Forthcoming and Online First Articles
International Journal of Mechatronics and Manufacturing Systems
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International Journal of Mechatronics and Manufacturing Systems (3 papers in press)
Abstract: This article discusses the relevance of two-colour pyrometers single channel signals for process monitoring of laser powder bed fusion metal additive manufacturing. First, examples are presented where the ratio temperature provided by the pyrometer is misleading. Following is a demonstration that such instances can be uncovered by the single channel signals, where an approach for simplified signal analysis based on the working principles of the pyrometer is provided. In closing, a validation is implemented, where the careful inspection and employment of the single channel signals yielded suitable input for a successful closed-loop process control.
Keywords: additive manufacturing; laser powder bed fusion; pyrometer; process monitoring; process control.
Multistage tool path strategy to produce hemispherical shape using single point incremental forming process
by Ashish Gohil, Bharat Modi
Abstract: In a single point incremental forming process, components are produced by moving the hemispherical ended tool along the predefined tool path. Single-stage tool path strategies are used to form the components but it leads to problems related to formability, geometric accuracy, and non-uniform thinning especially in the case of components having a high wall angle. A multistage forming strategy can be used to improve the same. However, it leads to an issue like the formation of the stepped feature due to rigid body translation. In this paper, the multistage tool path strategy has been proposed to circumvent the issue related to stepped feature formation for hemispherical shape which is difficult to produce using a single-stage forming strategy due to 90 degree tool entry angle at the base. The hemispherical component is formed successfully using the proposed multistage forming strategy without the formation of protrusion defect. Moreover, the proposed strategy doesn't require the calculation of rigid body translation and toolpath modification. Results from the experimental and numerical investigation have been presented in this paper. The limiting value of percentage increase in surface area during the stage is found to be 30. Enhancement in formability using proposed multistage forming strategy, in terms of depth of forming, uniform strain distribution and thinning have been presented.
Keywords: Incremental Sheet Forming(ISF); Single Point Incremental Forming(SPIF); Multistage tool path; Thinning band; Strain distribution; rigid body translation; protrusion defect.
Analysis of the effects of operator experience and learning in laser sintering
by Ageel Alogla, Martin Baumers, Christopher Tuck
Abstract: Recent research into the cost performance of various Additive Manufacturing (AM) processes indicates that one important barrier is the extent of manual labour inputs required by the process. To explore this aspect, this study focuses on the experimental measurement of the AM operator time and improvement in operator effectiveness due to learning. Learning is assessed in two ways: First, this article measures the reduction of labour time resulting through operator learning within a series of build repetitions and estimates a progress ratio capturing the learning effect within this series. Second, this article assesses the impact of overall operator experience by comparing the labour time required by a novice operator and an expert operator. The results suggest that AM exhibits a learning effect for both the novice and the expert operator with progress ratios of 67.73% and 80.42% respectively.
Keywords: Additive manufacturing; 3D printing; learning; economies of scale; resource-based view; learning rate; learning curve.