本文選題：八連桿機(jī)構(gòu)　切入點(diǎn)：類型綜合　出處：《揚(yáng)州大學(xué)》2013年碩士論文

【摘要】：隨著沖壓行業(yè)的飛速發(fā)展,沖壓工藝的要求越來(lái)越高,機(jī)床的更新?lián)Q代也越來(lái)越快。傳統(tǒng)機(jī)械壓力機(jī)的主傳動(dòng)機(jī)構(gòu)主要采用曲柄連桿機(jī)構(gòu)。曲柄連桿機(jī)構(gòu)在沖壓工作時(shí),由于滑塊的加速度大而引起的噪聲和振動(dòng),降低了機(jī)床和模具的使用精度。因此,需要尋找到新型的傳動(dòng)機(jī)構(gòu)代替曲柄連桿機(jī)構(gòu)。本文提出一種采用單自由度八連桿機(jī)構(gòu)替代曲柄滑塊機(jī)構(gòu)的新型機(jī)構(gòu),并分析了其運(yùn)動(dòng)特性,同時(shí)對(duì)單自由度八連桿機(jī)構(gòu)進(jìn)行優(yōu)化設(shè)計(jì),全文的工作內(nèi)容如下： 1)通過(guò)對(duì)單自由度八連桿機(jī)構(gòu)的運(yùn)動(dòng)鏈進(jìn)行類型綜合,將得到所有的八連桿機(jī)構(gòu)運(yùn)動(dòng)鏈類型進(jìn)行拓?fù)涮匦缘挠?jì)算、比較、分析,從而選擇適合構(gòu)型。 2)對(duì)單自由度八連桿機(jī)構(gòu)構(gòu)型建立直角坐標(biāo)系并進(jìn)行運(yùn)動(dòng)學(xué)分析,運(yùn)用解析法分析各個(gè)桿件的角位移、角速度、角加速度；得到壓力機(jī)滑塊的位移、速度、加速度；通過(guò)運(yùn)動(dòng)仿真軟件獲得滑塊的運(yùn)動(dòng)軌跡,并與曲柄連桿機(jī)構(gòu)的運(yùn)動(dòng)軌跡進(jìn)行對(duì)比分析,得到八連桿機(jī)構(gòu)的優(yōu)勢(shì)所在。在運(yùn)動(dòng)學(xué)的分析的基礎(chǔ)上進(jìn)行動(dòng)力學(xué)分析,得到各個(gè)桿件質(zhì)心處的位移、速度、加速度,運(yùn)用動(dòng)態(tài)靜力分析法求得桿件的慣性力和慣性力矩,最終建立了拉格朗日的動(dòng)力學(xué)模型,為下面的研究提供理論基礎(chǔ)。 3)利用動(dòng)力學(xué)仿真軟件ADAMS建立與實(shí)際傳動(dòng)機(jī)構(gòu)等比例的單自由度八連桿機(jī)構(gòu)的運(yùn)動(dòng)學(xué)仿真模型。通過(guò)參數(shù)化設(shè)計(jì)方法,以降低桿件質(zhì)心處加速度為目標(biāo)對(duì)連桿機(jī)構(gòu)進(jìn)行優(yōu)化設(shè)計(jì),從而獲得較小的慣性力和慣性力矩。 4)根據(jù)優(yōu)化所得到的數(shù)據(jù),運(yùn)用三維設(shè)計(jì)軟件對(duì)單自由度八連桿機(jī)構(gòu)的各個(gè)桿件零件重新設(shè)計(jì),并且將其裝配模型導(dǎo)入到ADAMS中,再次進(jìn)行運(yùn)動(dòng)學(xué)和動(dòng)力學(xué)仿真。得到優(yōu)化后滑塊的運(yùn)動(dòng)軌跡和部分桿件質(zhì)心的加速度曲線圖。通過(guò)降低加速度的大小,也就降低機(jī)構(gòu)桿件在工作時(shí)的慣性力以及慣性力矩的大小,從而達(dá)到優(yōu)化的目的。
[Abstract]:With the rapid development of stamping industry, the requirements of stamping technology are becoming higher and higher, and the replacement of machine tools is becoming faster and faster. The main transmission mechanism of traditional mechanical press mainly adopts crank and connecting rod mechanism. The noise and vibration caused by the acceleration of the slider reduce the accuracy of the machine tool and die. It is necessary to find a new transmission mechanism to replace the crank linkage mechanism. In this paper, a new type of mechanism is proposed to replace the crank slider mechanism with a single degree of freedom eight linkage mechanism, and its motion characteristics are analyzed. At the same time, the optimization design of the single-degree-of-freedom eight-bar mechanism is carried out. The work of this paper is as follows:. 1) by synthesizing the kinematic chain of the single-degree-of-freedom eight-bar linkage mechanism, the topological characteristics of all the kinematic chain types of the eight-bar linkage mechanism are calculated, compared and analyzed, and the suitable configuration is selected. 2) establishing the right-angle coordinate system for the configuration of the single-degree-of-freedom eight-bar linkage mechanism and analyzing the kinematics, using the analytical method to analyze the angular displacement, angular velocity and angular acceleration of each member, and to obtain the displacement, velocity and acceleration of the slide block of the press. The motion trajectory of the slider is obtained by the motion simulation software, and compared with that of the crank linkage, the advantage of the eight-bar mechanism is obtained. The dynamic analysis is carried out on the basis of kinematics analysis. The displacement, velocity and acceleration of the center of mass of each member are obtained, and the inertia force and inertia moment of the member are obtained by using dynamic static analysis method. Finally, the Lagrange dynamic model is established, which provides the theoretical basis for the following research. 3) using the dynamic simulation software ADAMS to establish the kinematics simulation model of the single-degree-of-freedom eight-bar mechanism with equal proportion to the actual transmission mechanism. With the aim of reducing the acceleration at the center of mass of the rod, the linkage mechanism is optimized and the inertial force and moment of inertia are obtained. 4) according to the data obtained from the optimization, three dimensional design software is used to redesign each member part of the single-degree-of-freedom eight-bar mechanism, and the assembly model is imported into ADAMS. The kinematics and dynamics simulation is carried out again. The trajectory of the optimized slider and the acceleration curve of the center of mass of some members are obtained. By reducing the acceleration, It also reduces the inertia force and the inertia moment of the mechanism member in operation, so as to achieve the purpose of optimization.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH112

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