Knowledge transfer for the development and optimization of bonded, vibration-damping joints for single-lip drills, extended by aspects of practicality with regard to production and use of tools

• Applicant: Professor Dr.-Ing. Hans Christian Möhring
• Subject Area: Metal-Cutting and Abrasive Manufacturing Engineering
• Term: from 2019 to 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 423192843

Bonding is an alternative approach to apply cutting materials to basic tool bodies Compared to brazing, the time required for bonding is higher. This can only be justified if the correspondingly joined tools have additional functionalities. Using bonded joints, it is possible to design them regarding to specified vibration damping properties or as overload clutch to avoid tool breakage depending on too high drilling torques. The work planned in the research project is therefore concerned with studies on the design and capabilities of bonded joints.The following items will be worked out in close cooperation with the project partner Guehring KG: Identification of adhesive systems suitable for damping shank-sleeve connections in tools used within single-edge deep hole drilling operations. Conception, development and construction of a device for joining shaft-sleeve connections at room and oven temperature while maintaining the required accuracy requirements. Development of a measuring method for the quantification of position errors on tools with bonded joint. Optimization of the joining process with regard to the adhesive system and the dimensioning of the joint. Experimental and simulation-based acquisition and evaluation of the static and dynamic behavior of bonded tools compared to brazed reference tools. Investigation and evaluation of the usability in machining. Assessment of the resistance of the bonded joint against cooling lubricants and investigations into the applicability in coating plants.The aim of the research project is to gain insights into suitable adhesive systems as well as the geometrical design of the joint to produce prototypical damped tool samples with sufficient strength. The bonded tools operational capability shall be demonstrated under the requirements of customary machining operations in comparison to brazed reference tools.

• DFG Programme: Research Grants (Transfer Project)
• Application Partner: Gühring KG; Geschäftsbereich Forschung & Entwicklung
• Co-Investigator: Dr.-Ing. Thomas Stehle