共查询到20条相似文献,搜索用时 156 毫秒
1.
2.
为了提高扇形段的功能精度,减少铸坯内外部质量问题,通过扇形段拉杆补偿校验、扇形段驱动辊机械结构优化、扇形段装配累计误差优化、辊缝测量仪精度优化等措施,扇形段的功能精度得到了很好的控制,铸坯内部质量和表面质量得到了提高。结果表明:铸坯的中心偏析、表面质量与扇形段的功能精度有着密切的联系,对扇形段辊缝和对弧进行严格控制,能有效减少铸坯中心偏析和铸坯表面质量问题。 相似文献
3.
昆钢炼钢厂9号板坯连铸机经过多年运行后,辊列(扇形段)外弧曲线发生变化,偏离了辊列外弧曲线允许范围,导致拉坯阻力增大,严重影响连铸机的顺行。通过对辊列(扇形段)外弧曲线进行调整,将偏差控制在允许范围内,提高了设备精度,保证了连铸机的顺行。 相似文献
4.
为了提高扇形段在线使用寿命,提高连铸机功能精度和产品质量,通过分析影响400 mm厚板坯连铸机的扇形段使用寿命的原因,例如扇形段驱动辊开口度变大、扇形段驱动辊限位螺栓切断、扇形段辊缝超差大等问题,并通过一系列的优化改进解决了上述问题,结果表明:影响连铸机使用寿命的原因很多,只要找出主要关键原因并解决,就能很好地提高连铸机的使用寿命,提高铸坯的质量。 相似文献
5.
导向装置可以提高模具的导向精度,消除压力机滑块运动误差对模具运动精度的影响,从而提高模具的使用寿命和冲裁件精度,降低模具装配和调整时间。滑动导柱导套式导向装置,是模具中应用最广泛的导向装置。导柱导套式导向装置常用两付,对于大、中型冲模,冲裁工件精度高或自动化冲模,常用4副或6副。在设计大、中型冲模时常采用固定导套式和活动导套式导向装置。 相似文献
6.
7.
8.
9.
10.
11.
12.
SHIGEYOSHIHAGA HARUSHIGETSUBAKINO YASUNORIHARADA 《材料热处理学报》2004,25(5):398-400
Nowadays, in the auto industry, the need for improvement of fuel efficiency is getting increased more and more in terms of the global warming, as well as the need of light-weighting of gears, transmission parts. Hence, we‘ve studied the relation between the shot peening working conditions and factors for improvement of gear‘s fatigue life, and also the relation between the factors for improvement and the fatigue life, applying shot peening to a gear of SNCM220. Also, we examined the relation between the fatigue life and arc height that is utilized as a substitute characteristic for shot peening working conditions, adding its observation here. 相似文献
13.
14.
Sheet metal parts often have to be connected by fasteners. Within conventional process chains for the production of sheet
metal parts, fasteners like bolts are mostly welded individually after the forming process and outside the working tool. This
spatial separation of production steps requires complex handling operations and has negative impact upon the positioning accuracy
of the fasteners. Every executable manufacturing step inside the sheet metal working tool shortens the process chain significantly.
Furthermore, using a combined process the precision of position and orientation of fasteners improves. The challenges of integrating
the welding process into the sheet metal working tool are some appropriate feeding technique, handling the emissions and associated
pollutions of the tool as well as creating a dependable monitoring-system for the welding-process. Within the scope of a research
project, a reliable technology for the integration of capacitor discharge (CD) stud welding with tip ignition was developed
and tested. It complements existing solutions for integrated resistance welding processes. Due to its high-speed capability,
low insertion of energy and only needed one-sided accessibility, this technique is particularly suitable for the integration
in sheet metal working tools. A newly developed exhaustion-system is installed and tested for the first time by the CD arc
stud welding process. The new technology produced top quality welding results along with high process stability and robustness
in long-term tests. 相似文献
15.
采用相互兼顾的原则,进行中小批量的铸铁车间就地技术改造,较好地解决了工人劳动强度、作业环境、铸件质量、产量与技改投入的矛盾。 相似文献
16.
新课程改革背景下师范院校的核心理念 总被引:1,自引:0,他引:1
新一轮基础教育课程的改革,要求师范院校密切关注和了解其动态及走向,努力探索改进教师培养和培训的新思路、新形式、新内容和新方法,切实提高教师专业化的培养能力和水平。师范院校应树立以生为本的教育科学发展观的核心理念;确立育师为本的核心价值观。 相似文献
17.
V. G. Demidov 《Metal Science and Heat Treatment》1998,39(8):350-353
In recent years, a plasma method for obtaining coatings with the use of a controlled electric arc instead of an uncontrolled
welding arc has found wide application in various branches of industry. The Laboratory of Materials Science at the Institute
of Coal of the Siberian Branch of the Russian Academy of Sciences is working on the possibility of using plasma strengthening
coatings for increasing the wear resistance of parts of mining equipment. A whole spectrum of coated parts for hydraulic supports
and the equipment of concentration plants with an increased service life and wear resistance has been suggested.
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 26–28, August, 1997. 相似文献
18.
在分析GTAW弧长自动变化特征的基础上,设计了自动稳定弧长的控制器。其特点是既以保证跟踪精度,又不至于频敏调节焊枪。由于采取了可变窗口宽度的措施,因而能有效地避免焊枪的纠差振荡。控制器结构简单,调试方便。弧长取样部分采取了线性光电隔离措施,提高了系统可靠性。 相似文献
19.
20.
为提升路面洗扫机械的水箱在服役过程中的可靠性,针对水箱中防波板焊接结构在水流冲击载荷下出现疲劳裂纹失效问题,在立板根部采用圆弧过渡的结构优化方案,以降低焊接结构的应力集中程度,从而提升防波板的使用寿命。采用有限元仿真系统地分析了过渡圆弧位置和半径对应力分布的影响规律。仿真结果表明,焊接结构应力集中导致防波板抗疲劳性能弱化,而圆弧过渡结构对应力集中效应具有明显的缓解作用,其缓解程度与圆弧位置和半径有显著的关联。随着圆弧与焊道距离的减小或者圆弧半径的增加,防波板应力集中降低,载荷由低周疲劳向高周疲劳的转变越明显。 相似文献