US20180071892A1 - Coolant supply device and grinding tool having a coolant supply device for a machine tool - Google Patents

Coolant supply device and grinding tool having a coolant supply device for a machine tool Download PDF

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Publication number
US20180071892A1
US20180071892A1 US15/701,907 US201715701907A US2018071892A1 US 20180071892 A1 US20180071892 A1 US 20180071892A1 US 201715701907 A US201715701907 A US 201715701907A US 2018071892 A1 US2018071892 A1 US 2018071892A1
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US
United States
Prior art keywords
tool
supply device
coolant supply
grinding
coolant
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.)
Abandoned
Application number
US15/701,907
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English (en)
Inventor
Robert Jung
Florian Lau
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.)
Deckel Maho Pfronten GmbH
Original Assignee
Deckel Maho Pfronten GmbH
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Filing date
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Assigned to DECKEL MAHO PFRONTEN GMBH reassignment DECKEL MAHO PFRONTEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUNG, ROBERT, LAU, FLORIAN
Publication of US20180071892A1 publication Critical patent/US20180071892A1/en
Abandoned legal-status Critical Current

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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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • B24B55/03—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant designed as a complete equipment for feeding or clarifying coolant
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0003—Arrangements for preventing undesired thermal effects on tools or parts of the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
    • B23Q11/1023—Tool holders, or tools in general specially adapted for receiving the cutting liquid from the spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1076—Arrangements for cooling or lubricating tools or work with a cutting liquid nozzle specially adaptable to different kinds of machining operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/155—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling
    • B23Q3/157—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling of rotary tools
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0092—Grinding attachments for lathes or the like
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2220/00—Machine tool components
    • B23Q2220/008—Rotatable tool holders coupled in parallel to a non rotating accessory

Definitions

  • the present invention relates to an exchangeable coolant supply device and a grinding tool having such a coolant supply device for a machine tool with a tool-carrying work spindle, in particular a milling machine.
  • grinding machines i.e. machine tools set up in particular for grinding
  • complex pipe constructions through which the coolant can be supplied to the desired location.
  • this is conducted on special machines, so called grinding machines.
  • An object of the present invention is to provide a coolant supply device and a grinding tool with a coolant supply device for a machine tool (in particular with a tool-carrying work spindle), which has a simple design and renders possible improved cooling.
  • the supply of the coolant from the coolant system of the machine tool to the processing area of the grinding tool shall be improved.
  • a further object of the invention is to provide a coolant supply device and a grinding tool having a coolant supply device for a machine tool (in particular with tool-carrying work spindle) by means of which it is possible in a flexible and accurate way to use the grinding tool e.g. on universal machine tools, milling machines/lathes, machining centers and/or milling machines with tool-carrying work spindle, wherein, on the one hand, simple, efficient and reliable inserting/exchanging operations can be carried out on the work spindle, in particular by means of automatic tool change apparatuses on the machine tool, and, on the other hand, a reliable, well positionable and easily manageable coolant supply is rendered possible.
  • the coolant supply device for a grinding tool of a machine tool in particular with a tool-carrying work spindle, such as a universal machine tool, a milling machine/lathe, of a machining center and/or a milling machine, is equipped with a main body which can comprise at least one engagement hole and/or at least one engagement portion.
  • a line unit which is connected to the main body can be provided with a coolant inlet and at least one discharge opening for discharging coolant to a predeterminable processing region.
  • the coolant supply device can have a clamping means for releasably securing the coolant supply device to a shaft of the grinding tool, wherein the coolant supply device can be secured to the machine tool via the engagement hole and/or the engagement portion.
  • a coolant supply device for a grinding tool for use on a machine tool with tool-carrying work spindle which has a main body that comprises at least one engagement portion, a line unit which is arranged on the main body and has at least one discharge opening for discharging coolant to a predeterminable processing area at the grinding tool, and a clamping device for releasably attaching the coolant supply device to the grinding tool.
  • the coolant supply device is expediently securable to a connector ring of the work spindle of the machine tool via the engagement portion and/or preferably a plurality of engagement portions, in particular if the grinding tool is accommodated on the work spindle of the machine tool.
  • the line unit has a coolant inlet which can be docked with a docking device arranged on the connector ring of the work spindle of the machine tool for supplying coolant, in particular if the coolant supply device is secured to the connector ring of the work spindle of the machine tool via the engagement portion.
  • the clamping device is configured to secure the coolant supply device to the grinding tool before the coolant supply device is secured to the connector ring of the work spindle of the machine tool via the engagement portion and/or if the coolant supply device is not secured to the connector ring of the work spindle of the machine tool via the engagement portion.
  • the clamping device is configured to release the coolant supply device from the securement to the grinding tool if the coolant supply device is secured to the connector ring of the work spindle of the machine tool via the engagement portion.
  • a gap is adjusted between the coolant supply device, in particular the clamping device, and the grinding tool in a state in which the coolant supply device is secured to the connector ring of the work spindle of the machine tool via the engagement portion and the line unit for supplying coolant is docked to the connector ring of the work spindle of the machine tool, preferably in particular in such a way that the grinding tool rotationally driven by the work spindle rotates and/or can rotate without contact with the coolant supply device secured in stationary fashion to the connector ring of the work spindle of the machine tool.
  • the clamping means and/or the clamping device of the coolant supply device can comprise a slide and a push means (docking element), wherein for securing the coolant supply device to the grinding tool the slide can engage at a first position in a first groove of the grinding tool, in particular in a first groove of the tool connection of the grinding tool and for releasing the coolant supply device, the slide can leave the groove at a second position so as to render possible a relative movement of the grinding tool to the coolant supply device.
  • the machine tool is preferably a milling machine, and therefore it is possible to process workpieces not only with milling processing steps but, by inserting the grinding tool, a grinding operation is also possible, wherein the workpiece does not have to be unclamped to be processed in a grinding machine. The entire processing with milling and grinding processing steps can thus be done while a workpiece remains clamped on the milling machine.
  • the push means (docking element) of the coolant supply device can advantageously be a tappet, and the clamping means (clamping device) can preferably comprise a spring which is in operative connection to the slide and the tappet.
  • the main body of the coolant supply device can have at least two engagement holes and/or engagement portions, and the engagement holes and/or engagement portions can be designed in such a way that the coolant supply device can be secured, and can in particular be secured in stationary fashion, to the connector ring of the work spindle (e.g. to a milling head) of the machine tool via clamping elements in the engagement holes and/or engagement portions. It is thus easily possible to clamp a combination tool comprising a grinding tool and a coolant supply device together on the milling machine.
  • the main body of the coolant supply device can advantageously have a central through-hole for receiving the shaft and/or the tool connection of the grinding tool on the coolant supply device.
  • the coolant supply device can have a coupling means (coupling device) for coupling the coolant supply device to a coolant circuit of the machine tool (in particular preferably a mechanically controllable, electrically controllable, hydraulically controllable and/or pneumatically controllable coupling device).
  • the coupling means (coupling device) thus renders possible the access to the coolant system of the machine tool.
  • the coupling agent and/or the coupling device is preferably configured to couple by means of the docking device to the connector ring of the work spindle of the machine tool, in particular in such a way that via the coupling of the coupling device the coolant inlet of the line unit can be supplied by means of the docking device with coolant from the coolant circuit of the connector ring of the work spindle.
  • the coupling means (coupling device) of the coolant supply device can advantageously comprise a docking cylinder which surrounds at least part of the coolant inlet.
  • a grinding tool for a machine tool in particular a milling machine and/or a machine tool with tool-carrying work spindle, can have a shaft, a grinding body provided on the shaft and a coolant supply device arranged on the shaft.
  • This combination tool renders possible to provide a grinding tool with a cooling apparatus, wherein a common insertion from a tool magazine of the machine tool is possible.
  • the shaft preferably has a workpiece connection to receive the grinding tool on the work spindle of the machine tool, wherein in particular the coolant supply device can preferably be secured to the tool connection of the grinding tool.
  • a tool connection can be made e.g. as a hollow shank taper, steep taper or Morse taper.
  • the coolant supply device of the grinding tool can advantageously be mounted on the grinding tool in floating fashion.
  • a contour part can be provided on the coolant supply device.
  • this contour part can engage in a guide groove of the shaft of the grinding tool, in particular in a groove of the tool connection, and, for mounting in a radial direction, the slide can engage in the first groove.
  • the coolant supply device in floating fashion if e.g. the grinding tool shall be moved together with the coolant supply device. This is the case if the grinding tool shall be clamped/unclamped together with the coolant supply device or if they shall be moved out of/into the tool magazine.
  • the grinding tool Before the processing operation begins, it is possible to release the mounting by forming a gap, such that the grinding tool can freely rotate and the coolant supply device remains fixedly or stationarily connected to the connector ring of the tool spindle and/or the spindle housing or milling head of the machine tool without co-rotating.
  • the clamping means (clamping device) of the grinding tool can secure the coolant supply device to the shaft of the grinding tool in a radial direction and in a release position can allow a rotation of the shaft about a longitudinal axis relative to the coolant supply device.
  • a rotation of the shaft about a longitudinal axis relative to the coolant supply device is thus blocked and is released in the release position.
  • the push means (docking element) can be actuated.
  • the shaft and/or the tool connection of the grinding tool can advantageously have a (first) groove into which the slide of the coolant supply device is guided, wherein the securing position the slide engages in the (first) groove of the grinding tool and in the release position the slide leaves the groove so as to render possible a relative movement of the grinding tool to the coolant supply device.
  • the discharge opening of the line unit of the grinding tool can be arranged in the grinding body region in such a way that a cooling lubricant can be supplied from the discharge opening to a work area of the grinding body for lubricating and/or cooling purposes, wherein the alignment and/or orientation of the discharge opening of the line unit can be adjusted in particular mechanically, electrically, pneumatically and/or hydraulically and/or the line unit is in particular releasably attached.
  • the grinding tool can additionally be provided for a milling head of a machine tool.
  • the push means of the grinding tool can advantageously be movable along a movement axis which is parallel to the longitudinal axis of the shaft.
  • a machine tool can be equipped with a work spindle which has a tool support and a connector ring which can be arranged in the area of the tool support.
  • the connector ring can have at least one inner line system for coolant and a clamping means, wherein a switching member can be provided for switching the coolant flow from the inner line system of the connector ring to a contactable coolant supply device.
  • a coolant supply device can be attached to the standard coolant circuit of the machine tool so as to render possible a switching depending on the processing operation.
  • the standard nozzles can be used for the coolant and during grinding it is possible, when connecting the coolant supply device, to switch to them in order to be able to supply the coolant directly to the grinding location.
  • a machine tool in particular a machine tool having a tool-carrying work spindle which has a tool support and a connector ring, which is arranged in the area of the tool support, wherein the connector ring has at least one inner line system for coolant and a clamping device for clamping at least one engagement portion of a coolant supply device according to at least one of the above aspects and wherein a switching member can preferably be provided on the connector ring in order to switch the coolant flow from the inner line system of the connector ring to a docking device (of the connector ring) for coupling to the coolant supply device.
  • the machine tool can comprise a tool changer and a tool magazine, wherein the tool changer can be configured to exchange a tool which is clamped on the work spindle with a tool from the tool magazine and wherein a grinding tool can be received together with the coolant supply device in the magazine and be inserted by the tool changer.
  • An automated insertion of the grinding tool including the attached coolant supply device is thus advantageously possible.
  • the combination tool comprising the coolant supply device and the grinding tool can be switched to the release position by the switching member when the combination tool is clamped in the work spindle by contacting the coupling means (coupling device). This serves to automatically switch from the standard coolant circuit to the coolant supply device when the combination tool is clamped/unclamped.
  • the coolant supply device of the machine tool can be switched with the grinding tool to the securing position when it is arranged in the tool magazine and to the release position when it is arranged on the work spindle.
  • the machine tool can be a milling machine.
  • it is advantageously possible to clamp a grinding tool with optimum cooling in the milling machine and at the same time to ensure optimized cooling at the grinding location without having to insert an additional cooling block. A separate grinding machine is therefore not necessary.
  • the clamping means (clamping device) of the connector ring can engage in the engagement holes and/or engagement portions of the coolant supply device and the coolant supply device can be pulled axially towards the connector ring, and in addition the grinding tool can be received at the support of the work spindle of the machine tool, wherein, as a result of the docking of the coolant supply device and the receiving of the grinding tool, a gap between the coolant supply device and the grinding tool can preferably be secured or adjusted.
  • a free rotation of the grinding tool is thus possible (e.g. with driven rotation by the rotating work spindle about the spindle axis), irrespective of the provided coolant supply device.
  • the tappet (docking element) of the machine tool can advantageously be actuated.
  • the switching member can advantageously have an inner cylinder and a switching sleeve guided on the inner cylinder, wherein for switching the coolant flow from the inner line system to the coolant supply device the switching sleeve is moved relative to the switching cylinder by a docking cylinder of the coupling means to release switching bores of the inner cylinder and redirect the coolant flow.
  • FIG. 1 shows, by way of example, a diagram of a conventional grinding tool on a work spindle of a machine tool
  • FIG. 2 shows, by way of example, a diagram of a grinding tool with a coolant supply device according to an embodiment
  • FIG. 3 shows, by way of example, a diagram of the grinding tool having a coolant supply device according to FIG. 1 on a work spindle of a machine tool according to an embodiment
  • FIG. 4 shows, by way of example, a diagram of the work spindle of the machine tool according to FIG. 3 without received grinding tool;
  • FIG. 5 shows, by way of example, a sectional view of the grinding tool with the coolant supply device according to FIG. 1 on the work spindle of the machine tool according to an embodiment
  • FIG. 6 shows, by way of example, a detailed view of the gap between grinding tool and coolant supply device according to FIG. 1 on the work spindle of the machine tool according to an embodiment
  • FIG. 7 shows, by way of example, a diagram of a grinding tool with a coolant supply device and a connector ring on a work spindle of a machine tool
  • FIG. 8 shows a further exemplary view of the connector ring of the work spindle of the machine tool
  • FIG. 9 shows an exemplary sectional view through the connector ring of the machine tool
  • FIG. 10 a shows, by way of example, an inner cylinder of the switching member of the connector ring of the machine tool
  • FIG. 10 b shows, by way of example, a switching sleeve of the switching member of the connector ring of the machine tool
  • FIG. 11 shows an exemplary sectional view of the switching member
  • FIG. 12 shows an exemplary grinding tool with a coolant supply device mounted thereon
  • FIG. 13 shows a further exemplary diagram of the grinding tool with the coolant supply device
  • FIG. 14 shows an exemplary detailed view of the clamping means of the coolant supply device.
  • FIG. 15 shows an exemplary view of the grinding tool with the coolant supply device in a tool magazine.
  • FIG. 1 shows, as an example, a diagram of a conventional grinding tool 200 on a work spindle 100 of a machine tool.
  • the work spindle 100 comprises a connector ring 110 around a tool support 130 , in which a tool connection (e.g. a hollow shank taper, steep taper or Morse taper) of a tool can be clamped, in particular to drive a rotation of the tool.
  • a tool connection e.g. a hollow shank taper, steep taper or Morse taper
  • AKZ AKZ
  • IKZ inner coolant supply
  • FIG. 1 shows a grinding tool 200 having a grinding wheel 210 on a shaft 220 , which is received and/or clamped on the tool support 130 of the work spindle 100 by means of the tool connection 221 (e.g. made as HSK or hollow shank taper).
  • the tool connection 221 e.g. made as HSK or hollow shank taper.
  • FIG. 2 shows, by way of example, a diagram of a grinding tool A 3 with a coolant supply device A 2 according to an embodiment.
  • the coolant supply device A 2 and the grinding tool A 3 form e.g. a combination tool of an embodiment.
  • the grinding tool A 3 has e.g. a grinding wheel A 3 b (grinding body) which is arranged on a shaft having a tool connection A 3 c with a gripper flute A 3 d (groove).
  • the tool connection A 3 c is again made e.g. as a hollow shank taper (HSK).
  • HSK hollow shank taper
  • tool connections can also be made differently, e.g. as steep tapers or Morse tapers.
  • the coolant supply device A 2 can be attached e.g. to the tool connection. However, it is also possible to attach the coolant supply device A 2 on the shaft above the tool connection.
  • the coolant supply device A 2 has e.g. a main body A 2 b , which has e.g. two protruding portions with respective engagement portions A 2 a (e.g. holes).
  • the coolant supply device A 2 also has e.g. a clamping device A 2 c for fixation to the tool connection A 3 c of the grinding tool A 3 .
  • the clamping device A 2 c When not clamped to the work spindle, the clamping device A 2 c preferably secures the grinding tool A 3 to the coolant supply device A 2 and/or the coolant supply device A 2 to the grinding tool A 3 .
  • the coolant supply device A 2 has e.g. a line unit A 1 with a discharge opening A 1 a for discharging coolant to the grinding wheel A 3 b , wherein the line unit A 1 is e.g. attached to a side of an inlet portion A 1 c on the main body and/or a portion of the engagement portions A 2 a of the coolant supply device A 2 .
  • the line unit A 1 is releasably attached (e.g. by means of a screw connection), in particular preferably for replacement with other, shorter, longer and/or differently shaped line units, e.g. for other tool forms (e.g. depending on the shaft length and/or grinding wheel thickness and/or diameter) or for maintenance purposes.
  • the line unit A 1 can also have flexible portions and/or joints which are manually moldable, bendable, slidable, adjustable in length or manually adjustable in any other way, e.g. for manually adjusting the position and/or alignment of the discharge opening A 1 a .
  • the line unit A 1 can additionally or alternatively have adjustment devices which render possible an electric, hydraulic, pneumatic or other adjustment of the position and/or alignment of the discharge opening A 1 a.
  • a nozzle adjustment of the discharge opening A 1 a being manually, electrically, pneumatically and/or hydraulically adjustable.
  • FIG. 3 shows, as an example, a diagram of the grinding tool A 3 with the coolant supply device A 2 according to FIG. 1 on a work spindle 100 of a machine tool according to an embodiment.
  • the connector ring B of the work spindle 100 has, in addition to the nozzles B 3 , additional clamping elements B 1 and a docking device B 2 .
  • the exemplary openings of the engagement portions A 2 a of the coolant supply device A 2 engage in the clamping elements B 1 of the connector ring B of the work spindle 100 where they are positioned and centered at the predetermined position.
  • a coupling device of the coolant supply device A 2 (described below) is coupled in this clamping state to a docking element of a docking device B 2 that is arranged on the connector ring B of the work spindle 100 , preferably to supply coolant from the cooling circuit of the outer coolant supply of the work spindle to the line element A 1 .
  • FIG. 4 shows, by way of example, a diagram of the work spindle of the machine tool according to FIG. 3 without accommodated grinding tool.
  • the connector ring B of the work spindle 100 is expanded by the clamping device with the clamping elements B 1 and the docking device B 2 in contrast to the conventional design according to FIG. 1 .
  • the docking device B 2 is connected to a coolant supply circuit of the connector ring B of the work spindle 100 and/or can preferably be connected by switching a valve.
  • FIG. 5 shows, by way of example, a sectional view of the grinding tool with the coolant supply device according to FIG. 1 on the work spindle of the machine tool according to an embodiment. It is here shown that the tool connection A 3 c is clamped in the tool support 130 and is pulled towards the work spindle.
  • the openings of the engagement portions A 2 a of the coolant supply device A 2 are in this case arranged e.g. on opposite sides, and the clamping elements B 1 of the clamping device of the connector ring B of the work spindle 100 engage in these, thus centering and positioning the coolant supply device A 2 at an accurate predetermined position on the connector ring B of the work spindle 100 when the grinding tool A 3 is received and clamped at the tool spindle 100 .
  • the clamping device A 2 c of the coolant supply device A 2 is configured in such a way that in the stationarily clamped state of the coolant supply device A 2 it releases the clamping of the grinding tool A 3 and a gap is adjusted between the grinding tool A 3 and the coolant supply device A 2 , in particular preferably between the tool connection of the grinding tool A 3 and the clamping device A 2 c of the coolant supply device A 2 .
  • FIG. 6 shows, by way of example, a detailed view of the above mentioned gap between grinding tool and coolant supply device according to FIG. 1 on the work spindle of the machine tool according to an embodiment.
  • FIG. 7 shows, by way of example, a diagram of a grinding tool having a coolant supply device and a connector ring on a work spindle of a machine tool.
  • FIG. 7 shows the grinding tool A 3 (and/or a grinding tool holder for receiving a grinding wheel), on which the coolant supply device A 2 (coolant supply device) is arranged.
  • the grinding tool A 3 which is connected e.g. to the coolant supply device A 2 , is referred to, by way of example, as combination tool A.
  • This combination tool A can be received e.g. in a tool magazine of a machine tool in designated receptacles or tool receptacles and can be automatically introduced and/or exchanged during the insertion via a tool changer of the machine tool (see FIG. 15 ).
  • the machine tool which can be in particular a machine tool having a tool-carrying work spindle (e.g. milling machine, universal machine tool, milling machine/lathe, machining center), and which in addition preferably comprises a tool change apparatus, can automatically remove the combination tool A from the tool magazine and can position, accommodate and clamp it on the work spindle of the machine tool and also exchange it again by means of the tool change apparatus and place it in the tool magazine or a receptacle of the tool magazine.
  • a tool-carrying work spindle e.g. milling machine, universal machine tool, milling machine/lathe, machining center
  • a tool change apparatus can automatically remove the combination tool A from the tool magazine and can position, accommodate and clamp it on the work spindle of the machine tool and also exchange it again by means of the tool change apparatus and place it in the tool magazine or a receptacle of the tool magazine.
  • the grinding tool A 3 is merely made by way of example with a hollow shank taper as a tool connection for accommodation in the work spindle.
  • the present invention is not limited to designs with hollow shank taper as a tool connection but it is also possible to use further tool connections, in particular e.g. steep tapers or Morse tapers in addition to the illustrated hollow shank taper.
  • Such tool connections usually have portions where the tool connection, e.g. for the tool change on the work spindle and/or for accommodation from the tool magazine can be gripped by a gripper device of the tool change device.
  • a gripper device of the tool change device e.g. for the tool change on the work spindle and/or for accommodation from the tool magazine
  • such a portion is merely made by way of example as a gripper flute on the hollow shank taper as a tool connection.
  • the connector ring B In order to connect the combination tool A to the work spindle of the machine tool, the connector ring B is provided which has clamping means (clamping portions and/or clamping elements) B 1 , to which the engagement portions and/or in particular the engagement holes of the coolant supply device A 2 can be docked.
  • the clamping means B 1 of the connector ring B are made e.g. as a drilling clamping mechanism which, for positioning and clamping the coolant supply device A 2 , are inserted in the engagement holes of the coolant supply device A 2 in order to position and clamp them.
  • the connector ring B of the machine tool also has e.g. the coolant supply elements B 3 (nozzles), which are the standard coolant supply nozzles of the machine tool.
  • the grinding tool A 3 is clamped and secured to the work spindle of the machine tool via the tool connection.
  • the shaft of the grinding tool A 3 preferably has an HSK (hollow shank taper) support as a tool connection for clamping on the work spindle.
  • HSK high shank taper
  • such an HSK has a tool connection body having a gripper flute and a support portion for receiving and clamping on the work spindle.
  • the coolant supply device is arranged on or attached to the tool connection body on the shaft of the grinding tool.
  • an element engage e.g. in the circumferential gripper flute of the tool connection body and secures the coolant supply device A 2 axially to the tool connection body on the shaft of the grinding tool A 3 .
  • a spring-loaded slide is provided which can engage in a lateral groove on the tool connection body to radially secure the coolant supply device A 2 .
  • the coolant supply device A 2 In order to clamp the coolant supply device A 2 via the engagement holes (engagement portions) on the connector ring B, it is positioned, centered and clamped e.g. via the two drilling clamping mechanisms (clamping elements and/or clamping means B 1 ).
  • the engagement holes of the coolant supply device A 2 are threaded into the clamping means B 1 (clamping elements and/or drilling clamping mechanisms).
  • a predetermined, circumferential gap is adjusted between the grinding tool (and/or the tool connection body) and the docked coolant supply device A 2 (see FIG. 6 ).
  • the slide of the clamping means A 2 c is also pressed out of the first groove A 3 e .
  • the coolant supply device A 2 is thus stationarily secured to the milling head or the connector ring B, and the grinding tool A 3 with the grinding body (grinding disk) can freely move on account of the gap.
  • further nozzles can be provided which introduce, inject and/or blow sealing air and/or coolant or lubricant on or in the gap in order to be able to avoid a friction-causing penetration of undesired dust and/or chip dirt into the gap.
  • the described connecting process between the combination tool A and the connector ring B is also referred to as docking.
  • the coolant supply from the standard coolant supply elements B 3 is switched to the introduced coolant supply device A 2 by a sliding mechanism which is available as a switching member B 2 (docking device).
  • a switching member B 2 (docking device).
  • the coolant supply is again automatically switched to the coolant supply element B 3 of the inner coolant circuit of the connector ring B of the machine tool.
  • the combination tool A which comprises the grinding tool A 3 and the coolant supply device A 2
  • the switching possibility by the switching member B 2 on the connector ring B of the machine tool it is possible to use a grinding tool on a milling machine, wherein the standard coolant supply of the milling machine can be advantageously tapped to convey the cooling lubricant to the grinding location of the grinding tool A 3 .
  • Individual coolant supply devices A 2 can be provided for different grinding tools A 3 with different grinding bodies, said coolant supply devices having an adapted line run so as to always position in optimum fashion the discharge opening for the cooling lubricant for the respective tool.
  • the alignment or orientation of the discharge opening can also be adjustable manually, electrically, pneumatically and/or hydraulically.
  • This combination tool A is markedly cheaper than the insertion of a separate nozzle block for the supply of the cooling lubricant.
  • no additional change unit and no additional coolant supply elements are necessary on the connector ring B of the machine tool to convey the cooling lubricant to the desired grinding location.
  • FIG. 8 shows a further exemplary view of the connector ring of the work spindle of the machine tool.
  • FIG. 8 illustrates, by way of example, the connector ring B.
  • This ring is provided on the machine tool in the area of the work spindle.
  • An inner coolant circuit is provided in the connector ring B.
  • the cooling lubricant is transported via this coolant circuit to the respective coolant supply elements B 3 , which are made in particular as nozzles.
  • the cooling lubricant is conveyed via these nozzles B 3 directly to the processing areas of the milling cutter.
  • this grinding tool typically has an elongated shaft.
  • such an elongated shaft is necessary to be able to process specific areas of the workpiece.
  • the standard coolant supply elements B 3 are, however, not sufficient. It is e.g. proposed to tap the inner cooling lubricant circuit (e.g. the AKZ) via the cooling lubricant switching member B 2 and to redirect the cooling lubricant from the coolant supply elements B 3 to convey it specifically to the grinding location via a coolant supply device A 2 .
  • the inner cooling lubricant circuit e.g. the AKZ
  • the cooling lubricant switching member B 2 is provided with an inner cylinder B 4 and a switching sleeve B 5 . If a hollow cylinder is pressed on this switching sleeve B 5 when the coolant supply device A 2 docks to the connector ring B, this switching sleeve B 5 moves inwards and releases upper switching holes Bob of the inner cylinder B 4 , such that the cooling lubricant can be conveyed from the connector ring B into the coolant supply device A 2 .
  • the clamping means B 1 are provided to attach the coolant supply device A 2 , said clamping means being in particular e.g. clamping bolts. These clamping bolts or clamping elements B 1 engage in the engagement holes (engagement portions) of the coolant supply device A 2 and secure them.
  • the connector ring B additionally has e.g. the support B 6 , which is e.g. a through hole, through which the end cap of the tool connection A 3 c of the grinding tool A 3 can be connected to the tool support 130 of the work spindle of the machine tool to apply the torque of the machine tool to the grinding tool.
  • the support B 6 which is e.g. a through hole, through which the end cap of the tool connection A 3 c of the grinding tool A 3 can be connected to the tool support 130 of the work spindle of the machine tool to apply the torque of the machine tool to the grinding tool.
  • FIG. 9 shows an exemplary sectional view through the connector ring of the machine tool.
  • FIG. 9 illustrates an exemplary section through the clamping means B 1 (clamping element) and the switching member B 2 of the valve device.
  • the switching member B 2 comprises e.g. a switching sleeve B 5 , which is forced out of the connector ring B via a spring B 8 .
  • the movement of the switching sleeve B 5 is limited via an inner cylinder B 4 , which is screwed into the connector ring B.
  • the cooling lubricant is supplied to the coolant supply elements B 3 via the inner cooling lubricant circuit B 9 to ensure an appropriate coolant supply during the milling operation of the machine tool.
  • the switching sleeve B 5 is pressed into the connector ring B against the spring force of the spring B 8 for the grinding operation of the milling machine in order to release the upper switching hole of the inner cylinder B 4 and simultaneously close the lower switching hole B 4 a of the inner cylinder Bob.
  • This closure serves to block a supply of the coolant to the inner cooling lubricant circuit B 9 .
  • the cooling lubricant can here be supplied via the cooling lubricant circuit B 7 .
  • FIG. 10 a shows, by way of example, an inner cylinder of the switching member of the connector ring of the machine tool and FIG. 10 b shows, by way of example, a switching sleeve of the connector ring of the machine tool.
  • FIG. 10 a and FIG. 10 b show in detail the inner cylinder B 4 and the switching sleeve B 5 .
  • the inner cylinder B 4 of the switching member B 2 has a covering surface B 4 c , which has a larger diameter than the remaining cylinder body to thus delimit, as an upper stop for the switching sleeve B 5 , the axial movement of the switching sleeve from the connector ring B.
  • the inner cylinder B 4 is e.g. hollow and, for a redirection of the cooling lubricant, has an inner space B 4 f and lower switching holes B 4 a and upper switching holes Bob.
  • the base area of the inner cylinder B 4 e.g. the bottom area B 4 e is provided which serves as a connection point to the cooling lubricant circuit of the machine tool, wherein a phase B 4 d (e.g. thread recess) is provided in addition in the base area of the inner cylinder B 4 .
  • the switching sleeve B 5 has an inner sliding surface B 5 b , along which the switching sleeve B 5 glides along the outer surface of the inner cylinder B 4 .
  • the inner gliding surface B 5 b has, on the front side of the switching sleeve B 5 , a step which is designed as a counter member of the cover surface B 4 c of the inner cylinder B 4 in order to confine the axial movement of the switching sleeve B 5 .
  • the outer gliding surface B 5 d of the switching sleeve B 5 glides in the connector ring B 5 .
  • the switching sleeve B 5 also has the supply holes B 5 c for switching the cooling lubricant flow.
  • the inner cylinder B 4 also has preferably in each case four lower switching holes B 4 a and four upper switching holes Bob, which are arranged symmetrically along the circumference in a plane of the inner cylinder B 5 .
  • FIG. 11 shows an exemplary sectional view of the switching member.
  • FIG. 11 depicts a sectional view of the inner cylinder B 4 , which is introduced into the switching sleeve B 5 .
  • the step of the cover surface B 4 c is here in contact with the inner gliding surface B 5 d of the switching sleeve B 5 .
  • the switching sleeve B 5 additionally has the contact surface B 5 a where the coupling means of the coolant supply device A 2 engages to displace the sleeve during the docking operation to the connector ring B 4 .
  • the upper switching hole Bob is released and the lower switching hole B 4 A is thus blocked.
  • the lower switching hole B 4 a is blocked by displacing the sleeve into the base area of the inner cylinder, such that the supply hole B 5 c is no longer overlapped with the lower switching hole B 4 a .
  • a thread B 4 g is provided e.g. on the inner cylinder B 5 .
  • FIG. 12 shows an exemplary grinding tool with a coolant supply device mounted thereon.
  • FIG. 12 shows the combination tool A, which is composed of the grinding tool A 3 and the attached coolant supply device A 2 .
  • the coolant supply device A 2 comprises a main body A 2 b , which has an outlet opening in the center, through which the shaft A 3 a of the grinding tool A 3 is passed.
  • the main body A 2 b has radial projections A 2 d (radial offset on both sides).
  • the radial projections A 2 d are preferably arranged on opposite sides to improve the power transmission to the connector ring B in the docked state.
  • the radial projections A 2 d (radial offset) have engagement holes A 2 a , through which the clamping means B 1 of the connector ring B can be passed through to secure the main body A 2 b.
  • the clamping means A 2 c is provided at the grinding tool A 3 .
  • the clamping means A 2 c is arranged in a circumferential region of the main body A 2 b.
  • the shaft A 3 a of the grinding tool A 3 has e.g. the guide groove A 3 d , which guides a contour part A 2 h for the floating support of the coolant supply device A 2 .
  • the clamping means A 2 c additionally has a mechanism, via which it is possible to radially secure the grinding tool A 3 with respect to the coolant supply device A 2 .
  • the shaft A 3 a of the grinding tool A 3 has a grinding tool attachment A 3 c .
  • This grinding tool attachment A 3 c can introduce the rotary motion of the machine tool into the shaft A 3 a via a groove.
  • Such a drive groove can be provided in particular in the case of hollow shank taper tool connections.
  • Other tool connections can also have other or different drive portions.
  • the grinding body A 3 b which is preferably a grinding wheel, is provided on the front side of the shaft A 3 a .
  • a processing area A 3 c is also provided on the grinding body A 3 b and is intended for contacting a workpiece.
  • the discharge opening A 1 a of the coolant supply device A 2 is directed to this processing region A 3 c .
  • the coolant is conveyed from a docking cylinder A 1 d , which can be contacted with the switching member B 2 of the connector ring B and via which the cooling lubricant is supplied in the line unit A 1 , via the line unit A 1 and along the longitudinal pipe A 1 b to the discharge opening A 1 a.
  • the cooling lubricant is thus conveyed from the cooling lubricant circuit of the milling machine (machine tool) towards the discharge opening A 1 a via the docking cylinder A 1 d to optimally provide the grinding location cooling lubricant.
  • the longitudinal pipe A 1 b of the line unit A 1 is secured via the fixation A 1 c.
  • FIG. 13 shows a further exemplary diagram of the grinding tool with the coolant supply device.
  • FIG. 13 shows the combination tool A.
  • the cooling lubricant inlet Ale is provided, which is arranged in the cavity of the docking cylinder A 1 d .
  • the docking cylinder A 1 d has contact surfaces which serve to press the switching sleeve of the switching member B 2 into the connector ring B to tap the cooling lubricant from the connector ring B and pass it on to the discharge opening A 1 a via the longitudinal pipe A 1 b.
  • the clamping means A 2 c has a tappet A 2 e (docking element), which is pressed into the clamping means A 2 c when contacting the combination tool A with the processing unit of the machine tool so as to release the radial movement of the grinding tool A 3 (i.e. the shaft A 3 a and the grinding body A 3 b ), such that the grinding tool A 3 can rotate independently of the coolant supply device A 2 .
  • a tappet A 2 e docking element
  • the tappet A 2 e is pressed into the clamping means A 2 c when the combination tool A docks to the connector ring B here via the contacting element B 10 .
  • the contacting element B 10 preferably has a tongue which is made as a rigid lever. This rigid lever presses the tappet A 2 e into the clamping means A 2 c , such that the radial movement of the grinding tool A 3 can be released since the slide A 2 g can move out of the axial groove A 3 c . This adjusts the above described gap (see FIG. 6 ).
  • FIG. 14 shows an exemplary detailed view of the clamping means of the coolant supply device.
  • FIG. 14 shows a sectional view of the clamping means A 2 c .
  • the tappet A 2 e is pressed into the clamping means A 2 c against the spring A 2 f to thus move the slide A 2 g fixedly connected to the tappet A 2 e out of a first groove A 3 e (axial groove).
  • the tappet A 2 e (docking element) has entered the clamping means A 2 c to such an extent that the slide A 2 g has fully left the first groove A 3 e and a rotation of the shaft A 3 a is possible without blocking by the slide A 2 g.
  • the floating support of the coolant supply device A 2 on the grinding tool A 3 is also achieved via the contour part A 2 h .
  • the contour part A 2 h has a projection, which is adapted in a second groove A 3 d (radial groove) and is spaced apart therefrom at a small distance, preferably 0.5 mm.
  • the contour part A 2 h has an opening in which the spring A 2 f is arranged and through which the tappet A 2 e is passed to be connected to the slide A 2 g via a screw connection.
  • the side wall A 2 j of the main body A 2 b is connected to the contour part A 2 h .
  • the contour part A 2 h is preferably screwed to the side wall A 2 j of the main body A 2 d and secured via a cover A 2 i.
  • FIG. 15 shows an exemplary view of the grinding tool A 3 having the coolant supply device A 2 (combination tool A) in a tool magazine 300 of the machine tool.
  • the tool magazine 300 (shown only as a partial view) is made e.g. as a wheel magazine, with a wheel 320 , where a plurality of tool receptacles 309 , 310 and 311 are arranged.
  • the grinding tool A 3 with coolant supply device A 2 is received and held at the tool receptacle 310 by means of the tool connection.
  • the engagement portions of the coolant supply device A 2 are arranged via the adjacent tool receptacles 309 and 311 and can be positioned there also by means of additional centering elements.
  • These tool receptacles 309 and 311 are preferably kept free but other tool receptacles of the tool magazine can be provided conventionally with other tools.
  • the grinding tool A 3 with the coolant supply device A 2 is held at the tool magazine in such a way that it is rotated by 180° compared to the clamping situation on the work spindle so as to be inserted at the work spindle with proper orientation in the case of a rotation by 180° by means of a gripper of a tool change apparatus.
  • the gripper flute of the tool connection can always be gripped or be free for being gripped by means of a gripper of a tool change device at both the work spindle and the work spindle, at least on the side opposite the clamping device A 2 c , such a combination tool can be inserted and exchanged advantageously in an easy and reliable way and in fully automated fashion with tool change apparatuses known to date.
US15/701,907 2016-09-12 2017-09-12 Coolant supply device and grinding tool having a coolant supply device for a machine tool Abandoned US20180071892A1 (en)

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DE102016217344.8A DE102016217344A1 (de) 2016-09-12 2016-09-12 Kühlmittelzufuhreinrichtung und schleifwerkzeug mit einer kühlmittelzufuhreinrichtung für eine werkzeugmaschine
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KR20180029917A (ko) 2018-03-21
EP3292950B1 (de) 2022-08-24
DE102016217344A1 (de) 2018-03-15
ES2926782T3 (es) 2022-10-28

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