senior design project
TRANSCRIPT
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American Leather Upholstery/Final Assembly Workstation Redesign
Shrijan ShresthaUkesh Chawal
Indra Poudel
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Founder/CEO Bob Duncan American Leather was founded in 1990 Revolutionary idea: “ Custom leather furniture
could be made and shipped in three weeks or less.”
“just-in-time” Manufacturing From a small four person shop, the company
has grown into a thriving leader in the furniture industry, with over 130 different collections sold in over 650 stores
The factory, based just outside of Dallas, Texas
Introduction
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Redesign comfort sleeper upholstery/final assembly workstation to make employee more efficient.
Increase productivity by 10% Factors to consider:
◦ material flow◦ material handling◦ work station location in relation to steps in
upholstery process.
Objective
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Value Stream Map
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Manufactures Comfort Sleeper Comfort Sleeper
◦ Couch with sleep system◦ Can be converted into bed
Work Stations Involved:◦ Sewing Upholstery◦ Sub-Assembly Assembly◦ Deluxing Packaging
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Bed Type Version Bed Size Bed Height
Foam V3 KH LL
Plush/Premier V5 KS HL
Gel Sleeper QP
Temperpudic V6 QS
FS
TS
CS
Type Of Beds
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Focal Point
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Upholstery 24 Workstations
One worker per station
worker uses the upholstery table to put the leather and fabric into the frame and then staple it together
Cycle Time: 40 minutes per order
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Sub-Assembly 2 Sub Assembly Station
2 workers per station
Sub assembler puts the frames and mattress together to make a bed
Cycle Time: 11.72 minutes
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Final Assembly 6 Final Assembly
One Assembler per Station
Assembler assembles Frames from upholstery and Bed from sub assembly station
Cycle Time: 19.2 minutes
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Process Flow
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Flow ChartUpholstery
Assembler
WIP on conveyor belt
Sub-Assembly
Bed In Transfer Cart
Final Assembly
Is bed Available
Order for bed
Yes
NO
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Walking Time and Distance
Lack of Sequencing
High WIP
Problems
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Walking Time and Distance
41 trips/ day (Sub-Assembler)
Time traveled by sub – assembler = 1.03 min / trip (42.23 min/day)
Distance traveled = 68.4m/trip (2804.4 m/day)
25 trips/day (Assembler)
Time traveled by Assembler = 1.10 min/ trip (27.50 min/day)
Distance Traveled = 58.8m/trip
(1470 m/day)
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Lack Of Sequencing Lack of Systematic
Ordering
Frames were completed and are placed in the conveyer belt but the beds were missing causing assembler to work on next WIP on conveyer belt
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High WIP
There were a lot of WIP in the moving cart
Total space covered by WIP is 2786.62 square ft.
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Barcode System of Ordering using MS Excel
Replacement of the upholstery table with modified transfer carts
Proposed Solution
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Barcode System
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Barcode System DesignedVersion Bed Type Bed Size Bed Height Barcode
V6 Temp KS LL
V6 Gel TS HL
V3 Foam QS
Sleeper Foam FS
V5 Plush CS
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How It Works
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Upholstery Table VS Cart
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Modification on Carts Wheel Lock
• Replacement of the regular wheels with lock wheels
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Before and After
Before After• Time saved• Space of WIP saved• More Sequenced
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For Sub Assembler, Total # of bed assembled = 41 beds per day Total time saved = 41 * 1.03 = 42.23 min per day Total time required for assembling the beds= 480 – 42.23 = 437.77
min = 7.29 hrs. (instead of regular 8 hrs.)
Similarly for Final Assembler, Total time required for assembling the beds = 480 – 27.5 = 452.5 min
= 7.54 hrs. (instead of regular 8 hrs.)
Data Analysis After Solution
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For Sub-Assembler, ( Wage/ hr. = $11)
Total expenditure for four employees in 8 hrs. = 4 * 8 * $11 = $352 per shift Total expenditure for four employees in 7.29 hrs. = 4 * 7.29 * $11 = $320.76 per shift Total amount saved = $352 - $320.76 = $31.24 per shift
= $62.48 per day = $1374.56 per month = $16,494.72 per year
Similarly for Assembler, ( Wage/ hr. = $11)
Total amount saved = $528 - $497.64 = $30.36 per shift = $60.72 per day = $1335.84 per month = $16,030.08 per year
Total saving per year = $32,524.8
Cost Analysis
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Cost of one wheel lock = $42 Total cost of wheel lock for 24 upholstery = $4,032 Total cost of the flat screen monitor = 2 * $500 = $1000 Total cost = $5,032
Calculated savings per year = $32,524.8 Total amount saved per month = $2,710 Payback Period = 2 months.
Pay Back Period
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For Sub-Assembly, After the solution, In 7.29 hrs. was needed to assemble 164 beds
Before the solution, In 7.29 hrs. total number of beds assembled = 7.29*164/8 = 150 beds
Therefore, extra number of beds = 164 – 150 = 14 beds Hence, Productivity = 14/150*100=9.33%
Similarly For Assembler,
Productivity = 9/141*100= 6.4%
Productivity
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People• COO of American Leather • Manager• Employee
Final Assembler Sub Assembler Upholstery employee Material handler
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Materials• Measuring Tape• Stop Watch• Laser tape
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Information• Problem Solving Tools• Cad layout• Distance Travelled• Cycle Time• Production Rate
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Equipment• Fork Lift• Moving Cart• Tools (Screw, Hammer, Hydraulic Tightening, Nuts) • Computers• Flat Screen Television
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Energy
• Electricity
• Hydraulic
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Realistic Constraints ECONOMIC• Amount saved = $32,524.8 per year • Save Expenditure
ENVIRONMENTAL• Trash can recommended • Spare parts Handling
SOCIAL• Role of workers and the managers
POLITICAL• Convenient management
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ETHICAL• As an engineer, we are expected to exhibit the highest standards of honesty and integrity.
Engineers must perform under a standard of professional behavior that requires adherence to the highest principles of ethical conduct.
• Contract with American Leather.
HEALTH AND SAFETY• Health factors were considered
MANUFACTURABILITY• Engineers helps to manufacture more products.• Increase in productivity
SUSTAINABILITY• Will help American Leather to compete with others in future
Realistic Constraints
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Course Title Knowledge and skills acquired that were used in this projectIE 1105 Introduction to Industrial Engineering Lab
PowerPoint presentation and deliver an oral report.
IE 2305 Computer Applications in Industrial Engineering Lab
Programming in Excel and prepare the bar code.
IE 3301
IE 3314
Engineering ProbabilityEngineering Research Methods
EXCEL for performing descriptive statistics
IE 3312 Economics for Engineers
Payback period, Financial summary.
IE 3315 Operations Research I
Networking Problems, Shortest Path
IE 3343 Metrics and Measurement
Time study , Work Design
IE 4303 Production and Inventory Control
Work In Progress (WIP), Productivity, Cycle time (CT), Just in time (JIT)
IE 4308 Statistical Quality Control
Process diagnosis, capability and improvement of the system.
IE 4343 Facilities Planning and Design
Analyze flow, space, and activity relationships with impact to material handling and design layout alternatives
IE 4344 Human Factors Engineering
Measure and understand human capacities for work, table design and physical movements
IE 4350 Industrial Engineering Capstone Design
Design Project , Professional ethical responsibility and contemporary issues
IE KNOWLEDGE AND SKILLS
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Initial investment was $5,032 and the payback period is 2 months.
Total area saved is 2786.62 square ft. The total amount of money saved is $32,524.8
per year Total time saved by a worker is 42.23 min per day
in the sub – assembly section while in the final assembly section is 27.5 min per day.
Conclusion and Summary
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UTA faculty members
American Leather
Mentor and Instructor Dr. K.J Rogers
Acknowledgement
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