JPS56162610A - Molding method of bend - Google Patents
Molding method of bendInfo
- Publication number
- JPS56162610A JPS56162610A JP6674480A JP6674480A JPS56162610A JP S56162610 A JPS56162610 A JP S56162610A JP 6674480 A JP6674480 A JP 6674480A JP 6674480 A JP6674480 A JP 6674480A JP S56162610 A JPS56162610 A JP S56162610A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- inner pressure
- bend
- rotary
- straight tube
- Prior art date
- 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.)
- Granted
Links
- 238000000465 moulding Methods 0.000 title abstract 4
- 238000000034 method Methods 0.000 title 1
- 238000005452 bending Methods 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 230000037303 wrinkles Effects 0.000 abstract 2
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
Landscapes
- Moulding By Coating Moulds (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
PURPOSE: To obtain a bend having neither uneven thickness nor inner surface wrinkles, by forming an unhardened straight tube centrifugally at the inner surface of a rotary mold, removing it from the rotary type by inserting a film tube therein, and then bending it in a bend molding to work while decreasing the inner pressure of the tube.
CONSTITUTION: A straight tube 2 made of unhardened resin is centrifugally formed at the inner surface of a rotary die 1. After the insertion of a film tube 8 therein, a compressed air is injected to keep an inner pressure A. Then, the rotary die 1 is split for removing from the straight tube, whereby said straight tube is charged in a bend molding 19 decreasing the inner pressure to an inner pressure B. The tube 8 is provided with a margine for extension due to the decrease of the inner pressure, and at a bending work time the outer arc side extends, thereby being able to prevent the occurrence of wrinkles at the inner surface of the tube. Then, the rotary molding is performed using an axis 21 as a center by increasing the inner pressure (smaller than the inner pressure A). Thus, the bend is obtained followed by heat hardening.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6674480A JPS56162610A (en) | 1980-05-19 | 1980-05-19 | Molding method of bend |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6674480A JPS56162610A (en) | 1980-05-19 | 1980-05-19 | Molding method of bend |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56162610A true JPS56162610A (en) | 1981-12-14 |
| JPS6138025B2 JPS6138025B2 (en) | 1986-08-27 |
Family
ID=13324680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6674480A Granted JPS56162610A (en) | 1980-05-19 | 1980-05-19 | Molding method of bend |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56162610A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499045A (en) * | 1981-08-06 | 1985-02-12 | Solvay & Cie (Societe Anonyme) | Process for the production of tubes of a molecularly oriented plastic |
-
1980
- 1980-05-19 JP JP6674480A patent/JPS56162610A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4499045A (en) * | 1981-08-06 | 1985-02-12 | Solvay & Cie (Societe Anonyme) | Process for the production of tubes of a molecularly oriented plastic |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6138025B2 (en) | 1986-08-27 |
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