CN114798938B - Straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming - Google Patents
Straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming Download PDFInfo
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- CN114798938B CN114798938B CN202210403885.4A CN202210403885A CN114798938B CN 114798938 B CN114798938 B CN 114798938B CN 202210403885 A CN202210403885 A CN 202210403885A CN 114798938 B CN114798938 B CN 114798938B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
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Abstract
The invention discloses an internal stay and external clip type clamping boosting device for a straight pipe section for bending and forming a thin-wall pipe. Comprises a clamping device, a conformal supporting device and a slide block driving part; the linear motor of the slide block driving part drives the internal expansion shape-preserving slide block and the clamping slide block to slide on a T-shaped slide rail of the pipe bender frame, and the clamping slide block of the clamping device controls the radial movement of the clamping block along a slide groove formed on the clamping device bracket through the rotation of the clamping connecting rod, so that the clamping function of the thin-wall pipe straight pipe section is realized; the inner expansion supporting slide block and the clamping slide block of the inner expansion shape-preserving device synchronously move to drive the inner expansion pull rod to axially move, and the inclined wedge fixedly connected with the inner expansion supporting block penetrates through the square groove of the inner expansion shape-preserving device bracket to be matched with the inclined surface of the wedge-shaped pull rod, so that the front-back movement of the inner expansion supporting slide block is converted into the movement of the inner expansion supporting block stretching along the radial direction. The invention can realize the clamping boosting function of the bent straight pipe section of the thin-wall pipe and simultaneously achieve the supporting and shape-keeping effects of the inner side of the pipe wall in the clamping boosting process.
Description
Technical Field
The invention belongs to the field of bending forming of thin-wall pipe fittings, and particularly relates to an internal-supporting external-clamping type clamping boosting device for a straight pipe section for bending forming of a thin-wall pipe.
Background
With the wide application of the thin-wall pipe fitting in the fields of vehicles, aviation, ships and the like, the bending forming technology of the thin-wall pipe fitting is also continuously developed. However, before the thin-wall pipe is bent and formed on the pipe bending machine, the pipe to be bent needs to be clamped and fixed on the numerical control pipe bending machine so as to position the pipe and match with a die of the pipe bending machine. In the clamping process, the pipe wall of the thin-wall pipe is thin, the rigidity is poor, and the section deformation of the clamping section is easily caused by large clamping force when the straight pipe section is clamped, so that the bending performance and the forming quality of the thin-wall pipe are affected.
Most of the existing clamping devices for the straight pipe sections of the thin-wall pipe fittings used in industrial production only consider the deformation of the outer sides of the pipe walls, and the inner sides of the pipe walls are difficult to clamp while the pipe fittings are clamped, so that the requirements for controlling the deformation of the sections in the process of clamping the thin-wall pipe fittings are met.
Disclosure of Invention
In order to solve the problems in the background art, the invention discloses an internal-supporting external-clamping type clamping boosting device for a straight pipe section for bending and forming a thin-wall pipe, which effectively solves the problems that the conventional clamping device for the straight pipe section of the thin-wall pipe cannot ensure that the section is not damaged and deformed in the clamping process. The clamping and shape-preserving device can clamp the outer side of the bent pipe and simultaneously achieve shape preserving of the inner side of the pipe wall, synchronous control of the clamping and shape-preserving device is achieved, and quality of the straight pipe section of the thin-wall bent pipe is improved.
The technical scheme adopted by the invention is as follows:
1. straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming
The clamping boosting device comprises a clamping device, a conformal supporting device and a sliding block driving part which are arranged on a frame of the pipe bending machine; the clamping device clamps the outer wall of the pipe fitting inwards, the conformal supporting device stretches the inner wall of the pipe fitting outwards, and the sliding block driving part drives the clamping device and the conformal supporting device to move simultaneously.
The slide block driving part comprises a linear motor, a clamping cylindrical slide block, an internal expansion supporting slide block and a clamping conformal connecting block; the surface of the frame of the pipe bender is provided with a T-shaped sliding rail, a clamping cylindrical sliding block, a clamping conformal connecting block and an internal expansion supporting sliding block are sequentially arranged on the surface of the frame of the pipe bender, and the bottoms of the clamping cylindrical sliding block, the clamping conformal connecting block and the internal expansion supporting sliding block are provided with T-shaped sliding grooves which are matched and connected with the T-shaped sliding rail; an output shaft of the linear motor is connected with the internal expansion supporting sliding block.
The shape-preserving supporting device comprises an internal expansion shape-preserving device bracket, a wedge-shaped pull rod and a plurality of arc supporting blocks; an internal expansion shape-preserving device bracket is fixed between the clamping cylindrical sliding block and the internal expansion supporting sliding block, one end of the internal expansion shape-preserving device bracket, which is close to the clamping cylindrical sliding block, is provided with a supporting tube, the supporting tube extends into an annular hole formed in the clamping cylindrical sliding block, and a plurality of through grooves are formed in the circumferential direction of the supporting tube at equal intervals; the wedge-shaped pull rod is positioned in the support tube, one end of the wedge-shaped pull rod extends out of the central hole of the support of the internal expansion shape-retaining device and is fixedly connected with the internal expansion support sliding block, and the other end of the wedge-shaped pull rod is positioned at the position of the through groove in the support tube; a plurality of arc supporting blocks are circumferentially arranged on the outer peripheral surface of the supporting tube, and inclined wedges arranged on the inner side surfaces of the arc supporting blocks penetrate through grooves of the supporting tube and then are matched with inclined surfaces arranged on the end parts of the wedge-shaped pull rods.
The clamping device comprises a clamping device bracket and a plurality of circular arc clamping blocks; a clamping device bracket is arranged on the side of the clamping cylindrical sliding block, which is far away from the inner expanding supporting sliding block, and is provided with an annular hole coaxially arranged with the clamping cylindrical sliding block; the circular arc clamping blocks are circumferentially distributed to form a columnar clamping structure, one end of the columnar clamping structure extends out of the annular hole of the clamping device bracket, and the other end of the columnar clamping structure is hinged with the clamping cylindrical sliding block.
Two ends of the clamping conformal connecting block are respectively connected with the front end face of the internal expansion supporting sliding block and the rear end face of the clamping cylindrical sliding block; the linear motor is used for controlling the internal expansion supporting sliding block to axially move along the T-shaped sliding rail, and the internal expansion supporting sliding block pushes the clamping cylindrical sliding block to axially move along the T-shaped sliding rail through the clamping conformal connecting block.
The columnar clamping structure, the columnar supporting structure, the clamping device bracket, the clamping cylindrical sliding block, the supporting tube and the wedge-shaped pull rod are all coaxially arranged.
The arc supporting block is mainly formed by up-down butt joint of a replaceable inner arc plate and an inner expansion supporting plate through an inner hexagon bolt, and an inclined wedge is fixed on the inner side surface of the inner expansion supporting plate; the arc clamping block mainly comprises a clamping block and a replaceable outer arc plate which are in up-down butt joint through an inner hexagon bolt; the outer circular surface of the replaceable inner circular arc plate is used for supporting the inner wall of the thin-walled pipe to be bent, the inner circular surface of the replaceable outer circular arc plate is used for clamping and supporting the outer wall of the thin-walled pipe to be bent, and the inner circular arc plate and the outer circular arc plate with different sizes are replaced according to the curvature radius and the wall thickness of the pipe to be bent.
The wedge-shaped pull rod is of a tubular structure, a square block is arranged at the other end of the wedge-shaped pull rod, and each surface of the square block corresponding to the through groove is an inclined surface; the axial movement of the clamping cylindrical sliding block drives the axial movement of the wedge-shaped pull rod, and the axial movement of the wedge-shaped pull rod is converted into radial movement of the arc supporting block through surface contact with the inclined wedge block, so that the pipe to be bent is supported. The core rod arranged at the center of the internal expansion supporting slide block extends into the wedge-shaped pull rod pipe through the central hole of the bracket of the internal expansion shape-preserving device.
A columnar supporting structure formed by circumferentially arranging a plurality of arc supporting blocks sequentially stretches into the columnar clamping structure through annular holes of the clamping cylindrical sliding block and the clamping device bracket; a reset tension spring stretching along the radial direction is connected between the inner side surface of each circular arc supporting block and the outer peripheral surface of the supporting tube.
Each clamping block on the columnar clamping structure is provided with a T-shaped sliding block protruding outwards at the edge position of the side surface, sliding grooves which extend along the radial direction and correspond to the positions of the T-shaped sliding blocks are circumferentially arranged on the clamping device support at intervals, and the T-shaped sliding blocks extend into the sliding grooves and move along the radial direction of the sliding grooves; the outer peripheral surface of the clamping cylindrical sliding block is provided with lug seats corresponding to the positions of the T-shaped sliding blocks at intervals, one end of the clamping connecting rod is hinged with the lug seats on the clamping cylindrical sliding block, and the other end of the clamping connecting rod is hinged with the lug seats on the T-shaped sliding block.
The clamping connecting rod is driven to rotate through the axial movement of the clamping cylindrical sliding block, so that the axial movement of the clamping cylindrical sliding block is converted into the radial movement of the clamping block, and the pipe to be bent is clamped.
2. The application method of the straight pipe section internal stay external clamping type clamping boosting device for bending and forming the thin-wall pipe comprises the following steps:
1) The material to be bent is stretched between the columnar clamping structure and the columnar supporting structure, and the linear motor is controlled to work according to the radius and the wall thickness of the material to be bent:
the piston of the linear motor pushes the inner expansion supporting slide block and the clamping cylindrical slide block to axially move backwards along the T-shaped slide rail, the inner expansion supporting slide block pushes the wedge-shaped pull rod to move, the inclined surface of the wedge-shaped pull rod acts on the inclined wedge block, so that the inclined wedge block radially moves outwards in the square groove of the supporting tube to drive the arc supporting block to prop open in the tube, and pressure is provided for the inner wall of the material to be bent, so that the shape-preserving supporting function is realized;
the smaller the area of the overlapping part of the inclined plane of the end part of the wedge-shaped pull rod and the inclined wedge is, the farther the inclined wedge moves outwards along the radial direction until the inclined plane is not overlapped with the inclined wedge completely, at the moment, the inner expanding supporting block is expanded to the maximum expanding state, and the axial position of the inclined wedge is kept unchanged.
The clamping cylindrical sliding blocks move backwards along the axial direction, and the rotating pair formed by the lug seats and the clamping connecting rods drives the clamping connecting rods to rotate forwards, so that the T-shaped sliding blocks on all the circular arc clamping blocks are driven to move radially along the sliding grooves of the clamping device brackets, the circular arc clamping blocks do not move along the axial position and move towards the radial direction close to the axial line, and inward clamping of the pipe to be bent is realized;
2) Resetting the device:
the linear motor controls the inner expansion supporting sliding block to move forwards along the axial direction, the wedge-shaped pull rod is driven to move forwards, the reset tension spring connected with the inner expansion shape-preserving device bracket releases elastic potential energy, and the arc supporting block is pulled to move along the radial direction close to the axis, so that the shape-preserving supporting device is reset;
the clamping cylindrical sliding block and the internal expansion supporting sliding block move forwards along the axial direction at the same time, the clamping cylindrical sliding block drives the clamping connecting rod to rotate reversely, the T-shaped sliding block on the circular arc clamping block moves along the sliding groove of the clamping device bracket in the radial direction under the drive of the clamping connecting rod, namely the circular arc clamping block moves in the radial direction far away from the axis, and the automatic resetting of the clamping device is completed.
The circular arc clamping blocks and the circular arc supporting blocks provide pressure for the inner side and the outer side of the pipe wall of the pipe to be bent in the inward clamping and outward expanding process, so that the friction force of the pipe in the boosting process is increased, and the boosting of the pipe is facilitated.
The invention has the beneficial effects that:
1) According to the invention, the synchronous movement of the clamping slide block and the internal expansion support slide block is controlled, so that the internal expansion support piece is outwards spread on the inner side of the pipe wall, the clamping block is simultaneously inwards clamped on the outer side of the pipe, and the internal expansion shape-preserving device provides support inside the pipe fitting to achieve the shape preserving function of the straight pipe section of the thin-wall pipe, so that the section is prevented from deforming due to overlarge clamping force of the clamping device.
2) The invention can increase the pressure on the inner side and the outer side of the pipe through the clamping force and the internal expanding force respectively applied on the inner side and the outer side of the pipe, thereby increasing the friction force obtained when the pipe is boosted and realizing the purpose of providing larger boosting force.
3) According to the invention, the clamping and shape-keeping functions of the straight pipe sections of the pipes with different diameters and different wall thicknesses can be realized by changing the outer arc plate and the inner arc plate according to the processing and production requirements.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic cross-sectional view of the present invention.
Fig. 3 is a schematic view of a conformal support device according to the present invention, (a) is a perspective view, and (b) is a cross-sectional view.
Fig. 4 is a schematic structural view of the clamping device of the present invention, (a) is a perspective view, and (b) is a sectional view.
Fig. 5 is a schematic structural view of a circular arc clamping block according to the present invention.
FIG. 6 is a schematic view of a clamping cylindrical slider structure according to the present invention
FIG. 7 is a schematic view of the stent structure of the internal expanding conformal device of the present invention.
FIG. 8 is a schematic view of the main structure of the conformal support device of the present invention; (a) Is a structural schematic diagram of the inner expansion supporting block and the replaceable inner arc plate, and (b) is a structural schematic diagram of the wedge-shaped pull rod.
Fig. 9 is a schematic view of a slider driving apparatus according to the present invention.
FIG. 10 is a schematic illustration of the outward expansion of the inner expanding support block of the present invention; (a) (b) are two state diagrams of the initiation and completion of the intumescence support respectively.
FIG. 11 is a schematic illustration of the inward clamping process of the clamping blocks of the present invention; (a) (b) two state diagrams for the start and completion of clamping, respectively.
In the figure: clamping device 1, conformal support device 2, slider driving device 3, removable outer circular arc board 4, clamping device support 5, clamp cylindrical slider 6, internal expansion backup pad 7, wedge pull rod 8, internal expansion backup slider 9, linear motor 10, clamp connecting rod 11, clamp block 12, removable inner circular arc board 13, T-shaped slider 14, ear seat 15, internal expansion conformal device support 16, wedge 17, stay tube 18, clamp conformal connecting block 19, bending machine frame 20, reset tension spring 21.
Detailed Description
The invention will be described in further detail with reference to the drawings and examples.
As shown in fig. 1, the present invention includes a holding device 1, a shape-retaining support device 2, and a slider driving section 3, which are connected together by a slider of the slider driving section, which is a linear motor.
As shown in fig. 2 and 9, the slider driving section 3 includes a bender frame 20, a linear motor 10, a clamping cylindrical slider 6, an internal expansion support slider 9, and a clamping conformal connection frame 19. The middle of the clamping cylindrical sliding block 6 is provided with a hole for placing a thin-wall pipe, and the bottom of the clamping cylindrical sliding block is provided with a T-shaped sliding groove which is matched with a T-shaped sliding rail on the frame 20 of the pipe bender. The middle of the internal expansion supporting slide block 9 is provided with a hole for placing a core rod, the bottom of the internal expansion supporting slide block is provided with a T-shaped sliding groove, the internal expansion supporting slide block 9 moves back and forth on the T-shaped sliding rail, and the front end face of the internal expansion supporting slide block 9 is connected with the rear end face of the clamping and shape-preserving connecting frame 19. The linear motor 10 is placed at the rear side of the frame 20 of the pipe bender and provides power for the movement of the sliding block. The piston in the linear motor 10 is connected with the rear end face of the internal expansion supporting slide block 9, and synchronous control of inward radial clamping of the clamping block 12 and outward radial expansion of the internal expansion supporting block 7 is realized through the forward and backward movement of the piston along the axial direction of the pipe.
As shown in fig. 4, 5 and 6, the clamping device comprises four circumferentially arranged clamping blocks 12, a replaceable outer circular arc plate 4, a clamping device bracket 5, a clamping connecting rod 11 and a clamping cylindrical sliding block 6. Four T-shaped sliding grooves extending along the radial direction are circumferentially arranged on the clamping device bracket 5 at intervals, the inner circular surface of the clamping block 12 is connected with the replaceable outer circular arc plate 4 through an inner hexagonal bolt, the rear side is fixedly connected with a T-shaped sliding block 14, the T-shaped sliding grooves move along the radial direction, and the axial position is kept unchanged. The T-shaped sliding block 14 is connected with the clamping connecting rod 11 through the lug seat 15, the other end of the clamping connecting rod 11 forms a revolute pair with the clamping cylindrical sliding block 6 through the lug seat 15, the clamping connecting rod 11 is driven to rotate through the axial movement of the clamping cylindrical sliding block 6, the axial movement of the clamping cylindrical sliding block 6 is further converted into the radial movement of the clamping block 12, and the four clamping blocks 12 drive the replaceable outer circular arc plates 4 to move simultaneously to realize the clamping process of the straight pipe section of the thin-wall pipe.
As shown in fig. 3, 7 and 8, the shape-retaining support device comprises four circumferentially arranged inner expansion support blocks 7, a replaceable inner arc plate 13, inclined wedges 17, an inner expansion shape-retaining device bracket 16, a wedge-shaped pull rod 8 and an inner expansion support sliding block 9. The outer circular surface of the inner expansion supporting block 7 is connected with the replaceable inner circular arc plate 13 through an inner hexagon bolt, the inner circular surface is fixedly connected with the inclined wedge 17, a square groove is formed in the middle of the inner expansion conformal device support 16, the inclined wedge 17 penetrates through the square groove to be matched with a square inclined surface of a conical section on the wedge-shaped pull rod 8, the smaller the area of the overlapped part of the square inclined surface and the inclined wedge 17 is, the farther the inclined wedge 17 moves outwards along the inner diameter direction is, until the square inclined surface and the inclined wedge 17 are not overlapped completely, and at the moment, the inner expansion supporting block 7 is expanded to a maximum expanding state. Four circumferentially spaced reset springs 21 are fixedly connected with the outer circular surface of the support 16 of the internal expansion shape-retaining device, and the support is connected with the internal expansion supporting block 7 to realize internal expansion supporting reset. The rear side of the wedge-shaped pull rod 8 is connected with an inner expansion supporting slide block 9 through a bolt. The axial movement of the inner expansion supporting slide block 9 and the clamping cylindrical slide block 6 drives the axial movement of the wedge-shaped pull rod 8, so that the radial movement of the inner expansion supporting block 7 is controlled.
The wedge block is matched with the square inclined plane of the tapered section of the wedge-shaped pull rod, the axial movement of the wedge-shaped pull rod is converted into radial movement through the surface contact with the wedge block, the wedge block is matched with the wedge-shaped pull rod in the square groove to do radial movement, and the axial position of the wedge-shaped pull rod is kept unchanged.
Specific examples:
and after confirming the curvature radius and the wall thickness of the pipe, the outer arc plate and the inner arc plate are replaced.
1) According to the radius and wall thickness requirements of the material to be bent, the linear motor is controlled to work, a piston in the linear motor pushes the inner expansion supporting slide block 9 and the clamping cylindrical slide block 6 to axially move along a T-shaped sliding rail on the conformal clamping frame, the inner expansion supporting slide block 9 pushes the wedge-shaped pull rod 8 to move, the square inclined surface of the wedge-shaped pull rod 8 acts on the inclined wedge block 17, so that the inclined wedge block 17 radially moves in a square groove in the inner expansion conformal device bracket 16 to drive the inner expansion supporting block 7 to prop open in the pipe, and pressure is provided for the inner wall of the pipe, thereby realizing the conformal supporting function. The clamping cylindrical sliding block 6 and the inward expansion supporting sliding block 9 synchronously move under the drive of the cylinder piston, the clamping cylindrical sliding block 6 moves backwards along the axial direction, the rotating pair formed by the lug seat 15 and the clamping connecting rod 11 drives the clamping connecting rod 11 to rotate, the other end of the clamping connecting rod is connected with a T-shaped sliding rail of the clamping block 12, the clamping block 12 does not move along the axial position, and moves in the radial direction towards the direction close to the axial line in a T-shaped sliding groove of the clamping cylindrical sliding block, so that the radial inward clamping movement along the pipe diameter is completed.
As shown in fig. 10, when the linear motor adjusting piston pushes the inner expansion supporting slide block 9 to move right, the wedge-shaped pull rod 8 moves right, the superposition of the square inclined surface of the wedge-shaped pull rod 8 and the inclined surface of the inclined wedge block 17 is reduced, the position of the inclined wedge block 17 along the axial direction is unchanged, the inner expansion supporting block 7 and the replaceable inner arc plate 13 move along the inclined surface of the wedge-shaped pull rod 8 away from the axial direction in the radial direction, and the inner expansion supporting block 7 and the replaceable inner arc plate 13 move along the inclined wedge block 17 outwards in the radial direction to finish the movement of expanding outwards along the pipe diameter.
As shown in fig. 11, when the linear motor adjusting piston pushes the clamping cylindrical sliding block 6 to move right, the clamping connecting rod 11 is pulled to the right, so that the clamping pull rod 11 rotates anticlockwise around the lug seat 15, the T-shaped sliding block 14 at the rear side of the clamping block 12 is connected with the other end of the clamping pull rod through the lug seat 15, and moves in the direction close to the axis in the radial direction in the T-shaped sliding groove of the clamping device bracket 5 under the action of the force generated by the anticlockwise rotation of the clamping pull rod, and the clamping block 12 moves towards the axis direction, so that the clamping function is realized.
2) After the action of the inner support and the outer clamp is completed, the linear motor controls the piston to drive the inner expansion support slide block 9 and the clamping cylindrical slide block 6 to move leftwards, drives the wedge-shaped pull rod 8 to move leftwards, and the reset tension spring 21 connected with the inner expansion shape-preserving device bracket 16 releases elastic potential energy to pull the inclined wedge to move along the radial direction close to the axis, so that the shape-preserving support device is reset.
The clamping cylindrical sliding block 6 drives the clamping pull rod to rotate clockwise, so that the T-shaped sliding block 14 on the clamping block 12 is controlled to move away from the axis in the radial direction in the T-shaped sliding rail, and the clamping block 12 is driven to open outwards, so that resetting is realized.
The clamping blocks 12 and the internal expansion supporting sliding blocks 9 provide pressure for the inner side and the outer side of the pipe wall in the process of inwards clamping and outwards expanding, so that the friction force obtained by the pipe in the boosting process is increased, and the boosting function for the thin-wall pipe is realized.
Claims (6)
1. The internal supporting and external clamping type clamping boosting device for bending and forming the thin-wall pipe is characterized by comprising a clamping device (1), a conformal supporting device (2) and a sliding block driving part (3) which are arranged on a frame (20) of a pipe bender; the clamping device (1) is used for clamping the outer wall of the pipe fitting inwards, the conformal supporting device (2) is used for outwards expanding the inner wall of the pipe fitting, and the sliding block driving part (3) drives the clamping device (1) and the conformal supporting device (2) to move simultaneously;
the slide block driving part (3) comprises a linear motor (10), a clamping cylindrical slide block (6), an internal expansion supporting slide block (9) and a clamping conformal connecting block (19); the surface of a frame (20) of the pipe bender is provided with T-shaped sliding rails, a clamping cylindrical sliding block (6), a clamping conformal connecting block (19) and an internal expansion supporting sliding block (9) are sequentially arranged on the surface of the frame (20) of the pipe bender, and the bottoms of the clamping cylindrical sliding block (6), the clamping conformal connecting block (19) and the internal expansion supporting sliding block (9) are provided with T-shaped sliding grooves which are matched and connected with the T-shaped sliding rails; an output shaft of the linear motor (10) is connected with the internal expansion supporting slide block (9);
the conformal support device (2) comprises an internal expansion conformal device bracket (16), a wedge-shaped pull rod (8) and a plurality of arc support blocks; an internal expansion shape-preserving device bracket (16) is fixed between the clamping cylindrical sliding block (6) and the internal expansion supporting sliding block (9), one end, close to the clamping cylindrical sliding block (6), of the internal expansion shape-preserving device bracket (16) is provided with a supporting tube (18), the supporting tube (18) stretches into an annular hole formed in the clamping cylindrical sliding block (6), and a plurality of through grooves are formed in the supporting tube (18) at equal intervals in the circumferential direction; the wedge-shaped pull rod (8) is positioned in the tube of the support tube (18), one end of the wedge-shaped pull rod (8) extends out of the central hole of the support (16) of the internal expansion shape-retaining device and is fixedly connected with the internal expansion support sliding block (9), and the other end of the wedge-shaped pull rod (8) is positioned at the position of a through groove in the tube of the support tube (18); a plurality of arc supporting blocks are circumferentially arranged on the peripheral surface of the supporting tube (18), and inclined wedges (17) arranged on the inner side surfaces of the arc supporting blocks penetrate through the through grooves of the supporting tube (18) and then are matched with inclined surfaces arranged on the end parts of the wedge-shaped pull rods (8);
the clamping device (1) comprises a clamping device bracket (5) and a plurality of circular arc clamping blocks; a clamping device bracket (5) is arranged at the side of the clamping cylindrical sliding block (6) far away from the inner expanding supporting sliding block (9), and an annular hole which is coaxially arranged with the clamping cylindrical sliding block (6) is formed in the clamping device bracket (5); the circular arc clamping blocks are circumferentially distributed to form a columnar clamping structure, one end of the columnar clamping structure extends out of an annular hole of the clamping device bracket (5), and the other end of the columnar clamping structure is hinged with the clamping cylindrical sliding block (6);
two ends of the clamping conformal connecting block (19) are respectively connected with the front end face of the internal expansion supporting slide block (9) and the rear end face of the clamping cylindrical slide block (6); the linear motor (10) is used for controlling the inner expansion supporting sliding block (9) to axially move along the T-shaped sliding rail, and the inner expansion supporting sliding block (9) is used for pushing the clamping cylindrical sliding block (6) to axially move along the T-shaped sliding rail through the clamping conformal connecting block (19);
the wedge-shaped pull rod (8) is of a tubular structure, a square block is arranged at the other end of the wedge-shaped pull rod (8), and each surface of the square block corresponding to the through groove is an inclined surface;
the axial movement of the inner expansion supporting sliding block (9) drives the axial movement of the wedge-shaped pull rod (8), and the axial movement of the wedge-shaped pull rod (8) is converted into the radial movement of the arc supporting block through the surface contact with the inclined wedge block (17), so that the pipe to be bent is supported;
a columnar supporting structure formed by circumferentially arranging a plurality of arc supporting blocks sequentially stretches into the columnar clamping structure through annular holes of the clamping cylindrical sliding blocks (6) and the clamping device brackets (5); a reset tension spring (21) is connected between the inner side surface of each circular arc supporting block and the outer peripheral surface of the supporting tube (18).
2. The straight pipe section internal stay external clip type clamping boosting device for thin-wall pipe bending forming according to claim 1, wherein the arc supporting block mainly comprises a replaceable inner arc plate (13) and an inner expansion supporting plate (7) which are in up-down butt joint through bolts, and an inclined wedge block (17) is fixed on the inner side surface of the inner expansion supporting plate (7); the arc clamping block mainly comprises a clamping block (12) and a replaceable outer arc plate (4) which are in up-down butt joint through bolts;
the outer circular surface of the replaceable inner circular arc plate (13) is used for supporting the inner wall of the pipe to be bent, the inner circular surface of the replaceable outer circular arc plate (4) is used for clamping and supporting the outer wall of the pipe to be bent, and the inner circular arc plate (13) and the outer circular arc plate (4) with different sizes are replaced according to the curvature radius and the wall thickness of the pipe to be bent.
3. The clamping boosting device for the internal stay and external clip of the straight pipe section for bending and forming the thin-wall pipe according to claim 2, wherein each clamping block (12) on the columnar clamping structure is provided with a T-shaped sliding block (14) protruding outwards at the edge position of the side face, sliding grooves which extend along the radial direction and correspond to the positions of the T-shaped sliding blocks (14) are circumferentially arranged on the clamping device bracket (5) at intervals, and the T-shaped sliding blocks (14) extend into the sliding grooves and move along the radial direction of the sliding grooves;
the outer peripheral surface of the clamping cylindrical sliding block (6) is provided with lugs corresponding to the positions of the T-shaped sliding blocks (14) at intervals, one end of the clamping connecting rod (11) is hinged with the lugs on the clamping cylindrical sliding block (6), and the other end of the clamping connecting rod is hinged with the lugs on the T-shaped sliding blocks (14).
4. A straight tube section internal stay external clip type clamping boosting device for thin wall tube bending forming according to claim 3, characterized in that the clamping connecting rod (11) is driven to rotate by the axial movement of the clamping cylindrical sliding block (6), thereby the axial movement of the clamping cylindrical sliding block (6) is converted into the radial movement of the clamping block (12), and the clamping of the tube to be bent is realized.
5. The application method of the straight pipe section internal stay external clip type clamping boosting device for bending and forming the thin-wall pipe is characterized by comprising the following steps:
1) The material to be bent is stretched between the columnar clamping structure and the columnar supporting structure, and the linear motor (10) is controlled to work according to the radius and the wall thickness of the material to be bent:
the piston of the linear motor (10) pushes the inner expansion supporting slide block (9) and the clamping cylindrical slide block (6) to move backwards along the axial direction of the T-shaped slide rail, the inner expansion supporting slide block (9) pushes the wedge-shaped pull rod (8) to move, the inclined surface of the wedge-shaped pull rod (8) acts on the inclined wedge block (17), so that the inclined wedge block (17) radially moves outwards in the square groove of the supporting tube (18) to drive the arc supporting block to prop up in the tube, and pressure is provided for the inner wall of the material to be bent, so that the shape-preserving supporting function is realized;
the clamping cylindrical sliding blocks (6) move backwards along the axial direction, and the rotating pair formed by the lug seats and the clamping connecting rods (11) drives the clamping connecting rods (11) to rotate forwards, so that the T-shaped sliding blocks (14) on all the arc clamping blocks are driven to move radially along the sliding grooves of the clamping device brackets (5), and the arc clamping blocks do not move along the axial position and move towards the radial direction close to the axial line, so that the inward clamping of the pipe to be bent is realized;
2) Resetting the device:
the linear motor (10) controls the inner expansion supporting sliding block (9) to move forwards along the axial direction, the wedge-shaped pull rod (8) is driven to move forwards, the reset tension spring (21) connected with the inner expansion shape-preserving device bracket (16) releases elastic potential energy, and the arc supporting block is pulled to move along the radial direction close to the axis, so that the shape-preserving supporting device (2) is reset;
the clamping cylindrical sliding block (6) and the inward expansion supporting sliding block (9) move forwards along the axial direction at the same time, the clamping cylindrical sliding block (6) drives the clamping connecting rod (11) to rotate reversely, the T-shaped sliding block (14) on the circular arc clamping block moves radially along the sliding groove of the clamping device bracket (5) under the driving of the clamping connecting rod (11), namely, the circular arc clamping block moves towards the radial direction far away from the axis, and the automatic resetting of the clamping device (1) is completed.
6. The method for using the internal-supporting and external-clamping type clamping boosting device for the straight pipe section for bending and forming the thin-wall pipe according to claim 5, wherein the circular arc clamping blocks and the circular arc supporting blocks provide pressure on the inner side and the outer side of the pipe wall of the pipe to be bent in the process of inwards clamping and outwards expanding, so that the friction force of the pipe in the boosting process is increased, and the boosting of the pipe is facilitated.
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| CN202210403885.4A CN114798938B (en) | 2022-04-18 | 2022-04-18 | Straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming |
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| CN202210403885.4A CN114798938B (en) | 2022-04-18 | 2022-04-18 | Straight pipe section internal support external clamping type clamping boosting device for thin-wall pipe bending forming |
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| CN115122070B (en) * | 2022-08-30 | 2022-11-25 | 东营市港城热力有限公司 | Condenser pipe shifting-out equipment of carbon dioxide preheating power generation system |
| CN116786655A (en) * | 2023-06-20 | 2023-09-22 | 烟台国鑫金属包装制品有限公司 | Steel drum ring rib processing device |
| CN116494108A (en) * | 2023-06-28 | 2023-07-28 | 河北燕山钢铁集团有限公司 | Scrap steel structure reprocessing device of electric furnace |
| CN116493483B (en) * | 2023-06-29 | 2023-09-15 | 江苏宏亿精工股份有限公司 | Safety belt pretensioner pipe production equipment |
| CN117102925B (en) * | 2023-10-24 | 2024-02-02 | 锐承精密科技(江苏)有限公司 | Shaping clamp for thin-wall pipe part |
| CN117245021B (en) * | 2023-11-20 | 2024-01-23 | 自贡长盈精密技术有限公司 | High-precision rotatable angle aluminum product straightening device |
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| JP5419674B2 (en) * | 2009-12-18 | 2014-02-19 | 第一高周波工業株式会社 | Metal tube bending apparatus and method |
| CN206083892U (en) * | 2016-09-23 | 2017-04-12 | 重庆市汇畅钢管制造有限公司 | A two triangle claw dishes for fixing inside and outside wall of pipeline |
| CN107983981B (en) * | 2018-01-04 | 2023-07-18 | 华南理工大学 | Internal and external clamping method and device for thin-wall tubular part during rotary machining |
| CN208744049U (en) * | 2018-08-24 | 2019-04-16 | 杭州东霖染整机械有限公司 | A kind of pipeline clamping device |
| CN210847792U (en) * | 2019-09-24 | 2020-06-26 | 杭州瞿溪机械有限公司 | Clamping mechanism for pipe bender |
| CN211029594U (en) * | 2019-11-25 | 2020-07-17 | 北京宗合铁路轴承有限公司 | Clamp for superfinishing outer side wall of bearing inner ring |
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