Measurement of Molding Sand Elasticity

Abstract

The progressive mechanization and automation of industrial equipment is the driving force of progress, not only in the field of production but also in the measuring and control equipment. In mold production, the automation of processes such as forming molds and cores along with their assembly has led to increases in serial production, reductions in defects, and the shortening of molding times, among others. Thanks to automation in mold and core departments and the use of all sorts of manipulators, mold production in foundries has gained momentum. Unfortunately, in addition to the mentioned advantages, there are also new challenges as to the quality and properties of the molding and core sands used in highly automated foundries.This article presents recent research on molding sand elasticity. The topic was introduced as an attempt to answer the new needs of highly mechanized foundries. The article discusses a new method of measuring the resistance of molding materials to undergoing mechanical deformation (molding sand elasticity), with an additional analysis of the bending strengths of the tested samples. Precise measurements, test sample preparation, and interpretation of the received results are presented in the article.

The thermal and structural analysis of new bicomponent binders for moulding sands consisting of furfuryl resin and polycaprolactone (PCL)

“…450°C. This means that the loss of PCL specimen weight begins much later than in commonly used moulding sand foundry resins and is more violent [9]. The thermal destruction of two-component adhesives process is similar to the TG curve of pure furfuryl resin (Fig.…”

“…2. DTA curves of applied resins [9] The study showed that the phenol-furfuryl resin has a lower temperature of the beginning of thermal destruction (temperature approx. 120°C).…”

“…It can be concluded that the partial replacement of the petrochemical origin binder with biodegradable material will improve the quality of tested moulding sands [9][10][11]. In addition, the use of polycaprolactone as a component of the new binder can improve the resistance to deformation of the moulding sand at ambient temperature, known in the literature as flexibility/elasticity [12][13].…”

“…Polycaprolactone was used as a plasticizer in blends of: aliphatic polyesters, cellulose esters, aromatic polyesters, polycarbonates, polymers containing styrene (eg. Polystyrene), polyolefins, block copolymers, and in foundry resin type NO-VOLAK [8][9].…”

Archives of Metallurgy and Materials

“…An optimisation of the production process of cores by blowing methods contains the selection of work parameters of the core box filling and moulding sand compaction processes as well as methods of moulding sand hardening by gaseous or thermal agents. Out of the parameters deciding on the processes of the mould cavity filling and moulding sand compaction the influence of such factors as: kind of the core sand and its reclaim [1][2][3][4][5][6][7][8][9], complication of the core shape, shooting pressure value, recommended surfaces and dimensions of shooting and venting holes, should be taken into account. The mentioned subjects, concerning traditional core binders (oil or linseed varnish, water glass, some resins for the hot-box process), were previously investigated [10][11][12][13][14][15][16][17][18], while analogous investigations for core sands with the inorganic Cordis binder -introduction of which into the foundry practice holds promise of decreasing pollution of the natural environment -were not performed.…”