Spark is an injection mold slide manufacturer in China. Today I want to tell you some design standards of them.
1) All shut-off surfaces must have a minimum of three degrees draft in direction of slide travel. Any shut-off angle less than three degrees must have written customer approval.
2) Two angle pins will be required on any slide design that exceeds seven inches in length. Consider a center Slide Guide for all long slides.
3) There must be a minimum of three degrees difference between the angle pin and back wedge.
4) The back wedge surface of the slide must have a lamina bronze (preferred) or 0-1 steel wear plate to allow for adjustment and for maintenance of wear surfaces.
5) The back wedge must be designed to resist injection pressure by backing up the entire molding surface. An injection mold slide design must be considered for all large molding surfaces.
6) There must be a minimum of 0.20” ( 0.37” preferred ) clearance between slide detail and the molded part when slide is in the back position.
7) There can be no ejection under the slide detail without written Customer approval. If the customer accepts ejection under the slide detail, limit switches must register both forward and back movement of the ejector system.
8) Slides that mold large areas of part shape must have sufficient cooling. Consider Mold Max sub-inserts for difficult to cool details.
9) All deep rib details must be sub-inserted for venting.
10) Consider spring-loaded slide face injection for all long wall or deep rib details.
11) Superior slide locks of sufficient weight retention can be used for slide retention in the back position.
12) Slides with flat faces that engage the cavity in direction of slide travel must be designed with face-loaded or external springs to prevent gaulding. In designs with slides on the “TOP” of mold, slide-face-mounted or external spring designs are to be used instead of Superior slide locks.
13) There must be a minimum of 6-points hardness (RcC) between the Gib material and the slide material.
14) The length of the injection mold slide foot must be 50% of the overall height of the slide.