Hidden troubles of wind turbine quality 3

Problem ll :Wind turbine Tower flange manufacturing belongs to intensive equipment manufacturing with relatively larger initial investment.For example, it must ensure the forging ratio no less than 4.5 in the forging process in order to make wind turbine tower flange meet higher standard requirements at strength, pIasticity, fatigue resistance and Iow--temperature impact toughness which requires Sufficient forging equipment capacity. Forging press must be over 3000T-4000T, ring ro1l must be over 5M, but the price of such an equipment host device is generally between 10 mi1lion and 20 mlllion. It is hard for small enterprises to meet such equipment level due to limited capita1 strength, therefore, they can only lower the standards, manufacture in a rough and slipshod way, use small equipment to do the tough work which does not guarantee the quality and cause many troubles and hidden dangers of accidents to the product and vertical axis wind turbine.