4_injection_molding_instructions_-_week_1.20091012.4ad352c1c9c682.72110175

4_injection_molding_instructions_-_week_1.20091012.4ad352c1c9c682.72110175

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ME350 – Injection Molding Lab Instructions Week I 1.1.1 Objectives The objectives of this lab are to: (1) Introduce the Injection Molding process (2) Gain experience with both the MoldFlow simulation software (3) Gain experience with the Mini-Jector Injection Molding Machine (4) Analyze temperature, pressure, and material effects on the molding process 1.1.2 Lab Structure 1.1.3 Preparing Your STL Files 2 Creating the negative of your mold You must first create a ‘negative’ of your mold (i.e. what your plastic part would look like. Since your mold is actually the negative, you are technically creating the positive). This can be done by using your part model to “cut out” material from the CAD_CAM_Block.prt workpiece using Pro/Engineer. (1) Open Pro/Engineer . 1 Create 2 STL files: one with and one without a sprue- runner-gate system. (Week 1) Simulate example part cellphone.stl . (Week 1) Group member 1: Simulate your part with sprue-runner-gate system attached in Mold-Flow (Week 1) . Injection mold your designed part (Week 2) Simulate the spiral part for 3 different temperatures and 3 different pressures (Week 1) Injection mold the spiral part for 3 different temperatures and 3 different pressures (Week 2) Group member 2: Simulate your part without sprue-runner-gate system attached in Mold-Flow (Week 1) . Compare and consolidate your results (Week 1) .
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ME350 – Injection Molding Lab Instructions Week I (2) Download and save [yourpart].prt and CAD_CAM_Block.prt to a directory, and set that directory as your working directory. (3) Create a new assembly from the File -> New… menu. (4) Insert your part into the assembly through Insert -> Component -> Assemble… (5) Select “ Default ” as the automatic constraint type and click the green check mark. (6) Repeat Steps 3 and 4 to insert the CAD_CAM_Block workpiece into the assembly. You should now have your part completely inside of the blank workpiece. (7) Go to Edit -> Component Operations and choose the Cut Out option. (8) You will now be asked to “Select parts to perform CUT OUT process”. Select the CAD_CAM_Block.PRT in the left-hand navigation tree. (9) Click OK or press the middle mouse button to confirm your selection. (10)You will now be asked to “Select reference parts to perform CUT OUT process”. Select [yourpart].prt in the left-hand navigation tree. (11)Confirm your selection and click Done in the Menu Manager. You have now used your mold to “cut out” material from the blank_al workpiece. The only material that is left is the empty cavity of your mold. (12)Right-click on [yourpart].prt and select Delete. You should now see the “negative” of your mold, as shown in the figure below: (13) File-> Save to save your assembly (.asm). 2 Figure 1: Original mold (left) and final part (right)
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ME350 – Injection Molding Lab Instructions Week I 3 Creating .stl without sprue-runner-gate Figure 2: STL without Sprue-Runner-Gate attached (1) File -> Save a copy… (2) Select STL(*.stl) from the drop-down menu and give it a new name (e.g.
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