Abstract:

In order to solve the problem on constant cover factor of the braided protective layer of mandrels with a rotary curved surface such as torpedoes and projectile, this paper proposed a method for realizing braiding of constant cover factor by controlling the proportional relation between the spindle speed and the pulling speed. A mathematical model of the braiding cover factor related to the braiding angle, mandrel radius and cone angle was built based on the analysis of local braiding structure. By the inverse solution method, the local fabric pulling speed and the spindle rotation speed were acquired firstly, and then model were extended to all length range of the variable diameter fabric by integral principle. By using MatLab, the variation of braiding point height, braiding angle and pulling speed about the mandrel radius was calculated, and the density of the different part of the fabric were tested by the Solidworks model. The results show that the braiding cover factor of each part of the mandrel is equal, verifying the correctness of the newly built mathematical model.

Key words: variable diameter braiding, braiding cover factor, braiding angle, take-up speed, simulation