Page 42 - Апрель

FOUNDRY PRODUCTION

FANTASTIC CASTING OF SPATIAL FRAME-CELLULAR
STRUCTURES

First part in March 2021

One of the options for obtaining a model from elements in a reusable form is as follows.
Prefabricated polyhedrons like those shown in Fig. 2, 3, with sizes from several to tens, hundreds
of millimeters c 2 or more, with open through cavities as in Fig. 4, fall asleep or put it manually
into the shaping container 2 (Fig. 5). Preliminarily, an air-tight bag made of synthetic film 3
is placed there. After filling these repeating elements, the cavity of the bag is evacuated and
sealed with a clamp 5, thereby fixing the polyhedrons in a single model by pressing them
against each other by the difference in air pressure outside and inside the bag.

Fig. 4. Model of a tetrahedron.

Fig. 1. Cast metal tree structure. 1 - Fig. 2. 5 types of regular Bernal
barrel, 2 - branches, 3 - contours of the polyhedra (from left to right):
walls of the mold, 4 - the remainder of tetrahedron, octahedron, trigonal
the funnel prism, Archimedean antiprism,
tetragonal dodecahedron.

Fig. 5. Scheme of obtaining a
shaped model. 1 - model of repeating
elements, 2 - shaping container, 3 -
Fig. 3. Voronoi’s polyhedra (from left to right): icosahedron, polyhedron
structures, polyhedron structures. synthetic film in the form of a bag, 4 -
weight, 5 - clamp, 6 - branch pipe.

42 Stanochniy park