本文選題：表面微織構(gòu) + 硬質(zhì)合金刀具　； 參考：《湖南科技大學(xué)》2017年碩士論文

【摘要】：由于切削液的使用對環(huán)境和操作工人產(chǎn)生危害,使得干切削的應(yīng)用越來越廣泛,但干切削導(dǎo)致劇烈地摩擦和粘附,使刀具壽命降低,并影響加工質(zhì)量。具有一定表面微觀結(jié)構(gòu)的非光滑摩擦表面(表面織構(gòu))往往具有更小的摩擦力,將表面織構(gòu)應(yīng)用于刀具切削過程中,可以實現(xiàn)刀具的減摩抗磨,但其對干切削過程的影響機理仍不清楚。為了提高刀具切削性能,本文從探究表面微織構(gòu)影響干切削過程的機理出發(fā),綜合運用力學(xué)、材料學(xué)、現(xiàn)代切削理論,結(jié)合有限元分析和切削實驗,對表面微織構(gòu)刀具的設(shè)計、制備和切削性能等方面開展研究工作。論文主要研究內(nèi)容如下:(1)對無織構(gòu)和微織構(gòu)刀具非自由斜角切削45鋼的過程進行有限元分析,對比分析了MT-0、MT-45、MT-90和MT-135刀具的切削力、切削溫度和刀具應(yīng)力,結(jié)果表明微織構(gòu)的存在改變了刀具的切削溫度和應(yīng)力分布;研究了不同寬度、深度和間距的微織構(gòu)對刀具的切削溫度和應(yīng)力的影響,分析了切削速度、進給量和背吃刀量對微織構(gòu)刀具切削溫度和應(yīng)力的影響;研究了微織構(gòu)引起的“二次切削”現(xiàn)象,結(jié)果表明較小的微織構(gòu)寬深比可避免此現(xiàn)象的產(chǎn)生。(2)采用激光加工技術(shù)制備出MT-0、MT-45、MT-90和MT-135刀具,將其后處理并對其形貌進行檢測。開展了微織構(gòu)刀具的干切削實驗,分析了微織構(gòu)形態(tài)對刀具三向切削力、前刀面平均摩擦系數(shù)、前刀面形貌的影響,研究了無織構(gòu)刀具和MT-135刀具的切削力和前刀面平均摩擦系數(shù)隨微織構(gòu)深度和間距、切削速度、進給量和背吃刀量的變化。(3)研究了微織構(gòu)形態(tài)對切屑形貌的影響,對其形成過程及卷曲方式進行分析,探討了微織構(gòu)刀具的切屑形成機理,揭示了表面微織構(gòu)影響干切削過程的機理。在切削過程中,微織構(gòu)減小了刀-屑實際接觸長度,有利于降低切削力和切削溫度;微織構(gòu)可以存儲刀-屑摩擦界面的碎屑,減小犁溝效應(yīng),從而減小摩擦和刀具磨損。
[Abstract]:Because the use of cutting fluid is harmful to environment and operation workers, dry cutting is more and more widely used, but dry cutting leads to severe friction and adhesion, reduces tool life and affects machining quality. The non-smooth friction surface (surface texture) with certain surface microstructure often has smaller friction force. Applying surface texture to cutting process of cutting tool can realize anti-friction and anti-wear of cutting tool. However, the mechanism of its influence on the dry cutting process is still unclear. In order to improve the cutting performance of the cutting tool, this paper discusses the mechanism of the influence of surface microtexture on the dry cutting process, and synthetically applies mechanics, material science, modern cutting theory, combined with finite element analysis and cutting experiment, to design the surface microtexture tool. Research work on preparation and cutting performance has been carried out. The main contents of this paper are as follows: (1) finite element analysis is carried out on the process of cutting 45 steel with non-free oblique angle of non-texture and micro-texture cutting tools, and the cutting force, cutting temperature and tool stress of MT-0O MT-45MT-90 and MT-135 tools are compared and analyzed. The results show that the existence of microtexture changes the cutting temperature and stress distribution of the tool, the influence of different width, depth and spacing on the cutting temperature and stress is studied, and the cutting speed is analyzed. The effects of feed rate and back feed on the cutting temperature and stress of microtexture cutter are studied, and the phenomenon of "secondary cutting" caused by microtexture is studied. The results show that the smaller aspect ratio of microtexture can avoid this phenomenon. (2) MT-0 MT-45 MT-90 and MT-135 cutters are fabricated by laser processing, and the morphology of MT-0 MT-45 MT-90 and MT-90 is examined. The dry cutting experiments of microtexture cutting tools were carried out, and the effects of microtexture shape on the cutting force, the average friction coefficient of the front cutting face and the morphology of the front tool face were analyzed. The effects of the cutting force and the average friction coefficient of the front cutting face on the microtexture depth and spacing, cutting speed, feed rate and the back feed rate of the cutting tool were studied. The influence of the microtexture morphology on the chip morphology was studied. The forming process and crimp mode of microtexture cutting tools were analyzed, and the mechanism of chip formation of microtexture cutting tools was discussed, and the mechanism of surface microtexture affecting dry cutting process was revealed. In the process of cutting, the microtexture reduces the actual contact length of the cutter and chip, which is helpful to reduce the cutting force and cutting temperature, and the microtexture can store the chips at the friction interface of the knife and chip, and reduce the ploughing effect, thus reducing the friction and tool wear.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG501

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