EP2205399A1 - Method of fabrication of grinding wheels and related plant - Google Patents
Method of fabrication of grinding wheels and related plantInfo
- Publication number
- EP2205399A1 EP2205399A1 EP07849697A EP07849697A EP2205399A1 EP 2205399 A1 EP2205399 A1 EP 2205399A1 EP 07849697 A EP07849697 A EP 07849697A EP 07849697 A EP07849697 A EP 07849697A EP 2205399 A1 EP2205399 A1 EP 2205399A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- abrasive mixture
- mobile bottom
- mold table
- level
- 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.)
- Granted
Links
- 238000000227 grinding Methods 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000203 mixture Substances 0.000 claims abstract description 87
- 230000002787 reinforcement Effects 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000011049 filling Methods 0.000 claims abstract description 28
- 238000000151 deposition Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims description 24
- 238000011068 loading method Methods 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 235000015895 biscuits Nutrition 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims 2
- 230000009471 action Effects 0.000 abstract description 6
- 238000005520 cutting process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- XRKMYXDEMOEFBN-UHFFFAOYSA-N potassium;[2-butyl-5-chloro-3-[[4-[2-(1,2,3-triaza-4-azanidacyclopenta-2,5-dien-5-yl)phenyl]phenyl]methyl]imidazol-4-yl]methanol;6-chloro-1,1-dioxo-3,4-dihydro-2h-1$l^{6},2,4-benzothiadiazine-7-sulfonamide Chemical compound [K+].C1=C(Cl)C(S(=O)(=O)N)=CC2=C1NCNS2(=O)=O.CCCCC1=NC(Cl)=C(CO)N1CC1=CC=C(C=2C(=CC=CC=2)C=2[N-]N=NN=2)C=C1 XRKMYXDEMOEFBN-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000008521 reorganization Effects 0.000 description 1
- 230000003362 replicative effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- 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.
- the high level of automation and high yield imposed by evident reasons of minimizing the fabrication costs of typically consumable tools such as grinding wheels are requirements that must in any case conjugate themselves with the need of ensuring the maximum homogeneity of the density of the finished wheel in consideration of the fact that they are destined to function at extremely high rotational speed.
- 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 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: - lifting said mobile bottom at a first level equal to or lower than the level of the planar surface of the mold table;
- 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.
- Figure 1 is a simplified layout of an automatic machine for fabricating grinding wheels in green or biscuit form consolidated by pressing at room temperature of a known type as here specified by the applicant.
- Figure 2 shows the layout of an automatic machine of the same type of the known machine of Figure 1, modified in a way to implement the novel process of this invention.
- 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 workstations 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 bl, moving along a radial axis of the work-station, for picking up four circular reinforcement nets rl 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 bl 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 cl 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 cl 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 cl, during the repeated passage of the whole drawer cl 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 cl 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 hi 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: Cl 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 fl 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 workstations, 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 Cl 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 rl 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 cl 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 Cl 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 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
- the two scraper blades el l and cl2 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 el l and cl2, 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 workstation 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 el and of the metal grommet bml 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2007/000728 WO2009050749A1 (en) | 2007-10-18 | 2007-10-18 | Method of fabrication of grinding wheels and related plant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2205399A1 true EP2205399A1 (en) | 2010-07-14 |
EP2205399B1 EP2205399B1 (en) | 2011-09-07 |
Family
ID=39595691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07849697A Active EP2205399B1 (en) | 2007-10-18 | 2007-10-18 | Method of fabrication of grinding wheels and related plant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2205399B1 (en) |
AT (1) | ATE523292T1 (en) |
WO (1) | WO2009050749A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUA20162123A1 (en) * | 2016-03-30 | 2017-09-30 | Davide Maternini S P A | MOLDING MACHINE IN LINE FOR AN ABRASIVE DISC |
IT201600119933A1 (en) * | 2016-11-28 | 2018-05-28 | Davide Maternini S P A | Molding system for abrasive discs with weight filling |
IT202000018754A1 (en) | 2020-07-31 | 2022-01-31 | Davide Maternini S P A | REVERSE PRESSING MACHINE FOR ABRASIVE DISCS |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1399287B1 (en) | 2010-03-11 | 2013-04-11 | Davide Maternini S P A | METHOD OF MANUFACTURE OF ABRASIVE WHEELS AND ITS AUTOMATIC MACHINE |
CN102152251B (en) * | 2011-01-24 | 2013-04-10 | 谢泽 | Combined method for producing abrasive cloth flap disc automatically |
ITVA20120013A1 (en) * | 2012-05-28 | 2013-11-29 | Davide Maternini S P A | MOLDING MACHINE OF AN ABRASIVE WHEEL AND ITS RELATED MOLDING PROCESS. |
CN102699835B (en) * | 2012-06-25 | 2014-04-09 | 郑州市弘毅机械有限公司 | Rotary multiple-station forming machine for grinding wheel |
CN103072100B (en) * | 2013-02-01 | 2014-12-24 | 莒县科发设备厂 | Swing-type automatic grinding wheel molding machine |
CN104290046A (en) * | 2013-07-16 | 2015-01-21 | 宁波大华砂轮有限公司 | Automation grinding wheel mold unloading machine |
CN105364733B (en) * | 2015-09-29 | 2018-05-29 | 郑州丰宏机械设备科技有限公司 | A kind of band handle Impeller Shaping machine |
DE102015221294B3 (en) * | 2015-10-30 | 2017-05-04 | Neenah Gessner Gmbh | Grinding wheels, in particular cutting wheels, and manufacturing method therefor |
WO2017113448A1 (en) * | 2015-12-30 | 2017-07-06 | 廊坊盛森磨具有限公司 | Spreading device for form grinding machine |
CN108081164A (en) * | 2016-11-21 | 2018-05-29 | 郑州狮虎磨料磨具有限公司 | Hard grinding wheel production line |
CN107097158B (en) * | 2017-06-25 | 2019-05-07 | 新昌县寅创汽车配件有限公司 | A kind of formation system making elastic module |
IT201800010678A1 (en) * | 2018-11-29 | 2020-05-29 | Davide Maternini S P A | MACHINE FOR PRESSING AN ABRASIVE DISK AND RELEVANT PRESSING METHOD |
IT201900003663A1 (en) | 2019-03-13 | 2020-09-13 | Davide Maternini S P A | EQUIPMENT FOR MANUFACTURING ABRASIVE DISCS AND RELATIVE METHOD |
CN110065013B (en) * | 2019-04-17 | 2021-01-15 | 郑州大河智信科技股份公司 | Automatic strickling process for precise metal grinding wheel grinding tool |
CN111002238B (en) * | 2019-11-22 | 2021-03-16 | 辽宁程瑞砂轮有限公司 | Grinding wheel molding material strickles device off |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3868793A (en) * | 1973-06-18 | 1975-03-04 | Norton Co | Internally safety reinforced cup grinding wheel |
JPS53106987A (en) * | 1977-02-28 | 1978-09-18 | Heijirou Fukuda | Method of continuously manufacturing resinnbonded thin layer artificial grinding wheel for use in cutting hard materials |
EP1473117A1 (en) * | 2003-04-29 | 2004-11-03 | Davide Maternini S.p.A. | Fabrication process and plant for grinding wheels |
-
2007
- 2007-10-18 WO PCT/IT2007/000728 patent/WO2009050749A1/en active Application Filing
- 2007-10-18 EP EP07849697A patent/EP2205399B1/en active Active
- 2007-10-18 AT AT07849697T patent/ATE523292T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2009050749A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUA20162123A1 (en) * | 2016-03-30 | 2017-09-30 | Davide Maternini S P A | MOLDING MACHINE IN LINE FOR AN ABRASIVE DISC |
IT201600119933A1 (en) * | 2016-11-28 | 2018-05-28 | Davide Maternini S P A | Molding system for abrasive discs with weight filling |
IT202000018754A1 (en) | 2020-07-31 | 2022-01-31 | Davide Maternini S P A | REVERSE PRESSING MACHINE FOR ABRASIVE DISCS |
Also Published As
Publication number | Publication date |
---|---|
WO2009050749A1 (en) | 2009-04-23 |
ATE523292T1 (en) | 2011-09-15 |
EP2205399B1 (en) | 2011-09-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2205399B1 (en) | Method of fabrication of grinding wheels and related plant | |
WO2011110947A1 (en) | Method of fabrication of grinding wheels and related automatic machine | |
CN102699835B (en) | Rotary multiple-station forming machine for grinding wheel | |
CN104911053A (en) | White spirit brewing retort loading dispersing machine suitable for multiple types of liquor retorts | |
CN104354262B (en) | Automatic contact pin injection molding production device | |
CN105500519A (en) | Core-lifting rotary type vibrating extrusion forming tubing machine | |
CN206215913U (en) | A kind of powder centrifugation supply of 3D printing, vibration ramming device | |
CN104872307A (en) | Hand-tamped fuzhuan tea production device and method | |
CN101818763B (en) | Device for sleeving bearing ring | |
CN201810683U (en) | Sheathing device of bearing ring | |
CN109333388A (en) | A kind of feeding-discharging mechanism producing the rotary production line of soft abrasive disk | |
CZ303401B6 (en) | Process for producing grinding wheels, apparatus for their manufacture and grinding wheel produced thereby | |
CN204934465U (en) | A kind of end cap lock seaming machine | |
US3666582A (en) | Chip placement in a grid patterned sheet | |
CN216181431U (en) | Building block stamping forming equipment | |
CN109333387A (en) | A kind of rotary production line of soft abrasive disk and its control method | |
CN105668246A (en) | Storage unit of self-adaptive rotary material bin | |
CN110202101A (en) | A kind of new and effective moulding machine and processing method easy to maintain | |
CN201831053U (en) | Full-automatic upper napping machine | |
JP7037617B1 (en) | Brake pad molding equipment for automobiles | |
US2324574A (en) | Means for the manufacture of floor coverings or the like | |
CN208648057U (en) | Press strip automatic charging machine | |
CN209110877U (en) | A kind of rotary production line of soft abrasive disk | |
CN209078563U (en) | A kind of feeding-discharging mechanism producing the rotary production line of soft abrasive disk | |
CN208093361U (en) | A kind of form forming magnetic core mold |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090122 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602007017076 Country of ref document: DE Effective date: 20111103 |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: VDEP Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
LTIE | Lt: invalidation of european patent or patent extension |
Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20111208 Ref country code: CY Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 523292 Country of ref document: AT Kind code of ref document: T Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20120107 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111031 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20120109 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111031 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111031 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
26N | No opposition filed |
Effective date: 20120611 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20111207 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111018 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602007017076 Country of ref document: DE Effective date: 20120611 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111018 Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111207 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20111218 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20111018 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BG Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20111207 |
|
PGRI | Patent reinstated in contracting state [announced from national office to epo] |
Ref country code: IT Effective date: 20130628 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: TR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: HU Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20110907 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 9 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 10 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 11 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20181030 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20181102 Year of fee payment: 13 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602007017076 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20200501 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20191031 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20231004 Year of fee payment: 17 |