Jiaming Liu

Mechanized harvesting of oil tree peony fruit is an important condition for the industrialization of oil peony. It is of great significance to improve the self-sufficiency of edible oil and solve the contradiction between supply and demand of edible oil. However, the existing oil tree peony fruit harverster can only partly meet the needs of mechanized operation, but the cutting mechanism of the stem and cutting tool parameters is still lack of sufficient theoretical research, and the optimal design of the fruit harvester has not been realized. Therefore, this paper considered the oil tree peony stem as the research object, and carries out experimental research on the macro cutting mechanism, microstructure difference and shear deformation characteristics of the stem. Based on this, a stem cutting constitutive equation is established, and the key parameters of the cutting tool are optimized through the finite element simulation method, which provides a theoretical basis and technical support for the design of oil tree peony fruit harvester.

The windblown sand erosion wear and damage behaviors of the rail materials in windblown sand environment were investigated using a windblown sand erosion wear test machine, and the erosion wear and damage mechanisms of the rail in windblown sand environment were clarified. The rolling wear and damage behaviors of the rail in windblown sand environment were studied using a wheel-rail rolling wear and contact fatigue testing machine equipped with the device of the windblown sand environment simulation, and the rolling wear and damage mechanisms of the rail in windblown sand environment were also revealed. The interaction mechanism between sand particles and wheel-rail interface in windblown sand environment was clarified. Finally, the erosion wear resistance, erosion damage resistance, rolling wear resistance and rolling contact fatigue resistance of the rail materials with different hardness were compared and analyzed.

Le poly thyl ne ultra-haut poids mol culaire (UHMWPE) est appr ci pour son autolubrification, sa r sistance l'usure, sa r sistance la fatigue, etc. Une tude syst matique est men e sur les param tres du processus affectant la performance des roulements, qui comprend l' tude de simulation de la temp rature de pressage chaud, le traitement de meulage et l'ablation laser. La microstructure de la surface usin e a t observ e et analys e l'aide d'un microscope grande profondeur de champ et d'un microscope confocal laser. Les m canismes des deux m thodes de traitement ont t discut s et les param tres de traitement optimaux ont t donn s.

O polietileno de peso molecular ultra-elevado (UHMWPE) popular pela sua auto-lubrifica o, resist ncia ao desgaste, resist ncia fadiga, etc. realizado um estudo sistem tico sobre os par metros do processo que afectam o desempenho dos rolamentos, que inclui o estudo de simula o da temperatura de prensagem a quente, do processamento de moagem e da abla o a laser. A microestrutura da superf cie maquinada foi observada e analisada utilizando um microsc pio de super profundidade de campo e um microsc pio confocal a laser. Os mecanismos dos dois m todos de processamento foram discutidos e foram indicados os par metros de processamento ptimos.

Ultrahochmolekulares Polyethylen (UHMWPE) ist wegen seiner Selbstschmierung, Verschlei festigkeit, Erm dungsbest ndigkeit usw. beliebt. Es wird eine systematische Studie ber die Prozessparameter durchgef hrt, die sich auf die Leistung der Lager auswirken, einschlie lich der Simulationsstudie der Hei presstemperatur des Hei pressens, der Schleifbearbeitung und des Laserabtrags. Die Mikrostruktur der bearbeiteten Oberfl che wurde mit Hilfe eines Mikroskops mit gro er Tiefensch rfe und eines konfokalen Lasermikroskops beobachtet und analysiert. Die Mechanismen der beiden Bearbeitungsmethoden wurden diskutiert und die optimalen Prozessparameter angegeben.

Il polietilene ad altissimo peso molecolare (UHMWPE) popolare per le sue caratteristiche di autolubrificazione, resistenza all'usura, resistenza alla fatica, ecc. stato condotto uno studio sistematico sui parametri di processo che influenzano le prestazioni dei cuscinetti, che comprende lo studio di simulazione della temperatura di pressatura a caldo, la lavorazione di rettifica e l'ablazione laser. La microstruttura della superficie lavorata stata osservata e analizzata utilizzando un microscopio a super profondit di campo e un microscopio confocale laser. Sono stati discussi i meccanismi dei due metodi di lavorazione e sono stati indicati i parametri di processo ottimali.

Ultra-high molecular weight polyethylene (UHMWPE) is popular for its self-lubrication, wear resistance, fatigue resistance, etc. A systematic study is conducted on the process parameters affecting the performance of the bearings, which includes the simulation study of the hot-pressing temperature of hot press molding, grinding processing and laser ablation. The microstructure of the machined surface was observed and analyzed by using super depth-of-field microscope and laser confocal microscope. The mechanisms of the two processing methods were discussed and the optimal process parameters were given.