本文關(guān)鍵詞： 旋風(fēng)銑削 變直徑螺桿 變導(dǎo)程螺桿 變槽深螺桿　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：螺桿類零件廣泛應(yīng)用于機(jī)械、化工、石油等眾多工業(yè)領(lǐng)域中,并且在相關(guān)加工裝備中處于關(guān)鍵位置。隨著對加工原料特性及加工工藝探索的深入,更多特殊的工藝要求被提出,從而發(fā)展出各種異型螺桿。變徑變導(dǎo)程變槽深螺桿是一類其導(dǎo)程、直徑、槽深同時(shí)變化的復(fù)雜異型螺桿,其曲面變化復(fù)雜,表面質(zhì)量受到螺桿幾何參數(shù)、刀盤參數(shù)和加工參數(shù)等的綜合影響,加工難度較大。目前的研究主要集中于兩個(gè)參數(shù)同時(shí)變化的該類螺桿,且主要通過四軸及四軸以上的數(shù)控銑床進(jìn)行加工。雖然多軸機(jī)床能夠?qū)崿F(xiàn)高效高精度加工,但機(jī)床成本和復(fù)雜的工序都限制了其在國內(nèi)中小企業(yè)中的推廣。螺桿旋風(fēng)銑削是一種用裝在高速旋轉(zhuǎn)刀盤上的刀具從工件上銑削出螺紋的加工方法,分為內(nèi)切式和外切式。其中內(nèi)切式在加工過程中刀具回轉(zhuǎn)直徑大,切削速度高,刀具回轉(zhuǎn)面與工件表面接觸線相對比較長,切削更為平穩(wěn),加工件的表面光潔度更高,常用于螺桿類零件的加工。由于旋風(fēng)銑床可以由普通數(shù)控車床改造而成,造價(jià)較低,在廣大中小企業(yè)中有更好的應(yīng)用性�；谝陨蟽牲c(diǎn),本文嘗試?yán)萌S旋風(fēng)銑削技術(shù)對變徑變導(dǎo)程變槽深螺桿的加工進(jìn)行研究�；镜难芯克悸窞�:基于變直徑、變導(dǎo)程、變槽深螺桿類零件的數(shù)學(xué)模型,研究其旋風(fēng)銑削方法和理論誤差模型,為復(fù)雜異型螺桿的高效、低成本加工打下基礎(chǔ)。具體來說,首先基于螺桿成形原理建立了變徑變導(dǎo)程變槽深螺桿曲面和刀具回轉(zhuǎn)曲面的空間幾何模型;在此基礎(chǔ)上根據(jù)空間嚙合原理,推導(dǎo)出了三軸旋風(fēng)銑削空間包絡(luò)條件公式,并由此分析了三軸機(jī)床在空間包絡(luò)加工方面的局限性;建立了截面包絡(luò)法的理論誤差模型,由此優(yōu)化了截面包絡(luò)刀位點(diǎn)計(jì)算方法,并進(jìn)一步探討了刀具軌跡規(guī)劃方法。最后,在以上理論研究的基礎(chǔ)上,開發(fā)了基于UG的加工模擬系統(tǒng),并根據(jù)上文整個(gè)計(jì)算過程編制了基于MATLAB的計(jì)算模塊,對某擠壓螺桿模型進(jìn)行了實(shí)驗(yàn),驗(yàn)證了以上理論,證明了三軸旋風(fēng)銑削變徑變導(dǎo)程變槽深螺桿的可行性。
[Abstract]:Screw parts are widely used in machinery, chemical, petroleum and many other industrial fields, and in the relevant processing equipment in the key position. With the in-depth exploration of the characteristics of processing raw materials and processing technology. More special technological requirements have been put forward and various kinds of special-shaped screw have been developed. The variable-diameter variable-lead variable groove-depth screw is a kind of complex special-shaped screw whose lead diameter and groove depth change simultaneously and its curved surface change is complex. The surface quality is affected by the geometric parameters of the screw, the parameters of the cutter head and the machining parameters, and so on, so it is difficult to process. The current research is mainly focused on the two parameters of the screw changes at the same time. And mainly through four-axis and more than four axis CNC milling machine, although multi-axis machine tools can achieve high-efficiency and high-precision machining. However, the cost of machine tools and complex processes limit their promotion in small and medium-sized enterprises in China. Screw whirlwind milling is a machining method of milling threads from workpieces with a tool mounted on a high speed rotary cutter. In the process of machining, the cutting tool has large turning diameter, high cutting speed, relatively long contact line between the tool surface and the workpiece surface, and the cutting is more stable. The surface finish of the workpiece is higher, which is often used in the processing of screw parts. Because the whirlwind milling machine can be modified by the general numerical control lathe, the cost is lower. In the vast number of small and medium-sized enterprises have a better application. Based on the above two points. This paper attempts to use the three-axis whirlwind milling technology to study the processing of variable diameter, variable lead, variable groove depth screw. The basic research ideas are: based on the mathematical model of variable diameter, variable lead, and variable groove depth screw parts. The whirlwind milling method and theoretical error model are studied to lay the foundation for the high efficiency and low cost machining of the complex special-shaped screw. Firstly, based on the principle of screw forming, the spatial geometric models of variable diameter, variable lead, variable slot depth screw surface and tool rotation surface are established. On this basis, according to the principle of space meshing, the formula of three axis whirlwind milling space envelope condition is deduced, and the limitation of three axis machine tool in space envelope machining is analyzed. The theoretical error model of cross section envelope method is established, and the calculation method of section envelope tool location is optimized, and the tool path planning method is further discussed. Finally, on the basis of the above theoretical research. The machining simulation system based on UG is developed, and the calculation module based on MATLAB is compiled according to the whole calculation process above. The experiment of a extrusion screw model is carried out, and the above theory is verified. The feasibility of triaxial whirlwind milling of variable diameter variable lead variable slot depth screw is proved.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG54

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