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我们知道,普通10公厘以下的圆头螺丝,平头螺丝,木螺丝一般是用圆铁在打头机上自动切断,冲锻出螺丝头,然后送到滚丝机上滚出螺纹。这个横螺丝头的模子如图1所示,内孔接近头部的地方需要很硬,以防止头部受涨变形;内孔接近螺丝杆的地方,也就是图中K处,需要有适当的硬化层,避免螺丝杆受镦变粗,而严格地控制着螺丝的直径;模子外层的硬度由内向外逐渐减低,使它在工作时受到振动而不致碎裂。这种模子起先我们是用高碳钢制造,经过热处理后发现有下列几个毛病:①
We know that ordinary 10 mm below the round head screws, flat head screws, wood screws are generally round iron in the head machine automatically cut off, punch out the screw head, and then sent to the thread rolling machine out of the thread. The horizontal screw head mold shown in Figure 1, the hole close to the head of the place need to be hard to prevent deformation of the head by the deformation; the hole near the screw rod place, which is the figure K, you need to have the appropriate Hardened layer, to avoid the screw rod by the upsetting coarse, and strictly control the diameter of the screw; mold hardness of the outer gradually reduced from the inside out, so that it will work in the vibration without fragmentation. This mold at first we are made of high carbon steel, after heat treatment found the following problems: ①