CN103008419A - Forming device and forming method for pipe with small bending radius - Google Patents
Forming device and forming method for pipe with small bending radius Download PDFInfo
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- CN103008419A CN103008419A CN2012105353373A CN201210535337A CN103008419A CN 103008419 A CN103008419 A CN 103008419A CN 2012105353373 A CN2012105353373 A CN 2012105353373A CN 201210535337 A CN201210535337 A CN 201210535337A CN 103008419 A CN103008419 A CN 103008419A
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Abstract
The invention discloses a forming device and a forming method for a pipe with a small bending radius, and relates to a pipe forming device and a pipe forming method. With the adoption of the forming device and the forming method, the shortage of the existing forming technology of the pipe with the small bending radius is overcome. The scheme of the device is as follows: one end of a second mandrel is arranged in a first tube blank; the other end of the second mandrel is arranged in a second tube blank; one end of a first mandrel is arranged in the first tube blank; one end of a third mandrel is arranged in the second tube blank; the other end of the first mandrel is arranged in a first punch; the other end of the third mandrel is arranged in a second punch; the first tube blank, the second tube blank, the first punch and the second punch are arranged in a mould cavity; and a second mandrel positioning bulge is arranged in a corresponding ring groove. The scheme of the method comprises a filling stage and a forming stage. The forming device and the forming method are used for pipe forming.
Description
Technical field
The present invention relates to a kind of pipe building mortion and manufacturing process.
Background technology
The part that adopts bending pipes to make as the gas liquid transfer pipeline, is widely used in Aero-Space, the fields such as automobile.The development of unmanned plane and small aero technology is had higher requirement for the aspect, space of aluminium alloy, titanium alloy and high temperature alloy bending pipe fitting.Adopt integrally formed small bend radius tube, both can conserve space, guarantee again reliability of structure and realize the loss of weight of member.Relative bending radius is one of important indicator of Tube Bending Deformation degree, and relative bending radius is the radius R of pipe fitting bending neutral layer and the ratio of pipe diameter D.There is the limit in bending process relative bending radius under the tradition tension and compression deformation mechanism, this is because reducing along with relative bending radius, the pipe bending part outside excessive thinning even cracking under the effect of two-way tension, bool inboard under the effect of Bidirectional pressure stress, thicken in addition unstability wrinkling.When relative bending radius was reduced to a certain degree, the crooked interior outside was difficult to coordinate, and finally causes tubing to be shaped.Actual minimum relative bending radius not only depends on bending process (core, equipment), also depends on the radius-thickness ratio of tubing, the mechanical property of material etc.
, be difficult to realize without chip bending less than 3 pipe fitting for relative bending radius.Compared to without chip bending, adopt inner support can effectively alleviate the wrinkling and cross section distortion of pipe fitting, improve the bending forming limit.From filler kind angle, can be divided into that the rigidity core is supported with chip bending and flexible media is supported with chip bending.At present commonly used have numerical-control bending (CNC is crooked) rigidity core to be supported with chip bending and interior pressure to push away the flexible media such as curved, liquid filled shear bending and be supported with chip bending.
Numerical-control bending: numerical-control bending is that tradition is gone for a stroll technique in conjunction with a kind of advanced tube plastic forming technology that machine tool industry and Numeric Control Technology grow up, and is one of the most frequently used plastic bending technique of the field thin-winding pipe members such as present Aeronautics and Astronautics and automobile.Numerical control bending forming has comprised many groups mould constraint Collaborative Control pipe fitting deformational behavior, can better control cross section distortion and the defective such as wrinkling, increases the tube bending forming limit, is suitable for the light-wall pipe small-bend radius and is shaped.Affect the many factors that the thin-winding pipe numerical-controlled bending is shaped, the lubricating condition between plug size and overhang, core print form and number, boosting speed, die clearance, rate of bending, clamping force and the each several part all has material impact to the forming quality of thin-winding pipe.Its relative bending radius of numerical-control bending with core can reach 1.5 generally speaking, adopts the certain moduli lamps structures such as many balls core, wrinkle resistant, can reach 1.2.
Interior pressure pushes away curved: push away can the be shaped pipe fitting of small-bend radius of o ing, relative bending radius can reach 1～2 usually.In order to prevent the distortion of pipe fitting section configuration, can adopt the polyurethane rod to support in bend pipe inside, external thrust is by plug elasticity of compression plug, and polyurethane rod and light-wall pipe down sliding under the punch impetus produces bending forming.Light-wall pipe is tightly reclined and concave die cavity by the expansive force that the polyurethane rod produces, and reduces wrinkling trend and cross section distortion.This bending process is applicable to that bending radius is less, the processing of the short and small bend pipe that do not have straightway, and the I of relative bending radius reaches 1.0.
Topping up is cut curved: the liquid filled shear bending method that Harbin Institute of Technology fluid power shaping project center proposes, and rely on detrusion to produce Material Flow and realize crookedly, the relative bending radius that can be shaped is less than 0.5 aluminium alloy and titanium alloy tube joint.But utilize liquid medium that interior pressure is provided, need special equipment, performance difficulty, equipment investment is large.The fillet size that is shaped depends primarily on internal pressure, is difficult to realize accurate quantitatively control.In addition, the raising of interior pressure has increased the Normal compressive stress of tube wall, can cause the increase of frictional force between tubing and the mould.When the shaping fillet was very little, pressure was very large in the required shaping, and friction can be more outstanding to the adverse effect of forming accuracy.
Adopt symmetrical mandrel to replace liquid and support when can effectively address the above problem, still utilize the mechanism shaping small bend radius tube of detrusion, accurately control bending forming fillet size, the reduction technology is used difficulty, enhances productivity.
Summary of the invention
The purpose of this invention is to provide a kind of small bend radius tube building mortion and manufacturing process, to overcome the deficiency of existing small bend radius tube forming technique.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: the device scheme: device comprises the first drift, the first cylinder, the second cylinder, the three cylindrical body, first cuts into the core head, the 3rd cuts into core head and two second cuts into the core head, the second drift, active module, upper solid model and lower solid model have consisted of stuck-module, stuck-module is rectangular shape, the cross section of active module is T shape, the stuck-module through-thickness has the first through hole that is complementary with active module, stuck-module has the second through hole along its length, vertical section bottom of active module has third through-hole, active module is located in the first through hole and the second through hole and third through-hole have consisted of mold cavity, the sidewall of third through-hole is along having annular groove
First cuts into the core head, second cuts into core head and the 3rd cuts into the end rounding that the core head is semicylinder and semicylinder, a first cylindrical end is connected with first other end that cuts into the core head makes the first axle, first cuts into the core head is positioned at the first cylindrical first half and first and cuts into the plane of core head and the first cylindrical central axis plane at grade, the second cylindrical two ends are connected with second end that cuts into the core head respectively makes the second axle, two second cut into the core head and are positioned at the second cylindrical Lower Half and two second and cut into the plane of core head and the second cylindrical central axis plane at grade, the second cylinder is provided with positioning convex, the end that one end and the 3rd of three cylindrical body cuts into the core head is connected makes the 3rd axle, and the 3rd cuts into central axis plane that the first half and the 3rd that the core head is positioned at the three cylindrical body cuts into the plane of core head and three cylindrical body at grade;
One end of the second axle is contained in the first pipe, the other end of the second axle is contained in the second pipe, one end of the first axle is contained in the first pipe and first cuts into core head and second and cut into the core head and be oppositely arranged, one end of the 3rd axle is contained in the second pipe and the 3rd cuts into core head and second and cut into the core head and be oppositely arranged, the other end of the first axle is contained in the first drift, and the other end of the 3rd axle is contained in the second drift;
The first pipe and the second pipe, the first drift and the second drift all are located in the mold cavity, and the second axle positioning convex is located in the corresponding annular groove;
Method scheme: small bend radius tube manufacturing process: step 1, filling stage: with the first mandrel, after the second mandrel and the combination of the 3rd mandrel, put in the first pipe and the second pipe at the first mandrel and the 3rd mandrel outside, put into the mold cavity that is formed by stuck-module and active module, by the positioning convex on the second mandrel and active module location, at the first pipe and the second pipe two ends the first drift and the second drift are installed respectively, the first drift and the second drift inwardly advance vertically, the first drift contacts with the first pipe, and the second drift contacts with the second pipe;
Description of drawings
Fig. 1 is overall structure front view of the present invention, and Fig. 2 is the A-A profile (original state) of Fig. 1, and Fig. 3 is the structural representation after pipe is shaped, Fig. 4 is the B point enlarged drawing of Fig. 3, Fig. 5 is the first mandrel schematic diagram, and Fig. 6 is the schematic diagram of the second mandrel, and Fig. 7 is the schematic diagram of the 3rd mandrel.
The present invention has following beneficial effect: the present invention is utilizing detrusion mechanism to realize utilizing symmetrical mandrel as inner support in the tube bending forming, not only utilize the method for symmetrical control effectively to reduce the enforcement difficulty that axial supplement and tangential displacement are moved simultaneously, and realize the accurate control of curved radius size.The shaping pipe fitting has the characteristics such as relative bending radius is little, surface quality good, forming accuracy is high, overall performance is good, can machined steel, the metal and alloy materials such as aluminium, copper, titanium, but also processing part nonmetallic materials are particularly suitable for the monolithic molding of the pipe fitting of relative bending radius below 0.5.
The specific embodiment
The specific embodiment one: present embodiment is described in conjunction with Fig. 1-Fig. 7, the device of present embodiment comprises the first drift 3, the first cylinder 4-1, the second cylinder 5-1, three cylindrical body 6-1, first cuts into core head 4-2, the 3rd cuts into core head 6-2 and two second cuts into core head 5-2, the second drift 8, active module 9, upper solid model and lower solid model have consisted of stuck-module 1, stuck-module 1 is rectangular shape, the cross section of active module 9 is T shape, stuck-module 1 through-thickness has the first through hole 1-1 that is complementary with active module 9, stuck-module 1 has the second through hole 1-2 along its length, vertical section bottom of active module 9 has third through-hole 9-1, active module 9 is located in the first through hole 1-1 and the second through hole 1-2 and third through-hole 9-1 have consisted of mold cavity, the sidewall of third through-hole 9-1 is along having annular groove 9-2
First cuts into core head 4-2, second cuts into core head 5-2 and the 3rd cuts into the end rounding that core head 6-2 is semicylinder and semicylinder, the other end that the end of the first cylinder 4-1 and first cuts into core head 4-2 is connected makes the first axle 4, first cuts into central axis plane that the first half and first that core head 4-2 is positioned at the first cylinder 4-1 cuts into the plane of core head 4-2 and the first cylinder 4-1 at grade, the two ends of the second cylinder 5-1 are connected with second end that cuts into core head 5-2 respectively makes the second axle 5, two second cut into central axis plane that core head 4-2 is positioned at the Lower Half of the second cylinder 5-1 and two second planes that cut into core head 4-2 and the second cylinder 5-1 at grade, the second cylinder 5-1 is provided with positioning convex 5-3, the end that the end and the 3rd of three cylindrical body 6-1 cuts into core head 6-2 is connected to be made the 3rd axle 6, the three and cuts into central axis plane that the first half and the 3rd that core head 6-2 is positioned at three cylindrical body 6-1 cuts into the plane of core head 6-2 and three cylindrical body 6-1 at grade;
One end of the second axle 5 is contained in the first pipe 2, the other end of the second axle 5 is contained in the second pipe 8, one end of the first axle 4 is contained in the first pipe 2 and first cuts into core head 4-2 and second and cut into core head 5-2 and be oppositely arranged, one end of the 3rd axle 6 is contained in the second pipe 8 and the 3rd cuts into core head 6-2 and second and cut into core head 5-2 and be oppositely arranged, the other end of the first axle 4 is contained in the first drift 3, and the other end of the 3rd axle 6 is contained in the second drift 7;
The first pipe 2 and the second pipe 8, the first drift 3 and the second drift 7 all are located in the mold cavity, and the second axle 5 positioning convex 5-3 are located among the corresponding annular groove 9-3.
The specific embodiment two: in conjunction with Fig. 1 present embodiment is described, first of present embodiment cuts into core head 4-2, second and cuts into core head 5-2 and the 3rd and cut into core head 6-2 rounding R≤D/2, and wherein D is the diameter of pipe.Other embodiment is identical with the specific embodiment one.
The specific embodiment three: the small bend radius tube manufacturing process of present embodiment: step 1, filling stage: with the first mandrel 4, after the second mandrel 5 and 6 combinations of the 3rd mandrel, put in the first pipe 2 and the second pipe 8 at the first mandrel 4 and the 3rd mandrel 6 outsides, put into the mold cavity that is formed by stuck-module 1 and active module 9, by the positioning convex on the second mandrel 5 and active module 9 location, at the first pipe 2 and the second pipe 8 two ends the first drift 3 and the second drift 7 are installed respectively, the first drift 3 and the second drift 7 inwardly advance vertically, the first drift 3 contacts with the first pipe 2, and the second drift 7 contacts with the second pipe 8;
The specific embodiment four: the tangential displacement S of present embodiment
2Equal axial displacement S
1, the axial supplement of assurance drift, other embodiment is identical with the specific embodiment one.
Claims (4)
1. small bend radius tube building mortion, it is characterized in that described device comprises the first drift (3), the first cylinder (4-1), the second cylinder (5-1), three cylindrical body (6-1), first cuts into core head (4-2), the 3rd cuts into core head (6-2), the second drift (8), active module (9) and two second cut into core head (5-2), upper solid model and lower solid model have consisted of stuck-module (1), stuck-module (1) is rectangular shape, the cross section of active module (9) is T shape, stuck-module (1) through-thickness has the first through hole (1-1) that is complementary with active module (9), stuck-module (1) has the second through hole (1-2) along its length, vertical section bottom of active module (9) has third through-hole (9-1), active module (9) is located in the first through hole (1-1) and the second through hole (1-2) and third through-hole (9-1) have consisted of mold cavity, the sidewall of third through-hole (9-1) is along having annular groove (9-2), annular groove (9-2) is square groove
First cuts into core head (4-2), second cuts into core head (5-2) and the 3rd cuts into the end rounding that core head (6-2) is semicylinder and semicylinder, the other end that one end of the first cylinder (4-1) and first cuts into core head (4-2) is connected makes the first mandrel (4), first cuts into SMIS axial plane that the first half and first that core head (4-2) is positioned at the first cylinder (4-1) cuts into the plane of core head (4-2) and the first cylinder (4-1) at grade, the two ends of the second cylinder (5-1) are connected with second end that cuts into core head (5-2) respectively makes the second mandrel (5), two second cut into SMIS axial plane that core head (5-2) is positioned at the Lower Half of the second cylinder (5-1) and two second planes that cut into core head (5-2) and the second cylinder (5-1) at grade, the second cylinder (5-1) is provided with positioning convex (5-3), the end that one end and the 3rd of three cylindrical body (6-1) cuts into core head (6-2) is connected makes the 3rd mandrel (6), and the 3rd cuts into SMIS axial plane that the first half and the 3rd that core head (6-2) is positioned at three cylindrical body (6-1) cuts into the plane of core head (6-2) and three cylindrical body (6-1) at grade;
One end of the second mandrel (5) is contained in the first pipe (2), the other end of the second mandrel (5) is contained in the second pipe (8), one end of the first mandrel (4) is contained in the first pipe (2) and first cuts into core head (4-2) and second and cut into core head (5-2) and be oppositely arranged, one end of the 3rd mandrel (6) is contained in the second pipe (8) and the 3rd cuts into core head (6-2) and second and cut into core head (5-2) and be oppositely arranged, the other end of the first mandrel (4) is contained in the first drift (3), and the other end of the 3rd mandrel (6) is contained in the second drift (7);
The first pipe (2) and the second pipe (8), the first drift (3) and the second drift (7) all are located in the mold cavity, and the positioning convex (5-3) of the second mandrel (5) is located in the corresponding annular groove (9-2).
2. described small bend radius tube building mortion according to claim 1, it is characterized in that first cuts into core head (4-2), second and cut into core head (5-2) and the 3rd and cut into core head (6-2) rounding (R)≤D/2, wherein D is the diameter of pipe.
3. small bend radius tube manufacturing process that utilizes the described device of claim 1: step 1, filling stage: with the first mandrel (4), after the second mandrel (5) and the 3rd mandrel (6) combination, put in the first pipe (2) and the second pipe (8) at the first mandrel (4) and the 3rd mandrel (6) outside, put into the mold cavity that is formed by stuck-module (1) and active module (9), by the positioning convex on the second mandrel (5) and active module (9) location, at the first pipe (2) and the second pipe (8) two ends the first drift (3) and the second drift (7) are installed respectively, the first drift (3) and the second drift (7) inwardly advance vertically, the first drift (3) contacts with the first pipe (2), and the second drift (7) contacts with the second pipe (8);
Step 2, shaping stage: make active module (9) do tangential motion with respect to stuck-module (1) along the second mandrel (5), tangential displacement is S
2, simultaneously respectively vertically inwardly feeding of the first drift (3) and the second drift (8), axial displacement is S
1, the first pipe (2) and the second pipe (8) are deformed, prepare relative bending radius (R
bThe small-bend radius pipe fitting of)≤0.5.
4. described small bend radius tube manufacturing process according to claim 3 is characterized in that tangential displacement (S
2) equal axial displacement (S
1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105353373A CN103008419A (en) | 2012-12-12 | 2012-12-12 | Forming device and forming method for pipe with small bending radius |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105353373A CN103008419A (en) | 2012-12-12 | 2012-12-12 | Forming device and forming method for pipe with small bending radius |
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| CN103008419A true CN103008419A (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012105353373A Pending CN103008419A (en) | 2012-12-12 | 2012-12-12 | Forming device and forming method for pipe with small bending radius |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513510A (en) * | 2016-11-25 | 2017-03-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Small radius forming tool for large-diameter guide tube |
| CN106903194A (en) * | 2017-03-09 | 2017-06-30 | 南京航空航天大学 | A kind of method for improving the metal 3 D auto bending forming limit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3328996A (en) * | 1963-02-20 | 1967-07-04 | Tno | Device and method for manufacturing elbow fittings from straight tubing |
| JPH07328726A (en) * | 1994-06-06 | 1995-12-19 | Unisia Jecs Corp | Method for bending pipe and device therefor |
| US5483809A (en) * | 1993-02-15 | 1996-01-16 | Usui Kokusai Sangyo Kaisha Ltd. | Process for bending a metal tube to a small radius of curvature and a bent metal tube |
| EP1097755A1 (en) * | 1999-01-21 | 2001-05-09 | Sango Co., Ltd. | Bending method for pipe material |
| JP2002239639A (en) * | 2001-02-14 | 2002-08-27 | Sankei Kogyo Kk | Method and device for bending pipe |
| DE102004044755B3 (en) * | 2004-09-16 | 2006-06-01 | Thyssenkrupp Steel Ag | Bending device to form Z-section bends in thin-walled tubes has each inner mandrel divided into two axially offset halves |
| WO2008093818A1 (en) * | 2007-01-29 | 2008-08-07 | Sanoh Industrial Co., Ltd. | Bending method of pipe material and core bar for bending pipe material |
| CN101537447A (en) * | 2009-04-15 | 2009-09-23 | 哈尔滨工业大学 | Pipe liquid filled shear bending and forming method |
-
2012
- 2012-12-12 CN CN2012105353373A patent/CN103008419A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3328996A (en) * | 1963-02-20 | 1967-07-04 | Tno | Device and method for manufacturing elbow fittings from straight tubing |
| US5483809A (en) * | 1993-02-15 | 1996-01-16 | Usui Kokusai Sangyo Kaisha Ltd. | Process for bending a metal tube to a small radius of curvature and a bent metal tube |
| JPH07328726A (en) * | 1994-06-06 | 1995-12-19 | Unisia Jecs Corp | Method for bending pipe and device therefor |
| EP1097755A1 (en) * | 1999-01-21 | 2001-05-09 | Sango Co., Ltd. | Bending method for pipe material |
| JP2002239639A (en) * | 2001-02-14 | 2002-08-27 | Sankei Kogyo Kk | Method and device for bending pipe |
| DE102004044755B3 (en) * | 2004-09-16 | 2006-06-01 | Thyssenkrupp Steel Ag | Bending device to form Z-section bends in thin-walled tubes has each inner mandrel divided into two axially offset halves |
| WO2008093818A1 (en) * | 2007-01-29 | 2008-08-07 | Sanoh Industrial Co., Ltd. | Bending method of pipe material and core bar for bending pipe material |
| CN101537447A (en) * | 2009-04-15 | 2009-09-23 | 哈尔滨工业大学 | Pipe liquid filled shear bending and forming method |
Non-Patent Citations (1)
| Title |
|---|
| 夏东强 等: "基于有限元模拟的管材剪切弯曲工艺分析", 《模具工业》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513510A (en) * | 2016-11-25 | 2017-03-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Small radius forming tool for large-diameter guide tube |
| CN106903194A (en) * | 2017-03-09 | 2017-06-30 | 南京航空航天大学 | A kind of method for improving the metal 3 D auto bending forming limit |
| CN106903194B (en) * | 2017-03-09 | 2018-09-14 | 南京航空航天大学 | A method of improving the metal 3 D auto bending forming limit |
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Application publication date: 20130403 |