JPS55112106A - Method and apparatus for ellipse type press roll piercing work - Google Patents
Method and apparatus for ellipse type press roll piercing workInfo
- Publication number
- JPS55112106A JPS55112106A JP1788179A JP1788179A JPS55112106A JP S55112106 A JPS55112106 A JP S55112106A JP 1788179 A JP1788179 A JP 1788179A JP 1788179 A JP1788179 A JP 1788179A JP S55112106 A JPS55112106 A JP S55112106A
- Authority
- JP
- Japan
- Prior art keywords
- caliber
- roll
- ratio
- breadth
- height
- 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
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
PURPOSE:To prevent the formation defects like as the wrinkle flaw, cracks, etc., caused in outer circumference of the hollow pipe blank, by making semiellipse the caliber of the reducing roll, by making large the axese ratio of the caliber, and by making small the ratio of roll diameter, in the press roll piercing method. CONSTITUTION:In the press roll piercing method, the roll caliber of the reducing roll facing each other is made a semiellipse type with long caliber breadth, and the pipe blank with ellipse type outer circumferential section is manufactured. Hereupon, the longest distance in the direction of depth of the roll caliber is taken as the caliber height H, and the caliber breadth B is made large so as to make large the ratio of the caliber breadth B against the height H, that is B/H (axes ratio of the caliber), and also, the caliber height H is specified small. The axes ratio B/H of the caliber is desirable to be about 1-1.3 or so. According to this method, the pipe blank of good quality free from the usual generation of over filling, wrinkle flaw, etc., can be manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1788179A JPS55112106A (en) | 1979-02-20 | 1979-02-20 | Method and apparatus for ellipse type press roll piercing work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1788179A JPS55112106A (en) | 1979-02-20 | 1979-02-20 | Method and apparatus for ellipse type press roll piercing work |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55112106A true JPS55112106A (en) | 1980-08-29 |
Family
ID=11956032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1788179A Pending JPS55112106A (en) | 1979-02-20 | 1979-02-20 | Method and apparatus for ellipse type press roll piercing work |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55112106A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5513511A (en) * | 1991-08-22 | 1996-05-07 | Kawasaki Steel Corporation | Method of producing seamless steel tube by using mandrel mill |
-
1979
- 1979-02-20 JP JP1788179A patent/JPS55112106A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5513511A (en) * | 1991-08-22 | 1996-05-07 | Kawasaki Steel Corporation | Method of producing seamless steel tube by using mandrel mill |
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