Gökhan UÇAN-030070028-6th week

Capacity Requirements Planning: 17.03.2011 19.37
Capacity requirements planning is concerned with determining the labor and equipment requirements needed to meet the master production schedule. It is also concerned with identifying the firm's long-term future capacity needs. Capacity planning also serves to identify production resource limitations so that a realistic master production schedule can be planned. A realistic master schedule must be compatible with the manufacturing capabilities of the plant that is to make the products. The firm must be aware of its production capacity and must plan for changes in capacity to meet changing production requirements specified in the master schedule.

(Mikell P. Groover,Fundamentals of Modern Manufacturing,4th Edition,pg.962-963)

Laser-Beam Welding: 17.03.2011 20.50

(LEW) is a fusion-welding process in which coalescence is achieved by the energy of a highly concentrated, coherent light beam focused on the joint to be welded. The term laser is an acronym for fight amplification by stimulated emission of radiation. This same technology is used for laser-beam machining. LBW is normally performed with shielding gases (e.g., helium, argon, nitrogen, and carbon dioxide) to prevent oxidation. Filler metal is not usually added.

LBW produces welds of high quality, deep penetration, and narrow heat-affected zone. These features are similar to those achieved in electron-beam welding, and the two processes are often compared. There are several advantages of LBW over EBW: no vacuum chamber is required, no X-rays are emitted, and laser beams can be focused and directed by optical lenses and mirrors. On the other hand, LBW does not possess the capability for the deep welds and high depth-to-width ratios of EBW. Maximum depth in laser welding is about 19 mm (0.75 in), whereas EBW can be used for weld depths of 50 mm (2 in) or more; and the depth-to-width ratios in LBW are typically limited to around 5:1. Because of the highly concentrated energy in the small area of the laser beam, the process is often used to join small parts.

(Mikell P. Groover,Fundamentals of Modern Manufacturing,4th Edition,pg.728)

Sand Blasting: 17.03.2011 21.03

Blast finishing uses the high-velocity impact of particulate media to clean and finish a surface. The most well known of these methods is sand blasting, which uses grits of sand (S1O2) as the blasting media. Various other media are also used in blast finishing, including hard abrasives such as aluminum oxide {AI2O3) and silicon carbide (SiC), and soft media such as nylon beads and crushed nut shells. The media is propelled at the target surface by pressurized air or centrifugal force. In some applications, the process is performed wet, in which fine particles in a water slurry are directed under hydraulic pressure at the surface.

(Mikell P. Groover,Fundamentals of Modern Manufacturing,4th Edition,pg.662)

Lancing: 17.03.2011 21.20

Lancing is a combined cutting and bending or cutting and forming operation performed in one step to partially separate the metal from the sheet. Among other applications, lancing is used to make fouvers in sheet metal for venting of heat from the interiors of electrical cabinets.

(Mikell P. Groover,Fundamentals of Modern Manufacturing,4th Edition,pg.460)