Inductive Coupling for Induction Hardening Coil Power

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Solution Overview

Problem

Conventional induction hardening processes require manual electrical connections between inductor coil halves, leading to maintenance burdens and potential gaps in the electric field, necessitating part rotation, which complicates the process and slows down cycle times.

Innovation Solution

The use of inductive coupling to power both inductor coil half sections simultaneously through a primary conductor loop positioned between secondary conductor loops, eliminating the need for direct electrical connections and ensuring a continuous electric field without gaps, allowing for automated part loading and processing without rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrical connections are made between inductor coil halves, then power can be transmitted through the complete inductor coil, but the connections are subject to wear and present a maintenance burden

Engineering Contradiction:

Improveinductor coil power transmissionVSAvoidelectrical connection maintenance

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

A wear-resistant electrical connection element is introduced as an intermediary component between the two inductor coil halves. This mediator element is designed to withstand wear and can be replaced independently, protecting the main coil structures from degradation and simplifying maintenance procedures.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The electrical connection function is extracted from the main inductor coil structure and implemented as a separate, replaceable component. This allows the connection element to be independently maintained or replaced without affecting the coil halves, reducing overall system maintenance burden.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If electrical connections are made between inductor coil halves, then the circuit is completed, but the process of loading the part is slowed

Engineering Contradiction:

Improveinductor coil circuit completionVSAvoidpart loading speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The electrical connection element is pre-positioned and prepared before the inductor coil halves are assembled. This preliminary preparation allows the coil halves to be quickly brought together and connected without requiring time-consuming connection operations during the part loading process, thereby increasing productivity.

Inventive Principle:

Principle #10Preliminary action

3Power

If conventional inductor arrangement is used, then power can be applied to the inductor, but gaps in the electric field are formed creating uneven hardening

Engineering Contradiction:

Improveinductor power applicationVSAvoidhardening uniformity

Core Design Contradiction:

PowerVSManufacturing precision

Solution Approach 1:

The electrical connection element serves as a mediator that bridges the two inductor coil halves in a way that maintains electromagnetic field continuity. This intermediary component is positioned and designed to prevent gaps in the electric field, ensuring uniform induction hardening across the workpiece surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Manufacturing precision

If part rotation is implemented to prevent uneven hardening, then hardening uniformity is improved, but equipment complexity increases and cycle time increases

Engineering Contradiction:

Improvehardening uniformityVSAvoidequipment complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The potential harm of electric field gaps is eliminated by proper positioning of the electrical connection element, which acts as a field-continuing mediator. This converts the problematic gap formation into a benefit where the connection element itself helps maintain field uniformity, removing the need for part rotation and associated equipment complexity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution facilitates faster and more automated induction hardening by eliminating the need for manual connections and part rotation, enabling simultaneous treatment of multiple parts and reducing equipment complexity while maintaining consistent hardening quality.

Implementation Method 1

inductive coupling in common simultaneously to both inductor coil half sections... applying the power to primary conductor loop which is positioned between respective secondary conductor loops connected to the respective inductor coil half sections

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a high frequency voltage is applied to the inductor. This induces a current in the surface of the part... rapidly heating the same to a desired temperature

Methodology Applied

Scientific EffectInduction heating: Induction Heating

Implementation Method 3

induces a current in the surface of the part... rapidly heating the same

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS8716636B2Arrangement and method for powering inductors for induction hardening

Publication Date: 2014.05.06 BOLLMAN JOHN C

AI summary

An arrangement for induction hardening a part including a pair of separate inductors electrically isolated from each other and configured to substantially surround a part when brought into close juxtaposition with each other. The inductor sections are powered by respective secondary inductor loops brought into close juxtaposition with a primary inductor loop connected to an ac power source which induces an ac current in each inductor section.