- Stress relieving done, as required
- Screw flight sides are ground
- Damage requiring weld repair is milled at this time.
- Rough polishing begins.
- Stress relieving done as required.
- Through in-process visual inspection, aided as necessary, by dye
penetrants or magna flux testing, is preformed.
- Extruder screws are checked for cooling hole blockages and are hydrostatically
tested. All damaged threads are corrected
- Injection screws have registers ground concentric with root diameter
and screw ends are faced off. Extruder screws with removable rips have
connecting ends ground for good tight fir.
- Finish polishing.
- Extensive dimensional and surface inspection is done.
- Plating or root treatments are applied, as required.
- Antiseize compound is applied to tip threads.
- A final check for straightness is preformed
- Finish grinds the O.D and seal area.
- Buff finishes the root diameter.
- Stamp identification number into part.
- Complex final inspection is preformed.
- Rust inhibitor is sprayed onto screw.
- Screws are wrapped in oiled paper. The unit is crated and shipped.
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