Anti-deformation laser processing clamp for large thin-wall workpiece

Abstract

The invention relates to the field of five-axis laser cutting machines, in particular to an anti-deformation large thin-wall workpiece laser machining clamp which comprises a main frame, an outer supporting assembly, a clamping mechanism and an inner supporting assembly. The main frame is connected with the machine tool, the outer supporting assembly and the clamping mechanism, the outer supporting assembly is arranged on the top of the main frame, and the outer supporting assembly supports the outer wall and the bottom wall of the large thin-wall workpiece. The clamping mechanism is used for clamping the flange edge of the large thin-wall workpiece; the inner supporting assembly comprises a positioning frame capable of being independently placed and taken out, a lower supporting block arranged at the bottom of the positioning frame and inner supporting blocks arranged on the two sides of the positioning frame in the length direction, the lower supporting block makes contact with the bottom of the inner wall of the large thin-wall workpiece, and the inner supporting blocks support the side portion of the inner wall of the large thin-wall workpiece. According to the embodiment of the invention, through precise external positioning, internal supporting and pneumatic clamping, high-precision positioning, shape keeping and stable clamping of the large thin-wall workpiece in the laser machining process are effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of five-axis laser cutting machines, and in particular to a deformation-resistant laser processing fixture for large thin-walled workpieces. Background Art

[0002] The five-axis laser cutting machine is used for contour cutting and hole cutting of hot-formed parts. It can also be used for the processing of special-shaped structural pipes formed by hydraulic forming or punching and welding, as well as the production of trial parts for modified models and new models, etc.

[0003] Laser cutting fixtures are used to fix large thin-walled workpieces to ensure the accurate position of the workpiece during laser cutting and prevent it from moving or shaking, thereby ensuring cutting accuracy and quality.

[0004] Existing laser cutting fixtures are not suitable for fixing products with long dimensions and large areas (such as Figure 1 The product shown in the figure is prone to the situation where the middle part of the product expands outward or is squeezed inward and deformed, which in turn affects the accuracy of laser cutting. Summary of the Invention

[0005] The purpose of the present invention is to provide a deformation-resistant laser processing fixture for large thin-walled workpieces, so as to solve the problems of deformation, dimensional deviation and other problems caused by improper fixation and insufficient rigidity of large thin-walled workpieces during laser cutting.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A laser processing fixture for large thin-walled workpieces that prevents deformation, comprising: a main frame, an outer support assembly, a clamping mechanism, and an inner support assembly; The main frame is used to connect the machine tool with the outer support assembly and the clamping mechanism, thereby providing positioning and stable support for the outer support assembly and the clamping mechanism; The outer support assembly is arranged on the top of the main frame, and the outer support assembly is used to directly support the outer wall and bottom wall of a large thin-walled workpiece; The clamping mechanism is used to clamp the flange edge of the large thin-walled workpiece, thereby firmly connecting the large thin-walled workpiece and the outer support assembly; The inner support assembly includes a positioning frame that can be placed and removed independently, a lower support block arranged at the bottom of the positioning frame, and inner support blocks arranged on both sides of the length direction of the positioning frame. The lower support block contacts the bottom of the inner wall of the large thin-walled workpiece, and the inner support block supports the inner wall side of the large thin-walled workpiece.

[0007] Furthermore, the outer support assembly is added at intervals of 400 mm to 600 mm, and at least two outer support assemblies are arranged at each major corner of the large thin-walled workpiece for collaborative support.

[0008] Furthermore, the outer support assembly includes a first support rod and an outer support block connected to each other by bolts, the first support rod is made of metal, the outer support block is made of nylon, and the outer support block directly supports the outer wall and bottom wall of the large thin-walled workpiece.

[0009] Furthermore, the clamping mechanism includes a second support rod, a static clamping jaw, a dynamic clamping jaw and a clamping jaw driver; The second support rod is made of metal, and the second support rod connects the main frame with the static clamp and the clamp driver, thereby providing positioning and stable support for the clamp driver and the static clamp; The static clamping jaw is made of nylon and directly supports the edge of the large thin-walled workpiece. The contact surface shape of the static clamping jaw is customized according to the actual curvature of the flange of the large thin-walled workpiece. The dynamic clamping jaw is made of nylon and is fixedly connected to the actuator of the clamping jaw driver. The clamping jaw driver is used to drive the dynamic clamping jaw to move closer to or away from the static clamping jaw.

[0010] Furthermore, the clamping jaw driver is a lever cylinder, and a pneumatic switch handle is provided on the main frame, and the pneumatic switch handle is connected to each of the lever cylinders through an air pipe.

[0011] Furthermore, the main frame includes a top plate and a bottom plate, the first support rod and the second support rod are fixedly connected to the top plate, and the surfaces of the top plate, the first support rod and the second support rod are blackened.

[0012] Furthermore, a circle of light shielding plates is set along the outline of the large thin-walled workpiece, and the surface of the light shielding plates is blackened. The light shielding plates are set at a position where the laser can directly illuminate or indirectly reflect to the outer wall of the large thin-walled workpiece after penetrating the large thin-walled workpiece.

[0013] Furthermore, two easy-to-grasp handles are symmetrically installed in the middle part of the positioning frame.

[0014] Furthermore, the inner support assembly further comprises: a rotary cylinder, a rotating seat, four connecting rods, four telescopic slides and a quick pneumatic joint; The rotary cylinder is arranged at the geometric center of the positioning frame, and has a vertically arranged output shaft, and the rotating seat is fixedly connected to the output shaft of the rotary cylinder; One end of the four connecting rods is hinged to the rotating seat, and the other end is connected to the four telescopic slides respectively; Each slide is detachably connected to an inner support block for contacting the inner wall of the product, and is slidably connected to the frame body of the positioning frame; The quick pneumatic joint is arranged at the edge of the positioning frame, and the quick pneumatic joint includes an air inlet and an air outlet with a normally closed design. The air inlet and the air outlet of the quick pneumatic joint are connected to the air inlet and the air outlet of the rotary cylinder, and the air inlet and the air outlet of the quick pneumatic joint are opened only when an external air source is connected.

[0015] Furthermore, each of the telescopic slides includes: a first slider, a spring and a second slider, the inner support block is detachably connected to the first slider, the first slider is slidably connected to the second slider, the spring is arranged between the first slider and the second slider, the spring is used to provide buffering and preload, the second slider is slidably connected to the positioning frame, and one end of each connecting rod is hinged to a second slider.

[0016] Compared with the prior art, this application has the following beneficial effects: The embodiments of the present invention effectively ensure high-precision positioning, shape retention, and stable clamping of large thin-walled workpieces during laser processing through precise external positioning, internal support, and pneumatic clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0018] Figure 1 This is a three-dimensional image of a large thin-walled workpiece; Figure 2 A perspective view of a main frame and an outer support assembly according to a first embodiment of the present invention; Figure 3 A perspective view of a main frame, an outer support assembly, and a large thin-walled workpiece according to a first embodiment of the present invention; Figure 4 A perspective view of a main frame, an outer support assembly, an inner support assembly, and a large thin-walled workpiece according to a first embodiment of the present invention; Figure 5 is a perspective view of an inner support assembly according to a first embodiment of the present invention; Figure 6 A perspective view of a main frame, an outer support assembly, an inner support assembly, a light shield, and a large thin-walled workpiece according to a first embodiment of the present invention; Figure 7 A perspective view of a main frame, an outer support assembly, an inner support assembly, a light shield, and a large thin-walled workpiece according to a second embodiment of the present invention; Figure 8 is a top view of an inner support assembly according to a second embodiment of the present invention; Figure 9 for Figure 8 Cross-sectional view in the AA direction; Figure 10 An assembly diagram of a telescopic slide according to a second embodiment of the present invention; The numbers in the figure represent the following: 1-main frame; 11-bottom plate; 12-top plate; 2-external support assembly; 21-first support rod; 22-external support block; 3-clamping mechanism; 31-second support rod; 32-static clamping jaw; 33-dynamic clamping jaw; 34-clamping jaw driver; 35-pneumatic switch handle; 4-inner support assembly; 41-positioning frame; 411-lower support block; 412-handle; 42-inner support block; 43-rotating seat; 431-rotary cylinder; 432-quick pneumatic joint; 44-connecting rod; 45-telescopic slide; 451-first slider; 452-spring; 453-second slider; 5-light shielding plate. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] (First embodiment, refer to Figures 1 to 6 ) This specific embodiment provides a deformation-resistant laser processing fixture for large thin-walled workpieces, aiming to solve the problems of deformation and dimensional deviation caused by improper fixation and insufficient rigidity of large thin-walled workpieces during the laser cutting process.

[0021] refer to Figure 2 、 Figure 3 and Figure 4 The laser processing fixture includes a positioning jig and a shaping jig. The positioning jig is used to constrain the position of the product to ensure that the product is accurately positioned during the laser cutting process and does not move or shake, thereby ensuring the final cutting accuracy and quality. The shaping jig is used to constrain the shape of the product and provide effective support inside the product to maintain the accuracy of the product contour and avoid cutting size deviations caused by product deformation.

[0022] refer to Figure 2The positioning fixture includes a main frame 1, an outer support assembly 2 and a clamping mechanism 3. The position and number of the outer support assembly 2 are arranged on the top of the main frame 1 according to the shape characteristics and support requirements of the large thin-walled workpiece. The outer support assembly 2 is used to directly support the outer wall and bottom wall of the large thin-walled workpiece. The clamping mechanism 3 is used to clamp the flange edge of the large thin-walled workpiece at a position of about 15 mm, thereby firmly connecting the large thin-walled workpiece and the outer support assembly 2. The main frame 1 is used to connect the machine tool to provide positioning and stable support for the outer support assembly 2 and the clamping mechanism 3.

[0023] refer to Figure 3 and Figure 4 The shaping jig includes an inner support assembly 4, which includes a positioning frame 41 that can be placed and removed independently, a lower support block 411 arranged at the bottom of the positioning frame 41, and inner support blocks 42 arranged on both sides of the positioning frame 41 in the length direction.

[0024] The main frame 1 is an aluminum profile frame built from multiple aluminum profiles according to the outline dimensions of a large thin-walled workpiece. Multiple aluminum profile beams are fixed inside. Four stainless steel bottom plates 11 with dimensions of 280mm x 160mm x 20mm are fixed at the bottom, and a top plate 12 made of aluminum alloy with a thickness of 15mm is fixed on the top.

[0025] Regarding the connection structure between the positioning fixture and the machine tool: two first through holes are provided on each base plate 11. The diameter and relative position of the first through holes are precisely determined according to the mounting interface of the fixed base on the matching machine tool, so that the main frame 1 precisely corresponds to the fixed base of the laser equipment machine tool. The top plate 12 is provided with a second through hole. The position of the second through hole corresponds one-to-one to the position of the first through hole, and the aperture of the second through hole is designed to be 2 to 3 times the aperture of the first through hole, so that the staff can use high-strength bolts to firmly mount the base plate 11 on the machine tool through the second through hole above the positioning fixture.

[0026] refer to Figure 2 The outer support assembly 2 includes a first support rod 21 and an outer support block 22 connected to each other by bolts. The first support rod 21 is an L-shaped metal block made of Q235 carbon steel, and the outer support block 22 is a contoured block made of nylon. The outer support block 22 directly supports the outer wall and bottom wall of the large thin-walled workpiece. The contact surface shape of the outer support block 22 is customized according to the actual curvature of the outer wall of the large thin-walled workpiece to achieve fitting support with the product. The first support rod 21 is used to connect to the main frame 1 to provide positioning and stable support for the outer support block 22.

[0027] refer to Figure 3Each external support assembly 2 is firmly fixed to the top plate 12 of the main frame 1 by bolts. The layout principle is: at least two external support assemblies 2 are configured at each major corner of the product for collaborative support. At the same time, according to the extension length of the product flange, an additional external support assembly 2 is added approximately every 400mm-600mm.

[0028] refer to Figure 2 The clamping mechanism 3 includes a second support rod 31, a static clamping jaw 32, a dynamic clamping jaw 33 and a clamping jaw driver 34. The static clamping jaw 32 directly supports the edge of the large thin-walled workpiece. The contact surface shape of the static clamping jaw 32 is customized according to the actual curvature of the flange of the large thin-walled workpiece to achieve a fitting support with the product. The second support rod 31 provides positioning and stable support for the clamping jaw driver 34 and the static clamping jaw 32. The dynamic clamping jaw 33 is fixedly connected to the actuator of the clamping jaw driver 34. The clamping jaw driver 34 preferably adopts a lever cylinder. A pneumatic switch handle 35 is provided on the top plate 12 of the main frame 1. The pneumatic switch handle 35 is connected to each lever cylinder through an air pipe. The operator can centrally control all the clamping mechanisms 3 through the pneumatic switch handle 35 to achieve synchronous clamping and loosening of the workpiece.

[0029] refer to Figure 5 The positioning frame 41 is constructed from multiple aluminum profiles based on the internal size characteristics of large thin-walled workpieces. Its typical length is designed to be about 450mm, and its width needs to be less than 40% of the actual width of the product's inner wall to ensure that it can be smoothly placed inside the product and leave room for adjustment. The adjacent aluminum profiles that constitute the positioning frame 41 are also connected with bolts and nuts, or supplemented by angle brackets.

[0030] The lower support block 411 and the inner support block 42 are both contoured blocks made of nylon.

[0031] The lower support blocks 411 are installed at the four corners of the bottom of the positioning frame 41. The function of the lower support blocks 411 is to prevent the positioning frame 41 from directly contacting the bottom of the inner wall of the product to prevent possible scratches.

[0032] The inner support blocks 42 are installed at the four corners of the top of the positioning frame 41 and close to the two sides in the length direction of the positioning frame 41. A portion of the inner support blocks 42 extends out of the frame, thereby supporting the inner wall of the large thin-walled workpiece from the inside to repair the deformation and dimensional deviation of the large thin-walled workpiece due to its own insufficient rigidity.

[0033] In order to facilitate the operator to quickly and accurately place the manual positioning frame 41 to a predetermined position inside the product or remove it, two easy-to-grasp handles 412 are symmetrically installed in the middle part of the positioning frame 41.

[0034] To use the inner support assembly 4: A large, thin-walled workpiece is secured to the outer support assembly 2. The operator, holding handle 412, places the positioning frame 41 into the workpiece's internal cavity. The operator manually adjusts the distance that the inner support blocks 42 at the four corners of the frame extend beyond the frame, ensuring that their ends precisely contact the corresponding points on the workpiece's inner wall. If the workpiece's center tends to squeeze inward, the nylon blocks apply an appropriate counterforce, pushing it back to its correct contour. If it tends to expand outward, the frame's outer dimensions, combined with the nylon blocks, act as a restraining force.

[0035] In summary, the positioning jig and shaping jig effectively ensure high-precision positioning, shape retention and stable clamping of large thin-walled workpieces during laser processing through precise external positioning, internal support and pneumatic clamping.

[0036] Furthermore, since the refraction and reflection of the laser beam during the five-axis laser cutting process may easily cause accidental damage to the non-cutting area of the product (especially the inner wall around the flange), in order to ensure the integrity of the product appearance during the cutting process, this embodiment is further optimized to protect the exterior of large thin-walled workpieces, mainly including two technical means, reference Figure 6 .

[0037] Technical means 1: blackening the surface of the main components: the blackened surfaces include the top plate 12 of the main frame 1, the first support rod 21 of the outer support assembly 2, and the second support rod 31 of the clamping mechanism. The blackened color can not only effectively absorb stray lasers and reduce reflections, but also enhance the corrosion resistance of aluminum and Q235 carbon steel to a certain extent.

[0038] Technical means 2: additionally set up a light shielding plate 5: on the periphery of the support component, according to the outline size of the large thin-walled workpiece, a circle of light shielding plates 5 made of Q235 carbon steel is specially built. The thickness of the light shielding plate 5 is selected to be 2mm, so that it has sufficient strength to resist scattered laser. Like the other metal parts mentioned above, the light shielding plate 5 is also treated with a blackening process as a whole to enhance its laser absorption ability.

[0039] In summary, by subjecting the main components to a surface blackening treatment that effectively absorbs light, and combining it with a blackened light shielding plate 5, a dual protection system combining active absorption and passive blocking is constructed. This system effectively solves the problems of product appearance damage and equipment safety caused by light refraction and reflection during the laser cutting process. In particular, for those flange peripheral holes that are close to the inner wall of the product, the laser beam is very likely to irradiate or reflect onto the inner wall of the product after penetrating the workpiece. The light shielding plate 5 can effectively block and absorb these lasers that may cause damage.

[0040] (Second embodiment, refer to Figures 7 to 10 ) The second embodiment improves the internal support assembly 4 proposed in the first embodiment, and its purpose is also to solve the problem of deformation of the middle part of long-sized, large-area thin-walled products that is prone to occur during the processing. The difference between it and the internal support assembly 4 proposed in the first embodiment is that the internal support assembly 4 proposed in the second embodiment is intended to achieve automatic extension and adaptive fitting of the inner support block 42 through pneumatic drive, thereby improving operational efficiency and the accuracy and consistency of support.

[0041] refer to Figure 7 、 Figure 8 The inner support assembly 4 of the second embodiment further includes: a rotary cylinder 431 , a rotating seat 43 , four connecting rods 44 , four telescopic slides 45 and a quick pneumatic joint 432 .

[0042] Among them, the rotary cylinder 431 is arranged at the geometric center position of the positioning frame 41, the rotary cylinder 431 has a vertically arranged output shaft, the rotating seat 43 is fixedly connected to the output shaft of the rotary cylinder 431, one end of the four connecting rods 44 is hinged to the rotating seat 43, and the other end is respectively connected to four telescopic slides 45, each slide can be detachably connected to an internal support block 42 for touching the inner wall of the product, and is slidably connected to the frame body of the positioning frame 41, and the quick pneumatic joint 432 is arranged on the edge of the positioning frame 41, the quick pneumatic joint 432 includes a normally closed air inlet and air outlet, the air inlet and air outlet of the quick pneumatic joint 432 are connected to the air inlet and air outlet of the rotary cylinder 431, and the air inlet and air outlet of the quick pneumatic joint 432 are only opened when an external air source is connected.

[0043] When the external air source is connected to the quick pneumatic connector 432, the compressed air can directly drive the rotary cylinder 431 to work. When the external air source is disconnected, due to the normally closed characteristic of the quick pneumatic connector 432, the rotary cylinder 431 will be able to maintain its current working posture.

[0044] refer to Figure 9 、 Figure 10 Each telescopic slide 45 includes: a first slider 451, a spring 452 and a second slider 453. The inner support block 42 is connected to the first slider 451 by a bolt pair. The first slider 451 and the second slider 453 are slidably connected through a dovetail groove. The spring 452 is pre-placed between the first slider 451 and the second slider 453. The spring 452 is used to provide buffering and pre-tightening force. The second slider 453 is slidably connected to the frame body of the positioning frame 41 (the side slide groove of the aluminum alloy profile). One end of each connecting rod 44 is hinged to a second slider 453, so that the rotary cylinder 431, the rotating seat 43, the connecting rod 44 and the second slider 453 together constitute a set of crank-connecting rod 44 mechanisms.

[0045] The usage of the inner support assembly 4 of the second embodiment is as follows: When the external air source is connected through the quick connector, the rotary cylinder 431 is pneumatically activated, and its output shaft drives the rotating seat 43 to rotate. The rotation of the rotating seat 43 is transmitted to the corresponding second slider 453 through the four connecting rods 44, driving the second slider 453 along the guide rail of the pneumatic positioning frame 41 to approach or move away from the inner wall of the product. When the second slider 453 drives the first slider 451 and the inner support block 42 to approach the inner wall of the product, the end face of the inner support block 42 first contacts the inner wall of the product. As the second slider 453 continues to be driven and pushed, if the inner wall of the large thin-walled workpiece has formed an obstruction, the spring 452 begins to be compressed. At this time, the first slider 451 will undergo a buffering relative displacement relative to the second slider 453. This design of the telescopic slide 45 with spring 452 buffering allows the nylon block to fit the inner wall of the product in a flexible manner and exert appropriate supporting force, which can effectively resist deformation and avoid secondary damage that may be caused by excessive rigid pushing.

[0046] When the gas source is disconnected, the rotary cylinder 431 maintains its posture and the inner support block 42 continues to provide support. At this time, the gas pipeline is removed and does not affect the cutting work of the laser head.

[0047] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the spirit and scope of protection of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the embodiments of the present invention.

Claims

1. A laser processing fixture for large thin-walled workpieces that prevents deformation, characterized in that: include: Main frame (1), outer support assembly (2), clamping mechanism (3) and inner support assembly (4); The main frame (1) is used to connect the machine tool with the outer support assembly (2) and the clamping mechanism (3), thereby providing positioning and stable support for the outer support assembly (2) and the clamping mechanism (3); The outer support assembly (2) is arranged on the top of the main frame (1), and the outer support assembly (2) is used to directly support the outer wall and bottom wall of a large thin-walled workpiece; The clamping mechanism (3) is used to clamp the flange edge of the large thin-walled workpiece, thereby firmly connecting the large thin-walled workpiece and the outer support assembly (2); The inner support assembly (4) includes a positioning frame (41) that can be placed and removed independently, a lower support block (411) arranged at the bottom of the positioning frame (41), and inner support blocks (42) arranged on both sides of the length direction of the positioning frame (41), wherein the lower support block (411) contacts the bottom of the inner wall of the large thin-walled workpiece, and the inner support block (42) supports the inner wall side of the large thin-walled workpiece.

2. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 1, characterized in that: The outer support assembly (2) is added one at intervals of 400 mm to 600 mm, and at least two outer support assemblies (2) are arranged at each major corner of the large thin-walled workpiece for collaborative support.

3. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 2, characterized in that: The outer support assembly (2) comprises a first support rod (21) and an outer support block (22) connected to each other by bolts, the first support rod (21) is made of metal, the outer support block (22) is made of nylon, and the outer support block (22) directly supports the outer wall and bottom wall of a large thin-walled workpiece.

4. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 3, characterized in that: The clamping mechanism (3) comprises a second support rod (31), a static clamping jaw (32), a dynamic clamping jaw (33) and a clamping jaw driver (34); The second support rod (31) is made of metal, and the second support rod (31) connects the main frame (1) with the static clamp (32) and the clamp driver (34), thereby providing positioning and stable support for the clamp driver (34) and the static clamp (32); The static clamping jaw (32) is made of nylon, and the static clamping jaw (32) directly supports the edge of the large thin-walled workpiece. The contact surface shape of the static clamping jaw (32) is customized according to the actual curvature of the flange of the large thin-walled workpiece; The dynamic clamping jaw (33) is made of nylon. The dynamic clamping jaw (33) is fixedly connected to the execution part of the clamping jaw driver (34). The clamping jaw driver (34) is used to drive the dynamic clamping jaw (33) to approach or move away from the static clamping jaw (32).

5. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 4, characterized in that: The clamping jaw driver (34) is a lever cylinder, and a pneumatic switch handle (35) is provided on the main frame (1). The pneumatic switch handle (35) is connected to each of the lever cylinders via an air pipe.

6. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 4, characterized in that: The main frame (1) comprises a top plate (12) and a bottom plate (11); the first support rod (21) and the second support rod (31) are fixedly connected to the top plate (12); and the surfaces of the top plate (12), the first support rod (21) and the second support rod (31) are subjected to a blackening treatment.

7. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 6, characterized in that: A circle of light shielding plates (5) is provided along the contour of the large thin-walled workpiece, the surface of the light shielding plates (5) being blackened, and the light shielding plates (5) being provided at a position where the laser can directly illuminate or indirectly reflect the outer wall of the large thin-walled workpiece after penetrating the large thin-walled workpiece.

8. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 1, characterized in that: Two easy-to-grasp handles (412) are symmetrically mounted on the middle portion of the positioning frame (41).

9. A deformation-resistant laser processing fixture for large thin-walled workpieces according to claim 1 or 8, characterized in that: The inner support assembly (4) further includes: a rotary cylinder (431), a rotating seat (43), four connecting rods (44), four telescopic slides (45) and a quick pneumatic joint (432); The rotary cylinder (431) is arranged at the geometric center of the positioning frame (41), the rotary cylinder (431) has a vertically arranged output shaft, and the rotating seat (43) is fixedly connected to the output shaft of the rotary cylinder (431); One end of the four connecting rods (44) is hinged to the rotating seat (43), and the other end is connected to the four telescopic slides (45) respectively; Each slide is detachably connected to an inner support block (42) for contacting the inner wall of the product, and is slidably connected to the frame body of the positioning frame (41); The quick pneumatic connector (432) is arranged on the edge of the positioning frame (41), and the quick pneumatic connector (432) includes an air inlet and an air outlet of a normally closed design. The air inlet and the air outlet of the quick pneumatic connector (432) are connected to the air inlet and the air outlet of the rotary cylinder (431), and the air inlet and the air outlet of the quick pneumatic connector (432) are opened only when an external air source is connected.

10. The laser processing fixture for large thin-walled workpieces with deformation resistance according to claim 9, characterized in that: Each of the telescopic slides (45) includes: a first slider (451), a spring (452) and a second slider (453); the inner support block (42) is detachably connected to the first slider (451); the first slider (451) is slidably connected to the second slider (453); the spring (452) is arranged between the first slider (451) and the second slider (453); the spring (452) is used to provide buffering and pre-tightening force; the second slider (453) is slidably connected to the positioning frame (41); and one end of each connecting rod (44) is hinged to a second slider (453).

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