Abstract
Precise processing for complex geometric surfaces of titanium alloy artificial joints has higher technical difficulties. This paper addresses the matter by proposing an improved abrasive flow processing method. According to the micro-cutting principle, the processing mechanism on curvature surface of the titanium alloy workpiece by the abrasive flow is analyzed. A new material removal model of abrasive flow is proposed to reveal the processing regularities for complex geometric surfaces of titanium alloy artificial joints. Based on the model, in combination with the realizable k-ε turbulence model, the total force affecting on a wall region of constrained flow passage is obtained to estimate the quantity of material removal. A multi-segment profiling constrained flow passage is designed, and an optimized flow passage scheme is provided. Numerical results show that the optimized flow passage can improve the pressure/velocity profile uniformities of abrasive particles; by the product of velocity and pressure, the cutting coefficient for complex surface is obtained. A processing experimental platform is developed, and the processing experiment results indicate that the proposed material removal model can estimate the processing effects and removal regularities, and the size accuracy and surface quality of the titanium alloy surface are improved.
Highlights
Titanium alloy materials have been widely used in many engineering areas, especially for the artificial joints manufacturing, because of their high specific strength, good corrosion resistance and excellent biocompatibility [1,2,3,4,5,6]
For the According to the load analysis of single abrasive particle and the statistic distribution of abrasive particle in the flow passage, a material removal model of abrasive flow processing is proposed
The constrained profiling constrained flow passage for titanium complex surface artificialjoint joint is composed composedconstrained of multi-segment constrained and workpiece surface, the numerical model of multi-segment modules and modules workpiece surface, and theand numerical model is shown as is shown as Figure 7
Summary
Titanium alloy materials have been widely used in many engineering areas, especially for the artificial joints manufacturing, because of their high specific strength, good corrosion resistance and excellent biocompatibility [1,2,3,4,5,6]. Rajendra set up a model for material cutting and surface texture of fluid-based processing, and computed the tangential force on machined surface to explore the effect of normal force on the energy consumption [20]. Joints, By the multi-segment profiling constraint modules, a circular constrained flow passage that can this paper proposes an improved abrasive flow processing method for complex geometric surfaces. The machined surface becomes a part micro-cutting effects are conducted by the disorder movement of abrasive particles, and the of the wall flow passage. Basedand on the above model, grinding force, particle and cutting coefficient researched, a new material in combination with the realizable k-ε turbulence model, the total force affecting on a wall region removal model of abrasive flow is set up. Totechnical estimatesupports the quantity of material removal, and flow to provide technical supports for the regulation of abrasive flow processing
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