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431570026160

基本信息

批准号：
60850023
负责人：
SHIMA Susumu
金额：
$ 7.23万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850023/
关键词：
metal forming tribology friction test temperature rise size effect on friction ceramic tool antiwear 耐焼付き性摩擦試験摩耗試験摩擦発熱極圧添加剤摩擦と寸法効果

项目摘要

Metal forming processes are quite dependent on the choice of tool material and lubricant. For choosing appropriate combination of them, we have developed a new testing method for testing friction coefficient, sticking and tool wear. In this project, particular attention was paid to (1) temperature effect and (2) size effect of tool-workpiece interface on friction and also to feasibility study of ceramic materials for metal forming tools by wiredrawing.For the temperature effect and size effect, it was experimentally and theoretically confirmed that the temperature rise at the tool-surface is dependent on the size of the interface. An analytical method of predicting friction coefficient was thus developed; the analysis involves temperature and pressure sensitivity of the viscosity of the lubricant, thermal properties of the tool and workpiece materials and also a relationship between the friction coefficient and the thickness of the lubricant introduced into the gap between the tool and workpiece surfaces. The objectives of the project were by and large reached. However, the simulation of the various actual metal forming processes has yet to be undertaken as a future work; the knowledge on the thermal conditions for actual processes will be needed. Also, since the relationship between the friction coefficient and the lubricant film thickness was a first approximation, this should be investigated further in detail.The feasibility study of ceramic materials was also quite satisfactory. It was confirmed that silicon carbide is the best in view of friction coefficient, antiwear and antisticking; silicon nitride follows nest and zirconia the third. In this project, wire drawing was employed as a test method. It is also of importance to examine the feasibility in various forming processes.

金属成形过程很大程度上取决于刀具材料和润滑剂的选择。为了选择合适的组合，我们开发了一种新的测试摩擦系数、粘着和刀具磨损的测试方法。在本项目中，特别关注了(1)温度效应和(2)工具-工件界面对摩擦的尺寸效应，并对金属拉丝成形工具陶瓷材料的可行性进行了研究。对于温度效应和尺寸效应，通过实验和理论验证了刀具表面的温升与界面尺寸有关。提出了一种预测摩擦系数的解析方法；该分析涉及润滑剂粘度的温度和压力敏感性，工具和工件材料的热性能以及摩擦系数与引入到工具和工件表面之间间隙的润滑剂厚度之间的关系。该项目的目标基本上达到了。然而，各种实际金属成形过程的模拟尚未作为未来的工作进行；需要了解实际工艺的热条件。此外，由于摩擦系数与润滑膜厚度之间的关系是一级近似，因此应进一步详细研究。陶瓷材料的可行性研究也令人满意。从摩擦系数、抗磨性和防粘性等方面证实碳化硅是最佳材料；氮化硅紧随其后，氧化锆位居第三。在这个项目中，采用拉丝作为测试方法。检验各种成形工艺的可行性也很重要。