Locally Adapted Tribological Conditions as a Method for Influencing the Material Flow in Sheet-Bulk Metal Forming Processes

Loeffler, M.; Schneider, Thomas; Vierzigmann, Ulrich; Engel, Ulf; Merklein, Marion

doi:10.4028/www.scientific.net/kem.639.267

Cited by 7 publications

(5 citation statements)

References 6 publications

(15 reference statements)

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“…The experimental verification, shown in Fig. 9b, revealed an increase of the cup height by 0.25 mm and a 2.13% improvement of the die filling for the DC04 sheet by using workpiece-sided abrasive blasting on both sided of the investigated samples [31]. Thus, the increase of the friction in the area of the cup bottom decreased the material flow directed to this area and extends the limits for this kind of SBMF process.…”

Section: Locally Adapted Tribological Conditions As a Methods To Influmentioning

confidence: 83%

Sheet-bulk metal forming – forming of functional components from sheet metals

Merklein

Gröbel

Löffler

et al. 2015

MATEC Web of Conferences

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Abstract. The paper gives an overview on the application of sheet-bulk metal forming operations in both scientific and industrial environment. Beginning with the need for an innovative forming technology, the definition of this new process class is introduced. The rising challenges of the application of bulk metal forming operations on sheet metals are presented and the demand on a holistic investigation of this topic is motivated. With the help of examples from established production processes, the latest state of technology and the lack on fundamental knowledge is shown. Furthermore, perspectives regarding new research topics within sheet-bulk metal forming are presented. These focus on processing strategies to improve the quality of functional components by the application of processadapted semi-finished products as well as the local adaption of the tribological system.

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Section: Locally Adapted Tribological Conditions As a Methods To Influmentioning

confidence: 83%

Sheet-bulk metal forming – forming of functional components from sheet metals

Merklein

Gröbel

Löffler

et al. 2015

MATEC Web of Conferences

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“…The use of tubular belt conveyors for transportation of man-made goods is considered in works [1,2]. In particular, paper [1] investigates steeply inclined tubular belt conveyors with incomplete filling of the belt with cargo.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…It is impossible for conventional belt conveyors to move materials at angles when the lifting component exceeds the friction forces holding on the belt. In place of conventional belt conveyors, belt tubular conveyors are proposed [1][2][3][4][5]. Such conveyors can move materials not only at high angles but also be used for the spatial configuration of the track with bends in the horizontal and vertical planes at the same time.…”

Section: Introductionmentioning

confidence: 99%

Establishing regularities in the transportation of concrete with coarse filler by a tubular belt with partitions

Gavryukov

Трет’як

Zapryvoda

et al. 2023

EEJET

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This paper reports a study into the holding capacity of tubular belt with partitions of a mixture of concrete and the effect of the technique of loading the tubular belt on increasing the pressure of the material on the partition. The task solved was the establishment of regularities in the process of transporting concrete with coarse aggregate and, on their basis, the determination of the structural and technological solution. The studies have shown that the use of transverse partitions significantly increases the holding capacity of the load by a tubular belt and makes it possible to transport concrete with coarse filler. It has been experimentally proved that when using the belt with transverse grooves Reef-1, the force of cargo on the partition is several times less than when using a smooth belt. The force of the load on the partition can be reduced if loading takes place on a horizontal or slightly inclined surface of the belt. The properties of the load and the height of the layer of material loaded into the tubular belt significantly affect the force arising on the partition. With the height of the layer of material to be loaded, the force increases to a certain limit, which depends on the initial resistance to the shift of the material, after which it remains constant. Based on the results, plots of the dependence of the force on the partition on the angle of inclination of the belt and the weight of the material were constructed. The operability based on specific initial (numerical) data of the derived theoretical dependences describing the efforts of the above-placed layers of material on the partition located in the tubular belt has been experimentally confirmed. The methodology of research and design of experimental benches for measuring the load on the partition of tubular belt conveyors was refined. The results make it possible to consider the construction of a crane ‒ a concrete dispenser equipped with a tubular belt conveyor with partitions for the construction of high-rise structures

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“…The inner cut-out is utilized for the positioning of the parts. The length of a process chain can influence the economic efficiency of production [13]. Usually, short process sequences are preferred in forming [14], therefore the workpieces in forward and lateral extrusion are formed in one stroke.…”

Section: Process Layout and Comparisonmentioning

confidence: 99%

Extension of the forming limits of extrusion processes in sheet-bulk metal forming for production of minute functional elements

Pilz¹,

Henneberg²,

Merklein³

2020

Manufacturing Rev.

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Increasing demands in modern production pose new challenges to established forming processes. One approach to meet these challenges is the combined use of established process classes such as sheet and bulk forming. This innovative process class, also called sheet-bulk metal forming (SBMF), facilitates the forming of minute functional elements such as lock toothing and gear toothing on sheet-metal bodies. High tool loads and a complex material flow that is hard to control are characteristic of SBMF. Due to these challenging process conditions, the forming of functional elements is often insufficient and necessitates rework. This negatively affects economic efficiency. In order to make use of SBMF in industrial contexts, it is necessary to develop measures for improving the forming of functional elements and thereby push existing forming boundaries. This paper describes the design and numerical replication of both a forward and a lateral extrusion process so as to create involute gearing in combination with carrier teeth. In a combined numerical-experimental approach, measures for extending the die filling in sheet-metal extrusion processes are identified and investigated. Here, the focus is on approaches such as process parameters, component design and locally adjusted tribological conditions; so-called 'tailored surfaces'. Based on the findings, fundamental mechanisms of action are identified, and measures are assessed with regard to their potential for application. The examined approaches show their potential for improving the forming of functional elements and, consequently, the improvement of geometrical accuracies in functional areas of the workpieces. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Locally Adapted Tribological Conditions as a Method for Influencing the Material Flow in Sheet-Bulk Metal Forming Processes

Cited by 7 publications

References 6 publications

Sheet-bulk metal forming – forming of functional components from sheet metals

Sheet-bulk metal forming – forming of functional components from sheet metals

Establishing regularities in the transportation of concrete with coarse filler by a tubular belt with partitions

Extension of the forming limits of extrusion processes in sheet-bulk metal forming for production of minute functional elements

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