葉財源

Traditional injection molding product development is a

sequential process.Geometric model of the product is constructed

by the product designer with experience, criterion or guess, but

the product designer usually has no enoughknowledge in process

development (ex:mold design) and has no genericmethod or aided-

tool, which leads to the conflicting problems between thefactors

of product design and process development. One of the

problemfrequently occurred is ejectability. The problem of

ejectability, including thewrong decisions on draw direction,

parting line and disposal of undercut, willcause the repeated

changes of design afterwards. The purpose of this thesis is

to develop a process and a method ofconcurrent ejectability

assessment for injection molding, which can efficientlyand

systematically solve the product design problems. These include

therationalization in net shape process, the calculation of

number of ejectionmechanism, the method of undercut searching,

the assessment of draw direction,parting line, and coercible

ejection. Based on the proposed method, aConcurrent Injection

Molding Ejectability Evaluation Module has beendeveloped as

computer-aided tool which is used to integrate the product

designwith process development successfully and to make product

design, moldingdesign and process design concurrent.