共查询到19条相似文献,搜索用时 125 毫秒
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热锻-冷锻复合塑性成形技术将热锻和冷锻技术结合起来使用,可成形高精度的复杂形状零计,且降低了成本,取得了良好的效果.介绍了热锻冷报技术的概况及其在工业生产中的若干应用实例. 相似文献
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本文主要从成形工艺、变形规律和力学分析等方面,详细阐述了国内外对于直齿轮精锻成形技术的研究进展,并评述了该技术的未来发展趋势。 相似文献
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本文阐述我国汽车粉末冶金件生产现状及需求,介绍粉末冶金新技术-热锻、温压成形、 金属粉末注射成形、组合烧结等技术在汽车上的应用及发展趋势。 相似文献
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通过理论分析和大量的工艺试验,制定了7075铝合金筒形机匣等温精锻的成形工艺方案,确定了精锻时采用分瓣式组合凹模及其模具结构,介绍了方案实施的有关技术措施。 相似文献
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Numerical and experimental investigation of cold rotary forging of a 20CrMnTi alloy spur bevel gear 总被引:1,自引:0,他引:1
Due to the complex three-dimensional (3D) geometry and tooling design, mass production of precision spur bevel gears by machining or conventional forging technology is impeded by numerous stubborn barriers to date. Cold rotary forging, an innovative incremental metal forming process, has great potential to improve the current situation owing to its flexibility and low tool load requirement. In the present study, a sound 3D rigid-plastic finite element (FE) model of cold rotary forging of a 20CrMnTi alloy spur bevel gear is developed under the DEFORM-3D platform. To ensure the precision of the proposed FE model, a series of experiments are well performed for the identification of the mechanical properties of 20CrMnTi alloy and the realistic friction conditions prevailing at the die-workpiece interface. By utilising this FE model, the workpiece geometry is optimised with the intention of achieving a better filling of gear shape and a lower forming load requirement, and then the distribution of different field-variables such as flow velocity and effective strain are thoroughly investigated. For verification purposes, the cold rotary forging experiments of 20CrMnTi alloy spur bevel gears are subsequently conducted. Good agreement between the experimental results and the simulation ones is highlighted by comparing the gear shape after cold rotary forging and the axial forging force, which validates employed model. 相似文献
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Huamin LIU)+ Liangju HUANG) Shenhua YANG) Shihong ZHANG) ) Institute of Roll Forging Technology Jilin University Changchun China ) Institute of Metal Research Chinese Academy of Sciences Shenyang China 《材料科学技术学报》2005,21(6):925-928
1. Introduction Closed-died cold forging technology is a new precision forming method. It was developed from the 1980's, by which large deformation and complex moulding surfaces can be obtained in one step. So it suits to the production of the complex parts[1,2]. The principle of closed-die cold forging is different from forging. For closed-die forging, it is a combination of radial extrusion and forging. Its principle is shown in Fig.1. The tool consists of dies and punches. The forming pro… 相似文献
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精密锻造成形技术是应用范围越来越广泛的一种先进制造技术。本文简要介绍了精密锻造成形技术的发展概况,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、铝合金的精密锻造成形、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。在给出了我国精密锻造成形技术目前发展中存在的主要问题的基础上,指出了精密锻造成形技术的发展趋势。 相似文献
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Wear reduction on dies for precision forging of gear wheels by means of multi‐layer coating (TiN‐TiCN‐TiC) Due to high thermal, mechanical and tribological loads the tool life quantity of hot forging dies compared to other manufacturing processes is relatively low. Depending on the number of forged parts the mentioned loads lead to different failure causes of the dies. In this connection wear is the main failure cause of hot forging dies. Especially in the precision forging process of gear wheels with its exacting tolerances the tool life quantity is low, which leads to often interruptions of the production process. Because wear concentrates on the near‐surface die areas, these problems can be reduced by increasing the wear resistance of these areas by the Duplex PACVD‐Method, which means nitriding and multi‐layer coating (TiN‐TiCN‐TiC). 相似文献