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EP4344823A1 - Segment de meulage et disque à disque avec segments de meulage - Google Patents

Segment de meulage et disque à disque avec segments de meulage Download PDF

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Publication number
EP4344823A1
EP4344823A1 EP22198652.4A EP22198652A EP4344823A1 EP 4344823 A1 EP4344823 A1 EP 4344823A1 EP 22198652 A EP22198652 A EP 22198652A EP 4344823 A1 EP4344823 A1 EP 4344823A1
Authority
EP
European Patent Office
Prior art keywords
grinding
superabrasive particles
bond material
segment
height
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.)
Withdrawn
Application number
EP22198652.4A
Other languages
German (de)
English (en)
Inventor
Mohammed Khalid
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP22198652.4A priority Critical patent/EP4344823A1/fr
Priority to PCT/EP2023/076921 priority patent/WO2024068854A1/fr
Priority to EP23782520.3A priority patent/EP4594051A1/fr
Publication of EP4344823A1 publication Critical patent/EP4344823A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • B24D99/005—Segments of abrasive wheels
    • 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
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
    • 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
    • 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
    • B24D7/06—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 with inserted abrasive blocks, e.g. segmental
    • B24D7/063—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 with inserted abrasive blocks, e.g. segmental with segments embedded in a matrix which is rubbed away during the grinding process

Definitions

  • the present invention relates to tool bits for grinding materials such as concrete, granite, stone, marble or the like and grinding segments to be connected on such tool bits for grinding, and more particularly to grinding segments in which superabrasive particles are distributed according to a predetermined particle design in a bond material and by which the grinding performance and service life of the tool bit can be improved.
  • Tool bits for grinding are composed of a disc-shaped or cup-shaped basic body, a plurality of grinding segments connected to the basic body, and a plurality of suction holes arranged in the basic body and configured to discharge removed particles.
  • the basic body includes an outer circumferential section, an inner section configured to connect the tool bit to a motorized power tool, and a transition section arranged between the circumferential section and inner section.
  • the grinding segments are connected to the basic body by brazing, soldering, welding or the like, and the suction holes are arranged in at least one of the circumferential section and the transition section of the basic body.
  • Typical grinding segments are manufactured by mixing superabrasive particles with a suitable bond material (e.g., powder). The mixture is compressed in a mold to form a green body, which is then consolidated by free-form sintering, hot-pressing, or infiltrating to form a single grinding segment. Finally, the grinding segments are connected by brazing, soldering, welding or the like to the basic body to form the final tool bit for grinding.
  • a suitable bond material e.g., powder
  • the superabrasive particles During the process of mixing the superabrasive particles with the bond material, the superabrasive particles have a much larger size compared to the particles of the bond material and so tend to freely flow, so that under the condition of a finite overall blending ratio of the superabrasive particles to the bond material, the superabrasive particles may be highly concentrated in certain regions or very deficient below the average concentration in other regions to cause irregular or non-uniform distribution of the superabrasive particles within the grinding segments.
  • the grinding wheel rotates at a certain speed and removes surface parts of stone, concrete, marble, or the like with the torque originating from the motorized power tool, and during the course, the superabrasive particles on the grinding segments experience severe load due to the reactive force of the object in the form of friction, with the result that the superabrasive particles can be worn out, loosened, or even broken.
  • the load of friction imposed on an individual superabrasive particle would be decreased.
  • the superabrasive particles would be in active working and so dulled in the sharp grinding segments or can be subjected to a degradation together with the bond material due to an abrupt frictional heat generation, however the self-regeneration remains at a low level, so that deformation or unevenness on the surface of the grinding wheel can result.
  • the superabrasive particles in the sections of the grinding segments where the concentration of the superabrasive particles is relatively low, are subjected to larger load of friction or impact per unit particle and therefore the superabrasive particles are easily broken, constituting a cause of decreasing the service life of the tool bit.
  • the present invention was created to resolve the problems with the prior art as described above, and the object of the present invention is to provide a grinding segment and a tool bit for grinding equipped with the grinding segments, which allow precise grinding operation thanks to the defined distribution of the superabrasive particles, and which make possible the marked improvement in the grinding performance and/or in the service life of tool bits for grinding.
  • each of the M layers of the bond material has at least one of a structured lower surface and a structured upper surface, wherein the structured lower surfaces and/or structured upper surfaces of the M layers have a first structure that corresponds to the predetermined particle design of the superabrasive particles.
  • the grinding segment is fabricated via powder metallurgy, in which a green body is build up layer by layer and then the green body is further processed by free-form sintering, by hot-pressing and/or by infiltrating to form the final grinding segment.
  • the grinding segment includes a bond material that is at least one of free-form sintered, hot pressed and infiltrated and a plurality of superabrasive particles being arranged according to a predetermined particle design and bonded in the bond material.
  • the grinding segment according to the present invention is composed of at least two layers of the bond material and of at least one pattern of the superabrasive particles, the layers and patterns being stacked in the height direction of the grinding segment.
  • Each of the layers of the bond material has a lower surface and an upper surface and at least one of the lower and upper surfaces of each layer is a structured surface having a first structure that corresponds to the predetermined particle design of the superabrasive particles.
  • the structured lower and/or upper surfaces of each layer enable that the superabrasive particles of a pattern can be arranged on different height levels with height differences between adjacent height levels.
  • the height levels will preferably be selected such that the superabrasive particles of a following height level will be opened at a certain wearout of the superabrasive particles of the previous height level. During grinding with the tool bit for grinding, the active superabrasive particles wear out and their size in the height direction is reduced.
  • the M layers of the bond material include at least a first layer having a first lower surface and a first upper surface, wherein the first upper surface has the first structure, and the first lower surface is non-structured.
  • the first layer has a non-structured first lower surface and a structured first upper surface.
  • the non-structured first lower surface may be used as front side of the grinding segment, the front side being opposite of a back side of the grinding segment, and the grinding segment being connected via the back side to the basic body of a tool bit.
  • the M layers of the bond material include at least a first layer having a first lower surface and a first upper surface, wherein the first upper surface has the first structure, and the first lower surface has a second structure that is different from the first structure of the first upper surface.
  • the first layer has a structured first upper surface and a structured first lower surface, the first structure of the first upper surface being different from the second structure of the first lower surface.
  • the structured first lower surface may be used as front side of the grinding segment, the front side being opposite of a back side of the grinding segment, and the grinding segment being connected via the back side to a basic body of a tool bit.
  • a structured first lower surface as front side may have the advantage that the surface area of the front side that is in contact with the basic body of the tool bit is reduced.
  • a decreased surface area may be preferred.
  • the M layers of the bond material include at least a M-th layer having a M-th lower surface and a M-th upper surface, wherein the M-th lower surface and the M-th upper surface have the first structure.
  • the structured M-th upper surface may be used as back side of the grinding segment, the grinding segment being connected via the back side to a basic body of a tool bit.
  • the bond material is at least one of a first bond material and a second bond material, the second bond material being different from the first bond material.
  • the grinding segment is composed of at least two layers of the bond material and of at least two patterns of the superabrasive particles.
  • the superabrasive particles are arranged according to a predetermined particle design and fixed by the bond material that is at least one of free-form sintered and hot-pressed.
  • the first bond material may be used to fix the superabrasive particles and the second bond material may be used in a contact area with the connection face to allow welding of the grinding segment.
  • the layers of bond material may comprise a first bond material and second bond material
  • the first bond material may be applied to inner regions of the layers to fix the superabrasive particles
  • the second bond material may be applied to outer regions of the layers to strengthen the side surfaces of the grinding segment.
  • each pattern of superabrasive particles includes at least two groups of K, K ⁇ 2 lines of the superabrasive particles, the superabrasive particles of adjacent lines being arranged on different height levels in the height direction.
  • the grinding segment is composed of at least one pattern of the superabrasive particles, the patterns being stacked in the height direction.
  • the superabrasive particles are arranged according to the predetermined particle design that includes two or more groups of at least two lines of the superabrasive particles.
  • the number of groups is preferably adapted to the abrasiveness of the workpiece to be grinded and/or the expected lifetime of the grinding segment.
  • the superabrasive particles are arranged on a similar height level in the height direction, and the superabrasive particles of adjacent lines are arranged on different height levels.
  • the number of lines and the height levels of the different types of lines may be selected such that the superabrasive particles of the next type of lines are opened before the superabrasive particles positioned just above have been worn out at a certain percentage, so that self-regeneration of the superabrasive particles may be repeated for the service time of the grinding segment.
  • the height levels of the last type of lines of a previous pattern and the first type of lines of a following pattern may be selected such that the superabrasive particles of the next type of lines are opened before the superabrasive particles of the last line positioned just above have been worn out at a certain percentage, so that self-regeneration of the superabrasive particles may be repeated for the service time of the grinding segment.
  • each of the at least two groups comprises a first line of superabrasive particles, a second line of superabrasive particles, and a third line of superabrasive particles, wherein the first lines being arranged on a first height level, the second lines being arranged on a second height level, and the third lines being arranged on a third height level, and wherein the first height level, second height level and third height level being different from each other in the height direction.
  • the superabrasive particles are arranged according to the predetermined particle design that includes two or more groups of a first line, a second line, and a third line of superabrasive particles, wherein the superabrasive particles of the first, second, and third line are arranged on the first, second, and third height level.
  • the height differences between the first and second height level and between the second and third height level are substantially equal.
  • the lines of superabrasive particles of each group define a linear arrangement and the superabrasive particles of the adjacent lines will become active one after the other.
  • the height differences between the first and second height level and between the second and third height level are different from each other.
  • the lines of superabrasive particles of each group define a non-linear arrangement that helps in retaining a more uniform wearout at the edges of the grinding segment and keeping the tool bit grinding for the service life.
  • each of the at least two groups further comprises a fourth line of superabrasive particles, wherein the fourth lines being arranged on a fourth height level, and wherein the fourth height level is different from the first height level, second height level and third height level in the height direction.
  • the number of lines of each group and the height differences between the lines may be selected such that the superabrasive particles of a line will be opened at a certain wearout of the superabrasive particles of the previous line.
  • each of the at least two groups may further comprise a fifth line of superabrasive particles, wherein the fifth lines being arranged on a fifth height level, and wherein the fifth height level is different from the first height level, second height level, third height level, and fourth height level in the height direction.
  • the number of lines of each group and the height differences between the lines may be selected such that the superabrasive particles of a line will be opened at a certain wearout of the superabrasive particles of the previous line.
  • a tool bit for grinding comprising a basic body including an inner section configured to connect the tool bit to a power tool, and a circumferential section with a connection surface, and two or more grinding segments according to the invention, wherein the grinding segments are connected to the connection surface.
  • the tool bit comprises a disc-shaped or cup-shaped basic body and two or more grinding segments.
  • the grinding segments comprise a front side and a back side opposite of the front side, and the grinding segments being connected via the back side to the basic body.
  • a tool bit according to the invention may have a similar performance over the lifetime since the superabrasive particles are distributed in the grinding segment according to the predetermined particle design.
  • the grinding segments are connected to the connection surface with the upper surface of the M-th layer of the bond material.
  • the grinding segments are composed of M, M ⁇ 2 layers of the bond material and of N, N ⁇ 1 patterns of the superabrasive particles, the layers and patterns being stacked in the height direction of the grinding segment.
  • Each of the M layers of the bond material has at least one of a structured lower surface and a structured upper surface.
  • the tool bit further comprises a plurality of suction holes being arranged in at least one of the circumferential section or a transition section that is arranged between the circumferential section and inner section.
  • the phrase "at least one" in reference to a list of one or more elements should be understood to mean at least one element selected from any one or more of the elements in the list of elements, but not necessarily including at least one of each and every element specifically listed within the list of elements and not excluding any combinations of elements in the list of elements.
  • This definition also allows that elements may optionally be present other than the elements specifically identified within the list of elements to which the phrase "at least one" refers, whether related or unrelated to those elements specifically identified.
  • the term “segment” means a piece or fragment substantially in the form of a sector, particularly used for the purpose of cutting, grinding, sawing, drilling or the like as well.
  • the term “bond material” refers to a material to which superabrasive particles may be bonded. Bond materials typically consist of a base powder, which is combined with compression auxiliaries and additives which serve to optimize the properties of the base powder material with regard to the strength and wear rate of the segments.
  • the base powder may consist of one base material or be composed of several base materials.
  • superabrasive particles refer to particles of either natural or synthetic diamond, super hard crystalline, or polycrystalline substance, or mixtures of substances and include but are not limited to diamond, polycrystalline diamond (PCD), cubic boron nitride (CBN), and polycrystalline cubic boron nitride (PCBN).
  • predetermined particle design refers to a non-random particle design of the superabrasive particles that is identified prior to construction of a tool bit, and which individually places or locates each superabrasive particle in a defined relationship with the other superabrasive particles, and with the configuration of the tool bit.
  • FIGS. 1A , B show a tool bit 10 for grinding according to the present invention.
  • the tool bit 10 is formed as cup-shaped grinding wheel and comprises a cup-shaped basic body 11, a plurality of grinding segments 12 according to the present invention, and a plurality of suction holes 13.
  • the grinding segments 12 are connected via a back side 14 to the basic body 11.
  • FIG. 1A shows the grinding wheel 10 in a view on a front side 15 opposite to the back side 14 of the grinding segments 12 and FIG. 1B the grinding wheel 10 in a cross-section parallel to an axis of rotation 16 of the grinding wheel 10.
  • the basic body 11 is composed of an outer circumferential section 17, an inner section 18, and a conical transition section 19 that is arranged between the circumferential section 17 and inner section 18.
  • the circumferential section 17 is ring-shaped and includes several concentrical grooves 21, which form a structured connection surface 22, to which the grinding segments 12 are fixed, e.g., by brazing, soldering, welding, or the like as well.
  • the circumferential section 17 may include a plane connection surface, to which the grinding segments 12 can be fixed.
  • the grinding segments 12 may have a L-shaped, boomerang-shaped, rectangular, triangular or the like as well cross-section perpendicular to a height direction of the grinding segment.
  • the suction holes 13 may be arranged in the circumferential section 17 or in the transition section 19 and may be equally distributed in one row or in two concentric rows; alternatively, first suction holes may be arranged in the circumferential section 17 and second suction holes in the transition section 19.
  • the grinding segments 12 and suction holes 13 are equally spaced along the circumferential section 17, and in the circumferential direction, each of the suction holes 13 is arranged between two adjacent grinding segments 12.
  • the number, size and/or position of the suction holes 13 may vary and be selected such that a discharge of particles removed by the grinding wheel 10 can be optimized.
  • the suction holes 13 can create an airstream, which allows to cool the grinding segments 12 and to discharge removed particles during grinding operation.
  • FIGS. 2A , B show one of the grinding segments 12 of the grinding wheel 10 in a view on the back side 13 of the grinding segment 12 ( FIG. 2A ), which is composed of a bond material 23 and superabrasive particles 24 being arranged according to a predetermined particle design ( FIG. 2B ).
  • the grinding segment 12 is fabricated via powder metallurgy, in which a green body is build up layer by layer from a powdery or granular bond material and a plurality of the superabrasive particles 24 and the green body is further processed to form the grinding segment 12 by free-form sintering, hot-pressing, or infiltrating.
  • the grinding segment 12 comprises a substantially triangular cross-section with rounded edges perpendicular to a height direction H of the grinding segment 12.
  • the back side 13 of the grinding segment 12 is structured and the front side 14 is non-structured.
  • FIG. 2B shows the predetermined particle design of the superabrasive particles 24, which are arranged in two patterns.
  • Each of the three groups G 1 , G 2 , G 3 includes a first line l 1 , a second line l 2 , a third line l 3 , and a fourth line l 4 of superabrasive particles 24.
  • the number of the superabrasive particles 24 in a line can vary and may depend on the cross-section of the grinding segment 12.
  • the fourth line l 4 comprises seven superabrasive particles 24 in the first group G 1 , eight superabrasive particles 24 in the second group G 2 , and three superabrasive particles 24 in the third group G 3 .
  • the distances between adjacent superabrasive particles 24 in a line can vary and may be adapted to the application of the grinding wheel 10 and the workpiece to be grinded.
  • the bond material and superabrasive particles used for the grinding segments should also be different.
  • the bond material should be softer to let the new superabrasive particles be exposed more easily and participate in grinding, and, when the workpiece to be grinded is soft, the bond material should be harder to hold the superabrasive particles longer to extend the service life of the grinding segments.
  • FIGS. 3A , B show a cross-section of the grinding segment 12 of FIG. 2A in a plane parallel to the height direction H of the grinding segment 12 ( FIG. 3A ) and a detail of FIG. 3A (FIG. 3B ).
  • the grinding segment 12 is made of the bond material 23 that is free-form sintered, hot-pressed or infiltrated and of the superabrasive particles 24 being arranged according to the predetermined particle design shown in FIG. 2B .
  • the two layers of the bond material 23 are called first layer L 1 and second layer L 2
  • the two pattern of the superabrasive particles 24 are called first pattern P 1 and second pattern P 2 .
  • the first layer L 1 has a lower surface that is called first lower surface LS 1 and an upper surface that is called first upper surface US 1 , wherein the first lower surface LS 1 is a non-structured lower surface and the first upper surface US 1 is a structured upper surface, and the second layer L 2 has a lower surface that is called second lower surface LS 2 and an upper surface that is called second upper surface US 2 , wherein the second lower surface LS 2 is a structured lower surface and the second upper surface US 2 is a structured upper surface.
  • the back side 13 of the grinding segment 12 is predetermined by the second upper surface US 2 , and the front side 14 by the first lower surface LS 1 .
  • Each of the first pattern P 1 and second pattern P 2 include the three groups G 1 , G 2 , G 3 of the four lines l 1 , l 2 , l 3 , l 4 of superabrasive particles 24.
  • Each group G 1 , G 2 , G 3 includes a first line l 1 , a second line l 2 , a third line l 3 , and a fourth line l 4 of superabrasive particles 24, wherein the four lines l 1 , l 2 , l 3 , l 4 of each group are arranged on different height levels.
  • the first lines l 1 of the first, second and third group G 1 , G 2 , G 3 are arranged on a first height level h 1
  • the second lines l 2 of the first, second and third group G 1 , G 2 , G 3 are arranged on a second height level h 2
  • the third lines l 3 of the first, second and third group G 1 , G 2 , G 3 are arranged on a third height level h 3
  • the fourth lines l 4 of the first, second and third group G 1 , G 2 , G 3 are arranged on a fourth height level h 4 .
  • the superabrasive particles 24 of the four lines l 1 , l 2 , l 3 , l 4 are arranged on different height levels h 1 , h 2 , h 3 , h 4 , they start grinding at different points of time.
  • the superabrasive particles 24 of the fourth lines l 4 start grinding
  • the superabrasive particles 24 of the third lines l 3 take over grinding
  • the superabrasive particles 24 of the second lines l 2 continue grinding and last the superabrasive particles 24 of the first lines l 1 take over grinding.
  • the superabrasive particles 24 of the first line l 1 and second line l 2 differ in the height direction H by a height distance ⁇ 12
  • the superabrasive particles 24 of the second line l 2 and third line l 3 differ in the height direction H by a height distance ⁇ 23
  • the superabrasive particles 24 of the third line l 3 and fourth line l 4 differ in the height direction H by a height distance ⁇ 34 .
  • the superabrasive particles 24 are arranged such that in a group of lines the height distances ⁇ 12 , ⁇ 23 , ⁇ 34 are nearly equal.
  • the bond material 23 is at least one of a first bond material and a second bond material, the second bond material being different from the first bond material.
  • the first layer L 1 and second layer L 2 may be made from the first bond material that is preferably adapted to the material of the workpiece that should be grinded and selected such that the superabrasive particles 24 are fixed in the first bond material as necessary.
  • the bond material used in the contact area to the connection face 17 must be weldable.
  • the use of a third layer of the second bond material could support welding of the grinding segment 12 to the basic body 11.
  • the third layer of the second bond material would be applied on the structured upper surface US 2 of the second layer L 2 and would have a structured upper surface.
  • the first bond material and second bond material could be used for the first layer L 1 and second layer L 2 .
  • the first bond material could be selected to fix the superabrasive particles 24 and could be applied to inner regions of the first layer L 1 and second layer L 2
  • the second bond material could be selected to strengthen the side surfaces of the grinding segment and could be applied to outer regions of the first layer L 1 and second layer L 2 .
  • FIG. 4 shows how a green body 31 for the grinding segment 12 of FIG. 2A may be manufactured stepwise from a powdery bond material 32 and the superabrasive particles 24.
  • a sequence of a first step, a second step and a third step is performed two times as a first sequence and a second sequence.
  • the sequence of the first step, second step and third step is performed n-times (n ⁇ 2) to manufacture a green body for a segment according to the invention.
  • a first portion of the powdery bond material 32 is applied to a lower punch (step 1-1 ).
  • a first plurality of the superabrasive particles 24 is arranged on the first portion of powdery bond material 32 according to the predetermined particle design shown in FIG. 2B to build a first layer construction LC 1 ( step 1-2 ), wherein the superabrasive particles 24 are arranged on the same height level in the height direction H.
  • the first layer construction LC 1 is compacted via an upper punch that has a structured punching surface ( step 1-3 ).
  • the superabrasive particles 24 are shifted in the height direction H such that superabrasive particles 24 of adjacent lines are arranged on different height levels and a structured upper surface 33 is formed.
  • the superabrasive particles 24 are arranged in three groups of four lines. Each group comprises a first line l 1 of superabrasive particles 24, a second line l 2 of superabrasive particles 24, a third line l 3 of superabrasive particles 24, and a fourth line l 4 of superabrasive particles 24.
  • the second sequence of the first step, second step and third step is performed.
  • a second portion of the powdery bond material 32 is applied to the first layer construction LC 1 (step 2-1 ).
  • a second plurality of the superabrasive particles 24 is arranged according to the predetermined particle design on the second portion of the powdery bond material 32 to build a second layer construction LC 2 ( step 2-2 ), wherein the superabrasive particles 24 are arranged on the same height level in the height direction H.
  • the second layer construction LC 2 is compacted via the structured upper punch ( step 2-3 ). By compacting the second layer construction LC 2 with the structured upper punch, the superabrasive particles 24 are shifted in the height direction H such that superabrasive particles 24 of adjacent lines are arranged on different height levels and a structured upper surface 34 is formed.
  • the green body 31 will be further processed to form the grinding segment 12 by free-form sintering, by hot-pressing and/or by infiltrating.
  • the green body 31 includes a plane lower surface 35 and the structured upper surface 34. After free-form sintering, hot-pressing, or infiltrating, the lower surface 35 will define the front side 14 of the grinding segment 12 and the upper surface 34 will define the back side 13 of the grinding segment 12.
  • FIGS. 5A , B show an alternative grinding segment 42 ( FIG. 5A ) for the grinding wheel 10 of FIG. 1 , the grinding segment 42 being composed of a bond material and superabrasive particles being arranged according to a predetermined particle design ( FIG. 5B ).
  • the grinding segment 42 includes a backside 44 that may be used to connect the grinding segment 42 to the connection surface 22 of the basic body 11 and a front side 45 that may be used to grind a workpiece via the grinding wheel 10.
  • the grinding segment 42 may substitute the grinding segment 12 and may be connected to the basic body 11 of the grinding wheel 10.
  • the grinding segment 12 and the alternative grinding segment 42 are both made of the bond material 23 that is at least one of free-form sintered, hot-pressed, and infiltrated and of the superabrasive particles 24 being arranged according to a predetermined particle design.
  • the number of superabrasive particles 24 used for a pattern and the position of the superabrasive particles 24 in a horizontal plane perpendicular to the height direction H are the same for the grinding segments 12, 42, but the height levels of adjacent lines of superabrasive particles 24 and the structure of the backside is different for the grinding segment 12 and the alternative grinding segment 42.
  • FIG. 5B shows the predetermined particle design of the superabrasive particles 24, which are arranged in patterns.
  • FIGS. 6A , B show a cross-section of the grinding segment 42 of FIG. 5A in a plane parallel to the height direction H of the grinding segment 42 ( FIG. 6A ) and a detail of FIG. 6A (FIG. 6B ).
  • the grinding segment 42 is made of the bond material 23 that is free-form sintered or hot-pressed and of the superabrasive particles 24 being arranged according to the predetermined particle design shown in FIG. 5B .
  • the first layer L 1 has a lower surface that is called first lower surface LS 1 and an upper surface that is called first upper surface US 1 , wherein the first lower surface LS 1 is a non-structured lower surface and the first upper surface US 1 is a structured upper surface, and the second layer L 2 has a lower surface that is called second lower surface LS 2 and an upper surface that is called second upper surface US 2 , wherein the second lower surface LS 2 is a structured lower surface and the second upper surface US 2 is a structured upper surface.
  • the backside 44 of the grinding segment 42 is defined by the second upper surface US 2 , and the front side 45 by the first lower surface LS 1 .
  • Each of the first pattern P 1 and second pattern P 2 include the first, second and third group G 1 , G 2 , G 3 of the four lines l 1 , l 2 , l 3 , l 4 of superabrasive particles 24.
  • Each group G 1 , G 2 , G 3 includes a first line l 1 of superabrasive particles 24 arranged on a first height level h 1 , a second line l 2 of superabrasive particles 24 arranged on a second height level h 2 , a third line l 3 of superabrasive particles 24 arranged on a third height level h 3 , and a fourth line l 4 of superabrasive particles 24 arranged on a fourth height level h 4 .
  • the superabrasive particles 24 of the four lines l 1 , l 2 , l 3 , l 4 are arranged on different height levels, they start grinding at different points of time.
  • the superabrasive particles 24 of the fourth lines l 4 start grinding
  • the superabrasive particles 24 of the second lines l 2 take over grinding
  • the superabrasive particles 24 of the third lines l 3 continue grinding and last the superabrasive particles 24 of the first lines l 1 take over grinding.
  • the superabrasive particles 24 of the first line l 1 and second line l 2 differ in the height direction H by a height distance ⁇ 12
  • the superabrasive particles 24 of the second line l 2 and third line l 3 differ in the height direction H by a height distance ⁇ 23
  • the superabrasive particles 24 of the third line l 3 and fourth line l 4 differ in the height direction H by a height distance ⁇ 34 .
  • the superabrasive particles 24 are arranged such that in a group of lines the height distances ⁇ 12 , ⁇ 23 , ⁇ 34 are not equal.
  • the grinding segment 42 differs in the height distances ⁇ 12 , ⁇ 23 , ⁇ 34 from the grinding segment 12.
  • the height distances ⁇ 12 , ⁇ 23 , ⁇ 34 are nearly equal, and, for the grinding segment 42, the height distances ⁇ 12 , ⁇ 23 , ⁇ 34 vary.
  • FIG. 7 shows a further grinding wheel 50 including the cup-shaped basic body 11 and a plurality of grinding segments 52 according to the present invention, the grinding segments 52 being connected via a backside 54 to the basic body 11.
  • FIG. 7 shows the grinding wheel 50 in a view on a front side 55 of the grinding segments 52.
  • the grinding wheel 50 differs from the grinding wheel 10 in the cross-section of the grinding segments 52 and in the predetermined particle design.
  • FIGS. 8A , B show a first variant of a grinding segment ( FIG. 8A ) 62-1 and a second variant of a grinding segment 62-2 ( FIG. 8B ) for the further grinding wheel 50 of FIG. 7 .
  • the grinding segments 62-1, 62-2 may substitute the grinding segment 12 of the grinding wheel 10 or the grinding segment 52 of the grinding wheel 50.
  • the grinding segments 62-1, 62-2 may be connected via a back side 64-1, 64-2 to the connection face 17 of the basic body 11 and grinding with the grinding wheel 50 may be performed via a front side 65-1, 65-2 of the grinding segments 62-1, 62-2, the front side 64-1, 64-2 being opposite of the back side 64-1, 64-2.
  • the grinding segments 62-1, 62-2 are fabricated via powder metallurgy, in which a green body is build up layer by layer from a powdery or granular bond material and a plurality of superabrasive particles and the green body is further processed to form the grinding segments 62-1, 62-2 by free-form sintering, by hot-pressing, and/or by infiltrating.
  • the grinding segment 62-1 differs from the grinding segment 62-2 in the back side.
  • FIGS. 9A , B show the grinding segments 62-1, 62-2 of FIGS. 8A , B, which are composed of a bond material 66 that is free-form sintered or hot-pressed and of superabrasive particles 67 being arranged according to a first predetermined particle design ( FIG. 9A ) or a second predetermined particle design ( FIG. 9B ).
  • the superabrasive particles 67 are arranged in four groups G 1 , G 2 , G 3 , G 3 of lines.
  • Each group G 1 , G 2 , G 3 , G 4 includes a first line l 1 of superabrasive particles 67 arranged on a first height level, a second line l 2 of superabrasive particles 67 arranged on a second height level, a third line l 3 of superabrasive particles 67 arranged on a third height level, and a fourth line l 4 of superabrasive particles 67 arranged on a fourth height level, wherein the four lines l 1 , l 2 , l 3 , l 4 of each group are arranged on different height levels in the height direction.
  • the number of superabrasive particles 67 in a line can vary and may depend on the cross-section of the grinding segment.
  • the first line l 1 comprises one superabrasive particle 67 in the first group G 1 , five superabrasive particles 67 in the second group G 2 , seven superabrasive particles 67 in the third group G 3 , and three superabrasive particles 67 in the fourth group G 4 , and, in the second predetermined particle design shown in FIG.
  • the first line l 1 comprises one superabrasive particle 67 in the first group G 1 , seven superabrasive particles 67 in the second group G 2 , ten superabrasive particles 67 in the third group G 3 , and five superabrasive particles 67 in the fourth group G 4 .
  • FIGS. 10A , B show a cross-section of further grinding segments 72-1, 72-2 in a plane parallel to a height direction H of the grinding segments 72-1, 72-2, the grinding segment 72-1 including a non-structured first lower surface ( FIG. 10A ) and the grinding segment 72-2 including a structured first lower surface ( FIG. 10B ).
  • the grinding segments 72-1, 72-2 may substitute the grinding segment 12 of the grinding wheel 10 or the grinding segment 52 of the grinding wheel 50.
  • the grinding segments 72-1, 72-2 are both made of a bond material 73 that is at least one of free-form sintered and hot-pressed and of superabrasive particles 74 being arranged according to a predetermined particle design.
  • the four layers of the bond material 73 are called first layer L 1 , second layer L 2 , third layer L 3 , and fourth layer L 4 , and the four pattern of the superabrasive particles 74 are called first pattern P 1 , second pattern P 2 , third pattern P 3 , and fourth pattern P 4 .
  • the first layer L 1 has a lower surface that is called first lower surface LS 1 and an upper surface that is called first upper surface US 1
  • the second layer L 2 has a lower surface that is called second lower surface LS 2 and an upper surface that is called second upper surface US 2
  • the third layer L 3 has a lower surface that is called third lower surface LS 3 and an upper surface that is called third upper surface US 3
  • the fourth layer L 4 has a lower surface that is called fourth lower surface LS 4 and an upper surface that is called fourth upper surface US 4 .
  • Both grinding segments 72-1, 72-2 have structured second, third, and fourth lower surfaces LS 2 , LS 3 , LS 4 and structured first, second, third, and fourth upper surfaces US 1 , US 2 , US 3 , US 4 , wherein the structured lower surfaces LS 2 , LS 3 , LS 4 and structured upper surfaces US 1 , US 2 , US 3 , US 4 have a first structure that corresponds to the predetermined particle design.
  • the grinding segments 72-1, 72-2 differ in the first lower surface LS 1 . Whereas the grinding segment 72-1 ( FIG. 10A ) has a non-structured first lower surface LS 1 , the grinding segment 72-2 ( FIG. 10B ) has a structured first lower surface LS 1 .
  • the structured lower surfaces and structured upper surfaces having the first structure are created by compacting the green body via the structured upper punch (see FIG. 4 ).
  • the first lower surface LS 1 is created by compacting the green body via the lower upper punch (see FIG. 4 ), the lower punch may be non-structured to generate the grinding segment 72-1 of FIG. 10A or may have a second structure to generate the grinding segment 72-2 of FIG. 10B .
  • Each group G 1 , G 2 , G 3 includes a first line l 1 of superabrasive particles 74 arranged on a first height level h 1 , a second line l 2 of superabrasive particles 74 arranged on a second height level h 2 , a third line l 3 of superabrasive particles 74 arranged on a third height level h 3 , and a fourth line l 4 of superabrasive particles 74 arranged on a fourth height level h 4 .
  • the grinding segments 72-1, 72-2 may be connected via a back side 75-1, 75-2 to a connection face of a basic body and grinding may be performed via a front side 76-1, 76-2 of the grinding segments 72-1, 72-2, the front side 76-1, 76-2 being opposite of the back side 75-1, 75-2.
  • the back sides 75-1, 75-2 of the grinding segments 72-1, 72-2 are defined by the fourth upper surface US 4
  • the front sides 76-1, 76-2 of the grinding segments 72-1, 72-2 are defined by the first lower surface LS 1 .
  • the grinding segment 72-2 may have the advantage that the surface area of the front side 76-1 is reduced compared to the grinding segment 72-1.
  • the structure of the first lower surface LS 1 has no impact on the distribution of the superabrasive particles 74.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP22198652.4A 2022-09-29 2022-09-29 Segment de meulage et disque à disque avec segments de meulage Withdrawn EP4344823A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP22198652.4A EP4344823A1 (fr) 2022-09-29 2022-09-29 Segment de meulage et disque à disque avec segments de meulage
PCT/EP2023/076921 WO2024068854A1 (fr) 2022-09-29 2023-09-28 Segment de meulage et meule boisseau à segments de meulage
EP23782520.3A EP4594051A1 (fr) 2022-09-29 2023-09-28 Segment de meulage et meule boisseau à segments de meulage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22198652.4A EP4344823A1 (fr) 2022-09-29 2022-09-29 Segment de meulage et disque à disque avec segments de meulage

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EP4344823A1 true EP4344823A1 (fr) 2024-04-03

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EP22198652.4A Withdrawn EP4344823A1 (fr) 2022-09-29 2022-09-29 Segment de meulage et disque à disque avec segments de meulage
EP23782520.3A Pending EP4594051A1 (fr) 2022-09-29 2023-09-28 Segment de meulage et meule boisseau à segments de meulage

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002066217A1 (fr) * 2001-02-20 2002-08-29 Ehwa Diamond Ind. Co., Ltd. Plaquettes d'usinage et molette de decoupe, meule et molette de perçage equipees de telles plaquettes
US20030084894A1 (en) * 1997-04-04 2003-05-08 Chien-Min Sung Brazed diamond tools and methods for making the same
WO2006110010A1 (fr) * 2005-04-14 2006-10-19 Ehwa Diamond Industrial Co., Ltd. Segment de coupe, procede de fabrication de segment de coupe, et outil de coupe comprenant ce segment
KR20070077533A (ko) * 2006-01-24 2007-07-27 이창현 초연마재 프리폼을 이용한 가공팁 및 그 제조방법
US20150290771A1 (en) * 2012-03-27 2015-10-15 Yundong Li Abrasive article and method for making the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030084894A1 (en) * 1997-04-04 2003-05-08 Chien-Min Sung Brazed diamond tools and methods for making the same
WO2002066217A1 (fr) * 2001-02-20 2002-08-29 Ehwa Diamond Ind. Co., Ltd. Plaquettes d'usinage et molette de decoupe, meule et molette de perçage equipees de telles plaquettes
WO2006110010A1 (fr) * 2005-04-14 2006-10-19 Ehwa Diamond Industrial Co., Ltd. Segment de coupe, procede de fabrication de segment de coupe, et outil de coupe comprenant ce segment
KR20070077533A (ko) * 2006-01-24 2007-07-27 이창현 초연마재 프리폼을 이용한 가공팁 및 그 제조방법
US20150290771A1 (en) * 2012-03-27 2015-10-15 Yundong Li Abrasive article and method for making the same

Also Published As

Publication number Publication date
EP4594051A1 (fr) 2025-08-06
WO2024068854A8 (fr) 2024-11-07
WO2024068854A1 (fr) 2024-04-04

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