A low-stress flexible clamping device and clamping method with flanging parts

Abstract

The present invention provides a low-stress flexible clamping device and clamping method for flanged parts. The device comprises a vacuum adsorption base, a support platform, a numerical control platform, a plastic film, a support material, a rotary joint, a heating module, a temperature sensing module, a force sensing module, a pressure pump, a vacuum pump, and a support material storage tank. The device utilizes the phase change of modified low-melting-point paraffin wax to achieve low-stress flexible clamping of flanged parts. The device achieves iso-stress flexible clamping of flanged parts by regulating the solidification range and speed of the modified low-melting-point paraffin wax. The device melts the modified low-melting-point paraffin wax to achieve stress relief for the parts after processing, reducing processing costs and avoiding difficulties such as repeated positioning caused by multiple clamping and unloading of the parts. The device and method are universally applicable and can be widely applied to traditional lathes, milling machines, grinders, and new laser processing machines.

Description

Technical Field

[0001] The present invention relates to the field of mechanical manufacturing, and in particular to a low-stress flexible clamping device with flanging parts and a clamping method. Background Art

[0002] Carbon fiber composite large-aperture antenna blanks are typically flanged parts. As core components of high-end equipment, large-aperture antennas are widely used in aviation, communications, weaponry, and other fields, and are a major national need. The accuracy and aperture of the antenna reflector directly impact key detector specifications such as spatial resolution, sensitivity, calibration accuracy, and polarization isolation. Therefore, the machining accuracy of large-aperture antenna reflectors is a crucial factor influencing high-performance detection systems.

[0003] Traditional clamping methods involve machining metal conformal molds or using multi-point support methods. The former has the disadvantages of high processing costs, long cycles, and complicated processing procedures, while the latter results in insufficient rigidity of parts during machining at unsupported locations, causing surface vibration of the parts, resulting in poor processing quality.

[0004] Part machining inevitably leads to residual stress. This internal residual stress can exacerbate the formation and propagation of internal defects and cracks, significantly reducing part lifespan. Therefore, post-machining stress relief heat treatment is essential for large parts. Application No. 2009201351368, a clamping system that uses a frozen liquid to clamp parts, introduces stress to the clamped parts due to temperatures below room temperature, and thus lacks stress relief. Application No. 2011104427549, a flexible clamping method based on liquid phase change, also fails to provide adequate surface protection and stress relief. For large-diameter satellite antennas requiring high surface precision, heat treatment to release residual stress may not result in surface accuracy that meets requirements. This necessitates multiple clamping and machining steps, making the process time-consuming, labor-intensive, and challenging. Summary of the Invention

[0005] In response to the aforementioned technical problems, a low-stress, flexible clamping device and method for flanged parts are provided. The present invention primarily utilizes low-stress, flexible clamping to reduce surface changes before and after clamping of flanged parts. The clamp allows for in-situ stress relief, avoiding multiple clamping of the part, simplifying the part manufacturing process, improving machining accuracy, and reducing costs.

[0006] The present invention discloses a low-stress flexible clamping device with a flanging part, comprising a vacuum adsorption base, a support platform, a numerical control platform, a plastic film, a support material, a rotary joint, a heating module, a temperature sensing module, a force sensing module, a pressure pump, a vacuum pump and a support material storage tank; wherein the vacuum adsorption base is connected to the vacuum pump, the support platform is installed inside the vacuum adsorption base, the vacuum adsorption base is fixed on the numerical control platform by vacuuming, the vacuum adsorption base is used to fix the support platform and the part to be processed, the output end of the support material storage tank is connected to the connection port of the outer wall of the support platform through the pressure pump and the rotary joint, the rotary joint realizes switching of the inflow / outflow of the support material by adjusting the rotation angle, the heating module is used to heat the support material to achieve stress relief treatment of the part to be processed and disassembly of the part, the plastic film is used to prevent direct contact between the support material and the part to be processed, the temperature sensing module is used to monitor the temperature of the support material, and the force sensing module is used to monitor the stress distribution of the support material during clamping and processing the part to be processed, and the output of the heating coil is adjusted based on the monitoring values ​​of the temperature sensing module and the force sensing module.

[0007] Furthermore, the shape of the support platform is designed according to the shape of the part to be processed to achieve equal stress clamping. The support platform is provided with a through hole along the axial direction, and the through hole serves as a vacuum adsorption channel for vacuum adsorption of the part to be processed; the side of the support platform has a radial through hole, which is used to support the overflow of the inner cavity gas formed by the support platform and the plastic film when the support material is filled; the sealing plug is used to block the radial through hole on the side of the support platform when the support material is added, so as to avoid the oxidation of the multi-walled carbon nanotubes by oxygen during the post-processing of the part to be processed.

[0008] Furthermore, the sealing plug is in the shape of a truncated cone.

[0009] Furthermore, the heating module is composed of several coils, including a strip heating module and a ring heating module. The strip heating module is installed on the inner side wall of the support platform, and the ring heating module is installed in a ring shape on the inner bottom surface of the support platform; the coil is a single body and can be controlled to switch independently to achieve precise control of the heating area. The switch of the coil is controlled by comprehensive feedback of the temperature sensor patch and the force sensor patch to achieve low-stress clamping of the parts to be processed.

[0010] Furthermore, the temperature sensing module includes a first temperature sensing patch group, a second temperature sensing patch group and a third temperature sensing patch group; the first temperature sensing patch group is attached to the back of the part to be processed, and the first temperature sensing patch group and the second temperature sensing patch group are respectively attached to the inner bottom surface and the inner side surface of the support platform. The first temperature sensing patch group, the second temperature sensing patch group and the third temperature sensing patch group are used to realize the temperature distribution law of the support material poured into the support platform, the stress relief post-processing and the temperature distribution detection during the processing process. The first temperature sensing patch group and the third temperature sensing patch group are arranged according to the leaf sequence law and the distance between two adjacent temperature sensing patches is a preset value.

[0011] Furthermore, the force sensing module includes a first force sensing patch group and a second force sensing patch group. The first force sensing patch group is arranged on the support platform and cooperates with the flange of the part to be processed. The second force sensing patch group is attached to the back of the part to be processed and is used to detect and monitor the stress distribution during clamping and processing. The force sensing patch is embedded in the gap between the temperature sensing patches.

[0012] Furthermore, one side of the plastic film has a heat-resistant adhesive that does not react with the part to be processed, which is used to perfectly fit the plastic film to the lower surface of the part to be processed, and the other side of the plastic film has a plurality of protrusions.

[0013] Furthermore, the supporting material is a low melting point phase change material, including paraffin wax with added multi-walled carbon nanotubes.

[0014] The present invention also provides a clamping method based on a low-stress flexible clamping device with a flanged part, the steps of which are as follows:

[0015] S1: Place the vacuum adsorption substrate on the CNC platform, and place the support platform on the vacuum adsorption substrate, turn on the vacuum pump to vacuum and fix it;

[0016] S2: Paste the force sensing patch on the back of the part to be processed in leaf order;

[0017] S3: Paste the temperature sensor patches on the inner surface of the support platform and the back of the workpiece to be processed in leaf order;

[0018] S4: Paste the plastic film on the back of the part to be processed;

[0019] S5: placing the part to be processed on the support platform, and making the lower surface of the flange of the part to be processed contact the concave platform on the upper surface of the support platform, turning on the vacuum pump to draw vacuum to fix it;

[0020] S6: Turn on the pressure pump to inject the liquid support material into the support platform through the rotary joint. Adjust the speed of the rotary joint injecting the support material and the switch of the coil in the heating module according to the temperature of the part and the support platform and the stress sensing patch.

[0021] S7: When the liquid level of the supporting material coincides with the notch on the rotary joint, the injection of the supporting material is stopped;

[0022] S8: According to the stress distribution on the surface of the part to be processed during the curing process of the support material, the switch of the heating coil is adjusted to achieve low-stress clamping of the part to be processed;

[0023] S9: Turn off the heating module and insert the sealing plug into the radial through hole on the side of the support platform;

[0024] S10: After the parts are processed, the heating module is turned on to heat up, keep warm, cool down, and keep warm for multiple cycles to achieve the goal of stress relief;

[0025] S11: Turn on the heating module to heat up until the support material melts, open the vacuum suction cup, and remove the parts to be processed.

[0026] Compared with the prior art, the present invention has the following advantages: (1) The device realizes low-stress flexible clamping of flanged parts by utilizing the phase change of modified low-melting-point paraffin wax; (2) The device realizes iso-stress flexible clamping of flanged parts by regulating the solidification range and speed of modified low-melting-point paraffin wax; (3) The device realizes stress relief of parts after processing by melting modified low-melting-point paraffin wax, thereby reducing processing costs and avoiding problems such as repeated positioning difficulties caused by multiple clamping and unloading of parts; (4) The clamping device and method are universal and can be widely used in traditional lathes, milling machines, grinders and new laser processing machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 A three-dimensional schematic diagram of the device.

[0029] Figure 2 It is a support platform with a heating module and pressure sensing patch.

[0030] Figure 3 This is a schematic diagram of the parts to be processed with pressure sensor patches and temperature sensor patches.

[0031] Figure 4 Schematic diagram of the parts to be processed.

[0032] Figure 5 Schematic diagram of plastic film.

[0033] In the figure: 1. Pressure pump; 2. Vacuum pump; 3. Support material storage tank; 4. CNC platform; 5. Vacuum adsorption base; 6. First rotary joint; 7. First sealing plug; 8. Plastic film; 9. Support platform; 10. Second rotary joint; 11. Parts to be processed; 12. Third rotary joint; 13. Second sealing plug; 14. Third sealing plug; 15. Fourth rotary joint; 16. First force sensing patch group; 17. Strip heating module; 18. Ring heating module; 19. First temperature sensing patch group; 20. Second temperature sensing patch group; 21. Third temperature sensing patch group; 22. Second force sensing patch group. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0038] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] The embodiment of the present invention discloses a low-stress flexible clamping device and method with flanging parts, which can be widely used in traditional lathes, milling machines, grinders and new laser processing machines for low-stress clamping of flanging parts.

[0042] like Figure 1 The embodiment of the present invention discloses a flexible low-stress clamping device for flanged parts, the clamping device includes a pressure pump 1, a vacuum pump 2, a support material storage tank 3, a vacuum adsorption base 5, a CNC platform 4, a plastic film 8, a support platform 9, a support material, a rotary joint, a heating module, a sealing plug, a temperature sensor module, and a force sensor module; wherein,

[0043] The vacuum adsorption base 5 is fixed on the CNC platform 4 by using the pressure difference formed by the vacuum pump 2 to remove the air inside the vacuum adsorption base 5, and the support platform 9 is adsorbed on the upper surface of the vacuum adsorption base 5. The vacuum adsorption base 5 is divided into two parts for control, one part is used to fix the support platform, and the other part is used to fix the parts to be processed.

[0044] Specifically, if Figure 2 The shape of the support platform 9 is designed according to the shape of the part to be processed 11 to achieve equal stress clamping. The support platform 9 is provided with a through hole along the axial direction, and the through hole serves as a vacuum adsorption channel for vacuum adsorption of the part to be processed 11; the side of the support platform 9 has a radial through hole, which is used to support the overflow of the inner cavity gas formed by the support platform 9 and the plastic film 8 when the support material is filled; the first sealing plug 7, the second sealing plug 13, the third sealing plug 14 and the fourth sealing plug are used to block the radial through holes on the side of the support platform 9 when completing the addition of the support material, so as to avoid the oxidation of the multi-walled carbon nanotubes by oxygen during the post-processing process of the part to be processed 11. Furthermore, the first sealing plug 7, the second sealing plug 13, the third sealing plug 14 and the fourth sealing plug are all truncated cone-shaped, so that they can achieve a good sealing effect; wherein, the position of the sealing plug should be higher than the scale line of the rotating head.

[0045] like Figure 2 The heating module is divided into a strip heating module 17 and an annular heating module 18, both of which are composed of several coils. The coils are used to heat the supporting material to further achieve stress relief treatment of the parts to be processed and disassembly of the parts; the strip heating module 17 is installed on the inner side wall of the support platform, and the annular heating module 18 is installed in a ring shape on the inner bottom surface of the support platform; the coil is a single body and can be controlled to switch independently to achieve precise control of the heating area. Furthermore, the switch of the coil is controlled by the comprehensive feedback of the temperature sensing module and the force sensing module to achieve low-stress clamping of the parts to be processed 11.

[0046] like Figure 2 and Figure 3The temperature sensing module includes a first temperature sensing patch group 19, a second temperature sensing patch group 20 and a third temperature sensing patch group 21; the third temperature sensing patch group 21 attached to the back of the part to be processed 11, the first temperature sensing patch group 19 and the second temperature sensing patch group 20 on the inner bottom and inner side of the support platform can be used to detect the temperature distribution law when the support material is poured into the support platform 9, the temperature distribution during stress relief post-treatment and processing. The first temperature sensing patch group 19 and the third temperature sensing patch group 21 are arranged according to the leaf sequence law and the distance between two adjacent temperature sensing patches is 5mm. In this way, the internal temperature law can be accurately and detailedly understood using the least number of temperature sensing patches.

[0047] like Figure 2 and Figure 3 The force sensing module includes a first force sensing patch group 16 and a second force sensing patch group 22. The first force sensing patch group 16 is attached to the support platform 9 and matches the flange of the part to be processed 11. The second force sensing patch group 22 is attached to the back of the part to be processed 11. It can be used to detect and monitor the stress distribution during clamping and processing. Furthermore, the force sensing patch is embedded in the gap between the temperature sensing patches.

[0048] like Figure 5 One side of the plastic film 8 has a heat-resistant adhesive that does not react with the part to be processed 11, which is used to perfectly fit the plastic film 8 to the lower surface of the part to be processed 11 and avoid direct contact between the supporting material and the part to be processed 11; and the other side surface of the plastic film 8 has many protrusions, which are used to improve the bonding force between the plastic film 8 and the supporting material, and further improve the stability of the support for the part to be processed 11 during the processing process.

[0049] The supporting material is a low-melting-point phase change material. The preferred low-melting-point phase change material of the present invention is paraffin wax with a melting point of 35°C and added with 0.6% (wt) multi-walled carbon nanotubes. The modified paraffin wax has the advantages of good fluidity and high thermal conductivity (45% higher than that of unmodified paraffin wax).

[0050] like Figure 1 One end of the first rotary joint 6, the second rotary joint 10, the third rotary joint 12 and the fourth rotary joint 15 is connected to the connection hole of the outer wall of the support platform 9, and the other end is connected to the pressure pump 1, and the other end of the pressure pump 1 is connected to the support material storage tank 3. The first rotary joint 6, the second rotary joint 10, the third rotary joint 12 and the fourth rotary joint 15 realize the switching of the inflow / outflow of the support material by rotating 180 degrees; further, the first rotary joint 6, the second rotary joint 10, the third rotary joint 12 and the fourth rotary joint 15 are all transparent, which is convenient for observing the height of the support material inside the support platform.

[0051] A flexible low-stress clamping method for flanged parts, the steps of which are as follows:

[0052] S1: Place the vacuum adsorption substrate on the CNC platform, and place the support platform 9 on the vacuum adsorption substrate 5, turn on the vacuum pump 2 to vacuum and fix it;

[0053] S2: Paste the force sensing patch on the back of the workpiece 11 to be processed in leaf order;

[0054] S3: Paste the temperature sensor patch on the inner surface of the support platform 9 and the back of the workpiece to be processed 11 according to the leaf sequence;

[0055] S4: Paste the plastic film 8 on the back of the part to be processed 11;

[0056] S5: Place the workpiece 11 on the support platform 9, and make the lower surface of the flange of the workpiece 11 contact the concave platform on the upper surface of the support platform 9, and turn on the vacuum pump 2 to draw vacuum to fix it;

[0057] S6: Turn on the pressure pump 1 to inject the liquid support material into the support platform 9 through the first rotary joint 6, the second rotary joint 10, the third rotary joint 12, and the fourth rotary joint 15. Adjust the speed of the four rotary joints injecting the support material and the switch of the coil in the heating module according to the temperature and stress sensing patch on the part 11 and the support platform 9;

[0058] S7: When the liquid level of the supporting material coincides with the notch on the first rotary joint 6, the injection of the supporting material is stopped;

[0059] S8: According to the stress distribution on the surface of the part 11 to be processed during the solidification of the support material, the switch of the heating coil is adjusted to achieve low-stress clamping of the part 11 to be processed;

[0060] S9: Turn off the heating module and insert the first sealing plug 7, the second sealing plug 13 and the third sealing plug 14 into the radial through holes on the side of the support platform;

[0061] S10: After the part processing is completed, turn on the heating module and heat it to 55-65°C for 25-50 minutes, keep it warm for 15-30 minutes, cool it down to 15°C for 1-1.5 hours, and keep it warm for 25-50 minutes. Repeat the above heating and cooling steps 2-5 times to achieve the purpose of stress relief;

[0062] In this embodiment, the specific parameters are as follows:

[0063] S10: After the parts are processed, turn on the heating module and heat it to 60°C for 25 minutes, keep it warm for 20 minutes, cool it down to 15°C for 1 hour, keep it warm for 25 minutes, and repeat the above heating and cooling steps 3 times;

[0064] S11: Turn on the heating module for 25 minutes to heat up until the supporting material melts, open the vacuum adsorption base 5, and remove the part to be processed 11.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clamping method for a low-stress flexible clamping device with a flanged part, characterized in that: The device includes a vacuum adsorption base, a support platform, a CNC platform, a plastic film, a support material, a rotary joint, a heating module, a temperature sensing module, a force sensing module, a pressure pump, a vacuum pump and a support material storage tank; wherein, the vacuum adsorption base is connected to the vacuum pump, the support platform is installed inside the vacuum adsorption base, and the vacuum adsorption base is fixed on the CNC platform by vacuuming. The vacuum adsorption base is used to fix the support platform and the part to be processed. The output end of the support material storage tank is connected to the connection port of the outer wall of the support platform through the pressure pump and the rotary joint. The rotary joint realizes the switching of the inflow / outflow of the support material by adjusting the rotation angle. The heating module is used to heat the support material to achieve stress relief treatment of the part to be processed and disassembly of the part. The plastic film is used to prevent direct contact between the support material and the part to be processed. The temperature sensing module is used to monitor the temperature of the support material. The force sensing module is used to monitor the stress distribution of the support material during clamping and processing of the part to be processed. The output of the heating coil is adjusted based on the monitoring values ​​of the temperature sensing module and the force sensing module. The specific clamping method includes the following steps: S1: Place the vacuum adsorption substrate on the CNC platform, and place the support platform on the vacuum adsorption substrate, turn on the vacuum pump to vacuum and fix it; S2: Paste the force sensing patch on the back of the part to be processed in leaf order; S3: Paste the temperature sensor patches on the inner surface of the support platform and the back of the workpiece to be processed in leaf order; S4: Paste the plastic film on the back of the part to be processed; S5: placing the part to be processed on the support platform, and making the lower surface of the flange of the part to be processed contact the concave platform on the upper surface of the support platform, turning on the vacuum pump to draw vacuum to fix it; S6: Turn on the pressure pump to inject the liquid support material into the support platform through the rotary joint. Adjust the speed of the rotary joint injecting the support material and the switch of the coil in the heating module according to the temperature of the part and the support platform and the stress sensing patch. S7: When the liquid level of the supporting material coincides with the notch on the rotary joint, the injection of the supporting material is stopped; S8: According to the stress distribution on the surface of the part to be processed during the curing process of the support material, the switch of the heating coil is adjusted to achieve low-stress clamping of the part to be processed; S9: Turn off the heating module and insert the sealing plug into the radial through hole on the side of the support platform; S10: After the parts are processed, the heating module is turned on to heat up, keep warm, cool down, and keep warm for multiple cycles to achieve the goal of stress relief; S11: Turn on the heating module to heat up until the support material melts, open the vacuum suction cup, and remove the parts to be processed.

2. The clamping method according to claim 1, characterized in that: The shape of the support platform is designed according to the shape of the part to be processed to achieve equal stress clamping. The support platform is provided with a through hole along the axial direction, and the through hole serves as a vacuum adsorption channel for vacuum adsorption of the part to be processed; the side of the support platform is provided with a radial through hole, which is used to allow the overflow of the inner cavity gas formed by the support platform and the plastic film when the support material is filled; the sealing plug is used to block the radial through hole on the side of the support platform when the support material is added, so as to prevent the oxidation of the multi-walled carbon nanotubes by oxygen during the post-processing of the part to be processed.

3. The clamping method according to claim 2, characterized in that: The sealing plug is in the shape of a truncated cone.

4. The clamping method according to claim 1, characterized in that: The heating module is composed of several coils, including a strip heating module and a ring heating module. The strip heating module is installed on the inner side wall of the support platform, and the ring heating module is installed in a ring shape on the inner bottom surface of the support platform. The coil is a single body and can be controlled to switch independently to achieve precise control of the heating area. The switch of the coil is controlled by the comprehensive feedback of the temperature sensor patch and the force sensor patch to achieve low-stress clamping of the parts to be processed.

5. The clamping method according to claim 1, characterized in that: The temperature sensing module includes a first temperature sensing patch group, a second temperature sensing patch group and a third temperature sensing patch group; the first temperature sensing patch group is attached to the back of the part to be processed, and the first temperature sensing patch group and the second temperature sensing patch group are respectively attached to the inner bottom surface and the inner side surface of the support platform. The first temperature sensing patch group, the second temperature sensing patch group and the third temperature sensing patch group are used to realize the temperature distribution law of the support material poured into the support platform, the stress relief post-processing and the temperature distribution detection during the processing process. The first temperature sensing patch group and the third temperature sensing patch group are arranged according to the leaf sequence law and the distance between two adjacent temperature sensing patches is a preset value.

6. The clamping method according to claim 1, characterized in that: The force sensing module includes a first force sensing patch group and a second force sensing patch group. The first force sensing patch group is arranged on the support platform and cooperates with the flange of the part to be processed. The second force sensing patch group is attached to the back of the part to be processed and is used to detect and monitor the stress distribution during clamping and processing. The force sensing patch is embedded in the gap between the temperature sensing patches.

7. The clamping method according to claim 1, characterized in that: One side of the plastic film has a heat-resistant adhesive that does not react with the part to be processed, which is used to perfectly fit the plastic film to the lower surface of the part to be processed. The other side of the plastic film has a plurality of protrusions.

8. The clamping method according to claim 1, characterized in that: The supporting material is a low melting point phase change material, including paraffin wax added with multi-walled carbon nanotubes.

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