hw2-problem
pdf
keyboard_arrow_up
School
University of Michigan *
*We aren’t endorsed by this school
Course
533
Subject
English
Date
Apr 3, 2024
Type
Pages
6
Uploaded by KidCrow3386
© 2024 Kazuhiro Saitou, all rights reserved. ME452/ISD528: (Advanced) Design for Manufacturability Winter 2024 HW#2 (92 points) You must include the signed Honor Code affidavit as shown below in the homework submission. Problem 1 (Graded and recorded automatically by Canvas) Do the N
min
Quiz at Quizzes
Nmin Quiz in the course Canvas site. There are 8 multiple-choice quizzes, which are worth 18 pts in total. You can retake the quiz as many times as you want until the due, and the highest scores will be recorded. So repeat until you get the full 18 pts! Solution: You will know when you submit the completed quizzes. I have neither given nor received aid on this assignment, nor have I concealed any violations of the UM College of Engineering Honor Code. Name: ____________________ UMID: ___________ Signature: __________________ Date _______
© 2024 Kazuhiro Saitou, all rights reserved. Problem 2 (40 pts)
Consider the shaft assembly shown above, whose assembly procedure is as follows: 1.
The retainer bush is placed in the work fixture like the one shown below. 2.
The shaft is inserted in the bush. 3.
The securing screw is inserted into the bush and is difficult to align and position. 4.
The spring tangles severely and, when separated from others, is dropped onto the shaft. 5.
The washer is inserted onto the shaft and then held down while the snap fastener is positioned using a standard grasping tool. (a)
Estimate the manual assembly time and design efficiency of the assembly by filling the DFA worksheet as shown below. The descriptions on how the worksheet was filled are not required but would help if the filled numbers were incorrect. (15 pts) Item # Name # of Items 2-digit manual handling code Manual handling time per part (sec) 2-digit manual insertion code Manal insertion time per part (sec) Total assembly time Theoretical min # of parts
© 2024 Kazuhiro Saitou, all rights reserved. 1 2 … Total (b)
Suggest a redesign of this assembly to reduce the number of parts and increase the assembly efficiency. Draw the “after” sketch of the parts in an exploded view like the figure above. Use callouts to indicate modified features (including part consolidation) after the redesign, and identify the design guidelines that suggested them. (10 pts) (c)
Estimate the manual assembly time and design efficiency of the redesigned assembly by filling the DFA worksheet as shown in (a). The descriptions on how the worksheet was filled are not required but would help if the filled numbers were incorrect. (15 pts)
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
© 2024 Kazuhiro Saitou, all rights reserved. Problem 3 (12 pts) For each of the six different small parts shown below, determine the 5-digit codes for estimating relative handling cost and orienting efficiency for automated assembly. All dimensions are in mm. (2 pts each) (a) (b) (c) (d) (e) (f)
© 2024 Kazuhiro Saitou, all rights reserved. Problem 4 (40pts) Above figure shows a small three-part assembly that is to be assembled automatically. The assembly begins by insertion of base in to an assembly fixture and ends with insertion of screw. The assemblies are required at a rate of 10 per minute. (a)
Estimate the automated assembly cost of the assembly by filling the DFA worksheet as shown below. The descriptions on how the worksheet was filled are not required but would help if the filled numbers were incorrect. (15pts) Item # Name # of Items 5-digit automatic handling code Orienting efficiency Relative handling cost Max feed rate handling (feeding) cost 2-digit automatic insertion code Relative work head cost Insertion cost Total assembly cost Theoretical min # of parts 1 2 … Total (b)
Suggest a redesign of this assembly to reduce the number of parts and assembly cost. Draw the “after” sketch of the parts in an exploded view like the figure above. Use callouts to indicate modified features
© 2024 Kazuhiro Saitou, all rights reserved. (including part consolidation) after the redesign, and identify the design guidelines that suggested them. Your redesign should make the plate easy to feed and insert automatically. (10 pts) (c)
Estimate the automated assembly cost of the redesigned assembly by filling the DFA worksheet as shown in (a). The descriptions on how the worksheet was filled are not required but would help if the filled numbers were incorrect. (15pts)
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help