CN114789210A - Clamping and fixing method for drawing and bending process of thin-walled open profiles - Google Patents

Abstract

The clamping and fixing method for the stretch bending process of the thin-wall open profile is based on a tool assembly for the stretch bending process of the thin-wall open profile, and can provide good clamping and fixing support for the stretch bending process of the thin-wall open profile; the thin-wall open section stretch bending process tool assembly comprises a chuck device, a flexible liner package component and a side wall clamping component; the clamping and fixing method comprises the following steps: s01, filling and covering the thin-wall opening section; s02, adjusting the chuck device to an initial state; and S03, clamping and fixing the thin-wall open section. The invention has the advantages that the U-shaped groove of the thin-wall opening section is filled, the opening and the flanging are carried out for wrapping the opening and the outer side wall surface are compacted through the matching of the flexible lining package component and the side wall clamping component, thereby realizing the three-dimensional and all-directional protection and effectively avoiding the problems of deformation, wrinkling, fracture and the like of the thin-wall opening section in the stretch bending process.

Description

Clamping and fixing method for drawing and bending process of thin-walled open profiles

technical field

The invention relates to the technical field of tooling and fixtures, in particular to a clamping and fixing method in the drawing and bending process of thin-walled open profiles.

Background technique

The front and rear collision beam of an automobile is a common open profile, which needs to undergo a stretch-bending operation to be bent into a certain radian as a whole during the processing process. The state after the stretch-bending operation is shown in Figure 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 stretching and bending process. On the other hand, in order to meet the requirements of lightweight automobiles, the thickness of the front and rear collision beams is relatively thin. , and improve the strength by setting stiffeners or boss structures.

Based on the above two factors, the front and rear collision beams have the following problems in the drawing and bending: 1. The clamping positions of the clamps used in the drawing and bending process are usually located at both ends of the profile. Due to the thin wall thickness of the profile, the clamping force is too large. It is easy to collapse the profile clamp, and if the clamping force is too small, the clamp will easily slip or even loosen during the bending process; 2. During the bending process, the material will be squeezed and accumulated in the area near the inner side of the arc. In the area near the outer side of the arc, the profile will have a tendency to stretch and extend the material, which will lead to the section distortion and wrinkling of the edge after the profile is stretched and bent, which seriously affects the forming quality; and, with the increase of the bending degree. Large, the cross-section distortion and edge wrinkling become more and 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, during the bending process, stress concentration will occur at the material defects, and there are There is a danger that the profile suddenly breaks and bounces outwards.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a clamping and fixing method for the drawing and bending process of thin-walled open profiles, which is used for the clamping and fixing of the drawing and bending process of thin-walled open profiles, and solves the problem of There are problems of inconvenient clamping, deformation and wrinkling, and the risk of breakage and bounce during bending.

The technical scheme of the present invention is: a clamping and fixing method for the drawing and bending process of thin-walled open profiles. Based on the tooling assembly for the drawing and bending process of thin-walled open profiles, it can provide good clamping and fixing support for performing the drawing and bending process of thin-walled open profiles. The thin-walled opening profile is provided with a U-shaped groove, one end of the U-shaped groove is closed, the other end is open, and the two edges of the opening are turned to the outside of the opening to form a flanging;

A thin-walled open profile drawing and bending process tooling assembly, including a collet device, a flexible lining package assembly and a side wall clamping assembly;

Two sets of collet devices are respectively used to clamp both ends of thin-walled open profiles; the collet device includes shell, spring bolt, connecting seat, pressure block A, pressure block B, power shaft and end lining block;

The casing is sleeve-shaped, and its inner hole wall is a conical surface. The two ends of the casing are respectively provided with a profile loading and unloading port and a power inlet that communicate with the inner hole of the casing. The waist-shaped hole of the hole, the extension direction of the waist-shaped hole is parallel to the axial direction of the shell;

One side of the connection seat is provided with a convex arc surface for fitting the wall surface of the inner hole of the casing, and the other side of the connection seat is provided with a mounting surface and a plug-in part A; the four connection seats are uniformly distributed in the inner hole of the outer casing in two shapes. two opposite arrangements;

One end of the head of the spring bolt is located outside the casing, and one end of the stem of the spring bolt passes through the waist-shaped hole on the casing, extends into the inner hole of the casing, and is threadedly connected with the connecting seat; the spring bolt forces the convex arc surface of the connecting seat to press through the elastic force. tightly on the wall of the inner hole of the shell;

The two pressing blocks A are detachably connected to the mounting surfaces of the two oppositely arranged connecting seats, and are arranged oppositely; the two pressing blocks B are detachably connected to the mounting surfaces of the other two oppositely arranged connecting seats, and are opposite to each other. Arrangement; two pressing blocks A and two pressing blocks B are enclosed to form a accommodating area, and the accommodating area is directly connected with the profile loading and unloading port of the shell;

The power shaft is movably installed on the power inlet of the casing, its front end protrudes outside the casing to receive external power, its rear end extends into the inner cavity of the casing, and its rear end is provided with a plug-in part B; the power shaft passes through the plug-in part B is movably plugged with the plug parts A of the four connection bases; the power shaft reciprocates linearly along the axial direction of the casing under the drive of external power, and then drives the four plug parts through the plug structure of the plug parts B and A Each connecting seat moves synchronously along the inner hole wall of the shell to expand or shrink the accommodation area;

The end lining block is provided with two opposite side elevations and upper and lower end faces arranged between the two side elevations, and the end lining block is also provided with two slots penetrating the upper and lower end faces , there are gaps on both sides of the lower end face of the end lining block; the end lining block is movably installed in the accommodating area, and its two side elevations are clamped between the two pressing blocks A, and its upper end face and A gap is formed between the pressing blocks B; the two slots are connected to both sides of the gap at the upper end, respectively, and the two slots are connected to a gap at the lower end, so that the gap, the slot, and the gap are connected in turn to form a thin-walled opening. The clamping interval suitable for the shape of the profile;

The flexible lining package assembly is installed on the thin-walled opening profile, and is located on the length of the thin-walled opening profile between the two chuck devices; the flexible lining package assembly includes a middle flexible inner lining and a middle opening outer lining;

The middle flexible lining is a strip-shaped member, which is movably installed in the U-shaped groove of the thin-walled opening profile, and is adapted to the shape of the U-shaped groove of the thin-walled opening profile; it is defined that the middle flexible lining is opposite to the bottom of the U-shaped groove. The side surface of the middle flexible lining is defined as face A, the side surface of the middle flexible lining facing the opening of the U-shaped groove is defined as face B, and the surface of the middle flexible lining facing the two side walls of the U-shaped groove is defined as face C; A plurality of auxiliary deformation grooves A are arranged at intervals along the length direction, and the auxiliary deformation grooves A extend from the surface B to the surface A, and pass through the two surfaces C;

The outer lining of the middle bag mouth is a strip-shaped member, and its one side surface is provided with an inner groove and an outer groove extending along the length direction and the groove depth is arranged in sequence from deep to shallow, and the outer groove is provided outside the inner groove and contains the inner groove. Inside; the outer lining of the middle bag mouth is movably plugged with the middle flexible inner lining through the inner groove on the one hand, and the opening of the thin-walled open profile and the two flanges are contained by the outer groove on the other hand; the outer lining of the middle bag mouth is defined with inner grooves and The surface of one side of the outer groove is surface D, and the surface of the side opposite to the surface D is defined as the surface E, and the outer lining of the middle opening is defined as being arranged between the surface D and the surface E and parallel to the length direction of the outer lining of the middle opening The two side elevations of the side are face F; the outer lining of the middle bag mouth is provided with a plurality of auxiliary deformation grooves B at intervals along the length direction, and the auxiliary deformation grooves B extend from the face D to the face E, and pass through the two faces F;

A plurality of groups of side wall clamping components are installed on the thin-walled opening profiles at intervals along the length direction of the thin-walled opening profiles, and are located on the length of the thin-walled opening profiles between the two clamping devices; the side wall clamping components include a large force pliers and spacers welded at the two jaws of the pliers respectively; the pliers are movably clamped on the opposite outer side walls of the thin-walled opening profile through the two spacers;

The clamping method is as follows:

S01, filling and wrapping thin-walled opening profiles:

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

2. Install the outer lining of the middle bag opening at the opening of the U-shaped groove of the thin-walled opening profile, and ensure that it is opposite to the position of the middle flexible lining. On the one hand, it is movably inserted into the middle flexible lining through the inner groove, and on the other hand The opening of the thin-walled open profile and the two flanges are contained by the outer groove, and on the other hand, it is attached to the two flanges of the thin-walled open profile through the stepped surface between the outer groove and the inner groove;

3. Install the two end lining blocks on both ends of the thin-walled open profile, so as to fill both ends of the U-shaped groove of the thin-walled open profile. After the installation is in place, the two sides of the U-shaped groove of the thin-walled open profile The wall passes through the two slots of the end lining block respectively, and the end lining block fills the U-shaped groove through the area between the two slots;

When this step is completed, the full 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 collet devices to the power output parts of the stretch bender respectively, and control the action of the power output parts of the stretch bender, so that the two sets of collet devices are arranged in front of each other and at the most distance from each other. far distance;

2. Drive the power shaft to move in the axial direction of the casing, and then drive the four connecting bases to move synchronously along the inner hole wall of the casing through the mating relationship between the plug-in part B of the power shaft and the plug-in parts A of the four connection bases, which will accommodate The interval is expanded to the limit;

In this step, on the one hand, the power output part of the stretch bender is used to drive the power shaft to move horizontally and linearly, and on the other hand, it is used to drive the chuck device to perform horizontal arc trajectory swing and/or horizontal straight movement and/or vertical straight line move;

S03, clamping and fixing thin-walled opening profiles:

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

2. Control the action of the power output part of the stretch-bender, so that the two sets of collet devices move horizontally and straightly, so that the two ends of the thin-walled open profiles extend into the two clips through the profile loading and unloading ports of the two collet devices respectively. in the accommodating area of the head device;

3. Control the action of the power output component of the stretch bender, drive the power shaft to move in the axial direction of the casing, and then drive the four connecting seats 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 Move synchronously along the wall of the inner hole of the shell to reduce the accommodating area until the end of the thin-walled opening profile is clamped;

4. Install multiple sets of side wall clamping components on the thin-walled open profile at intervals along the length direction of the thin-walled open profile, specifically, adjust the forceps to the clamping state, so that the clamps connected to the two jaws of the forceps The spacer is pressed against the two opposite outer side walls of the thin-walled opening profile;

When this step is completed, the thin-walled open profile is jointly clamped by the two clamping devices, the two pressing blocks A press the two side elevations of the end lining block respectively, and the pressing block B at the upper end is pressed by its lower surface Tighten the outer wall surface of the closed end of the thin-walled open profile, and the pressing block B at the lower end presses the two flanges of the thin-walled open profile and the lower end surface of the end lining block through its upper surface.

A further technical solution of the present invention is: in step S03, the distance between two groups of adjacent side wall clamping components should be the minimum value under the premise of satisfying the following conditions; During the bending process, the two adjacent side wall clamping assemblies do not interfere.

A further technical solution of the present invention is that: the two pressing blocks A are respectively provided with crisscross anti-skid lines on the oppositely arranged surfaces;

A further technical solution of the present invention is: the notch depth of the end lining block is adapted to the flanging thickness of the thin-walled open section; when the thin-walled open section is clamped in the clamping area, the lower part of the end lining The end faces are flush with the two flanges of the thin-walled open profile.

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 set at the rear end of the power shaft, and the shape of the cylindrical boss is the same as that of the positioning hole. The shape of the socket is adapted to the shape of the socket, so as to realize the movable plug connection of the plug-in part A and the plug-in part B.

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

1. It is used for clamping and fixing in the drawing and bending process of thin-walled open profiles. On the one hand, through the cooperation of the flexible lining package component and the side wall clamping component, the U-shaped groove of the thin-walled opening profile is filled, the opening and flanging are packaged, and the outer side wall surface is compacted, so as to realize the three-dimensional and all-round protection. It effectively avoids the problems of deformation, wrinkling and breakage of thin-walled open profiles during the stretching and bending process. On the other hand, the inner wall of the thin-walled open profile is effectively foiled by the end lining block in the chuck device, which effectively prevents the thin-walled open profile from being clamped or collapsed under the action of the clamping force, making the thin-walled open profile The open profile can withstand relatively larger clamping forces, and the clamping firmness is guaranteed.

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

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

4. The end inner block in the collet device is designed with slots and gaps, so that the profile can be connected to the end lining block to form a square whole with multiple walls and no steps. On the one hand, it is convenient for pressing block A and pressing The block B is pressed and clamped, and on the other hand, the structural design difficulty of the pressure block A and the pressure block B is also reduced.

5. A plurality of auxiliary deformation grooves A are arranged at intervals on the middle flexible inner lining of the flexible lining bag assembly, and a plurality of auxiliary deformation grooves B are arranged at intervals on the outer lining of the middle bag mouth in the flexible lining bag assembly. Based on this design, when the profile is When bending, the flexible lining package assembly can well fit the synchronous bending of the profile, and has a good foiling effect on the profile, and is not prone to breakage and excessive bending that is difficult to restore.

The present invention will be further described below with reference to figures and embodiments.

Description of drawings

Fig. 1 is the structural schematic diagram of the tooling assembly in the drawing and bending process of thin-walled open profiles;

Figure 2 is an exploded view of the chuck device;

Fig. 3 is the assembly drawing of the collet device;

Fig. 4 is the structural schematic diagram of the end lining block in the chuck device;

Figure 5 is an exploded view of the thin-walled opening profile and the flexible lining package assembly after assembly;

Fig. 6 is the enlarged view of A part of Fig. 5;

7 is a schematic structural diagram of the thin-walled opening profile and the flexible lining package assembly after assembly;

8 is a schematic structural diagram of a side wall clamping assembly;

Fig. 9 is the working state schematic diagram of the present invention;

Fig. 10 is a schematic diagram of the structure of the thin-walled open profile after being stretched and bent.

Description: The housing in Fig. 3 is cut along the axial direction in order to show the assembly relationship of the components inside the housing.

Legend description: thin-walled open profile 1; U-shaped groove 11; flange 12; shell 21; profile loading and unloading port 211; Spring bolt 23; pressure block A24; pressure block B25; power shaft 26; insertion part B261; end lining block 27; gap 270; slot 271; Outer lining 32; inner groove 321; outer groove 322; auxiliary deformation groove B323;

Detailed ways

Example 1:

As shown in Figures 1-9, the tooling assembly for the thin-walled open profile drawing and bending process includes the thin-walled open profile 1, a collet device, a flexible lining package assembly and a side wall clamping assembly.

The thin-walled open profile 1 is provided with a U-shaped groove 11 , one end of the U-shaped groove 11 is closed, and the other end is open, and the two edges of the opening are turned to the outside of the opening to form a flange 12 .

The two sets of clamping devices are respectively used to clamp both ends of the thin-walled opening profile 1 . The collet device includes a housing 21 , a connecting seat 22 , a spring bolt 23 , a pressing block A24 , a pressing block B25 , a power shaft 26 and an end lining block 27 .

The outer casing 21 is in the shape of a sleeve, and its inner hole wall is a conical surface. The two ends of the outer casing 21 are respectively provided with a profile loading and unloading port 211 and a power inlet 212 which are connected to the inner hole of the outer casing 21. The waist-shaped hole 213 communicates with the inner hole of the casing, and the extending direction of the waist-shaped hole 213 is parallel to the axial direction of the casing 21 .

One side of the connecting seat 22 is provided with a convex arc surface 221 for fitting with the wall surface of the inner hole of the housing 21 , and the other side of the connecting seat 22 is provided with a mounting surface 222 and a plug portion A223 . The four connecting seats 22 are uniformly distributed in the inner hole of the casing 21 in a ring shape, and are arranged opposite to each other.

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

The two pressing blocks A24 are detachably connected to the mounting surfaces 232 of the two oppositely arranged connection bases 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 bases 23, and are arranged oppositely. The two pressing blocks A24 and the two pressing blocks B25 are enclosed to form a accommodating area, and the accommodating area is in direct communication with the profile loading and unloading port 211 of the housing 21 .

The power shaft 26 is movably installed on the power inlet 212 of the housing 21, its front end protrudes outside the housing 21 to receive external power, its rear end extends into the inner cavity of the housing 21, and its rear end is provided with a plug portion B261. The power shaft 26 is movably plugged into the plug parts A223 of the four connection bases 22 through the plug parts B261. Driven by external power, the power shaft 26 reciprocates linearly along the axial direction of the casing 21, and then drives the four connecting seats 22 to move synchronously along the inner hole wall of the casing 21 through the plug-in structure of the plug-in part B261 and the plug-in part A223. to expand or shrink the containment area.

The end lining block 27 is provided with two opposite side elevations and upper and lower end faces arranged between the two side elevations, and the end lining block 27 is also provided with two penetrating upper and lower end faces. In the slot 271 , notches 272 are respectively provided on both sides of the lower end surface of the end lining block 27 . The end lining block 27 is movably installed in the accommodating area, its two side elevations 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 both sides of the gap 270 at the upper end, and the two slots 271 are respectively connected to a gap 272 at the lower end, so that the gap 270, the slot 271 and the gap 272 are connected in turn to form a thin-walled opening profile. 1 The shape-appropriate clamping section.

The flexible liner pack assembly is mounted on the thin-walled opening profile 1 and is located on the length of the thin-walled opening profile 1 between the two collet devices. The flexible lining bag assembly includes a middle flexible inner lining 31 and a middle bag mouth outer lining 32 .

The middle flexible inner lining 31 is a strip-shaped member, 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 side surface of the middle flexible lining 31 facing the bottom of the U-shaped groove 11 is defined as face A, the side surface of the middle flexible lining 31 facing the opening of the U-shaped groove 11 is defined as face B, and the middle flexible lining 31 is defined as facing The surfaces of the two side walls of the U-shaped groove 11 are surfaces C. A plurality of auxiliary deformation grooves A311 are arranged on the middle flexible inner liner 31 at intervals along the length direction. The auxiliary deformation grooves A311 extend from the surface B to the surface A, and pass through the two surfaces C.

The outer lining 32 of the middle bag mouth is a strip-shaped member, and its one side surface is provided with an inner groove 321 and an outer groove 322 extending along the length direction and the groove depth is sequentially arranged from deep to shallow. The inner groove 321 is accommodated therein. On the one hand, the outer lining 32 of the middle bag mouth is movably plugged into the middle flexible 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 by the outer groove 322 . Define the surface D on the side of the outer lining 32 with the inner groove 321 and the outer groove 322 as the surface D, define the surface of the outer lining 32 on the side opposite to the surface D as the surface E, and define the outer lining 32 in the middle The two side elevations between D and surface E and parallel to the length direction of the outer lining 32 of the middle bag opening are surfaces F. A plurality of auxiliary deformation grooves B323 are arranged at intervals along the length direction on the outer lining 32 of the middle bag opening. The auxiliary deformation grooves B323 extend from the surface D to the surface E, and pass through the two surfaces F.

Multiple sets of side wall clamping assemblies are installed on the thin-walled opening profile 1 at intervals along the length direction of the thin-walled opening profile 1, and are located on the length of the thin-walled opening profile 1 between the two clamping devices. The side wall clamping assembly includes a strong forceps 41 and spacers 42 respectively welded on the two jaws of the strong forceps 41 . The forceps 41 are movably clamped on the two opposite outer side walls of the thin-walled opening profile 1 through two spacers 42 .

Preferably, the plug portion A223 is a positioning hole provided on the connecting seat 22, and the plug 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, the movable plug connection between the plug-in part A223 and the plug-in part B261 is realized.

Preferably, the casing 21 has a two-section split structure, and the profile loading and unloading port 211 and the power inlet 212 are respectively provided on the two sections of the casing 21 . Based on this structure, the assembly and disassembly of the internal components of the housing 21 is facilitated.

Preferably, the two pressing blocks A24 are respectively provided with criss-crossing anti-skid textures on the oppositely arranged surfaces.

Preferably, the two pressing blocks B25 are respectively provided with criss-cross anti-skid lines on the surfaces arranged oppositely.

Preferably, the depth of the notch 272 of the end lining 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 area, the lower end surface of the end lining block 27 Flush with the two flanges 12 of the thin-walled opening profile 1 .

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

S01, filling and wrapping thin-walled opening profiles:

1. Install the middle flexible lining 31 in the U-shaped groove 11 of the thin-walled open profile 1. After the installation is in place, 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 the same as the The bottom of the U-shaped groove 11 is facing and attached, and the two surfaces C of the flexible inner lining 31 in the middle are respectively facing and attached to the two side walls of the U-shaped slot 11;

2. Install the outer lining 32 of the middle bag opening at the opening of the U-shaped groove 11 of the thin-walled opening profile 1, and ensure that it is opposite to the position of the middle flexible lining 31. On the one hand, it moves with the middle flexible lining 31 through the inner groove 321 On the other hand, it contains the opening of the thin-walled open profile 1 and the two flanges 12 through the outer groove 322, and on the other hand, it passes through the stepped surface between the outer groove 322 and the inner groove 321 and the thin-walled open profile. The two flanges 12 of 1 fit together;

3. Install the two end lining blocks 27 on 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 the installation is in place, the thin-walled open profile 1 The two side walls of the U-shaped groove 11 respectively pass through the two slots 271 of the end lining block 27 , and the end lining block 27 fills the U-shaped groove 11 through the area between the two slots 271 .

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 flexible inner lining 31 in the middle and the two end lining blocks 27 .

S02, adjust the chuck device to the initial state:

1. Connect the front ends of the power shafts 26 of the two sets of collet devices to the power output components of the stretch bender respectively, and control the action of the power output components of the stretch bender, so that the two sets of collet devices are arranged facing each other and at a distance from each other. the furthest distance;

2. Drive the power shaft 26 to move in the axial direction of the casing 21 , and then drive the four connection bases 22 along the inner hole of the casing 21 through the mating relationship between the plug-in parts B261 of the power shaft 26 and the plug-in parts A223 of the four connection bases 22 The walls move synchronously to expand the accommodation area to the limit;

In this step, on the one hand, the power output part of the stretch bender is used to drive the power shaft 26 to move horizontally and linearly; Move in a straight line.

S03, clamping and fixing thin-walled opening profiles:

1. Lift the thin-walled open profile 1 that has been filled and wrapped to the level, and make its two ends face the profile loading and unloading ports 211 of the two chuck devices respectively;

2. Control the action of the power output part of the stretch-bender, so that the two sets of collet devices move horizontally and linearly toward each other, so that the two ends of the thin-walled open profiles extend into the two parts through the profile loading and unloading ports 211 of the two collet devices respectively. in the accommodating area of the chuck device;

3. Control the action of the power output component of the stretch bender, drive the power shaft to move in the axial direction of the housing 21, and then drive the four Each connecting seat 22 moves synchronously along the inner hole wall surface of the housing 21 to reduce the accommodating area until the end of the thin-walled opening profile 1 is clamped;

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 forceps 41 to the clamping state, so that the two are connected to the forceps 41. The spacers 42 on the jaws are pressed against the two opposite outer side walls of the thin-walled opening profile 1 .

In this step, the distance between the two groups of adjacent side wall clamping components should take the minimum value under the premise of satisfying the following conditions; Adjacent sidewall clamping assemblies do not interfere.

When this step is completed, the thin-walled open profile 1 is jointly clamped by two clamping devices, the two pressing blocks A press the two side elevations of the end lining block respectively, and the pressing block B25 at the upper end passes through its lower surface Press the outer wall surface of the closed end of the thin-walled open profile, and the pressing block B25 at the lower end presses the two flanges 12 of the thin-walled open profile 1 and the lower end surface of the end lining block 27 through its upper surface.

Claims (5)

1. The clamping and fixing method for the drawing and bending process of thin-walled open profiles is based on the tooling assembly of the drawing-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 thin-walled openings The profile is provided with a U-shaped groove, one end of the U-shaped groove is closed, the other end is open, and the two edges of the opening are turned to the outside of the opening to form a flange; It is characterized by: a thin-walled open profile drawing and bending process tooling assembly, including a chuck device, a flexible lining package component and a side wall clamping component; Two sets of collet devices are respectively used to clamp both ends of thin-walled open profiles; the collet device includes shell, spring bolt, connecting seat, pressure block A, pressure block B, power shaft and end lining block; The casing is sleeve-shaped, and its inner hole wall is a conical surface. The two ends of the casing are respectively provided with a profile loading and unloading port and a power inlet that communicate with the inner hole of the casing. The waist-shaped hole of the hole, the extension direction of the waist-shaped hole is parallel to the axial direction of the shell; One side of the connection seat is provided with a convex arc surface for fitting the wall surface of the inner hole of the casing, and the other side of the connection seat is provided with a mounting surface and a plug-in part A; the four connection seats are uniformly distributed in the inner hole of the outer casing in two shapes. two opposite arrangements; One end of the head of the spring bolt is located outside the casing, and one end of the stem of the spring bolt passes through the waist-shaped hole on the casing, extends into the inner hole of the casing, and is threadedly connected with the connecting seat; the spring bolt forces the convex arc surface of the connecting seat to press through the elastic force. tightly on the wall of the inner hole of the shell; The two pressing blocks A are detachably connected to the mounting surfaces of the two oppositely arranged connecting seats, and are arranged oppositely; the two pressing blocks B are detachably connected to the mounting surfaces of the other two oppositely arranged connecting seats, and are opposite to each other. Arrangement; two pressing blocks A and two pressing blocks B are enclosed to form a accommodating area, and the accommodating area is directly connected with the profile loading and unloading port of the shell; The power shaft is movably installed on the power inlet of the casing, its front end protrudes outside the casing to receive external power, its rear end extends into the inner cavity of the casing, and its rear end is provided with a plug-in part B; the power shaft passes through the plug-in part B is movably plugged with the plug parts A of the four connection bases; the power shaft reciprocates linearly along the axial direction of the casing under the drive of external power, and then drives the four plug parts through the plug structure of the plug parts B and A Each connecting seat moves synchronously along the inner hole wall of the shell to expand or shrink the accommodation area; The end lining block is provided with two opposite side elevations and upper and lower end faces arranged between the two side elevations, and the end lining block is also provided with two slots penetrating the upper and lower end faces , there are gaps on both sides of the lower end face of the end lining block; the end lining block is movably installed in the accommodating area, and its two side elevations are clamped between the two pressing blocks A, and its upper end face and A gap is formed between the pressing blocks B; the two slots are connected to both sides of the gap at the upper end, respectively, and the two slots are connected to a gap at the lower end, so that the gap, the slot, and the gap are connected in turn to form a thin-walled opening. The clamping interval suitable for the shape of the profile; The flexible lining package assembly is installed on the thin-walled opening profile, and is located on the length of the thin-walled opening profile between the two chuck devices; the flexible lining package assembly includes a middle flexible inner lining and a middle opening outer lining; The middle flexible lining is a strip-shaped member, which is movably installed in the U-shaped groove of the thin-walled opening profile, and is adapted to the shape of the U-shaped groove of the thin-walled opening profile; it is defined that the middle flexible lining is opposite to the bottom of the U-shaped groove. The side surface of the middle flexible lining is defined as face A, the side surface of the middle flexible lining facing the opening of the U-shaped groove is defined as face B, and the surface of the middle flexible lining facing the two side walls of the U-shaped groove is defined as face C; A plurality of auxiliary deformation grooves A are arranged at intervals along the length direction, and the auxiliary deformation grooves A extend from the surface B to the surface A, and pass through the two surfaces C; The outer lining of the middle bag mouth is a strip-shaped member, and its one side surface is provided with an inner groove and an outer groove extending along the length direction and the groove depth is arranged in sequence from deep to shallow, and the outer groove is provided outside the inner groove and contains the inner groove. Inside; the outer lining of the middle bag mouth is movably plugged with the middle flexible inner lining through the inner groove on the one hand, and the opening of the thin-walled open profile and the two flanges are contained by the outer groove on the other hand; the outer lining of the middle bag mouth is defined with inner grooves and The surface of one side of the outer groove is surface D, and the surface of the side opposite to the surface D is defined as the surface E, and the outer lining of the middle opening is defined as being arranged between the surface D and the surface E and parallel to the length direction of the outer lining of the middle opening The two side elevations of the side are face F; the outer lining of the middle bag mouth is provided with a plurality of auxiliary deformation grooves B at intervals along the length direction, and the auxiliary deformation grooves B extend from the face D to the face E, and pass through the two faces F; A plurality of groups of side wall clamping components are installed on the thin-walled opening profiles at intervals along the length direction of the thin-walled opening profiles, and are located on the length of the thin-walled opening profiles between the two clamping devices; the side wall clamping components include a large force pliers and spacers welded at the two jaws of the pliers respectively; the pliers are movably clamped on the opposite outer side walls of the thin-walled opening profile through the two spacers; The clamping method is as follows: S01, filling and wrapping thin-walled opening profiles: 1. Install the middle flexible lining in the U-shaped groove of the thin-walled open profile. After the installation is in place, the middle flexible lining is located in the middle section of the U-shaped groove, and the surface A of the middle flexible lining is opposite to the bottom of the U-shaped groove. And fit, the two surfaces C of the middle flexible lining are facing and fit with the two side walls of the U-shaped groove respectively; 2. Install the outer lining of the middle bag opening at the opening of the U-shaped groove of the thin-walled opening profile, and ensure that it is opposite to the position of the middle flexible lining. On the one hand, it is movably inserted into the middle flexible lining through the inner groove, and on the other hand The opening of the thin-walled open profile and the two flanges are contained by the outer groove, and on the other hand, it is attached to the two flanges of the thin-walled open profile through the stepped surface between the outer groove and the inner groove; 3. Install the two end lining blocks on both ends of the thin-walled open profile, so as to fill both ends of the U-shaped groove of the thin-walled open profile. After the installation is in place, the two sides of the U-shaped groove of the thin-walled open profile The wall passes through the two slots of the end lining block respectively, and the end lining block fills the U-shaped groove through the area between the two slots; When this step is completed, the full 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 collet devices to the power output parts of the stretch bender respectively, and control the action of the power output parts of the stretch bender, so that the two sets of collet devices are arranged in front of each other and at the most distance. far distance; 2. Drive the power shaft to move in the axial direction of the casing, and then drive the four connecting bases to move synchronously along the inner hole wall of the casing through the mating relationship between the plug-in part B of the power shaft and the plug-in parts A of the four connection bases, which will accommodate The interval is expanded to the limit; In this step, on the one hand, the power output part of the stretch bender is used to drive the power shaft to move horizontally and linearly, and on the other hand, it is used to drive the chuck device to perform horizontal arc trajectory swing and/or horizontal straight movement and/or vertical straight line move; S03, clamping and fixing thin-walled opening profiles: 1. Lift the thin-walled open profile that has been filled and wrapped to the level, and make its two ends face the profile loading and unloading ports of the two chuck devices respectively; 2. Control the action of the power output part of the stretch-bender, so that the two sets of collet devices move horizontally and straightly, so that the two ends of the thin-walled open profiles extend into the two clips through the profile loading and unloading ports of the two collet devices respectively. in the accommodating area of the head device; 3. Control the action of the power output component of the stretch bender, drive the power shaft to move in the axial direction of the casing, and then drive the four connecting seats 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 Move synchronously along the wall of the inner hole of the shell to reduce the accommodating area until the end of the thin-walled opening profile is clamped; 4. Install multiple sets of side wall clamping components on the thin-walled open profile at intervals along the length direction of the thin-walled open profile, specifically adjust the high-strength pliers to the clamping state, so that the clamps connected to the two jaws of the high-strength pliers are installed. The spacer is pressed against the two opposite outer side walls of the thin-walled opening profile; When this step is completed, the thin-walled open profile is jointly clamped by the two clamping devices, the two pressing blocks A press the two side elevations of the end lining block respectively, and the pressing block B at the upper end is pressed by its lower surface Tighten the outer wall surface of the closed end of the thin-walled open profile, and the pressing block B at the lower end presses the two flanges of the thin-walled open profile and the lower end surface of the end lining block through its upper surface. 2. The method for clamping and fixing thin-walled opening profiles in a drawing and bending process as claimed in claim 1, wherein in step S03, the spacing between two groups of adjacent side wall clamping assemblies should be within a range that satisfies the following conditions. The minimum value is taken under the premise; the condition is: during the stretching and bending process of the thin-walled open profile, the two groups of adjacent side wall clamping components do not interfere. 3. The method for clamping and fixing a thin-walled open profile in a drawing-bending process as claimed in claim 2, wherein the two pressing blocks A are respectively provided with criss-crossing anti-skid lines on the oppositely arranged surfaces; the two pressing blocks B There are criss-crossed anti-slip textures on the oppositely arranged surfaces respectively. 4. The method for clamping and fixing a thin-walled open profile in a drawing and bending process as claimed in claim 3, wherein the notch depth of the end lining block is adapted to the flanging thickness of the thin-walled open profile; when the thin-walled open profile is When clamped in the clamping area, the lower end face of the end lining block is flush with the two flanges of the thin-walled open profile. 5. The method for clamping and fixing a thin-walled open profile in a drawing and bending process according to claim 3 or 4, wherein the plug-in part A is a positioning hole provided on the connecting seat, and the plug-in part B is provided on the power shaft The cylindrical boss at the rear end, the shape of the cylindrical boss is adapted to the shape of the positioning hole, so that the plug-in part A and the plug-in part B can be movably plugged.

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