Injection molding Injection molding is similar to casting in that it also has the concepts of Cavity Runner Sprue Parting line Making a cavity for injecting.

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Presentation transcript:

Injection molding Injection molding is similar to casting in that it also has the concepts of Cavity Runner Sprue Parting line Making a cavity for injecting the melt = Making a cavity for casting Video to overview polymer melt injection molding https://www.youtube.com/watch?v=xn2HgMjbKf4&t=42s

https://www.youtube.com/watch?v=RMjtmsr3CqA Video for general introduction to injection molding that covers both cold runner and hot runner Hot runner: sprue with runner is not a part of the mold; instead, it is a separate system

Shaping Processes For Plastics – Injection molding

The mold system (cold runner) The key is to make mold which has cavity and the product can be got out from the mold afterwards. The complexity of cavity determines the complexity of molding. https://www.youtube.com/watch?v=YekZD1zcOoA 3-plate mold https://www.youtube.com/watch?v=bAYhGI2oA7s 2-plate mold Functional analysis: FR1: to form a closed cavity. FR2: to pour the melt into the cavity. FR3: to get the molded part out of the cavity. Constraint analysis: CR1: uniformity CR2: full fill CR3: molten status

Design of the mold system (cold runner) Two plates: <DP1, DP2, DP3, DP4>: first design option Design of the mold system (cold runner) DP1 (two separate plates to form a mold cavity) Functional analysis: FR1: to form a closed cavity. FR2: to pour the melt into the cavity. FR3: to get the molded part out of the cavity. Constraint analysis: CR1: uniformity CR2: full fill CR3: molten status DP2 (runner, sprue and molded part on one plate) DP3 (ejector system on the moving plate of the mold) DP4 (manual operation) DP1 (two separate plates to form a mold cavity) FR1: to form a closed cavity. FR2: to pour the melt into the cavity. FR3: to get the molded part out of the cavity. DP2’ (runner, sprue on one plate) DP3’ (ejector system on the moving plate of the mold) Three plates: <DP1, DP2’, DP3’>: second design option

DP1 (two separate plates to form a mold cavity) Design of the mold system (hot runner) DP1 (two separate plates to form a mold cavity) Functional analysis: FR1: to form a closed cavity. FR2: to pour the melt into the cavity. FR3: to get the molded part out of the cavity. Constraint analysis: CR1: uniformity CR2: full fill CR3: molten status DP2 (runner and sprue at stationary frame) DP3: Heater for the sprue and runner DP4 (ejector system on the moving plate of the mold)