Wear Behavior of Spindles of Cotton Picker in Field Work

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Youqiang Zhang ◽  
Yu Tian ◽  
Yonggang Meng
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Substrate Surface ◽  
Failure Process ◽  
Oxide Particle ◽  
Field Work ◽  
Rotation Direction ◽  
Cotton Picker ◽  
Cotton Picking

Abstract Spindles in cotton picking machinery are the key component, wear of the spindles significantly reduces harvest efficiency of the cotton picking process. To improve its wear resistance, the substrate surfaces of spindles are usually electroplated with chromium coating. But the failure process and wear mechanism of the spindle have not been studied so far. In this paper, based on the surface analyses and wear behavior of spindles of a cotton picker in field work, the test results showed that the worn surface was smoother and wear trend of surface topographies tend to consistent along with the rotation direction of the spindle and found a significant reduction in roughness and coating thickness. The coating of the spindle surface has not been damaged in the picking process, the wear mechanism was mainly abrasive wear. After the worn out of surface coating, abrasive wear is always present accompanied by oxidation wear. Multi-oxides were deposited on the substrate surface; the oxide particle was sheared by cotton fiber in the subsequent picking, leading to an increase in surface roughness and aggravating substrate wear. These in filed wear mechanisms and processes of spindles could be of help for the design and surface modification with longer working life.

A Fundamental Study of the Tribological Characteristics of Sheave Steel against a Wire Rope

2005 ◽  
Vol 297-300 ◽  
pp. 1382-1387 ◽  
Author(s):  
Jung Buk Ryu ◽  
Young Hun Chae ◽  
Seock Sam Kim
Keyword(s):  
Residual Stress ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Contact Surface ◽  
Wear Behavior ◽  
Substrate Surface ◽  
Cast Steel ◽  
Wire Rope ◽  
Low Carbon ◽  
Grease Lubrication

In contact conditions of crane sheave steel materials against a wire rope, the contact surface of the sheave generally exhibits scuff damage. In the present study, sliding wear tests using annealed-low carbon cast steel were carried out under three kinds of normal loads calculated from the actual model conditions in a pin-on-disk grease lubrication test. The sliding speed was fixed at 220mm/s. Therefore, the wear behavior and wear mechanism and the residual stress distribution of the substrate surface were examined. The results of this study indicate that the wear rate of annealedlow carbon cast steel depends on the diameter of the wires. The wear mechanism of annealed-low carbon cast steel is characterized by fatigue and abrasive wear, but the wire shows partial adhesion due to micro abrasive wear by fatigue crack propagation. The contact distribution of residual stress is independent of sliding distance. Therefore, there are constant values on the contact surface.

scholarly journals Effect of VN and TiB2-TiCx Reinforcement on Wear Behavior of Al 7075-Based Composites

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3389
Author(s):  
Yaping Bai ◽  
Jiale Wei ◽  
Naqing Lei ◽  
Jianping Li ◽  
Yongchun Guo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Room Temperature ◽  
Wear Behavior ◽  
Wear Test ◽  
Wear Properties ◽  
Al 7075 ◽  
Hot Pressing Sintering ◽  
Oxidation Wear

Al 7075 alloy, 15 wt.% VN/7075 composites, and 20 wt.% TiB2-TiCx/7075 composites were prepared by ball milling with subsequent hot-pressing sintering. The microstructure, hardness, and wear properties at room temperature to 200 °C of Al 7075-based composites with different reinforcement phases were discussed. The grain uniformity degree values of 15 wt.% VN/7075 composites and 20 wt.% TiB2-TiCx/7075 composites were 0.25 and 0.13, respectively. The reinforcement phase was uniformly distributed in 15 wt.% VN/7075 composites and 20 wt.% TiB2-TiCx/7075 composites, almost no agglomeration occurred. The order of hardness was 20 wt.% TiB2-TiCx/7075 composites (270.2 HV) > 15 wt.% VN/7075 composites (119.5 HV) > Al 7075 (81.8 HV). At the same temperature, the friction coefficient of 15 wt.% VN/7075 composites was the lowest, while the volume wear rate of 20 wt.% TiB2-TiCx/7075 composites was the lowest. With the increase of temperature, the wear mechanism of Al 7075 changed from spalling wear to oxidation wear and adhesion wear. However, the wear mechanisms of 15 wt.% VN/7075 and 20 wt.% TiB2-TiCx/7075 composites changed from abrasive wear at room temperature to wear mechanism (oxidation wear, abrasive wear, and adhesive wear) at medium and low temperature. Comprehensive wear test results indicated that 20 wt.% TiB2-TiCx/7075 composites had excellent tribological properties at medium and low temperature.

scholarly journals Abrasive wear behavior of PTFE for seal applications under abrasive-atmosphere sliding condition

Friction ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 755-767 ◽  
Author(s):  
Mingxue Shen ◽  
Bo Li ◽  
Zhinan Zhang ◽  
Longzhi Zhao ◽  
Guangyao Xiong
Keyword(s):  
Particle Size ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Removal Rate ◽  
Surface Characteristics ◽  
Particle Size Effect ◽  
Wear Process ◽  
Abrasive Wear Behavior ◽  
Three Body

Abstract Abrasive wear is a common failure phenomenon that often limits the service life of sealing elements. Evaluation and comparison of the abrasion resistance of polytetrafluoroethylene (PTFE) were conducted using Al2O3 particles with sizes in the range 5 to 200 µm on a pin-on-flat tribo-tester under dry reciprocating sliding conditions at room temperature. Based on the examined worn surface characteristics of both PTFE and 316L stainless steel (as a counterpart) and the analyzed coefficient of friction (COF) evolutions, the wear mechanism and particle size effect have been explored in detail. The results demonstrate that the abrasive size is the main contributing factor, which can drastically impact the wear mechanism and tribological properties of tribo-pairs. The COF exhibits different evolution characteristics (trends) for different abrasive sizes. For moderate particle sizes, the COF trends become more complicated and the most evident wear of the metallic counterpart is evident. The activity behaviors of abrasives are dominated by the particle size. Particles can becomes embedded in one of the tribo-pair materials to plough-cut the counterpart, thus causing two-body abrasive wear. The abrasives can also behave as free rolling bodies, which play the role of third body to realize three-body “PTFE-abrasive-316L” abrasion. When abrasives are involved in the wear process, both the wear rate and COF of the metallic counterpart increase, but the material removal rate of the PTFE is reduced. The results obtained can offer guidelines regarding the design and protection of seals.

Study on Fretting Wear Behavior of Medium Carbon Steel Used in Steel Worm Gear Pair

2010 ◽  
Vol 34-35 ◽  
pp. 1431-1435
Author(s):  
Zhu Jun Li ◽  
Da Tong Zhang ◽  
Ming Shao
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Medium Carbon Steel ◽  
Worm Gear ◽  
Fretting Wear ◽  
Wear Volume ◽  
Test Frequency ◽  
Test Parameters ◽  
Adhesion Wear

Fretting wear behavior of 40CrNiMoA steel was studied on a SRVⅣoscillating friction and wear tester. The results indicate that the fretting wear volume increase with test frequency, load and amplitude increasing. Meanwhile, the fretting wear mechanism is directly related to test frequency, load and amplitude. When they are small, the main fretting wear mechanism is abrasive wear, with these test parameters increasing, the main fretting wear mechanism turns to a combination of abrasive wear and adhesion wear. Based on the experimental results, the anti-fretting wear measures of steel worm gear pairs used in mechanical tracked regulator of tracked vehicle are discussed.

Properties of Electrospark Deposited YG8 Coatings on AISI H13 Steel

2012 ◽  
Vol 472-475 ◽  
pp. 1392-1396 ◽  
Author(s):  
Jian Zhang ◽  
Cean Guo ◽  
Guang Ming Shang
Keyword(s):  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
H13 Steel ◽  
Electrospark Deposition ◽  
Aisi H13 Steel ◽  
Delamination Wear ◽  
Aisi H13 ◽  
Steel Substrates ◽  
Micro Indentation

YG8 coatings were deposited on AISI H13 steel substrates by means of electrospark deposition (ESD). The coatings were characterized in terms of their microstructure, hardness, friction and wear behavior. Micro-indentation and tribometer testers were employed to measure the mechanical properties of YG8 coatings and AISI H13 steel. The results showed that the hardness of the coatings ranged from 1820 to 1880 HV, with a higher value than that of AISI H13 steel (510HV). The average coefficient of steady-state friction of the coatings under the loads of 10N, 20N and 30N against Si3N4 balls were 0.39, 0.46 and 0.38, with a lower value than that of AISI H13 steel under the load of 10N and 20N(0.65). The wear mechanism in the electrospark deposited YG8 coating could be mainly characterized by micro-abrasive wear, delamination wear and oxidative wear while the dominant wear mechanism for AISI H13 steel was a severe abrasive wear.

Study on Fretting Wear Behavior of 40CrNiMoA Steel

2010 ◽  
Vol 139-141 ◽  
pp. 447-451
Author(s):  
Zhu Jun Li
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Experimental Results ◽  
Fretting Wear ◽  
Wear Volume ◽  
Volume Increase ◽  
Test Parameters ◽  
Adhesion Wear

This study deals with fretting wear behavior of 40CrNiMoA steel on a SRVⅣoscillating friction and wear tester. The results indicate that with the frequency and load increasing, both the friction coefficient and fretting wear volume increase. With the amplitude increasing, the fretting wear volume increased too, but the effect of amplitude on friction coefficient was not simple positive correlation according to the experimental results. Meanwhile, the fretting wear mechanism is directly related to test frequency, load and amplitude. When they are small, the main fretting wear mechanism is abrasive wear, with these test parameters increasing, the main fretting wear mechanism turns to a combination of abrasive wear and adhesion wear. Based on the experimental results, the anti-fretting wear measures of steel worm gear pairs used in mechanical tracked regulator of tracked vehicle are discussed.

Microstructure and Tribological Properties of a Ni-Base Laser Cladding on Aluminum Bronze

2010 ◽  
Vol 160-162 ◽  
pp. 100-105
Author(s):  
Jian Lin Xu ◽  
Bo Yang ◽  
Chun Yan Ju ◽  
Li Hui Zhang
Keyword(s):  
Wear Rate ◽  
Abrasive Wear ◽  
Laser Cladding ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Dry Friction ◽  
Wear Behavior ◽  
Solidification Rate ◽  
Aluminum Bronze ◽  
Lubricate Condition

In the paper, a Ni-base composite cladding was cladded on the surface of QAl9-4 aluminum bronze by laser cladding technology, as well as its microstructure and tribological properties are studied. The results show that the microstructure of laser cladding is affected by solidification rate, and its wear behavior mainly lies on microstructure and lubrication condition. The microstructure of laser cladding is made up of cellular crystal and dendrite crystal. The microstructure of the surface cladding is cellular crystal, the middle section is crassitude dendrite crystal, and the bottom is coarse dendrite crystal and cellular crystal. Under dry friction condition, wear mechanism is abrasive wear and shedding strengthen phase, which has higher volume’s wear rate. Under lubricate condition, wear mechanism is abrasive wear and adhere wear, which has lower volume’s wear rate than that of dry friction. The average friction coefficient of the cladding under dry and lubricate condition are 0.39 and 0.15, the volume’s wear rate are 7.88×10-8mm3/N.mm and 1.56×10-9mm3/ N.mm, respectively. Therefore, the cladding has favorable wear resistance property under lubricate condition，and can be used as an excellent wearable material.

Vanadium Additions to a High-Cr White Iron and its Effects on the Abrasive Wear Behavior.

MRS Advances ◽  
2020 ◽  
Vol 5 (59-60) ◽  
pp. 3077-3089
Author(s):  
Alexeis Sánchez ◽  
Arnoldo Bedolla-Jacuinde ◽  
Francisco V. Guerra ◽  
I. Mejía
Keyword(s):  
Heat Treatment ◽  
Abrasive Wear ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Wear Behaviour ◽  
White Iron ◽  
Heat Treated ◽  
Bulk Hardness ◽  
Abrasive Wear Behavior ◽  
Vanadium Carbides

AbstractFrom the present study, vanadium additions up to 6.4% were added to a 14%Cr-3%C white iron, and the effect on the microstructure, hardness and abrasive wear were analysed. The experimental irons were melted in an open induction furnace and cast into sand moulds to obtain bars of 18, 25, and 37 mm thickness. The alloys were characterized by optical and electronic microscopy, and X-ray diffraction. Bulk hardness was measured in the as-cast conditions and after a destabilization heat treatment at 900°C for 45 min. Abrasive wear resistance tests were undertaken for the different irons according to the ASTM G65 standard in both as-cast and heat-treated conditions under a load of 60 N for 1500 m. The results show that, vanadium additions caused a decrease in the carbon content in the alloy and that some carbon is also consumed by forming primary vanadium carbides; thus, decreasing the eutectic M7C3 carbide volume fraction (CVF) from 30% for the base iron to 20% for the iron with 6.4%V;but overall CVF content (M7C3 + VC) is constant at 30%. Wear behaviour was better for the heat-treated alloys and mainly for the 6.4%V iron. Such a behaviour is discussed in terms of the CVF, the amount of vanadium carbides, the amount of martensite/austenite in matrix and the amount of secondary carbides precipitated during the destabilization heat treatment.

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

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