6 0。044 0。051 0。078 0。048 0。050 0。074 0。049 0。043 0。074 0。058 21。699

7 0。014 0。017 0。023 0。016 0。017 0。020 0。014 0。014 0。019 0。030 28。132

8 0。046 0。066 0。085 0。047 0。064 0。082 0。044 0。057 0。082 0。035 25。907

9 0。088 0。156 0。222 0。093 0。158 0。207 0。084 0。122 0。209 0。058 21。643

So we concluded that simulation and experiment results were basic consistent, we can change process conditions to take an optimal design。 The reason for developing the distortion was the variation of residual

Table 4 Average values at different levels

Avg。 value Melt temp。 Mold temp。

Packing press。

Packing time

stress between different sections。 In stress calculation, the calculated temperatures in packing and cooling stage were taken as external loads acting on the metal insert and polymer part。 At the beginning of packing, the thin part with higher temperature gradient began to contract immediately in solidification as shown in Fig。 11。16 In such area around

point 9, stress generated quickly  at the beginning of packing stage  as

     Level 1 0。043899 0。058525 0。040808 0。043229

     Level 2 0。042769 0。03947 0。043799 0。043113

     Level 3 0。040925 0。030599 0。043986 0。042251

  Delta 0。002973 0。027926 0。003178 0。000862