Tire Sidewall Turn-Up Arms Independent Control
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Solution Overview
Problem
Existing tire blank rolling up installations face challenges in applying uniform pressure and controlling the movement of arms, leading to suboptimal attachment of the rubber layer and potential deformation of the sidewalls, which affects the quality and reproducibility of the tire manufacturing process.
Innovation Solution
The method involves independently controlling longitudinal and radial movements of roll-up arms using speed setpoints to apply a predetermined force, allowing for precise control of the rubber layer application and adaptation to different tire profiles, including those with 'omega' profiles, using electric actuators for improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pneumatic cylinder is used to drive the arms in translation and rotation, then the arms can be actuated, but the applied pressure breaks down into application force and rotation force, requiring much greater force than needed which can laminate and damage the rubber layer
Solution Approach 1:
The drive system is segmented into two independent actuators: one for longitudinal movement and one for radial movement. This separation allows independent control of each degree of freedom, preventing the force breakdown issue where a single pneumatic cylinder's pressure must be split between translation and rotation, thereby avoiding excessive force application that damages the rubber layer.
Solution Approach 2:
The system transitions from static pneumatic pressure application to dynamic electric actuator control. The electric actuators enable precise, programmable movement profiles with controlled speeds and positions, allowing the arms to move smoothly without sudden force applications that would laminate the rubber layer, while maintaining consistent attachment quality throughout the process.
2Ease of operation
If a pneumatic cylinder is used to drive the arms, then the arms can be actuated, but the system cannot take into account the deformations of the sides of the blank, reducing the quality of the roll-up
Solution Approach 1:
The system incorporates feedback through programmable control that can detect and respond to blank deformations. The electric actuators allow for real-time adjustment of arm positions and movement speeds based on feedback signals, enabling the system to compensate for sidewall deformations and maintain consistent roll-up quality throughout the process.
Solution Approach 2:
The static pneumatic system is replaced with a dynamic electric actuation system that can adapt its movement parameters in real-time. The programmable control enables the arms to adjust their speed, position, and force application based on the actual state of the blank, accommodating deformations that occur during the roll-up process and maintaining high manufacturing precision.
3Speed
If the arms are driven by a pneumatic cylinder, then the arms can move, but the application of force by the arms on the sidewalls can cause the sidewalls to deform towards the inside of the blank, modifying the pressure applied during rolling up
Solution Approach 1:
The drive system is segmented into two independent electric actuators, one for longitudinal movement and one for radial movement. This allows independent optimization of each movement dimension: longitudinal speed can be maximized for productivity while radial force application is precisely controlled to maintain pressure uniformity, preventing sidewall deformation.
Solution Approach 2:
The system transitions from static pneumatic pressure to dynamic electric actuator control. The programmable speed profiles enable the arms to move at optimized speeds while applying controlled forces that prevent sidewall deformation. The system can adjust its dynamics in real-time to maintain uniform pressure distribution throughout the roll-up process.
Data Source
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AI summary
The invention relates to methods for controlling a tyre blank turn-up method, in which the longitudinal and radial movements of turn-up arms (20) are controlled, independently of one another, relative to a main axis (8) of the blank (3) in order to apply a gum element on at least one sidewall (5) of the blank (3). The radial movement of the arms is controlled using a speed set-value.