EP3260236A2 - Verfahren und vorrichtung für die zuführung von kühlflüssigkeit während der bearbeitung eines werkstücks mit einer topfschleifscheibe, sowie die dafür verwendete topfschleifscheibe - Google Patents

Verfahren und vorrichtung für die zuführung von kühlflüssigkeit während der bearbeitung eines werkstücks mit einer topfschleifscheibe, sowie die dafür verwendete topfschleifscheibe Download PDF

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Publication number
EP3260236A2
EP3260236A2 EP17176579.5A EP17176579A EP3260236A2 EP 3260236 A2 EP3260236 A2 EP 3260236A2 EP 17176579 A EP17176579 A EP 17176579A EP 3260236 A2 EP3260236 A2 EP 3260236A2
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
coolant
cup grinding
front surface
annular front
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
Application number
EP17176579.5A
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English (en)
French (fr)
Other versions
EP3260236A3 (de
EP3260236B1 (de
Inventor
Marco Belli
Andrea Cucchi
Marco FURLANI
Massimiliano Gervasoni
Roberto LONGATO
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.)
Biesse SpA
Original Assignee
Biesse SpA
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Publication date
Application filed by Biesse SpA filed Critical Biesse SpA
Publication of EP3260236A2 publication Critical patent/EP3260236A2/de
Publication of EP3260236A3 publication Critical patent/EP3260236A3/de
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Publication of EP3260236B1 publication Critical patent/EP3260236B1/de
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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 method and a system for feeding a coolant during machining of a workpiece by means of a cup grinding wheel, and a cup grinding wheel used therein.
  • 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 method according to the preamble of claim 1, a cup grinding wheel according to the preamble of claim 5 and a system according to the preamble of claim 8.
  • a method and a system of this type, as well as a cup grinding wheel of this type, are illustrated in EP 0 483 561 A1 .
  • a cup grinding wheel is known with an annular front surface having a plurality of separated and spaced apart grooves for distributing coolant on the front surface of the cup grinding wheel.
  • Each of these grooves extends from a radially inner edge up to a radially outer edge of the front surface of the cup grinding wheel, so that the coolant is distributed over the entire radial extension of the annular front surface of the cup grinding wheel.
  • 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 method according to claim 1, a cup grinding wheel according to claim 5 and a system according to claim 8.
  • At least one continuous circumferential groove is formed in the said annular front surface of the cup grinding wheel, which preferably intercepts the outlet ports of the said passages leading to the annular front surface of the cup grinding wheel, and which extends in a wavy path, or with zig-zag-shaped segments, so as to distribute the coolant, covering a predominant portion of the radial extension of the annular front surface of the cup grinding wheel.
  • the cooling of the workpiece is improved further since the coolant is injected directly above the workpiece surface in contact with the cup grinding wheel for a predominant portion of the radial extension of the front surface of the cup grinding wheel.
  • manufacture of the cup grinding wheel is simple and quick, since the aforesaid continuous groove can be formed with a single mechanical operation while the grinding wheel is rotated.
  • the coolant (which is simply water) is fed to the said passages formed in the body of the cup grinding wheel by one or more coolant dispensers, arranged in fixed positions outside the drive spindle of the cup grinding wheel.
  • the body of the cup grinding wheel has a rear portion, opposite the annular front machining surface, having a circumferential inner channel acting as a coolant supply manifold, configured to receive coolant from said one or more dispensers and to feed it to said passages leading to the front surface of the cup grinding wheel, which are in communication with said circumferential channel.
  • the jets of coolant are directed by said nozzles 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 construction details of the cup grinding wheel and the coolant supply dispensers which have been illustrated here, are provided purely by way of example.
  • the most general principle underlying the present invention is to form passages in the body of the cup grinding wheel, which lead to the abrasive annular front surface of the cup grinding wheel configured for being supplied with coolant to feed said fluid directly into the area of contact between the abrasive annular front surface and the workpiece being machined.
  • the conformation and arrangement of said passages formed in the body of the cup grinding wheel can vary widely, depending on the needs of each specific application.
  • the provision of an inner circumferential channel in the rear portion of the body of the cup grinding wheel, to create the function of supply manifold of the coolant is hereby provided by way of example only.
  • the shape of the grinding wheel, and in particular, the manner in which the coolant is carried to the passages leading to the abrasive annular front surface of the grinding wheel may vary widely, depending on the specific application requirements. As mentioned above, the same applies to the structure and configuration of the coolant dispensers 10.
  • 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. Still preferably, 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 provision of at least one circumferential continuous groove on the abrasive annular front surface of the cup grinding wheel, according to a wavy or zig-zag pathway, which covers a predominant portion of the radial extension of the aforesaid annular front surface, is however advantageous in a conventional-type cup grinding wheel as well, i.e. not provided with aforesaid passages for the coolant, and designed to cooperate with conventional nozzles for supplying the coolant.
  • a cup grinding wheel is therefore also part of the present invention that is not provided with the coolant supply system described herein but which is, however, provided on its annular front surface with at least one continuous and wavy circumferential groove, of the type described herein.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP17176579.5A 2016-06-22 2017-06-19 Verfahren und vorrichtung für die zuführung von kühlflüssigkeit während der bearbeitung eines werkstücks mit einer topfschleifscheibe, sowie die dafür verwendete topfschleifscheibe Active EP3260236B1 (de)

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 true EP3260236A2 (de) 2017-12-27
EP3260236A3 EP3260236A3 (de) 2018-05-16
EP3260236B1 EP3260236B1 (de) 2019-03-27

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EP17176579.5A Active EP3260236B1 (de) 2016-06-22 2017-06-19 Verfahren und vorrichtung für die zuführung von kühlflüssigkeit während der bearbeitung eines werkstücks mit einer topfschleifscheibe, sowie die dafür verwendete topfschleifscheibe

Country Status (3)

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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109531309A (zh) * 2018-11-27 2019-03-29 黄绍豪 一种用于复合弹簧制造的磨削设备
JP2020019111A (ja) * 2018-08-02 2020-02-06 株式会社ディスコ ホイールマウント
WO2021197027A1 (zh) * 2020-03-30 2021-10-07 桂林创源金刚石有限公司 一种高转速杯形砂轮
CN114603494A (zh) * 2022-03-11 2022-06-10 广东高景太阳能科技有限公司 一种砂轮
WO2022186346A1 (ja) * 2021-03-04 2022-09-09 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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
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

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020019111A (ja) * 2018-08-02 2020-02-06 株式会社ディスコ ホイールマウント
KR20200015378A (ko) * 2018-08-02 2020-02-12 가부시기가이샤 디스코 휠 마운트
CN110788686A (zh) * 2018-08-02 2020-02-14 株式会社迪思科 轮安装座
CN109531309A (zh) * 2018-11-27 2019-03-29 黄绍豪 一种用于复合弹簧制造的磨削设备
WO2021197027A1 (zh) * 2020-03-30 2021-10-07 桂林创源金刚石有限公司 一种高转速杯形砂轮
JP2023519397A (ja) * 2020-03-30 2023-05-10 桂林創源金剛石有限公司 高回転型カップホイール
US12220789B2 (en) 2020-03-30 2025-02-11 Guilin Champion Union Diamond Co., Ltd. High-rotational speed cup-shaped grinding wheel
WO2022186346A1 (ja) * 2021-03-04 2022-09-09 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
JP2022135883A (ja) * 2021-03-04 2022-09-15 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
JP2022135073A (ja) * 2021-03-04 2022-09-15 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
CN114603494A (zh) * 2022-03-11 2022-06-10 广东高景太阳能科技有限公司 一种砂轮

Also Published As

Publication number Publication date
EP3260236A3 (de) 2018-05-16
EP3260236B1 (de) 2019-03-27
ITUA20164592A1 (it) 2017-12-22
ES2732431T3 (es) 2019-11-22

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