CN109807567B - A method of improving 1D and following small-bend radius pipe bend straight end length - Google Patents
A method of improving 1D and following small-bend radius pipe bend straight end length Download PDFInfo
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- CN109807567B CN109807567B CN201910206169.5A CN201910206169A CN109807567B CN 109807567 B CN109807567 B CN 109807567B CN 201910206169 A CN201910206169 A CN 201910206169A CN 109807567 B CN109807567 B CN 109807567B
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Abstract
The invention discloses a kind of raising 1D and the methods of following small-bend radius pipe bend straight end length, include the following steps, S1: designing the shape of pipe；S2: it carries out pushing away o ing for the first time；S3: the bend pipe for pushing away o ing for the first time is optimized；S4: the bend pipe for pushing away o ing for the first time is put into heating furnace and is made annealing treatment；S5: o ing is pushed away for the second time.The present invention passes through the method for pushing away o ing twice or repeatedly pushing away o ing, solve the problems, such as that straight end length is short before once pushing away o ing 1D and following small-bend radius pipe bend, the problem of straight end inner tube wall is easy to produce rupture before once-forming elbow in the process is overcome, is conducive to expand the application range for pushing away o ing 1D and following small-bend radius pipe bend.
Description
Technical field
The present invention relates to tube bending forming technical fields, more particularly to a kind of raising 1D and following small bend radius tube
The method of elbow straight end length.
Background technique
In modern Aviation, space flight, auto industry etc., in order to achieve the purpose that mitigate weight and save the useful space, largely
Using 1D and small bend radius tube below (D: the outer diameter of tubing).1D small bend radius tube, that is, bending radius (R) is equal to tubing
The bend pipe of outer diameter (D).1D and following small bend radius tube are mainly shaped using curved method is pushed away, and push away the bend pipe of o ing as schemed
Shown in 1, the thrust being subject on the outside of elbow curvature counteracts the curved tensile stress in outside, avoids outside and is generated by pulling force seriously
It is thinned or ruptures；Curved interior is squeezed, and is easy to cause the material stacking of curved interior and is wrinkled, so pushing away o ing
Rectilinear end a in front of 90 ° of eyesight elbows is very short.It is largely tested it is found that being managed if pushing away bending method using current by increasing
The primary push-in stroke of base increases the length of elbow rectilinear end a, and inner side of elbow front port is easily broken.Therefore, it pushes away at present curved
Method in order to avoid inner side of elbow port rupture, do not considered further that after shaping 90 ° of bend pipes and pipe continued toward being pushed forward
To increase the rectilinear end length of elbow.But in practical applications before rectilinear end it is more long be conducive to welding and with other parts
It is directly connected to.
It is CN201710024648.6, proprietary term that tubing applied by the application, which pushes away o ing equipment referring to number of patent application,
Referred to as a kind of small curvature bending radius L type thin-wall aluminum alloy bend pipe of band pushes away the Chinese patent of o ing method.
Summary of the invention
The object of the present invention is to provide a kind of raising 1D and the methods of following small-bend radius pipe bend straight end length, with solution
Certainly the above-mentioned problems of the prior art extends the welding surplus of elbow, improves the precision and intensity of welding, expands small
The application range of bending radius pipe.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of raising 1D and the methods of following small-bend radius pipe bend straight end length, including following step
Suddenly,
S1: the shape of pipe is designed
Pipe is cut, and symmetrically cuts off limb at pipe both ends, makes one end triangular shape of pipe port, pipe end
The trapezoidal shape of the other end of mouth, polishing pipe both ends eliminate burr, clean the grease stain of pipe inside and outside wall；
S2: it carries out pushing away o ing for the first time
Pipe is mounted on tubing to push away in o ing equipment, cavity plate is fixed on the table, formed punch is connect with featured cylinder,
Mandrel is connect with the anti-cylinder that pushes away, and the surface of the type chamber of cavity plate symmetrical above and below and pipe is lubricated processing, will be filled out equipped with elasticity
The pipe of block is symmetrically placed in the type chamber of cavity plate about molding interface, and starting tubing pushes away o ing equipment, and formed punch pushes pipe
The initial position of forming is advanced to, then mandrel advances to the type chamber bending section of cavity plate, and molding back punching head is by the push-in row being arranged
Cheng Qian proceeds to stopping, and for a period of time, formed punch and mandrel retreat a distance, and die sinking is taken out pushes away the curved of o ing for the first time for pressure maintaining
Pipe；
S3: the bend pipe for pushing away o ing for the first time is optimized
The bend pipe for pushing away o ing for the first time is cut into the limb with the pipe end of punch. contact, reverts to the bend pipe of trapezoidal shape
Port, then bend pipe is bowed out into straight line tip cut；
S4: the bend pipe for pushing away o ing for the first time is put into heating furnace and is made annealing treatment；
S5: o ing is pushed away for the second time
The pipe end for the bend pipe for pushing away o ing for the first time is cut and made annealing treatment, the first time being disposed
The bend pipe for pushing away o ing fills up elastic fill block and puts back to the position for pushing away o ing for the first time, and the elastic fill block of mandrel and elbow is straight
Contact, molding back punching head advance to the stroke of setting, and for a period of time, formed punch and mandrel retreat a distance for pressure maintaining, die sinking
Take out the bend pipe for pushing away o ing for the second time.
Preferably, it if pushing away straight end length before the elbow of the bend pipe of o ing for the second time is unable to meet demand, repeats second
The operation of o ing is pushed away, progress repeatedly pushes away o ing, until meet demand.
Preferably, the diameter of pipe is D, wall thickness t, the outer arc length L >=6D of pipe in step S1.
Preferably, the limb that pipe is cut off in step S1 is 45 ° -60 °.
Preferably, clearance fit between the pipe port and formed punch of trapezoidal shape in step S2.
Preferably, the bending angle of mandrel is 45 ° -60 ° in step S2.
Preferably, the dwell time in step S2 and S5 is 4-6 seconds.
Preferably, the distance that formed punch and mandrel retreat in step S2 and S5 is 15-25mm.
Preferably, the temperature of the annealing in step S4 and S5 is 360-400 DEG C, soaking time 80-100min.
Preferably, the pipe is thin-wall aluminum alloy pipe.
The present invention achieves following technical effect compared with the existing technology:
1, by push away o ing twice or repeatedly push away o ing method, solve and once push away o ing 1D and following small curved
The short problem of straight end length before bilge radius pipe bend overcomes the straight end inner tube wall before once-forming elbow in the process and is easy to produce
The problem of raw rupture, is conducive to expand the application range for pushing away o ing 1D and following small-bend radius pipe bend.
2, to push away every time it is curved before carry out the optimization design of pipe shape, improve bend pipe intrados region material and bend through pushing away
Accumulation in journey improves material flowability energy, is conducive to the increase of straight end length before elbow.
3, the o ing bend pipe pipe fitting that pushes away later for the first time is made annealing treatment, advantageously reduces the hardness of bend pipe pipe fitting
And residual stress is eliminated, the plasticity of material is improved, increases material ductility and toughness, reduces the resistance of deformation material of material
Material, raising is subsequent to push away o ing ability.
4, it repeatedly pushes away o ing to carry out on same mold, is saved greatly mold manufacture and production cost.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of 1D small bend radius tube；
Fig. 2 is the structural schematic diagram of pipe of the present invention；
Fig. 3 is to push away o ing schematic diagram before pushing away o ing progress first time of the invention；
Fig. 4 is to push away o ing schematic diagram after pushing away o ing progress first time of the invention；
Fig. 5 is the structural schematic diagram that the present invention pushes away the bend pipe after o ing for the first time；
Fig. 6 is the structural schematic diagram after the present invention optimizes the bend pipe of first time forming；
Fig. 7 is that the present invention is pushed away push away o ing schematic diagram before o ing for the second time；
Fig. 8 is that the present invention is pushed away push away o ing schematic diagram after o ing for the second time；
Fig. 9 is the structural schematic diagram that the present invention pushes away the bend pipe after o ing for the second time；
Wherein: 1- formed punch, guide sleeve before 2-, 3- elasticity fill block, 4- pipe, 5- cavity plate, 6- mandrel, guide sleeve after 7-.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art under the premise of not making the creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
In the description of the present invention it is to be appreciated that term " on ", "lower", " left side " and " right side " instruction orientation or position
Relationship is orientation and positional relationship based on the figure, it is only for facilitate the structurally and operationally mode of description, rather than
Indicating or imply signified part must have a particular orientation, with the operation of specific orientation, thus should not be understood as to this
The limitation of invention.
The object of the present invention is to provide a kind of raising 1D and the methods of following small-bend radius pipe bend straight end length, with solution
Problem certainly of the existing technology extends the welding surplus of elbow, improves the precision and intensity of welding, expands small bending
The application range of radius pipe.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Fig. 2-Fig. 9: present embodiments providing a kind of raising 1D and following small-bend radius pipe bend straight end length
Method, include the following steps,
S1: the shape of pipe is designed
It the use of cutting machine cutting diameter is D, wall thickness is the pipe 4 of t, and pipe 4 is preferably thin-wall aluminum alloy pipe, and in pipe
4 both ends of base symmetrically cut off 45-60 ° of limb, and limb is more preferably 55 °, make one end triangular shape of 4 port of pipe, pipe
The trapezoidal shape of the other end of 4 port of base, 4 outer wall lower end of pipe it is vertical with the lower cut-out of 4 port of pipe of trapezoidal shape away from
From for H, 4 cross-sectional view of pipe after being cut into is as shown in Fig. 2, the pipe a length of L >=6D of 4 outer arc finally obtained, 4 both ends of pipe of polishing
Burr is eliminated, to prevent from scratching mold cavity in forming process, cleans the grease stain of 4 inside and outside wall of pipe.
S2: it carries out pushing away o ing for the first time
Pipe 4 is mounted on tubing to push away in o ing equipment, cavity plate 5 is fixed on the table, and formed punch 1 and featured cylinder connect
It connects, mandrel 6 is connect with the anti-cylinder that pushes away, and the surface of the type chamber of cavity plate 5 symmetrical above and below and pipe 4 is lubricated processing, will be equipped with
The pipe 4 of elastic fill block 3 is symmetrically placed in the type chamber of cavity plate 5 about molding interface, and elastic fill block 3 is preferably polyurethane cylinder
Block, clearance fit between 4 port of pipe of trapezoidal shape and formed punch 1, starting tubing push away o ing equipment, and formed punch 1 pushes pipe 4
The initial position of forming is advanced to, then mandrel 6 advances to the type chamber bending section of cavity plate 5, and the bending angle of mandrel 6 is preferably
The position of 45 ° -60 °, more preferably 55 °, pipe 4 and mandrel 6 is as shown in figure 3, before push-in stroke of the molding back punching head 1 by setting
Stopping is proceeded to, after pressure maintaining 5 seconds, formed punch 1 and mandrel 6 are respectively retreated into about 20mm, the bend pipe for pushing away o ing for the first time is taken out in die sinking；
S3: the bend pipe for pushing away o ing for the first time is optimized
The limb that the bend pipe that first time as shown in Figure 5 pushes away o ing is cut to the pipe end contacted with formed punch 1, reverts to and is in
The elbow port of trapezoidal shape, then bend pipe is bowed out into straight line tip cut, as shown in Figure 6；The elbow port of trapezoidal shape can be kept away
Exempt from directly to contact with formed punch 1 on the inside of bend pipe, is conducive to prevent in tube wall in the flowing for pushing away curved bend pipe inside material in the process again
It is thinned and ruptures by tensile stress on the outside of the accumulation corrugation of side material and tube wall, excision bend pipe bows out straight line tip can be with
It avoids deforming elbow with the directly effect of mandrel 6 on the outside of elbow.
S4: the bend pipe for pushing away o ing for the first time being put into heating furnace and is made annealing treatment, and by taking aluminium alloy as an example, temperature is excellent
It is selected as 360-400 DEG C, more preferably 380 DEG C, soaking time is preferably 80-100min, more preferably 90min；At annealing
It manages to reduce the hardness of pipe fitting and eliminate residual stress, improves the plasticity of material, increase material ductility and toughness, reduce
The resistance of deformation of material avoids hair of the tubing in carrying out secondary forming and multiple forming process the defects of inner side of elbow rupture
It is raw.
S5: o ing is pushed away for the second time
The bend pipe pipe end for pushing away o ing for the first time is required to be cut and made annealing treatment according to the size of Fig. 6, is moved back
The bend pipe that the first time being disposed pushes away o ing is filled up bullet referring to the annealing condition in step S4 by the condition of fire processing
Property fill block 3 and put back to for the first time push away the position of o ing, as shown in fig. 7, matching formed punch 1 and the elbow port gap of trapezoidal shape
It closes, mandrel 6 directly contacts with the elastic fill block 3 of elbow, makes to be bonded to each other between elastic fill block 3, and molding back punching head 1 advances to
Formed punch 1 and mandrel 6 are respectively retreated about 20mm after pressure maintaining 5 seconds by the stroke of setting, and the bend pipe for pushing away o ing for the second time is taken out in die sinking,
As shown in Figure 9.
If pushing away straight end length before the elbow of the bend pipe of o ing for the second time is unable to meet demand, repetition pushes away o ing for the second time
Operation, progress repeatedly push away o ing, until meet demand.
Raising 1D in the present embodiment and tubing applied by the method for following small-bend radius pipe bend straight end length push away
O ing equipment includes formed punch 1, preceding guide sleeve 2, elastic fill block 3, pipe 4, cavity plate 5, mandrel 6, rear guide sleeve 7, structure and is pushed away curved
Forming Theory is as shown in Figure 3 and Figure 4.Elastic fill block 3 is supplied to 4 inner wall branch of pipe under the opposing force of formed punch 1 and mandrel 6
Support force.Formed punch 1 provides thrust and pipe 4 is promoted to bend 5 type of cavity plate is intracavitary, and pushes mandrel 6 backward by elastic fill block 3
Movement.
The method for improving 1D and following small-bend radius pipe bend straight end length in the present embodiment during the experiment, by
In the bend pipe for pushing away o ing for the first time pipe end premature excision limb and be heat-treated, processing can to avoid second in this way
Directly contacted with formed punch 1 on the inside of secondary bend pipe when pushing away o ing, be conducive to push away it is curved during bend pipe inside material flowing, improve
The plasticity of material increases material ductility and toughness, reduces the resistance of deformation material of material, improves and subsequent pushes away o ing energy
Power realizes rectilinear end before the elbow of 1D and following small-bend radius bent pipe by the secondary method for pushing away o ing or shaping again
Crack-free on the inside of the increase of a and elbow port；To the curved preceding optimization design for carrying out pipe shape is pushed away every time, bend pipe inner arc is improved
Accumulation of face region material during pushing away curved improves material flowability energy, solves and once pushes away o ing 1D and following small
The short problem of straight end length before bending radius pipe bend, is conducive to expand and pushes away o ing 1D and following small-bend radius pipe bend
Application range；Excision bend pipe, which bows out straight line tip, so that elbow is deformed with the directly effect of mandrel 6 to avoid on the outside of elbow；Repeatedly push away
O ing carries out on same mold, is saved greatly mold manufacture and production cost.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
1. a kind of method for improving 1D and following small-bend radius pipe bend straight end length, it is characterised in that: include the following steps,
S1: the shape of pipe is designed
Pipe is cut, and symmetrically cuts off limb at pipe both ends, makes one end triangular shape of pipe port, pipe port
The trapezoidal shape of the other end, polishing pipe both ends eliminate burr, clean the grease stain of pipe inside and outside wall；
S2: it carries out pushing away o ing for the first time
Pipe is mounted on tubing to push away in o ing equipment, cavity plate is fixed on the table, and formed punch is connect with featured cylinder, mandrel
It is connect with the anti-cylinder that pushes away, the surface of the type chamber of cavity plate symmetrical above and below and pipe is lubricated processing, it will be equipped with elastic fill block
Pipe is symmetrically placed in the type chamber of cavity plate about molding interface, and starting tubing pushes away o ing equipment, and formed punch pushes pipe advance
To the initial position of forming, then mandrel advances to the type chamber bending section of cavity plate, before molding back punching head is by the push-in stroke being arranged
Stopping is proceeded to, for a period of time, formed punch and mandrel retreat a distance, and the bend pipe for pushing away o ing for the first time is taken out in die sinking for pressure maintaining；
S3: the bend pipe for pushing away o ing for the first time is optimized
The bend pipe for pushing away o ing for the first time is cut into the limb with the pipe end of punch. contact, reverts to the bend pipe end of trapezoidal shape
Mouthful, then bend pipe is bowed out into straight line tip cut；
S4: the bend pipe for pushing away o ing for the first time is put into heating furnace and is made annealing treatment；
S5: o ing is pushed away for the second time
Pipe end by the S4 bend pipe that treated pushes away o ing for the first time is cut and made annealing treatment again, place
The bend pipe that the first time that reason finishes pushes away o ing fills up elastic fill block and puts back to the position for pushing away o ing for the first time, mandrel and elbow
The elastic fill block at place directly contacts, and molding back punching head advances to the stroke of setting, and for a period of time, formed punch and mandrel retreat for pressure maintaining
The bend pipe for pushing away o ing for the second time is taken out in a distance, die sinking.
2. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: if pushing away straight end length before the elbow of the bend pipe of o ing for the second time is unable to meet demand, repetition pushes away the behaviour of o ing for the second time
Make, progress repeatedly pushes away o ing, until meet demand.
3. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the diameter of pipe is D, wall thickness t, the outer arc length L >=6D of pipe in step S1.
4. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the limb that pipe is cut off in step S1 is 45 ° -60 °.
5. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: clearance fit between the pipe port and formed punch of trapezoidal shape in step S2.
6. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the bending angle of mandrel is 45 ° -60 ° in step S2.
7. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the dwell time in step S2 and S5 is 4-6 seconds.
8. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the distance that formed punch and mandrel retreat in step S2 and S5 is 15-25mm.
9. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the temperature of the annealing in step S4 and S5 is 360-400 DEG C, soaking time 80-100min.
10. the method according to claim 1 for improving 1D and following small-bend radius pipe bend straight end length, feature exist
In: the pipe is thin-wall aluminum alloy pipe.
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| CN201910206169.5A CN109807567B (en) | 2019-03-19 | 2019-03-19 | A method of improving 1D and following small-bend radius pipe bend straight end length |
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| CN109807567B true CN109807567B (en) | 2019-11-08 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110576088B (en) * | 2019-08-29 | 2021-01-26 | 四川航天长征装备制造有限公司 | 90-degree bending forming method and device for large-diameter thin pipe |
| CN112025219B (en) * | 2020-08-27 | 2023-01-03 | 江苏新阳光管业科技有限公司 | Method for processing stainless steel elbow lined with stainless steel for wire connection by utilizing ductility of stainless steel |
| CN114309127B (en) * | 2020-09-29 | 2023-09-26 | 郑州万达重工股份有限公司 | Inner wall surfacing small bending radius bent pipe and forming method thereof |
| CN114346026B (en) * | 2022-01-06 | 2023-05-09 | 南昌航空大学 | Pushing bending device |
| CN114378161A (en) * | 2022-01-19 | 2022-04-22 | 西安奥若特材料技术有限公司 | Metal pipe bending forming method |
| CN116798696B (en) * | 2023-03-31 | 2024-03-19 | 合肥科烨电物理设备制造有限公司 | Method for solving wrinkles generated on small-radius bending inner side of thin-wall mineral insulated conductor |
| CN116498427B (en) * | 2023-06-26 | 2023-09-08 | 南昌航空大学 | Processing method of high-temperature and high-pressure resistant elbow structure |
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| CN103658225A (en) * | 2014-01-03 | 2014-03-26 | 西安优耐特容器制造有限公司 | Cold forming process for non-ferrous metal seam elbow |
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| JPH01210325A (en) * | 1988-02-18 | 1989-08-23 | Meihou Kogyo Kk | Manufacture of curved tube with lining |
| CN1072627A (en) * | 1991-11-28 | 1993-06-02 | 陈振业 | The manufacture method of the steel elbow of band straight length and mould and products thereof |
| DE19702445A1 (en) * | 1997-01-24 | 1998-07-30 | Kolbenschmidt Ag | Process and tool for manufacturing flat bearing shells |
| CN100471616C (en) * | 2007-06-20 | 2009-03-25 | 洪信章 | Method for processing thin wall metal elbow |
| CN101850378B (en) * | 2010-05-21 | 2011-09-28 | 中国石油集团渤海石油装备制造有限公司 | Manufacturing method of 1.5D elbow |
| CN105689477A (en) * | 2016-02-16 | 2016-06-22 | 湖州久立管件有限公司 | Bending process for aluminum alloy elbow |
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| US4218996A (en) * | 1978-09-20 | 1980-08-26 | Usui Kokusai Sangyo Kabushiki Kaisha | Valve moving push rod for internal combustion engines and method of making the same |
| CN103658225A (en) * | 2014-01-03 | 2014-03-26 | 西安优耐特容器制造有限公司 | Cold forming process for non-ferrous metal seam elbow |
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