本文選題：陶瓷刀具 + 干切削�。� 參考：《山東大學(xué)》2016年博士論文

【摘要】：本文提出了多尺度表面織構(gòu)陶瓷刀具的設(shè)計(jì)概念和設(shè)計(jì)思路,通過對陶瓷刀具材料表面微織構(gòu)和納織構(gòu)的制備工藝研究,結(jié)合固體潤滑技術(shù),成功制備出多尺度表面織構(gòu)陶瓷刀具,系統(tǒng)研究了多尺度表面織構(gòu)陶瓷刀具的摩擦磨損特性及切削性能,分析并揭示了該刀具的減摩作用機(jī)理。分析了采用納秒激光和飛秒激光在陶瓷刀具材料表面誘導(dǎo)微織構(gòu)和納織構(gòu)的形成機(jī)制；同時(shí)建立了織構(gòu)表面與光滑平面接觸的靜態(tài)模型,從理論上分析了表面織構(gòu)在摩擦接觸過程中的減摩機(jī)理和表面織構(gòu)刀具對切削力和切削溫度的影響。分析表明,表面織構(gòu)能夠有效地減小實(shí)際接觸面積,從而減小接觸界面的摩擦,降低表面的摩擦接觸溫度。表面織構(gòu)刀具能夠有效地降低切削過程中的切削力和切削溫度。提出了多尺度表面織構(gòu)陶瓷刀具的設(shè)計(jì)概念和設(shè)計(jì)思路,研究了多尺度表面織構(gòu)陶瓷刀具的制備方法和制備工藝。通過開展納秒激光和飛秒激光在陶瓷刀具材料表面加工微織構(gòu)與納織構(gòu)的工藝試驗(yàn),優(yōu)化得到最佳的微織構(gòu)和納織構(gòu)激光加工工藝參數(shù)。采用納秒激光制備微織構(gòu)的最佳工藝參數(shù)為：泵浦電壓為19.5 V,掃描速度為5 mm/s,重復(fù)頻率為6 kHz,掃描1遍；對應(yīng)的微織構(gòu)寬度約為50μm,深度約為43μm。采用飛秒激光制備納織構(gòu)的最佳的工藝參數(shù)為：能量為1.75μJ,掃描速度為500μm/s,掃描1遍；對應(yīng)的納織構(gòu)周期約為750 nnm,深度約為150 nm。采用最佳激光加工參數(shù)同時(shí)結(jié)合固體潤滑技術(shù)制備出了多尺度表面織構(gòu)陶瓷刀具。通過摩擦磨損試驗(yàn)對微織構(gòu)陶瓷刀具材料表面摩擦磨損特性進(jìn)行了研究。結(jié)果表明,干摩擦條件下,微織構(gòu)試樣(AT)增大了摩擦系數(shù)和摩擦溫度,但減小了表面的磨粒磨損和粘結(jié)。微織構(gòu)與固體潤滑技術(shù)協(xié)同作用(AT-W)能夠有效地減小摩擦系數(shù)、摩擦溫度和表面的磨損與粘結(jié)；與未織構(gòu)表面試樣(AS)相比,其摩擦系數(shù)降低了70-80%,摩擦溫度降低了40-50%。這主要是由于摩擦作用引起了微織構(gòu)內(nèi)部固體潤滑劑轉(zhuǎn)移到摩擦接觸界面形成潤滑膜,從而有效地減小了摩擦,降低了摩擦溫度；同時(shí),微織構(gòu)能夠有效地收集磨屑,減少表面的磨粒磨損和粘結(jié)。通過摩擦磨損試驗(yàn)對納織構(gòu)陶瓷刀具材料表面摩擦磨損特性進(jìn)行了研究。結(jié)果表明,納織構(gòu)試樣(TS)相比未織構(gòu)試樣(SS)能夠有效地減小表面摩擦和粘結(jié),其摩擦系數(shù)降低了6-13%。納織構(gòu)涂層試樣(TCS)減摩效果最為明顯,與未織構(gòu)涂層試樣(SCS)和未織構(gòu)試樣(SS)相比,TCS試樣摩擦系數(shù)分別降低了16-38%和85-93%。分析了TCS試樣減摩潤滑機(jī)理：一方面,納織構(gòu)提高了涂層與基體的結(jié)合強(qiáng)度,延長了涂層的磨損壽命。另一方面,納織構(gòu)能夠存儲(chǔ)固體潤滑涂層,摩擦過程中,納織構(gòu)中的潤滑涂層在摩擦擠壓作用下,有效地轉(zhuǎn)移到摩擦接觸界面,形成連續(xù)的潤滑薄膜,從而減小了摩擦與粘結(jié)。研究了未織構(gòu)陶瓷刀具(AS)、未織構(gòu)表面涂層陶瓷刀具(AS-L)、納織構(gòu)涂層陶瓷刀具(AN-L)和多尺度表面織構(gòu)涂層陶瓷刀具(AT-L)干切削45淬火鋼時(shí)的切削性能。結(jié)果表明,AT-L刀具能夠最有效地改善刀具的切削性能。與AS刀具相比,AT-L刀具三向切削力降低了25-40%,切削溫度降低了10-20%；前刀面刀-屑接觸區(qū)平均摩擦系數(shù)降低了17-22%,刀-屑接觸長度減小了8-17%,刀-屑接觸區(qū)平均切應(yīng)力減小了11-13%,但其刀尖正應(yīng)力和刀-屑接觸區(qū)平均正應(yīng)力增大了7-11%。在切削速度為200 m/min時(shí),AT-L刀具壽命與AS刀具相比提高了14.7%。揭示了AT-L刀具切削過程中的減摩機(jī)理。切削過程中,AT-L刀具能夠在刀-屑接觸界面形成一層潤滑薄膜,從而減小刀-屑接觸界面間的摩擦。微納織構(gòu)的存在能夠有效地減小刀-屑接觸長度,降低粘結(jié)區(qū)長度占總刀-屑接觸長度的比例。同時(shí)納織構(gòu)增加了涂層與基體的結(jié)合強(qiáng)度,微織構(gòu)能夠收集磨屑和磨損掉的潤滑涂層,進(jìn)而能夠減小前刀面磨粒磨損和提供二次潤滑作用。因此,AT-L刀具能夠有效地減小摩擦與磨損是固體潤滑劑、微織構(gòu)與納織構(gòu)共同作用的結(jié)果。
[Abstract]:In this paper, the design concept and design ideas of multi-scale surface textured ceramic tools are proposed. Through the study of the micro texture and the preparation of the nanoscale on the surface of the ceramic tool materials and the solid lubrication technology, the multi scale surface textured ceramic tools are prepared successfully. The friction and wear characteristics of the multi-scale surface textured ceramic tools are systematically studied. The mechanism of the friction reduction of the cutting tool is analyzed and revealed. The formation mechanism of the micro texture and the texture of the nanosecond laser and femtosecond laser on the surface of the ceramic tool material is analyzed, and the static model of the contact between the texture surface and the smooth plane is established, and the friction contact process of the surface texture is analyzed theoretically. The mechanism of friction reduction and the influence of the surface texture tool on the cutting force and the cutting temperature. The analysis shows that the surface texture can effectively reduce the actual contact area, thus reduce the friction of the contact interface and reduce the friction contact temperature of the surface. The surface texture tool can effectively reduce the cutting force and the cutting temperature during the cutting process. The design concept and design ideas of multi-scale surface textured ceramic tools are designed. The preparation and preparation techniques of multi-scale surface textured ceramic tools are studied. The optimum microtexture and nanoscale laser are optimized by the process experiments of nanosecond laser and femtosecond laser on the machining of micro texture and texture on the surface of ceramic tool materials. The optimum parameters of micro texture by nanosecond laser are: the pump voltage is 19.5 V, the scanning speed is 5 mm/s, the repetition rate is 6 kHz, the scanning is 1 times. The corresponding micro texture width is about 50 mu m and the depth is about 43 u M. to prepare the nanosecond texture by the femtosecond laser. The energy is 1.75 um J, scanning. The velocity is 500 mu m/s and scanning 1 times; the corresponding nanoscale period is about 750 NNM, the depth is about 150 nm., and the multi-scale surface textured ceramic tool is prepared by using the best laser processing parameters and solid lubrication technology. The friction and wear characteristics of the micro texture ceramic tool material surface are studied by friction and wear test. Under dry friction conditions, the micro texture sample (AT) increases the friction coefficient and the friction temperature, but reduces the abrasive wear and bonding of the surface. The synergistic effect of micro texture and solid lubrication (AT-W) can effectively reduce the friction coefficient, the friction temperature and the wear and bond of the surface. Compared with the non textured surface sample (AS), the friction coefficient decreases. Low 70-80%, the friction temperature decreases 40-50%., which is mainly due to the friction caused by the transfer of the solid lubricant inside the micro texture to the friction contact interface to form a lubricating film, which effectively reduces friction and reduces the friction temperature. At the same time, the micro texture can effectively collect the debris and reduce the wear and adhesion of the surface. The friction and wear properties of nano textured ceramic tool materials were studied by friction and wear tests. The results showed that the nano texture specimen (TS) could reduce the surface friction and adhesion effectively compared with the untextured specimen (SS), and the friction coefficient reduced the most obvious effect of the 6-13%. nano textured coating sample (TCS), and the untextured coating sample (SCS) and the untextured coating sample (SCS). Compared with SS, the friction coefficient of TCS samples decreased by 16-38% and 85-93%. respectively. The friction reduction mechanism of TCS samples was analyzed. On the one hand, the nano texture enhanced the bonding strength of the coating and the matrix and extended the wear life of the coating. On the other hand, the nano texture could store the solid lubrication coating, and the lubrication in the nano texture during the friction process. Under friction extrusion, the coating is effectively transferred to the friction contact interface to form a continuous lubricating film, thus reducing friction and bonding. The non woven ceramic tool (AS), the non woven surface coated ceramic tool (AS-L), the nanoscale coated ceramic tool (AN-L) and the multi scale surface textured ceramic tool (AT-L) dry cutting are 45 Quenched. The cutting performance of fire steel shows that AT-L tool can improve cutting performance most effectively. Compared with AS tool, AT-L tool three reduces cutting force by 25-40%, cutting temperature decreases 10-20%, the average friction coefficient of knife chip contact area decreases 17-22%, knife chip contact length decreases 8-17%, tool chip contact area averages The shear stress is reduced by 11-13%, but the average stress of the tip positive stress and the knife chip contact area increases 7-11%. at the cutting speed of 200 m/min, and the lifetime of the AT-L cutter is improved by 14.7%. to reveal the mechanism of the friction reduction in the cutting process of the AT-L tool. In the cutting process, the AT-L knife can form a layer of lubrication in the interface of the knife chip contact. The film, thus reducing the friction between the contact interface of the knife chip, can effectively reduce the length of the knife chip contact and reduce the length of the bond area to the length of the total chip contact. At the same time, the texture of the nano texture increases the bonding strength of the coating and the matrix, and the micro texture can collect the wear debris and wear the lubricating coating, and then reduce the length of the coating. The knife surface is abrasive and provides two lubrication. Therefore, AT-L tools can effectively reduce friction and wear as a result of the interaction of solid lubricants, micro texture and texture.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TG711

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本文編號：1977615