crushing operation is an important procedure in industrial materials processing， modern crushing works are completed on various kinds of crushing equipments，in cement industry，raw and clinkered materials must be proceed by crushing mills，the crushing process is essential in fire-resistant material manufacturing，thermal power generation ，chemical products，glass products，ceramics，and house construction and road construction industries，the advantages of roller type crushing mills are ；simple structure，easy made，less over-milled material，it still plays an important part in coal dressing，ore lump sintering，and cement industries，it is most suitable for mid rigidity and soft ore mini grain processing，especially，in processing the materials containing precious metals，for it requires very less argillization，it is most suitable to adopt roller type crushing mill，the mechanical structure twin-roller mill has following characteristics；1）low energy consuming，（2）satisfied granularity；（3）high crushing precision；（4）less over-milled grain；（5）simple structure，easy operation。it is suitable for milling mid-rigidity and soft ore，it is widely used in milling sintered ore ，cement，glass，ceramic industries，
crushing operation is an important procedure in industrial materials processing， modern crushing works are completed on various kinds of crushing equipments，in cement industry，raw and clinkered materials must be proceed by crushing mills，the crushing process is essential in fire-resistant material manufacturing，thermal power generation ，chemical products，glass products，ceramics，and house construction and road construction industries，the advantages of roller type crushing mills are ；simple structure，easy made，less over-milled material，it still plays an important part in coal dressing，ore lump sintering，and cement industries，it is most suitable for mid rigidity and soft ore mini grain processing，especially，in processing the materials containing precious metals，for it requires very less argillization，it is most suitable to adopt roller type crushing mill，the mechanical structure twin-roller mill has following characteristics；1）low energy consuming，（2）satisfied granularity；（3）high crushing precision；（4）less over-milled grain；（5）simple structure，easy operation。it is suitable for milling mid-rigidity and soft ore，it is widely used in milling sintered ore ，cement，glass，ceramic industries，关键词：（破碎crush，mill ），（ 过粉碎over-mill） （ 滚子roller） 对滚破碎机我来帮他解答（ 对辊twin-roller）
IntroductionMachining aims to generate the shape of work-piece form a solid body，or to improve the tolerances and surface finish of a previously formed work-piece，by removing excess materials in the form of Machining is capable of creating geometric configurations，tolerances， and surface finishes often unobtainable by any other However， machining removes materials， which has already been paid for， in the form of relatively small particles that are more difficult to recycle and are in greater danger of becoming Therefore，developments often aim at reducing or-if at all possible-eliminating machining， especially in mass For these reasons， machining has lost some important markets， yet， at the same time， it has also been developing and especially having captured new markets with the application of numerical Some feel for the important of machining may be gained from the observation that in 1983 there were about 2 million metal-cutting machine tools in the unite states ( of which some 5% were numerically controlled ) and that labor and overhead costs amounted to $125 billion， or 3% of the GNP
