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This paper proposes a fuzzy interstand tension control scheme for roughing and intermediate rolling mills to deal with the first problem mentioned above. The proposed scheme detects the changes in the motor current and corrects the motor speed of the upstream stand based on approximate human reasoning to remove speed mismatch.
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In conventional hot strip production, slabs of thickness of about 250mm are heated in a furnace and are reduced to 30 to 60mm in thickness after passing through the roughing mill, and then further reducing it to within a range of to by rolling in the finishing mill.
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Another popular roughing operation, often referred to as optimized roughing, removes material even faster than highfeed milling to produce part geometries close to the desired shapes. Then, a followup operation can produce the final geometry and surface finish. Optimized roughing combines deep cut depths with light radial engagement.
Mar 12, 2011· I would not rely on a vertical mill with an R8 spindle to handle a heavy roughing cutter which is what works great for tube notching. I actually bought a small horizontal mill specifically for tube nothing (roll cages) as to avoid damaging my Bp's spindle. A good H Mill will notch tube in roughly 23 seconds. I would not risk damage to your mill.
On the unloaded mill there is no force before the slab or the strip arrives into the roll bite, therefore the gap has to be preset with an anticipated mill stretches. The anticipated mill stretch depends on the strip characteristics (size, material) and can be calculated using a high level system.
Heavy Duty Resolver Keeps Steel Mill Rolling. Steel mills pose challenging conditions for motion feedback. A prime example is the hot rolling process which starts with heating 8inch thick slabs of steel in a furnace to about 2250°F.
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Mini mill plants may specialize, for example, in making coils of rod for wiredrawing use, or pipe, or in special sections for transportation and agriculture. Capacities of mini mills vary: some plants may make as much as 3,000,000 tons per year, a typical size is in the range 200,000 to 400,000 tons per year, and some old or specialty plants may make as little as 50,000 tons per year of finished product.
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