Papers by Keyword: Internal Surface

Abstract: The study focuses on analyzing the interior surfaces of the component responsible for directing projectiles during discharge. This investigation involves a detailed assessment of the chamber's internal condition, aiming to uncover any signs of wear, erosion, or deformation that could impact performance and safety of use. In the study, results from surface analysis of cut fragments taken from eight selected locations of the examined object were utilized. The samples were scanned using the ATOS Compact Scan 5M portable 3D scanner. Subsequently, a geometric model of the sample’s surface was created using CAD software and compared with the scan data through ATOS Professional software. The resulting surface maps enabled the evaluation of the scale of erosion on the sample surfaces and facilitated the analysis of the destructive mechanisms occurring during the object’s operation. Surface roughness measurements were conducted on 2x2 mm areas of the samples using a Hommel-Etamic T8000RC stationary profilometer. According to ISO 25178, three-dimensional surface maps were obtained, allowing for a detailed description of surfaces condition and the mechanisms occurring at the analyzed areas . The evaluation employs advanced imaging SEM, EDS and measurement techniques to ensure a comprehensive understanding of the structural integrity and functional state of this crucial element in the armament assembly.

Abstract: Abrasive flow machining (AFM) is one of the most promising technologies for internal finishing and de-burring for features with complex geometry. This study investigates the effect of media degradation on finishing characteristics achieved using the AFM process. A total of 50 experiments, using Inconel 718 cylindrical coupons machined by Wire-Electron Discharge Machining (WEDM), were conducted employing the same process conditions while using a single batch of AFM media. Experimental results indicate that media degradation has minor influence on surface roughness, but more significant influence on material removal and media flow rate. Material removal decreases exponentially with increasing cumulative media flow volume despite media flow rate increasing. There is a linear correlation between material removal and media flow rate. As a result, material removal can be estimated from media flow rate which can be monitored easily.

Abstract: Magnetic finishing is a new machining technology. It was widely developed for its high productivity and quality, especially its better flexibility and self-sharpness finishing tools. As a new material, Nd-Fe-B with high magnetic energy makes the internal finishing easier. Being used as permanent magnetic pole to finishing the surface of workpieces instead of solenoid, it makes the structure of magnetic pole more compact and the techniques adaptability better. Internal finishing using permanent magnetic pole is mainly discussed in this paper: a new technology to finishing the middle/small or deep hole using permanent magnetic pole is provided; a new kind of pole is developed, lots of experiments have been completed ,the roughness of internal surface is decreased from Ra0.8μm to about Ra0.3~0.1μm. The data prove that internal finishing using permanent magnetic pole is ideal technology.