Performance increase of metal bonded CBN tools by cryogenic cooling

通过低温冷却提高金属结合剂 CBN 工具的性能

• 批准号: 405337217
• 负责人: Professor Dr. Bernd Breidenstein, since 7/2019
• 金额: --
• 依托单位: Institut für Fertigungstechnik und Werkzeugmaschinen (IFW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/405337217?language=en
• 关键词: Performance; increase; metal; bonded; CBN

Compared to conventional tools, metal bonded CBN grinding wheels possess an increased thermal conductivity and therefore offer the potential to alter the heat balance during grinding in benefit of a lower workpiece temperature. A lower heat input into the part results in an improved part quality and enables an increase in productivity. The technology of cooling with cold media (cryogenic cooling) offers the potential to increase the temperature difference between workpiece and tool and thereby to enhance the heat dissipation from the contact zone and the performance potential of metal bonded CBN tools. The influence of the cooling temperature on the chip formation, the resultant heat generation and heat distribution is not sufficiently known. For these reasons the aim of the proposed project is to identify the technological background for an increase in productivity of metal bonded CBN grinding tools by implementation of cryogenic cooling. The innovative approach is to specifically influence the heat balance of the grinding process by using cold media. Thereby the temperature of the grinding wheel can be lowered and consequently more heat will migrate into the tool. This aim contributes to a better understanding of the grinding process on a scientific level. Based on this fundamental understanding the potential of the much discussed technology of cryogenic cooling can be evaluated scientifically. The use of metal bonded CBN tools is not very common until today, because the advantages that could balance out the high acquisition costs of these tools are not fully quantifiable yet. For thermally critical processes like the profile grinding of steel in the gearing manufacturing the possibility to significantly increase productivity and economic efficiency is facilitated.

与传统工具相比，金属结合剂CBN砂轮具有更高的导热性，因此有可能在磨削过程中改变热平衡，从而降低工件温度。输入到零件中的热量越少，零件质量越高，生产率也就越高。冷介质冷却技术（低温冷却）提供了增加工件和工具之间温差的潜力，从而提高接触区的散热能力和金属结合剂CBN工具的性能潜力。冷却温度对切屑形成的影响、由此产生的热生成和热分布还不十分清楚。由于这些原因，拟议项目的目的是确定通过实施低温冷却来提高金属结合剂CBN磨具生产率的技术背景。创新的方法是通过使用冷介质来专门影响研磨过程的热平衡。因此，可以降低砂轮的温度，并且因此更多的热量将迁移到工具中。这一目标有助于在科学水平上更好地理解研磨过程。基于这一基本认识，可以科学地评估备受讨论的低温冷却技术的潜力。直到今天，金属结合CBN工具的使用还不是很普遍，因为可以平衡这些工具的高采购成本的优势还没有完全量化。对于热关键工艺，如齿轮制造中的钢的轮廓磨削，可以显著提高生产率和经济效率。