Berk Korucu-030080104-4th Week

1) Metal Sawing (Manufacturing)


Previous Definition

The sawing of metal is one of the primary processes in the metal working industry, one in which chips are created bu a succession of small teeth, arranged in a line of a saw blade. The forces acting on the tool and material can be complex and are not as well researched and documented, for example, as in the turning process. Traditionally, sawing has been practiced as the last step in stores, but the math reveals that a far more productive approach is to view sawing as the first stage in manufacture. A quality modern metal saw is capable of fast, close tolerance cuts and good repeatability, and the sawing process itself is reliable and predictable. 


(Metal Shaping Processes, Boljanovic, p359) 




New Definition (Better)



Metal cutting: the process in which a thin layer of excess metal (chip) is removed by a  wedge-shaped single-point or multipoint cutting tool with defined geometry from a  workpiece, through a process of extensive plastic deformation.


( L. Juneja, N. Seth, Fundamentals of metal cutting and machine tools, p65)


2) Concept Selection (Management)


Previous Definition (Better)


Concept selection is the process of evaluating and comparing alternative concepts with respect to the customer/marlcet needs and design specifications, leading to the selection of the most suitable one or a set of concepts for further investigation and/or development. Concept selection can be performed according to the following guidelines:
• Select Solution Principles
Suitable solution principles that can satisfy the needs are selected individually or in combination with other solutions. Selected solutions should be able to perform the required function effectively and efficiently. 
• Combine Solution Principles into Complete Design Concepts
The selected principles in the previous step are arranged into a complete conceptual design that corresponds to the overall function, that is, concepts that correspond to sub-functions are arranged together to form a larger concept that can accomplish the overall function.
• Evaluate Concepts Technically
Concepts are now evaluated with respect to the degree to which they meet the design specifications; concepts that do not meet the specification are eliminated at this point.
• Evaluate Concepts Economically
Concepts are evaluated with respect to their cost, that is, concepts are investigated for their economic feasibility. Non-feasible concepts with unjustified high costs are eliminated.
• Select Final Concept
A final decision must be made among technically and economically feasible concepts by utilizing a scoring technique that can incorporate needs and customer satisfaction.

(Computer-Based Design and Manufacturing, Emad Abouel Nasr, Ph.D. Ali K. Kamrani, Ph.D., p15) 



New Definition



Concept Selection is one of techniques being taught in the Master Systems Engineering. The
technique is applied when needs of stakeholders and requirements have been collected. The idea behind Concept Selection is that a good solution is achieved by analyzing a few alternating designs and comparing them by a set of criteria that fits the problem. We observe in practice that managers and engineers tend to skip this phase and prefer to jump into a realization. The perception is that Concept Selection is time consuming, spending time on it can not be afforded. From the discussion it became clear that we have to show more clearly how Concept Selection improves the development effort, rather than slows it down.


(G. Muller, Concept Selection; Theory and Practice, p7)