CN102168774B - Staggered-welded self-reinforcing pipes and forming method thereof - Google Patents
Staggered-welded self-reinforcing pipes and forming method thereof Download PDFInfo
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- CN102168774B CN102168774B CN2011101008149A CN201110100814A CN102168774B CN 102168774 B CN102168774 B CN 102168774B CN 2011101008149 A CN2011101008149 A CN 2011101008149A CN 201110100814 A CN201110100814 A CN 201110100814A CN 102168774 B CN102168774 B CN 102168774B
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Abstract
The invention discloses staggered-welded self-reinforcing pipes and a forming method thereof, and belongs to the technical field of the advanced machining of high polymer materials. The pipes have a structure with inner and outer layers, and mainly comprise an inner wall pipe and an outer wall pipe, wherein the inner wall pipe and the outer wall pipe both have two welding marks; and the welding marks of the inner wall pipe and the welding marks of the outer wall pipe are staggered mutually. The forming method comprises the following steps of: dividing a melt extruded from an extruder into four strands of melts by a flow divider according to the requirement of wall thickness; conveying each strand of melt forwards, unfolding and enveloping to form a semicircle, and converging further to form the inner wall pipe and the outer wall pipe so as to form the staggered-welded self-reinforcing pipes, wherein melt lines of the inner wall pipe and the outer wall pipe are not in the same position. The staggered-welded self-reinforcing pipes have a simple structure, the damage to the quality of the pipes due to the invalidation of the welding marks can be reduced greatly, and the strength of the pipes can be improved simultaneously; and the forming method for the pipes is based on a simple principle, is high in actionability and low in manufacturing cost, and a plurality of extruders which are needed by multi-layer extrusion molding are not required.
Description
Technical field
The present invention relates to macromolecular material advanced machining technology field, particularly relate to a kind of dispersion welding self-reinforcing tubing and forming method thereof.
Background technology
In recent years, along with improving constantly of processing of high molecular material technology, plastic pipe has been obtained rapid progress and fast development in China, and the advantage that the new material that particularly constantly occurs and new technology make plastic pipe is more and more outstanding.Compare with pipe of cement with traditional metal tube, the advantage such as that plastic pipe has is lightweight, good corrosion resistance, shock resistance and tensile property are strong, and the plastic pipe inwall is more smooth, coefficient of friction is little, fluid resistance is little, good energy-conserving effect, convenient transportation, long service life is installed simply.
Extrusion molding is to produce the most frequently used forming method of plastic pipe, has the production process serialization, and production efficiency is high, and the range of work is wide, the advantages such as small investment, instant effect.But, for existing extruder head (particularly central feeding extruder head and side direction feed extruder head), because the existence of current divider and support thereof makes the shaping pipe surface weld bond occur, affect products appearance and quality.
Extrude weld mark and be plastic melt through current divider or its support the time, two strands or multiply material stream converge, owing to reasons such as temperature, pressure, and a kind of linear trace that forms at incomplete fusion at the interface.In order to slacken weld mark to the impact of product properties, commonly used have following two kinds of methods: 1. the flowability that increases material; 2. change planform and the size of mouthful mould.But these two kinds of methods can not be from changing the form of weld mark in essence, and weld mark still runs through and is present on the whole wall thickness, in case losing efficacy appears in the weld mark zone, will make whole structure ageing and destruction.
For improving the intensity of tubing, the multi-layer co-extruded tubing of existing extensively employing.Multi-layer co-extruded is to utilize many extruders (3 ~ 7), utilizes co-extrusion die head production multilayer (5 ~ 9 layers) goods, to satisfy the certain performance requirement of product.This production method can effectively reduce weld mark to the impact of pipe workpiece quality, but this production equipment is complicated, and investment is large, and equipment mainly relies on import at present.In addition, this method is not paid attention to weld mark to the impact of pipe workpiece quality mainly for the production of many Material claddings tubing.
Summary of the invention
For technology and the forming defect of existing tubing, the present invention proposes a kind of staggered-welded self-reinforcing pipes, and this tubing drops to weld mark minimum on the impact of its quality, and intensity is high, production efficiency is high, cost is low.
For achieving the above object, the present invention by the following technical solutions: a kind of staggered-welded self-reinforcing pipes, have inside and outside bilayer or sandwich construction, each layer pipe respectively has weld mark, stagger each other in the position of the weld mark of each layer pipe.
A kind of staggered-welded self-reinforcing pipes of the present invention, has interior outer double-layer structure, namely formed by inner wall tube and outer wall pipe, the ratio of the wall thickness of inner wall tube and outer wall pipe can be 1:1, also can be other any ratio, inner wall tube and outer wall pipe have weld mark separately, stagger each other in the position of inner wall tube weld mark and outer wall pipe weld mark.
A kind of staggered-welded self-reinforcing pipes of the present invention, the weld mark of inner wall tube can be parallel to the tubular axis line, also shape twist; Spiral weld mark can further weaken it to the impact of pipe workpiece quality.
A kind of staggered-welded self-reinforcing pipes of the present invention, the weld mark of outer wall pipe can be parallel to the tubular axis line, also shape twist, the hand of spiral can be identical with the inner wall tube weld mark hand of spiral, also can be opposite; In like manner, spiral weld mark can further weaken it to the impact of pipe workpiece quality, and when rotation direction was opposite, the destructive power that acts on inner wall tube or the outer wall pipe can not impact or even eliminate the possibility of destruction to outer wall pipe and inner wall tube owing to the interaction between inner wall tube and the outer wall pipe.
A kind of staggered-welded self-reinforcing pipes of the present invention, inner wall tube and outer wall pipe can be individual layer homogenous material components, also can be the many material components with stepped construction.
The forming method of a kind of staggered-welded self-reinforcing pipes of the present invention, its forming method is as follows:
(1) plastic grain is through the extruder fusion plastification, and high-temperature fusant is fed forward to current divider, according to inner wall tube and the requirement of outer wall thickness of pipe wall, current divider is divided into four part A, B, C and D with high-temperature fusant, wherein every two-part flow is identical, i.e. QA=QD, QB=QC;
(2) carry and transition by runner, every part melt is fed forward, launches, and further envelope becomes semicircle;
(3) on the suitable length position of runner, the semicircle that melt B becomes with melt C envelope merges into inner wall tube or the outer wall pipe of pipe, and the semicircle that melt A becomes with melt D envelope merges into outer wall pipe or the inner wall tube of pipe;
(4) inner wall tube and outer wall pipe combine together, and form staggered-welded self-reinforcing pipes.
The present invention has following advantage:
1, pipe structure of the present invention is simple, and is staggered by the weld mark that makes pipe material inner wall pipe and outer wall pipe, reduced widely weld mark and lost efficacy to the destruction of pipe workpiece quality.
2, tubing of the present invention has interior outer double-layer structure, can improve tubing intensity.
3, the forming method principle of tubing of the present invention is simple, and exploitativeness is strong, need as the multilayer extrusion moulding need not many extruders, low cost of manufacture.
Description of drawings
Fig. 1 is the section structure schematic diagram of staggered-welded self-reinforcing pipes of the present invention.
Fig. 2 is the forming method schematic diagram of staggered-welded self-reinforcing pipes of the present invention.
Among the figure: 1-tubing, 2-inner wall tube, 3-outer wall pipe, 4-outer wall pipe weld mark, 5-inner wall tube weld mark, 6-melt, 6-1-melt A, 6-2-melt B, 6-3-melt C, 6-4-melt D, 7-semicircle.
The specific embodiment
As shown in Figure 1, a kind of staggered-welded self-reinforcing pipes 1 has interior outer double-layer structure, mainly is comprised of inner wall tube 2 and outer wall pipe 3.The ratio of the wall thickness of inner wall tube 2 and outer wall pipe 3 can be 1:1, also can be other any ratio.Inner wall tube 2 and outer wall pipe 3 respectively have two weld marks, and inner wall tube weld mark 5 staggers each other with the position of outer wall pipe weld mark 4.
A kind of staggered-welded self-reinforcing pipes 1 of the present invention, inner wall tube weld mark 5 can be parallel to tubing 1 axis, also shape twist; Spiral weld mark can further weaken it to the impact of pipe workpiece quality.
A kind of staggered-welded self-reinforcing pipes 1 of the present invention, outer wall pipe weld mark 4 can be parallel to tubing 1 axis, also shape twist, the hand of spiral can be identical with inner wall tube weld mark 5 hands of spiral, also can be opposite; In like manner, spiral weld mark can further weaken it to the impact of pipe workpiece quality, and when rotation direction was opposite, the destructive power that acts on inner wall tube 2 or the outer wall pipe 3 can not impact or even eliminate the possibility of destruction to outer wall pipe 3 and inner wall tube 2 owing to the interaction between inner wall tube 2 and the outer wall pipe 3.
A kind of staggered-welded self-reinforcing pipes 1 of the present invention, inner wall tube 2 and outer wall pipe 3 can be individual layer homogenous material components, also can be the many material components with stepped construction.
The forming method of a kind of staggered-welded self-reinforcing pipes 1 of the present invention, its forming method is as follows:
(1) plastic grain is through the extruder fusion plastification, high-temperature fusant 6 is fed forward to current divider, according to inner wall tube 2 and the 3 wall thickness requirements of outer wall pipe, current divider is divided into four part melt A 6-1, melt B 6-2, melt C 6-3 and melt D 6-4 with high-temperature fusant, wherein every two-part flow is identical, be QA=QD, QB=QC, as shown in Figure 2;
(2) carry and transition by runner, every part melt is fed forward, launches, and further envelope becomes semicircle 7;
(3) on the suitable length position of runner, the semicircle that melt B 6-2 becomes with melt C 6-3 envelope merges into inner wall tube 2 or the outer wall pipe 3 of pipe, and the semicircle that melt A 6-1 becomes with melt D 6-4 envelope merges into outer wall pipe 3 or the inner wall tube 2 of pipe;
(4) inner wall tube 2 and outer wall pipe 3 combine together, and form staggered-welded self-reinforcing pipes 1.
Claims (2)
1. staggered-welded self-reinforcing pipes, it is characterized in that: have interior outer double-layer structure, inner wall tube and outer wall pipe are individual layer homogenous material components, stagger each other in the position of the weld mark of each layer pipe; The formation structure of the inner wall tube of tubing and outer wall pipe is: plastic grain forms high-temperature fusant through the extruder fusion plastification and is fed forward to current divider, current divider is divided into four part A with high-temperature fusant, B, C and D, wherein the flow of A part equals the flow of D part, the flow of B part equals the flow of C part, carry and transition by runner, every part melt is fed forward, launch, and further envelope becomes semicircle, on the suitable length position of runner, the semicircle that melt B becomes with melt C envelope merges into inner wall tube or the outer wall pipe of pipe, and the semicircle that melt A becomes with melt D envelope merges into outer wall pipe or the inner wall tube of pipe; The weld mark of inner wall tube and the weld mark of outer tube wall be shape twist, and the rotation direction of the two is opposite.
, the forming method of a kind of staggered-welded self-reinforcing pipes claimed in claim 1, it is characterized in that:
At first, homogenous material component plastic grain forms high-temperature fusant through the extruder fusion plastification and is fed forward to current divider, and according to inner wall tube and the requirement of outer wall thickness of pipe wall, current divider is divided into four part A, B, C and D with high-temperature fusant, wherein every two-part flow is identical, i.e. Q
A=Q
D, Q
B=Q
C
Then, carry and transition by runner, every part melt is fed forward, launches, and further envelope becomes semicircle;
Moreover on the suitable length position of runner, the semicircle that melt B becomes with melt C envelope merges into inner wall tube or the outer wall pipe of pipe, and the semicircle that melt A becomes with melt D envelope merges into outer wall pipe or the inner wall tube of pipe;
At last, inner wall tube and outer wall pipe combine together, and the weld mark of inner wall tube and the weld mark of outer tube wall be shape twist, and the rotation direction of the two is opposite, form staggered-welded self-reinforcing pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101008149A CN102168774B (en) | 2011-04-21 | 2011-04-21 | Staggered-welded self-reinforcing pipes and forming method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101008149A CN102168774B (en) | 2011-04-21 | 2011-04-21 | Staggered-welded self-reinforcing pipes and forming method thereof |
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| Publication Number | Publication Date |
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| CN102168774A CN102168774A (en) | 2011-08-31 |
| CN102168774B true CN102168774B (en) | 2013-04-10 |
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| CN2011101008149A Expired - Fee Related CN102168774B (en) | 2011-04-21 | 2011-04-21 | Staggered-welded self-reinforcing pipes and forming method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1375409A (en) * | 1971-01-04 | 1974-11-27 | ||
| EP0486735A1 (en) * | 1990-11-20 | 1992-05-27 | Hoover Universal,Inc. | Die head for plastic with barrier forming material |
| DE4135336A1 (en) * | 1991-10-26 | 1993-04-29 | Rehau Ag & Co | Extruding three-ply plastic tubing, etc. - by combining the layers together in the extruder in such a way that their longitudinal weld lines are offset from each other |
| CN1118583A (en) * | 1993-02-10 | 1996-03-13 | 西德劳柔性包装有限公司 | Multi-layered sheet formed with extrusion, apparatus for making same and pipes made of same |
-
2011
- 2011-04-21 CN CN2011101008149A patent/CN102168774B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1375409A (en) * | 1971-01-04 | 1974-11-27 | ||
| EP0486735A1 (en) * | 1990-11-20 | 1992-05-27 | Hoover Universal,Inc. | Die head for plastic with barrier forming material |
| DE4135336A1 (en) * | 1991-10-26 | 1993-04-29 | Rehau Ag & Co | Extruding three-ply plastic tubing, etc. - by combining the layers together in the extruder in such a way that their longitudinal weld lines are offset from each other |
| CN1118583A (en) * | 1993-02-10 | 1996-03-13 | 西德劳柔性包装有限公司 | Multi-layered sheet formed with extrusion, apparatus for making same and pipes made of same |
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| Publication number | Publication date |
|---|---|
| CN102168774A (en) | 2011-08-31 |
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