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The monograph is devoted to study of influence of structure adjustment of gating system of casting mould upon the quality of diecast parts. The monograph offers characterization of die casting technology, methodology of designing of mould and of its individual parts. At the same time mutual relation between the errors occurring in diecast parts and structural as well as technological mistakes witch induced these errors. Performed were the experiments with series of diecast parts made of AlSi alloy focused on analysis of influence of the diecast part moulding, of the sprue width and of the ingate height upon the qualitative properties of diecast parts. Those were represented by the selected mechanical properties - i.e. by permanent deformation and by surface hardness - by properties representing diecast part homogeneity - by porosity and percentage proportion of contractions. The measurements detected mutual relations among selected structure adjustments of the gating system and qualitative properties of diecast part and among those properties as such. The monograph is intended mainly for students, postgraduates and pedagogues at technical universities as well as to for broad scientific and expert public and technologists and foundry shop workers.