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Despising as well as casting rolling a technology has been that metallurgy material studies one item forward position technology of field inner , unique superiority has got the all the countries in the world broad pay close attention to and study, and has got the position replacing tradition ingot casting hot-rolling law stability step by step since are what the person has. Minitype rolling mill exploitation has gone to the lavatory for the experiment and scientific research have provided quite a few , the improvement the main body of a book has been carried out on present use rolling mill of precise copper of our university laboratory, has adopt gear wheel deflection falling-in way to have realized rolling mill controlling to rolling thickness , the rolling mill improving the day afer tomorrow has adopt three set of gear wheels to be engaged , two set of gear wheels axes among them may slide respectively along the erect sliding rail and the arc sliding rail , come true thereby to c