The Friction Coefficient Testing Method of Metallic Sheet and Strip

2012 ◽  
Vol 629 ◽  
pp. 75-78 ◽  
Author(s):  
Huan Xue ◽  
Nan Xiang Kuang ◽  
Hong Chuan Zhu
Keyword(s):  
Coefficient Of Friction ◽  
Metal Forming ◽  
Processing Method ◽  
Materials Testing ◽  
Friction Test ◽  
Testing Method ◽  
Data Processing Method ◽  
The Coefficient Of Friction ◽  
Sample Testing ◽  
Metallic Sheet

The research background and the generation of friction are introduced. The importance of the coefficient of friction test in sheet metal forming field is indicated. Standards of coefficient of friction of metallic sheet and other related materials testing method are described. The experimental principle, the size and preparation of testing sample, testing equipment and procedure, result data processing method are presented.

The Important Influencing Factors of Coefficient of Friction Testing on Metallic Sheet and Strip

2012 ◽  
Vol 503-504 ◽  
pp. 529-532
Author(s):  
Huan Xue ◽  
Rong Feng Li ◽  
Hong Chuan Zhu ◽  
Wen Jie Peng
Keyword(s):  
Coefficient Of Friction ◽  
Test Results ◽  
Friction Test ◽  
Testing Method ◽  
Friction Testing ◽  
Specimen Width ◽  
The Coefficient Of Friction ◽  
Strip Testing ◽  
Metallic Sheet ◽  
Lubrication Conditions

The importance of the coefficient of friction test in sheet metal forming field is introduced. Metallic sheet and strip testing method for coefficient of friction is described, the experimental principle of the testing method is introduced. Three important factors, which will obviously effects the test results, including testing mould, specimen width and surface lubrication conditions have been carefully studied. The comparatively stable testing technologies have been developed to guide the test.

The Data Processing Technique of Metallic Sheet Friction Coefficient Determination

2012 ◽  
Vol 184-185 ◽  
pp. 688-691
Author(s):  
Huan Xue ◽  
Rong Feng Li ◽  
Hong Chuan Zhu
Keyword(s):  
Data Processing ◽  
Coefficient Of Friction ◽  
Normal Pressure ◽  
Processing Technique ◽  
Test Results ◽  
Friction Zone ◽  
Data Processing Method ◽  
The Coefficient Of Friction ◽  
Processing Techniques ◽  
Metallic Sheet

The definition and research background of friction is introduced. The reason of generation of friction is analyzed, the importance of the coefficient of friction test in sheet metal forming field is indicated. The testing principle of coefficient of friction on metallic sheet is presented. The basic data processing method of the test is described. Two important data processing techniques which will obviously effects the test results, including effective friction zone and normal pressure have been carefully studied. The comparison result shows these techniques can effectively enhance the testing stability and precision.

scholarly journals Experimental analysis of the surface roughness in the coefficient of friction test

2019 ◽  
Vol 41 ◽  
pp. 153-160
Author(s):  
Roque Calvo ◽  
Roberto D’Amato ◽  
Emilio Gómez ◽  
Alessandro Ruggiero
Keyword(s):  
Surface Roughness ◽  
Coefficient Of Friction ◽  
Experimental Analysis ◽  
Friction Test ◽  
The Coefficient Of Friction

scholarly journals Contact pressure and sliding velocity ranges in sheet metal forming simulations

2021 ◽  
Author(s):  
Joseba Cillaurren ◽  
Lander Galdos ◽  
Mario Sanchez ◽  
Alaitz Zabala ◽  
Eneko Saenz de Argandoña ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Contact Pressure ◽  
Sheet Metal ◽  
Coefficient Of Friction ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Sliding Velocity ◽  
Wide Range ◽  
The Coefficient Of Friction ◽  
Friction Models

In the last few years many efforts have been carried out in order to better understand what the real contact between material and tools is. Based on the better understanding new friction models have been developed which have allowed process designers to improve numerical results in terms of component viability and geometrical accuracy. The new models define the coefficient of friction depending on different process parameters such as the contact pressure, the sliding velocity, the material strain, and the tool temperature. Many examples of the improvements achieved, both at laboratory scale and at industrial scale, can be found in the recent literature. However, in each of the examples found in the literature, different ranges of the variables affecting the coefficient of friction are covered depending on the component analysed and the material used to produce such component. The present work statistically analyses the contact pressure and sliding velocity ranges achieved during numerical simulation (FEM) of sheet metal forming processes. Nineteen different industrial components representing a high variety of shapes have been studied to cover a wide range of casuistic. The contact pressure and sliding velocity corresponding to typical areas of the tooling have been analysed though numerical simulation in each case. This study identifies the ranges of contact-pressure and sliding velocities occurring in sheet metal forming aimed to set the characterization range for future friction studies.

scholarly journals Tribological Performance of Environmentally Friendly Bio-Degradable Lubricants Based on a Combination of Boric Acid and Bio-Based Oils

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3892
Author(s):  
Tomasz Trzepieciński
Keyword(s):  
Boric Acid ◽  
Sheet Metal ◽  
Coefficient Of Friction ◽  
Vegetable Oils ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Low Carbon Steel ◽  
Environmentally Friendly ◽  
Low Carbon ◽  
The Coefficient Of Friction

Finding effective and environmentally friendly lubrication to use in sheet metal forming operations presents a substantial environmental and economic challenge to the automotive industry. This paper examines the effectiveness of different lubricants in the reduction of the coefficient of friction (COF) in the process of sheet metal forming of the low carbon steel sheets. These lubricants are based on a combination of boric acid (H3BO3) and edible vegetable oils, both of which are natural and environmentally friendly. To evaluate the friction characteristics of the lubricants in a forming operation, a strip drawing friction test is used. This test consisted in drawing a specimen in the form of a sheet metal strip between two non-rotating counter-samples with radii of 200 and 10 mm. The effectiveness of environmentally friendly lubricants in reducing the COF was compared to the traditional petroleum-based lubricants which are used in sheet metal-forming operations. The effect of lubricant conditions and tool surface roughness on the value of COFs is studied. It was found that palm oil in both configurations of countersample radius, both as pure oil and with the addition of 5 wt.% of H3BO3, was the most effective in lowering the coefficient of friction. In most of the conditions analysed, the addition of boric acid into vegetable oils leads to an increase in the lubrication efficiency by up to 15% compared to pure oils. The effectiveness of lubrication by olive and rapeseed oils in decreasing the frictional resistances clearly depends on the nominal pressure applied.

Correlating the Features of Topography to Friction by Sliding Experiments

2008 ◽  
Author(s):  
Anirudhan Pottirayil ◽  
Pradeep L. Menezes ◽  
Satish V. Kailas
Keyword(s):  
Sheet Metal ◽  
Coefficient Of Friction ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Work Piece ◽  
Manufacturing Processes ◽  
Experimental Procedure ◽  
The Coefficient Of Friction ◽  
Soft Metal

Friction can influence the quality of the finished product to a large extent in certain manufacturing processes. Sheet metal forming is a particular case, where the friction between the hard-die and the relatively soft work-piece can be extremely important. Under such conditions, topography of the harder surface can influence the resistance to traction at the interface. This paper discusses about the correlation between certain features of the surface topography and coefficient of friction based on experiments involving sliding of a few soft metal pins against a harder material. A brief description of the experimental procedure and the analysis are presented. A hybrid parameter which encapsulates both the amplitude features as well as the relative packing of peaks is shown to correlate well with the coefficient of friction.

scholarly journals A Friction-Test Benchmark with Twintex PP

2012 ◽  
Vol 504-506 ◽  
pp. 307-312 ◽  
Author(s):  
Ulrich Sachs ◽  
Konstantine A. Fetfatsidis ◽  
Josefine Schumacher ◽  
Gerhard Ziegmann ◽  
Samir Allaoui ◽  
...  
Keyword(s):  
Coefficient Of Friction ◽  
Temperature Regulation ◽  
Force Control ◽  
Research Groups ◽  
Friction Test ◽  
Testing Methods ◽  
Test Set ◽  
Astm Standard ◽  
The Coefficient Of Friction ◽  
Set Up

This paper presents an update on a friction benchmark, that was proposed during the 13th ESAFORM conference. The goal is to compare different friction test set-ups [1–4] by determining the coefficient of friction (CoF) for Twintex® PP. The benchmark instructions are based on the ASTM standard D1894 [5] but also account for different friction velocities, pressures and temperatures. At the time of writing five research groups contributed to the benchmark, each with a custom designed test set-up, differing in size, mechanism, force control and temperature regulation. All tests will be conducted with woven glass reinforced polypropylene, from the same Twintex® batch. Conclusions will be drawn about the comparability of different testing methods by recognizing and analyzing systematically deviating results.

Dry Forming of Aluminium Sheet Metal: Influence of Different Types of Forming Tool Microstructures on the Coefficient of Friction

2015 ◽  
Vol 651-653 ◽  
pp. 516-521 ◽  
Author(s):  
Peter Scholz ◽  
Richard Börner ◽  
Ralf Kühn ◽  
Roland Müller ◽  
Andreas Schubert
Keyword(s):  
Sheet Metal ◽  
Coefficient Of Friction ◽  
Metal Forming ◽  
Process Chains ◽  
Different Types ◽  
Strip Drawing ◽  
The Coefficient Of Friction ◽  
Surface Microstructures ◽  
Forming Tools ◽  
Frictional Behaviour

In the sheet metal forming industry lubricants are applied in forming processes to expand the technological boundaries by reducing friction and wear. The friction between tool and sheet metal is crucial to the deep drawing process. Due to economic and ecological reasons the aim of the manufacturers is to reduce or even avoid the use of lubricants. Consequently, this approach enables both a shortening of the process chains and an essential saving of resources. The advantages of structured forming tools in lubricated processes concerning the reduction of the coefficient of friction by the appearance of lubricating micro pockets are well-known. However, without using any lubricant this effect does not work. In this case the contact area is reduced by structuring the forming tool which affects the tribological system.In this paper the influence of microstructures with different geometries and surface treatments (uncoated / a-C:H:Si-coating) on the coefficient of friction in dry metal forming of the alloy AA5182 is compared to the frictional behaviour of unstructured forming tools using lubricant as reference. Before coating, the forming tools are machined by milling to generate tribologically effective microstructures. With the use of a strip drawing plant the effects of different surface microstructures and materials on the coefficient of friction are investigated.

Influence of Surface Textures During Metal Forming

2007 ◽  
Author(s):  
Pradeep L. Menezes ◽  
Kishore ◽  
Satish V. Kailas
Keyword(s):  
Flow Pattern ◽  
Coefficient Of Friction ◽  
Surface Texture ◽  
Metal Forming ◽  
Metal Flow ◽  
Steel Plates ◽  
Work Piece ◽  
Layer Formation ◽  
Transfer Layer ◽  
The Coefficient Of Friction

Friction plays an important role in metal forming processes. In the present investigation, various kinds of surface texture with varying roughness were produced on steel plates. Pins made of Al-8Mg alloy were then slid against the prepared steel plates using inclined pin-on-plate sliding tester to understand the role of surface texture of the harder surface and load on coefficient of friction and transfer layer formation under both dry and lubricated conditions. It was observed that both the coefficient of friction and transfer layer formation are highly dependent on the surface texture of harder counterface. Numerical analysis of simulated compression test, assigning different magnitude of coefficient of friction at different regions between the die and work piece, was carried out to understand the effect of friction on deformation and stress distribution. Results of simulation revealed that, owing to the difference in coefficient of friction, there is a difference in metal flow pattern. Both experimental and numerical results confirmed that the surface texture of the die surface and thus coefficient of friction directly affects the strain rate and flow pattern of the work-piece.

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