A processing device and method for C-type frame class asymmetric parts
By designing a C-shaped frame asymmetric part machining device that combines positioning clamping, floating clamping, and auxiliary clamping, the problems of machining deformation and versatility were solved, realizing efficient and low-cost machining of C-shaped frame parts, and ensuring machining accuracy and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- COMMERCIAL AIRCRAFT CORP OF CHINA LTD
- Filing Date
- 2026-05-15
- Publication Date
- 2026-06-26
AI Technical Summary
Existing technologies present challenges in deformation control when machining asymmetrical C-frame parts. Rigid, dedicated tooling has poor versatility and high cost, while modular clamping systems are difficult to position quickly and accurately and involve cumbersome flipping processes, resulting in low production efficiency.
A C-shaped frame asymmetric parts processing device was designed, which adopts a combination of positioning clamping, floating clamping, auxiliary clamping and fixed clamping. The device achieves rapid initial positioning and overall rigid support through symmetrically arranged connecting parts and abutment parts. Combined with layered alternating processing and aging treatment, deformation is reduced and versatility is improved.
It effectively suppresses warping and shrinkage deformation during processing, improves processing efficiency and versatility, reduces processing costs and manufacturing cycle, and ensures the precision and consistency of parts.
Smart Images
Figure CN122274693A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aerospace structural component processing technology, and in particular to a processing apparatus and method for C-shaped frame-type asymmetrical parts. Background Technology
[0002] In the aerospace manufacturing field, aircraft structural components are rapidly developing towards larger size, integration, and lightweight design. Emergency door C-frames, as typical critical load-bearing components, are characterized by a high aspect ratio, thin walls, weak stiffness, and asymmetrical cross-sections, classifying them as typical slender, weak-stiff structural components. Deformation control during processing is a core technical challenge affecting the manufacturing accuracy of such parts. Furthermore, the numerous part numbers in a multi-variety, small-batch production model create an urgent need for a versatile and rapid-response clamping system.
[0003] Currently, the machining and clamping of slender, low-rigidity, asymmetrical structural parts mainly employs two methods: rigid dedicated tooling and modular clamping systems. Rigid dedicated tooling uses an integral support structure designed based on the asymmetrical part's profile, achieving rigid fixation through components such as pressure plates and bolts, providing strong positioning and clamping forces. Modular clamping systems consist of standardized support units, clamping units, positioning units, and base plates. Operators can flexibly arrange modules on the machine tool table according to the asymmetrical part's shape characteristics, fixing them with bolts and pressure plates to accommodate the clamping requirements of parts with different drawing numbers.
[0004] However, for rigid dedicated tooling, the slender and asymmetrical cross-section of the C-frame parts easily leads to deformation problems such as warping and shrinkage during machining. Furthermore, different drawing numbers require separate tooling design and manufacturing, resulting in poor versatility and significantly increasing machining costs and manufacturing cycles. While modular clamping systems improve flexibility, they lack dedicated positioning structures that match the asymmetrical structural features of the C-frame parts, making rapid and accurate positioning difficult. Additionally, asymmetrical parts typically require flipping during machining to achieve high-precision forming of both sides. Each flip necessitates readjustment and alignment of each module, a cumbersome and time-consuming process. Pre-machining preparation consumes a significant amount of on-machine time, hindering production efficiency.
[0005] Therefore, there is an urgent need to provide a processing device and method for C-shaped frame asymmetric parts to solve the above problems. Summary of the Invention
[0006] The purpose of this invention is to provide a processing device and method for C-shaped frame asymmetrical parts, which can suppress processing deformation and improve versatility and processing efficiency.
[0007] Based on the above concept, the technical solution adopted by this invention is as follows: A C-shaped frame asymmetric part processing device, comprising: Base; The C-shaped frame blank is symmetrical in the shape of a C and has positioning holes at both ends along the extension direction. The C-shaped frame blank has fixing parts protruding on both sides opposite to each other along the axis of symmetry. Each fixing part has a fixing hole. The C-shaped frame blank has multiple connecting parts and multiple abutting parts protruding on both sides along the width direction. The multiple connecting parts and multiple abutting parts on each side are spaced apart along the extension direction of the C-shaped frame blank and are symmetrical to each other along the axis of symmetry of the C-shaped frame blank. The clamping system, installed on the base, includes two positioning clamps, multiple floating clamps, multiple auxiliary clamps, and two fixed clamps. The positioning pins of the two positioning clamps are respectively inserted through the two positioning holes. The fixing screws of the two fixed clamps are respectively inserted through the two fixing holes and screwed to the locking nuts. The multiple floating clamps correspond one-to-one with the multiple connecting parts, and each floating clamp can clamp or loosen the corresponding connecting part. The multiple auxiliary clamps correspond one-to-one with the multiple abutting parts, and each auxiliary clamp can support the corresponding abutting part.
[0008] Furthermore, each of the connecting parts is provided with a mounting hole, and the floating clamp includes: The first driving component is mounted on the base; A pneumatic locking component is connected to the output end of the first driving component. The pneumatic locking component has a limiting hole, and a radially movable ball is provided inside the pneumatic locking component. A rivet has a connected head and a shank, the head being confined within the mounting hole, and the shank being screwed into the mounting hole and capable of being inserted into the limiting hole; When the pneumatic locking member is ventilated, the ball moves away from the limiting hole. The first driving member can drive the pneumatic locking member to move along the axial direction of the nail rod toward the connecting part until it abuts the connecting part. When the pneumatic locking member is de-ventilated, the ball can lock the nail rod, so that the pneumatic locking member and the nail head together clamp the connecting part.
[0009] Furthermore, the auxiliary clamping includes a second driving member and a ball head. The second driving member is mounted on the base, and the ball head is connected to the output end of the second driving member. The second driving member can drive the ball head to abut against the connecting part.
[0010] Furthermore, the base is provided with multiple cable routing grooves, which are located on both sides of the C-shaped frame blank to accommodate the pipelines connecting the clamping system.
[0011] Furthermore, the base is provided with two cable storage boxes, which are respectively connected to the cable routing channels on both sides.
[0012] Furthermore, the positioning clamp, the floating clamp, the auxiliary clamp, and the fixed clamp are all detachably mounted on the base using fixing bolts.
[0013] The method for machining C-shaped frame asymmetrical parts, using the aforementioned C-shaped frame asymmetrical part machining apparatus, includes: S1. Cut out the shape of the C-shaped frame blank and machine positioning holes and fixing holes on the C-shaped frame blank; S2. Place the C-shaped frame blank on the clamping system, so that the positioning pins of the two positioning clamps are inserted into the two positioning holes respectively, and the fixing screws of the two fixed clamps pass through the two fixing holes respectively and tighten the lock nuts; each floating clamp clamps the corresponding connecting part, and each auxiliary clamp supports the corresponding abutting part. S3. Number the stress grooves to be machined on the front of the C-shaped frame blank in sequence, and use layer-by-layer alternating processing. First, process the odd-numbered stress grooves in each layer, monitor and record the deformation force, then process the even-numbered stress grooves, monitor and record again, and complete the single-layer milling. Repeat the above steps layer by layer until the stress groove depth is still a preset margin from the final depth of the product, then stop the machine, measure the deformation force, release the floating clamp, and perform point measurement of deformation. S4. Continue machining the remaining preset allowance and the end faces of both ends of the C-frame blank. Then stop the machine to release stress deformation. After aging treatment, check the amount of deformation. Then re-clamp the C-frame blank and perform smooth surface machining on the front side of the C-frame blank. S5. Flip the C-frame blank in place on the clamping system and perform rough and fine machining on the reverse side of the C-frame blank. S6. Remove the clamping system, flip the C-frame blank over again, fix it on the base, and perform fine machining on the front side.
[0014] Furthermore, in step S3, the milling depth of each layer is 1mm-3mm, and the preset allowance is twice the milling depth of each layer.
[0015] Furthermore, in step S5, the cutting depth of each layer in the roughing process on the reverse side is 2mm-4mm, and the cutting depth of each layer in the finishing process does not exceed 0.3mm.
[0016] Furthermore, in step S6, the cutting depth of the front finishing process does not exceed 0.1 mm.
[0017] The beneficial effects of this invention are: This invention proposes a machining device for C-shaped frame asymmetric parts. Two positioning pins of the positioning clamps are correspondingly inserted into two positioning holes, realizing rapid initial positioning of the C-shaped frame blank on the base. This solves the defects of modular clamping systems that lack dedicated positioning structures and are difficult to position quickly and accurately. Two fixing screws of the fixed clamps are correspondingly inserted into two fixing holes and screwed with locking nuts, providing reliable axial constraints. Multiple floating clamps correspond to multiple connecting parts on both sides, and multiple auxiliary clamps correspond to multiple abutting parts on both sides of the top support. Through the synergistic effect of floating clamping and auxiliary top support, the overall process rigidity of slender, weak-rigid parts is enhanced, and deformation problems such as warping and shrinkage caused by the slenderness and asymmetry of the cross-section of the parts during machining are suppressed. This overcomes the defects of rigid dedicated devices that are prone to deformation during machining. Meanwhile, because the connecting parts and abutment parts on the C-frame blank are arranged symmetrically along an axis of symmetry, when the part needs to be flipped for machining features on both sides, the flipped positioning holes, connecting parts, and abutment parts can be re-matched with the corresponding positioning clamps, floating clamps, and auxiliary clamps. This eliminates the need for readjustment and alignment of each module, shortening the preparation time for flipping machining. Furthermore, this device is applicable to C-frame parts of different drawing numbers. Only the position of each clamping unit needs to be adjusted according to the part size, eliminating the need to design and manufacture a dedicated device for each drawing number. This reduces processing costs and manufacturing cycle time, overcoming the poor versatility of rigid dedicated devices.
[0018] This invention proposes a machining method for C-shaped frame asymmetrical parts. Based on the aforementioned clamping device, step S1 involves symmetrically setting positioning holes, fixing holes, connecting parts, and abutment parts on the C-shaped frame blank, laying the foundation for subsequent in-situ flipping and adjustment-free clamping. Step S2 achieves precise positioning by quickly inserting positioning pins into the positioning holes, solving the problem of modular systems lacking dedicated positioning structures and difficulty in rapid positioning. Step S3 employs alternating odd and even layer milling, and stops the machine to release deformation when the stress groove depth is still a preset margin from the final depth, avoiding the accumulation of residual stress during machining and causing overall deformation of the part. Step S4 continues machining the remaining preset margin and the end faces, and after aging treatment to release stress, performs smooth surface machining, further stabilizing the part's state. Step S5 utilizes in-situ flipping to achieve rapid switching between front and back machining, eliminating the need to readjust each clamping module, improving clamping versatility and machining efficiency. Step S6 removes the clamping system and flips the part again for finishing the front side, ensuring that both sides meet the final accuracy requirements. Through the above process combination, the final deformation of C-shaped frame asymmetrical parts is reduced, and machining efficiency is improved. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the C-shaped frame asymmetric parts processing device provided in the embodiment of the present invention; Figure 2 yes Figure 1Enlarged view of the structure at point A in the middle; Figure 3 yes Figure 1 Enlarged view of the structure at point B; Figure 4 This is a partial structural schematic diagram of the C-shaped frame asymmetric parts processing device provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the C-shaped frame blank provided in an embodiment of the present invention; Figure 6 This is a structural schematic diagram of a C-shaped frame-type asymmetric part provided in an embodiment of the present invention.
[0020] In the picture: 1. Base; 10. Cable routing channel; 2. C-shaped frame blank; 20. Positioning hole; 21. Fixing part; 210. Fixing hole; 22. Connecting part; 220. Mounting hole; 23. Abutting part; 3. Clamping system; 31. Positioning clamping; 32. Floating clamping; 321. First driving component; 322. Pneumatic locking component; 323. Pull stud; 33. Auxiliary clamping; 331. Second driving component; 332. Ball head; 34. Fixed clamping; 4. Cable storage box. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0022] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0024] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0025] like Figures 1-6 As shown, the present invention provides a C-shaped frame asymmetrical part processing device, including a base 1, a C-shaped frame blank 2, and a clamping system 3. The C-shaped frame blank 2 is C-shaped symmetrical, and positioning holes 20 are provided at both ends along the extension direction. Fixing portions 21 are protruding on opposite sides along the axis of symmetry of the C-shaped frame blank 2, and fixing holes 210 are provided on each fixing portion 21. Multiple connecting portions 22 and multiple abutting portions 23 are protruding on both sides along the width direction of the C-shaped frame blank 2. The multiple connecting portions 22 and multiple abutting portions 23 on each side are spaced apart along the extension direction of the C-shaped frame blank 2 and are opposite to the axis of symmetry of the C-shaped frame blank 2. The clamping system 3 is mounted on the base 1 and includes two positioning clamps 31, multiple floating clamps 32, multiple auxiliary clamps 33, and two fixed clamps 34. The positioning pins of the two positioning clamps 31 are respectively inserted into the two positioning holes 20, and the fixing screws of the two fixed clamps 34 are respectively inserted into the two fixing holes 210 and screwed to the locking nuts. The multiple floating clamps 32 correspond one-to-one with multiple connecting parts 22. Each floating clamp 32 can clamp or loosen the corresponding connecting part 22. The multiple auxiliary clamps 33 correspond one-to-one with multiple abutting parts 23. Each auxiliary clamp 33 can support the corresponding abutting part 23.
[0026] The positioning pins of the two positioning clamps 31 are respectively inserted into the two positioning holes 20, realizing the rapid initial positioning of the C-shaped frame blank 2 on the base 1, solving the defect of the modular clamping system lacking a dedicated positioning structure and making it difficult to position quickly and accurately; the fixing screws of the two fixed clamps 34 are respectively inserted into the two fixing holes 210 and screwed with locking nuts, providing reliable axial constraint; multiple floating clamps 32 are respectively clamped to multiple connecting parts 22 on both sides, and multiple auxiliary clamps 33 are respectively clamped to multiple abutting parts 23 on both sides of the top support. Through the synergistic effect of floating clamping and auxiliary top support, the overall process rigidity of slender and weak rigidity parts is enhanced, and the deformation problems such as warping and shrinkage caused by the slenderness and asymmetry of the cross section of the parts during the processing are suppressed, overcoming the defect of easy deformation in the processing of rigid special devices. Meanwhile, since the connecting part 22 and the abutment part 23 on the C-frame blank 2 are arranged symmetrically about the axis of symmetry, when the part needs to be flipped to process features on both sides, the flipped positioning hole 20, connecting part 22, and abutment part 23 can be re-matched with the corresponding positioning clamp 31, floating clamp 32, and auxiliary clamp 33, without the need to readjust and align each module, thus shortening the preparation time for flipping processing. In addition, this device is applicable to C-frame parts of different drawing numbers. It is only necessary to adjust the position of each clamping unit according to the part size, without the need to design and manufacture a special device for each drawing number, thereby reducing processing costs and manufacturing cycle, and solving the defect of poor versatility of rigid special devices.
[0027] In this embodiment, see Figure 4 The C-shaped frame blank 2 has six floating clamps 32 and four auxiliary clamps 33 on one side along its width direction. All floating clamps 32 and auxiliary clamps 33 are symmetrically distributed about the axis of symmetry of the C-shaped frame blank 2. On each side of the axis of symmetry, an auxiliary clamp 33 is positioned between every two adjacent floating clamps 32. The other side has six auxiliary clamps 33 and four floating clamps 32, also symmetrically distributed about the axis of symmetry of the C-shaped frame blank 2. On each side of the axis of symmetry, a floating clamp 32 is positioned between every two adjacent auxiliary clamps 33. The specific number of floating clamps 32 and auxiliary clamps 33 is not limited and can be flexibly adjusted according to the actual needs of the C-shaped frame blank 2's size, length, and stiffness distribution to adapt to the clamping requirements of asymmetrical parts of different specifications.
[0028] It should be noted that both the floating clamping 32 and the auxiliary clamping 33 are controlled by the host computer. Their control principles and hardware configurations are well-known technologies in the field and will not be described in detail here.
[0029] Specifically, the positioning clamp 31, floating clamp 32, auxiliary clamp 33, and fixed clamp 34 are all detachably mounted on the base 1 using fixing bolts. This detachable mounting with fixing bolts allows users to flexibly adjust the position and layout of each clamping unit on the base 1 according to the varying dimensions of the C-frame blank 2 in different drawing numbers, eliminating the need to redesign and manufacture the entire device. Furthermore, when individual clamping units are damaged, only the corresponding unit needs to be replaced, reducing maintenance costs and downtime.
[0030] Specifically, the positioning clamp 31 includes a positioning post and a positioning pin. The positioning post is detachably installed on the base 1 by fixing bolts, and the positioning pin is located on the top surface of the positioning post.
[0031] In this embodiment, the positioning hole 20 is an oblong hole, and the positioning pin is inserted into the oblong hole accordingly. The oblong hole structure can compensate for the dimensional errors of the C-shaped frame blank 2 caused by processing or heat treatment, reduce the requirements for the processing accuracy of the positioning hole 20, and thus reduce the manufacturing cost; on the other hand, the oblong hole provides a small adjustment margin for the positioning pin along the length of the oblong hole, which can accommodate the small deformation of the blank caused by the release of residual stress.
[0032] Specifically, such as Figure 1 and Figure 2 As shown, each connecting part 22 has a mounting hole 220. The floating clamp 32 includes a first driving member 321, a pneumatic locking member 322, and a pull stud 323. The first driving member 321 is mounted on the base 1. The pneumatic locking member 322 is connected to the output end of the first driving member 321. The pneumatic locking member 322 has a limiting hole, and radially movable balls are provided inside the pneumatic locking member 322 surrounding the limiting hole. The pull stud 323 has a connecting... The nail head and nail shank are provided. The nail head is confined within the mounting hole 220, and the nail shank is screwed into the mounting hole 220 and can be inserted into the limiting hole. When the pneumatic locking member 322 is ventilated, the ball moves away from the limiting hole. The first driving member 321 can drive the pneumatic locking member 322 to move along the nail shank axis toward the connecting part 22 until it abuts the connecting part 22. When the pneumatic locking member 322 is de-ventilated, the ball can lock the nail shank, so that the pneumatic locking member 322 and the nail head together clamp the connecting part 22. With the normally closed design of the pneumatic locking component 322, which unlocks when air is supplied and locks when air is cut off, even if the air supply is unexpectedly interrupted during processing, the ball bearing can still maintain the locking state of the nail rod, avoiding the risk of clamping failure due to air interruption and improving processing safety. At the same time, after the first driving component 321 drives the pneumatic locking component 322 to abut against the connecting part 22, the connecting part 22 is clamped by the nail head and the end face of the pneumatic locking component 322, realizing bidirectional clamping, effectively constraining the degree of freedom of the C-shaped frame blank 2 in the thickness direction, and enhancing clamping stability.
[0033] It should be noted that the pneumatic locking component 322 is an existing zero-point positioning device, and its internal structure and pneumatic principle are well known to those skilled in the art, so they will not be described in detail here.
[0034] In this embodiment, the first driving component 321 is a stepper motor.
[0035] Specifically, as 1 and Figure 3 As shown, the auxiliary clamping 33 includes a second driving member 331 and a ball head 332. The second driving member is mounted on the base 1, and the ball head 332 is connected to the output end of the second driving member 331. The second driving member 331 can drive the ball head 332 to abut against the connecting part 22. The ball head 332 and the abutting part 23 have point contact, which can automatically adapt to the slight tilt or unevenness of the surface of the abutting part 23, avoiding local overload or clamping interference caused by rigid surface contact. At the same time, the ball head can generate a slight self-alignment adjustment during the abutment process, so that the auxiliary support force is applied to the workpiece more evenly, improving the adaptability and reliability of the auxiliary clamping. In addition, the second driving member 331 can provide a constant auxiliary support force according to the machining conditions, working in conjunction with the floating clamping 32 to further enhance the overall process rigidity of slender, weak-rigid parts during the machining process.
[0036] In this embodiment, the second driving component 331 is a cylinder, and a support column is provided under the cylinder body. The support column is installed on the base 1 by fixing bolts, and the end of the piston rod is connected to the ball head 332.
[0037] More specifically, the base 1 has multiple cable routing grooves 10, which are located on both sides of the C-shaped frame blank 2 to accommodate the pipelines connecting the clamping system 3.
[0038] Specifically, the fixing clamp 34 includes a fixing post and a fixing screw. The fixing post is detachably installed on the base 1 by fixing bolts, and the fixing screw is vertically arranged on the top surface of the fixing post.
[0039] Two fixing screws are spaced apart on the top surface of the fixing column. Correspondingly, two fixing holes 210 are opened on the fixing part 21 of the C-shaped frame blank 2. The two fixing screws pass through the two fixing holes 210 and are screwed to the corresponding locking nuts. The double screw configuration can further improve the positioning stability and torsional resistance of the fixing clamp 34.
[0040] Specifically, see Figure 1The base 1 has multiple cable trays 10, which are located on both sides of the C-shaped frame blank 2 to accommodate the pipelines connecting the clamping system 3. By orderly storing the pipelines in the cable trays 10, the pipelines are avoided from being scattered in the processing area, thus improving the safety of the processing process. At the same time, the centralized arrangement of the pipelines in the cable trays 10 makes the overall structure of the clamping system more compact and neat, making it easier for operators to quickly identify and maintain. In addition, the cable trays 10 located on both sides of the C-shaped frame blank 2 can guide the pipelines according to the location of each clamping unit, shortening the pipeline laying length.
[0041] In this embodiment, each floating clamp 32 and each auxiliary clamp 33 are provided with a corresponding wiring groove 10. Each wiring groove 10 extends outward from the installation position of the corresponding clamping unit and converges to the wiring area at the edge of the base 1.
[0042] More specifically, the base 1 is equipped with two cable storage boxes 4, which are connected to the cable routing channels 10 on both sides. By setting up the cable storage boxes 4, the cables gathered from the cable routing channels 10 can be centrally stored in the boxes, making the cable layout on the base 1 neater and more orderly, and avoiding the cables from being scattered and piled up at the edge of the base 1. At the same time, the cable storage boxes 4 provide reserved storage space for the cables. When it is necessary to adjust the position of the floating clamp 32 or the auxiliary clamp 33 to accommodate different drawing numbers of parts, the corresponding length of cable can be released or retrieved from the cable storage boxes 4 without the need to re-lay or cut the cables, improving the convenience and efficiency of the clamping system reconfiguration. In addition, the cable storage boxes 4 can protect the cable joints, preventing external factors such as chips and cutting fluid from contaminating or damaging the air circuit interface, thus extending the service life of the cables.
[0043] In this embodiment, two grooves are provided on the top surface of the base 1, and two cable storage boxes 4 are installed in the two grooves in a corresponding manner.
[0044] The present invention also provides a method for machining C-shaped frame asymmetrical parts, using the above-mentioned C-shaped frame asymmetrical part machining apparatus, comprising: S1. Cut out the shape of the C-shaped frame blank 2, and machine the positioning hole 20 and fixing hole 210 on the C-shaped frame blank 2. S2. Place the C-shaped frame blank 2 on the clamping system 3, so that the positioning pins of the two positioning clamps 31 are inserted into the two positioning holes 20 respectively, and the fixing screws of the two fixing clamps 34 pass through the two fixing holes 210 respectively and tighten the locking nuts; each floating clamp 32 clamps the corresponding connecting part 22, and each auxiliary clamp 33 supports the corresponding abutting part 23. S3. Number the stress grooves to be machined on the front side of the C-shaped frame blank 2 in sequence, and use layer-by-layer alternating processing. First, process the odd-numbered stress grooves in each layer, monitor and record the deformation force, then process the even-numbered stress grooves, monitor and record again, and complete the single-layer milling. Repeat the above steps layer by layer until the stress groove depth is still a preset margin from the final depth of the product, then stop the machine, measure the deformation force, release the floating clamp 32, and perform point measurement of deformation. S4. Continue to process the remaining preset allowance and the two end faces of the C-frame blank 2, then stop the machine to release stress deformation, check the deformation after aging treatment, then re-clamp the C-frame blank 2, and perform smooth surface processing on the front side of the C-frame blank 2. S5. Flip the C-frame blank 2 in place on the clamping system 3 and perform rough and fine machining on the reverse side of the C-frame blank 2. S6. Remove the clamping system 3, flip the C-shaped frame blank 2 over again, fix it on the base 1, and perform fine machining on the front side.
[0045] The C-frame asymmetric part processing method provided by this invention, based on the above-mentioned clamping device, involves the following steps: Step S1: Symmetrically setting positioning holes 20, fixing holes 210, connecting parts 22, and abutting parts 23 on the C-frame blank 2, laying the foundation for subsequent in-situ flipping and adjustment-free clamping; Step S2: Accurate positioning is achieved by quickly inserting positioning pins into the positioning holes, solving the problem of modular systems lacking dedicated positioning structures and being difficult to position quickly; Step S3: Alternating odd and even layer milling is used, and the machine is stopped to release deformation when the stress groove depth is still a preset margin from the final depth, avoiding the accumulation of residual stress during processing and causing overall deformation of the part; Step S4: The remaining preset margin and the end faces are processed, and after aging treatment to release stress, a smooth surface is machined, further stabilizing the part's state; Step S5: In-situ flipping is used to achieve rapid switching between front and back processing, without the need to readjust each clamping module, improving clamping versatility and processing efficiency; Step S6: After removing the clamping system, the front face is flipped again for finishing, ensuring that both sides meet the final accuracy requirements. By combining the above processes, the final deformation of C-shaped frame asymmetrical parts is reduced, and the processing efficiency is improved.
[0046] In this embodiment, in step S1, a mounting hole 220 is installed on the C-shaped frame blank 2, and the mounting hole 220 is a threaded hole.
[0047] In this embodiment, in step S3, see Figure 6 The stress grooves to be processed on the front side of the C-shaped frame blank 2 are numbered from left to right as 2-2-1 to 2-2-11.
[0048] Specifically, in step S3, the milling depth of each layer is 1mm-3mm, and the preset allowance is twice the milling depth of each layer. Controlling the milling depth of each layer within the range of 1mm-3mm ensures material removal efficiency while avoiding sudden release of residual stress and severe workpiece deformation caused by excessive cutting depth in a single layer. The preset allowance of twice the milling depth of each layer, i.e., 2mm-6mm, ensures that deformation is released in advance when there is still a certain margin between the stress groove depth and the final depth. This avoids insufficient stress release due to too small a margin when machining to the final size, or excessive margin leading to increased subsequent machining and reduced efficiency, thus achieving a reasonable balance between stress release effect and machining efficiency.
[0049] In this embodiment, in step S3, the milling depth of each layer is 2mm, and the preset allowance is 4mm.
[0050] In this embodiment, in step S3, if the deformation force exceeds the limit during the processing, the floating clamp 32 can be opened in the processing gap to release the internal stress until the deformation force returns to below the preset value.
[0051] Specifically, in step S4, the aging treatment time is 1-1.5 hours. Controlling the aging treatment time within the range of 1-1.5 hours ensures the full release and rebalancing of residual stress inside the C-shaped frame blank 2, avoiding the problem of incomplete stress release and subsequent deformation due to too short an aging time, while also avoiding the problem of prolonged production cycle and decreased processing efficiency due to too long an aging time. This achieves a reasonable balance between stress release effect and production efficiency.
[0052] Specifically, in step S5, the cutting depth of each layer in the rough machining of the reverse side is 2mm-4mm, and the cutting depth of each layer in the finishing machining does not exceed 0.3mm. After the layered release of stress grooves on the front side, the aging treatment in step S4, and the smooth surface machining, most of the residual stress inside the part has been released, and the part is in a relatively stable state. Therefore, a larger depth of cut is used in the rough machining of the reverse side to improve the material removal efficiency; a smaller depth of cut is used in the finishing machining to ensure the surface quality and dimensional accuracy of the reverse side, while avoiding impact deformation of the thin-walled structure already formed on the front side.
[0053] Specifically, in step S6, the cutting depth of the front finishing process does not exceed 0.1 mm. This range avoids secondary deformation of the already formed reverse structure and the thin wall of the front due to excessive cutting force, thus ensuring the final machining accuracy of the part.
[0054] Finally, experimental verification showed that using this method, the average deformation of C-frame asymmetrical parts was 0.086 mm, the maximum deformation was 0.23 mm, and the deformation at 95.9% of the inspection points was less than 0.2 mm. Compared with the traditional processing method using rigid special equipment, the average deformation of C-frame asymmetrical parts was reduced by about 63%. The size of C-frame asymmetrical parts has reached the 3m level, the processing accuracy is 0.076 mm / m, and the deformation is significantly controlled.
[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A processing device for C-shaped frame-type asymmetrical parts, characterized in that, include: Base (1); The C-shaped frame blank (2) is symmetrical in a C-shape, and positioning holes (20) are provided at both ends along the extension direction. The C-shaped frame blank (2) has a fixing part (21) protruding on both sides opposite to each other along the axis of symmetry. The fixing part (21) has a fixing hole (210) on each side. The C-shaped frame blank (2) has a plurality of connecting parts (22) and a plurality of abutting parts (23) protruding on both sides along the width direction. The plurality of connecting parts (22) and abutting parts (23) on each side are spaced apart along the extension direction of the C-shaped frame blank (2) and are symmetrical to each other along the axis of symmetry of the C-shaped frame blank (2). The clamping system (3), installed on the base (1), includes two positioning clamps (31), multiple floating clamps (32), multiple auxiliary clamps (33) and two fixed clamps (34). The positioning pins of the two positioning clamps (31) are respectively inserted into the two positioning holes (20). The fixing screws of the two fixed clamps (34) are respectively inserted into the two fixing holes (210) and screwed to the locking nut. The multiple floating clamps (32) correspond one-to-one with the multiple connecting parts (22). Each floating clamp (32) can clamp or loosen the corresponding connecting part (22). The multiple auxiliary clamps (33) correspond one-to-one with the multiple abutting parts (23). Each auxiliary clamp (33) can support the corresponding abutting part (23).
2. The C-shaped frame asymmetric parts processing device according to claim 1, characterized in that, Each of the connecting parts (22) is provided with a mounting hole (220), and the floating clamp (32) includes: The first driving component (321) is mounted on the base (1); A pneumatic locking member (322) is connected to the output end of the first driving member (321). The pneumatic locking member (322) has a limiting hole. A ball that can move radially is provided inside the pneumatic locking member (322). A rivet (323) has a connected head and a shank, the head being confined within the mounting hole (220), and the shank being screwed into the mounting hole (220) and capable of being inserted into the limiting hole; When the pneumatic locking member (322) is ventilated, the ball moves away from the limiting hole. The first driving member (321) can drive the pneumatic locking member (322) to move along the axial direction of the nail rod toward the connecting part (22) until it abuts the connecting part (22). When the pneumatic locking member (322) is de-ventilated, the ball can lock the nail rod, so that the pneumatic locking member (322) and the nail head together clamp the connecting part (22).
3. The C-frame asymmetric parts processing device according to claim 1, characterized in that, The auxiliary clamp (33) includes a second drive member (331) and a ball head (332). The second drive member is mounted on the base (1), and the ball head (332) is connected to the output end of the second drive member (331). The second drive member (331) can drive the ball head (332) to abut against the connecting part (22).
4. The C-frame asymmetric parts processing device according to claim 1, characterized in that, The base (1) is provided with multiple cable routing grooves (10), which are located on both sides of the C-shaped frame blank (2) to accommodate the pipelines connecting the clamping system (3).
5. The C-frame asymmetric parts processing device according to claim 4, characterized in that, Two cable storage boxes (4) are provided on the base (1), and the two cable storage boxes (4) are respectively connected to the cable routing grooves (10) on both sides.
6. The C-frame asymmetric parts processing device according to claim 1, characterized in that, The positioning clamp (31), the floating clamp (32), the auxiliary clamp (33) and the fixed clamp (34) are all detachably installed on the base (1) by fixing bolts.
7. A method for machining C-shaped frame-type asymmetrical parts, characterized in that, The C-frame asymmetric part processing apparatus according to any one of claims 1-6 includes: S1. Cut out the shape of the C-shaped frame blank (2) and machine the positioning hole (20) and fixing hole (210) on the C-shaped frame blank (2). S2. Place the C-shaped frame blank (2) on the clamping system (3), so that the positioning pins of the two positioning clamps (31) are inserted into the two positioning holes (20) respectively, and the fixing screws of the two fixing clamps (34) pass through the two fixing holes (210) respectively and tighten the locking nuts; each floating clamp (32) clamps the corresponding connecting part (22), and each auxiliary clamp (33) supports the corresponding abutting part (23). S3. Number the stress grooves to be processed on the front of the C-shaped frame blank (2) in sequence, and process them in layers alternately. Process the odd-numbered stress grooves first, monitor and record the deformation force, then process the even-numbered stress grooves, monitor and record again, and complete the single-layer milling. Repeat the above steps layer by layer until the depth of the stress groove is still a preset margin from the final depth of the product. Stop the machine, measure the deformation force, release the floating clamp (32), and perform point measurement of deformation. S4. Continue to process the remaining preset allowance and process the two end faces of the C-frame blank (2), then stop the machine to release the stress deformation, detect the deformation after aging treatment, then re-clamp the C-frame blank (2), and perform smooth surface processing on the front side of the C-frame blank (2). S5. Flip the C-frame blank (2) in place on the clamping system (3) and perform rough and fine machining on the reverse side of the C-frame blank (2); S6. Remove the clamping system (3), flip the C-shaped frame blank (2) over again, fix it on the base (1), and perform fine machining on the front side.
8. The method for machining C-shaped frame asymmetric parts according to claim 7, characterized in that, In step S3, the milling depth of each layer is 1mm-3mm, and the preset allowance is twice the milling depth of each layer.
9. The method for machining C-shaped frame asymmetric parts according to claim 7, characterized in that, In step S5, the cutting depth of each layer in the roughing process on the reverse side is 2mm-4mm, and the cutting depth of each layer in the finishing process does not exceed 0.3mm.
10. The method for machining C-shaped frame asymmetric parts according to claim 7, characterized in that, In step S6, the cutting depth of the front finishing process does not exceed 0.1 mm.