EP0125348B1 - Machine for reprofiling rail heads - Google Patents

Machine for reprofiling rail heads Download PDF

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Publication number
EP0125348B1
EP0125348B1 EP83200699A EP83200699A EP0125348B1 EP 0125348 B1 EP0125348 B1 EP 0125348B1 EP 83200699 A EP83200699 A EP 83200699A EP 83200699 A EP83200699 A EP 83200699A EP 0125348 B1 EP0125348 B1 EP 0125348B1
Authority
EP
European Patent Office
Prior art keywords
grinding
plane
rail
theoretical
machine
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.)
Expired
Application number
EP83200699A
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German (de)
French (fr)
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EP0125348A1 (en
Inventor
Frédy Scheuchzer
Fritz Bühler
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.)
LES FILS D'AUGUSTE SCHEUCHZER SA
Original Assignee
LES FILS D'AUGUSTE SCHEUCHZER SA
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 LES FILS D'AUGUSTE SCHEUCHZER SA filed Critical LES FILS D'AUGUSTE SCHEUCHZER SA
Priority to EP83200699A priority Critical patent/EP0125348B1/en
Priority to DE8383200699T priority patent/DE3366980D1/en
Priority to AT83200699T priority patent/ATE22949T1/en
Priority to US06/610,383 priority patent/US4621460A/en
Priority to ES532531A priority patent/ES8504300A1/en
Priority to JP59096749A priority patent/JPS603302A/en
Priority to CA000454403A priority patent/CA1241561A/en
Priority to DD84263084A priority patent/DD219230A5/en
Publication of EP0125348A1 publication Critical patent/EP0125348A1/en
Application granted granted Critical
Publication of EP0125348B1 publication Critical patent/EP0125348B1/en
Expired legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B31/00—Working rails, sleepers, baseplates, or the like, in or on the line; Machines, tools, or auxiliary devices specially designed therefor
    • E01B31/02—Working rail or other metal track components on the spot
    • E01B31/12—Removing metal from rails, rail joints, or baseplates, e.g. for deburring welds, reconditioning worn rails
    • E01B31/17—Removing metal from rails, rail joints, or baseplates, e.g. for deburring welds, reconditioning worn rails by grinding

Definitions

  • the present invention relates to a machine for reprofiling the head of the rails comprising one or more grinding heads per row of rails, means for positioning and advancing the cutting tool or tools on the head, the grinding head or heads being arranged around the mushroom so as to create one or more facets determined by the theoretical tangents along one, respectively several, generating the theoretical profile of the mushroom.
  • a rail head grinding vehicle is equipped with two groups of grinding heads per rail row. Each group includes four grinding heads forming a grinding shoe suspended from the vehicle chassis. Two pads facing each other, one per row of rails, are connected by their middle part to a connecting element. Each shoe is angularly displaceable in a transverse plane of the track in order to allow the orientation of the grinding heads to be modified and thus to be able to correct the whole of the fungus in several passages.
  • each grinding head is provided with means allowing its individual pivoting with respect to the other grinding wheels of the grinding shoe and parallel to a transverse plane of the track, thus increasing the possibilities of approaching the profile of the mushroom.
  • Means for changing the inclination of the pads and / or grinding heads step by step are provided.
  • a jack and two drawbars articulated to a console fixed under the vehicle chassis ensure the suspension of each grinding pad, the jack ensuring on the one hand the lifting of the pad for walking high and on the other hand the adjustment of the support pressure of the skate on the line of rails.
  • Each grinding head can be individually adjusted in height with respect to the grinding pad by means of a slide.
  • the possibilities of adjusting the inclination of the pad as well as the adjustment of the inclination of each grinding head relative to the pad allowing an optimal approach to the theoretical curve of the profile of the mushroom.
  • the set of grinding heads forming the same shoe are applied integrally to the rail without having the possibility of individually controlling the advance of each grinding wheel, which can, of course, be positioned in height relative to the other grinding wheels. This positioning takes place by means of a screw controlled by a handwheel before the start of grinding and cannot be changed during the advance of the machine.
  • no means for controlling the positioning of the pad is described except the lifting cylinder which is also used for adjusting the bearing force of the pad on the rail.
  • the skate system is satisfactory if the generators are relatively tight.
  • the ripples are eliminated as a function of the length of the pad, that is to say the extreme distance between the grinding heads.
  • the work control is difficult and the grindstones tend to copy the undulations on the burrs, because the shoe is no longer guided.
  • CH-A-614.476 also describes a machine for grinding the running surface of the rails comprising a device for controlling the advance of the controlled cutting tool according to the dimensions of the corrugation and the wear of the 'tool, but not according to the theoretical tangent to the profile of the fungus.
  • the present invention aims to overcome these drawbacks by proposing a machine avoiding grinding of the profile of the fungus beyond the theoretical tangent to the desired profile (theoretical).
  • each grinding head comprises a member located in the plane of the facet or in a parallel plane detecting the arrival of the cutting tool in the plane of the theoretical tangent and controlling the blocking of the means for positioning and advancing the cutting tool against the fungus as soon as the plane of the theoretical tangent is attent.
  • the advantages obtained thanks to the invention consist in that the cutting tool cannot advance beyond the plane of the predetermined theoretical tangent which avoids too deep grinding or partial grinding and makes it possible to obtain an optimal approach of the profile.
  • a tilting mechanical stop can be placed facing the cutting tool and at the end of its tilting, under the action of the advance of the tool, the advance of the grinding head is blocked, the position of the stop being such that at the end of its tilting the active face of the cutting tool has reached the plane of the theoretical tangent.
  • the stop acts directly or indirectly through a proximity sensor, on a hydraulic or pneumatic valve of the supply circuit of a positioning cylinder.
  • a pneumatic sensor can be used, the air jet of which is placed on the theoretical tangent and as soon as the cutting tool arrives in front of the orifice through which the air exits it disturbs the air jet, this disturbance being detected the blocking valve of the positioning cylinder is actuated.
  • the grinding heads are mainly used grouped and connected to a guided grinding base on the one hand in the vertical median plane of the rail, that is to say the longitudinal plane which passes through the axis of symmetry of the transverse profile of the rail, and on the other hand in height by pressing on the surface of the rails, for example by means of rollers or pads.
  • the grinding heads depending on this base are inclined at different angles in a plane transverse to the rails, that is to say perpendicular to the longitudinal direction of the rails.
  • the angle of inclination of each head can be modified, either step by step between two predetermined limit values, or take one or the other of two predetermined values.
  • Each grinding head (fig. 2, 3) comprises a frame 1 provided with two pairs of orifices 27a, 27b by which is fixed to a grinding base installed on a grinding vehicle, an electric motor 2 carrying the tool section in the form of a grinding wheel 3 driven by means of the spindle 4 and suspended from the chassis 1 by four pendulums 5, 6, 7, 8 forming two suspension parallelograms 5, 6 and 7, 8.
  • the pendulums 5 and 7 are articulated on one side on an axis 9 secured to the chassis 1 and on the other hand on the motor cage 2 by articulations 5a respectively 7a.
  • the pendulums 6, 8 which are in fact levers of the first kind, are articulated by an intermediate point to an axis 10 secured to the chassis 1 and by one of their ends 6a respectively 8a to the motor cage 2.
  • the second end of the lever 6 applies or abuts the rod 11 of a jack 12, preferably hydraulic, secured to the chassis 1, while the second end of the lever 8 is articulated to the rod 13 of a jack 14, preferably pneumatic, suspended by a hinge 15 to a projection 1a of the chassis 1.
  • the jack 12 is the jack for positioning the grinding wheel while the jack 14 is the grinding jack, that is to say the one which regulates the bearing force of the tool on the rail.
  • a lever bent 17 from the inside of the angle so that its end 18 is disposed facing the peripheral part of the active surface of the grinding wheel 3.
  • This end 18 is provided with a lug 19 of a material having a greater abrasion resistance than that of the grinding wheel 3.
  • the second end 20 of the lever 17 has an approximately perpendicular projection to the arm of the adjacent lever which is subjected to the force of a spring 21 which causes the lever 17 to tilt so that the lug 19 is in the rest position in the plane A (dotted line) held against a stopper by illustrated.
  • valve 22 can be replaced by a proximity detector detecting the approach of the end 20 of the lever and controlling by an electro-hydraulic or electro-pneumatic circuit the blocking of the supply to the cylinder of the jack 12.
  • a proximity detector 24, in particular a pneumatic detector instead of the tilting lever 17, it is possible to use a proximity detector 24, in particular a pneumatic detector.
  • the pneumatic detector 24 sends a jet of air through a nozzle compressed parallel to the active surface of the grinding wheel 3, the nozzle being placed exactly on the theoretical tangent T.
  • the lateral surface of grinding wheel 3 approaches the nozzle disturbs the air jet and this disturbance being detected by an electro-hydraulic circuit or electro-pneumatic acts as previously on the positioning cylinder 12.
  • FIG. 4 there is shown quite schematically a grinding base 25 comprising three referenced grinding heads 26, a grinding head 26 corresponds to a unit shown in FIGS. 1 and 2.
  • the three grinding heads 26 are secured to each other by rods 27 'while the heads situated at the ends are fixed to the base 25 by guide rods 27 fixed to the orifices 27a and 27b of their respective chassis 1 (FIG. 2 + 3).
  • Each grinding head is fixed at a different inclination from the others so in a single pass the rail head is reprofiled according to three generators G1, G2, G3 (fig. 1) by creating tangential facets containing the corresponding theoretical tangents T1, T2 respectively , T3. If the theoretical tangents are not reached in a single pass, a second or even several passages are carried out until the desired profile is obtained.
  • the frame 28 of the base 25 rests on two legs 29, 30 provided with two pads 31 on the rail rolling surface 23.
  • the pads 31 can be replaced by rollers 35.
  • Cylinders like those referenced 33 in FIG. 6, guide the base 25 in the horizontal plane. by pressing rollers 34 against the inner side surface of the mushroom.
  • the grinding heads 26 can either be mounted on the frame 28 with an invariable inclination with respect to each other (fig. 4) and in this case there are two possibilities 1) the angle of inclination of the heads cannot be modified, 2) one can modify the angle of inclination of heads in block, or one can modify the inclination of each head independently of the others are between two limit values, as shown in FIG. 5 which will be described later.
  • FIG. 6 we have shown the means by which the angle of inclination of a grinding head or of multiple heads can be varied, as shown in FIG. 4, mounted on a grinding base. It is a front view corresponding to FIG. 5, certain parts having been omitted.
  • the base shown in the figure 5 presents as a difference from that of Figure 4 the fact that the heads are mounted so that one can change their angle of inclination independently of one another.
  • the shoe 31 has been replaced by a roller 35.
  • the same references followed by a zero have been used for the elements of FIG. 5 corresponding to FIG. 4.
  • the chassis 280 rests on the running surface of the rail 23 by rollers 35 and it is guided horizontally by jacks 33 and rollers 340.
  • the chassis 280 is composed of two tubular beams 36 and 37 fitted with sheets having, viewed from the front, a triangular section.
  • the rods 270 are mounted on a pendulum 38 (in dotted lines) suspended from the frame 280 of the grinding base 250 by a jack 39.
  • the two rods 270 are guided in two circular grooves 40, 41 corresponding to lines 40a and 41a of FIG. 7.
  • the grooves 40 and 41 are arcs of a circle centered at point 0'1 which is the center of curvature of an arc of a circle of the profile of the delimited mushroom by the two tangents T'l and T'2 forming an angle B'1 which corresponds to the angle between the two extreme positions of the grinding head the angle being of the order for example of 10 °.
  • the grooves 40 and 41 may correspond to one of the arcs A1, A2, A3 in FIG. 7 of the lines 40a and 41a a or to the whole of the arc A1 + A2 + A3.
  • the heads 26 must remain inside one of the arcs A1, A2 or A3 as mentioned above and in this case the grooves 40 and 41 correspond to a portion of the one of these arcs so that the heads remain respectively inside arcs A'1, A "1, A” '1 or A'2, A "2, A"' 3 or A'3, A " 3, A "'3.
  • the heads 26 being integral with one another the fixing rods 27 of the two heads 26 situated at the ends are guided in grooves 40 and 41 and supported by a pendulum 38 and a jack 39 as shown in FIG. 6.
  • each head 260 is suspended from the frame 280 of the base 250 by a device similar to that shown in Figure 6.
  • each head 260 is suspended by rods 270 collaborating with grooves which they are provided with plates 43, 44, 45, 46 fixed to the frame 280 as shown in FIG. 6.
  • Two plates which will be called 42 and 47 are fixed behind the legs 290 respectively 300 of the base 250.
  • the grooves of each pair of plates 42, 43 or 44, 45 or 46, 47 correspond respectively to one of the arcs A1, A2, A3 (fig. 7) or to all of the arcs A1 + A2 + A3.
  • the guide rods 270 are connected by pendulums 38 suspended and driven by jacks 39 not shown.
  • Changing the inclination of a grinding head (fig. 5) or of a set of heads (fig. 4) between two limit values can be achieved either by changing the inclination step by step, the drive being controlled for example by a motor, or by having the possibility of giving the inclination two determined values.
  • a base like that shown in FIG. 4 can be considered, the heads of which are respectively 70 °, 50 ° and 40 ° and after changing the angle using, for example , of the device of Figure 6 the respective inclination of the heads is 60 °, 40 ° and 30 °.
  • a grinding base can be composed of one or more grinding heads and in the case of a base with several heads the angle of inclination can either be modified as a block for all the heads or independently of one of the another, that is to say the heads are mounted fixed on the grinding base at a determined inclination.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Coating With Molten Metal (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

This machine comprises at least one grinding unit mounted to a grinding base. Each unit comprises a frame secured to the grinding base. The grinding wheel is driven by an electric motor, suspended from the frame by means of four rocker arms constituting two parallel-motion suspension systems. The lower rocker arms are levers of the first order and the grinding pressure is applied for one of the rocker arms by the piston rod of a hydraulic cylinder rigid with the frame and adapted to position the grinding wheel in relation to the rail, and for the other rocker arm by the piston rod of a pneumatic cylinder also rigid with the frame. This pneumatic cylinder determines the operating pressure of the grinding wheel on the rail. The operative face of the grinding wheel is parallel to the plane of the theoretical tangent to the rail profile. A right-angled lever is pivoted to a projection of the frame and provided at one end with a stud facing the grinding wheel. During the forward feed of the grinding wheel this stud moves from an inoperative position to the theoretical tangent and when this theoretical tangent is attained by the wheel the opposite end of the right-angled lever actuates a device for stopping and locking the feed of the grinding wheel by actuating the hydraulic positioning cylinder.

Description

La présente invention concerne une machine pour le reprofilage du champignon des rails comportant une ou plusieurs têtes de meulage par file de rails, des moyens de positionnement et d'avance du ou des outils de coupe sur le champignon, la ou les têtes de meulage étant disposées autour du champignon de sorte à créer une ou plusieurs facettes déterminées par les tangentes théoriquues le long d'une, respectivement plusieurs, génératrice du profil théorique du champignon.The present invention relates to a machine for reprofiling the head of the rails comprising one or more grinding heads per row of rails, means for positioning and advancing the cutting tool or tools on the head, the grinding head or heads being arranged around the mushroom so as to create one or more facets determined by the theoretical tangents along one, respectively several, generating the theoretical profile of the mushroom.

Pour reprofiler les rails de chemin de fer déformés par le trafic il faut d'une part éliminer les ondulations créées sur la surface de roulement et d'autre part enlever les bourrelets créés de part et d'autre du champignon. Pour effectuer le reprofilage de la surface de roulement on utilise des machines de meulage et des ébarbeuses pour enlever les bourrelets. Les ébarbeuses munies de meules inclinées enlèvent une quantité de matière à chaque passage en fonction de la force d'appui qui leur est appliquée.To reprofile the railway rails deformed by traffic, it is necessary on the one hand to eliminate the undulations created on the running surface and on the other hand to remove the beads created on either side of the mushroom. To reprofile the running surface, grinding machines and deburring machines are used to remove the beads. The trimmers with inclined grinding wheels remove a quantity of material at each pass depending on the bearing force applied to them.

Pour obtenir un reprofilage précis il faut guider et positionner la meule par rapport à l'axe du plan de roulement P1 (fig. 1) et à la face latérale intérieure P2 du rail de manière que la tangente théorique T au profil désiré (théorique) puisse être obtenue. Bien sûr pour le reprofilage complet du champignon on utilise plusieurs meules inclinées à des angles différents dans un plan transversal à la voie lesquelles doivente être guidées pour obtenir une multitude de facettes déterminant respectivement les tangentes théoriques T1, T2, T3, etc. le long des génératrices G1, G2, G3 etc. du champignon.To obtain a precise reprofiling it is necessary to guide and position the grinding wheel with respect to the axis of the running surface P1 (fig. 1) and to the inner lateral face P2 of the rail so that the theoretical tangent T to the desired profile (theoretical) can be obtained. Of course, for the complete reprofiling of the fungus, several grinding wheels are used which are inclined at different angles in a plane transverse to the track, which must be guided to obtain a multitude of facets respectively determining the theoretical tangents T1, T2, T3, etc. along generators G1, G2, G3 etc. of the fungus.

Une telle machine est décrite dans le CH-A-633.336. Un véhicule de rectification du champignon des rails est équipé de deux groupes de têtes de meulage par file de rails. Chaque groupe comprend quatre têtes de meulage formant un patin de meulage suspendu au châssis du véhicule. Deux patins se faisant face, un par file de rails, sont reliés par leur partie médiane à un élément de liaison. Chaque patin es déplaçable angulairement dans un plan transversal de la voie afin de permettre de modifier l'orientation des têtes de meulage et pouvoir ainsi rectifier l'ensemble du champignon en plusieurs passages. Selon une variante chaque tète de meulage est munie des moyens permettant son pivotement individuel par rapport aux autres meules du patin de meulage et parallèlement à un plan transversal de la voie, augmentant ainsi les possibilités d'approche du profil du champignon. Des moyens permettant le changement d'inclinaison des patins et/ou de têtes de meulage pas à pas sont prévus. Un vérin et deux timons articulés à une console fixée sous le châssis du véhicule assurent la suspension de chaque patin de meulage, le vérin assurant d'une part le relevage du patin pour la marche haut le pied et d'autre part le réglage de la pression d'appui du patin sur la file de rails. Chaque tête de meulage peut être réglée individuellement en hauteur par rapport au patin de meulage au moyen d'une coulisse.Such a machine is described in CH-A-633.336. A rail head grinding vehicle is equipped with two groups of grinding heads per rail row. Each group includes four grinding heads forming a grinding shoe suspended from the vehicle chassis. Two pads facing each other, one per row of rails, are connected by their middle part to a connecting element. Each shoe is angularly displaceable in a transverse plane of the track in order to allow the orientation of the grinding heads to be modified and thus to be able to correct the whole of the fungus in several passages. According to a variant each grinding head is provided with means allowing its individual pivoting with respect to the other grinding wheels of the grinding shoe and parallel to a transverse plane of the track, thus increasing the possibilities of approaching the profile of the mushroom. Means for changing the inclination of the pads and / or grinding heads step by step are provided. A jack and two drawbars articulated to a console fixed under the vehicle chassis ensure the suspension of each grinding pad, the jack ensuring on the one hand the lifting of the pad for walking high and on the other hand the adjustment of the support pressure of the skate on the line of rails. Each grinding head can be individually adjusted in height with respect to the grinding pad by means of a slide.

Les possibilités de réglage de l'inclinaison du patin ainsi que le réglage de l'inclinaison de chaque tête de meulage par rapport au patin permettant une approche optimale de la courbe théorique du profil du champignon. L'ensemble de têtes de meulage formant le même patin sont appliquées solidairement sur la rail sans avoir la possibilité de commander individuellement l'avance de chaque meule, qui peut, bien sûr, être positionnée en hauteur par rapport aux autres meules. Ce positionnement s'opère, au moyen d'une vis commandée par un volant avant le commencement du meulage et ne peut être modifié pendant l'avance de la machine. D'autre part, aucun moyen de contrôle de positionnement du patin n'est décrit sauf le vérin de levage qui sert également au réglage de la force d'appui du patin sur le rail. Le système de patins est satisfaisant si les génératrices sont relativement serrées. Dan ce cas, les ondulations sont éliminées en fonction de la longueur du patin, c'est-à-dire la distance extrême entre les têtes de meulage. Dans le cas où les génératrices sont écartées, le contrôle de travail s'avère difficile et les meules ont tendance à copier les ondulations sur les bavures, du fait que le patin n'est plus guidé.The possibilities of adjusting the inclination of the pad as well as the adjustment of the inclination of each grinding head relative to the pad allowing an optimal approach to the theoretical curve of the profile of the mushroom. The set of grinding heads forming the same shoe are applied integrally to the rail without having the possibility of individually controlling the advance of each grinding wheel, which can, of course, be positioned in height relative to the other grinding wheels. This positioning takes place by means of a screw controlled by a handwheel before the start of grinding and cannot be changed during the advance of the machine. On the other hand, no means for controlling the positioning of the pad is described except the lifting cylinder which is also used for adjusting the bearing force of the pad on the rail. The skate system is satisfactory if the generators are relatively tight. In this case, the ripples are eliminated as a function of the length of the pad, that is to say the extreme distance between the grinding heads. In the case where the generators are discarded, the work control is difficult and the grindstones tend to copy the undulations on the burrs, because the shoe is no longer guided.

Le CH-A-614.476 décrit également une machine de meulage de la surface de roulement des rails comportant un dispositif de commande de l'avance de l'outil de coupe asservi en fonction des dimensions de l'ondulation et de l'usure de l'outil, mais pas en fonction de la tangente théoriqie au profil du champignon.CH-A-614.476 also describes a machine for grinding the running surface of the rails comprising a device for controlling the advance of the controlled cutting tool according to the dimensions of the corrugation and the wear of the 'tool, but not according to the theoretical tangent to the profile of the fungus.

La présente invention a pour but de pallier ces inconvénients en proposant une machine évitant le meulage du profil du champignon au-delà de la tangente théorique au profil désiré (théorique).The present invention aims to overcome these drawbacks by proposing a machine avoiding grinding of the profile of the fungus beyond the theoretical tangent to the desired profile (theoretical).

La machine selon l'invention est caractérisée par le fait que chaque tête de meulage comporte un organe situé dans le plan de la facette ou dans un plan parallèle détectant l'arrivée de l'outil de coupe dans le plan de la tangente théorique et commandant le blocage des moyens de positionnement et d'avance de l'outil de coupe contre le champignon dès que le plan de la tangente théorique est attent.The machine according to the invention is characterized in that each grinding head comprises a member located in the plane of the facet or in a parallel plane detecting the arrival of the cutting tool in the plane of the theoretical tangent and controlling the blocking of the means for positioning and advancing the cutting tool against the fungus as soon as the plane of the theoretical tangent is attent.

D'autres formes de réalisation de l'invention sont indiquées dans les revendications dépendantes.Other embodiments of the invention are indicated in the dependent claims.

Les avantages obtenus grâce à l'invention consistent en ce que l'outil de coupe ne peut pas avancer au-delà du plan de la tangente théorique prédéterminée ce qui évite un meulage trop profond ou un meulage partiel et permet d'obtenir une approche optimale du profil. Une butée mécanique basculante peut être placée face à l'outil de coupe et à la fin de son basculement, sous l'action de l'avance de l'outil, l'avance de la tête de meulage est bloquée, la position de la butée étant telle qu'à la fin de son basculement la face active de l'outil de coupe a atteint le plan de la tangente théorique. La butée agit directement ou indirectment à travers un détecteur de proximité, sur' une valve hydraulique ou pneumatique du circuit d'alimentation d'un vérin de positionnement.The advantages obtained thanks to the invention consist in that the cutting tool cannot advance beyond the plane of the predetermined theoretical tangent which avoids too deep grinding or partial grinding and makes it possible to obtain an optimal approach of the profile. A tilting mechanical stop can be placed facing the cutting tool and at the end of its tilting, under the action of the advance of the tool, the advance of the grinding head is blocked, the position of the stop being such that at the end of its tilting the active face of the cutting tool has reached the plane of the theoretical tangent. The stop acts directly or indirectly through a proximity sensor, on a hydraulic or pneumatic valve of the supply circuit of a positioning cylinder.

Selon une variante, à la place d'une butée mécanique on peut utiliser un détecteur pneumatique, dont le jet d'air est placé sur la tangente théorique et dès que l'outil de coupe arrive devant l'orifice par lequel l'air sort il perturbe le jet d'air, cette perturbation étant détectée la valve de blocage du vérin de positionnement est actionnée.Alternatively, instead of a mechanical stop, a pneumatic sensor can be used, the air jet of which is placed on the theoretical tangent and as soon as the cutting tool arrives in front of the orifice through which the air exits it disturbs the air jet, this disturbance being detected the blocking valve of the positioning cylinder is actuated.

Les têtes de meulage sont surtout utilisées groupées et reliées à une base de meulage guidée d'une part dans la plan médian vertical rail c'est-à-dire le plan longitudinal qui passe par l'axe de symétrie du profil transversal du rail, et d'autre part en hauteur par l'appui sur la surface des rails, par exemple moyennant des galets ou des patins. Les têtes de meulage dépendant de cette base sont inclinées à des angles différents dans un plan transversal aux rails c'est-à-dire perpendiculaire à la direction longitudinale des rails.The grinding heads are mainly used grouped and connected to a guided grinding base on the one hand in the vertical median plane of the rail, that is to say the longitudinal plane which passes through the axis of symmetry of the transverse profile of the rail, and on the other hand in height by pressing on the surface of the rails, for example by means of rollers or pads. The grinding heads depending on this base are inclined at different angles in a plane transverse to the rails, that is to say perpendicular to the longitudinal direction of the rails.

Selon une variante l'angle d'inclinaison de chaque tête peut être modifié, soit pas à pas entre deux valeurs limites prédéterminées, soit prendre l'une ou l'autre de deux valeurs prédéterminées.According to a variant, the angle of inclination of each head can be modified, either step by step between two predetermined limit values, or take one or the other of two predetermined values.

Selon une autre variante la modification de l'angle d'inclinaison de chaque tête s'effectue indépendamment des autres têtes et selon encore une autre variante les têtes d'une base de meulage sont montées solidaires les unes aux autres de sorte que la modification de l'angle d'inclinaison s'opère simultanément pour toutes les têtes les angles relatifs entre les têtes restant toujours les mêmes.

  • La figure 1 représente une coupe transversale du champignon d'un rail déformé.
  • La figure 2 représente une vue de côté d'une tête de meulage selon la ligne II-II de la figure 3.
  • La figure 2a représente une variante d'un détail de la figure 2.
  • La figure 3 représente une vue de la tête de meulage selon la ligne III-III de la figure 2.
  • La figure 4 est une vue schématique latérale d'une base de meulage, les têtes montées solidaires les unes des autres.
  • La figure 5 est une vue analogue à la figure 4 d'une base de meulage dont l'inclinaison de chaque tête de meulage peut être modifiée indépendamment des autres.
  • La figure 6 est une vue schématique de front d'une base de meulage présentant le dispositif pour faire varier l'inclinaison, certaines parties ayant été omises pour plus de clarté.
  • La figure 7 est une vue partielle d'un profil de rail avec indication des centres et des rayons de courbure.
According to another variant, the modification of the angle of inclination of each head takes place independently of the other heads and according to yet another variant, the heads of a grinding base are mounted integral with one another so that the modification of the angle of inclination operates simultaneously for all the heads, the relative angles between the heads always remaining the same.
  • Figure 1 shows a cross section of the mushroom of a deformed rail.
  • FIG. 2 represents a side view of a grinding head according to line II-II of FIG. 3.
  • FIG. 2a represents a variant of a detail of FIG. 2.
  • FIG. 3 represents a view of the grinding head according to line III-III of FIG. 2.
  • Figure 4 is a schematic side view of a grinding base, the heads mounted integral with each other.
  • Figure 5 is a view similar to Figure 4 of a grinding base, the inclination of each grinding head can be changed independently of the others.
  • Figure 6 is a schematic front view of a grinding base showing the device for varying the inclination, some parts having been omitted for clarity.
  • Figure 7 is a partial view of a rail profile showing the centers and radii of curvature.

Chaque tête de meulage (fig. 2, 3) comporte un châssis 1 muni de deux paires d'orifices 27a, 27b par lesquels est fixé à une base de meulage installée sur un véhicule de meulage, un moteur électrique 2 portant l'outil de coupe sous la forme d'une meule 3 entraînée par l'intermédiaire de la broche 4 et suspendu au châssis 1 par quatre balanciers 5, 6, 7, 8 formant deux parallélogrammes de suspension 5, 6 et 7, 8. Les balanciers 5 et 7 sont articulés d'un côté sur un axe 9 solidaire du châssis 1 et d'autre part sur la cage du moteur 2 par des articulations 5a respectivement 7a. Les balanciers 6, 8 qui sont en fait des leviers de première espèce, sont articulés par un point intermédiaire à un axe 10 solidaire du châssis 1 et par une de leurs extrémités 6a respectivement 8a à la cage du moteur 2. La seconde extrémité du levier 6 s'applique ou bute à la tige 11 d'un vérin 12, de préférence hydraulique, solidaire du châssis 1, tandis que la seconde extrémité du levier 8 est articulée à la tige 13 d'un vérin 14, de préférence pneumatique, suspendu par une articulation 15 à une projection 1a du châssis 1. Le vérin 12 est le vérin de positionnement de la meule tandis que le vérin 14 est le vérin de meulage, c'est-à-dire celui qui règle la force d'appui de l'outil sur le rail. Bien entendu il serait possible de remplacer les deux vérins par un seul, néanmoins, pour un positionnement précis il vaut mieux utiliser un vérin hydraulique dont la fonction est uniquement le positionnement et non le réglage de la force d'appui.Each grinding head (fig. 2, 3) comprises a frame 1 provided with two pairs of orifices 27a, 27b by which is fixed to a grinding base installed on a grinding vehicle, an electric motor 2 carrying the tool section in the form of a grinding wheel 3 driven by means of the spindle 4 and suspended from the chassis 1 by four pendulums 5, 6, 7, 8 forming two suspension parallelograms 5, 6 and 7, 8. The pendulums 5 and 7 are articulated on one side on an axis 9 secured to the chassis 1 and on the other hand on the motor cage 2 by articulations 5a respectively 7a. The pendulums 6, 8 which are in fact levers of the first kind, are articulated by an intermediate point to an axis 10 secured to the chassis 1 and by one of their ends 6a respectively 8a to the motor cage 2. The second end of the lever 6 applies or abuts the rod 11 of a jack 12, preferably hydraulic, secured to the chassis 1, while the second end of the lever 8 is articulated to the rod 13 of a jack 14, preferably pneumatic, suspended by a hinge 15 to a projection 1a of the chassis 1. The jack 12 is the jack for positioning the grinding wheel while the jack 14 is the grinding jack, that is to say the one which regulates the bearing force of the tool on the rail. Of course it would be possible to replace the two cylinders with a single one, however, for precise positioning it is better to use a hydraulic cylinder whose function is only the positioning and not the adjustment of the pressing force.

Sur une projection 16 du châssis parallèle à la surface latérale de la meule 3 est articulé autour d'un axe 17a un levier coudé 17 par l'intérieur de l'angle, de sorte que son extrémité 18 soit disposée face à la partie périphérique de la surface active de la meule 3. Cette extrémité 18 est munie d'un ergot 19 d'un matériau présentant une résistance à l'abrasion plus grande que celui de la meule 3. La seconde extrémité 20 du levier 17 présente une projection approximativement perpendiculaire au bras du levier adjacent lequel est soumis à la force d'un ressort 21 qui fait basculer le levier 17 de sorte que l'ergot 19 soit en position de repos dans le plan A (en pointillé) tenu contre une butée par illustrée. La projection de l'extrémité 20, lorsque le levier poussé par la meule 3 est basculé dans le sens des aiguilles d'une montre, vient buter contre une valve 22 commandant le circuit hydraulique du cylindre 12 bloquant ainsi la course de la tige 11 et par conséquent l'avance de la meule 3. Entre le moment où la meule 3 entre en contact avec l'ergot 19 et le moment où la valve 22 est actionnée le meule avance d'une distance D. A la fin du basculement du levier 17 l'extrémité de l'ergot 19 et par conséquent la surface active de la meule 3 se trouve sur la tangente théorique T au profil théorique du champignon du rail 23.On a projection 16 of the frame parallel to the lateral surface of the grinding wheel 3 is articulated around an axis 17a a lever bent 17 from the inside of the angle, so that its end 18 is disposed facing the peripheral part of the active surface of the grinding wheel 3. This end 18 is provided with a lug 19 of a material having a greater abrasion resistance than that of the grinding wheel 3. The second end 20 of the lever 17 has an approximately perpendicular projection to the arm of the adjacent lever which is subjected to the force of a spring 21 which causes the lever 17 to tilt so that the lug 19 is in the rest position in the plane A (dotted line) held against a stopper by illustrated. The projection of the end 20, when the lever pushed by the grinding wheel 3 is tilted clockwise, abuts against a valve 22 controlling the hydraulic circuit of the cylinder 12 thus blocking the stroke of the rod 11 and consequently the advance of the grinding wheel 3. Between the moment when the grinding wheel 3 comes into contact with the lug 19 and the moment when the valve 22 is actuated the grinding wheel advances by a distance D. At the end of the tilting of the lever 17 the end of the lug 19 and consequently the active surface of the grinding wheel 3 is on the theoretical tangent T to the theoretical profile of the head of the rail 23.

Selon une variante la valve 22 peut être remplacée par un détecteur de proximité détectant l'approche de l'extrémité 20 du levier et commandant par un circuit électro-hydraulique ou électro-pneumatique le blocage de l'alimentation du cylindre du vérin 12.According to a variant, the valve 22 can be replaced by a proximity detector detecting the approach of the end 20 of the lever and controlling by an electro-hydraulic or electro-pneumatic circuit the blocking of the supply to the cylinder of the jack 12.

Selon une troisième variante illustrée à la figure 2a au lieu du levier basculant 17 on peut utiliser un détecteur de proximité 24, notamment un détecteur pneumatique. Dans ce cas, le détecteur pneumatique 24 envoie par une buse un jet d'air comprimé parallèlement à la surface active de la meule 3, la buse étant placée exactement sur la tangente théorique T. Lorsque la surface latérale de meule 3 approche de la buse perturbe le jet d'air et cette perturbation étant détectée un circuit électro-hydraulique ou électro-pneumatique agit comme précédemment sur le vérin de positionnement 12.According to a third variant illustrated in FIG. 2a, instead of the tilting lever 17, it is possible to use a proximity detector 24, in particular a pneumatic detector. In this case, the pneumatic detector 24 sends a jet of air through a nozzle compressed parallel to the active surface of the grinding wheel 3, the nozzle being placed exactly on the theoretical tangent T. When the lateral surface of grinding wheel 3 approaches the nozzle disturbs the air jet and this disturbance being detected by an electro-hydraulic circuit or electro-pneumatic acts as previously on the positioning cylinder 12.

Il est évident que le reprofilage des rails n'est pas rationnel avec une seule meule par file de rails. Habituellement on groupe plusieurs meules en les fixant à une inclinaison différente sur une base de meulage munie de patins ou de galets pour être guidée par rapport au plan médian rail.It is obvious that the reprofiling of the rails is not rational with a single wheel per row of rails. Usually several grinding wheels are grouped by fixing them at a different inclination on a grinding base provided with pads or rollers to be guided relative to the median rail plane.

A la figure 4, on a représenté tout à fait schématiquement une base de meulage 25 comprenant trois têtes de meulage réferencées 26, une tête de meulage 26 correspond à une unité représentée aux figures 1 et 2.In FIG. 4, there is shown quite schematically a grinding base 25 comprising three referenced grinding heads 26, a grinding head 26 corresponds to a unit shown in FIGS. 1 and 2.

Les trois têtes de meulage 26 sont solidaires les unes des autres par des tiges 27' tandis que les têtes situées aux extrémités sont fixées sur la base 25 par des tiges de guidage 27 fixées aux orifices 27a et 27b de leur châssis 1 respectif (Fig. 2+3). Chaque tête de meulage est fixée à une inclinaison différente des autres ainsi en un seul passage on reprofile le champignon de rail selon trois génératrices G1, G2, G3 (fig. 1) en créant des facettes tangentielles contenant respectivement les tangentes théoriques correspondantes T1, T2, T3. Si en un seul passage les tangentes théoriques ne sont pas atteintes on effectue un deuxième voire plusieurs passages jusqu'à ce que le profil voulu soit obtenu. Le châssis 28 de la base 25 repose par deux jambes 29, 30 munies de deux patins 31 sur la surface de roulement de rails 23. Elle est suspendue par deux vérins à double effet 32 assurant d'une part le retrait de la base 25 pour la marche haut le pied et d'autre part le contact permanent des patins 31 avec les rails lors du meulage. En outre comme représenté par la forme d'exécution selon les figures 5 et 6 les patins 31 peuvent être remplacés par des galets 35. Des vérins, comme ceux référencés 33 à la figure 6, assurent le guidage dans le plan horizontal de la base 25 en plaquant des galets 34 contre la surface latérale intérieure du champignon.The three grinding heads 26 are secured to each other by rods 27 'while the heads situated at the ends are fixed to the base 25 by guide rods 27 fixed to the orifices 27a and 27b of their respective chassis 1 (FIG. 2 + 3). Each grinding head is fixed at a different inclination from the others so in a single pass the rail head is reprofiled according to three generators G1, G2, G3 (fig. 1) by creating tangential facets containing the corresponding theoretical tangents T1, T2 respectively , T3. If the theoretical tangents are not reached in a single pass, a second or even several passages are carried out until the desired profile is obtained. The frame 28 of the base 25 rests on two legs 29, 30 provided with two pads 31 on the rail rolling surface 23. It is suspended by two double-acting cylinders 32 ensuring on the one hand the withdrawal of the base 25 for walking high and on the other hand the permanent contact of the pads 31 with the rails during grinding. In addition, as shown by the embodiment according to FIGS. 5 and 6, the pads 31 can be replaced by rollers 35. Cylinders, like those referenced 33 in FIG. 6, guide the base 25 in the horizontal plane. by pressing rollers 34 against the inner side surface of the mushroom.

Les têtes 26 de meulage peuvent soit être montées sur le châssis 28 avec une inclinaison invariable les unes par rapport aux autres (fig. 4) et dans ce cas on a deux possibilités 1) l'angle d'inclinaison de têtes ne peut pas être modifié, 2) on peut modifier l'angle d'inclinaison de têtes en bloc, soit on peut modifier l'inclinaison de chaque tète indépendamment des autres êtes entre deux valeurs limites, comme montré sur la figure 5 qui sera décrite plus tard.The grinding heads 26 can either be mounted on the frame 28 with an invariable inclination with respect to each other (fig. 4) and in this case there are two possibilities 1) the angle of inclination of the heads cannot be modified, 2) one can modify the angle of inclination of heads in block, or one can modify the inclination of each head independently of the others are between two limit values, as shown in FIG. 5 which will be described later.

Pour modifier l'angle d'inclinaison des têtes d'une base individuellement ou en bloc on doit de faire en prenant la précaution de placer la face active de l'outil de coupe parallèlement au plan tangent théorique au profil théorique du rail. Pour plus de clarté on a représenté à la figure 7 la moitié d'un profil théorique d'un rail. On peut considérer que la moitié du profil de la partie supérieure du champignon d'un rail 23 est obtenu par le raccordement de trois arcs de cercle dont la mesure angulaire est respectivement A1, A2, A3 centrés aux points C1, C2, C3. Pour obtenir un reprofilage correct du champignon une tête de meulage doit être guidée lors de la modification de l'angle d'inclinaison de sorte que deux points fixes de la tête définissant une droite parallèle à la broche d'entraînement de l'outil de coupe se déplacent sur deux trajectoires, homothétiques à la courbe du profil du champignon. Nous avons représenté sur la figure 7 ces trajectoires par les lignes en pointillé 40a et 41a sans respecter les proportions entre les dimensions du profil du rail 23 et la distance réelle aussi bien entre ces trajectoires qu'entre le rail 23 et les trajectoires 40a et 41a. Il est évident que la qualité de travail de profilage est proportionnelle au nombre de facettes créées. Théoriquement on peut utiliser une seule tête de meulage pour créer plusieurs facettes approchant le profil théorique du champignon. Dans ce cas l'inclinaison de la tête pourra être modifiée autant de fois que désiré d'une extrémité à l'autre du profil en prenant la précaution de guider deux points fixes de la tête comme mentionné précédemment sur deux trajectoires 40a et 41a. L'utilisation d'une seule tête n'étant pas rationnelle on utilise, comme déjà mentionné, des bases dont chacune est munie d'au moins deux têtes et dans le cas présent nous avons choisi à titre d'exemple une base à trois têtes (fig. 4 et 6). Les possibilités de modification de l'inclinaison de têtes d'une base sont les suivantes:

  • i) Si les têtes sont montées de sorte que l'inclinaison relative entre elles ne peut pas être modifiée, comme représenté à la figure 4, alors la variation de l'inclinaison de l'ensemble de têtes de la base est telle que les trois têtes restent toujours à l'intérieur de l'arc A1, ou A2 ou A3. Dans ce cas la première tête est disposée de sorte qu'elle reste à l'intérieur de l'arc A'1, respectivement A'2 respectivement A'3, la deuxième à l'intérieur de l'arc A"1, respectivement A"2, respectivement A"3 et la troisième à l'intérieur de l'arc A"'1, respectivement A"'2, respectivement A"'3.
  • ii) Si les têtes sont montées de sorte que l'inclinaison relative entre elles peut varier, comme représenté à la figure 5, alors deux possibilités existent:
  • a) La première tête reste à l'intérieur de l'arc A1, la deuxième à l'intérieur de l'arc A2 et la troisième à l'intérieur de l'arc A3, lors de la modification de leur inclinaison.
  • b) L'inclinaison de chaque tête peut varier à l'intérieur de la totalité de l'arc A1+A2+A3.
To modify the angle of inclination of the heads of a base individually or in a block, we must take the precaution of placing the active face of the cutting tool parallel to the theoretical tangent plane to the theoretical profile of the rail. For clarity, FIG. 7 shows half of a theoretical profile of a rail. We can consider that half of the profile of the upper part of the head of a rail 23 is obtained by the connection of three arcs of circle whose angular measurement is respectively A1, A2, A3 centered at the points C1, C2, C3. To obtain a correct reprofiling of the mushroom a grinding head must be guided when changing the angle of inclination so that two fixed points of the head defining a straight line parallel to the drive spindle of the cutting tool move on two trajectories, homothetic to the curve of the profile of the fungus. We have represented in FIG. 7 these trajectories by the dotted lines 40a and 41a without respecting the proportions between the dimensions of the profile of the rail 23 and the real distance both between these trajectories and between the rail 23 and the trajectories 40a and 41a . It is obvious that the quality of profiling work is proportional to the number of facets created. Theoretically we can use a single grinding head to create several facets approaching the theoretical profile of the fungus. In this case the inclination of the head can be changed as many times as desired from one end to the other of the profile, taking the precaution of guiding two fixed points of the head as mentioned previously on two trajectories 40a and 41a. The use of a single head is not rational we use, as already mentioned, bases each of which is provided with at least two heads and in the present case we have chosen by way of example a base with three heads (fig. 4 and 6). The possibilities to modify the inclination of the heads of a base are as follows:
  • i) If the heads are mounted so that the relative inclination between them cannot be modified, as shown in Figure 4, then the variation of the inclination of the set of heads of the base is such that the three heads always remain inside arc A1, or A2 or A3. In this case the first head is arranged so that it remains inside the arc A'1, respectively A'2 respectively A'3, the second inside the arc A "1, respectively A "2, respectively A" 3 and the third inside the arc A "'1, respectively A"' 2, respectively A "'3.
  • ii) If the heads are mounted so that the relative inclination between them can vary, as shown in Figure 5, then two possibilities exist:
  • a) The first head remains inside the arc A1, the second inside the arc A2 and the third inside the arc A3, when changing their inclination.
  • b) The inclination of each head can vary within the entire arc A1 + A2 + A3.

A la figure 6 nous avons représenté les moyens par lesquels on peut faire varier l'angle d'inclinaison d'une tête de meulage ou des têtes multiples, comme montré à la figure 4, montées sur une base de meulage. Il s'agit d'une vue de front correspondant à la figure 5 certaines parties ayant été omises. La base représentée à la figure 5 présente comme différence par rapport à celle de la figure 4 le fait que les têtes sont montées de sorte que l'on peut modifier leur angle d'inclinaison indépendamment l'une de l'autre. En outre le patin 31 a été remplacé par un galet 35. Les mêmes références suivies d'un zéro ont été utilisées pour les éléments de la figure 5 correspondant à la figure 4.In FIG. 6 we have shown the means by which the angle of inclination of a grinding head or of multiple heads can be varied, as shown in FIG. 4, mounted on a grinding base. It is a front view corresponding to FIG. 5, certain parts having been omitted. The base shown in the figure 5 presents as a difference from that of Figure 4 the fact that the heads are mounted so that one can change their angle of inclination independently of one another. In addition, the shoe 31 has been replaced by a roller 35. The same references followed by a zero have been used for the elements of FIG. 5 corresponding to FIG. 4.

Avant de décrire la fixation des têtes de meulage nous décrirons les moyens pour faire varier l'inclination d'une tête représentés à la figure 6. Le châssis 280 repose sur la surface de roulement du rail 23 par des galets 35 et il est guidé horizontalement par des vérins 33 et des galets 340. Le châssis 280 est composé de deux poutres tubulaires 36 et 37 carrossées par des tôles présentant vu de front une section triangulaire. Afin de pouvoir modifier l'inclinaison d'une tête de meulage 260 on a monté les tiges 270 sur un balancier 38 (en pointillé) suspendu au châssis 280 de la base de meulage 250 par un vérin 39. Les deux tiges 270 sont guidées dans deux rainures circulaires 40, 41 correspondants aux lignes 40a et 41a de la figure 7. Les rainures 40 et 41 sont des arcs de cercle centrés au point 0'1 qui est le centre de courbure d'un arc de cercle du profil du champignon délimité par les deux tangentes T'l et T'2 formant un angle B'1 qui correspond à l'angle entre les deux positions extrêmes de la tête de meulage l'angle étant de l'ordre par exemple de 10°.Before describing the attachment of the grinding heads we will describe the means for varying the inclination of a head shown in Figure 6. The chassis 280 rests on the running surface of the rail 23 by rollers 35 and it is guided horizontally by jacks 33 and rollers 340. The chassis 280 is composed of two tubular beams 36 and 37 fitted with sheets having, viewed from the front, a triangular section. In order to be able to modify the inclination of a grinding head 260, the rods 270 are mounted on a pendulum 38 (in dotted lines) suspended from the frame 280 of the grinding base 250 by a jack 39. The two rods 270 are guided in two circular grooves 40, 41 corresponding to lines 40a and 41a of FIG. 7. The grooves 40 and 41 are arcs of a circle centered at point 0'1 which is the center of curvature of an arc of a circle of the profile of the delimited mushroom by the two tangents T'l and T'2 forming an angle B'1 which corresponds to the angle between the two extreme positions of the grinding head the angle being of the order for example of 10 °.

Les rainures 40 et 41 peuvent correspondre à un des arcs A1, A2, A3 de la figure 7 des lignes 40a et 41a a ou à la totalité de l'arc A1+A2+A3. Dans le cas de la base représentée à la figure 4 les têtes 26 doivient rester à l'intérieur de l'un des arcs A1, A2 ou A3 comme mentionné précédemment et dans ce cas les rainures 40 et 41 correspondent à une portion de l'un de ces arcs de sorte que les têtes restent respectivement à l'intérieur d'arcs A'1, A"1, A"'1 ou A'2, A"2, A"'3 ou A'3, A"3, A"'3. Les têtes 26 étant solidaires les unes aux autres les tiges de fixation 27 des deux têtes 26 situées aux extrémités sont guidés dans des rainures 40 et 41 et supportées par un balancier 38 et un vérin 39 comme représenté à la figure 6.The grooves 40 and 41 may correspond to one of the arcs A1, A2, A3 in FIG. 7 of the lines 40a and 41a a or to the whole of the arc A1 + A2 + A3. In the case of the base shown in Figure 4 the heads 26 must remain inside one of the arcs A1, A2 or A3 as mentioned above and in this case the grooves 40 and 41 correspond to a portion of the one of these arcs so that the heads remain respectively inside arcs A'1, A "1, A" '1 or A'2, A "2, A"' 3 or A'3, A " 3, A "'3. The heads 26 being integral with one another the fixing rods 27 of the two heads 26 situated at the ends are guided in grooves 40 and 41 and supported by a pendulum 38 and a jack 39 as shown in FIG. 6.

Dans le cas de la base représentée à la figure 5 chaque tête 260 est suspendue au châssis 280 de la base 250 par un dispositif analogue à celui représenté à la figure 6. Ainsi chaque tête 260 est suspendue par des tiges 270 collaborant avec des rainures dont elles sont munies de plaques 43, 44, 45, 46 fixées au châssis 280 comme présenté à la figure 6. Deux plaques que l'on appellera 42 et 47 sont fixées derrière les jambes 290 respectivement 300 de la base 250. Les rainures de chaque couple de plaques 42, 43 ou 44, 45 ou 46, 47 correspondent respectivement à l'un des arcs A1, A2, A3 (fig. 7) ou à la totalité des arcs A1 +A2+A3. Les tiges de guidage 270 sont reliées par des balanciers 38 suspendus et entraînés par des vérins 39 non représentés.In the case of the base shown in Figure 5 each head 260 is suspended from the frame 280 of the base 250 by a device similar to that shown in Figure 6. Thus each head 260 is suspended by rods 270 collaborating with grooves which they are provided with plates 43, 44, 45, 46 fixed to the frame 280 as shown in FIG. 6. Two plates which will be called 42 and 47 are fixed behind the legs 290 respectively 300 of the base 250. The grooves of each pair of plates 42, 43 or 44, 45 or 46, 47 correspond respectively to one of the arcs A1, A2, A3 (fig. 7) or to all of the arcs A1 + A2 + A3. The guide rods 270 are connected by pendulums 38 suspended and driven by jacks 39 not shown.

La modification d'inclinaison d'une tête de meulage (fig. 5) ou d'un ensemble de têtes (fig. 4) entre deux valeurs limites peut être réalisée soit en modifiant d'inclinaison pas à pas, l'entraînement étant commandé par exemple par un moteur, soit en ayant la possibilité de donner à l'inclinaison deux valeurs déterminées. A titre d'exemple pour ce dernier cas on peut considérer une base comme celle représentée à la figure 4 dont l'inclinaison des têtes est respectivement de 70°, 50° et 40° et après modification de l'angle au moyen, par exemple, du dispositif de la figure 6 l'inclinaison respective des têtes est de 60°, 40° et 30°.Changing the inclination of a grinding head (fig. 5) or of a set of heads (fig. 4) between two limit values can be achieved either by changing the inclination step by step, the drive being controlled for example by a motor, or by having the possibility of giving the inclination two determined values. As an example for the latter case, a base like that shown in FIG. 4 can be considered, the heads of which are respectively 70 °, 50 ° and 40 ° and after changing the angle using, for example , of the device of Figure 6 the respective inclination of the heads is 60 °, 40 ° and 30 °.

En résumé une base de meulage peut être composée d'une ou plusieurs têtes de meulage et dans le cas de base à plusieurs têtes l'angle d'inclinaison peut soit être modifié en bloc pour toutes les têtes soit indépendamment l'une de l'autre, soit encore les têtes sont montées fixes sur la base de meulage à une inclinaison déterminée.In summary, a grinding base can be composed of one or more grinding heads and in the case of a base with several heads the angle of inclination can either be modified as a block for all the heads or independently of one of the another, that is to say the heads are mounted fixed on the grinding base at a determined inclination.

Claims (8)

1. A machine for reshaping the head of rails (23), which comprises one or a plurality of grinding unit (26, 260) for each line of rails, means for positioning and feeding a cutting tool or tools (3) on the rail head, said grinding unit or units being so disposed around the rail head that they can form thereon one or more facets according to theoretical tangents (Ti, T2, T3) along one or a plurality of generatrices (Gi, G2, G3) of the theoretical profile of the rail head, characterized by the fact that each grinding unit comprises a member (17; 24) disposed in the plane of said facet or in a plane parallel thereto for detecting the attainment of the cutting tool (3) in the plane of said theoretical tangent and controlling the blocking of said means for positioning and feeding the cutting tool toward said rail head, when said plane of the theoretical tangent is attained.
2. Machine of claim 1, characterized by the fact that said member detecting the attainment of said plane of said theoretical tangent comprises mechanical stop means (19) adapted to be moved under the control of said cutting tool (13), preferably from an inoperative position, and to control the stopping of the cutting tool feed means when said tangent plane is attained.
3. Machine of claim 2, characterized by the fact that said mechanical stop means is adapted to actuate mechanically a hydraulic or pneumatic valve (22) for blocking said positioning and feed means.
4. Machine of claim 2, characterized by the fact that a proximity detector (24) is associated with said mechanical stop means, for detecting the position of said stop means when said plane of the theoretical tangent is attained and controlling a hydraulic or pneumatic valve for blocking said positioning and feed means.
5. Machine of claim 1, characterized by the fact that said means for detecting when the theoretical tangent plane is attained comprises a pneumatic detector controlling a pneumatic or hydraulic valve for blocking said positioning and feed means.
6. Machine of any of claims 1 to 5, characterized by the fact that one or a plurality of grinding units (26, 260) are mounted on a grinding base (25, 250), the operative face of the cutting tool of each grinding unit being disposed parallel to a plane of a different theoretical tangent, and that said grinding base is provided with means for guiding same parallel to the rail axis and to the vertical median plane of the rail.
7. Machine of claim 6, characterized by the fact that said grinding base comprises a plurality of grinding units rigidly assembled with one another, the angle of inclination of each unit differing from the angles of inclination of the other units, and that said base is provided with means, notably in the form of plates with guide slots (40, 41), for modifying the inclination of the assembly of grinding units with respect to a plane transverse to the rail about a predetermined centre of curvature of the theoretical profile of the rail head, thus permitting the successive production of two or more facets approaching the circular arc corresponding to said centre of curvature.
8. Machine of claim 6, characterized by the fact that said grinding base comprises a plurality of grinding units, mounted to said base independently of one another, and that each grinding unit comprises means for varying its angle of inclination in a plane transverse to the rail about one or a plurality of centres of curvature of the circular arcs constituting the profile of the rail.
EP83200699A 1983-05-17 1983-05-17 Machine for reprofiling rail heads Expired EP0125348B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP83200699A EP0125348B1 (en) 1983-05-17 1983-05-17 Machine for reprofiling rail heads
DE8383200699T DE3366980D1 (en) 1983-05-17 1983-05-17 Machine for reprofiling rail heads
AT83200699T ATE22949T1 (en) 1983-05-17 1983-05-17 RAIL HEAD PROFILE RESTORATION MACHINE.
US06/610,383 US4621460A (en) 1983-05-17 1984-05-15 Machine for reshaping rail heads
ES532531A ES8504300A1 (en) 1983-05-17 1984-05-16 Machine for reprofiling rail heads.
JP59096749A JPS603302A (en) 1983-05-17 1984-05-16 Shaving apparatus of rail head part
CA000454403A CA1241561A (en) 1983-05-17 1984-05-16 Pailhead profile grinder
DD84263084A DD219230A5 (en) 1983-05-17 1984-05-16 MACHINE FOR REPROFILING A RAIL HEAD

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83200699A EP0125348B1 (en) 1983-05-17 1983-05-17 Machine for reprofiling rail heads

Publications (2)

Publication Number Publication Date
EP0125348A1 EP0125348A1 (en) 1984-11-21
EP0125348B1 true EP0125348B1 (en) 1986-10-15

Family

ID=8190954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200699A Expired EP0125348B1 (en) 1983-05-17 1983-05-17 Machine for reprofiling rail heads

Country Status (8)

Country Link
US (1) US4621460A (en)
EP (1) EP0125348B1 (en)
JP (1) JPS603302A (en)
AT (1) ATE22949T1 (en)
CA (1) CA1241561A (en)
DD (1) DD219230A5 (en)
DE (1) DE3366980D1 (en)
ES (1) ES8504300A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH654047A5 (en) * 1983-09-16 1986-01-31 Speno International Method and device for continuous reshaping rails of railways.
DE3772057D1 (en) * 1987-11-07 1991-09-12 Scheuchzer Fils Auguste GRINDING MACHINE FOR REPROFILING RAIL HEADS.
CH678341A5 (en) * 1989-03-02 1991-08-30 Speno International
CN103924491A (en) * 2014-04-22 2014-07-16 北京二七机车工业有限责任公司 Grinding head vertical lifting device of rail grinding wagon
CA3110958A1 (en) * 2018-08-27 2020-03-05 Harsco Technologies LLC Rail milling vehicle
WO2022135814A2 (en) 2020-12-22 2022-06-30 Schweerbau International Gmbh & Co. Kg Device and method for grinding a profile

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2035154A (en) * 1935-01-29 1936-03-24 Faries Robert Rail grinding machine
US3358406A (en) * 1965-10-14 1967-12-19 Speno International Rail grinder
CH529260A (en) * 1970-08-14 1972-10-15 Speno Internat S A Method for grinding long wavy waves of railway rails and device for its implementation
DE2410564C3 (en) * 1974-03-06 1978-08-10 Georg Robel Gmbh & Co, 8000 Muenchen Rail head reshaping machine
DE7407724U (en) * 1974-03-06 1978-11-09 Georg Robel Gmbh & Co, 8000 Muenchen RAIL HEAD REFORMING MACHINE
CH592780A5 (en) * 1976-01-07 1977-11-15 Speno International
CH606616A5 (en) * 1976-02-18 1978-11-15 Speno International
CH614476A5 (en) * 1977-10-10 1979-11-30 Scheuchzer Auguste Les Fils D
AT359108B (en) * 1977-11-28 1980-10-27 Plasser Bahnbaumasch Franz RAIL GRINDING MACHINE FOR GRINDING IRREGULARITIES OF THE RAIL DRIVE AREA
US4178724A (en) * 1978-03-23 1979-12-18 Harsco Corporation Rail grinding system
AT369809B (en) * 1979-08-14 1983-02-10 Plasser Bahnbaumasch Franz TRACKABLE MACHINE FOR REMOVING THE RAIL HEAD SURFACE IRREGULARITIES
CH633336A5 (en) * 1980-01-09 1982-11-30 Speno International RAILWAY SITE MACHINE FOR THE GRINDING OF RAIL MUSHROOM.

Also Published As

Publication number Publication date
JPS603302A (en) 1985-01-09
DD219230A5 (en) 1985-02-27
CA1241561A (en) 1988-09-06
DE3366980D1 (en) 1986-11-20
EP0125348A1 (en) 1984-11-21
ATE22949T1 (en) 1986-11-15
ES532531A0 (en) 1985-04-01
US4621460A (en) 1986-11-11
ES8504300A1 (en) 1985-04-01

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