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The Technologic Research of Mould Structural Surface Polishing Processing Based on Flexible Liquid-solid Two Phase Abrasive Flow

Author: PanYan
Tutor: JiShiMing；WangZhongFei
School: Zhejiang University of Technology
Course: Mechanical and Electronic Engineering
Keywords: liquid-solid two phase abrasive flow mould structural surface polishing processing Fluent emulation Simulation technological experiments
CLC: TG76
Type: Master's thesis
Year: 2009
Downloads: 125
Quote: 10
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Abstract


There are a lot of tiny structural surfaces in mould manufacture. They can’t be polished by tools because of the little size or the shape. Therefore, a new method of the technologic research of mould structural surface polishing processing based on flexible liquid-solid two phase abrasive flow is brought forward. The characteristic of this method are: 1) The special flow passage is formed from the designed restricted module in combination with the structural surface. Based on the low viscosity or zero viscosity of the flexible abrasive flow, the turbulent flow is formed in the flow passage, and flow into any complicated section flow passage. The walls of the mould is well touched by the flow; 2) The polishing machining based on the frequent low-strength low-speed cutting by the abrasive grain of turbulent flow to the wall of work piece is good for the mirror finishing, because the random of the cutting direction eliminates the direction tendency of surface veins. 3) Abrasive grains are restricted by the flow passage. They hit the surface again and again. The processing efficiency is availability improved. In this paper introduced:1) The research meaning of the mould structural surface polishing processing based on flexible liquid-solid two phase abrasive flow is introduced. The research situation at home or abroad is gathered up. And the mould structural surface polishing processing based on flexible liquid-solid two phase abrasive flow is brought forward while the principle of this method is analyzed. Based on the principle, the experiment platform and the restricted module are designed and processed.2) Then the control equation is given. Design the rectangle path in the restricted module while a series of Fluent emulation the rectangle paths and the pipes are worked out, including the analyze of the pressure field, the emulation of the speed field and the numerical simulation of different flow passage. The abrasive grains are dynamics analyzed systematic.3) Finally, a series of proof experiments are done using the platform and restricted module which shows the principle of this method is right and the polishing processing method is useful. 9 groups of technologic experiments based on the orthogonal experiments method are done. Working on the results of these experiments, the curve charts showing the influences of the top system impulse pressure P, the polishing time T, and the flow rate qv to the processing effect are worked out. The influence level of the 3 elements to the effect of polishing goes to: the top system impulse pressure P> the polishing time T> the flow rate qv. From assembling the best experiment condition shows: the larger top system impulse pressure, the longer polishing time and the bigger flow rate, the better experiment result. The experience formula is worked out.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Cutting tools, abrasives,abrasive tools,fixtures,molds and hand tools > Mold
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