multipupose grass cutting machine
TRANSCRIPT
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IPE- 304Product Design-IΙ Sessional
Multipurpose Grass Cutting Machine
Presented By:Lab Group- 031. Jahangir Kabir Anik (1008002)2. Md. Sabbir Hossain(1008003)3. Jannatul Bushra (1008005)4. Sohel Rana (1008022)5. Imran Hasan Tusar (1008024)
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Contents
IntroductionCustomer SurveyQuality Function DeploymentBlack box & Functional DecompositionMaterial & Manufacturing Process SelectionStress-Strain AnalysisCost AnalysisConclusion
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Our Selected Product is
Multipurpose Grass Cutting Machine
Causes for selection:• A common daily
used equipment• No local
manufacturer• Encouraging
gardening
Introduction
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Customer Survey
Number of Persons Surveyed: 25
Survey location: Lawns of
residential areas & halls
Focus Group: Middle aged gardeners
One of the vital Survey
Questions was
Dis-satisfied Indifferent Satisfied Highly Satisfied0
10
20
30
40
50
60
70
80
Satisfaction Level
Perc
enta
ge o
f peo
ple 68 percent dis-
satisfied !!
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Yes
No
Not now
64%
Will you buy a manually operated grass cutter?
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Operating facility with pedal
Aerating facility
Adjustable cutter height
Brushing facilityNo fuel needed
Simultaneous operation
Two alternative driving
force
Unique Features
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Quality Function
Deployment
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QFD
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BLACK BOX METHOD
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Product presente
d as a function
al system
Energy
Mechanical energy
Information
Function
Smooth uniform cutting of grass
Information
1.Cutting speed(rpm)2.Running speed(m/s)
3.Safety Precaution
1. Grass of desired height after cutting
2. Aerated healthy green grass3. Collected grass in two
containers
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Component Hierarchy
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Multipurpose Grass Cutting
Machine
1. Adjustable sitting & pedaling unit
3. Brushing unitCollecting the grass
2.Cutting unit & Aerating unitGrass cutting & Aerating
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Cutting & Aerating Unit
CutterFrame & Container
Flat blade (1)
Spiral blade(6)
Blade holders(5)
Shaft(1)
Aerator
Shaft(1)
Fin(8)
Half Cylindrical portion
Handle Gripper
Long Handle
Nob (2)
Nut & Bolt (2 pair)
Sheet metal
Roller strard with multiple holes
Roller
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Design Analysis of Multiple Grass
Cutting Machine
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Some Important Components of Our Product
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Arrangement for Pedaling & Pushing Drive
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Material and Manufacturing
Process Selection (Weighted Average
Method)
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Purchasing MaterialHere are the materials we are going to purchase1. Nut-bolts2. Bearing3. Plastic Seat4. Wheel5. Chain6. Handle Gripper7. Sprockets
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Comparison of Mechanical Properties of Some Materials
Property Cast iron Mild steel Wrought iron
Density (kg/m^3) 7200 7858 7600
Shear Modulus (N/m^2) 5.00E+10 8E+10 2.5E+8
Coefficient of Thermal Expansion(/k)
1.21E-05 1.20E-5 1.22E-5
Elastic Modulus (N/m^2) 6.62E+10 2.05E+11 2E+8
Compressive Strength(N/m^2) 5.72E+8 4.077E+8 3.03E+8
Material Selection
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Goals Number of positive decisions, N=n(n-1)/2=6(6-1)/2=15 Positivedecisions
RelativeemphasisCoefficient,α
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Cost 1 0 1 0 0 2 0.13
Dimensionalaccuracy
0 0 1 1 0 2 0.13
Availability 1 1 1 0 1 4 0.27
Powerrequirement
0 0 0 1 0 1 0.07
SurfaceFinish
1 0 1 0 0 2 0.13
Metallurgicalchange
1 0 1 0 1 1 4 0.27
Total Number of Positive Decisions 15 ∑α =1.00
Determination of Relative Importance by Digital Logic Method
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Manufacturing Process Selection for Cutting Tubes and Rods
Goals WeightingFactor,α
Saw Cutting Gas cutting Laser cuttingScaledProperty, β
WeightedScore, αβ
ScaledProperty, β
WeightedScore, αβ
ScaledProperty, β
WeightedScore, αβ
Cost 0.13 100 13.00 80 10.40 60 7.80Dimensionalaccuracy
0.13 75 9.75 50 6.50 100 13.00
Availability 0.27 100 27.00 80 21.60 40 10.80Powerrequirement
0.07 100 7.00 80 5.60 60 4.20
SurfaceFinish
0.13 80 10.40 60 7.80 100 13.00
Metallurgicalchange
0.27 100 27.00 75 20.25 100 27.00
Material PerformanceIndex, γ
94.15 72.15 75.8
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GoalsWeightingFactor,α
Turning in Lathe Machine ExtrusionScaledProperty,β
WeightedScore, αβ
ScaledProperty,β
WeightedScore, αβ
Cost 0.27 80 21.60 100 27.00Dimensionalaccuracy
0.27 80 21.60 100 27.00
Forcerequirement
0.12 100 12.00 60 7.20
Powerrequirement
0.07 80 5.60 100 7.00
SurfaceFinish
0.07 80 5.60 100 7.00
Metallurgicalchange
0.20 80 16.00 100 20.00
Material PerformanceIndex, γ
82.40 95.20
Manufacturing Process for Shaft Cutter, Aerator , Brush & Wheel
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Stress-Strain Analysis
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25 Static Nodal Stress Distribution Spectrum
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26 Static Displacement (Strain) Distribution Spectrum
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Cost Analysis
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Units of Production per year: 750 Tk.
Total machine cost: 5,27,000 Tk.
Interest paid per year: 7,50,000 Tk. (13% interest ,10 years)
Total raw material cost per year : 21,15,000 Tk.
Total labor cost per year : 7,02,000 TK
Total purchasing cost : 60,37,500 TK
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• 81,52,500 Tk.Raw material Used in production per
year:
• 6,60,600 Tk.Total manufacturing
overhead per year:
• 95,14,500 Tk.Total manufacturing Cost per year:
• 3,09,400 Tk.Total administrative cost
per year:
• 60,000 Tk.Total marketing cost per year:
• 71,56,800 Tk.Total non-manufacturing
overhead per year:
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Total Fixed Cost =
84,08,000TK
Total Variable Cost =
106,14,500 TK
Variable Cost per Unit =
14150 Tk.
Selling Price Per
Unit = 30000 Tk.
At Break Even Point,• QBEQ = 531
Units
Break-Even Analysis
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0 100 200 300 400 500 600 700 800 9000
5000000
10000000
15000000
20000000
25000000
30000000
8408000 982300011238000
1265300014068000
15483000
16898000 1831300019728000
Fixed Cost Total Cost Linear (Total Cost) Total Revenue
Units Sold
Cos
t & R
even
ue
Break Even Quantity=531 units
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Conclusion
Main focus was the following customer requirements
•Adjustable cutter height•Grass collection facility•Aerating option•Lightweight•Cheap
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Any Query
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