and 3 and the working rollers can also be arranged in accordance with the actual requirement moreover the more the adjusting mechanisms for the working rollers are involved the better the effect of the forming will be the flexible forming device according to the second embodiment of the present invention which is also used for forming three dimensional plate shaped workpieces will be described below with reference to fig9 15 this flexible forming device is basically similar in structure to that of the first embodiment except that the flexible working rollers can be classified into two types integral and segmented ones while the latter can rotate synchronously or asynchronously in the same or opposite direction in addition a variety of assistant mechanisms providing reliable control and adjustment for this flexible forming device are also set up respectively in the embodiment of fig9 an adjusting rod 14 see fig1 of the adjusting mechanism 3 can be regulated by manual control or a numerical control system according to the three dimensional shape required by the plate shaped workpieces so that the open bearing 13 see fig1 pulls or presses the flexible working roller 1 and causes it to bend an expansion unit can be set on one or both ends of the flexible working roller to ensure its free expansion.