Tyre Elastic Element Laying Profile Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for laying down elastic elements on forming drums during tyre production fail to maintain precise tension control, especially during transient phases, affecting the geometric profile and overall performance of the tyre.
Innovation Solution
Adjusting the rotation speed of a control roller based on the forming drum's speed and desired elongation of the elastic element allows for precise control of the laying profile, ensuring accurate tension maintenance throughout the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a control roller is used to lay down the elastic element, then the laying process can be performed, but the tension control is imprecise during transient phases
Solution Approach 1:
The control roller's rotation speed is made dynamically adjustable during the laying process. The system transitions from a static speed setup to a dynamic one where the rotation speed varies based on real-time parameters such as drum speed and desired elongation, enabling precise tension control during transient phases
Solution Approach 2:
The system implements feedback control by continuously monitoring the laying speed and desired elongation parameters, then adjusting the control roller's rotation speed accordingly. This closed-loop approach ensures that tension deviations during transient phases are detected and corrected in real-time
2Productivity
If the forming drum speed varies, then productivity can be adjusted, but the tension control of the elastic element becomes inaccurate
Solution Approach 1:
The system establishes a dynamic relationship between drum speed and control roller speed. As the drum speed varies to adjust productivity, the control roller speed automatically adapts through the control system, which calculates the appropriate speed based on the drum speed and desired elongation parameters
Solution Approach 2:
The control system changes the rotation speed parameter of the control roller in response to changes in drum speed. By adjusting this parameter dynamically, the system maintains accurate tension control across varying productivity levels
3Manufacturing precision
If the control roller rotation speed is adjusted based on drum speed and elongation, then tension control precision is improved, but the system complexity increases
Solution Approach 1:
The control system is designed to perform multiple functions: it monitors drum speed, calculates desired elongation effects, determines appropriate control roller speed, and adjusts the roller accordingly. This multi-functional approach consolidates control tasks into a single integrated system rather than requiring separate mechanisms for each function
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 accurate tension control of the elastic element during tyre production, minimizing differences between theoretical and actual laying profiles, even during starting and final transients, and maintains precise tension values across varying laying speeds.
Implementation Method 1
percent elongation to be applied to the elastic element; adjusting as a function of said first and second parameters, a rotation speed of a control roller positioned upstream of said forming drum and having a radially external surface at least partly in engagement with said elastic element
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Method of laying down at least one elastic element in a process for producing tyres for vehicles, said method comprising the following steps: determining a first parameter representative of a laying speed at which at least one elastic element is laid down around a tyre forming drum; determining a second parameter representative of a percent elongation to be applied to said elastic element; adjusting, as a function of said first and second parameters, a rotation speed of a control roller positioned upstream of said forming drum and having a radially external surface at least partly in engagement with said elastic element for controlling the laying profile of said at least one elastic element. Also described is a process for producing tyres for vehicles and an apparatus for carrying out said laying method.