In the paper examined was the influence of the cutting regime parameters on surface roughness par... more In the paper examined was the influence of the cutting regime parameters on surface roughness parameters during turning of hard steel with cubic boron nitrite cutting insert. In this study for modeling of surface finish parameters was used central compositional design of experiment and artificial neural network. The values of surface roughness parameters Ra and Rt were predicted by this two-modeling methodology and determined models were then compared. The results showed that the proposed systems can significantly increase the accuracy of the product profile when compared to the conventional approaches. The results indicate that the design of experiments with central composition plan modeling technique and artificial neural network can be effectively used for the prediction of the surface roughness for hard steel and determined significand cutting regime parameters.
Na uzorcima korozijski postojanih celika, provedena su laboratorijska ispitivanja te ispitivanja ... more Na uzorcima korozijski postojanih celika, provedena su laboratorijska ispitivanja te ispitivanja uzoraka u stvarnim uvjetima trosenja. Elektrokemijska ispitivanja provedena su u cilju provjere korozijske otpornosti modificiranih povrsina celika. Na uzorcima korozijski postojanih celika X20Cr13 i X17CrNi16-2, provedena je metalografska analiza i ispitivanje tvrdoce. Mogucnost primjene modificiranih povrsina na odabranim celicima, provjerena je ispitivanjem uzoraka u stvarnim uvjetima trosenja. Dobiveni rezultati pokazuju da su indukcijski zakaljeni i naknadno nitrirani martenzitni celici prosjecno postigli otpornost trosenju do tri reda velicine vecu u odnosu na dostavno stanje.
The paper presents a numerical analysis, using the finite element method, for the case of static ... more The paper presents a numerical analysis, using the finite element method, for the case of static and dynamic loading of the upper carriage of the remote-controlled combat station, due to the recoil force generated by the operation of the integrated automatic grenade launcher 30mm M93. The paper describes the problem of integrating the BGA 30mm M93 automatic grenade launcher onto the combat platform, and based on the dimensions of the automatic launcher, modeling of the automatic launcher stand with cradle was carried out. As a result of the weapon dynamics equations and internal ballistics calculations, the pressure force of the gunpowder gases and the recoil force of the automatic grenade launcher were calculated. The paper also presents the results of the dynamic analysis of the finite element model of the upper gun carriage loaded with the obtained impulse recoil force for different elevation angles of the weapon.
In the paper examined was the influence of the cutting regime parameters on surface roughness par... more In the paper examined was the influence of the cutting regime parameters on surface roughness parameters during turning of hard steel with cubic boron nitrite cutting insert. In this study for modeling of surface finish parameters was used central compositional design of experiment and artificial neural network. The values of surface roughness parameters Ra and Rt were predicted by this two-modeling methodology and determined models were then compared. The results showed that the proposed systems can significantly increase the accuracy of the product profile when compared to the conventional approaches. The results indicate that the design of experiments with central composition plan modeling technique and artificial neural network can be effectively used for the prediction of the surface roughness for hard steel and determined significand cutting regime parameters.
Na uzorcima korozijski postojanih celika, provedena su laboratorijska ispitivanja te ispitivanja ... more Na uzorcima korozijski postojanih celika, provedena su laboratorijska ispitivanja te ispitivanja uzoraka u stvarnim uvjetima trosenja. Elektrokemijska ispitivanja provedena su u cilju provjere korozijske otpornosti modificiranih povrsina celika. Na uzorcima korozijski postojanih celika X20Cr13 i X17CrNi16-2, provedena je metalografska analiza i ispitivanje tvrdoce. Mogucnost primjene modificiranih povrsina na odabranim celicima, provjerena je ispitivanjem uzoraka u stvarnim uvjetima trosenja. Dobiveni rezultati pokazuju da su indukcijski zakaljeni i naknadno nitrirani martenzitni celici prosjecno postigli otpornost trosenju do tri reda velicine vecu u odnosu na dostavno stanje.
The paper presents a numerical analysis, using the finite element method, for the case of static ... more The paper presents a numerical analysis, using the finite element method, for the case of static and dynamic loading of the upper carriage of the remote-controlled combat station, due to the recoil force generated by the operation of the integrated automatic grenade launcher 30mm M93. The paper describes the problem of integrating the BGA 30mm M93 automatic grenade launcher onto the combat platform, and based on the dimensions of the automatic launcher, modeling of the automatic launcher stand with cradle was carried out. As a result of the weapon dynamics equations and internal ballistics calculations, the pressure force of the gunpowder gases and the recoil force of the automatic grenade launcher were calculated. The paper also presents the results of the dynamic analysis of the finite element model of the upper gun carriage loaded with the obtained impulse recoil force for different elevation angles of the weapon.
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