This invention relates to a method of making a sand mould (1) for casting at least one piston ring blank.

By using the sand mold, aluminum is cast.

The vacuum flashes off the moisture within the sand mold mixture thereby drying the sand mold mixture to create a solidified sand mold.

A sand moulding device includes a mould cavity for receiving wet sand.

In the shakeout of the sand casting mold (2) at the mold shakeout section (5), the shakeout of the sand casting mold (2) is carried out in the state of having the cast (27) supported by means of cast supporting element (52).

Exterior of the entire sand mold is fastened and prestressed, and the assembly of the sand mold is finished.

The foamed sand (S) is packed in a cavity of a metallic mold and solidified to form a sand mold.

A method of drying a sand mold mixture containing moisture includes restraining the sand mold mixture and exposing the sand mold mixture to a vacuum.

Place a portion of the sand loosely in the mold by filling it to the point of overflow, then heap additional sand above the top of the mold.

The restraining member (302) prevents voids from forming in the sand mold during exposure to the vacuum.

Water glass sand mould, VRH method water glass sand mold, organic ester water glass self hard sand mold, clay dry type, resin self hard sand mold and cement sand type can be applied.

In the sand mold manufacturing step, the evaporative pattern is covered by sand and a sand mold is fabricated without the assembled evaporative pattern being moved from the work plane.

The mold is provided with at least two parts, namely, an upper mold and a lower mold disposed opposing the upper mold.

Said negative moulds are assembled into complete sand moulds which are used as casting moulds (lost moulds).

A part is cast from the mold and the sand core.