Download - BHEL Bhopal

DOCUMENT NO. KVE/CAD/0513/001
ANNEXURE-II
3D MODELING QUALITY ACCEPTANCE CRITERIA
The CAD modeling has been classified into two types depending on the type of features used as
below:
• Simple 3D Model -Models which can be created using regular features starting
with constrained sketches.
• Complex 3D Model - Models containing free-form surfaces which cannot be
created using sketch-based modeling.
The basic features that make a 3D CAD model simple or complex have been listed in table-1
below.
Sr. No
Features for simple modeling
Features for complex modeling
1 Extrude Advanced Free form Surfacing tools.
2 Revolve Requires Spline data as input
3
Variable Section Sweep (if sections
can be created from constrained
sketches)
CAD Acceptance Criteria/ CAD Standards
Variable Section Sweep (if sections can’t
be created from sketches)
Variable Filleting
Vendors to note the following criteria, that would be used by BHEL for accepting the quality of 3D
models.
a. Acceptance criteria for simple 3D CAD model
Sr.
Guidelines for 3D CAD models
No.
1 Accommodation of all possible ranges/variants/ratings.
2 No relations in expressions.
3 No assembly rules (Unless further Machining after assembly is required).
4 Necessary feature groups at different levels with proper names.
5 Actual manufacturing process steps followed.
6 Feature Independence-Model all the features independently in a model.
7 Fully and intelligently constrained sketches.
8 Fully constrained components in assembly.
Yes/
No
Page 14 of 22