本文關(guān)鍵詞： 液態(tài)模鍛機機架 ANSYS Workbench 溫度場 熱-結(jié)構(gòu)耦合 變形　出處：《浙江工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：液態(tài)模鍛是一種能夠有效避免鑄件氣孔、縮孔、疏松等缺陷的優(yōu)質(zhì)、高效、節(jié)能、適應性廣的現(xiàn)代制造工藝。由于其各方面的優(yōu)越性,液態(tài)模鍛工藝已在工業(yè)生產(chǎn)中得到廣泛應用。液態(tài)模鍛液壓機是實現(xiàn)液態(tài)模鍛工藝的基礎(chǔ)設備,其剛度強度性能直接影響到整機的安全和產(chǎn)品的質(zhì)量及生產(chǎn)效率,以往對液態(tài)模鍛液壓機機架的設計和研究常是在單獨考慮力載荷的情況下進行的,但在實際工作過程中,具有溫度的模具不可避免地對機架產(chǎn)生一定的熱影響,使機架產(chǎn)生熱應力和熱變形。本文以6300KN多向液態(tài)模鍛液壓機為研究對象,采用Solidworks和ANSYS Workbench軟件,對極限熱源、滿載工況下的液態(tài)模鍛液壓機機架進行了熱-結(jié)構(gòu)耦合分析,得到了機架的溫度場和應力變形場分布情況,對機架進行了剛度強度校核,并與機架的結(jié)構(gòu)靜力分析結(jié)果進行對比分析,發(fā)現(xiàn)在同時考慮熱載荷和力載荷的情況下,液壓機機架不能滿足剛度要求,說明在設計和研究液態(tài)模鍛機機架時考慮熱影響的必要性。本文對影響機架應力變形的熱因素和結(jié)構(gòu)因素進行了研究,發(fā)現(xiàn)隔熱板厚度和活動橫梁結(jié)構(gòu)對機架最大變形值的影響比較顯著,在此基礎(chǔ)上,提出合理的改進方案,使機架滿足剛度強度要求,并對影響活動橫梁導向正確性的立柱-動梁導套間的側(cè)隙在不同偏心距下進行了研究,為活動橫梁立柱孔的設計和活動橫梁的安裝提供了一定指導。液態(tài)模鍛液壓機經(jīng)常承受多次反復加載及卸載,后者會引起劇烈的振動與晃動,立柱容易發(fā)生高周疲勞,故本文在對改進后機架進行熱-結(jié)構(gòu)耦合分析的基礎(chǔ)上,對立柱進行了疲勞壽命分析,得到立柱在考慮力載荷和熱載荷時滿足疲勞壽命和疲勞強度要求,并為立柱的實際使用壽命提供預測。
[Abstract]:Liquid die forging is a kind of modern manufacturing technology which can effectively avoid defects such as porosity, shrinkage, porosity and so on. It is of high quality, high efficiency, energy saving and wide adaptability. Liquid die forging technology has been widely used in industrial production. Liquid die forging hydraulic press is the basic equipment to realize liquid die forging process. Its stiffness and strength performance directly affect the safety of the whole machine and the product quality and production efficiency. In the past, the design and research of the liquid die forging hydraulic press frame was carried out under the condition of considering the force load alone. However, in the actual working process, the mold with temperature will inevitably have a certain thermal impact on the frame. The thermal stress and deformation of the frame are produced. This paper takes 6300KN multi-direction liquid die forging hydraulic press as the research object, and adopts Solidworks and ANSYS Workbench software. The thermo-structural coupling analysis of the liquid die forging hydraulic press frame under the limit heat source and full load condition is carried out, the distribution of temperature field and stress and deformation field of the frame is obtained, and the stiffness strength of the frame is checked. Compared with the static analysis results of the frame, it is found that the hydraulic press frame can not meet the requirements of stiffness when the thermal load and the force load are considered at the same time. It is necessary to consider the thermal effect in the design and study of the liquid die forging machine frame. The thermal and structural factors affecting the stress and deformation of the frame are studied in this paper. It is found that the thickness of the insulation plate and the structure of the moving beam have a significant effect on the maximum deformation value of the frame. On this basis, a reasonable improvement scheme is put forward to make the frame meet the requirements of stiffness and strength. The clearance between column and guide sleeve of moving beam is studied under different eccentricity. The liquid die forging hydraulic press is often subjected to repeated loading and unloading, the latter will cause violent vibration and sloshing. The column is prone to high cycle fatigue, so the fatigue life of the column is analyzed on the basis of the thermal-structural coupling analysis of the improved frame. The results show that the column meets the requirements of fatigue life and fatigue strength when considering the force load and thermal load, and provides a prediction for the actual service life of the column.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG315.4

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