The paper presents the results of tests wear hardened wear-resistant steels in presence quartz, coal and coal-mineral abrasives a differentiated ratios each component case without abrasives. were carried out on ring-on-ring test stand. Volume loss was parameter used to characterize level. Based Scanning Electron Microscopy (SEM) observations, different mechanisms surface destruction depending t...

Aluminium metal matrix composites reinforced with SiC and B4C particles are a unique class of advanced engineered materials that have been developed to use in high strength , high wear resistant and tribological applications. The conventional techniques of producing these composites have some drawbacks. In this study, the aluminium hybrid composite is fabricated using stir casting method. 10 % ...

In this study, the relationship between skin structure and shear strength distribution of thin-wall injection molded polypropylene (PP) molded at different molecular weight and molecular distribution was investigated. Skin-core structure, cross-sectional morphology, crystallinity, crystal orientation, crystal morphology and molecular orientation were evaluated by using polarized optical microsc...

CoCrFeNiTax (x = 0, 1) coatings were prepared on the surface of TC4 by laser-cladding to improve corrosive wear property and extend its service life in media, ultimately aiming performance. The effects Ta addition phase constituent microstructure first investigated. Given wide application media (even undergoing friction), covered with was especially focused two (neutral alkaline). results showe...

The characteristics of the cutting forces were studied at different usage levels and the analytical model of the micro-end-milling operations was modified to represent the tool wear. A new expression was derived from the model to estimate the remaining tool life from experimental data. The parameters of the model are estimated by using genetic algorithms. The difference between the simulated an...

In Part II of this paper, a cutting force model for the micro-endmilling process is developed. This model incorporates the minimum chip thickness concept in order to predict the effects of the cutter edge radius on the cutting forces. A new chip thickness computation algorithm is developed to include the minimum chip thickness effect. A slip-line plasticity force model is used to predict the fo...

A mechanistic model for the micro-endmilling process is developed that explicitly accounts for the different phases while machining heterogeneous materials. It is shown that frequencies in the cutting force signal higher than those that can be explained by the kinematics of the process can be explained by considering the multiple phases in the material. Experiments are performed on two composit...

During the micro-drilling process of stainless steel, the wear, fracture, and breakage of the micro-drill easily occur. Micro-drill geometry parameters have significant influence on the drilling performance of the micro-drill. Nowadays, the helical point micro-drill is proposed and its improved drilling performance is validated by some researchers. In this study, to analyze the effect of geomet...

At present, for micro-textured tools, the determination of micro-texture placement area depends on derivation cutting geometric model. The distribution form applies methods, and research methods accuracy are limited. Therefore, in this paper, ball-end milling cutter is taken as object. Based fractal theory, morphology tool before after wear compared to determine tool–chip contact area. uniform-...