Process for manufacturing a track and stripping device
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-045/14
B29C-047/02
출원번호
US-0345733
(2003-01-16)
등록번호
US-7276196
(2007-10-02)
우선권정보
FR-00 09701(2000-07-24)
발명자
/ 주소
Menard,Gilbert
Gauthier,Gilbert
출원인 / 주소
Michelin Recherche et Technique S.A.
대리인 / 주소
Buchanan Ingersoll & Rooney
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A process for manufacturing a track formed from a circumferentially continuous belt made of elastomeric material and including an inner surface and an outer surface. The inner surface is provided with a plurality of drive blocks uniformly arranged on the circumference. The process includes a step in
A process for manufacturing a track formed from a circumferentially continuous belt made of elastomeric material and including an inner surface and an outer surface. The inner surface is provided with a plurality of drive blocks uniformly arranged on the circumference. The process includes a step in which a cylindrical inner mold formed by first and second cylindrical die-halves is assembled, the two die-halves being movable relative to each other in an axial direction to come into contact with each other at a joint surface. The inner mold includes a radially external laying surface provided with a plurality of uniformly spaced cavities for molding the drive blocks, each cavity being delimited in the axial direction by respective side walls of the first and second die halves. The joint surface of the two die-halves is axially closer to one side wall than to the other side wall. A device for stripping the track from the inner and outer molds is provided.
대표청구항▼
What is claimed is: 1. A process for manufacturing a track formed from a circumferentially continuous belt made of elastomeric material comprising at least one reinforcement armature whose reinforcements, in the form of wires or cables, are arranged parallel to each other and are substantially alig
What is claimed is: 1. A process for manufacturing a track formed from a circumferentially continuous belt made of elastomeric material comprising at least one reinforcement armature whose reinforcements, in the form of wires or cables, are arranged parallel to each other and are substantially aligned with the circumference of the track, the belt having an inner surface and an outer surface, the outer surface being provided with a tread design formed from components in relief intended to come into contact with the ground, the inner surface being provided with a plurality of drive blocks uniformly arranged on the circumference, the process comprising the steps of: (a) assembling an inner mold formed by first and second coaxial cylindrical die-halves, said two die-halves being able to be moved relative to each other in the axial direction to come into contact with each other along a joint surface and to form a laying surface radially external to the inner mold intended for molding the radially internal surface of the track, said laying surface being provided with a plurality of uniformly spaced cavities for molding the drive blocks of the track, each cavity being delimited in the axial direction by first and second side walls, the first side wall belonging to the first die-half and the second side wall belonging to the second die-halve, said joint surface of the two die-halves being, on the laying surface, axially closer to the first side wall than to the second side wall; (b) filling the cavities with at least one suitable elastomer blend to form the drive blocks; (c) forming the belt by laying at least one elastomer blend and at least one reinforcement armature on the inner mold and radially external to the drive blocks to ensure contact between the belt blend and the block blend; (d) laying the track tread blend radially external to the belt to form a track blank; (e) transferring the track blank carried by the inner mold to an outer mold formed by a plurality of sectors, said sectors having, in the molding position, a radially internal molding surface to mold the track tread design; (f) closing the outer mold by radially bringing the sectors of the outer mold towards the axis of rotation, to mold and vulcanize the track; (g) after molding and vulcanizing, radially opening the sectors of the outer mold; (h) transferring the inner mold carrying the molded and vulcanized track to a stripping device; (i) axially immobilizing the first of the die-halves of the inner mold and moving the second of the die-halves in the axial direction to distance it axially from the immobilized first die-half until completely separated, with the track remaining attached to the second die-half; and (j) axially immobilizing the track and moving the second die-half axially so as to strip out the track by sliding it relative to the second die-half. 2. The process for manufacturing a track according to claim 1, wherein the distance between the joint surface and a midplane MM' axially dividing each cavity into two substantially equal parts is greater than half the distance between said midplane and the first side walls of the cavities on the first die-half. 3. The process for manufacturing a track according to claim 2, wherein the joint surface is tangential to the first side walls of the cavities on the first die-half. 4. The process for manufacturing a track according to claim 1, wherein at least one of the die-halves forming the inner mold comprises suitable clamping means and elastic repulsion means between the die-halves to ensure both the mechanical behavior of the assembly of the die-halves, and the taking up of a suitable, uniform play between the die-halves during the molding and vulcanization as soon as a preselected molding pressure threshold is reached by the blend inside the cavities. 5. The process for manufacturing a track according to claim 1, wherein each sector of the outer mold comprises a plurality of components that are individually mobile, along a direction of approach to or of distancing from the axis of the mold at least on a final molding course, said components also being mobile with respect to each other at least while they are moving along said course. 6. The process for manufacturing a track according to claim 5, wherein the outer mold comprises means for providing an elastic repulsion between the components of the sectors, so as to ensure that said components all remain equidistant to each other. 7. The process for manufacturing a track according to claim 1, wherein the filling of the cavities of the inner mold is performed by extrusion or injection molding of a blend inside said cavities before laying the other constituents of the track blank. 8. The process for manufacturing a track according to claim 7, wherein the station for extrusion or injection molding of the blend in the cavities is combined with the stripping station, such that the manufacture of a new track blank follows the stripping of a molded and vulcanized track, so as to optimize the cycle time of the process. 9. The process for manufacturing a track according to claim 1, wherein the two die-halves of the inner mold are each provided with at least one channel for circulating a fluid at a temperature to vulcanize the elastomer blends, at least one channel being provided radially under the cavities, the temperature of the fluid circulating in said one channel being different from the temperature of the fluids circulating in the other channels.
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