CN101314256A - Method for producing duct - Google Patents
Method for producing duct Download PDFInfo
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- CN101314256A CN101314256A CNA200810108751XA CN200810108751A CN101314256A CN 101314256 A CN101314256 A CN 101314256A CN A200810108751X A CNA200810108751X A CN A200810108751XA CN 200810108751 A CN200810108751 A CN 200810108751A CN 101314256 A CN101314256 A CN 101314256A
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- preformed blank
- middle body
- described preformed
- blank
- end portions
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Abstract
According to a method for producing a duct, a cylindrical preform, which opens at its both end portions in a longitudinal direction and has a central part, is formed. The central part is narrowed with respect to the both end portions. The central part has a smaller cross-sectional area than that of the both end portion. The preform is formed from a thermoplastic material, which increases in strength when stretched. Next, the preform is heated. Then, stretch blow molding is performed on the preform by stretching the preform in axial and radial directions thereof, such that the cross-sectional area of the central part becomes generally the same as that of the both end portion, or equal to or larger than that of the both end portion. The central part is narrowed to such an extent that it retains predetermined strength after performing the molding on the preform.
Description
Technical field
The present invention relates to make for example method of the pipeline that flows therein of air stream of fluid.
Background technology
In recent years, more and more higher to the requirement of automobile noise reduction, and also the suction noise that the engine suction pulse is produced also is to need one of noise that reduces.As reducing above-mentioned suction noise technology, the noise reduction pipeline (referring to Japanese patent application JP2007-119651) that the applicant's proposition links to each other with the air intake pipe of engine.Above-mentioned noise reduction pipeline has the main part and the fastening part that links to each other with flexible pipe (two end portions) that reduces noise.Main part is made by film, and fastening part is made by heavy wall.Traditional pipeline is made by direct blowing usually.Directly blowing is a kind of method, places between a pair of mould by the tubular blank made from thermoplastic, and compressed air is blown into wherein so that described blank is expanded.
Yet,, be difficult to make above-mentioned noise reduction pipeline with direct blowing because the thickness of its main part is thinned to 0.5mm or still less thin.More specifically, if directly blowing, although can control the wall thickness that changes institute's molded articles with known blank, but in fact be difficult to form 0.5mm or thinner film, this be since when the wall thickness of adjusting blank so that the wall thickness of institute's molded articles is 0.5mm or when thinner, the shape of blank is difficult to maintenance.In addition, in direct blowing, owing to form closed end portion in the blank that die clamp is held, this closed end portion is that pipeline is unwanted, need cut away described blind end in follow-up process.Like this, will produce waste material, and owing to the cost of equipment needed thereby in the following process process has increased product cost.Therefore, as the disclosed manufacturing tubular of unexamined Japan patent applicant announce No.05-154896 object, pipe for example, method be known, it is by the tubular of center direction stretching vertically blank (part), thereby and provides air that the circumferential wall part of its hollow is expanded to blank inside.
But according to the disclosed prior art of above-mentioned announcement No.05-154896, the diameter of blank middle body has only reduced the pattern draft of mould with respect to the diameter of blank openings at two ends, and it is tubular that described blank was before stretch-blow.When use obtained the material of its intensity by stretching, for example PET (PETG) or PEN (poly-naphthalene ethene) although use the blow moiding method above-mentioned material also almost can not stretch in the radial direction, thereby can not obtain its intensity.Therefore, when using blow moiding method to make tubular article style such as pipeline, the cross section of the openings at two ends of the described object usually cross section of middle body (main part) with it is identical, perhaps the cross section of the main part of described object is bigger than the cross section of the opening at its both ends, although use for example PET or PEN material, can not increase its intensity by prior art, this is open in above-mentioned announcement No.05-15489.
Summary of the invention
The present invention addresses the aforementioned drawbacks.Therefore, target of the present invention provides a kind of method of making pipeline, and the wall thickness of described pipeline is little, and the intensity height.Usually have identical cross section at each opening of the two end portions of described pipeline and the main part of described pipeline, or the cross section of described main part is bigger than the cross section of each opening at place, two ends.
In order to realize above-mentioned target of the present invention, provide the method for making pipeline.According to described method, form tubular preformed blank, at its two end portions opening, and described preformed blank has middle body along the longitudinal direction of described preformed blank.Described middle body narrows down with respect to described two end portions.The cross-sectional area of described middle body is littler than each cross-sectional area of described two end portions.Described preformed blank is made by thermoplastic, and intensity increases when it is stretched.Form the described preformed blank of back heating at described preformed blank.Thereby it is by finishing the stretch-blow of described preformed blank at the axial direction of described preformed blank and the described preformed blank that stretches in the radial direction, one of following after the heating of described preformed blank: roughly identical with each cross-sectional area in the described two end portions so that the cross-sectional area of described middle body becomes; Be equal to or greater than each the cross-sectional area in the described two end portions.The middle body of described preformed blank narrow down to a certain extent in case described preformed blank finish stretch-blow after described middle body still keep predetermined strength.
Description of drawings
By follow-up description, additional claim and follow-up accompanying drawing will understand best the present invention with and other target, characteristics and advantage, wherein:
Figure 1A illustrates the longitudinal sectional view according to the internal pipeline that is used for muffler of first embodiment of the invention;
Figure 1B is the cutaway view along Figure 1A center line IB-IB;
Fig. 2 A illustrates the longitudinal sectional view according to the muffler of first embodiment;
Fig. 2 B is the cutaway view along Fig. 2 A center line IIB-IIB;
Fig. 3 A illustrates the longitudinal sectional view according to the preformed blank of first embodiment;
Fig. 3 B illustrates along the cutaway view of the middle body of the described preformed blank of Fig. 3 A center line IIIB-IIIB;
Fig. 3 C illustrates along the cutaway view of the major diameter part of the described preformed blank of Fig. 3 A center line IIIC-IIIC;
Fig. 4 illustrates the figure according to the heating process of first embodiment;
Fig. 5 A illustrates the stretch figure of the drawing process before the preformed blank according to first embodiment;
Fig. 5 B illustrates the stretch figure of the drawing process after the preformed blank according to first embodiment;
Fig. 6 A illustrates according to first embodiment, and gases at high pressure are blown into the preformed blank inside figure of blowing process before;
Fig. 6 B illustrates according to first embodiment, and gases at high pressure are blown into the preformed blank inside figure of blowing process afterwards;
Fig. 7 A illustrates the longitudinal sectional view according to the internal pipeline that is used for muffler of second embodiment;
Fig. 7 B illustrates along the cutaway view of the main part of the described internal pipeline of Fig. 7 A center line VIIB-VIIB;
Fig. 7 C illustrates along the cutaway view of the pipe end of the described internal pipeline of Fig. 7 A center line VIIC-VIIC.
The specific embodiment
Describe embodiments of the invention below with reference to the accompanying drawings in detail.
(embodiment one)
Muffler 1 among first embodiment of the present invention has reduced for example suction noise of internal combustion engine, and shown in Fig. 2 A, it comprises the internal pipeline 2 of a part of suction channel that limits engine and is arranged in internal pipeline 2 external pipe 3 on every side by air layer.Above-mentioned internal pipeline 2 comprises main part 2A and pipe end divides 2B, shown in Figure 1B, main part 2A is circular perpendicular to the cross section of air-flow direction, and shown in Figure 1A, two ends that pipe end divides 2B to go up along the longitudinal direction at main part 2A have opening.The cross-sectional area of main part 2A is made peace greatly, and to divide the cross-sectional area of 2B be identical to pipe end.
With reference to figure 3A to 6B manufacture method according to internal pipeline 2 of the present invention is described.
(a) forming process of preformed blank
For example, in widely understood process of injection molding, the thermoplastic of fusing is injected into and forms preformed blank 20 in the metal die.As shown in Figure 3A, preformed blank 20 comprises major diameter part 20a, middle body 20b and tapering part 20c, major diameter part 20a forms pipe end in molded back and divides 2B, the cross-sectional area of middle body 20b is less than the cross-sectional area of major diameter part 20a, and tapering part 20c connects major diameter part 20a and middle body 20b.Shown in Fig. 3 B, 3C, middle body 20b and major diameter part 20a have circular section shape, and the area of section of middle body 20b is less than the area of section of major diameter part 20a.In other words, preformed blank 20 forms the cydariform of a tubular, and its middle body 20b is narrower than major diameter part 20a via tapering part 20c.The material that intensity increases by stretching is used as the thermoplastic use as PET (PETG) or PEN (poly-naphthalene ethene).
(b) heating process
As shown in Figure 4, molded preformed blank 20 is heated to suitable temperature.
(c) drawing process
Shown in Fig. 5 A, 5B, preformed blank 20 is stretched along its vertical (vertical direction of Fig. 5), and two major diameter part 20a of described preformed blank 20 are kept by patrix 4 and counterdie 5 simultaneously.For example, simultaneously, upside in Fig. 5 B (direction of arrow) is pulled on mould 4, the major diameter part 20a of the bottom of the blank of preformed simultaneously 20 is fixed in the counterdie 5, so that the top major diameter part 20a of stretching preformed blank 20, thereby middle body 20b and tapering part 20c extend the formation thin-walled along the longitudinal direction.In the process of the major diameter part 20a that keeps preformed blank 20, patrix 4 and counterdie 5 seal the open surfaces of described major diameter part 20a separately airtightly.
(d) blowing process
As shown in Figure 6A, after being arranged on the periphery of tapering part 20c and middle body 20b between patrix 4 and the counterdie 5, for example, gases at high pressure are blown into preformed blank 20 inside by the hole 5a that is blown on the counterdie 5 at the connection mode 6 that is used for blowing.Accordingly, shown in Fig. 6 B, tapering part 20c and middle body 20b radially are stretched, and closely are attached on the inner circular side face of connection mode 6 up to tapering part 20c and middle body 20b.Therefore, form the main part 2A of internal pipeline 2.
(the favourable influence of first embodiment)
According to the pipeline manufacture method of first embodiment, (PET PEN) makes and has high-intensity internal pipeline 2 to use the thermoplastic increase its intensity by stretching.Roughly the cross-sectional area with major diameter part 20a is identical up to the cross-sectional area of middle body 20b by cydariform preformed blank 20 being done stretch-blow (portion's middle body 20b along preformed blank 20 axially narrow with respect to major diameter part 20a with radial direction) within it, and prolongation percentage radially becomes greatly.Therefore form and have high-intensity main part 2A.
In addition, the meaning of (thermoplastic) " intensity increases by stretching " is: suppose to make two pipelines, their material is identical with wall thickness, do not comprise that when using the pipeline that the stretch-blow processing method is made uses the pipeline of stretch-blow processing method manufacturing to compare with the present invention, pipeline of the present invention has higher intensity than the former pipeline.
Because the internal pipeline 2 among first embodiment is the method manufacturings by stretch-blow, the wall thickness of described main part 2A is made into 0.5mm or thinner.More specifically, by shown in Fig. 5 A, 5B, in drawing process at the longitudinal direction described preformed blank 20 that stretches, the wall thickness of middle body 20b (finally forming the part of main part 2A) is with attenuation, thereby the wall thickness of preformed blank 20 does not need littler at the wall thickness of blowing stage needs than preformed blank 20.Like this, make the internal pipeline 2 with described main part 2A, it has 0.5mm or thinner thickness, thereby is difficult to form by conventional direct blowing.The middle body 20b of preformed blank 20 can narrow down to a certain degree, makes middle body 20b form the back at preformed blank 20 stretch-blows and keeps predetermined strength.In other words, the middle body 20b of preformed blank 20 is compressed to and to a certain degree makes the material that intensity increases when being stretched be stretched under predetermined extensibility.
Because when described preformed blank 20 carries out blowing, the external peripheral surface of the major diameter part 20a of described preformed blank 20 is remained on respectively in patrix 4 and the counterdie 5, when gases at high pressure were blown into preformed blank 20 inside, major diameter part 20a did not radially outwards expand.In other words, because the not attenuation of wall thickness of major diameter part 20a by blowing, make greatlyyer than main part 2A simultaneously, main part 2A forms by stretching middle body 20b in radial direction and axial direction, divides the intensity of 2B to be guaranteed as the pipe end of fastening part.According to above-mentioned manufacture method, stretch-blow has on the cydariform preformed blank 20 of two open end and can realize, and can not form the closed end part in moulded product.Therefore, it is unnecessary being used to cut off closed end back processing processing procedure partly, so that can not produce discarded material.
(embodiment two)
The example of the internal pipeline 2 with circular cross section has been described in embodiment one.As selection, for example, can make internal pipeline 2 shown in Fig. 7 A～7C with manufacture method of the present invention with polygon (for example hexagon) shape of cross section.When described internal pipeline 2 was used for the muffler 1 of embodiment one, it each was formed polygonal planar section as the vibration surface that vibrates owing to the suction noise, and described vibration surface has 0.5mm or littler thickness, preferred 0.2mm.The manufacture process of above-mentioned internal pipeline 2 is similar to the manufacture process of embodiment one, and comprises preformed blank forming process, heating process, drawing process and blowing process successively.In drawing process by along it axially and the stretch middle body 20b of described preformed blank 20 of radial direction, can make high-intensity internal pipeline 2.The internal pipeline 2 that forms manufacturing is so that the cross-sectional area S1 of its main part 2a roughly divides the cross-sectional area S2 of 2B identical with its pipe end.
(modification)
According to the manufacture method of the internal pipeline among first and second embodiment 2, can make the internal pipeline 2 of its both ends open with tubular preformed blank 20 by stretch blow molding process.As selection, after carrying out stretch-blow on the preformed blank 20 of the end of at least one distolateral sealing sealing, can bring in manufacturing internal pipeline 2 by cutting away described sealing.Although after drawing process, carry out the blowing process among first and second embodiment, also preformed blank drawing process and blowing process can be carried out simultaneously.More specifically, as the main path portion 20a that keeps described preformed blank 20 and when on the longitudinal direction of described preformed blank 20, stretching, described preformed blank is being expanded in the radial direction.
In first and second embodiment, form internal pipeline 2 make molded after the cross-sectional area of narrow middle body 20b of described preformed blank 20 roughly each the cross-sectional area with the both ends (main path portion 20a) of described preformed blank 20 is identical.As selection, can molded internal pipeline 2, so that the cross-sectional area of described middle body 20b is bigger than the cross-sectional area of each main path portion 20a.The method of described pipeline constructed in accordance is not limited to makes the internal pipeline 2 be used for muffler 1, and the method also can make the pipeline that is used for various purposes, for example is used for the air duct and the discharge duct of air-conditioning.
Other advantage and modification are easy for a person skilled in the art.Therefore the present invention is not limited to the specific details that illustrates and describe, representational equipment and illustrative example in its more wide in range field.
Claims (6)
1, the method for a kind of manufacturing pipeline (2) comprising:
Form tubular preformed blank (20), vertically locate opening along described preformed blank (20) in the two end portions (20a) of described preformed blank (20), and described preformed blank has middle body (20b), and described middle body narrows down with respect to described two end portions (20a), wherein:
The cross-sectional area of described middle body (20b) is littler than each cross-sectional area of described two end portions (20a); With
Described preformed blank (20) is made by thermoplastic, and intensity increases when it is stretched;
Forming described preformed blank (20) back heating described preformed blank (20); With
After the described preformed blank of heating (20), by described preformed blank (20) axially and the footpath described preformed blank (20) that upwards stretches on described preformed blank (20), carry out stretch-blow one of following so that the cross-sectional area of described middle body (20b) becomes:
Roughly the same with each the cross-sectional area in the described two end portions (20a); With
Be equal to or greater than each the cross-sectional area in the described two end portions (20a), the middle body (20b) of wherein said preformed blank (20) narrows down, so that after carrying out stretch-blow on the described preformed blank (20), described middle body (20b) keeps predetermined strength.
2, according to the process of claim 1 wherein that carrying out stretch-blow on described preformed blank (20) comprises:
When keeping the two end portions (20a) of described preformed blank (20), described preformed blank (20) stretches on the longitudinal direction of described preformed blank (20); With
Behind the described preformed blank (20) that stretches, described preformed blank (20) is being expanded in the radial direction by the inside that gases at high pressure is blown into described preformed blank (20).
3, according to the method for claim 2, also comprise:
By the stretching and the described preformed blank (20) that expands described middle body (20b) is formed main part (2A); With
By carrying out stretch-blow described two end portions (20a) is formed two pipe end branches (2B) respectively, wherein:
The described preformed blank (20) that stretches in a longitudinal direction is included in the described middle body (20b) that stretches on the longitudinal direction of described middle body (20b);
The described middle body (20b) that makes in the radial direction that is included in described middle body (20b) at the described preformed blank (20) that expands in the radial direction expands; With
The wall thickness of each of described two the pipe end branches of the wall ratio of described main part (2A) (2B) is little.
4, according to the process of claim 1 wherein that carrying out stretch-blow on described preformed blank (20) comprises:
When keeping the two end portions (20a) of described preformed blank (20), described preformed blank (20) stretches on the longitudinal direction of described preformed blank (20); With
In the described preformed blank (20) that stretches, described preformed blank (20) is being expanded in the radial direction by the inside that gases at high pressure is blown into described preformed blank (20).
5, according to the method for claim 4, also comprise:
By the stretching and the described preformed blank (20) that expands described middle body (20b) is formed main part (2A); With
By carrying out stretch-blow described two end portions (20a) is formed two pipe end branches (2B) respectively, wherein:
The described preformed blank (20) that stretches in a longitudinal direction is included in the described middle body (20b) that stretches on the longitudinal direction of described middle body (20b);
The described middle body (20b) that makes in the radial direction that is included in described middle body (20b) at the described preformed blank (20) that expands in the radial direction expands; With
The wall thickness of each of described two the pipe end branches of the wall ratio of described main part (2A) (2B) is little.
6, according to the process of claim 1 wherein that the described thermoplastic that intensity increases when being stretched is one of PETG and poly-naphthalene ethene.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007146625 | 2007-06-01 | ||
| JP146625/2007 | 2007-06-01 | ||
| JP328585/2007 | 2007-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101314256A true CN101314256A (en) | 2008-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810108751XA Pending CN101314256A (en) | 2007-06-01 | 2008-05-29 | Method for producing duct |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4380764B2 (en) |
| CN (1) | CN101314256A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103827596A (en) * | 2011-09-22 | 2014-05-28 | 罗伯特·博世有限公司 | Heat-conducting device for an absorber and method for the production thereof |
| CN109073247A (en) * | 2016-04-15 | 2018-12-21 | 大金工业株式会社 | The manufacturing equipment of pipe piece |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018162760A (en) * | 2017-03-27 | 2018-10-18 | 本田技研工業株式会社 | Intake passage structure |
| CN113618997A (en) * | 2021-08-17 | 2021-11-09 | 青岛普瑞希森医疗科技有限公司 | Special pipe and production process thereof |
-
2007
- 2007-12-20 JP JP2007328585A patent/JP4380764B2/en active Active
-
2008
- 2008-05-29 CN CNA200810108751XA patent/CN101314256A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103827596A (en) * | 2011-09-22 | 2014-05-28 | 罗伯特·博世有限公司 | Heat-conducting device for an absorber and method for the production thereof |
| CN103827596B (en) * | 2011-09-22 | 2016-09-21 | 罗伯特·博世有限公司 | Heat-transfer device and manufacture method thereof for absorber |
| CN109073247A (en) * | 2016-04-15 | 2018-12-21 | 大金工业株式会社 | The manufacturing equipment of pipe piece |
| CN109073247B (en) * | 2016-04-15 | 2020-11-06 | 大金工业株式会社 | Manufacturing equipment for pipeline parts |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4380764B2 (en) | 2009-12-09 |
| JP2009006697A (en) | 2009-01-15 |
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Open date: 20081203 |