Cooking Container Cold-Pressing Assembly for Induction Heat Transfer
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Solution Overview
Problem
Existing methods for manufacturing containers for cooking food using electromagnetic induction heat sources face inefficiencies due to thermal stress, high production costs, and potential disconnection of components, particularly in methods involving hot processes and multiple production plants.
Innovation Solution
A method employing a cold pressing step to connect a ferromagnetic bottom with a non-ferromagnetic body, utilizing a second ferromagnetic element with holes or undercuts for improved anchoring, allowing for a single production plant and reducing thermal stress, thus enhancing coupling and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If brazing is used to join ferromagnetic bottom and non-ferromagnetic body, then connection strength is improved, but production cost increases due to requiring multiple plants and thermal energy expenditure
Solution Approach 1:
The patent combines the joining operation and body forming operation into a single integrated press that performs both functions simultaneously, eliminating the need for separate brazing plant and forming plant, thereby reducing production costs while maintaining connection strength
Solution Approach 2:
The patent replaces the thermal brazing process with a mechanical cold pressing process that uses a press to join the ferromagnetic bottom and non-ferromagnetic body through mechanical force rather than heat, eliminating the need for thermal energy expenditure and specialized brazing equipment
2Strength
If impact bonding with heating to 500°C is used, then connection between bottom and body is improved, but thermal stress causes expansion-contraction transitions leading to potential disconnection
Solution Approach 1:
The patent replaces the thermal impact bonding process with a cold pressing process that uses mechanical force at room temperature to join the components, eliminating thermal cycling and the associated expansion-contraction transitions that cause disconnection, thereby improving connection stability while maintaining connection strength
3Ease of manufacture
If high tonnage pressing at room temperature is used to join perforated bottom with body, then production cost is reduced, but heat transfer efficiency decreases due to holes in bottom
Solution Approach 1:
The patent applies the non-ferromagnetic body to the ferromagnetic bottom before the bottom is exposed to electromagnetic induction heating, allowing the body to be pre-positioned and secured in a single operation, thereby maintaining heat transfer efficiency while keeping production costs low through the cold pressing method
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 method achieves improved heat transfer efficiency, reduces production costs, and minimizes thermal stress-induced disconnection, resulting in a container with enhanced performance on electromagnetic induction heat sources and a higher degree of coupling between the bottom and body.
Implementation Method 1
the bottom in ferromagnetic material heats up due to the eddy currents created due to the effect of the magnetic field generated by the electromagnetic induction heat source
Implementation Method 2
electromagnetic induction heat sources
Implementation Method 3
transferring the heat to the body made of non-ferromagnetic material
Implementation Method 4
Heating is typically performed using an induction device, in which metal coils crossed by current induce an electromagnetic field that passes through the assembly being processed. In particular, this electromagnetic field in turn generates eddy currents in the first element made of ferromagnetic material which thus reaches the desired temperature
Implementation Method 5
this electromagnetic field in turn generates eddy currents in the first element made of ferromagnetic material
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
A method for making a container (C) for cooking food comprises the steps of permanently connecting by means of a pressing step a first component (3) in a non-ferromagnetic material, designed to form the body of said container (C) for cooking food, with a second component (4) in a ferromagnetic material, designed to form a bottom (5) of said container (C) for cooking food and forming the first component (3), with or without the second component (4), to obtain the container (C) for cooking food; the second component (4) is obtained by welding a first element with a second element (2); the second element (2) includes a plurality of holes or undercuts (2c) facing the first component (3) into which the material of the latter is inserted; the container (C) thus obtained is also provided.