Challenge 2008

1. Challenge 2008 Results
2. Challenge in Figures
3. Local Prizes
4. The Challenge Explained
5. The Challenge
6. Challenge Help
7. Cost Calculation
8. Challenge Rules

In the simulation, you are only required to roll part of the entire order of 25 plates for each section.

The results that you achieve for this part order are therefore scaled up to give a cost for the entire order of 25 plates. This scaling is based on both material and time costs, as follows.

Material costs

This is simply the total cost of the material, which constitute slab build-up you specify in the setup screen. It is important to calculate you slab dimensions carefully, because you will be penalized on cost if:

• Your slabs are too large for the given order item, so you will waste material.
• Your slabs are too small, so you will not produce the number of saleable plates you expected.

Time costs

The mill time is charged at a rate of $60,000 per hour. By using the mill efficiently, you aim to maximize your throughput (material rolled, in tonnes per hour) and hence minimize the cost per tonne of produced plate.

Example:

In your seutp screen, you plan to roll 18 plates using a slab build-up of:

• ID1 4 slabs: 305×1900×2000 mm (slab mass = 9.10 tonnes, 3 plates per slab)
• ID2 3 slabs: 305×1900×1500 mm (slab mass = 6.82 tonnes, 2 plates per slab)

The simulation will automatically select the larger slab (ID1), since this is the more challenging of the two cases.

On the Rolling Schedule screen, the minimum possible rolling time will be displayed. In this example, let’s assume a value of 300 seconds.

If, in the simualtion, you manage to roll 3 plates from slab ID1 in 320 s, your performance (minimum possible time/actual time) is therefore 93.75%. This performance is then used to determine the total cost of all the plates: