【Induction Heating Coils】Designed and Manufactured in Thailand to Match Workpiece Shapes and Heating Conditions｜Repair and Redesign Services Available

K.D. HEAT TECHNOLOGY (THAILAND) CO., LTD. provides design and manufacturing services for high-frequency induction heating coils in Thailand, as well as coil repair and redesign.

Induction heating coils are important components that determine which part of a workpiece is heated and how it is heated. We consider the appropriate coil shape according to conditions such as the workpiece shape, target heating area, required hardness, and case depth.

Table of Contents

• Why induction heating coils affect heating quality
• Coil design and manufacturing according to workpiece shapes and heating conditions
• Why coil cooling is important for stable heating
• Repair and redesign of existing coils
• Frequently asked questions
• Keywords for understanding this article

■　Why induction heating coils affect heating quality

In high-frequency induction heating, a high-frequency current is passed through a coil to generate a magnetic field, which induces an electric current in the workpiece and heats it.

For this reason, the location and range of heating are greatly affected not only by output and frequency, but also by the coil shape and its positional relationship with the workpiece.

When the shape of the workpiece changes, such as shafts, gears, or sprockets, the suitable coil shape also changes. Even for the same workpiece, the coil shape may need to be reviewed if the heating location or required hardened area differs.

At K.D. HEAT, we consider the coil shape after confirming not only the workpiece shape but also the target heating location and required heat treatment conditions.

■　Coil design and manufacturing according to workpiece shapes and heating conditions

Simply matching the induction heating coil to the shape of the workpiece is not sufficient.

We consider a coil shape that can efficiently apply heat to the required area based on factors such as the workpiece material and shape, heating location, required hardness, case depth, operating frequency and output, and production conditions.

At K.D. HEAT, we design and manufacture coils while considering the actual heating conditions, drawing on our experience in both the design and manufacture of high-frequency induction heating equipment and heat treatment processing.

We can also discuss applications that are difficult to handle with standard coil shapes, such as workpieces with complex geometries or applications where only a specific area needs to be heated.

In addition to coils for new equipment, we also design and manufacture replacement coils for use with existing high-frequency induction heating equipment.

■　Why coil cooling is important for stable heating

In high-frequency induction heating, heat is generated not only in the workpiece but also in the coil itself.

As the coil temperature rises, conditions such as electrical resistance change, which may cause fluctuations in heating conditions during continuous production.

For this reason, maintaining stable heating conditions requires consideration not only of the coil shape but also of cooling inside the coil.

At K.D. HEAT, we regard cooling of the coil itself as an important factor in stabilizing heating conditions and design coils while taking into account temperature changes during continuous operation.

By considering not only the heating and cooling of the workpiece but also the temperature control of the coil, we aim to maintain stable heat treatment quality.

■　Repair and redesign of existing coils

We also provide repair and redesign services for induction heating coils currently in use.

Repeated use can cause wear or damage to coils, and depending on their condition, this may affect the heating position or heating performance.

After checking the condition of the existing coil, the workpiece, the equipment in use, and the current heating conditions, we consider an appropriate approach for each application, including repair, remanufacturing, or redesign.

If the workpiece shape has changed, the required heating position or hardened area has been modified, or the current coil does not provide stable heating conditions, the coil shape itself can also be reviewed.

Rather than simply reproducing the existing shape, redesigning the coil according to the current workpiece and heating conditions can help maintain and improve stable heating and heat treatment quality.

※For inspection, repair, overhaul, and rebuilding of complete high-frequency induction heating equipment, please refer to the related article below.

■　Frequently Asked Questions

Q1: Can I consult you about the design and manufacturing of a new induction heating coil?
A1: Yes. After confirming the workpiece shape, target heating location, equipment in use, and required heat treatment conditions, we can design and manufacture the coil.

Q2: Can you handle workpieces with complex shapes?
A2: Yes. We confirm the workpiece shape, heating location, required hardened area, and other conditions, and consider a coil shape suited to the application.

Q3: Can you repair a coil that is currently in use?
A3: Yes. We inspect the condition of the existing coil and consider appropriate options such as repair, remanufacturing, or redesign.

Q4: Can you manufacture only a coil for use with existing high-frequency equipment?
A4: Yes. After confirming the specifications of the equipment in use, the existing coil, the workpiece, and the heating conditions, we consider a suitable coil.

Q5: If the workpiece or heating conditions change, can the shape of the existing coil be modified?
A5: Yes. We confirm the modified workpiece shape, heating location, and required heat treatment conditions, and redesign the coil as necessary.

■　Keywords for understanding this article

• High-frequency induction heating: A method of heating the required area of a metal workpiece using electromagnetic induction
• Induction heating coil: A coil used to generate a magnetic field with high-frequency current in order to heat a workpiece
• Case depth: The depth from the surface at which the required hardness has been obtained through hardening
• Coil cooling: Cooling used to suppress temperature rise during continuous operation and stabilize heating conditions
• Coil redesign: Reviewing the coil shape according to changes in the workpiece shape or heating conditions, or issues with an existing coil

※For more details, please download the attached materials or contact us via the form below.