Compagnie Generale Des Etablissements Michelin

Eric Colin

Benoît Renaux

Pierre Morisot

Elisabeth Faucheux

Emmanuel Clement

Thibault Rapenne

Cedric Chauvet

Gaëtan Davayat

Lucas Lauby

Natacha Pironneau

Pascal Chavarot

Cédric Chauvet

A ply () comprises metallic monofilaments (&#x2033;). Each monofilament (') of a first group has a positive torsional elastic deformation in a first direction about its main axis (G). Each monofilament (&#x2033;) of a second group has a negative torsional elastic deformation in a second direction about its main axis (G). The absolute value of the torsional elastic deformation C of each monofilament (&#x2033;) is such that |C|&#x2264;6 turns per ten metres. The mean S of the torsional elastic deformations of the monofilaments (&#x2033;) of the ply () is such that &#x2212;0.25 turn per ten metres&#x2264;S&#x2264;+0.25 turn per ten metres. The monofilaments (&#x2033;) are arranged next to one another so as to alternate one or more monofilaments (&#x2032;) of the first group with one or more monofilaments (&#x2033;) of the second group.

Straight ply and angle ply comprising metallic monofilaments

The method for the heat treatment of a steel reinforcing element (F) for a tire comprises a transformation of the steel microstructure and in which the temperature of the reinforcing element (F) is reduced during the transformation of the steel microstructure by simultaneously extracting heat from the reinforcing element (F) and supplying heat to the reinforcing element (F).

Method for the heat treatment of a steel reinforcement element for tires

A method is provided for manufacturing a multistrand cable having a 1&#xd7;N structure and including a single layer of N strands wound in a helix. Each strand includes an internal layer of M internal threads and an external layer of P external threads. The method includes a step of individually assembling each of the N strands, during which, in chronological order, the M internal threads are wound, the P external threads are wound, and the M internal threads and the P external threads are elongated such that a structural elongation associated with the P external threads of each strand is greater than or equal to 0.05%. The method further includes a step of collectively assembling the N strands, during which the N strands are wound to form the cable.

Multi-strand cable of 1&#xd7;N structure for protective reinforcement of a tire

A method for the heat treatment of a steel reinforcing element (F) for a tire, comprises a step of reducing the temperature of the reinforcing element by continuous cooling: from an initial temperature of the austenite range, to a final temperature of the ferrite-pearlite range, passing through at least one transformation range of the steel, the transformation range(s) being distinct from the bainite range. The temperature reduction step comprises a transformation (C, C) from the austenitic microstructure to the ferritic-pearlitic microstructure. The temperature of the reinforcing element is strictly decreasing during the reduction step. The mean rate of temperature reduction during the transformation (C, C) of the steel microstructure is greater than or equal to 30&#xb0; C.&#xb7;sand less than or equal to 110&#xb0; C.&#xb7;s.

Method for heat treatment with continuous cooling of a steel reinforcement element for tires

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Clermont-Ferrand, France

Eric Colin