INVESTIGATION OF THE SURFACE TEMPERATURE OF A METAL-METAL POLYMER PART DURING FLAT GRINDING MACHINING

Knowing the exact heating temperature of a combined metal-metalpolymer part when processing flat grinding helps to assign cutting modes, as well as predict the durability of the processed part. Accurate monitoring of the heating temperature of the part during flat grinding allows to understand whether the temperature degradation of the surface layers of the metal polymer occurs, which can reduce the durability of the processed part due to burns of the surface layers. At the same time, accurate determination of the temperature in the cutting zone gives an understanding of the need for the use of cooling lubricants, which can not always be used without additional research when processing metal polymers with a diene matrix. The study of the temperature in the cutting zone is necessary because of the lower degradation temperature of the metal polymer relative to the metal. This article examines the process of flat grinding of a combined metal-metal polymer part using theoretical calculations, the method of finite element analysis, and analytical evaluation of the results of the experiment. The temperature in the cutting zone is estimated for the part-forming plate of the mold, which dictated the choice of a certain range of cutting modes that allow to obtain the required roughness of the plane of closing of the forming part.

STUDY ON STRUCTURE AND CRYSTALLIZATION OF POLYPROPYLENE GRAFTED MALEIC ANHYDRIDE/NANOCLAY COMPOSITE

Nanocomposite from polypropylene grafted maleic anhydride (PP-g-MA) and nanoclay were prepared by melt proccessing in Brabender extruder. XRD analysis shows the formation of nanostructure (intercalated and exfoliated) of nanocomposite with interlayer space (d-space) increasing from 26.3Å to 30.9Å. These structures, however, do not affect the microcrystalline structure of polymer part of nanocomposite in whole. The study on nonisothermal crystallization shows the development in 3-dimentional direction of crystallites, that means spherulite form of crystalline structure.