As the processing power and integration of CPUs continue to improve, their power consumption and heat generation have also increased significantly. This makes CPU coolers, such as the widely used air-cooled heatsinks, more important than ever. This 3D CAD design tutorial will focus on how to quickly create a 3D model of a CPU cooler using the "multi-object file" feature in Zhongwang 3D, making it easier to manage 3D CAD model files.
The working principle of an air-cooled heatsink involves the CPU cooler directly contacting the CPU's surface, transferring heat via conduction. A fan generates airflow to dissipate the heat from the cooler’s surface through convection, while the air inside the computer case carries away additional heat. High-temperature components also radiate heat to lower-temperature areas. The heatsink consists of three main parts: the fan, base plate, and cooling fins. This section will guide you through creating a fan model.
1. Begin by creating a new multi-object file named "CPU Cooler". Within this file, create a new object named "Fan". Use the "cylinder" shape to construct the fan's body. Specific parameters can be referenced in Figure 1.
2. Utilize the "offset" tool in the surface editor to define the boundary of the fan blades. Parameters are illustrated in Figure 2, resulting in the boundary curve shown in Figure 3.
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3. To facilitate future construction, create a "datum plane" as a reference. Details are shown in Figure 4. Next, create a sketch of two curves. Two methods for accessing the sketch mode are described below.
Method 1: Right-click the "XY" in the management window to access the "Manager". Use this method to establish the reference datum. Then draw a curve following the parameters in Figure 6. Draw a circular arc freely, and use Zhongwang 3D’s "auto-constraint" feature to adjust parameters accordingly. Exit the sketch mode after completion.
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Method 2: Right-click the previously created datum plane to enter the sketch mode. Follow the steps in Method 1 to establish the first arc. Specific parameters are detailed in Figure 8.
With both methods explained, let’s proceed with drawing the curves.
4. Using the "project curve" function in the wireframe, we can achieve the desired curve. Two arc projection parameters are shown in Figures 9 and 10, resulting in the curve seen in Figure 11.
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5. Since the projected curve is fragmented, they need to be connected. Here, we use the "curve list" function in the wireframe to create two lists as shown in Figure 12. These lists help form the blade surface. Use the "straight line" tool in the surface editor, following the instructions in Figure 13. Simply creating a surface isn’t sufficient; we must extend it to form a fan blade. Use the "extrude" function in the shape editor, as shown in Figure 14.
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6. The first fan blade is now complete. Next, we’ll create additional blades using Zhongwang 3D’s intelligent "array" function. This time, use the "circular array" feature, as illustrated in Figure 15. To proceed, hide unnecessary elements using the entity filter tool, as shown in Figure 16. Merge the features into a single entity using the Boolean operation, known as "combine" in Zhongwang 3D, as shown in Figure 17.
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7. After the initial modeling, the blades may appear sharp and require rounding. Zhongwang 3D’s playback feature makes modifications straightforward. First, locate the relevant records in the manager—start with the first blade extrusion record (Figure 19). Add fillets to selected areas, as shown in Figure 20. Afterward, click Play to move to the next step (Figure 21). Zhongwang 3D will automatically compute subsequent operations. Use the parameters in Figures 23 and 24 to apply the fillet function to the main body.
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8. Click "Insert Sketch" and select XZ as the datum plane, ensuring the correct orientation. Draw a sketch based on the parameters in Figure 26. Use the "Rotate" function to subtract the body, as shown in Figure 27. Lastly, modify the solid’s surface color. Right-click to select "Surface Attributes" for the entity and configure settings as per Figure 29.
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At this stage, the 3D CAD model of the CPU fan is complete. Thanks to Zhongwang 3D’s user-friendly features, mastering 3D CAD design becomes accessible. Visit Zhongwang Technology Community to explore more 3D content and download CAD/CAM tutorials. Download the latest 3D CAD design software and enjoy free resources: [insert link].
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