用螺纹联接并起紧固作用的零件称为螺纹紧固件。常用的螺纹紧固件有螺栓、双头螺柱、螺钉、螺母、垫圈等。
Parts with threads used for joining and fastening are called screw fasteners. The most widely used components as screw fasteners are bolts, double screw bolts, screws, nuts, washers.
针对头部无螺纹和有螺纹的注塑螺杆，使用POLYFLOW软件数值模拟了注塑机螺杆计量段熔料在注射过程中的三维等温流场。
Three-dimensional isothermal material flows in the metering section of injection molder with different screw heads during injection molding are simulated through POLYFLOW software.
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