International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Modern armor steels are essential in safeguarding military and civilian assets from ballistic threats. This paper provides a comprehensive classification of contemporary armor steels, examining their material properties, including hardness, impact resistance, and the influence of chemical composition, particularly carbon equivalent (CE), on their performance. The classification considers chemical composition, alloying elements, and mechanical properties, with a focus on their ballistic effectiveness and suitability for various armored platforms. Additionally, the paper delves into the historical evolution of armor steel, tracing its origins from early military applications to the sophisticated alloys used today. It also highlights the importance of MIL-DTL specifications in establishing a standardized language for armor steel grades, ensuring uniformity in quality and performance across the defense sector. Furthermore, the paper discusses the role of heat treatment procedures, such as quenching and tempering, in influencing the microstructure and mechanical properties of armor steels, directly affecting their resistance to penetration and impact. Through a review of armor steel classifications, historical context, and their technological advancements, this paper offers valuable insights into the ongoing efforts to improve the performance and reliability of armored materials.

Due to the pandemic conditions we have been in in recent years, the need for disinfectant products in the hygiene sector has increased considerably. In this context, in order to meet the disinfectant wet wipes demand, the need to make the existing wet wipe production machines work with alcohol has arisen. In project scope; Wet wipes packaging machine, which is suitable for working with isopropyl alcohol, meets all the necessary conditions and is equipped to prevent the danger of explosion, was built.. Also the equipment to be used within the scope of the project and activities to be performed in the context of the new designs that will be revealed thanks to the alcohol completely reliable and relevant about working with the institutions and approved and fully ATEX compliant packaging machine, wet wipes faster than peers will emerge. By avoiding all possible risks, all possible problems that are undesirable, endanger human health and cause work accidents were prevented.

A headbox of a machine producing a paper sheet has a slice opening controlled in response to signals indicative of total head of fluid in the headbox, the rate of flow of a paper slurry into the headbox and the speed of a inclined wire headbox receiving a jet of slurry emerging from the headbox slice. The slice opening is controlled to affect formation of the paper sheet on the wire. Consistency of the slurry being fed into the headbox is varied to control the position of a dry line on the wire or formation of fibers on the wire. The level of liquid in the headbox is maintained at a predetermined level by a controller. The slice opening is controlled in an anticipatory manner to compensate for the slow response of the total head in the headbox to changes occurring in response to the slurry mass flow rate into and out of the headbox. Since the double flap structure used as the control mechanism is hinged to each other, they move relative to each other, which creates an obstacle in keeping the flap positions constant. Forward kinematic calculations were tried to be made using the angle sensor, but since the sensor resolutions could not respond to small movements due to the size of the flap lengths, the final flap positions were determined by performing inverse kinematic calculations according to the servo motor positions.