一基本概念切削螺絲的工具,大家都已經很熟悉了,現在来谈谈滚壓螺絲的工具。滾壓螺絲的時候,沒有切屑;無論用平模或者用圓模來滚压,模子都是壓進去的。滚壓後,金屬的外表面就變形而現出螺紋。所以,滚壓的過程也可以說是一種塑性變形的過程。因此,滾壓螺絲時所用的平模或者圓模,按照它們的作用來說,决不能属於切削工具的範圍內。 為了比較起見,[圖一]表示出滾壓出來的(a)和切削出來的(b)螺栓斷面金属纖維分佈的情形。滚壓的時候,金属纤維祇不過形狀變了,但是並沒 A basic concept of screw-cutting tools, we are already familiar with, and now to talk about rolling screw tools. When rolling the screw, there is no chip; no matter the flat die or the round die is used for rolling, the die is pressed in. After rolling, the outer surface of the metal deforms and threads appear. Therefore, the rolling process can also be said that a plastic deformation process. Therefore, the flat or round mold used to roll the screw must not, in the sense of their function, fall within the scope of the cutting tool. For the sake of comparison, [Figure 1] shows the distribution of the metal fibers in the section (a) of the rolled out (b) bolt section. When rolled, the metal fiber just changed shape, but did not