Papers by Author: B.L. Yin

Abstract: At present, the great efforts Robot or the robotic arm of the smaller volume urgently needs to be researched and developed. Designed a new smaller volume heavy articulated Robotic arm test system of combination servo drive, created the mathematical models of the system, done the numerical simulation and PID optimulition of the system based on the MATLAB software platform. Simulation results show that, according to the synchronized control and PID optimization, this system has the advantages both of high positioning accuracy for motor drive system and of strong driving capability for hydraulic drive system， it showed high tracking accuracy and high speed of response for the input signal of large load, and has realized a combination servo drive of a smaller volume heavy articulated robotic arm of fast high-precision.

Abstract: As high-speed steel tap is incapable of small-hole tapping (M3) in hardened steel, vibration tapping is introduced in this paper to solve this problem. Theoretic analysis with fracture mechanics indicates that the impact effect of the tap on the workpiece results in extended micro cracks and a much lower tapping torque. And the torsional rigidity of the tap is enforced in vibration tapping as proved by dynamic analysis. The experimental results show that with well chosen amplitudes, tapping torque decreases as vibration frequency increases and increases with the increase of net cutting time ratio, with the latter being the more significant influencing factor. In vibration tapping of hardened steel, 24 threads can be machined with a single tap. Vibration tapping is then proved to be a practical solution to the problem of small-hole tapping in hardened steel.