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Sprue puller pin—The sprue puller pin pulls the sprue from the sprue bush. It is usually made of CHMCS; Core back plate—It holds the core insert in place and acts as a "stiffener". It is usually made of mild steel. Guide pillar and guide bushing — The guide pillar and guide bush align the fixed and moving halves of a mold in each cycle.
The sprue is a large-diameter channel through which plastic flows, usually around the edges of the part or along straight lines. The runner is a smaller channel from the sprue to the individual part. An analogy may be found in a water system that employs a water main (sprue) and smaller pipes (runners) to individual houses.
A bronze casting showing the sprue and risers. A riser, also known as a feeder, [1] is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.
(A) Sprue, (B)&(C)runner and (D)gates in actual injection moulding product for toys The amount of resin required to fill the sprue, runner and cavities of a mould comprises a "shot". Trapped air in the mould can escape through air vents that are ground into the parting line of the mould, or around ejector pins and slides that are slightly ...
Clean nozzle and sprue bushing by making few shots; Continue purging until most of the commercial purging material is out of the hopper; Feed at least one injection capacity of the next production resin to rinse out any residuals; Start the next production with new resin
Directional solidification is the preferred technique for casting high temperature nickel-based superalloys that are used in turbine engines of aircraft. Some microstructural problems such as coarse dendritic structure, long dendrite side branches, and porosity hinder the full potential of single crystal ni-based alloys. [6]
Sprue: The pouring cup attaches to the sprue, which is the vertical part of the gating system. The other end of the sprue attaches to the runners. Runners: The horizontal portion of the gating system that connects the sprues to the gates. Gates: The controlled entrances from the runners into the mold cavities.
Bushing (bearing), a type of plain bearing; Bushing (electrical), an insulated device that allows a conductor to pass through a grounded conducting barrier; Bushing (isolator), a mechanical device used to reduce vibrational energy transfer between two parts; Drill bushing, a tool used to guide the placement of a hole when drilling in a workpiece