Question

In: Mechanical Engineering

Write an executive summary on Ernst-Merchant Chip Formation theory and its practical applications in machining industries....

Write an executive summary on Ernst-Merchant Chip Formation theory and its practical applications in machining industries. (Hints: draw the free-body diagram and the force circle at the cutting edge, label all important parameters, explain the theory based on the minimum cutting force; show its importance on energy consumption and economy in mass production. (2 pages, single space, single column); use an abstract, divide the paper in headings and subheadings, and a conclusion or final remarks (summing up).

Solutions

Expert Solution

fi=(pi/4) - (1/2)(tau - alfa)- the basic relation from Merchant theory of metal cutting.

Conditions for the relationship above to be true:

fi- shear angle which it is adjusting itself to result minimum work
tau- friction angle which is independent of fi and is constant
the edge of the tool is sharp
the distribution of the shear force and normal stress is uniform, in the shear plane
the part material is rigid and plastic
the width of the generated chip is constant

After experimental work, the relationship above was found to be over estimated, so that Merchant modified it and the result was another relationship:

2*fi +tau - alfa=C, C being the machining constant. In order to C<PI/2, grain size and the micro structure has to remain constant after the material is manufactured.

The normal force Fn, which is acting in a direction perpendicular to the shear plane, is changing due to the deformations and frictions.The normal stress affects the shear stress, in the shear's direction.

theres a lot of practical appication of ernst and merchant theory in machining industries:

1> design of machine stiffness for machine tolerance.

2>whether workpiece can withstand cutting force predicted.

3>in studying behaviour and machinability of material.

4>estimation of power consumption in cutting.

samet mamat answered 2 years ago
Next > < Previous

Related Solutions

Write an executive summary about separation of church and state.
Write an executive summary about separation of church and state.
As a business economist, write a detailed critique of the monopoly theory considering the practical and...
As a business economist, write a detailed critique of the monopoly theory considering the practical and real-world issues of the market structure in an economy. Your discussion must be supported by relevant practical examples and must unpack concepts such as economies of scale, creative destruction and rent-seeking behaviour by monopolies.
When do we write an executive summary of a business plan - at the beginning or...
When do we write an executive summary of a business plan - at the beginning or at the end of writing a business plan? Why?
write reflection about data mining theory and applications course
write reflection about data mining theory and applications course
Write an executive summary about the different implications of running a company within or outside the...
Write an executive summary about the different implications of running a company within or outside the European Union.
Walkenhorst Company’s machining department prepared its 2019 budget based on the following data: Practical capacity 40,000...
Walkenhorst Company’s machining department prepared its 2019 budget based on the following data: Practical capacity 40,000 units Standard machine hours per unit 2 Standard variable factory overhead $3.00 per machine hour Budgeted fixed factory overhead $ 360,000 The department uses machine hours to apply factory overhead to production. In 2019, the department used 85,000 machine hours and incurred $625,000 in total manufacturing overhead cost to manufacture 42,000 units. Actual fixed overhead cost for the year was $375,000. Required: Determine for...
Walkenhorst Company’s machining department prepared its 2019 budget based on the following data: Practical capacity 40,000...
Walkenhorst Company’s machining department prepared its 2019 budget based on the following data: Practical capacity 40,000 units Standard machine hours per unit 2 Standard variable factory overhead $3.00 per machine hour Budgeted fixed factory overhead $ 336,000 The department uses machine hours to apply factory overhead to production. In 2019, the department used 86,800 machine hours and incurred $602,000 in total manufacturing overhead cost to manufacture 42,170 units. Actual fixed overhead cost for the year was $351,000. Required: Determine for...
Walkenhorst Company’s machining department prepared its 2019 budget based on the following data: Practical capacity 40,000...
Walkenhorst Company’s machining department prepared its 2019 budget based on the following data: Practical capacity 40,000 units Standard machine hours per unit 2 Standard variable factory overhead $3.00 per machine hour Budgeted fixed factory overhead $ 368,000 The department uses machine hours to apply factory overhead to production. In 2019, the department used 88,000 machine hours and incurred $636,000 in total manufacturing overhead cost to manufacture 43,000 units. Actual fixed overhead cost for the year was $380,000. Required: Determine for...
Walkenhorst Company’s machining department prepared its 2016 budget based on the following data: Practical capacity 40,000...
Walkenhorst Company’s machining department prepared its 2016 budget based on the following data: Practical capacity 40,000 Units Machine hours per unit 2.00 Variable factory overhead $3.00 Per machine hour Fixed factory overhead $392,000 The department uses machine hours to apply factory overhead. In 2016, the department used 85,400 machine hours and $653,000 in total manufacturing overhead to manufacture 42,030 units. Actual fixed overhead for the year was $399,000.    Required: Determine for the year: 1. The variable, fixed, and total...
Compare the 2019 Days on Hand results for Hasbro and Mattel Armour. Write an executive summary...
Compare the 2019 Days on Hand results for Hasbro and Mattel Armour. Write an executive summary (use the model provided) detailing the daily Cost of Goods Sold, respective days of inventory for 2019 and the potential financial impact if the under-performing company could match the Days on Hand measure of the higher-performing company (by improving processes so that they would require less inventory to operate). Assume a 25% carrying cost ratio.
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT