Instead of the traditional method of injecting from the top of the mold that is used in most vertical and horizontal machines, the manufacturing engineers opted to inject into the centerline, or parting line
, of the mold.
The tips can be removed from the parting line
without having to split the cavity block, a design said to allow for ample cooling and safer plastic sealing.
The designer also must be aware of the interdependence of the parting line
location, the undercuts and the draft angles.
Mold design will be explored, including the design process and information gathering; parting line
considerations; overflow considerations; part feeding (sprues, ring feed, pin feed, tab feed and submarine gate); cavity spacing; mold construction (mold plates, core pin/inserts, leader pins/bushings, materials selection, durability and spring assists); compression molds; transfer molds; injection molds; injection-transfer; and miscellaneous topics such as CAD, in-mold design and cold runner blocks.
Such venting can be accomplished in several ways, including stem vents (body vents), parting line
vents and stack vents (Fig.
Location of the parting line
is one of the first steps in designing an injection mold for silicone rubber.
to use and to produce a new stack-mold concept that can lower part costs and add flexibility by operating each parting line
separately and alternately.
Lansing, Michigan, has introduced the Barinder grinder--technology that utilizes robotic part handling and automated grinding wheels to remove gates, burrs and parting line
fins on gray and ductile iron castings.
Everyone knows that the parting line
and flash base configuration determine the overall deflashing quality.
The robot can remove material from a casting, such as flash on the parting line
Vertical clamping machines are supplied in standard sizes from 110 tons to 4,000 tons and are available in either top inject or parting line
To top it off, the effect is now adjustable from the parting line
of the mold (p.