Short-Stress Rolling Mill

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Short-Stress Rolling Mill

The shorter the stress line in the mill stand, the smaller the amount of elastic deformation is generated, the greater the rigidity of the hot rolling machinery and the higher the precision of the rolled product.  It is a new type of houseless short-stress rolling mill, suitable for small and medium-sized rolling mill renovation, and also for small continuous rolling and semi-continuous rolling plants. For example, in a small semi-continuous rolling mill with an annual output of 150,000 to 200,000 tons, 1202 and 1502 continuous casting billets are used, the rough rolling mill is with the roll diameter is Ф500mm×2, and the rolled parts after cutting head by flying shear enter the diameter Ф350×4 and the diameter Ф300×4 continuous rolling mills. 

What's the shot-stress rolling mill mean?

The rolling force received by the rolling mill forms a closed-loop (i.e. the stress line) through the internal stress of each stressed component such as the roll, roll bearing, box, copper nut, and tie rod. The rolling mill base and the down rolling mechanism are not subject to rolling force, and the stress line is shorter than that of an ordinary rolling mill, which improves the strength of the rolling mill and reduces the elastic deformation of the rolling mill, so it is called a "short stress line rolling mill".

Specification

Model

SY-225

SY-228

SY-230

SY-232

SY-235

SY-240

SY-250

SY-255

Roll Dia. (mm)

250

280

300

320

350

400

500

550

Small

245

260

280

290

320

380

430

500

Big

280

320

340

360

380

450

560

580

Roll neck dia. (mm)

150

160

180

190

200

250

280

320

Rolling Torque per roll    (KN/m)

16

20

30

45

55

75

100

200

Rigidity  coefficient (KN/m)

740

850

940

1200

1400

2000

2800

4000

Roll length (mm)

450

450

450

450

600

750

900

950

Rolls weight  (T)

2.7-3

3.1-3.5

4-4.5

4.3-4.8

5.5-6.5

7.2-8

11-12.5

15.5-17.5

Stand weight (T)

1.5-2.5

1.8-3

2.3-3.5

2.5-3.7

3-4

3.5-4.5

3.7-5

4.6-6

 

Comparison of short stress line rolling mills and housing rolling

1. Short stress loop and high rigidity ensure high precision of the product and easy realization of negative deviation value.

2. There are forward and reverse threads in the two ends of the column, which can realize the alignment adjustment; the rolling centerline is unchanged, which can improve the operation rate, save the time for maintenance and replacement of the guide beam, reduce the operating accidents, and avoid rolling elbows, impacts and entanglements and other process accidents to extend guide lifespan.

3.Easy axial adjustment and small axial clearance.

4. Balance spring is used, the balancing force is constant, and the spring is compact in the bearing seat.

5. The roll system of the intermediate mill is pre-installed and adjusted before changing the rolls. After the stop of the new roll system, the rolling mill has a good pre-adjustment performance, fast roll change and high yield.

6. The bearing seat is automatically adjusted, and the four-row cylindrical bearing is balanced to increase the bearings life.

 

 

 

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