發(fā)布時間：2018-06-28 10:09

  本文選題：薄壁銅管 + 上料系統(tǒng)　； 參考：《江西理工大學》2017年碩士論文

【摘要】：現(xiàn)有的薄壁銅管游動芯頭拉拔機都采用人工進行上料,但人工上料不僅勞動強度大,而且生產效率低,已經(jīng)不能滿足現(xiàn)代工程的需要,要實現(xiàn)薄壁銅管游動芯頭拉拔機自動上料存在兩大技術難點,一是游動芯頭穿芯定位精度高,二是因銅管長且撓度大造成銅管單根分選困難。同時,銅管缺陷和拉拔工藝參數(shù)等對拉拔成形具有較大的影響。因此,本文的研究具有良好的研究價值與應用前景。論文采用理論分析、數(shù)值模擬與試驗分析相結合的方法完成以下工作:針對游動芯頭穿進銅管裝配問題,通過游動芯頭穿芯空間誤差分析,建立裝配尺寸鏈并求解,確定游動芯頭穿芯技術方案;針對大撓度銅管單根分選問題,對銅管分選進行動力學仿真分析,確定分選方案;完成拉拔機自動上料系統(tǒng)機械結構與控制系統(tǒng)設計;結合實際生產,對游動芯頭拉拔過程進行有限元模擬分析。論文的主要研究結果:(1)對管坯、芯桿、游動芯頭組成的空間裝配系統(tǒng)進行分析,定量描述游動芯頭穿芯空間定位誤差,以游動芯頭與銅管間隙為封閉環(huán),建立銅管穿芯裝配空間尺寸鏈,采用大數(shù)互換法對裝配尺寸鏈實例求解說明,確定游動芯頭穿芯方法和穿芯技術方案,即采用V型塊定位,結合雙旋自定心夾緊機構方式可完成芯頭定位穿芯。(2)在分析單根銅管分選特征基礎上,基于ADAMS建立銅管分選模型,以分選Φ106mm薄壁管材為例,探討工藝參數(shù)(分選速度、傾斜角度、銅管撓度)對單根銅管分選技術指標(上升高度、分選完成時間、接觸力)的影響,再基于ADAMS建立多根銅管分選模型,探討工藝參數(shù)(分選速度、傾斜角度)對銅管分選效果(分選率、分選時間、重疊率)的影響,得到分選速度在400mm/s~800mm/s、傾斜角度在35°~40°分選效果較好,并通過試驗驗證。(3)在常規(guī)拉拔機的基礎上,結合游動芯頭穿芯技術方案和銅管分選裝置仿真分析結果,將自動上料系統(tǒng)分為分選、輸送、定位穿芯、雙移位和送進5個模塊,對每個模塊進行結構設計,并完成上料系統(tǒng)控制系統(tǒng)初步設計。(4)針對銅管壁厚不均勻等問題,以H62合金為例,通過H62銅合金單向拉伸試驗,采用彈粘塑性模型,構建H62銅合金本構模型,基于MARC軟件對薄壁銅管游動芯頭拉拔過程數(shù)值模擬,定量分析銅管壁厚波動與摩擦系數(shù)對拉拔過程(拉拔力、等效應力應變、芯頭軸向運動)的影響,并對比分析游動芯頭拉拔和固定芯頭拉拔,發(fā)現(xiàn)游動芯頭拉拔有助于提高產品質量。
[Abstract]:The existing thin-walled copper pipe moving core drawing machines use manual feeding, but the manual feeding not only has a large labor intensity, but also has low production efficiency, so it can not meet the needs of modern engineering. In order to realize the automatic feeding of thin wall copper pipe moving core drawing machine, there are two major technical difficulties: one is the high positioning accuracy of the swimming core head through the core, the other is the difficulty of single copper pipe sorting due to the long copper pipe and large deflection. At the same time, copper tube defects and drawing process parameters have great influence on drawing forming. Therefore, the research of this paper has good research value and application prospect. In this paper, the method of theoretical analysis, numerical simulation and experimental analysis is used to accomplish the following work: to solve the assembly problem of the floating core head, the dimension chain is established and solved by analyzing the spatial error of the swimming core head through the copper pipe. To solve the problem of single separation of large deflection copper pipe, the dynamic simulation analysis of copper pipe sorting is carried out to determine the separation scheme, and the mechanical structure and control system design of automatic feeding system of drawing machine are completed. Combined with the actual production, the drawing process of the moving core head is simulated and analyzed by finite element method. The main results of this paper are as follows: (1) the spatial assembly system composed of tube billet, core rod and swimming core head is analyzed, and the space positioning error of walking core head is quantitatively described. The gap between the swimming core head and copper pipe is taken as the closed ring. The space dimension chain of copper pipe through core assembly is established, and the example of assembly dimension chain is solved by large number exchange method. The core piercing method and the core piercing technique scheme are determined, that is, V-shaped block positioning is adopted. Combined with the double rotation self-centring clamping mechanism, the core head can be positioned through the core. (2) on the basis of analyzing the separation characteristics of a single copper pipe, the separation model of copper pipe is established based on Adams. Taking 桅 106mm thin wall pipe as an example, the process parameters (separation speed) are discussed. The influence of inclined angle, deflection of copper pipe on the technical index of single copper pipe separation (rising height, finishing time, contact force) is discussed. Based on Adams, the separation model of multiple copper pipes is established, and the process parameters (separation speed, separation speed) are discussed. The effect of inclined angle on the separation efficiency (separation rate, separation time, overlap rate) of copper pipe shows that the separation speed is 400 mm / s / s, and the inclination angle is 35 擄/ 40 擄, which is proved by experiments. (3) on the basis of conventional drawing machine, the separation speed is 400 mm / s / s and the angle is 35 擄/ 40 擄. (3) on the basis of conventional drawing machines, Combined with the technical scheme of core piercing and the result of simulation analysis of copper pipe sorting device, the automatic feeding system is divided into five modules: sorting, conveying, locating, double shifting and feeding into the core, and the structure of each module is designed. The control system of feeding system is designed. (4) aiming at the problem of uneven wall thickness of copper pipe, taking H62 alloy as an example, the constitutive model of H62 copper alloy is constructed by using elastic-viscoplastic model through uniaxial tensile test of H62 copper alloy. Based on the numerical simulation of the drawing process of the floating core of thin wall copper pipe by Marc software, the effects of wall thickness fluctuation and friction coefficient on the drawing process (drawing force, equivalent stress and strain, axial movement of the core head) are quantitatively analyzed. By comparing and analyzing the moving core head drawing and the fixed core head drawing, it is found that the swimming core head drawing is helpful to improve the product quality.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG356

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