**5. Protocol**

The foundations of a knowledge database are knowledge acquisition and knowledge repre‐ sentation. Knowledge engineers retrieve knowledge from experts, books, or other sources, and then represent it on computer systems. The process of retrieving knowledge is called knowl‐ edge acquisition, and the process of representing knowledge on a computer system is called knowledge representation.

40

5

th operation: c

am-burring

estriking

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http://dx.doi.org/10.5772/52010

207

3

rd operation: r

42

**Figure 40.** Feature recognition result for structure parts

**Figure 41.** Drawing direction for structure parts

2nd operati

4th operation

**Figure 42.** Process planning result for structure parts

: piercing and

cam-piercing

nd piercing

on: trimming a

35 This research develops feature protocol and process protocol to record feature recognition and process planning results (Lutters et al., 2000), respectively. According to the process level, the

**Figure 40.** Feature recognition result for structure parts

of the features based on panel model and click on one or two surfaces in each group as start

The most significant problem when searching a bend surface is the direction of the connection between bend surfaces (Fig. 38). Although the curvature of surface (a) and (b) both exceed the critical value, surface (a) should be deemed a flat surface instead of a bend surface based on

First, users click on at least two adjacent surfaces in the bend group. The surface that will be judged to be in the same bend group must satisfy the following three conditions: its curvature exceeds the critical value; it contacts the selected or judged bend surface; and the connecting

Fig. 40-42 show feature recognition result, the optimized drawing direction, and process

The foundations of a knowledge database are knowledge acquisition and knowledge repre‐ sentation. Knowledge engineers retrieve knowledge from experts, books, or other sources, and then represent it on computer systems. The process of retrieving knowledge is called knowl‐ edge acquisition, and the process of representing knowledge on a computer system is called

(b)

(b) Bend surface

Bend surfac the connect angle is less t critical valu

ce : ting than ue

35

This research develops feature protocol and process protocol to record feature recognition and process planning results (Lutters et al., 2000), respectively. According to the process level, the

38

surfaces to identify automatically all surfaces with the same feature.

angle between bend surfaces is less than a critical value (Fig. 39).

(a)

(a) Flat surface

**Figure 38.** Connecting direction between bend surfaces

Flat surface the connecti angle is mo than critical v

**5. Protocol**

knowledge representation.

e : ing ore value

**Figure 39.** Connecting angle between bend surfaces

planning results for structure part, respectively.

the panel model.

206 Advances in Industrial Design Engineering

**Figure 41.** Drawing direction for structure parts

**Figure 42.** Process planning result for structure parts

information is split by characters "! ; : <>,". Each operation should contain an ID, type, stroke, die center, die dimensions, shoe height, and arranged tasks (Fig. 43). Notably, each task type has its own information that must be recorded (Fig. 44).

like to thank the National Science Council of the Republic of China, Taiwan, for financially

Design for Automotive Panels Supported by an Expert System

http://dx.doi.org/10.5772/52010

209

supporting this research under Contract No. NSC-98-2221-E-002-135-MY2.

Department of Mechanical Engineering, National Taiwan University, Taiwan, ROC

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**Author details**

**References**

No.1, pp. 89-101

239-245

485-497

173, Issue 2, pp. 213-222

4, pp. 261-268

of Chicago Press, Chicago

Verlag London Limited, ISBN 1846284759

*Processing Technology*, Issue 1, pp. 120-127

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**Figure 44.** Protocol of each task
