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Lecture 5_Hydraulic Systems of Machine Tools

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ppt lecture hydraulic systems
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  1 Hydraulic Systems of Hydraulic Systems of Machine ToolsMachine Tools  2 Hydraulic Systems of Machine Tools ã Hydraulic systems are now ever more widely used in machine tools as principal and feed movement drives, speed-changing devices, braking mechanisms, clamping devices, automatic control of machining cycle, etc. ã Hydraulic systems become the main type of drive in machine tools like grinders, shapers, copying millers, broaching machines, etc.  3 Hydraulic Systems of Machine Tools ã This extensive use of hydraulic systems is due to their capability of: – providing infinitely variable speed over a wide range, – smooth reversal of moving machine members, – automatic overload protection, – easy lubrication, etc.  Hydraulically controlled machine tools take less floor space, and  their parts and units can be easily standardized.  4 Hydraulic Systems of Machine Tools ã mong their shortcomings are: – leakage of hydraulic fluid through seals and gaps, – ingress of air into fluid, – effects of temperature and time on fluid properties, etc.
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