机械制造技术英文PPT (31).ppt
Selection of surface machining methodsMachanical Manufacturing technologyProcessing Craft Route FormulationConceptThe processing craft route of part machining refers to the sequence of processes from blank to finished product in the process of part production.Process chart of processing craft route formulationMachined surfaces of partObtaining methods of various surfaces with different technical requirementsABCDDetermination of surface processing methods and stepsA1A2A3B1B2C1C2C3C4D1D2Determination principle of processing sequenceMachined surfaces of partA1C1B1C2D1A2C3B2D2A3C4Principle of process concentration and process dispersionProcessing Craft Route CompletationProcess 6A3C4Process 5D2Process 3D1Process 2C2Process 1A1C1B1Process 4A2C3B2Surface to be machined：AllA：RoughingSemi_finishingfine finishing（1.6）B：RoughingSemi_finishing（6.3）C：RoughingSemi_finishingfine finishing（1.6）200 outer circle：RoughingSemi_finishing（3.2）60 hole：RoughingSemi_finishing（1.6）The rest：RoughingProcessing sequence：（1）Rough turning and semi_finish turning end face C、200 outer circle,Rough boring and semi_precision boring 60 hole、Finish turning end face C;（2）Reversing,rough turning end face A、96 outer circle、end face B,Semi_finish turning end face A、end face B,Finish turning end face A（Turning machine）（3）Draw the inner keyway line and hole centerline of 620;（4）Machining slot（Slotting machine）（5）Drill hole of 6 20（Drilling machine）（6）Chip removing（File bench）（7）InspectionProcessing Craft RouteProcess 1（1）Rough turning and semi_finish turning end face C、200 outer circle,Rough boring and semi_precision boring 60 hole、Finish turning end face C;（2）Reversing,rough turning end face A、96 outer circle、end face B,Semi_finish turning end face A、end face B,Finish turning end face A（Turning machine）Process 2：Draw the inner keyway line and hole centerline of 620;Process 3：Machining slot（Slotting machine）Process 4：Drill hole of 6 20（Drilling machine）Process 5：Chip removing（File bench）Process 6：InspectionSelection of surface machining methodsConceptThe choice of surface machining method is to choose a set of reasonable machining methods for each surface with quality requirements.Consider the following:n（1）First of all,according to the technical requirements of each machined surface,determine the processing method and several times of processing.n（2）It is necessary to select the corresponding processing method that can obtain economic precision and economic roughness.When processing,do not blindly adopt the processing method of high processing accuracy and small surface roughness,so as to avoid increasing production cost and wasting equipment resources.n（3）Properties of workpiece materials For example,grinding is used to finish the hardened steel parts；The finishing of non-ferrous metal parts shall be carried out by means of fine turning or fine boring instead of grinding.Consider the following:n（4）Structure and size of workpiece For example,reaming,boring,grinding and other processing methods can be used for IT7 precision holes.However，the holes on the box are usually reamed and bored instead of being pulled or ground,and drilling,expanding and reaming are not suitable for holes with diameter greater than 60mm.Consider the following:n（5）Production typeThe selection of processing method should be suitable for the type of production.In mass production,the processing method with high productivity and stable quality should be selected.For example,flat surfaces and holes are broached.Small and medium-sized batch production uses planing,milling plane and drilling,expanding and reaming.Consider the following:n（6）Specific production conditionsWe should make full use of the existing equipment and technological means,constantly introduce new technology,carry out technological transformation of the old equipment,tap the potential of the enterprise and improve the technological level.n（7）Other special requirementsFor example,the requirements of surface texture,surface mechanical properties and so on.Consider the following:Processing plan and economic precision of outer circle,inner hole and plane
