On the Friction Test for Metal Forming Applications

2020 ◽  
pp. 158-161
Author(s):  
Sergei Alexandrov ◽  
Marko Vilotic ◽  
Dragisa Vilotic
Keyword(s):  
Metal Forming ◽  
Friction Test

scholarly journals Temperature induced friction increase in friction test and forming demonstrator for sheet metal forming

2021 ◽  
Author(s):  
Jan Filzek ◽  
Daniel Keil ◽  
Holger Schröder
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Transient Effects ◽  
Friction Test ◽  
Drawing Test ◽  
Machine Operators ◽  
Strip Drawing ◽  
Flat Strip ◽  
The Individual

High process stability is needed in sheet metal forming industry. This can be achieved by predicting and controlling the transient process and temperature variation, especially at start of production. In this connection, the temperature induced friction changing plays a significant role because it leads to product failures. The handling of the transient friction effects is currently done reactively, based on the individual experience of the machine operators. In future, those transient effects need to be controlled. This paper shows initially an analysis of the temperature induced friction increase in a well-known and proven flat strip drawing test. Different tribological systems were tested at tool temperatures between 20 and 80 °C. The temperature increase results in a higher friction of up to 77 %. Several influences on friction increase will be presented. These friction influences were verified afterwards with a heated forming demonstrator under laboratory conditions.

Determination of Friction Condition by Geometrical Measurement of Backward Extruded Aluminum Alloy Specimen

2002 ◽  
Vol 124 (2) ◽  
pp. 409-415 ◽  
Author(s):  
Yong-Taek Im ◽  
Jae-Seung Cheon ◽  
Seong-Hoon Kang
Keyword(s):  
Process Design ◽  
Metal Forming ◽  
Friction Condition ◽  
Friction Test ◽  
Alloy Specimen ◽  
New Type ◽  
Tip Position ◽  
Tip Test ◽  
Set Up

The proper determination of friction condition during metal forming operations is imperative for successful process design and production of parts. Through the years, various methods of determining the friction condition have been proposed, but all methods have some drawbacks. In this study, a new type of friction test named tip test based on backward extrusion of AL6061-O is proposed. The experimental set-up of this method induces the formation of a sharp radial tip on the extruded end of the workpiece. It has been found that the simple geometrical measurement of this radial tip position can be used to effectively determine the friction condition.

scholarly journals Experimental Evaluation of Cold Forging Lubricants Using Double-Cup-Extrusion-Tests

2018 ◽  
Vol 918 ◽  
pp. 65-70 ◽  
Author(s):  
Robby Lorenz ◽  
Hinnerk Hagenah ◽  
Marion Merklein
Keyword(s):  
Metal Forming ◽  
Material Flow ◽  
Zinc Phosphate ◽  
Influencing Factor ◽  
Environmentally Benign ◽  
Cold Forging ◽  
Friction Test ◽  
Molybdenum Disulphide ◽  
Tribological System ◽  
Comprehensive Knowledge

Cold forging processes enable the economical production of high quality components like joints, shafts and gears. The manufactured parts are characterized by improved properties such as hardness, surface quality and fatigue strength. For manufacturing components using cold forging, a comprehensive knowledge regarding the cold forging procedure and its process parameters is needed. One important influencing factor, which needs to be analyzed to use the potential of this kind of processes, is the tribological system, especially the used lubricant. The tribological conditions significantly influence the material flow and thus the workpiece quality. Furthermore, resource efficient and environmentally benign metal forming processes became very important within the last decade. The present study evaluates the resulting tribological conditions and their differences for various cold forging lubricants with and without a zinc phosphate based lubricant carrier. The lubricants are based on molybdenum disulphide, polymers, or both inorganic salts and waxes. The tribological conditions of the different lubricants are investigated using the Double-Cup-Extrusion-Test (DCET) as a laboratory friction test.

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.

Compatibility Between Tool Materials and Workpiece in Sheet-Metal Ironing Process

1990 ◽  
Vol 112 (2) ◽  
pp. 275-281 ◽  
Author(s):  
K. Dohda ◽  
N. Kawai
Keyword(s):  
Mild Steel ◽  
Metal Forming ◽  
Surface Generation ◽  
Frictional Surface ◽  
Tool Steels ◽  
Friction Test ◽  
Surface Appearance ◽  
Tool Materials ◽  
Die Materials ◽  
Carbide Ceramics

To assess the tool-workpiece compatibility in metal forming, a friction test is carried out on a strip-ironing type tribometer, which can estimate quantitatively the effect of new surface generation during the process and sliding travel on galling. The workpiece is mild steel and the die materials are tool steels of various kinds, cemented carbide, ceramics, and surface treated steels. The compatibility is estimated through examination of the frictional characteristics, observation of the frictional surface, and the surface appearance of products. The effect of lubricants on compatibility is also examined.

933 Friction Test with Side Tensile Stress in Metal Forming

2012 ◽  
Vol 2012.20 (0) ◽  
pp. _933-1_-_933-3_
Author(s):  
Zhigang WANG ◽  
Yasuharu YOSHIKAWA ◽  
Tatsuhiro SUZUKI
Keyword(s):  
Tensile Stress ◽  
Metal Forming ◽  
Friction Test

Metal Forming Analysis

2001 ◽  
Author(s):  
R. H. Wagoner ◽  
J.-L. Chenot
Keyword(s):  
Metal Forming ◽  
Forming Analysis

ИССЛЕДОВАНИЕ ТОЧНОСТИ ДЕТАЛЕЙ, ПОЛУЧАЕМЫХ ПРИ РАЗДЕЛИТЕЛЬНЫХ ОПЕРАЦИЯХ В ПЕРЕНАЛАЖИВАЕМЫХ ШТАМПАХ

2018 ◽  
pp. 52-63
Author(s):  
Е. А. Фролов ◽  
В. В. Агарков ◽  
С. И. Кравченко ◽  
С. Г. Ясько
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Balance Method ◽  
Experiment Planning ◽  
Practical Recommendations

To determine the accuracy of the readjustable punches for separating operations (perforation + punching out) of sheet-metal forming, the accuracy parameters were analyzed using the random balance method using the method of experiment planning. Analytical dependencies are obtained to determine the values of deviation of the outer and inner contour dimensions of perforated and punched out sheet parts. From the dependencies obtained, it is possible to estimate and predict the value of deviation in the dimensions of the resulting part at any time during the operation of the punch. Practical recommendations on the calculation of the actuating dimensions of the working elements (stamping punch, matrix) of readjustable punches are offered.

Sign in / Sign up

Export Citation Format

Share Document