The influence of process parameters and sheet material on the temperature development in the forming zone

Cold metal forming is a fast and economical way of producing a wide range of precise components. Its profitability mainly depends on part quality, process stability, and service intervals of tools. As these factors are all determined by tool wear, detailed process knowledge is indispensable to maximize profitability by minimizing wear. One of the most crucial factors in this context is temperature. During every forming process, a temperature rise occurs between tool and workpiece due to frictional heating and a large part of plastic work dissipating into heat. This phenomenon affects the whole forming process but especially tool wear. Currently, there is little solid information about temperatures occurring during forming operations. Therefore, the temperature was measured based on varying process parameters, sheet materials, and thicknesses in several embossing and blanking examinations. The use of a tool–workpiece thermocouple enabled accurate and instantaneous measurement during the process. The results presented show the strong influence of process and material parameters on temperatures in the forming zone

The influence of process parameters on the temperature development in the forming zone

Cold metal forming is a fast and economical way of producing a wide range of precise components. Its profitability mainly depends on part quality, process stability and service intervals of tools. As these factors are all determined by tool wear, detailed process knowledge is indispensable to maximize profitability by minimizing wear. One of the most crucial factors in this context is temperature. During every forming process, a temperature rise occurs between tool and workpiece due to frictional heating and a large part of plastic work dissipating into heat. This temperature affects the whole forming process but especially tool wear. Currently, there is little solid information about temperatures occurring during forming operations. Therefore, the temperature was measured based on varying process parameters in several embossing and blanking examinations. The use of a tool-workpiece-thermocouple enabled accurate and instantaneous measurement during the process. The results presented show the strong influence of process parameters on temperatures in the forming zone

Talent Development in Achievement Domains: A Psychological Framework for Within- and Cross-Domain Research

Achievement in different domains, such as academics, music, or visual arts, plays a central role in all modern societies. Different psychological models aim to describe and explain achievement and its development in different domains. However, there remains a need for a framework that guides empirical research within and across different domains. With the talent-development-in-achievement-domains (TAD) framework, we provide a general talent-development framework applicable to a wide range of achievement domains. The overarching aim of this framework is to support empirical research by focusing on measurable psychological constructs and their meaning at different levels of talent development. Furthermore, the TAD framework can be used for constructing domain-specific talent-development models. With examples for the application of the TAD framework to the domains of mathematics, music, and visual arts, the review provided supports the suitability of the TAD framework for domain-specific model construction and indicates numerous research gaps and open questions that should be addressed in future research

Lubricant-free forming by affecting thermoelectric currents

AbschlussberichtCold metal forming belongs to the most important manufacturing processes for sheet metal mass products. To meet increasing requirements concerning part quality and economic efficiency, tool wear has to be minimized. Therefore, most of the forming processes are only feasible with lubricant application. Especially for processes with high tool load, such as blanking or embossing, adhesive wear is a key challenge due to early initiation and high wear rates. Despite the high significance and consequences, like a reduction of part quality and process reliability as well as an increasing risk of severe tool damage, wear-causing interactions are insufficiently understood. One known influencing factor is the temperature in the forming zone, which arises due to the dissipation of conducted forming work. Besides the direct impact on adhesive wear, this temperature rise leads to thermoelectric voltages and currents, whose influence on adhesive wear development has been neglected so far. For this reason, typical tool and sheet materials have been characterized for the first time with regard to their thermoelectric behavior, represented by the Seebeck coefficient. Together with experimental blanking and embossing investigations, basic correlations between process parameters, temperatures, sheet and tool materials, thermoelectric currents as well as adhesive wear could be derived. The findings obtained confirm a strong influence of the direction and strength of thermoelectric currents, which are determined by the difference between the Seebeck coefficients of tool and sheet material, on adhesive wear. Similar thermoelectric behavior of both materials in contact suppresses thermocurrents and resulted in an adhesive wear reduction of 74% during blanking. In addition, the external generation of a regulated current enables to influence thermoelectric currents in strength and direction. An external current adapted to the process reduced adhesive wear by 31%. In sum, two new methods of adhesive wear reduction, which are applicable in every metal manufacturing process, were investigated within this project. Furthermore, the knowledge gained improves the fundamental understanding of wear-causing interactions.31633

The influence of process parameters and sheet material on the temperature development in the forming zone

Cold metal forming is a fast and economical way of producing a wide range of precise components. Its profitability mainly depends on part quality, process stability, and service intervals of tools. As these factors are all determined by tool wear, detailed process knowledge is indispensable to maximize profitability by minimizing wear. One of the most crucial factors in this context is temperature. During every forming process, a temperature rise occurs between tool and workpiece due to frictional heating and a large part of plastic work dissipating into heat. This phenomenon affects the whole forming process but especially tool wear. Currently, there is little solid information about temperatures occurring during forming operations. Therefore, the temperature was measured based on varying process parameters, sheet materials, and thicknesses in several embossing and blanking examinations. The use of a tool–workpiece thermocouple enabled accurate and instantaneous measurement during the process. The results presented show the strong influence of process and material parameters on temperatures in the forming zone

The influence of process parameters on the temperature development in the forming zone

Cold metal forming is a fast and economical way of producing a wide range of precise components. Its profitability mainly depends on part quality, process stability and service intervals of tools. As these factors are all determined by tool wear, detailed process knowledge is indispensable to maximize profitability by minimizing wear. One of the most crucial factors in this context is temperature. During every forming process, a temperature rise occurs between tool and workpiece due to frictional heating and a large part of plastic work dissipating into heat. This temperature affects the whole forming process but especially tool wear. Currently, there is little solid information about temperatures occurring during forming operations. Therefore, the temperature was measured based on varying process parameters in several embossing and blanking examinations. The use of a tool-workpiece-thermocouple enabled accurate and instantaneous measurement during the process. The results presented show the strong influence of process parameters on temperatures in the forming zone

Influence of Shear Cutting Process Parameters on the Residual Stress State and the Fatigue Strength of Gears

This is a pre-print of an article not yet published. The final authenticated version is available online 2021