Experimental Wear Behavior Analysis of Coated Spindle Hook Teeth under Real Harvesting Work Conditions.

Yanqing Gu,Xiuqing Fu,Jun Wang,Longchang Zhang,Hongwen Zhang,Lei Wang,Zhaoyang Song,Zhenyu Shen

doi:10.3390/ma14102487

Yanqing Gu, Xiuqing Fu + Show 6 more

Open Access

https://doi.org/10.3390/ma14102487

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Abstract

This study aimed to investigate the wear failure changes of spindle hook teeth and the reasons for such failure during field work. Spindle samples were obtained from a fixed position of the spindle bar under different field picking area conditions and combined with the spatial distribution characteristics of cotton bolls in Xinjiang. After cutting a spindle sample, a scanning electron microscope and an energy spectrum analyzer were used to characterize the micromorphology and element composition of the hook tooth surface and cross section under different working area conditions. The wear parameters of the hook teeth were then extracted. The results showed that the thickness of the coating on the surface of the hook tooth used in this study was between 66.1 µm and 74.4 µm. The major chemical element was chromium, with a small amount of nickel. During the field picking process, failure of the coating on the surface of the hook teeth initially appeared on the tooth tip and tooth edge, and then spread to the entire hook tooth surface. The wear failure of the hook teeth resulted from abrasive wear, oxidative wear, and fatigue peeling. As the picking area increased, the wear area of the hook teeth increased exponentially, while the wear width increased linearly. When the field picking area reached 533.33 ha, the maximum change rate of the wear area was 2.33 × 103 µm2/ha, and the wear width was 1.84 µm/ha. During field work, the thickness of the coating decreased from the cutting surface to the tooth edge, and the wear rate gradually increased. The wear rate at Position 1 was the slowest, at 0.01 µm/ha, and the wear rate at Position 5 was the fastest, at 0.25 µm/ha.

Highlights

As an important cash crop, cotton is highly valued by governments worldwide [1,2,3,4]
This study provides a reference for further exploration of the wear failure mechanism of spindle hook teeth during field work, and provides a basis for strengthening the surface of a spindle hook tooth
We cut the spindle to produce specimens that were convenient for microscopic observation and conducted scanning electron microscopy (SEM) to characterize the changes in the surface and cross section of the hook teeth during field work

Summary

Introduction

As an important cash crop, cotton is highly valued by governments worldwide [1,2,3,4]. In his research on the wear mechanism of a spindle during field work, Zhang found that the wear failure of spindle hook teeth is primarily caused by the combined actions of abrasive wear and oxidative wear [23]. Zhang adopted random sampling to collect spindle specimens from the field He disregarded the fact that differences existed in the wear of spindle hook teeth from the same bar at various installation heights during the field picking operation of the cotton picker. He did not consider the spatial distribution of cotton in Xinjiang.

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