Hydro-cylinder Material: aluminum alloy; features: the cylinder which is of deep hole and special shape in the middle is produced with complicated extrusion process -Application: applied as an accessory of take-off and landing device of military high-performance steam boat -Client Problem: the product is of deep hole and special shape in the middle, thus it is difficult to be processed -QH Solution: through extrusion process, QH realizes direct forming of the products of complicated shape -Benefits: save materials and improve the performance