本文選題：重載夾持裝置 + 承載性能　； 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：重載夾持裝置承載性能的高低直接影響其操作的可靠性與夾持穩(wěn)定性。定量分析和明確各工況下重載夾持裝置的承載性能及其影響因子,對重載夾持裝置的設(shè)計與應(yīng)用具有重要的意義,同時一種新型的高效節(jié)能的重載夾持裝置對于提高鍛造操作機(jī)的工作能力具有很大幫助。論文完成的主要工作包括：第一章闡述了操作機(jī)的應(yīng)用及重載夾持裝置的主要形式,研究了重載夾持裝置承載性能和結(jié)構(gòu)優(yōu)化設(shè)計的現(xiàn)狀,分析了其不足之處,并給出了本文研究的主要內(nèi)容。第二章以壓桿式重載夾持裝置為研究對象,建立了其承載性能的分析模型。分析計算了夾持裝置傳動機(jī)構(gòu)的傳力比與鍛件直徑的關(guān)系,基于力矩分解法分別建立了夾持裝置無偏角及有下偏角兩種工況下夾持鍛件時鉗口在任意角度的夾持效率的計算模型。對影響鉗口夾持效率的因素進(jìn)行了分析,獲得了能夠提高夾持效率且影響權(quán)重較大的結(jié)構(gòu)參數(shù),為探討動態(tài)承載工況下夾持裝置承載性能的變化規(guī)律和以提高承載性能為目標(biāo)的夾持裝置改進(jìn)設(shè)計提供理論支持。第三章提出了重載夾持裝置結(jié)構(gòu)胞變設(shè)計技術(shù),以典型壓桿式重載夾持裝置為設(shè)計原型,以提高承載性能為目的,通過對影響其承載性能的結(jié)構(gòu)參數(shù)進(jìn)行多層次胞變操作,實現(xiàn)了重載夾持裝置的改進(jìn)設(shè)計,通過對重載夾持裝置改進(jìn)前后承載性能的數(shù)值模擬及結(jié)果對比分析,證明了重載夾持裝置改進(jìn)設(shè)計的可行性。第四章研究了重載夾持裝置傳動機(jī)構(gòu)的多目標(biāo)優(yōu)化方法,根據(jù)傳動機(jī)構(gòu)的參數(shù)確定了設(shè)計變量及其約束條件,建立了傳動機(jī)構(gòu)的多目標(biāo)優(yōu)化模型。采用多目標(biāo)優(yōu)化算法求解,將優(yōu)化結(jié)果與數(shù)值模擬分析結(jié)果進(jìn)行了對比,驗證了優(yōu)化結(jié)果的準(zhǔn)確性。第五章通過整機(jī)裝配體模型的有限元仿真分析,驗證了改進(jìn)后重載夾持裝置的結(jié)構(gòu)強(qiáng)度,并對鉗臂結(jié)構(gòu)進(jìn)行了拓?fù)鋬?yōu)化,得到了鉗臂較完善、較合理的結(jié)構(gòu)構(gòu)型,使其材料分布趨于合理。同時對重載夾持裝置改進(jìn)前后在最大載重狀態(tài)下旋轉(zhuǎn)的過程進(jìn)行了動力學(xué)仿真對比分析,驗證了本文所構(gòu)建的針對夾持裝置鉗口任意位置夾持效率計算模型的準(zhǔn)確性及對重載夾持裝置胞變設(shè)計的合理性。
[Abstract]:The load-bearing performance of heavy-load clamping device directly affects its operation reliability and clamping stability. It is of great significance for the design and application of heavy load clamping device to quantitatively analyze and make clear the bearing capacity and its influencing factors of heavy load clamping device under various working conditions. At the same time, a new type of high efficiency and energy saving heavy load clamping device is helpful to improve the working ability of forging operator. The main work of this paper is as follows: in the first chapter, the application of the operator and the main forms of the heavy load clamping device are described, and the present situation of the load bearing performance and structural optimization design of the heavy load clamping device is studied, and its shortcomings are analyzed. The main contents of this paper are also given. In the second chapter, an analytical model of the load-bearing capacity of the pressure-bar type heavy-load gripper is established. The relation between the transmission force ratio of the transmission mechanism of the clamping device and the diameter of the forgings is analyzed and calculated. Based on the moment decomposition method, the calculation models of clamping efficiency of forgings at any angle when clamping forgings are set up under two working conditions, that is, no deviation angle of clamping device and one with lower deflection angle, are established respectively. The factors influencing the clamping efficiency are analyzed, and the structural parameters which can improve the clamping efficiency and influence the weight are obtained. It provides theoretical support for the study of the variation of the load bearing performance of the clamping device under the dynamic load loading condition and the improvement design of the clamping device aimed at improving the load bearing performance. In the third chapter, the cellular design technology of heavy load clamping device is proposed. The typical heavy load clamping device is used as the prototype, and the structural parameters that affect its bearing performance are operated by multilayer cellular transformation operation, which is aimed at improving the bearing capacity of the device. The improved design of heavy load clamping device is realized. The feasibility of improving the design of heavy load clamping device is proved by the numerical simulation of the load bearing performance before and after the improvement and the comparative analysis of the results. In chapter 4, the multi-objective optimization method of the transmission mechanism of heavy load clamping device is studied. According to the parameters of the transmission mechanism, the design variables and their constraints are determined, and the multi-objective optimization model of the transmission mechanism is established. The optimization results are compared with the numerical simulation results by using multi-objective optimization algorithm to verify the accuracy of the optimization results. The fifth chapter verifies the structural strength of the improved heavy-duty clamping device through the finite element simulation analysis of the assembly body model of the whole machine, and optimizes the structure of the clamp arm, and obtains the more perfect and reasonable structure configuration of the clamp arm. The distribution of the material tends to be reasonable. At the same time, the dynamic simulation analysis of the rotating process of the heavy load clamping device under the maximum load state before and after the improvement is carried out. The accuracy of the computational model for the clamping efficiency at any position of the clamp mouth and the rationality of the cellular design of the heavy load clamping device are verified in this paper.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG75

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