CN105855344A - Forming method for small-radius bent pipes - Google Patents
Forming method for small-radius bent pipes Download PDFInfo
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- CN105855344A CN105855344A CN201510030074.4A CN201510030074A CN105855344A CN 105855344 A CN105855344 A CN 105855344A CN 201510030074 A CN201510030074 A CN 201510030074A CN 105855344 A CN105855344 A CN 105855344A
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- forming method
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Abstract
The invention provides a forming method for small-radius bent pipes. A one-mold multi-piece mode is adopted. The forming method comprises the steps that the one-mold multi-piece number is analyzed and determined through a computer aided engineering tool; raw material pipes are provided and placed in a forming mold, pre-forming is conducted on the pipes, the round cross section of each pipe is made to become an oval cross section with flat upper and lower portions and wide left and right portions, and oval pipes are formed; the oval pipes are bent in a perfusion bending mode to be in a shape similar to the shape of a product; and the bent pipes are formed to be in a required shape by applying internal high pressure. According to the forming method for the small-radius bent pipes, the small-radius bent pipes with the pipe diameter being smaller than 1 D can be formed stably and reliably, and in addition, the defects that the inner side of each bent pipe is crumpled, sunken and the like due to the fact that the radius of each small-radius bent pipe is too small can be effectively overcome.
Description
Technical field
The present invention relates to irrigate press-bending, CAE (computer-aided engineering) analytical technology, inner high voltage forming technique
Field, in particular it relates to the forming method of a kind of minor radius bend pipe.
Background technology
Fig. 1 is the stereochemical structure signal of the mould part on a kind of common bent pipe forming device of the prior art
Figure.As it is shown in figure 1, this mould part includes clamping 101, guided mode 102, wheel mould 103, Anti-wrinkling board 104 and
Numerous parts such as core ball 105, the press-in of bend pipe (not shown) is taken turns mould 103 by clamping 101, guided mode 102 etc. by it
Profiling die cavity in, then by wheel mould 103 rotation make elbow curvature.The technique of this kind of mode is simple, practical,
But when the bending radius also having certain limitation, mainly product is less than 1D caliber, such as bending radius is only
During 0.6D, use the bend pipe mode of this routine to be molded extremely difficult, cannot be molded the most at all.
Fig. 2 is that the stereochemical structure of the mould part on the bent pipe forming device that another kind of the prior art is common is shown
It is intended to.As in figure 2 it is shown, this mould part includes each parts such as upper mold 201, lower mold 202 and plug 203, its
By irrigating the low melting points such as paraffin, low-melting alloy or rosin in pipe fitting (having shown that), then by upper
Mould 201 and the extruding of lower mold 202, make pipe fitting bend to the shape of design.Although this kind of mode can effectively solve
Difficulty and bend pipe in above-mentioned usual manner need one section of drawback clamping straight-arm, and it is some to bend simultaneously
Product, improves stock utilization, but when being irrigated bending, if bend pipe inner radius is the least, still
The defects such as wrinkling, depression can inevitably occur.
Summary of the invention
A technical problem to be solved by this invention is to provide the forming method of a kind of minor radius bend pipe, it is possible to steady
Determine, reliably mold the minor radius bend pipe less than 1D caliber.
Another technical problem to be solved by this invention is to provide the forming method of a kind of minor radius bend pipe, it is possible to
Efficiently solve wrinkling, recessed less than what the minor radius bend pipe of 1D caliber occurred inside bend pipe owing to radius is the least
Fall into etc. defect.
For solving above-mentioned technical problem, the present invention provides the forming method of a kind of minor radius bend pipe, uses a mould many
The mode of part, it includes step:
A. the quantity of described one-mold multiple-member is confirmed by computer-aided engineering tool analysis；
B., raw material pipe fitting is provided, puts it in mould, described pipe fitting is carried out preforming so that it is by justifying
Tee section becomes elliptic cross-section the most flat, that left and right is wide, forms elliptical tube；
Described elliptical tube is bent by the mode C. bent with perfusion, reaches the shape close to product；
D. by apply inner high voltage by the described pipe fitting final molding bent be need shape.
Alternatively, in above-mentioned steps B, preforming after the short axle of elliptic cross-section of described pipe fitting compared with institute
0.8 times of the bending radius stating bend pipe less.
Alternatively, in above-mentioned steps A, described computer-aided engineering instrument needs to analyze the wall of described bend pipe
Thick.
Alternatively, in above-mentioned steps C, the mode that described perfusion is bent includes: irrigate in described elliptical tube
Low melting point, the two ends of described elliptical tube seal, by the extruding of the upper die and lower die in described mould,
Described elliptical tube is made to reach the shape close to product.
Alternatively, described low melting point is paraffin, low-melting alloy and/or rosin.
Alternatively, in above-mentioned steps D, the mode of described applying inner high voltage includes: by described mould
Water filling port inject water in the die cavity of described pipe fitting, the two ends of described pipe fitting seal, and make aquatic products by pressurized measure
Raw immense pressure, is expanded into the shape of final needs by described pipe fitting.
Alternatively, in above-mentioned steps C, the two ends plug of described elliptical tube seals.
Alternatively, in above-mentioned steps D, the two ends sealing ring of described pipe fitting seals.
Compared with prior art, the invention have the advantages that
The present invention is that the shaping of minor radius bend pipe provides a set of reliable, stable technical scheme, and it is by multiple
Technique mixing application, carried out preforming to pipe fitting before perfusion press-bending step, and being flattened by pipe fitting is elliptic cross-section,
Make preforming after pipe fitting become comparison when bending mild, be prevented effectively from bend pipe owing to radius is the least in inner side
The defects such as wrinkling, depression occur.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage will be by below in conjunction with the accompanying drawings and embodiment
Description and become readily apparent from, wherein:
Fig. 1 is the stereochemical structure signal of the mould part on a kind of common bent pipe forming device of the prior art
Figure；
Fig. 2 is that the stereochemical structure of the mould part on the bent pipe forming device that another kind of the prior art is common is shown
It is intended to；
Fig. 3 is the flow chart of the forming method of the minor radius bend pipe of one embodiment of the invention；
Fig. 4 be the minor radius bend pipe of one embodiment of the invention forming method in putting into raw material pipe fitting therein
Carry out the plan structure figure of preforming mould；
Fig. 5 be the minor radius bend pipe of embodiment illustrated in fig. 4 forming method in on mould along line A-A
Sectional structure chart；
Fig. 6 be the minor radius bend pipe of embodiment illustrated in fig. 4 forming method in preforming after the master of elliptical tube regard
Structure chart；
Fig. 7 be the minor radius bend pipe of embodiment illustrated in fig. 6 forming method in edge on the elliptical tube after preforming
The sectional structure chart of line B-B；
Fig. 8 be the minor radius bend pipe of one embodiment of the invention forming method in elliptical tube perfusion bend
Mode carries out the plan structure figure of the mould bent；
Fig. 9 be the minor radius bend pipe of embodiment illustrated in fig. 8 forming method in on mould along line A-A
Sectional structure chart；
Figure 10 is the stereochemical structure of the pipe fitting bent in the forming method of the minor radius bend pipe of embodiment illustrated in fig. 8
Schematic diagram；
Figure 11 be the minor radius bend pipe of one embodiment of the invention forming method in the pipe fitting that bent is applied in
High pressure carries out the plan structure figure of the mould of bulging；
Figure 12 be the minor radius bend pipe of embodiment illustrated in fig. 11 forming method in on mould along line B-B
Sectional structure chart；
Figure 13 be the minor radius bend pipe of embodiment illustrated in fig. 11 forming method in type one-mold multiple-member curved
The three-dimensional structure schematic diagram of pipe.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the invention will be further described, elaborates in the following description
More details so that fully understanding the present invention, but the present invention obviously can be different from that this describes with multiple its
Its mode is implemented, those skilled in the art can in the case of intension of the present invention according to reality application feelings
Condition is made similar popularization, is deduced, and should not limit 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 it is shown on figure 3,
This forming method uses the mode of one-mold multiple-member, and its flow process specifically includes that
First, perform step S301, confirm one-mold multiple-member by computer-aided engineering (CAE) tool analysis
Quantity.
This type of bend pipe is usually hot junction part, has more strict requirements to wall thickness, although one-mold multiple-member can save
About cost, improve efficiency, but also there will be the thinning defect such as overproof of material.Therefore, at the beginning of carrying out before bending
The computer-aided engineering analysis of step is necessary, at least can include the factor such as wall thickness analyzing bend pipe.
Then, perform step S302, it is provided that raw material pipe fitting (straight pipe), put it in mould, right
This pipe fitting carries out preforming so that it is cross section is become ellipse the most flat, that left and right is wide from circle, forms elliptical tube.
The reason done so in this step is, it is assumed that a diameter of D of raw material pipe fitting, the bending of bend pipe for molding
Radius is R, if the most preforming, then R/D≤1.Pipe fitting is when directly bending, and its curved interior there will be
The defects such as wrinkling, depression.
Fig. 4 be the minor radius bend pipe of one embodiment of the invention forming method in putting into raw material pipe fitting therein
Carry out the plan structure figure of preforming mould；Fig. 5 is the shaping of the minor radius bend pipe of embodiment illustrated in fig. 4
To sectional structure chart along line A-A on mould in method.Fig. 6 is that the minor radius of embodiment illustrated in fig. 4 is curved
In the forming method of pipe preforming after the main TV structure figure of elliptical tube；Fig. 7 is the minor radius of embodiment illustrated in fig. 6
To sectional structure chart along line B-B on the elliptical tube after preforming in the forming method of bend pipe.It should be noted that
These and other accompanying drawing follow-up are all only used as example, and it is not to draw according to the condition of equal proportion, and
Should not be construed as limiting in this, as to the protection domain of actual requirement of the present invention.Please such as Fig. 4 to Fig. 7 and combine figure
Shown in 3, after preforming, the short axle b of the elliptic cross-section of this pipe fitting diminishes so that R/b >=1, pipe fitting exists
Ratio can be become during bending shallower, can be prevented effectively from inside it and defects such as wrinkling, depression occur.
Preferably, the short axle b of the elliptic cross-section of this pipe fitting after preforming should be than the radius of curvature R of bend pipe
0.8 times less.A in Fig. 7 is the major axis label of elliptic cross-section.
Then, performing step S303, elliptical tube is bent by the mode bent with perfusion, reaches close to product
Shape.
Fig. 8 be the minor radius bend pipe of one embodiment of the invention forming method in elliptical tube perfusion bend
Mode carries out the plan structure figure of the mould bent；Fig. 9 is the one-tenth of the minor radius bend pipe of embodiment illustrated in fig. 8
To sectional structure chart along line A-A on mould in type method；Figure 10 is the minor radius of embodiment illustrated in fig. 8
The perspective view of the pipe fitting bent in the forming method of bend pipe.Please such as Fig. 8 to Figure 10 and combine Fig. 3
Shown in, in this step, the mode that this perfusion is bent may include that and irrigates paraffin, low melting point conjunction in elliptical tube
Gold and/or the low melting point such as rosin, the two ends plug 303 of elliptical tube seals, upper by mould
Mould 301 and the extruding of lower mold 302, make elliptical tube bend to the shape (as shown in Figure 10) close to product.
Finally, perform step S304, be the shape needed by applying inner high voltage by the pipe fitting final molding bent
Shape.
Figure 11 be the minor radius bend pipe of one embodiment of the invention forming method in the pipe fitting that bent is applied in
High pressure carries out the plan structure figure of the mould of bulging；Figure 12 is the minor radius bend pipe of embodiment illustrated in fig. 11
To sectional structure chart along line B-B on mould in forming method；Figure 13 is the little of embodiment illustrated in fig. 11
The three-dimensional structure schematic diagram of the bend pipe of in type one-mold multiple-member in the forming method of radius elbow.Please if Figure 11 is to figure
13 and combine shown in Fig. 3, in this step, the mode of this applying inner high voltage may include that passes through mould
Water filling port 305 inject water in the die cavity of pipe fitting, the two ends sealing ring 304 of pipe fitting seals, then passes through supercharging
Measure makes water produce immense pressure, and pipe fitting is expanded under the clamping of upper mold 301 and lower mold 302 shape of final needs
Shape.By the two ends straight tube of the bend pipe of one-mold multiple-member as shown in fig. 13 that is excised, then by more than one piece bend pipe one all
Separately, it is possible to obtain the minor radius bend pipe of single-piece one by one.
In sum, the present invention is that the shaping of minor radius bend pipe provides a set of reliable, stable technical scheme,
Pipe fitting, by kinds of processes mixing application, was carried out preforming before perfusion press-bending step by it, by pipe fitting flattening was
Elliptic cross-section so that it is mild that the pipe fitting after preforming becomes comparison when bending, is prevented effectively from bend pipe due to radius
The least and the defect such as wrinkling, depression occurs in inner side.
Although the present invention is open as above with preferred embodiment, but it is not for limiting the present invention, any ability
Field technique personnel without departing from the spirit and scope of the present invention, can make possible variation and amendment.Therefore,
Every content without departing from technical solution of the present invention, according to appointing that above example is made by the technical spirit of the present invention
What amendment, equivalent variations and modification, within each falling within the protection domain that the claims in the present invention are defined.
Claims (7)
1. a forming method for minor radius bend pipe, uses the mode of one-mold multiple-member, and it includes step:
A. the quantity of described one-mold multiple-member is confirmed by computer-aided engineering tool analysis；
B., raw material pipe fitting is provided, puts it in mould, described pipe fitting is carried out preforming so that it is by justifying
Tee section becomes elliptic cross-section the most flat, that left and right is wide, forms elliptical tube；
Described elliptical tube is bent by the mode C. bent with perfusion, reaches the shape close to product；
D. by apply inner high voltage by the described pipe fitting final molding bent be need shape.
The forming method of minor radius bend pipe the most according to claim 1, it is characterised in that in above-mentioned steps B
In, preforming after described pipe fitting elliptic cross-section short axle compared with 0.8 times of bending radius of described bend pipe more
Little.
The forming method of minor radius bend pipe the most according to claim 2, it is characterised in that in above-mentioned steps A
In, described computer-aided engineering instrument needs to analyze the wall thickness of described bend pipe.
The forming method of minor radius bend pipe the most according to claim 3, it is characterised in that in above-mentioned steps C
In, the mode that described perfusion is bent includes: irrigate low melting point, the two of described elliptical tube in described elliptical tube
End seals, and by the extruding of the upper die and lower die in described mould, makes described elliptical tube reach close to product
Shape.
The forming method of minor radius bend pipe the most according to claim 4, it is characterised in that described low melting point
Material is paraffin, low-melting alloy and/or rosin.
The forming method of minor radius bend pipe the most according to claim 5, it is characterised in that in above-mentioned steps D
In, the mode of described applying inner high voltage includes: inject water into described pipe fitting by the water filling port of described mould
In die cavity, the two ends of described pipe fitting seal, and make water produce immense pressure by pressurized measure, are expanded into by described pipe fitting
The final shape needed.
The forming method of minor radius bend pipe the most according to claim 6, it is characterised in that:
In above-mentioned steps C, the two ends plug of described elliptical tube seals；And/or
In above-mentioned steps D, the two ends sealing ring of described pipe fitting seals.
Priority Applications (1)
| 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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| 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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| Publication Number | Publication Date |
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| CN105855344A true CN105855344A (en) | 2016-08-17 |
| CN105855344B CN105855344B (en) | 2019-05-24 |
Family
ID=56623077
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| CN201510030074.4A Active CN105855344B (en) | 2015-01-21 | 2015-01-21 | The forming method of minor radius bend pipe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270043A (en) * | 2016-08-31 | 2017-01-04 | 上海奥林汽车安全系统有限公司 | 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 |
| CN106513487A (en) * | 2016-08-30 | 2017-03-22 | 保隆(安徽)汽车配件有限公司 | Low-pressure pre-forming method based on internal high-pressure forming |
| CN110695157A (en) * | 2019-10-22 | 2020-01-17 | 浙江申吉钛业股份有限公司 | Method for bending titanium alloy thin-walled tube sharply |
| CN111468634A (en) * | 2020-04-16 | 2020-07-31 | 北京航天科颐技术有限公司 | Integral thermal forming method for aircraft engine flow guide pipe |
| CN112974588A (en) * | 2021-02-03 | 2021-06-18 | 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513487A (en) * | 2016-08-30 | 2017-03-22 | 保隆(安徽)汽车配件有限公司 | Low-pressure pre-forming method based on internal high-pressure forming |
| 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 | 上海奥林汽车安全系统有限公司 | 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 |
| CN110695157A (en) * | 2019-10-22 | 2020-01-17 | 浙江申吉钛业股份有限公司 | Method for bending titanium alloy thin-walled tube sharply |
| CN111468634A (en) * | 2020-04-16 | 2020-07-31 | 北京航天科颐技术有限公司 | Integral thermal forming method for aircraft engine flow guide pipe |
| 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 |
| CN112974588A (en) * | 2021-02-03 | 2021-06-18 | 日照职业技术学院 | Low-pressure stretch bending method for hollow part with extremely small bending radius |
| 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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