In the process of drilling CFRP sheets by industrial robots, contact stiffness between terminal actuator and sheet is poor, which causes hole position to vibrate during processing. The design a presser foot device in front can effectively solve this problem. Navier method used allowable range pressing force foot. A numerical simulation model for established, influence different forces within on...

To eliminate or reduce stick–slip vibration in torsional of the drilling string and improve rate penetration (ROP), a model considering ROP was established based on multidimensional string. The verified by simulation analysis. characteristics three stages stationary, slip, stick were analyzed. This paper investigated influence rotary torque, speed, weight bit (WOB) vibrations drill Based this, ...

The longitudinal vibration of the drill pipe contains considerable energy which can be used to improve rock-breaking efficiency during drilling. It is very important development drilling speed-up tools have a comprehensive understanding conversion downhole string vibration. In this paper, characteristics bit load and under different conditions were studied in experiment, analysis method from sp...

Geometry generators are commonly used in video games and evaluation systems for computer vision to create geometric shapes such as terrains, vegetation or airplanes. The parameters of the generator are often sampled automatically which can lead to many similar or unwanted geometric shapes. In this paper, we propose a novel visual exploration approach that combines the abstract parameter space o...

Diamond turning of steel alloys is impractical due to catastrophic tool wear caused by a combination of chemical and abrasive wear. In the literature, several modifications of the cutting process have been proposed, e.g. cutting in an inert gas atmosphere, cryogenic cutting and vibration assisted cutting, e.g. elliptical vibration cutting (EVC) [1-5]. In this work, the EVC method was investigat...

OBJECTIVE To introduce a robot-assisted surgical system for spinal posterior fixation that can automatically recognize the drilling state and stop potential cortical penetration with force and image information and to further evaluate the accuracy and safety of the robot for sheep vertebra pedicle screw placement. METHODS The Robotic Spinal Surgery System (RSSS) was composed of an optical tra...

An experimental study of the rotary ultrasonic drilling of ceramics is first presented. The influence of different process parameters on the material removal rate for machining of magnesia stabilized zirconia is examined. Then a mechanistic approach to modeling the material removal rate during rotary ultrasonic drilling of ceramics is proposed and applied to predicting the material removal rate...