Mold cooling analysis

Here —k dT/dx ) is the heat flux, h is the heat transfer coefficient (Delaunay et al. 2000a), T and are the mold wall temperatures at the two opposite sides of the cavity. The mold wall temperature should be calculated from the mold cooling analysis (see Chap. 7). 

In Eq. 7.2, q is the heat flux across the melt and mold interface, which is not known beforehand. The mold cooling analysis is essentially coupled with the transient heat transfer in the polymer melt during filling, packing, and cooling stages. 

The mold cooling analysis and the flow analysis are essentially coupled since the transient cavity wall temperature and heat flux are unknown in both analysis, although in practice one may only need a couple of iterative loops, depending on the required accuracy and efficiency. 

This Chapter will discuss the flow analysis, stractural analysis and the mold cooling analysis in sequence. 

Boundary Element Method for Mold Cooling Analysis... 

Numerical results of mold cooling analysis using a similar method were also presented by Chen and Chung (1994). 

Another alternative BIE that can be applied to mold cooling analysis is to use time-dependent fundamental solutions (e.g., Qiao 2005). The boundary integral equation can be written as... 

As has been mentioned in Sect. 7.3, the continuous injection-molding operation results in a cyclic heat transfer behavior in the mold, after a short transient period. The cycle-averaged temperature can be represented by a steady state heat conduction equation, i.e., Eq. 7.10. The mold cooling analysis can be greatly simplihed by solving the steady state problem. The boundary integral equation of ( 7.10) is... 

Figure 10-23. A mold-cooling analysis diagram used in a CAD system—the Moldcool program by Moldflow Australia Pty., Ltd.

MOLD COOLING ANALYSIS FOR INJECTION MOLDING PROCESS USING FAST MULTIPOLE METHOD... 

Koo, B. H., Choi, K. 1., 2004, Three-Dimensional Mold Cooling Analysis for Injection Molding Process , ANTEC 2004... 

Key Words Three Dimensional, Mold Cooling Analysis, Fast Multipole Method, Boundary Element Method... 

In this work, a numerical solver based on Finite Volume Method (FVM) is developed to solve the governing equations. The solver has been successfully applied in injection molding filling simulation [2]. Numerical experiments confirm the reliability and efficiency of the solver. Currently the proposed solver can handle tetra, hexa, prism, pyramid, and mixing elements. Prism layer element can also be used for analysis to improve thermal boundary resolution while without extensive refining of mesh. This is valuable in mold cooling analysis that may involve millions of elements. 

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