The Design Theory And Methed Of Precise Injection Mold For The Drip Emitters

Drip is an advanced modern agriculture irrigation method, the design and manufacture of emitter is the core of drip technology, the key that obtains high quality and accuracy emitter is depend on precise injection mold and precise injection process. However, when we carried on the design of precise injection mold, the close contact among mold design, mold manufacture and injection process are neglected. This string design mode caused a series of problems, such as: long design period, frequent modification and the injection parts'accuracy hard to acquire a guarantee. In order to resolve this problem, this paper provides a new precise injection mold design method which is based on concurrent design.Firstly,on the foundation of analyzing the disadvantage of string design of precise injection mold, we give out a concurrent design flow. In this flow, mold design process should be regarded as a center of the whole design cycle, CAE and CAM should be taken as important tools. It can harmonize the design among part design, mold design, mold manufacture and parts produce. Because of all design links are carried on parallel, their contact are too close, which decrease the possibility of design problems appeared, economize the time and cost of modify and iterative, promote the design efficiency and accuracy.Next, we discuss the runner system and cooling system design, two key parts of mold design. We deduce the mathematics model of mutli-cavity injection mold runner system's flow balance; give out the method to solve this model. At last, a program about runner system design was developed. Introduce the conformal cooling technology, and manufacture the injection mold with conformal cooling channels via in-direct Selective Laser Sinter (SLS), offering the substantial improvement in the control of mold temperature to keep it in steady state, improvement the uniform and efficient cooling of parts and the resulting quality of parts produced, influencing both the rate of the process and the injection cycle time. We advanced the design idea and rules of conformal cooling channels. Uses the core inserts with conformal cooling channels induce the design rules for the design of cooling system for mold based on SLS technology.Lastly, we discuss the factors influence the quality of injection parts. Passed CAE imitation, we can obtain a group of process parameters for parts'product.