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Materials

In: Science

Submitted By ellierowell
Words 833
Pages 4
PDES1155 –Materials Technology | Process Selection Assignment | Garden Spade |

mn13er
8/3/2012
|

Sketches of Components and Statement of Materials
Component 1 – Handle

From the Materials Selection Assignment, I identified that the mpst suitable material for the Handle to be made from would be PVC due to it having a relatively high young’s modulus, a very low price and it being lightweight.

Component 2 – Shaft

For the shaft, the most suitable material identified for it to be made from would be Oak due to its price, and leightweight characteristics as well as it having a relatively high young’s modulus.

CES Edupack identified silicon carbide to be the most suitable material for the blade to be made from due to it having wear and corrosion resistant parts, as well as a high young’s modulus.

Estimates of Component Dimensions In the materials selection assignment, I conducted some research into the average measurements of spade components. From this I got an idea of some measurements I could use for my spade.You need to state your assumptions and show your working where you have calculated these.

Component 1- Handle The average dimensions of a garden spade handle is 20cmx12cmx6cm (HxWxD)
Component 2 – Shaft The average length of a garden spade shaft is 690mm

Typically shafts are oval or circular hollow sections and a typical diameter value would be 29mm reflecting the interaction of the hand gripping the shaft and the relevant anthropometric data. Where the length is dependent on the blade lengths, for an average paddle the length would typically be 130cm. For the purpose of this assignment I have chosen to focus on a circular cross sectional (hollow) shaft with a wall thickness of 1.2mm. With the parameters with the average density 2700 kg m3 gives a typical weight of Volume = ( π(292 – 26.62)/4 ) x 1300 = 136,245 mm3 which is 0.000136 m3 Mass = 0.000136x2700 = 0.3672 kg Blade Typically a blade is 500mm in length and 150mm wide at the tip curving in both planes as indicated by the sketches above. The socket for the shaft is approximately 30mm as a tolerance is required for the joining/bonding of the components. However the blade thickness tapers towards the tip to approximately 5mm from 10mm. The fit of the blades on the shaft has been allowed a clearance as too tight a fit will affect the joining of the components. An estimation of the volume of the paddle blade is as follows; 0.000545m3 Average density of the material is 2780 kgm3 So the estimated mass is 1.5 kg Grip The grip material in sheet format is 150mm by 90mm, this allows a 20mm overlap for the joining method onto itself. It is 7mm thick to allow a suitable depth of compression for the comfort of the user. There will be two for each paddle. An estimation of the volume of one grip is: 0.0000945m3 Average density of material is 935 kgm3 Estimated mass = 0.0884 kg
Specification of Process Selection Parameters at the Component Level
These are best finally presented in a table – one example of which is included in this pro forma but other examples are shown in the worked example. Where these are calculated (e.g. component mass from volume and density) you should show your working.

Component 1

Parameter | Value Range | Stage | Notes | Material | | | | Shape | | | | Continuous | | | | Mass Range | | | | etc… | | | |

Component 2

Parameter | Value Range | Stage | Notes | Material | | | | Shape | | | | Continuous | | | | Mass Range | | | | etc… | | | |

Component 3

Parameter | Value Range | Stage | Notes | Material | | | | Shape | | | | Continuous | | | | Mass Range | | | | etc… | | | |

Selecting the Optimum Processing Route using CES EduPack
Note that the parameters used and the type of selection stage employed for screening should be given in the previous section but you should include copies of any selection charts, which clearly show the selection window. You should consider the full production route for each component which may include multiple stages (primary, secondary, tertiary).
You may use either the cost model equation or the tool in CESEduPack to estimate the (relative) costs of production but you do not need to include both (both are shown in the worked solution so as to illustrate both methods). You should tabulate the parameters which you employed for the cost modelling here.
Component 1
Screening
Cost Modelling
Component 2
Screening
Cost Modelling
Component 3
Screening
Cost Modelling
Joining Components into Assembly
Note that this section is not required if you have chosen the Picnic Set or the Archery Bow and Arrow but it may be necessary to consider joining as part of the production route for one or more components.

Joining Process Selection Parameters
Screening
Life Cycle Issues
Component 1
Component 2
Component 3
Discussion
Limitations of the Process Selection Method
Validity of the Processes Selected
Comparison with Processes Currently Used for Component 1
Comparison with Processes Currently Used for Component 2
Comparison with Processes Currently Used for Component 3
Conclusions
References

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