Geklebte Keramiken im unterbrochenen Schnitt/Adhesive bonded ceramics in intermittent cutting – Investigation of circular sawing of grey cast iron with adhesively bonded ceramic teeth

2021 ◽  
Vol 111 (01-02) ◽  
pp. 65-70
Author(s):  
Michael Stroka ◽  
Sascha Stribick ◽  
Moritz Kolb
Keyword(s):  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Adhesively Bonded ◽  
Circular Saw ◽  
Ceramic Surfaces ◽  
Grey Cast ◽  
Circular Sawing ◽  
And Behavior ◽  
Intermittent Cutting

Der Beitrag beschreibt, wie Verbundkreissägeblätter mit geklebten keramischen Zähnen hergestellt wurden. Dafür wurden die Keramiken, aufbauend auf bisherigen eigenen Untersuchungen, mittels Laseroberflächenstrukturierung vorbehandelt und mit einem modifizierten Lötautomaten verklebt. Anschließend wurden die Werkzeuge geschliffen und in einem Modellversuch auf ihre Funktionsfähigkeit und Einsatzverhalten untersucht.   This article presents the manufacturing of adhesively bonded circular saw blades with ceramic teeth. Based on own previous investigations, the ceramic surfaces were treated by laser surface texturing and adhesively bonded by a modified brazing machine. Then the tools were grinded and functioning and behavior were validated in a model experiment.

Geklebte Schneidsegmente im unterbrochenen Schnitt*/Adhesively bonded cutting segments in intermittent cutting – Examples for their application in circular sawing of aluminum

2018 ◽  
Vol 108 (06) ◽  
pp. 466-472
Author(s):  
M. Stroka ◽  
F. Schumpp ◽  
M. Schneider
Keyword(s):  
Stress State ◽  
Experimental Investigations ◽  
Turning Process ◽  
Adhesively Bonded ◽  
The Real ◽  
Circular Saw ◽  
Circular Sawing ◽  
Sawing Process ◽  
Intermittent Cutting ◽  
Model Approach

Der Beitrag stellt Untersuchungen zu geklebten Schneidsegmenten für Kreissägeanwendungen vor. Die tatsächliche Beanspruchung des Sägeprozesses wird dabei durch einen Modellversuch abgebildet, der den Sägeprozess auf einen Drehprozess mit unterbrochenem Schnitt überträgt. So können mit geringem Aufwand vereinfachte, geklebte Proben in der Zerspanung anwendungsbezogen untersucht werden. Die Versuche wurden mit hartmetallbestückten Proben an Aluminiumwerkstücken durchgeführt.   The article presents experimental investigations of adhesively bonded cutting segments for circular saw blades. The real stress state is reproduced by a model approach which transfers the sawing process to a turning process with intermittent cutting. This allows for easily investigating the use of adhesively bonded specimens in machining. The experiments were performed with carbide-tipped specimens on aluminum workpieces.

Improving Tribological Behavior of ICE’s Cylinder Surface by Laser Surface Texturing (LST)

2021 ◽  
Vol 7 (2) ◽  
pp. 9-16
Author(s):  
K. Tripathi ◽  
S. W. Lee
Keyword(s):  
Coefficient Of Friction ◽  
Combustion Engine ◽  
Wear Behavior ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Cylinder Surface ◽  
Viscous Oil ◽  
The Coefficient Of Friction ◽  
Grey Cast

This study investigates the effect of laser surface texturing (LST) on the friction and wear behavior of grey cast iron (GCI) of internal combustion engine (ICE) cylinder in lubricated conditions. The dimples having diameter of about (58-60) μm and depth of about 10 μm were created on the surface with various dimple densities ranging from 5 to 50%. A ball-on-disc friction tests were performed for all the specimens under 5W30 and 15W50 oils with different viscosities. The tests were carried out at a load of 5N and speed of 5cm/s. The coefficient of friction of the dimpled specimen was reduced significantly by approximately 32% as compared to the polished speciemen. Specimen with 15% dimples exhibits the lowest coefficient of friction of all the dimpled specimens in both low and high viscous oils. The high viscous oil found to be more efficient regarding coefficeint of friction compared to the low viscous oil. The degree of wear of the specimens was analyzed on the basis of wear scar developed on the counter surface as it supplements the wear during the friction tests. The resistance to wear of the sliding specimens was found to be increased in high viscous oil compared to that in low viscous oil.

Optimierung geklebter Stahl-Keramik-Verbunde/Optimization of bonded steel-ceramic-joints

2020 ◽  
Vol 110 (07-08) ◽  
pp. 511-516
Author(s):  
Michael Stroka ◽  
Sascha Stribick ◽  
Michael Raab
Keyword(s):  
Bonding Strength ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Adhesively Bonded ◽  
Laser Parameters

Der Beitrag beschreibt, wie sich die Festigkeiten geklebter Stahl-Keramik-Verbunde durch eine Laserstrukturierung der Oberflächen gezielt beeinflussen lassen. Dabei wurden unterschiedliche Strukturierungsmuster aufgebracht und Laserparameter wie Leistung und Frequenz variiert und deren Auswirkungen auf die Klebfestigkeit untersucht.   This article presents the change of strength of adhesively bonded steel-ceramic-joints by the use of laser surface texturing. To this end, different pattern and laser parameters such as power und frequency were performed on samples and the effects on the bonding strength were investigated.

Effect of laser surface texturing on tribological behaviour of grey cast iron

2019 ◽  
Vol 13 (2/3) ◽  
pp. 220
Author(s):  
B. Anil Kumar ◽  
P. Dinesh Babu ◽  
P. Marimuthu ◽  
Muthukannan Duraiselvam
Keyword(s):  
Cast Iron ◽  
Surface Texturing ◽  
Laser Surface ◽  
Grey Cast Iron ◽  
Laser Surface Texturing ◽  
Tribological Behaviour ◽  
Grey Cast

scholarly journals Does laser surface texturing really have a negative impact on the fatigue lifetime of mechanical components?

Friction ◽  
2021 ◽  
Author(s):  
Chia-Jui Hsu ◽  
Andreas Stratmann ◽  
Simon Medina ◽  
Georg Jacobs ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Boundary Lubrication ◽  
Surface Texturing ◽  
Contact Stresses ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Loss ◽  
Textured Surface ◽  
Periodic Patterns ◽  
Rolling Bearings ◽  
Fatigue Lifetime

AbstractLaser surface texturing (LST) has been proven to improve the tribological performance of machine elements. The micro-scale patterns manufactured by LST may act as lubricant reservoirs, thus supplying oil when encountering insufficient lubrication. However, not many studies have investigated the use of LST in the boundary lubrication regime, likely due to concerns of higher contact stresses that can occur with the increasing surface roughness. This study aims to examine the influence of LST on the fatigue lifetime of thrust rolling bearings under boundary lubrication. A series of periodic patterns were produced on the thrust rolling bearings, using two geometrically different designs, namely cross and dimple patterns. Base oil ISO VG 100 mixed with 0.05 wt% P of zinc dialkyldithiophosphate (ZDDP) was supplied. The bearings with cross patterns reduce the wear loss by two orders of magnitude. The patterns not only retain lubricant in the textured pockets but also enhance the formation of an anti-wear tribofilm. The tribofilm generation may be improved by the higher contact stresses that occur when using the textured surface. Therefore, in contrast to the negative concerns, the ball bearings with cross patterns were instead found to increase the fatigue life by a factor of three.

Tribological effects of laser surface texturing and residual stress

2018 ◽  
Vol 70 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Shuwen Wang ◽  
Feiyan Yan ◽  
Ao Chen
Keyword(s):  
Residual Stress ◽  
Wear Resistance ◽  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface ◽  
Friction Reduction ◽  
Laser Surface Texturing ◽  
Wear Testing ◽  
Content Type ◽  
Surface Textures

Purpose The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces. Design/methodology/approach Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication. Findings Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress. Originality/value The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.

Effect of Micro-Manufacturing Processes on Surface Behavior

2007 ◽  
Author(s):  
Tiffany Davis ◽  
Jian Cao ◽  
Wei Chen ◽  
Q. Jane Wang ◽  
Cedric Xia ◽  
...  
Keyword(s):  
Surface Texture ◽  
Surface Texturing ◽  
Steel Sample ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Copper Sheet ◽  
Property Variation ◽  
Nano Indentation ◽  
Interface Surface ◽  
Significant Difference

Surface texturing has become a valuable technique for reducing friction and wear in contacting parts; laser surface texturing is one such method used to create micro-dimples on the interface surface. This work investigates the surface material property variation caused by laser surface texturing. The hardness and modulus of elasticity of a steel laser surface texture sample were evaluated near the dimples and away from the dimpled zone through nano-indentation. Resulting data shows that no significant difference exists between the material properties from the two positions. An alternate technique for surface texture generation was also explored, involving the use of micro-punches to create surface features in a metal sample. Computational simulations were performed using a second material underneath a thin copper sheet. The second material was present to serve as a support and to allow extensive deformation of the top material. The choice of the support material and ratio of material thicknesses was optimized to minimize pile up. Trials were conducted for three base supporting materials: PTFE, PMMA, and aluminum. Results show that PMMA performed better than the other materials. Positive deflection was minimized when the PMMA thickness was at least fifteen times that of the copper sheet. Physical experiments were completed with a thin copper sheet to verify the results. An array of micro-indentations was also created in a bulk steel sample. In order to assess the effect of dimpling via micro-forming, nano-indentation was performed near and far from the deformed material of the dimples. Similar to the laser textured sample, no significant differences were found between the two locations.

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