5/1/09

MACHINING BEHAVIOR WITH MAGNETIC FIELD ASSISTANCE

Machining is a process matter with complex dynamics, including an economic dimension and the physical aspect generated by the cut. Performance, productivity, quality of generated surfaces, time and manufacturing costs are the most important criteria in adequate manufacturing processes. Material removals rates with the uncut chip thickness, feeds, cutting speeds provide adequate tool live. This segmentation phenomena influences in the chip morphology, tool forces, chip-tool interface temperatures, and the dynamic behavior of the cutting system.

A chip formation mechanism is modified (plastic deformation within the chip by the tool contact under magnetic field) and the joint effects by hard contact between tool-chip-material. Wear on the flank face appears to be from tear out that typically occurs when welded asperity junctions between the work material and tool face are fractured by a shearing force. Tool wear are noticeably different when a magnetic field is introduced. Minuscule fragments of the tool material are torn out. This may involve some chemical interaction of the tool surface with the surrounding atmosphere. A valid explanation is founded by pinning effect of the dislocations alone cannot account for the strong degradation of the magnetic properties observed at the very beginning of the strain-hardening. Therefore, considerations on the magnetoelastic anisotropy induced by the long-range internal stresses have been proposed.



This research explores the magnetic field application as assistance in machining process. The study proposes necessary elements to understand the cutting mechanisms under magnetic field. Results of orthogonal cutting tests carried out on dry cut of magnetized AISI 1045 steel using nonmagnetic carbide insert; it shows the increasing lifespan of the cutting tools by magnetic field assistance. The study is separated into two groups: (i) a change in the mechanics of cutting (shear angle, shear strain and cutting ratio) and (ii) tribological surface modifications of the tool-chip contact in the presence of magnetic field.

Tribological investigations show that magnetic field has significant influence on the friction and wear of the materials. The magnitudes of coefficient of friction and wear rate are strongly dependent on the magnetic field intensity; Oxide films are generated as result of exposure to magnetic field. The nature of oxide film governs the change in friction and wear. Magnetic field assistance improves the machined surface quality and the manufacturing process.




The effect of cutting and tangential force on magnetic field influence has been identified through the changed measured during the experiments. Cutting forces measurements performed in 2D cutting with magnetic field influence and different speeds revealed a decrease in cutting forces when magnetic field influence was augmented. Using a confidence level of 96%, (Shapiro-Wilk test) an average cutting force diminution of 3.4% and tangential force of 15% were measured (results presented in appendix A). Magnetic field modifies the mechanics of cutting at the tool chip interface in three ways as reported. The magnetostriction effect, heat augmentation and microstructure variation are possible explanations for the enhanced performance of materials under magnetic field.


Scanning electron microscope (SEM) images and optical microscope images were taken for obtaining zoom-in look at the wear and microstructure and to better understand the phenomenon involved behind the result. The variation of chip morphologies as a function of cutting speed and magnetic field produces an effect on tool wear. Figure 34 depicts the damage of tungsten carbide inserts after the contact, for cutting speed of 54.6m.min-1, tangential feed of 0.1mm.rev-1 and magnetic field of 2kA.m-1 representing typically SEM observations of the worn threat resulted after the experiments.

4/10/09

High style doors design in aluminum frame for office divisions and apartments

The French company ABCD International since 1980 manufactures profiles and accessories for movable office divisions and sliding doors of wall cupboards. This company turned into the innovation of its products, creating new styles and models in agreement with the current tastes of the customer requests of the local market and international.


MAPPING OF PRODUCT




An analysis of the joint tendencies will make it possible to find the solution with the customer requirements and for the market, to create an aesthetic and functional, coherent and balanced unit. Thereafter we will carry out a study of the market. The subject relates to in particular the design of a beating door and its rail for a sliding door ABCD International. The needs for the company include/understand the design of a new design of door, by integrating the factors “engineering”, “ergonomics”, “design”, “marketing”, “sensory perception” and “sociology of use and installation”.




SWINGING DOOR IN ALUMINUM FRAME




The door frame made with a slight aluminum profile filling out of opalescent glass is not present into the French market. The highlights of the design are price and high style for the competitive market of ABCD. Mechanical characteristics was one important fact for the success of this project as hinges, casters, assembly, wear resistance, etc. Regarding the methodology of products design, the objectives of the project lend themselves perfectly to the installation of the step of design “Modeling of the process of design centered user, based on the integration of the methods and tools of ergonomics and sensory perception to the creation of a modern door of style.”



The door are designed for both standard and customised doors (wood, glass, aluminum framework, single or double glazing). ABCD International introduce a door with technological innovation, exclusive style and maximum quality certified in terms of European standards. Exceptional design freedom ranging from the variety of lacquered glass finishes and various aluminum finishes.



The final objective of this project, is to subject to the company the design and the implementation of a new product. This one will be proposed at the international market and more particularly in Italy and Russia.




SLIDING DOOR

The second part of the project was the creation of a demountable swinging door offering a system with suspended doors fixed in the wall or the ceiling adaptable to Decorange series. The system of sliding panels designed to divide spaces and characterized by an extremely rigorous design. A structural profile in aluminum of minimal thickness holds a double glass, gifted with an optimal soundproofing capacity.




This is the result of the continuous technological and stylistic research within the field of sliding panels. The project that guarantees an exceptional reliability and easy installation thanks to the quality of the patented sliding system, proposing at the same time a extremely rigorous supports. An actual and real glass wall, with very light movements, that allows the light to flow from one into another room and to create an active subdivision of the habitats.




3/26/09

Aerodynamic Bus Coach



The following Marcopolo S.A. and the University of America project try to provide a solution of gas consummation using an aerodynamic design for long distance buses. The design of this coach is an imitation of the more perfect aerodynamic design in nature; “the drop of water.” In fact, the coach needed serious aerodynamic research in a wind tunnel before to conceiving the final product. This project includes: FEA aerodynamic analysis, drag and lift coefficient calculation, clay models and several on scale wind test economic and reliability evaluation for in-line production were applied.



The prototype proved the benefits of aerodynamic improvements with some useful advantages resulted in: The fuel consumption decrease, major conduction security, general vibrations reduction in coach, general appearance improvement, diminution of, better distribution of the weight throughout all the vehicle, and, multiplication of motor efficiency. The benefits are considerable interest, speaking also of the security improvement for the driver and the economic factor.







Samples of 2D aerodynamic FEM Analysis made with Algor