Clamping and fixing method for thin-walled open profile bending process

Abstract

The clamping and fixing method for the drawing and bending process of thin-walled open profiles is based on the tooling assembly for the drawing and bending process of thin-walled open profiles, which can provide good clamping and fixing support for the drawing and bending process of thin-walled open profiles; the tooling assembly for the drawing and bending process of thin-walled open profiles includes a clamping device, a flexible lining assembly and a side wall clamping assembly; the clamping and fixing method is as follows: S01, filling and wrapping the thin-walled open profile; S02, adjusting the clamping device to the initial state; S03, clamping and fixing the thin-walled open profile. The advantage of the present invention is that, through the cooperation of the flexible lining assembly and the side wall clamping assembly, the U-shaped groove of the thin-walled open profile is filled, the opening and flanging are wrapped, and the outer wall surface is compacted, thereby achieving three-dimensional and all-round protection, and effectively avoiding the deformation, wrinkling, and fracture of the thin-walled open profile during the drawing and bending process.

Description

Technical Field

[0001] The invention relates to the technical field of tooling fixtures, in particular to a clamping and fixing method for a thin-walled open profile in a bending process. Background Art

[0002] The front and rear collision beams of automobiles are a common open profile. During the processing, they need to be bent into a certain arc as a whole through a stretching and bending operation. Fig.10 On the one hand, the front and rear collision beams are usually made of aluminum alloy, which has good plasticity to meet the deformation requirements during the bending process. On the other hand, in order to meet the requirements of lightweight vehicles, the thickness of the front and rear collision beams is designed to be relatively thin, and the strength is improved by setting reinforcing ribs or boss structures.

[0003] Based on the above two factors, the front and rear collision beams have the following problems in the stretching and bending process: 1. The clamping position of the clamp used in the stretching and bending process is usually located at both ends of the profile. Due to the thin wall thickness of the profile, if the clamping force is too large, it is easy to collapse the profile, and if the clamping force is too small, the clamp head is easy to slip or even loosen during the stretching and bending process; 2. During the stretching and bending process, the profile will have a tendency to extrude and accumulate materials in the area close to the inner side of the arc, and the profile will have a tendency to stretch and extend materials in the area close to the outer side of the arc, which will cause the profile to have cross-sectional distortion and wrinkled edges after stretching and bending, seriously affecting the forming quality; and, as the degree of bending increases, the cross-sectional distortion and edge wrinkling become more serious, which seriously limits the bendability of the profile; 3. If there are material defects such as hidden cracks in the middle of the profile, stress concentration will occur at the material defect during the stretching and bending process, and there is a risk of sudden breakage of the profile and rebounding outward. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a method for clamping and fixing a thin-walled open profile in a bending process. The method is used for clamping and fixing a thin-walled open profile in a bending process, and solves the problems of inconvenient clamping, deformation and wrinkling, and the risk of breakage and external rebound of thin-walled open profiles during bending.

[0005] The technical solution of the present invention is: a clamping and fixing method for a thin-walled open profile in a bending process, based on a tooling assembly for a thin-walled open profile in a bending process, which can provide good clamping and fixing support for the thin-walled open profile in the bending process; the thin-walled open profile is provided with a U-shaped groove, one end of the U-shaped groove is closed and the other end is open, and the two edges of the opening are turned outward of the opening to form a flange;

[0006] A tooling assembly for a thin-walled open profile stretch-bending process, including a clamping device, a flexible lining assembly, and a side wall clamping assembly;

[0007] Two sets of chuck devices are used to clamp the two ends of the thin-walled open profile respectively; the chuck device includes a housing, a spring bolt, a connecting seat, a pressing block A, a pressing block B, a power shaft and an end lining block;

[0008] The outer shell is in the shape of a sleeve, and its inner hole wall surface is a conical surface. Both ends of the outer shell are respectively provided with a profile loading and unloading port and a power access port connected to the inner hole of the outer shell. Four waist-shaped holes connected to the inner hole of the outer shell are evenly distributed on its outer circumferential surface. The extension direction of the waist-shaped holes is parallel to the axial direction of the outer shell.

[0009] One side of the connection seat is provided with a convex arc surface for fitting the inner hole wall of the shell, and the other side of the connection seat is provided with a mounting surface and a plug-in portion A; four connection seats are evenly distributed in the inner hole of the shell in a ring shape and arranged in pairs opposite to each other;

[0010] One end of the spring bolt head is located outside the housing, and one end of the spring bolt rod passes through the waist-shaped hole on the housing and extends into the inner hole of the housing and is threadedly connected with the connecting seat; the spring bolt forces the convex arc surface of the connecting seat to be pressed against the wall surface of the inner hole of the housing through elastic force;

[0011] Two pressing blocks A are detachably connected to the mounting surfaces of two oppositely arranged connecting seats and are arranged oppositely; two pressing blocks B are detachably connected to the mounting surfaces of the other two oppositely arranged connecting seats and are arranged oppositely; the two pressing blocks A and the two pressing blocks B are surrounded by a receiving area, and the receiving area is directly connected to the profile loading and unloading port of the shell;

[0012] The power shaft is movably mounted on the power access port of the housing, with its front end extending outside the housing to receive external power, and its rear end extending into the inner cavity of the housing, and a plug-in portion B is provided at the rear end; the power shaft is movably plugged with the plug-in portions A of the four connecting seats through the plug-in portion B; the power shaft performs reciprocating linear motion along the axial direction of the housing under the drive of the external power, and then drives the four connecting seats to move synchronously along the inner hole wall of the housing through the plug-in structure of the plug-in portion B and the plug-in portion A, so as to expand or reduce the accommodation interval;

[0013] The end lining block is provided with two opposite side faces and an upper and lower end face provided between the two side faces. The end lining block is also provided with two slots penetrating the upper and lower end faces. Notches are respectively provided on both sides of the lower end face of the end lining block. The end lining block is movably installed in the accommodating interval. Its two side faces are clamped between the two pressing blocks A, and a gap is formed between its upper end face and the pressing block B. The two slots are respectively connected to the two sides of the gap at the upper end, and the two slots are respectively connected to a notch at the lower end, so that the gap, the slot and the notch are connected in sequence to form a clamping interval adapted to the shape of the thin-walled opening profile.

[0014] The flexible lining assembly is installed on the thin-walled opening profile and is located on the length section of the thin-walled opening profile between the two clamping devices; the flexible lining assembly includes a middle flexible inner lining and a middle opening outer lining;

[0015] The middle flexible lining is a strip-shaped component, which is movably installed in the U-shaped groove of the thin-walled open profile and adapted to the shape of the U-shaped groove of the thin-walled open profile; the surface of the middle flexible lining facing the bottom of the U-shaped groove is defined as surface A, the surface of the middle flexible lining facing the opening of the U-shaped groove is defined as surface B, and the surface of the middle flexible lining facing the two side walls of the U-shaped groove is defined as surface C; a plurality of auxiliary deformation grooves A are provided on the middle flexible lining at intervals along the length direction, and the auxiliary deformation grooves A extend from surface B to surface A and penetrate the two surfaces C;

[0016] The outer lining of the middle opening is a strip-shaped component, and an inner groove and an outer groove extending along the length direction and arranged in order from deep to shallow are provided on one side surface thereof, and the outer groove is provided outside the inner groove and contains the inner groove inside; the outer lining of the middle opening is movably plugged with the middle flexible inner lining through the inner groove on the one hand, and contains the opening of the thin-walled opening profile and two flanges inside through the outer groove on the other hand; the surface of the middle opening outer lining having the inner groove and the outer groove on one side is defined as surface D, the surface of the middle opening outer lining on one side opposite to surface D is defined as surface E, and the two side vertical surfaces of the middle opening outer lining provided between surface D and surface E and parallel to the length direction of the middle opening outer lining are defined as surface F; a plurality of auxiliary deformation grooves B are provided on the outer lining of the middle opening at intervals along the length direction, and the auxiliary deformation grooves B extend from surface D to surface E and penetrate the two surfaces F;

[0017] A plurality of side wall clamping assemblies are installed on the thin-walled opening profile at intervals along the length direction of the thin-walled opening profile and are located on the length section of the thin-walled opening profile between two clamping head devices; the side wall clamping assemblies include a locking pliers and pads respectively welded at two jaws of the locking pliers; the locking pliers are movably clamped on two opposite outer side walls of the thin-walled opening profile through the two pads;

[0018] The clamping and fixing methods are as follows:

[0019] S01, filling and sealing of thin-walled open profiles:

[0020] 1. Install the middle flexible lining in the U-shaped groove of the thin-walled open profile. After installation, the middle flexible lining is located in the middle section of the U-shaped groove, the surface A of the middle flexible lining is directly opposite to and fits with the bottom of the U-shaped groove, and the two surfaces C of the middle flexible lining are directly opposite to and fit with the two side walls of the U-shaped groove respectively;

[0021] 2. Install the middle opening outer lining at the opening of the U-shaped groove of the thin-walled opening profile, and ensure that it is opposite to the middle flexible inner lining. On the one hand, it is movably connected with the middle flexible inner lining through the inner groove, and on the other hand, it contains the opening and two flanges of the thin-walled opening profile through the outer groove, and on the other hand, it fits with the two flanges of the thin-walled opening profile through the step surface between the outer groove and the inner groove;

[0022] 3. Install the two end lining blocks at the two ends of the thin-walled open profile respectively, so as to fill the two ends of the U-shaped groove of the thin-walled open profile. After installation, the two side walls of the U-shaped groove of the thin-walled open profile pass through the two slots of the end lining blocks respectively, and the end lining blocks fill the U-shaped groove through the area between the two slots;

[0023] When this step is completed, the entire length of the U-shaped groove of the thin-walled open profile is filled with the middle flexible lining and the two end lining blocks;

[0024] S02, adjust the chuck device to the initial state:

[0025] 1. Connect the front ends of the power shafts of the two sets of chuck devices to the power output components of the stretch bending machine respectively, and control the movement of the power output components of the stretch bending machine so that the two sets of chuck devices are arranged opposite to each other and at the farthest distance from each other;

[0026] 2. Drive the power shaft to move along the axial direction of the housing, and then drive the four connecting seats to move synchronously along the inner hole wall of the housing through the matching relationship between the plug-in part B of the power shaft and the plug-in parts A of the four connecting seats, so as to expand the accommodation area to the limit;

[0027] In this step, the power output component of the stretch bending machine is used to drive the power shaft to move horizontally and linearly on the one hand, and to drive the chuck device to swing in a horizontal arc trajectory and / or move horizontally and / or move vertically on the other hand;

[0028] S03, clamping and fixing thin-walled open profiles:

[0029] 1. Lift the thin-walled open profile that has been filled and wrapped to a horizontal position, and make its two ends face the profile loading and unloading ports of the two chuck devices respectively;

[0030] 2. Control the power output component of the stretch bending machine to move the two sets of chuck devices to move horizontally and linearly toward each other, so that the two ends of the thin-walled open profile pass through the profile loading and unloading ports of the two chuck devices and extend into the accommodating intervals of the two chuck devices respectively;

[0031] 3. Control the power output component of the stretch bending machine to drive the power shaft to move along the axial direction of the shell, and then through the matching relationship between the plug-in part B of the power shaft and the plug-in part A of the four connecting seats, drive the four connecting seats to move synchronously along the inner hole wall of the shell, and reduce the accommodating interval until the end of the thin-walled open profile is clamped;

[0032] 4. Install multiple sets of side wall clamping assemblies on the thin-walled opening profile at intervals along the length direction of the thin-walled opening profile, specifically, adjust the pliers to a clamping state so that the pads connected to the two jaws of the pliers are pressed against the two opposite outer wall surfaces of the thin-walled opening profile;

[0033] When this step is completed, the thin-walled open profile is clamped by two chuck devices, and the two pressure blocks A respectively press the two side facades of the end liner block, the pressure block B at the upper end presses the closed end outer wall surface of the thin-walled open profile through its lower surface, and the pressure block B at the lower end presses the two flanges of the thin-walled open profile and the lower end surface of the end liner block through its upper surface.

[0034] A further technical solution of the present invention is: in step S03, the spacing between two groups of adjacent side wall clamping assemblies should take a minimum value under the premise of satisfying the following conditions; the condition is: during the bending process of the thin-walled open profile, the two groups of adjacent side wall clamping assemblies do not interfere with each other.

[0035] A further technical solution of the present invention is that two pressing blocks A are respectively provided with crisscross anti-skid patterns on surfaces arranged opposite to each other; and two pressing blocks B are respectively provided with crisscross anti-skid patterns on surfaces arranged opposite to each other.

[0036] A further technical solution of the present invention is that the notch depth of the end liner block is adapted to the flange thickness of the thin-walled open profile; when the thin-walled open profile is clamped in the clamping interval, the lower end surface of the end liner block is flush with the two flanges of the thin-walled open profile.

[0037] A further technical solution of the present invention is: the plug-in part A is a positioning hole arranged on the connecting seat, and the plug-in part B is a cylindrical boss arranged at the rear end of the power shaft, and the shape of the cylindrical boss is adapted to the shape of the positioning hole, thereby realizing the movable plug-in of the plug-in part A and the plug-in part B.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. It is used for clamping and fixing in the bending process of thin-walled open profiles. On the one hand, through the cooperation of the flexible lining assembly and the side wall clamping assembly, the U-shaped groove of the thin-walled open profile is filled, the opening and the flange are wrapped, and the outer wall surface is compacted, achieving three-dimensional and all-round protection, effectively avoiding deformation, wrinkling, and fracture of the thin-walled open profile during the bending process. On the other hand, the end lining block in the clamping head device effectively supports the inner wall of the thin-walled open profile, effectively avoiding the thin-walled open profile from being clamped and collapsed or shrunk under the action of the clamping force, so that the thin-walled open profile can withstand a relatively larger clamping force, and the clamping firmness is guaranteed.

[0040] 2. The process of clamping or removing the profile by the chuck device is simple and easy to operate. It only needs to drive the power shaft to make reciprocating linear motion along the axial direction of the shell to realize the synchronous movement of the four connecting seats, thereby realizing the clamping or loosening of the profile.

[0041] 3. The chuck device can be adapted to profiles with different cross-sectional shapes by replacing the pressing block A, pressing block B and the end lining block, so it has good versatility (universality).

[0042] 4. The end inner block in the chuck device is designed with slots and notches so that the profile can form a square whole with no steps on multiple walls after being connected to the end inner liner block. On the one hand, it is convenient for the pressure and clamping of the pressing block A and the pressing block B, and on the other hand, it also reduces the difficulty of the structural design of the pressing block A and the pressing block B.

[0043] 5. A plurality of auxiliary deformation grooves A are provided at intervals on the middle flexible inner lining of the flexible lining bag assembly, and a plurality of auxiliary deformation grooves B are provided at intervals on the middle outer lining of the bag mouth of the flexible lining bag assembly. Based on this design, when the profile is bent, the flexible lining bag assembly can fit the profile well and bend synchronously, which has a better supporting effect on the profile and is not prone to breakage or excessive bending that is difficult to recover.

[0044] The present invention is further described below in conjunction with the figures and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the structure of the tooling assembly for the thin-walled open profile stretch bending process;

[0046] Figure 2 An exploded view of the chuck device;

[0047] Figure 3 is an assembly drawing of the chuck device;

[0048] Figure 4 It is a schematic diagram of the structure of the end liner block in the clamping device;

[0049] Figure 5 This is an exploded view of the assembly of thin-walled opening profile and flexible lining package;

[0050] Figure 6 for Figure 5 A magnified view of part A;

[0051] Figure 7 It is a schematic diagram of the structure after the thin-walled opening profile and the flexible lining package component are assembled;

[0052] Figure 8 It is a schematic diagram of the structure of the side wall clamping assembly;

[0053] Fig. 9 It is a schematic diagram of the working state of the present invention;

[0054] Fig.10 Schematic diagram of the structure of thin-walled open profile after bending.

[0055] illustrate: Figure 3The shell in the figure is sectioned along the axial direction to show the assembly relationship of the various components inside the shell.

[0056] Legend: thin-walled open profile 1; U-shaped groove 11; flange 12; shell 21; profile loading and unloading port 211; power access port 212; connecting seat 22; convex arc surface 221; mounting surface 222; plug-in portion A223; spring bolt 23; pressure block A24; pressure block B25; power shaft 26; plug-in portion B261; end lining block 27; gap 270; slot 271; notch 272; middle flexible lining 31; auxiliary deformation groove A311; middle wrapping outer lining 32; inner groove 321; outer groove 322; auxiliary deformation groove B323; pliers 41; pad 42. DETAILED DESCRIPTION

[0057] Embodiment 1:

[0058] like Figure 1-9 As shown, the tooling assembly for the thin-walled open profile stretch-bending process includes a thin-walled open profile 1, a clamping head device, a flexible lining assembly and a side wall clamping assembly.

[0059] A U-shaped groove 11 is provided on the thin-walled open profile 1. One end of the U-shaped groove 11 is closed and the other end is open. Both edges of the opening are turned outward to form flanges 12.

[0060] The two sets of clamping devices are respectively used to clamp the two ends of the thin-walled open profile 1. The clamping device includes a housing 21, a connecting seat 22, a spring bolt 23, a pressing block A 24, a pressing block B 25, a power shaft 26 and an end lining block 27.

[0061] The outer shell 21 is in a sleeve shape, and its inner hole wall is a conical surface. Its two ends are respectively provided with a profile loading and unloading port 211 and a power access port 212 connected to the inner hole of the outer shell 21. Four waist-shaped holes 213 connected to the inner hole of the outer shell are evenly distributed on its outer circumferential surface. The extension direction of the waist-shaped holes 213 is parallel to the axial direction of the outer shell 21.

[0062] One side of the connection seat 22 is provided with a convex arc surface 221 for fitting the inner hole wall of the shell 21, and the other side of the connection seat 22 is provided with a mounting surface 222 and a plug-in portion A223. Four connection seats 22 are evenly distributed in the inner hole of the shell 21 in an annular shape and arranged in pairs.

[0063] One end of the head of the spring bolt 23 is located outside the housing 21, and one end of the rod of the spring bolt 23 passes through the waist-shaped hole 213 on the housing 21, and extends into the inner hole of the housing 21, and is threadedly connected with the connecting seat 22. The spring bolt 22 forces the convex arc surface 221 of the connecting seat 22 to be pressed against the wall surface of the inner hole of the housing 21 by elastic force. There are four spring bolts 23, and the four spring bolts 23 are threadedly connected with the four connecting seats 22 respectively.

[0064] The two pressing blocks A24 are detachably connected to the mounting surfaces 232 of two oppositely arranged connection seats 23 and are arranged oppositely. The two pressing blocks B25 are detachably connected to the mounting surfaces 232 of the other two oppositely arranged connection seats 23 and are arranged oppositely. The two pressing blocks A24 and the two pressing blocks B25 are enclosed to form a receiving area, and the receiving area is directly connected to the profile loading and unloading port 211 of the housing 21.

[0065] The power shaft 26 is movably mounted on the power access port 212 of the housing 21, with its front end extending outside the housing 21 to receive external power, and its rear end extending into the inner cavity of the housing 21, and a plug-in portion B261 is provided at the rear end. The power shaft 26 is movably plugged with the plug-in portions A223 of the four connecting seats 22 through the plug-in portion B261. Driven by external power, the power shaft 26 performs reciprocating linear motion along the axial direction of the housing 21, and then drives the four connecting seats 22 to move synchronously along the inner hole wall of the housing 21 through the plug-in structure of the plug-in portion B261 and the plug-in portion A223, so as to expand or reduce the accommodating interval.

[0066] The end lining block 27 is provided with two opposite side faces and upper and lower end faces between the two side faces. The end lining block 27 is also provided with two slots 271 penetrating the upper and lower end faces. Notches 272 are respectively provided on both sides of the lower end face of the end lining block 27. The end lining block 27 is movably installed in the accommodation area, and its two side faces are clamped between the two pressing blocks A24, and a gap 270 is formed between its upper end face and the pressing block B25. The two slots 271 are respectively connected to the two sides of the gap 270 at the upper end, and the two slots 271 are respectively connected to a notch 272 at the lower end, so that the gap 270, the slot 271, and the notch 272 are connected in sequence to form a clamping area adapted to the shape of the thin-walled open profile 1.

[0067] The flexible lining bag assembly is installed on the thin-walled open profile 1 and is located on the length section of the thin-walled open profile 1 between the two clamping devices. The flexible lining bag assembly includes a middle flexible inner liner 31 and a middle outer liner 32 of the opening.

[0068] The middle flexible lining 31 is a strip-shaped component, which is movably installed in the U-shaped groove 11 of the thin-walled open profile 1 and is adapted to the shape of the U-shaped groove 11 of the thin-walled open profile 1. The surface of the middle flexible lining 31 facing the bottom of the U-shaped groove 11 is defined as surface A, the surface of the middle flexible lining 31 facing the opening of the U-shaped groove 11 is defined as surface B, and the surface of the middle flexible lining 31 facing the two side walls of the U-shaped groove 11 is defined as surface C. A plurality of auxiliary deformation grooves A311 are provided on the middle flexible lining 31 at intervals along the length direction, and the auxiliary deformation grooves A311 extend from surface B to surface A and penetrate the two surfaces C.

[0069] The middle opening outer lining 32 is a strip-shaped component, and one side surface thereof is provided with an inner groove 321 and an outer groove 322 extending along the length direction and arranged in order from deep to shallow. The outer groove 322 is arranged outside the inner groove 321 and contains the inner groove 321. On the one hand, the middle opening outer lining 32 is movably connected with the middle flexible inner lining 31 through the inner groove 321, and on the other hand, the opening of the thin-walled opening profile 1 and the two flanges 12 are contained inside through the outer groove 322. The side surface of the middle opening outer lining 32 provided with the inner groove 321 and the outer groove 322 is defined as surface D, the side surface of the middle opening outer lining 32 opposite to the surface D is defined as surface E, and the two side vertical surfaces of the middle opening outer lining 32 provided between the surface D and the surface E and parallel to the length direction of the middle opening outer lining 32 are defined as surface F. A plurality of auxiliary deformation grooves B323 are provided on the middle opening outer lining 32 at intervals along the length direction. The auxiliary deformation grooves B323 extend from the surface D to the surface E and penetrate the two surfaces F.

[0070] Multiple sets of side wall clamping assemblies are installed on the thin-walled open profile 1 at intervals along the length direction of the thin-walled open profile 1, and are located on the length section of the thin-walled open profile 1 between the two clamping devices. The side wall clamping assembly includes a locking pliers 41 and pads 42 respectively welded at the two jaws of the locking pliers 41. The locking pliers 41 are movably clamped on the two opposite outer side walls of the thin-walled open profile 1 through the two pads 42.

[0071] Preferably, the plug-in portion A223 is a positioning hole provided on the connecting seat 22, and the plug-in portion B261 is a cylindrical boss provided at the rear end of the power shaft 26, and the shape of the cylindrical boss is adapted to the shape of the positioning hole, thereby realizing the movable plug-in between the plug-in portion A223 and the plug-in portion B261.

[0072] Preferably, the housing 21 is a two-section split structure, and the profile loading and unloading port 211 and the power access port 212 are respectively arranged on the two sections of the housing 21. Based on this structure, the assembly and disassembly of the internal components of the housing 21 are facilitated.

[0073] Preferably, the two pressing blocks A24 are respectively provided with criss-cross anti-slip patterns on their oppositely arranged surfaces.

[0074] Preferably, the two pressing blocks B25 are respectively provided with criss-cross anti-slip patterns on their oppositely arranged surfaces.

[0075] Preferably, the depth of the notch 272 of the end liner block 27 is adapted to the thickness of the flange 12 of the thin-walled open profile 1; when the thin-walled open profile 1 is clamped in the clamping interval, the lower end surface of the end liner block 27 is flush with the two flanges 12 of the thin-walled open profile 1.

[0076] The present invention is used for clamping and fixing in the bending process of thin-walled open profiles, and the clamping and fixing method is as follows:

[0077] S01, filling and sealing of thin-walled open profiles:

[0078] 1. Install the middle flexible lining 31 in the U-shaped groove 11 of the thin-walled open profile 1. After installation, the middle flexible lining 31 is located in the middle section of the U-shaped groove 11, and the surface A of the middle flexible lining 31 is directly opposite to and in contact with the bottom of the U-shaped groove 11, and the two surfaces C of the middle flexible lining 31 are directly opposite to and in contact with the two side walls of the U-shaped groove 11 respectively;

[0079] 2. Install the middle opening outer lining 32 at the opening of the U-shaped groove 11 of the thin-walled opening profile 1, and ensure that it is opposite to the middle flexible inner lining 31. On the one hand, it is movably connected with the middle flexible inner lining 31 through the inner groove 321, and on the other hand, it contains the opening and two flanges 12 of the thin-walled opening profile 1 through the outer groove 322. On the other hand, it fits with the two flanges 12 of the thin-walled opening profile 1 through the step surface between the outer groove 322 and the inner groove 321;

[0080] 3. Install the two end lining blocks 27 at the two ends of the thin-walled open profile 1 respectively, so as to fill the two ends of the U-shaped groove 11 of the thin-walled open profile 1. After installation, the two side walls of the U-shaped groove 11 of the thin-walled open profile 1 pass through the two slots 271 of the end lining block 27 respectively, and the end lining block 27 fills the U-shaped groove 11 through the area between the two slots 271.

[0081] When this step is completed, the entire length of the U-shaped groove 11 of the thin-walled open profile 1 is filled with the middle flexible liner 31 and the two end liner blocks 27 .

[0082] S02, adjust the chuck device to the initial state:

[0083] 1. Connect the front ends of the power shafts 26 of the two sets of chuck devices to the power output components of the drawing and bending machine respectively, and control the power output components of the drawing and bending machine to operate so that the two sets of chuck devices are arranged opposite to each other and at the farthest distance from each other;

[0084] 2. Drive the power shaft 26 to move along the axial direction of the housing 21, and then drive the four connecting seats 22 to move synchronously along the inner hole wall of the housing 21 through the matching relationship between the plug-in portion B261 of the power shaft 26 and the plug-in portions A223 of the four connecting seats 22, so as to expand the accommodating space to the limit;

[0085] In this step, the power output component of the stretch bending machine is used to drive the power shaft 26 to move horizontally and linearly on the one hand, and to drive the clamping device to swing in a horizontal arc trajectory and / or move horizontally and / or move vertically on the other hand.

[0086] S03, clamping and fixing thin-walled open profiles:

[0087] 1. The thin-walled open profile 1 that has been filled and sealed is hoisted to a horizontal position, and its two ends are respectively facing the profile loading and unloading ports 211 of the two clamping devices;

[0088] 2. Control the power output component of the stretch bending machine to move, so that the two sets of chuck devices move horizontally and linearly toward each other, so that the two ends of the thin-walled open profile pass through the profile loading and unloading ports 211 of the two chuck devices and extend into the accommodating intervals of the two chuck devices respectively;

[0089] 3. Control the power output component of the stretch bending machine to drive the power shaft to move along the axial direction of the housing 21, and then drive the four connecting seats 22 to move synchronously along the inner hole wall of the housing 21 through the matching relationship between the plug-in portion B261 of the power shaft 26 and the plug-in portions A223 of the four connecting seats 22, so as to reduce the accommodating interval until the end of the thin-walled open profile 1 is clamped;

[0090] 4. Install multiple sets of side wall clamping assemblies on the thin-walled opening profile 1 at intervals along the length direction of the thin-walled opening profile 1. Specifically, adjust the pliers 41 to a clamping state so that the pads 42 connected to the two jaws of the pliers 41 are pressed against the two opposite outer wall surfaces of the thin-walled opening profile 1.

[0091] In this step, the spacing between two adjacent sets of side wall clamping components should take the minimum value under the premise of satisfying the following conditions; the condition is: during the bending process of the thin-walled open profile 1, the two adjacent sets of side wall clamping components do not interfere with each other.

[0092] When this step is completed, the thin-walled open profile 1 is clamped by two chuck devices, and the two pressure blocks A respectively press the two side facades of the end liner block, and the pressure block B25 located at the upper end presses the closed end outer wall surface of the thin-walled open profile through its lower surface, and the pressure block B25 located at the lower end presses the two flanges 12 of the thin-walled open profile 1 and the lower end surface of the end liner block 27 through its upper surface.

Claims

1. A clamping and fixing method for a thin-walled open profile in a bending process, based on a tooling assembly for a thin-walled open profile in a bending process, can provide good clamping and fixing support for the thin-walled open profile in a bending process; the thin-walled open profile is provided with a U-shaped groove, one end of the U-shaped groove is closed and the other end is open, and the two edges of the opening are turned outward to form a flange; Its characteristics are: A tooling assembly for a thin-walled open profile stretch-bending process, including a clamping device, a flexible lining assembly, and a side wall clamping assembly; Two sets of chuck devices are used to clamp the two ends of the thin-walled open profile respectively; the chuck device includes a housing, a spring bolt, a connecting seat, a pressing block A, a pressing block B, a power shaft and an end lining block; The outer shell is in the shape of a sleeve, and its inner hole wall surface is a conical surface. Both ends of the outer shell are respectively provided with a profile loading and unloading port and a power access port connected to the inner hole of the outer shell. Four waist-shaped holes connected to the inner hole of the outer shell are evenly distributed on its outer circumferential surface. The extension direction of the waist-shaped holes is parallel to the axial direction of the outer shell. One side of the connection seat is provided with a convex arc surface for fitting the inner hole wall of the shell, and the other side of the connection seat is provided with a mounting surface and a plug-in portion A; four connection seats are evenly distributed in the inner hole of the shell in a ring shape and arranged in pairs opposite to each other; One end of the spring bolt head is located outside the housing, and one end of the spring bolt rod passes through the waist-shaped hole on the housing and extends into the inner hole of the housing and is threadedly connected with the connecting seat; the spring bolt forces the convex arc surface of the connecting seat to be pressed against the wall surface of the inner hole of the housing through elastic force; Two pressing blocks A are detachably connected to the mounting surfaces of two oppositely arranged connecting seats and are arranged oppositely; two pressing blocks B are detachably connected to the mounting surfaces of the other two oppositely arranged connecting seats and are arranged oppositely; the two pressing blocks A and the two pressing blocks B are surrounded by a receiving area, and the receiving area is directly connected to the profile loading and unloading port of the shell; The power shaft is movably mounted on the power access port of the housing, with its front end extending outside the housing to receive external power, and its rear end extending into the inner cavity of the housing, and a plug-in portion B is provided at the rear end; the power shaft is movably plugged with the plug-in portions A of the four connecting seats through the plug-in portion B; the power shaft performs reciprocating linear motion along the axial direction of the housing under the drive of the external power, and then drives the four connecting seats to move synchronously along the inner hole wall of the housing through the plug-in structure of the plug-in portion B and the plug-in portion A, so as to expand or reduce the accommodation interval; The end lining block is provided with two opposite side faces and an upper and lower end face provided between the two side faces. The end lining block is also provided with two slots penetrating the upper and lower end faces. Notches are respectively provided on both sides of the lower end face of the end lining block. The end lining block is movably installed in the accommodating interval. Its two side faces are clamped between the two pressing blocks A, and a gap is formed between its upper end face and the pressing block B. The two slots are respectively connected to the two sides of the gap at the upper end, and the two slots are respectively connected to a notch at the lower end, so that the gap, the slot and the notch are connected in sequence to form a clamping interval adapted to the shape of the thin-walled opening profile. The flexible lining assembly is installed on the thin-walled opening profile and is located on the length section of the thin-walled opening profile between the two clamping devices; the flexible lining assembly includes a middle flexible inner lining and a middle opening outer lining; The middle flexible lining is a strip-shaped component, which is movably installed in the U-shaped groove of the thin-walled open profile and adapted to the shape of the U-shaped groove of the thin-walled open profile; the surface of the middle flexible lining facing the bottom of the U-shaped groove is defined as surface A, the surface of the middle flexible lining facing the opening of the U-shaped groove is defined as surface B, and the surface of the middle flexible lining facing the two side walls of the U-shaped groove is defined as surface C; a plurality of auxiliary deformation grooves A are provided on the middle flexible lining at intervals along the length direction, and the auxiliary deformation grooves A extend from surface B to surface A and penetrate the two surfaces C; The outer lining of the middle opening is a strip-shaped component, and an inner groove and an outer groove extending along the length direction and arranged in order from deep to shallow are provided on one side surface thereof, and the outer groove is provided outside the inner groove and contains the inner groove inside; the outer lining of the middle opening is movably plugged with the middle flexible inner lining through the inner groove on the one hand, and contains the opening of the thin-walled opening profile and two flanges inside through the outer groove on the other hand; the surface of the middle opening outer lining having the inner groove and the outer groove on one side is defined as surface D, the surface of the middle opening outer lining on one side opposite to surface D is defined as surface E, and the two side vertical surfaces of the middle opening outer lining provided between surface D and surface E and parallel to the length direction of the middle opening outer lining are defined as surface F; a plurality of auxiliary deformation grooves B are provided on the outer lining of the middle opening at intervals along the length direction, and the auxiliary deformation grooves B extend from surface D to surface E and penetrate the two surfaces F; A plurality of side wall clamping assemblies are installed on the thin-walled opening profile at intervals along the length direction of the thin-walled opening profile and are located on the length section of the thin-walled opening profile between two clamping head devices; the side wall clamping assemblies include a locking pliers and pads respectively welded at two jaws of the locking pliers; the locking pliers are movably clamped on two opposite outer side walls of the thin-walled opening profile through the two pads; The clamping and fixing methods are as follows: S01, filling and sealing of thin-walled open profiles:

1. Install the middle flexible lining in the U-shaped groove of the thin-walled open profile. After installation, the middle flexible lining is located in the middle section of the U-shaped groove, the surface A of the middle flexible lining is directly opposite to and fits with the bottom of the U-shaped groove, and the two surfaces C of the middle flexible lining are directly opposite to and fit with the two side walls of the U-shaped groove respectively; 2. Install the middle opening outer lining at the opening of the U-shaped groove of the thin-walled opening profile, and ensure that it is opposite to the middle flexible inner lining. On the one hand, it is movably connected with the middle flexible inner lining through the inner groove, and on the other hand, it contains the opening and two flanges of the thin-walled opening profile through the outer groove, and on the other hand, it fits with the two flanges of the thin-walled opening profile through the step surface between the outer groove and the inner groove; 3. Install the two end lining blocks at the two ends of the thin-walled open profile respectively, so as to fill the two ends of the U-shaped groove of the thin-walled open profile. After installation, the two side walls of the U-shaped groove of the thin-walled open profile pass through the two slots of the end lining blocks respectively, and the end lining blocks fill the U-shaped groove through the area between the two slots; When this step is completed, the entire length of the U-shaped groove of the thin-walled open profile is filled with the middle flexible lining and the two end lining blocks; S02, adjust the chuck device to the initial state:

1. Connect the front ends of the power shafts of the two sets of chuck devices to the power output components of the stretch bending machine respectively, and control the movement of the power output components of the stretch bending machine so that the two sets of chuck devices are arranged opposite to each other and at the farthest distance from each other; 2. Drive the power shaft to move along the axial direction of the housing, and then drive the four connecting seats to move synchronously along the inner hole wall of the housing through the matching relationship between the plug-in part B of the power shaft and the plug-in parts A of the four connecting seats, so as to expand the accommodation area to the limit; In this step, the power output component of the stretch bending machine is used to drive the power shaft to move horizontally and linearly on the one hand, and to drive the chuck device to swing in a horizontal arc trajectory and / or move horizontally and / or move vertically on the other hand; S03, clamping and fixing thin-walled open profiles:

1. Lift the thin-walled open profile that has been filled and wrapped to a horizontal position, and make its two ends face the profile loading and unloading ports of the two chuck devices respectively; 2. Control the power output component of the stretch bending machine to move the two sets of chuck devices to move horizontally and linearly toward each other, so that the two ends of the thin-walled open profile pass through the profile loading and unloading ports of the two chuck devices and extend into the accommodating intervals of the two chuck devices respectively; 3. Control the power output component of the stretch bending machine to drive the power shaft to move along the axial direction of the shell, and then through the matching relationship between the plug-in part B of the power shaft and the plug-in part A of the four connecting seats, drive the four connecting seats to move synchronously along the inner hole wall of the shell, and reduce the accommodating interval until the end of the thin-walled open profile is clamped; 4. Install multiple sets of side wall clamping assemblies on the thin-walled opening profile at intervals along the length direction of the thin-walled opening profile, specifically, adjust the pliers to a clamping state so that the pads connected to the two jaws of the pliers are pressed against the two opposite outer wall surfaces of the thin-walled opening profile; When this step is completed, the thin-walled open profile is clamped by two chuck devices, and the two pressure blocks A respectively press the two side facades of the end liner block, the pressure block B at the upper end presses the closed end outer wall surface of the thin-walled open profile through its lower surface, and the pressure block B at the lower end presses the two flanges of the thin-walled open profile and the lower end surface of the end liner block through its upper surface.

2. The method for clamping and fixing thin-walled open profiles in a bending process according to claim 1, Its characteristics are: In step S03, the spacing between two adjacent sets of side wall clamping assemblies should take the minimum value under the premise of satisfying the following conditions; the condition is: during the bending process of the thin-walled open profile, the two adjacent sets of side wall clamping assemblies do not interfere with each other.

3. The method for clamping and fixing thin-walled open profiles in a bending process as claimed in claim 2, Its characteristics are: The two pressing blocks A are respectively provided with crisscross anti-skid patterns on surfaces arranged opposite to each other; the two pressing blocks B are respectively provided with crisscross anti-skid patterns on surfaces arranged opposite to each other.

4. The method for clamping and fixing thin-walled open profiles in a bending process according to claim 3, Its characteristics are: The notch depth of the end lining block is adapted to the flange thickness of the thin-walled open profile; when the thin-walled open profile is clamped in the clamping interval, the lower end surface of the end lining block is flush with the two flanges of the thin-walled open profile.

5. The clamping and fixing method for the thin-walled open profile bending process according to claim 3 or 4, Its characteristics are: The plug-in part A is a positioning hole arranged on the connecting seat, and the plug-in part B is a cylindrical boss arranged at the rear end of the power shaft. The shape of the cylindrical boss is adapted to the shape of the positioning hole, thereby realizing the movable plug-in of the plug-in part A and the plug-in part B.

Images