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EspañolIn previous news, Shine has talked about the deisgn of slider and lifter design, today I would like to talk about the deisgn standard of runner in plastic injection mold.
Surface runner and gate design standard
1. We will not specify runner or gate size/configuration without a Mold-flow analysis performed by a reputable source and close documented communication with the customer. Unless clearly documented on the mold quotation and agreed to by Aoxu Mould, the customer will specify the runner and gate size/configuration and be responsible for part production cycle times.
2. Trapezoidal runners are preferred due to ease of machining and design. Full round runners are acceptable and common, and are necessary with some material types. All runner intersections will have radii added in the direction of flow and have cold slugs at each intersection. Refer to drawing S3-1 for cold runner guidelines.
3. Edge gate designs are to be the "double chisel" type that can easily be detached from the part. Refer to drawing S3-2 for edge gate design guidelines.
4. Fan gate are commonly used to assist in reducing part warp or to maintain flatness. Refer to drawing S3-3 for fan gate design guidelines.
5. Sub-gate designs vary, and should be addressed on an individual basis. Refer to drawing S3-4 for sub-gate deisgn guidelines.
6. Tunnel ("Cashew") gates can only be used with specific material types. Refer to drawing S3-5 for tunnel gate design guidelines.
7. Runner shut-off inserts will be the DME "MRS" type is not useable, refer to drawing S3-6 for an altenative custom deisgn.
Posted by Shine
