司筒 meaning in Chinese

ejector sleeve

Does this part need an ejector pin or an ejector bar ? can we add an ejector blade
这个产品的柱位我们打算做司筒。（或镶针）可以吗？
The product has excellent tooling quality and machining performance , so as to alleviate and avoid the deformation of ejector pin because of heat treatment
该产品具有良好易切削性能和机械加工性能，从而避免了薄壁推管（司筒）因热处理而产生变形。