本文選題：多晶立方氮化硼 + 高頻感應釬焊�。� 參考：《南京航空航天大學》2017年碩士論文

【摘要】：多晶立方氮化硼(Polycrystalline cubic boron nitride,簡稱PCBN)磨粒是以微晶立方氮化硼(CBN)顆粒為原料,加入氮化鋁(AlN)粘結劑,在高溫高壓下燒結而成的聚晶磨粒材料。多晶立方氮化硼磨粒保持了單晶CBN磨粒的優(yōu)異耐磨性能,并且可以通過微破碎自銳效應使磨粒在磨削過程中始終具有鋒利的微切削刃,以此克服普通單晶磨粒磨鈍后砂輪鋒利度難以保持的現(xiàn)象。高頻感應釬焊技術加熱效率高,砂輪基體變形小,是實現(xiàn)超硬磨料與砂輪基體高強度結合的有效渠道,特別是在制作大尺寸、高精度釬焊超硬磨粒砂輪方面具有廣闊應用前景。有鑒于此,本文提出選用PCBN磨粒制作單層感應釬焊砂輪,探索砂輪制備機理,評價砂輪的磨削性能,研究砂輪的磨損特性。研究成果對于多晶CBN砂輪的研制及其在難加工材料磨削加工中的應用具有重要意義。本文完成的研究工作與取得的成果主要包括:(1)在不同感應釬焊參數(shù)下實現(xiàn)了Ag-Cu-Ti粉末、PCBN磨粒與45鋼的釬焊連接,分析了PCBN磨粒釬焊界面微結構、表面生成物形貌及物相,對比了焊后磨粒的強度,優(yōu)選了釬焊參數(shù)范圍:感應電流為20-24A、掃描速度為0.5-1mm/s。(2)制作了單層感應釬焊PCBN砂輪,進行了高溫合金GH4169的磨削試驗,對比研究了不同磨削用量下磨削力、磨削溫度、磨削功率及比能的變化規(guī)律。研究發(fā)現(xiàn),單層PCBN砂輪具有優(yōu)異的磨削性能,并且磨削力等特征參量隨磨削用量的變化呈現(xiàn)出一定規(guī)律變化。(3)進行了單層釬焊PCBN砂輪磨損試驗,研究了砂輪的主要磨損形式及磨粒形貌、磨粒磨損高度以及磨削力等特征參量隨磨削過程的演變規(guī)律,發(fā)現(xiàn)PCBN磨粒的自銳行為可使砂輪鋒利度長時保持在穩(wěn)定的水平。
[Abstract]:Polycrystalline cubic boron nitride cubic boron nitrides (PCBNs) are polycrystalline abrasive materials sintered under high temperature and high pressure by adding aluminum nitride (AlN) binder with cubic boron nitride (CBN) particles as raw materials.Polycrystalline cubic boron nitride abrasive particles maintain the excellent wear resistance of single crystal CBN abrasive particles, and the abrasive particles can always have sharp micro-cutting edge in grinding process by micro-crushing self-sharpening effect.In this way, the sharpness of grinding wheel is difficult to be maintained after bluntness of single crystal abrasive grinding.High frequency induction brazing technology has high heating efficiency and low deformation of grinding wheel matrix. It is an effective channel to realize the high strength combination of superhard abrasive and grinding wheel matrix, especially in making large size and high precision brazing super hard abrasive grinding wheel.In view of this, this paper proposes to use PCBN abrasive particles to make single-layer induction brazing grinding wheel, to explore the mechanism of grinding wheel preparation, to evaluate the grinding performance of grinding wheel, and to study the wear characteristics of grinding wheel.The research results are of great significance for the development of polycrystalline CBN grinding wheel and its application in the grinding of difficult-machined materials.The research work and the results obtained in this paper mainly include: (1) the brazing connection between Ag-Cu-Ti powder and 45 steel was realized under different parameters of induction brazing. The microstructure of PCBN abrasive soldering interface, the morphology and phase of the surface product were analyzed.The strength of abrasive particles after welding is compared, and the brazing parameter range is chosen as follows: induction current is 20-24A, scanning speed is 0.5-1mm / s 路s. 2) single layer induction brazing PCBN grinding wheel has been made. Grinding test of superalloy GH4169 has been carried out, and grinding force under different grinding contents has been comparatively studied.Variation of grinding temperature, grinding power and specific energy.It is found that the monolayer PCBN grinding wheel has excellent grinding performance, and the grinding force and other characteristic parameters show a certain regularity with the change of grinding content. The wear tests of single-layer brazed PCBN grinding wheel are carried out.The evolution law of grinding wheel's main wear form, abrasive particle morphology, abrasive wear height and grinding force with grinding process is studied. It is found that the self-sharpening behavior of PCBN abrasive particles can keep the grinding wheel at a stable level when the sharpness of grinding wheel is long.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG743

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本文編號：1745351