阅读说明：本技术 一种带有可控半径尺寸功能的管材成型模具 (Tubular product forming die with controllable radius size function ) 是由 顾鲲鹏 王贞明 孙林燕 于 2021-10-12 设计创作，主要内容包括：本发明公开了一种带有可控半径尺寸功能的管材成型模具,包括驱动装置、安装座、扩径装置和补偿模头,驱动装置和安装座连接,扩径装置和安装座活动连接,驱动装置和扩径装置传动连接,扩径装置和补偿模头活动连接,驱动装置置于工作台上,驱动装置包括转动电机和驱动气缸,驱动气缸缸体和工作台紧固连接,驱动气缸输出端和转动电机底座传动连接,转动电机和安装座传动连接,驱动气缸伸出方向管材工件轴线重合,驱动装置还包括扩径电机,安装座包括上座和下座,上座和下座紧固连接,转动电机输出端和下座紧固连接,上座上设有安装槽,扩径电机置于安装槽内,上座上设有滞纳槽,滞纳槽和安装槽连通。(The invention discloses a pipe forming die with a controllable radius and size function, which comprises a driving device, a mounting seat, an expanding device and a compensation die head, wherein the driving device is connected with the mounting seat, the expanding device is movably connected with the mounting seat, the driving device is in transmission connection with the expanding device, the expanding device is movably connected with the compensation die head, the driving device is arranged on a workbench and comprises a rotating motor and a driving cylinder, the cylinder body of the driving cylinder is in fastening connection with the workbench, the output end of the driving cylinder is in transmission connection with the base of the rotating motor, the rotating motor is in transmission connection with the mounting seat, the driving cylinder extends out to coincide with the axis of a pipe workpiece, the driving device also comprises an expanding motor, the mounting seat comprises an upper seat and a lower seat, the upper seat is in fastening connection with the lower seat, the output end of the rotating motor is in fastening connection with the lower seat, the upper seat is provided with a mounting groove, and the expanding motor is arranged in the mounting groove, the upper seat is provided with a stagnation groove which is communicated with the mounting groove.)

1. The utility model provides a tubular product forming die with controllable radius size function which characterized in that: the pipe forming die comprises a driving device (1), an installation seat (2), an expanding device (3) and a compensation die head (4), wherein the driving device (1) is connected with the installation seat (2), the expanding device (3) is movably connected with the installation seat (2), the driving device (1) is in transmission connection with the expanding device (3), the expanding device (3) is movably connected with the compensation die head (4), the driving device (1) is arranged on a workbench, the driving device (1) comprises a rotating motor (11) and a driving cylinder (12), the cylinder body of the driving cylinder (12) is in fastening connection with the workbench, the output end of the driving cylinder (12) is in transmission connection with the base of the rotating motor (11), the rotating motor (11) is in transmission connection with the installation seat (2), and the pipe workpiece axes of the driving cylinder (12) in the extending direction coincide;

the driving device (1) further comprises an expanding motor (13), the mounting seat (2) comprises an upper seat (21) and a lower seat (22), the upper seat (21) is fixedly connected with the lower seat (22), the output end of the rotating motor (11) is fixedly connected with the lower seat (22), a mounting groove (211) is formed in the upper seat (21), the expanding motor (13) is arranged in the mounting groove (211), a stagnation groove (212) is formed in the upper seat (21), the stagnation groove (212) is communicated with the mounting groove (211), a transmission gear is arranged at the output end of the expanding motor (13) and is arranged in the stagnation groove (212), the expanding device (3) comprises a transmission ring (32) and an expanding die head (34), a rotary cavity (213) is formed in the outer side of the stagnation groove (212), the rotary cavity (213) is communicated with the stagnation groove (212), and the transmission ring (32) is rotatably connected with the rotary cavity (213), an inner tooth surface is arranged on the inner ring of the transmission ring (32), the transmission gear is meshed with the inner tooth surface of the transmission ring (32), a plurality of expanding grooves (214) are arranged along the rotary cavity (213), and the expanding die head (34) is connected with the expanding grooves (214) in a sliding manner;

the radian of the compensation die head (4) is gradually changed, grooves are respectively arranged on the inner side and the outer side of the large radian section of the expanding die head (34), the compensation die head (4) is in transmission connection with the expanding die head (34), lugs are respectively arranged at two ends of the compensation die head (4), the lugs are in rotation connection with the grooves, and the circle center of the arc section of the compensation die head (4) and the circle center of the arc section of the expanding die head (34) are located at the same side.

2. The pipe forming die with the function of controllable radius and size according to claim 1, characterized in that: the diameter expanding device (3) further comprises a plurality of guide arc plates (31), the transmission ring (32) is in transmission connection with the diameter expanding die head (34) through the guide arc plates (31), the upper seat (21) is provided with a plurality of guide grooves (215), the guide arc plates (31) are in sliding connection with the guide grooves (215), the upper ends of the guide arc plates (31) are provided with pre-tightening springs (35), the pre-tightening springs (35) are in fastening connection with the guide grooves (215), the guide arc plates (31) are three-side plates, the upper sides of the guide arc plates (31) are arc sides, the upper sides of the guide arc plates (31) are horizontally arranged, the vertical side line on one side of each guide arc plate (31) is provided with a sliding surface (311), the other vertical side line of each guide arc plate (31) is vertically arranged, the sliding surfaces (311) are obliquely arranged, the transmission ring (32) is provided with a plurality of transmission grooves (321), and the guide arc plates (31) are movably connected with the transmission grooves (321), one side of the sliding surface (311) is provided with a transmission rod (33), the guide arc plate (31) is in transmission connection with the expanding die head (34) through the transmission rod (33), the transmission rod (33) is in sliding connection with the guide arc plate (31), and one end, far away from the guide arc plate (31), of the transmission rod (33) is in rotating connection with the expanding die head (34) through a shaft pin.

3. The pipe forming die with the function of controlling the radius according to claim 2, wherein: the transmission groove (321) is arranged in an arc shape, the transmission groove (321) comprises a sliding plate section (3211) and an expansion section (3212), the guide arc plate (31) is arranged on the sliding plate section (3211), the guide arc plate (31) is in sliding connection with the sliding plate section (3211), the expansion section (3212) is communicated with the diameter expanding groove (214), and the diameter expanding die head (34) is in sliding connection with the expansion section (3212).

4. The pipe forming die with the function of controlling the radius according to claim 3, wherein: the diameter expanding die heads (34) are arranged in an arc shape, a compensation gap is arranged between every two adjacent diameter expanding die heads (34), the compensation die heads (4) are arranged in the compensation gap, two ends of each compensation die head (4) are movably connected with the diameter expanding die heads (34) on two sides respectively, the adjacent diameter expanding die heads (34) are in sliding connection, two sides of each diameter expanding die head (34) are respectively provided with a diameter expanding arc surface (341) and a guide arc surface (342), the radian of each diameter expanding die head (34) is gradually changed, the diameter expanding arc surfaces (341) are in sliding connection with the adjacent guide arc surfaces (342), the compensation die heads (4) are located on a large curvature radius section of each diameter expanding die head (34), a small curvature radius section of each diameter expanding die head (34) is rotationally connected with the transmission rod (33), and the outer sides of the compensation die heads (4) are arranged in an arc shape.

5. The pipe forming die with the function of controllable radius and size according to claim 1, characterized in that: the pipe forming die further comprises an extension seat (5), the extension seat (5) is in a circular truncated cone type design, and the large-diameter end of the extension seat (5) is fixedly connected with the upper seat (21).

6. The pipe forming die with the function of controllable radius and size according to claim 1, characterized in that: the mounting seat (2) further comprises a reinforcing column (23), and two ends of the reinforcing column (23) are respectively and fixedly connected with the upper seat (21) and the lower seat (22).

Technical Field

The invention relates to the technical field of pipe forming, in particular to a pipe forming die with a controllable radius and size function.

Background

Along with the continuous development of industrialization, it is higher and higher to various basic section bars, wherein, tubular product involves the transport of various fluids, and also stricter and stricter to the requirement of tubular product, in order to guarantee sealing performance, current tubular product expands through flaring device when the interface, and conventional flaring device contains fluid static pressure shaping and cold expanding shaping, and to some section bars that need expand in pipeline middle section, conventional flaring device shaping effect is just not very ideal.

When carrying out the pipeline middle section expansion, it is lower through hydrostatic pressure expansion efficiency, and can't guarantee the expansion homogeneity, carry out cold press molding through the lug, expand to the middle section only in order to guarantee, tubular product forming die conventional state size is less than the pipe diameter, and the location of being convenient for removes, when expanding, because there is the clearance between the lug, causes the indentation easily and connects the limit, makes local stress concentrate, is unfavorable for tubular product later stage to use. In addition, along with the pipe diameter grow, the pipe wall constantly thins, and clearance size constantly increases simultaneously, can greatly reduced shaping quality, influences life.

Disclosure of Invention

The invention aims to provide a pipe forming die with a controllable radius size function, so as to solve the problems in the background technology.

In order to solve the technical problems, the invention provides the following technical scheme:

a pipe forming die with a controllable radius and size function comprises a driving device, a mounting seat, an expanding device and a compensation die head, wherein the driving device is connected with the mounting seat, the expanding device is movably connected with the mounting seat, the driving device is in transmission connection with the expanding device, the expanding device is movably connected with the compensation die head, the driving device is arranged on a workbench, the driving device comprises a rotating motor and a driving cylinder, the cylinder body of the driving cylinder is fixedly connected with the workbench, the output end of the driving cylinder is in transmission connection with a base of the rotating motor, the rotating motor is in transmission connection with the mounting seat, and the driving cylinder extends out to coincide with the axis of a pipe workpiece.

When the pipe is molded and processed, the pipe is fixed by the clamping device, the pipe is prevented from shaking in the diameter expanding process, the pipe is vertically placed, the influence of the self weight of a workpiece on the molding precision is reduced, the driving device provides power, so that the expanding device can be conveniently moved to a position to be processed, the pipe is locally expanded by the expanding device, particularly the middle section of the pipe is expanded, the expanding efficiency is improved, the compensation die head assists in expanding, compensating the expanding device with equal circular expansion, increasing the effective contact area with the inner wall of the pipe, thereby reducing the indentation, preventing local stress concentration, thereby influencing later use, the expanding device is installed through the installation seat, the rotating motor is driven to move along the axial direction of the pipe through the driving cylinder, therefore, the pipe needing to be subjected to long-section machining is continuously machined, and the mounting seat is driven to rotate by the rotating motor.

The driving device further comprises an expanding motor, the mounting seat comprises an upper seat and a lower seat, the upper seat is tightly connected with the lower seat, the output end of the rotating motor is tightly connected with the lower seat, the upper seat is provided with a mounting groove, the expanding motor is arranged in the mounting groove, the upper seat is provided with a stagnation groove, the stagnation groove is communicated with the mounting groove, the output end of the expanding motor is provided with a transmission gear, the transmission gear is arranged in the stagnation groove, the expanding device comprises a transmission ring and an expanding die head, a rotary cavity is arranged on the outer side of the stagnation groove, the rotary cavity is communicated with the stagnation groove, the transmission ring is rotationally connected with the rotary cavity, the inner ring of the transmission ring is provided with an inner tooth surface, the transmission gear is meshed with the inner tooth surface of the transmission ring, the plurality of expanding grooves are arranged along the rotary cavity, and the expanding die head is slidably connected with the expanding grooves.

The expanding die heads are driven to stretch by the expanding motor to expand and close, the expanding diameter is controlled by the expanding motor, so that pipes with different sizes can be conveniently expanded, a quasi-circular arc surface is formed by a plurality of expanding die heads, so that the diameter of a workpiece is expanded, the expanding efficiency is improved, the inner walls of the pipes are subjected to solid cold press molding by the expanding die heads with higher rigidity and strength, the expanding precision is improved, the mounting seat is divided into an upper seat and a lower seat by a split design, the lower seat is in transmission connection with the output end of a rotating motor, the lower seat is driven to rotate by the rotating motor, so that the upper seat is driven to rotate, the long-section pipes are conveniently expanded, a tiny gap formed by expanding the inner walls of the pipes by rotation is removed, the forming quality of the pipes is improved, the smoothness of extension movement is improved, the axial stretching action force of the pipes by axial movement is reduced, and the pipes are ensured to be radially expanded, the expansion precision is improved, the expanding motor is fixed through the mounting groove, the expanding motor outputs torque, the transmission gear rotates along the fixed shaft in the accommodating groove through the eccentric arrangement of the axis, the transmission gear rotates, is meshed through an inner gear of an inner ring of the transmission ring and is transmitted through tooth surface meshing, so that the transmission ring is driven to rotate along the rotary cavity, power is transmitted through the transmission ring, the expanding die head is expanded and guided, and the expanding die head is telescopically guided through the expanding groove.

Further, the expanding device further comprises a plurality of guide arc plates, a transmission ring is in transmission connection with the expanding die head through the guide arc plates, a plurality of guide grooves are formed in the upper seat, the guide arc plates are in sliding connection with the guide grooves, pre-tightening springs are arranged at the upper ends of the guide arc plates, the pre-tightening springs are in fastening connection with the guide grooves, the guide arc plates are three-side plates, the upper sides of the guide arc plates are arc edges, the upper sides of the guide arc plates are horizontally arranged, sliding surfaces are arranged on vertical side lines on one sides of the guide arc plates, the other vertical side lines of the guide arc plates are vertically arranged, the sliding surfaces are obliquely arranged, a plurality of transmission grooves are formed in the transmission ring, the guide arc plates are movably connected with the transmission grooves, a transmission rod is arranged on one side of the sliding surfaces, the guide arc plates are in transmission connection with the expanding die head through transmission rods, the transmission rod is in sliding connection with the guide arc plates, and one ends of the transmission rods, which are far away from the guide arc plates, are rotatably connected with the expanding die head through shaft pins.

The guide arc plates are driven by the guide arc plates, the guide arc plates are limited by the transmission grooves of the transmission rings, when diameter expansion is needed, the transmission rings rotate, the overlapped space between the transmission grooves and the openings of the guide grooves is enlarged, the guide arc plates move downwards under the action of a pre-tightening spring, the size of the guide arc plates is gradually reduced from top to bottom, the transmission rod slides on a sliding surface along with the downward movement of the guide arc plates to output displacement, the transmission rod pushes the diameter expansion die head to move, the diameter expansion die head is guided to move by the walls of the diameter expansion slots, the diameter expansion die head rotates towards an inner ring while sliding, so that the outer ring is expanded outwards, the size of the outer ring is increased, controllable radius adjustment is carried out, the guide arc plates are arranged in an arc shape and are convenient to guide through the transmission grooves, the arc surfaces on the upper sides of the guide arc plates are mainly used for transmitting the output displacement of the pre-tightening springs, and the guide arc plates are vertically arranged through another vertical side line to guide the guide arc plates, the transmission rod slides on the sliding surface, and is rotatably connected with the expanding die head through the transmission groove for transmission and guide, so that the expanding die head can rotate while sliding outwards, the size of the die part can be controlled and adjusted, and the processing of pipe diameters with various sizes is facilitated.

Furthermore, the transmission groove is arranged in an arc shape and comprises a sliding plate section and an expansion section, the guide arc plate is arranged on the sliding plate section and is in sliding connection with the sliding plate section, the expansion section is communicated with the expanding groove, and the expanding die head is in sliding connection with the expansion section.

Through the arc arrangement of the transmission groove, when the transmission ring rotates, the guide is convenient to conduct, the movement interference is prevented, the guide arc plate is guided through the sliding plate section, in an initial state, the wall surface of the joint of the sliding plate section and the expansion section is in contact with the sliding surface, the vertical section of the guide arc plate is in contact with the guide groove, the guide arc plate is limited through matching, when the diameter expansion is conducted, the transmission ring and the diameter expansion die head rotate in the same direction, the transmission rod slides in the expansion section, the displacement is transmitted, the diameter expansion die head is pushed to slide outwards, and the diameter expansion die head is guided through the rotation of the diameter expansion groove.

Furthermore, the diameter expanding die heads are arranged in an arc shape, a compensation gap is arranged between every two adjacent diameter expanding die heads, the compensation die heads are arranged in the compensation gap, two ends of each compensation die head are movably connected with the diameter expanding die heads on two sides respectively, the adjacent diameter expanding die heads are in sliding connection, the two sides of each diameter expanding die head are provided with a diameter expanding arc surface and a guide arc surface respectively, the radian of each diameter expanding die head is gradually changed, the diameter expanding arc surfaces are in sliding connection with the adjacent guide arc surfaces, the compensation die heads are located on the large curvature radius sections of the diameter expanding die heads, the small curvature radius sections of the diameter expanding die heads are rotatably connected with the transmission rods, and the outer sides of the compensation die heads are arranged in an arc shape.

The expansion die head is arranged in an arc shape and is divided into an expansion arc surface and a guide arc surface, the front section of the expansion arc surface is contacted with the pipe so as to expand the pipe, the rear section of the expansion arc surface is contacted with the guide arc surface so as to be interlocked, when the expansion die head moves to the outermost end, the arc is gradually arranged so as to adjust the radius, the compensation gap is gradually reduced in the expansion process, all the expansion arc surfaces form a whole circle so as to be tightly attached to the inner wall of the pipe, the stress is dispersed, the internal wrinkling is prevented, the expansion gap is prevented from being formed, the indentation is avoided, the edge-connecting bulge is generated, the stress concentration is caused, the forming quality is improved, the compensation gap between the adjacent expansion die heads is filled and compensated through the compensation die head, the curvature radius small section is contacted with the inner wall of the pipe in the initial state, the maximum forming effect is ensured, and the compensation die head rotates along with the expansion die heads on two sides after expansion, the expansion die head is driven to rotate on the inner wall of the pipe by rotating the motor after controllable radius expansion is finished, the abutting edge lug is removed by cold press molding, the smoothness of the inner wall of the pipe is improved, when the maximum diameter is expanded, the compensation feeler is stored by the pit on the expansion die head, the expanded arc surface is abutted into a whole circle, the expanded arc surface is extruded by the guide arc surface and matched with the transmission rod to support the two ends, the two ends of the expanded arc surface are tightly extruded on the inner wall of the pipe, force application in the expansion stage is more uniform, and the pipe molding quality is improved.

Furthermore, the radian of the compensation die head is gradually changed, grooves are respectively arranged on the inner side and the outer side of the large section of the radian of the expanding die head, the compensation die head is in transmission connection with the expanding die head, bumps are respectively arranged at two ends of the compensation die head and are in rotary connection with the grooves, and the circle center of the arc section of the compensation die head and the circle center of the arc section of the expanding die head are positioned at the same side. The radian of the compensation die head is gradually changed, the compensation is performed on the whole expansion stage, when the diameter is the smallest, the compensation gap is the largest, the largest compensation amount is provided through the small end of the curvature radius, along with the continuous expansion of the expanding die head, the compensation gap is reduced, the smaller compensation amount is provided through the large end of the curvature radius, the compensation amount is automatically adjusted according to different expansion diameters, the compensation die head is rotatably connected with the expanding die heads on two sides through the convex block, and the compensation die head is accommodated through the groove.

As optimization, the pipe forming die further comprises an extension seat, the extension seat is in a circular truncated cone type design, and the large-diameter end of the extension seat is fixedly connected with the upper seat. The extension seat designed in the circular truncated cone shape is used for expanding and guiding, the extension seat is fixed through the upper seat, and the small-diameter end of the extension seat faces the front end of the pipe to be expanded.

As optimization, the mounting seat further comprises a reinforcing column, and two ends of the reinforcing column are respectively and fixedly connected with the upper seat and the lower seat. The upper seat and the lower seat are connected through the reinforcing columns, so that the connection strength is improved, and auxiliary guiding is performed through the lower seat.

Compared with the prior art, the invention has the following beneficial effects: when the diameter expanding device is used for expanding the diameter, the transmission ring rotates, the overlapped space of the opening parts of the transmission groove and the guide groove is enlarged, the guide arc plate moves downwards under the action of the pre-tightening spring, the transmission rod slides on the sliding surface to output displacement, the diameter expanding die head is pushed to move, the diameter expanding die head rotates towards the inner ring while sliding, and therefore the diameter expanding die head expands outwards, the size of the outer ring is increased, the controllable radius is adjusted, and the diameter expanding device is convenient for processing pipe diameters of various sizes; the front section of the expanding cambered surface is contacted with the pipe, so that the pipe is expanded, the rear section of the expanding cambered surface is contacted with the guide cambered surface, so that the pipe is interlocked, when the expanding die head moves to the outermost end, the compensation clearance is minimum through the gradual change of the radian, so that all the expanding cambered surfaces form a whole circle, so that the expanding cambered surfaces are tightly attached to the inner wall of the pipe, the stress is dispersed, the internal wrinkling is prevented, the expansion clearance is avoided, the indentation is formed, the edge connection bulge is generated, the stress concentration is caused, and the forming quality is improved; the compensation gap between adjacent expanding die heads is filled and compensated through the compensation die heads, the maximum forming effect is ensured, after expansion, the compensation die heads rotate along with the expanding die heads on two sides, the expanding die heads are driven to rotate on the inner wall of the pipe through rotating a motor, abutting side bumps are removed through cold press forming, the smoothness of the inner wall of the pipe is improved, when the maximum diameter is expanded, the compensation feelers are stored through pits on the expanding die heads, the expanding cambered surfaces are abutted into a whole circle, the expanding cambered surfaces are extruded through guide cambered surfaces, force is transferred through a transmission rod, double-end support is carried out, two ends of the expanding cambered surfaces are tightly extruded on the inner wall of the pipe, force application in the expansion stage is more uniform, and the forming quality of the pipe is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of the general structure of the present invention;

FIG. 2 is a schematic view of the power transmission configuration of the present invention;

FIG. 3 is a schematic structural view of a mounting seat and an expanding device of the present invention;

FIG. 4 is a sectional view taken along line A-A of the view of FIG. 3;

FIG. 5 is a schematic view of the guide arc plate structure of the present invention;

FIG. 6 is an enlarged view of portion B of the view of FIG. 4;

FIG. 7 is an enlarged view of portion C of the view of FIG. 4;

in the figure: 1-driving device, 11-rotating motor, 12-driving cylinder, 13-expanding motor, 2-mounting seat, 21-upper seat, 22-lower seat, 23-reinforcing column, 211-mounting groove, 212-slow groove, 213-revolving groove, 213-expanding groove, 215-guide groove, 3-expanding device, 31-guide arc plate, 311-sliding surface, 32-transmission ring, 321-transmission groove, 3211-sliding plate section, 3212-expanding section, 33-transmission rod, 34-expanding die head, 341-expanding arc surface, 342-guide arc surface, 35-pretension spring, 4-compensation die head and 5-extending seat.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides the technical scheme that:

as shown in fig. 1 to 5, a pipe forming die with a controllable radius and size function comprises a driving device 1, a mounting seat 2, an expanding device 3 and a compensation die head 4, wherein the driving device 1 is connected with the mounting seat 2, the expanding device 3 is movably connected with the mounting seat 2, the driving device 1 is in transmission connection with the expanding device 3, the expanding device 3 is movably connected with the compensation die head 4, the driving device 1 is arranged on a workbench, the driving device 1 comprises a rotating motor 11 and a driving cylinder 12, the cylinder body of the driving cylinder 12 is tightly connected with the workbench, the output end of the driving cylinder 12 is in transmission connection with the base of the rotating motor 11, the rotating motor 11 is in transmission connection with the mounting seat 2, and the axes of pipe workpieces coincide in the extending direction of the driving cylinder 12.

When the pipe is molded and processed, the pipe is fixed by the clamping device, the pipe is prevented from shaking in the diameter expanding process, the pipe is vertically placed, the influence of the self weight of a workpiece on the molding precision is reduced, the driving device 1 provides power, so that the expanding device 3 can be conveniently moved to a position to be processed, the pipe is locally expanded through the expanding device 3, particularly the middle section of the pipe is expanded, the expanding efficiency is improved, the compensation die head 4 assists in expanding, compensating the expanding device 3 with equal circular expansion, increasing the effective contact area with the inner wall of the pipe, thereby reducing indentation and preventing local stress concentration so as to influence later use, the expanding device 3 is installed through the installation seat 2, the rotating motor 11 is driven by the driving cylinder 12 to move along the axial direction of the pipe, therefore, the pipe needing long-section processing is processed continuously, and the mounting base 2 is driven to rotate by the rotating motor 11.

As shown in fig. 2 to 4, the driving device 1 further includes an expanding motor 13, the mounting base 2 includes an upper base 21 and a lower base 22, the upper base 21 is fastened to the lower base 22, an output end of the rotating motor 11 is fastened to the lower base 22, the upper base 21 is provided with a mounting groove 211, the expanding motor 13 is disposed in the mounting groove 211, the upper base 21 is provided with a holding groove 212, the holding groove 212 is communicated with the mounting groove 211, an output end of the expanding motor 13 is provided with a transmission gear, the transmission gear is disposed in the holding groove 212, the expanding device 3 includes a transmission ring 32 and an expanding die head 34, a rotation cavity 213 is disposed outside the holding groove 212, the rotation cavity 213 is communicated with the holding groove 212, the transmission ring 32 is rotatably connected with the rotation cavity 213, an inner tooth surface is disposed on an inner ring of the transmission ring 32, the transmission gear is engaged with the inner tooth surface of the transmission ring 32, a plurality of expanding grooves 214 are disposed along the rotation cavity 213, and the expanding die head 34 is slidably connected with the expanding grooves 214.

The expanding die heads 34 are driven to stretch by the expanding motor 13 so as to be expanded and closed, the expanding diameter is controlled by the expanding motor 13 so as to be convenient for expanding pipes with different sizes, a quasi-circular arc surface is formed by a plurality of expanding die heads 34 so as to expand the diameter of a workpiece, the expanding efficiency is improved, the inner walls of the pipes are subjected to solid cold press molding by the expanding die heads 34 with higher rigidity and strength so as to improve the expanding precision, the mounting seat 2 is divided into an upper seat 21 and a lower seat 22 by a split design, the lower seat 22 is in transmission connection with the output end of the rotating motor 11, the lower seat 22 is driven to rotate by the rotating motor 11 so as to drive the upper seat 21 to rotate, so that the long-section pipes are conveniently expanded, a tiny gap formed by expanding the inner walls of the pipes by rotating is removed, the forming quality of the pipes is improved, the smoothness of extension movement is improved, and the axial tensile acting force of the pipes by the axial movement is reduced, the pipe is ensured to be expanded along the radial direction, the expansion precision is improved, the expanding motor 13 is fixed through the mounting groove 211, the expanding motor 13 outputs torque, the transmission gear rotates along the fixed shaft in the accommodation groove 212 through the eccentric arrangement of the axis, the transmission gear rotates, the internal gear of the inner ring of the transmission ring 32 is meshed, the transmission is carried out through the meshing of the tooth surfaces, the transmission ring 32 is driven to rotate along the rotary cavity 213, the power is transmitted through the transmission ring 32, the expanding die head 34 is expanded and guided, and the expanding die head 34 is telescopically guided through the expanding groove 214.

As shown in fig. 2 to 6, the expanding device 3 further comprises a plurality of guiding arc plates 31, a transmission ring 32 is in transmission connection with the expanding die head 34 through the guiding arc plates 31, the upper seat 21 is provided with a plurality of guiding grooves 215, the guiding arc plates 31 are in sliding connection with the guiding grooves 215, the upper ends of the guiding arc plates 31 are provided with pre-tightening springs 35, the pre-tightening springs 35 are in fastening connection with the guiding grooves 215, the guiding arc plates 31 are three-edge plates, the upper sides of the guiding arc plates 31 are arc edges, the upper sides of the guiding arc plates 31 are horizontally arranged, a vertical edge line at one side of the guiding arc plates 31 is provided with a sliding surface 311, the other vertical edge line of the guiding arc plates 31 is vertically arranged, the sliding surface 311 is obliquely arranged, the transmission ring 32 is provided with a plurality of transmission grooves 321, the guiding arc plates 31 are movably connected with the transmission grooves 321, a transmission rod 33 is arranged at one side of the sliding surface 311, the guiding arc plates 31 are in transmission connection with the expanding die head 34 through the transmission rod 33, the transmission rod 33 is in sliding connection with the guiding arc plates 31, the end of the transmission rod 33 far away from the guide arc plate 31 is rotatably connected with the diameter expanding die head 34 through a shaft pin.

The guide arc plate 31 is driven by the guide arc plate 31, the guide arc plate 31 is limited by the transmission groove 321 of the transmission ring 32, when the diameter needs to be expanded, the transmission ring 32 rotates, the overlapped space of the openings of the transmission groove 321 and the guide groove 215 is enlarged, the guide arc plate 31 moves downwards under the action of the pre-tightening spring 35, the size of the guide arc plate 31 is gradually reduced from top to bottom, the transmission rod 33 slides on the sliding surface 311 along with the downward movement of the guide arc plate 31 to output displacement, the transmission rod 33 pushes the diameter expansion die head 34 to move, the diameter expansion die head 34 is guided by the wall surface of the diameter expansion groove 214, the diameter expansion die head 34 rotates towards the inner ring while sliding, so that the outer ring is expanded outwards to increase the size and perform controllable radius adjustment, the arc-shaped surface of the guide arc plate 31 is conveniently guided by the transmission groove 321, the arc-shaped surface on the upper side of the guide arc plate 31 is mainly used for transmitting the output displacement of the pre-tightening spring and is vertically arranged by the other vertical side line, the guide arc plate 31 is guided, the slide surface 311 is obliquely arranged, transmission is carried out in the downward moving process, the transmission rod 33 is driven to move, the transmission rod 33 slides on the slide surface 311 and is driven and guided through the transmission groove 321, the transmission rod 33 is rotatably connected with the diameter expanding die head 34, the diameter expanding die head 34 can conveniently slide outwards and simultaneously rotate, the size of the die part can be controlled and adjusted, and the processing of the pipe diameters with various sizes is facilitated.

As shown in fig. 4 to 6, the transmission groove 321 is arranged in an arc shape, the transmission groove 321 includes a sliding plate segment 3211 and an expansion segment 3212, the guide arc plate 31 is disposed on the sliding plate segment 3211, the guide arc plate 31 is slidably connected with the sliding plate segment 3211, the expansion segment 3212 is communicated with the expanding groove 214, and the expanding die head 34 is slidably connected with the expansion segment 3212.

The transmission grooves 321 are arranged in an arc shape, so that guiding is facilitated when the transmission ring 32 rotates, movement interference is prevented, the guide arc plate 31 is guided through the sliding plate sections 3211, in an initial state, the wall surface of the joint of the sliding plate sections 3211 and the expansion sections 3212 is in contact with the sliding surface 311, the vertical sections of the guide arc plate 31 are in contact with the guide grooves 215, the guide arc plate is limited through matching, when expanding is performed, the transmission ring 32 and the expanding die head 34 rotate in the same direction, the transmission rod 33 slides in the expansion sections 3212 to transmit displacement, the expanding die head 34 is pushed to slide outwards, and the expanding die head 34 is rotatably guided through the expanding grooves 214.

As shown in fig. 4 to 7, the expanding die heads 34 are arranged in an arc shape, a compensation gap is arranged between adjacent expanding die heads 34, the compensation die heads 4 are arranged in the compensation gap, two ends of each compensation die head 4 are respectively movably connected with the expanding die heads 34 on two sides, the adjacent expanding die heads 34 are in sliding connection, two sides of each expanding die head 34 are respectively provided with an expanding arc surface 341 and a guiding arc surface 342, the arcs of the expanding die heads 34 are gradually changed, the expanding arc surfaces 341 are in sliding connection with the adjacent guiding arc surfaces 342, the compensation die heads 4 are positioned on a large curvature radius section of the expanding die heads 34, a small curvature radius section of the expanding die heads 34 is rotatably connected with the transmission rod 33, and the outer sides of the compensation die heads 4 are arranged in an arc shape.

The diameter-expanding die head 34 is arranged in an arc shape and is divided into a diameter-expanding arc surface 341 and a guide arc surface 342, the front section of the diameter-expanding arc surface 341 is contacted with the pipe so as to expand the pipe, the rear section of the diameter-expanding arc surface 341 is contacted with the guide arc surface 342 so as to be interlocked, when the diameter-expanding die head 34 moves to the outermost end, the radius is adjusted through the gradual change of the arc, the compensation gap is gradually reduced in the expansion process, all the diameter-expanding arc surfaces 341 form a whole circle, so that the whole circle is tightly attached to the inner wall of the pipe, the stress is dispersed, the internal wrinkling is prevented, the expansion gap, the indentation, the edge-connecting bulge and the stress concentration are avoided, so that the molding quality is improved, the compensation gap between the adjacent diameter-expanding die heads 34 is filled and compensated through the compensation die head 4, the small section of the curvature radius is contacted with the inner wall of the pipe in the initial state, the maximum molding effect is ensured, and after the expansion, the compensation die head 4 rotates along with the expanding die heads 34 on the two sides, so that a large curvature radius section is in contact with the inner wall of the pipe, the contact area with the inner wall of the pipe is increased, the joint edge gap is reduced, after controllable radius expansion is completed, the motor 11 rotates to drive the expanding die head 34 to rotate on the inner wall of the pipe, the joint edge convex blocks are removed through cold press molding, the smoothness of the inner wall of the pipe is improved, when the diameter is expanded to the maximum diameter, the compensation die head 4 is accommodated through pits in the expanding die head, so that the joint edge of the expanding arc surface 341 is in a whole circle, the expanding arc surface 341 is extruded through the guide arc surface 342, force is transferred through the transmission rod 33, double-end support is performed, the two ends of the expanding arc surface 341 are tightly extruded on the inner wall of the pipe, force application in the expansion stage is more uniform, and the forming quality of the pipe is improved.

As shown in fig. 4-6, the radian of the compensation die head 4 is gradually changed, the inner side and the outer side of the large radian section of the diameter-expanding die head 34 are respectively provided with a groove, the compensation die head 4 is in transmission connection with the diameter-expanding die head 34, two ends of the compensation die head 4 are respectively provided with a lug, the lug is in rotation connection with the groove, and the circle center of the arc section of the compensation die head 4 and the circle center of the arc section of the diameter-expanding die head 34 are positioned at the same side.

The radian of the compensation die head 4 is gradually changed, the compensation is performed on the whole expansion stage, when the diameter is the smallest, the compensation gap is the largest, the largest compensation amount is provided through the small end of the curvature radius, the compensation gap is reduced along with the continuous expansion of the expanding die head, the smaller compensation amount is provided through the large end of the curvature radius, the compensation amount is automatically adjusted according to different expansion diameters, the compensation die head 4 is rotatably connected with the expanding die heads 34 on two sides through the convex block, and the compensation die head 4 is accommodated through the groove.

As optimization, the pipe forming die further comprises an extension seat 5, the extension seat 5 is in a circular truncated cone type design, and the large-diameter end of the extension seat 5 is fixedly connected with the upper seat 21. The extension seat 5 through the design of round platform formula expands the direction, fixes extension seat 5 through last seat 21, and extension seat 5 path end is towards the tubular product front end of treating the expansion.

Preferably, the mounting base 2 further comprises a reinforcing column 23, and two ends of the reinforcing column 23 are respectively and fixedly connected with the upper base 21 and the lower base 22. The upper seat 21 and the lower seat 22 are connected by the reinforcing column 23, so that the connection strength is improved, and auxiliary guiding is performed by the lower seat 22.

The working principle of the invention is as follows: when the diameter needs to be expanded, the transmission ring 32 rotates, the overlapped space of the openings of the transmission groove 321 and the guide groove 215 is enlarged, the guide arc plate 31 moves downwards under the action of the pre-tightening spring 35, the size of the guide arc plate 31 is gradually reduced from top to bottom, the transmission rod 33 slides on the sliding surface 311 to output displacement, the diameter expansion die head 34 is pushed to move, the diameter expansion die head 34 is guided to move through the wall surface of the diameter expansion groove 214, the diameter expansion die head 34 rotates towards the inner ring while sliding, and therefore the diameter expansion die head is expanded outwards, the size of the outer ring is increased, controllable radius adjustment is carried out, and the diameter of pipe with various sizes is convenient to process; the expanding die head 34 is divided into an expanding arc surface 341 and a guiding arc surface 342, the front section of the expanding arc surface 341 is contacted with the pipe to expand the pipe, the rear section of the expanding arc surface 341 is contacted with the guiding arc surface 342 to interlock, when the expanding die head 34 moves to the outermost end, the radius is adjusted through gradual change of the arc, the compensation gap is gradually reduced in the expanding process, all the expanding arc surfaces 341 form a whole circle, so that the expanding arc surfaces are tightly attached to the inner wall of the pipe, the stress is dispersed, the internal wrinkling is prevented, the expanding gap is avoided, the indentation is formed, the edge-connecting bulge is generated, the stress concentration is caused, and the forming quality is improved; the compensation gap between the adjacent expanding die heads 34 is filled and compensated through the compensation die head 4, the small curvature radius section is contacted with the inner wall of the pipe in the initial state to ensure the maximum forming effect, after expansion, the compensation die head 4 rotates along with the expanding die heads 34 on two sides to enable the large curvature radius section to be contacted with the inner wall of the pipe and increase the contact area with the inner wall of the pipe, so that the joint edge gap is reduced, after controllable radius expansion is completed, the motor 11 rotates to drive the expanding die heads 34 to rotate on the inner wall of the pipe, the joint edge convex blocks are removed through cold press forming, so that the smoothness of the inner wall of the pipe is improved, when the expansion die head is expanded to the maximum diameter, the compensation die head 4 is accommodated through the pits on the expanding die heads, so that the expanding arc surface 341 is jointed into a whole circle, the expanding arc surface 341 is extruded through the guide arc surface 342, and the transmission rod 33 is matched to transmit force, so that double-end support is carried out, the two ends of the expanding cambered surface 341 are tightly extruded on the inner wall of the pipe, so that the force application in the expansion stage is more uniform, and the forming quality of the pipe is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.