Title:
HOT ROLLED BAR STEEL WITH SPIRAL RIB AND MANUFACTURE AND DEVICE THEREOF
Document Type and Number:
Japanese Patent JPH01148433
Kind Code:
A
Abstract:
PURPOSE: To form an anchor or a connecting member in short length by forming a screw whose rib is continuous and not interrupted. CONSTITUTION: For forming a continuous screw 2, in a hot rolling process, in a first working step, on the sides facing each other of a steel bar 1, ribs 2' and 2" respectively extended only on a part around a steel bar 10 are formed, and in a second working step immediately following this, ribs 2', 2" extended on an extent between them around the steel bar are formed. The both working steps are performed immediately following the rolling of the steel bar 1 under the utilization of rolling heat.
Inventors:
ERITSUHI RIHIARUTSU
Application Number:
JP26627988A
Publication Date:
June 09, 1989
Filing Date:
October 24, 1988
Export Citation:
Assignee:
DYCKERHOFF & WIDMANN AG
International Classes:
B21B1/16; B21H8/00; E04C5/03; E04C5/12; B21B35/02; (IPC1-7): B21B1/16; B21H8/00
Domestic Patent References:
| JPS5412486A | 1979-01-30 | |||
| JPS4532121Y1 | 1970-12-09 | |||
| JPS3633934Y1 | ||||
| JPS4415538Y1 | 1969-07-04 |
Attorney, Agent or Firm:
Mitsuyoshi Ezaki (1 person outside)