CN105855344B - The forming method of minor radius bend pipe - Google Patents
The forming method of minor radius bend pipe Download PDFInfo
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- CN105855344B CN105855344B CN201510030074.4A CN201510030074A CN105855344B CN 105855344 B CN105855344 B CN 105855344B CN 201510030074 A CN201510030074 A CN 201510030074A CN 105855344 B CN105855344 B CN 105855344B
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- bend pipe
- forming method
- pipe fitting
- minor radius
- radius bend
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Abstract
The present invention provides a kind of forming method of minor radius bend pipe, by the way of one-mold multiple-member comprising step: the quantity of one-mold multiple-member is confirmed by computer-aided engineering tool analysis；Raw material pipe fitting is provided, is put it into molding die, it is preforming to pipe fitting progress, so that it is become upper and lower elliptic cross-section flat, left and right is wide from circular cross-section, forms elliptical tube；Elliptical tube is bent with the mode that perfusion is bent, reaches the shape close to product；It is the shape needed by applying interior high pressure for the pipe fitting final molding bent.Forming method of the invention can stablize, reliably mold minor radius bend pipe less than 1D caliber；In addition it is possible to efficiently solve the defects of minor radius bend pipe is due to radius is too small and occurs on the inside of bend pipe corrugation, recess.
Description
Technical field
The present invention relates to perfusions to bend, CAE (computer-aided engineering) analytical technology, interior high-pressure molding technical field, tool
For body, the present invention relates to a kind of forming methods of minor radius bend pipe.
Background technique
Fig. 1 is the schematic perspective view of the mould part on the common bent pipe forming device of one kind in the prior art.
As shown in Figure 1, the mould part includes numerous components such as clamping 101, guided mode 102, wheel model 103, Anti-wrinkling board 104 and core ball 105,
Bend pipe (not shown) is pressed into the profiling type chamber of wheel model 103 by it by clamping 101, guided mode 102 etc., then passes through wheel model 103
Rotation make elbow curvature.It is the simple process of such mode, practical, but also have certain limitation, the mainly bending of product
When radius is less than 1D caliber, such as when bending radius only has 0.6D, being formed using this conventional bend pipe mode will be extremely difficult, very
To can not form at all.
Fig. 2 is the stereochemical structure signal of the mould part on the common bent pipe forming device of another kind in the prior art
Figure.As shown in Fig. 2, the mould part includes each components such as upper mold 201, lower die 202 and plug 203, by (having shown in pipe fitting
The low melting points such as perfusion paraffin, low-melting alloy or rosin, then pass through the extruding of upper mold 201 and lower die 202, make in out)
Pipe fitting bends to the shape of design.Although such mode can effectively solve difficulty and bend pipe needs in above-mentioned usual manner
The drawbacks of one section of clamping straight-arm, and if dryed product can be bent simultaneously, stock utilization is improved, but is being irrigated pressure
When curved, if bend pipe inner radius is too small, the defects of corrugation, recess still can inevitably occur.
Summary of the invention
A technical problem to be solved by this invention is to provide a kind of forming method of minor radius bend pipe, can stablize,
Reliably mold the minor radius bend pipe less than 1D caliber.
Another technical problem to be solved by this invention is to provide a kind of forming method of minor radius bend pipe, can be effective
The defects of minor radius bend pipe that ground solves to be less than 1D caliber is due to radius is too small and occurs on the inside of bend pipe corrugation, recess.
In order to solve the above technical problems, the present invention provides a kind of forming method of minor radius bend pipe, using one-mold multiple-member
Mode comprising step:
A. the quantity of the one-mold multiple-member is confirmed by computer-aided engineering tool analysis；
B., raw material pipe fitting is provided, is put it into molding die, it is preforming to pipe fitting progress, make it by circular cross-section
Become upper and lower elliptic cross-section flat, left and right is wide, forms elliptical tube；
C. the elliptical tube is bent with the mode that perfusion is bent, reaches the shape close to product；
It D. is the shape needed by the pipe fitting final molding bent by high pressure in applying.
Optionally, in above-mentioned steps B, it is preforming after the pipe fitting elliptic cross-section short axle compared with the bend pipe
Bending radius it is 0.8 times smaller.
Optionally, in above-mentioned steps A, the computer-aided engineering tool needs to analyze the wall thickness of the bend pipe.
Optionally, in above-mentioned steps C, the mode that the perfusion is bent includes: that low melting point is perfused in the elliptical tube
Substance, the both ends sealing of the elliptical tube, by the extruding of the upper die and lower die in the molding die, reaches the elliptical tube
To the shape close to product.
Optionally, the low melting point is paraffin, low-melting alloy and/or rosin.
Optionally, in above-mentioned steps D, the mode of high pressure includes: the water filling by the molding die in the application
The type that mouth injects water into the pipe fitting is intracavitary, and the both ends sealing of the pipe fitting makes water generate immense pressure by pressurized measure, will
The pipe fitting is expanded into the shape finally needed.
Optionally, in above-mentioned steps C, the both ends of the elliptical tube are sealed with plug.
Optionally, in above-mentioned steps D, the both ends of the pipe fitting are sealed with sealing ring.
Compared with prior art, the invention has the following advantages that
The present invention provides a set of reliable, stable technical solution for the molding of minor radius bend pipe, passes through kinds of processes
Mixing application, carries out pipe fitting before step is bent in perfusion preforming, pipe fitting is flattened as elliptic cross-section, so that preforming
It is gentle that pipe fitting afterwards becomes comparison in bending, and bend pipe is effectively avoided corrugation, recess etc. occur in inside since radius is too small
Defect.
Detailed description of the invention
The above and other features of the present invention, property and advantage will pass through retouching with reference to the accompanying drawings and examples
It states and becomes readily apparent from, in which:
Fig. 1 is the schematic perspective view of the mould part on the common bent pipe forming device of one kind in the prior art；
Fig. 2 is the stereochemical structure signal of the mould part on the common bent pipe forming device of another kind in the prior art
Figure；
Fig. 3 is the flow chart of the forming method of the minor radius bend pipe of one embodiment of the invention；
Fig. 4 is to carry out in the forming method of the minor radius bend pipe of one embodiment of the invention to being put into raw material pipe fitting therein
The overlooking structure figure of preforming molding die；
Fig. 5 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 4 to the section knot on molding die along line A-A
Composition；
The front view structure of elliptical tube after Fig. 6 is preforming in the forming method for the minor radius bend pipe of embodiment illustrated in fig. 4
Figure；
Fig. 7 be in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 6 on the elliptical tube after preforming along line B-B
Sectional structure chart；
Fig. 8 is mode curved to oval effective perfusion pressure in the forming method of the minor radius bend pipe of one embodiment of the invention
The overlooking structure figure of the molding die bent；
Fig. 9 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 8 to the section knot on molding die along line A-A
Composition；
The stereochemical structure signal for the pipe fitting that Figure 10 has been bent in the forming method for the minor radius bend pipe of embodiment illustrated in fig. 8
Figure；
Figure 11 is to apply interior height to the pipe fitting bent in the forming method of the minor radius bend pipe of one embodiment of the invention
Pressure carries out the overlooking structure figure of the molding die of bulging；
Figure 12 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 11 to the section on molding die along line B-B
Structure chart；
Figure 13 is the bend pipe of one-mold multiple-member molded in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 11
Three-dimensional structure schematic diagram.
Specific embodiment
The invention will be further described with attached drawing combined with specific embodiments below, elaborates in the following description more
Details to facilitate a thorough understanding of the present invention, still the present invention obviously can be come with a variety of other ways different from this description it is real
It applies, those skilled in the art can make similar popularization according to practical situations without violating the connotation of the present invention, drill
It unravels silk, therefore should not be limited the scope of the invention with the content of this specific embodiment.
Fig. 3 is the flow chart of the forming method of the minor radius bend pipe of one embodiment of the invention.As shown in figure 3, the molding
By the way of one-mold multiple-member, process specifically includes that method
Firstly, executing step S301, the quantity of one-mold multiple-member is confirmed by computer-aided engineering (CAE) tool analysis.
Such bend pipe is usually hot end part, has more strict requirements to wall thickness, although one-mold multiple-member can be saved into
Originally, improve efficiency, but also will appear the defects of material is thinning overproof.Therefore, preliminary computer aided manufacturing is carried out before press-bending
It helps project analysis necessary, at least may include the factors such as the wall thickness for analyzing bend pipe.
Then, execute step S302, raw material pipe fitting (straight round tube) is provided, is put it into molding die, to the pipe fitting into
Row is preforming, so that its section is become upper and lower ellipse flat, left and right is wide from circle, forms elliptical tube.
The reason of doing so in this step be, it is assumed that the diameter of raw material pipe fitting is D, and the bending radius of bend pipe for molding is
R, then if not preforming, R/D≤1.Pipe fitting directly bend when, curved interior will appear corrugation, recess the defects of.
Fig. 4 is to carry out in the forming method of the minor radius bend pipe of one embodiment of the invention to being put into raw material pipe fitting therein
The overlooking structure figure of preforming molding die；Fig. 5 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 4 to molding
Along the sectional structure chart of line A-A on mold.After Fig. 6 is preforming in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 4
Elliptical tube main structure figure；Fig. 7 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 6 to ellipse after preforming
Along the sectional structure chart of line B-B on round tube.It should be noted that these and subsequent other attached drawing only as an example, its
It is not to be drawn according to the condition of equal proportion, and should not be constituted in this, as the protection scope to actual requirement of the present invention
Limitation.Please to Fig. 7 and as shown in connection with fig. 3 such as Fig. 4, after preforming, the short axle b of the elliptic cross-section of the pipe fitting becomes smaller, and makes
R/b >=1 is obtained, pipe fitting can become than more gentle in bending, it is possible to prevente effectively from the defects of corrugation, be recessed occurs in its inside.
Preferably, the short axle b of the elliptic cross-section of the pipe fitting after preforming should be than 0.8 times of the radius of curvature R of bend pipe
It is smaller.A in Fig. 7 is the long axis label of elliptic cross-section.
Then, step S303 is executed, elliptical tube is bent with the mode that perfusion is bent, reaches the shape close to product
Shape.
Fig. 8 is mode curved to oval effective perfusion pressure in the forming method of the minor radius bend pipe of one embodiment of the invention
The overlooking structure figure of the molding die bent；Fig. 9 be embodiment illustrated in fig. 8 minor radius bend pipe forming method in at
Along the sectional structure chart of line A-A on pattern tool；Figure 10 has been bent in the forming method for the minor radius bend pipe of embodiment illustrated in fig. 8
Pipe fitting schematic perspective view.Please to Figure 10 and as shown in connection with fig. 3 such as Fig. 8, in this step, the mode which bends
It may include: that the low melting points such as paraffin, low-melting alloy and/or rosin are perfused in elliptical tube, the both ends of elliptical tube are used stifled
First 303 sealing, by the extruding of upper mold 301 and lower die 302 in molding die, makes elliptical tube bend to the shape close to product
Shape (as shown in Figure 10).
It is the shape needed by applying interior high pressure for the pipe fitting final molding bent finally, executing step S304.
Figure 11 is to apply interior height to the pipe fitting bent in the forming method of the minor radius bend pipe of one embodiment of the invention
Pressure carries out the overlooking structure figure of the molding die of bulging；Figure 12 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 11
To the sectional structure chart on molding die along line B-B；Figure 13 is in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 11
The three-dimensional structure schematic diagram of the bend pipe of molded one-mold multiple-member.Please to Figure 13 and as shown in connection with fig. 3 such as Figure 11, in this step,
The mode of high pressure may include: that the type that injects water into pipe fitting by the water filling port 305 of molding die is intracavitary in the application, pipe fitting
Both ends are sealed with sealing ring 304, then make water generation immense pressure by pressurized measure, by pipe fitting in upper mold 301 and lower die 302
The shape finally needed is expanded under clamping.By the way that the both ends straight tube of the bend pipe of one-mold multiple-member as shown in fig. 13 that is cut off, then will
More than one piece bend pipe one by one open by cutting, so that it may obtain the minor radius bend pipe of single-piece one by one.
In conclusion the present invention provides a set of reliable, stable technical solution for the molding of minor radius bend pipe, pass through
Kinds of processes mixing application, carries out pipe fitting before step is bent in perfusion preforming, and pipe fitting is flattened as elliptic cross-section, is made
It is preforming after pipe fitting to become comparison in bending gentle, effectively avoid bend pipe from rising since radius is too small in inside
The defects of wrinkle, recess.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this field skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any modification to the above embodiments, equivalent variations
And modification, it each falls within the protection scope that the claims in the present invention are defined.
Claims (6)
1. a kind of forming method of minor radius bend pipe, by the way of one-mold multiple-member comprising step:
A. the quantity of the one-mold multiple-member is confirmed by computer-aided engineering tool analysis；
B., raw material pipe fitting is provided, is put it into preforming molding die, it is preforming to pipe fitting progress, make it by circle
Section becomes upper and lower elliptic cross-section flat, left and right is wide, forms elliptical tube；
C. the elliptical tube is bent with the mode that perfusion is bent, reaches the shape close to product；
It D. is the shape needed by the pipe fitting final molding bent by high pressure in applying, the side of high pressure in the application
Formula includes: that the type that injects water into the pipe fitting by the water filling port of the molding die of interior high pressure is intracavitary, and the both ends of the pipe fitting are close
Envelope makes water generate immense pressure, the pipe fitting is expanded into the shape finally needed by pressurized measure.
2. the forming method of minor radius bend pipe according to claim 1, which is characterized in that preforming in above-mentioned steps B
The short axle of the elliptic cross-section of the pipe fitting afterwards is 0.8 times smaller compared with the bending radius of the bend pipe.
3. the forming method of minor radius bend pipe according to claim 2, which is characterized in that in above-mentioned steps A, the meter
Calculation machine ancillary works tool needs to analyze the wall thickness of the bend pipe.
4. the forming method of minor radius bend pipe according to claim 3, which is characterized in that in above-mentioned steps C, the filling
The curved mode of injection pressure includes: that low melting point is perfused in the elliptical tube, and the both ends sealing of the elliptical tube passes through perfusion pressure
The extruding of upper die and lower die in curved molding die makes the elliptical tube reach the shape close to product.
5. the forming method of minor radius bend pipe according to claim 4, which is characterized in that the low melting point is stone
Wax, low-melting alloy and/or rosin.
6. the forming method of minor radius bend pipe according to claim 1, it is characterised in that:
In above-mentioned steps C, the both ends of the elliptical tube are sealed with plug；And/or
In above-mentioned steps D, the both ends of the pipe fitting are sealed with sealing ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510030074.4A CN105855344B (en) | 2015-01-21 | 2015-01-21 | The forming method of minor radius bend pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510030074.4A CN105855344B (en) | 2015-01-21 | 2015-01-21 | The forming method of minor radius bend pipe |
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| CN105855344A CN105855344A (en) | 2016-08-17 |
| CN105855344B true CN105855344B (en) | 2019-05-24 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513487B (en) * | 2016-08-30 | 2018-10-12 | 保隆(安徽)汽车配件有限公司 | A kind of low pressure preformation method based on interior high-pressure molding |
| CN106270043A (en) * | 2016-08-31 | 2017-01-04 | 上海奥林汽车安全***有限公司 | A kind of bend system for hydraulic pipe bender |
| CN106391794A (en) * | 2016-11-25 | 2017-02-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Small-curvature-radius forming method for conduit |
| CN110695157B (en) * | 2019-10-22 | 2021-02-09 | 浙江申吉钛业股份有限公司 | Method for precisely processing sharp bend of titanium alloy thin-walled tube |
| CN111468634B (en) * | 2020-04-16 | 2022-02-25 | 北京航天科颐技术有限公司 | Integral thermal forming method for aircraft engine flow guide pipe |
| CN112974588B (en) * | 2021-02-03 | 2022-11-25 | 日照职业技术学院 | Low-pressure stretch bending method for hollow part with extremely small bending radius |
| CN114346047A (en) * | 2022-01-19 | 2022-04-15 | 江苏博巴电器有限公司 | Elbow pipe integrated forming production process and production device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS171419B1 (en) * | 1973-07-23 | 1976-10-29 | ||
| JP3449491B2 (en) * | 1992-10-06 | 2003-09-22 | 臼井国際産業株式会社 | How to bend a metal tube with a small radius of curvature |
| CN100422366C (en) * | 2005-09-29 | 2008-10-01 | 西安航空发动机（集团）有限公司 | Low-melting point alloy for machining connecting conduct, its production and use |
| CN100496789C (en) * | 2006-07-07 | 2009-06-10 | 江阴机械制造有限公司 | Automatic speed following and pressure curve setting pushing system for pipe with small bending radius |
| CN102069102A (en) * | 2009-11-19 | 2011-05-25 | 财团法人金属工业研究发展中心 | Method for molding and manufacturing metal pipe |
| CN101972914B (en) * | 2010-05-17 | 2012-07-04 | 浙江天兴管业有限公司 | Manufacture method for bending crooked pipe |
| CN101817031B (en) * | 2010-05-20 | 2011-08-03 | 什邡市明日宇航工业股份有限公司 | Method for manufacturing titanium alloy guiding pipe for aircraft engine |
| CN101947582A (en) * | 2010-08-27 | 2011-01-19 | 哈尔滨工业大学 | Pipe bending method using pressurized soft core mould |
| CN102527788B (en) * | 2012-01-13 | 2015-04-15 | 佛山市康思达液压机械有限公司 | Variable-section pipe fitting bending method and hydraulic bending device |
| CN102601204A (en) * | 2012-03-15 | 2012-07-25 | 吉林省元隆达工装设备有限公司 | Multi-deformed bending forming method and device for pipe fitting |
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