Run-flat Tyre Winding Speed Control
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Solution Overview
Problem
The quality of tires produced depends on the correct winding of continuous elongated elements on the forming drum, which is influenced by longitudinal stresses during deposition, requiring precise control of tension or compression to ensure uniformity and radial symmetry.
Innovation Solution
Controlling the advancing speed of the transport surface and the linear speed of the radially external surface of the forming drum allows for precise adjustment of longitudinal deformation, ensuring correct joining and geometric uniformity of the continuous elongated elements, with the ratio of these speeds being crucial in achieving the desired tension or compression characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the continuous elongated element is wound on the forming drum without precise speed control, then the winding process is simple and fast, but the longitudinal uniformity and radial symmetry of the tyre component deteriorate
Solution Approach 1:
The patent implements dynamic speed control by making the transport surface speed variable and adjustable during the winding process. The control system modifies the advancing speed of the transport surface based on real-time requirements to maintain optimal tension and compression forces, thereby achieving precise longitudinal uniformity and radial symmetry in the wound tyre component.
Solution Approach 2:
The patent changes the speed parameter of the transport surface from a constant value to a variable parameter that can be adjusted during operation. By modifying the advancing speed of the transport surface relative to the forming drum rotation speed, the system optimizes the longitudinal stresses applied to the continuous elongated element, ensuring uniform winding quality and geometric precision.
2Manufacturing precision
If the ratio between transport surface speed and drum surface speed is not precisely controlled, then the winding operation is simpler and faster, but the joining quality and geometric uniformity of the continuous elongated element deteriorate
Solution Approach 1:
The patent implements a feedback control mechanism where the actual speeds of the transport surface and forming drum are continuously monitored, and the ratio between them is adjusted to maintain optimal winding conditions. This feedback system ensures that the continuous elongated element is wound with precise tension control, achieving high joining quality and geometric uniformity while maintaining efficient production rates.
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 ensures high radial symmetry and uniformity in the finished tire by accurately managing longitudinal stresses during the winding process, correcting length errors and maintaining precise centring and positioning on the drum.
Implementation Method 1
During the passage between the transport surface and the radially external surface to the forming drum, successive portions of the section come to contact with the radially external surface and with the transport surface. The transport surface adheres to a first face, preferably lower, of each portion of the section. Thus, the first face advances together with the transport surface with a null relative speed with respect to said transport surface. The radially external surface adheres to a second face, opposite to the first and preferably upper, of the same section. Thus, the second face advances together with the radially external surface with a relative null speed with respect to said radially external surface.
Data Source
AI summary
In a process and in an apparatus for manufacturing tyres for vehicle wheels, the deposition of a continuous elongated element of a tyre being formed on a forming drum comprises: providing a section of a continuous elongated element (5, 12) of elastomeric material; making opposite faces (30, 31) of the section simultaneously adhere to a transport surface and a surface radially external (13a) to a forming drum (13), respectively; adjusting a linear speed (V1) of the radially external surface (13a) and an advancing speed (V2) of the transport surface (23) for adjusting the length of the section while passing between such surfaces (23, 13a).