本文選題：金剛石微粉　切入點(diǎn)：化學(xué)鍍　出處：《南京航空航天大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：固結(jié)磨料研磨技術(shù)具有綠色環(huán)保、加工成本低和加工效率高等特點(diǎn),是近年來(lái)迅速發(fā)展起來(lái)的一種研磨加工新工藝。金剛石磨粒是固結(jié)磨料研磨的常用磨料,但是由于金剛石顆粒在加工過(guò)程中易脫落,利用率大大降低;在金剛石磨粒表面鍍鎳可以提高樹脂基體對(duì)磨粒的把持能力,進(jìn)而提高金剛石的利用率。本文通過(guò)化學(xué)鍍鎳的方法,在金剛石微粉表面鍍覆一層Ni-P合金層;并使用鍍鎳金剛石微粉制備了固結(jié)磨料研磨墊,通過(guò)連續(xù)研磨實(shí)驗(yàn)和相關(guān)測(cè)試系統(tǒng)對(duì)金剛石形貌及其加工性能進(jìn)行了評(píng)價(jià)。主要研究?jī)?nèi)容和結(jié)果如下:(1)研究了絡(luò)合劑及還原劑對(duì)鍍層P含量及包覆率的影響,并通過(guò)SEM觀察了不同P含量下金剛石顆粒的微觀形貌。結(jié)果表明:同等條件下,絡(luò)合劑的絡(luò)合能力越強(qiáng)鍍層P含量越高,還原劑含量越高鍍層P含量越高;絡(luò)合劑絡(luò)合能力越強(qiáng)鍍層包覆率越低,還原劑含量越高鍍層包覆率越高;鍍覆后金剛石顆粒的表面粗糙度隨著P含量的上升而增大。(2)探索了不同鍍層P含量金剛石在固結(jié)磨料墊中的加工特性,對(duì)比了不同研磨墊加工過(guò)程中的摩擦系數(shù)、聲發(fā)射信號(hào)、材料去除率、工件表面質(zhì)量以及加工后研磨墊的磨損量;并與電鍍金剛石進(jìn)行了對(duì)比。結(jié)果表明:研磨過(guò)程中的摩擦系數(shù)、材料去除速率和工件表面粗糙度隨著P含量的增加呈先增大后減小的趨勢(shì);中磷鍍層金剛石研磨墊的加工效率及其穩(wěn)定性最好,連續(xù)加工50 min后材料去除速率為6.4μm/min,保持度為58.8%,約為低磷金剛石保持度的1.2倍;研磨后研磨墊的磨損量隨著P含量的增大而降低;電鍍金剛石表面粗糙度及加工性能均介于低磷與中磷鍍層金剛石之間。(3)不同研磨階段的金剛石在研磨過(guò)程中的受力與接觸狀態(tài)存在較大的差異,分別對(duì)兩種不同粒徑的金剛石表面鎳覆量進(jìn)行了優(yōu)化,并進(jìn)行了對(duì)比。結(jié)果表明:粗研過(guò)程使用的粗粒徑金剛石在研磨過(guò)程中的受力及對(duì)磨粒把持力的要求均高于細(xì)粒徑的精研金剛石,所以對(duì)鍍層表面粗糙度的要求也高于精研金剛石;在研磨K9玻璃過(guò)程中40-50μm的金剛石在包覆率50%時(shí)研磨效率達(dá)到最大值,20-30μm的金剛石在包覆率30%時(shí)研磨效率達(dá)到最大值。
[Abstract]:The technology of consolidated abrasive grinding has the characteristics of green environmental protection, low processing cost and high processing efficiency. It is a new grinding technology developed rapidly in recent years. However, diamond particles are easy to fall off in the process of processing, and the utilization ratio is greatly reduced. Nickel plating on the surface of diamond abrasive particles can improve the ability of resin matrix to control the abrasive particles. In this paper, a layer of Ni-P alloy layer was coated on the surface of diamond powder by electroless nickel plating, and a cemented abrasive grinding pad was prepared using nickel coated diamond powder. The morphology and processability of diamond were evaluated by continuous grinding experiment and related testing system. The main research contents and results were as follows: 1) the effects of complexing agent and reducing agent on P content and coating rate were studied. The microcosmic morphology of diamond particles with different P content was observed by SEM. The results showed that the stronger the complexing ability of the complexing agent was, the higher the P content of the coating was, and the higher the P content of the coating was, the higher the content of reducing agent was, the higher the P content of the coating was. The stronger the complexing ability of the complex agent is, the lower the coating coating is, and the higher the content of reducing agent is, the higher the coating coating rate is. The surface roughness of coated diamond particles increases with the increase of P content.) the processing characteristics of diamond coated with different P content in consolidation abrasive pad are explored, and the friction coefficient and acoustic emission signal of different abrasive mats are compared. The material removal rate, the surface quality of workpiece and the wear amount of abrasive pad after finishing are compared with those of electroplated diamond. The results show that the friction coefficient in the grinding process, The material removal rate and workpiece surface roughness increased first and then decreased with the increase of P content, and the processing efficiency and stability of medium phosphorus coated diamond lapping pad were the best. After 50 min of continuous processing, the material removal rate was 6.4 渭 m / min, and the retention was 58.8, about 1.2 times of the retention of low phosphorus diamond, and the wear rate of grinding pad decreased with the increase of P content. The surface roughness and processability of electroplated diamond are between low phosphorus and medium phosphorus coated diamond. The nickel coating on diamond surface with two different diameters was optimized. The results show that the force and holding force of rough diamond in grinding process are higher than those in fine grain grinding process. Therefore, the surface roughness of the coating is higher than that of fine grinding diamond, and the grinding efficiency of 40-50 渭 m diamond in K9 glass grinding process reaches the maximum when the coating rate is 50 渭 m and the grinding efficiency of diamond with 20-30 渭 m coating ratio reaches the maximum when the coating rate is 30 渭 m.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ163;TB306

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