Abstract: The demolding mechanism with a mode of push rod plus inclined top plus push block plus cylinder ejection was adopted to solve the demolding difficulty in large plastic parts. A lateral core-pulling mechanism with an indirect core-pulling cylinder was adopted for the die, which greatly reduced the maximum shape size of the die and solved the core-pulling difficulty in tunnels. The problem that the instrument panel storage bins of automobile were easy to stick to the die were successfully solved by designing reinforcing ribs and inverted ribs on the moving die side. The dimensional accuracy of plastic parts was greatly improved by adopting the temperature control system of the crisscross “straight-through water pipe plus diaphragm well”. Moreover, the forming cycle reached 50 s, which was lower than that of the same type of instrument panel storage bins by about 10 %.

Key words: instrument panel storage bins of automobile, hot runner, large injection mold, indirect core pulling by cylinder