Conformal Cooling vs Conventional Cooling: Which One is Better?

Cooling is an important step in injection molding, and poor cooling can ruin the part’s performance and quality. Moreover, it will increase the cycle time and cost of production. Are you also spending hours and hours fixing warpage, uneven surfaces, and sink marks, and wondering if there’s a solution for this frustration? Yes, of course. Conformal cooling? Good catch! 

In this blog, you will get a complete guide on Conformal Cooling vs. Conventional Cooling, how they work, their pros and cons, and which type is best for your part, regarding volume, geometry, speed, and budget. So, let’s dive in!

What is Mold Cooling and Why Is It Important?

In injection molding, mold cooling is as important as the other steps of the process. It controls how fast a product will solidify and take its final shape. Proper and even cooling ensures accurate part geometry and allows the part to release smoothly from the mold.

The cooling step is really important because it directly affects how speed of production and the final look of the part. Yes, if the mold cools down too slowly, it will drag the process of molding. Apart from this, if the cooling were uneven, the part can bend or shrink. So, good cooling is not just about solidifying a part; it affects the quality and cost of production to a great extent. 

Why Cooling Efficiency Is Critical?

Cooling efficiency directly affects the rate of production and quality of the part. A swe discussed, if the cooling is too slow, it will cool the part unevenly, and ultimately it will slow everything down. In contrast, if cooling is fast and even, production will be done faster with efficiency. Therefore, it will lower the overall cost of production. 

Improper cooling poses a lot of problems; it can cause sink marks, residual stress, or warpage. For example, if a container is on the cooling stage and it cools down faster from one side only, the other side may twist.  

In addition, good cooling offers energy efficiency. If the temperature is equal all over the area, the machine does not need to work harder to maintain the pressure or heat. So, it will cut down on electricity use. Therefore, you will get quality parts in the minimum time, while spending less time on fixing defects.

“In injection molding, there are basically two types of cooling: Conventional cooling and conformal cooling.”

Conventional cooling: It is a basic type of cooling that has straight drilled channels for cooling of the mold.

Conformal cooling: As the name suggests, conformal cooling has curved channels that are prepared according to the shape of the part. 

Each method has its own accuracy level, costs, and cycle time. In the next sections, we will explore both types completely. Stay connected!

Conventional Cooling System Overview

What is conventional cooling system? Okay! A conventional cooling system is a type of cooling system that uses straight channels to cool the mold. Water is passed through these cooling channels. Generally speaking, conformal cooling channels in injection molding are very common. What happens is that these water channels absorb the heat from the mold walls, ultimately solidifying the part.

You know, channels are straight; therefore, they are not very complex to manage. Conventional cooling has been used from last many years. Still, it is in use for standard molding projects. 

Design Characteristics

• Linear Layout: You know, channels are straight, simple, and they follow a clear path. There are no bends or curves. Irrespective of the part shapes, the channels are just straight.

• Uniform Diameter: Channels are equally thick from all sides. They have a consistent diameter that circulates water in equal quantities in all areas of the channel.

• Limited Flexibility: As the channels are straight, it becomes difficult to reach the deep and complex areas of the mold. Some specific points can’t be targeted.

• Standard Tool Compatibility: As the setup is not very complex, you can drill them with common CNC tools. So, it says that the process is accessible and cost-effective.

• Flew Visibility: Due to the simplicity of the channels, the flow of water is predictable. But it is not efficient for complex geometries.

• Simple Maintenance access: You can easily check for any wearout, damage, or leaks. There’s no need for any special equipment.

Pros of Conventional Cooling System

Simple design: Due to its simple assembly, this cooling system is easy to plan and implement. Almost all mold makers are familiar with these straight channels; therefore, no complex engineering is required 

Fast Manufacturing: It has a simple setup, and all the work can be done with standard tools. So, the whole process is quick and time-saving. 

Low Cost: A conventional cooler is very common; it is not very expensive. So, it is ideal for projects where you want to keep the budget low.

Easy maintenance: You know, it is easier to clean the straight channels than the complex ones. So, it saves your time in this way, also.

Reliable for standard parts: If the geometry of the mold is not complex, a conventional cooling tower is best. The part will cool down evenly with efficiency.

Consistent Performance: For basic molds (having flat surfaces or basic shapes), conventional cooling offers expected results. 

Easy to Source: As the channels are not difficult to manufacture; therefore, they are easily available.

Good for small batches: For low-volume production, conventional cooling can work efficiently.

Cons of Conventional Cooling System 

Uneven temperature: Straight cool conventions cannot access some deep parts of the mold, resulting in uneven cooling. It can affect the quality of the part. 

Longer cycle time: When there is slow or uneven cooling, the part will take more time to solidify. So, it increases the cycle time and will cause delays. 

Poor heat removal: Due to poor heat removal from the complex areas, like deep pockets, corners, or curved surfaces, parts would have defects. 

High Defect rate: It has been seen that conventional cooled parts are more suspected to defects. For example, warpage, sink marks, and stress marks.

Limited optimization: If your part has a complex pattern, then conventional cooling is not good. So, it does not offer you much freedom of customization. 

Energy inefficiency: You know, cycle rates are higher with conventional cooling, so it requires more power.

Lower part accuracy: As cooling cannot be delivered equally to all parts of the mold, it will give inconsistent results. 

Slower ROI: Slow production and higher defects will increase the overall costs of the operation.

Conformal Cooling System Overview

What is conformal cooling? Okay! A Conformal Cooling system is an advanced system in which channels follow the shape of the mold. They are not simply straight; they have curves, twists, and wraps around the geometry of the mold. Therefore, every part of the mold receives equal cooling. Well, these channels are closer to the surface of the mold, so the heat dissipates more quickly from the mold. Hence, it creates a stable temperature inside the mold. 

Due to the consistency in temperature, the material inside the conformal cooling mold solidifies evenly. As a result, you get quality parts having fewer defects, tight tolerance, and a smooth surface.

Design Characteristics

Geometry aligning channels: These channels follow the shape of the part by having curves and contours. 

Optimized heat transfer: As channels reach each part of the mold with equal distance, the deep areas get equal cooling. 

High design flexibility: You know, cooling will each part, no matter what your design is, how complex it is. So, you have the freedom to design parts of intricate patterns, also.

Better flow control: Heat removal is very consistent. Due to the curved paths of the conformal cooling design, the cooling flow is equal for all parts. 

Pros of Conformal Cooling System

Efficient and uniform cooling is the main benefit of using conformal cooling in injection molding because channels follow the part’s contour. 

Other benefits are; 

Better temperature control: Cooling channel spreads all over the mold sides. So, there will be fewer chances of defects and internal stresses. Irrespective of the thickness and thinness of different areas of the part, cooling will be equal at all sides. 

Shorter cycle time: Due to continuous cooling, heat is removed faster, hence parts will solidify more rapidly. Ultimately, it reduces labour costs and offers faster delivery times.

High-quality parts: As each part gets equal cooling, they have good dimensional accuracy, smooth surfaces, and fewer defects. So, there would no no bending, shrinkage, or warping in the parts. 

Energy efficiency: As the temperature is controlled well, machines have no need to utilize much power. It lowers your electricity bills, supporting sustainable production.

Good consistency: Due to the high production rate, conformal cooling offers consistent results in high-volume production. Each part in the hundreds or thousands has the same quality.

Cons of Conformal Cooling System 

Higher cost: Conformel cooling has an advanced design and complex setup, which increases its initial cost. Well, for large companies, it’s beneficial in the long run. But for small projects, it can be a concern.

Complex design: The designs of these channels are very complex, similar to the part. So, engineers need to be very careful while designing the channel paths. Otherwise, it will reduce the efficiency of the whole molding process. 

Manufacturing limits: These complex channels can’t be created through any method. No! They can’t be designed by additive manufacturing or hybrid methods only. Not all shops don’t have the necessary equipment to create these channels. 

Difficult maintenance: As there are curves and twists in conformal channels, they can’t be maintained or repaired easily. They make checks and fixes more complex and time-consuming.

Longer lead time: Conformal channels are not easily created. Engineers have to plan, print, and then manufacture channels. After that, finishing is also done to make them more efficient. 

How Conformal Cooling Channels Are Made?

Additive manufacturing methods—such as conformal-cooling 3D printing, DMLS, and SLM—create conformal channels by adding material layer by layer. This layer-by-layer addition can easily craft complex channels. They can add curves, twists, and other details with accuracy. This way, channels will reach even the thickest and hottest areas of the mold.

If we talk about conventional CNC drilling, it can make only straight channels. You cannot create deep pockets, curves, or twists. But additive manufacturing poses some challenges, like;

• Powder removal: While manufacturing, powder of the manufacturing material can get stuck in the channels; it should be cleaned before usage.

• Support required: Some areas need support to come into their final form. After manufacturing, those support structures are removed.

• Post-processing: After manufacturing, channels require some post-processing, like heat treatment, machining, and polishing.

There’s a difference in cost and time, also. As additive manufacturing is complex than traditional methods, it takes more time. Moreover, the upfront cost is also high. But for many companies, the investment is beneficial in the long run. Conformal cooling offers faster cycle times, fewer defects, and consistent part quality. 

So, we can say that conformal cooling is not just an upgrade in the design of channels; it is a long-term solution that prepares parts more precisely and produces less waste. 

Conformal vs. Conventional Cooling Comparison

These two cooling systems differ in various aspects, including design complexity, cooling efficiency, ease of setup & maintenance, energy consumption, and their pricing. 

Let’s look at the head-to-head comparison of conformal cooling vs conventional cooling in the table below. 

Factor	Conformal Cooling	Conventional Cooling
Design Complexity	Channels are highly complex as they have to follow the shape of the mold, requiring complex engineering and advanced software.	These channels can be easily designed with drilling. They are easy to manufacture.
Cooling Uniformity	Conform channels are very close to the surface of the mold, equally from all sides. Therefore, it offers equal cooling.	As channels are straight, they can’t provide equal cooling to all hot spots of the part.
Cycle Time	Heat leaves the mold faster, therefore reducing the production time.	As cooling does not reach all the hot spots of the mold evenly, it increases the cycle time.
Mold Cost	As a 3D setup is complex, it incurs more cost than a traditional setup.	Drilling channel is not very expensive, therefore it is better for small companies.
Energy Efficiency	Due to even cooling, machines consume less power. So, there are fewer expenditures of electricity.	As mold cannot get cooling equally on all sides, it lowers efficiency.
Part Quality	As conformal channels are so accurate, they produce fewer defects. Moreover, they offer better accuracy and smooth surfaces.	There are more risks with a conventional cooling system. These channels cause defects, like warpage, sink marks, and stress.
Mold Life	Due to even cooling and fewer defects, conformal cooling helps increase the longevity of the part.	Conventional cooling creates thermal stress and defects, ultimately reducing the life of the part.
Maintenance	Due to complex channels, they are difficult to maintain and repair.	Due to its simple design, conventional channels are easy to maintain.

Overall, we can say that conformal cooling has a lot of advantages over conventional cooling. It can deal with strict tolerances, complex conformal cooling channel design, and high-volume production. Moreover, it boosts energy efficiency, improves quality, and speeds up the operation. But if the part is simple, you can use conventional cooling. It is cost-effective and easy to perform.

When to Use Each Cooling Method

The selection of the conformal convention cooling depends on the shape of the part, the level of production, and the budget. Each type has its own strength, but choosing the right cooling system is important to achieve the best results. In this section, we will discuss when you have to choose conventional cooling and when conformal cooling can prove best. Have a look;

Best Applications for Conventional Cooling

The conventional cooling is ideal for the injection molding of simple parts and products, DIY projects, and basic prototypes. Let’s further break down the applications. 

• Simple part geometry: If the part has flat surfaces and a basic shape, go for conventional cooling. There’s no need to arrange a complex cooling system. Moreover, with simple parts, there will be fewer chances of defects.
• Low-volume production: You know, in a conventional cooling setup is simple and cheaper. So, if you have to create a prototype or want production within a limited time, conventional cooling can prove better.

• Budget-friendly projects: If you want good results without so much money, cool conventions to go to. But your part design should not be very complex; otherwise, good results can be a challenge.

• Easy Maintenance: As we discussed, straight cannels are easy to maintain. So, if you want fewer shutdowns and fewer maintenance needs, then conventional cooling can be a better choice. Moreover, when you do maintenance or repairs, it will be done quickly.

• Basic Consumer Products: To make everyday use products, like caps, lids, clips, or any other household items that do not have a complex shape, can be easily cooled with conventional cooling. 

Best Applications for Conformal Cooling

Conformal cooling injection molding is ideal for complex components having intricate internal features and irregular contours.  Let’ break down the applications. 

• Complex and intricate designs: if the part has curves, corners, twists, and deep pockets, conformal cooling is the best choice. As channels will align with the shape of the part, every part will get equal cooling. Therefore, designers can easily design intricate patterns without worrying about the cooling.

• Uneven Walls: You know, slow cooling can cause defects in thick walls. Conformer channels stay close to the mold, following the mold. Therefore, doesn’t matter the thickness of the wall, heat will dissipate equally.

• Tight-tolearance: If you need high quality part with tight tolerances, then go for conformal cooling, as here part will get even cooling. There will be no defects or stress in the part. If you want the part to follow exact specifications,  conformal channels can fulfill the demand.

• High-Volume Production: You know, cycle time is really important in high-volume production. And, conformal cooling can decrease cycle time to a great extent. Therefore, it is a better choice for making parts in large quantities.

• Long-term cost savings: No doubt, the complex setup of a conformal cooling system is a considerable investment, but if we analyze it in the long run, it is worth the investment. It lowers the defect cycle time, ultimately offering you bigger rewards.

How RapidDirect Supports Advanced Cooling Mold Solutions

RapidDirect offers you both types of cooling systems and supports you in choosing the most efficient cooling system according to your project requirements. Our top-notch manufacturing setups—such as DMSL, CNC machining, and hybrid cooling designs—give you full flexibility in choosing the best solution.. You can choose the service based on your budget and part geometry. Apart from this, we also offer cooling optimization consulting; our engineers will thoroughly study your part geometry and suggest the channel that can prove best for your project.

Moreover, RapidDirect also provides you with an integrated validation-to-production service. It is a complete package, from design to manufacturing of the mold to large-volume production, you will get all under one roof. So, it will save your time, money, and costs. You can visit our website by clicking here.

Conclusion

Alright! A good choice matters the most. Know your part design, your budget, and required specifications, and choose the one that fits best. Convention cooling is ideal for simple parts and cost-conscious projects. Conformal cooling is suitable for complex shapes and high-volume productions. If you want fast cycles and high-quality parts with consistent, conformal cooling can prove best. Well, again, the choice totally depends on the needs of your project.

If you want optimized cooling outcomes, then get an instant Quote from RapidDirect now. Our conformal cooling solutions will reduce defects, boost efficiency, and offer consistency in every batch. Trust RapidDirect and get confident results!

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