Clamping tool for welding corrugated plate and curved surface workpiece and using method

Abstract

The invention relates to the technical field of laser welding, and discloses a clamping tool for welding a corrugated plate and a curved-surface workpiece and a using method. The clamping tool comprises an internal supporting mechanism and an external pressing mechanism; the inner supporting assembly comprises a plurality of inner supporting plates annularly arranged on the periphery of the limiting disc at intervals, at least one inner supporting plate is adjustable in the radial position of the limiting disc, and the face, away from the limiting disc, of each inner supporting plate is used for supporting a curved surface workpiece. The two outer pressing plates are detachably connected and fixed to the main shaft in a sleeving mode and located on the two sides of the limiting plate respectively, each profiling curved plate is provided with a plurality of limiting grooves and a plurality of welding openings, the limiting grooves and the welding openings are sequentially and alternately distributed, the wave crests of the corrugated plate are clamped into the limiting grooves, the profiling curved plates are detachably connected between the two outer pressing plates, and the limiting grooves and the welding openings are formed in the outer pressing plates. And a to-be-welded part is aligned. Efficient welding of the corrugated plate and the curved-surface workpiece is achieved, the welding effect is good, and the automation requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, and in particular to a clamping tool for welding a corrugated plate and a curved surface workpiece and a use method thereof. Background Art

[0002] Corrugated plate is a metal plate with wavy texture, mainly made of metal materials such as steel plate, stainless steel plate, aluminum plate, etc. When the corrugated plate is welded to a curved surface, a supporting fixture is required to facilitate welding. However, the fixtures used for welding the corrugated plate to the curved surface currently have problems such as low workpiece fit and difficulty in adapting to automated application scenarios. For example, patent CN118438022A ensures the fit of the curved workpiece and the corrugated plate by pressing the resistance welding wheel and the inner support fixture against each other. This inner support fixture cannot meet the needs of laser welding; at the same time, the fixture used in the welding method needs to manually locate the welding position, and only one corrugated plate trough can be welded at a time, so the welding efficiency is low and cannot meet the needs of automation. In addition, when the corrugated plate is welded to an arc-shaped workpiece or a cylindrical workpiece, a cylindrical workpiece with a large diameter tolerance and a small elastic modulus will generate stress due to the mismatch of the fitting curvature of the supporting fixture, thereby causing the cylindrical workpiece to slide, dislocate, or undergo plastic deformation.

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

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

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A clamping fixture for welding a corrugated plate to a curved workpiece, comprising an internal supporting mechanism and an external pressing mechanism;

[0007] The internal support mechanism includes a limit plate and an internal support assembly, wherein the internal support assembly includes a plurality of internal support plates arranged at intervals around the outer periphery of the limit plate, at least one of the internal support plates is adjustable in radial position along the limit plate, and a side of the internal support plate facing away from the limit 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 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 respectively located on both sides of the limiting plate. Each of the contoured curved plates is provided with a plurality of limiting grooves and a plurality of welding ports, and the plurality of limiting grooves and the plurality of welding ports are alternately distributed in sequence. The wave crests of the corrugated plate are inserted into the plurality of limiting grooves. The contoured curved plate is detachably connected between the two external pressure plates and faces the portion to be welded of the curved workpiece.

[0009] As a preferred solution of a clamping fixture for welding a corrugated plate to a curved workpiece, a fixing plate is provided on one side edge of each inner support plate along the radial extension of the limiting plate, and the fixing plate is connected to the limiting plate along the radial movement of the limiting plate.

[0010] As a preferred solution for a clamping fixture for welding corrugated plates and curved workpieces, a strip guide hole is provided on the fixed plate, the length of the strip guide hole extends radially along the limiting plate, and at least one guide pin is provided on the limiting plate, and each guide pin is movably inserted into one of the strip guide holes.

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

[0012] As a preferred solution of a clamping fixture for welding a corrugated plate to a curved workpiece, the curved workpiece is a cylindrical workpiece, and the cylindrical workpiece is sleeved on the outer circumference of a plurality of inner support plates arranged in an interval ring. A force feedback sensor is provided on the driving member, and the force feedback sensor is electrically connected to the driving member. The force feedback sensor is used to detect the back pressure of the cylindrical workpiece exerted on the driving end of the driving member, and the driving member can start and stop according to the pressure.

[0013] As a preferred solution of a clamping fixture for welding corrugated plates to curved workpieces, at least one positioning groove is provided on the outer periphery of each of the outer pressure plates, and each of the positioning grooves passes through a side of the outer pressure plate opposite to the other outer pressure plate. The contoured curved plate includes a base plate and two bosses spaced and parallel from the base plate, and at least a portion of each of the bosses is detachably snapped into one of the positioning grooves.

[0014] As a preferred solution of a clamping fixture for welding a corrugated plate to a curved workpiece, the curvature of the supporting arc surface of the inner support plate is a 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 solution for a clamping fixture used for welding a corrugated plate to a curved workpiece, 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 solution of a clamping fixture for welding a corrugated plate to a curved workpiece, two ends of the curved workpiece abut against opposite surfaces of the two outer pressure plates.

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

[0018] Placing the curved workpiece on the inner support plate, and then moving the corresponding inner support plate to a preset position along the radial direction of the limiting plate;

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

[0020] Insert the wave crest of the corrugated plate into the limiting groove of the contoured curved plate, and then fix the contoured curved plate facing the part to be welded of the curved workpiece between the two outer pressure plates;

[0021] The clamping fixture is rotated until the welding port is vertically upward, and a laser welding device is used to laser weld the portion to be welded and the corrugated plate through the welding port. After welding is completed, the clamping fixture is rotated again until another welding port is vertically upward to perform laser welding, and so on, laser welding is performed on all welding ports to complete laser welding of all the curved workpieces and the corrugated plates.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a clamping tool for welding a corrugated plate and a curved workpiece and a use method thereof, the clamping tool comprising an internal supporting mechanism and an external clamping mechanism; the internal supporting mechanism comprising a limiting disk and an inner supporting plate with a plurality of spacer rings arranged on the outer circumference of the limiting disk, the inner supporting plate being used to support the curved workpiece, and at least one inner supporting plate being adjustable in radial position along the limiting disk, so that the curved workpiece can be fixed outside the inner supporting plate without deformation, waiting for welding; the external clamping mechanism comprising two outer pressure plates and at least one contoured curved plate, the contoured curved plate being detachably connected between the two outer pressure plates and facing the position to be welded, each contoured curved plate being alternately provided with a plurality of welding ports and a plurality of limiting grooves for limiting the placement of the corrugated plate, the welding ports being used to weld the position to be welded of the curved workpiece and the corrugated plate. The clamping fixture provides an internal support mechanism for curved workpieces with large weight and small elastic modulus, provides sufficient support for curved workpieces with thick wall and large mass, and prevents the curved workpiece from sliding and plastic deformation by moving the position of the inner support plate; in addition, the corrugated plate is fixed by an external clamping mechanism, and the corrugated plate is pressed against the surface of the contoured curved plate to improve the fit of the corrugated plate, so that the contoured curved plate corrects the shape of the corrugated plate, and the contoured curved plate can also screen the corrugated plates, and remove the corrugated plates that are difficult to fit into the contoured groove due to unqualified size. Finally, the clamping fixture can be rotated axially as a whole, which can meet the needs of automated application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

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

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

[0027] Figure 3 It is a cross-sectional view of a corrugated plate clamped to a contoured curved plate;

[0028] Figure 4 is a side view of a clamping tool provided by another embodiment of the present invention;

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

[0030] In the figure:

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

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

[0033] 3. Curved workpiece;

[0034] 4. Corrugated board;

[0035] 5. Three-jaw chuck. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] like Figures 1 to 3 As shown, this embodiment provides a clamping fixture for welding a corrugated plate and a curved workpiece, the clamping fixture includes an internal support mechanism 1 and an external clamping mechanism 2; the internal support mechanism 1 includes a limit plate 11 and an internal support assembly 12, the internal support assembly 12 includes a plurality of inner support plates 121 with spacer rings arranged on the outer periphery of the limit plate 11, at least one inner support plate 121 is adjustable in radial position along the limit plate 11, and a side of the inner support plate 11 away from the limit 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 external pressure plates 22 and at least one contouring The curved plate 23 and the main shaft 21 are passed through the limit plate 11, and the axis of the main shaft 21 coincides with the axis of the limit plate 11. The two outer pressure plates 22 are detachably sleeved on the main shaft 21 and are respectively located on both sides of the limit plate 11. Each contoured curved plate 23 is provided with a plurality of limit grooves 231 and a plurality of welding ports 232, which are alternately distributed in sequence. The wave crests of the corrugated plate 4 are inserted into the plurality of limit grooves 231. The contoured curved plate 23 is detachably connected between the two outer pressure plates 22 and faces the portion to be welded of the curved workpiece 3. The welding ports 232 are used to weld the portion to be welded of the curved workpiece 3 and the corrugated plate 4. The above-mentioned clamping fixture provides an internal support mechanism 1 for the curved workpiece 3 with a large weight and a small elastic modulus, provides sufficient support for the curved workpiece 3 with a thick wall and a large mass, and prevents the curved workpiece 3 from sliding and plastic deformation by moving the position of the inner support plate 121; in addition, the corrugated plate 4 is fixed by the external clamping mechanism 2, and the corrugated plate 4 is pressed against the surface of the contoured curved plate 23 to improve the fit of the corrugated plate 4, so that the contoured curved plate 23 corrects the shape of the corrugated plate 4, and at the same time, the contoured curved plate 23 can also screen the corrugated plates 4, and remove the corrugated plates 4 that are difficult to fit into the contoured groove 231 due to unqualified size. Finally, the clamping fixture can be rotated axially as a whole, which can meet the needs of automated application scenarios.

[0041] Specifically, Figure 3As shown, a plurality of limiting grooves 231 are arranged at intervals on one side of the contoured curved panel 23 close to the inner support plate 121, and the plurality of limiting grooves 231 and the plurality of welding openings 232 are alternately distributed in sequence, and the corrugated plate 4 is inserted into the contoured curved panel 23 from the side close to the inner support plate 121. At this time, the crests of the corrugated plate 4 are inserted into the limiting grooves 231, and the troughs of the corrugated plate 4 correspond to the plurality of welding openings 232, so that the troughs of the corrugated plate 4 fit the curved workpiece 3, and the corrugated plate 4 at the troughs is welded to the curved workpiece 3 through the welding openings 232.

[0042] In one embodiment, the curved workpiece 3 can be selected as a cylindrical workpiece, and the cylindrical workpiece is sleeved outside the inner support plate 121 and fixed by the internal support mechanism 1 to achieve laser welding of the corrugated plate 4 and the cylindrical workpiece, meeting the needs of automated application scenarios, and effectively solving the problem of plastic deformation caused by stress generated by the support fixture with mismatched curvature of the cylindrical workpiece with large diameter tolerance and small elastic modulus. In another embodiment, the curved workpiece 3 can be selected as an arc-shaped workpiece, and the arc-shaped workpiece is placed on the inner support plate 121, and then the corresponding inner support plate 121 is moved along the radial direction of the limit plate 11 until the arc-shaped workpiece fits the inner side of the contoured curved plate 23, so as to facilitate the welding of the arc-shaped workpiece and the corrugated plate 4, meeting the needs of automated application scenarios.

[0043] Furthermore, a fixing plate 122 is provided on one side edge of each inner support plate 121 along the radial extension of the limiting disk 11, and the fixing plate 122 is connected to the limiting disk 11 along the radial movement of 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 spindle 21 to facilitate the cylindrical workpiece to be sleeved outside 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 outside the inner support plate 121 without plastic deformation and slipping, waiting for welding; when welding is completed, the inner support plate 121 is moved toward the spindle 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, and the fixed plate 122 is moved radially along the limiting plate 11 to move the arc-shaped workpiece to a suitable position to fit the inner side of the contoured curved plate 23, thereby facilitating welding of the arc-shaped workpiece and the corrugated plate 4.

[0044] Furthermore, a strip guide hole is provided on the fixing plate 122, and the length of the strip guide hole extends radially along the limiting plate 11. The limiting plate 11 is provided with at least one guide pin, and each guide pin is movably inserted into a strip guide hole. The setting of the guide pin enables the fixing plate 122 to move along the length direction of the strip guide hole, preventing the inner support assembly 12 from moving in other directions and failing to fit the inner side of the curved workpiece, which affects the welding effect.

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

[0046] Exemplarily, the driving member 13 can be set as a cylinder, which is a cylindrical metal part that guides the piston to perform linear reciprocating motion in the cylinder. The air in the engine cylinder converts heat energy into mechanical energy by expansion, and the gas is compressed by the piston in the compressor cylinder to increase the pressure. The movement of the cylinder piston rod drives the fixed plate 122 to move radially along the limit plate 11. Since the cylinder is a relatively mature prior art, it will not be described one by one here. The cylinder has the characteristics of large load, fast response, and good adaptability to the working environment. It has an excellent driving effect on the curved workpiece 3 with a large weight and a small elastic modulus. Of course, in other embodiments, the driving member 13 also includes other structures such as hydraulic cylinders, which are determined according to actual conditions.

[0047] More specifically, the curved workpiece 3 is a cylindrical workpiece, which is sleeved on the outer periphery of a plurality of inner support plates arranged at intervals. A force feedback sensor is provided on the driving member 13, which is electrically connected to the driving member 13. The force feedback sensor is used to detect the counter pressure of the cylindrical workpiece on the driving end of the driving member 13, and the driving member 13 can be started and stopped according to the pressure. The driving member 13 first provides a driving thrust to the fixed plate 122, and the fixed plate 122 drives the inner support plate 121 to move along the radial direction of the limit plate 23. When the outer wall of the inner support plate 121 fits the curved workpiece 3, it provides a driving force for the curved workpiece 3. Under the action of the interaction force, the driving end of the driving member 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 borne by the driving end of the driving member 13, controlling the movement of the inner support assembly 12, and preventing the curved workpiece 3 from plastic deformation. When the driving member 13 is set 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 through a force feedback sensor, and these data are fed back to the controller in the cylinder. The controller adjusts the opening and closing state of the solenoid valve according to the preset position and preset pressure, controls the inlet and outlet of the gas, and thus accurately adjusts the movement of the cylinder piston rod and the driving force applied to the fixed plate 122, wherein the moving position of the cylinder piston rod and the driving force borne by the cylindrical workpiece are respectively set to the preset position and preset pressure according to the inner diameter and corresponding curvature of the curved workpiece 3.

[0048] Exemplarily, when fixing a cylindrical workpiece, first extend the cylinder piston rod to a preset position, and detect whether the driving force on the cylindrical workpiece is consistent with the preset pressure. If they are consistent, stop driving the cylinder. At this time, the inner wall of the cylindrical workpiece fits the inner support plate just right. When the driving force on 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 assembly 12 to move. The driving force detected by the force feedback sensor will have a sudden increase process. The inflection point of the sudden increase in driving force is the preset pressure that needs to be monitored. Stop driving the cylinder to complete the fixation of the cylindrical workpiece. The above detection method enables the cylinder to achieve precise position control and force control, 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. In order to make the clamping fixture compatible with all possible sizes as much as possible, combined with the tolerance range, the curvature of the internal support mechanism 1 tends to choose the side with a slightly smaller curvature. This ensures that the curvature of the supporting arc surface of the inner support plate 121 can still fit tightly with the curved workpiece 3 at the maximum size, while also being able to adapt to smaller sizes, avoiding damage to the curved workpiece 3 or the internal support mechanism 1 due to over-tightening. By way of example, the outer diameter of the cylindrical workpiece is 700 mm in diameter, the tolerance is ±2 mm, and the thickness is 2 mm. The curvature K of the supporting arc surface of the inner support plate 121 takes the value of K_inner corresponding to the minimum diameter, that is, K_inner = 1 / 347≈2.882 mm -1 .

[0050] Preferably, at least one positioning groove 221 is formed on the outer periphery of each outer pressure plate 22, and each positioning groove 221 passes through a side of the outer pressure plate 22 opposite to another outer pressure plate 22. The contoured curved plate 23 includes a bottom plate and two bosses spaced and parallelly protruding from the bottom plate, and at least a portion of each boss is detachably engaged with a positioning groove 221. Figure 1 and Figure 2 As shown, a part of each boss of the profiling curved plate 23 is clamped in the positioning groove 221, and the other part is connected to the outer wall of the curved workpiece 3 to compress and limit the curved workpiece 3. Of course, in other embodiments, each boss of the profiling curved plate 23 can be fully clamped in the positioning groove 221 to meet the overall welding of the corrugated plate and the curved workpiece 3, and the boss clamping width is set according to the actual application. In addition, a threaded hole is provided on the boss of the profiling curved plate 23, which is connected to the positioning groove of the outer pressure plate 22 by a thread, so that the profiling curved plate 23 is connected between the two outer pressure plates 22. Each contoured curved panel 23 corresponds one-to-one to two oppositely arranged positioning grooves 221, and can be snapped into the oppositely arranged positioning grooves 221 on the two outer pressure plates 22. At the same time, the contoured curved panel 23 is arranged corresponding to an inner support plate 121, so that the curved workpiece 3 placed outside the inner support plate 121 is arranged corresponding to the corrugated plate 4 inside the contoured curved panel 23, thereby realizing 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 two axial ends of the curved workpiece 3 and the corresponding positioning grooves 221 of the two outer pressure plates 22 are in the same arc plane, so that the two outer pressure plates 22 have a pressing effect on the curved workpiece 3, and the axial direction of the curved workpiece 3 is further fixed.

[0052] Furthermore, the curvature of the inner arc surface of the contoured curved plate 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 is used as the reference of 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 the deformation during welding is less than the order of magnitude of the allowable stress of most stainless steel without plastic deformation, and no deformation will occur. For example, the outer diameter of the cylindrical workpiece is 700mm in diameter, the tolerance is ±2mm, and the thickness is 2mm. The curvature K of the inner arc surface of the contoured curved plate 23 takes the value of K_outer, that is, K_outer = 1 / 350 = 2.857mm -1 .

[0053] This embodiment also provides a method for using a clamping tool for welding a corrugated plate 4 and a curved workpiece 3, and the method for using the clamping tool comprises the following steps:

[0054] S100, placing the curved workpiece 3 on the inner support plate 121, and then moving the corresponding inner support plate 121 to a preset position along the radial direction of the limiting plate;

[0055] Specifically, the curved workpiece 3 is selected as a cylindrical workpiece, and the cylindrical workpiece is sleeved on the inner support plate 121. The driving member 13 cylinder is started, and the cylinder piston rod is first extended and retracted to the preset position to detect 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 fits exactly 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 assembly 12 to move. The driving force detected by the force feedback sensor will have a sudden increase process. The inflection point of the sudden increase in the driving force is the preset pressure that needs to be monitored. The driving cylinder is stopped to complete the fixation of the cylindrical workpiece.

[0056] In another embodiment, the curved workpiece 3 is selected as an arc-shaped workpiece, and the curved workpiece 3 is placed on the inner support plate 121. The corresponding inner support plate 121 is then moved to a preset position along the radial direction of the limit plate 11 to fit the inner side of the contoured curved plate 121, thereby facilitating the welding of the arc-shaped workpiece and the corrugated plate 4.

[0057] S200, the two outer pressure plates 22 are respectively sleeved and fixed on the main shaft 21 from both sides of the limit plate 11;

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

[0059] Specifically, Figure 3As shown, the corrugated plate 4 is inserted into the limiting groove 231 of the contoured curved plate 121 from the side close to the inner support plate 121, and the corrugated plate 4 is appropriately knocked with a tool to make the corrugated plate 4 further fit the contoured curved plate 23, which has a shaping effect on the corrugated plate 4. Then, the contoured curved plate 23 with the corrugated plate 4 is placed into the positioning groove 221 of the two outer pressure plates 22. The boss of the contoured curved plate 23 is provided with a threaded hole, which is connected to the positioning groove of the outer pressure plate 22 through a thread, so that the contoured curved plate 23 is connected between the two outer pressure plates 22, and the corrugated plate 4 is fixed.

[0060] S400, rotate the clamping fixture to a welding port 232 facing vertically upward, use a laser welding device to laser weld the welding portion and the corrugated plate 4 through the welding port 232, and after welding, rotate the clamping fixture again to another welding port 232 facing vertically upward to perform laser welding, and so on, perform laser welding on all welding ports 232 to complete laser welding of all curved workpieces 3 and corrugated plates 4.

[0061] Specifically, the trough of the corrugated plate 4 fits with the outer wall of the curved workpiece 3, and the welding port 232 corresponds to the trough of the corrugated plate 4. The curved workpiece 3 and the corrugated plate 4 are welded through the welding port 232. The width of the welding port 232 is set to 2mm to allow the laser beam to pass through. A clearance of no more than 0.5mm is also set at the joint between the contoured curved plate 23 and the crest of the corrugated plate 4 to match the tolerance of the corrugated plate 4, so that the corrugated plate 4 with a certain size tolerance at some crests can be used. Figure 5 As shown, after the curved workpiece 3 is fixed, the two ends of the spindle 21 are respectively mounted on the three-jaw chucks on the driving end and the driven end of the welding tooling platform positioner to complete the clamping and positioning of the clamping tool. At the same time, the driving end and the driven end of the welding tooling platform positioner provide power to drive the rotation of the spindle 21, so that the clamping tool rotates around the spindle 21, thereby turning the welding port 232 vertically upward to facilitate laser welding.

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

Claims

1. A clamping fixture for welding a corrugated plate to a curved workpiece, characterized in that: It includes an internal supporting mechanism and an external pressing mechanism; The internal support mechanism includes a limit plate and an internal support assembly, wherein the internal support assembly includes a plurality of internal support plates arranged at intervals around the outer periphery of the limit plate, at least one of the internal support plates is adjustable in radial position along the limit plate, and a side of the internal support plate facing away from the limit 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 respectively located on both sides of the limiting plate. Each of the contoured curved plates is provided with a plurality of limiting grooves and a plurality of welding ports, and the plurality of limiting grooves and the plurality of welding ports are alternately distributed in sequence. The wave crests of the corrugated plate are inserted into the plurality of limiting grooves. The contoured curved plate is detachably connected between the two external pressure plates and faces the portion to be welded of the curved workpiece.

2. The clamping fixture for welding a corrugated plate to a curved workpiece according to claim 1, characterized in that: A fixing plate is provided on one side edge of each inner support plate and extends radially along the limiting plate, and the fixing plate is connected to the limiting plate in a radially movable manner along the limiting plate.

3. The clamping fixture for welding a corrugated plate to a curved workpiece according to claim 2, characterized in that: The fixing plate is provided with a strip 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 into one of the strip guide holes.

4. The clamping fixture for welding a corrugated plate to a curved workpiece according to claim 2, characterized in that: The internal support mechanism includes at least one driving member, and the driving member is arranged on the limiting plate. Each of the driving members is drivingly connected to one of the fixing plates to drive the fixing plate to move radially along the limiting plate.

5. The clamping fixture for welding a corrugated plate to a curved workpiece according to claim 4, characterized in that: The curved workpiece is a cylindrical workpiece, which is sleeved on the outer circumference of a plurality of inner support plates arranged at intervals. A force feedback sensor is provided on the driving member, and the force feedback sensor is electrically connected to the driving member. The force feedback sensor is used to detect the back pressure of the cylindrical workpiece exerted on the driving end of the driving member, and the driving member can start and stop according to the pressure.

6. The clamping fixture for welding a corrugated plate to a curved workpiece according to claim 1, characterized in that: At least one positioning groove is formed on the outer periphery of each of the outer pressure plates, and each of the positioning grooves runs through a side of the outer pressure plate opposite to another outer pressure plate. The contoured curved plate includes a base plate and two bosses spaced and parallel from the base plate, and at least a portion of each of the bosses is detachably snapped into one of the positioning grooves.

7. The clamping fixture for welding a corrugated plate to a curved workpiece 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 a corrugated plate to a curved workpiece according to claim 1, characterized in that: 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.

9. The clamping fixture for welding a corrugated plate to a curved workpiece according to claim 1, characterized in that: The two ends of the curved workpiece abut against the opposite surfaces of the two outer pressure plates.

10. A method for using a clamping fixture for welding a corrugated plate and a curved workpiece, based on the clamping fixture for welding a corrugated plate and a curved workpiece according to any one of claims 1 to 9, characterized in that: The following steps are involved: Placing the curved workpiece on the inner support plate, and then moving the corresponding inner support plate to a preset position along the radial direction of the limiting plate; The two outer pressure plates are respectively sleeved and fixed on the main shaft from both sides of the limiting plate; Insert the wave crest of the corrugated plate into the limiting groove of the contoured curved plate, and then fix the contoured curved plate facing the part to be welded of the curved workpiece between the two outer pressure plates; The clamping fixture is rotated until the welding port is vertically upward, and a laser welding device is used to laser weld the portion to be welded and the corrugated plate through the welding port. After welding is completed, the clamping fixture is rotated again until another welding port is vertically upward to perform laser welding, and so on, laser welding is performed on all welding ports to complete laser welding of all the curved workpieces and the corrugated plates.

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