scholarly journals Abrasion Testing Machine on Trial-Out for Fishing-Net Cords

1957 ◽  
Vol 6 (51) ◽  
pp. 782-787
Author(s):  
Isao OKAMURA ◽  
Sigeta FUJIMOTO
Keyword(s):  
Testing Machine ◽  
Abrasion Testing

Comparative Study on the Wear Behavior of FPM and NBR in the Natural Crude Oil Medium

2013 ◽  
Vol 456 ◽  
pp. 349-353
Author(s):  
Zhe Wang ◽  
Shi Jie Wang
Keyword(s):  
Friction Coefficient ◽  
Crude Oil ◽  
Wear Behavior ◽  
Testing Machine ◽  
Wear Test ◽  
Premature Failure ◽  
Oil Drilling ◽  
Rotating Speed ◽  
Before And After ◽  
Abrasion Testing

The wear behavior of stator rubber in the natural medium of crude oil in oil-drilling screw pumps directly matters to its service life and sealing property. The premature failure of stator rubber is the main cause for the shortening life of screw pumps. In order to study the wear mechanism of NBR and FPM, a friction wear test was conducted at room temperature by using a MPV-600 micro-computer-controlling grain-abrasion testing machine, in which NBR, FPM and 45# steal pair are the testing subjects. SEM was afterwards employed to observe the surface topography before and after the rubber wear. The test result shows that at the constant low load, the wear extent of FPM increases in a stable, linear way when the rotor rotating speed increases, and the wear extent of NBR increases with the increasing speed of the rotor rotating speed. However, when the rotating speed is over 400r/min, the wear extent of NBR decreases instead. This might be attributed to the improvement of the local lubrication state on the friction surface. Much consistence is indicated in the changing rule of the friction coefficient of the two types of rubber and the changing wear extent with the rotating speed. At the constant, low rotating speed, the wear extent of NBR and FPM basically increases linearly, while the friction coefficient of NBR, FPM and steel pair decreases with the increasing load.

Friction and Wear Properties of Al-Based Hypereutectic Silicon Coatings Fabricated by Supersonic Particles Deposition on ZM5 Magnesium Alloy

2014 ◽  
Vol 952 ◽  
pp. 125-129
Author(s):  
Xiao Jun Shi ◽  
Hai Bo Jiang ◽  
Ju Kun Yao ◽  
Zhi Qian Wang ◽  
Chao Ji Zhou ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Testing Machine ◽  
Three Dimensional ◽  
Micro Hardness ◽  
Wear Properties ◽  
Hardness Tester ◽  
Wear Protection ◽  
Resistant Layer ◽  
Mechanical Bonding ◽  
Abrasion Testing

To improve the anti-wear properties of Mg alloys, Al-13Si, Al-15Si and Al-19Si coatings were prepared by supersonic particles deposition on the surface of ZM5 magnesium alloy. Micro-structure and anti-wear properties of the coatings were examined by digital micro-hardness tester, XRD, friction and abrasion testing machine, three-dimensional microscope and SEM. The results show that the wear-resistant layer and the magnesium substrate can be well integrated as mechanical bonding and the main wear failure mechanism of the three coatings is adhesive wear. Moreover, the micro-hardness of Al-19Si coating is 141.47HV0.05, much higher than Al-13Si coating (134.97HV0.05) and Al-15Si coating (136.02HV0.05). Besides, the anti-wear properties of Al-19Si coating is optimal, superior to Al-15Si coating and Al-13Si coating. All of those indicate that Al-19Si coating can provide the most excellent anti-wear protection for ZM5 magnesium alloy.

Improved Single-Unit Schiefer Abrasion Testing Machine

1949 ◽  
Vol 19 (5) ◽  
pp. 259-269 ◽  
Author(s):  
Herbert F. Schiefer ◽  
Lawrence E. Crean ◽  
John F. Krasny
Keyword(s):  
Single Unit ◽  
Testing Machine ◽  
Abrasion Testing

Typical Materials’ Abrasion Rules and Failure Lives Prediction of Key Parts for Breech Mechanism Based on Virtual Prototype

2012 ◽  
Vol 531-532 ◽  
pp. 45-48
Author(s):  
Hui Bin Hu ◽  
Li Jun Cao ◽  
Xin Wen Cao ◽  
Shu Xiao Chen ◽  
Yan Sun
Keyword(s):  
Sliding Friction ◽  
Testing Machine ◽  
Prediction Method ◽  
Virtual Prototype ◽  
Dry Sliding ◽  
Load Spectrum ◽  
Major Fault ◽  
Pin On Disc ◽  
Fault Mode ◽  
Abrasion Testing

As a kind of complicated mechanical automation, most of key parts of breech mechanism are cams delivering forces and movements by parts’ outline and figure. The major fault mode of breech mechanism is grain abrasion caused by dry sliding friction. There are no feasible and practical technologies to simulate and predict the abrasion failure lives of key parts for breech mechanism. A new simulation and prediction method is firstly put forward in this paper. Based on Pro/E and ADAMS, the virtual prototype of breech mechanism of semiautomatic vertical sliding-wedge type is established. Key parts’ load spectrum can be obtained based on virtual prototype. Pin-on-disc friction and abrasion testing machine is designed and adopted to obtain typical materials’ abrasion rules. Finial simulation and prediction results are given as abrasion thresholds and operating items, which provide sufficient references for breech mechanism’s design and safeguard.

Determination of Resistance to Abrasive Wear. V. Influence of Calender Grain

1948 ◽  
Vol 21 (1) ◽  
pp. 254-256
Author(s):  
R. W. Parris ◽  
J. R. Scott
Keyword(s):  
Abrasive Wear ◽  
Test Piece ◽  
Flat Surface ◽  
Testing Machine ◽  
Standard Form ◽  
Magnesium Carbonate ◽  
Actual Use ◽  
Cutting Out ◽  
Abrasion Testing

Abstract The standard form of test-piece used on the type of abrasion testing machine of the Akron Standard Mold Company is a disc of about 63.5 mm. diameter and 12.5 mm. thick. This can be made either (1) by vulcanizing in a mold of appropriate shape, which is filled with a blank cut from a sheet of stock about 13 mm. thick, or (2) by cutting out from a mold-vulcanized slab 12.5 mm. thick. In either case the abrasive wear takes place on a surface corresponding to the edge of a disc cut from the sheet of stock. The same is true if tests are made on discs cut from rubber articles such as soles, flooring, or other material in sheet form. In the actual use of such articles as tires, soles and heels flooring, conveyor belting, and tough rubber cable sheaths, the abrasive wear occurs on a surface representing substantially the flat surface of the sheet of stock. If the stock contains fillers that produce a calender grain effect, e.g., magnesium carbonate and clay, it cannot be assumed that the wear on the flat surface of the sheet is the same as that on the edge of a disc cut from it, which lies in a plane perpendicular to the former surface. If there is a difference between the rates of wear on these two surfaces, the type of test-piece described above must give an incorrect indication of the abrasion resistance of the rubber in actual use.

scholarly journals Wear of sprag clutch wedge in overrun state under high temperature condition

2021 ◽  
Vol 13 (2) ◽  
pp. 168781402199651
Author(s):  
Jia Li ◽  
Hongzhi Yan ◽  
Minghao Lin ◽  
Mengkai Cai ◽  
Xuan Hu
Keyword(s):  
High Temperature ◽  
Testing Machine ◽  
Three Dimensional ◽  
Surface Profile ◽  
Orthogonal Experimental Design ◽  
Wear Depth ◽  
Wear Model ◽  
Theoretical Support ◽  
Worn Surface ◽  
Abrasion Testing

A formula is proposed based on Archard’s wear model to calculate wedge wear depth in a positive continuous engagement (PCE)-type sprag clutch with double-disc inner cam wedge in the overrun state. Methods to solve for the equation parameters are proposed. Using a sprag clutch with an M50 steel wedge as an example, wedge wear depth variation over time under high temperatures was analyzed. An easy-to-clamp wedge was designed and a high-temperature abrasion testing machine was used to test the wedge. The worn surface profile was observed using a three-dimensional profiler and the wedge wear depth was obtained. The effects of lubrication, temperature and speed on wear were analyzed using mixed-level orthogonal experimental design. Results show that the theoretical values are consistent with test values. Therefore, the model can be used to calculate wear accurately for the overrunning sprag clutch. Lubrication affects wear depth significantly, whereas temperature has a smaller effect and speed has very little influence. Within the experimental scope, when the temperature increased by 1°C, the wear depth increased by approximately 0.0145 μm and when the speed increased by approximately 1 time/minute, the wear depth increased by 0.00854 μm. These results provide theoretical support for optimal sprag clutch design.

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