VGS, or Variable Geometry System, turbocharger is a unique system featured by the installation of vanes which revolve all at once to form a proper gap for the suited velocity of exhaust gas flow toward a turbine rotor. Thus exhaust gas hits multiple turbine vanes properly by the control of exhaust gas pressure with the VGS electronic function, which enables turbocharger to induce the most relevant combustion at both low and high rotation of the engine. As a result, VGS turbocharger is useful to avoid the generation of lag response as well as PM (particle materials/ black smoke), and other adverse elements, realizing with dynamic functions such as torque, horse power etc. to engines.

The Kyoto Protocol, the international agreement, aiming to prevent global warming, was adopted in 1997. This protocol obliges industrialized countries to reduce greenhouse gas emissions. By 2012, Japan has to reduce its annual emissions by at least six percent from the level in 1990, U.S.A. by seven percent and EU by eight percent, respectively. VGS, our main product, is indispensable for car manufactures to achieve this strict target. In a few years, VGS will be installed on most of the diesel trucks in Japan. Also the demand from Europe, which has severe environmental standards, is increasing. Described earlier, actual VGS production has already started to show the increased tendency year by year, meeting both domestic and foreign uses.

It is noted that VGS units and their related products by AFB are of totally comprehensive on the basis of our fine blanking core technology. In this regard, we are doing our best to make a research and development works of assorted factors to improve the products - designing, materials, surface treatment, fine blanking dies/ tools, complex-directed (progressive) fine blanking process / its software technology, and highly automated assembling / inspection equipment. This is essential particularly because VGS are applied to the severe conditions in high temperature exhaust gas containing water vapor, many thermal cycles, and long time use. These ambient applications mean disadvantages against elevated temperature endurance - mainly friction / wear and oxidation.