《机械制造技术英文PPT (10).ppt》由会员分享，可在线阅读，更多相关《机械制造技术英文PPT (10).ppt（6页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、Machanical Manufacturing TechnologySpecial Machine Tool Fixture Design There are a number of issues that need to be addressed in the design of a dedicated fixture,in addition to the positioning and clamping of the workpiece.such as design steps for special fixtures、The specific design、The dimensiona
2、l tolerances and technical details of the clamp are indicated on the general drawing、Precision analysis of workpieces machined in jigs、Economic analysis of fixtures and computer-aided design of machine tool fixtures,etc.u1、Basic requirements and design steps for specialized fixtures（1）Basic requirem
3、ents for specialized fixtures1）To ensure machining accuracy of the workpiece；2）Improving productivity；3）Good workmanship；4）Good usability；5）economical.（2）Design steps for specialized fixtures1）Defining design tasks and collecting design information；2）Preparation of the fixture structure scheme and s
4、ketching of the fixture;3）Performing the necessary analytical calculations;4）Reviewing programmes and improving design;5）Draw a general diagram of the fixture assembly;6）Drawing of fixture parts.u2、The clamp is marked with dimensions,tolerances and technical requirements on the general drawing.（1）Di
5、mensions and tolerances to be indicated on the master plan of the fixture.（2)Technical requirements to be indicated on the master plan of the fixture.1）Maximum contour size（SL)2）Dimensions and tolerances that affect positioning accuracy（SD)3）Dimensions and tolerances that affect the accuracy of the
6、tool（ST）4）Dimensions and tolerances that affect the accuracy of the fixture installation on the machine（SA）5）Dimensions and tolerances that affect fixture accuracy（SJ）6）Other important dimensions and tolerances Issues that cannot be marked with symbols on the master diagram of the fixture but must b
7、e described can be written on the master diagram as a technical requirement（3）Determination of the tolerance value on the master plan of the fixture The principle for marking tolerance values on the clamp master plan is:The manufacturing accuracy of the fixture should be minimized as long as the wor
8、kpiece machining requirements are met.1）Fixture tolerances that directly affect the machining accuracy of the workpieceJwhere K and J are the corresponding dimensional or positional tolerances of the workpiece.2）Tolerances and fits for other important dimensions on the fixtureThe tolerance and fit of these dimensions have an indirect effect on the machining accuracy of the workpiece.Thanks for watching