上海交通大学：《现代机械工程图学》教学资源（实践课件）04_UG：Modeling

UG:Modeling ME 250:Design Manufacturing I School of Mechanical Engineering Shanghai Jiao Tong University 1

Shanghai Jiao Tong University 1 UG: Modeling ME 250: Design & Manufacturing I School of Mechanical Engineering

Outline Design Feature Datum Features ■Feature Operation ■ Summary Shanghai Jiao Tong University 2

Shanghai Jiao Tong University 2 Outline n Design Feature n Datum Features n Feature Operation n Summary

Design Feature Design Feature is the detail feature that automatically unite or subtract from a solid body.Because they use relative positioning,they provide greater flexibility than primitives. Shanghai Jiao Tong University 3

Shanghai Jiao Tong University 3 Design Feature n Design Feature is the detail feature that automatically unite or subtract from a solid body. Because they use relative positioning, they provide greater flexibility than primitives

Planer Placement Face All design features,with exception of groove,require a planar placement face. -The planar placement face is a flat surface on which to place the design feature. Shanghai Jiao Tong University 4

Shanghai Jiao Tong University 4 Planer Placement Face n All design features, with exception of groove, require a planar placement face. n The planar placement face is a flat surface on which to place the design feature

Horizontal Reference The horizontal reference defines the XC or length direction for a non-cylindrical feature Unigraphics requires horizontal and vertical directions which are independent of the WCS, on the planar placement face. A horizontal reference can be any solid edge, endpoint,datum axis or datum plane that defines a vector parallel to the planar placement face. Shanghai Jiao Tong University 5

Shanghai Jiao Tong University 5 Horizontal Reference n The horizontal reference defines the XC or length direction for a non-cylindrical feature . n Unigraphics requires horizontal and vertical directions which are independent of the WCS, on the planar placement face. n A horizontal reference can be any solid edge, endpoint, datum axis or datum plane that defines a vector parallel to the planar placement face

Horizontal Reference Placement Face Shanghai Jiao Tong University 6

Shanghai Jiao Tong University 6 Placement Face Horizontal Reference

Relative Positioning Relative positioning Circular tool feature Positioning is the distance relationship of a 1护 Current Expression feature with respect mm to an existing solid OK Apply Back Cancel edge,curve or datum plane. Rectangular tool feature Positioning 1 护护王A 工 Reverse Nommal Shanghai Jiao Tong University OK Back Cancel

Shanghai Jiao Tong University 7 Relative Positioning n Relative positioning is the distance relationship of a feature with respect to an existing solid edge, curve or datum plane. Circular tool feature Rectangular tool feature

Design Features 1.Consider selectable objects to position to Body edges,Reference Feature,etc.Create them first if necessary). 2.Select type of Form Feature. 3.Select Placement Face 4.Select through Faces for Holes or Slots,if necessary, Datum planes can be used. 5.Select Horizontal or Vertical reference direction 6.Enter sizes and/or angles 7.(Optional)Locate the feature relative to its parent body using Positioning Dimensions. Shanghai Jiao Tong University 8

Shanghai Jiao Tong University 8 Design Features 1.Consider selectable objects to position to ( Body edges, Reference Feature, etc. Create them first if necessary). 2.Select type of Form Feature. 3.Select Placement Face 4.Select through Faces for Holes or Slots, if necessary, Datum planes can be used. 5.Select Horizontal or Vertical reference direction 6.Enter sizes and/or angles 7.(Optional)Locate the feature relative to its parent body using Positioning Dimensions

Boss Boss ☒ Selection Steps Filter Any Diameter 29 Face Height 30Datum Plane Taper Angle 0 deg Reverse Side OK Apply Cancel Shanghai Jiao Tong University 9

Shanghai Jiao Tong University 9 Boss

Pad Rectangular Pad ☒ Horizontal Reference Name Name Pad End Polnt Rectangular Solid Face General Datum Plane Da Rectangular Pad OK Back Cancel OK Back Cancel Dat Length 70 mm Width 30 m Vertic 母 Height 10 n OK Corner Radius 2 n Taper Angle 5 deg马 OK Back Cancel Positioning ☒ 1”边至24 广王工 Reverse Normal OK Back Cancel Shanghai Jiao Tong University 10

Shanghai Jiao Tong University 10 Pad