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WO2021094033A1 - Retournement de produits en caoutchouc sans fils conducteurs - Google Patents

Retournement de produits en caoutchouc sans fils conducteurs Download PDF

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Publication number
WO2021094033A1
WO2021094033A1 PCT/EP2020/077623 EP2020077623W WO2021094033A1 WO 2021094033 A1 WO2021094033 A1 WO 2021094033A1 EP 2020077623 W EP2020077623 W EP 2020077623W WO 2021094033 A1 WO2021094033 A1 WO 2021094033A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
turn
series
ret
arms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2020/077623
Other languages
English (en)
Inventor
Thomas Guy
Clément NAGODE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Compagnie Generale des Etablissements Michelin SCA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Generale des Etablissements Michelin SCA filed Critical Compagnie Generale des Etablissements Michelin SCA
Publication of WO2021094033A1 publication Critical patent/WO2021094033A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • B29D2030/3221—Folding over means, e.g. bladders or rigid arms
    • B29D2030/3264—Folding over means, e.g. bladders or rigid arms using radially expandable, contractible mechanical means, e.g. circumferentially spaced arms, spring rollers, cages

Definitions

  • the present invention is directed to an assembly drum and a building system incorporating such a drum for effecting processes for turning up rubber products in the field of tire manufacturing.
  • a tire type device is intended to equip any type of vehicle, including, without limitation, passenger vehicles, heavy-duty vehicles, two-wheeled vehicles, agricultural vehicles, engineering vehicles and aircraft. It is understood that a tire in this sense includes a crown with a tread designed to contact the ground via a tread surface.
  • the tread of a tire is provided with a tread pattern having notably tread elements or elementary blocks delimited by various main, longitudinal or circumferential, transverse or even oblique grooves, the elementary blocks being able to additionally include various incisions or finer sipes.
  • the grooves constitute channels intended to evacuate water when driving on wet ground.
  • assemblies that include an elastic structure and a load-bearing structure for which the manufacture requires a special use of internal reinforcements (see, for example, the assemblies disclosed in the Applicant’s publications WO2016/116490 and WO2018/130782).
  • the characteristics of these assemblies can be easily described but are much less obvious to master during their realization because of the absence of a beadwire.
  • One of the main difficulties encountered during the manufacture of these objects is the control of the different lengths of material during the turn-up of the chamber closure (or “turn-up"), as well as the centering of this chamber under the top block.
  • a poor control of the lengths of the flank sheet leads to problems of molding, top centering or folds, depending on whether there is overlength or underlength.
  • the disclosed invention In order to control the manufacture of a closed tire (without taking into account the installation of the internal reinforcement), it is necessary to control the length of the sidewalls with headless turn-up. It is also necessary to control the centering of the blank when the crown is set.
  • the disclosed invention combines a "fictitious retractable beadwire" with a mechanical turn-up system, thus presenting a turn-up architecture to include a superimposition in the center of one end of a product.
  • the disclosed invention also anticipates embodiments that combine these elements to maintain constant control over the products, even during an overlap operation (or “overlap” in English).
  • the invention is directed to an assembly drum for a building system that effects turn up of rubber products, the drum including a shaft rotating relative to a building frame on which the drum is mounted so as to rotate around a central axis, the drum being in two halves separable from a ferrule to create two sides of the drum in an assembly that includes a reference and an anti-reference, the drum further including a cylindrical laying generatrix having a circumferential surface on which the rubber products are assembled during posing of the rubber products, characterized in that the drum includes:
  • each turn-up subassembly disposed at each end of a corresponding drum and being radially expandable with respect to the circumferential surface of the drum, each turn-up subassembly having corresponding turn-up arms that are distributed in a series (RET A ) closest to a ferrule center plane, and in a series (RET B ), each arm of a series having a predetermined length with a corresponding free end;
  • a lifting ring in communication with the second annular actuator of the mobile sleeve and in communication also with the two series (RET A , RET B ) of arms to allow the lifting of the two series of arms by the actuation of the second annular actuator.
  • the drum also includes a mobile clutch arranged on each side of the drum, each mobile clutch engaging the mobile sleeve during a turn-up process.
  • the drum also includes a central screw with opposite pitches that allows a symmetrical displacement of the mobile clutches with respect to the central axis.
  • the drum also includes a spring(s) or roller(s) at each corresponding free end to engage rubber products posed on the circumferential surface of the drum during a turn-up process.
  • the drum also includes a stop bar(s) that is slidably mounted in the lifting ring and maintained in a standby position by a spring between turn-up cycles.
  • the invention is also directed to a building system that effects the turn-up of rubber products, wherein the building system includes:
  • the building system also includes:
  • the moving pallet includes a shoe with a body having means for mounting on the top transfer ring, the body of the shoe extending between two opposite ends and having an upper surface on which at least one rubber product is posed, and an opposite lower surface with a curvature that engages the circumferential surface of the drum, the body of the shoe having a predetermined length and a predetermined width.
  • the building system further includes a retraction system for retracting the moving pallets acting as a fictitious beadwire, the retraction system having a pre-loaded tension spring for retracting the moving pallet.
  • the invention furthermore is directed to a retraction process effected by the disclosed building system during a retraction cycle, the process including the following steps:
  • RET A , RET B a step of raising the respective turn-up up arms of the series (RET A , RET B ), this step including a step of lowering the mobile pallets in contact with the rubber products previously placed on the circumferential surface of the drum;
  • the process is effected in an iterative manner.
  • Figure 1 represents a cross-sectional view of an embodiment of an assembly drum that is part of a building system for effecting the turn-up of rubber products.
  • Figure 2 represents an enlarged view of turn-up subassemblies of the assembly drum of Figure 1.
  • Figure 3 represents a perspective view of an embodiment of a mobile pallet to serve as a fictitious beadwire of the building system incorporating the drum of Figure 1.
  • Figures 4 to 8 represent steps of an embodiment of a turn-up process of the invention.
  • Figure 1 represents an embodiment of an assembly drum (also called “building drum” or “drum”) 100 that effects a process of turning up rubber products (called “product” or “products”).
  • product include fabrics and plies (including reinforcing plies sandwiched between rubber layers) that are prepared flat on a cylindrical support.
  • the invention facilitates the manufacture of a variety of tire types incorporating multiple products without changing the drum.
  • the drum 100 is mounted on a known building frame (not shown) that also includes mechanical means capable of rotating the drum around a central axis X-X' (e.g., driven by a drum flange coupled thereto).
  • the drum 100 is designed in two separable halves 100', 100" with respect to a support ring (or “ferrule") 102. This separation is achieved via an expandable hub (or “hub”) 112 attached to the end of the top form.
  • the hub faces the drum 100 and can pass through a top transfer ring ("ATS") known to effect separation.
  • the two sides 100', 100" the of drum 100 are differentiated by the position of a barcode, called the reference (R) side when assembled.
  • the opposite side is called the anti-reference (AR) side.
  • the drum 100 includes a cylindrical laying generatrix (or “generatrix”) with a circumferential receiving surface (or “surface”) 100a upon which products are assembled (e.g., during a building cycle).
  • the generatrix is cylindrical, allowing total coverage of the product posing area by two known placement and centering subassemblies 104, 106.
  • the almost continuous cylindrical geometry of the generatrix allows an easy posing of the products (winding on a cylinder), as well as a better workability of the different bonds to be turned-up.
  • the drum 100 also includes a central screw 108 with opposite pitches that allow the symmetrical movement of the two mobile clutches ER and EAR.
  • the central screw 108 being with opposite pitches, allows the symmetrical displacement of the two mobile clutches E R and EAR, SO that a shaft 110 serves as a tool holder.
  • the choice is made to clutch either on a turn up subassembly 114, 116, or on a placement and centering subassembly 104, 106. This has the main advantage of allowing precise control of the speed and position of the different subassemblies by using only one motorized motion input. Independent or combined movements can thus be realized.
  • the drum 100 also includes turn-up subassemblies 114, 116 that effect turn-up cycles of the products deposited on the surface 100a of the drum 100.
  • Each turn-up subassembly 114, 116 is located at one end of a corresponding drum 100, and each is radially expandable with respect to the axis X-X'. It is understood that the turn-up subassemblies 114, 116 all have the same components and function in the same manner.
  • Each turn-up subassembly 114, 116 includes a mobile sleeve 118 in which the mobile clutch ER engages.
  • the mobile sleeve 118 is slidably mounted on the shaft 110 along a path 110a defined between a first stop 110a' and a second stop 110a" (see Figure 4).
  • the mobile sleeve 118 is set in sliding motion during product turn-up processes.
  • Each turn-up subassembly 114, 116 includes a corresponding set of turn-up arms.
  • the turn-up arms of a subassembly are divided into two series RET A and RET B as shown in Figure 2 (the two series RET A and RET B are also shown during operation of the turn-up process of the invention in Figures 4 to 8).
  • Each arm A, B has a predetermined length with a corresponding free end Aio, Bio (see Figure 2 and Figures 4 to 8).
  • Each free end Aio, Bio can carry a corresponding engagement means that engages one or more products posed on the circumferential surface 100a of the drum 100.
  • the engagement means includes one or more springs or rollers 50, 50' corresponding to each respective free end Aio, Bio. It is understood that the springs or rollers 50, 50' may be replaced by equivalent tool(s) (e.g., membrane(s), fmger(s), articulated device(s) and/or known equivalent device(s)). In the description, reference is made to spring(s) 50, 50' and this includes springs and their equivalents.
  • equivalent tool(s) e.g., membrane(s), fmger(s), articulated device(s) and/or known equivalent device(s)
  • the series RET A including arms A is closest to the mid-plane of the ferrule 102, and it pivots directly on the mobile sleeve 118.
  • the series RET B with arms B pivots on a first annular actuator 120 mounted on the mobile sleeve 118, allowing the arms B to be moved backwards for product closure (for example, the closure of a ply of a sheet as shown in Figure 8 by the closed ply P400 of sheet 400).
  • a second annular actuator 122 is mounted on the mobile sleeve 118 together with a lifting ring 124, allowing a sliding movement of the lifting ring.
  • the lifting ring 124 is not directly attached to the turn-up arms, but it allows the turn-up arms to be lifted by contact.
  • one or more stop bars 126 are slid into the lifting ring 124 (see Figures 4 to 8).
  • a spring return (not shown) maintains the stop bar 126 in a standby position between turn-up cycles.
  • the drum 100 is part of a positive building system.
  • a "positive" system is one in which there is no loss of reference between the start and the end of an operation (e.g., a process or a turn-up cycle), and the combination of a series of actions of a given system ensures that an accurate and repeatable result is achieved.
  • the product must be precisely posed and bonded in order to have at least one set of peripheral contacts at all times (and thus prevent any risk of uncontrolled slipping).
  • the drum 100 therefore includes two series of turn-up arms in order to remain positive during retraction of a fictitious beadwire in the form of a moving pallet.
  • the product In the manufacture of tires where no beadwire is available (for example, the manufacture of closed objects), the product must be turned up in relation to another object to determine the turned-up length. Once this length is known (and since the final ply must be empty), the area must be cleared without losing reference, hence the retractable aspect of the fictitious beadwire.
  • the building system including the drum 100 includes one or more movable pallets that replace pallets attached to the ATS (not shown). It is these moving pallets that act as the fictitious beadwire.
  • an embodiment of a moving pallet of the building system includes a shoe 200 with a body 202 that facilitates standard mounting on the ATS (these modifications to the ATS do not disturb its normal operation).
  • the body 202 of the shoe 200 which extends between two opposite ends, has an upper surface 202' on which one or more products are posed, and an opposite lower surface 202" with a curvature that engages the surface 100a of the drum 100 (see Figures 4 to 8).
  • the body 202 of the shoe 200 has a known size, including a known length (represented by the opposite ends of the body 202) and a known width (represented by a predetermined width of the body 202).
  • a passive retraction system for the retraction of the moving pallets acting as a fictitious beadwire.
  • the retraction system uses the potential energy of a pre-loaded return spring 210 to retract the moving pallet (in this case, the shoe 200).
  • a trigger 211 maintains them in the extended position.
  • the trigger 211 includes an actuation point 211a and a stop notch 211b that engages the body of shoe 202 between cycles of turning up products deposited on the surface 100a of the drum 100. This engagement is ensured by a return spring 21 lc of the trigger 211.
  • RET A of turn-up arms on this trigger causes the retraction of the shoe 200 (i.e., the fictitious beadwire).
  • a re-arming notch 212 is provided on the lower surface 202" of each shoe 200, in which pins provided on the surface 100a of the drum 100 can be engaged.
  • the stop bar 126 upon starting a product turn-up process from a starting position, the stop bar 126 is held in the standby position. In this starting position, the moving pallets are positioned in contact with the products 400 previously posed on the drum surface (represented by the shoes 200). This starting position is taken by all turn-up assemblies 114, 116 between turn-up processes.
  • the process includes a step of raising the turn-up arms A, B of the respective series RET A , RET B (see arrow I in Fig. 5).
  • This step includes a step of setting the annular actuator 122 in sliding motion with respect to the mobile sleeve 118 (see arrow II of Figure 5).
  • the step of setting the annular actuator 122 in sliding motion causes the lifting ring 124 to move.
  • the two series RET A , RET B are pivoted to effect the elevation of the turn-up arms A, B.
  • an adjustment of the relative position between the drum and the ATS is possible to adjust the turn-up length of the product.
  • the process further includes a step of advancing the turn-up arms A, B which, by radial (spring) return, turn over the fictitious beadwire (the shoe 200) to control the length of a tire part (for example, the length of the shoe 200 that corresponds to the length of a sidewall of the tire being produced)(see arrow III of Figure 6).
  • This fictitious shape will have to "disappear" during the turn-up to leave it empty.
  • the combination of the movement and the radial advance of the springs 50, 50' controls the length of the turned-up product.
  • This step includes a step of moving the mobile sleeve 118 along the path 110a in the direction of the first stop 110a' (see arrow IV of Figure 6).
  • This step is realized by the action of the central screw 108 on a nut of the mobile clutch E R (it is understood that the movement of the mobile clutch EAR is performed in the same manner).
  • the turn-up arms A, B are advanced to effect the termination of the winding of the products 400 around the shoe 200 during this step.
  • the process also includes a step of retracting the fictitious beadwire (the shoe 200) to leave the turn-up of the product 400 empty (see arrow V in Fig. 7). It is noted that the two series RET A , RET B of arms A, B are in contact with a non-moving part 500 during the retraction of the shoe 200 acting as a fictitious beadwire, so that the products 400 are maintained.
  • the process includes a final turn-up step during which the turn-up arms B (furthest from the center of the ferrule 102) are retracted until they close the turn-up of the products by bonding (see arrow VI of Fig. 8).
  • the stop bar 126 allows the second actuator to execute an additional displacement of the lifting ring 124, still in contact with the series RET A arms that slightly rise at the end of the stroke (see arrow VII of Figure 8).
  • the stop bar 126 returns to the standby position by means of a spring return when the second actuator 122 has returned to a starting position (as shown in Figure 4).
  • the series RET A , RET B are at the initial lift height for a complete removal of the turn-up arms A, B without crushing the freshly executed closed fold P400.
  • the moving pallets i.e., the shoes 200
  • the process can be restarted.
  • the process is carried out iteratively.
  • the turn-up can be performed successively in a synchronized or non-synchronized manner (regardless of the presence or absence of an overlap in the architecture).
  • mobile pallets the shoes 200
  • the mobile pallets that allow use of a continuous cylindrical generator during the building phase also have a centering function.
  • one or more turned-up products are produced that have the desired qualities for tires incorporating these turned-up products. These qualities are ensured while also preserving other performance qualities of the tires incorporating the turn-up products emanating from the disclosed system and the drum 100.
  • a turn-up process (and/or a turn-up cycle including a turn-up process of the invention) performed by the system including the drum 100 can be done by PLC control and can include pre-programmed management information.
  • a process setting can be associated with the parameters of the drum 100 and also with the properties of the products posed on the surface 100a of the drum 100.
  • a monitoring system could be set up. At least part of the monitoring system can be provided in a portable device such as a mobile network device (e.g., cell phone, laptop, network connected portable device(s) (including “augmented reality” and/or “virtual reality” devices, network connected wearable clothing and/or any combination and/or equivalent)).
  • a mobile network device e.g., cell phone, laptop, network connected portable device(s) (including “augmented reality” and/or “virtual reality” devices, network connected wearable clothing and/or any combination and/or equivalent)
  • the drum 100 may receive voice commands or other audio data representing, for example, a request for the current status of a turn-up process.
  • a generated response may be represented in an audible, visual, tactile (e.g., using a haptic interface) and/or virtual or augmented manner.
  • the drum 100 can facilitate its training (or the training of a system that incorporates the drum 100) to recognize representative values of the turn-up products (for example, parameters of a length of a shoe 200) and to make a comparison with target values.
  • This step may include the step of training the system to recognize non-equivalences between the compared values.
  • Each training step includes a classification generated by means of machine learning. This classification may include, but is not limited to, the parameters of the rubber mixtures incorporated into the products, the duration of the turn-up cycles and the values expected at the end of a turn-up cycle in progress.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)

Abstract

L'invention concerne un tambour d'assemblage (100) pour un système de construction pour le retournement de produits en caoutchouc. Le tambour comprend un sous-ensemble de retournement (114, 116) disposé à chaque extrémité du tambour (100) et ayant des bras d'enroulement correspondants (A, B) qui sont divisés en une série (RETA) et une série (RETB). Chaque bras respectif (A, B) d'une série correspondante (RETA, RETB) comprend une longueur prédéterminée avec une extrémité libre correspondante (A10, B10). Un premier et un second actionneur annulaire (120, 122) sont disposés sur un manchon mobile (118), avec la série (RETA) qui est directement pivotée sur le manchon mobile (118) et la série (RETB) qui est pivotée sur le premier actionneur annulaire (120) embarqué sur le manchon mobile (118). Un anneau de levage (124), qui est agencé en communication avec le second actionneur annulaire (122), est en communication avec les deux séries de bras pour permettre le levage des bras.
PCT/EP2020/077623 2019-11-15 2020-10-02 Retournement de produits en caoutchouc sans fils conducteurs Ceased WO2021094033A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1912748 2019-11-15
FRFR1912748 2019-11-15

Publications (1)

Publication Number Publication Date
WO2021094033A1 true WO2021094033A1 (fr) 2021-05-20

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PCT/EP2020/077623 Ceased WO2021094033A1 (fr) 2019-11-15 2020-10-02 Retournement de produits en caoutchouc sans fils conducteurs

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB878837A (en) * 1958-11-11 1961-10-04 William Warren Triggs C B E Tyre building machine and method of building tyres
SU1305054A2 (ru) * 1985-12-16 1987-04-23 Научно-исследовательский институт крупногабаритных шин Механизм дл обработки борта к станку дл сборки покрышек пневматических шин
EP0451625A1 (fr) * 1990-04-11 1991-10-16 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Ensemble comportant un pneumatique torique et procédé de fabrication dudit ensemble
SU1696314A2 (ru) * 1985-07-01 1991-12-07 Всесоюзный Научно-Исследовательский И Конструкторский Институт По Оборудованию Для Шинной Промышленности Механизм дл обработки борта к станку дл сборки покрышек пневматических шин
WO1998052740A1 (fr) * 1997-05-23 1998-11-26 Vmi Epe Holland B.V. Tambour servant a fabriquer des pneus et comportant un dispositif de recouvrement
WO2014209110A1 (fr) * 2013-06-28 2014-12-31 Vmi Holland B.V. Tambour de conformation de pneumatique avec mécanisme de retournement
WO2016116490A1 (fr) 2015-01-22 2016-07-28 Compagnie Generale Des Etablissements Michelin Dispositif de type pneumatique pour vehicule
WO2018130782A1 (fr) 2017-01-12 2018-07-19 Compagnie Generale Des Etablissements Michelin Assemblage comprenant une structure élastique et une structure porteuse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB878837A (en) * 1958-11-11 1961-10-04 William Warren Triggs C B E Tyre building machine and method of building tyres
SU1696314A2 (ru) * 1985-07-01 1991-12-07 Всесоюзный Научно-Исследовательский И Конструкторский Институт По Оборудованию Для Шинной Промышленности Механизм дл обработки борта к станку дл сборки покрышек пневматических шин
SU1305054A2 (ru) * 1985-12-16 1987-04-23 Научно-исследовательский институт крупногабаритных шин Механизм дл обработки борта к станку дл сборки покрышек пневматических шин
EP0451625A1 (fr) * 1990-04-11 1991-10-16 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Ensemble comportant un pneumatique torique et procédé de fabrication dudit ensemble
WO1998052740A1 (fr) * 1997-05-23 1998-11-26 Vmi Epe Holland B.V. Tambour servant a fabriquer des pneus et comportant un dispositif de recouvrement
WO2014209110A1 (fr) * 2013-06-28 2014-12-31 Vmi Holland B.V. Tambour de conformation de pneumatique avec mécanisme de retournement
WO2016116490A1 (fr) 2015-01-22 2016-07-28 Compagnie Generale Des Etablissements Michelin Dispositif de type pneumatique pour vehicule
WO2018130782A1 (fr) 2017-01-12 2018-07-19 Compagnie Generale Des Etablissements Michelin Assemblage comprenant une structure élastique et une structure porteuse

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