A new hollowshell formation method, the reverse bending process, is presented.
介绍了一种新型管坯成型方法——反弯成型法。
2
The fan frame is provided with an outer frame, the inner side of the outer frame forms a hollow motor shell in an integrative molding way.
该扇框具有一个外框部，该外框部内侧以一体成型方式 形成中空的一个马达壳；
3
This paper expounds the making technology and technical properties of a new compound block which USES the hollow concrete block as the shell and is filled with foam concrete in its cores.