CN110421031B - Large-caliber thin-wall pipe bending machine and thin-wall pipe bending manufacturing method - Google Patents
Large-caliber thin-wall pipe bending machine and thin-wall pipe bending manufacturing method Download PDFInfo
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- CN110421031B CN110421031B CN201910729008.4A CN201910729008A CN110421031B CN 110421031 B CN110421031 B CN 110421031B CN 201910729008 A CN201910729008 A CN 201910729008A CN 110421031 B CN110421031 B CN 110421031B
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- 238000005452 bending Methods 0.000 title claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000001125 extrusion Methods 0.000 claims abstract description 132
- 238000003825 pressing Methods 0.000 claims description 48
- 238000000465 moulding Methods 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000007704 transition Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 239000004033 plastic Substances 0.000 description 14
- 238000007493 shaping process Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
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- 239000004429 Calibre Substances 0.000 description 1
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- 238000013000 roll bending Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/21—Presses specially adapted for extruding metal
- B21C23/217—Tube extrusion presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- 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
-
- 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
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
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- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
The invention relates to the technical field of bent pipe manufacturing, and discloses a large-caliber thin-wall pipe bending machine and a thin-wall bent pipe manufacturing method. The pipe bending machine comprises a frame, an upper forming die and a lower forming die which are arranged at the front end of the frame, a pushing driving part and a rotating driving part which are arranged at the tail end of the frame, and a pushing assembly which is arranged between the upper forming die and the lower forming die and the pushing driving part and is connected with the pushing driving part and is used for pushing the thin-wall pipe forwards to enter an inner forming cavity of the upper forming die and the lower forming die, wherein a cantilever type rotating shaft is arranged on the rotating driving part, the cantilever end of the cantilever type rotating shaft is connected with an inner expansion type rotating extrusion head, the inner expansion type rotating extrusion head is positioned in an inner forming cavity of the upper forming die and the lower forming die, and the extrusion head on the inner expansion type rotating extrusion head is pressed against the inner wall of the thin-wall pipe during operation. The invention realizes the bending of the large-size ultrathin wall thickness pipe, reduces the die cost and improves the yield of the bent pipe.
Description
Technical Field
The invention relates to the technical field of bent pipe manufacturing, in particular to a large-caliber thin-wall pipe bending machine and a thin-wall bent pipe manufacturing method.
Background
The pipe bender is a device for bending pipes in a bending deformation mode. Typical tube bending machines include medium frequency push tube bending machines, roll bending machines, and draw tube bending machines.
The pipe bender in the prior art has the following problems when bending the bent pipe with the outer diameter of phi 168-phi 373mm, the wall thickness of 3mm and the bending radius of 1.5-3.5 m:
firstly, when the intermediate frequency pushing bending and rolling bending machine is used for bending the pipe fittings, the wall thickness is generally required to be more than 5mm, and the pipe fittings cannot be bent when the wall thickness is too small.
Secondly, the pipe bending machine needs to customize a central die, the equipment is huge, the die adjustment difficulty is high, and the pipe fitting yield is not guaranteed.
Therefore, the bending machine and the bending method thereof used in the prior art cannot bend the bent pipe with ultra-thin wall thickness, or cannot meet higher precision requirements although the bent pipe can be bent.
Disclosure of Invention
In order to solve the problems, the invention provides a large-caliber thin-wall pipe bending machine and a thin-wall pipe bending manufacturing method, which aim to realize bending of large-size ultrathin-wall pipes, reduce the die cost and improve the pipe bending yield. The specific technical scheme is as follows:
the utility model provides a heavy-calibre thin wall bending machine, includes the frame, sets up upper and lower shaping compound die of frame front end, set up propulsion drive part and the rotation drive part of frame tail end, set up upper and lower shaping compound die with propulsion drive part between and with propulsion drive part is connected be used for pushing forward the thin wall pipe get into the propulsion subassembly of the inside shaping chamber of upper and lower shaping compound die, be provided with the cantilever rotation axis on the rotation drive part, just the cantilever end of cantilever rotation axis is connected with the rotatory extrusion head of internal expansion, the rotatory extrusion head of internal expansion is located in the inside shaping chamber of upper and lower shaping compound die, and during operation extrusion head on the rotatory extrusion head of internal expansion press with on the inner wall of thin wall pipe.
The working principle of the equipment is as follows: the front end of the thin-wall pipe is arranged in an inner forming cavity of the upper and lower forming die-closing die, the inner expansion type rotary extrusion head is arranged in the thin-wall pipe and is axially positioned at the position of the inner forming cavity, and in the process of continuously pushing the thin-wall pipe into the cavities of the upper and lower forming die-closing die by the pushing driving part, the inner expansion type rotary extrusion head also rotates, zero-clearance extrusion is formed between the rotary extrusion head and the inner wall of the thin-wall pipe, so that the pipe wall is uniformly thick and thin, and an elbow with a certain arc radius is manufactured.
The arc radius of the bent pipe is formed by the joint action of plastic deformation caused by extrusion force applied by an internal expansion type rotary extrusion head to the inner wall of the pipe.
Because the internal expansion type rotary extrusion head with zero clearance is arranged in the thin-wall pipe, the wall thickness of the manufactured bent pipe is uniform, and the yield is high.
In addition, the inner wall of the thin-wall pipe is extruded by the internal expansion type rotary extrusion head, so that the plastic deformation of the thin-wall pipe is accelerated, and the bending efficiency is improved.
In addition, the propelling speed can be controlled through the propelling component, so that the internal expansion type rotary extrusion head can form extrusion spiral line tracks with different pitches on the inner wall of the thin-wall pipe, which is equivalent to controlling the density of plastic deformation points of the thin-wall pipe (the space between the extrusion spiral lines is small, the density of the plastic deformation points formed by extrusion of the rotary extrusion head to the pipe wall is large, the rebound quantity of the bent pipe after extrusion is small, the bending arc radius is small, and the bending arc radius is large otherwise), so that the bent pipe with different bending radii can be bent, the flexibility and the adaptability of the pipe bender are improved, the number of dies can be greatly reduced, and the manufacturing cost of the bent pipe is reduced.
In addition, through the fine adjustment of the advancing speed, the tolerance precision of the curvature radius of the bent pipe can be controlled, and the yield is improved.
In the invention, the upper and lower molding die assembly mold comprises an upper mold and a lower mold which are connected in an up-down involution manner, and the upper mold and the lower mold are involuted to form the inner molding cavity.
Preferably, the inner molding cavity of the upper and lower molding die assembly mold comprises a guide section inner circular cavity and an eccentric section inner circular cavity which are arranged adjacently along the axial direction, the guide section inner circular cavity is coaxially arranged with the cantilever type rotating shaft and the internal expansion type rotating extrusion head, and the eccentric section inner circular cavity is adjacent to the front end of the guide section inner circular cavity and is eccentrically arranged relative to the guide section inner circular cavity.
The upper and lower molding die-closing die adopts an eccentric structure of a die cavity, and bent pipes with different bending radiuses can be manufactured by setting different eccentric amounts.
Preferably, a transition section inner round die cavity is arranged between the guide section inner round die cavity and the eccentric section inner round die cavity, and the transition section inner round die cavity is a smooth transition section inner round die cavity or a hollowed-out transition section inner round die cavity.
As a preferable scheme of the propulsion driving component, the propulsion driving component comprises a speed-regulating hydraulic motor, the propulsion assembly comprises a propulsion trolley, a screw rod rotatably arranged between the upper molding die and the lower molding die and the propulsion driving component, and a pair of light bars fixedly arranged on two sides of the screw rod and parallel to the screw rod, the screw rod is driven by the speed-regulating hydraulic motor to rotate, the propulsion trolley realizes movement guidance along the propulsion direction through the pair of light bars, the propulsion trolley realizes propulsion movement along the propulsion direction through being connected with the screw rod, and the front end of the propulsion trolley is provided with a chuck for clamping an inner hole at the tail end of a thin-wall tube.
Preferably, the chuck is a three-jaw self-centering chuck.
As a preferable mode of the rotation driving part in the invention, the rotation driving part comprises a motor-driven speed reducing mechanism, and the cantilever type rotation shaft is coaxially connected with a rotation output shaft of the speed reducing mechanism.
As a preferable scheme of the internal expansion type rotary extrusion head, the internal expansion type rotary extrusion head comprises a rotary body connected with the cantilever type rotary shaft, a central gear rotationally arranged on the central axis of the rotary body, and three transmission gears rotationally arranged on the rotary body and meshed with the central gear, wherein the three transmission gears are distributed in a dispersed manner along the circumferential direction, two transmission gears are connected with eccentric pressing wheels which are eccentrically arranged, the other transmission gear is connected with eccentric extrusion wheels which are eccentrically arranged, the eccentric pressing wheels are axially positioned in the inner circle cavity of the guide section, and the eccentric extrusion wheels are axially positioned in the inner circle cavity of the eccentric section.
When the rotary extrusion device works, the eccentric pressing wheel is pressed against the part of the inner wall of the pipe body, which is positioned in the inner circular cavity of the guide section, and is used as a reference for rotary extrusion; the eccentric extrusion wheel is pressed against the inner wall of the pipe body at the position of the inner circular cavity of the eccentric section, thereby forming zero-clearance deformation extrusion and forming an extrusion spiral line on the inner wall of the pipe body. The positioning reference (the pressing position of the eccentric pressing wheel) is always positioned at the inner wall part of the pipe body before bending, so that the extruded bent pipe has uniform wall thickness and good circular arc degree.
Preferably, the outer circle of the eccentric extrusion wheel has a sharp-topped shape.
The eccentric extrusion wheel adopts a sharp-top structure, so that extrusion stress can be increased, and the pipe body can obtain larger plastic deformation.
As a further improvement, the large-caliber thin-wall pipe bending machine further comprises a remote control rod for remotely operating and adjusting the rotation angle of the central gear, the cantilever type rotating shaft is a hollow shaft, the remote control rod penetrates through an inner hole of the hollow shaft from the tail end of the cantilever type rotating shaft and then is connected with the central gear, and the remote control rod is locked at the tail end of the cantilever type rotating shaft through a locking screw.
By arranging the remote control lever, the internal expansion type rotary extrusion head is greatly convenient to open and close, so that the convenience of equipment operation is improved.
Compared with the drawing pipe bender in the prior art, the large-caliber thin-wall pipe bender is simpler in overall structure, does not need to customize a center die, and overcomes the defects of huge equipment, high die adjustment difficulty and low pipe yield of the traditional drawing pipe bender.
A manufacturing method of a thin-wall bent pipe of a large-caliber thin-wall pipe bending machine comprises the following process steps:
(1) And (5) die sinking: opening an upper and lower molding die closing die;
(2) Folding an extrusion head: the remote control rod connected with the central gear is rotated, so that the central gear on the internal expansion type rotary extrusion head drives the transmission gear to rotate for a certain angle, and the rotation of the transmission gear enables the two eccentric pressing wheels and one eccentric extrusion wheel connected with the transmission gear to eccentrically displace, and the eccentric pressing wheels and the eccentric extrusion wheel are folded towards the central axis direction of the rotating body;
(3) And (3) tubing: horizontally hoisting the thin-wall pipe, so that the thin-wall pipe moves from the front end to the tail end of the pipe bending machine, and the inner hole at the tail end of the thin-wall pipe penetrates into the rotary driving part and then is connected and fixed with a chuck on the pushing trolley, and the front end of the thin-wall pipe is positioned in an inner forming cavity of the lower die;
(4) And (3) die assembly: closing an upper molding die and a lower molding die, and fixing;
(5) Opening the extrusion head: the remote control rod connected with the central gear is reversely rotated, so that the central gear on the internal expansion type rotary extrusion head drives the transmission gear to rotate for a certain angle, the rotation of the transmission gear enables two eccentric pressing wheels and one eccentric extrusion wheel which are connected with the transmission gear to reversely and eccentrically shift, the eccentric pressing wheels and the eccentric extrusion wheel are opened towards the direction far away from the central axis of the rotating body, and the eccentric pressing wheels and the eccentric extrusion wheels are pressed against the inner wall of the thin-wall tube; the eccentric pressing wheel is pressed against the inner wall of a section of thin-wall pipe positioned at the inner circle cavity position of the guide section of the die, and the eccentric pressing wheel is pressed against the inner wall of a section of thin-wall pipe positioned at the inner circle cavity position of the eccentric section of the die, so that the inner wall of the thin-wall pipe generates extrusion deformation at the pressing position of the eccentric pressing wheel;
(6) Linkage extrusion: the speed-regulating hydraulic motor and the motor-driven speed reducing mechanism are started, an output shaft of the speed reducing mechanism drives a screw rod to rotate, the screw rod rotates to drive a pushing trolley to advance, meanwhile, the internal expansion type rotary extrusion head rotates, the pushing trolley props the thin-wall pipe and enables the thin-wall pipe to continuously advance in an internal forming cavity of the die, meanwhile, an eccentric extrusion wheel on the internal expansion type rotary extrusion head forms zero-clearance extrusion on the inner wall of the thin-wall pipe, the pipe wall is enabled to be uniform in thickness, and an elbow pipe with a certain arc radius is manufactured.
As an improvement of the manufacturing method of the bent pipe, the invention can adjust the arc radius of the bent pipe by adjusting the eccentric amount of the die and the pushing speed of the pushing trolley.
The beneficial effects of the invention are as follows:
firstly, the large-caliber thin-wall pipe bending machine and the manufacturing method of the thin-wall pipe are provided with the internal expansion type rotary extrusion head with zero clearance in the thin-wall pipe, and the manufactured pipe bending has uniform wall thickness and high yield.
Secondly, according to the large-caliber thin-wall pipe bending machine and the thin-wall pipe bending manufacturing method, the extrusion of the inner expansion type rotary extrusion head to the inner wall of the thin-wall pipe accelerates the plastic deformation of the thin-wall pipe, so that the bending efficiency is improved.
Thirdly, the large-caliber thin-wall pipe bending machine and the thin-wall pipe bending manufacturing method can control the pushing speed through the pushing component, so that the internal expansion type rotary extrusion head can form extrusion spiral line tracks with different pitches on the inner wall of the thin-wall pipe, which is equivalent to controlling the density of plastic deformation points of the thin-wall pipe (the plastic deformation points formed by extruding the pipe wall through the rotary extrusion head have large density when the interval of the extrusion spiral lines is small, the rebound amount of the extruded pipe is small, the bending arc radius is small, and conversely, the bending arc radius is large), thereby bending the pipe with different bending radii, improving the flexibility and the adaptability of the pipe bending machine, greatly reducing the number of dies, and further reducing the manufacturing cost of the pipe.
Fourth, the large-caliber thin-wall pipe bending machine and the thin-wall pipe bending manufacturing method can control the tolerance precision of the curvature radius of the pipe bending through fine adjustment of the pushing speed, and improve the yield.
Fifth, the invention relates to a large-caliber thin-wall pipe bending machine and a manufacturing method of thin-wall pipe bending, wherein an upper molding die and a lower molding die adopt eccentric structures of a cavity, and pipe bending with different bending radiuses can be manufactured by setting different eccentric amounts.
Sixthly, the eccentric pressing wheel is pressed against the part of the inner wall of the pipe body, which is positioned in the inner circular cavity of the guide section, as a reference of rotary extrusion when the large-caliber thin-wall pipe bending machine and the thin-wall pipe bending manufacturing method are operated; the eccentric extrusion wheel is pressed against the inner wall of the pipe body at the position of the inner circular cavity of the eccentric section, thereby forming zero-clearance deformation extrusion and forming an extrusion spiral line on the inner wall of the pipe body. The positioning reference (the pressing position of the eccentric pressing wheel) is always positioned at the inner wall part of the pipe body before bending, so that the extruded bent pipe has uniform wall thickness and good circular arc degree.
Seventh, according to the large-caliber thin-wall pipe bending machine and the manufacturing method of the thin-wall pipe bending, the eccentric extrusion wheel adopts the sharp-top structure, so that extrusion stress can be increased, and the pipe body can obtain larger plastic deformation.
Seventh, according to the large-caliber thin-wall pipe bending machine and the thin-wall pipe bending manufacturing method, the remote control rod is arranged, so that the expansion and the contraction of the internal expansion type rotary extrusion head are greatly facilitated, and the convenience of equipment operation is improved.
Eighth, compared with the drawing pipe bender in the prior art, the large-caliber thin-wall pipe bender and the manufacturing method of the thin-wall pipe bender provided by the invention have the advantages that the overall structure is simpler, a central die is not required to be customized, and the defects of huge equipment, high die adjustment difficulty and low pipe yield of the traditional drawing pipe bender are overcome.
Drawings
FIG. 1 is a schematic diagram of a large caliber thin wall pipe bender according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a right side view of FIG. 1;
FIG. 4 is a schematic view of the structure of an internal expansion rotary extrusion head and a cantilevered rotary shaft;
FIG. 5 is a schematic view of the structure of the inner molding cavity of the upper and lower molding closing mold;
FIG. 6 is a schematic three-dimensional structure of a large caliber thin wall pipe bender of the present invention.
In the figure: 1. the device comprises a frame, 2, an upper and lower forming die, 3, a pushing driving part, 4, a rotary driving part, 5, a thin-wall pipe, 6, a pushing assembly, 7, a cantilever type rotating shaft, 8, an internal expansion type rotary extrusion head, 9, an internal forming cavity, 10, a guiding section internal circular cavity, 11, an eccentric section internal circular cavity, 12, a transition section internal circular cavity, 13, a speed-regulating hydraulic motor, 14, a pushing trolley, 15, a screw rod, 16, a light bar, 17, a chuck, 18, a speed reducing mechanism, 19, a rotating output shaft of the speed reducing mechanism, 20, a rotating body, 21, a central gear, 22, a transmission gear, 23, an eccentric pressing wheel, 24, an eccentric pressing wheel, 25, a peak, 26, a remote control lever, 27 and a locking screw.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1:
referring to fig. 1 to 6, an embodiment of a large-caliber thin-wall pipe bender according to the present invention includes a frame 1, an upper and a lower molding dies 2 disposed at the front end of the frame 1, a push driving part 3 and a rotary driving part 4 disposed at the tail end of the frame 1, a push assembly 6 disposed between the upper and lower molding dies 2 and the push driving part 3 and connected with the push driving part 3 for pushing a thin-wall pipe 5 forward into an inner molding cavity 9 of the upper and lower molding dies 2, a cantilever type rotating shaft 7 is disposed on the rotary driving part 4, and a cantilever end of the cantilever type rotating shaft 7 is connected with an inner expansion type rotary extrusion head 8, the inner expansion type rotary extrusion head 8 is disposed in the inner molding cavity 9 of the upper and lower molding dies 2, and in operation, the extrusion head on the inner expansion type rotary extrusion head 8 is pressed against an inner wall of the thin-wall pipe 5.
The working principle of the equipment is as follows: the front end of the thin-wall pipe 5 is arranged in an inner forming cavity 9 of the upper and lower forming die assembly die 2, an inner expansion type rotary extrusion head 8 is arranged in the thin-wall pipe 5 and is axially positioned in the inner forming cavity 9, and in the process of continuously pushing the thin-wall pipe 5 into the cavity of the upper and lower forming die assembly die 2 through a pushing driving part 3, the inner expansion type rotary extrusion head 8 also rotates, zero clearance extrusion is formed between the rotary extrusion head and the inner wall of the thin-wall pipe 5, so that the pipe wall is uniformly thick and thin, and an elbow with a certain arc radius is manufactured.
The arc radius of the bent pipe is formed by the combined action of plastic deformation caused by extrusion force applied by the inner expansion type rotary extrusion head 8 to the inner wall of the pipe and the cavity shape of the upper and lower forming die closing dies.
Because the inner expansion type rotary extrusion head 8 with zero clearance is arranged in the thin-wall pipe 5, the wall thickness of the manufactured bent pipe is uniform, and the yield is high.
In addition, the extrusion of the inner wall of the thin-wall pipe 5 by the internal expansion type rotary extrusion head 8 accelerates the plastic deformation of the thin-wall pipe 5, thereby improving the bending efficiency.
In addition, the pushing speed can be controlled through the pushing component 6, so that the inner expansion type rotary extrusion head 8 can form extrusion spiral line tracks with different pitches on the inner wall of the thin-wall pipe 5, which is equivalent to controlling the density of plastic deformation points of the thin-wall pipe 5 (the space between the extrusion spiral lines is small, the density of the plastic deformation points formed by extrusion of the pipe wall by the rotary extrusion head 8 is large, the rebound quantity of the extruded bent pipe is small, the bending arc radius is small, and the bending arc radius is large on the contrary), so that bent pipes with different bending radii can be manufactured, the flexibility and the adaptability of the pipe bender are improved, the number of dies is greatly reduced, and the manufacturing cost of the bent pipe is reduced.
In addition, through the fine adjustment of the advancing speed, the tolerance precision of the curvature radius of the bent pipe can be controlled, and the yield is improved.
In this embodiment, the upper and lower molding closing mold 2 includes an upper mold and a lower mold which are connected in an up-down involution manner, and the upper mold and the lower mold form the inner molding cavity 9 after involution.
Preferably, the inner molding cavity 9 of the upper and lower molding die assembly 2 includes a guide section inner circular cavity 10 and an eccentric section inner circular cavity 11 which are disposed adjacent to each other in the axial direction, the guide section inner circular cavity 10 is disposed coaxially with the cantilever rotary shaft 7 and the internal expansion rotary extrusion head 8, and the eccentric section inner circular cavity 11 is disposed adjacent to the front end of the guide section inner circular cavity 10 and is eccentric with respect to the guide section inner circular cavity 10.
The upper and lower molding die-closing die 2 adopts an eccentric structure of a die cavity, and bent pipes with different bending radiuses can be manufactured by setting different eccentric amounts.
Preferably, a transition section inner circular cavity 12 is arranged between the guide section inner circular cavity 10 and the eccentric section inner circular cavity 11, and the transition section inner circular cavity 12 is a smooth transition section inner circular cavity or a hollowed-out transition section inner circular cavity.
As a preferred scheme of the propulsion driving component in this embodiment, the propulsion driving component 3 includes a speed-regulating hydraulic motor 13, the propulsion assembly 6 includes a propulsion trolley 14, a screw rod 15 rotatably disposed between the upper and lower molding die-closing dies 2 and the propulsion driving component 3, and a pair of bars 16 fixedly disposed on two sides of the screw rod 15 and parallel to the screw rod 15, the screw rod 15 is driven to rotate by the speed-regulating hydraulic motor 13, the propulsion trolley 14 realizes movement guidance along the propulsion direction through the pair of bars 16, the propulsion trolley 14 realizes propulsion movement along the propulsion direction through connecting the screw rod 15, and a chuck 17 for clamping an inner hole at the tail end of the thin-walled tube 5 is disposed at the front end of the propulsion trolley 14.
Preferably, the chuck 17 is a three-jaw self-centering chuck.
As a preferable mode of the rotation driving part 4 in the present embodiment, the rotation driving part 4 includes a motor-driven reduction mechanism 18, and the cantilever type rotation shaft 7 is coaxially connected with a rotation output shaft 19 of the reduction mechanism 18.
As a preferred scheme of the internal expansion rotary extrusion head 8 in this embodiment, the internal expansion rotary extrusion head 8 includes a rotary body 20 connected with the cantilever rotary shaft 7, a central gear 21 rotatably disposed on a central axis of the rotary body 20, and three transmission gears 22 rotatably disposed on the rotary body 20 and meshed with the central gear 21, the three transmission gears 22 are distributed in a dispersed manner along a circumferential direction, two transmission gears 22 among the three transmission gears 22 are connected with eccentric pressing wheels 23 eccentrically disposed, another transmission gear 22 is connected with eccentric pressing wheels 24 eccentrically disposed, the eccentric pressing wheels 23 are axially disposed in the guide section inner circular cavity 10, and the eccentric pressing wheels 24 are axially disposed in the eccentric section inner circular cavity 11.
When in operation, the eccentric pressing wheel 23 presses against the part of the inner wall of the pipe body, which is positioned in the inner circular cavity 10 of the guide section, and is used as a reference for rotary extrusion; the eccentric extrusion wheel 24 is pressed against the inner wall of the pipe body at the position of the eccentric section inner circle cavity 11, thereby forming zero-clearance deformation extrusion and forming an extrusion spiral line on the inner wall of the pipe body. The positioning reference (the pressing position of the eccentric pressing wheel 23) is always at the inner wall of the pipe body before bending, so that the extruded bent pipe has uniform wall thickness and good circular arc degree.
Preferably, the outer circumference of the eccentric extrusion wheel 24 has a shape of a sharp peak 25.
The eccentric extrusion wheel 24 adopts a sharp peak 25 structure, so that extrusion stress can be increased, and the pipe body can obtain larger plastic deformation.
As a further improvement, the heavy caliber thin wall pipe bender of the present embodiment further includes a remote control lever 26 for remote operation and adjusting the rotation angle of the central gear 21, the cantilever type rotation shaft 7 is a hollow shaft, the remote control lever 26 passes through the inner hole of the hollow shaft from the tail end of the cantilever type rotation shaft 7 and then is connected with the central gear 21, and the remote control lever 26 is locked at the tail end of the cantilever type rotation shaft 7 by a locking screw 27.
By providing the remote control lever 26, the expansion and contraction of the internal expansion type rotary extrusion head 8 are greatly facilitated, and thus the convenience of the operation of the device is increased.
Compared with the drawing pipe bender in the prior art, the large-caliber thin-wall pipe bender is simpler in overall structure, does not need to customize a center die, and overcomes the defects of huge equipment, high die adjustment difficulty and low pipe yield of the traditional drawing pipe bender.
Example 2:
the manufacturing method of the thin-wall bent pipe by adopting the large-caliber thin-wall bending machine of the embodiment 1 comprises the following process steps:
(1) And (5) die sinking: opening an upper and lower molding die closing die 2;
(2) Folding an extrusion head: the remote control lever 26 connected with the central gear 21 is rotated, so that the central gear 21 on the internal expansion rotary extrusion head 8 drives the transmission gear 22 to rotate for a certain angle, and the rotation of the transmission gear 22 causes the eccentric displacement of the two eccentric pressing wheels 23 and the eccentric extrusion wheel 24 connected with the transmission gear 22, and the eccentric pressing wheels 23 and the eccentric extrusion wheel 24 are folded towards the central axis direction of the rotary body 20;
(3) And (3) tubing: horizontally hoisting the thin-wall pipe 5, so that the thin-wall pipe 5 moves from the front end to the tail end of the pipe bending machine, and the tail end inner hole of the thin-wall pipe 5 penetrates into the rotary driving part 4 and then is connected and fixed with a chuck 17 on the pushing trolley 14, and the front end of the thin-wall pipe 5 is positioned in an inner forming cavity 9 of the lower die;
(4) And (3) die assembly: closing and fixing the upper and lower molding die closing dies 2;
(5) Opening the extrusion head: the remote control lever 26 connected with the central gear 21 is reversely rotated, so that the central gear 21 on the internal expansion type rotary extrusion head 8 drives the transmission gear 22 to rotate for a certain angle, the rotation of the transmission gear 22 enables two eccentric pressing wheels 23 and one eccentric extrusion wheel 24 connected with the transmission gear 22 to reversely eccentrically displace, the eccentric pressing wheels 23 and the eccentric extrusion wheel 24 are opened towards the direction far away from the central axis of the rotary body 20, and the eccentric pressing wheels 23 and the eccentric extrusion wheel 24 are pressed against the inner wall of the thin-wall tube 5; wherein, the eccentric pressing wheel 23 is pressed against the inner wall of the section of thin-wall tube 5 positioned at the position of the inner circle cavity 20 of the guiding section of the die, the eccentric pressing wheel 24 is pressed against the inner wall of the section of thin-wall tube 5 positioned at the position of the inner circle cavity 11 of the eccentric section of the die, and the inner wall of the thin-wall tube 5 generates extrusion deformation at the pressing position of the eccentric pressing wheel 24;
(6) Linkage extrusion: the speed-regulating hydraulic motor 13 and the motor-driven speed reducing mechanism 18 are started, an output shaft 19 of the speed reducing mechanism 18 drives a screw rod 15 to rotate, the screw rod 15 rotates to drive a pushing trolley 14 to advance, meanwhile, the internal expansion type rotary extrusion head 8 rotates, the pushing trolley 14 props against the thin-wall pipe 5 and enables the thin-wall pipe 5 to continuously advance in an internal forming cavity 9 of the die, meanwhile, an eccentric extrusion wheel 24 on the internal expansion type rotary extrusion head 8 forms zero clearance extrusion on the inner wall of the thin-wall pipe 5, the pipe wall is enabled to be uniform in thickness, and an elbow pipe with a certain arc radius is manufactured.
As an improvement of the method for manufacturing the bent pipe, the present embodiment can adjust the radius of the arc of the bent pipe by adjusting the eccentric amount of the die and the advancing speed of the advancing carriage 14.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (6)
1. The large-caliber thin-wall pipe bending machine is characterized by comprising a frame, an upper forming die and a lower forming die which are arranged at the front end of the frame, a pushing driving part and a rotating driving part which are arranged at the tail end of the frame, a pushing assembly which is arranged between the upper forming die and the lower forming die and the pushing driving part and is connected with the pushing driving part and is used for pushing a thin-wall pipe forwards to enter an inner forming cavity of the upper forming die and the lower forming die, wherein a cantilever type rotating shaft is arranged on the rotating driving part, the cantilever end of the cantilever type rotating shaft is connected with an inner expansion type rotating extrusion head, the inner expansion type rotating extrusion head is positioned in an inner forming cavity of the upper forming die and the lower forming die, and the extrusion head on the inner expansion type rotating extrusion head is pressed against the inner wall of the thin-wall pipe when in operation;
the propelling driving component comprises a speed-regulating hydraulic motor, the propelling component comprises a propelling trolley, a screw rod rotatably arranged between the upper molding die and the lower molding die and the propelling driving component, and a pair of feed screws fixedly arranged on two sides of the screw rod and parallel to the screw rod, the screw rod is driven to rotate by the speed-regulating hydraulic motor, the propelling trolley realizes moving guide along the propelling direction through the pair of feed screws, the propelling trolley realizes propelling movement along the propelling direction through being connected with the screw rod, and the front end of the propelling trolley is provided with a chuck for clamping an inner hole at the tail end of a thin-walled tube;
the rotary driving part comprises a motor-driven speed reducing mechanism, and the cantilever type rotary shaft is coaxially connected with a rotary output shaft of the speed reducing mechanism;
the internal expansion type rotary extrusion head comprises a rotary body connected with the cantilever type rotary shaft, a central gear rotationally arranged on the central axis of the rotary body, and three transmission gears rotationally arranged on the rotary body and meshed with the central gear, wherein the three transmission gears are distributed in a dispersed manner along the circumferential direction, two transmission gears among the three transmission gears are connected with eccentric pressing wheels which are eccentrically arranged, the other transmission gear is connected with eccentric pressing wheels which are eccentrically arranged, the eccentric pressing wheels are axially positioned in the inner circle cavity of the guide section, and the eccentric pressing wheels are axially positioned in the inner circle cavity of the eccentric section;
the remote control lever is used for remotely operating and adjusting the rotation angle of the central gear, the cantilever type rotating shaft is a hollow shaft, the remote control lever penetrates through an inner hole of the hollow shaft from the tail end of the cantilever type rotating shaft and then is connected with the central gear, and the remote control lever is locked at the tail end of the cantilever type rotating shaft through a locking screw.
2. The large-caliber thin-wall pipe bending machine according to claim 1, wherein the upper and lower molding die assembly dies comprise an upper die and a lower die which are connected in an up-down involution manner, and the upper die and the lower die are combined to form the inner molding cavity.
3. The large-caliber thin-wall pipe bending machine according to claim 1, wherein the inner forming cavity of the upper and lower forming die comprises a guide section inner circular cavity and an eccentric section inner circular cavity which are adjacently arranged along the axial direction, the guide section inner circular cavity is coaxially arranged with the cantilever type rotating shaft and the internal expansion type rotating extrusion head, and the eccentric section inner circular cavity is adjacent to the front end of the guide section inner circular cavity and is eccentrically arranged relative to the guide section inner circular cavity.
4. A heavy caliber thin wall pipe bending machine according to claim 3, wherein a transition section inner circle cavity is arranged between the guide section inner circle cavity and the eccentric section inner circle cavity, and the transition section inner circle cavity is a smooth transition section inner circle cavity or a hollowed-out transition section inner circle cavity.
5. A method for manufacturing a thin-wall bent pipe by using the large-caliber thin-wall bending machine as claimed in any one of claims 1 to 4, which is characterized by comprising the following process steps:
(1) And (5) die sinking: opening an upper and lower molding die closing die;
(2) Folding an extrusion head: the remote control rod connected with the central gear is rotated, so that the central gear on the internal expansion type rotary extrusion head drives the transmission gear to rotate for a certain angle, and the rotation of the transmission gear enables the two eccentric pressing wheels and one eccentric extrusion wheel connected with the transmission gear to eccentrically displace, and the eccentric pressing wheels and the eccentric extrusion wheel are folded towards the central axis direction of the rotating body;
(3) And (3) tubing: horizontally hoisting the thin-wall pipe, so that the thin-wall pipe moves from the front end to the tail end of the pipe bending machine, and the inner hole at the tail end of the thin-wall pipe penetrates into the rotary driving part and then is connected and fixed with a chuck on the pushing trolley, and the front end of the thin-wall pipe is positioned in an inner forming cavity of the lower die;
(4) And (3) die assembly: closing an upper molding die and a lower molding die, and fixing;
(5) Opening the extrusion head: the remote control rod connected with the central gear is reversely rotated, so that the central gear on the internal expansion type rotary extrusion head drives the transmission gear to rotate for a certain angle, the rotation of the transmission gear enables two eccentric pressing wheels and one eccentric extrusion wheel which are connected with the transmission gear to reversely and eccentrically shift, the eccentric pressing wheels and the eccentric extrusion wheel are opened towards the direction far away from the central axis of the rotating body, and the eccentric pressing wheels and the eccentric extrusion wheels are pressed against the inner wall of the thin-wall tube; the eccentric pressing wheel is pressed against the inner wall of a section of thin-wall pipe positioned at the inner circle cavity position of the guide section of the die, and the eccentric pressing wheel is pressed against the inner wall of a section of thin-wall pipe positioned at the inner circle cavity position of the eccentric section of the die, so that the inner wall of the thin-wall pipe generates extrusion deformation at the pressing position of the eccentric pressing wheel;
(6) Linkage extrusion: the speed-regulating hydraulic motor and the motor-driven speed reducing mechanism are started, an output shaft of the speed reducing mechanism drives a screw rod to rotate, the screw rod rotates to drive a pushing trolley to advance, meanwhile, the internal expansion type rotary extrusion head rotates, the pushing trolley props the thin-wall pipe and enables the thin-wall pipe to continuously advance in an internal forming cavity of the die, meanwhile, an eccentric extrusion wheel on the internal expansion type rotary extrusion head forms zero-clearance extrusion on the inner wall of the thin-wall pipe, the pipe wall is enabled to be uniform in thickness, and an elbow pipe with a certain arc radius is manufactured.
6. The method for manufacturing a thin-wall bent pipe of a large-caliber thin-wall pipe bender according to claim 5, wherein the radius of the arc of the bent pipe is adjusted by adjusting the eccentric amount of the mold and the pushing speed of the pushing trolley.
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| CN201910729008.4A CN110421031B (en) | 2019-08-08 | 2019-08-08 | Large-caliber thin-wall pipe bending machine and thin-wall pipe bending manufacturing method |
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| DE202006001511U1 (en) * | 2006-02-01 | 2006-03-23 | Yih Shen Machiner Co., Ltd., Wuri Shiang | Pipe and cable bending machine has first servo-motor rotating eccentric shaft, on which cantilever arm is mounted carrying cutter, second servo-motor moving cutter and three additional servo-motors controlling movement of bending tools |
| CN106475445A (en) * | 2016-11-08 | 2017-03-08 | 南京航空航天大学 | A kind of metal pipe material 3D free bend manufacturing process and five axle free bend equipment |
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