Composite Roller Wedge Keys Annealing
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Solution Overview
Problem
Rollers used in high-temperature annealing lines face challenges such as limited service life due to wear, fragility, and deformation under temperature changes, leading to issues like 'heat buckles' and poor guidance, and existing composite material solutions complicate rotation and expansion compensation, increasing manufacturing costs and energy consumption.
Innovation Solution
A roller design featuring a cylindrical casing made of thermostructural composite material with a metallic axial support element and wedge-shaped keys that allow for simple rotation and compensation of differential expansions, maintaining geometry under high temperatures and reducing stress on the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a roller having a shell made of C-C or SiC-SiC composite material is used, then thermomechanical performance at high temperatures is improved, but the complexity of the installation increases due to the need for active cooling of the shaft
Solution Approach 1:
The system uses passive thermal expansion compensation through the radial play mechanism between the metal shaft and composite shell, eliminating the need for active cooling systems. The differential expansion is automatically managed by the mechanical clearance design, allowing the shaft to expand freely while maintaining functional connection.
Solution Approach 2:
The invention changes the thermal management approach from active cooling (controlling temperature) to passive accommodation (allowing thermal expansion). By designing the coupling mechanism to accommodate dimensional changes, the system adapts to temperature variations without requiring complex active thermal control systems.
2Strength
If a metal shaft is used to ensure mechanical strength, then strength is improved, but differential thermal expansions between the shaft and composite shell must be compensated
Solution Approach 1:
The radial play is pre-designed into the coupling mechanism during manufacturing, allowing the metal shaft to expand thermally without creating excessive stresses on the composite shell. The clearance is built-in to anticipate and accommodate the expected thermal expansion range.
Solution Approach 2:
The invention explicitly accounts for thermal expansion by providing radial play between the metal shaft and composite shell. This mechanical clearance allows the shaft to expand freely at high temperatures while maintaining rotational connection, converting the thermal expansion problem into a simple dimensional accommodation solution.
3Stability of the object's composition
If radial play is provided between the shaft and casing to compensate for differential expansions, then expansion compensation is improved, but the manufacture complexity increases due to grooves and teeth
Solution Approach 1:
The radial play is pre-established through simple machining of the shaft and housing bores, avoiding the need for complex grooves and teeth. The clearance is built-in during manufacturing as a basic dimensional tolerance, making the design easier to manufacture while achieving the same expansion compensation function.
4Stability of the object's composition
If significant cold radial play is provided between the casing and shaft, then expansion compensation is improved, but cold positioning (centering) becomes difficult
Solution Approach 1:
The invention uses a keyed coupling mechanism that provides asymmetric support: the key ensures precise cold centering and positional accuracy, while the radial play in the perpendicular direction allows thermal expansion. This asymmetric design simultaneously solves both the centering and expansion compensation requirements.
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 solution enables reliable operation at temperatures up to 1300°C with reduced fragility and deformation, lower power requirements, and simplified manufacturing, while maintaining the external geometry and reducing the risk of 'heat buckles' and deviation.
Implementation Method 1
due to the differential thermal expansions between the shaft and the shroud, specific means must be provided either to limit the expansion of the shaft, or to compensate for these differential expansions
Implementation Method 2
the external geometry of which does not vary under the effect of high temperatures, in particular greater than 1000° C., and/or during rapid changes. of temperature
Data Source
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AI summary
The invention relates to a roller (100) for a high-temperature annealing line, comprising: a cylindrical casing (120) made from a composite material, and an axial support element (170) made from a metal material and having a spindle (130; 140) at at least one of the ends thereof. The roller further includes at least first and second keys (150, 155) attached to the axial support element (170) and arranged respectively in first and second passage openings (122, 123) provided in the casing (120). The first key (150) is mounted so as to bear against a first circumferential bearing surface (1221) of the first passage opening (122), while the second key (155) is mounted against a second circumferential bearing surface (1232) of the second passage opening (123) opposite the first circumferential bearing surface (1221) of the first passage opening (122) along a circumferential path (Sa). The first key (150) is mounted so as to bear against the second longitudinal bearing surface (1224) of the first passage opening (122), while the second key (155) is mounted against the first longitudinal bearing surface (1233) of the second passage opening (123) opposite the second longitudinal bearing surface (1224) of the first passage opening (122) along an axial path (Sa).