Classifications

• • 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
  • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
  • B24D11/02—Backings, e.g. foils, webs, mesh fabrics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
  • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
  • B24D18/0045—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by stacking sheets of abrasive material
• • 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
• • 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
  • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
• • 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

Definitions

• the invention relates to a carrier body for a grinding tool according to the preamble of claim 1 and a grinding tool with such a carrier body and an abrasive, in particular superabrasive abrasive coating, which is arranged on a, preferably peripheral, carrier surface of the carrier body, preferably wherein the abrasive coating a continuous slip ring or individual abrasive segments is formed.
• the invention further relates to a method for producing a carrier body according to the preamble of claim 11 and a method for producing a grinding tool with such a carrier body.
• Carrier body for grinding tools should be as stable, light and dampening designed, especially in so-called centerless grinding tools.
• a disadvantage of these support bodies is that a relatively large uncontrolled waste is obtained in the production of the carrier, and only a limited range of support bodies in terms of dimensions can be produced. In addition, there are cracks in the grinding insert. The maximum maximum working speed is limited to approx. 63 m / s.
• a grinding tool with a carrier body is known, which is formed from layers of a fibrous layer material. The grinding tool is produced together with the carrier body in a press with specified dimensions, wherein the individual layers of the layer material must be successively inserted into the press. This method of preparation is very time consuming. In addition, using the press only grinding tools can be made with the specified size, so it is not possible to produce a grinding tool with different dimensions.
• carrier body of a carbon fiber reinforced plastic. This material allows the realization of lightweight and dimensionally stable carrier body. However, this is associated with a very complex production and very high production costs.
• the object of the present invention is to at least partially overcome the disadvantages of the prior art and to provide a contrast improved and lighter carrier body and a grinding tool with such a carrier body.
• Another object is to provide a method for producing a carrier body or a grinding tool with a carrier body, wherein the method is characterized in particular in that carrier body or grinding tools with different dimensions can be produced in a flexible manner and that in a short time and to justifiable production costs.
• the carrier body consists essentially of a non-abrasive composite material of a plurality of superimposed layers of a natural fiber material, which are interconnected by plastic, preferably phenolic resin.
• abrasives in connection with the present invention hard material grains which are used to achieve a material removal.
• Natural grain materials fluorescence, quartz, corundum, emery, garnet, Natural diamond
• synthetic grain materials corundum, silicon carbide, chromium oxide, cubic boron nitride, diamonds.
• abrasive or superabrasive agents are present in a material, they are designed to be free of abrasives for the purposes of the present invention.
• Abrasive-free composites of a plurality of superposed layers of a natural fiber material, which are interconnected by plastic, preferably phenolic resin, wherein the natural fiber material is a cotton fabric or paper, are from the technical field of producing electrical and thermal insulating components for mechanical and plant engineering - in the case of cotton fabric - as cotton hard tissue and - in the case of paper - known as hard papers.
• the carrier body according to the invention Compared with the known from the prior art carrier bodies of a phenolic molding composition, the carrier body according to the invention has an approximately 30% higher bending stress, about three times greater elongation at break and a higher elasticity, and is about 15% lighter. Higher rates of use are possible, e.g. of 125 m / s and more.
• an abrasive coating mixture for producing a slip ring is pressed onto the carrier body, a lower pressure is required for this purpose during pressing.
• the grinding tool is significantly easier to shape because the carrier body does not expand after hot pressing. Even pressing without a collar is easier, resulting in a potential savings in machining results.
• the use of the composite material also makes it possible to produce carrier bodies in a larger dimensional range. So are readily carrier body For example, up to a diameter of 1050mm and a height of 100mm produced.
• the composite also has the advantage that it is easier to machine with hard metal. Usually, in comparison, expensive tools with PCD cutters must be used for machining the materials used in the prior art. Furthermore, the composite is very good with other materials, e.g. CFRP, GFRP, AI or steel, combinable, e.g. by gluing or screwing.
• the composite material used in the present invention is thermoset, i. after its hardening no longer deformable.
• the carrier body comprises a first, preferably cylindrical or hollow cylindrical, body and at least one further, preferably cylindrical or hollow cylindrical body, wherein the bodies are connected to each other, preferably glued, can be built in a flexible manner lightweight carrier body with complex shapes, as in the prior art only with carbon fiber reinforced plastic were feasible, but in a much shorter time and at significantly lower cost.
• the natural fiber material is a cotton fabric or paper.
• the composite has proven to be advantageous for the composite to have a density of 1.0 to 2.0 g / cm 3 , preferably 1.4 g / cm 3 (measured, for example, according to the test standard ISO 1183) and / or a water absorption of 1, 5 to 7.5%, preferably 2.4% or 5.2%, (eg, measured according to the test standard ISO 62).
• the composite has proved to be advantageous for the composite to have a coefficient of linear expansion of 20 to 40 ⁇ 10 6 K 1 , preferably 30 ⁇ 10 6 K 1 (measured, for example, according to the test standard DIN 51045) and / or one Thermal conductivity of 0, 1 to 0.3 W / mK, preferably 0.2 W / mK, (eg, measured according to the test standard DIN 52612).
• the application temperature can be 1 10 ° C or 180 ° C, permanently or temporarily.
• the composite has a compressive strength at 23 ° C of 200 to 400 N / mm 2 , preferably 300 N / mm 2 or 320 N / mm 2 , (eg measured according to the test standard ISO 604) and or a flexural strength at 23 ° C of 50 to 150 N / mm 2 , preferably 100 N / mm 2 or 135 N / mm 2 , (eg measured according to the test standard ISO 178) and / or an E-modulus (from bending test) from 6000 to 8000 N / mm 2 , preferably 7000 N / mm 2 (eg measured according to the test standard ISO 178) and / or a tensile strength of 50 to 150 N / mm 2 , preferably 80 N / mm 2 or 120 N / mm 2 , (eg measured according to the test standard ISO 527) and / or a splitting force of 1500 to 3500 N, preferably 1900 N or 3000 N,
• the composite material may have a CTI 100 creep resistance (eg measured according to the IEC 1 12 test standard), and / or an electrical breakdown strength (vertical) of 1, 5 KV / 3 mm or 10 KV / 3 mm (eg measured according to the test standard IEC 243-1), and / or have an electrical breakdown strength (parallel) of 1, 0 KV / 25 mm or 10 KV / 25 mm (eg measured according to the test standard IEC 243-1).
• the carrier body has at least one separate from the support surface for the abrasive coating side surface on which a layer of the composite material is arranged flat.
• the carrier body comprises a central coupling region, preferably with a central bore, for connection to a rotary drive for rotating the carrier body or a grinding tool formed therewith about an axis of rotation extending through the coupling region, and / or the carrier body is essentially rotationally symmetrical is.
• the first and the at least one further body are cylindrical or hollow cylindrical bodies which are connected to each other at side surfaces, preferably wherein the axes of symmetry of the bodies are substantially congruent.
• the support bodies or grinding tools that can be realized in this way are particularly well suited, for example, for grinding camshafts.
• the carrier body has an adapter for connecting the carrier body or a grinding tool formed thereon to a rotary drive, which is connected to at least one of the body, preferably glued, preferably, wherein the adapter consists essentially of a metal and / or is formed substantially hollow cylindrical.
• the carrier body has a central bore
• the adapter is arranged at least partially in the central bore, preferably wherein the adapter extends over only a partial length of the central bore, particularly preferably wherein the central bore has a trichel-shaped insertion opening.
• a funnel-shaped insertion opening facilitates the clamping of the carrier body.
• a grinding tool having a carrier body according to the invention and an abrasive, in particular superabrasive abrasive coating, which is arranged on the, preferably peripheral, carrier surface of the carrier body, preferably wherein the abrasive coating is formed from a continuous slip ring or individual abrasive segments.
• a method for producing a carrier body for a grinding tool wherein the carrier body comprises a, preferably peripheral, carrier surface for an abrasive, in particular superabrasive, having abrasive coating and essentially of a abrasive-free composite material of a plurality of superimposed layers of a natural fiber Material which are interconnected by plastic, preferably phenolic resin, consists, preferably wherein the natural fiber material is a cotton fabric or paper, wherein the abrasive-free composite material in a first process step in the form of a plate is provided, and in a second process step a, preferably cylindrical or hollow cylindrical body, preferably by water jet cutting or by means of a band saw, with predetermined dimensions from the plate is cut out.
• plastic preferably phenolic resin
• At least one further, preferably cylindrical or hollow cylindrical body with predetermined dimensions is cut out of the plate and connected to the first body, preferably by gluing.
• first and the at least one further body are cylindrical or hollow cylindrical bodies which are connected to each other at side surfaces, preferably wherein the axes of symmetry of the bodies are brought substantially into coincidence with one another.
• the body or bodies are or will be reworked, preferably by machining and / or balancing and / or by attaching a central bore.
• a method for producing a grinding tool with a carrier body which comprises a, preferably peripheral, carrier surface for an abrasive, in particular superabrasive abrasive coating comprising and essentially of a abrasive-free composite material of a plurality of superimposed layers of a natural fiber material, Which by plastic, preferably phenolic resin, is, preferably wherein the natural fiber material is a cotton fabric or paper, and an abrasive, in particular superabrasive, having abrasive coating, which is arranged on the, preferably peripheral, support surface of the carrier body, preferably wherein the abrasive coating is formed from a continuous slip ring or individual abrasive segments, wherein first, preferably by means of the method for Fier ein the carrier body produced, carrier body is provided and then an abrasive, preferably superabrasive, having abrasive coating on a, preferably peripheral, carrier surface of the carrier body is preferably arranged by plastic, preferably phenolic
• FIG. 1 b the carrier body of FIG. 1 a in a schematic
• FIG. 2 shows a grinding tool according to a first preferred embodiment in a schematic side view
• Fig. 3a a photo of a grinding tool according to a second preferred
• Fig. 3b shows a microscope image of a cross-sectional area of the
• FIG. 5 shows a method for Fiergna a carrier body or a
• FIGs 1 a) and 1 b) show a carrier body 1 for a grinding tool 2 (see also Figure 2), which is substantially rotationally symmetrical and a peripheral side support surface 3 for an abrasive 4, in particular superabrasive, having abrasive coating 5 comprises.
• the carrier body 1 consists essentially of a abrasive-free composite material 6 of a plurality of superimposed layers 7 of a natural fiber material, which are interconnected by plastic 8. This is schematically indicated in the enlarged section of FIG. 1 b).
• the plastic 8 may be a cured synthetic resin, preferably phenolic resin.
• Immediately adjacent layers 7 may have a very small distance from each other and even touch at least in some areas.
• the layers 7 are aligned substantially parallel to side surfaces.
• the natural fiber material is a cotton fabric.
• the composite 6 has a density of 1.4 g / cm 3 and a water absorption of 2.4%. Furthermore, the composite material 6 has a coefficient of linear expansion of 30 ⁇ 10 6 K 1 and a thermal conductivity of 0.2 W / mK. And finally, the composite 6 has a compressive strength at 23 ° C of 320 N / mm 2 , a bending strength at 23 ° C of 100 N / mm 2 , an E modulus of 7000 N / mm 2 , a tensile strength of 80 N / mm 2 and a splitting force of 3000 N on.
• the natural fiber material is paper.
• the composite 6 has a density of 1.4 g / cm 3 and a water absorption of 5.2%. Furthermore, the composite material 6 has a coefficient of linear expansion of 30 ⁇ 10 6 K 1 and a thermal conductivity of 0.2 W / mK on. And finally, the composite 6 has a compressive strength at 23 ° C of 300 N / mm 2 , a bending strength at 23 ° C of 135 N / mm 2 , an E modulus of 7000 N / mm 2 , a tensile strength of 120 N / mm 2 and a splitting force of 1900 N on.
• the carrier body 1 has two opposite from the support surface 3 for the abrasive coating 5 separate side surfaces 9, on each of which a layer 7 of the natural fiber material is arranged flat (see also Figure 3a)).
• the carrier body 1 comprises a central coupling region 10 with a central bore 11 for connection to a rotary drive for rotating the carrier body 1 or a grinding tool 2 formed therewith about an axis of rotation 12 extending through the coupling region 10.
• the axis of rotation 12 extends through the center 25 of the central bore 11 and is aligned substantially normal to the side surfaces 9.
• the dimensions of the carrier body 1 can be characterized by its diameter 17, its thickness 18 and the diameter 19 of the central bore 11.
• the grinding tool 2 illustrated in FIG. 2 comprises a carrier body 1 and an abrasive material 4, in particular a superabrasive, having abrasive coating 5, which is arranged on the circumferential carrier surface 3 of the carrier body 1.
• the abrasive 4 is indicated schematically in the enlarged section.
• the abrasive 4 is in a bond, e.g. a ceramic bond, embedded.
• the abrasive coating 5 can be formed from a continuous slip ring or, as indicated in the lower region of the grinding tool 2, individual abrasive segments 13.
• the carrier body 1 has a side surface 9 separate from the carrier surface 3 for the abrasive coating 5, on which a layer 7 of a natural fiber material in the form of a cotton fabric is arranged flat.
• a layer 7 of a natural fiber material in the form of a cotton fabric is arranged flat.
• the carrier body 1 may have balancing bores 22 and / or a step 23 for improving the rotational behavior of the grinding tool 2.
• FIG. 3b shows a microscope image of a cross-sectional area of the composite material used in the grinding tool 2 according to the second preferred embodiment.
• the layers 7 of the cotton fabric which are arranged one above the other in the direction of the axis of rotation 12 and which are constructed from individual cotton fibers 26 are clearly visible.
• Figures 4a) and 4b) show microscope images of a further preferably used composite material, namely a side surface ( Figure 4a)) and a cross-sectional area ( Figure 4b)).
• the natural fiber material is paper.
• FIG. 4 a individual paper fibers 27, which are aligned stochastically within a layer 7, can be seen.
• FIG. 4b) shows a structure of layers 7 arranged one above the other.
• the abrasive-free composite material 6 is provided in a first step 15 of a plurality of superposed layers 7 of a natural fiber material, which are connected by plastic 8, preferably phenolic resin, in the form of a plate.
• a body preferably by
• a third method step 20 the body is reworked, preferably by machining and / or balancing.
• This method 14 can be expanded to a method 21 for producing a grinding tool 2, in a further method step 28, an abrasive 4, preferably superabrasive, having abrasive coating 5 on a, preferably peripheral, support surface 3 of the carrier body 1, preferably by pressing and / or Bonding, is arranged, preferably wherein the abrasive coating 5 is formed from a continuous slip ring or individual abrasive segments 13.
• the third method step 20 can optionally also be carried out only after the arrangement of the abrasive coating 5 on the carrier surface 3 of the carrier body 1.
• Figures 6a) and 6b) show a grinding tool 2 with a support body 1, which is composed of five hollow cylindrical bodies 29, 30, 31, 32, 33, wherein the body 29, 30, 31, 32, 33 glued to each other at side surfaces 9 are.
• the symmetry axes 12 of the bodies 29, 30, 31, 32, 33 are substantially congruent.
• a different number of cylindrical or hollow cylindrical bodies 29, 30, 31, 32, 33 can be used.
• the carrier body 1 has an adapter 34 for connecting the carrier body 1 or the grinding tool 2 formed therewith to a rotary drive, which is glued to the bodies 32 and 33.
• the adapter 34 may also be connected to more than two or only one of the bodies 29, 30, 31, 32, 33, in particular depending on the rigidity of the grinding tool 2 to be achieved.
• the adapter 34 may essentially consist of a metal and, as in the case shown, may be substantially hollow-cylindrical.
• the adapter 34 can have bores 37 for receiving fastening means, by way of which the adapter 34 can be connected to a machine spindle.
• the carrier body 1 has a central bore 11.
• the adapter 34 is arranged in the central bore 11, wherein the adapter 34 only over a partial length 35 of Center hole 11 extends.
• the center bore 11 has a slot-shaped insertion opening 36.
• an abrasive coating 5 is arranged in each case peripherally.
• the bodies 29, 30, 31, 32, 33 are connected to each other after their separation from the plates on side surfaces 9, wherein axes of symmetry 12 of the body 29, 30, 31, 32, 33 substantially coincide to be brought.
• a third method step 20 the bodies 29, 30, 31, 32, 33, reworked by machining, in particular to provide the central bore 11 with predetermined dimensions.
• the bodies 32, 33 are connected to the adapter 34.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=66554077

Family Applications (1)

Country Status (8)

Family Cites Families (23)

• 2018
  • 2018-06-07 AT AT504552018A patent/AT521162B1/de active
• 2019
  • 2019-04-30 CN CN201980032128.7A patent/CN112118937A/zh active Pending
  • 2019-04-30 WO PCT/AT2019/060146 patent/WO2019232559A1/de unknown
  • 2019-04-30 CA CA3097300A patent/CA3097300C/en active Active
  • 2019-04-30 EP EP19724336.3A patent/EP3755500A1/de active Pending
  • 2019-04-30 BR BR112020020727-6A patent/BR112020020727A2/pt not_active Application Discontinuation
  • 2019-04-30 MX MX2020013151A patent/MX2020013151A/es unknown
• 2020
  • 2020-10-19 US US17/073,842 patent/US20210031332A1/en active Pending

Also Published As

Similar Documents

Legal Events