Interaction of heat generation and material behaviour in sheet metal blanking

Demmel, Peter; Hoffmann, Hartmut; Golle, Roland; Intra, Carsten; Volk, Wolfram

doi:10.1016/j.cirp.2015.04.091

Cited by 23 publications

(10 citation statements)

References 9 publications

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“…The temperature rise strongly influences the process. Material behaviour [4] and tool wear are just two examples. Furthermore, temperature is a decisive factor in the choice of tool coatings and lubricants [5].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…During sheet metal blanking, the work-piece material and the punch are exposed to different stress conditions which cause the cutting edge of the punch to undergo elastic and plastic deformation that affects the working capability of the punch [23]. In addition, after 800 strokes, the increase in heat needed to generate chemical reactions between oxygen in air and the elements in the coating could favor the formation of hard surface oxides, which could result in delamination by corrosive wear.…”

Section: Blanking Punch Testmentioning

confidence: 99%

Properties and in-service performance of components reated with thermo reactive deposition/diffusion

Marulanda

Toro

Castillejo

et al. 2018

Ingeniare. Rev. chil. ing.

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Properties and in-service performance of components reated with thermo reactive deposition/diffusionPropiedades y desempeño en servicio de componentes tratados con deposición/difusión termorreactiva ABSTRACT Machine components and tools subjected to aggressive environments and strong wear conditions need surfaces with good mechanical properties. The thermo-reactive deposition/diffusion (TRD) process is one of the methods used for improving the mechanical properties of these components and tools, mainly because of its low cost and good performance of the coatings deposited. Although the TRD process is widely used for coating dies, extrusion tools and punches among others, the in-service performance of cutting tools coated using the TRD process has not been extensively studied. In this study, niobium carbide coatings were deposited on cutting punches and screw taps using the TRD technique. Phase formation and micro-hardness of the coatings were studied using X-ray diffraction and Vickers measurements respectively, and the in-service performance of the coated and uncoated tools was studied through field tests conducted at different numbers of cuts. The results show that the coating significantly improves the wear resistance and the cutting performance of the tools, especially at higher numbers of cuts. RESUMENLos componentes de maquinaria y las herramientas sujetas a ambientes agresivos y fuertes condiciones de desgaste necesitan superficies con buenas propiedades mecánicas. El proceso de deposición/difusión termorreactiva (TRD) es uno de los métodos usados para mejorar las propiedades mecánicas de estos componentes y herramientas, principalmente por su bajo costo y buen desempeño de los recubrimientos depositados. Aunque el proceso TRD es ampliamente usado para recubrir moldes, herramientas de extrusión y punzones entre otros, el desempeño en servicio de herramientas de corte recubiertas usando el proceso TRD no ha sido estudiado extensamente. En este estudio se depositaron recubrimientos de carburo de niobio sobre punzones de corte y machos de roscado usando la técnica TRD. La formación de fases y la microdureza de los recubrimientos se estudió usando difracción de rayos X y dureza Vickers

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“…Consequently, thermoelectric currents occur during every sheet metal manufacturing process because of a temperature increase in the forming zone. Three effects cause this temperature increase: One is the dissipation of up to 95% of the plastic deformation work into heat, 11,12 with only a minor amount stored in dislocations and other lattice defects. 13 Another reason is macroscopic friction, and the last one is microscopic friction on the atomic level.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectrically Based Approaches to Reduce Adhesive Wear During Blanking

Welm

Tröber

Weiß

et al. 2020

JOM

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Almost every metal mass product goes through a blanking process. Especially when processing aluminum, adhesive wear is the main determinant of cost efficiency. Many investigations on wear-influencing factors have been conducted so far, but one major determinant is almost unnoticed, thermoelectric phenomena. Due to the Seebeck effect, thermoelectricity arises in every blanking tool. Recently published investigations show that the combination of tool and workpiece materials has a strong influence on occurring thermoelectric currents and thus on adhesive wear development. This can be traced back to dependence of the current strength and direction on the materialspecific Seebeck coefficient. This article addresses the same phenomenon for a new parameter spectrum. Blanking experiments with aluminum EN AW 5083 were performed, investigating both thermoelectric currents and the amount of adhesive wear. Furthermore, the impact of external currents influencing the naturally occurring thermoelectricity on wear is shown. Improved measurements with a laser confocal microscope reveal a close correlation between the thermoelectric current profiles and adhesive wear pattern on the lateral surface of the punch. Together with a variation of tool material among highspeed steel 1.3343, stainless steel 1.4301 and cemented carbide CF-H40S, a strong relation between the Seebeck coefficients, electrical currents and tool wear could be found. Therefore, the actual findings confirm, deepen and extend previous results concerning thermoelectricity and adhesive wear.

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Interaction of heat generation and material behaviour in sheet metal blanking

Cited by 23 publications

References 9 publications

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

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

Properties and in-service performance of components reated with thermo reactive deposition/diffusion

Thermoelectrically Based Approaches to Reduce Adhesive Wear During Blanking

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