Knowledge Based CAPP System for Drawing

The architecture of a knowledge based CAPP system for drawing is quite similar to one discussed earlier for stamping. It essentially has the following functional modules :

• CAD modeling of parts
• Blank development
• Die Design

 (i) Planning stages in drawing

 (ii) Developing intermediate geometry

 (iii) Die Layout

 (iv) Design/Selection of punch/Dies

•  Output

 (i) Die Drawings

 (ii) BOM

• Data Base

(i) Materials

(ii) Press/Tool Specifications

(iii) Decision Rules/Tables

Figure: Knowledge Based CAPP System for Drawing 

The CAPP system is knowledge based having an Inference engine and Rule/Data base as shown in Figure. The overall working of the knowledge based CAPP system is shown in Figure. It essentially is a two stage process as under.

Figure : Working of Knowledge Based CAPP System

Stage 1

Identification of the type of cup geometry to be formed from the CAD part model.

Stage 2

Design of Die Stages.

In what follows, important functional modules of the CAPP system are discussed.