Unstable Dimensions When Cutting Litz Wire Ends | How Dedicated Jigs and Automation Prevent Lead Wire Crushing and Dimensional Overrun

In coil manufacturing operations in Thailand, quality control of Litz wire is one of the processes that requires particularly careful handling. One major issue occurs when the wire is crushed or deformed during terminal cutting, causing the dimensions to exceed those specified in the drawing.

When terminal dimensions vary, this can interfere with assembly in downstream processes and may lead to rework or production delays.

This article explains the causes of crushing and dimensional overrun during Litz wire terminal cutting, as well as improvement methods using dedicated jigs and automation.

Contents

• Dimensional defects in coils caused by crushed Litz wire
• Limitations of manual cutting with nippers
• Precision cutting control using dedicated jigs and automatic air nippers
• Improving efficiency and stabilizing quality in coil manufacturing
• PRONEC’s technical capabilities for optimizing the assembly process
• Frequently Asked Questions
• Keywords for Understanding This Article

Dimensional Defects in Coils Caused by Crushed Litz Wire

Litz wire is a conductor consisting of many extremely fine enamel-coated wires twisted together. While it can reduce losses caused by the skin effect in high-frequency applications, the gaps between the individual wires make it soft and vulnerable to external pressure.

For this reason, when the terminal is cut in preparation for connection, mechanical pressure from the cutting blade can easily crush and deform the cross-section of the wire. If the cross-sectional shape collapses, the outer diameter of the lead wire increases, which can cause the dimensions to exceed those specified in the drawing.

Limitations of Manual Cutting with Nippers

In general manufacturing environments, operators may cut wire terminals manually using nippers. However, when pressure from the cutting edge is applied directly to soft Litz wire, the cross-section can easily deform from a round shape into an oval shape.

Manual work also tends to produce variations in cutting force and cutting angle between operators, making it difficult to maintain consistent quality. As a result, assembly defects and rework may occur, which can reduce production efficiency.

Precision Cutting Control Using Dedicated Jigs and Automatic Air Nippers

To reduce variations caused by differences in operator skill and stabilize the shape of the cut surface, introducing dedicated jigs and automated equipment is effective.

By setting the coil in a dedicated cutting jig, movement and twisting of the lead wire during cutting can be prevented. The automatic air nipper system then moves to the specified terminal position and cuts the wire accurately to the preset length.

This control makes it possible to perform precise cutting while reducing wire crushing and maintaining a cross-sectional shape close to a true circle.

Improving Efficiency and Stabilizing Quality in Coil Manufacturing

By shifting from manual work to an automated cutting process, defects caused by crushed Litz wire terminals can be significantly reduced. Because the cutting dimensions become more stable, downstream assembly work can proceed more smoothly, while rework and disposal losses caused by dimensional defects can also be reduced.

In addition, stable processing can be performed without depending on the operator’s level of experience. This helps reduce variations in takt time and contributes to more stable quality during mass production.

PRONEC’s Technical Capabilities for Optimizing the Assembly Process

PRONEC CO., LTD. utilizes dedicated cutting jig design technology and automated cutting equipment to support the resolution of coil manufacturing issues according to product shape and winding specifications.

The range of products to which this system can be applied is limited depending on the product shape. Therefore, we first confirm the shape, size, and required specifications before proposing the most suitable automation method.

If you are experiencing issues such as unstable Litz wire terminal dimensions or difficulty in assembly due to crushed lead wires, please contact us for consultation.

Frequently Asked Questions

Q. Why is Litz wire easily crushed during cutting?
A. Litz wire consists of multiple extremely fine enamel-coated wires twisted together. Because there are gaps inside the structure and it does not have the same rigidity as a solid wire, the pressure from the cutting edge can easily deform the cross-section when it is cut with ordinary nippers.

Q. Can the cutting system using dedicated jigs and automatic air nippers be applied to all coil products?
A. There are limitations on the product shapes that can be handled by this system. Applicability is determined by confirming the product shape, size, and required specifications and conducting a technical evaluation in advance.

Q. Can introducing automatic air nippers help shorten production takt time?
A. Yes. By automating the careful cutting process that would otherwise be performed manually, the processing time per piece can be stabilized. In addition, the time required for rework caused by dimensional overrun and for sorting defective products can be reduced, which can also improve production efficiency.

Keywords for Understanding This Article

• Litz Wire : A conductor made by twisting together multiple extremely fine enamel-coated wires. It is effective in reducing losses in high-frequency applications, but it is soft and easily deformed by external pressure.
  
  
• Jig : A dedicated tool used to hold parts in the correct position during manufacturing or assembly. It helps improve processing accuracy and work efficiency.
  
  
• Automation : A system in which machines or equipment are controlled to carry out processes consistently without relying on manual work. It helps reduce quality variation and improve production efficiency.

※For consultation regarding coil prototype development, mass production, or various types of winding, please feel free to contact PRONEC.