模具设计与制造专业外文翻译--注射成型应用.doc

外文原文
Injection Molding Applications

1 .Introduction
The use of plastic tooling in injection molding occurs within the field of Rapid Tooling (RT), which provides processes that are capable of producing injection mold tooling for low volume manufacturing at reduced costs and lead times. Such tooling allows the injection molding of parts in the end-use materials for functional prototype evaluation, short series production, and the validation of designs prior to hard mitment. The term Rapid Tooling is somewhat ambiguous – its name suggests a tooling method that is simply produced quickly. However, the term is generically associated with a tooling method that in some form involves rapid prototyping and application of Stereo lithography (SL) to produce mold cavities for plastic injection molding primarily began in the 1990s. Initially the process was promoted as a quick route to soft tooling for injection molding (a tool to produce a relative low number of parts). The advantages of this have been somewhat diluted as other mold production technologies, such as high speed machining, have progressed,but other unique capabilities of the process have also been lithography has several process capabilities that are particularly advantageous for injection mold tooling, but we should also appreciate that is panied by some significant restrictions. This chapter introduces several aspects of the process panied by a discussion of its pros and cons, along with examples of work by different parties (Fig. 1).

Fig. 1 Injection molding insert generated by stereo lithography, shown with part
Keywords:Injection Molding; mold production; 3D systems; ejection forces
1. The epoxy monly cured by exposure to an elevated temperature.
Prior to use in injection molding, the epoxy mold halves (inserts) need to be contained within a bolster (an encapsulating metal mold frame) for both alignment and load mold halves may requi