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Modling, Austria

With investments in heat treatment plants, the principal question, if the production is carried out continuously or batch-wise, is clarified mostly at the beginning. Selection of the production principle finally depends on various single factors and has to be evaluated differently according to process and heat treatment material. Furthermore, the decision has to be met before an investment, whether the products shall/must be heat treated under protective gas or in open atmosphere. By means of isothermal annealing of forging parts, this decision process is discussed. There, plant concepts for discontinuous and continuous plants are presented, the single advantages and disadvantages are illustrated, and a cost comparison of continuous and discontinuous plants as well as with application of protective gas or without protective gas is carried out. Source


Goy W.,EMA Indutec GmbH | Altena H.,Aichelin GmbH
HTM - Journal of Heat Treatment and Materials | Year: 2016

Within the classical gearbox manufacturing of an automotive company, heat treatment as a production step between soft and hard machining will mostly be located in a separate hardening area with transport of work pieces between the processing stations. In our fast-moving world, increasing flexibility and shorter lead times are called for, entailing a reduction of intermediate buffers in the production process and full integration of heat treatment into the production line. This paper outlines different solutions of a stepwise transition from a centralized hardening shop to integration of heat treatment in a line process. Ideally, this would be a conversion of the complete work process to a so-called "one-piece-flow". Heat treatment by induction is the ideal way for the manufacture of individual parts and thus perfectly suited for one-piece-flow production. Both individual inductive process steps, hardening and tempering, are described in detail and compared with conventional heat treatment. Terms and conditions for a switch-over to inductive short-time processes are presented and explained. Finally, this paper provides an outlook for future developments with regard to heat treatment as an integral element of the production line. © 2016 Carl Hanser Verlag GmbH & Co. KG. Source


Altena H.,Aichelin GmbH
International Heat Treatment and Surface Engineering | Year: 2013

This invited paper gives an overview of the process and furnace technology of controlled atmosphere furnaces and the requirements of European customers. Based on typical parts that are heat treated in atmosphere furnaces, the commonly used furnace types and their mechanical design (refractory, burners, etc.) are explained. Furthermore the required atmosphere and process control are mentioned, which is in direct correlation with the preferably used thermal and thermochemical processes. Finally quenching processes and the design of quenching devices will be discussed. An outlook to future developments of atmosphere furnaces will complete the paper. In this outlook the energy efficiency, primary measures for energy savings, and also energy recovery have a high priority and are very important to the European view in general. © 2013 IHTSE Partnership. Source


Atmospheric furnaces are 'state of the art" for case hardening of transmission gear parts for the automotive industry. Increased demands concerning the reduction of process time, reduced heat treatment costs and improved energy efficiency can be met by technical and technological innovations. This paper shows different aspects of time and cost savings for heat treatment of gear parts. Furthermore different energy efficiency measures for continuous furnaces are recommended including energy savings and energy recovery. Source


Altena H.,Aichelin GmbH
Proceedings - European Conference on Heat Treatment and 21st IFHTSE Congress | Year: 2014

Conventional atmospheric furnaces are "state of the art" for case hardening of transmission gear parts for the automotive industry. Many customers appreciate the advantages of atmospheric furnaces, like low heat treatment costs, high availability of the furnace, good reproducibility of the heat treatment results, process control via oxygen probe, etc. Increased demands concerning the reduction of process time, reduced heat treatment costs and improved energy efficiency can be met by technical and technological innovations. This paper shows different aspects of time and cost savings for heat treatment of gear parts. Source

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