全文获取类型
收费全文 | 444篇 |
免费 | 15篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 14篇 |
综合类 | 18篇 |
化学工业 | 29篇 |
金属工艺 | 127篇 |
机械仪表 | 158篇 |
建筑科学 | 6篇 |
矿业工程 | 6篇 |
能源动力 | 6篇 |
轻工业 | 7篇 |
石油天然气 | 4篇 |
武器工业 | 3篇 |
无线电 | 10篇 |
一般工业技术 | 42篇 |
冶金工业 | 13篇 |
自动化技术 | 21篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 7篇 |
2021年 | 6篇 |
2020年 | 7篇 |
2019年 | 6篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 10篇 |
2015年 | 15篇 |
2014年 | 40篇 |
2013年 | 32篇 |
2012年 | 35篇 |
2011年 | 20篇 |
2010年 | 25篇 |
2009年 | 28篇 |
2008年 | 11篇 |
2007年 | 28篇 |
2006年 | 29篇 |
2005年 | 15篇 |
2004年 | 35篇 |
2003年 | 27篇 |
2002年 | 24篇 |
2001年 | 21篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1996年 | 2篇 |
1995年 | 2篇 |
1994年 | 2篇 |
排序方式: 共有464条查询结果,搜索用时 562 毫秒
1.
C. S. Lim P. Eng S. C. Lin C. K. Chua Y. T. Lee 《The International Journal of Advanced Manufacturing Technology》2002,20(1):44-49
Rapid prototyping (RP) and rapid tooling (RT) techniques can be applied to the field of medicine primarily because of their
ability to produce customised profiles and geometries in relatively short lead times. In this paper, the process by which
these techniques can be applied for the production of customised tracheobronchial stents for the purpose of maintaining patency
in an occluded respiratory tract is described. A comparison of RP systems was carried out to establish the preferred RP method
to produce the master model. The vacuum casting RT process was then used to produce the stent. 相似文献
2.
运用转子平衡理论,对工具系统实施平衡技术时,分析了校正面数量的选择、校正面位置的确定、平衡方法的选择等平衡工艺的主要方面,为工具系统的合理设计、制造和使用提供指导. 相似文献
3.
高速精密加工工具系统现状与探讨 总被引:2,自引:0,他引:2
综述了新型工具系统的发展过程、特点及应用情况 ,着重分析了HSK工具系统的刚度和承载能力、夹紧力、动平衡、测量技术、材料和热处理等几个关键问题 ,指出了尚待解决的一些重要问题 ,提出了今后研究的途径以及我国开发高速加工工具系统时应采取的策略。 相似文献
4.
5.
6.
7.
Advances in fabricating superplastically formed and diffusion bonded components for aerospace structures 总被引:1,自引:0,他引:1
Larry D. Hefti 《Journal of Materials Engineering and Performance》2004,13(6):678-682
Superplastic forming and diffusion bonding (SPF/DB) production hardware is being fabricated today for aerospace applications.
Metal tooling is being used to bring the titanium sheets into contact so diffusion bonding can occur. However, due to material
sheet and tooling tolerances, good bond quality is difficult to achieve over large areas. A better method for achieving DB
is to use “stop-off” inside sealed sheets of titanium, which constitutes a pack, and then the pack is bonded using external
gas pressure. A good method for heating the pack for this process is to use induction heating. Components using “stop-off”
that were diffusion bonded first and then superplastically formed have shown much better bond quality than components that
were produced using matched metal tooling. This type of tooling has been successful at bonding small areas as long as the
exerted pressure is concentrated on the area where bonding is required. Finite element modeling is providing weight effect
solutions for titanium SPF/DB aerospace structures.
This paper was presented at the International Symposium on Superplasticity and Superplastic Forming, sponsored by the Manufacturing
Critical Sector at the ASM International AeroMat 2004 Conference and Exposition, June 8–9, 2004, in Seattle, WA. The symposium
was organized by Daniel G. Sanders, The Boeing Company. 相似文献
8.
9.
介绍了国内首台万吨铝挤压机关键零部件主柱塞的加工工艺 ,以及在大型卧式车床上加工大直径、高光洁度阶梯深孔、盲孔的加工方法及工艺流程和所需工装设计等。 相似文献
10.
The structure of parts produced by stereolithography injection mould tools and the effect on part shrinkage 总被引:1,自引:0,他引:1
R. A. Harris R. J. M. Hague P. M. Dickens 《International Journal of Machine Tools and Manufacture》2004,44(1):59-64
Stereolithography (SL) tooling for plastic injection moulding provides a low cost and quick alternative to hard tooling methods when producing a small quantity of parts. However, work by the authors has shown that a different rate of polymer shrinkage was experienced in semi-crystalline parts when produced from SL moulds as compared to those from conventional metal tooling methods. Different shrinkage means the parts are not truly the same as those that would be produced by metal tooling and highlights a disadvantage to SL tooling.This work associates the increased shrinkage experienced to a greater percentage crystallinity developed in the parts due to their thermal history during processing. In these experiments the cooling rate, which is imparted due to the heat transfer characteristics of the mould has been identified as the controlling factor of a parts % crystalline content and the cause of shrinkage anomalies.The morphology analysis results show that there is 30% more crystallinity developed in the nylon (PA66) parts produced in SL moulds than those produced from aluminium moulds. The results also reveal different characteristics during thermal analysis that may also be due to the thermal history imparted by the mould.The work utilises the thermal analysis technique differential scanning calorimetry (DSC) to quantify the different levels of crystallinity in the parts. The thermal characteristics of the mould are demonstrated by real-time data acquisition. 相似文献