ME5240 Final Project

CPU heat sink

Wei Wei

Design & 3D modeling

1. Parts Steps

Fan

1. Create block by using extruded

2. Make a cut and use circle pattern

3. Make a mirror on the other side

4. Create the fillet on the four corner

5. Extruded the block shown below

6. Make another extruded and use circle pattern

7. Create a cylinder and fillet

8. create four holes on corner

9. extruded cut as blow

10. Create the loft by sketch two surfaces feature shown

below and circle the pattern

11. Make the base by using extruded and cut

Heatsink

1. Use extruded

2. Create the cut

3. Create the cut and pattern

Screw

1. Create the Revolve

2. Create the loft-cut by using two sketch and circle

pattern

Bracket

A. Bracket 1

1. Sketch and use base flange to make the sheet metal

2. Make the two cut and fillet

3. Extruded the cut

4. Cut a hole on the right side and a extruded cut on the

bottom

5. Create a cut on the top

6. Bend the flange by using edge-flange

Same with the other side

7. Fillet

B. Bracket 2

1. Same as bracket1

2. Make the cut

3. Two side Edgebend

4. Extruded two cut and fillet the edge

5. make the cut on the right plane

2. Design Binder

(See assembly design binder file)

In electronic systems, a heat sink is a passive heat exchanger component that cools a

device by dissipating heat into the surrounding air. In computers, heat sinks are used to

cool central processing units or graphics processors. Heat sinks are used with high-power

semiconductor devices such as power transistors and optoelectronic devices such as

lasers and light emitting diodes (LEDs), wherever the heat dissipation ability of the basic

device package is insufficient to control its temperature.

A heat sink is designed to increase the surface area in contact with the cooling medium

surrounding it, such as the air. Approach air velocity, choice of material, fin (or other

protrusion) design and surface treatment are some of the factors which affect the

thermal performance of a heat sink. Heat sink attachment methods and thermal

interface materials also affect the eventual die temperature of the integrated

circuit. Thermal adhesive or thermal grease fills the air gap between the heat sink and

device to improve its thermal performance.

3. Assembly Step

a. bracket 1. Insert the bracket 1 and bracket 2 assembly

b. Heatsink and Fan

1. Insert heatsink

2. Insert the fan

3. Insert the four screws

4. Insert the two brackets

5. Mate as shown below

4. Drawing

Design verification & analysis

1. Design verification

Number Name

1 Bracket 1

2 Bracket 2

3 Fan

4 Heat sink

5 Screw

1.

2.

3.

4.

5.

2. Mass Properties

5. Visualization

Hidden line removed

Shaded with edge

colors

Decal

Texture

6. Configuration analysis

Defaul

t

2

3

7. Surface analysis

Surface curvature

Curvature combs

8. Part manufacturing

For the screw

9. Sustainable design

The manufacturing region is Asia, and use region is North America.

When the material is aluminum alloys

When the material is steel

It show the steel will be better choice for this model and environment, but it will cost more water.

Questions

1. Discuss your 3D curves and surfaces. Did you find it hard to create them? Did you find it hard to

control the 3D curves and surfaces? Which one? Why?

Yes. When I create the fan surface, I sketch two curve and I find it hard to create the 3d sketch which will be used as

the guide curve.

2. Elaborate the volume calculations? Do they make sense, e.g. location of centroid, moments of

inertia, etc.? Use your statics background to explain

For the screw, it is symmetrical, the centroid of y and z axis will be 0. From the result we know it make sence.

Density = 0.008 grams per cubic millimeter

Mass = 1.242 grams

Volume = 159.239 cubic millimeters

Surface area = 236.708 square millimeters

Center of mass: ( millimeters )

X = 7.803

Y = 0.000

Z = 0.000

Principal axes of inertia and principal moments of inertia: ( grams * square millimeters )

Taken at the center of mass.

Ix = (1.000, 0.000, 0.000) Px = 2.365

Iy = (0.000, 0.000, -1.000) Py = 40.652

Iz = (0.000, 1.000, 0.000) Pz = 40.652

Moments of inertia: ( grams * square millimeters )

Taken at the center of mass and aligned with the output coordinate system.

Lxx = 2.365 Lxy = 0.000 Lxz = 0.000

Lyx = 0.000 Lyy = 40.652 Lyz = 0.000

Lzx = 0.000 Lzy = 0.000 Lzz = 40.652

Moments of inertia: ( grams * square millimeters )

Taken at the output coordinate system.

Ixx = 2.365 Ixy = 0.000 Ixz = 0.000

Iyx = 0.000 Iyy = 116.280 Iyz = 0.000

Izx = 0.000 Izy = 0.000 Izz = 116.280

3. Elaborate on the creation of the injection mold. Does the mold make sense?

For the screw part, injection is the best way to manufacture. Because this part is much easier to use

injection way to manufacturing and cheaper.

4. Elaborate on the sustainable design of the part. Do your calculations make sense?

I chose the manufacturing region is Asia, and use region is North America, so the result show it is

much better than the situation which the manufacturing region is North America, and use region is North

America. That make sense, because the Labor cost in America is much higher than Asia.

5. What did you learn from the project, how much time did you spend on it? Do you have any

suggestions to make the project experience better? Discuss.

How to create a complex surface and sustainable design. Almost 10 hours.

6. Course exit feedback; write your candid feedback about the course. Any suggestions to improve?

It is great, just too early to get the class.