Lightweight mirror grinding thermal expansion suppression device

Abstract

This invention relates to a device for suppressing thermal expansion during grinding of lightweight reflectors. It includes a mounting base with a hot air evacuation channel on its top corresponding to a weight-reducing hole on the lightweight reflector. This hot air evacuation channel is connected to the outside environment. The accumulated heat from grinding causes the air inside the weight-reducing hole to expand, and the expanded air is discharged through the hot air evacuation channel, ensuring that the weight-reducing hole and the machine tool table are always in a non-closed state. A clamping mechanism is also included, with multiple sets of elastic clamping mechanisms arranged around the reflector on the mounting base. These clamping mechanisms are used to elastically clamp and stably fix the reflector to the top of the mounting base. This invention achieves high-rigidity clamping of lightweight reflectors, reduces clamping stress, avoids the impact of elastic air films caused by accumulated grinding heat on the component's machining accuracy and determinism, and improves the component's machining accuracy and overall machining efficiency. It plays a crucial role in realizing ultra-precision optical manufacturing of large-diameter reflector components.

Description

Technical Field

[0001] This invention relates to the field of aspherical mirror processing technology, and more specifically to a lightweight mirror grinding thermal expansion suppression device. Background Technology

[0002] Large-aperture mirrors are key components in cutting-edge defense and civilian fields such as space exploration, Earth observation, and optoelectronic early warning. They are in high demand and have broad application prospects, making them one of the hot topics in my country's space optical system development. From the perspective of launch and operation costs, the size and weight of space optical systems should be minimized. As a core component of space optical systems, the mass and volume of large-aperture mirrors directly affect the overall size and weight of the system. Effectively reducing the weight of large-aperture mirrors can significantly reduce the launch and operation costs of the system. Therefore, large-aperture mirrors with lightweight structures have become the mainstream launch mirrors for space optical systems and have significant application value.

[0003] Lightweight reflectors have numerous lightweight weight-reducing holes on their backs. These holes form a sealed space with the machine tool table. When the component is ground, the accumulated grinding heat causes the air in the weight-reducing holes to expand, effectively creating a thin air film between the machine tool table and the reflector. This elastic air film directly affects the grinding accuracy and surface convergence certainty of the reflector component, greatly increasing the subsequent polishing time, reducing the processing efficiency of the reflector, and hindering the large-scale engineering application of lightweight reflectors.

[0004] Therefore, in order to address the problem of low machining accuracy and efficiency caused by air expansion during the grinding process of existing lightweight mirrors, it is urgent to study a lightweight mirror thermal expansion suppression device. Summary of the Invention

[0005] Therefore, the purpose of this invention is to propose a lightweight reflector grinding thermal expansion suppression device to solve the problem of low processing accuracy and efficiency caused by air expansion during the grinding of reflectors with lightweight structures.

[0006] This invention provides a lightweight mirror grinding thermal expansion suppression device, comprising:

[0007] The mounting base has a hot air evacuation channel on the top of the mounting base corresponding to the weight reduction hole on the lightweight structure of the reflector. The hot air evacuation channel is connected to the outside. The heat accumulated during the grinding of the reflector causes the air in the weight reduction hole to expand. The expanded air is discharged through the hot air evacuation channel, keeping the weight reduction hole and the machine tool worktable in a non-closed state at all times.

[0008] The mounting base is provided with multiple sets of elastic clamping mechanisms around the reflector, which are used to elastically clamp the reflector and stably fix it to the top of the mounting base.

[0009] Furthermore, the mounting base includes a mounting platform and a ventilated part. The mounting platform is provided with a ventilated part on its top, and the ventilated part is arrayed with multiple sets of vertical channels, and each weight reduction hole corresponds to at least one of the vertical channels.

[0010] Furthermore, the installation platform has multiple horizontal transverse channels along the X direction and a horizontal longitudinal channel connecting the horizontal transverse channels along the Y direction. The vertical channel, the horizontal transverse channels, and the horizontal longitudinal channel constitute the hot air evacuation channel.

[0011] Furthermore, the centers of the horizontal transverse channel and the horizontal longitudinal channel are on the same plane.

[0012] Furthermore, each set of the clamping mechanisms includes:

[0013] A pressure plate, which is fixed to the mounting platform and located outside the reflector;

[0014] A flexible top block is connected to the side of the pressure plate by an adjusting screw, and faces and is used to elastically press against the reflector.

[0015] Furthermore, the pressure plate is L-shaped, with its bottom fixed to the mounting platform and its top side connected to the flexible top block.

[0016] Furthermore, the adjusting screw adopts a fine-thread structure.

[0017] Furthermore, the connecting end of the adjusting screw has a threaded hole, and a locking screw is connected in the threaded hole. The locking screw is connected to the flexible top block. The outer wall of the connecting end of the adjusting screw has no threads, and the other end of the screw has a threaded groove, and the diameter of the other end is larger than the diameter of the connecting end.

[0018] Furthermore, a sealing gasket is bonded to the top of the mounting platform, and the sealing gasket has a through hole in the middle that is the same as that of the reflector; sealant is bonded to the top surface of the sealing gasket and the side surface of the reflector.

[0019] Furthermore, the mounting base is symmetrically provided with handles on two opposite sides along the X direction and located below the horizontal transverse channel. Each handle includes a handle bracket and a connecting rod connected to the handle bracket.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a lightweight structure mirror grinding thermal expansion suppression device. By setting a hot air evacuation channel connected to the outside through the weight reduction hole on the mirror corresponding to the mounting base, the grinding heat accumulation of the lightweight structure mirror does not generate an elastic air film, and the weight reduction hole and the machine tool worktable are always kept in a non-closed state, thereby shortening the subsequent polishing time and improving the processing efficiency of the mirror. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of the lightweight reflector grinding thermal expansion suppression device provided by the present invention;

[0023] Figure 2 A schematic diagram of the lightweight reflector grinding thermal expansion suppression device provided by the present invention (reflector not shown).

[0024] Figure 3 A cross-sectional view of the lightweight mirror grinding thermal expansion suppression device provided by the present invention;

[0025] Figure 4 The schematic diagram of the mounting base is shown.

[0026] Figure 5 The schematic diagram of the clamping mechanism is shown.

[0027] In the diagram: 1-Mounting base; 1-1 Horizontal transverse channel; 1-2 Vertical channel; 1-3 Horizontal longitudinal channel;

[0028] 2-Handle bracket; 3-Connecting rod; 4-Sealant; 5-Sealing gasket; 6-Reflector; 7-Locking screw; 8-Flexible top block; 9-Adjusting screw; 10-Pressure nut; 11-Pressure plate. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Because the lightweight structure of the reflector has a large number of lightweight weight-reducing holes on its back, these holes form a sealed space with the existing machine tool table. When the reflector is ground, the accumulated grinding heat causes the air in the weight-reducing holes to expand, which is equivalent to forming a thin air film between the machine tool table and the reflector. This elastic air film directly affects the grinding accuracy and surface convergence certainty of the reflector element, increases the subsequent polishing time, reduces the processing efficiency of the reflector, and affects the large-scale engineering application of reflectors with lightweight structures.

[0033] In view of this, embodiments of the present invention disclose a lightweight reflector grinding thermal expansion suppression device, see appendix. Figure 1-3 Includes: mounting base 1 and clamping mechanism;

[0034] The mounting base 1 has a heat dissipation channel on the weight reduction hole corresponding to the lightweight structure of the reflector 6. The heat dissipation channel is connected to the outside. The heat accumulated during the grinding of the reflector 6 causes the air in the weight reduction hole to expand. The expanded air is discharged through the heat dissipation channel, keeping the weight reduction hole and the machine tool worktable in a non-closed state.

[0035] The mounting base 1 is provided with multiple sets of elastic clamping mechanisms around the reflector 6. The clamping mechanisms are used to elastically clamp the reflector 6 and fix it stably to the top of the mounting base 1.

[0036] By adopting this solution, a hot air evacuation channel that connects to the outside is set in the weight reduction hole on the corresponding reflector of the mounting base. This prevents the accumulation of grinding heat in the lightweight reflector from generating an elastic air film, and keeps the weight reduction hole and the machine tool table in a non-closed state. This shortens the subsequent polishing time and improves the processing efficiency of the reflector.

[0037] The flatness and parallelism of the upper and lower surfaces of the mounting base 1 need to be strictly controlled (better than 10μm) to ensure the clamping accuracy and machining accuracy of the components.

[0038] See appendix Figure 3 The mounting base 1 includes a mounting platform and a venting section. The mounting platform is provided with a venting section, and the venting section is arrayed with multiple sets of vertical channels 1-2. Each weight reduction hole corresponds to at least one of the vertical channels 1-2, ensuring that the lightweight weight reduction holes of the reflector 6 are unblocked outward through the vertical channels 1-2.

[0039] The mounting platform and the vent are connected by screws. The vent is located above the mounting base 1 and is made of low-density, rust-resistant metal material, which can greatly reduce the weight of the device.

[0040] See appendix Figure 4 The installation platform has multiple horizontal transverse channels 1-1 along the X direction and a horizontal longitudinal channel 1-3 connecting the horizontal transverse channels 1-1 along the Y direction. The vertical channel 1-2, the horizontal transverse channel 1-1 and the horizontal longitudinal channel 1-3 constitute the hot air evacuation channel.

[0041] Advantageously, the centers of the horizontal transverse channel 1-1 and the horizontal longitudinal channel 1-3 are on the same plane.

[0042] See appendix Figure 5 Each of the clamping mechanisms includes: a pressure plate 11, which is fixed to the mounting platform and located outside the reflector 6; and a flexible top block 8, which is connected to the side of the pressure plate 11 by adjusting screws 9 and faces and is used to elastically press against the reflector 6.

[0043] Specifically, the pressure plate 11 is L-shaped, with its bottom fixed to the mounting platform and its top side connected to the flexible top block 8. The pressure plate 11 is fixed to the upper surface of the mounting platform by a clamping nut 10, and the flexible top block 8 is mounted on the side of the pressure plate 11 by an adjusting screw 9. The reflector 6 is clamped and tightened by adjusting the adjusting screw 9, thereby improving the clamping rigidity of the reflector 6.

[0044] The pressure plate 11 is L-shaped, which can securely clamp the side of the reflector 6. Each pressure plate is matched with 2 to 4 clamping nuts 10 to ensure that the reflector 6 is securely clamped.

[0045] The pressure plate 11 is made of low-density rust-proof material, which can reduce the weight of the device to the greatest extent and prevent the device from rusting; the flexible top block 8 is made of flexible material, which can better achieve the wrapping of the clamping and avoid damage to components caused by local stress concentration.

[0046] Preferably, the pressure plates 11 are evenly distributed on the outer side of the reflector 6, and the number of pressure plates 11 is 4 to 8. Both the pressure plates 11 and the flexible top block 8 are lower than the reflector 6 to ensure that the cutting tool will not interfere with the device during component processing.

[0047] Advantageously, the adjusting screw 9 adopts a fine thread structure; it can realize micro-adjustment of the flexible top block 8, and can more precisely control the clamping stress, reducing the clamping deformation of the component caused by excessive clamping stress.

[0048] More advantageously, the connecting end of the adjusting screw 9 has a threaded hole, and a locking screw 7 is connected in the threaded hole. The locking screw 7 is connected to the flexible top block 8. The outer wall of the connecting end of the adjusting screw 9 has no thread, and the other end of the screw has a threaded groove, and the diameter of the other end is larger than the diameter of the connecting end.

[0049] The locking screw 7 is connected to the connecting end of the adjusting screw 9, so that the flexible top block 8 does not rotate when the adjusting screw 9 rotates. The flexible top block 8 is provided with a through hole, and the threads of the end of the locking screw 7 and the other end of the adjusting screw 9 are larger than the through hole of the flexible top block 8. The connecting end of the adjusting screw 9 is smaller than the flexible top block 8, which can ensure that the flexible top block 8 will not slip laterally with the adjusting screw 9.

[0050] Based on the above embodiments, a sealing gasket 5 is bonded to the top of the mounting platform, and the sealing gasket 5 has a through hole in the middle that is the same as that of the reflector 6; the top surface of the sealing gasket 5 and the side surface of the reflector 6 are both bonded with sealant 4, which plays a sealing role and ensures that the grinding fluid does not enter the bottom surface of the reflector 6 during grinding.

[0051] Preferably, one side of the sealing gasket 5 has an adhesive backing, which can firmly adhere to the surface of the mounting platform to ensure that the vertical channel 1-2 under the sealing gasket 5 is airtight.

[0052] Based on the above embodiments, the mounting base 1 is symmetrically provided with handles on two opposite sides along the X direction, and is located below the horizontal transverse channel 1-1. Each handle includes a handle bracket 2 and a connecting rod 3 connected to the handle bracket 2. The connecting rod 3 is larger in the middle and smaller at both ends, so that the connecting rod 3 cannot detach from the two handle brackets 2.

[0053] The mounting platform has mounting holes for mounting the mounting platform on the workbench.

[0054] The mounting platform of mounting base 1 can also be made of magnetic material, and can be fixed to the machine tool worktable by magnetic adsorption.

[0055] The working principle of the lightweight mirror grinding air thermal expansion suppression device provided by this invention is as follows:

[0056] The lightweight reflector is securely clamped onto the mounting base 1 by the locking screw 7, the flexible top block 8, the adjusting screw 9, the clamping nut 10, and the pressure plate 11. When the reflector element is ground, the sealant 4 and the sealing gasket 5 ensure that the grinding fluid will not enter the bottom of the reflector and lift the element. When the grinding heat generated during grinding causes the air in the lightweight weight reduction hole of the reflector 6 to expand, the expanded air can be dispersed into the air through the vertical channel 1-2, the horizontal transverse channel 1-1, and the horizontal longitudinal channel 1-3 provided on the mounting base 1. This prevents the expanded air from forming an elastic air film between the reflector 6 and the mounting base 1, suppresses the thermal expansion of the lightweight reflector, improves the grinding accuracy and processing certainty of the element, and improves the overall processing efficiency of the element.

[0057] The lightweight mirror grinding air thermal expansion suppression device of the present invention includes the following steps in use:

[0058] S1 Preparation before installation: Place the reflector 6 on the sealing gasket 5, draw a line on the sealing gasket 5 along the edge of the reflector 6, and cut off the middle area of ​​the line drawn on the sealing gasket 5 to ensure that the shape of the cut part is the same as the bottom surface of the reflector 6.

[0059] S2 base installation: Install the handle bracket 2 and the connecting rod 3 on the mounting base 1, ensuring that the connecting rod 3 does not fall off between the two handle brackets 2, and then attach the sealing gasket 5 to the upper surface of the mounting base 1;

[0060] S3 Component Clamping: Place the reflector 6 on the mounting base 1, so that the bottom surface of the reflector 6 is located within the cutting area of ​​the sealing gasket 5 in the above step. Use the clamping nut 10 to firmly connect the pressure plate 11 along the edge of the reflector 6 to the mounting base 1; rotate the adjusting screw 9 so that the flexible top block 8 presses the reflector 6 tightly, ensuring that the reflector 6 is clamped securely.

[0061] S4 Apply sealant: Apply sealant to the gap between the reflector 6 and the sealing gasket 5 to ensure that the grinding fluid does not enter the bottom of the reflector 6;

[0062] S5 Installation device: Lift the connecting rod 3 and place the device on the machine tool workbench, and fix it on the machine tool workbench by screw connection or magnetic adsorption.

[0063] Compared with the prior art, the lightweight structure mirror grinding air thermal expansion suppression device disclosed in this invention has the following advantages: This invention achieves high-rigidity clamping of the mirror with a lightweight structure, reduces clamping stress, avoids the influence of elastic air film caused by grinding heat accumulation on the component processing accuracy and processing determinism, improves the component processing accuracy and overall processing efficiency, and plays an important role in realizing ultra-precision optical manufacturing of large-aperture mirror components.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mirror grinding thermal expansion suppression device of a lightweight structure, characterized by comprising: include: Mounting base (1), the mounting base (1) has a hot air evacuation channel on the weight reduction hole corresponding to the lightweight structure of the reflector (6) at the top. The hot air evacuation channel is connected to the outside. The heat accumulated during the grinding of the reflector (6) causes the air in the weight reduction hole to expand. The expanded air is discharged through the hot air evacuation channel, keeping the weight reduction hole and the machine tool worktable in a non-closed state. The mounting base (1) is provided with multiple sets of elastic clamping mechanisms around the reflector (6). The clamping mechanisms are used to elastically clamp the reflector (6) and fix it stably to the top of the mounting base (1). The mounting base (1) includes a mounting platform and a ventilated part. The mounting platform is provided with a ventilated part on top. The ventilated part is arrayed with multiple sets of vertical channels (1-2), and each weight reduction hole corresponds to at least one of the vertical channels (1-2). The installation platform has multiple horizontal transverse channels (1-1) along the X direction and a horizontal longitudinal channel (1-3) connecting the horizontal transverse channels (1-1) along the Y direction. The vertical channel (1-2), the horizontal transverse channel (1-1), and the horizontal longitudinal channel (1-3) constitute the hot air evacuation channel. Each set of clamping mechanisms includes: a pressure plate (11) fixed to the mounting platform and located outside the reflector (6); and a flexible top block (8) connected to the side of the pressure plate (11) by an adjusting screw (9) and facing and used to elastically press against the reflector (6).

2. The mirror grinding thermal expansion suppression device of claim 1, wherein The centers of the horizontal transverse channel (1-1) and the horizontal longitudinal channel (1-3) are on the same plane.

3. The lightweight mirror grinding thermal expansion suppression device according to claim 2, characterized in that, The pressure plate (11) is L-shaped, with its bottom fixed to the mounting platform and its top side connected to the flexible top block (8).

4. The lightweight mirror grinding thermal expansion suppression device according to claim 3, characterized in that, The adjusting screw (9) has a fine thread structure.

5. The lightweight mirror grinding thermal expansion suppression device according to claim 4, characterized in that, The adjusting screw (9) has a threaded hole in its connecting end, and a locking screw (7) is connected in the threaded hole. The locking screw (7) is connected to the flexible top block (8). The outer wall of the connecting end of the adjusting screw (9) has no thread, and the other end of the screw has a threaded groove, and the diameter of the other end is larger than the diameter of the connecting end.

6. The lightweight mirror grinding thermal expansion suppression device according to any one of claims 1-5, characterized in that, A sealing gasket (5) is bonded to the top of the mounting platform, and the sealing gasket (5) has a through hole in the middle that is the same as that of the reflector (6); the top surface of the sealing gasket (5) and the side surface of the reflector (6) are both bonded with sealant (4).

7. The lightweight mirror grinding thermal expansion suppression device according to any one of claims 1-5, characterized in that, The mounting base (1) is symmetrically provided with handles on two opposite sides along the X direction and located below the horizontal transverse channel (1-1). The handles include handle brackets (2) and connecting rods (3) connected to the handle brackets (2).

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