Patent · US Expired

Method of blowing cores etc. using quick-set sand, and improved mold-blowing apparatus

US4643240A · kind A · utility

2Cited by
4References
12Claims
0Family size

Assignee

Inventor

Key dates

Filing dateOct 30, 1985
Grant dateFeb 17, 1987
Priority date—
Expiry dateOct 30, 2005

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB22C15/245
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

As in the parent application, a freshly mixed quick-setting sand mix is blown from a blow box into a mold while a plunger moves through the blow box to chase all of the fluidized sand into the mold. Here, the blow box sand cavity is formed by a tube extending downward but leaving an annular gap above the blow plate. The fluidizing air tends to move bottom sand directly through the center exit in the blow plate. With quick setting sand, any residue is blown into a purge pan while the plunger is advanced. With sand that is not quick setting, and without the plunger, nearly all residual sand settles and tends to be the first blown into the mold during the succeeding blow.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.