As is well known [1][2][3][4], the isostatic method of pressing is one of the prospective methods in the production of refractories. The authors*of the present article developed a mold for making crucibles 150 mm high and 220 mm in diameter by the isostatic method using a "free matrix" scheme. The mold is shown in Fig. 1. It consists of a rigid matrix-ring 1, fitted on a thread in a flange 2 placed on the columns 3, and spring loaded on the axle of the press mold with springs 4. The external rigid-plunger 5 is connected with the upper plate 6. The internal elastically deformable plunger (press buffer) 7 made of polyurethane is fitted to the rigid cylindrical table-pusher 8 connected by means of a shaft 9 and an ejector 10 with the press ejector 11. The annular ejector 12 is installed concentrically on the table-pusher 8 on a cross piece 13, connected with a locking device 14. Two electromechanical vibrators 15 of the type PV-66 are fitted to the flange 2, and the intermediate plate 16 --to the bottom plate 17. The regulating supports 18 are placed on the upper plate 6.
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