英国某大学研究小组发表一项科研成果,采用新设计法能降低螺纹牙的最大应力,从而提高连接强度。以往的螺杆与螺帽的大部份载荷由螺帽结合面附近的螺纹牙承受,因此,这种螺纹牙本质上会引起应力集中,限制了承受的负载。一种解决方法是将螺纹加工成锥状。即先在使连结部与另一边的螺纹牙上预加负载,此法虽可分担较大的载荷,但不适应于大批量生产。另一解决方法如图1所示,是改变螺帽形状的方法。该方法是将结合面由平面作成呈θ角倾斜的锥状面的同时,在结合面附近设置环状沟槽。通过这种措施,承受连接载 A British university research team published a scientific research, the use of new design method can reduce the maximum stress of the thread, thereby enhancing the connection strength. In the past, most of the load of the screw and the nut was borne by the thread near the joint surface of the nut. Therefore, the thread tooth inherently caused stress concentration and limited the load to be borne. One solution is to thread the taper. That is to say, the connecting part and the thread on the other side should be preloaded first. This method can share large load, but not suitable for mass production. Another solution, shown in Figure 1, is to change the shape of the nut. In this method, an annular groove is provided in the vicinity of the joint surface while the joint surface is formed into a tapered surface inclined at an angle? Through this measure, bear the connection set