Simultano inženjerstvo utemeljeno na virtualnoj proizvodnji

U radu je razmatran koncept konkurentnog inženjeringa koji podrazumijeva simultane aktivnosti u integriranom razvoju proizvoda i procesa, kroz primjenu inovativnih tehnologija virtualnog inženjeringa, posebno u dijelu simulacije proizvodnje, tzv. virtualne proizvodnje. Cilj je da se minimiziraju projektne izmjene u kasnijim fazama projektiranja, a time i vrijeme i troškovi projektiranja proizvoda i pripadajućih procesa. Primjena FE/FV simulacija može eliminirati skupe fizičke prototipove i eksperimente. Vrijeme razvoja se drastično smanjuje, više projektnih alternativa se može provjeriti, što rezultira povećanjem kvalitete. Primjena koncepta ilustrirana je brojnim primjerima numeričkih simulacija proizvodnih procesa korišćenjem SIMUFACT.forming softvera: oblikovanje debljih limova, kovanje, "net-shape" obrada, toplo istiskivanje profila, itd

Experimental research on machine elements of helicoidal shell shape

U radu su predstavljeni modeli za eksperimentalno i numeričko istraživanje zavojne ljuske. Tri oblika su odabrana za eksperiment: model A predstavlja zavojnu ljusku na cilindričnoj ljuski, model B kružnu ljusku na cilindričnoj ljuski, i model C pravokutnu ljusku na cilindričnoj ljusci. Ostvarenje kontinualnog opterećenja po površini ljuske je izvršeno pomoću normalnog tlaka koga osigurava konstrukcija sa dvostrukom zavojnom ljuskom sa posebnim elementima za brtvljenje. Mjerenje naprezanja je izvršeno korištenjem mjernih traka. Usporedni rezultati su dobiveni uporabom softverskog paketa za analizu pomoću metode konačnih elemenata ANSYS Workbench. Eksperimentalna istraživanja su potvrdila da numeričko modeliranje daje mjerodavne rezultate naprezanja, deformacija i ugiba kontinualno opterećene zavojne ljuske.In this paper we present a model for the experimental and numerical study of helical shells. Three different forms were chosen for the experiment: Model A forms a helicoidal shell on a cylindrical shell, Model B is an annular shell on a cylindrical shell and Model C a rectangular plate on a cylindrical shell.. Placing a continuous load on the surface of the shell was achieved by normal pressure, thanks to special sealing elements within the construction of the double helical shell.The strain was measured using strain gauges. Comparable results were obtained using the ANSYS Workbench software package for analysis using the finite element method. The experimental investigation confirmed that the numerical modelling provides relevant results for the stress, deformation and deflections of continuously loaded helical shells

Concurrent engineering based on virtual manufacturing

U radu je razmatran koncept konkurentnog inženjeringa koji podrazumijeva simultane aktivnosti u integriranom razvoju proizvoda i procesa, kroz primjenu inovativnih tehnologija virtualnog inženjeringa, posebno u dijelu simulacije proizvodnje, tzv. virtualne proizvodnje. Cilj je da se minimiziraju projektne izmjene u kasnijim fazama projektiranja, a time i vrijeme i troškovi projektiranja proizvoda i pripadajućih procesa. Primjena FE/FV simulacija može eliminirati skupe fizičke prototipove i eksperimente. Vrijeme razvoja se drastično smanjuje, više projektnih alternativa se može provjeriti, što rezultira povećanjem kvalitete. Primjena koncepta ilustrirana je brojnim primjerima numeričkih simulacija proizvodnih procesa korišćenjem SIMUFACT.forming softvera: oblikovanje debljih limova, kovanje, "net-shape" obrada, toplo istiskivanje profila, itd.The paper deals with the concurrent engineering concept that implies simultaneous activities in integrated product and process development, through the application of Virtual Engineering Technologies, especially in the simulation of production, i.e. Virtual Manufacturing. The main goal is to minimize design modifications in final design stages, and therewith time and costs of design of product and related processes. Expensive physical prototypes and experiments can be avoided by applying numerical FE/FV simulations. Development time is drastically decreased; many design alternatives can be verified, leading to quality improvements. Application of CE concept is illustrated through numerous case studies of numerical simulations of processes using SIMUFACT.forming software: thick sheet forming, forging, net-shape forming, hot profile extrusion, etc

ANALYSIS OF THE OF HELICOIDAL SHELL BENDING ON CYLINDRICAL SHELL

ABSTRAC

A study on friction stir welding of AlSi1MgMn aluminium alloy plates

U radu su prezentirana eksperimentalna istraživanja i numeričke simulacije procesa zavarivanja trenjem (FSW). Cilj rada je određivanje termo-mehaničkih i kinematičkih parametara procesa spajanja lima od aluminijske legure AlSi1MgMn debljine 7,8 mm. Eksperimentalna istraživanja su projektirana na temelju usvojenog višefaktornog plana (DoE), s variranjem faktora na dvije razine i ponavljanjem u središnjoj točki plana. Parametri varirani u eksperimentu su: brzina zavarivanja, kutna brzina okretanja alata, kut nagiba trna, promjer trna i promjer čela alata. Na temelju usvojenih geometrijskih parametara projektirana je i izrađena familija alata. Eksperiment je proveden u laboratorijskim uvjetima, koji su slični proizvodnom okruženju. Za numeričku simulaciju procesa FSW, korišten je programski paket DEFORM-3D. U radu je prikazana detaljna analiza i usporedba istraživanih parametara dobivenih eksperimentalnim putem i numeričkom simulacijom.Presented in this paper are an experimental investigation and numerical simulations of the Friction Stir Welding (FSW) process. The aim was to determine thermo-mechanical and kinematic parameters of the process of joining two AlSi1MgMn aluminium alloy plates with the thickness of 7,8 mm. Experimental study was designed based on the 2-level multifactorial design of experiment (DoE), with centre points. Parameters varied in the experiment were: welding speed, rotation speed, angle of pin slope, pin diameter and shoulder diameter. Based on the adopted geometric parameters, the family of tools was designed and manufactured for the experiment. The experiment was performed in laboratory conditions, which were similar to production environment. Numerical simulation of the FSW process was carried out using DEFORM-3D software. Detailed analysis of the process as well as comparison between experimental and numerical results is presented

Concurrent engineering based on virtual manufacturing

U radu je razmatran koncept konkurentnog inženjeringa koji podrazumijeva simultane aktivnosti u integriranom razvoju proizvoda i procesa, kroz primjenu inovativnih tehnologija virtualnog inženjeringa, posebno u dijelu simulacije proizvodnje, tzv. virtualne proizvodnje. Cilj je da se minimiziraju projektne izmjene u kasnijim fazama projektiranja, a time i vrijeme i troškovi projektiranja proizvoda i pripadajućih procesa. Primjena FE/FV simulacija može eliminirati skupe fizičke prototipove i eksperimente. Vrijeme razvoja se drastično smanjuje, više projektnih alternativa se može provjeriti, što rezultira povećanjem kvalitete. Primjena koncepta ilustrirana je brojnim primjerima numeričkih simulacija proizvodnih procesa korišćenjem SIMUFACT.forming softvera: oblikovanje debljih limova, kovanje, "net-shape" obrada, toplo istiskivanje profila, itd.The paper deals with the concurrent engineering concept that implies simultaneous activities in integrated product and process development, through the application of Virtual Engineering Technologies, especially in the simulation of production, i.e. Virtual Manufacturing. The main goal is to minimize design modifications in final design stages, and therewith time and costs of design of product and related processes. Expensive physical prototypes and experiments can be avoided by applying numerical FE/FV simulations. Development time is drastically decreased; many design alternatives can be verified, leading to quality improvements. Application of CE concept is illustrated through numerous case studies of numerical simulations of processes using SIMUFACT.forming software: thick sheet forming, forging, net-shape forming, hot profile extrusion, etc

Surface roughness evaluation in hardened materials by pattern recognition using network theory

Performance characteristics of the products made of metallic materials such as wear resistance, fatigue strength, stability of gaps and strain between the connections, corrosion resistance, etc., depend to a large extent by the quality of their surfaces roughness. An interactive control of the manufacturing parameters which influence the surface roughness is particularly crucial in the construction of many mechanical components. The present paper devises a new method for statistical pattern recognition on samples produced by the process of robot laser hardening using network theory and describes its application to the determination of surface roughness. The method is based on the analysis of SEM images. Indeed the data characterizing the state of surface irregularities detected as extremely small segments contain indicators of surface roughness. Different methods of machine learning techniques designed to predict the surface roughness of robot laser hardened material are discussed