Mvs 311 Unit 3 Research Paper
Copyright reserved | Department of Mechanical Engineering | Semester Test 2 - 2011 | | Manufacturing Systems MVS 311 | Date - 15 April 2011 | Duration – 90 minutes This is an open book examinationInternal examiner: Mr E.T. BrettExternal examiner: Mr. J.J. Pienaar | * Answer ALL THE questions. * State and motivate all assumptions clearly. * Please Note: All questions do not carry the same marks. * This paper consists of 2 pages | |
Question One a Establish the initial total length of a 12 mm round material slug required to manufacture a bolt by upset forging the bolt head and by impact extruding the shank portion where the thread is required. The bolt has the following dimensions (12 mm shank diameter, 20 mm unthreaded portion of shank, 30 mm length of threaded portion on the shank, m12 x 1.75 thread with a bolt shank pitch diameter of 10.75 mm, 19 mm bolt head width across flats, 8 mm bolt head thickness). …show more content…
b The first station of a wire drawing process is utilised to reduce the area of a 8 mm rod by 25%.
at each station i. Calculate the new diameter of the rod after the first station. ii. Calculate the diameter of the “wire” after it has passed through four stations. iii. Establish the percentage increase in length of the wire after the wire has passed through the four stations.
Question Two
a Describe how the electroplating process applicable to “plastics” functions. b Under what circumstances would the following finishing processes be used: i. Cladding, ii. Burnishing iii. A iv. B
Question Three
Describe what the following mean to you (provide sketches to clarify your answer) a Metal removal rate (state as well the appropriate ISO units that will be used to measure the metal
removal) b It is more economical to take a cut with a small feed than a small cut with a large feed. c A surface planer as well as a shaper consume excess energy due to the reciprocating action on which they operate. d It is generally safer to select the down to the up cut milling ….. e Milling flat surfaces with a ……… milling cutter is very economical. f
Question Four g Describe the factors you would take into account when choosing a manufacturing process for the following products: a A stud having threads on both sides. b A connecting rod for a 1200cc motor car engine.
Take only two distinct processes into consideration.
Question Five
Economical processing/machining
Question Six
a You are required to manufacture a single unit of the component shown below from mild steel. The material is 50 mm long and its diameter is 20 mm. State what lathe and what lathe accessories you would use as well as how you would adjust the lathe. Assume any other values that you consider to be of importance.
Question One a Establish the initial total length of a 12 mm round material slug required to manufacture a bolt by upset forging the bolt head and by impact extruding the shank portion where the thread is required. The bolt has the following dimensions (12 mm shank diameter, 20 mm unthreaded portion of shank, 30 mm length of threaded portion on the shank, m12 x 1.75 thread with a bolt shank pitch diameter of 10.75 mm, 19 mm bolt head width across flats, 8 mm bolt head thickness). …show more content…
b The first station of a wire drawing process is utilised to reduce the area of a 8 mm rod by 25%.
at each station i. Calculate the new diameter of the rod after the first station. ii. Calculate the diameter of the “wire” after it has passed through four stations. iii. Establish the percentage increase in length of the wire after the wire has passed through the four stations.
Question Two
a Describe how the electroplating process applicable to “plastics” functions. b Under what circumstances would the following finishing processes be used: i. Cladding, ii. Burnishing iii. A iv. B
Question Three
Describe what the following mean to you (provide sketches to clarify your answer) a Metal removal rate (state as well the appropriate ISO units that will be used to measure the metal
removal) b It is more economical to take a cut with a small feed than a small cut with a large feed. c A surface planer as well as a shaper consume excess energy due to the reciprocating action on which they operate. d It is generally safer to select the down to the up cut milling ….. e Milling flat surfaces with a ……… milling cutter is very economical. f
Question Four g Describe the factors you would take into account when choosing a manufacturing process for the following products: a A stud having threads on both sides. b A connecting rod for a 1200cc motor car engine.
Take only two distinct processes into consideration.
Question Five
Economical processing/machining
Question Six
a You are required to manufacture a single unit of the component shown below from mild steel. The material is 50 mm long and its diameter is 20 mm. State what lathe and what lathe accessories you would use as well as how you would adjust the lathe. Assume any other values that you consider to be of importance.