CN101181727A - Process for making stainless steel thin-wall seamless elbows - Google Patents
Process for making stainless steel thin-wall seamless elbows Download PDFInfo
- Publication number
- CN101181727A CN101181727A CNA2007101645511A CN200710164551A CN101181727A CN 101181727 A CN101181727 A CN 101181727A CN A2007101645511 A CNA2007101645511 A CN A2007101645511A CN 200710164551 A CN200710164551 A CN 200710164551A CN 101181727 A CN101181727 A CN 101181727A
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- elbow
- tube
- stainless steel
- neck bush
- wall
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Branch Pipes, Bends, And The Like (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a processing technique of a thin-wall seamless steel elbow. The invention is characterized in that: during the process that a stainless steel tube is pushed into the elbow mold, the tube is internally provided with a neck bush with the same diameter as the internal diameter of the tube, and then the stainless tube is positioned in the elbow mold, and pushed into the elbow mold through a hydraulic machine till the stainless steel elbow is molded. Since the tube is internally provided with the neck bush during the process that a stainless steel tube is pushed into the elbow mold, the diameter of the neck bush is the same as the internal diameter of the tube, and the neck bush is also internally provided with a reinforced bar to improve anti-extrusion strength; therefore, during the molding process of the elbow of the steel tube, if the tube wall can not bear the propelling force of the hydraulic machine, the neck bush can block off the inward extrusion of the tube wall to prevent the tube wall from expanding and deforming during the molding process. The successful experiment of the product fills the blank of large caliber stainless steel seamless elbow of China, changes the situation that China can not produce and needs to import large caliber stainless steel seamless elbow, which saves foreign exchange for China and cuts down cost for customers.
Description
Technical field: involved in the present invention is a kind of by the cold invention that pushes away the manufacture craft that is shaped to stainless steel jointless thin-walled elbow of stainless steel jointless thin-wall steel tube.
Background technology: in the prior art, stainless steel thin-wall seamless elbows is widely used in the corrosion-resistant pipeline of industry devices such as petrochemical industry, petroleum gas, chemical industry, chemical fertilizer, papermaking, pharmacy, food.Stainless steel thin-wall seamless elbows, the particularly bore thin-wall seamless elbows more than 200mm, manufacture difficulty is very big, because in the bend forming process, the stainless-steel pipe of thin-walled holds pressure that can't stand that hydraulic press is huge, can occur gauffer in mould, distortion.For the ease of processing, all use the steel pipe of a thick ancient piece of jade, round, flat and with a hole in its centre to make thick-wall elbow and be applied on the sheet-metal duct, as 16 " wall thickness of the thick-wall elbow of (bore ≈ 400mm) is 10mm, and the wall thickness of the thin-walled elbow of same specification 5mm only; therefore there is wasting phenomenon, also increases the cost of material simultaneously.In addition, the sheet-metal duct thickness of steel pipe of thick-wall elbow and pipeline is inconsistent, connects very difficult, make troubles for Unit Installation and maintenance, and form the inner-walls of duct height, accumulate the corrosive medium of carrying in the pipeline, shorten pipeline corrosion-resistant service life, consumers' opinions is bigger.In order once to adopt thin-walled that seam elbow is arranged, promptly struck out two lobes of elbow earlier in the past, again through being welded with wall thickness, owing to there is the welding quality of seam elbow to be difficult to guarantee, mechanical strength is low, welds drawbacks such as afterwards yielding and weld seam poor corrosion resistance, can not satisfy the requirement of important chemical plant installations pipeline.The domestic ball pushing moulding process that also once adopted is made stainless steel thin-wall seamless elbows, the material attenuate amount of ball pushing moulding process is more than 30%, high material consumption cost height, because ball pushes away main excircle by ball and tube wall and is line and contacts ball and push into type, need just to make elbow through ball pushing repeatedly, repeatedly ball pushes away the damage of material greatlyyer, and product quality is difficult to guarantee, and production efficiency is low, and the user also dislikes using ball to push into the type thin-wall seamless elbows.
Summary of the invention: in view of the existing problem of known technology, technical problem solved by the invention be for provide a kind of make elbow save material, to the manufacture craft of material not damaged, Forming Quality is good, qualification rate is high and production efficiency is high stainless steel thin-wall seamless elbows.In order to realize reaching above-mentioned technique effect, the present invention realizes in the following way: the manufacture craft of this kind stainless steel thin-wall seamless elbows, it is characterized in that in the elbow module progradation, being provided with and the equal-sized neck bush of pipe diameter in this steel duct at stainless-steel pipe, then stainless-steel pipe is arranged in the elbow module, then stainless-steel pipe is advanced in elbow module until moulding by hydraulic press, because the present invention is being provided with neck bush with stainless-steel pipe in steel pipe in the elbow module progradation, the inner diameter equal and opposite in direction of the size of this neck bush and steel pipe, and this bush inside also is provided with the intensity that is extruded that reinforcement increases lining, like this, steel pipe is in the bend forming process, if tube wall holds under the situation that can't stand the hydraulic press propulsive force, lining then plays the extruding force that stops that tube wall is inside, and tube wall can be out of shape in the bend forming process.Trial-produceing successfully of this product filled up the blank of China's large-caliber stainless steel thin-wall seamless elbows, changed the domestic situation that can't produce dependence on import of large-caliber stainless steel thin-wall seamless elbows, for country saves foreign exchange, for the user has reduced cost.
Description of drawings: the present invention has following accompanying drawing;
Fig. 1 is the structural representation of progradation of the present invention.
The specific embodiment: the relevant details of describing embodiment now, the manufacture craft of this kind stainless steel thin-wall seamless elbows, be earlier stainless-steel pipe to be arranged in the elbow particular manufacturing craft, be provided with and the equal-sized a plurality of neck bush 1 of pipe diameter in this steel duct then, by hydraulic press stainless-steel pipe 2 is advanced in elbow module plug 3 until moulding then, in progradation, steel pipe 2 can move forward, neck bush 1 then can slowly come off out in steel pipe, at this moment, the operator just can as long as take out neck bush.
Claims (1)
1. the manufacture craft of a stainless steel thin-wall seamless elbows, it is characterized in that in the elbow module progradation, being provided with and the equal-sized neck bush of ips at this tube interior at the stainless steel pipe, then the stainless steel pipe is arranged in the elbow module, then the plug position of stainless steel pipe to elbow module is advanced until moulding by hydraulic press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101645511A CN101181727A (en) | 2007-12-06 | 2007-12-06 | Process for making stainless steel thin-wall seamless elbows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101645511A CN101181727A (en) | 2007-12-06 | 2007-12-06 | Process for making stainless steel thin-wall seamless elbows |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101181727A true CN101181727A (en) | 2008-05-21 |
Family
ID=39447230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101645511A Pending CN101181727A (en) | 2007-12-06 | 2007-12-06 | Process for making stainless steel thin-wall seamless elbows |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101181727A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198460A (en) * | 2011-02-23 | 2011-09-28 | 上海华钢不锈钢有限公司 | Device for machining thin-walled seamless elbow of stainless steel U-tube |
| CN102690939A (en) * | 2011-03-25 | 2012-09-26 | 上海凯科管业有限公司 | Production process of stainless steel seamless bend |
| CN115781196A (en) * | 2022-12-14 | 2023-03-14 | 江苏志得管业有限公司 | Cold machining process for pipe fitting elbow structure |
-
2007
- 2007-12-06 CN CNA2007101645511A patent/CN101181727A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198460A (en) * | 2011-02-23 | 2011-09-28 | 上海华钢不锈钢有限公司 | Device for machining thin-walled seamless elbow of stainless steel U-tube |
| CN102690939A (en) * | 2011-03-25 | 2012-09-26 | 上海凯科管业有限公司 | Production process of stainless steel seamless bend |
| CN102690939B (en) * | 2011-03-25 | 2014-02-26 | 上海凯科管业有限公司 | Production process of stainless steel seamless bend |
| CN115781196A (en) * | 2022-12-14 | 2023-03-14 | 江苏志得管业有限公司 | Cold machining process for pipe fitting elbow structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080521 |