Introduction to Industrial Automation

10.25   A Metal Plate Rolling Mill Machine 

and Control of Their Thickness

Figure 10.25 shows an arrangement for rolling metal plates. The hot metal is pushed and squeezed 

by two driving rollers A and B through which a metal sheet with thickness d = 5 mm (under ideal 

conditions) is produced. The compression roller A may apply (simultaneously with the rotation) 

three different forces F

-1A

, F

0A

, and F

+1A

 via the activation of relays C

1

, C

2

, and C

3

 respectively, and 

for which F

-1A

 < F

0A

 < F

+1A

 is valid. The compression roller B may apply two different forces, F

0B

 

and F

+1B

, via the activation of the relays C

4

 and C

5

, respectively, and for which F

0B

 < F

+1B

 is valid. 

The thickness of the metal sheet is measured with a suitable analog sensor, the measurement of 

M

1

M

2

RS

0–1

PS

1

M

1

M

2

PS

2

0 V

0 V

+24 V DC

+24 V DC

PS

1

PS

2

I1.0

Q3.1

PLC

Inputs

Outputs

Q3.2

I2.1

I2.2

Processing

station