Among the engineering thermoplastics, poly(phenylene sulfide) (PPS) stands out for its excellent properties and mainly for processing at lower temperatures. The requirements requested by industries can be made by improving mechanical strength, weight reduction, and durable components by reinforcing the PPS matrix with fiberglass (FG) and carbon fiber (CF). This review intends to present the most current research related to the physical, mechanical, and thermal properties of PPS and the PPS/FG and PPS/CF composites most currently used by the aerospace, automotive, and energy industries. In addition to presenting the feasibility of mechanical and thermal recycling processes for PPS-based waste to reinsert a high market value thermoplastic into the industrial production cycle, thus contributing to the minimization of waste destined for landfills and incinerated or even improperly disposed of in the environment.
Currently, many industries are seeking to lower the use of lubricating fluids in machining processes without losing the quality of the workpieces, as an affordable alternative arises the possibility to applicate the minimal quantity of fluid technique (MQF). This study is focused on interpretation and evaluation of hardened SAE 4340 steel milling process using the MQF at different flow rates compared to conventional lubrication. With the implementation of a data acquisition system to measure the milling dynamic, it was possible to know all the present variations on the power rating during the process. After the tests, an appropriate statistical analysis of results was applied in order to better understand the effects of the MQF and correlate the output variables. Moreover, this project allows us to have an applicable vision of cutting process costs and study an important industrial material. As a result, the measurement and validation of the use of MQF in tangential and frontal milling process of hardened steels show good correlation with the dimension of carbide cutters wears and influence on the level of power rating, as it is detailed in this paper.
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