Tread Winding Pattern Calculation for Tire Geometry

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Solution Overview

Problem

Conventional tread production methods for vehicle tires face challenges in accurately reproducing the target geometry of the tread cross-section due to material deformation, temperature, and pressure, leading to imprecise filling and limited optimization of strip distribution, especially with spiral winding, which results in uneven material distribution and the inability to account for air inclusions.

Innovation Solution

An electronic data processing device calculates a winding pattern using an evolution algorithm that considers the properties of the rubber material strip, including dimensions and deformation properties, to generate tire-specific winding programs that optimize the filling of the target geometry, compensating for spiral effects and minimizing air pockets, thereby ensuring precise geometry reproduction and harmonious material distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If stripwinding is used to construct treads, then material distribution can be optimized, but the spiral effect causes imprecise filling of the target geometry

Engineering Contradiction:

Improvefilling precision of target geometryVSAvoidspiral effect

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The invention calculates and determines the optimal winding pattern before the actual winding process. By pre-calculating the winding path, overlap areas, and strip distribution using computer algorithms, the system compensates for the spiral effect and ensures precise filling of the target geometry, transforming the harmful spiral effect into a controllable parameter.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses computer-based calculation and simulation to predict the winding result, including the spiral effect, and adjusts the winding pattern accordingly. This feedback mechanism allows optimization of strip distribution and compensation for geometric deviations caused by spiral winding, achieving precise geometry reproduction.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If manual winding patterns are set, then customization is possible, but the process is extremely time-consuming

Engineering Contradiction:

Improvecustomization capabilityVSAvoidmanufacturing speed

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The invention replaces manual pattern setting with an automated computer-based calculation system. The electronic data processing device automatically determines optimal winding patterns based on input parameters such as target geometry, strip properties, and winding conditions, eliminating time-consuming manual operations while maintaining full customization capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system allows flexible adjustment of various parameters including strip width, overlap area, winding tension, and target geometry without requiring manual reconfiguration. By changing these parameters in the calculation software, different winding patterns can be quickly generated and optimized for specific applications, maintaining adaptability while dramatically improving productivity.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If extruded tread strips are pressed onto the belt, then tread application is simple, but material deformation leads to thickening in sidewall areas

Engineering Contradiction:

Improvetread application simplicityVSAvoidcross-sectional geometry accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The invention pre-calculates the winding pattern to account for expected material deformation during and after winding. By determining the optimal strip distribution and overlap areas in advance, the system compensates for deformation effects, ensuring that the final cured tread achieves the precise target cross-sectional geometry without unwanted thickening in sidewall areas.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3939776B1Method for detecting a winding pattern for a tread winding and system for producing tyres

Publication Date: 2023.04.12 CONTINENTAL REIFEN DEUTSCHLAND GMBH

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AI summary

The invention relates to a method for determining a winding pattern (18, 18a-18d) for a tread winding (16) of a tire blank (10) to be vulcanized, which can be produced by winding a rubber material strip (14), comprising the step of: calculating a winding pattern (18, 18a-18d) that at least partially fills a target geometry (12) of a tread cross-section by means of an electronic data processing device, wherein the electronic data processing device calculates the winding pattern (18, 18a-18d) taking into account cross-sectional information on the target geometry (12) of the tread cross-section and material strip information on properties of the rubber material strip (14), wherein the electronic data processing device calculates the winding pattern (18,18a-18d) solves a packing problem concerning the filling of the target geometry (12) of the tread cross-section by the tread winding (16) using a calculation algorithm.