EP3260236B1 - Procédé et système pour distribuer un liquide de refroidissement pendant l'usinage d'une pièce avec une meule boisseau, ainsi que la meule - Google Patents

Procédé et système pour distribuer un liquide de refroidissement pendant l'usinage d'une pièce avec une meule boisseau, ainsi que la meule Download PDF

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Publication number
EP3260236B1
EP3260236B1 EP17176579.5A EP17176579A EP3260236B1 EP 3260236 B1 EP3260236 B1 EP 3260236B1 EP 17176579 A EP17176579 A EP 17176579A EP 3260236 B1 EP3260236 B1 EP 3260236B1
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EP
European Patent Office
Prior art keywords
grinding wheel
cup grinding
cup
coolant
front surface
Prior art date
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Application number
EP17176579.5A
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German (de)
English (en)
Other versions
EP3260236A3 (fr
EP3260236A2 (fr
Inventor
Marco Belli
Andrea Cucchi
Marco FURLANI
Massimiliano Gervasoni
Roberto LONGATO
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Biesse SpA
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Biesse SpA
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Publication of EP3260236A2 publication Critical patent/EP3260236A2/fr
Publication of EP3260236A3 publication Critical patent/EP3260236A3/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
    • B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • B24B13/043—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing using cup-type grinding wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with cooling provisions

Definitions

  • the present invention relates to a cup grinding wheel assembly with a system for feeding a coolant during machining of a workpiece.
  • Cup grinding wheels are tools used for abrasion processes, comprising a cup-shaped body, with an annular front machining surface, typically incorporating diamond particles or other very hard materials.
  • the cup grinding wheel is mounted on a rotating spindle and brought into contact with the surface to be machined in order to perform the required machining.
  • Examples of machining by means of a cup grinding wheel are the machining of the edges of glass sheets or of natural or synthetic stone material, in so-called "bilateral" machines, in which the sheet to be machined is advanced horizontally along a longitudinal direction, while a pair of grinding wheels arranged on both sides of the sheet simultaneously perform the machining of the two side edges of the sheet parallel to the advancing direction.
  • Cup grinding wheels are also used in other types of glass sheet or stone slab machining machines, for example, in work centers with numerical control of three or more axes, where a working head moves relative to a sheet kept in a fixed horizontal position on a work plane.
  • the cup grinding wheel requires the feeding of coolant into the machining area. This is typically achieved by providing external nozzles held in a position adjacent to the grinding wheel and configured to send one or more jets of coolant adjacent to the surface portion of the workpiece with which the cup grinding wheel is in contact.
  • the invention relates in particular to a cup grinding wheel assembly according to the preamble of claim 1.
  • An assembly of this type is illustrated in EP 0 483 561 A1 .
  • Various configurations of grooves on the annular front surface of a cup grinding wheel are known from EP 1 859 904 A1 , DE 24 25 179 A1 and US 5 674 116 A .
  • the object of the present invention is to overcome the disadvantages of the known solutions, ensuring optimum cooling in the area of contact between the cup grinding wheel and the workpiece, without having an excessively complicated construction or an excessive manufacturing cost of the cup grinding wheel.
  • the invention relates to a an assembly according to claim 1.
  • jets of coolant are directed against the wall of the inner circumference channel of the cup grinding wheel.
  • the coolant is pushed by centrifugal force along the entire circumferential extension of the channel and from this through the aforesaid passages formed in the body of the cup grinding wheel, leading to the annular front surface of the cup grinding wheel. In this way, the coolant is applied exactly to the area of contact between the annular front surface of the cup grinding wheel and the workpiece.
  • the invention allows improved cooling in the machining area of the cup grinding wheel, which results in a lower wear of the cup grinding wheel, resulting in greater uniformity of the degree of finishing of the workpieces in a production line and, overall, a better quality and increased production efficiency.
  • the construction of the cup grinding wheel is relatively simple and economical.
  • reference numeral 1 indicates, in its entirety, an electro-spindle assembly comprising a support body 2 within which a spindle 3 is rotatably supported around an axis 4, by means of roller bearings 5.
  • the spindle 3 is driven by an electric motor M, partially visible in Figure 1 .
  • a circular disk flange 7 is attached by means of screws 6, for attaching a cup grinding wheel 8.
  • a plurality of electro-spindle assemblies of the type illustrated in Figures 1 and 3 can be provided in a bilateral machine for simultaneously working the opposite edges of a glass sheet or stone material that is made to advance through the machine.
  • the present invention is of general application, not being limited to the specific embodiment that is illustrated in the attached drawings purely by way of example and, instead, being usable on any type of machine and for any type of machining where a cup grinding wheel is used.
  • the cup grinding wheel 8 comprises a cylindrical cup-shaped body, indicated in its entirety by 9, having an axis 90 and an annular front surface 91, which constitutes the abrasive machining surface of the grinding wheel.
  • the annular front surface 91 typically incorporates particles of a very hard material, such as diamond particles, according to a conventional technique in this field.
  • the body 9 is constituted in this case by three elements welded together or otherwise rigidly connected.
  • the abrasive front surface 91 forms part of a separate annular element 92, which is joined to an annular body 93 defining the rear portion of the body 9 by means of interposing an additional ring 93A.
  • the body of the cup grinding wheel could, however, also be produced in one piece or in a different number of pieces.
  • the specific configuration described herein has been chosen since it facilitates the manufacture of the grinding wheel and obtainment of the passages that are formed through the grinding wheel body and which are described below.
  • the body 9 of the cup grinding wheel 8 comprises a central disc 94 (which in the illustrated example forms part of the annular body 93 defining the rear portion of the body of the grinding wheel) having a central hole 95.
  • the disc 94 of the cup grinding wheel 8 body is centered over the attachment flange 7, as a cylindrical portion 70 protruding from the front face of the flange 7 is received within the hole 95 of the disc 94.
  • the rear surface of the disc 94 of the body of the grinding wheel i.e. the surface facing to the left in Figure 2 , rests- in the mounted condition- against the front face of the attachment flange 7 and is held against it by means of screws 71, by means of which the central disc 94 of the grinding wheel is clamped between the front face of flange 7 and a front clamp plate 72.
  • the transverse half-cross section of the body of the cup grinding wheel 8 in a plane containing the axis 90, is essentially T-shaped, with a peripheral cylindrical wall extending axially from the disc 94 both forwards, to define the abrasive annular front surface 91, and in the opposite direction, with a wall portion 93, which protrudes axially from the rear face of the central disc 94.
  • the cylindrical wall portion 93 ends with a border defining a circular aperture 80 concentric with the axis 90 of the body of the cup grinding wheel.
  • the inner surface of the cylindrical portion 93 defines an inner circumferential channel 96, with a circular profile, designed to define a feed manifold for a coolant to be fed into the area of contact between the abrasive annular front surface 91 of the cup grinding wheel 8 and the workpiece.
  • the inner circumferential channel 96 communicates with a plurality of axial passages 81 formed in the body of the cup grinding wheel and having outlet ports leading to the abrasive annular front surface 91 of the cup grinding wheel 8.
  • the axial passages 81 have respective portions formed within said elements and in communication with each other.
  • the system according to the invention comprises a coolant supply system, including one or more coolant dispensers 10.
  • a coolant dispenser 10 comprising a body 101 supported in a fixed position by the support structure 2.
  • the body 101 of each dispenser 10 is arranged on the outside of the spindle assembly 2 adjacent to the end of the spindle carrying the cup grinding wheel 8.
  • Each body 101 has a distal portion protruding axially within the body of the cup grinding wheel through the rear circular opening 80 adjacent to the rear face of the central disc 94 of the grinding wheel body.
  • each coolant dispenser 10 Within the body 101 of each coolant dispenser 10, one or more passages 102 are formed for the coolant, which receive the coolant from a manifold channel 103 ( Figure 3 ).
  • the manifold channel 103 formed in the body of each dispenser 10 receives, in turn, the coolant through a connection R (see Figure 1 ) intended to be connected to a feed pipe (not shown in Figure 1 ) that receives pressurized coolant from a feed pump (not shown in the drawings) or network water, according to a conventional technique.
  • each dispenser 10 has outlet ports 104 facing radially outwards and facing the wall of the inner circumferential channel 96 of the cup grinding wheel 8.
  • the spindle 3 is rotated by the electric motor M and the electro-spindle assembly is made to advance in the direction of the axis 4 to carry the abrasive annular front surface 91 of the cup grinding wheel 8 in contact with the surface of the workpiece to be machined, for example, a lateral edge of a sheet L of glass or of stone material advancing in an orthogonal direction with respect to the axis 4 ( Figure 1 ).
  • the pressurized coolant is fed from the coolant supply system to the inlet connections R of the dispensers 10.
  • the coolant enters through the connections R into the manifold channels 103 and then flows into the passages 102.
  • the jets of coolant leaving the ports 104 of the dispensers 10 are directed against the wall of the inner circumferential channel 96 formed in the rear cylindrical portion of the cup grinding wheel 8.
  • the coolant is forced by centrifugal force to distribute along the entire circumference of the circumferential channel 96 and to flow through the axial passages 81 leading to the abrasive annular front surface 91.
  • the coolant is directed exactly into the area of contact between the abrasive annular front surface of the cup grinding wheel and the surface of the workpiece being machined. This allows optimal cooling, which reduces the wear of the grinding wheel, avoids excessive heating of the machining area and allows the maintenance of an essentially uniform degree of finishing of the workpieces in a production line.
  • the distribution of the coolant into the area of contact between the cup grinding wheel and the workpiece being machined is further improved since at least one circumferential groove T is formed on the annular front surface of the cup grinding wheel 8, which extends along a wavy path, in order to distribute the coolant on a predominant part of the radial extension of the annular front surface of the grinding wheel.
  • This circumferential groove T is arranged in such a way as to intercept the outlet ports of the passages 81 leading to the annular front surface 91 of the cup grinding wheel 8 (see Figure 4 ).
  • the aforesaid circumferential groove T follows a sinusoidal path.
  • the path followed by the groove T could be any shape.
  • the embodiment illustrated here utilizes axial passages 81 leading to the abrasive annular front surface 91 of the cup grinding wheel 8 in a direction orthogonal to the plane of the surface 91.
  • the passages 81 can also be formed in such a way as to direct the jets of coolant along directions non-orthogonal to the plane of the front surface of the cup grinding wheel 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Claims (1)

  1. Ensemble de meule boisseau, comprenant :
    - un corps de support (2) à l'intérieur duquel une broche (3) est supportée en rotation autour d'un axe (4),
    - une meule boisseau ayant un corps cupuliforme (9) avec une surface annulaire d'usinage avant (91) où des passages (81) sont formés dans le corps cupuliforme (9), menant à la surface annulaire avant (91) de la meule boisseau, qui peuvent être utilisés pour fournir un liquide de refroidissement dans la zone de contact entre ladite surface annulaire avant (91) de la meule boisseau (8) et la pièce à travailler (L) étant usinée,
    ledit ensemble de meule étant caractérisé en ce que :
    - au moins une rainure circonférentielle continue (T) est formée dans ladite surface annulaire avant (91) de la meule boisseau (8), s'étendant selon un chemin ondulé ou en zigzag, de façon à être appropriée pour distribuer un liquide de refroidissement couvrant une partie prédominante de l'extension radiale de la surface annulaire avant (91) susmentionnée de la meule boisseau (8),
    - sur une extrémité de ladite broche (3), une bride de disque circulaire (7) est fixée au moyen de vis (6),
    - la meule boisseau (8) est fixée sur ladite bride de disque circulaire (7),
    - le corps (9) de la meule boisseau (8) présente un disque central (94) qui est centré sur ladite bride (7), une partie cylindrique (70) faisant saillie à partir d'une face avant de la bride (7) étant reçue dans un trou (95) dudit disque central (94) du corps (9) de meule boisseau,
    - le corps (9) de la meule boisseau (8) comporte en outre une paroi cylindrique périphérique s'étendant axialement à partir du disque (94) à la fois dans une direction vers l'avant, pour définir ladite surface annulaire avant (91), et dans la direction opposée, avec une partie de paroi (93) qui fait saillie axialement à partir de la face arrière du disque central (94), définissant une ouverture circulaire arrière (80) concentrique à l'axe (90) du corps de la meule boisseau (8),
    - la surface interne de ladite partie de paroi (93) définit un canal circonférentiel interne (96), avec un profil circulaire, conçu pour définir un collecteur d'alimentation pour un liquide de refroidissement à fournir dans la zone de contact entre la surface annulaire abrasive avant (91) de la meule boisseau (8) et la pièce à travailler,
    - ledit système comprenant en outre au moins un distributeur de liquide de refroidissement (10) comprenant un corps de distributeur (101) supporté par le corps de support (2) dans une position fixe, ledit corps de distributeur (101) ayant une partie distale faisant saillie axialement à l'intérieur du corps de la meule boisseau à travers l'ouverture circulaire arrière (80) adjacente à la face arrière du disque central (94) du corps de meule (9),
    - à l'intérieur du corps (101) dudit au moins un distributeur de liquide de refroidissement (10), au moins un passage (102) est formé de façon à avoir un orifice de sortie (104) faisant face radialement vers l'extérieur et faisant face à la paroi dudit canal circonférentiel interne (96) de la meule boisseau (8).
EP17176579.5A 2016-06-22 2017-06-19 Procédé et système pour distribuer un liquide de refroidissement pendant l'usinage d'une pièce avec une meule boisseau, ainsi que la meule Active EP3260236B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A004592A ITUA20164592A1 (it) 2016-06-22 2016-06-22 Metodo e sistema per l'adduzione di fluido refrigerante durante la lavorazione di un pezzo mediante una mola a tazza, e mola a tazza in essi utilizzata

Publications (3)

Publication Number Publication Date
EP3260236A2 EP3260236A2 (fr) 2017-12-27
EP3260236A3 EP3260236A3 (fr) 2018-05-16
EP3260236B1 true EP3260236B1 (fr) 2019-03-27

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EP17176579.5A Active EP3260236B1 (fr) 2016-06-22 2017-06-19 Procédé et système pour distribuer un liquide de refroidissement pendant l'usinage d'une pièce avec une meule boisseau, ainsi que la meule

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EP (1) EP3260236B1 (fr)
ES (1) ES2732431T3 (fr)
IT (1) ITUA20164592A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP7100524B2 (ja) * 2018-08-02 2022-07-13 株式会社ディスコ ホイールマウント
CN109531309B (zh) * 2018-11-27 2021-08-24 台州市黄岩智威模具有限公司 一种用于复合弹簧制造的磨削设备
CN111438643B (zh) * 2020-03-30 2024-05-14 桂林创源金刚石有限公司 一种高转速杯形砂轮
JP6945903B1 (ja) * 2021-03-04 2021-10-06 オオノ開發株式会社 加工工具およびその加工工具を用いた加工装置
CN114603494B (zh) * 2022-03-11 2023-04-25 高景太阳能股份有限公司 一种砂轮

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Publication number Priority date Publication date Assignee Title
DE2425179A1 (de) * 1973-05-31 1975-01-02 Pramet N P Z Praskove Metalurg Schleifscheibe
US5129190A (en) * 1990-10-31 1992-07-14 Eaton Corporation Machining and apparatus
US5674116A (en) * 1996-10-09 1997-10-07 Cmi International Inc. Disc with coolant passages for an abrasive machining assembly
US7384329B2 (en) * 2006-05-23 2008-06-10 Saint-Gobain Abrasives Technology Company Coolant delivery system for grinding tools

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Also Published As

Publication number Publication date
EP3260236A3 (fr) 2018-05-16
ITUA20164592A1 (it) 2017-12-22
ES2732431T3 (es) 2019-11-22
EP3260236A2 (fr) 2017-12-27

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