main, top and right views are milled, including the main view chamber 11, the top view main chamber 21, the top view sub-chamber 23, and the right view chamber 31, ensuring that the bottom surface allowance of each chamber is 0.5mm. Then, the top view main chamber 52, the top view sub-chamber 53, each hole, each boss and chamfer are milled to the dimensions shown in the figure, and the flatness of the top view end face 2 is ensured to be 0.01mm. Finally, the printed circuit board slot 56 in the main cavity of the top view is milled to the size shown in the figure and all threaded bottom holes are drilled. During milling, the length of the printed circuit board slot 56 in the main cavity of the top view should be 81.5 mm and the distance from the bottom surface of the printed circuit board slot 56 in the main cavity of the top view to the end surface 5 of the cavity in the top view should be 26 mm to ensure the accuracy of installation.

[0038] S5 removes burrs generated after semi-finishing, blunts the edges of the cavity, performs cryogenic treatment on the cavity, and grinds the bottom view end face 5;

[0039] The raw and cold treatment comprises three cycles of high temperature followed by low temperature.

[0040] Specifically, the burrs generated by processing are removed, the edges of the cavity are blunted, and then the cavity is cryogenically treated. Finally, the top view end face 5 is ground to ensure its flatness of 0.005mm, while taking into account the distance of 182.5mm from the top view end face 5 of the cavity to the top view end face 2, the depth dimension of 2mm of each weight reduction groove, and the depth dimension of 8mm of the notch 54 on the top view end face 5.

[0041] S6: Positioning the bottom view end surface 5, performing milling on the main view cavity 11, the top view cavity, and the right view cavity 31;

[0042] Specifically, locate the grinding surface and mill the main, top and right views Figure 3 The main chamber is drilled to a 2mm diameter, with a chamfer of C0.3 at the hole mouth and a diameter of Ø8H5 in the main, top, and right views. The grooves and positioning holes in the left and right views are milled to a 169.1-169.2mm distance from the bottom of groove 42 in the left view to the bottom of groove 33 in the right view. The diameter of the threaded bottom holes in each groove is milled to 3mm. The positioning holes 43 and 34 in the grooves in the left and right views are milled to a diameter of 22mm. The remaining external shapes are milled to a 22mm diameter. After step S6, the completed cavity should be inspected to ensure all dimensions are met.

[0043] S7: removing burrs generated after milling, blunting edges, tapping all threads, and performing root cleaning around the front view chamber 11, the top view chamber, and the right view chamber 31;

[0044] Specifically, remove the burrs produced by processing, blunt the edges, tap all threads, and Figure 3 The cavity and the 9 bosses inside it are cleaned all around.

[0045] S8 performs anodizing treatment on the surface of the processed cavity to obtain a laser gyroscope cavity.

[0046] The anodizing treatment is carried out in a solution with a sulfuric acid concentration of 200 g / L, a current density of 2.5 A / dm2 and a voltage between 40-80 V for a treatment time of 1 hour, with an initial current density of 0.5 A / dm2 and a voltage of 12 V, which is increased to 2.5 A / dm2 within 20 minutes until the oxidation is completed.

[0047] Specifically, the processed cavity surface is anodized. The cavity anodizing process involves placing it in a sulfuric acid solution with a concentration of 200g / L, at a current density of 2.5A / dm² and a voltage between 40-80V for one hour. The initial current density is 0.5A / dm² and the voltage is 12V. Within 20 minutes, the current density is gradually increased to 2.5A / dm² until the anodizing process is complete. This operation adds a thin oxide film to the cavity, further extending its service life.

[0048] The above disclosure is only a preferred embodiment of the precision processing method of a laser gyroscope cavity of the present invention. Of course, it cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment are implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A precision machining method for a laser gyroscope cavity, applied to a laser gyroscope cavity, wherein the laser gyroscope cavity comprises a front view end face, a front view cavity, a boss in the front view cavity, a weight reduction groove on the front view end face, a top view end face, a top view main cavity, a boss in the top view main cavity, a top view sub-cavity, a right view end face, a right view cavity, a boss in the right view cavity, a groove on the right view end face, a positioning hole on the groove on the right view end face, a left view end face, a weight reduction groove on the left view end face, a groove on the left view end face, a positioning hole on the groove on the left view end face, a bottom view end face, a weight reduction groove on the top view end face, a bottom view main cavity, a bottom view sub-cavity, a notch on the top view end face, a boss in the top view main cavity, a printed circuit board groove in the top view main cavity, a rear view end face, and a weight reduction groove on the rear view end face, characterized in that: The following steps are involved: After pre-processing the blank of the cavity, dimension lines are marked to obtain dimension lines; Rough milling of each surface, each hole and each weight-reducing groove of the blank of the cavity based on the dimension line; removing burrs generated by machining the surfaces, the holes, and the weight-reducing grooves, and blunting the edges, followed by heat treatment; Using the end face of the main view as the positioning surface, semi-finishing the grooves and positioning holes on the upper end faces of the left view and the right view; removing burrs generated after semi-finishing, blunting the edges of the cavity, subjecting the cavity to cryogenic treatment, and grinding the bottom view end face; Positioning the bottom view end face, performing milling on the main view chamber, the top view chamber, and the right view chamber; removing burrs generated after milling, blunting edges, tapping all threads, and performing root cleaning around the front view cavity, the top view cavity, and the right view cavity; The surface of the processed cavity is anodized to obtain a laser gyroscope cavity.

2. The method for precision machining of a laser gyroscope cavity according to claim 1, wherein: The rough milling requirement is to retain the shape of the cavity, each surface and the weight-reducing groove with a 1mm margin, and at the same time, all holes and waist-shaped holes except the threaded bottom hole have a single-side margin of 2mm.

3. The method for precision machining of a laser gyroscope cavity according to claim 2, wherein: The heat treatment temperature is 160±5° C. and the holding time is 4 hours.

4. The method for precision machining of a laser gyroscope cavity according to claim 3, wherein: The semi-finishing should ensure that the depth allowance of the 8 grooves on the left view and the right view of the cavity and the radius allowance of the 8 positioning holes on the grooves are 0.5mm, the bottom surface allowance of the main view cavity, the top view main cavity, and the right view cavity is 0.5mm, and the flatness of the end face of the cavity in the top view is 0.01mm.

5. The method for precision machining of a laser gyroscope cavity according to claim 4, wherein: The cryogenic treatment includes three cycles of high temperature followed by low temperature.

6. The method for precision machining of a laser gyroscope cavity according to claim 5, wherein: The anodizing treatment is carried out in a solution with a sulfuric acid concentration of 200 g / L, a current density of 2.5 A / dm2 and a voltage between 40-80 V for a treatment time of 1 hour, with an initial current density of 0.5 A / dm2 and a voltage of 12 V, which is increased to 2.5 A / dm2 within 20 minutes until the oxidation is completed.

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