EP3600771B1 - Improved abrading wheel - Google Patents
Improved abrading wheel Download PDFInfo
- Publication number
- EP3600771B1 EP3600771B1 EP17715119.8A EP17715119A EP3600771B1 EP 3600771 B1 EP3600771 B1 EP 3600771B1 EP 17715119 A EP17715119 A EP 17715119A EP 3600771 B1 EP3600771 B1 EP 3600771B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- abrading wheel
- grooves
- rim
- grit
- circular core
- 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.)
- Active
Links
- 239000000463 material Substances 0.000 claims description 63
- 210000002105 tongue Anatomy 0.000 claims description 37
- 239000002245 particle Substances 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 12
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 4
- 238000007373 indentation Methods 0.000 description 9
- 238000009825 accumulation Methods 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 241001212149 Cathetus Species 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B24D5/10—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with cooling provisions, e.g. with radial slots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
- B24D9/08—Circular back-plates for carrying flexible material
Definitions
- the present invention relates to abrading wheels. More specifically, the present invention relates to abrading wheels for grinding a product or finishing a surface of a rubber product to form a desired surface smoothness.
- abrading wheels are characterised by their ability to grind products or to tear products apart.
- such products may be rubber tires or the like, where there is a desire to refurbish or recycle material.
- a use situation usually involves rotating the abrading wheel at high speed and applying the product to be grinded onto grit disposed onto an outer surface of the abrading wheel. Thereby, the part of the product in contact with the abrading wheel is disintegrated, and the abrading wheel may either be used to smoothen the surface of the remaining part of the product, or the abrading wheel may be used to disintegrate the entire product.
- several problems are known to occur. The particles from the product being grinded may quickly accumulate in the grit, thereby leaving the abrading wheel useless.
- the abrading surface will turn into a smooth surface over time due to the accumulation of particles in the grit.
- the grit, and the surface onto which said grit is disposed may heat up due to friction between the abrading wheel and the product being grinded.
- the products being grinded may behave differently at elevated temperatures or the abrading wheel may attain temperatures exceeding what is considered safe.
- US2002/035890A1 discloses a metal bonded drilling tool which is improved in grinding performance with a long life and can drill a hole in a dry condition without the need for water.
- the metal bonded drilling tool includes a cylindrical body having an open front end portion, a shank integral with the cylindrical body and having a threaded hole for use in mounting the tool to a rotary tool, and numerous abrasive grains bonded to a front edge of the cylindrical body and to inner and outer cylindrical surfaces of the front end portion of the cylindrical body by a bond member formed primarily of copper alloy.
- US3579928A discloses an abrading wheel having oblique throughgoing holes in the rim and a grit material provided on the outer surface of the rim. US3579928A does not disclose any overhang of the grit material and it does not disclose any openings in the central core. An overhang will be counter productive to the purpose of the throughgoing holes of the solution illustrated in US3579928A .
- an abrading wheel comprising a circular core having an outer periphery, a rim arranged orthogonally to said circular core on said outer periphery, said rim comprising an inner surface and an outer surface, and a grit material disposed on at least part of said outer surface, and where a plurality of openings are arranged in said core for providing an airflow directed towards said inner surface, and wherein the outer surface of said rim is provided with a plurality of grooves, and where a main part of said grit material is disposed on said outer surface of said rim on spaces between said grooves.
- a circular core is meant a unitary, solid, continuous core of metal.
- the circular core is made from steel.
- the core has a thickness ensuring stability when rotating the abrading wheel at operation speeds. The thickness should correspond to the diameter and use of the tool, but may be from 2 to 6 mm.
- the diameter of the circular core may be between 50 mm and 300 mm, depending on use.
- An outer periphery is inevitably a part of a circular core as defined.
- a rim is meant a ribbon-shaped metal comprising a width greater than the thickness of the circular core and a length equal to the circumference of the outer periphery of said circular core. The width of the rim defines the working width of the abrading wheel.
- the width of the rim may vary according to the use, but may be at least 20 mm or may be at least 200 mm. However, it should be noted that the width and in fact the entire abrading wheel may be scaled according to the desired use.
- the rim is mounted along an edge to the outer periphery.
- the rim is a circular element mounted onto said outer periphery.
- a grit material is meant a material preferably having a hardness substantially higher than the product which the abrading wheel is meant to grind.
- the grit material constitutes grit.
- the grit material may be tungsten carbide.
- the grit material may be formed as small grains comprising a plurality of sharp spikes, or it may be other structures comprising sharp edges capable of grinding products.
- the abrading wheel is cooled during operation, heat is more easily dissipated, and accumulation of particles from the product being grinded is minimised.
- Due to the plurality of openings in the circular core air is forced onto the inner surface of the rim thereby providing air cooling.
- Due to the presence of grooves on the outer surface the surface area of said outer surface is inevitably increased thereby increasing the dissipation of heat and providing additional cooling to the abrading wheel.
- By disposing a main part of the grit material on spaces between the grooves said grooves are kept free of grit material thereby minimising the risk of accumulation of material or particles in said grooves.
- the combination of cooling the abrading wheel and reducing the risk of accumulation of particles further increases the lifetime of said abrading wheel.
- the circular core may comprise a central axis and a central aperture for mounting the abrading wheel on a rotation tool.
- a central axis is meant an axis arranged orthogonally to the plane, wherein the outer periphery lies, and where said axis is arranged in the centre of the circular core. Thereby, the central axis is positioned equidistant from the outer periphery of the circular core.
- a central aperture is meant a through-going opening arranged in the centre of the circular core.
- the central aperture is arranged in a displaced depression, said depression being an integral part of the circular core.
- the depression is displaced such that the central aperture is positioned in a position providing the highest amount of stability to the abrading wheel when said abrading wheel is rotating at operational speeds. Such position may be in a central position of the abrading wheel when considering the abrading wheel as a whole, i.e. centrally to the circular hub and midway of the width of the rim.
- the abrading wheel may be mounted on a rotation tool and set into rotation around the central axis.
- the central aperture may have a shape corresponding to a shape of the rotation tool, such that rotation is secure and efficient.
- the central aperture comprises at least one indentation for engaging with a corresponding protrusion on the rotation tool, such that the abrading wheel is fastened securely.
- the cross section of the grooves may be V-shaped.
- the grooves extend into the outer surface of the rim.
- the cross section of the grooves being V-shaped, particles are less likely to accumulate in the grooves, since the surface area in the vicinity of the vertex of the groove is minimised compared to other shapes, such as U-shaped grooves.
- the plurality of grooves may be arranged in a helix having an axis collinear and coinciding with the central axis.
- the plurality of grooves may be tilted relative to an edge of the rim.
- the grooves are oblique to a normal cutting angle between the product to be grinded and the outer surface of the rim.
- a normal cutting angle may be defined as the cutting angle, wherein the product to be grinded is applied orthogonally to the outer surface of the rim. That means normal incident of the product to be grinded onto the outer surface of the rim.
- the grooves may be tilted relative to an edge of the rim, said edge being collinear with the outer periphery of the central core.
- a larger amount of grit material disposed on the spaces between the grooves makes impact onto the product to be grinded.
- the plurality of grooves arranged in a helix provide clearance for a majority of the grit, i.e. a majority of the grit is arranged aggressively relative to the product to be grinded, such that the efficiency of the grinding process in increased.
- being arranged aggressively is meant that shadowing of grains of the grit material is minimised with respect to subsequent grains when the abrading wheel is rotating.
- an increased free space is provided for the grit material to come into contact with the product to be grinded.
- the arrangement of the grooves along the direction of rotation provides an enhanced free flow of particles, such that accumulation in the grit of said particles originating from the product being grinded is minimised.
- Said free flow of particles causes said particles to be guided away from the abrading wheel along the grooves.
- the particles formed from the grinding process are guided in a route given by the arrangement of the grooves, and where said arrangement of grooves are in a helix, the route leads the particles out of the abrading wheel.
- the abrading wheel has an inherent self-clearing effect. In combination with the aggressively arranged grit due to the helix or tilt arrangement, the abrading wheel experiences an increased lifetime.
- the plurality of grooves may be arranged parallel to each other and parallel to the outer periphery of the circular core.
- the grooves are arranged orthogonally to the central axis of the abrading wheel, i.e. the central axis of rotation.
- grains of the grit material disposed on spaces between the grooves may be said to shadow subsequent grains of same grit material, i.e. the grinding efficiency of the abrading wheel is lowered which may be desired in certain use.
- the resistance between the grit and product to be grinded is reduced. That means that due to the grooves and accompanying spaces with grit material being aligned to the normal cutting angle, a smaller amount of grit material is exposed to the product to be grinded at a given time. Thus, the resistance is reduced which may be useful for certain products or situations.
- the rim may be a ribbon mounted onto the outer periphery of the circular core along an edge of said ribbon.
- a ribbon is meant a primarily rectangular piece of material bent to fit the outer periphery of the circular core.
- the ribbon comprises two side edges and two end edges, said end edges being joined to form a circular ribbon.
- One of said side edges are mounted on the outer periphery of the circular core, such that the abrading wheel resembles a bowl.
- the thickness of the circular core may be smaller than the width of the rim, such that the inner surface of the rim is exposed to air.
- the mounting may be through welding, or the mounting may be through means of pressing, stamping, or casting the abrading wheel in a single piece.
- a tongue may be attached to each opening of the circular core, a plurality of tongues thereby being arranged in said circular core.
- the tongues may be formed from excess material bent away from the opening, the tongues thereby being an integral part of the circular core.
- the tongues are oriented such that air is forced onto the inner surface of the rim, thereby providing air cooling to the abrading wheel.
- a tongue By a tongue is meant a partially free piece of material freed from the circular core.
- a tongue and an opening may be formed simultaneously by making appropriate cuts in the circular core, followed by bending an uncut edge away from the plane of the circular core.
- the tongue is attached to the circular core through the bow and may therefore be considered an integral part of the circular core.
- the openings may be said to comprise integrated tongues.
- the tongues may be said to be cooling tongues.
- the tongues may be regarded as wings.
- the plurality of tongues are bent towards an inner volume partly defined by the inner surface of the rim and the circular core.
- the tongues are arranged in a homogenous pattern, such that the tongues are positioned identically relative to the opening for all openings provided in the circular core.
- the openings are quasi-quadratic and the uncut edge is oriented orthogonally to the outer periphery of the circular hub.
- passive means for guiding an air flow onto the inner surface of the rim is realised.
- passive means is meant that said air flow is pulled into the abrading wheel and guided onto the inner surface of the rim by the combination of high rotation speed of the abrading wheel and the orientation of the tongues. Said orientation of the tongues is chosen to maximise the air flow onto the inner surface of rim during high speed rotation of the abrading wheel.
- the passive means for guiding an air flow onto the inner surface of the rim provides passive cooling means of the abrading wheel.
- said passive cooling means causes a lower working temperature of the abrading wheel.
- the grit material may form an overhang above said grooves.
- an overhang is meant that free space is provided between the outer surface of the rim and parts of the grit material disposed primarily on the spaces between the grooves.
- the combined surface area of grit material exposed to the surroundings is increased compared to a situation where no overhang is provided.
- a larger part of said product may be in contact with the grit thereby increasing the efficiency of the abrading wheel.
- the amount of grit may be increased by allowing an overhang while maintaining the presence of grit-free grooves for avoiding accumulation of particles as described earlier.
- an increased surface area of grit material results in an increased amount of heat dissipation thereby increasing the cooling abilities of the abrading wheel.
- the grit material may be tungsten carbide.
- the grit material has a hardness superior to most materials which it is expected to grind.
- Materials possessing similar hardness such as silicon carbide, are foreseen within the scope of the invention.
- the grit size may be between 14 and 220.
- the grit size disclosed is standardised according to Federation of European Producers of Abrasives (FEPA).
- a grit size of 14 corresponds to a particle size (mean diameter) of 1.47 mm
- a grit size of 220 corresponds a particle size (mean diameter) of 0.058 mm.
- the grit may be varied according to use and the desired smoothness of the grinded product.
- the abrading wheel may be mounted onto a rotation tool, said rotation tool being capable of providing rotation around a central axis of the abrading wheel.
- the mounting is done by engaging a rotational part of the rotation tool in the central aperture and the indentation, where said central aperture and indentation corresponds to the dimension of the rotational tool and a protrusion in said rotational part, respectively.
- the abrading wheel may be set in an efficient and secure rotation.
- Fig. 1 is a perspective view of a part of an abrading wheel 100 according to the invention.
- the abrading wheel 100 comprises a circular core 101 having an outer periphery 103 and a central aperture 105. Said central aperture 105 is arranged in a depression 109. Said depression 109 protrudes into an inner volume (not shown) partly defined by said circular core 101 and a rim 111 arranged orthogonally to said core 101 on said outer periphery 103.
- the abrading wheel 100 may be said to be bowl-shaped with a central depression 109.
- the depression 109 is an integral part of the core 101 therefore being considered as part of the core 101 in this context.
- the central aperture 105 comprises at least one indentation 107 for mounting the abrading wheel 100 securely onto a rotation tool (not shown).
- the indentation 107 may be formed to correspond to a protrusion on said rotation tool (not shown).
- Said rotation tool may be used to rotate the abrading wheel 100 around a central axis L by engaging with the central aperture 105 and the at least one indentation 107.
- the rim 111 may be either mounted through e.g. welding onto the outer periphery 103 of the core 101, or the combined rim 111 and core 101 may be formed from a single piece of material, such that the outer periphery 103 is formed when bending/stamping said single piece of material.
- the core 101 and rim 111 are formed in a casting process.
- the core 101 is equipped with a plurality of openings 121.
- said openings 121 are arranged equiangularly in a circular pattern at a fixed distance from a centre point of the central opening 105.
- the openings 121 are equipped with tongues 123, said tongues 123 preferably being an integral part of the core 101 and formed from bending the material along an uncut edge 124.
- the openings 121 may be rectangular, such that the tongues 123 are formed from cutting along three edges thus leaving a fourth edge uncut and thereby allowing said fourth edge to be bent.
- the tongues 123 are bent towards the inner volume (not shown).
- the tongues 123 are bent evenly for all openings 121, such that a homogenous pattern of the openings 121 and tongues 123 is formed.
- the tongues and accompanying openings draw in an air flow, such that said air is forced onto an inner surface (not shown) of the rim 111.
- said air flow provides air cooling of the abrading wheel. Air cooling is essential when using the abrading wheel 100 for grinding purposes, where heating may occur due to friction.
- the rim 111 is arranged orthogonally to the plane of the core 101, i.e. the rim extends in a direction parallel to the central axis L.
- the rim comprises an outer surface 113 and an inner surface (not shown).
- the inner surface is oriented towards the inner volume (not shown) of the abrading wheel 100 partly defined by the core 101 and the rim 111.
- the outer surface 113 comprises a plurality of grooves 131, for example carved into said outer surface. Said plurality of grooves 131 twists around the central axis L.
- the grooves 131 are arranged in a helix with an axis collinear and coinciding with the central axis L.
- the grooves 131 are parallel to each other and to the outer periphery 103 of the core 101.
- the grooves 131 are tilted relative to the outer periphery 103.
- intermediate protruding spaces 132 are formed, said spaces 132 inevitably having the same course, e.g. a helix, as the grooves 131.
- a grit material 141 is disposed primarily onto said spaces 132 thereby leaving the grooves 131 free of grit material 141. See Fig. 5a and Fig. 6a for a cross-sectional view of the grooves 131, the spaces 132 and the disposed grit material 141.
- Said grit material 141 is made from a hard material such as tungsten carbide having a hardness of 9 on the Mohs-scale.
- the grit material 141 grinds said product. Due to the absence of grit material 141 in the grooves 131, particles grinded off the applied product are less likely to accumulate in the grooves thereby increasing the lifetime of the abrading wheel 100. In otherwords, particles entering the grooves 131 are free to move and eventually escape said grooves 131, contrary to the case wherein grit material 141 would be disposed in the grooves 131, whereby particles would get trapped and accumulate more easily.
- the grooves 131 and accompanying intermediate spaces 132 are arranged in a helix or tilted relative to the outer periphery 103, a larger amount of grit material 141 makes contact with the product to be grinded at any given time during rotation of the abrading wheel 100, assuming the product makes normal incident onto the rim 111.
- the helix arranged or tilted grooves 131 and spaces 132 provide an increased free space for a product making contact to the grit material 132 disposed in the spaces 132.
- the grinding efficiency of the abrading wheel 100 is increased.
- grooves 131 and the accompanying intermediate spaces 132 being arranged in a helix or tilted relative to the outer periphery 103 are guided out of the abrading wheel.
- grooves 131 arranged in a helix or tilted inevitably comprise ends 133 terminating along an edge of the rim 111, where said ends 133 allow the particles to escape the abrading wheel 100.
- grooves 131 further increases the surface area of the abrading wheel 100 which in turn increases the dissipation of heat and thereby increases the cooling capabilities of said abrading wheel 100.
- Fig. 2 is a perspective view of the part of the abrading wheel 100 of Fig. 1 shown from another angle.
- the inner volume partly defined by the core 101 and the rim 111 is exposed.
- the inner surface 115 of the rim is shown in this view.
- the depression 109 protrudes into said inner volume.
- the central aperture 105 and the indentation 107 are partly visible.
- the tongues 123 are shown to be bent into the inner volume along an uncut edge 124.
- the openings 121 are shown to be cut along three edges 221, 222, 223, thereby leaving the uncut edge 124 uncut.
- the tongues 123 are all bent along the same uncut edge 124 relative to the core 101 thereby forming a homogenous pattern along the entire diameter along which the openings 121 are arranged.
- the uncut edge 124 is orthogonal to the rim 111.
- a grit material 141 is disposed on spaces between a plurality of grooves (not shown in this embodiment) on the outer surface 113 of the rim 111. The grit material 141 is shown in further detail in Fig. 5 and Fig. 6 .
- Fig. 3 shows a top view of the abrading wheel 100.
- the top view exposes the inner volume.
- the direction of the central axis L serves as reference to Fig. 1 .
- the plurality of openings 121 is shown without tongues 123. However, it should be noted that in the case of said tongues 123 being an integral part of the core 101, it is not optional to detach or attach said tongues 123.
- the plurality of openings 121 is shown to be equiangularly spaced on the core 101 around the central axis L.
- the central aperture 105 is shown to be arranged symmetrically around the central axis L.
- the abrading wheel 100 is shown with two indentations 107, 107', for improved stability when mounting the abrading wheel onto a rotation tool (not shown).
- the depression 109 is indicated by a dotted line.
- the grit material 141 is shown disposed on an outer surface 113 of the rim 111. Three cross sections, A-A, B-B, and C-C, are indicated in Fig. 4 and described in further detail below.
- Fig. 4 shows the cross sections indicated in Fig. 3 .
- Fig. 4a illustrates the cross section A-A comprising two of the plurality of openings 121.
- the tongues 123 are shown to be an integral part of the core 101 and being bent along an uncut edge 124 indicated by a dotted line.
- Fig. 4b illustrates the cross section B-B.
- the tongue 123 attached to the opening 121 is shown as a displaced dotted box due to the choice of viewing angle.
- the rim 111 is shown being arranged orthogonally to the core 101.
- An edge of the rim 101 is shown to be mounted onto the outer periphery 103 of the core 101, the rim 111 thereby forming an acute angle of 90 degrees and an obtuse angle of 270 degrees relative to the core 101.
- the rim 111 comprises a plurality of grooves 131 arranged in the outer surface 113.
- the plurality of grooves 131 are separated by a plurality of spaces 132.
- a grit material 141 is disposed onto said spaces 132.
- Fig. 4c illustrates the cross section C-C.
- the abrading wheel is rotationally symmetric around the central axis L.
- the direction of the central axis L corresponds to the direction given from Fig. 1 .
- the depression 109 protrudes towards the inner volume partly formed by the core 101 and the rim 111. More specifically, the depression 109 displaces the central aperture 105 towards a midway point defined from the width of the rim 111. Thereby, stability of the abrading wheel 100 is increased when said abrading wheel 101 is exposed to rotational forces.
- Fig. 5 and Fig. 6 show two possible excerpts of the outer surface 113.
- the orientation of the excerpts relative to the rim 111 is indicated by the directions x and z which are further defined in Fig. 1 .
- a cross view of each excerpt is shown in Fig. 5a and Fig 6a .
- the excerpts are examples of possible arrangements of the grooves 131 and accompanying spaces 132 thereby not limiting the scope of the invention.
- Fig. 5 illustrates an excerpt of an outer surface 113 comprising a large separation of grooves 131, i.e. large spaces 132. Further, the grooves 131 and the accompanying spaces 132 are tilted at an angle 1 relative to the x-direction. The tilt forms a helix along the circumference of the rim 111 and around an axis coinciding with the central axis L (not shown).
- the grit material 141 is disposed on the spaces 132, such that the grooves 131 are free of grit material 141.
- a shaded triangle indicates a possible impact area 150 for a product to be grinded by the abrading wheel 100.
- a product making normal incident i.e.
- Fig. 5a illustrates a cross-sectional view of the excerpt in Fig. 5 .
- the grooves 131 are V-shaped as illustrated.
- the grit material 141 overhangs parts of the grooves 131 illustrated by the overhang 142.
- Fig. 6 and Fig. 6a (cross-sectional view) illustrate an excerpt of an outer surface 113 comprising a small separation of grooves 131, i.e. narrow spaces 132. Further, the tilt given by the angle 1 is smaller than the excerpt illustrated in Fig. 5 .
- Fig. 7 illustrates a close-up cross-sectional view of a V-shaped groove 131 and grit material 141 disposed primarily on intermediate spaces 132 between said grooves 131. It is noted how an overhang 142 of grit material 141 is formed, such that free space is provided between the slopes of the groove and said grit material 141.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Braking Arrangements (AREA)
Description
- The present invention relates to abrading wheels. More specifically, the present invention relates to abrading wheels for grinding a product or finishing a surface of a rubber product to form a desired surface smoothness.
- Usually, abrading wheels are characterised by their ability to grind products or to tear products apart. For example, such products may be rubber tires or the like, where there is a desire to refurbish or recycle material. A use situation usually involves rotating the abrading wheel at high speed and applying the product to be grinded onto grit disposed onto an outer surface of the abrading wheel. Thereby, the part of the product in contact with the abrading wheel is disintegrated, and the abrading wheel may either be used to smoothen the surface of the remaining part of the product, or the abrading wheel may be used to disintegrate the entire product. However, during such use, several problems are known to occur. The particles from the product being grinded may quickly accumulate in the grit, thereby leaving the abrading wheel useless. In other words, the abrading surface will turn into a smooth surface over time due to the accumulation of particles in the grit. Further, the grit, and the surface onto which said grit is disposed, may heat up due to friction between the abrading wheel and the product being grinded. For example, the products being grinded may behave differently at elevated temperatures or the abrading wheel may attain temperatures exceeding what is considered safe.
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US2002/035890A1 discloses a metal bonded drilling tool which is improved in grinding performance with a long life and can drill a hole in a dry condition without the need for water. The metal bonded drilling tool includes a cylindrical body having an open front end portion, a shank integral with the cylindrical body and having a threaded hole for use in mounting the tool to a rotary tool, and numerous abrasive grains bonded to a front edge of the cylindrical body and to inner and outer cylindrical surfaces of the front end portion of the cylindrical body by a bond member formed primarily of copper alloy. -
US3579928A discloses an abrading wheel having oblique throughgoing holes in the rim and a grit material provided on the outer surface of the rim.US3579928A does not disclose any overhang of the grit material and it does not disclose any openings in the central core. An overhang will be counter productive to the purpose of the throughgoing holes of the solution illustrated inUS3579928A . - The object of the invention is to solve some of the above-mentioned problems. This is realised by an abrading wheel comprising a circular core having an outer periphery, a rim arranged orthogonally to said circular core on said outer periphery, said rim comprising an inner surface and an outer surface, and a grit material disposed on at least part of said outer surface, and where a plurality of openings are arranged in said core for providing an airflow directed towards said inner surface, and wherein the outer surface of said rim is provided with a plurality of grooves, and where a main part of said grit material is disposed on said outer surface of said rim on spaces between said grooves.
- By a circular core is meant a unitary, solid, continuous core of metal. Preferably, the circular core is made from steel. Preferably, the core has a thickness ensuring stability when rotating the abrading wheel at operation speeds. The thickness should correspond to the diameter and use of the tool, but may be from 2 to 6 mm. The diameter of the circular core may be between 50 mm and 300 mm, depending on use. An outer periphery is inevitably a part of a circular core as defined. By a rim is meant a ribbon-shaped metal comprising a width greater than the thickness of the circular core and a length equal to the circumference of the outer periphery of said circular core. The width of the rim defines the working width of the abrading wheel. The width of the rim may vary according to the use, but may be at least 20 mm or may be at least 200 mm. However, it should be noted that the width and in fact the entire abrading wheel may be scaled according to the desired use. The rim is mounted along an edge to the outer periphery. Thus, the rim is a circular element mounted onto said outer periphery. By a grit material is meant a material preferably having a hardness substantially higher than the product which the abrading wheel is meant to grind. The grit material constitutes grit. The grit material may be tungsten carbide. The grit material may be formed as small grains comprising a plurality of sharp spikes, or it may be other structures comprising sharp edges capable of grinding products.
- Thereby, the abrading wheel is cooled during operation, heat is more easily dissipated, and accumulation of particles from the product being grinded is minimised. Due to the plurality of openings in the circular core, air is forced onto the inner surface of the rim thereby providing air cooling. Due to the presence of grooves on the outer surface, the surface area of said outer surface is inevitably increased thereby increasing the dissipation of heat and providing additional cooling to the abrading wheel. By disposing a main part of the grit material on spaces between the grooves, said grooves are kept free of grit material thereby minimising the risk of accumulation of material or particles in said grooves. The combination of cooling the abrading wheel and reducing the risk of accumulation of particles further increases the lifetime of said abrading wheel.
- In an embodiment, the circular core may comprise a central axis and a central aperture for mounting the abrading wheel on a rotation tool.
- By a central axis is meant an axis arranged orthogonally to the plane, wherein the outer periphery lies, and where said axis is arranged in the centre of the circular core. Thereby, the central axis is positioned equidistant from the outer periphery of the circular core. By a central aperture is meant a through-going opening arranged in the centre of the circular core. Preferably, the central aperture is arranged in a displaced depression, said depression being an integral part of the circular core. Preferably, the depression is displaced such that the central aperture is positioned in a position providing the highest amount of stability to the abrading wheel when said abrading wheel is rotating at operational speeds. Such position may be in a central position of the abrading wheel when considering the abrading wheel as a whole, i.e. centrally to the circular hub and midway of the width of the rim.
- Thereby, the abrading wheel may be mounted on a rotation tool and set into rotation around the central axis. The central aperture may have a shape corresponding to a shape of the rotation tool, such that rotation is secure and efficient. Preferably, the central aperture comprises at least one indentation for engaging with a corresponding protrusion on the rotation tool, such that the abrading wheel is fastened securely.
- In an embodiment, the cross section of the grooves may be V-shaped.
- Thereby, the grooves extend into the outer surface of the rim. By the cross section of the grooves being V-shaped, particles are less likely to accumulate in the grooves, since the surface area in the vicinity of the vertex of the groove is minimised compared to other shapes, such as U-shaped grooves.
- In an embodiment, the plurality of grooves may be arranged in a helix having an axis collinear and coinciding with the central axis.
- In an embodiment, the plurality of grooves may be tilted relative to an edge of the rim.
- By an axis of the helix being collinear and coinciding with the central axis, said axes are indistinguishable. Thereby, the grooves are oblique to a normal cutting angle between the product to be grinded and the outer surface of the rim. A normal cutting angle may be defined as the cutting angle, wherein the product to be grinded is applied orthogonally to the outer surface of the rim. That means normal incident of the product to be grinded onto the outer surface of the rim. An oblique cutting angle is efficiently realised when the grooves, and the accompanying intermediate spaces between said grooves, are arranged in a helix-shaped pattern along the circumference of the rim. Alternatively, the grooves may be tilted relative to an edge of the rim, said edge being collinear with the outer periphery of the central core. Thus, when applying said product orthogonally to the outer surface of the rim, a larger amount of grit material disposed on the spaces between the grooves makes impact onto the product to be grinded. In other words, the plurality of grooves arranged in a helix provide clearance for a majority of the grit, i.e. a majority of the grit is arranged aggressively relative to the product to be grinded, such that the efficiency of the grinding process in increased. By being arranged aggressively is meant that shadowing of grains of the grit material is minimised with respect to subsequent grains when the abrading wheel is rotating. In other words, an increased free space is provided for the grit material to come into contact with the product to be grinded. Further, the arrangement of the grooves along the direction of rotation provides an enhanced free flow of particles, such that accumulation in the grit of said particles originating from the product being grinded is minimised. Said free flow of particles causes said particles to be guided away from the abrading wheel along the grooves. In other words, the particles formed from the grinding process are guided in a route given by the arrangement of the grooves, and where said arrangement of grooves are in a helix, the route leads the particles out of the abrading wheel. Thereby, the abrading wheel has an inherent self-clearing effect. In combination with the aggressively arranged grit due to the helix or tilt arrangement, the abrading wheel experiences an increased lifetime.
- In an embodiment, the plurality of grooves may be arranged parallel to each other and parallel to the outer periphery of the circular core.
- By being arranged parallel to each other and parallel to the outer periphery of the circular core, the grooves are arranged orthogonally to the central axis of the abrading wheel, i.e. the central axis of rotation. In such an arrangement, grains of the grit material disposed on spaces between the grooves may be said to shadow subsequent grains of same grit material, i.e. the grinding efficiency of the abrading wheel is lowered which may be desired in certain use.
- Thereby, the resistance between the grit and product to be grinded is reduced. That means that due to the grooves and accompanying spaces with grit material being aligned to the normal cutting angle, a smaller amount of grit material is exposed to the product to be grinded at a given time. Thus, the resistance is reduced which may be useful for certain products or situations.
- In an embodiment, the rim may be a ribbon mounted onto the outer periphery of the circular core along an edge of said ribbon.
- By a ribbon is meant a primarily rectangular piece of material bent to fit the outer periphery of the circular core. Thus, the ribbon comprises two side edges and two end edges, said end edges being joined to form a circular ribbon. One of said side edges are mounted on the outer periphery of the circular core, such that the abrading wheel resembles a bowl.
- Thereby, the thickness of the circular core may be smaller than the width of the rim, such that the inner surface of the rim is exposed to air. It is noted that the mounting may be through welding, or the mounting may be through means of pressing, stamping, or casting the abrading wheel in a single piece.
- In an embodiment, a tongue may be attached to each opening of the circular core, a plurality of tongues thereby being arranged in said circular core.
- In an embodiment, the tongues may be formed from excess material bent away from the opening, the tongues thereby being an integral part of the circular core.
- In an embodiment, the tongues are oriented such that air is forced onto the inner surface of the rim, thereby providing air cooling to the abrading wheel.
- By a tongue is meant a partially free piece of material freed from the circular core. Thus, a tongue and an opening may be formed simultaneously by making appropriate cuts in the circular core, followed by bending an uncut edge away from the plane of the circular core. Thereby, the tongue is attached to the circular core through the bow and may therefore be considered an integral part of the circular core. Thus, the openings may be said to comprise integrated tongues. The tongues may be said to be cooling tongues. The tongues may be regarded as wings. Preferably, the plurality of tongues are bent towards an inner volume partly defined by the inner surface of the rim and the circular core. Preferably, the tongues are arranged in a homogenous pattern, such that the tongues are positioned identically relative to the opening for all openings provided in the circular core. Preferably, the openings are quasi-quadratic and the uncut edge is oriented orthogonally to the outer periphery of the circular hub.
- Thereby, passive means for guiding an air flow onto the inner surface of the rim is realised. By passive means is meant that said air flow is pulled into the abrading wheel and guided onto the inner surface of the rim by the combination of high rotation speed of the abrading wheel and the orientation of the tongues. Said orientation of the tongues is chosen to maximise the air flow onto the inner surface of rim during high speed rotation of the abrading wheel. Thereby, the passive means for guiding an air flow onto the inner surface of the rim provides passive cooling means of the abrading wheel. Thereby, said passive cooling means causes a lower working temperature of the abrading wheel.
- In an embodiment, the grit material may form an overhang above said grooves.
- By an overhang is meant that free space is provided between the outer surface of the rim and parts of the grit material disposed primarily on the spaces between the grooves.
- Thereby, the combined surface area of grit material exposed to the surroundings is increased compared to a situation where no overhang is provided. Thus, when using the abrading wheel for grinding a product, a larger part of said product may be in contact with the grit thereby increasing the efficiency of the abrading wheel. Further, the amount of grit may be increased by allowing an overhang while maintaining the presence of grit-free grooves for avoiding accumulation of particles as described earlier. Moreover, an increased surface area of grit material results in an increased amount of heat dissipation thereby increasing the cooling abilities of the abrading wheel.
- In an embodiment, the grit material may be tungsten carbide.
- Thereby, the grit material has a hardness superior to most materials which it is expected to grind. Materials possessing similar hardness, such as silicon carbide, are foreseen within the scope of the invention.
- In an embodiment, the grit size may be between 14 and 220.
- The grit size disclosed is standardised according to Federation of European Producers of Abrasives (FEPA). A grit size of 14 corresponds to a particle size (mean diameter) of 1.47 mm, and a grit size of 220 corresponds a particle size (mean diameter) of 0.058 mm.
- Thereby, the grit may be varied according to use and the desired smoothness of the grinded product.
- In an embodiment, the abrading wheel may be mounted onto a rotation tool, said rotation tool being capable of providing rotation around a central axis of the abrading wheel.
- Preferably, the mounting is done by engaging a rotational part of the rotation tool in the central aperture and the indentation, where said central aperture and indentation corresponds to the dimension of the rotational tool and a protrusion in said rotational part, respectively. Thereby, the abrading wheel may be set in an efficient and secure rotation.
- In the following, example embodiments are described according to the invention, where
-
Fig. 1 illustrates a perspective view of an abrading wheel according to the invention. -
Fig. 2 illustrates a second perspective view of an abrading wheel according to the invention. -
Fig. 3 illustrates a top view of an abrading wheel according to the invention. -
Fig. 4 illustrates a plurality of cross-sectional views of an abrading wheel according to the invention. -
Fig. 5 illustrates an example of an outer surface of an abrading wheel according to the invention. -
Fig. 6 illustrates a second example of an outer surface of an abrading wheel according to the invention. -
Fig. 7 illustrates a close up cross-sectional view of a groove in an outer surface on an abrading wheel according to the invention. - In the following, the invention is described in detail through embodiments thereof that should not be thought of as limiting to the scope of the invention.
-
Fig. 1 is a perspective view of a part of anabrading wheel 100 according to the invention. Theabrading wheel 100 comprises acircular core 101 having anouter periphery 103 and acentral aperture 105. Saidcentral aperture 105 is arranged in adepression 109. Saiddepression 109 protrudes into an inner volume (not shown) partly defined by saidcircular core 101 and arim 111 arranged orthogonally to saidcore 101 on saidouter periphery 103. Thus, theabrading wheel 100 may be said to be bowl-shaped with acentral depression 109. Preferably, thedepression 109 is an integral part of the core 101 therefore being considered as part of the core 101 in this context. Preferably, thecentral aperture 105 comprises at least oneindentation 107 for mounting theabrading wheel 100 securely onto a rotation tool (not shown). Theindentation 107 may be formed to correspond to a protrusion on said rotation tool (not shown). Said rotation tool may be used to rotate theabrading wheel 100 around a central axis L by engaging with thecentral aperture 105 and the at least oneindentation 107. Therim 111 may be either mounted through e.g. welding onto theouter periphery 103 of thecore 101, or the combinedrim 111 andcore 101 may be formed from a single piece of material, such that theouter periphery 103 is formed when bending/stamping said single piece of material. Alternatively, thecore 101 andrim 111 are formed in a casting process. Thecore 101 is equipped with a plurality ofopenings 121. Preferably, saidopenings 121 are arranged equiangularly in a circular pattern at a fixed distance from a centre point of thecentral opening 105. Theopenings 121 are equipped withtongues 123, saidtongues 123 preferably being an integral part of thecore 101 and formed from bending the material along anuncut edge 124. For example, theopenings 121 may be rectangular, such that thetongues 123 are formed from cutting along three edges thus leaving a fourth edge uncut and thereby allowing said fourth edge to be bent. Preferably, thetongues 123 are bent towards the inner volume (not shown). Preferably, thetongues 123 are bent evenly for allopenings 121, such that a homogenous pattern of theopenings 121 andtongues 123 is formed. When theabrading wheel 100 is set into rotation by a rotation tool, the tongues and accompanying openings draw in an air flow, such that said air is forced onto an inner surface (not shown) of therim 111. Thereby, said air flow provides air cooling of the abrading wheel. Air cooling is essential when using theabrading wheel 100 for grinding purposes, where heating may occur due to friction. - The
rim 111 is arranged orthogonally to the plane of thecore 101, i.e. the rim extends in a direction parallel to the central axis L. The rim comprises anouter surface 113 and an inner surface (not shown). The inner surface is oriented towards the inner volume (not shown) of theabrading wheel 100 partly defined by thecore 101 and therim 111. Theouter surface 113 comprises a plurality ofgrooves 131, for example carved into said outer surface. Said plurality ofgrooves 131 twists around the central axis L. Preferably, thegrooves 131 are arranged in a helix with an axis collinear and coinciding with the central axis L. The helix and thegrooves 131 sketched inFig. 1 are highly exaggerated. Alternatively, thegrooves 131 are parallel to each other and to theouter periphery 103 of thecore 101. Alternatively, thegrooves 131 are tilted relative to theouter periphery 103. Between saidgrooves 131, intermediate protrudingspaces 132 are formed, saidspaces 132 inevitably having the same course, e.g. a helix, as thegrooves 131. Agrit material 141 is disposed primarily onto saidspaces 132 thereby leaving thegrooves 131 free ofgrit material 141. SeeFig. 5a andFig. 6a for a cross-sectional view of thegrooves 131, thespaces 132 and the disposedgrit material 141.Said grit material 141 is made from a hard material such as tungsten carbide having a hardness of 9 on the Mohs-scale. When theabrading wheel 100 is set into rotation and a product is applied onto the grit, thegrit material 141 grinds said product. Due to the absence ofgrit material 141 in thegrooves 131, particles grinded off the applied product are less likely to accumulate in the grooves thereby increasing the lifetime of theabrading wheel 100. In otherwords, particles entering thegrooves 131 are free to move and eventually escape saidgrooves 131, contrary to the case whereingrit material 141 would be disposed in thegrooves 131, whereby particles would get trapped and accumulate more easily. - By arranging the
grooves 131 and accompanyingintermediate spaces 132 in a helix or tilted relative to theouter periphery 103, a larger amount ofgrit material 141 makes contact with the product to be grinded at any given time during rotation of theabrading wheel 100, assuming the product makes normal incident onto therim 111. In other words, the helix arranged or tiltedgrooves 131 andspaces 132 provide an increased free space for a product making contact to thegrit material 132 disposed in thespaces 132. Thus, by thegrooves 131 and accompanyingspaces 132 being tilted or arranged in a helix, the grinding efficiency of theabrading wheel 100 is increased. - A further effect of the
grooves 131 and the accompanyingintermediate spaces 132 being arranged in a helix or tilted relative to theouter periphery 103 is that the particles formed by grinding a product on theabrading wheel 100 are guided out of the abrading wheel. In other words,grooves 131 arranged in a helix or tilted inevitably comprise ends 133 terminating along an edge of therim 111, where said ends 133 allow the particles to escape theabrading wheel 100. - The presence of
grooves 131 further increases the surface area of theabrading wheel 100 which in turn increases the dissipation of heat and thereby increases the cooling capabilities of saidabrading wheel 100. -
Fig. 2 is a perspective view of the part of theabrading wheel 100 ofFig. 1 shown from another angle. In this view, the inner volume partly defined by thecore 101 and therim 111 is exposed. Theinner surface 115 of the rim is shown in this view. Thedepression 109 protrudes into said inner volume. Thecentral aperture 105 and theindentation 107 are partly visible. Thetongues 123 are shown to be bent into the inner volume along anuncut edge 124. Further, theopenings 121 are shown to be cut along threeedges uncut edge 124 uncut. Thetongues 123 are all bent along the sameuncut edge 124 relative to thecore 101 thereby forming a homogenous pattern along the entire diameter along which theopenings 121 are arranged. Preferably, theuncut edge 124 is orthogonal to therim 111. Agrit material 141 is disposed on spaces between a plurality of grooves (not shown in this embodiment) on theouter surface 113 of therim 111. Thegrit material 141 is shown in further detail inFig. 5 andFig. 6 . -
Fig. 3 shows a top view of theabrading wheel 100. The top view exposes the inner volume. The direction of the central axis L serves as reference toFig. 1 . The plurality ofopenings 121 is shown withouttongues 123. However, it should be noted that in the case of saidtongues 123 being an integral part of thecore 101, it is not optional to detach or attach saidtongues 123. The plurality ofopenings 121 is shown to be equiangularly spaced on thecore 101 around the central axis L. Thecentral aperture 105 is shown to be arranged symmetrically around the central axis L. Theabrading wheel 100 is shown with twoindentations 107, 107', for improved stability when mounting the abrading wheel onto a rotation tool (not shown). Thedepression 109 is indicated by a dotted line. Thegrit material 141 is shown disposed on anouter surface 113 of therim 111. Three cross sections, A-A, B-B, and C-C, are indicated inFig. 4 and described in further detail below. -
Fig. 4 shows the cross sections indicated inFig. 3 . -
Fig. 4a illustrates the cross section A-A comprising two of the plurality ofopenings 121. Thetongues 123 are shown to be an integral part of thecore 101 and being bent along anuncut edge 124 indicated by a dotted line. -
Fig. 4b illustrates the cross section B-B. Thetongue 123 attached to theopening 121 is shown as a displaced dotted box due to the choice of viewing angle. Therim 111 is shown being arranged orthogonally to thecore 101. An edge of therim 101 is shown to be mounted onto theouter periphery 103 of thecore 101, therim 111 thereby forming an acute angle of 90 degrees and an obtuse angle of 270 degrees relative to thecore 101. Therim 111 comprises a plurality ofgrooves 131 arranged in theouter surface 113. The plurality ofgrooves 131 are separated by a plurality ofspaces 132. Agrit material 141 is disposed onto saidspaces 132. -
Fig. 4c illustrates the cross section C-C. The abrading wheel is rotationally symmetric around the central axis L. The direction of the central axis L corresponds to the direction given fromFig. 1 . Thedepression 109 protrudes towards the inner volume partly formed by thecore 101 and therim 111. More specifically, thedepression 109 displaces thecentral aperture 105 towards a midway point defined from the width of therim 111. Thereby, stability of theabrading wheel 100 is increased when saidabrading wheel 101 is exposed to rotational forces. -
Fig. 5 andFig. 6 show two possible excerpts of theouter surface 113. For reference, the orientation of the excerpts relative to therim 111 is indicated by the directions x and z which are further defined inFig. 1 . A cross view of each excerpt is shown inFig. 5a andFig 6a . The excerpts are examples of possible arrangements of thegrooves 131 and accompanyingspaces 132 thereby not limiting the scope of the invention. -
Fig. 5 illustrates an excerpt of anouter surface 113 comprising a large separation ofgrooves 131, i.e.large spaces 132. Further, thegrooves 131 and the accompanyingspaces 132 are tilted at anangle 1 relative to the x-direction. The tilt forms a helix along the circumference of therim 111 and around an axis coinciding with the central axis L (not shown). Thegrit material 141 is disposed on thespaces 132, such that thegrooves 131 are free ofgrit material 141. A shaded triangle indicates apossible impact area 150 for a product to be grinded by theabrading wheel 100. During rotation, a product making normal incident, i.e. "entering" the grit from theshort cathetus 150a, as shown by the direction of the arrow E, makes impact with thegrit material 141 along the entire length of thehypotenuse 150c. In the case ofnon-tilted grooves 131 andspaces 132, the impact would be reduced to the width of thespaces 132 onto which thegrit material 141 is disposed. Thereby, saidimpact area 150 illustrates the increased efficiency of theabrading wheel 100, when thegrooves 131 and accompanyingspaces 132 are arranged in a helix or tilted. -
Fig. 5a illustrates a cross-sectional view of the excerpt inFig. 5 . Preferably, thegrooves 131 are V-shaped as illustrated. Preferably, thegrit material 141 overhangs parts of thegrooves 131 illustrated by theoverhang 142. -
Fig. 6 and Fig. 6a (cross-sectional view) illustrate an excerpt of anouter surface 113 comprising a small separation ofgrooves 131, i.e.narrow spaces 132. Further, the tilt given by theangle 1 is smaller than the excerpt illustrated inFig. 5 . -
Fig. 7 illustrates a close-up cross-sectional view of a V-shapedgroove 131 andgrit material 141 disposed primarily onintermediate spaces 132 between saidgrooves 131. It is noted how anoverhang 142 ofgrit material 141 is formed, such that free space is provided between the slopes of the groove and saidgrit material 141. -
- E
- Entering direction of product
- L
- Central axis
- 1
- Angle relative to x-direction
- 100
- Abrading wheel
- 101
- Circular core
- 103
- Outer periphery
- 105
- Central aperture
- 107
- Indentation
- 109
- Depression
- 111
- Rim
- 113
- Outer surface
- 115
- Inner surface
- 121
- Openings
- 123
- Tongues
- 124
- Uncut edge
- 131
- Grooves
- 132
- Spaces
- 133
- End of
groove 131 - 141
- Grit material
- 142
- Overhang
- 150
- Impact area
- 150a
- Cathetus
- 150c
- Hypotenuse
- 221
- Edge
- 222
- Edge
- 223
- Edge
Claims (9)
- An abrading wheel comprising- a circular core (101) having an outer periphery (103),- a rim (111) arranged orthogonally to said circular core on said outer periphery, said rim comprising an inner surface (115) and an outer surface (113), and
a grit material (141) disposed on at least part of said outer surface (113),- wherein the outer surface (113) of said rim (111) is provided with a plurality of grooves (131) twisting around a central axis (L) of the abrading wheel and arranged in a helix or tilted relative to the outer periphery (103), the grooves being substantially free of grit material, and where a main part of said grit material (141) is disposed on said outer surface of said rim on spaces (132) between said grooves, whereby particles formed from a product being ground are guided away from the abrading wheel along said grooves,- characterised in that- a plurality of openings (121) are arranged in said core (101) for providing an airflow directed towards said inner surface (115), a tongue being attached to each opening of the circular core, a plurality of tongues thereby being arranged in said circular core, wherein the tongues are oriented such that air is forced onto the inner surface of the rim, thereby providing air cooling to the abrading wheel. - An abrading wheel according to claim 1, wherein the circular core comprises a central axis and a central aperture for mounting the abrading wheel on a rotation tool.
- An abrading wheel according to claims 1 and 2, wherein the cross section of the grooves are V-shaped.
- An abrading wheel according to any of the preceding claims, wherein the rim is a ribbon mounted onto the outer periphery of the circular core along an edge of said ribbon.
- An abrading wheel according to any of the preceding claims, wherein the tongues are formed from excess material bent away from the openings, the tongues thereby being an integral part of the circular core.
- An abrading wheel according to any of the preceding claims, wherein the grit material forms an overhang above said grooves.
- An abrading wheel according to any of the preceding claims, wherein the grit material is tungsten carbide
- An abrading wheel according to any of the preceding claims, wherein the grit size is between 14 and 220, wherein a grit size of 14 corresponds to a particle size as mean diameter of 1.47 mm, and a grit size of 220 corresponds to a particle size as mean diameter of 0.058 mm.
- An abrading wheel according to any of the preceding claims, wherein said abrading wheel is mounted onto a rotation tool, said rotation tool being capable of providing rotation around a central axis of the abrading wheel.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22171607.9A EP4074459A1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
ES21195510T ES2924097T3 (en) | 2017-03-31 | 2017-03-31 | Improved abrasion wheel |
PL17715119T PL3600771T3 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
PT211955109T PT3957438T (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP21195510.9A EP3957438B1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
DK21195510.9T DK3957438T3 (en) | 2017-03-31 | 2017-03-31 | IMPROVED GRINDING DISC |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2017/057724 WO2018177541A1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
Related Child Applications (4)
Application Number | Title | Priority Date | Filing Date |
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EP22171607.9A Division EP4074459A1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP21195510.9A Division-Into EP3957438B1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP21195510.9A Division EP3957438B1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP21186309.7 Division-Into | 2021-07-19 |
Publications (2)
Publication Number | Publication Date |
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EP3600771A1 EP3600771A1 (en) | 2020-02-05 |
EP3600771B1 true EP3600771B1 (en) | 2022-03-30 |
Family
ID=58464553
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22171607.9A Withdrawn EP4074459A1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP21195510.9A Active EP3957438B1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP17715119.8A Active EP3600771B1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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EP22171607.9A Withdrawn EP4074459A1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
EP21195510.9A Active EP3957438B1 (en) | 2017-03-31 | 2017-03-31 | Improved abrading wheel |
Country Status (12)
Country | Link |
---|---|
US (1) | US20210162565A1 (en) |
EP (3) | EP4074459A1 (en) |
CN (1) | CN110621443A (en) |
BR (1) | BR112019019667B1 (en) |
CA (1) | CA3056693C (en) |
DK (2) | DK3957438T3 (en) |
ES (2) | ES2924097T3 (en) |
MX (1) | MX2019011498A (en) |
NZ (1) | NZ757271A (en) |
PL (2) | PL3600771T3 (en) |
PT (2) | PT3600771T (en) |
WO (1) | WO2018177541A1 (en) |
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FR3134326B1 (en) | 2022-04-07 | 2024-03-15 | Yona Chocard | VENTILATION DEVICE FOR AN ABRASIVE WHEEL AND ABRASIVE WHEEL COMPRISING SUCH A VENTILATION DEVICE |
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US2049874A (en) * | 1933-08-21 | 1936-08-04 | Miami Abrasive Products Inc | Slotted abrasive wheel |
US2047649A (en) * | 1935-11-06 | 1936-07-14 | Harry G Robinson | Abrasive wheel |
US3579928A (en) * | 1969-07-14 | 1971-05-25 | Gerhard R Held | Self-air cooling abrading wheel |
US3916579A (en) * | 1975-02-10 | 1975-11-04 | Tunco Manufacturing Inc | Slotted abrasive wheel |
US4516560A (en) * | 1982-07-29 | 1985-05-14 | Federal-Mogul Corporation | Abrasive cutting wheel and method of cutting abradable material |
JPH052293Y2 (en) * | 1986-05-30 | 1993-01-20 | ||
IT232262Y1 (en) * | 1993-09-24 | 1999-12-17 | Quintilio Lupi | ELASTIC BASE WHEEL FOR SANDING AND POLISHING TOROIDAL PROFILES IN HARD MATERIALS. |
US5611724A (en) * | 1995-12-01 | 1997-03-18 | General Electric Company | Grinding wheel having dead end grooves and method for grinding therewith |
US6007415A (en) * | 1995-12-08 | 1999-12-28 | Norton Company | Sanding disks |
FR2752762B1 (en) * | 1996-08-29 | 1998-10-02 | Snecma | GRINDING WHEEL WITH BUILT-IN WATERING |
JP4566375B2 (en) * | 2000-09-26 | 2010-10-20 | 天龍製鋸株式会社 | Metal bond tool |
US20050064799A1 (en) * | 2003-09-24 | 2005-03-24 | Inland Diamond Products Company | Ophthalmic roughing wheel |
JP5034427B2 (en) * | 2006-10-12 | 2012-09-26 | 株式会社ジェイテクト | Method for releasing dynamic pressure of grinding fluid in grinding, grinding method using the method, and grinding wheel used in the grinding method |
JP5100225B2 (en) * | 2006-11-06 | 2012-12-19 | 株式会社ジェイテクト | Inclined grooved whetstone and manufacturing method thereof |
CN101386155A (en) * | 2008-07-25 | 2009-03-18 | 浙江迪邦达轴承有限公司 | Grinding wheel for grinding large contact surface |
CN101890678B (en) * | 2009-05-19 | 2011-09-28 | 好来化工(中山)有限公司 | Grinding wheel and polishing device with same |
US8597079B2 (en) * | 2011-01-07 | 2013-12-03 | Inland Diamond Products Company | Abrasive wheel with closed profiles in cutting surface |
KR20150083733A (en) * | 2014-01-10 | 2015-07-20 | 주식회사 세한텍 | Grinding wheel for glass sheet |
CN205218870U (en) * | 2015-12-25 | 2016-05-11 | 郑州磨料磨具磨削研究所有限公司 | Novel diamond bistrique of structure |
-
2017
- 2017-03-31 PL PL17715119T patent/PL3600771T3/en unknown
- 2017-03-31 EP EP22171607.9A patent/EP4074459A1/en not_active Withdrawn
- 2017-03-31 ES ES21195510T patent/ES2924097T3/en active Active
- 2017-03-31 PL PL21195510.9T patent/PL3957438T3/en unknown
- 2017-03-31 BR BR112019019667-6A patent/BR112019019667B1/en active IP Right Grant
- 2017-03-31 EP EP21195510.9A patent/EP3957438B1/en active Active
- 2017-03-31 CN CN201780089252.8A patent/CN110621443A/en active Pending
- 2017-03-31 DK DK21195510.9T patent/DK3957438T3/en active
- 2017-03-31 DK DK17715119.8T patent/DK3600771T3/en active
- 2017-03-31 EP EP17715119.8A patent/EP3600771B1/en active Active
- 2017-03-31 CA CA3056693A patent/CA3056693C/en active Active
- 2017-03-31 WO PCT/EP2017/057724 patent/WO2018177541A1/en active Search and Examination
- 2017-03-31 US US16/497,735 patent/US20210162565A1/en active Pending
- 2017-03-31 ES ES17715119T patent/ES2915555T3/en active Active
- 2017-03-31 MX MX2019011498A patent/MX2019011498A/en unknown
- 2017-03-31 PT PT177151198T patent/PT3600771T/en unknown
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Also Published As
Publication number | Publication date |
---|---|
BR112019019667A2 (en) | 2020-04-22 |
US20210162565A1 (en) | 2021-06-03 |
PL3600771T3 (en) | 2022-06-20 |
CN110621443A (en) | 2019-12-27 |
BR112019019667B1 (en) | 2022-09-27 |
PL3957438T3 (en) | 2022-08-16 |
CA3056693C (en) | 2022-05-03 |
MX2019011498A (en) | 2019-11-01 |
DK3957438T3 (en) | 2022-08-29 |
EP3957438A1 (en) | 2022-02-23 |
EP3600771A1 (en) | 2020-02-05 |
NZ757271A (en) | 2022-02-25 |
PT3957438T (en) | 2022-08-17 |
PT3600771T (en) | 2022-06-17 |
WO2018177541A1 (en) | 2018-10-04 |
CA3056693A1 (en) | 2018-10-04 |
ES2924097T3 (en) | 2022-10-04 |
DK3600771T3 (en) | 2022-05-09 |
EP4074459A1 (en) | 2022-10-19 |
EP3957438B1 (en) | 2022-06-15 |
ES2915555T3 (en) | 2022-06-23 |
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