1. Shape Modeling by Form Features
Óbuda University
John von Neumann Faculty of Informatics
Institute of Applied Mathematics
Master in Mechatronics
Course CAD Systems
Laboratory No. 3
Shape Modeling by Form Features
László Horváth

2. László Horváth UÓ-JNFI-IAM http://users.nik.uni-obuda.hu/lhorvath/
This presentation is intellectual property. It is available only for students in my courses.
The screen shots in tis presentation was made in the CATIA V5 és V6 PLM systems the Laboratory of Intelligent Engineering systems, in real modeling process.
The CATIA V5 és V6 PLM systems operate in the above laboratory by the help of Dassult Systémes Inc. and CAD-Terv Ltd.
László Horváth UÓ-JNFI-IAM

3. Program of the course
1. Systems for lifecycle management of product information
2. Functionality of engineering modeling systems. Objects in model space. Structure of engineering configuration
3. Shape Modeling by Form Features
4. Shape centric representation. Unified representation of geometry (NURBS) and topology.
5. Definition features for printed circuit board (PCB)
6. Analysis on the principle of finite elements (FEM/FEA)
7. Representation of mechanical systems
8. Representation of intents, experiences, and knowledge
9. Connections of virtual space with the physical world
10. Collaboration of engineers in PLM system
11. Representation of engineering configuration in RFLP structure
12. Management of models in PLM systems
13. Model data exchange between different models. ISO
László Horváth UÓ-JNFI-IAM

4. László Horváth UÓ-JNFI-IAM http://users.nik.uni-obuda.hu/lhorvath/
Tartalom
Contents
Important initial notices
Form features and their groups for solid model
Parameters of form features and their relationships
Generation of dress-up features for conditioning
Model definition for solid body using sequence of shape modification form features - Exercise CS 4.1
László Horváth UÓ-JNFI-IAM

5. Important initial notices
Generic model is defined which is capable for self modification along contextual chains in the context of outside control parameters.
During model definition, seeing and thinking in information structure is inevitable.
Shape modeling is only one of the examples for the application of the feature principle. Current advanced modeling applies this principle at representation of all of the engineering objects
We solve laboratory task in contextual industrial modeling system using a very restricted choice of functions. Do not use unnecessary modeling function because modeling system handles it a context.
László Horváth UÓ-JNFI-IAM

6. Form feature
Application feature: Guide
Attributes:
width
length
height
surface roughness, etc.
Form feature: Protrusion
Representation of form feature: Solid body boundary representation
KEMR – kill edge make ring (closed chain of edges)!
Definition of tabulated solid form feature on place
Opening of face and placing new closed chain of edges.
The modified shape
Euler operator
László Horváth UÓ-JNFI-IAM

7. Groups of form features for solid model
1. Defined by shape, volume adding and subtracting
Cube, cylinder, sphere, cone and torus.
2. Sketch-Based Features, volume adding and subtracting
Tabulated (extruded), rotational, pyramid, tube, swept, multi-sections, and rib.
3. Boolean operations: add, remove, and intersect bodies
Joining two bodies into a single new body,
4. Surface based features.
Individually created surface modifies solid shape.
5. Dress-up features for conditioning
Fillet, chamfer, draft, shell, thread, and tap.
László Horváth UÓ-JNFI-IAM

8. Generation of dress-up features for conditioning
Fillet results new surface(s). Arch section is constraint
Generation of solid shell after removing topological face(s) between boundary and its ofset(s).
Fixed Radius
Variable Radius
Coordinated Radius
Definition of neutral edge for draft form feature E n1 p p E n F E n d F d pl E n2
László Horváth UÓ-JNFI-IAM

9. Form features – Exercise CS 3.1
Model definition for solid body using sequence of shape modification form features
László Horváth UÓ-JNFI-IAM

10. Form features – Exercise CS 3.1
What can be seen in this viewport snapshot?
László Horváth UÓ-JNFI-IAM

11. Form features – Exercise CS 3.1
Thematic elements of exercise
Parameters of form features and their relationships
Definition of surface by moving a generator curve along path curve under the control of spine curve
Transferring shape of a surface into boundary
Definition of surface by curves defined in the boundary
Solid form feature in contextual pattern
Variable radius cubic fillet surface
Face in boundary topology as reference
Volume subtracting form feature
Mirroring of boundary represented solid body
László Horváth UÓ-JNFI-IAM

12. CS00Sxxxx00 Form features – Exercise CS 3.1
Model name in the PLM model base (for propagation):
CS00Sxxxx00
Course name
Year 16
SemesterS or F
Student name
Exercise No.:31
László Horváth UÓ-JNFI-IAM

13. Form features – Exercise CS 3.1
Parameters of form features and their relationships
László Horváth UÓ-JNFI-IAM

14. Form features – Exercise CS 3.1
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15. Form features – Exercise CS 3.1
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16. Form features – Exercise CS 3.1
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17. Form features – Exercise CS 3.1
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18. Form features – Exercise CS 3.1
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19. Form features – Exercise CS 3.1
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20. Form features – Exercise CS 3.1
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21. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

22. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

23. Form features – Exercise CS 3.1
Definition of surface by moving a generator curve along path curve under the control of spine curve
László Horváth UÓ-JNFI-IAM

24. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

25. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

26. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

27. Form features – Exercise CS 3.1
Transferring shape of a surface into boundary
László Horváth UÓ-JNFI-IAM

28. Form features – Exercise CS 3.1
Definition of surface by curves defined in the boundary
László Horváth UÓ-JNFI-IAM

29. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

30. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

31. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

32. Form features – Exercise CS 3.1
Solid form feature in contextual pattern
László Horváth UÓ-JNFI-IAM

33. Form features – Exercise CS 3.1
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34. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

35. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

36. Form features – Exercise CS 3.1
Variable radius cubic fillet surface
László Horváth UÓ-JNFI-IAM

37. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

38. Form features – Exercise CS 3.1
Face in boundary topology as reference
László Horváth UÓ-JNFI-IAM

39. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

40. Form features – Exercise CS 3.1
Volume subtracting form feature
László Horváth UÓ-JNFI-IAM

41. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

42. Form features – Exercise CS 3.1
Mirroring of boundary represented solid body
László Horváth UÓ-JNFI-IAM

43. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM

44. Form features – Exercise CS 3.1
László Horváth UÓ-JNFI-IAM