CS243910B1 - Tubes cold bending method - Google Patents
Tubes cold bending method Download PDFInfo
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- CS243910B1 CS243910B1 CS84790A CS79084A CS243910B1 CS 243910 B1 CS243910 B1 CS 243910B1 CS 84790 A CS84790 A CS 84790A CS 79084 A CS79084 A CS 79084A CS 243910 B1 CS243910 B1 CS 243910B1
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- pipe
- filled
- die
- tube
- cold bending
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Abstract
Očelom vynálezu je zabránenie zvlnenia a praskania rúr v mieste ohybu. Uvedeného účelu sa dosiahne tým, že rúra sa vyplní materiálom z nízkotavitelnej zliatiny, v ktorom sa po stuhnutí vytvoří slepá diera a táto sa naplní kvapalinou. Působením trna na otvorený koniec rúry sa táto vtlačí do zakřivené] priebežnej dutiny vytvorenej v zápustke.It is an object of the invention to prevent undulation and cracking of pipes at the bend. the purpose is achieved by filling the oven low-melting alloy material in which after solidification, a blind hole is formed and this is made is filled with liquid. Thorn on the open end of the pipe is pressed into the curved] of a continuous die formed in the die.
Description
(54) Sposob ohýbania rúr za studená(54) Cold bending method
Účelom vynálezu je zabránenie zvlnenia a praskania rúr v mieste ohybu. Uvedeného účelu sa dosiahne tým, že rúra sa vyplní materiálom z nízkotavitelnej zliatiny, v ktorom sa po stuhnutí vytvoří slepá diera a táto sa naplní kvapalinou. Působením trna na otvorený koniec rúry sa táto vtlačí do zakrivenej priebežnej dutiny vytvorenej v zápustke.The purpose of the invention is to prevent corrugations and rupture of the pipes at the bend. This is achieved by filling the pipe with a low-melting alloy material in which, after solidification, a blind hole is formed and filled with liquid. By acting of the mandrel on the open end of the pipe, it is pressed into a curved continuous cavity formed in the die.
Vynález rieši sposob ohýbania rúr za studená, zvlášť vhodný pre rúry z vysokopevného materiálu.The invention provides a method for cold-bending pipes, particularly suitable for pipes of high-strength material.
V súčasnosti sa najčastejšie ohýbajú rúry za studená v různých ohýbacích prípravkoch, pričom sa ohýbaná rúra za účelom zamedzenia práskania, resp. zvlnenia v mieste ohybu, vyplní buď sypkým materiálom, alebo pružnými prvkami. Napriek týmto opatreniam rúry z vysoikopevného materiálu v mieste ohybu praskajú. Ďalšou nevýhodou tohoto sposobu je, že si vyžaduje široký sortiment pružných prvkov podlá vnútorného priemeru ohýbaných rúr.At present, cold tubes are most often bent in various bending jigs. crimped at the bend, filled with either bulk material or elastic elements. Despite these measures, pipes of high-strength material burst at the bend. A further disadvantage of this method is that it requires a wide range of flexible elements according to the inner diameter of the bent pipes.
Uvedené nevýhody odstraňuje sposob ohýbania rúr za studená, ktorého podstata spočívá v tom, že rúra sa vyplní materiálom z nízkotavitelnej zliatiny a jeden koniec rúry sa zatemuje. Po stuhnutí sa v zliatine zhotoví slepé diera, ktorá sa naplní kvapallnou a takto připravená rúra sa zatemovaným koncom vloží do zápustky, v ktorej je vytvořená priebežné dutina takého tvaru do akého potřebujeme ohnúť rúru. Tlakom třňa na otvorený koniec rúry, ktorého osadený koniec má priemer menší ako je vnútorný priemer ohýbanej rúry avšak vačší ako je priemer slepej diery, sa rúra vtlačí do zakřivenoj časti dutiny zápustky.The above-mentioned disadvantages are eliminated by the cold-bending method of the pipe, which is based on the fact that the pipe is filled with low-melting alloy material and one end of the pipe is obscured. After solidification, a blind hole is made in the alloy, which is filled with liquid, and the tube thus prepared is inserted into the die with the blackened end in which a continuous cavity is formed in the shape to which the tube needs to be bent. By pressing the mandrel against the open end of the pipe, the stepped end of which has a diameter smaller than the inner diameter of the bent pipe but larger than the diameter of the blind hole, the pipe is pressed into the curved portion of the die cavity.
Výhoda ohýbania rúr sposobom podlá vynálezu je v tom, že vnútorný přetlak kvapaliny vytvára priestorové n,apatie, ktoré zabraňuje vlneniu a praskaniu ohýbaných rúr v mieste ohybu.The advantage of bending the pipes according to the invention is that the internal pressure of the liquid creates a spatial ap apathy that prevents the bent pipes from ripping and cracking at the bend.
Na výkrese je znázorněná v řeze rúrka vpravená do dutiny zápustky.In the drawing, a tube is inserted in the die cavity.
Rúra 5 odřezaná na požadovanú dížku sa vyplní materiálom 3 z nízkotavitelnej zliatiny. Po stuhnutí zliatiny sa jeden koniec rúry zatemuje a v nízkotavitelnej zliatine sa zhotoví slepá diera 4 s priemerom přibližné 0,75 priemeru ohýbanej rúry a ukončí sa přibližné vo vzdialenosti 1,5 priemeru ohýbanej rúry od jej zatemovaného konca 6. Do vyvřtanej slepej diery 4 sa naleje olej a rúra 5 sa vloží do dutiny 7 delenej zápustky 2. Po uzavretí zápustky 2 sa rúra 5 vtlačí třňom 1, ktorého osadený koniec 8 má priemer menší ako je vnútorný priemer ohýbaneij rúry 5, avšak vačší ako' je priemer slepej diery 4, vtlačí do zakrivenej časti 9 dutiny 7 zápustky 2.The pipe 5 cut to the desired length is filled with a low-melting alloy material 3. After the alloy has solidified, one end of the pipe is darkened and a blind hole 4 having a diameter of approximately 0.75 bent pipe diameter is made in a low-melting alloy and terminated at approximately 1.5 bend pipe diameter from its obscured end 6. Pour into the bore hole 4 the oil and pipe 5 are inserted into the cavity 7 of the split die 2. After closing the die 2, the pipe 5 is pressed through the mandrel 1, whose shoulder 8 has a diameter smaller than the inner diameter of the bending pipe 5 but greater than the diameter of the blind hole 4 into the curved portion 9 of the die cavity 7.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS84790A CS243910B1 (en) | 1984-02-03 | 1984-02-03 | Tubes cold bending method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS84790A CS243910B1 (en) | 1984-02-03 | 1984-02-03 | Tubes cold bending method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS79084A1 CS79084A1 (en) | 1985-09-17 |
| CS243910B1 true CS243910B1 (en) | 1986-07-17 |
Family
ID=5340673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS84790A CS243910B1 (en) | 1984-02-03 | 1984-02-03 | Tubes cold bending method |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS243910B1 (en) |
-
1984
- 1984-02-03 CS CS84790A patent/CS243910B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS79084A1 (en) | 1985-09-17 |
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