2. The method according to claim 1, wherein the mix is deposited continuously on a conveying surface in a location spaced from the forming station and is advanced as a continuous bed to the forming station; and the step of forcing the pattern into the bed severs the mould part from the bed.

3. The method according to claim 2, wherein the curable binder material is selected from the group consisting of curable polymeric binder materials and alkali metal silicate binder materials and the step of forcing a pattern into the mix is accomplished when an AFS Standard Foundry Sand Mix Text Specimen prepared therefrom will exhibit a density not differing more than 6 percent from that of a like specimen prepared at the time of mixing.

4. The method according to claim 3, wherein the binder material comprises an isocyanate resin and a hydroxyl-containing coreactant.

5. The method according to claim 4, wherein the coreactant is an oil-modified alkyd resin.

6. The method according to claim 3, wherein the binder material is present in the mix in an amount not exceeding 10 percent of the sand weight and comprises a primary polymeric binder material and a substantial proportion of a hydrocarbon polymer oil having a Staudinger molecular weight of 200-1,000, an iodine number of 240-320, and a boiling point in the range of 400*-1,000* F.

7. The method according to claim 6, wherein the primary polymeric binding material comprises an isocyanate resin and an oil-modified alkyd resin. The method according to claim 3, wherein the step of forcing a pattern into the mix is accomplished when an AFS Standard Foundry Sand Mix Test Specimen prepared therefrom will exhibit a density not differing more than 4 percent from that of a like specimen prepared at the time of mixing.

9. The method according to claim 3, wherein the curable binder material is an aqueous alkali metal silicate material having an alkali metal silicate content of at least 10 percent by weight, the silica to alkali metal oxide weight ratio being 0.5:1 - 5:1.

10. The method according to claim 9, wherein the curable binder material is an aqueous sodium silicate material containing at least 30 percent by weight sodium silicate and having an SiO2: Na2O weight ratio of at least 2:1, the amount of said binder material being equal to 2-6 percent of the weight of sand employed in the mix.

11. The method according to claim 10, wherein the mix contains a minor proportion of an acidic liquid curing catalysts for the sodium silicate binder material.

12. The method according to claim 9, wherein the mould part is thermally cured.

13. The method according to claim 9, wherein at least part of the step of curing the mould part is accomplished by gassing the same with an acidic gas.

14. The method according to claim 2, wherein the conveying surface is presented by an endless conveyor and the continuous bed is confined between surfaces spaced apart transversely of the conveyor.

15. The method according to claim 2, wherein the conveying surface is advanced stepwise to present a new portion of the continuous bed at the forming station after each mouLd part has been formed.