共查询到20条相似文献,搜索用时 109 毫秒
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根据差压计锻件形状特点,详细分析了锻件采用可分凹模多向闭塞精密模锻工艺方案的可行性.差压计锻件可以采用普通开式模锻成形和可分凹模多向闭塞精密模锻成形.开式模锻工艺简单,但是需要制坯,工艺流程长,材料利用率低.可分凹模多向闭塞精密模锻能一步顺利成形锻件,产品质量高,工艺稳定,材料利用率可提高20%~30%,但是若在普通模锻设备上生产,模具结构复杂;专用多向模锻设备通用性低;在大批量生产时,采用专用设备生产效益好.本文用塑性成形模拟软件Deform-3D对多向闭塞精密模锻进行了模拟分析,验证了该工艺方案的可行性. 相似文献
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精密锻造成形技术在我国的应用 总被引:3,自引:0,他引:3
简要介绍了精密锻造成形技术的发展概况及主要应用领域,列举了大量的工程应用实例来阐明冷锻成形、温锻成形、闭塞锻造成形、精密热模锻成形、复合成形、等温锻造成形等精密锻造成形工艺在我国的应用情况。 相似文献
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前轴精密辊锻--模锻工艺是一种结合辊锻和模锻的特点而形成的一种复合成形工艺,由于前轴锻件的2/3部位已通过辊锻成形,因此可大大减少模锻打击力,使得使用小型锻造设备即可成形汽车前轴.本文介绍了YO153A前轴精密辊锻工艺产业化应用,由于采用精密辊锻--模锻工艺,在以加强型Φ1000mm自动辊锻机为精密辊锻设备,25000kN摩擦压力机为模锻设备,配以相应规格的加热、切边和热校正设备的生产线上成功地制造出了YO153A前轴.生产线投资显著降低,且前轴锻件尺寸精度好,材料利用率大幅度提高,具有良好的技术经济效果. 相似文献
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讨论了采用楔横轧精密制坯,摩擦压力机精密模锻成形生产摩托车曲柄的新工艺,此工艺具有生产效率高、锻件质量好、节才等诸多优点,值得在该领域推广应用。 相似文献
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文中叙述了用普通热模锻方法锻制双头呆板手工艺所存在的问题,及用冷模锻工艺双头呆扳手代替传统工艺的优点。介绍双样扳手塑性变形的工艺分析,设计锻件图及计算毛坯截面图和直径图,冷模锻模具设计及其模具材料。 相似文献
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Optimum design of forging dies using fuzzy logic in conjunction with the backward deformation method
F.R Biglari N.P O'Dowd R.T Fenner 《International Journal of Machine Tools and Manufacture》1998,38(8):981-1000
A novel shape optimization method is presented for the design of preform die shapes in multistage forging processes using a combination of the backward deformation method and a fuzzy decision making algorithm. In the backward deformation method, the final component shape is taken as the starting point, and the die is moved in the reverse direction with boundary nodes being released as the die is raised. The optimum die shape is thereby determined by taking the optimum reverse path. A fuzzy decision making approach is developed to specify new boundary conditions for each backward time increment based on geometrical features and the plastic deformation of the workpiece. In order to demonstrate this approach, a design analysis for an axisymmetric disk forging is presented in this paper. 相似文献
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设计合适的锻压坯料是保证锻压后锻件具有良好综合性能的基础,通过改进锻压坯料的尺寸来改善锻件各部位的变形程度以获得具有良好组织及性能的锻件。运用有限元模拟软件Deform-3D模拟联接轴等温模锻过程,对不同尺寸的坯料模拟等温锻造过程,随着坯料在Z向厚度尺寸的增加,模锻后锻件的等效应变随之逐渐增加。选择成形效果较佳且模锻后锻件变形程度逐渐增加的锻压坯料进行实验。对热处理后的等温模锻件进行室温拉伸、硬度、电导率、疲劳以及金相实验检测。结果显示:对于横截面沿长轴突变的联接轴锻件,锻件各部位间性能差异较大;等温模锻后,变形程度大的锻件能够获得更好的微观组织和力学性能。 相似文献
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液态压铸锻造双控成形技术研究 总被引:6,自引:3,他引:6
压铸锻造双控成形技术不仅可以像压铸一样控制零件形状和尺寸,而且由于锻造可以使零件产生塑性变形并消除压铸产生的气孔、疏松等缺陷,从而使强度得到较大提高,并且可以通过热处理提高强度。铸锻双控成形工艺主要适合生产形状复杂和高强度要求的汽车零部件和其他结构件。介绍了压铸锻造双控成形技术实现方法和所生产零件的性能。 相似文献
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Guoqun Zhao Ed Wright Ramana V. Grandhi 《International Journal of Machine Tools and Manufacture》1995,35(9)
This paper presents a preform design method which employs an alternative boundary node release criterion in the finite element simulation of backward deformation of forging processes. The method makes use of the shape complexity factor which provides an effective measure of forging difficulty. The objective is to release die contacting nodes in a sequence which will minimize the geometric complexity throughout the backward deformation simulation. This is done by calculating the effect of releasing each of a select group of boundary element nodes at each finite element solution step. The particular detached node which results in the minimum shape complexity factor will be released for the current step. This process continues for each backward step until the last few nodes remain in contact. This design method is demonstrated through the simulated forging of an integrated blade and rotor turbine disk blank. A preform shape developed by this method is compared with an empirically designed preform. Performance parameters for comparison include die fill, flash volume, effective strain variance, frictional power and die load. Comparing the results of the forward simulations indicates improved performance of the preform design using FEM based backward deformation method over that of the empirical design. 相似文献
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A new technique has been developed for the design of die shapes in the plane strain forging process. The objective of this research work is to develop a design procedure to obtain the number of stages and the shape of each die for manufacturing a desired product. Metal flow during the forging is considered in the design of the intermediate die shapes in multistage forgings. The two approaches developed for the preform shapes design are conformal mapping techniques and ideal material flow simulations. The forging process is simulated using a nonlinear rigid visco plastic finite element program ALPID (analysis of large plastic incremental deformation). Staging criteria is developed from the results of the forging simulation and the number of stages are based on the stress ratio parameterg (mean stress/effective stress) and strain rate gradient information. This paper presents two examples of forgings to demonstrate an optimal die shape design methodology. 相似文献