Heating method, should be uniform, equidistant (20 mm axial distance around), spin out from the center outward, and then screwed by the center outward in order to maintain temperature uniformity.

• 加热方法，应匀速、等距（距轴面20毫米左右），从中心向外旋出，然后由外向中心旋入，以保持温度均匀。