【作者】 李飞；

【导师】 吴伏家；

【作者基本信息】 中北大学 ， 动力机械及工程， 2008， 硕士

【摘要】 长期以来汽车制造商一直在寻找采用新材料的可能性。而钛合金材料的高比强、高弹性能吸收能力和优异的抗腐蚀性引起汽车制造商的注意。因此,钛合金将越来越广泛地应用于汽车制造业。在提高发动机功率的同时,在不损失强度的条件下,应尽量减少往复运动机构的质量,采用高强度及强耐热钛合金就能解决这个问题。在发动机中采用钛合金有着极佳的效果,并具有良好的发展前景。然而钛合金难以加工成形的性质使得其产品价格太高,阻碍了钛合金在汽车上的广泛应用。要解决这个矛盾,首先要对钛合金的成形工艺进行研究。在这种背景下,本文以TC4钛合金复杂构件为实例,开展钛合金难变形复杂结构件等温锻造工艺的研究。本文研究的TC4钛合金复杂结构件一直采用机械加工工艺生产,材料利用率仅为16.7%。随着钛合金价格上扬,造成构件的坯料成本增加,为了提高材料利用率、降低坯料成本,采用等温锻造新工艺,先锻造出产品外形,然后机加工出成品,材料利用率可提高到40%左右,同时生产周期大大缩短。为实现TC4钛合金复杂结构件等温锻造,本文的主要工作内容有以下几点:第一:用DEFORM软件模拟该构件等温锻造过程。通过软件模拟,了解在等温锻造条件下,构件成形的应力应变、金属流动情况和行程载荷曲线,确定设计的工艺参数、毛坯外形及试验设备吨位的选取。第二:根据大量的理论研究和数值模拟,设计出了一套等温锻造模具。第三:进行了等温锻造现场试验,并成功地锻造出了各项性能指标都合格的TC4钛合金复杂结构件。更多还原

【Abstract】 For a long time the automobile manufacturers have been looking at the possibilityof using new materials, the Titanium alloy materials of the high strength and highflexibility and the ability to absorb excellent and corrosion resistance arouse theattention of automobile manufacturers. Therefore, the Titanium alloy will becomeincreasingly widely used in automobile industry. Increasing the engine power at thesame time and without losing the strength, reciprocating movement machine shouldminimize the quality. Using the high-strength and heat-resistant Titanium alloys will beable to solve this problem, the titanium alloy use in the engine and have a goodprospects for development. But Titanium alloy belong to hand-to-machine materialcharacter and make the prices of the product too high, restraining the use of Titaniummaterial in motorcar industry .Solving this contradiction, we need research the processof Titanium alloy forging firstly. This paper take TC4 Titanium alloy for an example,we study to preliminary of Isothermal forging process of complex Titanium alloycomponents.We work on TC4 titanium alloy components adopted machining operation,efficient material using is 16.7%, with the price of the Titanium alloy too high, the costof stock material is rise. Adopting the isothermal forging process. We firstly Isothermalforging part profile, lastly correct contour of part used machining operation, thematerial using can be increase to about 40%, production cycle will be rapidly reduced.To achieve the TC4 complex components of isothermal forging, the follow arethe main content of the work in this paper:Firstly, isothermal forging process of components is simulated by DEFORMsoftware. We can understand the process of stress, strain and metal fluidity inIsothermal forging condition, and design Isothermal forging process and stock contourand selection of the test equipment tonnage according these simulate. Secondly, based on a large number of the theoretical research and numericalsimulation, design a set of isothermal forging die.Finally, have a scene test of the isothermal forging and have succeeded in forging,the TC4 complex components are qualified in performance index.更多还原