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
  • B24B37/00—Lapping machines or devices; Accessories
  • B24B37/11—Lapping tools
  • B24B37/20—Lapping pads for working plane surfaces
  • B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
  • B24D5/02—Wheels in one piece
  • B24D5/04—Wheels in one piece with reinforcing means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
  • B24D5/12—Cut-off 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
  • B24D7/02—Wheels in one piece
  • B24D7/04—Wheels in one piece with reinforcing means
• • 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
  • B24D7/18—Wheels of special form

Definitions

• the invention relates to a resin-bonded grinding wheel, in particular a cutting disc or a roughing disc.
• Resin-bonded grinding wheels are used for cutting (cutting) or roughing (roughing) machining of workpieces. They consist u.a. a resin-reinforced fabric composite in which abrasive grains are incorporated, wherein the abrasive grains cause the exciting lifting of the material from the workpiece. With the roughing discs a surface machining of the workpiece is possible. Because of the higher lateral load on the surfaces, the material of
• a main task of the reinforcement fabric is to ensure the stability and, not least, the safety of the grinding wheel.
• safety is of particular importance, since the operator inevitably in contrast to stationary machines during processing
• Each reinforcement fabric initially serves to support the torque input from the clamping flange into the grinding wheel. It is essential that each reinforcing fabric protrudes into the region of the grinding wheel on which the clamping takes place with the clamping flange. For forwarding the torque up to the radially outer areas of the
• Reinforcing fabric two reinforcing fabrics radially inside, one reinforcing fabric radially outside. When implemented, this means that the second reinforcing fabric covers only the radially inner region, but not the radially outer region. Thus, depending on the design per slice up to about 35% of the reinforcing fabric can be saved, which means a considerable cost savings potential. In principle, such disks are also included, in which the base area of the first reinforcement fabric is slightly smaller than that, in particular due to production
• Armismesgewebe has in particular a circular shape.
• the second reinforcing fabric must be arranged only in the radially inner region.
• a circular form is not important here; Rather, other forms are conceivable.
• the second Reinforcing fabrics can be chosen for shapes that enable jam-free production, such as rectangular shapes or interlocking shapes, such as star or triangular shapes. Under the base is doing in
• a diameter of the first reinforcing fabric may correspond to the nominal diameter of the grinding wheel.
• a diameter of the second reinforcement fabric is significantly smaller than the nominal diameter of the abrasive wheel, in particular at least 10%, preferably at least 20% or 40% smaller than the nominal diameter.
• the base area of the second reinforcement fabric is preferably also significantly smaller, preferably at least 15%, in particular at least 20% or at least 50% smaller than the base area of the grinding wheel.
• the grinding wheel comprises only the first and the second reinforcing fabric as reinforcement fabric.
• this arrangement is sufficient.
• the amount of reinforcing fabric to be used here is significantly reduced to previous solutions, with at least single-layer full-surface coverage of the grinding wheel. This option is applicable to cut-off wheels and roughing wheels, in particular to roughing wheels if they have a maximum thickness of 10 mm.
• the grinding wheel comprises as the reinforcing fabric only the first, the second reinforcing fabric and a third reinforcing fabric.
• This variant is particularly applicable to fairly thick roughing discs with a thickness of
• the first reinforcing fabric that is to say that with the large surface
• the second reinforcing fabric ie the one with the smaller area
• the reinforcing fabric is obstructive in schruppenden contact with the workpiece rather.
• the reinforcement fabric does not disturb the roughing process.
• a resin-bonded cutting wheel is in particular an un-cranked and level
• the thickness of a cutting disc, which defines the cutting width significantly, is in particular a maximum of 4 mm, preferably a maximum of 3 mm.
• the invention further relates to a process for producing a resin-bound
• the peculiarity of the method lies in the fact that a surface layer is first placed on the bottom of the mold, in particular a paper fabric or non-woven fabric, onto which the one to be inserted at the bottom
• the surface layer also has a circular outer contour and a base area that largely corresponds to the base of the grinding wheel.
• Figure 1 shows a known machine tool with attached cutting disc
• Figure 2 shows an inventive arrangement with a machine tool according to
• Figure 3 shows an inventive arrangement with a machine tool according to
• Figure 4 shows an inventive arrangement with a machine tool according to
• Figure 6 shows a mold during the production of a novel
• FIG. 1 shows a known, hand-guided machine tool in the form of a
• Angle grinder 1 shown This comprises a housing 2 with handles 6, 7, on which an operator leads the angle grinder 1 during a work operation with both hands.
• the angle grinder 1 further has a drive shaft 3, which is mounted in the housing 2.
• a grinding wheel On the drive shaft 3 is a grinding wheel, in the present case a Cutting disc 9 'attached, the use of a roughing disc is also possible.
• About a power line 8 of the angle grinder 1 receives electrical energy.
• a machine tool can also be driven by other sources of energy, for example pneumatically or hydraulically.
• the term housing is to be understood widely and may also include internal support structures of the machine tool.
• that axial side of the grinding wheel 9 which faces the machine tool is referred to as the upper side 17.
• the other side is the underside 18.
• the underside In the case of a roughing disc, the underside is the side with which the disc is in rough contact with the workpiece to be machined.
• FIG 2 shows an inventive arrangement with a machine tool, for example, the angle grinder of Figure 1, and a grinding wheel according to the invention in the form of a cutting disc 9 '.
• the cutting disc 9 ' is frictionally secured by means of a clamping flange 4 to the drive shaft 3 of the angle grinder 1.
• a drive torque is thus introduced from the drive shaft 3 into the cutting disk 9', which is to be transferred to the entire cutting disk 9 'and, in particular, to be guided radially outwards.
• the central that is to say radially inner region 19, in operation there are consequently large stresses within the cutting disk 9 'which must be distributed over the entire cutting disk 9'.
• the first reinforcing fabric 1 1 is circular and has a diameter D1, which corresponds to a nominal diameter N of the blade 9 '.
• the base of the first Arm istsgewebes 1 1 also corresponds to the base of the blade 9 '.
• the second reinforcing fabric 12 is formed smaller in diameter and has a diameter D2 of only 55% of the nominal diameter N of the substantially Cutting disc 9 '.
• the second reinforcing fabric 12 has essentially the task of basically supporting the transmission of the torque from the clamping flange 4 in different areas of the disc. For the further distribution of the torque in the peripheral region, however, it has proved to be sufficient that this is supported only by a reinforcing fabric, namely the first reinforcing fabric.
• the advantage over conventional resin-bonded cutting discs is now in the material savings, since only a large layer and a small layer of reinforcing fabric is to be used instead of two large layers of reinforcing fabric.
• the reduction to only one reinforcing fabric, which extends to the outer circumference, has the following additional advantage.
• the reinforcement fabric can bring stability in the disc, but it has no abrasive effect.
• the robustness of the reinforcing fabric can have an adverse effect on the separating process, for example, the movement of the disc is slowed down by the tissue. This basically also applies to roughing. Due to the reduction of the size of the second disc, the outer circumference is now only one
• the thickness B of the cutting disc is about 2 mm and is suitable for producing quite thin cuts.
• Arm istsgewebe is provided on the bottom 18, which represents the operator facing away from the axial (relative to the drive shaft) side of the cutting disc.
• An axially pulling action by the operator is rather rare, so that the reduced reinforcing fabric on the top 17 in terms of
• Figure 3 shows an alternative embodiment, wherein instead of the cutting disc 9 'now a cranked grinding disc 9 "is mounted on the angle grinder 1.
• the first reinforcing fabric 11 corresponds to the base of the roughing wheel 9 "
• the second reinforcing fabric 12 has a significantly smaller base area, it being significant that the underside 18 is in contact with a workpiece to be machined , is provided with the smaller second reinforcing fabric 12.
• the second is
• the reinforcing fabric is a hindrance during the roughing process and should therefore not come into contact with the workpiece.
• the thickness B of the scrubbing wheel 9 is approximately 8mm.
• FIG. 4 shows a development of the embodiment according to FIG. 3.
• a third reinforcement fabric is arranged between the first and the second reinforcement fabric 11, 12. Also, this third reinforcing fabric 13 has a much smaller
• the third reinforcing fabric 13 is further provided only in the radial inner region 19, in which the
• the thickness B of the roughing disc 9 " is about 9 mm.
• Reinforcing fabric 12 is shown.
• FIG. 5a shows the first reinforcement fabric and the second reinforcement fabric in FIG.
• the second reinforcing fabric 12 has a smaller diameter D2 than that
• FIG. 5b shows an alternative form.
• the second reinforcing fabric 12 is formed by a rectangle, in the present case a square.
• the rectangular shape has the advantage that the corresponding reinforcement fabric can be produced without any rejects. In contrast, rejects are inevitably generated in the production of circular reinforcing fabrics.
• Further examples are shown in Figures 5c and 5d, where the second reinforcing fabric is formed as a triangle or as a star, which can also be made without jetting. It can therefore be seen that polyhedral shapes are particularly suitable for the reject-free production of the reinforcing fabric.
• first reinforcing fabric 1 1 is always circular and substantially covers the entire disc.
• the manufacturing process will be explained. It is based essentially on the usual process for the production of resin-bonded grinding wheels, as for example, the German patent application 10 201 1 109 536 is based. Successively, the second reinforcing fabric 12, the mixture 10 and the first reinforcing fabric 1 1 is introduced into a mold 14. Subsequently, a lid is placed. The assembly is then pressed by means of a pressing force F. In conventional wafers, however, the second reinforcement fabric 12 completely covers the bottom of the die 14, which is no longer possible with the second reinforcement fabric 12 reduced according to the invention. So there is the danger that the mixture 10 can get directly to the bottom of the mold 14 and can stick with the mold. A removal of the finished pressed disc is then difficult or impossible.
• a surface layer 16 is placed under the second reinforcing fabric 12 in the mold, which is a barrier for the mixture 10 opposite the bottom of the mold 14.
• the surface layer has a diameter corresponding to the nominal diameter N of the disc.
• the surface layer 16 may be formed from a fabric, for example a paper or textile fabric.
• a third reinforcing fabric 13 can additionally be inserted into the mold.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51564664

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (4)

Citations (4)

Family Cites Families (17)

• 2013
  • 2013-09-17 DE DE102013110237.9A patent/DE102013110237A1/de not_active Withdrawn
• 2014
  • 2014-09-17 PL PL14766728T patent/PL3046729T3/pl unknown
  • 2014-09-17 EP EP14766728.1A patent/EP3046729B1/de not_active Not-in-force
  • 2014-09-17 CN CN201480049160.3A patent/CN105592984A/zh active Pending
  • 2014-09-17 WO PCT/EP2014/069835 patent/WO2015040083A1/de active Application Filing
  • 2014-09-17 HU HUE14766728A patent/HUE036683T2/hu unknown
  • 2014-09-17 SI SI201430624T patent/SI3046729T1/en unknown
  • 2014-09-17 US US15/022,211 patent/US20160229024A1/en not_active Abandoned
  • 2014-09-17 ES ES14766728.1T patent/ES2660568T3/es active Active

Patent Citations (4)

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