本文關鍵詞： 高壓冷卻 PCBN刀具 切屑折斷 高溫合金　出處：《機械工程學報》2017年09期 　論文類型：期刊論文

【摘要】：高溫合金廣泛應用于航空航天領域,是一種典型的難加工材料,切削過程中切屑纏繞工件及刀具、不易折斷,從而降低刀具壽命和已加工表面質(zhì)量。PCBN是超硬刀具材料,加工高溫合金等高溫高強度鋼性能優(yōu)異,但由于刀具材料特性通常采用平前刀面,因此切削過程中斷屑比較困難。高壓冷卻是金屬高效切削加工中一種新型加工技術,可以有效改善斷屑性能、提升斷屑能力、提高刀具壽命和加工表面質(zhì)量。目前對高壓冷卻斷屑機理研究較少,且高壓冷卻切削仿真不易實現(xiàn),為充分研究高壓冷卻下高溫合金切削加工中的切屑折斷機理,通過建立切屑卷曲半徑預測模型和斷屑模型,進行高壓冷卻下切屑折斷機理研究,主要通過在高壓冷卻下,對PCBN刀具切削鎳基高溫合金進行試驗研究,研究不同冷卻液壓力下切屑卷曲半徑變化規(guī)律,對理論分析結(jié)果進行驗證。研究結(jié)果表明:在高壓冷卻加工中由于高壓冷卻液的存在,切屑受到附加冷卻液壓力影響,使彎矩發(fā)生變化,造成切屑卷曲半徑減小,最終導致切屑應變增大、切屑易于折斷;且由于卷曲半徑的改變使極限進給量和極限背吃刀量降低,使高壓冷卻加工改善斷屑性能的效果非常明顯。上述研究成果為實現(xiàn)高溫合金高壓冷卻條件下的切削加工奠定了理論基礎。
[Abstract]:High temperature alloy is widely used in aerospace field. It is a kind of typical difficult to be machined material. Chip winding workpiece and cutting tool is not easy to break in cutting process, thus reducing tool life and machined surface quality. PCBN is super hard tool material. High temperature and high strength steels such as superalloy have excellent properties, but the cutting tool materials are usually flat front face, so it is difficult to break chips in the cutting process. High pressure cooling is a new processing technology in metal high efficiency cutting. It can effectively improve chip breaking performance, improve chip breaking ability, improve tool life and machining surface quality. At present, there are few researches on the mechanism of high pressure cooling chip breaking, and the simulation of high pressure cooling cutting is not easy to realize. In order to fully study the chip breaking mechanism in high pressure cooling superalloy cutting, the chip breaking mechanism is studied by establishing the prediction model of chip crimp radius and chip breaking model, and the chip breaking mechanism is studied under high pressure cooling, mainly by means of high pressure cooling. The experimental study on cutting nickel base superalloy with PCBN cutter was carried out to study the variation of chip crimp radius under different coolant pressure. The theoretical analysis results are verified. The results show that the chip is affected by the additional coolant pressure in high pressure cooling process, which results in the change of bending moment and the decrease of chip crimp radius. As a result, the strain of chip increases and the chip is easily broken, and because of the change of crimp radius, the limit feed and the amount of knife are reduced. The effect of high pressure cooling process on improving chip breaking performance is very obvious. The above research results lay a theoretical foundation for the realization of high pressure cooling of superalloy cutting.
【作者單位】： 哈爾濱理工大學機械動力工程學院;
【基金】：國家自然科學基金(51475128) 黑龍江省自然科學基金(E2016043)資助項目
【分類號】：TG132.3

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本文編號：1500690