Abstract:
A plant (2) for building tyres comprises a system for managing initial components (3); a system for managing the manufacturing of semi-finished products (4) starting from one or more initial components; a system for managing the building of a green tyre (5) starting from one or more semi-finished products; a system for managing the curing of said green tyre (6). The logical set of a control unit (8) for the plant (2) and/or of one or more from among control units (8a-8e) for the management systems (3-6) and/or of a automatic visual control system (7) is programmed for controlling at least two parameters, assigning to each of these a quality index (I), discarding a tyre being processed when a quality index (I) corresponding to said discard level (S) is assigned to at least one of said parameters and feedbacking the control result of at least one parameter in order to verify the quality index (I) of the parameters.
Abstract:
A method for controlling uniformity in tire manufacturing includes the steps of measuring the radial runout of an uncured tire carcass, modeling the radial force variation contribution of the carcass from the radial runout measurement, measuring the thickness of the tire tread, modeling the mass imbalance of the tread from the tread thickness measurement, forming a green tire by loading the tread onto the carcass at an angle whereby the radial force variation contribution of the carcass is opposed to the tread mass imbalance determined from the tread mass imbalance model, and placing the green tire in a curing press at an angle which minimizes the radial force variation or mass imbalance of the green tire.
Abstract:
A tire manufacturing method includes a method for optimizing the uniformity of a tire by reducing the after cure radial force variation. The after cure radial force variation vector is modeled as a vector sum of each of the vectors representing contributions arising from the tire building steps - the "tire room effect vector" and a vector representing contributions arising from the vulcanization and uniformity measurement steps - the "curing room effect vector." In further detail, both the tire room and curing room effect vectors can be further decomposed into sub-vectors representing each radial force variation contribution for which a measurable indicator is available. For a series of tires, the method obtains such measurements as the before cure radial runout (RRO) at one or more stages of the building sequence, measurements of loading angles on the tire building equipment, and measurements made during vulcanization process.
Abstract:
A method for controlling uniformity in tires manufacturing, includes the steps of building at least one tire according to a series of process steps, measuring vector quantities for a uniformity characteristics at high speed and uniformity characteristics at low speed, determining a phase angle relationship for the vector quantities for the uniformity characteristics at low speed that results in a selected vector quantity for the uniformity characteristic at high speed, and modifying at least one process step so that a vector quantity for at least one of the uniformity characteristics at low speed is adjusted toward the phase angle relationship, wherein a modified of process steps results, and, building at least one additional tire according to the modified series of process steps.
Abstract:
A system and related method for improving tire uniformity includes providing a number (n) of test tires manufactured in a known order and identifying at least one candidate cyclic process effect with a corresponding frequency of introduction (f) . A given uniformity parameter, such as radial or lateral run-out, balance, mass variation, radial lateral or tangential force variation, is measured for each tire in the test set, and measured data points are combined into a concatenated composite waveform. At least one process harmonic associated with each identified cyclic process effect is separated from the tire harmonics, for example, by Fourier transformation with identification of the process harmonics as positive integer multiples of the m th harmonic of the measured uniformity parameter where m=n/f . Once the process harmonics are extracted, filtered uniformity measurements can be provided or new tires can be built with the process effect minimized.
Abstract translation:用于提高轮胎均匀性的系统和相关方法包括提供以已知顺序制造的数量(n)个测试轮胎,并且以相应的介绍频率(f)识别至少一个候选循环过程效果。 对于测试组中的每个轮胎测量给定的均匀性参数,例如径向或侧向跳动,平衡,质量变化,径向横向或切向力变化,并且测量的数据点被组合成级联复合波形。 与每个识别的循环过程效应相关联的至少一个过程谐波例如通过傅里叶变换与过程谐波的识别作为测量的均匀性参数的第m次谐波的正整数倍分离,其中m = n / f 。 一旦提取过程谐波,就可以提供滤波均匀度测量,或者可以以最小化过程效应构建新的轮胎。