Patent · US Expired

Foundry facing sand composition

US3961967A · kind A · utility

7Cited by
6References
8Claims
0Family size

Assignee

Inventor

Key dates

Filing dateApr 10, 1974
Grant dateJun 8, 1976
Priority date—
Expiry dateApr 10, 1994

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB22C1/00
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

An improved foundry facing sand is disclosed. The foundry facing sand comprises silica sand admixed therewith, in percent by weight of the silica sand, from about 0.8 to about 2 percent of a cellulose binder, from about 2 to about 6 percent of foundry clay, from about 3.5 to about 7 percent water, from about 1 to about 2.2 percent core oil, from about 0.3 to about 0.5 percent of a release agent-lubricant, and from about 0 to about 20 percent silica flour. The use of such foundry facing sand in green sand molds improves the quality and finish of finished castings and also does not detrimentally affect the permeability of system sand.

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