Roller Kiln Heating for Tailored Sheet Metal Forming
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Solution Overview
Problem
Existing methods for molding complex-shaped metal components with varying mechanical properties are inefficient due to bulky and energy-intensive kiln lines, leading to undesired deformations and prolonged construction times, which are not compatible with the automotive sector's production rates and economy of production.
Innovation Solution
A method utilizing a kiln with a roller-shaped main body and electronically-controlled heating elements to simultaneously heat multiple sheets to different temperatures, allowing for efficient and localized heating before forming, which reduces energy consumption and forming times, and enables the production of components with local variations in mechanical properties without the need for reinforcing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional bulky kiln lines are used for heating sheets before forming, then the sheets can be heated to achieve desired mechanical properties, but the energy consumption increases and production time is prolonged
Solution Approach 1:
The patent applies local quality by differentiating the heating process into zones: the roller-shaped main body has heating elements distributed on its surface to provide localized heating to specific areas of the sheet. This allows only the regions requiring enhanced mechanical properties to be heated, rather than heating the entire sheet uniformly, thereby reducing overall energy consumption while achieving the desired mechanical property variations in specific component areas.
Solution Approach 2:
The patent implements preliminary action by performing localized heating of the sheet before the forming operation. The heating step is carried out in advance on specific regions of the sheet that will become areas requiring different mechanical properties in the final component. This preliminary differentiation of material properties enables the forming process to create complex shapes with tailored mechanical characteristics without requiring post-forming heat treatments, thus reducing total production time and energy use.
2Manufacturing precision
If traditional bulky kiln lines are used for heating sheets before forming, then the sheets can be heated to achieve desired mechanical properties, but the construction time and production efficiency decrease
Solution Approach 1:
The patent merges multiple functions into a single integrated device: the roller-shaped main body serves simultaneously as a support for multiple sheets, a heating device (with heating elements distributed on its surface), and a transport mechanism (rotating to move sheets through the heating zone). This combination eliminates the need for separate heating chambers and manual handling steps required by traditional kiln lines, significantly reducing production time while maintaining the ability to create components with varied mechanical properties.
Solution Approach 2:
The patent achieves continuity of useful action through the rotating roller mechanism that continuously presents different sheets to the heating elements. As the roller rotates, multiple sheets are heated simultaneously in a continuous process rather than sequentially in discrete batches. This continuous operation maximizes equipment utilization, reduces idle time between heating cycles, and enables high-volume production of components with tailored mechanical properties, directly addressing the production efficiency requirement.
3Productivity
If multiple sheets are heated simultaneously using a roller-shaped kiln, then productivity increases, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the roller-shaped main body to perform multiple functions simultaneously: it supports multiple sheets for heating, provides the heating surface with distributed heating elements, enables rotation for continuous processing, and facilitates sheet transport from inlet to outlet. This multi-functional design allows a single device structure to handle the complexity of processing multiple sheets with differentiated heating requirements, achieving high productivity 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
The method allows for the production of complex-shaped components with reduced thickness and localized mechanical property variations, achieving efficient energy use and shorter production cycles, compatible with automotive sector needs, while avoiding deformations and the need for additional reinforcing elements.
Implementation Method 1
a plurality of heating elements incorporated in said roller-shaped main body and configured to heat a first portion of the roller body, in such a way that the main body with a roller shape is arranged to heat said plurality of sheets in a differentiated form, particularly at their areas in contact with said first portion of the roller body
Data Source
AI summary
A method for molding a sheet into a motor-vehicle component includes heating the sheet by a kiln, prior to forming the component. The kiln has a main body with a roller shape, having a plurality of sectors extending along a radial direction with respect to a longitudinal axis of the roller body. The sectors are configured to each receive a sheet, so that the main body with a roller shape is arranged to simultaneously carry a plurality of sheets. The kiln includes a plurality of heating elements in said main body with a roller shape and configured to heat only the first portion of the roller body, so that the roller shaped main body is designed to heat the sheets in a differentiated way, particularly at their areas in contact with said first portion of the roller body. The kiln includes at least one electronically-controlled drive motor, arranged to rotate the roller-shaped main body around the longitudinal axis of the kiln, so as to vary the position of the sectors with respect to the inlet and outlet ports.