EP2205399B1 - Verfahren zur herstellung von schleifrädern und entsprechende anlage - Google Patents

Verfahren zur herstellung von schleifrädern und entsprechende anlage Download PDF

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Publication number
EP2205399B1
EP2205399B1 EP07849697A EP07849697A EP2205399B1 EP 2205399 B1 EP2205399 B1 EP 2205399B1 EP 07849697 A EP07849697 A EP 07849697A EP 07849697 A EP07849697 A EP 07849697A EP 2205399 B1 EP2205399 B1 EP 2205399B1
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mold
abrasive mixture
mobile bottom
mold table
level
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French (fr)
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EP2205399A1 (de
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Giuseppe Maternini
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Davide Maternini SpA
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Davide Maternini SpA
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    • 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

  • This invention relates to the fabrication of grinding wheels and in particular of grinding wheels having a relatively small thickness (ultrathin).
  • Fabrication processes of grinding wheels are well known as well as fabrication plants that tend to be ever more automated, with processing lines defined by a succession of workstations each dedicated to perform one or more operations.
  • a first fundamental step of fabrication of these consumable tools consists in weighting according to a certain dosage formulation the different solid and fluid components of the abrasive mixture and in mixing them together either simultaneously or preferably by adding them into the mix in more steps for obtaining a homogeneous powdery abrasive mixture of reproducible characteristics.
  • This phase of preparation of the abrasive mixture is generally carried out in a batch-wise manner, producing a certain quantity of mixture.
  • a highly automated production line generally has a certain number of automated workstations for introducing in a mold cavity the various items that commonly compose the grinding wheel in an appropriate sequence, before reaching a press station.
  • a first operation may consist in optionally introducing a first reinforcement metal grommet of the central hole of the grinding wheel on a central pin of the mold, and in laying on the bottom of the mold at least a first disk of reinforcement fabric, generally a net of resin impregnated fibers of a high tensile strength material preceded or not by the laying of a paper label printed with characteristic data of the grinding wheel.
  • the mold cavity or cavities of a planar mold table are filled with the premixed abrasive mixture released by a distributing hopper-drawer travelling forward and backward over the mold table and provided with front and rear containment and scraper blades.
  • At least a second disk of reinforcement net is laid onto the abrasive mixture and, in a successive workstation, a preprinted label with data and characteristics of the grinding wheel being fabricated is eventually laid on top of the reinforcement net, if so chosen in alternative to a prior placement of such a label onto the bottom of the mold.
  • the process may contemplate placing two reinforcement metal grommets of the central hole of the grinding wheel on the same central pin of the mold: one before the filling with the abrasive mixture and a second placed after, before pressing.
  • a single reinforcement metal grommet of the central hole of the grinding wheel is placed on the central pin of the mold after filling it, in a workstation preceding the press workstation.
  • the press workstation include a press equipped with one or a plurality of plates for compacting the abrasive mixture inside respective mold cavities thus consolidating at room temperature the components introduced in the mold, shaping the grinding wheel in form of a "biscuit" consolidated only by pressure, but whose thermosetting binder has not yet been subjected to the hardening conditions (reticulation of the thermosetting resin binder, commonly of phenolic type).
  • the not yet hardened grinding wheels so fabricated are still flexible and plastically deformable. They will assume their final mechanical properties only after heat treatment in oven.
  • grinding wheels designed for cutting operations are tools having a relatively fast wear and the industry, whenever work conditions make it possible, prefers to use cutting wheels of reduced thickness for sensible savings in terms of reduced energy consumption and consumption of abrasive material.
  • Grinding wheels producers have on and on refined the fabrication technology toward the objective of producing cutting wheels of reduced thickness that could nevertheless ensure adequate mechanical characteristics.
  • Present technology permits to fabricate grinding wheels of diameter that may reach up to about 230 mm and thickness from 1.0 mm to 3,5 mm.
  • the filling step of the mold cavity with the abrasive mixture has a great influence on the mechanical qualities of the finished grinding wheel.
  • the repeated scraping action along the same direction of translation of the distributor drawer tends to increase the density of the mixture that fills the cavity near opposite arcs of the circular rim of the mold, because of the dragging caused by the passage of the two scraper blades of the distributor drawer over the filled cavities.
  • the speed at which the distributor drawer travels first in a direction and after in the opposite direction is relatively fast for comprehensible reasons of productivity.
  • the document EP-A-1473 117 discloses a process according to the preamble of claim 1 and a machine according to the preamble of claim 12, respectively.
  • the new process overcomes the drawbacks and criticalnesses of known processes, sensibly improving reliability of the fabrication process that results in an almost total abutment of failure statistics of the fabricated grinding wheels.
  • the filling of a preestablished quantity of abrasive mixture in a cavity of a mold table defined in a hole inside which a mobile bottom may be lifted at preestablished levels comprises performing in succession the steps of:
  • the step of removing and the mixture in excess levelling the abrasive mixture filling the mold cavity is performed by a single pass of a scraper blade.
  • productivity is fully preserved and in addition even the speed of translation of the scraper blade can be reduced for further reducing stresses on the mass of abrasive mixture filling the mold cavity.
  • a circular crown rotating table 5 comprises eight mold tables 2, each having four holes 3, occluded by respective mobile bottoms 4, for defining four mold cavities.
  • all the mold tables 2 reach in succession the eight work-stations A, B, C, D, E, F, G and H of the machine.
  • the station A is generally a "free" or service work-station that permits inspection of the mold cavities and removal of eventual residues, before the mold table advances to the work-station B, which is equipped with automatically controlled handling devices, indicated as a whole with b1, moving along a radial axis of the work-station, for picking up four circular reinforcement nets r1 from a belt conveyor b2 of a mechanism of controlled supply of the reinforcement nets.
  • the supply mechanism is covered by a hood b3 for realizing an at least partially confined region that may be heated in order to raise and maintain the temperature of the reinforcement nets several degrees above room temperature, if necessary, for favoring a complete relaxation in case undulations and/or warpings may have been induced by mechanical stresses during die stamping the disks.
  • the radially shifting handling device b1 carries the picked up quarted of disks exactly above four the cavities of the mold table 2 and deposit them onto the respective mobile bottoms 4 of the holes 3.
  • the same mold table 2 successively reaches the work-station C for levelling of a certain amount of abrasive mixture inside each cavity with mobile bottom of the mold table.
  • this work-station C has, underneath the rotating table 5, lifting devices of the mobile bottoms 4 of the mold cavities at a certain level, such to determine with adequate precision the filling volume of abrasive mixture that upon pressing it at a preestablished load will produce the compacting of the material in form of a "biscuit" of a design thickness.
  • the filling of the mold cavities with a certain quantity of abrasive mixture takes place by moving the distributor drawer c1 above the surface of the mold table 2 that composes the rotating table 5 of the machine, radially toward the center of rotation such that by passing over the mold cavities, the free flowing abrasive mixture contained in the distributor drawer c1 falls by gravity filling the mold cavities and is immediately shaved off and levelled therein by the action of two containment scraper blades c2 and c3, elastically bearing on the surface of the table, disposed at two opposite sides, respectively and alternately at the leading edge and at trailing edge, of the distributor drawer c1, during the repeated passage of the whole drawer c1 above the mold cavities, first advancing toward the center of rotation of the table and the second returning to its rest or stand-by position.
  • the abrasive mixture swept by the scraper blade falls in a hopper for where it is recycled back to a supply container c4 by means of the belt conveyor c5.
  • Feeding of abrasive mixture into the drawer c1 takes place by means of the feed belt conveyer c5, carrying the material out of the supply reservoir c4.
  • the mold table with its four mold cavities in which the preestablished amount of abrasive mixture has been introduced reaches the work-station D equipped in a practically identical manner of the already described work-station B, in order to place over the levelled amount of abrasive mixture contained inside the mold cavities a second disk of reinforcement net r2, also in this case preferably preheated for relaxing eventual warps.
  • the pressing at room temperature of the elements introduced in the mold cavities carried out at a preestablished load sufficient to determine an effective consolidation of all the components of the grinding wheel in the form of a biscuit that can be handled without excessive care and that in the successive and last work-station H of the machine is expelled by lifting the mobile bottoms of the mold cavities.
  • the so consolidated "green" grinding wheels are staked on suitable basements to form packs h1 that are then transferred by a conveyor h2 inside an oven for cooking at a temperature and for a time sufficient to ensure reticulation of the thermosetting resin binder, generally a phenolic resin.
  • Figure 2 represents a simplified layout of an automatic machine made or obtained by modifying an existing machine according to the present invention for implementing the improved process of loading of the mold cavities.
  • the loading of a predetermined quantity of abrasive mixture in mold cavities in two distinct steps performed in two successive work-stations of the machine for retaining unchanged the productivity (i.e. without prolonging the cycle of automatic operation), the organization of the work-stations incrementally reached by the mold tables 2, may be modified as illustrated.
  • the staging over two successive work-stations: C1 and C2 of the steps of loading the mold cavities with the preestablished amount of abrasive mixture, is enabled by combining in a single work-station, re-nominated E&F in Figure 2 , the operations of loading the metal grommet of reinforcement of the central hole of the grinding wheel and of the printed paper label, thus shifting of one position the station D at which the second reinforcement net is loaded.
  • the automatic handling devices f1 of introduction of the quartet of reinforcement metal grommets f2 over the central pins (observable in successive drawings) of the four molds of each mold table 2 and the automated handling devices for picking up and placing the quarted of paper labels, are commonly of different form and quite compatible to be installed in a same work-station without particular problems. Moreover, both operations, beside not being particularly critical, may be quickened for remaining within the residence time of the mold tables 2 in the work-stations of the machine. Therefore, this simple reorganization will permit to use an existing basic structure of automatic machine for implementing the process of this invention.
  • the partial elevation views permit to observe a common architecture of the structure of a mold table 2, part of the rotating table 5 of a machine and the support and lifting structures of the mobile bottoms 4 of the mold cavities, the lifting structures being present in all or only in few of the work-stations, according to requirements.
  • Each mold table 2 has holes the inner diameter of which is defined by cylindrical inserts 3, commonly of a hard metal alloy, resistant to abrasion, defining the mold cavities.
  • the mobile bottoms 4 of the mold cavities are commonly sustained by a single mobile base plate 8, sliding along upright guides and along the four pins 9 that define the central hole of the grinding wheels being fabricated.
  • Three screws 7 allow adjustment of parallelism of the mobile bottoms 4 in respect to the plane of the table.
  • This trimming device is useful for prearranging a certain bias inclination of few degrees or of a fraction of a degree of the mold bottoms, for volumetrically compensating for a residually small increment of density of the abrasive mixture filling the cavity near the part of the circular rim of the cavity that is last passed over by the scraper blade moving over the surface of the table.
  • the upright guides (not detailed in the drawing) connect the mold plate to a fixed rest plate that together with the upright guide rods, constitutes a robust suspension structure, indicated as a whole with 10 in the drawings, solidly connected to the rotating table 5.
  • the mobile bottoms 4 have a superficial wear disk (not detailed in the figures) of a hard metal alloy that is held fast on a underlying disk by a plurality of permanent magnets. By removing the wear disk, it is possible to access the head of the screws 7 for trimming the spatial inclination of the mold bottoms in respect to the horizontal plane of the rotating mold tables of the rotating table 5.
  • the mobile base plate 8 bears at its lower end stop onto the fixed rest plate of the suspension structure indicated as a whole with 10 from which extend upright the central pin 9, when the lifting stems 11 of the mobile bottoms 4 of the molds are retracted and thus disengaged from the suspension structure 10 by central actuator devices of the work-station.
  • the rotating table assembly rotates during phases of advancement of the mold tables 2 from a station to the next.
  • Lifting stems 11 for positioning the mobile bottoms 4 of the molds at preestablished levels must be present at least below the work-stations C1 and C2 dedicated to the loading of the abrasive mixture.
  • the first action is performed by the stems 11 that lift the base plate 8 to a level such to bring the mobile bottom of the mold cavities with the first reinforcement net r1 resting on them, to a level few tens of a millimeter, in case of ultrathin wheels, and up to a maximum of about 3 mm, in case of wheels particularly thick, lower than the level of the surface of the mold table.
  • the distributor drawer c1 that according to an essential aspect of the method of this invention does not carry any scraper blade held in contact with the surface of the mold table, is first advanced along a radial axis of the work-station C1 as far as flying over the whole area of the mold table 2 at a height from the surface of the mold table appropriate for depositing a layer of abrasive mixture M of a certain and substantially uniform thickness over the mold table, along the track of radial movement, forward and backward of the distribution drawer filling any depression in correspondence of the mold cavities as determined by said first level of lifting of the mobile bottoms 4, as depicted in Figures 4 and 5 .
  • the lifting stems 11 are retracted and disengaged from the overhanging structure of the rotating table, thus lowering the mobile bottoms 4 of the mold cavities to their end run rest position, carrying thereon the abrasive mixture of the deposited layer bearing on their surface, as depicted in Figure 6 .
  • the two scraper blades typically thin, penetrate through layer M abrasive mixture one close to the other without any significant separation distance between them.
  • the stems 11 of the underlying lifting structure of the work-station lift the mobile bottoms 4 carrying the first reinforcement net and the layer of uniform thickness of abrasive mixture up to a second level which is precisely established for volumetrically determining the amount of powdery abrasive mixture to be compacted.
  • This second level is generally lower or in the limit equal to the first level of lifting of the same mobile bottoms during the deposition over the surface of the mold table of the layer of uniform thickness of abrasive mixture ( Figures 4 and 5 ).
  • the two scraper blades c11 and c12 move in opposite radial directions, sweeping the abrasive mixture of the deposited layer M, passing over the two pairs of mold cavities, respectively, levelling the powdery content filling them, as far as dropping the excess abrasive mixture that had been deposited with uniform thickness over the mold table, into the collecting hoppers c3 and c4, respectively disposed one at the outer side and one at the inner side of the rotating circular crown table, along the radial axis of the work-station C2, as depicted in Figure 9 , where are also observable the respective belt conveyors c5 and c5' that lift the recovered excess mixture into the supply reservoir c4 ( Figure 2 ).
  • Figure 10 illustrates the retraction of the lifting stems 11 out of engagement with the overhanging structure of the rotating table and the movements of lifting off the surface of the table and of returning to a median stand-by position of the two scraper blades c11 and c12, ready to lower themselves again onto the surface of a new mold table 2 that will reach the station (thus replicating the cyclic situation represented in Figure 7 ).
  • the mold table 2 will advance as far as reaching the work-station D for receiving the second reinforcement net (also in this case preferably preheated as done for the first reinforcement net) onto the levelled volume of abrasive mixture, before progressing through the terminal phases of loading of the paper label e1 and of the metal grommet bm1 of reinforcement of the central hole of the grinding wheel onto the central pin 6 of the molds, as already described with reference to the machine layout of Figure 2 .
  • the second reinforcement net also in this case preferably preheated as done for the first reinforcement net

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (13)

  1. Herstellungsverfahren einer Schleifscheibe durch Bilden eines Biskuits, das verfestigt wird, indem eine bestimmte Menge einer pulverförmigen Schleifmischung, die ein wärmehärtendes Bindemittel enthält, mindestens eine Metalldurchführung zur Verstärkung eines zentralen Lochs der Scheibe und optional ein oder mehrere Verstärkungsnetze aus harzgetränkten Fasern aus einem hoch zugfesten Material in einer Form gepreßt werden, und das hergestellte Biskuit in einem Ofen ausgehärtet wird, wobei das Laden einer vorgegebenen Menge der Schleifmischung in einen Formhohlraum eines Formtischs, der durch einen beweglichen Boden verschlossen ist, der auf eine Vorbestimmtes Niveau angehoben wird, die aufeinanderfolgende Durchführung der folgenden Arbeitsgänge aufweist:
    - Anheben des beweglichen Bodens auf ein erstes Niveau, das gleich oder niedriger als das Niveau der Oberfläche des Formtischs ist;
    - Absetzen auf der Oberfläche des Formtischs einer Schicht mit einer bestimmten gleichmäßigen Dicke der Schleifmischung, während der bewegliche Boden auf dem ersten angehobenen Niveau gehalten wird; gekennzeichnet durch danach
    - Absenken innerhalb des Lochs des Formtischs des beweglichen Bodens, der die Masse der auf seiner Oberfläche abgesetzten Schleifmischung trägt;
    - Anheben des beweglichen Bodens auf ein zweites vorbestimmtes Niveau, das gleich oder niedriger als das erste Niveau ist;
    - Entfernen der Schleifmischung der Schicht von der Oberfläche des Formtischs, wobei die Schleifmischung eingeebnet wird, die den Formhohlraum füllt;
    - Absenken des beweglichen Bodens innerhalb des Lochs.
  2. Verfahren nach Anspruch 1, wobei die Entfernung und Einebnung der Schleifmischung in einem einzigen Durchgang durch eine Schabklinge durchgeführt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß es durch aufeinanderfolgendes Vorschieben einer Anordnung des Formtisches und des beweglichen Bodens durch mehrere Arbeitsstationen durchgeführt wird, wobei mindestens die Arbeitsstationen zur Absetzung der Schicht der Schleifmischung mit einheitlicher Dicke auf der Oberfläche des Formtischs und die Arbeitsstation zur Entfernung und Einebnung mit Hebeeinrichtungen des beweglichen Bodens ausgestattet sind.
  4. Verfahren nach Anspruch 3, wobei der Formtisch mehrere Löcher mit jeweiligen beweglichen Böden aufweist, die ebenso viele Formhohlräume begrenzen, die durch ein einheitliches Hebemittel bewegt werden.
  5. Verfahren nach Anspruch 4, wobei die Formhohlräume auf einer Seite und auf der anderen Seite einer Mittellinie des Formtischs angeordnet sind, wobei der Arbeitsgang der Entfernung und Einebnung durch ein Paar paralleler Schabbänder durchgeführt wird, die auf die Oberfläche des Tischs längs der Mittellinie abgesenkt werden und in entgegengesetzte Richtungen bewegt werden, um den Formtisch mit einer reduzierten Geschwindigkeit von der abgesetzten Mischung in der selben Zeit freizumachen, die für einen einzigen Durchgang benötigt wird, der mit einer einzelnen Schabklinge durchgeführt wird.
  6. Verfahren nach Anspruch 3, wobei mehrere in der gleichen Ebene liegende Formtische einen kreisförmigen Kranz bilden, der um Winkelschritte gedreht wird, um jeden Formtisch dazu zu bringen, aufeinanderfolgend die Arbeitsstationen zu erreichen, wobei sich der Verteilungsabsetzer und das oder die Mittel zur Entfernung und Einebnung längs einer radialen Richtung bewegen.
  7. Verfahren nach Anspruch 1, das ferner die Arbeitsgänge des Legens eines ersten Verstärkungsnetzes auf die Oberfläche des beweglichen Bodens und eines zweiten Verstärkungsnetzes auf die eingeebnete Schleifmischung jeweils vor und nach der Ausführung der Abfolge der Arbeitsgänge aufweist.
  8. Verfahren nach Anspruch 7, wobei die Verstärkungsnetze vor ihrem Einbringen in die Form vorgewärmt werden.
  9. Verfahren nach Anspruch 1, wobei als letzter Arbeitsgang von dem Pressen die Metalldurchführung zur Verstärkung des Mittellochs der Schleifscheibe auf einen Mittelstift angeordnet wird, der sich durch ein Loch des beweglichen Bodens der Form erstreckt.
  10. Verfahren nach Anspruch 7, wobei ein Papieretikett über den Verstärkungsnetzen angeordnet wird.
  11. Verfahren nach Anspruch 7, gekennzeichnet durch die Tatsache, daß auf dem beweglichen Boden des Formhohlraums ein Papieretikett angeordnet wird, das elektrostatisch vorgeladen ist, um etwaige Wölbungen auszustrecken, bevor das erste Verstärkungsnetz darauf gelegt wird.
  12. Automatische oder halbautomatische Maschine zur Herstellung eines Biskuits, das verfestigt wird, indem eine bestimmte Menge einer pulverförmigen Schleifmischung, die ein wärmehärtendes Bindemittel enthält, zusammen mit mindestens einem Papieretikett, einem ersten und einem zweiten Verstärkungsnetz aus Fasern aus einem hoch zugfesten Material, die mit einem Harz getränkt sind, und mindestens eine Metalldurchführung zur Verstärkung eines Mittellochs der Scheibe gepreßt werden, um anschließend in einem Ofen gehärtet zu werden, die eine Anordnung von in der gleichen Ebene liegenden Formtischen aufweist, die einen kreisförmigen Kranz bilden, der um Winkelschritte gedreht wird, um jeden Formtisch aufeinanderfolgend durch mehrere Arbeitsstationen der Maschine zu bringen, wobei jeder Formtisch ein oder mehrere Löcher aufweist, innerhalb derer ein jeweiliger beweglicher Boden vom Niveau der Oberfläche des Formtischs im Loch auf vorbestimmte Niveaus zum Modifizieren der Tiefe des Formhohlraums anhebbar ist, dadurch gekennzeichnet, daß das Laden einer bestimmten Menge der Schleifmischung in jeden Formhohlraum mit beweglichen Boden eines Formtischs in zwei unterschiedlichen und nacheinander erreichten Arbeitsstationen durchgeführt wird;
    - die erste der beiden aufeinanderfolgenden Arbeitsstationen Hebemittel der beweglichen Böden der Hohlräume des Formtischs und einen Mischungsverteilungsabsetzer aufweist, der sich von einer Bereitschaftsposition zu einer ausgefahrenen Position bewegt, wobei er zum Absetzen darauf einer Schicht einer bestimmten Dicke der Schleifmischung über der Oberfläche des Formtischs fliegt, während der bewegliche Boden der Formhohlräume, auf dem vorher mindestens ein erstes Verstärkungsnetz angeordnet worden ist, auf einem angehoben Niveau gehalten wird, das gleich oder niedriger als das Niveau der Oberfläche des Formtischs ist, wobei der bewegliche Boden des Formhohlraums nach dem Vollenden der Absetzung der Schicht der Schleifmischung abgesenkt wird;
    - die zweite der beiden aufeinanderfolgenden Stationen aufweist: Hebemittel des beweglichen Bodens des Formhohlraums des Tischs auf ein zweites Vorbestimmtes Niveau, das gleich oder niedriger als das erste Niveau ist, mindestens eine Schabklinge und Mittel, um sie auf die Oberfläche des Tischs abzusenken und sie zum Entfernen der Schleifmischung der auf den Tisch abgesetzten Schicht über die Oberfläche des Tischs zu schieben, wobei der Inhalt der Schleifmischung eingeebnet wird und die Formhohlräume in einem einzigen Durchgang gefüllt werden, Trichter zur Rückgewinnung der von der Oberfläche des Tischs entfernten Schleifmischung und Mittel zur Wiederverwertung der zurückgewonnenen Schleifmischung in einem Zufuhrreservoir der vorhergehenden Arbeitsstation zum Absetzen der Schicht der Schleifmischung.
  13. Automatische oder halbautomatische Maschine nach Anspruch 12, wobei jeder Formtisch aufweist: mehrere der Formhohlräume, die auf einer Seite und auf der anderen Seite einer Mittellinie des Tischs angeordnet sind, die zu einem Umfang des kreisförmigen Kranzes tangential ist, ein Paar Schabklingen und jeweilige Mittel, um sie zusammen längs der Mittellinie abzusenken und um die beiden Klingen in entgegengesetzte radiale Richtungen zu bewegen, wobei die entfernte Schleifmischung in zwei Trichtern zur Wiederverwertung der Mischung zurückgewonnen wird, die jeweils an der Innenseite und an der Außenseite des Formtischs angeordnet sind.
EP07849697A 2007-10-18 2007-10-18 Verfahren zur herstellung von schleifrädern und entsprechende anlage Active EP2205399B1 (de)

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ITUA20162123A1 (it) * 2016-03-30 2017-09-30 Davide Maternini S P A Macchina di stampaggio in linea per un disco abrasivo
CN108081164A (zh) * 2016-11-21 2018-05-29 郑州狮虎磨料磨具有限公司 超硬砂轮生产线
IT201600119933A1 (it) * 2016-11-28 2018-05-28 Davide Maternini S P A Sistema di stampaggio per dischi abrasivi con riempimento a peso
IT201800010678A1 (it) * 2018-11-29 2020-05-29 Davide Maternini S P A Macchina di stampaggio di un disco abrasivo e relativo metodo di stampaggio
IT201900003663A1 (it) 2019-03-13 2020-09-13 Davide Maternini S P A Apparecchiatura di fabbricazione di dischi abrasivi e relativo metodo
CN110065013B (zh) * 2019-04-17 2021-01-15 郑州大河智信科技股份公司 一种精密金属砂轮磨具自动刮平工艺
CN111002238B (zh) * 2019-11-22 2021-03-16 辽宁程瑞砂轮有限公司 砂轮成型料刮平装置
IT202000018754A1 (it) 2020-07-31 2022-01-31 Davide Maternini S P A Macchina di stampaggio per dischi abrasivi a pressa inversa

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CN107097158A (zh) * 2017-06-25 2017-08-29 杨帆 一种制作弹性模块的成型系统
CN107097158B (zh) * 2017-06-25 2019-05-07 新昌县寅创汽车配件有限公司 一种制作弹性模块的成型系统

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