EP1189731B1 - Procede et installation de fabrication de meules abrasives et meule fabriquee par ce procede - Google Patents

Procede et installation de fabrication de meules abrasives et meule fabriquee par ce procede Download PDF

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Publication number
EP1189731B1
EP1189731B1 EP00949522A EP00949522A EP1189731B1 EP 1189731 B1 EP1189731 B1 EP 1189731B1 EP 00949522 A EP00949522 A EP 00949522A EP 00949522 A EP00949522 A EP 00949522A EP 1189731 B1 EP1189731 B1 EP 1189731B1
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EP
European Patent Office
Prior art keywords
layer
layers
wheel
station
stack
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 - Lifetime
Application number
EP00949522A
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German (de)
English (en)
French (fr)
Other versions
EP1189731A1 (fr
Inventor
Georges Bancon
Jean-Marie Albrecht
Jean-Jacques Bris
Nicolas Résidence les Toíts St Jean FAURES
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.)
Saint Gobain Abrasifs Technologie et Services SAS
Original Assignee
Saint Gobain Abrasifs Technologie et Services SAS
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Publication date
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Publication of EP1189731A1 publication Critical patent/EP1189731A1/fr
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Publication of EP1189731B1 publication Critical patent/EP1189731B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses

Definitions

  • the invention relates to the manufacture of abrasive wheels, and more precisely a method and an installation for manufacturing such wheels, as well as mills obtained, see GB-A-673 334, which describes the preamble of claims 1 and 7 and a wheel, of the type thin wheel, having at least one layer formed from abrasive grains and two layers not containing abrasive grains.
  • the cut-off wheels generally, we have in a mold placed on a production tray, a central ring around which one Stacks layers of various materials to form the wheel; by example, a protective sheet called “paper” is deposited.
  • the automatic implementation of this process is generally on a rotary table of generally circular shape with sectors are arranged as workstations; each station is equipped with several identical tools to perform the same task simultaneously on the several molds, the first task being the establishment of the ring, and the last being the unloading of the grinding wheels after pressing, this one being realized on the table.
  • the rotary table can for example, to include six positions (for setting up the ring, place of the "paper”, the laying of the "fabric", the discharge of the powdery product and scraping by means of a sliding drawer tool, the installation of the second "fabric", the establishment of the second "paper”, the pressing and the unloading) and four tools per station, which requires that the table already has an area of several square meters; a bigger job specialization quickly leads to eight-station facilities, and the need to manufacture a larger quantity, to each have nine tools.
  • Tasks can be spread across multiple rotating tables between which the sets being manufactured need to be transferred, and this especially as the number of layers of powdery products so tooling with drawers must be higher.
  • the speed of rotation of the table is imposed by the duration of the longest task that is usually the spill of the product powder and its scraping, or pressing if it is carried out in continuity with the previous tasks.
  • the object of the invention is to remedy these drawbacks and For this purpose, a method of manufacturing grinding wheels comprising an abrasive product, thin-wheel type as claimed in claim 1.
  • the method comprises a step of superimpose at least two constituent layers, one of which is a slab at least from abrasive grains, and to assemble these at minus two layers of constituent.
  • Constant layer means a layer comprising at least one least a material intended to constitute the grinding wheel. These materials are in particular of the type of protective sheet called “paper”, or of the type sheet of so-called “fabric” reinforcement, or of the type of a layer formed from abrasive grains comprising a coating constituted by a binder.
  • slab means a constituent layer which has a consistency such as the slab can be manipulated, and in particular grasping and moved by hand or using a machine.
  • At least one slab is consisting of adhesive grains coated with a binder.
  • At least one slab comprises, in addition to abrasive grains coated with a binder, at least one layer component without abrasive grain, especially a reinforcing sheet, especially made from glass fibers.
  • the time of passage at each post can be significantly reduced since it no longer depends on the duration spill operations of the powdery product or pressing under high pressure.
  • the cake when the cake comprises at least one layer of component free of abrasive, it is first poured into the mold an abrasive product formed from abrasive grains having a coating constituted by a binder, the level of abrasive product is equalized to a desired value, then at least one further layer of abrasive-free, including a reinforcement sheet, above the level of the abrasive product and the assembly consisting of at least one sheet of reinforcement and abrasive product.
  • This last variant is particularly adapted to the realization so-called "extra-thin” wheels whose thickness is, for example, less than 2 mm, or even equal to or less than 1 mm.
  • This particular type of grinding wheel is generally consists of a “monolayer” grinding wheel, and asks to be made with the utmost care to avoid problems of unbalance or lack of product in certain areas of the grinding wheel which are particularly acute when producing this type of grinding wheel by traditional methods. We notes indeed that the reinforcement layers are poorly distributed in the millstone.
  • first depositing the abrasive grains and then reinforcing foil and then squeezing the whole makes it possible to obtain a cake planar and parallel faces where the reinforcing sheet has been well maintained in place against the upper face of the mold during the pressing operation.
  • Stacking at least one other constituent layer on said slab is with a flat reference surface and makes it possible to obtain, after pressing, the set, a grinding wheel where the reinforcing sheets are distributed in a plane way and controlled in the grinding wheel. It is then possible to manufacture "extra-thin" wheels Of 0, 5 mm or even 0.4 mm thick, or even grinding wheels monograins in the thickness.
  • the invention also relates to a mill manufacturing facility comprising an abrasive product, of the type thin grinding wheel, as claimed in claim 7.
  • This installation comprises in a variant at least one machine for making pancakes from grains abrasives, an assembly line including, in particular, succession on the basis of which layers intended to constitute the grinding wheel and comprising at least one slab from the manufacture of pancakes are superimposed to form a stack of layers superimposed, followed by a heating station where the stack of layers is heated, and at least one pressing machine for compressing the battery, this pressing machine being in the form of a pressing station at the end of the line assembly or following the assembly line.
  • the installation comprises on the one hand a machine of manufacture of patties and, secondly, an oven and a pressing station, the pressing operations can be performed under moderate pressure.
  • the manufacturing machine slab is integrated into the assembly line. It should be noted that it is also possible to make an installation with the elements arranged in line.
  • the arrangement of the elements of pressing could be reversed, with the removable tray located above the mold.
  • the battery to be pressed on the bottom of the mold, then the bottom of the mold and mold until the sidewalls of the mold come in contact with the underside of the tray to close the mold and to be able to start the pressing operation.
  • the invention also relates to a grinding wheel comprising a product abrasive, of the type thin wheel, manufactured by the method defined above.
  • This grinding wheel may comprise at least one reinforcing layer pierced with holes in which is distributed part of the abrasive product, which is formed to from abrasive grains.
  • the manufacture of an abrasive wheel does not include no step of pouring on a layer of reinforcement called "fabric", a pulverulent abrasive product formed from abrasive grains but on the other hand a step of manufacturing from such abrasive grains having a coating constituted by a binder, an abrasive slab that can be used in as a constituent layer in the manufacture of the grinding wheel; for this purpose, can for example superimpose this cake to a conventional reinforcement layer itself superimposed on a layer called “paper”, and cover it with a second layer of reinforcement which is in turn covered by a "paper” for constitute a so-called “monolayer” wheel (that is to say a single layer abrasive); one can also, in order to constitute a multilayer wheel, superimpose on a reinforcement layer as many times a slab and a new reinforcement layer that this is necessary to get the features required.
  • fabric a layer of reinforcement called "fabric”
  • the machine 1 for making pancakes illustrated by the diagram of the FIG. 1 comprises a rotary table 10 step-by-step general circular comprising here four sectors equipped with molds, and specialized fixed workstations for performing the different tasks or manufacturing operations on the contents of the molds when these pass in front of them; thus, several patties can be simultaneously being manufactured on the table 10. It also has a table 11 rotary storage on which the slabs made on the table 10 are aligned or / and stacked before being picked up for transfer to an assembly line.
  • the positions that equip the machine 1 are a spill station abrasive 12, a scraper equalizing station 13, a pressing station 14, a unloading station of the slabs 15, and a cleaning station of the table 16.
  • the molds generally cylindrical in shape, have a wall side 17 within which is mounted a sliding bottom 18 adapted for sliding in the vertical direction, provided with a central core 19.
  • the abrasive discharge station 12 is provided at its upper part of a reservoir 121 of abrasive product consisting of abrasive grains comprising a coating constituted by a binder; at the bottom, the dumping station has a closable slot so that the product can be dumped into the mold when it is positioned under the slot, the bottom of the mold being positioned in the side wall to a depth greater than the thickness desired for the cake.
  • the station equalizer 13 scrapes the product flush with the side wall 17 of the mold.
  • the pressing station 14 compresses the product by means of a force of the order of a few tons (or tens of thousands of newtons), forming the slab A intended to be introduced into the assembly line which will be described in the following.
  • the unloading station 15 transfers the slabs A from the table of manufacturing 10 at the storage table 11.
  • the cleaning station 16 cleans the sector of the table 10 that passes in vis-à-vis, downstream of the unloading station.
  • each of the four sectors of the table 10 is equipped with a single mold, there is simultaneously or almost a mold in filling course, a mold being scraped off, a cake being pressing, and a cake being unloaded from the manufacturing table.
  • patties are ready to be introduced in an assembly line, it is easier to manufacture grinding wheels different dimensions and for example from “monolayer” grinding wheels to “multilayer” grinding wheels or to go from the manufacture of grinding wheels 115 mm in the manufacture of 125 mm wheels and conversely.
  • the tools of the posts being not very complex, can in case of manufacturing change or breakdown, be exchanged very quickly.
  • the rotary table is of relatively small dimensions (the diameter can be reduced to a value less than one meter), and the molds, used only for the manufacture of pancakes, are of low weight (less 15 kg).
  • the pressing force to exert on the abrasive product to constitute the patties one by one is relatively moderate, of the order of a few tons (or tens of thousands of newtons), for about 1 second.
  • the assembly line 2 illustrated by the diagram of FIG. intended for the manufacture of abrasive two-layer grinding wheels, so here in two patties.
  • This conveyor comprises a conveyor 20 progressing in a closed circuit, along which are allocated specialized fixed workstations to carry out respectively the different operations of manufacture of the grinding wheel proper.
  • This conveyor carries trays fixed on it, adapted for receive removable trays 201 on which, as and when scroll of the conveyor, are stacked on one another the different elements and in particular the different layers of constituents of the grinding wheels.
  • the assembly line 2 comprises in succession in the direction of travel of the conveyor 20, a central ring setting station 21, a basic "paper” laying station 22, a layer laying station lower reinforcement 23, a lower slab installation station 24, a laying a central reinforcing layer 25, a top pancake setting station 26, an upper reinforcement layer installation station 27, a stationary installation station Upper “paper” 28, a heating station 29, and an unloading station and reloading 30.
  • Each workstation intended to superimpose a layer of constituent has a stock of batteries each carried by a removable tray 201, and thus a short interruption in the operation of one of the posts for example due to a failure does not completely interrupt the manufacturing millstones, downstream workstations working on their stock, and upstream positions that can be ordered to increase theirs. We obtain therefore here advantageously a desynchronization of manufacturing operations.
  • the heating station 29 heats the batteries P which run through it at a temperature of about 50 to 80 ° C which facilitates a slight flow of the product abrasive material constituting the slabs in the holes of the reinforcing layer, by example meshes in the case of a real fabric or the like.
  • the assembly line has a certain modularity and the increase of number of layers can be done by simply adding the number of positions appropriate; for example, to make three-slab wheels, to add to the assembly line that has just been described, a station of installation of patties and a reinforcing layer setting station.
  • the laying stations can be automated or manuals.
  • the installation includes a pressing machine 3 in which the removable plates with their contents, leaving the heating station 29, are transferred by the unloading station and reload 30; alternatively, this pressing machine could make part of the assembly line.
  • the pressing machine 3 comprises a rotary table of form circular system comprising, for example, six sectors equipped with identical cylinder passing in turn to a tray receiving location.
  • Each removable tray reaching the unloading and reloading station 30 with its pounded is transferred to the cylinder press momentarily at this site, which, continuing its circular route, presses the pile on the tray and then interrupts the pressing in such a way in a disposal site, the grinding wheel produced as a result of the pressing of the still hot pile is evacuated from the press by an evacuation station and the removable tray 201 is transferred again, by the unloading station and reloading 30, on the conveyor 20.
  • part of the abrasive product of each slab being distributed in the holes of the layers of reinforcement, the different layers of constituents are joined together, and after cooling the grinding wheel presents its final structure.
  • the duration of the pressing step is relatively low, and as each press works only on one stack, the pressing force can remain relatively moderate (of the order of 20 tons that is, about 2.10 5 N).
  • the press 31 a part of which is schematically represented on the FIG. 3 comprises a mobile upper tool comprising a mold of pressing adapted to fit at the top around the stack P of layers of components placed on the removable plate 201, during the pressing operation, and secured to a mold support 310 attached to the end of the piston of the cylinder.
  • This mold comprises a bottom 311 and a sliding side wall 312 around the bottom, so that the pressing force can be applied basically at the bottom 311 of the mold and thus to avoid the deterioration of the side wall 312 thereof; preferably, the side wall 312 is in two parties in order to be able to change which of the two parts that is intended to come apply against the removable tray, in case of deterioration.
  • the bottom of mold is secured to the mold support 310 by at least one device to springs which, in the absence of stress, keep the bottom of the mold at a distance of the mold support, and which, when the bottom of the mold bears against the stack, compresses to allow the mold support to bottom of the mold and transmit to him the totality of the pressing force;
  • Wall side of the mold is secured in the same way to the mold support, this difference that the free end of the side wall is set back (upwards) a few millimeters from the bottom, while the distance from the mold support is approximately the same as long as neither the bottom nor the side wall is supported, that is to say as long as the springs of their respective securing devices are not compressed.
  • the bottom 311 of the mold comes into contact with the pile P while the side wall 312 is not yet in contact with the removable tray 201.
  • the mold support 310 pursuing its stroke, the springs compressing, the distance between the mold support and the bottom of the mold begins to diminish, and after a ruzement of some millimeters, the side wall of the mold itself comes into contact with the removable tray 201; the mold support 310 still pursuing its course, it comes into contact with the bottom 311 of the mold and the pressing force is then applied to the pile P, while the mold support is still not in contact with the side wall 312 which, being itself in contact with the plate removable 201, prevents any lateral development of the layers of the battery P.
  • the cylinder is retracted upwards, the support of 310 mold goes back to the beginning of the rise of the side wall 312 mold up, while the bottom 311 of the mold is still applied against the pile P, then goes back in turn while the side wall continues its ascent.
  • the pressing machine comprises in part lower a cam surface 316 traversed by a roller secured by a spacer device 314 to the support of the removable tray 201 (FIGS. 6).
  • the cam surface 316 has three levels. The lower level of the Cam surface corresponds to the pressing step.
  • the 314 support takes off from the machine table pressing, and the grinding wheel being at a level higher than the free end of the pin 315 can be pushed laterally towards an evacuation conveyor; when the roller, continuing its path on the cam surface 316, reaches the higher level thereof, the support 314 moves further away from the table, and the removable tray 201 itself arrives at a level higher than the end free of pin 315, and so can be transferred back to the line assembly to receive a new ring and a new stack of layers of constituents.
  • the wheels unloaded from the pressing machine 31 are then known way, transferred to another oven to undergo annealing before to be stored for delivery.
  • Some or all of the transfer operations can be manual.
  • the production line illustrated in the diagram of FIG. intended for the manufacture of single-layer wheels from a slab A comprising a reinforcing sheet.
  • a press 31 of the type of that described in FIG. can be used and correspond to the 550 press machine of sector 500.
  • This system makes it possible to quickly change all locations X and Y, either of one sector or of all sectors of the rotary table 700 in order, for example to change the size of the locations X and Y to produce wheels of a different size.
  • the production line can be manual, semi-automatic or completely automated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP00949522A 1999-06-09 2000-06-09 Procede et installation de fabrication de meules abrasives et meule fabriquee par ce procede Expired - Lifetime EP1189731B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9907282 1999-06-09
FR9907282A FR2794676B1 (fr) 1999-06-09 1999-06-09 Procede et installation de fabrication de meules abrasives, et meule fabriquee par ce procede
PCT/FR2000/001602 WO2000074898A1 (fr) 1999-06-09 2000-06-09 Procede et installation de fabrication de meules abrasives et meule fabriquee par ce procede

Publications (2)

Publication Number Publication Date
EP1189731A1 EP1189731A1 (fr) 2002-03-27
EP1189731B1 true EP1189731B1 (fr) 2005-06-08

Family

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EP00949522A Expired - Lifetime EP1189731B1 (fr) 1999-06-09 2000-06-09 Procede et installation de fabrication de meules abrasives et meule fabriquee par ce procede

Country Status (10)

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US (2) US6866691B1 (cs)
EP (1) EP1189731B1 (cs)
KR (1) KR100726343B1 (cs)
AU (1) AU6285400A (cs)
CZ (1) CZ303401B6 (cs)
DE (1) DE60020700T2 (cs)
ES (1) ES2241631T3 (cs)
FR (1) FR2794676B1 (cs)
PL (1) PL199297B1 (cs)
WO (1) WO2000074898A1 (cs)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2898070B1 (fr) * 2006-03-06 2009-01-09 Saint Gobain Abrasifs Tech Meule d'ebarbage fine, utilisation de cette meule, procede et dispositif pour la fabriquer
EP2177318B1 (en) * 2009-04-30 2014-03-26 Saint-Gobain Abrasives, Inc. Abrasive article with improved grain retention and performance
DE102011112412A1 (de) * 2011-09-06 2013-03-07 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Harzgebundene Trennscheibe
WO2017113448A1 (zh) * 2015-12-30 2017-07-06 廊坊盛森磨具有限公司 砂轮成型机用摊料装置
ITUA20162123A1 (it) * 2016-03-30 2017-09-30 Davide Maternini S P A Macchina di stampaggio in linea per un disco abrasivo
CN106041769B (zh) * 2016-07-20 2018-08-03 郑州磨料磨具磨削研究所有限公司 一种树脂抛光工具自动生产线
CH715030B1 (de) 2018-05-29 2020-09-30 Reishauer Ag Verfahren zur Herstellung dünner Schleifkörper.
CN110014381B (zh) * 2019-04-20 2020-11-03 浙江引领自动化科技有限公司 一种砂轮制造流水线的收料分隔机构
CN111421478B (zh) * 2019-10-15 2024-04-30 唐山市名鲨五金磨具有限公司 一种砂轮半成品自动穿工装设备

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Also Published As

Publication number Publication date
PL352162A1 (en) 2003-07-28
US6866691B1 (en) 2005-03-15
US7195550B2 (en) 2007-03-27
EP1189731A1 (fr) 2002-03-27
CZ20014394A3 (cs) 2002-08-14
DE60020700T2 (de) 2006-05-04
US20050090192A1 (en) 2005-04-28
PL199297B1 (pl) 2008-09-30
KR100726343B1 (ko) 2007-06-11
FR2794676A1 (fr) 2000-12-15
WO2000074898A1 (fr) 2000-12-14
CZ303401B6 (cs) 2012-08-29
FR2794676B1 (fr) 2001-08-10
KR20020028894A (ko) 2002-04-17
AU6285400A (en) 2000-12-28
ES2241631T3 (es) 2005-11-01
DE60020700D1 (de) 2005-07-14

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