Report on Fan

Dimension of components

Bottom covering of fan Black elastomeric plastic Long hollow tube

Thickness(mm) 34 6.5 3

Width(mm) 50.5 11 25

Length(mm) 110 23.5 100

Name: Hollow tube

Position: This part is between the fan motor and clip.

Attributes:

-Dimension (mm)

Thickness 3

Width 25

Length 100

-Suggested Material: Amorphous thermoplastic (Polypropylene)

- Shape: Hollow tube shape

Suggested manufacturing process:

Hollow tube is green in color. It has hollow tube shape. It can bend in all direction. The hollow tube made of thermoplastic material (Polypropylene). Compare with other material (ABS, PMMA etc).This material is can withstand millions of flexing cycle. It ease of fabrication and suitable for extrusion blow moulding. The primary process - extrusion blow moulding is needed to make hollow tube.

Extrusion blow moulding has 4 processes. The machine consists of two halves of mould and extruder. In extrusion blow molding (EBM), the molten polymer is led through a right angle and through a die to emerge as a hollow tube called a parison. The parison is then captured by closing it into a cooled metal mold. Air is blown into the parison to inflate it to the shape of hollow tube mould. The plastic is allowed to be cooled sufficiently within the cooling period.

Then the mould is opened and the final part is ejected. In addition, in continuous extrusion blow molding, the parison is allowed to be extruded continuously and a suitable knife is used to cut it into individual parts.

As one end is enclose. Therefore, the secondary process is needed to cut the long hollow tube in small piece.

Compare with injection moulding. We choose extrusion blow moulding as primary process because tooling cost is lower than injection moulding. Reduce the tooling cost can reduce the unit cost of product. Also it is suitable for the simplex shape product. As the company produce only 20000 pieces. Extrusion blow moulding is more economy than injection moulding.

Reason for choosing:

• Low investment cost

• Economical production batch (0.5k-2M):Target =20000 pieces

• High