Realizou-se um estudo dos efeitos das variáveis de moagem e dos moinhos de alta energia sobre a síntese do composto intermetálico NiAl. A influência do poder de moagem, tamanho de partícula inicial de Ni, agente controlador de processo e dimensões dos corpos moedores durante a síntese do composto NiAl no moinho Spex foi quantificada utilizando-se um planejamento fatorial. Verificou-se uma significativa influência do poder de moagem no tempo de ignição da reação exotérmica de formação do composto NiAl, além da influência da interação entre o poder de moagem, agente controlador de processo e dimensões dos corpos moedores no tamanho médio de partículas dos produtos das moagens. O rendimento no moinho Attritor demonstrou-se dependente do poder de moagem e também da quantidade de agente controlador do processo durante a moagem de misturas de pós de Ni e Al. A síntese por combustão de pós mecanicamente ativados no moinho Attritor levou à formação de NiAl3, Ni2Al3 e NiAl ou somente NiAl, dependendo da temperatura de síntese. Conduziu-se a tentativa de determinação experimental, através da técnica de calorimetria diferencial de varredura, das entalpias de formação dos compostos intermetálicos NiAl3, Ni2Al3, NiAl e Ni3Al; os valores encontrados para Ni2Al3 e Ni3Al foram, respectivamente, 167 kJ/mol e 93 kJ/mol. A formação de NiAl no moinho planetário, ao contrário do verificado nos moinhos Spex e Attritor, ocorreu de maneira gradual e o tempo necessário para a formação do composto foi dependente da quantidade de agente controlador de processo. Para os moinhos planetário e Attritor estimaram-se as respectivas energias de moagens transferidas ao longo do processo e o composto NiAl obtido nestes moinhos foi parcialmente ordenado. O método de Rietveld foi utilizado para a determinação da quantidade de NiAl formado após a moagem nos moinhos planetário e Attritor e também para a estimativa dos tamanhos de cristalitos e da deformação da rede. Amostras particuladas obtidas nos moinhos planetário e Attritor foram consolidadas, sinterizadas a 1300ºC e caracterizadas por ensaios de flexão e microdureza Vickers; as amostras apresentaram um comportamento frágil em flexão e microdureza Vickers inferior em comparação ao valor encontrado na literatura. / A study on the effect of milling variables and high-energy mills on the NiAl intermetallic compound synthesis was performed. The effect of ball-to-powder ratio, Ni particle initial size, the use of process control agent and milling media size on NiAl synthesis in a Spex mill was evaluated using a factorial design. It was shown that ball-to-powder ratio plays an important role in the ignition time of the mechanically induced reaction of NiAl intermetallic formation; moreover, an interaction of ball-to-powder ratio, process control agent and milling media size was found to affect the particle size of milling products. During milling of Ni and Al powder, the yield of an Attritor mill was found dependent on ball-to-powder ratio and the process control agent quantity. After combustion synthesis of powders, which were previously mechanically activated in the Attritor mill, monophasic NiAl or a mixture of NiAl3, Ni2Al3 and NiAl were obtained depending on synthesis temperature; however, swelling of samples was verified in both situations. The enthalpy of formation of Ni2Al3 and Ni3Al was measured using differential scanning calorimetry and the experimental values were, respectively, 167 kJ/mol and 93 kJ/mol. NiAl compound formation occurred through an exothermic reaction in Spex and Attritor mills, on the other hand, this intermetallic was gradually formed during milling in the planetary mill, and, in this milling device, the time for compound formation was dependent on process control agent quantity. Furthermore, the energy transferred to the powder during milling in planetary and Attritor mills was estimated, and the NiAl synthesized in these devices was partially disordered. Also, the Rietveld method was employed to determine the amount of NiAl synthesized in planetary and Attritor mills, and, also, estimate crystallite size and lattice strain of milling products. Finally, milling products of planetary and Attritor mills were consolidated and sintered at 1300ºC so that Vickers microhardness and flexion tests could be performed; these tests indicated a fragile behavior, and hardness lower than the value found on literature.

Orientador: Amauri Hassui / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-16T19:30:43Z (GMT). No. of bitstreams: 1 Ventura_CarlosEijiHirata_M.pdf: 5734965 bytes, checksum: 2b91710d6113e0caaa9313bbc9b54acf (MD5) Previous issue date: 2010 / Resumo: A manufatura de um grande número de componentes na indústria depende de moldes e matrizes para processos como forjamento, metalurgia do pó, estampagem, fundição e injeção de plástico. Uma das principais operações para a fabricação destas peças corresponde à abertura da cavidade inicial, a partir da qual geometrias mais complexas são usinadas a fim de se obter o negativo do produto final. Sendo esta uma operação de desbaste, verificam-se altos esforços de corte e desgaste significativo da ferramenta. A fim de se reduzir tais grandezas, além de melhorar o acabamento (diminuindo-se o tempo necessário para semi-acabamento e acabamento final), diversas estratégias de entrada da ferramenta e de corte interno têm sido propostas. Neste contexto, o trabalho irá avaliar três diferentes estratégias para abertura de cavidades pelo método HSM em um aço AISI D2, sendo cada uma delas caracterizada pela ferramenta utilizada (I: fresa de alto avanço, II: fresa toroidal e III: fresa de mergulho), parâmetros de corte, estratégia de entrada (I: rampa, II: hélice e III: mergulho) e de corte interno (I: espiral, II: ziguezague, III: não há). Em cada uma delas serão analisados estática e dinamicamente os esforços de corte em cada trecho da cavidade e a vida da ferramenta. Além disso, é proposto ainda um modelo de forças para as diferentes formas de entrada da ferramenta na peça, que leva em conta as peculiaridades de cada estratégia. Verificou-se que o principal mecanismo de desgaste associado a todas as estratégias corresponde à adesão, fenômeno intimamente ligado à vibração do processo, excitado principalmente nos trechos em que a ferramenta tangencia as paredes menos rígidas da cavidade. Já em relação ao modelo, comprovou-se sua utilidade na avaliação prévia dos esforços médios / Abstract: The manufacturing of a great number of components in the industry depends on molds and dies used in processes like forging, powder metallurgy, deep drawing, casting and plastic injection. One of the main operations for manufacturing of these parts corresponds to the opening of the initial pocket, from which more complex geometries are machined in order to obtain the negative face of the final product. As this is a rough operation, it is characteristic of the process high cutting forces and a significant tool wear. Aiming to reduce such variables and to improve the finishing (decreasing the time for semi- and end finishing), many entry- and internal cutting strategies have been proposed. In this context, the work will evaluate three different strategies for pocket milling by HSM method in AISI D2 steel, which are characterized by the used tool (I: high-feed mill, II: torus mill and III: plunge mill), cutting parameters, entry strategy (I: ramp, II: helical and III: plunge) and internal cutting strategy (I: spiral, II: zigzag and III: no cutting). In each of the mentioned strategies not just the tool life, but also the cutting forces in each interval of the pocket will be analyzed statically and dynamically. Moreover, it is also proposed a cutting force model for the different entry strategies, taking into account their peculiarities. It was noted that the main wear mechanism associated with all strategies corresponds to adhesion, which is closely related to the vibration in the process, excited mainly in the intervals where the tool touch the less rigid walls of the pocket. Considering the model, its usefulness in the evaluation of the average cutting forces was proved / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

Made available in DSpace on 2014-10-09T12:33:49Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:03:57Z (GMT). No. of bitstreams: 0 / Neste trabalho, investigou-se a elaboração mecânica do composto intermetálico TiFe por moagem de bolas com alta energia. Uma forte aderência do material moído, particularmente nas paredes do recipiente de moagem, foi o principal problema verificado com tempos de moagem superiores a 1 hora (moinho agitador). Tentativas para resolver este problema foram realizadas inicialmente com o emprego de agentes controladores de processo (ACPs), como etanol, ácido esteárico, polietileno de baixa densidade, benzeno e ciclohexano, em diferentes quantidades (1 a 20% em massa) e tempos (1 a 40 h), mantendo-se constantes outros parâmetros de moagem como a razão bola:pó em massa (10:1) e o tamanho das bolas (=7mm). Os rendimentos mais elevados (em termos da massa de pó não aderido) foram obtidos quando se utilizaram grandes quantidades de benzeno e ciclohexano (101 e 103% em massa, respectivamente), porém com a formação de TiC ao invés de TiFe em razão da decomposição do ACP e reação do carbono com as partículas de titânio. As moagens foram realizadas posteriormente sem o emprego de qualquer ACP e também utilizando um moinho planetário. Várias estratégias foram investigadas para se tentar mitigar a aderência incluindo-se: (a) moagem de uma pequena quantidade da mistura de pós de Ti e de Fe, revestindo as paredes do recipiente e as bolas de moagem, antes da moagem da carga principal, (b) moagem pausada com aberturas intermediarias do recipiente em atmosfera ambiente, (c) moagem pausada para rotação e inversão da posição do recipiente de moagem (apenas no moinho agitador), (d) moagem isolada dos pós de Ti e de Fe, antes da moagem da mistura, e (e) moagem do pó de Fe com o Ti hidretado. Os melhores resultados, em termos de diminuição da aderência combinada com a formação majoritária do composto TiFe durante a moagem, foram obtidos quando se adotou o procedimento de inversão/rotação, juntamente com o processo de revestimento preliminar do recipiente e das bolas de moagem (26% em massa). Rendimentos maiores foram obtidos com a utilização do TiH2 no moinho planetário, porém sem a formação majoritária do TiFe durante a moagem. / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

Made available in DSpace on 2014-10-09T12:54:37Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:07:21Z (GMT). No. of bitstreams: 0 / Neste trabalho, a moagem com alta energia foi utilizada para a ativação mecânica de misturas de pós de alumínio e nióbio, na proporção de 75% atômico de alumínio, para a síntese por reação de combustão do NbAl3. O objetivo foi investigar os mecanismos de ativação atuantes e a eventual preponderância de um deles. A moagem foi realizada tanto nos pós de alumínio e de nióbio separadamente (pré-ativação), como nas misturas. O processo de síntese por reação foi realizado no modo combustão simultânea, em pastilhas compactadas a partir de misturas com e sem ativação mecânica. O comportamento térmico das pastilhas foi registrado durante todo o ciclo térmico de aquecimento e, as principais características térmicas da reação de combustão, foram determinadas. O parâmetro de rede, o tamanho de cristalito e a microdeformação elástica do alumínio e do nióbio foram determinados por difratometria de raios X, mediante análise pelo método de Rietveld. A microscopia eletrônica de varredura foi utilizada para caracterização microestrutural dos pós moídos e da pastilha reagida. Constatou-se que o mecanismo preponderante de ativação mecânica é o aumento da área de interface, que ocorre durante a formação de agregados de partículas de alumínio e nióbio. A eficiência na formação de interfaces diminuiu com a utilização de nióbio pré-ativado (encruado) e com o aumento da quantidade de ácido esteárico (utilizado como agente controlador de processo durante a moagem). O efeito principal da ativação mecânica na síntese por reação de combustão foi a redução da temperatura de ignição com o aumento do tempo de moagem. A alta densidade de defeitos cristalinos, gerada durante a pré-ativação dos pós de alumínio e nióbio e na ativação mecânica das misturas, não produziu efeitos mensuráveis sobre o comportamento térmico das pastilhas. / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energéticas e Nucleares - IPEN/CNEN-SP

Orientador: Amauri Hassui / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-23T20:30:13Z (GMT). No. of bitstreams: 1 Correa_FabianodosSantos_M.pdf: 5805847 bytes, checksum: 1e46e12c4b86d23df66529c421067901 (MD5) Previous issue date: 2013 / Resumo: A vida da ferramenta juntamente com o tempo gasto para acertos quando a mesma é substituída pode representar uma significativa parcela do custo total do produto. Desta forma, a redução destes custos é de fundamental importância para o processo. Quando se utiliza ferramentas de metal duro com coberturas, ou ferramentas com geometria definida, o desgaste mais comum que determina sua vida útil é o desgaste de flanco (VB). Este trabalho tem como principais objetivos estudar os esforços existentes na usinagem de fresamento de topo com insertos intercambiáveis redondos do aço inoxidável aeronáutico 15-5 PH e relacioná-los com o tempo de vida das ferramentas testadas. Analisar estes esforços no regime do tempo e da frequência a fim de verificar as principais forças responsáveis pelas possíveis vibrações do sistema. Tais vibrações podem ter grande parcela na contribuição dos desgastes e avarias das ferramentas. Todos os ensaios deste trabalho mantiveram constante a largura fresada (ae) de 14 mm, o corte em movimento predominantemente discordante e assimétrico com ae > D/2 (diâmetro da fresa), a profundidade de corte (ap) de 1 mm e fluido de corte em abundância. Para os parâmetros que variaram tem-se a velocidade de corte (vc) de 195 m/min e 170 m/min, os avanços por dente da fresa (fz) de 0,15 mm/dente e 0,25 mm/dente além de duas geometrias diferentes de insertos. Nas análises dos esforços foi utilizada a RMS para melhor interpretação da magnitude destes esforços. Observou-se que o aumento do avanço faz os esforços aumentarem, o mesmo aumento de esforços se deu para geometrias positivas (com quebra-cavaco) quando comparadas as geometrias neutras. No entanto, para as velocidades de corte usadas não se teve uma correlação significativa nos esforços. Para a vida da ferramenta, a vc teve influência direta na vida, o que era de se esperar, os avanços fz maiores apresentaram um comportamento inverso na vida. O maior contribuinte para o desgaste da ferramenta foi o alto atrito causado pelos esforços elevados, medidos na entrada do dente, onde a espessura do cavaco inicia-se com zero. Este comportamento do cavaco é um fenômeno comum ao corte discordante. Dentre os mecanismos de desgastes constatados, o predominante foi o desgaste conhecido como aderência (attrition) / Abstract: Tool life along with the setup time whenever it is changed may represent a big amount of the total cost of the product. This way, reducing these costs plays a fundamental role in the process. When using coated carbide tools, or designed geometry tools, the most common type of wear that determines the end of a tools life is flank wear (VB). This work has as main goals evaluate the machining forces in round inserts face milling of aerospace stainless steel 15-5 PH and relate these forces with the tool life. Evaluate the forces in time and frequency domain to check the main responsible for vibrations of the machining system. The vibrations may contribute in tool wear and failure. In all the tests, cutting width (ae) of 14 mm, up milling an asymmetric cut (with radial immersion of ae > D/2), cutting depth (ap) of 1 mm and cutting fluid conditions were kept constant. Cutting speed (vc) of 170 m/min and 195 m/min, feed per tooth (fz) of 0.15 mm/tooth and 0.25 mm/tooth, and two different insert geometries were the tests inputs. For analysis, the RMS value was used for better understanding of forces magnitude. It was observed that an increase in feed per tooth causes an increase of forces. The same behavior occurred for positive geometries (with chipbreaker) than for neutral geometry. However, the relationship between cutting speeds and forces was not significant. In tool life, cutting speed had high influence (as expected). High feed per tooth showed an inverse impact in tool life, increasing tool life. The main factor for tool wear was the high friction caused by high forces, measured in the beginning of the cut, when chip width was zero. This behavior of the chip is common in up milling. Attrition was the main mechanism of wear among all types observed / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

Increasing demand for precision components made of hard and brittle materials such as glasses, steel alloys and advanced ceramics, is such that conventional grinding and polishing techniques can no longer meet the requirements of today's precision manufacturing engineering. Particularly, in order to undertake micro-milling of optical glasses or other hard-machining materials, vibration assisted machining techniques have been adopted. However, it is essential and much needed to undertake such processes based on a scientific approach, i.e. the process to be quantitatively controlled and optimized rather than carried out with a trial-and-error manner. In this research, theoretical modelling and instrumental implementation issues for vibration assisted micro-milling are presented and explored in depth. The modelling is focused on establishing the scientific relationship between the process variables such as vibration frequency, vibration amplitude, feedrate and spindle speed while taking into account machine dynamics effect and the outcomes such as surface roughness generated, tool wear and material removal rate in the process. The machine dynamics has been investigated including a static analysis, machine tool-loop stiffness, modal analysis, frequency response function, etc, carried out for both the machine structure and the piezo-actuator device. The instrumentation implementation mainly includes the design of the desktop vibration assisted machining system and its control system. The machining system consists of a piezo-driven XY stage, air bearing spindle, jig, workpiece holder, PI slideway, manual slideway and solid metal table to improve the system stability. The control system is developed using LabVIEW 7.1 programming. The control algorithms are developed based on theoretical models developed by the author. The process optimisation of vibration assisted micro-milling has been studied by using design and analysis of experiment (DOE) approach. Regression analysis, analysis of variance (ANOVA), Taguchi method and Response Surface Methodology (RSM) have been chosen to perform this study. The effects of cutting parameters are evaluated and the optimal cutting conditions are determined. The interaction of cutting parameters is established to illustrate the intrinsic relationship between cutting parameters and surface roughness, tool wear and material removal rate. The predicted results are confirmed by validation experimental cutting trials. This research project has led to the following contribution to knowledge: (1) Development of a prototype desktop vibration assisted micro-milling machine. (2) Development of theoretical models that can predict the surface finish, tool wear and material removal rate quantitatively. (3) Establishing in depth knowledge on the use of vibration assisted machining principles. (4) Optimisation of cutting process parameters and conditions through simulations and machining trials for through investigation of vibration assisted machining.

Master of Science / Department of Grain Science and Industry / Ekramul Haque / The effect of enzyme in temper water on wheat milling performance and flour quality was studied. Five independent variables, enzyme concentration, incubation time, incubation temperature, tempered wheat moisture content, and tempering water pH, were studied. An enzyme cocktail consisting of cellulase, xylanase, and pectinase was used at 5 different concentrations. A single pure variety of hard red winter wheat was tempered under defined conditions following an RSM central composite design which required 33 tests including 7 replicates. Each treatment had 5 levels: high, medium high, medium, medium low, and low. After tempering, the physical characteristics of the wheat kernel were determined by using the Single Kernel Characterization System. An experimental laboratory mill (Ross Mill) was used to mill wheat into flour. Thirteen streams of flour, and additional streams of bran, shorts, red dog, and germ were obtained. Product yield, protein, ash, and flour color were evaluated. The data were analyzed and compared using the software SAS and RSM Plus. The data showed that incubation time was the only significant factor affecting the tempered wheat hardness (p<0.05). The treatments affected the flour yield from the break rolls more than that from the reduction rolls. However, a maximum point for flour yield was not found. The relationship between treatments and flour yield was established with a prediction model equation. Also, the enzyme effect on the dough properties and bread making were investigated. The treatments did not affect the optimum water absorption for the flours. However, enzyme treated flours showed shorter mixing times. Regardless of the differences in mixing times, the specific loaf volumes were not significantly different for the all treatments. Bread baked from the flour milled from enzyme treated wheat did not show a positive effect on bread staling.

Sorghum bicolour (L.) Moench is an important staple cereal in Africa, where it ranks second after maize. Despite its importance, the sorghum food industry remains non vibrant, constrained in part by inadequate milling technology. Presently, Prairie Research Laboratory (PRL) type abrasive dehullers and hammer mills, which apparently produce meals of inconsistent quality and low output, are generally used for industrial milling of sorghum. Efforts to improve sorghum milling require an in-depth understanding of how milling process and grain type affect the sensory characteristics of the final food products. Such knowledge is currently lacking. Therefore, this study investigated the effects of milling process and sorghum type on the quality of sorghum meal and porridge. Twelve sorghum types with diverse physico-chemical properties were milled by roller milling (RM), abrasive decortication-hammer milling (ADHM) and hand pounding (HP), and the effects on meal extraction and meal quality were evaluated. Porridges were prepared using standardised Botswana recipe, and their sensory profiles were characterised using Descriptive Sensory Analysis. Additionally, factors that affect the texture of sorghum porridge were investigated, and suggestions for improving the sorghum milling process are given. Both the sorghum type and the milling process affected the quality of the meal and the sensory characteristics of the porridge, but the milling process was found to have more effects on these characteristics than the sorghum type, because of the diverse milling principles of the milling processes. RM gave far better extraction rate and had substantially higher throughput than HP and ADHM. However, meals obtained with RM had slightly more ash and were a little darker, and gave porridges which were correspondingly darker in colour, had slightly more branny aroma, more astringency and bitter taste, than meals obtained with the other two milling processes, indicating higher bran contamination of the meals, presumably caused by fragmentation of the pericarp. Clearly, even with tempering the pericarp was still friable, and hence, requires indepth sorghum tempering studies. Grain hardness proved to be important for milling, as it correlated positively with extraction rate with ADHM and HP, but not with RM. Hard grains generally gave coarser and better refined meals, and produced porridges that were firmer, compared to soft grains. Weathered and pigmented pericarp sorghums produced dark and specky meals, and gave porridges with apparently undesirable sensory qualities, because of staining caused by the pericarp pigments, showing that these characteristics affect the quality of sorghum foods negatively. When used with hard and light coloured sorghums, ADHM gave more appealing meal and porridge qualities (light coloured, firm texture and enhanced cereal aroma), indicating that dry abrasive decortication is advantageous for production of sorghum products with superior sensory qualities. Firmness varied considerably among the porridges, caused by differences in the meal particle sizes, which was predominantly a consequence of the milling process. An increased proportion of coarse endosperm particles, as was the case with HP meals, caused increased porridge firmness. The coarse particles absorbed water slowly, thus restricting swelling of the starch granules, such that a high proportion of non-ruptured gelatinised starch granules that reinforce the porridge matrix resulted. The sorghum type also influenced porridge firmness, whereby the corneous sorghum types with high protein content produced firmer porridges, owing to presence of the hard and less waterpermeable protein-starch matrix in the endosperm meal particles. Because abrasive decortication gave meals and porridges with superior sensory qualities, while roller milling prduced high throughputs, a roller milling system that is preceded by a dry abrasive decortication process is recommended as a versatile milling process for industrial processing of diverse sorghum products that have superior sensory qualities. / Thesis (PhD)--University of Pretoria, 2009. / Food Science / unrestricted

This thesis presents models and algorithms necessary to simulate the five-axis flank milling of jet-engine impellers in a virtual environment. The impellers are used in the compression stage of the engine and are costly, difficult to machine, and time-consuming to manufacture. To improve the productivity of the flank milling operations, a procedure to predict and optimize the cutting process is proposed. The contributions of the thesis include a novel cutter-workpiece engagement calculation algorithm, a five-axis flank milling cutting mechanics model, two methods of optimizing feed rates for impeller machining tool paths and a new five-axis chatter stability algorithm. A semi-discrete, solid-modeling-based method of obtaining cutter-workpiece engagement (CWE) maps for five-axis flank milling with tapered ball-end mills is developed. It is compared against a benchmark z-buffer CWE calculation method, and is found to generate more accurate maps. A cutting force prediction model for five-axis flank milling is developed. This model is able to incorporate five-axis motion, serrated, variable-pitch, tapered, helical ball-end mills and irregular cutter-workpiece engagement maps. Simulated cutting forces are compared against experimental data collected with a rotating dynamometer. Predicted X and Y forces and cutting torque are found to have a reasonable agreement with the measured values. Two offline methods of optimizing the linear and angular feeds for the five-axis flank milling of impellers are developed. Both offer a systematic means of finding the highest feed possible, while respecting multiple constraints on the process outputs. In the thesis, application of these algorithms is shown to reduce the machining time for an impeller roughing tool path. Finally, a chatter stability algorithm is introduced that can be used to predict the stability of five-axis flank milling operations with general cutter geometry and irregular cutter-workpiece engagement maps. Currently, the new algorithm gives chatter stability predictions suitable for high speed five-axis flank milling. However, for low-speed impeller machining, these predictions are not accurate, due to the process damping that occurs in the physical system. At the time, this effect is difficult to model and is beyond the scope of the thesis. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate

Mechanical Alloying is a manufacturing process that produces alloys by cold welding of powders. Usually, a vial containing both the powder and steel balls is agitated. Due to impact between the balls and balls and the vial, the powder is mechanically deformed, crushed, and mixed at nano-scales. In this thesis, a numerical model is developed to simulate the dynamics of the vial and the grinding balls of the SPEX 8000 ball milling device, a standardized equipment in both industrial and academic investigations of ball milling. The numerical model is based on the Event Driven Method, typically used to model granular flows. The method implemented is more efficient than the discrete element method used previously to study ball milling dynamics. The numerical tool obtained is useful for scale-up and optimization of mechanical alloying of various materials. An optimization study is presented for the SPEX 8000.