Calculate values of the yield strength, Mechanical Engineering

Assignment Help:

Your company received an order to machine a batch of 150 steel parts that are 73.0 mm in diameter and 250 mm in length. One of the processes is a finish turning operation. Where the feed is 0.30 mm/rev, and depth of cut is 3.5 mm. You were assigned to select the cutting tools for this operation. There are three tool materials available: high speed steel, cemented carbide, and ceramic. Your manager asked you to compare these tool materials. You found that for the high speed steel tool, the Taylor equation parameters are: n = 0.130 and C = 80 m/min. The price of the HSS tool is $20.00 and it is estimated that it can be ground and reground 15 times at a cost of $2.00 per grind. Tool change time is 3 minutes. Both carbide and ceramic tools are in insert form and can be held in the same mechanical toolholder. The Taylor equation parameters for the cemented carbide are: n = 0.30 and C = 650 m/min; and for the ceramic: n = 0.6 and C = 3,500 m/min. The cost per insert for the carbide is $8.00 and for the ceramic is $10.00. There are 6 cutting edges per insert in both cases. Tool change time is 1.0 min for both tools. The time to change a part is 2.5 min. The cost of machine time is $40/hr. The setup time for the batch is 2.50 hrs. The manager asked you to compare the three tooling cases, from the following points of view: (a) cutting speeds for minimum cost, (b) tool lives, (c) cycle time, (d) cost per production unit, (e) total time to complete the batch and production rate and (f) the proportion of time spent actually cutting metal for each tooling? (f) Which tool material would you recommend for the process? State other factors related to the workpiece specification that could influence your decision.

You were assigned to design the process a cold upset forge for cylindrical part that has 30 mm diameter and 30 mm height. You found that the shop has a hydraulic forging press that is capable of exerting a maximum force = 1,000,000 N.  You have conducted the proper test to determine the flow curve of the metal. You have found that K = 400 MPa and n = 0.2.  In order to go ahead with the process design, you needed to determine The maximum reduction in height to which the part can be compressed with this forging press. You have consulted a colleague about the value of the coefficient of friction for such a process, he advised you to use a coefficient of friction = 0.1.

When you presented the results to your manager, he asked you the following questions:

1. How did you determine K and n for this material?

2. What are the values of the yield strength and ultimate tensile strength of this material?

3. What is the maximum reduction in height to which the part can be compressed with this forging press?


Related Discussions:- Calculate values of the yield strength

Can you use motor oil in a hydraulic system, Hydraulic fluid has to pass a ...

Hydraulic fluid has to pass a dissimilar set of standards than motor oil. Motor oil has tackifiers, lower sulfur content, and other ingredients that could solve harmful to the seal

Evaluate the gyroscopic couple, The turbine rotor of a ship having a mass o...

The turbine rotor of a ship having a mass of 200Kg moves at 200 r.p.m and its radius of gyration is 0.30 m. If the rotation of the rotor is clockwise looking from the aft., evaluat

Multiple spot welding, Multiple Spot Welding This is a modification of sp...

Multiple Spot Welding This is a modification of spot welding, in which two or more than two welds can be obtained simultaneously from each transformer secondary. For specific pro

#title VECTORS, The 70m microwave transmission tower is steadied by three g...

The 70m microwave transmission tower is steadied by three guys cable. Cable AB carries a tension of 12kN. Express the corresponding force on point A as a vector

Can you explain limitations of eulers theory, (a) Can you explain limitatio...

(a) Can you explain limitations of Euler's theory (b) Derive a mathematical expression to determine the crippling load of a column with on end fixed and other end hinged (c)

Sizing a solar pv system, The Rusk's own fairly large house near San Franci...

The Rusk's own fairly large house near San Francisco and the following spreadsheet shows their month to month power use for two years.  1. What is their monthly average power us

Polythionic Acid Stress Corrosion Cracking, In Naphtha Hydrotreating Unit, ...

In Naphtha Hydrotreating Unit, does feed/effluent heat exchangers require passivation to avoid polythionic acid stress corrosion cracking.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd