發(fā)布時間：2018-03-29 07:09

  本文選題：大型深型腔模具　切入點：熱縮刀桿　出處：《湘潭大學》2017年碩士論文

【摘要】：刀柄-熱縮刀桿-刀具系統(tǒng)具有結構簡單、夾持強度高、高夾持穩(wěn)定性和抗彎剛度、有較好的的回轉平衡性和易于到達工件型腔底部等特點,現(xiàn)已成為大型深型腔模具精加工和半精加工的主要方法之一。目前,關于刀柄-熱縮刀桿-刀具系統(tǒng)在實際切削過程中切削參數(shù)的研究還比較少,對其在高速切削加工時的切削性能有待深入研究。本文以P20模具鋼為高速銑削加工對象,通過正交試驗對刀柄-熱縮刀桿-刀具系統(tǒng)的加工表面粗糙度進行了研究,分析了刀具懸伸長度、主軸轉速、銑削深度、銑削寬度和每齒進給量等加工參數(shù)對工件表面粗糙度的影響。結果表明,五個參數(shù)都是高度顯著的,對P20模具鋼銑削表面粗糙度影響最大的因素是銑削寬度,然后依次是每齒進給量?z,刀具懸伸長度L,主軸轉速n和銑削深度。在正交試驗結果的基礎上,采用多元線性回歸分析方法建立了刀柄-熱縮刀桿-刀具系統(tǒng)加工表面粗糙度預測模型,并對預測模型和回歸系數(shù)進行了顯著性檢驗,結果表明所建模型高度顯著。并且對模型預測值與實際測量值進行了對比,預測誤差在1.58%-16.72%之間,具有較高的預測精度。利用有限元軟件ANSYS分析刀具懸伸長度對給定徑向力作用下熱縮刀桿節(jié)點的最大等效應力的影響;分析了在給定徑向力作用下,刀具懸伸長度對刀柄-熱縮刀桿-刀具系統(tǒng)節(jié)點的最大偏移量的影響。使用不同刀具懸伸長度的刀柄-熱縮刀桿-刀具系統(tǒng)進行高速銑削加工,研究了刀具懸伸長度對刀具磨損、高速銑削過程中銑削力以及表面粗糙度和表面形貌的影響。在相同的切削參數(shù)下,使用彈簧夾頭刀柄和熱縮刀桿A和B兩種不同型號的熱縮刀桿進行高速銑削試驗。測量三種刀具系統(tǒng)在不同銑削時間之后的刀具底刃磨損情況、銑削力的變化、工件表面粗糙度以及工件表面形貌,通過比對可以發(fā)現(xiàn),熱縮刀桿B的各項性能都優(yōu)于其他兩種夾持元件。
[Abstract]:With simple structure, high clamping strength, high clamping stability and bending stiffness, the shank-hot shrinkage cutter-tool system has the advantages of good rotation balance and easy access to the bottom of the workpiece cavity, etc. It has become one of the main methods for finishing and semi-finishing of large deep cavity die. At present, the research on cutting parameters of shank, heat shrinkage tool rod and tool system in actual cutting process is relatively few. The cutting performance of P20 die steel in high speed cutting needs to be studied deeply. In this paper, the machining surface roughness of the tool shank, heat shrinkage tool rod and tool system is studied by orthogonal test, taking P20 die steel as the object of high speed milling. The influence of cutting parameters, such as tool length, spindle speed, milling depth, milling width and feed rate per tooth, on the surface roughness of the workpiece is analyzed. The results show that the five parameters are highly significant. The most important factor affecting the surface roughness of P20 die steel milling is milling width, followed by feed quantity per tooth. Based on the results of orthogonal test, the prediction model of machining surface roughness of cutter shank, heat shrinkage tool rod and tool system is established by using multiple linear regression analysis. The results show that the model is highly significant, and the prediction error is between 1.58% and 16.72%, compared with the actual measured value, and the prediction error is between 1.58% and 16.72%, and the prediction error is between 1.58% and 16.72%, and the prediction error is between 1.58% and 16.72%. The finite element software ANSYS is used to analyze the effect of tool elongation on the maximum equivalent stress of a given radial force, and the maximum equivalent stress at a given radial force is analyzed. The influence of tool suspension elongation on the maximum offset of the node of the cutter shank-heat shrinkage cutter rod-tool system. The tool shank-heat shrinkage cutter rod-tool system with different tool length is used for high speed milling. The effects of tool elongation on tool wear, milling force, surface roughness and surface morphology during high speed milling were studied. High speed milling experiments were carried out by using two different types of hot shrinkage cutter stem A and B with spring chuck shank and heat shrinkage cutter rod. The wear of bottom edge and the change of milling force of the three cutting tool systems were measured after different milling time. The surface roughness and the surface morphology of the workpiece show that the thermal shrinkage tool rod B has better performance than the other two kinds of clamping elements.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG54

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