JPS57206520A - Cylindrical body forming method - Google Patents
Cylindrical body forming methodInfo
- Publication number
- JPS57206520A JPS57206520A JP8887781A JP8887781A JPS57206520A JP S57206520 A JPS57206520 A JP S57206520A JP 8887781 A JP8887781 A JP 8887781A JP 8887781 A JP8887781 A JP 8887781A JP S57206520 A JPS57206520 A JP S57206520A
- Authority
- JP
- Japan
- Prior art keywords
- punch
- cylindrical body
- diameter part
- degree
- forming
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
PURPOSE:To improve a degree of a true circle and a degree of a cylinder of a cylindrical body raw material, and its yield, by forming it by use of a multistage punch to which a punch having roundness on its outside circumference and also a diameter corresponding to the inside diameter of the cylindrical body raw material has been connected coaxially. CONSTITUTION:Press forming is executed by pushing a punch 4 into the inside diameter part of a cylindrical body raw material 2 from the upper part, or drawing it out. In this case, at first, the inside diameter part of the cylindrical body is formed by a punch 4a of the lower side, a part which has been a short diameter part at first becomes a long diameter part, and a part which has been a long diameter part at first becomes a short diameter part. Since forming by an upper side punch 4b is execured immediately after the lower side punch 4a, however, flow of a material in case if forming by the lower side punch 4a is limited by the succedding upper side punch 4b, and both a degree of a true circle and a degree of a cylinder are improved remarkably.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8887781A JPS57206520A (en) | 1981-06-11 | 1981-06-11 | Cylindrical body forming method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8887781A JPS57206520A (en) | 1981-06-11 | 1981-06-11 | Cylindrical body forming method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57206520A true JPS57206520A (en) | 1982-12-17 |
Family
ID=13955225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8887781A Pending JPS57206520A (en) | 1981-06-11 | 1981-06-11 | Cylindrical body forming method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57206520A (en) |
-
1981
- 1981-06-11 JP JP8887781A patent/JPS57206520A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK578285A (en) | pipefitting | |
ES279780U (en) | Container of tubular form | |
JPS56144830A (en) | Production of diaphragm bellows | |
JPS6487024A (en) | Can body production unit | |
ES445566A1 (en) | Pipe bell end having a thickened portion and apparatus for forming the bell end | |
JPS5530357A (en) | Production of v-pulley | |
JPS56147624A (en) | Improved ultrahigh pressure apparatus | |
JPS57206520A (en) | Cylindrical body forming method | |
JPS5623324A (en) | Preparation of roller | |
JPS5310173A (en) | Apparatus for separating solid from suspension | |
JPS56154237A (en) | Manufacture of nut with flange | |
JPS569028A (en) | Forming device of end of pipe joint | |
JPS53136076A (en) | Fabrication of synthetic resin pipe | |
JPS57165155A (en) | Molding method for hollow cylindrical swaged material | |
JPS5436384A (en) | Forming of end part of pipe | |
IE790295L (en) | Metal drum | |
JPS57206537A (en) | Manufacture of external member of tripod type uniform flexible joint | |
JPS5623323A (en) | Press forming method of metal plate material | |
JPS53146257A (en) | Former for stepped end portion of cylindrical body | |
JPS5639131A (en) | Manufacture of coaxial reducing pipe | |
JPS5764420A (en) | Formation of pipe flange of thin-wall metallic pipe | |
JPS57187119A (en) | Method for eccentric contraction working of pipe | |
JPS5545588A (en) | Manufacture of cylindrical body with flange or flare | |
JPS57187122A (en) | Cylinder draw die and its forming method | |
JPS5540073A (en) | Burring work method of metallic plate |