Thixotropic injector with improved annular trap

Patent metadata

Field	Value
Publication number	US-8978735-B2
Application number	US-201313739578-A
Country	US
Kind code	B2
Filing date	Jan 11, 2013
Priority date	Jan 29, 2010
Publication date	Mar 17, 2015
Grant date	Mar 17, 2015

Abstract

By blocking an angular extent of an annular skimming trap used for semi-solid injection, a notable reduction in lenticular defects and porosity are observed. The blocking can be performed by a ring having dimensions to completely occlude a prior art annular skimming trap throughout the angular extent, and providing complete and/or partial flow across the ring throughout the rest of the angular extent. Preferably an outlet to the ring trap includes a chamfered edge and/or a deflector for encouraging flow of the contaminated semi-solid material into the trap.

First claim

What is claimed is:

1. An injector for injecting a thixotropic billet from a piston chamber into a mold, the injector comprising:
a piston chamber segment having a peripheral wall surrounding a center axis to define a piston chamber, the piston chamber terminated by an end wall;
an entry channel in fluid communication with, and having a smaller diameter than, the piston chamber, the entry channel extending through the end wall; and,
near the peripheral wall proximate the end w…

Assignees

• Nat Res Council Canada

Inventors

• Zheng Chang-Qing
• Drolet Dany

Classifications

• B22D35/04

  Operations & Transport · mapped topic

• B22D17/007

  Operations & Transport · mapped topic

• B22D17/203 Primary

  Operations & Transport · mapped topic

• B22D43/00

  Operations & Transport · mapped topic