共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
介绍了康明斯6B柴油机曲轴在锻压机上的曲面分模直接模锻成型工艺。对工艺方案的确定及锻模设计中的一些关键问题进行了分析,应用该模锻工艺和模具,已累主地生产康明斯6B柴油机轴锻件2万多件,替代了进口,保证了康明斯发动机国产化对曲轴锻件的需求。 相似文献
3.
锻件重量大于100kg、需万吨级以上锻造设备来成形的模锻件定义为大型模锻件,大型模锻件主要有重型载货汽车前轴、大功率柴油机曲轴等。曲轴和前轴作为商用车特别是重型车的最关键零部件之一,对生产装备有着较高的要求。目前,国内万吨级以上锻造设备主要有热模锻压力机、电动螺旋压力机等。与模锻锤比较,在锻压机上模锻,一是可降低金属损耗5%~10%,自动化程度高,与锻锤以蒸汽为动力比,节能80%以上;二是汽车发动机曲轴的轴颈余量不超过3mm,轴承轴颈直径公差±1.7 0.8mm,轴颈长度公差为±1.5 0.6mm,在锤上模锻难以 相似文献
4.
叙述了国内外在63MN热模锻压力机上模锻曲轴和转向节等零件的工艺特点,模锻变形力、节能节材效果,以供同吨位压力机线设计和同类型锻件生产参考。 相似文献
5.
重型载重汽车用发动机的主要零件-卡特曲轴锻件由于结构上的特殊性,在模锻锤上用常规工艺生产有一定困难。这里通过在模锻锤生产此产品出现的质量问题进行综合分析,并根据历年来在锻造工艺方面的研究.制定了新的工艺措施,解决了试制过程中出现的一系列问题。 相似文献
6.
7.
8.
(二)结构钢、型材和钢板类零件(1)锻件:“桑塔纳”中的锻件,大多采用优质碳素结构钢,此类零件有,模锻曲轴、连杆、连杆盖与进排气门盘部等。锻钢曲轴只用于强化的发动机中,它的材料相当于50~#钢。模锻后正火。材料的化学成份(%): C=0.5;Mn=0.75;Si=0.3;Cr=0.14。轴颈半精磨后,中频滚淬,低温回火。其金相组织,轴颈表面为回火马氏体,向芯部过渡,马氏体逐步减少。 相似文献
9.
1982年,在Kilsta Smide公司的工厂设置了大型柴油机曲轴的全自动锻压生产线,年产模锻件约30000吨。这条生产线适于锻造微合金钢零件。安装压力机的目的在于通过降低生产成本和改善尺寸公差来增强竞争力。 相似文献
10.
11.
介绍了传动轴凸缘叉锻造的改进工艺.给出了传动轴凸缘叉锻件的模具结构,并且选用相应吨位的热模锻压力机,提高了锻件尺寸精度,减少材料消耗,降低废品率.经生产实践证明切实可行,取得较好经济效益. 相似文献
12.
Zbigniew Gronostajski Marek Hawryluk Marcin Kaszuba Paweł Widomski Jacek Ziemba 《International Journal of Automotive Technology》2017,18(4):653-662
This study is focused on tools used in the industrial hot forging process of a front wheel forging (eventually–gear wheel) manufactured for the automotive industry. Four different variants were applied for the tools: 2 die inserts were coated with two different hybrid layers (GN + PVD type), i.e. AlCrTiN and AlCrTiSiN, one insert was only nitrided, and one was pad welded, to improve tool durability. The tool wear was analysed and represented by the material degradation on the working surface, based on the 3D scanning and the material growth of the periodically collected forgings. Additionally, the scanned tools were divided into two areas, in which it was found, based on the reliminary analysis, that various degradation mechanisms are predominant. Microstructural and hardness measurements of the analyzed tools were also performed. Based on the results, it was found that, in the central part of the die insert (area A), thermo-mechanical fatigue and wear occurred, while in the area of the bridge insert (area B), only abrasive wear could be observed. For these areas (A and B), the loss of material was determined separately. In area A for the inserts with hybrid layer GN+AlCrTiSiN and gas nitrided, an intensive increase of wear took place, which was not observed for the pad welded and GN+AlCrTiN layer insert, for which, together with the increase of the forging number, a proportional growth of the loss of material occurred. In area B the weakest results were obtained for the insert with GN+AlCrTiSiN layer, while wear of other die inserts grew similar and proportional. 相似文献
13.
14.
15.
16.
17.
介绍了准双曲面主动齿轮毛坯锻件工艺现状及毛坯热挤压锻件工艺过程。重点阐述了锻件变形过程、热挤压成形工艺的优点及成形时应注意的几个问题。 相似文献
18.
Cr12MoV属高碳高合金钢,强度较高,热塑变形抗力较大,变形温度区狭窄,易锻裂。锻造时要严格控制锻造温度,温度下降时立即返炉;锻打时严格执行“轻-重-轻”规律不宜过重,避免锻造变形时产生裂纹形成裂纹源;棱角要轻击倒平,避免温差和附加应力引起角裂;锻造过程中要注意观察,镦斜、拔歪要及时纠正,发现裂纹要立即去除消除裂纹源。 相似文献