Reverse-Bending Roller Layout for Multi-Plane Wire Curvature Control
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Solution Overview
Problem
Existing metal wire straightening devices are complex to adjust, with numerous parameters to set, making it difficult to achieve consistent results across various wire diameters, and they can only control curvature in a single plane, limiting their applicability and efficiency.
Innovation Solution
A straightening apparatus with a sequence of rollers where the diameter increases monotonically from the first to the exit roller, with a meandering multiple reverse bending path and adjustable roller positions, allowing for controlled curvature without relying on indentation, and enabling operation across a wide range of wire diameters with simplified threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional straighteners with equal diameter rollers and indentation adjustment are used, then curvature control in a single plane is achieved, but the device complexity increases and adjustment becomes difficult
Solution Approach 1:
The invention changes the physical parameter of roller diameter from equal to progressively increasing sizes. This parameter change eliminates the need for indentation adjustment while maintaining curvature control capability, thereby reducing device complexity without sacrificing manufacturing precision
Solution Approach 2:
Each roller is given a specific local quality (diameter size) that corresponds to its position in the sequence. The first roller has a smaller diameter and subsequent rollers have progressively larger diameters, creating a gradient structure that naturally controls curvature through the bending sequence rather than through adjustable indentation parameters
2Ease of operation
If traditional straighteners with equal diameter rollers are used, then threading is simplified, but adaptability to different wire diameters decreases
Solution Approach 1:
The gradient roller diameter design creates a universal apparatus that can handle multiple wire diameters and material types. The progressive diameter increase provides a natural adaptation mechanism that works across different wire sizes without requiring reconfiguration, achieving multi-functionality while maintaining ease of threading
3Manufacturing precision
If multiple rollers with indentation adjustment are used, then curvature control is achieved, but the number of parameters to set increases
Solution Approach 1:
The invention replaces the indentation parameter with roller diameter as the controlling parameter. By changing from equal to progressively increasing diameters, the system achieves cast control through a fixed geometric progression rather than through multiple adjustable parameters, thereby improving ease of operation while maintaining manufacturing precision
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 apparatus simplifies the adjustment process, reduces the number of parameters to set, and allows for effective curvature control in multiple planes, enhancing the straightening and shaping of metal wires, improving their mechanical properties and fatigue life.
Implementation Method 1
Metal wires allow—due their elastic plastic behaviour—forming by stretching, bending and torqueing in almost any desired shape
Implementation Method 2
a first roller, a number of intermediate rollers and an exit roller that form a numerable sequence of rollers... The rollers are freely rotating and are not intentionally driven or restrained
Implementation Method 3
Another use of devices imparting multiple reverse bends is to induce desirable residual stresses in the outer shell of the wire. Indeed by inducing more bending than is actually needed in order to shape the wire, compressive residual stresses can be induced in the outer shell of the wire. Compressive residual stresses prevent the propagation of cracks and therefore have advantageous effect on the fatigue life of metal wires
Implementation Method 4
Straighteners can also be used as 'flaw filters' in particular when combined with an axial tensile force. Due to the repeated bending and back bending of the wire any flaw due to a surface defect or an inclusion will lead to a rupture of the wire
Implementation Method 5
The result of the multiple reverse bends is that the yield strength of the wire is lowered. The yield strength is that stress at which the wire deviates from the linear Hooke behaviour in a stress-strain diagram. The yield stress is defined for a certain permanent elongation that is usually set to 2 parts in 1000 or 0.2% permanent elongation after removal of the load. A lowering of the yield stress makes the bead wire easier to deform into a coil
Data Source
AI summary
An apparatus for treating metal wire by multiple reverse bending and associated methods for using the apparatus are disclosed. The first roller has a first roller diameter, is followed by N−1 intermediate rollers with intermediate roller diameters and ends with an exit roller with an exit roller diameter. The exit roller is larger than the first roller and any one roller in the sequence of rollers has a roller diameter that is not smaller than the preceding roller in the sequence. The progressively larger diameters impose a well-controlled, gradually decreasing curvature to the wire resulting in a cast controlled wire. By folding the wire path together, a compact arrangement is obtained accommodating the increasingly larger rollers. A method to operate the apparatus is also described that allows for an easy adjustment of the apparatus in function of wire thickness.