Planned action items
My plan was to read Anand’s paper the way Dr. Mistree had asked me to in the email and also read a chapter from the more focused rolling book.
Achieved action items
I have tried to gain a thorough understanding of Anand’s paper on sequential, goal oriented manufacturing process, which has now been published.
As Anand was telling me, skimming is a very good technique but it takes a lot of experience to get good at it. I would say I have just taken a very small step towards that.
Table 2: Self-evaluation
Competencies that you wanted to develop and the progress in that
- Increase the conceptual understanding of the hot rod rolling process
- Get better at reading the research papers
Lessons learned (from modeling side, based on papers read and any minute information that you found useful and new)
It is very important to be away from all kinds of distractions when trying to read a research paper. This is especially in my case because of no prior information, I have to stay focused continuously so that I can continue to comprehend step by step.
Overall feeling (was there too much work load and any changes that you prefer)
I could have been more productive this week but there are a few other new things I am trying which was affecting my productiveness.
I find myself to be more productive when I am in the lab so I will try to be there every morning and get going.
I need to get faster at reading. I found that I was very slow while making progress in reading.
Phase 1 – Title, abstract and closing remarks
The title seems to be very convoluting, especially for me because it is so long. Also, it has numerous unfamiliar terms. However, some of these are clarified in the abstract.
Hot rod rolling is a 4 step sequential manufacturing process where a lot of variables affect the end result. Each stages have their own variables that need to be interpolated going backwards, starting at the end product. This why, Anand has come up with an inverse design method for the flow of these variable information that can fit any manufacturing process. He uses the hot rod rolling as an example in this paper.
In order to show this, Anand uses empirical models and response surface models which he had developed using the finite element software. He also uses the compromise Decision Support Problem to “support the integrated information flow” (I don’t understand the quoted). The real goal at the end of the manufacturing cycle is to improve quality, productivity, performance and reduce the cost.
I think it is very unique way to look at a problem but is also intuitive as the different stages are interdependent.
Phase 2 – Frame of reference
After reading the frame of reference, the importance of the title is visible. Each word plays a key role in this paper. A lot of things from the abstract are restated here.
A demand for more enhanced properties of steel brings about a challenge. It is an even bigger challenge when things from laboratory have to be scaled up to the manufacturing level. This is when various operation constraints are introduced into the production. These constraints also change depending on the stage we are interested in.
The cDSP modelling helps in the exploration of the solution space. Ternary plots are a way of showing this solution space.
Anand is going to first define different things like the hot rolling process and the cDSP and then demonstrate the problem by defining the variables. Different models will be developed and on the basis of that ternary plots will be made.
Phase 3 – write down key points, how each section connects to the next and what info is passed?
- Rolling is a multidisciplinary process involving reheating, interstand operations, mill engineering, roll pass design and metallurgical transformations
- It is a complex process because of the high temperatures and the requirement to control the process parameters to obtain the desired microstructure and properties.
- Anand is designing the multiple stages of a rolling system so that the information can between the different stages to reach the end product.
- cDSP tries to manage the uncertainty associated with the manufacturing process.
- As a designer, your role to make decision based on the present uncertainties.
- A good/robust design is when the design does not change with uncertainties.
- We have to get the solutions from the ternary plots.
- cDSP helps you to look at various solution, provide a weightage to each of the solutions and help you rationalise the best one. This is so that you can explore the various options you have in the solution space.
The introduction to hot rolling process is important in setting up the whole problem.
The concept of cDSP (section 3) is used in the designing the solution diagram (Figure 3) and implementing it solve to provide the information flow.
The crux of the paper is to explore the solution space by using the inverse method Anand has designed. The results of this method can be plotted in a ternary plot from where a designer can observe the various possibilities of solutions and then make the decision of implementing it any sequential, goal oriented manufacturing process.
- I have some questions marked on the paper, which are mostly related to me not understanding a specific term.
- Also, I feel like I understand the overall importance of cDSP and what it does but I am still confused about the various terms involved and calculation.