002 Latest Solutions and Advantages of the Endless Rod-Rolling Process (Figures).ppt

Billet Section:
150 mm x 150 mm
Output: 90 tph
Steel Grades:
 Commercial Grades
 High-Carbon Steels
 Welding Wires
 Cold-Heading
Figure 1: Billet Welder at Fundia, Finland
Finishing Block
Sizing Block
Flash Butt Welder
Deburring Machine
Reheat Furnace
Welder Travel
Garrett Line
Rod Line
Figure 2: Endless Rod Rolling at Xingtai, China
Head Tail Head Tail
Figure 3: Mill Entry Temperature Profile
Head Tail Head Tail
Figure 4: Block Entry Temperature Profile
INJECTOR
WATER
STRIPPER
AIR
STRIPPER
HIGH-PRESSURE
WATER FEED
DRAIN
MILL AIR
LOW-
PRESSURE
WATER
FEED
SPRAY NOZZLE
Figure 5: Cross Section Through Cooling Zone
Head
Tail
1040°C
1000°C
Head
Tail
1000°C
980°C
Head
Tail
960°C
960°C
Head
Tail
940°C
940°C
Figure 6a: Initial Temperature Difference
Figure 6b: Temperature Difference after First Pipe
Figure 6d: Temperature Difference after Third Pipe
Figure 6c: Temperature Difference after Second Pipe
Figure 6: Temperature Difference Between Head and Tail End
WEDGE
MECHANISM
HYDRAULIC MOTOR
(Roll-Gap Adjustment)
DRIVE SHAFT
ROLL SHAFT
HYDRAULIC CYLINDER
ROLL-GAP
ADJUSTMENT
Figure 7: Cross Section Through Mill Stand
Influence
Comments
Material
Small effect on shape and roll bending
Ingoing Section
High importance – see Note 1
Temperature
Affects rolling load
Roll Centres
Direct relationship to size
Roll Diameter
Small effect
Roll Alignment
Cannot be rectified by gap control
Roll Concentricity
Cannot be rectified by gap control
Roll Wear
Direct relationship to size
Stand Stiffness
Will be constant but effect is proportional to rolling load
Pass Design
Cannot be rectified by gap control
Rolling Load
Determined by other influences – see Note 2
Speed
Will affect strain rate and temperature increase.
Interstand Tension
High importance – See Note 3
Interstand Cooling
Directly affects temperature
Table 1: Factors Affecting Shape
Operator Control
Station
Terminal
Box
Industrial
PC
Profibus
RS