The Wear on Roller Press Rollers Made of 20Cr4/1.7027 Steel under Conditions of Copper Concentrate Briquetting

This paper defines the wear process of rollers made of 20Cr4. Rollers with a diameter of 1000 mm were installed in a roller press used for the production of drop-shaped briquettes and the copper concentrate was briquetted for 1100 h. Three-dimensional (3D) geometry analysis, metallographic analysis, macroscopy, scanning electron microscopy, as well as hardness measurements were performed. It was observed that the working surface was non-uniformly worn. The smallest wear affects the molding cavities situated on the outermost edges of the ring. The wear increases as the center of the ring is approximated, and it reaches its maximum at the middle of the ring. The molding cavities also wear asymmetrically. For the shape considered in this study, the lower part of a cavity is subject to a higher wear rate. We found that the material of the working ring was carburized, but its hardness was significantly lower than required. The roller ring microstructure changes depended on the distance from the cavity’s face. An investigation of the wear mechanisms showed different types of abrasive wear, corrosive processes, and plastic deformation. The exact type and course of wear were described, depending on the location on the working surface.

Analysis of Counter-Rotating Roller Bearing in Different Mounting Configurations

Advanced engine configuration studies have shown large advantages for an engine with counter-rotating spools with intershaft counter-rotating roller bearings. Mounted on two counter-rotating differential-speed hollow rotors, the bearing internal kinetic behavior, dynamic behavior, and then thermal behavior change greatly, causing a severe challenge to engine designers using traditional analysis methods. A special quasi-dynamic model for counter-rotating roller bearing is proposed, considering rings deformation and windage effects, to analyze the bearing mechanical and thermal behavior in different mounting configurations. Roller sliding and bearing heat generation are calculated and compared with experimental data to verify the model capabilities. It shows that the configuration that connects the inner ring to the high-speed rotor has life cycle advantage with more uniform load distribution, smaller roller/ring clearance, and lower cage speed. This leads to less drag loss due to the rotation of the rollers and cage assembly. The decrease of the total power loss is a key element to minimize the quantity of oil required to lubricate the roller bearing.

The Disfigurement Repairing of Centrifugal Foundry Cast Iron Roller Ring Face

The casting disfigurement on the upper end-face of cast iron roller ring is easy to happen. The paper analyses the method of disfigurement repairing. The disfigurement of centrifugal foundry cast iron roller ring has been eliminated by strict processing technology. Rate of finished products of the cast iron roller ring is improved by repair welding as a result.

Design of Enclosure Assembly for Q450 Pellet Molding Machine Based on Solidworks

In this paper, Q450 pellet molding machine with plunger-roller ring die has been designed by employing the CAD/CAE system, Solidworks, and the load conditions of three molding assemblies fixed inside have also been studied. Then a method of FEA was conducted to research the mechanical properties of enclosure assembly for this pellet molding machine in Simulation, which is a FEA module of Solidworks. As a analysis result, the maximum stress and displacement of enclosure bodies are separately 31.37Mpa and 7.583e-2mm, that convincingly verifies enclosure assembly has reliable strength and stiffness, which ensures that Q450 pellet molding machine has enough reliability and security.

Thermal Structure Coupling Analysis of Universal Mill’s Horizontal Roller Ring Based on ANSYS

Based on the situation that universal mill’s roll rings appeared broken roller accident in actual production, the paper put the horizontal roll ring of universal mill as the research subjects. The thermal structure coupling field of horizontal roll ring reaches a dynamic equilibrium and the stress distribution of horizontal roller ring and finds the most dangerous parts of the roller ring is rolling groove. This study provides a solid foundation for further research of the roller ring strength, deformation and fatigue life.

Research on the Fatigue Life of Universal Mill Horizontal Roller Ring Applying Fe-Safe

In addition to the consumption caused by wear,thermal cracking and flaking,the roller ring of universal mill often occurs the roll-off accident in the rolling production. In this paper,put universal mill’s horizontal roll ring as the study subject, analyze its fatigue life using fe-safe software and estimate the fatigue life of roller ring, which has a certain reference value for the Time selection of Roll change and roll grinding .

Data-driven state detection algorithm for multi-scale systems and its application

To improve the security and reliability of equipment and reduce their failure rate, a data-driven state detection algorithm was proposed. The concepts of multi-scale system, multi-scale entropy and multi-scale exergy were defined. The algorithm is used for multi-scale systems whose state parameters change over time and have the characteristic of increasing monotonically on a dominant scale. An abrasion index for the middle speed roller ring mill was constructed, which was used to monitor the states of the instruments. Noise that affected the accuracy of the results was analyzed. The results of simulation experiments demonstrate the effectiveness of the algorithm, which can provide a technical basis for condition maintenance.