Evaluation of friction condition in cold forging by using T-shape compression test

2009 ◽  
Vol 209 (17) ◽  
pp. 5720-5729 ◽  
Author(s):  
Q. Zhang ◽  
E. Felder ◽  
S. Bruschi
Keyword(s):  
Compression Test ◽  
Friction Condition ◽  
Cold Forging

Influence of the Preforming Material State in Common Tribological Tests

2016 ◽  
Vol 1140 ◽  
pp. 75-82
Author(s):  
Bastian Zimmermann ◽  
Marion Merklein
Keyword(s):  
Compression Test ◽  
Work Hardening ◽  
Test Sample ◽  
Wire Drawing ◽  
Cold Forging ◽  
The Real ◽  
Friction Factors ◽  
Ring Compression ◽  
Material State ◽  
Rolled Wire

Different tests to determine friction factors for cold forging processes are given in the literature. The double cup extrusion test, the ring compression test and the T-shape compression test are three of the common tests, which are compared in this investigation. From former investigations it is known that there is an influence of the work-hardening of the test sample on the friction factor, which is determined by the test. At this study, the influence of the work-hardening of the material on the three named tests is investigated by using a wire drawing process. In addition, the drawn wire from the originally thermo mechanical rolled wire is also annealed to have a second material state without any work-hardening. The used material and its numerical modelling as well as the analyzed tribological conditions of the real specimens are described. Afterwards the three test setups are explained for the numerical as well as for the real experiments. In the end, the influence of the drawing respectively the work-hardening for the three tests is presented and discussed.

scholarly journals Evaluation of Cold Forging Lubricants for Steel by Ring Compression Test with Rotating Die

2018 ◽  
Vol 59 (687) ◽  
pp. 53-58
Author(s):  
Masatoshi SAWAMURA ◽  
Yasuhiro YOGO ◽  
Michiaki KAMIYAMA ◽  
Noritoshi IWATA
Keyword(s):  
Compression Test ◽  
Cold Forging ◽  
Ring Compression Test ◽  
Ring Compression

A New Concept of the Sliding Compression Test to Independently Investigate the Contact Normal Stress and the Surface Enlargement

2014 ◽  
Vol 939 ◽  
pp. 473-480
Author(s):  
Peter Groche ◽  
Christoph Müller ◽  
Mira Keller
Keyword(s):  
Friction Coefficient ◽  
Normal Stress ◽  
Compression Test ◽  
The Other ◽  
Cold Forging ◽  
Efficient Process ◽  
Highly Efficient ◽  
Other Hand ◽  
Sliding Compression Test

Cold forging is a highly efficient process to produce components. However, the occurring tribological loads are tremendous. Therefore, complex tribological systems are necessary. They can be influenced by numerous factors. Most important are the tribological loads, which can usually be investigated independently. On the other hand, the contact normal stress and the surface enlargement are coupled in tribometer tests. In order to investigate them independently, a new concept for the Sliding Compression Test is presented and verified. This procedure reveals that both values have an influence on the friction coefficient. However, the influence of the surface enlargement is with about two-thirds higher.

Utilization of Ring Compression Test to Investigate the Mushroom Effect and Adhesive Nature of AA2014 Billets

2018 ◽  
Vol 1148 ◽  
pp. 96-102
Author(s):  
Ch. Harikrishna ◽  
M.J. Davidson ◽  
P. Srinivasa Raju ◽  
G. Srinivasa Rao
Keyword(s):  
Finite Element ◽  
Compression Test ◽  
Cold Forging ◽  
Outer Diameter ◽  
Ring Compression Test ◽  
Molybdenum Disulphide ◽  
H13 Steel ◽  
White Grease ◽  
Ring Compression ◽  
Different Levels

In the cold forging of AA2014, friction at the die/billet interface plays a significant role. AA2014 metallic rings of height 8 mm with an outer diameter of 24 mm and inner diameter of 12 mm was upset between H13 steel dies to different levels of deformation. Different types of lubricants namely, grease, molybdenum disulphide, white grease, palm oil were employed at the die/ring interface and ring compression test was also conducted for un lubricated condition. The values based on the changes in the geometry after different levels of deformation were fit into Male and Cockroft calibration curves to estimate the friction factor (m). The values of friction factors determined from the experiments were given as input to the finite element package, Deform 2D. The results obtained from the finite element studies were compared with the experimental results. After validation, the research was extended by considering ring geometries of different sizes. The effect of the friction between the die/billet interface and geometry were studied on the flow of metal. The zone of minimum velocity of particles, defined as neutral plane was analyzed for different friction conditions and different geometries of the ring.

Cold Forging with Lubricated Tools

2014 ◽  
Vol 611-612 ◽  
pp. 971-980 ◽  
Author(s):  
Christoph Müller ◽  
Lena Rudel ◽  
Deniz Yalcin ◽  
Peter Groche
Keyword(s):  
Friction Coefficient ◽  
Compression Test ◽  
High Impact ◽  
Cold Forging ◽  
Ecological Awareness ◽  
System A ◽  
Tribological System ◽  
Single Bath ◽  
Definition Of ◽  
Sliding Compression Test

Cold forging processes require high-capability tribological systems in order to ensure sound forming results. Due to a rising ecological awareness, alternatives to the established and reliable conversion coatings are necessary. Single bath systems like polymers and salt wax coatings with integrated lubrication appear to be the most promising approach to prevent galling. For an optimization and investigation of the tribological system a definition of the tribological loads is necessary. However, only insufficient values are available in literature. Especially, long sliding distances, which occur in multistage operations, can cause a breakdown of the lubricant. Therefore, approaches are necessary to enable long sliding distances. This paper presents the results obtained with a cold forging tribometer, the Sliding Compression Test, which reveal the high impact of remaining lubricant on the friction coefficient. Also, tests with prelubricated tools show the ability to reduce the friction and the results of investigations with rough tool surfaces are presented.

A modern technique for high productivity cold forging

1962 ◽  
Vol 41 (9) ◽  
pp. 552 ◽  
Author(s):  
R. Hayward ◽  
P.J. Mullins
Keyword(s):  
Cold Forging ◽  
High Productivity ◽  
Modern Technique

Multiple recycling of paperboard: Paperboard characteristics and maximum number of recycling cycles— Part I: Multiple recycling of corrugated base paper

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 631-638
Author(s):  
FREDERIC KREPLIN ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Compression Test ◽  
Production Capacity ◽  
Strength Properties ◽  
Paper Properties ◽  
Corrugated Board ◽  
Laboratory Conditions ◽  
Base Paper ◽  
Study Results ◽  
Short Span ◽  
Multiple Recycling

Paper for recycling is an important fiber source for the production of corrugated base paper. The change in production capacity toward more and more packaging papers affects the composition of paper for recycling and influences the paper quality. This research project investigated the influence of the multiple recycling of five different corrugated base papers (kraftliner, neutral sulfite semichemical [NSSC] fluting, corrugating medium, testliner 2, and testliner 3) on suspension and strength properties under laboratory conditions. The corrugated board base papers were repulped in a low consistency pulper and processed into Rapid-Köthen laboratory sheets. The sheets were then recycled up to 15 times in the same process. In each cycle, the suspension and the paper properties were recorded. In particular, the focus was on corrugated board-specific parameters, such as short-span compression test, ring crush test, corrugating medium test, and burst. The study results indicate how multiple recycling under laboratory conditions affects fiber and paper properties.

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