A cone-type piercing mill was developed by the authors for materials with poor hot workability. This piercing mill is called “the super piercer” in Europe. It has a pair of cone-type main rolls supported at both ends with their roll axes inclined and crossed so as to enable piercing at high feed and cross angles. In order to ensure the best performance of the rotary piercing, disc rolls are adopted instead of plate guide shoes. The super piercer was put into practice at the small-diameter seamless tube plant operated in 1983. The recent progress in our research and development on the super piercer has resulted in the concept of “the new super piercer,” which allows expansion piercing. Namely, the development of the skewing technology for disc roll axes and its application to the cone-type piercing technology has realized remarkable increase in the expansion ratio. The new super piercer was adopted as the core technology of the new medium-diameter seamless tube plant operated in 1997. In this paper, studied in detail were the influences of the expansion ratio, feed and cross angles on the rotary forging effects, redundant shear deformations and power consumption.

Issue Section:
Research Papers
Topics:
Deformation, Disks, Energy consumption, Forging, Industrial research, Shear (Mechanics), Workability
1.
Tanaka, T., Hemmi, K., Hayashi, C., Utakoji, M., and Nishikawa, K., “Development of Sumitomo Super Piercing Mill and Comprehensive Manufacturing Technology of Seamless Tube,” Research and Development in Japan awarded the Okochi Memorial Prize, 1985, pp. 34–38.
2.
Hayashi, C., Utakoji, M., and Yoshioka, K., “Development and Features of Sumitomo Super Rotary Piercing Mill,” Proc. the 3rd International Conference on Steel Rolling, Tokyo, 1985, pp. 57–62.
3.
Hayashi, C., “Progress in Technology of Tube Rolling,” Proc. International Conference on Modernization of Steel Rolling, Beijing, 1989, pp. 57–62.
4.
Hayashi
C.
, and
Yamakawa
T.
, “
Influences of Feed and Cross Angle on Rotary Forging Effects and Redundant Shear Deformations
,”,
Iron and Steel Institute of Japan Int.
Vol.
37
,
1997
, pp.
146
–
152
.
5.
Hayashi
C.
, and
Yamakawa
T.
, “
Influences of Feed and Cross Angle on Inside Bore and Lamination Defects in Rotary Piercing for Materials with Poor Hot Workability
,”
Iron and Steel Institute of Japan Int.
, Vol.
37
,
1997
, pp.
153
–
160
.
6.
Hayashi
C.
, and
Yamakawa
T.
, “
Comparison of Double and Single Piercing Process in Seamless Steel Tube Manufacture
,”
Material Science Research Int.
, Vol.
3
,
1997
, pp.
143
–
150
.
7.
Oberem
K.
, “
Das Schra¨gwalzwerk als Lochaggregat beim Rohrwalzen
,”
Stahl und Eisen
, Vol.
107
,
1987
, No.
16
, pp.
733
–
736
.
8.
Oberem
K.
, “
The Cross-Rolling Mill as a Piercing Unit.—Developments during the last 15 years
,”
Metallurgical Plant and Technology
, Vol.
4
,
1987
, pp.
80
–
85
.
9.
Voswinckel, G., “Developments in the Field of Piercing Billets for Seamless Tube Making,” Tube and Pipe Technology—USA, March–April, 1991, pp. 20–32.
10.
Hayashi
C.
,
Akiyama
M.
,
Yamakawa
T.
,
Tsumura
S.
, and
Shimoda
K.
, “
Influences of Expansion Ratio on Inside Bore and Lamination Defects in Expansion Piercing for Materials with Poor Hot Workability
,”
Iron and Steel Institute of Japan Int.
, Vol.
37
,
1997
, pp.
146
–
150
.
11.
Hayashi
C.
, and
Yamakawa
T.
, “
Influences of Expansion Ratio, Rotary Forging Effects and Redundant Shear Deformations on Inside Bore Defects in Materials with Poor Hot Workability
,”
Material Science Research Int.
, Vol.
3
,
1997
, pp.
151
–
157
.
12.
Okamoto, T., Hayashi, C., and Nishiguchi, M., “Piercing Rolling Apparatus for Producing Rolled Material free from Surface Torsion,” JP Patent 808,493, US Patent 3,719,066, GB Patent 1,320,035.
13.
Hayashi, C., “Method of Piercing in Seamless Tube Manufacturing,” JP Patent 1,608,310, US Patent 4,470,282, GB Patent 2,096,505.
14.
Hayashi, C., “Method of Piercing and Manufacturing Seamless Tubes,” JP Patent 1,812,697, US Patent 4,827,750, GB Patent 2,202,778.
15.
Yamakawa, T., Hayashi, C., and Shimoda, K., “Piercing Rolling Method and Apparatus for Seamless Steel Tube,” JP Application 5-274572, US Patent 5,636,542.
This content is only available via PDF.
Copyright © 1999
 by The American Society of Mechanical Engineers
You do not currently have access to this content.