Zigzag Induction Coil for Uniform Hardening
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Solution Overview
Problem
Existing induction hardening methods face challenges with complex shapes, requiring large coils and high power, leading to inefficient heating and potential soft zones due to thermal expansion, especially when treating large or deformed workpieces.
Innovation Solution
An induction hardening apparatus and method utilizing a zigzag-shaped heating conductor portion that moves relative to the workpiece, allowing for efficient heating of complex shapes with reduced power consumption and preventing soft zones by maintaining appropriate gap dimensions through adjustable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large induction heating coil is used to treat large treatment objects, then the treatment coverage is improved, but the power consumption increases and heating efficiency deteriorates
Solution Approach 1:
The treatment target portion is divided into multiple regions (first region and second region) that are heated by separate heating conductor portions. This segmentation allows each heating zone to be optimized independently, treating large areas without requiring a single large high-power coil, thus reducing overall power consumption while maintaining treatment coverage.
Solution Approach 2:
The heating conductor portions are arranged in different spatial dimensions (different positions along the treatment target) rather than using a single large coil. This dimensional arrangement allows multiple heating zones to operate simultaneously with lower power requirements, improving heating efficiency while covering large treatment areas.
2Adaptability or versatility
If the induction heating coil is made larger to accommodate treatment object deformation, then the adaptability is improved, but the heating efficiency deteriorates due to increased gap
Solution Approach 1:
The heating system is segmented into multiple independent heating conductor portions that can be positioned at different locations. This allows each segment to maintain an appropriate gap with the treatment object even when the object deforms, preserving heating efficiency while adapting to shape changes.
Solution Approach 2:
The heating conductor portions are positioned to accommodate dynamic changes in the treatment object's shape during heating. By having multiple adjustable heating zones rather than a single fixed large coil, the system adapts to thermal expansion and deformation while maintaining optimal heating gaps, thus preserving heating efficiency.
3Use of energy by stationary object
If a scanning heat treatment method is used to treat large areas, then the power consumption is reduced, but the treatment time increases and treatment efficiency deteriorates
Solution Approach 1:
Multiple heating conductor portions operate simultaneously to heat different regions of the treatment target at the same time. This parallel processing approach combines the benefits of lower power consumption (comparable to scanning methods) with reduced treatment time (unlike sequential scanning), thereby improving overall treatment efficiency.
Solution Approach 2:
The multiple heating conductor portions enable continuous simultaneous heating across different regions without interruption or sequential movement. This continuous parallel action eliminates the time loss associated with scanning methods while maintaining lower power consumption, thus resolving the contradiction between treatment time and energy usage.
4Manufacturing precision
If multiple heating devices are used to treat different regions, then the heating uniformity is improved, but the device complexity increases
Solution Approach 1:
The heating conductor portions are designed with a universal structure that can be applied to different treatment regions and configurations. This multi-functional design allows the same basic heating element structure to serve multiple purposes and locations, achieving uniform heating across different regions without proportionally increasing device complexity.
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
Enables high-speed, uniform heat treatment with improved efficiency and reduced power requirements, effectively addressing the limitations of traditional methods by ensuring consistent heating across large or irregularly shaped workpieces without soft zones.
Implementation Method 1
an induction heating coil 226 that inductively heats a treatment target portion N1 of a workpiece W1
Implementation Method 2
a movement support unit 211 that rotates the workpiece W1 on a center axis C1
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An induction hardening apparatus comprises heating coils (26) that inductively heat different parts of the treatment target portion (A) in an axial direction of the work (12), the work (12) and a heating coil (26) being relatively moved along a circumferential direction (R) of a treatment target portion (A). The heating coil (26) has a zigzag shape in which a bent portion (34) that is opened to one side in the axial direction and a bent portion (35) opened to the other side in the axial direction are alternately continuously arranged in opposed directions along the circumferential direction (R).