When manufacturing power supply equipment, LED lighting, and energy storage systems, many people initially focus on "which heatsink structure to choose." However, with more experience in actual projects, it becomes clear that what truly determines the performance is often not the structure, but the manufacturing process.

The same drawing, produced by different manufacturers, can result in temperature performance differences of several degrees, even tens of degrees Celsius. The problems primarily lie in the details of the manufacturing process. This article will thoroughly explain the most critical control points and common problems in heatsink manufacturing, based on lessons learned from on-site experience.

I. Several Mainstream Heatsink Manufacturing Processes

Let's briefly review the common processes to help understand where the problems originate later.

1. Extrusion Molding

The most common method:

Heating an aluminum rod

Extruding it through a mold

Advantages:

✔ Relatively controllable cost

✔ Suitable for mass production

However, the disadvantages are also obvious:

Fin thickness and spacing are limited by the mold

2. Grinding

Using a cutting tool to "grind" fins out from a whole piece of aluminum:

✔ One-piece structure

✔ Good heat dissipation performance

However, it requires higher standards for equipment and processes. 3. Fin Insertion or Welding Process: The base plate and fins are manufactured separately and then assembled using:

Welding

Crimping

This method offers flexibility, but problems can easily arise with:

Contact Surface

4. CNC Machining: Suitable for complex structures or small batches:

✔ High precision

✔ Flexibility

However, it is more expensive.

II. Key Control Points in the Manufacturing Process: The following points largely determine how well the heatsink performs.

1. Base Plate Flatness: This is often overlooked but is the most crucial factor.

If the base plate is uneven:

Poor contact with the heat source

Reduced thermal conductivity

The actual result is:

The temperature simply won't drop.

General requirements:

✔ Flatness controlled within a reasonable range

✔ No obvious surface deformation

2. Fin Consistency

Fin fins may seem like just a matter of density, but they actually have a significant impact:

Inconsistent height → Turbulent airflow

Uneven thickness → Uneven heat dissipation

Especially with serrated or extruded processes, if not properly controlled:

Overall heat dissipation efficiency will be reduced.

3. Surface Treatment

Many people think it's just about "appearance," but it actually has a significant impact.

Common treatments:

Anodizing

Spraying

More than just aesthetics:

✔ Corrosion protection

✔ Improved radiant heat dissipation

However, note that:

An excessively thick coating can actually impair thermal conductivity.

4. Interface treatment

Especially for spliced structures:

Welding surfaces

Crimping surfaces

If not handled properly:

Thermal resistance will increase significantly.

A reliable approach is:

✔ Controlling contact roughness

✔ Ensuring a good fit

5. Dimensional accuracy control

Dimensional deviations can lead to a chain of problems:

Assembly difficulties

Poor contact

Airflow deviation

Therefore, it's not enough to just consider "whether it can be installed"; you also need to consider:

Whether it's within the design tolerances.

III. Common problems in actual projects

These are problems that almost everyone who has worked on projects has encountered.

1. The radiator itself is fine, but the temperature is high.

Often the problem isn't with the radiator, but with:

Uneven contact surface

No heat-conducting medium used

Insufficient installation pressure

The result is:

Heat isn't transferred in.

2. Batch and sample inconsistency

Typical situation:

Sample is fine

Temperature rises after batch production

The reasons are generally:

✔ Unstable process control

✔ Material batch differences

3. Deformed or collapsed fins

Especially:

Fins too thin

Uneven release of processing stress

This will lead to:

Airflow obstruction, reduced heat dissipation

4. Uneven surface oxidation

The impact is not only on appearance, but also includes:

Reduced corrosion resistance

Fluctuations in heat dissipation performance

5. Cracks or loosening of welded structures

Common in spliced radiators:

Long-term thermal cycling

Thermal expansion and contraction

This leads to:

Increased contact thermal resistance

IV. What to look for when choosing a radiator manufacturer

If you are a purchasing or project manager, you must keep an eye on these things:

1. 1. **Does the manufacturer have practical application experience?**

It's not just about making parts, but rather:

Having worked on similar industry projects

For example:

Power supplies

Energy storage

Industrial control equipment

2. **Can the manufacturer provide test data?**

Including:

✔ Thermal resistance testing

✔ Temperature rise testing

Instead of just providing material parameters.

3. **Is the manufacturing process stable?**

This can be judged by:

Comparing batch samples

And verifying the consistency of actual measurements.

4. Can the manufacturer participate in the early design phase?

Good manufacturers will:

✔ Provide structural optimization suggestions

✔ Preemptively mitigate processing risks

Instead of simply producing according to drawings.

V. A summary of practical experience:

Many people initially look at the structure of a heatsink, only to find that:

The real difference lies in the processing details.

Simply remember:

The contact surface determines the thermal conductivity efficiency

The quality of the fins determines the heat dissipation capacity

Process stability determines batch performance.