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Engineering Model Design (Lab Report Sample)


Task:Develop a model design,mould design and machine simulation optimisation The paper gives an illustration of a moulding model design giving all the key areas of the design and how it can be optimized .

This coursework has been set up to carry out three main tasks which are: Model Design, Mould Design and Machining Simulation optimisation. These will ultimately help in understanding of machining constraints and economics in the development of product designs for manufactures. It will enhance the knowledge already gained in the use of CNC and CADCAM applications like pro engineer Wildfire
In the next view, a sketch plane is selected, upon clicking the sketch button, a rectangle can be drawn as shown, in figure 2.This is then extruded using the extrusion button from the toolbar; the desired dimensions like the thickness are entered. Other extrusions were carried out to get the desired shape and dimensions as shown in figure 4. Ribs were added to improve model resistance to deformation. Shelling was done to the bottom part of the model, and the result is shown in figure 5
Go to Application drop down menu, select Plastic Advisor. When asked to select point, click OK, figure 12 is gotten.
First step taken in this window, choose the plastic injection locations button, an appropriate level is chosen on the model as shown in figure 13.
The modelling tools button  is not selected.
Second step, select the pre-analysis check button; a pop up window gives information that there are no errors.
Third step selects the study wizard button. A new window appears as in fig 14.
The first section to choose here is the Gate Locator, Double click Next and Finish. Allow time for Plastic Advisor to carry out Analysis. In the Result Summary Window, Click CLOSE. Figure 15 is arrived at. As the colour bar shows, red is the worst location for the gate and blue is the perfect location for the gate. This image shows there is a need to change the gate location.
The analysis suggests the best place (geometrically) to make injection site given the material selected and existing injection locations.
Check Plastic Filling, Select Next twice and Finish. The result window is shown as in fig 19. Click Close.
The Confidence of Fill result displays the possibility of plastic filling anarea within the gap under conventional injection moulding conditions. This result is derived from the pressure and temperature results.
The Confidence of Fill result does not always predict a brief shot (the cavity does not fill), but still states that a good quality piece cannot be moulded. This is because the conditions at the end of the filling form are not suitable for the area to be adequately packed during the packing phase. The Filling Analysis gives information that the part can be easily filled, but the part quality may not be sufficient, all in Green in Figure 20 shows good results
Cooling Quality
This is the extra time after the end of packing ittakes 90% of sectiondepth to extend its freeze temperature and become solid. Where there is red pigment, the temperature is fairly different from the average, and the time to freeze is much lower than the average. Where there is yellow tint, the temperature is quite different from the average.
The green colour shows good cooling quality.
Sink markEstimate
Sink marks due to shrinkage of the material at deep sections without sufficient compensation. They are caused primarily by thermal shrinkage during cooling. After the exterior material has cooled and solidified, the core material starts to cool. Its shrinkage pulls the surface of the main wall inward, causing a sink mark. They do not affect part strength or function, they are perceived to be excessive quality defects.
The areas of the model liable to sink marks have been improved from about 3 per cent to less than 1%. The final sink spot diagram is shown in figure 27. The blue part has the lowest depression while the red shows the highest depressions and ranging from 0mm to 0.029 mm respectively. For the model, considering the sink marks are usually situated on the part number and logo, quality should be sufficient.
Preparation for mould design
A new subdirectory was created, and named Mould Cavity inside the MCAEPM Semester 2 Popov’. The current model design was copied from the Main folder inside the new subfolder. ProEngineer is opened; working directory is set to the Mould Cavity, Select File Drop down Menu, then New. In the New window, Select Manufacturing, then Mould Cavity as shown in Figure 29. Name it mould.
In the New File Options window, Empty is selected, then OK. There is aclearpro engineer window while the history tree contains MOLD.ASM.
On the Menu Manager on the top right, Mould Model is selected, then Assemble, then Ref Model as in Figure 30. In the next window, the Design model is selected, ashtray. prt.16.
In the next window, ProEngineer suggests to Create Reference Model, MOLD_REF. Click OK.
This is shown in figure 31.
Creating the Work Piece
In the Mould Model window similar to figure 30, select Create – Work Piece – Manual. In the Component Create window, Part and Solid are unchanged, and Block is given as Name shown in Figure 32.
In Creation Options window, Create features is selected, click OK. In the FEAT OPER window, Solid – Protrusion – Extrude – Solid and done are selected respectively.
Select Placement in the dashboard, then Define. A rough plane was selected; this did not go through the middle of the Reference Model but at its bottom. A reference plane was selected perpendicular to the previous selected plane.
A References window is shown the axis is selected. Arectangle, which is approximately three times bigger in dimensions than the Reference design is drawn using the Crate rectangular icon. The blue tick icon is selected and in the next window, select Extrude on both Sides icon,, and anintensity value 430mm which...
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