Key Engineering Materials Vol. 501

Abstract: Carbon black has been used as the main reinforcing fillers that increase the usefulness of rubbers. In this experiment, different compounds based on natural rubber were prepared with carbon black (N330) at various loading ratios from 10 to 125 phr. The mechanical and thermal properties of rubber compounds were measured and the test data with SEM micrographs were analyzed to determine the suitable ratio of carbon black for the desired properties of rubber compound. The results showed that carbon black particles were well dispersed in compounds with loading ratios of 25-30 phr, corresponding to maximum tensile strength values. While with the increase of carbon black content, heat conductivity kept sustained increase. Fractal dimension characterized the degree of uneven dispersion of carbon black in rubber fracture surfaces. A particular value of fractal dimension was obtained to characterize the optimum mechanical property of carbon black filled natural rubber. The thermal property and fractal dimension demonstrated same variation tendency.

Abstract: Introduced the pneumatic conveying devices and conveying principles when conveying phase is about pulsed solid-plug, analyzed the flow action of solid-plug and the relationship between the conveying parameters while conveying, provided a reference for the correct design and use of this type of pneumatic conveying system.

Abstract: To tire building machine hot knife , for example, the heat set temperature, flank contact temperature and flank edge temperature were determined and analysis, finite element method for heat transfer simulation calculations. After experimental verification, simulation and prediction of flank and edge temperature consistent with the measured data. Experiments show that the temperature can effectively control the heat source to control the temperature of a specific area, so not for the excess heat to meet the processing requirements to achieve efficient use of energy.

Abstract: The belt ply plays an important role in the performance of radial tires, and makes the adhesion strength among rubber steel cords of the belt ply become the focus of recently research. This paper focuses on the study of the theoretical analysis of the force on the belt ply, obtaining the relationship between the size of the load at the single steel wire and the outside load and the steel wire’s deformation on a single steel wire. Taking advantage of the software ANSYS Workbench 13.0, we carried out the simulation analysis of the single steel wire, and intuitively showed you the deformation and stress of belt ply’s steel wire under the different forces, providing theoretical basis and reference value for further researches on the adhesion fatigue life of rubber steel wires.

Abstract: The high temperature in grinding hardening induces workpiece thermal deformation. The thermal deformation causes a concavity on the ground profile and affects the grinding hardening depth. The paper uses ANSYS thermo-mechanical coupling module to simulate the thermal deformation in grinding hardening. The workpiece profile by simulated is compared with the test result.

Abstract: It’s important to recognize carton black in rubber image for detecting carton black dispersion. This new method adopts special algorithm that depends on rubber image’s character to optimize background color of rubber image and make carton black clearer. In addition, this method can distinguish some abnormal factors through calculating oblate degree of white region. Application of this new method is useful for getting exact information of carton black and supplying correct data for evaluating carton black dispersion.

Abstract: With the computational fluid dynamics (usually being called “computational fluid dynamics” for CFD) method, the velocity field between the air nozzle and the filtering bag and the velocity distribution inside the filtering bag are computed when changing the distance between the air nozzle and the filtering bag. And the pressure distribution inside the filtering bag is also computed at different injecting times. According to the simulation result, this article has analyzed the influence of different distances between the air nozzle and the filtering bag and different injecting times on the dust-cleaning effect, and supplied theoretical basis to design the optimal pulse bag filter.

Abstract: Abstract: It is important to understand the mechanisms of the granular agglomeration and take the appropriate anti-agglomeration methods for the preparation and application of ultra-fine powder. In recent years there have been various agglomeration mechanisms and anti-agglomeration methods in granulation, with more and more researchers having devoted themselves to this case. This review critically evaluates the soft and hard agglomeration mechanisms and the anti-agglomeration methods in liquid and gas phase, put forward up to now. The granular agglomeration behavior can’t be explained well by the existing mechanisms and avoided completely by the existing anti-agglomeration methods. It is urgently for us to have a deeper insight of the theory of agglomeration and take the comprehensive anti-agglomeration methods.

Abstract: The contrastive analysis and the linear optimization on the transverse plane linear of triple thread single-screw pump are used for outer equidistant curves of curtate hypocycloid and inner equidistant curves of curtate epicycloids. MATLAB programming language is used to solve the equations and plot linear, and express the analysis results intuitively. When the numeric area of variable amplitude coefficient is determined, it can get the relationship of overflow area with the variable amplitude coefficient k = e / r. So the analysis offers a reference for further study in triple thread single-screw pump.

Abstract: The mechanical properties and optimum vulcanization times are measured for various rubbers used in the 11.00 R20 S815 all-steel radial tire. Results show the optimum vulcanization time of various rubbers differ a lot from each other, with distinctively different start and ending time of tyre curing process and the duration of the optimum vulcanization stage. The difference, however, are beneficial to the uniformity of the vulcanization degree of tire. The rubbers have best mechanical properties at or near the optimum vulcanization area, while showing weaker properties at under-vulcanization or over-vulcanization stage. The HTME rubber used in tyre tread has minimum abrasion volume under optimum vulcanization stage, while giving increased abrasion volume data under shortened or enlengthened vulcanization time.