經由本論文實驗後，線放電切割加工方面，證實磷加工液可以有效使放電過程中的放電能量增強與導電度提升，可以在不改變現有加工參數的條件下，提升切割速度與降低切口損失。電解磨削表面加工方面，加入石墨烯材料後，可有效改善放電加工後殘留之表面問題並減少加工時的摩擦力進而提升磨削刀具壽命。期望藉由本論文之研究成果作為產學界研究之參考。;Nowadays, the researches and developments of renewable energy have become the universal consensus. Among them, the developments of solar cell attract the greatest attention. In the process of making solar cell, the cutting process of silicon ingot is the key to determine the cost. Multi-wire saw has been used in the traditional cutting to conduct machining process. Its advantage is to multi-wire-type processing, which heighten the processing efficiency. However, multi wire requires great tension and produces stress that could easily damage the silicon ingot. In addition, during the process, abrasive could not be used completely. The complicated recycle processes of abrasive contaminate the environment. Thus, in recent years, related research proposed in the literature, by using wire electrical discharge machining (WEDM) cutting silicon ingot, this method can effectively improve the shortcomings multi-wire saw. WEDM has been applied onto the single-crystal silicon cutting. Most researches adopted single-crystal silicon as the process material. However, it is hard to find a literature review on the machining characteristics of a polycrystalline silicon surface and the quality improvements after processing. The main reasons of polycrystalline silicon are changing boundaries, high electrical resistance and other characteristics, which lead WEDM can not be process smoothly. Polycrystalline silicon manufacturing process is simple, lower cost, stable photoelectric efficiency and other advantages. Therefore, a new method to improve the polycrystalline silicon processing problems needs to be developed.
This thesis adopts machining characteristics of polycrystalline silicon research by WEDM and electrochemical grinding (ECG) these two methods. This paper divided into two research directions. The first part discusses when the polycrystalline silicon by using WEDM processing, the impact of discharge parameters on the polycrystalline silicon and the adjustments of phosphorous dielectric improve its processing efficiency and processing characteristics. The second part is the application of ECG surface defects after WEDM be grinded, it improves the removal of surface roughness and affected layer by using Taguchi-method experiment planning, the main factor affects the analysis process to get through. Follow added graphene in dielectric. By using the high hardness and high lubricity of graphene to improve processing characteristics of the original surface and explore the impact of process parameters for the processing.
After the experiments by this thesis, it is sure that in the WEDM processing, phosphorous dielectric improves the discharge process effectively and makes the discharge energy booster to enhance conductivity. Under the no-changing existed processing parameters condition, it improves the cutting speed and reduces kerf loss. In the ECG processing, by adding graphene, the surface problems effectively improved after WEDM machining residues and reduce friction force during processing and it enhances the grinding tool life. It is expected the results of this thesis could be referenced for the future research in both industrials and academic field.