A clamping fixture for welding corrugated plates to curved workpieces and its usage method

Abstract

This invention relates to the field of laser welding technology, and discloses a clamping fixture and its method for welding corrugated plates and curved workpieces. The clamping fixture includes an internal support mechanism and an external clamping mechanism. The internal support assembly includes multiple inner support plates spaced around the outer periphery of a limiting plate. At least one inner support plate is radially adjustable along the limiting plate. The side of the inner support plate facing away from the limiting plate supports the curved workpiece. The clamping mechanism includes a main shaft, two outer pressure plates, and at least one contoured curved plate. The two outer pressure plates are detachably sleeved and fixed to the main shaft and are located on opposite sides of the limiting plate. Each contoured curved plate has multiple limiting grooves and multiple welding ports, which are alternately distributed. The crests of the corrugated plate are engaged in the multiple limiting grooves. The contoured curved plate is detachably connected between the two outer pressure plates and faces the area to be welded. This achieves efficient welding of corrugated plates and curved workpieces with good welding results, meeting automation requirements.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a clamping fixture and its method of use for welding corrugated plates and curved workpieces. Background Technology

[0002] Corrugated sheets are metal sheets with a wavy texture, mainly made of steel, stainless steel, aluminum, and other metal materials. Welding corrugated sheets to curved surfaces requires supporting fixtures to facilitate the welding process. However, current fixtures used for welding corrugated sheets to curved surfaces suffer from poor workpiece fit and are difficult to adapt to automated applications. For example, patent CN118438022A uses a resistance welding wheel and an internal support fixture to press against each other to ensure the fit between the curved workpiece and the corrugated sheet. This internal support fixture cannot meet the requirements of laser welding. Furthermore, the fixtures used in this welding method require manual positioning of the welding position, and can only weld one corrugated trough at a time, resulting in low welding efficiency and failing to meet automation requirements. In addition, when welding corrugated sheets to curved or cylindrical workpieces, cylindrical workpieces with large diameter tolerances and low elastic modulus will experience stress due to the mismatch in curvature between the supporting fixture and the workpiece, causing the cylindrical workpiece to slide, misalign, or undergo plastic deformation.

[0003] Therefore, there is an urgent need to provide a clamping fixture and a method for using it for welding corrugated plates and curved workpieces to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of this invention is to provide a clamping fixture and method for welding corrugated plates and curved workpieces, so as to achieve efficient welding of corrugated plates and curved workpieces, with good welding effect and meet the needs of automation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A clamping fixture for welding corrugated plates to curved workpieces includes an internal support mechanism and an external clamping mechanism.

[0007] The internal support mechanism includes a limiting plate and an internal support assembly. The internal support assembly includes a plurality of internal support plates spaced around the outer periphery of the limiting plate. At least one of the internal support plates is adjustable in radial position along the limiting plate. The side of the internal support plate facing away from the limiting plate is used to support the curved workpiece.

[0008] The external clamping mechanism includes a main shaft, two external pressure plates, and at least one contoured curved panel. The main shaft passes through the limiting plate, and the axis of the main shaft coincides with the axis of the limiting plate. The two external pressure plates are detachably sleeved on the main shaft and are located on opposite sides of the limiting plate. Each contoured curved panel is provided with multiple limiting grooves and multiple welding joints, which are distributed alternately in sequence. The crests of the corrugated plate are inserted into the multiple limiting grooves. The contoured curved panel is detachably connected between the two external pressure plates and faces the part of the curved workpiece to be welded.

[0009] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, a fixing plate is provided on one side edge of each inner support plate extending radially along the limiting plate, and the fixing plate is movably connected to the limiting plate along the limiting plate.

[0010] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, the fixing plate is provided with a strip-shaped guide hole, the length of which extends radially along the limiting plate, and the limiting plate is provided with at least one guide pin, each of which is movably inserted through one of the strip-shaped guide holes.

[0011] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, the internal support mechanism includes at least one driving member disposed on the limiting plate, and each driving member is connected to a fixed plate for driving the fixed plate to move radially along the limiting plate.

[0012] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, the curved workpiece is a cylindrical workpiece, which is sleeved on the outer periphery of multiple spaced inner support plates. A force feedback sensor is provided on the driving component, and the force feedback sensor is electrically connected to the driving component. The force feedback sensor is used to detect the counter pressure of the cylindrical workpiece on the driving end of the driving component, and the driving component can start and stop according to the pressure.

[0013] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, each of the outer pressure plates has at least one positioning groove on its outer periphery, and each positioning groove penetrates the side of the outer pressure plate opposite to the other outer pressure plate. The contoured curved panel includes a base plate and two protrusions spaced parallel to each other on the base plate, and at least a portion of each protrusion is detachably engaged with one of the positioning grooves.

[0014] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, the curvature of the supporting arc surface of the inner support plate is the curvature corresponding to the difference between the standard value of the inner diameter of the curved workpiece and the maximum tolerance.

[0015] As a preferred embodiment of a clamping fixture for welding corrugated plates and curved workpieces, the curvature of the inner arc surface of the contoured curved plate is the curvature corresponding to the standard value of the outer diameter of the curved workpiece.

[0016] As a preferred embodiment of a clamping fixture for welding corrugated plates to curved workpieces, the two ends of the curved workpiece abut against the opposite surfaces of the two outer pressure plates.

[0017] A method of using a clamping fixture for welding corrugated plates and curved workpieces, based on any one of the above-mentioned clamping fixtures for welding corrugated plates and curved workpieces, includes the following steps:

[0018] The curved workpiece is placed on the inner support plate, and then the corresponding inner support plate is moved to a preset position along the radial direction of the limiting plate.

[0019] The two external pressure plates are respectively sleeved and fixed onto the main shaft from both sides of the limiting plate;

[0020] The crest of the corrugated plate is inserted into the limiting groove of the contoured curved panel, and then the contoured curved panel facing the part to be welded of the curved workpiece is fixed between the two outer pressure plates.

[0021] Rotate the clamping fixture until the welding joint is vertically upward, and use a laser welding device to perform laser welding on the part to be welded and the corrugated plate through the welding joint. After welding, rotate the clamping fixture again until the welding joint is vertically upward, and perform laser welding again. Repeat this process to perform laser welding on all welding joints, and complete the laser welding of all the curved workpieces and the corrugated plate.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention provides a clamping fixture and method for welding corrugated plates and curved workpieces. The clamping fixture includes an internal support mechanism and an external clamping mechanism. The internal support mechanism includes a limiting plate and multiple inner support plates spaced around the outer periphery of the limiting plate. The inner support plates support the curved workpiece, and at least one inner support plate is radially adjustable along the limiting plate, so that the curved workpiece is fixed outside the inner support plate without deformation, awaiting welding. The external clamping mechanism includes two outer pressure plates and at least one contoured curved plate. The contoured curved plate is detachably connected between the two outer pressure plates and faces the part to be welded. Each contoured curved plate has multiple welding ports and multiple limiting grooves for limiting and placing the corrugated plate alternately. The welding ports are used to weld the part to be welded on the curved workpiece and the corrugated plate. The aforementioned clamping fixture provides an internal support mechanism for heavy curved workpieces with low elastic modulus, offering sufficient support for thick-walled, heavy curved workpieces. By moving the position of the inner support plate, it prevents the curved workpiece from sliding and undergoing plastic deformation. Furthermore, an external clamping mechanism fixes the corrugated plate, pressing it firmly against the contoured curved panel surface to improve the fit and allow the contoured curved panel to correct the shape of the corrugated plate. Simultaneously, the contoured curved panel can also screen the corrugated plate, rejecting those that are dimensionally unsuitable and difficult to fit into the contoured groove. Finally, the clamping fixture can rotate axially as a whole, meeting the needs of automated applications. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a structural diagram of the clamping fixture provided in an embodiment of the present invention;

[0026] Figure 2 This is an exploded view of the clamping fixture provided in an embodiment of the present invention;

[0027] Figure 3 It is a cross-sectional view of the corrugated plate being snapped onto the contoured curved panel;

[0028] Figure 4 This is a side view of a clamping fixture provided in another embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the welding fixture platform provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Internal support mechanism; 11. Limiting plate; 12. Internal support assembly; 121. Internal support plate; 122. Fixing plate; 13. Driving component;

[0032] 2. External clamping mechanism; 21. Main shaft; 22. External pressure plate; 221. Positioning groove; 23. Contour curved panel; 231. Limiting groove; 232. Weld joint;

[0033] 3. Curved surface workpieces;

[0034] 4. Corrugated sheet;

[0035] 5. Three-jaw chuck. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely 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 the description of the present invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0040] like Figures 1 to 3 As shown, this embodiment provides a clamping fixture for welding corrugated plates and curved workpieces. The clamping fixture includes an internal support mechanism 1 and an external clamping mechanism 2. The internal support mechanism 1 includes a limiting plate 11 and an inner support assembly 12. The inner support assembly 12 includes a plurality of inner support plates 121 spaced around the outer periphery of the limiting plate 11. At least one inner support plate 121 is adjustable in radial position along the limiting plate 11. The side of the inner support plate 11 facing away from the limiting plate 11 is used to support the curved workpiece 3, so that the curved workpiece 3 is fixed outside the inner support plate 121 without deformation, waiting for welding. The external clamping mechanism 2 includes a main shaft 21, two outer pressure plates 22, and at least one contouring device. The curved panel 23 has a main shaft 21 that passes through the limiting plate 11, with the axis of the main shaft 21 coinciding with the axis of the limiting plate 11. Two external pressure plates 22 are detachably sleeved on the main shaft 21 and are located on both sides of the limiting plate 11. Each contoured curved panel 23 is provided with multiple limiting grooves 231 and multiple welding ports 232. The multiple limiting grooves 231 and multiple welding ports 232 are distributed alternately in sequence. The crests of the corrugated plate 4 are inserted into the multiple limiting grooves 231. The contoured curved panel 23 is detachably connected between the two external pressure plates 22 and faces the part of the curved workpiece 3 to be welded. The welding ports 232 are used to weld the part of the curved workpiece 3 to be welded and the corrugated plate 4. The aforementioned clamping fixture provides an internal support mechanism 1 for the heavy, low-elasticity curved workpiece 3, providing sufficient support for the thick-walled, heavy curved workpiece 3. By moving the position of the inner support plate 121, it prevents the curved workpiece 3 from sliding and undergoing plastic deformation. In addition, the external clamping mechanism 2 fixes the corrugated plate 4, pressing it against the surface of the contoured curved panel 23 to improve the fit of the corrugated plate 4. This allows the contoured curved panel 23 to correct the shape of the corrugated plate 4. At the same time, the contoured curved panel 23 can also screen the corrugated plate 4, rejecting those that are difficult to fit into the contoured groove 231 due to size defects. Finally, the clamping fixture can rotate axially as a whole, meeting the needs of automated application scenarios.

[0041] Specifically, such as Figure 3As shown, multiple limiting grooves 231 are spaced apart on the side of the contoured curved panel 23 near the inner support plate 121. The multiple limiting grooves 231 and multiple welding joints 232 are distributed alternately in sequence. The corrugated plate 4 is inserted into the contoured curved panel 23 from the side near the inner support plate 121. At this time, the crest of the corrugated plate 4 is inserted into the limiting groove 231, and the trough of the corrugated plate 4 corresponds to the multiple welding joints 232, so that the trough of the corrugated plate 4 fits against the curved workpiece 3. The corrugated plate 4 at the trough is welded to the curved workpiece 3 through the welding joints 232.

[0042] In one embodiment, the curved workpiece 3 can be a cylindrical workpiece. The cylindrical workpiece is fitted over the inner support plate 121 and fixed by the internal support mechanism 1, realizing laser welding between the corrugated plate 4 and the cylindrical workpiece. This meets the needs of automated applications and effectively solves the problem of plastic deformation caused by stress due to mismatched curvature of the support fixture for cylindrical workpieces with large diameter tolerances and small elastic modulus. In another embodiment, the curved workpiece 3 can be an arc-shaped workpiece. The arc-shaped workpiece is placed on the inner support plate 121, and then the corresponding inner support plate 121 is moved radially along the limiting plate 11 until the arc-shaped workpiece is in contact with the inner side of the contoured curved panel 23. This facilitates welding between the arc-shaped workpiece and the corrugated plate 4 and meets the needs of automated applications.

[0043] Furthermore, a fixing plate 122 is provided on one side edge of each inner support plate 121 extending radially along the limiting disk 11. The fixing plate 122 is radially movable and connected to the limiting disk 11. The inner support assembly 12 is fixed to the limiting disk 11 by the fixing plate 122, and the fixing plate 122 can move radially relative to the limiting disk 11. In one embodiment, the curved workpiece 3 is a cylindrical workpiece. Before welding begins, the inner support plate 121 is moved toward the main shaft 21 to facilitate the cylindrical workpiece being fitted onto the inner support plate 121. When welding is required, the position of each inner support plate 121 is adjusted according to the inner diameter of the cylindrical workpiece to improve the fit of the cylindrical workpiece relative to the inner support plate 121, so that the cylindrical workpiece is fixed to the outside of the inner support plate 121 without plastic deformation or slippage, waiting for welding. After welding is completed, the inner support plate 121 is moved toward the main shaft 21 to facilitate the removal of the cylindrical workpiece from the inner support plate 121. In another embodiment, the curved workpiece 3 is an arc-shaped workpiece. By moving the fixing plate 122 radially along the limiting plate 11, the arc-shaped workpiece is moved to a suitable position to fit against the inner side of the contoured curved panel 23, which facilitates the welding of the arc-shaped workpiece and the corrugated plate 4.

[0044] Furthermore, the fixing plate 122 has a strip-shaped guide hole, the length of which extends radially along the limiting plate 11. At least one guide pin is provided on the limiting plate 11, and each guide pin movably passes through one strip-shaped guide hole. The guide pins allow the fixing plate 122 to move along the length of the strip-shaped guide hole, preventing the inner support assembly 12 from moving in other directions and failing to fit against the inner side of the curved workpiece, thus affecting the welding effect.

[0045] Specifically, the internal support mechanism 1 includes at least one driving member 13, which is disposed on the limiting disk 11. Each driving member 13 is connected to a fixed plate 122 and is used to drive the fixed plate 122 to move radially along the limiting disk 11. All driving members 13 can simultaneously drive the fixed plate 122 to move radially along the limiting disk 11, thereby realizing the welding of the curved workpiece 3. The driving members 13 can be adjusted according to the actual situation. Of course, in another embodiment, such as... Figure 4 As shown, for a specific part of the curved workpiece 3 to be welded, the driving component 13 corresponding to the specific part to be welded can drive the corresponding fixing plate 122 to move, so that the fixing plate 122 supports the specific part to be welded internally and presses the corresponding contoured curved panel 23 onto the specific part to be welded, thereby realizing the partitioned welding of the curved workpiece 3.

[0046] For example, the driving component 13 can be configured as a cylinder, which is a cylindrical metal component that guides a piston to perform linear reciprocating motion within the cylinder. Air in the engine cylinder expands, converting thermal energy into mechanical energy. In the compressor cylinder, the gas is compressed by the piston, increasing its pressure. The movement of the cylinder piston rod drives the fixed plate 122 to move radially along the limiting plate 11. Since cylinders are a relatively mature existing technology, they will not be described in detail here. Cylinders have the characteristics of large load capacity, fast response, and good adaptability to working environments, and have excellent driving effect on curved workpieces 3 with large weight and low elastic modulus. Of course, in other embodiments, the driving component 13 may also include other structures such as hydraulic cylinders, depending on the actual situation.

[0047] More specifically, the curved workpiece 3 is a cylindrical workpiece, which is fitted around the outer periphery of multiple spaced inner support plates. A force feedback sensor is installed on the drive component 13 and is electrically connected to the drive component 13. The force feedback sensor is used to detect the counter-pressure of the cylindrical workpiece on the drive end of the drive component 13. The drive component 13 can start and stop according to the pressure. The drive component 13 first provides a driving thrust to the fixed plate 122. The fixed plate 122 drives the inner support plate 121 to move radially along the limiting plate 23. When the outer wall of the inner support plate 121 is in contact with the curved workpiece 3, it provides a driving force to the curved workpiece 3. Under the action of the interaction force, the drive end of the drive component 13 is subjected to the counter-pressure of the curved workpiece 3. The force feedback sensor can detect the driving force borne by the cylindrical workpiece in real time, thereby obtaining the counter-pressure of the cylindrical workpiece on the drive end of the drive component 13, controlling the movement of the inner support assembly 12, and preventing the curved workpiece 3 from undergoing plastic deformation. When the driving component 13 is configured as a cylinder, the position of the cylinder piston rod is detected and controlled, and the driving force applied to the fixed plate 122 is detected by the force feedback sensor. These data are fed back to the controller inside the cylinder. The controller adjusts the opening and closing state of the solenoid valve according to the preset position and preset pressure to control the gas inlet and outlet, thereby precisely adjusting the movement of the cylinder piston rod and the driving force applied to the fixed plate 122. The moving position of the cylinder piston rod and the driving force borne by the cylindrical workpiece are set to preset position and preset pressure according to the inner diameter and corresponding curvature of the curved workpiece 3, respectively.

[0048] For example, when fixing a cylindrical workpiece, the cylinder piston rod is first extended or retracted to a preset position. The driving force on the cylindrical workpiece at this point is checked to see if it matches the preset pressure. If they match, the cylinder is stopped, and the inner wall of the cylindrical workpiece fits snugly against the inner support plate. When the driving force on the cylindrical workpiece does not match the preset pressure, the inner diameter of the cylindrical workpiece has a tolerance compared to the standard inner diameter. The position of the cylinder piston rod is adjusted appropriately to move the inner support assembly 12. The driving force detected by the force feedback sensor will experience a sudden increase. The inflection point of this sudden increase is the preset pressure that needs to be monitored. The cylinder is then stopped, completing the fixing of the cylindrical workpiece. This detection method enables precise position and force control of the cylinder, avoiding the risk of plastic deformation of the curved workpiece 3.

[0049] Furthermore, the curvature of the supporting arc surface of the inner support plate 121 is the curvature corresponding to the difference between the standard value of the inner diameter of the curved workpiece 3 and the maximum tolerance. To ensure the clamping fixture is compatible with all possible sizes, and considering the tolerance range, the curvature of the inner support mechanism 1 is preferably chosen to be slightly smaller. This ensures that the curvature of the supporting arc surface of the inner support plate 121 can still fit tightly against the curved workpiece 3 at its maximum size, while also accommodating smaller sizes, preventing damage to the curved workpiece 3 or the inner support mechanism 1 due to excessive tightness. For example, the outer diameter of the cylindrical workpiece is 700mm, with a tolerance of ±2mm, and a thickness of 2mm. The curvature K of the supporting arc surface of the inner support plate 121 is taken as the value of K_inner corresponding to the minimum diameter, i.e., K_inner = 1 / 347 ≈ 2.882mm. -1 .

[0050] Preferably, each outer pressure plate 22 has at least one positioning groove 221 on its outer periphery, each positioning groove 221 penetrating the side of the outer pressure plate 22 opposite to another outer pressure plate 22. The contoured curved panel 23 includes a base plate and two protrusions spaced parallel to each other on the base plate, at least a portion of each protrusion being detachably engaged with a positioning groove 221. Figure 1 and Figure 2 As shown, each boss of the contoured curved panel 23 is partially engaged in the positioning groove 221, and the other part is connected to the outer wall of the curved workpiece 3 to press and limit the curved workpiece 3. Of course, in other embodiments, each boss of the contoured curved panel 23 can be fully engaged in the positioning groove 221 to meet the integral welding of the corrugated plate and the curved workpiece 3. The engagement width of the boss is set according to the actual application. In addition, the boss of the contoured curved panel 23 is provided with threaded holes, which are threadedly connected to the positioning groove of the outer pressure plate 22, thereby connecting the contoured curved panel 23 between the two outer pressure plates 22. Each contoured curved panel 23 corresponds one-to-one with two opposing positioning slots 221 and can be snapped into the opposing positioning slots 221 on two outer pressure plates 22. At the same time, the contoured curved panel 23 is correspondingly arranged with an inner support plate 121, so that the curved workpiece 3 placed outside the inner support plate 121 corresponds to the corrugated plate 4 inside the contoured curved panel 23, thereby realizing the laser welding of the corresponding curved workpiece 3 and the corrugated plate 4.

[0051] More preferably, the two ends of the curved workpiece 3 abut against the opposite surfaces of the two outer pressure plates 22. The axial ends of the curved workpiece 3 and the corresponding positioning grooves 221 of the two outer pressure plates 22 are on the same arc plane, so that the two outer pressure plates 22 have a pressing effect on the curved workpiece 3, and further fix the axial direction of the curved workpiece 3.

[0052] Furthermore, the curvature of the inner arc surface of the contoured curved panel 23 is the curvature corresponding to the standard value of the outer diameter of the curved workpiece 3, ensuring that the corrugated plate 4 and the inner wall of the cylindrical workpiece are fully fitted. The external clamping mechanism 2 serves as the reference for the corrugated plate 4, and its curvature should be strictly equal to the standard value. For workpieces exceeding this range, the equivalent stress obtained by simulation calculation during welding is less than the order of magnitude of the allowable stress for most stainless steels to not undergo plastic deformation, and no deformation will occur. For example, the outer diameter of the cylindrical workpiece is 700 mm with a tolerance of ±2 mm and a thickness of 2 mm. The curvature K of the inner arc surface of the contoured curved panel 23 is taken as the value of K_outer, that is, K_outer = 1 / 350 = 2.857 mm. -1 .

[0053] This embodiment also provides a method for using a clamping fixture for welding corrugated plate 4 and curved workpiece 3. The method for using the clamping fixture includes the following steps:

[0054] S100. Place the curved workpiece 3 on the inner support plate 121, and then move the corresponding inner support plate 121 to the preset position along the radial direction of the limiting plate.

[0055] Specifically, the curved workpiece 3 is selected as a cylindrical workpiece. The cylindrical workpiece is fitted onto the inner support plate 121. The driving component 13 cylinder is activated, and the cylinder piston rod is first extended and retracted to the preset position. It is then checked whether the driving force borne by the cylindrical workpiece at this time is consistent with the preset pressure. If they are consistent, the driving cylinder is stopped. At this time, the inner wall of the cylindrical workpiece is exactly in contact with the inner support plate. When the driving force borne by the cylindrical workpiece is inconsistent with the preset pressure, there is a tolerance between the inner diameter of the cylindrical workpiece and the standard inner diameter. The moving position of the cylinder piston rod is adjusted appropriately to drive the inner support component 12 to move. The driving force detected by the force feedback sensor will have a sudden increase process. The inflection point of this sudden increase in driving force is the preset pressure that needs to be monitored. The driving cylinder is stopped, and the cylindrical workpiece is fixed.

[0056] In another embodiment, the curved workpiece 3 is selected as an arc-shaped workpiece. The curved workpiece 3 is placed on the inner support plate 121, and then the corresponding inner support plate 121 is moved radially along the limiting plate 11 to a preset position to fit against the inner side of the contoured curved panel 121, which facilitates the welding of the arc-shaped workpiece and the corrugated plate 4.

[0057] S200. The two external pressure plates 22 are respectively sleeved and fixed on the main shaft 21 from both sides of the limiting plate 11;

[0058] S300. Insert the crest of the corrugated plate 4 into the limiting groove 231 on the contoured curved panel 23, and then fix the contoured curved panel 23 facing the part to be welded on the curved workpiece 3 between the two outer pressure plates 22.

[0059] Specifically, such as Figure 3As shown, the corrugated plate 4 is inserted into the limiting groove 231 of the contoured curved panel 121 from the side near the inner support plate 121. The corrugated plate 4 is then tapped appropriately with a tool to further conform to the contoured curved panel 23, thus shaping the corrugated plate 4. Next, the contoured curved panel 23 with the corrugated plate 4 is placed into the positioning grooves 221 of the two outer pressure plates 22. The protrusions of the contoured curved panel 23 have threaded holes that connect to the positioning grooves of the outer pressure plates 22 via threads, thereby connecting the contoured curved panel 23 between the two outer pressure plates 22 and completing the fixation of the corrugated plate 4.

[0060] S400, rotate and clamp the fixture until one welding port 232 is vertically upward, and use a laser welding device to perform laser welding on the part to be welded and the corrugated plate 4 through the welding port 232. After the welding is completed, rotate and clamp the fixture again until another welding port 232 is vertically upward, and perform laser welding. In this way, perform laser welding on all welding ports 232 to complete the laser welding of all curved workpieces 3 and corrugated plates 4.

[0061] Specifically, the troughs of the corrugated plate 4 are fitted against the outer wall of the curved workpiece 3, and the welding joint 232 corresponds to the troughs of the corrugated plate 4. Welding is performed between the curved workpiece 3 and the corrugated plate 4 through the welding joint 232. The width of the welding joint 232 is set to 2mm to allow the laser beam to pass through. A gap of no more than 0.5mm is also provided at the contact point between the contoured curved panel 23 and the crest of the corrugated plate 4 to accommodate the tolerances of the corrugated plate 4, facilitating the use of corrugated plates 4 with certain dimensional tolerances at their crests. Figure 5 As shown, after fixing the curved workpiece 3, the two ends of the spindle 21 are respectively installed on the three-jaw chucks on the drive end and driven end of the welding fixture platform positioner unit to complete the clamping and positioning of the clamping fixture. At the same time, the drive end and driven end of the welding fixture platform positioner unit provide power to drive the spindle 21 to rotate, so that the clamping fixture rotates around the spindle 21, thereby making the welding joint 232 vertically upward, which is convenient for laser welding.

[0062] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A clamping fixture for welding corrugated plates to curved workpieces, characterized in that, Includes internal support mechanisms and external clamping mechanisms; The internal support mechanism includes a limiting plate and an internal support assembly. The internal support assembly includes a plurality of internal support plates spaced around the outer periphery of the limiting plate. At least one of the internal support plates is adjustable in radial position along the limiting plate. The side of the internal support plate facing away from the limiting plate is used to support the curved workpiece. The external clamping mechanism includes a main shaft, two external pressure plates, and at least one contoured curved plate. The main shaft passes through the limiting plate, and the axis of the main shaft coincides with the axis of the limiting plate. The two external pressure plates are detachably sleeved on the main shaft and are located on both sides of the limiting plate. Each contoured curved plate is provided with multiple limiting grooves and multiple welding joints. The multiple limiting grooves and multiple welding joints are distributed alternately in sequence. The crests of the corrugated plate are inserted into the multiple limiting grooves. The contoured curved plate is detachably connected between the two external pressure plates and faces the part of the curved workpiece to be welded. The curvature of the inner arc surface of the contoured curved panel is the curvature corresponding to the standard value of the outer diameter of the curved workpiece. The method for using clamping fixtures for welding corrugated plates to curved workpieces includes the following steps: The curved workpiece is placed on the inner support plate, and then the corresponding inner support plate is moved to a preset position along the radial direction of the limiting plate. The two external pressure plates are respectively sleeved and fixed onto the main shaft from both sides of the limiting plate; The crest of the corrugated plate is inserted into the limiting groove of the contoured curved panel, and then the contoured curved panel facing the part to be welded of the curved workpiece is fixed between the two outer pressure plates. Rotate the clamping fixture until the welding joint is vertically upward, so that the trough of the corrugated plate fits against the outer wall of the curved workpiece, and the welding joint corresponds to the trough of the corrugated plate. Use a laser welding device to perform laser welding on the part to be welded and the corrugated plate through the welding joint. After welding, rotate the clamping fixture again until the welding joint is vertically upward, and perform laser welding again. Repeat this process to perform laser welding on all welding joints, thus completing the laser welding of all the curved workpieces and the corrugated plate.

2. The clamping fixture for welding corrugated plates and curved workpieces according to claim 1, characterized in that, A fixing plate is provided on one side edge of each inner support plate, extending radially along the limiting plate, and the fixing plate is movably connected to the limiting plate along the radial direction of the limiting plate.

3. The clamping fixture for welding corrugated plates and curved workpieces according to claim 2, characterized in that, The fixed plate has a strip-shaped guide hole, the length of which extends radially along the limiting plate. The limiting plate is provided with at least one guide pin, and each guide pin is movably inserted through one of the strip-shaped guide holes.

4. The clamping fixture for welding corrugated plates and curved workpieces according to claim 2, characterized in that, The internal support mechanism includes at least one driving member, which is disposed on the limiting plate. Each driving member is connected to a fixed plate for driving the fixed plate to move radially along the limiting plate.

5. The clamping fixture for welding corrugated plates and curved workpieces according to claim 4, characterized in that, The curved workpiece is a cylindrical workpiece, which is sleeved on the outer periphery of multiple spaced inner support plates. A force feedback sensor is provided on the driving component, which is electrically connected to the driving component. The force feedback sensor is used to detect the counter pressure of the cylindrical workpiece on the driving end of the driving component, and the driving component can start and stop according to the pressure.

6. The clamping fixture for welding corrugated plates and curved workpieces according to claim 1, characterized in that, Each of the outer pressure plates has at least one positioning groove on its outer periphery, and each positioning groove passes through the side of the outer pressure plate opposite to the other outer pressure plate. The contoured curved panel includes a base plate and two protrusions that are spaced apart and parallel to each other on the base plate. At least a portion of each protrusion is detachably engaged with one of the positioning grooves.

7. The clamping fixture for welding corrugated plates and curved workpieces according to claim 1, characterized in that, The curvature of the supporting arc surface of the inner support plate is the curvature corresponding to the difference between the standard value of the inner diameter of the curved workpiece and the maximum tolerance.

8. The clamping fixture for welding corrugated plates and curved workpieces according to claim 1, characterized in that, The two ends of the curved workpiece abut against the opposite surfaces of the two external pressure plates.

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