Thin-wall cylindrical part machining shape maintaining device and method

Abstract

The invention relates to a thin-walled cylindrical part machining shape maintaining device and method, which are used for solving the technical problem of poor machining precision caused by the condition that a thin-walled cylindrical part is easy to deform during machining in the prior art, and the device comprises a bottom plate, a holding ring and an inner ring pressing plate, the bottom plate is fixedly arranged on a machine tool workbench; the embracing ring is arranged on the bottom plate, and the embracing ring conducts shape maintaining and embracing on the thin-wall cylindrical part from the periphery of the part. The inner ring pressing plate is arranged on the bottom plate and abuts against the inner wall of the bottom of the part. The embracing ring and the inner ring pressing plate provide support, so that the deformation resistance of the part is enhanced, the generated elastic deformation amount is reduced under the action of the same cutting force, and the contact damping of the part is increased through large-area contact between the embracing ring and the outer wall of the part and contact between the inner ring pressing plate and the inner wall of the part; the damping can effectively dissipate vibration energy and prevent vibration from being amplified, so that deformation of the part in the machining process can be reduced, and the forming quality of the part is improved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a shaping device and method for machining thin-walled cylindrical parts. Background Technology

[0002] Thin-walled cylindrical parts, due to their extremely small wall thickness-to-diameter ratio, exhibit uneven elastic recovery after unloading during turning, resulting in initial deformations such as ellipticity and warping. Upon transfer to a milling machine, traditional three-jaw or clamping plate fixtures only provide point-to-line contact, inducing radial and axial clamping deformation again upon re-clamping. The cutting force direction constantly changes during the milling cutter's movement within the cavity, and the part's low rigidity and weak damping easily induce chatter, leading to tool deflection and chatter marks, simultaneously deteriorating dimensional accuracy and surface quality. Current processes lack a systematic shape-fixing solution throughout the entire process, relying on empirical, repeated clamping and repositioning, resulting in low efficiency and poor consistency. This contributes to the problem of easy deformation of thin-walled cylindrical parts at various stages of machining. Summary of the Invention

[0003] The purpose of this invention is to provide a shaping device for processing thin-walled cylindrical parts, so as to solve the technical problem of poor processing accuracy caused by the easy deformation of thin-walled cylindrical parts during processing in the prior art.

[0004] The objective of this invention is mainly achieved through the following technical solutions:

[0005] In a first aspect, a shaping device for processing thin-walled cylindrical parts is provided, including a base plate, a retaining ring, and an inner ring pressure plate;

[0006] The base plate is fixedly mounted on the machine tool worktable; the clamping ring is mounted on the base plate, and the clamping ring clamps the thin-walled cylindrical part from the outer periphery of the part; the inner ring pressure plate is mounted on the base plate and abuts against the bottom inner wall of the thin-walled cylindrical part.

[0007] Furthermore, the clamping ring includes multiple clamping ring units, which clamp the thin-walled cylindrical part in a shaped manner from the outer periphery of the part.

[0008] Furthermore, the ring unit includes a unit body, a shaped surface, and a weight-reducing groove. The shaped surface is located on the unit body and abuts against the thin-walled cylindrical part. The weight-reducing groove is formed on the shaped surface to reduce the weight of the shaped surface.

[0009] Furthermore, the retaining ring unit also includes a flange, which is disposed on the side wall of the unit body to connect with the adjacent retaining ring unit.

[0010] Furthermore, the retaining ring also includes a gasket assembly, which includes a mounting groove and a flexible gasket. The mounting groove is formed on the inner wall of the retaining ring, and the flexible gasket is embedded in the mounting groove and abuts against the thin-walled cylindrical part.

[0011] Furthermore, the base plate is provided with U-shaped or T-shaped grooves to mate with the T-shaped grooves of the machine tool worktable.

[0012] Furthermore, the base plate is also provided with a positioning stop to cooperate with the retaining ring to achieve radial positioning.

[0013] Furthermore, a lifting ring is fixedly installed on the base plate to suspend the forming device for processing thin-walled cylindrical parts.

[0014] In a second aspect, a method for shaping thin-walled cylindrical parts is provided, utilizing the shaping apparatus for thin-walled cylindrical parts described in the first aspect, the method comprising:

[0015] S1, Fix the base plate on the machine tool worktable;

[0016] S2, Place the retaining ring on the base plate so that the retaining ring can hug the thin-walled cylindrical part from the outer periphery of the part;

[0017] S3, Set the inner ring pressure plate on the base plate and abut against the bottom inner wall of the part;

[0018] S4. Adjust the fixing and clamping force of the clamping ring and inner ring pressure plate, and carry out processing after the parts are clamped.

[0019] Furthermore, in S2, each clamping ring unit clamps the thin-walled cylindrical part from different positions on the outer periphery of the part, and the overall clamping is achieved by connecting each clamping ring unit.

[0020] Furthermore, S2 includes:

[0021] S2.1 Place the unit body of each ring unit in the corresponding position on the base plate;

[0022] S2.2, connect adjacent ring units using the flange lugs on the side wall of the unit body;

[0023] S2.3 Adjust the contact degree between the shaped surface of each ring unit and the outer periphery of the thin-walled cylindrical part, so that the shaped surface is in close contact with the thin-walled cylindrical part.

[0024] In one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0025] (1) In the technical solution of the thin-walled cylindrical part processing shaping device of the present invention, the retaining ring and the inner ring pressure plate provide support, which enhances the part's ability to resist deformation. Under the same cutting force, the amount of elastic deformation generated will be reduced. The large-area contact between the retaining ring and the outer wall of the part, as well as the contact between the inner ring pressure plate and the inner wall of the part, increase the contact damping of the part. This damping can effectively dissipate vibration energy and prevent the amplification of vibration. Thus, the deformation of the part during the processing can be reduced, and the forming quality of the part can be improved.

[0026] (2) In the technical solution of the thin-walled cylindrical part processing shaping device of the present invention, the shaping surface is designed according to the shape of the part and can be precisely fitted with the thin-walled cylindrical part to directly and stably shape the part. At the same time, the reduction groove improves the stress distribution of the shaping surface, making the force on the shaping surface more uniform when it holds the part, reducing the deformation of the part caused by uneven stress, thereby improving the processing accuracy of the part.

[0027] (3) In the technical solution of the thin-walled cylindrical part processing shaping device of the present invention, the flexible pad is embedded in the mounting groove of the inner wall of the clamping ring and abuts against the part. Its flexibility allows it to adapt to the deformation according to the surface shape of the part. When the clamping ring applies pressure to the part, the flexible pad can evenly distribute the pressure on the contact surface to avoid excessive local pressure. The flexible pad provides uniform and stable support for the part, enhances the part's ability to resist deformation, and thus reduces the amount of "tool deflection".

[0028] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0029] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0030] Figure 1 This is a schematic diagram of the structure of the shaping device for processing thin-walled cylindrical parts in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the ring-shaped unit in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the gasket assembly in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the internal cavity shaped component in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the supporting hub structure in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the inflatable bladder in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the reset component in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the first support plate and the second support plate in an embodiment of the present invention;

[0038] Figure 9 This is a flowchart of the shaping method for thin-walled cylindrical parts in an embodiment of the present invention.

[0039] The attached figures are labeled as follows:

[0040] 1-Base plate, 2-Holding ring, 21-Holding ring unit, 210-Unit body, 211-Shaped surface, 212-Lightening groove, 213-Flange lug, 22-Gasket assembly, 221-Mounting groove, 222-Flexible gasket, 3-Inner ring pressure plate, 4-Lifting ring, 5-Inner cavity shaping assembly, 51-Fluid distribution cavity, 52-Distribution pipe, 53-Support hub, 531-Support groove, 532-Fixing hole, 54-Expansion bladder, 541-Expansion bladder unit, 542-Fixing base, 543-Side wall, 544-Telescopic surface, 545-Reset assembly, 546-First support plate, 547-Second support plate. Detailed Implementation

[0041] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0042] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0043] Example 1

[0044] like Figure 1 As shown, Embodiment 1 of the present invention provides a shaping device for processing thin-walled cylindrical parts, including a base plate 1, a clamping ring 2 and an inner ring pressure plate 3; the base plate 1 is fixedly mounted on the machine tool worktable; the clamping ring 2 is mounted on the base plate 1, and the clamping ring 2 clamps the thin-walled cylindrical part from the outer periphery of the part; the inner ring pressure plate 3 is mounted on the base plate 1 and abuts against the bottom inner wall of the part.

[0045] The base plate 1 is used to provide a stable and reliable mounting platform. By rigidly connecting with the machine tool table, the base plate 1 and the machine tool form an integral whole, which can effectively absorb and resist various dynamic loads generated during the machining process. This not only ensures the accuracy of the current machining operation, but also provides convenience for subsequent repetitive production, so that a consistent reference position can be obtained for each clamping, thereby ensuring the consistency of batch parts machining.

[0046] The clamping ring 2 is used to achieve radial constraint on thin-walled cylindrical parts. It clamps the thin-walled cylindrical parts from the outer circumference, thereby providing a uniform and continuous radial support force to the parts, thus improving the radial rigidity of the parts during the machining process. The clamping ring 2 distributes the clamping force to the entire circumference through a large-area contact with the outer surface of the parts, avoiding the local stress concentration problem caused by point contact or line contact fixtures such as traditional three-jaw chucks. This uniform constraint force can effectively suppress the radial vibration and deformation of the parts under the action of cutting force.

[0047] The inner ring pressure plate 3 provides axial clamping force and radial support to the bottom inner wall of the part. It cooperates with the radial constraint of the clamping ring. Through the precise cooperation with the bottom inner wall of the part, the inner ring pressure plate 3 achieves axial positioning and inner support of the part.

[0048] In the machining process, thin-walled cylindrical parts, due to insufficient workpiece rigidity, undergo elastic deformation under the action of cutting force, resulting in the actual cutting depth of the tool being less than the theoretical value, thereby affecting the machining dimensional accuracy (this phenomenon is referred to as "tool deflection" in the art). In the technical solution of this embodiment, the retaining ring 2 and the inner ring pressure plate 3 provide support, which enhances the part's ability to resist deformation. Under the same cutting force, the amount of elastic deformation (i.e., the amount of "tool deflection") generated will be reduced.

[0049] In addition, due to the structural characteristics of thin-walled cylindrical parts, self-excited vibrations (a phenomenon known in the art as "chatter") will occur between the tool and the workpiece during the machining process. Chatter will affect the surface quality of the machined parts and may cause damage to the tool and machine tool. The large-area contact between the retainer and the outer wall of the part, as well as the contact between the inner ring pressure plate and the inner wall of the part, increase the contact damping of the part. This damping can effectively dissipate vibration energy and prevent the vibration from amplifying. At the same time, by increasing the rigidity of the part, its natural frequency is increased, making it less likely for the excitation frequency of the machining process to coincide with the natural frequency of the part, thereby reducing the occurrence of chatter.

[0050] In summary, based on the above settings, this embodiment can reduce the deformation of parts during processing and improve the forming quality of parts.

[0051] For example, the thin-walled cylindrical part can be a cylindrical part with a circular, elliptical or square cross-section; the machining can be milling, turning, but is not limited to these.

[0052] In one specific implementation, such as Figure 1 As shown, the clamping ring 2 includes multiple clamping ring units 21, which clamp the thin-walled cylindrical part from the outer periphery of the part in a shaped clamping manner.

[0053] In processing practice, there are often cylindrical structures with irregular shapes. Compared with a single integral clamping method, multiple clamping units 21 can more flexibly adjust the clamping range and force on the parts. For some thin-walled cylindrical parts with irregular shapes or special structural requirements, effective shape-maintaining clamping can also be achieved, improving the versatility of the device.

[0054] By working together, the clamping force on the outer periphery of the part can be distributed to each unit, which can avoid excessive local deformation of the part due to excessive local force, and make the clamping force on the part more uniform during the processing, thereby better maintaining the overall shape accuracy of the part.

[0055] In one specific implementation, such as Figure 2 As shown, the ring-shaped unit 21 includes a unit body 210, a three-dimensional surface 211, and a weight-reducing groove 212. The three-dimensional surface 211 is located on the unit body 210 and abuts against the thin-walled cylindrical part. The weight-reducing groove 212 is formed on the three-dimensional surface 211 to reduce the weight of the three-dimensional surface 211.

[0056] The unit body 210 provides a foundation for mounting and supporting other components such as the three-dimensional surface 211 and the light-reducing groove 212. Simultaneously, the unit body 210 connects and positions with other components such as the retaining ring unit 21 and the base plate 1. The three-dimensional surface 211 applies pressure through close contact with the outer periphery of the part, limiting the radial and axial deformation of the part and thus maintaining its shape accuracy. It should be noted that, to accommodate thin-walled cylindrical parts of different shapes, the shape of the three-dimensional surface 211 needs to be specially designed according to the part's shape to ensure proper fit. Maximizing the contact area of ​​the parts improves the stability and reliability of the ring. The relief groove 212 is opened on the ring surface 211 to reduce the weight of the ring surface 211. The setting of the relief groove 212 can also improve the stress distribution of the ring surface 211. When clamping thin-walled cylindrical parts, the ring surface 211 will be subjected to a certain stress. The relief groove 212 can make the stress more evenly distributed on the ring surface 211, avoid local stress concentration, thereby reducing the possibility of damage to the ring surface 211 due to excessive stress and extending the service life of the ring unit 21.

[0057] The shaping surface 211 is designed according to the shape of the part, and can precisely fit with the thin-walled cylindrical part, directly stabilizing the part. At the same time, the weight reduction groove 212 improves the stress distribution of the shaping surface 211, making the force on the shaping surface 211 more uniform when clamping the part, reducing the deformation of the part caused by uneven stress, thereby improving the machining accuracy of the part and ensuring that the size and shape of the machined part better meet the design requirements. After reducing the weight of the clamping ring unit 21, the inertia of the device during operation is reduced, and the vibration is also reduced accordingly, improving the shaping accuracy and ensuring the stability of the machining quality.

[0058] In one specific implementation, such as Figure 2 As shown, the retaining ring unit 21 also includes a flange lug 213, which is disposed on the side wall of the unit body 210 to connect with the adjacent retaining ring unit 21.

[0059] The flange lug 213 is a structure that connects adjacent retaining ring units 21. Multiple retaining ring units 21 flange lugs 213 are connected together by bolts and other connectors to form a complete retaining ring 2, thereby achieving overall shaping of thin-walled cylindrical parts.

[0060] In one specific implementation, such as Figure 3 As shown, the retaining ring 2 also includes a gasket assembly 22, which includes a mounting groove 221 and a flexible gasket 222. The mounting groove 221 is formed on the inner wall of the retaining ring 2, and the flexible gasket 222 is embedded in the mounting groove 221 and abuts against the thin-walled cylindrical part.

[0061] The mounting groove 221 is used to accommodate and fix the flexible gasket 222, and its opening direction is facing the outer wall of the thin-walled cylindrical part. The flexible gasket 222 is used to provide a buffering and shock absorption function. The flexible gasket 222 is usually made of a material with a certain elasticity, such as rubber or silicone. The flexible gasket 222 can absorb and disperse the pressure applied to the part by the clamping ring 2 through its own elastic deformation, so as to play a buffering and shock absorption role. This helps to reduce the damage to the thin-walled cylindrical part caused by excessive clamping force or vibration generated during processing, and protect the surface quality of the part.

[0062] In addition, thin-walled cylindrical parts may have certain shape errors or uneven surfaces during the manufacturing process. The flexibility of the flexible gasket 222 allows it to better adapt to the shape changes of the parts, fit tightly against the surface of the parts, increase the contact area, and improve the stability and reliability of the shape.

[0063] The flexible pad 222 is embedded in the mounting groove 221 on the inner wall of the retaining ring 2 and abuts against the part. Its flexibility allows the flexible pad 222 to adapt to the shape of the part surface. When the retaining ring 2 applies pressure to the part, the flexible pad 222 can evenly distribute the pressure on the contact surface to avoid excessive local pressure. For example, if there are small bumps on the surface of the part, the flexible pad 222 can be appropriately compressed at the protrusions and fully contacted at the depressions to provide uniform and stable support for the part, enhance the part's ability to resist deformation, and thus reduce the amount of "tool deflection".

[0064] The retaining ring 2 has a large contact area with the outer wall of the part, and the inner ring pressure plate 3 has a contact area with the inner wall of the part. The flexible gasket 222 further increases the tightness and complexity of this contact. The friction between the flexible gasket 222 and the surface of the part, as well as its own elastic deformation, can increase the contact damping. When vibration occurs, the contact damping can convert the vibration energy into heat energy and other forms of energy to dissipate, prevent the amplification of vibration, and thus suppress the generation and development of flutter.

[0065] In one specific embodiment, the base plate 1 is provided with a U-shaped or T-shaped groove to cooperate with the T-shaped groove of the machine tool worktable.

[0066] By engaging the U-shaped or T-shaped groove on the base plate 1 with the T-shaped groove on the machine tool worktable, the base plate 1 can be precisely positioned on the machine tool worktable.

[0067] In one specific embodiment, the base plate 1 is also provided with a positioning stop to cooperate with the retaining ring 2 to achieve radial positioning.

[0068] In one specific implementation, such as Figure 1 As shown, a lifting ring 4 is also fixedly installed on the base plate 1 and / or the clamping ring 2 to lift the thin-walled cylindrical parts processing shaping device.

[0069] The lifting ring 4 is a component used for hoisting. It is fixed to the base plate 1 and / or the clamping ring 2, providing a clear point of force for the lifting equipment (such as overhead cranes, hoists, etc.). Through the lifting ring 4, the lifting equipment can easily attach wire ropes or hooks to realize the hoisting and movement of the entire thin-walled cylindrical part processing shaping device.

[0070] Example 2

[0071] Embodiment 2 of the present invention is a further improvement based on Embodiment 1. The forming device for processing thin-walled cylindrical parts further includes an inner cavity forming component 5, such as... Figure 4As shown, the inner cavity shaping assembly 5 includes: a fluid actuator, a fluid distribution chamber 51, a distribution pipe 52, a support hub 53, and an expansion bladder 54. The fluid distribution chamber 51 is connected to the fluid actuator to obtain fluid. The distribution pipe 52 is connected between the fluid distribution chamber 51 and the expansion bladder 54 to deliver fluid to the expansion bladder 54 to compress the inner wall of the thin-walled cylindrical part. The support hub 53 is sleeved on the distribution pipe 52 and wraps around a portion of the expansion bladder 54 to support the expansion bladder 54.

[0072] The fluid actuator is the power source for the entire internal cavity shaping assembly 5. Under the control of the control system (such as using a PLC or microcontroller), it can generate sufficient pressure to drive the flow of fluid (such as hydraulic oil, gas, etc.) to provide the energy required for the expansion of the expansion bladder. By adjusting the output pressure and flow rate of the fluid actuator, the degree and speed of expansion of the expansion bladder can be precisely controlled, thereby achieving precise adjustment of the extrusion pressure on the inner wall of the thin-walled cylindrical part.

[0073] The fluid distribution chamber 51 serves as the connection hub between the fluid actuator and the distribution pipe 52, and plays the role of collecting and distributing fluid. It collects the fluid output by the fluid actuator and then distributes it evenly to the expansion bladder 54 through multiple distribution pipes 52, ensuring that each expansion bladder 54 can obtain sufficient fluid and achieve synchronous expansion of expansion bladders 54 at different positions.

[0074] The distribution pipe 52 is connected between the fluid distribution chamber 51 and the expansion bladder 54, and is responsible for delivering fluid from the fluid distribution chamber 51 to the expansion bladder 54.

[0075] The support hub 53 is sleeved on the distribution pipe 52 and wraps around part of the expansion bladder 54, providing structural support for the expansion bladder 54. In addition, the support hub 53 can also play a positioning and guiding role, ensuring that the expansion bladder 54 expands in the correct direction and position during the expansion process.

[0076] The expansion bladder 54 is the part of the inner cavity shaping assembly 5 that directly contacts the inner wall of the thin-walled cylindrical part. When the fluid enters the expansion bladder 54 through the distribution pipe 52, the expansion bladder 54 will expand and squeeze the inner wall of the thin-walled cylindrical part, thereby enhancing the rigidity of the part, reducing the elastic deformation ("tool deflection") caused by insufficient rigidity under the action of cutting force, and ensuring the machining dimensional accuracy of the part.

[0077] In summary, by combining the fluid actuator, fluid distribution chamber 51, distribution pipe 52, support hub 53, and expansion bladder 54, the rigidity of the part is enhanced. Through the compression of the inner wall of the thin-walled cylindrical part by the expansion bladder 54, the inner cavity shaping component 5 effectively enhances the rigidity of the part. During the cutting process, the part can better resist the cutting force, reducing dimensional errors and shape deviations caused by elastic deformation, thereby improving the machining accuracy and surface quality of the part. The extrusion pressure is made more uniform. The reasonable design of the fluid distribution chamber and distribution pipe ensures that each expansion bladder receives a uniform fluid supply, thereby applying uniform extrusion pressure to the inner wall of the thin-walled cylindrical part. This can avoid deformation of the part caused by uneven local stress, further improving the machining accuracy.

[0078] As a specific implementation method, such as Figure 5 As shown, the support hub 53 includes a support groove 531 and a fixing hole 532 formed in the support groove 531. The distribution pipe 52 passes through the fixing hole 532 and communicates with the expansion bladder 54. The support groove 531 wraps around part of the expansion bladder 54 to support the expansion bladder 54.

[0079] The support groove 531 is used to accommodate and position the expansion bladder 54, provide a support structure and guide the expansion direction; for example, the cross-section of the support groove 531 may be semi-circular; the fixing hole 532 is used to fix the distribution pipe 52, the distribution pipe 52 passes through the fixing hole 532, so that the distribution pipe 52 can be stably installed on the support hub 53, thereby ensuring that the distribution pipe 52 will not be displaced or shaken during the fluid transportation process, and ensuring that the fluid can be accurately and stably transported from the fluid distribution chamber 51 to the expansion bladder 54.

[0080] As a specific implementation, the inner cavity shaping assembly 5 also includes a solenoid valve, which is disposed on the distribution pipe 52 to control the flow rate of the fluid.

[0081] Solenoid valves control the opening of the valve core through electromagnetic force, thereby precisely regulating the fluid flow rate through the distribution pipe. In the machining process of thin-walled cylindrical parts, different machining stages (such as roughing and finishing) and different part characteristics (such as wall thickness and material) have different requirements for the internal cavity shaping force. Solenoid valves can quickly and accurately adjust the fluid flow rate according to preset programs or real-time feedback signals, thereby changing the shaping force applied to the internal cavity of the part by the internal cavity shaping component.

[0082] As a specific implementation method, such as Figure 6As shown, the expansion bladder 54 includes several expansion bladder units 541. Each expansion bladder unit 541 includes a fixed base 542, a side wall 543, and a telescopic surface 544. The side wall 543 is embedded on both sides of the fixed base 542 and the two are sealed. The telescopic surface 544 is fixed on the fixed base 542 and the side wall 543 and the telescopic surface 544 is sealed with both the fixed base 542 and the side wall 543. The fixed base 542 is fixed on the support hub 53.

[0083] The fixed base 542 supports the side wall 543 and the telescopic surface 544, and also plays a positioning role when the expansion bladder unit 541 is installed on the support hub or other structures. The side wall 543 is embedded on both sides of the fixed base 542, and together with the fixed base 542 and the telescopic surface 544, it forms a relatively closed independent space. After the fluid enters the expansion bladder unit 541, the side wall 543 can restrict the expansion direction of the expansion bladder unit 541, causing it to expand mainly in the direction of the telescopic surface 544, thereby more effectively applying extrusion pressure to the inner wall of the thin-walled cylindrical part. The telescopic surface 544 is the direct... When fluid enters the expansion bladder unit 541, the expansion surface 544 in contact with the inner wall of the thin-walled cylindrical part will expand and deform under the action of fluid pressure, thereby applying uniform extrusion force to the inner wall of the part, enhancing the rigidity of the part, and reducing workpiece deformation during processing. For example, the expansion surface 544 can be made of silicone rubber or thermoplastic elastomer (TPE). Multiple expansion bladder units 541 work together. Through the cooperation of the fixed base 542, side wall 543 and expansion surface 544, the fluid can be targeted to the expansion bladder unit 541 to compress and shape the part at the position where it needs to be shaped.

[0084] As a specific implementation method, such as Figure 7 As shown, the expansion bladder unit 541 also includes a reset assembly 545, which is connected between the telescopic surface 544 and the fixed base 542. The reset assembly 545 provides a preload force to position the telescopic surface 544 in a predetermined position when no fluid is injected.

[0085] The reset assembly 545 provides pre-tightening force through its own elastic deformation characteristics. When no fluid is injected into the expansion bladder unit 541, the reset assembly 545 is in a natural or pre-compressed state and applies a pulling or pushing force to the telescopic surface 544, pulling or pushing the telescopic surface 544 back to a predetermined position. This predetermined position is the designed initial position, ensuring that the expansion bladder unit 541 is in a stable contracted state when no fluid is applied, preparing for subsequent fluid injection and expansion. When fluid is injected into the expansion bladder unit 541, the fluid pressure overcomes the pre-tightening force of the reset assembly 545, causing the telescopic surface 544 to expand outward. When the fluid is discharged, the pre-tightening force of the reset assembly 545 causes the telescopic surface 544 to return to the predetermined position. For example, the reset assembly 545 can be a spring or elastic rubber element with equal spacing.

[0086] Based on this, such as Figure 8 As shown, the expansion bladder unit 541 also includes a first support plate 546 and a second support plate 547. The first support plate 546 is fixedly disposed on the side wall 543, and the second support plate 547 is fixedly disposed on the inner wall of the telescopic surface 544. The reset assembly 545 is disposed between the first support plate 546 and the second support plate 547.

[0087] The first support plate 546 is fixedly mounted on the side wall 543, providing a stable fixing point for the reset assembly 545. This ensures that one end of the reset assembly 545 is fixed, allowing the reset assembly 545 to accurately apply and transmit force during operation. The second support plate 547 is fixedly mounted on the inner wall of the telescopic surface 544. Its main function is to connect the reset assembly 545 and the telescopic surface 544. Through the second support plate 547, the preload generated by the reset assembly 545 is accurately transmitted to the telescopic surface 544, allowing the telescopic surface 544 to return to its predetermined position when no fluid is introduced. Simultaneously, when fluid is introduced, it also assists the telescopic surface 544 in returning to its predetermined position. 44. Smooth expansion. In summary, the reset assembly 545 can accurately apply preload, thereby precisely controlling the predetermined position of the telescopic surface 544 when no fluid is injected. During fluid injection and discharge, the reset assembly 545 achieves smooth force transmission with the telescopic surface 544 through the first support plate 546 and the second support plate 547. When fluid is injected, the telescopic surface 544 can expand outward evenly, avoiding local over-expansion or deformation. When fluid is discharged, the reset assembly 545 can make the telescopic surface 544 smoothly retract back to the predetermined position, reducing vibration and impact during the expansion process and improving the stability and reliability of the expansion bladder unit 541.

[0088] As a specific implementation, the inner cavity shaping component 5 also includes a lifting component, and the fluid distribution cavity 51 is disposed on the lifting component to realize lifting. The lifting component is connected to the fluid driver to obtain lifting power.

[0089] The lifting assembly is a component that enables the adjustment of the inner wall's shape height. It can move the fluid distribution chamber 51 to the corresponding position according to the specific conditions of the inner wall at different heights, so that the fluid distribution chamber 51 can drive the distribution pipe 52, support hub 53 and expansion bladder 54 to reach the various height points that need to be shaped, thus meeting the shape requirements of the inner wall at different heights.

[0090] Example 3

[0091] Embodiment 3 of the present invention is a further improvement on Embodiment 2, wherein a sensor for sensing the deformation of the inner wall of the part is integrated on the telescopic surface 544 of the expansion bladder unit 541.

[0092] The sensor is installed on the telescopic surface 544 and can sense the deformation of the telescopic surface 544 in real time, thereby reflecting the deformation of the inner wall of the part. By converting physical deformation into electrical signals or other measurable signals, the sensor can accurately measure information such as the amplitude, direction, and rate of inner wall deformation. The sensor feeds back the sensed inner wall deformation information to the control system. Based on this feedback information, the control system adjusts the expansion pressure, expansion speed, and other parameters of the expansion bladder unit 541 in real time to achieve precise control of the inner wall deformation. If the sensor detects that the deformation at a certain point on the inner wall exceeds the preset range, the control system adjusts the force of the expansion bladder unit 541 in time to restore the inner wall to the specified shape and size. During the shaping process, the deformation of the inner wall of the part may be affected by various factors, such as material inhomogeneity and thermal stress during processing. The sensor can sense these changes in time and feed the information back to the control system. The control system can quickly adjust the parameters of the expansion bladder unit 541 to achieve real-time dynamic control of the inner wall deformation and ensure that the shaping process is always in the optimal state.

[0093] Specifically, the sensor is a flexible piezoresistive pressure sensor or a flexible capacitive pressure sensor, and the sensor is embedded or attached in an array within the telescopic surface 544.

[0094] Alternatively, the sensor may be an eddy current displacement sensor or a miniature laser displacement sensor, which is embedded in a specific position on the telescopic surface 544 to directly measure the distance to the inner wall of the part.

[0095] The thin-walled cylindrical part forming device also includes a control system that receives signals from the sensors and adjusts the output of the fluid actuator in real time based on the signals to compensate for the pressure in the concave area.

[0096] Example 4

[0097] Embodiment 4 of the present invention provides a method for shaping thin-walled cylindrical parts, using the shaping device for thin-walled cylindrical parts described in Embodiments 1, 2, or 3, such as... Figure 9 As shown, the method includes:

[0098] S1, Fix the base plate on the machine tool worktable;

[0099] S2, Place the retaining ring on the base plate so that the retaining ring can hug the thin-walled cylindrical part from the outer periphery of the part;

[0100] S3, Set the inner ring pressure plate on the base plate and abut against the bottom inner wall of the part;

[0101] S4. Adjust the fixing and clamping force of the clamping ring and inner ring pressure plate, and carry out processing after the parts are clamped.

[0102] By using a base plate to provide a stable reference, a retaining ring to shape the outer periphery, an inner ring pressure plate to support the inner wall of the bottom, and precise adjustment of the clamping force, the method in this embodiment can effectively control the deformation of thin-walled cylindrical parts during processing, ensuring that the dimensions and shape of the parts in all directions remain within the required accuracy range.

[0103] In a specific implementation, in S2, each clamping ring unit clamps the thin-walled cylindrical part from different positions on the outer periphery of the part, and the overall clamping is achieved by connecting each clamping ring unit.

[0104] Thin-walled cylindrical parts are highly susceptible to deformation due to external forces during processing. Each clamping ring unit clamps the part from different positions on its outer periphery, which can evenly distribute the external forces that may be applied to the part to multiple parts. The clamping action of multiple clamping ring units at different positions can jointly resist this deformation, avoiding local deformation problems such as dents and bends caused by excessive local forces, thereby ensuring the overall shape accuracy of the part.

[0105] Specifically, S2 includes:

[0106] S2.1 Place the unit body of each ring unit in the corresponding position on the base plate;

[0107] S2.2, connect adjacent ring units using the flange lugs on the side wall of the unit body;

[0108] S2.3 Adjust the contact degree between the shaped surface of each ring unit and the outer periphery of the thin-walled cylindrical part, so that the shaped surface is in close contact with the thin-walled cylindrical part.

[0109] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A shaping device for processing thin-walled cylindrical parts, characterized in that, Includes a base plate (1), a retaining ring (2), and an inner ring pressure plate (3); The base plate (1) is fixedly mounted on the machine tool workbench; the clamping ring (2) is mounted on the base plate (1), and the clamping ring (2) clamps the thin-walled cylindrical part from the outer periphery of the part; the inner ring pressure plate (3) is mounted on the base plate (1) and abuts against the bottom inner wall of the thin-walled cylindrical part.

2. The shaping device for processing thin-walled cylindrical parts according to claim 1, characterized in that, The clamping ring (2) includes multiple clamping ring units (21), which clamp the thin-walled cylindrical part from the outer periphery of the part in a shaped clamping manner.

3. The shaping device for processing thin-walled cylindrical parts according to claim 2, characterized in that, The ring unit (21) includes a unit body (210) and a three-dimensional surface (211). The three-dimensional surface (211) is located on the unit body (210) and abuts against the thin-walled cylindrical part.

4. The shaping device for processing thin-walled cylindrical parts according to claim 3, characterized in that, The ring unit (21) also includes a flange (213), which is disposed on the side wall of the unit body (210) to connect with the adjacent ring unit (21).

5. The shaping device for processing thin-walled cylindrical parts according to claim 3, characterized in that, The ring unit (21) also includes a weight-reducing groove (212), which is formed on the dimensional surface (211) to reduce the weight of the dimensional surface (211).

6. The shaping device for processing thin-walled cylindrical parts according to claim 1, characterized in that, The retaining ring (2) also includes a gasket assembly (22), which is placed on the inner wall of the retaining ring (2).

7. The shaping device for processing thin-walled cylindrical parts according to claim 6, characterized in that, The gasket assembly (22) includes a mounting groove (221) and a flexible gasket (222). The mounting groove (221) is formed on the inner wall of the retaining ring (2). The flexible gasket (222) is embedded in the mounting groove (221) and abuts against the thin-walled cylindrical part.

8. The shaping device for processing thin-walled cylindrical parts according to claim 1, characterized in that, The base plate (1) is provided with a U-shaped or T-shaped groove to match the T-shaped groove of the machine tool worktable.

9. The shaping device for processing thin-walled cylindrical parts according to claim 1, characterized in that, The base plate (1) is also provided with a positioning stop to cooperate with the retaining ring (2) to achieve radial positioning.

10. The shaping device for processing thin-walled cylindrical parts according to claim 1, characterized in that, A lifting ring (4) is also fixedly installed on the base plate (1) to lift the thin-walled cylindrical part processing shaping device.

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