scholarly journals Deposition of Nanoscopically Smooth DLC Tool Coatings for Dry Forming of Aluminum Sheets

JOM ◽  
2020 ◽  
Vol 72 (7) ◽  
pp. 2504-2510
Author(s):  
Tim Abraham ◽  
Ingmar Bialuch ◽  
Günter Bräuer ◽  
Felix Flegler ◽  
Peter Groche
Keyword(s):  
Aluminum Sheets ◽  
Dry Forming ◽  
Tool Coatings

scholarly journals Observation of the a-C:H run-in behaviour for dry forming applications of aluminium

2018 ◽  
Vol 190 ◽  
pp. 14001
Author(s):  
Tim Abraham ◽  
Günter Bräuer ◽  
Felix Kretz ◽  
Peter Groche
Keyword(s):  
Tribological Properties ◽  
Forming Process ◽  
Premature Failure ◽  
Dry Forming ◽  
Coating Roughness ◽  
Tool Performance ◽  
Coated Tool ◽  
Tool Coatings ◽  
Strip Drawing ◽  
Amorphous Hydrogenated Carbon

Amorphous hydrogenated carbon coatings (a-C:H) are well known for their exceptional tribological properties and are established as tool coatings for numerous forming applications. However, utilized in dry forming processes of aluminium a premature failure of an a-C:H coated tool often occurs due to strong adhesive wear. In this paper the run-in behaviour of a-C:H is investigated and as a possible reason for the premature tool failure evaluated. Therefore, oscillating ball-on-disc tribometer tests and strip drawing tests, for a more realistic emulation of real forming processes, will be conducted. According to these tests, the run-in period of a-C:H coatings is characterized by a high friction value and adhesion tendency and thus is decisive for the tool performance. Based on a subsequent analysis of the coating wear, the predominating wear mechanisms during the run-in period are discussed. The intrinsic nanomater-scale a-C:H roughness is identified as a crucial factor determining the tribological properties of the run-in behaviour. By reducing the coating roughness prior to the forming process, the adhesion tendency and friction value can be reduced significantly. The results demonstrate the tribological performance of pre-treated a-C:H coatings for dry sheet metal forming of aluminium EN AW-5083.

Trockenumformung strukturierter Halbzeuge aus 16MnCr5 und 42CrMo4*/Dry forming of surface structured workpiece made of 16MnCr5 and 42CrMo4 - Determination of friction shear stress by means of a pin-on-cCylinder Tribometer

2016 ◽  
Vol 106 (10) ◽  
pp. 712-718
Author(s):  
R. Hild ◽  
D. Trauth ◽  
P. Mattfeld ◽  
S. Bastürk ◽  
T. Brögelmann ◽  
...  
Keyword(s):  
Shear Stress ◽  
Metal Forming ◽  
Shear Stresses ◽  
Bulk Metal ◽  
Bulk Metal Forming ◽  
Dry Forming ◽  
Tool Coatings ◽  
Green Factory

Der Einsatz von Schmierstoffen gestattet bisher die Umformung von Massivbauteilen. In der „Green Factory“ wird auf die Verwendung dieser Schmierstoffe verzichtet. Daraus resultieren unbekannte Anforderungen an das trockene Tribosystem. Selbstschmierende Werkzeugbeschichtung und strukturierte Halbzeuge ermöglichen das trockene Tribosystem und reduzieren die Reibschubspannung. Der Fachbeitrag zeigt die Auswirkungen von Oberflächenstrukturen auf Halbzeugen auf die Reibschubspannung.   Solid and liquid lubricants enable bulk metal forming processes. In the “Green Factory”, the application of lubricants is to be avoided. The absence of lubricants results in unknown demands on a dry tribosystem. Possible enablers of the dry tribosystem are self-lubricating tool coatings and structured workpieces that lower the friction shear stresses. This contribution shows how the workpiece structuring influences the friction shear stress.

scholarly journals Forming without Lubricant – Functionalized Tool Surfaces for Dry Forming Applications

2017 ◽  
Vol 8 ◽  
pp. 533-540 ◽  
Author(s):  
Marius Herrmann ◽  
Florian Böhmermann ◽  
Henning Hasselbruch ◽  
Bernd Kuhfuss ◽  
Oltmann Riemer ◽  
...  
Keyword(s):  
Dry Forming

Influence of the microstructure of tool coatings based on Ti and Al on the blunting process during chipboard processing

2020 ◽  
Vol 112 ◽  
pp. 54-59
Author(s):  
Paweł Czarniak ◽  
Karol Szymanowski ◽  
Peter Panjan
Keyword(s):  
Multilayer Coating ◽  
Cutting Tools ◽  
Rf Magnetron Sputtering ◽  
Deposition Process ◽  
Cnc Milling ◽  
Tool Coatings ◽  
Long Time ◽  
Machine Industry ◽  
Altin Coating ◽  
Clearance Face

Influence of the microstructure of tool coatings based on Ti and Al on the blunting process during chipboard processing.This work concerns three different tool coatings containing Ti and Al. i.e. TiN, AlTiN, TiAlSiN applied to cutting tools used in the machining of wood materials. In the case of the AlTiN coating, a multilayer structure with alternately arranged AlTiN and TiN nano-layers was used. The above coatings were applied to standard replaceable knives used for CNC milling heads made of WC-Co cemented carbide. The deposition process was carried out using the RF Magnetron Sputtering method. During the measurement on a workshop microscope, the VBmax index measured on the clearance face was adopted as the wear criterion. The research proved a very good behaviour of the TiN/AlTiN multilayer coating, for which the longest average service life which was recorded exceeded the results obtained for the reference tool by about 30%. The addition of silicon, which was supposed to increase the abrasion resistance, only did not improve the durability of the blade, it actually worsened it by 6%. In addition, the coating, which has been widely used in the machine industry for a very long time, i.e. TiN, did not extend the tool life significantly (+ 7%).

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