本文選題：GH4169　切入點：PCBN刀具　出處：《哈爾濱理工大學(xué)》2016年碩士論文

【摘要】：鎳基高溫合金GH4169是典型的難加工材料,切削加工中材料的塑性變形引起的塑性側(cè)流現(xiàn)象對已加工表面粗糙度、刀具使用性能及壽命等都有較大影響,PCBN作為一種超硬刀具在加工高溫合金方面具有較大潛能,因此通過研究切削參數(shù)及PCBN刀具幾何參數(shù)對加工高溫合金產(chǎn)生的影響,對推進(jìn)PCBN刀具的應(yīng)用具有重要的意義,本文通過PCBN刀具直角自由切削鎳基高溫合金GH4169,探究切削參數(shù)、PCBN負(fù)倒棱角度和切屑形成及其影響因素對切削力及表面粗糙度的影響規(guī)律。首先,進(jìn)行PCBN刀具直角切削鎳基高溫合金GH4169試驗,通過幾何參數(shù)刀具單因素試驗分析出負(fù)倒棱角度影響切削力的變化關(guān)系。根據(jù)正交試驗利用極差、方差分析獲取切削參數(shù)對切削力的影響規(guī)律,基于試驗結(jié)果進(jìn)行多元線性回歸分析,建立切削力經(jīng)驗預(yù)測模型。其次,重點對切削過程中切屑側(cè)流現(xiàn)象進(jìn)行研究,分析切屑側(cè)流的影響因素及切屑側(cè)流的產(chǎn)生對刀具磨損的影響,研究發(fā)現(xiàn):切屑寬度增加與進(jìn)給量及負(fù)倒棱角度增加成正比,與切削速度增加成反比,切屑寬度增加越多,切屑側(cè)流也就越明顯,毛刺尺寸也就越大。探究切削參數(shù)對切屑宏觀形態(tài)和切屑微觀形態(tài)(切屑厚度、齒高和齒間角)的影響規(guī)律。然后,根據(jù)單因素試驗的數(shù)據(jù)結(jié)果,建立表面粗糙度的二階響應(yīng)曲面預(yù)測模型,對切削參數(shù)因素及交互作用進(jìn)行響應(yīng)曲面分析,根據(jù)試驗數(shù)據(jù)驗證了系統(tǒng)預(yù)測的誤差在9%以內(nèi),具有一定的精度,以表面粗糙度為加工目標(biāo),進(jìn)行加工工藝優(yōu)化,來實現(xiàn)提高運行效率、降低生產(chǎn)成本的目的。最后,利用Third Wave Advant Edge有限元仿真軟件,對鎳基高溫合金GH4169切削過程微觀塑性變形進(jìn)行仿真,分析負(fù)倒棱角度、切削參數(shù)變化對切削溫度、切屑形態(tài)、等效應(yīng)力及剪切角的影響規(guī)律,并通過塑性應(yīng)變速率等指標(biāo)反映材料金屬在切削中塑性側(cè)流現(xiàn)象。
[Abstract]:Nickel base superalloy (GH4169) is a typical difficult to be machined material. The plastic side flow caused by plastic deformation of the material in cutting process has a good effect on the roughness of the machined surface.As a super hard tool, PCBNs have great potential in machining superalloys. Therefore, the effects of cutting parameters and PCBN tool geometry parameters on the processing of superalloys are studied.It is of great significance to advance the application of PCBN cutting tools. In this paper, the cutting parameters, negative chamfering angle, chip formation and their influence factors on cutting force and surface roughness are investigated by PCBN tool free cutting of Ni-base superalloy GH4169 at right angle.First of all, the GH4169 test of cutting nickel base superalloy with PCBN tool at right angle was carried out. The change of cutting force was analyzed by single factor test of geometric parameter cutting tool.The influence of cutting parameters on cutting force was obtained by means of range and variance analysis in orthogonal experiments. Based on the experimental results, a multivariate linear regression analysis was carried out, and an empirical prediction model of cutting force was established.Secondly, the phenomenon of chip side flow in cutting process is studied. The influence factors of chip side flow and the influence of chip side flow on tool wear are analyzed. It is found that the increase of chip width is directly proportional to the increase of feed rate and negative inverted angle.The more the chip width increases, the more obvious the chip side flow is and the bigger the burr size is, the inversely proportional to the cutting speed.The effects of cutting parameters on chip macro morphology and chip micro morphology (chip thickness, tooth height and angle between teeth) were investigated.Then, according to the data of single factor test, the second order response surface prediction model of surface roughness is established, and the response surface analysis of cutting parameters and interaction is carried out. According to the experimental data, the error of the system prediction is less than 9%.It has certain precision, takes the surface roughness as the processing target, carries on the processing craft optimization, to achieve the purpose of improving the operation efficiency and reducing the production cost.Finally, Third Wave Advant Edge finite element simulation software is used to simulate the micro-plastic deformation in the process of GH4169 cutting of Ni-base superalloy. The negative inverted angle, the change of cutting parameters to the cutting temperature and chip shape are analyzed.The effect of equivalent stress and shear angle on the plastic lateral flow in cutting is reflected by plastic strain rate.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG506

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本文編號：1691762