sprue bushing

sprue bushing

[′sprü ‚bu̇sh·iŋ]
(engineering)
A steel insert in an injection mold which contains the sprue hole and has a seat for the injection cylinder nozzle.
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Its function is to act as a thermal barrier between the hot nozzle and the relatively cool sprue bushing.
In addition, the sprue bushing inherits dimensional information from the cavity layout.
This solidification is a result of heat being sucked out of the nozzle tip due to surface contact with the cold sprue bushing.
When switching from one injection unit to the other, the carriage is unlocked and manually moved to the side, aligning the desired injection unit with the sprue bushing.
For example, in the back of a zinc die casting die is a bushing called the sprue bushing with a female radius on it.
It is typically located directly opposite the shank end of the sprue bushing and its purpose is, as the name implies, to pull the molded sprue out of its bushing.
The assembly permits perfect radius alignment between the sprue bushing and nozzle tip while compensating for misalignment up to .
This month we will focus on identifying and dealing with sprue bushing issues out on the production floor.
In addition, there can be a problem in cold runners, where you want the tip at melt temperature but it conducts heat to the sprue bushing of a cold mold, so plastic freezes in the nozzle-tip orifice.