Induction Coil Cooling in Spin Forming for Uniform Plate Heating
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Solution Overview
Problem
Conventional spinning forming devices with doubled circular-arc coils face melting issues due to excessive heat generation during the spinning forming process, which affects the device's longevity and performance.
Innovation Solution
A spinning forming device configuration that includes a rotating shaft, a processing tool, a rear-side heater, and a front-side heater with electric conducting pipes having doubled circular-arc shapes, where the pipes are cooled by a circulating cooling liquid to prevent melting, and the heaters are connected in series for efficient induction heating and parallel cooling to ensure uniform heating and effective heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a doubled circular-arc coil portion is used for induction heating, then heating efficiency is improved, but the coil portion melts due to excessive heat generation
Solution Approach 1:
A cooling liquid is introduced as an intermediary substance to flow through the coil portion, absorbing excessive heat and preventing the coil from melting while maintaining efficient induction heating of the workpiece
Solution Approach 2:
A hydraulic cooling system is implemented where cooling liquid is circulated through channels in the coil portion, using fluid dynamics to transfer heat away from the coil and prevent thermal damage
2Area of stationary object
If the coil portion extends in the rotational direction with doubled circular-arc shape, then heating coverage is improved, but the area receiving heat radiation from the plate increases causing melting
Solution Approach 1:
Cooling liquid acts as a mediator that absorbs heat radiation from the plate and transports it away, allowing the coil to maintain large heating coverage without suffering from excessive temperature rise
Solution Approach 2:
The thermal parameters of the coil are changed by introducing continuous cooling, which alters the heat balance equation to allow larger surface area exposure to plate radiation without causing melting
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
Prevents the coil from melting, ensures uniform heating of the plate from both sides, and enhances formability by maintaining the coil's integrity and improving heat distribution, allowing for deeper current penetration and effective cooling.
Implementation Method 1
a rear-side heater disposed at an opposite side from the processing tool across the plate, that locally heats the transform target portion by induction heating
Implementation Method 2
the coil portion extending in a circumferential direction of the rotating shaft and having a doubled circular-arc shape facing the plate
Implementation Method 3
a circulating device that supplies a cooling liquid to one of the pair of connection boxes and recovers the cooling liquid from the other to circulate the cooling liquid through the electric conducting pipe
Implementation Method 4
a processing tool that presses a transform target portion of the plate to transform the plate
Data Source
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AI summary
A spinning forming device includes: a rotating shaft that rotates a plate to be formed; a processing tool that presses a transform target portion of the plate to transform the plate; and a heater that locally heats the transform target portion by induction heating. The heater includes an electric conducting pipe, and the electric conducting pipe includes a coil portion extending in a circumferential direction of the rotating shaft and having a doubled circular-arc shape facing the plate. A cooling liquid circulates through the electric conducting pipe by a circulating device.