Flexible clamping device and clamping method for grinding ceramic-based composite material

Abstract

The invention relates to the technical field of ceramic-based composite material machining, in particular to a flexible clamping device and method for ceramic-based composite material grinding machining. The device comprises a mounting adsorption assembly, a fixing assembly and a positioning assembly. The positioning assembly comprises a plurality of positioning blocks, and the positioning blocks are arranged on the flat plate part and clamped with the flat plate part; wherein the plurality of positioning blocks are adsorbed and fixed with the fixing assembly so as to realize the clamping of the flat plate part; the suction cup part forms an adsorption face capable of deforming in a self-adaptive mode on the limiting installation disc, and when the suction cup part is started, the suction cup generates elastic deformation according to the surface shape of the part, so that pressure is evenly distributed. Meanwhile, the fixing assembly forms a clamping surface on the limiting mounting disc, so that the clamping device and the part are combined into a whole; the positioning block is connected with the fixing assembly in a magnetic attraction mode, and the risk of generation of micro cracks is remarkably reduced; and low-stress clamping in the grinding machining process of the ceramic-based composite flat plate part is achieved.

Description

Technical Field

[0001] This invention relates to the field of ceramic matrix composite processing technology, and in particular to a flexible clamping device and clamping method for grinding ceramic matrix composites. Background Technology

[0002] Ceramic matrix composites are brittle, have rough and uneven surfaces, and contain micropores. During the grinding process, clamping is difficult, and the clamping methods used by some manufacturers can cause stress concentration. However, the disadvantage of ceramic matrix composites is that they are brittle and may crack or even break under stress, leading to material failure.

[0003] In the prior art, special fixtures for ceramic matrix composite flat plate parts of different shapes and sizes have been designed to reduce stress concentration. However, the designed fixtures are not compatible, and different sizes of fixtures need to be designed and manufactured for parts of different shapes and sizes.

[0004] In existing technologies, low-melting-point solids are used as curing agents for stress-free clamping of flat parts. These methods involve using low-melting-point solids as curing agents, cooling to adhere the workpiece, heating to melt it after processing, and then removing the workpiece. However, ceramic matrix composites have micropores on their surface, allowing the curing agent to penetrate into the material before solidification. After processing, heating and removing the workpiece makes it difficult to identify whether any curing agent remains inside the part. Excess curing agent affects material properties, and further heating may cause it to seep out, making it impossible to detect any residual curing agent and affecting the surface quality of the part. Summary of the Invention

[0005] The main objective of this invention is to provide a flexible clamping device and clamping method for grinding ceramic matrix composites, aiming to solve the problem that existing clamping devices and methods may cause cracks on the surface of parts during the clamping process.

[0006] To achieve the above objectives, the present invention provides a flexible clamping device for grinding ceramic matrix composites, the device being used to clamp ceramic matrix composite flat parts, the device comprising: The mounting assembly includes a limiting mounting plate and a suction cup component. The suction cup component is disposed on the limiting mounting plate and is used to adsorb the flat plate component. A fixing component is spliced ​​with the limiting mounting plate, and the upper surfaces of the fixing component and the limiting mounting plate are on the same horizontal plane to form a clamping surface. The positioning component includes several positioning blocks. The flat plate part is mounted on the clamping surface and is attracted by the suction cup part. The several positioning blocks are disposed on the flat plate part and clamp the flat plate part. In this process, several of the positioning blocks are adsorbed and fixed to the fixing components to achieve the clamping of the flat plate parts.

[0007] Optionally, the limiting mounting plate has a slot, the suction cup part is disposed in the slot, and the limiting mounting plate is connected to a vacuum pump through a pipeline to realize the suction cup part adsorption of the flat plate part.

[0008] Optionally, the fixing component includes a first fixing part, a second fixing part, a third fixing part, and a fourth fixing part. The limiting mounting plate has a groove, and the first fixing part, the second fixing part, the third fixing part, and the fourth fixing part are all provided with bosses. The second fixing part, the third fixing part, and the fourth fixing part are spliced ​​to the limiting mounting plate through the bosses and the grooves.

[0009] Optionally, the upper surface of the suction cup component is higher than the upper surface of the limiting mounting plate to form a buffer dimension, the buffer dimension being in the range of 1mm to 3mm.

[0010] Optionally, the upper surface of the limiting mounting plate is coated with a friction coating.

[0011] Optionally, the device further includes a displacement sensor, and the positioning block is provided with a plurality of marker points, the displacement sensor being used to monitor the displacement changes of the marker points.

[0012] Optionally, the device further includes a vacuum recorder for recording the vacuum level of the flat panel component.

[0013] A clamping method includes the following steps: The ceramic-based composite flat plate part is placed above the suction cup part, so that the flat plate part completely covers the suction cup part, and the edge of the flat plate part is located above the fixing component. The suction cup component is attracted and moves the flat component down together until the lower end face of the flat component contacts the clamping surface. Several positioning blocks are abutted and installed on the flat plate part, and then the positioning blocks are attracted and fixed to the limiting mounting plate to complete one clamping process.

[0014] Optionally, after the lower end face of the flat part contacts the clamping surface, the vacuum pump maintains a vacuum level of 85 kPa or higher for more than 1 minute.

[0015] Optionally, after completing one clamping process, the process further includes: performing a second grinding process on the flat part; after the first grinding process is completed, removing the positioning blocks that were attached and fixed to the limiting mounting plate during the first clamping process; replacing the positioning blocks one by one and installing the positioning blocks abutting against the flat part; then attaching and fixing the positioning blocks to the limiting mounting plate to complete the second clamping process; and performing a second grinding process after the second clamping process is completed.

[0016] This invention proposes a flexible clamping device and method for grinding ceramic matrix composites. By combining vacuum adsorption with flexible positioning, the stress on ceramic matrix composite flat parts during clamping is dispersed. Specifically, the suction cup component forms an adaptively deformable adsorption surface on the limiting mounting plate. When the suction cup component is activated, it elastically deforms according to the surface shape of the part, resulting in uniform pressure distribution. Simultaneously, the fixing component forms a clamping surface on the limiting mounting plate, integrating the clamping device and the part into a single unit. Multiple interchangeable positioning blocks are preferably connected to the fixing component via magnetic attraction, adapting to the positioning requirements of parts of different sizes while avoiding localized stress concentration caused by traditional mechanical clamping. This structure of surface contact adsorption and multi-point flexible positioning disperses the clamping force across the entire contact surface, significantly reducing the risk of microcrack formation. It achieves low-stress clamping during the grinding process of ceramic matrix composite flat parts, demonstrating strong practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the clamping device in Embodiment 1 of the present invention; Figure 2 This is a detailed structural diagram of the adsorption assembly installed in Embodiment 1 of the present invention; Figure 3 This is a side view showing the detailed structure of the adsorption assembly installed in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of a single clamping process in Embodiment 4 of the present invention; Figure 5 This is a schematic diagram of the secondary clamping process in Embodiment 4 of the present invention; Figure 6 This is a flowchart of the clamping method in Embodiment 4 of the present invention.

[0018] Figure label: 1-Suction cup component, 2-Limit mounting plate, 4-First fixing component, 5-Second fixing component, 6-Third fixing component, 7-Fourth fixing component, 9-Displacement sensor, 10-Vacuum recorder, 21-Slot, 22-Friction coating, 91-First marking point, 92-Second marking point, 93-Third marking point, 94-Fourth marking point, 31-Positioning block I, 32-Positioning block II, 33-Positioning block III, 34-Positioning block IV, 35-Positioning block V, 36-Positioning block VI, 37-Positioning block VII, 38-Positioning block VIII, 39-Positioning block IX, 310-Positioning block X.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] Example 1: Please refer to the attached document as well. Figures 1 to 3 This embodiment provides a flexible clamping device for grinding ceramic matrix composites. The device is used to clamp ceramic matrix composite flat parts and includes: The installation of the adsorption assembly includes a limiting mounting plate 2 and a suction cup component 1. The suction cup component 1 is disposed on the limiting mounting plate 2 and is used to adsorb the flat plate component. A fixing component is provided, which is spliced ​​with the limiting mounting plate 2, and the upper surfaces of the fixing component and the limiting mounting plate 2 are on the same horizontal plane to form a clamping surface. The positioning component includes several positioning blocks. The flat plate part is mounted on the clamping surface and is attracted by the suction cup part 1. The several positioning blocks are disposed on the flat plate part and clamp the flat plate part. In this process, several of the positioning blocks are adsorbed and fixed to the fixing components to achieve the clamping of the flat plate parts.

[0025] It should be noted that existing technologies have designed specialized fixtures for ceramic matrix composite flat parts of different shapes and sizes to reduce stress concentration. However, these fixtures lack compatibility, requiring different sized fixtures to be designed and manufactured for parts of different shapes and sizes. Furthermore, the fixture device and the different clamping methods used can adversely affect the surface quality of the parts. Based on these issues, this embodiment proposes a flexible clamping device for grinding ceramic matrix composites. This device disperses the force on the ceramic matrix composite flat parts during clamping by combining vacuum adsorption with flexible positioning. Specifically, the suction cup part 1 forms an adaptively deformable adsorption surface on the limiting mounting plate 2. When the suction cup part 1 is activated, the suction cup undergoes elastic deformation according to the surface shape of the part, resulting in a uniform pressure distribution. Simultaneously, the fixing component forms a clamping surface on the limiting mounting plate 2 to integrate the clamping device and the part into a single unit. Multiple interchangeable positioning blocks are preferably connected to the fixing component via magnetic attraction, which can adapt to the positioning requirements of parts of different sizes and avoid localized stress concentration caused by traditional mechanical clamping. This structure, which combines surface contact adsorption with multi-point flexible positioning, disperses the clamping force across the entire contact surface, significantly reducing the risk of microcrack formation. It enables low-stress clamping of ceramic-based composite flat parts during grinding, demonstrating strong practicality.

[0026] In some embodiments, the suction cup component 1 is preferably a silicone suction cup; In some embodiments, the dimensions and sizes of the positioning blocks are different to meet the positioning needs of parts of different sizes and shapes.

[0027] In this embodiment, the limiting mounting plate 2 has a slot 21, the suction cup part 1 is disposed in the slot 21, and the limiting mounting plate 2 is connected to a vacuum pump through a pipeline to realize the suction cup part 1 adsorption of the flat plate part.

[0028] Understandably, the slot 21 structure on the limiting mounting plate 2 provides a precise installation positioning reference for the suction cup part 1. After the suction cup part 1 is embedded in the slot 21, it forms an installation adsorption assembly with the limiting mounting plate 2. This embedded design not only ensures the stability of the suction cup during operation, but also avoids the edge warping problem that may occur with traditional external suction cups.

[0029] When suction cup component 1 is activated, a negative pressure environment is created inside the suction cup. Its flexible material undergoes adaptive deformation to conform to the lower surface of the ceramic matrix composite flat component. This surface contact adsorption method transforms the concentrated load of traditional point clamping into a uniformly distributed surface load, fundamentally eliminating the risk of excessive local stress. During adsorption, the elastic properties of the suction cup material allow it to adaptively adjust according to the microscopic unevenness of the component surface, ensuring uniform distribution of contact pressure. At the same time, the rigid support of the limiting mounting plate 2 prevents pressure imbalance caused by excessive deformation of the suction cup.

[0030] It is also understandable that the flexible nature of vacuum adsorption allows the device to be compatible with parts of varying thicknesses and slight deformations, significantly improving clamping adaptability. This means that a single set of fixtures can be used to process ceramic matrix composite flat parts of different sizes and shapes. Furthermore, the modular design of the positioning components enables rapid changeover; simply changing the suction cup part 1 or the positioning block of different specifications can accommodate the processing needs of parts of various sizes, greatly improving the equipment's versatility and production efficiency. After grinding, this clamping device also offers significant advantages for subsequent cleaning processes.

[0031] In some embodiments, the maximum diameter of the outer ring of the suction cup part 1 is smaller than the diameter of the slot 21.

[0032] In this embodiment, the fixing component includes a first fixing part 4, a second fixing part 5, a third fixing part 6, and a fourth fixing part 7. The limiting mounting plate 2 has a groove, and the first fixing part 4, the second fixing part 5, the third fixing part 6, and the fourth fixing part 7 are all provided with bosses. The second fixing part 5, the third fixing part 6, and the fourth fixing part 7 are spliced ​​together on the limiting mounting plate 2 through the bosses and the grooves.

[0033] Reference Appendix Figure 1 It is understood that the first fixing part 4, the second fixing part 5, the third fixing part 6, and the fourth fixing part 7 in this embodiment are block structures of different sizes. Their essence is preferably a permanent magnet disk, an electronically controlled magnetic disk, or other structural components with controllable magnetism. In some embodiments, the groove is L-shaped, and similarly, the boss is also L-shaped for adaptive matching. Preferably, the first fixing part 4, the second fixing part 5, the third fixing part 6, and the fourth fixing part 7 are spliced ​​together in different orientations to form a rectangular structure. The limiting mounting plate 2 is then placed at the geometric center of this rectangular structure. More preferably, the first fixing part 4, the second fixing part 5, the third fixing part 6, and the fourth fixing part 7 can also be spliced ​​together by setting grooves and bosses to avoid possible angular offsets. Specifically, for example, another groove is set on the second fixing part 5 and spliced ​​with the boss on the adjacent first fixing part 4 or third fixing part 6. It is understood that the position of the boss and the groove is not specifically limited, and the type of setting can be adjusted according to actual needs.

[0034] In summary, the L-shaped grooves around the limiting mounting plate 2 and the precision-machined L-shaped bosses on the bottom of the four independent fixing parts constitute the core mechanical interface. During assembly, the operator sequentially inserts the second, third, and fourth fixing parts 7 into the grooves via the bosses to achieve physical splicing, forming a rectangular support frame with the limiting mounting plate 2 as the geometric center. This splicing mechanism is not a simple stacking, but rather automatically corrects the relative positions between the parts through the three-dimensional positioning characteristics of the L-shaped interface. When the boss slides into the groove, its vertical and horizontal planes simultaneously generate constraints, effectively suppressing angular offsets and planar misalignments during assembly, ensuring that the four fixing parts are strictly flush with the upper surface of the limiting mounting plate 2, jointly constructing a high-precision clamping reference plane. Based on the non-interference characteristic of the L-shaped mating surface, the splicing has a micron-level elastic deformation space reserved at the interface, which can effectively absorb assembly stress and prevent the ceramic matrix composite material from bearing additional bending moments due to frame deformation.

[0035] In this embodiment, the upper surface of the suction cup component 1 is higher than the upper surface of the limiting mounting plate 2 to form a buffer size, the buffer size being in the range of 1mm to 3mm.

[0036] It is understandable that the buffer size range is only a preferred range, and can be adaptively adjusted to accommodate different parts. It is also understandable that when the part is installed, the vacuum pump is turned on, and the part is subjected to a downward force F=A*P / μ. The suction cup part 1, subjected to this downward force, adheres tightly to the part and adaptively deforms downwards, bringing the part into contact with the upper surface of the limiting plate. Here, F is the pressure exerted on the part (unit: Newtons), A is the coverage area of ​​the suction cup part 1 and the part (unit: square meters), P is the vacuum level (unit: kPa), and μ is the safety factor.

[0037] It is also understandable that the buffer size allows the suction cup to compensate for the microscopic unevenness of the part surface through its own elastic deformation while maintaining sufficient suction force, thus ensuring a uniform distribution of contact pressure. In practical applications, the suction cup undergoes three stages during deformation: the initial contact stage, where the top of the suction cup first contacts the part; the uniform deformation stage, where the suction cup presses down uniformly as the vacuum level increases; and the final stabilization stage, where the bottom surface of the part is in complete contact with the limiting mounting plate 2, at which point the suction cup still maintains appropriate residual elastic force to maintain stable suction. This progressive contact method effectively avoids the impact stress common in traditional rigid clamping, making it particularly suitable for the precision machining of brittle materials. In addition, the design of the buffer size also considers dynamic factors during the machining process, such as the micro-vibrations caused by cutting forces. The elastic deformation of the suction cup can absorb these dynamic loads, preventing stress concentration from causing damage to the part, and maximizing the protection of brittle workpieces while ensuring positioning accuracy.

[0038] In this embodiment, the upper surface of the limiting mounting plate 2 is coated with a friction coating 22. The friction coating 22 can effectively increase the friction between the part and the limiting mounting plate 2, and the increase in friction helps to form a mechanical interlocking effect; at the same time, the polar molecules in the coating material generate van der Waals forces with the ceramic surface, establishing an adsorption layer at the nanoscale; and transforming the sliding friction between the originally smooth metal plate surface and the brittle material into static friction, so that the part remains relatively stationary under grinding vibration load.

[0039] In some embodiments, the friction coating 22 is preferably a polyurethane-modified epoxy resin, polyamide-imide, nickel-based tungsten carbide, or polytetrafluoroethylene-molybdenum disulfide, etc.

[0040] Example 2: In this embodiment, the device further includes a displacement sensor 9. The positioning block is provided with a plurality of marker points, and the displacement sensor 9 is used to monitor the displacement changes of the marker points.

[0041] It is understood that the clamping device in this embodiment also includes a control module, which is connected to the displacement sensor 9. When the number of marker points collected by the displacement sensor 9 exceeds a threshold set in the control module, the grinding process is paused. It is also understood that the displacement sensor 9 preferably continuously tracks the three-dimensional coordinate changes of the marker points through non-contact optical measurement (such as laser interferometry).

[0042] It is also understandable that when vacuum adsorption is initiated, the control module first records the initial position of the marker point as a reference. During the grinding process, if the part undergoes micro-deformation due to cutting vibration, clamping stress, or internal material defects, it will cause the positioning block to shift. At this time, the displacement sensor 9 captures the positional offset of the marker point. The offset signal corresponding to this positional offset is transmitted to the control module in real time and dynamically compared with the preset safety threshold. When the displacement of any marker point exceeds the threshold, the control module immediately sends an emergency stop command to the grinding machine and cuts off the power to the vacuum pump to freeze the processing state. By accumulating displacement data over a long period of time, a digital twin model of the processing process can be established to optimize process parameters. The arrangement scheme of multiple marker points can identify the complex deformation patterns of the part, providing a basis for fixture improvement. The real-time monitoring function significantly reduces the frequency of manual inspection and improves production efficiency. The device in this embodiment significantly improves processing efficiency and eliminates the need for multiple calibrations.

[0043] In some embodiments, the control module is preferably a PLC control system, an embedded industrial control system, an industrial PC system, etc., such as the Beckhoff CX9020 series, NIcRIO-9045, etc.

[0044] Example 3: In this embodiment, The device also includes a vacuum recorder 10, which records the vacuum level of the flat panel component. The vacuum recorder 10 is connected to the control module via signal transmission.

[0045] Understandably, the vacuum recorder 10 continuously collects vacuum pressure data inside the suction cup via sensors. This data is converted into standard electrical signals by a signal conditioning circuit and then transmitted to the control module. The control module analyzes the vacuum level change trend in real time. When the vacuum level is detected to be lower than a preset safety threshold (e.g., 85 kPa), a protection mechanism is immediately triggered, pausing the processing and issuing an alarm. The vacuum recorder 10 preferably uses a high-precision silicon piezoresistive sensor. It is also understandable that the clamping status of the device is monitored and analyzed in real time by comparing the vacuum detection and recording device with the displacement sensor 9, ensuring the reliability of the clamping.

[0046] Example 4: Please refer to the attached document as well. Figures 4 to 6 This embodiment provides a clamping method, including the following steps: The ceramic-based composite flat plate part is placed above the suction cup part 1, so that the flat plate part completely covers the suction cup part 1, and the edge of the flat plate part is located above the fixing component. The suction cup part 1 is attracted and moves the flat plate part down together until the lower end face of the flat plate part contacts the clamping surface. Several positioning blocks are abutted and installed on the flat plate part, and then the several positioning blocks are adsorbed and fixed to the limiting mounting plate 2 to complete one clamping process.

[0047] Understandably, during the clamping stage, the ceramic-based composite flat part is first precisely placed above the suction cup assembly, ensuring that the part completely covers the suction cup and its edges hang over the fixing assembly. When the vacuum pump is started, the suction cup undergoes uniform elastic deformation under negative pressure, causing the part to move smoothly down until it comes into complete contact with the clamping surface formed by the limiting mounting plate 2 and the fixing assembly. This process achieves stress-free bonding between the part and the clamping surface through the flexible properties of the suction cup material.

[0048] Subsequently, the preferred method is to follow the appendix. Figure 4 The positioning blocks are installed in a specific sequence. These positioning blocks first contact and position themselves against the edge of the part, and then are magnetically fixed to the limiting mounting plate 2, forming a stable three-point positioning system. After the first clamping is completed, the first grinding process is performed. After entering the second clamping stage, the operator follows the attached... Figure 5 The process plan shown gradually changes and increases the position and number of positioning blocks, and balances the processing stress by redistributing constraint points. This dynamic adjustment strategy ensures that the part is always in the optimal stress state during the two clamping cycles.

[0049] Throughout the process, displacement sensor 9 monitors the position changes of the marked points on the positioning block in real time, and vacuum recorder 10 continuously tracks the adsorption state. These data are fed back to the control system to ensure clamping reliability. This method not only solves the stress concentration problem in traditional clamping processes, but also brings several technological improvements: the staged clamping strategy effectively controls residual stress from machining and improves dimensional accuracy stability; the combination of flexible adsorption and rigid positioning ensures clamping rigidity and avoids internal damage caused by over-constraint; the repeatability of the process is significantly improved, and different batches of parts can obtain consistent clamping results.

[0050] In some embodiments, the positioning component includes the following: Figure 4 With appendix Figure 5 Positioning blocks I 31, II 32, III 33, IV 34, V 35, VI 36, VII 37, VIII 38, IX 39 and X 310 are shown.

[0051] In some embodiments, the marker points include a first marker point 91 and a second marker point 92 during a single clamping process; and a third marker point 93 and a fourth marker point 94 during a second clamping process.

[0052] To make the clamping process in this embodiment clearer, it is described in conjunction with the attached diagram. Figure 4 With appendix Figure 5 The content provides a detailed explanation of the preferred complete processing cases.

[0053] Place the ceramic matrix composite flat plate part to be processed above the suction cup part 1, and adjust the position of the flat plate part so that it completely covers the suction cup part 1. The four edges of the flat plate part are respectively located above the first fixed part, the second fixed part 5, the third fixed part 6 and the fourth fixed part 7.

[0054] Turn on the vacuum pump, and the suction cup part 1 moves down, which in turn moves the flat plate part down until the lower surface of the flat plate part comes into contact with the clamping surface formed by the limiting mounting plate 2, a first fixing part, a second fixing part 5, a third fixing part 6, and a fourth fixing part 7.

[0055] The vacuum pump achieves a vacuum level of 85 kPa or higher and maintains it for more than 1 minute, while the control unit of the fixed component is in the off position (the fixed component is non-magnetic). According to... Figure 1 Position the positioning blocks inside the positioning assembly, adjust positioning block I 31 so that its side is in close contact with the side of the flat part, start the knob of the first fixing part 4 to activate the magnetism of the first fixing part 4, and fix the position of positioning block I 31; fix positioning block II 32 and positioning block III 33 in sequence according to the above method.

[0056] The vacuum level of the parts is recorded in real time during the processing. Processing is paused when the vacuum level is below 85 kPa.

[0057] Set a first marker point 91 and a second marker point 92 on the positioning block involved in clamping, such as Figure 4 As shown, displacement sensor 9 is used to monitor the position of the marker point. If the displacement of the marker point changes by more than 0.01 mm, the processing is paused.

[0058] Grinding of the flat part begins; the machining path is shown below. Figure 4 In area 1, process the area to the target size (grind the upper surface and the edge), pause grinding, clean the processing area, and thus complete one clamping process and one grinding process.

[0059] Close the first fixing part 4 and remove the positioning block I31.

[0060] Close the second fixing part 5, remove the positioning block II 32, and place the positioning blocks IV 34 and V 35 close to the flat part, according to... Figure 5 Place the parts, open the second fixing part 5, and fix the positioning block IV34 and positioning block V35.

[0061] Close the third fixing part 6, remove the positioning block Ⅲ33, and place the positioning blocks Ⅵ36 and Ⅶ37 close to the part, according to... Figure 5 Place the parts, open the third fixing part 6, and fix the positioning block VI36 and positioning block VII37.

[0062] Positioning blocks VIII38, IX39, and X310 close to the flat plate part, according to... Figure 5 Place them in the correct positions and activate the fourth fixing part 7 knob to make it magnetic, thereby fixing the positioning blocks VIII 38, IX 39, and X 310.

[0063] The vacuum level of the parts is recorded in real time during the processing. Processing is paused when the vacuum level is below 85 kPa.

[0064] Set a third marker point 93 and a fourth marker point 94 on the positioning block involved in clamping, such as Figure 5 The position of the marker point is monitored using displacement sensor 9. If the displacement of the marker point changes by more than 0.01 mm, the processing is paused.

[0065] The part is then ground; the machining path is shown below. Figure 5 In area 2, process the machining in the order of machining trajectory 2, machining trajectory 3, and machining trajectory 4 until the position of area 2 is machined to the target size (grind the upper surface and grind the edge). After machining is completed, clean the machining area. This completes the secondary clamping process and the secondary grinding process.

[0066] In this embodiment, after the lower end face of the flat part contacts the clamping surface, the vacuum pump maintains a vacuum level above 85 kPa for more than 1 minute. It can be understood that maintaining a constant vacuum keeps the contact thermal resistance between the part and the clamping surface stable, improving the heat conduction conditions during grinding; extending the holding time helps to expel trace amounts of air from the contact interface, which helps to prevent the air cushion effect during the processing.

[0067] After completing one clamping process, the process further includes: performing a second grinding process on the flat part; after the first grinding process is completed, removing the positioning blocks that were attached and fixed to the limiting mounting plate 2 during the first clamping process; replacing the positioning blocks one by one and installing the positioning blocks abutting against the flat part; and then attaching and fixing the positioning blocks to the limiting mounting plate 2 to complete the second clamping process; and performing a second grinding process after the second clamping process is completed.

[0068] Understandably, after the first clamping stage, the flat part undergoes preliminary grinding to remove most of the material excess. At this stage, the placement strategy of the locating blocks focuses on ensuring basic clamping rigidity. After the first grinding, the system enters the crucial second clamping stage. The operator replaces the locating blocks in a specific sequence and performs precise stress rebalancing adjustments based on the part's condition after the first machining. During the second clamping process, each locating block is precisely abutted to ensure uniform contact pressure with the part surface. It is then fixed to the limiting mounting plate 2 via magnetic attraction. This step-by-step clamping strategy progressively optimizes the constraint state of the part.

[0069] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A flexible clamping device for grinding ceramic matrix composites, characterized in that, The device is used for clamping ceramic matrix composite flat parts, and the device includes: The mounting assembly includes a limiting mounting plate and a suction cup component. The suction cup component is disposed on the limiting mounting plate and is used to adsorb the flat plate component. A fixing component is spliced ​​with the limiting mounting plate, and the upper surfaces of the fixing component and the limiting mounting plate are on the same horizontal plane to form a clamping surface. The positioning component includes several positioning blocks. The flat plate part is mounted on the clamping surface and is attracted by the suction cup part. The several positioning blocks are disposed on the flat plate part and clamp the flat plate part. In this process, several of the positioning blocks are adsorbed and fixed to the fixing components to achieve the clamping of the flat plate parts.

2. The flexible clamping device for grinding ceramic matrix composites as described in claim 1, characterized in that, The limiting mounting plate has a slot, and the suction cup part is disposed in the slot. The limiting mounting plate is connected to a vacuum pump through a pipeline to enable the suction cup part to adsorb the flat plate part.

3. The flexible clamping device for grinding ceramic matrix composites as described in claim 1, characterized in that, The fixing assembly includes a first fixing part, a second fixing part, a third fixing part, and a fourth fixing part. The limiting mounting plate has a groove. The first fixing part, the second fixing part, the third fixing part, and the fourth fixing part are all provided with bosses. The second fixing part, the third fixing part, and the fourth fixing part are connected to the limiting mounting plate by the bosses and the grooves.

4. The flexible clamping device for grinding ceramic matrix composites as described in claim 1, characterized in that, The upper surface of the suction cup component is higher than the upper surface of the limiting mounting plate to form a buffer dimension, the buffer dimension being in the range of 1mm to 3mm.

5. The flexible clamping device for grinding ceramic matrix composites as described in claim 1, characterized in that, The upper surface of the limiting mounting plate is coated with a friction coating.

6. The flexible clamping device for grinding ceramic matrix composites as described in claim 2, characterized in that, The device also includes a displacement sensor, and the positioning block is provided with a number of marker points. The displacement sensor is used to monitor the displacement changes of the marker points.

7. The flexible clamping device for grinding ceramic matrix composites as described in claim 6, characterized in that, The device also includes a vacuum recorder for recording the vacuum level of the flat panel component.

8. A clamping method, characterized in that, A flexible clamping device for grinding ceramic matrix composites according to claim 6 or 7 includes the following steps: The ceramic-based composite flat plate part is placed above the suction cup part, so that the flat plate part completely covers the suction cup part, and the edge of the flat plate part is located above the fixing component. The suction cup component is attracted and moves the flat component down together until the lower end face of the flat component contacts the clamping surface. Several positioning blocks are abutted and installed on the flat plate part, and then the positioning blocks are attracted and fixed to the limiting mounting plate to complete one clamping process.

9. The clamping method as described in claim 8, characterized in that, After the lower end face of the flat part contacts the clamping surface, the vacuum pump maintains a vacuum level of 85 kPa or higher for more than 1 minute.

10. The clamping method as described in claim 8, characterized in that, After completing one clamping process, the following is also included: The flat plate part is subjected to secondary grinding. After the primary grinding is completed, the positioning block that was attached and fixed to the limiting mounting plate during the primary clamping process is removed. The positioning blocks are replaced one by one and installed on the flat plate part. The positioning blocks are then attached and fixed to the limiting mounting plate to complete the secondary clamping process. After the secondary clamping process is completed, the secondary grinding is performed.

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