精品无码久久久久成人漫画,好大好紧好硬好湿好硬视频免费,在线播放亚洲第一字幕,极品美女高潮呻吟国产剧情

 The wiredrawing mold usually points to each kind of drawing Jin Shuxian's mold, but also has pulls optical fiber's wiredrawing mold. All wiredrawing mold's center has certain shape hole, the circle, the side, the star anise or other special shapes. The metal is being pulled passes through when the nib the size changes is small, even the shape changes. Staking metal (for example money) when the steel die is sufficient, on the steel die may have many different aperture holes. The drawn wire (steel wire) uses the carbide die generally (Tungsten carbide nib), this kind of mold's modular design is a cylinder (or slightly has taper) the hard alloy mold core mounts closely in circular steel bushing (case), in the mold core in the hole has the trumpet-shaped object (Bell radius), the approach cone (Entrance angel), the distortion (work) the awl (approach angle), to decide the diameter to bring (bearing) and the argument (back relief). Pulls colored Jin Shuxian, like copper, aluminum, also uses with the steel wire mold similar wiredrawing mold, in hole shape some differences, pull the fine lace as available as the crystal combination mold (man-made diamond), but also has with the natural diamond wiredrawing mold.

　　On the Chin Shihhuang burial figures of warriors and horses' some soldier's stone armor can see has Jin Shuxian, therefore estimated that at that time has mastered the wiredrawing technology on some people. In the super craftmanship opens in the thing that Ming Dynasty's books we to be able to see that needle's production process, has the wiredrawing mold's use.

　　Wiredrawing mold's definition

　　Usually refers to each kind of drawing Jin Shuxian's mold, but also has pulls optical fiber's wiredrawing mold. All wiredrawing mold's center has certain shape hole, the circle, the side, the star anise or other special shapes. The metal is being pulled passes through when the nib the size changes is small, even the shape changes.