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Influence of Automatic Core Shooting Parameters in Hot-Box Technology on the Strength of Sodium Silicate Olivine Moulding Sands

Stachowicz M.

Archives of Foundry Engineering

2020

Vol. 20, iss. 1

67--72

The paper presents the results of preliminary research on the application of olivine moulding sands with hydrated sodium silicate containing 1.5 % wt. of binder to perform ecological casting cores in hot-box technology using a semi-automatic core shooter. The following parameters were used in the process of core shooting: initial shot pressure of 6 bar, shot time 3 s, the temperature of the core-box: 200, 250 and 300°C and the core curing time: 30, 60, 90, 120 and 150 s. The matrix of the moulding mixture was olivine sand, and the binder of the sandmix was commercial, unmodified hydrated sodium silicate with molar module SiO2/Na2O of 2.5. In one shot of the automatic core-shooter were formed three longitudinal specimens (cores) with a dimensions 22.2×22.2×180 mm. The samples obtained in this way were subjected to the assessment of the influence of the shooting parameters, i.e. shooting time, temperature and curing time in core-box, using the following criteria: core box fill rate, mechanical strength to bending RgU, apparent density, compaction degree and susceptibility to friability of sand grains after hardening. The results of trials on the use of olivine moulding sands with hydrated sodium silicate (olivine SSBS) in the process of core shooting made it possible to determine the conditions for further research on the improvement of inorganic hot-box process technology aimed at: reduction of the heating temperature and the curing time. It was found that correlation between the parameters of the shooting process and the bending strength of olivine moulding sands with sodium silicate is observed.

Nowy efektywny fonolowo-formaldehydowy proce hot-box

Gieniec A., Oosterhof K., Asłanowicz M., Domagało K.

Przegląd Odlewnictwa

1999

Vol. 49, z. 12

482-484

Po przedstawieniu charakterystyki procesu gorącej rdzennicy (hot-box) pod względem jego przydatności w seryjnej produkcji rdzeni, wskazano na nowe masy ze spoiwem KERNFIX HB 96/100, z utwardzaczem HOTFIX HB 815/6.

First the characteristic features of the hot-box process in respect of its efficiency in the series producttion of cores are presented, and next the new sands with Kernfix HB 96/200 binder and Hotfix HB 815/6 hardener are pointed to.