International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The results of tribological tests of the active area of harrow disks with coatings obtained by the plasma spay thermal method are presented. This study is based on scanning electron microscopy of coated harrow disc samples undergoing standard tribological tests that focuses on the mechanical properties of coatings using tribological methodology. Tribological studies were conducted to determine the following main parameters of the harrow disc material such as: adhesion to the substrate, coefficient of friction, Young’s modulus, stiffness and hardness of coated samples and the base material. As the result, improving the mechanical and chemical properties of materials used to manufacture the working bodies of coated harrow discs allows for increased resistance to abrasive wear in modern agricultural machinery.

This study presents a comparative analysis of three types of coatings taken from the active area of the coted harrow disks using atmospheric plasma spray deposition method (APS). The resulting coatings increase the durability of the harrow discs and the inclusion in the componence of coatings of carbides and powdered ceramic compounds will enhance the mechanical characteristics. This study focused on scanning electron microscopy of the coated samples from the harrow discs and their tribological properties. SEM imaging and EDS analysis have been carried out to clarify the morphological characteristics and study of disc cross-section. Tribological tests were carried out to determine the following main parameters: adhesion to the substrate, coefficient of friction (COF), modulus of elasticity and hardness of the material.
The development and implementation of modern technologies for improving the mechanical and chemical properties of materials for
coated harrow discs will increase resistance to abrasive wear in modern agricultural conditions.

The article proposes a classification based on the method of movement of the working parts of the planting apparatus, which identifies three groups of transplanting machines: with the movement of the working parts in a vertical plane, a horizontal plane, and a combined method. The speed of planting seedlings depends on the following main factors: the frequency m of seedling supply, the planting step l, the design of the planting apparatus with seedling holders, the condition of the planting material, as well as the experience and skill of the planting operators. Feeding seedlings into seedling holders or cups of the planting apparatus is limited by the physical capabilities of a person, namely the number of seedlings fed per minute or frequency m. Thus, in order to increase the speed Vm of seedling planting, it is necessary to increase the frequency m of seedling supply. The speed of planting seedlings into cups or seedling holders (the frequency m) actually determines the maximum operating speed of the transplanting machine.
The study of the technological process of operation of a transplanting machine, as well as a phase analysis of the working process of a carousel-type transplanting machine, makes it possible to better understand ways to improve the design of the machine and its working parts and will make it possible to obtain important decisions on increasing the speed. As a result of a theoretical study of the technological process of a carousel-type transplanting machine, a relationship was obtained between various factors on which the maximum operating speed of planting seedlings depends.