Elastic connecting element, processing method thereof and flexible drill including elastic connecting element

A processing method of the elastic connecting element, comprising steps of:

• S1:
• fixing a circular tube on a workbench, and cutting the circular tube by a laser to obtain a housing,
• wherein the housing comprises the outer housing and end heads arranged at the two ends of the outer housing;
• and
• S2:
• placing the elastic part in the housing to make the elastic part fixedly connected with the two ends of the outer housing to obtain the elastic connecting element,
• wherein each of the convex teeth comprises a connecting portion and at least one protrusion portion;
• and the connecting portion has one end connected with the main body of the connecting body, and the other end connected with the at least one protrusion portion,
• wherein the step of cutting the circular tube by a laser to obtain a housing comprises processes of:
• cutting for an end surface of the end head of the housing;
• and
• cutting for a matching slit between a convex tooth and a groove,
• wherein the cutting process for a matching slit between the convex tooth and the groove, which is laser cutting, involves a first laser track and a second laser track,
• wherein a starting point and an ending point of the first laser track are set in a region between a top of a first convex tooth of a connecting body and a bottom of a groove of a connecting body adjacent to the connecting body, with the groove corresponding to the first convex tooth;
• and after entering a first laser-contact incoming point at the top of the first convex tooth from the starting point, the first laser track runs to a top of a last convex tooth sequentially along edges of the convex teeth and the grooves of the connecting body, then enters a bottom of a groove of the adjacent connecting body matched with the last convex tooth, runs to a first laser-contact outgoing point at the bottom of the groove matched with the first convex tooth along edges of the grooves and the convex teeth of the adjacent connecting body, and then reaches the ending point.