Roll Pass Designing in Continuous Bar Mills
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I have tried to outline some basics of roll pass designing in this presentation.
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Roll Pass Designing in Continuous Bar Mills
- 1. Presented by ANSAR HUSSAIN RIZVI Manager (Production) Roll Pass Designing in Continuous Bar Mill
- 8. Roll Pass Designing in Continuous Bar Mill Billet Size Area Finished Size Area of finished bar Co-efficient of elongation No. of passes 150 22500 12 113.1429 198.8636 20.78453 150 22500 16 201.1429 111.8608 18.52503 150 22500 20 314.2857 71.59091 16.77243 150 22500 22 380.2857 59.16604 16.02385 150 22500 25 491.0714 45.81818 15.01982 150 22500 28 616 36.52597 14.12972 150 22500 32 804.5714 27.9652 13.08094 150 22500 36 1018.286 22.09596 12.15586 150 22500 40 1257.143 17.89773 11.32834
- 18. Roll Pass Designing in Continuous Bar Mill
- 20. Roll Pass Designing in Continuous Bar Mill
Editor's Notes
- 21-Apr-09 Ansar Hussain Rizvi
- The ultimate goal of a roll pass designer is to ensure the production of the desired shape of a product with the appropriate internal structure, defect free surface and at lowest cost . 21-Apr-09 Ansar Hussain Rizvi
- Definite passes: Square, Round Intermediate passes: Box, Diamond, Oval 21-Apr-09 Ansar Hussain Rizvi
- Definite bar - intermediate pass = deformation Definite bar - intermediate pass definite bar = sequence 21-Apr-09 Ansar Hussain Rizvi
- A round pass does not make a round bar, normally the word bar indicates a finished product (finished bar) 21-Apr-09 Ansar Hussain Rizvi
- The deformation from I3 to C1 is a good example of square twisting, similarly when doing slit rolling, twisting of C6 square to enter into C7 dog bone pass is also the same case. 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- Co-efficient of elongation= Initial area/final area No. of passes = log of co-eff. Of elongation/log(1.29) 21-Apr-09 Ansar Hussain Rizvi
- Roughing mill 28” Roughing mill I1 to C4 Intermediate or stretching mill C5 to C10 Finishing mill 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- The purpose of bar rolling is to obtain a long product through changing its shape at each stand. The tri-dimensional deformation Spread, Elongation, Reduction 21-Apr-09 Ansar Hussain Rizvi
- f = (1.05-0.0005t) – for steel rolls f = 0.8(1.05-0.0005t) – for cast iron rolls reducing a round into an oval pass is a 'tri-dimensional process' implying that (beyond the obvious elongation) a circular cross section, for example round 14, is reduced to an almost ellyptical 17x8 cross section. The ratio 17/14 (in this case 1.214) is called coefficient of spread (Beta). 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- For example, before the reheating furnace our billet has cross-sectional area (120*120)-0.86*(16*16)=14180 mm^2; after the furnace, area is 14180*1.013^2=14551 mm^2. For a billet, I wouldn't talk of 'reduced diagonal': I would simply say 'diagonal'. From formula (2), d=156.4 mm (cold) or 158.5 mm (hot). 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi
- 21-Apr-09 Ansar Hussain Rizvi