forming proceɛɛ. 18) rolling mill type are associated with relatively small diameter rolls in contact with the work piece. 19) Straining a sheet of metal around a straight axis is called 20) The extra portion which must be separated from the extrudate by cutting it just beyond the die exit is called 21) In sheet metal forming the area to volume ratio is considered to be mm. 22) In rolling, if the maximum dratt is 12 mm, & the coefficient of friction is 0.2, thus the minimum roll diameter is 23) The starting work piece in steel hot rolling of plate and sheet stock is called a 24) are 3 methods that can be used to control the

forming proceɛɛ. 18) rolling mill type are associated with relatively small diameter rolls in contact with the work piece. 19) Straining a sheet of metal around a straight axis is called 20) The extra portion which must be separated from the extrudate by cutting it just beyond the die exit is called 21) In sheet metal forming the area to volume ratio is considered to be mm. 22) In rolling, if the maximum dratt is 12 mm, & the coefficient of friction is 0.2, thus the minimum roll diameter is 23) The starting work piece in steel hot rolling of plate and sheet stock is called a 24) are 3 methods that can be used to control the

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1. The friction in direct extrusion is ________ Indirect extrusion. a) Greater than. b) Equal to. c) Less than.2. The Temperature in hot forming process is ____. a) (0 to 0.4) Tm. b) (0.5 to 0.75) Tm. c) 0.9 Tm. d) 0.4 Tm. e) 0.8 Tm. f) (0.3 to 0.5) Tm. Where Tm is the melting temperature of the work piece.3. Maximum draft in rolling depends on _______. a) Coefficient of friction and roll radius. b) Thickness of plate. c) Smoothness of roll Surface. d) Roll rotational speed.e) Width of the plate. f) Length of the plate.4. In deep drawing process, the drawing ratio (DR) has a higher limit (value) of:- a) 6. b) 1. c) 4. d) 5. e) 7. f) 2. g) Zero.5. Spring Back is a phenomena usually associated with which of the following processes:-a) Extrusion. b) Forging. c) Bending. d) Wire drawing. e) Rolling. f) Sheet metal cutting. g) Deep Drawing.
(USCS units) A turning operation is performed using a rake angle of 15°. Cutting speed = 200 ft/min, feed= 0.012 in/rev, and depth of cut = 0.100 in. The chip thickness ratio measured after the cut = 0.48. Determine (a) chip thickness after the cut, (b) shear angle, (c) friction angle, (d) coefficient of friction, and (e) shear strain (USCS units) The turning operation in the previous problem involves a work material whose shear strength = 52,000 lb/in2. Based on your answers to the previous problem, compute (a) shear force, (b) cutting force, (c) thrust force, and (d) friction force.
I am stuck on the process of finding the shear and being points.
In sheet metal parts, the minimum bending radius is dependent on which of the following elements? a. Thickness b. Type of a material c. State of material d. Thickness and type of material e. Type of process.
You have been asked to work on some design problems and technically support the team working on material removal processes: 1. Technician is turning (lathing) a work material with a shear strength of 270 MPa as shown in Figure 1. The following conditions are used: v = 5.0 m/s, f = 0.30 mm/rev, d = 3.0 mm, and rake angle = 15° in the direction of the chip flow. The resulting chip ratio = 0.5 , material removal rate = 4500 mm3/min ,shear plane angle = 29.02° and the shear strain is = 2.052. Chip Tool R. RF: Turning process.Using the orthogonal model as an approximation of turning, you have been asked to determine: (a) Shear force. (b) Cutting force and thrust force. (c) Friction angle.
In a slab rolling operation, the maximum thickness reduction (del hmax) is given by del hmax = μ²R, where R is the radius of the roll and u is the coefficient of friction between the roll and the sheet. If µ = 0.1, find the maximum angle subtended by the deformation zone at the centre of the roll.
A toy manufacturing uses 51030 rubber wheels per year for its popular dump truck series. The firm makes its own wheels, which it can can produce at a rate of 800 per day. The toy trucks are assembled uniformly ( at a constant rate ) over the entire year. Carrying cost is $ 1.50 per wheel per year. setup cost for the production run of the wheel is $ 47. The firm operatyes 243 days per year. Determine each of the following: 1-Optimal run size 2-Use your final answer from part 1 to determine minimum total annual cost for carrying and setup 3-Cycle time for the optimal run size 4-Run time
The maximum possible draft in rolling which is the difference between initial and final thickness of the sheet metal, depends on A. Rolling force B. Roll radius C. Roll width D. Yield shear stress of the material
In a factory where there are three shifts: The machine overhead cost is found to be £8.20 / hr, the labour overhead cost is found to be £30.20/hr, and the premises overhead cost is found to be £3.50/hr. Using the principle of overhead costing: If a single component takes 23 minutes to manufacture on the milling machine. What is the cost / part? You should include machine costs, labour costs and premises costs in your answer, but you can neglect material and energy costs. Express your answer in £ rounded up to the nearest penny.
a) Define specific energy for plane strain machining (cutting). b) In plane-strain orthogonal machining, the two main sources of energy dissipation are deformation along the shear plane (~70%) and friction at the tool-chip contact along the rake face (~30%). Consider plane-strain machining of a rigid perfectly-plastic work material whose uniaxial yield stress is 700 MPa, and is independent of strain rate and temperature. A tool of zero-degree rake angle is employed. Measurements showed the (deformed) chip thickness to be twice that of the undeformed chip thickness. Based on the aforementioned distribution of energy, estimate the specific energy for this process.
the work metal has a flow curve defined by K=300MPa and n=0.2, and the coefficient of friction between the rolls and the work is assumed to be 0.1. a 250mm wide strip 2.0cm thick is fed through a rolling mill with two powered rolls each of radius=300mm. the work thickness is to be reduced to 18mm in one pass at a roll speed of 50rev/min. what will be the power for this operation?
q1)Work-parts that have low area to- volume ratio are called. Select one: a. Bulk b. Billets c. Sheet metals d. Foils e. Plates q2)A 42.0-mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 325 mm and the rotational speed is 49.0 rev/min. Determine (a) the minimum required coefficient of friction that would make this rolling operation possible?