Core construction components (or inserts) may include wheel hubs, bearings, fasteners, injection-molded parts or castings.
滚轮产品的核心组成部分包括轮毂，轴承，紧固件或铸件。
2
According to the size of the molded components, the mechanism of loose the core and ejecting were designed under the assembly environment.
在装配的环境下根据成型零件完成抽芯机构和推出机构的设计。
3
The same principle applies here as to stripping any internal undercut i. e. the molding must be free to expand during ejection to permit the molded undercut to ride over the restriction on the core.