Self-Heating Mold Adjustment Coil for Quality Factor Control
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Solution Overview
Problem
Self-heating molds with non-resonant oscillating circuits often fail to start high-frequency generators due to low quality factors, leading to inefficient energy transfer and thermal stresses on inductors, as the geometry and technical constraints limit adjustment latitude for optimal heating conditions.
Innovation Solution
Incorporating an additional adjustment coil into the tool circuit, either in series or parallel, allows for the adjustment of the quality factor and resonance characteristics, enabling the mold to operate with any generator and ensuring efficient energy transfer without excessive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oscillating circuit geometry is fixed by technical constraints, then the mold structure is stable, but the quality factor is too low for generator startup
Solution Approach 1:
The inductor circuit is segmented into two independent parts: the original inductor L1 with fixed geometry constrained by mold technical requirements, and an additional adjustment inductor L2 that can be independently tuned. This segmentation allows L1 to maintain the stable geometric structure required by the mold while L2 provides the necessary quality factor adjustment capability for generator startup.
Solution Approach 2:
The additional adjustment inductor L2 acts as an intermediary element that mediates between the fixed geometric constraints of the original circuit and the variable quality factor requirements. By introducing this intermediate component, the system can achieve the necessary resonance conditions without modifying the original inductor geometry, thus maintaining structural stability while enabling generator startup.
2Use of energy by moving object
If the inductor path is fixed by cavity shape constraints, then the heating distribution is stable, but the quality factor cannot be adjusted for optimal energy efficiency
Solution Approach 1:
The total inductance is segmented into L1 (fixed by cavity constraints) and L2 (adjustable). The circuit equation shows that the quality factor Q = (L1 + L2)/R1, where L2 can be varied independently to optimize energy efficiency without changing the fixed L1 geometry. This segmentation provides the adaptability needed for quality factor adjustment while preserving the stable heating distribution determined by L1.
Solution Approach 2:
The system transitions from a static, fixed inductance configuration to a dynamic configuration where L2 can be adjusted. The adjustable inductor L2 introduces dynamics to the circuit, allowing the quality factor to be tuned for optimal energy efficiency while L1 maintains the stable geometric foundation required by the cavity shape constraints.
3Temperature
If the fixed inductor circuit is used, then the mold structure is simple, but excessive heating occurs due to poor resonance conditions
Solution Approach 1:
The inductor system is divided into L1 (original, fixed) and L2 (adjustment, variable). By adjusting L2, the quality factor Q is optimized to improve resonance conditions, which reduces energy loss and prevents excessive heating of the inductors. The segmentation allows L1 to maintain structural simplicity while L2 provides the necessary control capability for temperature management.
4Reliability
If the quality factor is increased for generator startup, then resonance efficiency improves, but the circuit becomes more sensitive to frequency variations
Solution Approach 1:
The adjustable inductor L2 provides dynamic control over the quality factor Q. When generator startup is required, L2 can be increased to achieve high Q and efficient resonance. During normal operation, L2 can be adjusted to optimize performance while managing frequency sensitivity. This dynamic adjustment capability allows the system to adapt to different operational requirements.
Solution Approach 2:
The system utilizes parameter changes by varying the inductance of L2 to control the quality factor Q. By changing this parameter, the system can optimize resonance efficiency for generator startup while managing the trade-off with frequency sensitivity. The ability to modify this parameter provides flexible control over the resonance characteristics.
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
The adjustment coil ensures a high enough quality factor for generator startup while preventing excessive heating, allowing for optimal heating distribution and energy efficiency, making the self-heating mold independent of specific production environments.
Implementation Method 1
a self-heating mold comprises two mold bodies defining a forming cavity... the inductors consist of electrical conductors extending in grooves or bores, forming closed cavities... A high-frequency current generator operates by resonating the oscillating circuit formed by the inductor and the load heated by it
Implementation Method 2
the heating is obtained by circulating a high frequency alternating electric current in the said inductors, which generates induced currents causing the heating of the ferromagnetic part of the mold
Implementation Method 3
When this condition is not met, the energy supplied by the generator is consumed by the Joule effect in the conductors forming the inductors
Implementation Method 4
the heating is obtained by circulating a high frequency alternating electric current in the said inductors, which generates induced currents causing the heating of the ferromagnetic part of the mold
Implementation Method 5
Part of the mold body is made of a ferromagnetic material which is subjected to the effect of the inductors
Implementation Method 6
this part of the mold body... transmits this heat by conduction to the impression and finally to the material constituting the future part from the mold
Data Source
Figure 1~3B
Figure 4~5
AI summary
The invention relates to a mold (200) comprising a self-contained heating device, said mold including: a) a mold body (210, 220) comprising an induction heating circuit, referred to as an equipment circuit, having a resistance R1 and an inductance L1, said equipment circuit including an inductor (215, 225) extending inside a closed cavity of the mold body; b) connection means (250) for connecting the equipment circuit to a high-frequency current generator; and c) characterized in that it includes a so-called adjustment coil placed between the equipment circuit and the connection means (250), said coil having a resistance R2 and an inductance L2 that does not induce current in the mold body and being connected to the equipment circuit.