【摘要】：隨著科學(xué)技術(shù)的進(jìn)步和發(fā)展,使得種類(lèi)繁多的自動(dòng)、半自動(dòng)機(jī)械在各個(gè)領(lǐng)域得到了十分廣泛的應(yīng)用。其中,機(jī)械產(chǎn)品研究領(lǐng)域的一個(gè)熱點(diǎn)研究,就是間歇機(jī)構(gòu)。該機(jī)構(gòu)可以根據(jù)生產(chǎn)工藝的需要,完成預(yù)定的不連續(xù)的工藝操作。間歇機(jī)構(gòu)將連續(xù)的輸入運(yùn)動(dòng)轉(zhuǎn)換為具有某種運(yùn)動(dòng)規(guī)律的時(shí)動(dòng)時(shí)歇的周期性的輸出運(yùn)動(dòng)�，F(xiàn)代工業(yè)向著高速化、重載荷和高精度的方向發(fā)展,這也就對(duì)間歇機(jī)構(gòu)結(jié)構(gòu)設(shè)計(jì)和運(yùn)動(dòng)性能提出了更高的要求。 目前,常用的分度凸輪機(jī)構(gòu)分為平行分度凸輪機(jī)構(gòu)、弧面分度凸輪機(jī)構(gòu)與圓柱分度凸輪機(jī)構(gòu)三種基本類(lèi)型。并且根據(jù)需求,將這些機(jī)構(gòu)組合改進(jìn),研究出各種變異機(jī)構(gòu)。 本文應(yīng)用組合機(jī)構(gòu)的創(chuàng)新設(shè)計(jì)理論,基于內(nèi)平動(dòng)齒輪的傳動(dòng)原理,提出了內(nèi)平動(dòng)分度凸輪機(jī)構(gòu)。該機(jī)構(gòu)分度數(shù)大、結(jié)構(gòu)緊湊,可以在高速工況下運(yùn)轉(zhuǎn)。 論文首先根據(jù)該機(jī)構(gòu)的傳動(dòng)方式,對(duì)機(jī)構(gòu)的傳動(dòng)原理、結(jié)構(gòu)組成進(jìn)行深入的研究,提出機(jī)構(gòu)可實(shí)現(xiàn)大分度數(shù)、高速的最優(yōu)機(jī)構(gòu)設(shè)計(jì)方案。接著依據(jù)已知的設(shè)計(jì)參數(shù)研究了凸輪廓線(xiàn)形成原理,并結(jié)合輸出件針輪的運(yùn)動(dòng)規(guī)律,建立凸輪—針輪運(yùn)動(dòng)矢量關(guān)系坐標(biāo)系,完成了對(duì)分度凸輪廓線(xiàn)方程的推導(dǎo)。 第二,利用Matlab軟件,對(duì)凸輪的重要幾何特性進(jìn)行了分析計(jì)算。主要包括如下內(nèi)容：初步生成凸輪的理論廓線(xiàn)；分析凸輪廓線(xiàn)的曲率半徑,得到凸輪的實(shí)際廓線(xiàn)；推導(dǎo)出凸輪各段廓線(xiàn)的壓力角與時(shí)間的函數(shù)關(guān)系；對(duì)針齒在嚙合點(diǎn)處作用力的力臂進(jìn)行分析,根據(jù)力矩平衡方程計(jì)算出所有針齒所受的嚙合力。 最后,本文對(duì)內(nèi)平動(dòng)分度凸輪機(jī)構(gòu)的實(shí)驗(yàn)樣機(jī)進(jìn)行研制。
[Abstract]:With the progress and development of science and technology, semi-automatic machinery has been widely used in various fields. One of the hotspots in the field of mechanical product research is the intermittent mechanism. According to the requirements of the production process, the organization can complete the scheduled discontinuous process operation. The intermittent mechanism converts the continuous input motion into the periodic output motion with a certain motion law. Modern industry is developing towards the direction of high speed, heavy load and high precision, which puts forward higher requirements for the structure design and motion performance of intermittent mechanism. At present, the commonly used indexing cam mechanism is divided into three basic types: parallel indexing cam mechanism, globoidal indexing cam mechanism and cylindrical indexing cam mechanism. And according to the demand, the combination of these institutions will be improved to develop a variety of variation mechanisms. In this paper, based on the driving principle of internal translational gear, an internal translational indexing cam mechanism is proposed based on the innovative design theory of the combined mechanism. The structure of the mechanism is large, compact, and can be operated at high speed. Firstly, according to the transmission mode of the mechanism, the transmission principle and the structure composition of the mechanism are studied deeply, and the optimal design scheme of the mechanism with large degrees and high speed is put forward. Then according to the known design parameters, the principle of cam contour formation is studied, and the motion vector coordinate system of cam-needle wheel is established in combination with the motion law of the pin wheel of the output part, and the equation of indexing cam contour is deduced. Secondly, the important geometric characteristics of cam are analyzed and calculated by Matlab software. The main contents are as follows: the theoretical profile of cam is generated preliminarily, the curvature radius of cam contour is analyzed, the actual profile of cam is obtained, and the function of pressure angle and time of cam profile is deduced. The force arm of the force acting on the needle tooth at the engagement point is analyzed and the engagement force of all the needle teeth is calculated according to the moment balance equation. Finally, the experimental prototype of internal translational indexing cam mechanism is developed.
【學(xué)位授予單位】：天津科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TH112.2

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