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
  • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
  • B24B53/12—Dressing tools; Holders therefor
• • 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
  • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
  • B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
• • 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
  • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
  • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
  • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
  • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
  • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
  • B24B9/107—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass for glass plates while they are turning

Definitions

• the invention relates to a dressing device for dressing a provided with a predetermined grinding profile grinding tool and a method for dressing a grinding tool by means of at least one such dressing device.
• Grinding tools must be dressed in the grinding insert after a certain period of time, with several processes being differentiated during dressing.
• One of these processes is to sharpen the grinding profile of the grinding tool. In doing so, e.g. Removing impurities, removing dulled abrasive grains, revealing new abrasive grains, and / or abrasive grains, e.g. by breaking, sharpened.
• Another process is to restore the grinding profile of the grinding tool.
• binder material, abrasive deposits and / or abrasive grains are removed, with the aim of restoring the specified grinding profile of the grinding tool.
• the object of the present invention is to provide a comparison with the prior art improved dressing, which in particular allows an increased service life of abraded with the dressing grinding tool. Another object is to provide a method for dressing a grinding tool by means of at least one such dressing device, which in particular allows efficient dressing of a grinding tool and an increased service life of the grinding tool.
• the dressing device comprises at least a first dressing area and a second dressing area connected thereto, the first dressing area having a first specification for sharpening the grinding profile of the grinding tool and the second dressing area being a second specification deviating from the first specification Restoring the grinding profile of the grinding tool, the first dressing region has a larger volume than the second dressing region, the dressing device has a longitudinal axis, the two dressing regions are arranged one behind the other in the direction of the longitudinal axis, and the dressing device is formed substantially cuboid.
• the dressing device comprises at least two dressing areas, wherein one of the two dressing areas is optimized for the process of restoration of the grinding profile and the other of the two dressing areas for the process of sharpening.
• one of the two dressing areas is optimized for the process of restoration of the grinding profile and the other of the two dressing areas for the process of sharpening.
• the specific dressing area is used specifically. In tests it has been found that the service life of the grinding tool dressed with such a dressing device can be almost doubled compared to a dressing device where a compromise in design between the restoration and sharpening processes is concluded.
• Another advantage is the fact that the two dressing areas are interconnected.
• two different dressing devices each with a dressing area, with one of the two dressing devices being responsive to the process of restoring the abrasive profile and the other of the two dressing devices to the process of sharpening is designed.
• the two dressing devices would then have to be used alternately, which is associated with an increased positioning effort.
• it is possible in the present dressing device this only once, for example, in a feeder to position, and at first consume the second and then the first dressing area at least for the most part. In this way, an alternation between the process of restoration of the grinding profile and the process of sharpening automatically takes place without the position of the dressing device having to be changed relative to the feeding device.
• the dressing device has a longitudinal axis, and the two dressing areas are arranged one behind the other in the direction of the longitudinal axis.
• the dressing device is substantially cuboid-shaped, preferably with a length of 150 mm to 250 mm, particularly preferably 180 mm to 200 mm, and / or a width of 25 mm to 75 mm, more preferably about 50 mm, and / or a thickness of 2.0 mm to 10.0 mm, more preferably about 3.0 mm, 4.0 mm or 5.5 mm.
• the dressing device it is also advantageous for the dressing device to have a holding region for holding the dressing device during dressing of the grinding tool, preferably wherein the holding region is formed without a grinding wheel and / or glued or sintered, and / or consists essentially of a water-soluble material. Without this holding area, the dressing device would have to be held on one of the two dressing areas, which would no longer be usable for dressing in the area used for holding and would have to be disposed of as waste.
• the holding area only after the production of the two dressing areas, for example by gluing. It can be used a variety of materials, such as wood, plastic or organic materials. Prerequisite is sufficient strength and the possibility of bonding with the dressing areas.
• the material of the holding area is water-soluble, one could easily dispose or recycle the holding area after its use by dissolving it in water.
• the first dressing area has a larger volume than the second dressing area, an optimum ratio between the dressing step of the profiling and the dressing step of the sharpening can be set.
• a grinding tool is profiled at a lower frequency than sharpened, and that during profiling, a smaller volume of dressing material is consumed compared to sharpening.
• the volume of the first dressing region is approximately 4 to 7 times, preferably approximately 6 times, greater than the volume of the second dressing region.
• the specification of the first and second dressing range depends on the specific design of the grinding tool and the specific application of the grinding tool. In general, the specification of the second dressing area will be made more aggressive than the specification of the first dressing area, whereby the specification of the second dressing area is designed to remove more abrasive grains and / or binder material compared to the specification of the first dressing area.
• the first specification has a mean pore size of 200 to 500 miti, preferably about 350 miti, and / or has corundum white as abrasive grain, and / or an abrasive grain with a grain size of 120 to 220 mesh, preferably about 180 mesh ,
• the second specification has a porosity in the range of 10 to 15 percent by volume, and / or has a mixture of corundum white and corundum pink and / or corundum red as abrasive grain, and or an abrasive grain having a grain size of 35 to 100 mesh, preferably about 55 mesh.
• Corundum consists of more than 99.9% Al2O3 (aluminum oxide) and has a high hardness and heat resistance up to 2000 ° C. Corundum pink has low levels of impurities which give it a slightly higher grain toughness and allow its use for shape and profile grinding due to higher edge strength. Otherwise it corresponds to the corundum white.
• impurities for example, chromium or titanium are added as oxide in the melting process. In the event that chromium oxide is added as foreign substance, it is possible to differentiate corundum-pink and corundum-red from one another in that noble corundum-pink in about 0.25% Cr 2 O 3 and noble corundum red in about 2% Cr 2 O 3 contains.
• protection is also desired for a method for dressing a grinding tool by means of at least one dressing device according to the invention, the method comprising a first method step in which the grinding profile of the grinding tool is restored by means of the second dressing region of the at least one dressing device, and a second method step, in which the grinding profile of the grinding tool is sharpened by means of the first dressing region of the at least one dressing device.
• the first method step preferably takes place before the second method step.
• the two process steps can also be carried out in reverse chronological order.
• the first method step is repeated before performing the second method step with a first frequency N1 and the second method step is repeated after the first method step repeated at the frequency N1 has been repeated with a second frequency N2, where N1 ⁇ N2 ,
• the first method step is carried out or repeated before the second method step is carried out until at least a predominant part of the second dressing zone has been used up and the second method step is carried out or repeated after the first method step has been completed, until at least a major part of the first dressing area has been used up.
• the second method step is carried out or repeated after the first method step has been completed, until at least a major part of the first dressing area has been used up.
• the dressing device has a holding region for holding the dressing device during dressing of the grinding tool and the at least one dressing device is held at least on the holding region in a feeding device at least during the first and second process steps, and / or
• the method is carried out sequentially with a plurality of successive dressing devices, wherein a further dressing device, preferably from a magazine, is supplied as soon as a preceding dressing device is at least predominantly used up, and / or
• 1a is a perspective, schematic representation of an arrangement of a workpiece, a grinding tool and a dressing device
• 1 b is a schematic representation of a grinding process of a workpiece in a side view, wherein the dressing device shown is disengaged
• 1 c is a schematic representation of an arrangement of a workpiece and a grinding tool in a side view before the beginning of a grinding process
• 1d is a schematic representation of an assembly of a workpiece and a grinding tool in a side view during a grinding process
• FIG. 2a shows a first preferred embodiment of a dressing device in a perspective, schematic representation
• FIG. 2b shows a second preferred embodiment of a dressing device in a perspective, schematic representation
• FIG. 3 is a perspective, schematic representation of an arrangement of a grinding tool and two dressing devices in a first embodiment
• Fig. 4a is a schematic representation of an arrangement of a
• Fig. 4b is a schematic representation of an arrangement of a
• Fig. 4c is a schematic representation of an arrangement of a
• Fig. 5 is a schematic, enlarged view of a part of a
• FIG. 6a is a schematic representation of the dressing step of profiling a grinding tool by means of a dressing device in a side view
• Fig. 6b is a schematic representation of the dressing step of sharpening a
• Fig. 7 shows a method for dressing a grinding tool, which for
• Machining a workpiece is used by means of at least one dressing device in a schematic representation.
• Figure 1 a shows a grinding tool 2, which is rotatably mounted about a rotation axis 33.
• the grinding tool 2 has a groove-shaped grinding profile 14 with which the edge 51 of a workpiece 15 in the form of a glass pane can be ground.
• the invention is of course not limited to the dressing of a groove-shaped grinding profile of a grinding tool.
• the workpiece 15 is adjustable and rotatably mounted in all spatial directions 52. Furthermore, a feed device 16 is provided, in which a dressing device 1 is mounted. The dressing device 1 is held in a form-fitting manner in the feed device 16. In addition, a hold-down 30 is provided for holding the dressing device 1.
• the workpiece 15 can be arranged on a support 32, for example via flattening devices 31, wherein the flanging devices 31 and / or the support 32 can be adjustable in the spatial directions 52.
• the grinding tool 2 can be clamped in a clamping device 28 of a grinding machine 26.
• FIGS. 1 c and 1 d schematically illustrates the process of grinding the edge 51 of the workpiece 15 by means of the grinding tool 2.
• the edge 51 of the workpiece 15 is spaced from the grinding profile 14 of the grinding tool 2.
• the grinding profile 14 of the grinding tool 2 is in engagement with the edge 51 of the workpiece 15.
• material of the workpiece 15 is removed relative to the workpiece 15 by a relative movement of the grinding profile 14 and abrasive grains 13 contained therein.
• the dressing device 1 has a first dressing area 3 and a second dressing area 4 connected thereto, the first dressing area 3 having a first specification for sharpening the grinding profile 14 of the grinding tool 2 and the second dressing area 4 being one of second specification for restoring the grinding profile 14 of the grinding tool 2, and wherein the first dressing region 3 has a larger volume than the second dressing region 4.
• the dressing device 1 is substantially cuboid-shaped, wherein the length of the dressing device 1 is provided with the reference numeral 6, the width with the reference numeral 7 and the thickness with the reference numeral 8.
• the dressing device 1 has a longitudinal axis 5.
• the two dressing areas 3 and 4 are arranged one behind the other in the direction of the longitudinal axis 5.
• the dressing device 1 has an additional holding region 9 for holding the dressing device 1 during dressing of the grinding tool 2 in comparison to the first preferred embodiment, wherein the holding region 9 is formed without a grinding wheel.
• the dressing device 1 according to the first preferred embodiment can also be held during dressing, for example at the dressing area 3, as can be seen inter alia in FIG.
• the feed device 16 comprises a magazine 17 for two dressing devices 1, which are arranged one behind the other in the magazine 17 in the direction of the longitudinal axis 5 of the dressing devices 1.
• One of the dressing devices 1 protrudes a distance out of the feeding device 16.
• This dressing device 1 is now used first for dressing the grinding tool 2, and that until the dressing device 1 is used up so far that they do not can be held more in the feeder 16. After that, the dressing device 1 arranged behind it is used for dressing the grinding tool 2.
• the resulting in the magazine 17 blank can be filled by a further dressing device 1.
• the feed device 16 comprises a magazine 17 which, in comparison to the magazine shown in FIG. 3, has on the one hand a loading device 27 for reloading the dressing devices 1 and an actuator 25 for advancing the dressing devices 1 in the direction of the grinding tool to be dressed 2 has.
• dressing devices 1 according to the second preferred embodiment are arranged in the magazine 17.
• dressing devices 1 according to the first preferred embodiment can also be arranged in the magazine 17.
• a collecting device 29 is provided in which unused residual pieces of the dressing devices 1 can be collected. If the dressing devices 1 according to the second preferred embodiment are concerned, the remnants consist essentially of the holding regions 9 of the dressing devices 1. If the dressing devices 1 according to the first preferred embodiment are concerned, the remnants consist essentially of sections of the dressing regions 3 and / or 4.
• FIG. 4b shows an embodiment in which the feed device 16 can be adjusted by means of a manual feed 18, for example in the form of a spindle drive, in the direction of the grinding tool 2 or in the opposite direction.
• a manual feed 18 for example in the form of a spindle drive
• FIG. 4 c shows an embodiment in which the dressing devices 1 can be conveyed fully automatically from the magazine 17 into an active dressing position by means of an actuator 25, which is actuated by an automatic feed machine. Furthermore, a detection device 24 is provided, with which the stock of dressing devices 1 in the magazine 17 can be detected. And finally, a control and / or regulating device 20 is provided, which communicates at least with the detection device 24 and the automatic feeder 19.
• Figure 5 shows a schematic, enlarged view of a part of a dressing device 1.
• the dressing area 4 comprises a specification for restoring the grinding profile of a grinding tool, this specification having a porosity in the range of 10 to 15 percent by volume and a mixture of fine corundum white and precious corundum pink and / or red corundum as abrasive grain having a grain size of about 55 mesh.
• the dressing area 3 comprises a specification for sharpening the grinding profile of a grinding tool, this specification having an average pore size of about 350 ⁇ m and fine corundum white as abrasive grain having a grain size of about 180 mesh.
• FIG. 6a schematically shows the dressing step of profiling a grinding tool 2 with a dressing device 1, wherein the grinding tool 2 comes into contact with the dressing region 4.
• the dressing area 4 is used up until the grinding tool 2 comes into contact with the dressing area 3 (compare FIG. 6b) and the dressing step of the sharpening automatically takes place. It is advisable to repeat the process step of restoring the grinding profile of a grinding tool with a frequency N1 and the step of sharpening with a frequency N2, where N1 ⁇ N2.
• the change from restoring the sanding profile to sharpening is also shown again schematically in the upper part of FIG.
• the lower part of Figure 7 illustrates the option that the grinding tool 2 before the first process step 11, and / or between the first and second process steps 11 and 12, and / or after the second process step 12, and / or between an optionally provided repetition of the first or second method step 11 and 12 can be used several times for grinding at least one workpiece 15, preferably a glass pane.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Inorganic Chemistry (AREA)
• Grinding-Machine Dressing And Accessory Apparatuses (AREA)

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Applications Claiming Priority (2)

Related Child Applications (1)

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Citations (5)

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• 2018
  • 2018-03-20 PL PL18162816T patent/PL3542959T3/pl unknown
  • 2018-03-20 EP EP18162816.5A patent/EP3542959B1/de active Active
  • 2018-03-20 ES ES18162816T patent/ES2899451T3/es active Active
• 2019
  • 2019-03-01 WO PCT/EP2019/055170 patent/WO2019179751A1/de active Application Filing
• 2020
  • 2020-08-31 US US17/007,606 patent/US20200391347A1/en not_active Abandoned

Patent Citations (5)

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