Continuous oxyhydrogen hot-pressing system for micro-hemisphere forming

Abstract

The utility model discloses a continuous oxyhydrogen hot pressing system for micro hemisphere forming, which comprises a mounting structure, an oxyhydrogen flame mechanism, a rotary table, a lower die and an upper die, the rotary table is horizontally and rotatably connected to the mounting structure, the lower die is fixed on the rotary table, the lower die is provided with a forming cavity, and the cavity wall of the forming cavity is matched with the outer wall surface of a micro hemisphere; the upper mold and the oxyhydrogen flame mechanism are both arranged on the mounting structure and located above the lower mold, the upper mold is provided with a forming part, the surface of the forming part is matched with the inner wall face of the micro hemisphere, the oxyhydrogen flame mechanism is used for heating a quartz plate on the lower mold to the softening temperature, and the softened quartz plate falls off and is attached to the cavity wall of the forming cavity; the rotary table can horizontally rotate until the lower mold corresponds to the oxyhydrogen flame mechanism or corresponds to the upper mold, and the upper mold can move downwards to the forming part to be matched with the forming cavity, so that a quartz plate which is softened and attached to the cavity wall of the forming cavity is formed into a micro hemisphere. According to the utility model, the surface thickness uniformity, the process repeatability and the process efficiency of the micro-hemispherical harmonic oscillator can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hemispherical resonator gyro preparation, in particular to a continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming. Background Technique

[0002] The hemispherical resonator gyro is a new type of solid-state navigation gyroscope for measuring the precession angle, and its core component is a hemispherical resonator made of precision machining of fused quartz. The quality factor of the micro-hemisphere is a common parameter to measure its processing accuracy and performance. The hemispherical resonator with high symmetry has stable physical properties, that is, it has a high quality factor (Q value). Therefore, a stable, accurate and excellent reproducible micro-hemisphere processing technology is of great significance to the overall performance of the micro-hemispherical resonator gyro. However, limited by the current technical processing conditions, there are different degrees of mass uniformity errors in the hemispherical resonator, resulting in a decrease in the quality factor of the hemispherical resonator, thereby affecting the real-time and long-term measurement accuracy of the hemispherical resonator gyro. Currently, the most commonly used micro-hemisphere processing technology is basically the hydrogen-oxygen flame hot forming technology using a single lower mask. The quartz wafer is softened by the hydrogen-oxygen flame and then formed downward by the negative pressure in the mold through the profiling method. There are two problems with this process method:

[0003] 1) During the softening process of the quartz wafer, the forming is only controlled by its own gravity and negative pressure suction. By adjusting and optimizing the parameters, a high-quality hemisphere bottom surface (i.e., the outer surface of the formed hemispherical resonator) can be constructed. However, due to the design of a single mold, there is a lack of means for controlling the topography of the upper surface of the quartz wafer (i.e., the inner surface of the formed hemispherical resonator), and defects such as uneven thickness on the quartz wafer surface will be retained after forming, resulting in uneven overall thickness of the hemisphere;

[0004] 2) Although the hydrogen-oxygen flame hot forming technology has flexible design and can realize the immediate adjustment of design parameters, the overall efficiency is relatively low, especially compared with the chemical bubble method that can be mass-produced. Content of the Utility Model

[0005] Aiming at the problems in the background technique, the utility model proposes a continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming, which can improve the surface thickness uniformity, process repeatability and process efficiency of the micro-hemispherical resonator.

[0006] The utility model adopts the following technical solutions:

[0007] A continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming, comprising: a mounting structure, a hydrogen-oxygen flame mechanism, a turntable, a lower mold and an upper mold. The turntable is horizontally rotatably connected to the mounting structure, the lower mold is fixed on the turntable, the lower mold has a forming surface, and a forming cavity is opened on the forming surface. The cavity wall of the forming cavity matches the outer wall surface of the micro-hemisphere.

[0008] The upper mold and the oxyhydrogen flame mechanism are both arranged on the mounting structure and are both located above the lower mold. The upper mold has a molding part, the surface of which matches the inner wall surface of the micro-hemisphere. The oxyhydrogen flame mechanism is used to heat the quartz sheet on the molding surface of the lower mold to a softening temperature, and the softened quartz sheet falls and fits on the wall of the molding cavity.

[0009] The turntable can rotate horizontally until the lower mold corresponds to the oxyhydrogen flame mechanism or the upper mold, and the upper mold can move up and down relative to the mounting structure, so that the molding part moves down to cooperate with the molding cavity, so that the quartz sheet softened and attached to the wall of the molding cavity can be molded into a micro-hemisphere.

[0010] Preferably, there are multiple lower molds, which are circumferentially distributed on a turntable, and the turntable can be horizontally rotated until one of the lower molds corresponds to the oxyhydrogen flame mechanism, and the other lower mold that completes the heating of the quartz plate corresponds to the upper mold.

[0011] Preferably, the upper mold includes a mold body, the center of the mold body extends downward to form a hemispherical structure, the center of the hemispherical structure is recessed inward to form an anchor column cavity that cooperates with the micro-hemispherical anchor column, and the hemispherical structure with the anchor column cavity forms the molding part.

[0012] Preferably, the center of the upper surface of the lower mold extends upward to form a boss, the upper surface of the boss forms the molding surface, the center of the molding surface is recessed downward to form a cavity that cooperates with the outer wall of the hemisphere, the center of the cavity extends upward to form a molding column that cooperates with the anchor column cavity, and the cavity with the molding column forms the molding cavity.

[0013] Preferably, the mounting structure includes a base frame, a first mounting platform fixed on the base frame, and a second mounting platform, the second mounting platform is located above the first mounting platform, the turntable is horizontally rotatably mounted on the first mounting platform, and the upper mold and the oxyhydrogen flame mechanism are mounted on the second mounting platform through a mounting frame.

[0014] Preferably, the oxyhydrogen flame mechanism comprises a nozzle, a servo motor and a clamp, the nozzle is mounted on the mounting frame through the clamp, the servo motor is fixed on the mounting frame and is drivingly connected to the valve on the nozzle to control the opening and closing size of the valve to control the oxyhydrogen flame flow rate of the nozzle.

[0015] Preferably, the mounting frame is also provided with an infrared temperature measuring head for detecting the temperature of the micro-hemispherical molding.

[0016] Preferably, a linear drive mechanism is provided on the mounting frame, and the linear drive mechanism is transmission-connected to the upper mold and is used for driving the upper mold to slide up and down relative to the mounting frame.

[0017] Preferably, the turntable is horizontally rotatably mounted on the first mounting platform via a slewing bearing, and a slewing drive mechanism transmission-connected to the slewing bearing is provided on the base frame for driving the slewing bearing to rotate.

[0018] Preferably, a controller is further provided on the second mounting table, and the controller is electrically connected to the servo motor, the linear drive mechanism, the rotary drive mechanism, and the infrared temperature measuring head.

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] The continuous hydrogen-oxygen hot pressing system for micro hemisphere forming of the present utility model enables the lower mold to rotate through the designed turntable so that the quartz sheet thereon is heated by the hydrogen-oxygen flame mechanism to soften and drop onto the cavity wall of the forming cavity, initially forming a micro hemisphere, and then rotating to correspond to the upper mold. The upper mold moves down to cooperate with the forming cavity of the lower mold at the forming part to perform secondary contour shaping on the softened quartz sheet between the forming part and the cavity wall of the forming cavity, thereby maximizing the removal of the structural non-uniformity of the micro hemisphere, greatly improving the surface thickness uniformity of the micro hemisphere resonator and the process repeatability, improving the process efficiency, greatly reducing the material cost and labor cost, and having very high practical significance for the Q value test of the micro hemisphere or subsequent other process treatments. Description of the Drawings

[0021] In order to more easily understand the present utility model, the present utility model will be described in more detail by referring to the specific embodiments shown in the drawings. These drawings only depict the typical embodiments of the present utility model and should not be considered as limiting the protection scope of the present utility model.

[0022] Figure 1 It is a schematic structural diagram of the continuous hydrogen-oxygen hot pressing system for micro hemisphere forming according to an embodiment of the present utility model.

[0023] Figure 2 It is a schematic structural diagram of the upper mold and the lower mold in the closed state according to an embodiment of the present utility model.

[0024] Figure 3 It is a three-dimensional structural diagram of the upper mold according to an embodiment of the present utility model.

[0025] Figure 4 It is a schematic structural diagram of the upper mold mounted on the mounting frame according to an embodiment of the present utility model.

[0026] Figure 5 It is a schematic structural diagram of the hydrogen-oxygen flame mechanism according to an embodiment of the present utility model.

[0027] Reference Signs:

[0028] 1. Hydrogen-oxygen flame mechanism; 11. Nozzle; 12. Servo motor; 13. Fixture; 14. Coupling; 2. Infrared temperature measuring head; 3. Lower mold; 31. Forming surface; 32. Forming cavity; 33. Boss; 34. Forming column; 4. Turntable; 5. Slewing bearing; 6. Upper mold; 61. Forming part; 62. Anchor column cavity; 63. Mold body; 64. Mounting plate; 7. Controller; 8. Mounting structure; 81. Underframe; 82. First mounting table; 83. Second mounting table; 84. Mounting frame; 85. Linear drive mechanism; 86. Slide rail; 9. Slewing drive mechanism. Detailed implementation manners

[0029] The following describes the implementation manners of the present utility model with reference to the accompanying drawings, so that those skilled in the art can better understand the present utility model and be able to implement it. However, the listed embodiments are not intended to limit the present utility model. Without conflict, the following embodiments and the technical features in the embodiments can be combined with each other, and the same components are denoted by the same reference numerals.

[0030] As Figure 1 shown, the continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming in this embodiment includes: a mounting structure 8, a hydrogen-oxygen flame mechanism 1, a turntable 4, a lower mold 3 and an upper mold 6. The turntable 4 is horizontally rotatably connected to the mounting structure 8, the lower mold 3 is fixed to the turntable 4, the lower mold 3 has a forming surface 31, and a forming cavity 32 is formed on the forming surface 31. The cavity wall of the forming cavity 32 matches the outer wall surface of the micro-hemisphere.

[0031] The upper mold 6 and the hydrogen-oxygen flame mechanism 1 are both arranged on the mounting structure 8 and are both located above the lower mold 3. The upper mold 6 has a forming part 61, and the surface of the forming part 61 matches the inner wall surface of the micro-hemisphere. The hydrogen-oxygen flame mechanism 1 is used to heat the quartz sheet on the forming surface 31 of the lower mold 3 to the softening temperature, and the softened quartz sheet drops and adheres to the cavity wall of the forming cavity 32.

[0032] The turntable 4 can be horizontally rotated to correspond to the lower mold 3 and the hydrogen-oxygen flame mechanism 1 or to the upper mold 6. The upper mold 6 can move up and down relative to the mounting structure 8, so that the forming part 61 moves down to cooperate with the forming cavity 32, so as to form a micro-hemisphere from the quartz sheet softened and adhered to the cavity wall of the forming cavity 32.

[0033] Thus, in the present utility model, by designing the turntable 4, the lower mold 3 can be rotated so that the quartz wafer thereon is heated by the oxy-hydrogen flame mechanism 1 until it softens and drops onto the wall of the forming cavity 32, initially forming a micro hemisphere. Then, it is rotated to correspond to the upper mold 6, and the upper mold 6 moves downward so that its forming part 61 cooperates with the forming cavity 32 of the lower mold 3 to perform secondary contour shaping on the softened quartz wafer between the forming part 61 and the wall of the forming cavity 32. Thereby, the structural non-uniformity of the micro hemisphere can be removed to the greatest extent, the surface thickness uniformity of the micro hemisphere resonator and the process repeatability are greatly improved, the process efficiency is increased, the material cost and labor cost are greatly reduced, which has very high practical significance for the Q value test of the micro hemisphere or subsequent other process treatments.

[0034] To further improve the process efficiency, multiple lower molds 3 are provided. The multiple lower molds 3 are circumferentially and evenly distributed on the turntable 4. The turntable 4 can be horizontally rotated so that one of the lower molds 3 corresponds to the oxy-hydrogen flame mechanism 1, and another lower mold 3 that has completed the heating of the quartz wafer corresponds to the upper mold 6. In this embodiment, there are four lower molds 3, and the four lower molds 3 are symmetrically installed on the turntable 4 at 90-degree intervals. After the lower mold 3 and the upper mold 6 are aligned through the transmission mechanism, the initially formed softened quartz wafer is pressed into a micro hemisphere shell structure in the cavity between the two by the extrusion molding process. The matching parameters between the molds determine the morphological characteristics (such as thickness, fillet radius, etc.) of the micro hemisphere.

[0035] The turntable 4 is used to carry the four sets of lower molds 3 required for forming and is fastened by positioning screws. The forming cavity 32 of the lower mold 3 and the installation of the nozzle 11 should maintain coaxiality to ensure symmetry during the hot forming process.

[0036] The high-precision rotary drive mechanism controls the rotary bearing 5 to drive the turntable 4 to rotate, and can accurately position the four sets of lower molds directly below the nozzle 11. The repeat positioning accuracy can reach ±1um.

[0037] As Figure 2 and Figure 3 shown, in this embodiment, the upper mold 6 includes a mold body 63. The center of the mold body 63 extends downward to form a hemispherical structure. The center of the hemispherical structure is recessed inward to form an anchor post cavity 62 that cooperates with the micro hemisphere anchor post. The hemispherical structure with the anchor post cavity 62 forms the forming part 61.

[0038] As Figure 2 shown, a boss 33 extends upward from the center of the upper surface of the lower mold 3. The upper surface of the boss 33 forms a forming surface 31. The center of the forming surface 31 is recessed downward to form a cavity that cooperates with the outer wall surface of the hemisphere. A forming post 34 that cooperates with the anchor post cavity 62 extends upward from the center of the cavity. The cavity with the forming post 34 forms the forming cavity 32.

[0039] By designing the contour structure inside the upper and lower molds, a molding space matching the micro-hemispherical shape is provided between the molding portion 61 and the molding cavity 32. By the pressure when the upper and lower molds are closed, the softened quartz sheet is reshaped according to the molding space to form a micro-hemispherical shape, thereby ensuring the uniform thickness distribution of the spherical shell to the greatest extent. At the same time, defects generated during the initial hot forming process, such as uneven thickness, asymmetric mass distribution, and local tiny depressions, can also be removed, and process consistency and design flexibility are improved: the morphology structure of the micro-hemispherical shape produced by this process is determined by the cooperation of the upper and lower molds, is not affected by other factors, and has high stability; at the same time, its morphology structure can also be flexibly adjusted by replacing the upper and lower molds with different parameters, thereby increasing the scope of application of the equipment.

[0040] In this embodiment, the mounting structure 8 includes a base frame 81, a first mounting platform 82 fixed on the base frame 81, and a second mounting platform 83, the second mounting platform 83 is located above the first mounting platform 82, the turntable 4 is horizontally rotatably mounted on the first mounting platform 82, and the upper mold 6 and the oxyhydrogen flame mechanism 1 are mounted on the second mounting platform 83 through a mounting frame 84.

[0041] In this embodiment, Figure 5 As shown, the oxyhydrogen flame mechanism 1 includes a nozzle 11, a servo motor 12 and a clamp 13. The nozzle 11 is mounted on a mounting frame 84 through the clamp 13. The servo motor 12 is fixed on the mounting frame 84 and is connected to the valve on the nozzle 11 through a coupling 14 for controlling the opening and closing size of the valve to control the oxyhydrogen flame flow rate of the nozzle 11.

[0042] In this embodiment, an infrared temperature measuring head 2 is also provided on the mounting frame 84 to detect the temperature of the micro-hemispherical molding. The infrared temperature measuring head 2 can monitor the process temperature in real time during the molding process, and the parameters will be displayed in real time on the display panel of the controller 7 to ensure the accuracy of the process parameters.

[0043] In this embodiment, Figure 4 As shown, a linear drive mechanism 85 and a slide rail 86 are provided on the mounting frame 84, and the mold body 63 of the upper mold 6 is connected to the linear drive mechanism 85 through the mounting plate 64, and the linear drive mechanism 85 is used to drive the upper mold 6 to slide up and down relative to the mounting frame 84. The linear drive mechanism 85 includes a drive motor, a lead screw nut substructure connected to the drive motor, and the nut of the lead screw nut substructure is slidably arranged on the slide rail 86.

[0044] In this embodiment, the turntable 4 is horizontally rotatably mounted on the first mounting platform 82 via the slewing bearing 5 , and a slewing driving mechanism 9 is provided on the base frame 81 , which is transmission-connected to the slewing bearing 5 and is used to drive the slewing bearing 5 to rotate.

[0045] In this embodiment, a controller 7 is further provided on the second mounting table 83, and the controller 7 is electrically connected to the servo motor 12, the linear driving mechanism 85, the rotary driving mechanism 9, and the infrared temperature measuring head 2.

[0046] The process of forming a micro hemisphere by the continuous hydrogen-oxygen hot pressing system in this embodiment is as follows:

[0047] The turntable 4 rotates to make one of the lower molds 3 correspond to the nozzle 11. After adjusting the height of the nozzle 11 to a vertical height of 1.5 - 2.5 cm from the quartz wafer on the lower mold 3, the hydrogen-oxygen flame is turned on to heat the quartz wafer above the softening point, and it is preliminarily formed in the forming cavity 32 of the lower mold through the negative pressure system; through the high-precision transmission mechanism, the turntable 4 can be rotated clockwise so that the lower mold 3 with the micro hemisphere preliminarily formed is located directly below the upper mold 6. The rotation process is controlled by a high-precision servo motor, which can ensure the accurate alignment of the centers of the upper and lower molds; after rotating to the predetermined position, the linear driving mechanism 85 controls the upper mold 6 to descend uniformly. At this time, the central axes of the upper mold 6 and the lower mold 3 are completely aligned and approach each other until they are completely and tightly fitted; during this process, the softened and molten quartz wafer that has been preliminarily formed in the lower mold will be secondarily shaped according to the contour of the cavity between the two molds due to the pressure applied by the upper and lower molds simultaneously. The specific morphology and shell thickness are related to the mold parameters. After the forming is completed, the controller 7 controls the linear driving mechanism 85 to drive the upper mold 6 to rise and reset, and the turntable 4 continues to rotate clockwise by 90 degrees to transfer the lower mold 3 to the demolding station, and the process ends. The advantages of this process are as follows:

[0048] 1) By adjusting the inner contour parameters of the upper and lower molds to design the cavity morphology and using the extrusion forming process method, the uniform distribution of the thickness of the spherical shell can be ensured to the greatest extent, and at the same time, the defects generated in the preliminary hot forming process can also be removed, such as problems of uneven thickness, asymmetric mass distribution, and local micro depressions.

[0049] 2) Improve process consistency and design flexibility: The morphology structure of the micro hemisphere produced by this process is determined by the mutual cooperation of the upper and lower molds and is not affected by other factors, with high stability; at the same time, its morphology structure can also be flexibly adjusted by replacing the upper and lower molds with different parameters, increasing the applicable range of the equipment.

[0050] The above-described embodiments are only relatively preferred specific implementation manners of the present invention. The present specification uses phrases such as "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can all refer to one or more of the same or different embodiments according to the present disclosure. The ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should all be included within the protection scope of the present invention.

Claims

1. A continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming, characterized in that, include: The invention comprises a mounting structure (8), an oxyhydrogen flame mechanism (1), a turntable (4), a lower mold (3) and an upper mold (6), wherein the turntable (4) is horizontally rotatably connected to the mounting structure (8), the lower mold (3) is fixed on the turntable (4), the lower mold (3) has a molding surface (31), and a molding cavity (32) is formed on the molding surface (31), and the cavity wall of the molding cavity (32) matches the outer wall surface of the micro-hemisphericity. The upper mold (6) and the oxyhydrogen flame mechanism (1) are both arranged on the mounting structure (8) and are both located above the lower mold (3). The upper mold (6) has a molding portion (61), the surface of the molding portion (61) matches the inner wall surface of the micro-hemisphere, and the oxyhydrogen flame mechanism (1) is used to heat the quartz sheet on the molding surface (31) of the lower mold (3) to a softening temperature, so that the softened quartz sheet falls and adheres to the cavity wall of the molding cavity (32). The turntable (4) can be rotated horizontally until the lower mold (3) corresponds to the oxyhydrogen flame mechanism (1) or corresponds to the upper mold (6), and the upper mold (6) can move up and down relative to the mounting structure (8) so that the molding portion (61) moves down to cooperate with the molding cavity (32), so that the quartz sheet softened and attached to the cavity wall of the molding cavity (32) can be molded into a micro-hemisphere.

2. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 1, wherein A plurality of lower molds (3) are provided, and the plurality of lower molds (3) are circumferentially distributed on a turntable (4). The turntable (4) can be horizontally rotated until one of the lower molds (3) corresponds to the oxyhydrogen flame mechanism (1), and another lower mold (3) that completes heating of the quartz plate corresponds to the upper mold (6).

3. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 1, characterized in that, The upper mold (6) comprises a mold body (63), the center of the mold body (63) extends downward to form a hemispherical structure, the center of the hemispherical structure is recessed inward to form an anchor column cavity (62) that cooperates with the micro-hemispherical anchor column, and the hemispherical structure with the anchor column cavity (62) forms the molding portion (61).

4. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 3, wherein The center of the upper surface of the lower mold (3) extends upward to form a boss (33), the upper surface of the boss (33) forms the molding surface (31), the center of the molding surface (31) is recessed downward to form a cavity that matches the outer wall of the hemisphere, the center of the cavity extends upward to form a molding column (34) that matches the anchor column cavity (62), and the cavity with the molding column (34) forms the molding cavity (32).

5. The continuous hydrogen-oxygen hot pressing system for microhemisphere forming according to any one of claims 1-4, characterized in that The mounting structure (8) comprises a base frame (81), a first mounting platform (82) fixed on the base frame (81), and a second mounting platform (83), wherein the second mounting platform (83) is located above the first mounting platform (82), the turntable (4) is horizontally rotatably mounted on the first mounting platform (82), and the upper mold (6) and the oxyhydrogen flame mechanism (1) are mounted on the second mounting platform (83) via a mounting frame (84).

6. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 5, characterized in that, The oxyhydrogen flame mechanism (1) comprises a nozzle (11), a servo motor (12) and a clamp (13); the nozzle (11) is mounted on the mounting frame (84) via the clamp (13); the servo motor (12) is fixed on the mounting frame (84) and is drivingly connected to a valve on the nozzle (11) for controlling the opening and closing size of the valve to control the flow size of the oxyhydrogen flame of the nozzle (11).

7. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 6, characterized in that The mounting frame (84) is also provided with an infrared temperature measuring head (2) for detecting the temperature of the micro-hemispherical molding.

8. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 7, wherein The mounting frame (84) is provided with a linear drive mechanism (85), which is transmission-connected to the upper mold (6) and is used to drive the upper mold (6) to slide up and down relative to the mounting frame (84).

9. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 8, characterized in that, The turntable (4) is mounted on the first mounting platform (82) for horizontal rotation via a slewing bearing (5), and a slewing driving mechanism (9) is provided on the base frame (81) and is connected to the slewing bearing (5) for driving the slewing bearing (5) to rotate.

10. The continuous hydrogen-oxygen hot pressing system for micro-hemisphere forming according to claim 9, wherein, A controller (7) is also provided on the second mounting platform (83), and the controller (7) is electrically connected to the servo motor (12), the linear drive mechanism (85), the rotary drive mechanism (9) and the infrared temperature measuring head (2).

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