Micro Milling Research Papers - Academia.edu (original) (raw)

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- Mechanical Engineering, PMMA, Micro Milling

The air-jet and ball-mill are frequently used in fine micronization of active pharmaceutical ingredients to the order of 1-5 microm, which is important for increasing dissolution rates, and also for pulmonary delivery. In this study, we investigated the ability of air-jet and ball-mill to achieve adequate micronization on the lab scale using a model soft material, Pluronic F-68. Material mechanical properties were characterized using the nanometer 600. Pluronic F-68 was ball-milled in a micro-mill at different material weights and durations in liquid nitrogen vapor. In comparison, a lab scale air-jet mill was used at various milling parameters according to a full factorial design, where the response factors were particle yield and particle size distribution, which was analyzed using laser diffraction and scanning electron microscopy. The yield achieved with the micro-ball mill was 100% but was ~80% for the air-jet mill, which reduced the size of Pluronic F-68 from 70 microm to sizes ranging between 23-39 microm median diameters. Ball milling produced particles less than 10 microm after 15 min. Although air-jet milling proved capable of particle size reduction of the relatively soft material Pluronic F-68, limitations to the lower size range achievable were observed. The feed rate of the material into the air jet mill was a significant factor and slower feed rates lead to smaller sizes by allowing more time for particle collisions and subsequent particle breakage to occur. Micro-ball milling under cold condition was more successful at achieving a lower range particle size reduction of soft materials.

- by Imran Saleem
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- Aerosol, Milling, Micro Milling, Ball Milling
- by Jasvarinder Chalotra
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- Micro Milling, Cnc Turning
- by Imran Saleem
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- Materials Science, Medicine, Elasticity, Air

The air-jet and ball-mill are frequently used in fine micronization of active pharmaceutical ingredients to the order of 1–5 μm, which is important for increasing dissolution rates, and also for pulmonary delivery. In this study, we investigated the ability of air-jet and ball-mill to achieve adequate micronization on the lab scale using a model soft material, Pluronic® F-68. Material mechanical properties were characterized using the nanometer 600. Pluronic® F-68 was ball-milled in a micro-mill at different material weights ...

- by M Imran Saleem
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- Scanning Electron Microscopy, Elasticity, Air, Aerosol

A process geometry model determines engagement angle and instantaneous uncut chip thickness which forms basis in predicting cutting forces and surface quality in micro-end milling operation. This paper presents a process geometry model incorporating cutter runout, elastic recovery of work material and minimum chip thickness. These characteristics are incorporated effectively by realizing different engagement cases that are likely to occur during micro-milling. The model considers interactions of tooth trajectory under consideration with surfaces generated by previous teeth to develop a realistic process geometry model. It has been demonstrated that the inclusion of tooth trajectory interactions has significant effect on prediction accuracy of a model. The results are also substantiated by conducting machining experiments at various cutting conditions.

- by Tesfaye M Moges
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- Manufacturing, Machining, Micro machining, Milling

We report the machining characteristics and machinability of a nickel based superalloy in this study. A micro-milling operation is loaded on Nimonic 75 using uncoated and TiAlN coated tungsten carbide micro-end mills. A full factorial design of experiments was devised to optimize the machining conditions to reduce the flank wear on the tool surface. The optimized machining conditions for uncoated micro-tools were found to be a cutting speed (v c) of 13 m/min and a feed rate (f z) of 6 mm/min. Following this, the tools were coated with TiAlN using a semi-industrial four-cathode reactive pulsed direct current unbalanced magnetron sputtering system. Further experiments were then performed using these optimized machining conditions using both uncoated and TiAlN coated micro-tools in order to ascertain the tool wear and surface integrity. The change in geometry of the machined slot was estimated based on the variation in tool radius of the micro-end mill with progression of the operation. A direct comparison was made between the results observed using both uncoated and TiAlN coated tungsten carbide to illustrate the effect of the nanocomposite TiAlN coating. It was seen that TiAlN coated micro-tools exhibited a superior performance as compared to the uncoated ones with respect to tool life and micro-burr formation.

- by Harish C Barshilia, Ph D
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- Tool wear, Micro Milling, Slot geometry, Burr formation

By the end of 2015 Helvoet Lommel has installed a brand new CNC pocket milling machine for plastic fuel pump housings. What are the properties of this innovative equipment and how can it help us to offer you more precise products? Every year Helvoet Lommel is producing millions of very narrow tolerated fuel pump parts in thermoset and thermoplastic material and has already for years in-house post processing equipment for single and double-sided flat grinding and pocket grinding operations. By adding pocket milling to our post processing technology platform we are now capable of offering a full range of in-house services for either impeller, spindle or gerotor pumps. The new invested pocket milling machine has been developed for CNC milling of plastic gerotor housings and operates fully automatically in one cell. The automatic line consists of following flow: • Bulk input of housings • Orientation • CNC milling • 100 % inline measurement of pocket inner diameter, • 100 % inline measurement of pocket depth • 100% inline measurement of gear set bearing outer diameter • Washing and drying station • Packing

- by Ruud Kraaij
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- Pumps, Thermoset Resin, Micro Milling, Surface Finish Parameters in Milling Process