EP4171878A1 - Procédé de production d'un corps cru et procédé de traitement ultérieur du corps cru pour former un segment d'usinage - Google Patents

Procédé de production d'un corps cru et procédé de traitement ultérieur du corps cru pour former un segment d'usinage

Info

Publication number
EP4171878A1
EP4171878A1 EP21732008.4A EP21732008A EP4171878A1 EP 4171878 A1 EP4171878 A1 EP 4171878A1 EP 21732008 A EP21732008 A EP 21732008A EP 4171878 A1 EP4171878 A1 EP 4171878A1
Authority
EP
European Patent Office
Prior art keywords
processing
green compact
machining
segment
matrix material
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.)
Pending
Application number
EP21732008.4A
Other languages
German (de)
English (en)
Inventor
Thorsten Klein
Matthaeus Hoop
Thomas Britt
Jens Stracke
Steven Moseley
József SZABÓ
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
Publication of EP4171878A1 publication Critical patent/EP4171878A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
    • 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
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B24D5/063—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with segments embedded in a matrix which is rubbed away during the grinding process
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/005—Article surface comprising protrusions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D2203/00—Tool surfaces formed with a pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • B24D99/005—Segments of abrasive wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone

Definitions

  • the present invention relates to a method for producing a green compact according to the preamble of claim 1 and a method for further processing a green compact into a processing segment according to the preamble of claim 4.
  • Machining tools such as core drill bits, saw blades, abrasive disks and abrasive cutting chains, include machining segments that are attached to a tubular, disc or ring-shaped base body, the machining segments being connected to the base body by welding, soldering or gluing.
  • processing segments that are used for core drilling are used as drilling segments
  • processing segments that are used for sawing are used as saw segments
  • processing segments that are used for cut-off grinding as cutting-off segments designated.
  • Machining segments for core drill bits, saw blades, abrasive disks and abrasive cutting chains are made from a matrix material and hard material particles, whereby the hard material particles can be statistically distributed or are arranged according to a defined particle pattern in the matrix material.
  • the matrix material and the hard material particles are mixed, the mixture is poured into a suitable tool mold and further processed to form the machining segment.
  • a green compact is built up in layers from matrix material, in which the hard material particles are arranged according to the defined particle pattern.
  • processing zone turns off a first matrix material and the neutral zone of a second matrix material, which is different from the first matrix material and is weldable to the base body, builds up.
  • Processing tools that can be designed as a core drill bit, saw blade, abrasive disc or abrasive cutting chain and are vorgese hen for wet processing of concrete materials are only conditionally suitable for dry processing of concrete materials.
  • an abrasive concrete slurry is created, which supports the processing process and leads to a self-sharpening of the processing segments during processing.
  • the matrix material is removed by the abrasive concrete slurry and new hard material particles are exposed.
  • no abrasive concrete sludge can form, which can support the processing process.
  • the hard material particles quickly become blunt and the processing rate drops. Due to the lack of concrete sludge, the matrix material wears out too slowly and hard material particles lying deeper cannot be exposed.
  • European patent application EP 3 670 041 relates to a method for producing a machining segment from a first matrix material and first hard material particles which are arranged according to a defined first particle pattern. The method is characterized in that a green compact is produced in which the first hard material particles protrude from the first matrix material on the upper side. The green compact is further processed with a special press die, which has depressions in a pressing surface, the arrangement of the depressions corresponding to the defined first particle pattern of the first hard material particles.
  • the known method for producing a processing segment has the disadvantage that a special press die with depressions in the pressing surface is required for further processing the green compact to form the processing segment, which is used for compression or hot pressing.
  • a special press die is required for each defined first particle pattern according to which the first hard material particles are arranged.
  • the object of the present invention is to develop a method for producing a green compact for a machining segment, with which machining segments can be made that have a protrusion of the hard material particles on the upper side.
  • Conventional tool components should be used both in the production of the green compact and in the further processing of the green compact in the machining segment; the use of special tool components should be avoided.
  • the method according to the invention for producing a green compact is characterized in that the green compacts are built up vertically, i.e. the direction of build runs perpendicular to the vertical direction between the bottom and top of the processing segment.
  • the protrusion of the first hard material particles on the upper side of the processing segments is generated with the aid of the powder or granular support material, the support material being different from the first matrix material.
  • support material summarizes all materials for the construction of processing segments into which hard material particles can be embedded.
  • the support material is designed in powder or granular form and is different from the first matrix material; it serves to completely embed the hard material particles in powder or granular material.
  • Green compacts which are produced by means of the method according to the invention for producing a green compact, can be further processed into processing segments by means of known methods for further processing the green compact.
  • known methods for Further processing includes compacting the green compact by cold pressing or hot pressing to form a compact, which is further processed into the processing segment by free-form sintering or hot pressing, or the further processing of the green compact by free-form sintering or hot pressing to form the processing segment.
  • Green compacts are further processed under the influence of temperature by free-form sintering or hot pressing to form the finished processing segment, the sintering temperature of the first matrix material determining the temperature up to which the green compacts or compacts must be heated.
  • the support material can retain its powdery or granular state during the further processing of the green compact into the processing segment (first variant) or support the sintering process as an infiltrate (second variant).
  • a support material is applied with a melting temperature that is higher than the sintering temperature of the first matrix material. If the melting temperature of the support material is higher than the sintering temperature of the first matrix material, the support material remains in its powdery or granular state when it is heated and can be easily removed from the finished processing segment after the sintering process.
  • a support material is applied with a melting temperature that is lower than the sintering temperature of the first matrix material. If the melting temperature of the support material is lower than the sintering temperature of the first matrix material, the support material changes its powdery or granular state when it is heated and liquefies before the first matrix material sintered.
  • the liquid support material can be distributed in the first matrix material and support the sintering process as an infiltrate.
  • the invention further relates to a method for further processing a green compact, which was produced using the method for producing a green compact, into a processing segment, which is connected with an underside to a base body of a processing tool.
  • the first hard material particles have a protrusion on the top compared to the first matrix material.
  • the green compact is compressed into a compact under the action of pressure, and the compact is then further processed into the processing segment.
  • the green compact is compressed into a compact under the action of pressure between a first press die, which forms the underside of the processing segment, and a second press die, which forms the upper side of the processing segment.
  • the compact is processed further by free-form sintering or hot pressing to form the processing segment. Since the first hard material particles were completely embedded in the powder or granular support material in a green compact produced according to the invention, a conventional second ram can be used during hot pressing to shape the top of the processing segment.
  • the green compact is further processed into a processing segment by free-form sintering or hot pressing. Since the first hard material particles in a green compact produced according to the invention were completely embedded in powder or granular support material, a conventional second ram can be used during hot pressing to shape the top of the processing segment.
  • FIGN. 1A, B two variants of a machining tool designed as a core drill bit
  • FIGN. 2A, B two variants of a machining tool designed as a saw blade;
  • FIG. 3 a machining tool designed as a removal disk;
  • FIG. 4 a machining tool designed as an abrasive cutting chain;
  • FIGN. 5A-C a green compact (FIG. 5A) which is compacted to form a compact (FIG. 5B) and further processed to form a processing segment (FIG. 5C);
  • FIGN. 6A-D show the production of the green body of FIG. 5A with the aid of the method according to the invention for producing a green compact;
  • FIGN. 7A, B a green compact (FIG. 7A), which is further processed into a processing segment (FIG. 7B).
  • FIGN. 1A, B show two variants of a processing tool designed as a core drill bit 10A, 10B.
  • the in FIG. 1A shown core drill bit 10A is hereinafter referred to as the first core drill bit and the one shown in FIG. 1B shown core drill bit 10B is referred to as a second core drill bit, in addition, the first and second core drill bit 10A, 10B are summarized under the term "core drill bit”.
  • the first core drill bit 10A comprises several machining segments 11A, a tubular base body 12A and a tool holder 13A.
  • the machining segments 11A which are used for core drilling, are also referred to as drilling segments and the tubular base body 12A is also referred to as a drill shank.
  • the drill segments 11A are firmly connected to the drill shaft 12A, for example by screwing, gluing, soldering or welding.
  • the second core drill bit 10B comprises an annular machining segment 11B, a tubular base body 12B and a tool holder 13B.
  • the ringför shaped machining segment 11 B which is used for core drilling, is also referred to as a drilling ring and the tubular base body 12B is also referred to as a drill shank.
  • the drill ring 11B is firmly connected to the drill shank 12B, for example by screwing, gluing, soldering or welding.
  • the core drill bit 10A, 10B is connected to a core drilling device via the tool holder 13A, 13B and is driven by the core drilling device in a direction of rotation 14 about an axis of rotation 15 during drilling operation.
  • the core drill bit 10A, 10B is moved along a feed direction 16 into a workpiece to be machined, the feed direction 16 running parallel to the axis of rotation 15.
  • the core drill bit 10A, 10B generates a drill core and a borehole in the workpiece to be machined.
  • the drill shank 12A, 12B is in the embodiment of FIGN. 1A, B formed in one piece and the drill segments 11A and the drill ring 11B are firmly connected to the drill shank 12A, 12B.
  • the drill shaft 12A, 12B can be formed in two parts from a first drill shaft section and a second drill shaft section, with the drill segments 11A or the drill ring 11B firmly connected to the first drill shaft section and the tool holder 13A, 13B firmly connected to the second drill shaft section.
  • the first and second drill shaft sections are connected to one another via a releasable connecting device.
  • the releasable connecting device is designed, for example, as a plug-in-turn connection, as described in EP 2 745 965 A1 or EP 2 745966 A1.
  • the design of the drill shaft as a one-piece or two-piece drill shaft has no influence on the structure of the drill segments 11A or the drill ring 11 B.
  • FIGN. 2A, B show two variants of a machining tool designed as a saw blade 20A, 20B.
  • the in FIG. The saw blade 20A shown in FIG. 2A is subsequently used as the first saw blade and the saw blade 20A shown in FIG.
  • the saw blade 20B shown in FIG. 2B is referred to as the second saw blade, and the first and second saw blades 20A, 20B are grouped together under the term "saw blade".
  • the first saw blade 20A comprises several processing segments 21A, a disk-shaped base body 22A and a tool holder.
  • the machining segments 21A which are used for sawing, are also referred to as saw segments, and the disk-shaped base body 22A is also referred to as the main blade.
  • the saw segments 21A are firmly connected to the master blade 22A, for example by screwing, gluing, soldering or welding.
  • the second saw blade 20B comprises a plurality of machining segments 21B, an annular base body 22B and a tool holder.
  • the processing segments 21B that are used for sawing are also referred to as sawing segments and the ring-shaped base body 22B is also referred to as a ring.
  • the saw segments 21B are firmly connected to the ring 22B, for example by screwing, gluing, soldering or welding.
  • the saw blade 20A, 20B is connected to a saw via the tool holder and, when the saw is in operation, is driven by the saw in a direction of rotation 24 about an axis of rotation 25. During the rotation of the saw blade 20A, 20B about the axis of rotation 25, the saw blade 20A, 20B is moved along a feed direction, the feed direction running parallel to the longitudinal plane of the saw blade 20A, 20B. The saw blade 20A, 20B creates a saw slot in the workpiece to be machined.
  • FIG. 3 shows a machining tool designed as a removal disk 30.
  • the removal disk 30 comprises several machining segments 31, a base body 32 and a tool holder.
  • the processing segments 31, which are used for the removal, are also referred to as removal segments and the disk-shaped base body 32 is also referred to as a pot.
  • the removal segments 31 are firmly connected to the pot 32, for example by screwing, gluing, soldering or welding.
  • the removal disk 30 is connected to a tool device via the tool holder and is driven by the tool device in a direction of rotation 34 about an axis of rotation 35 in the removal mode.
  • the removal disk 30 During the rotation of the removal disk 30 about the axis of rotation 35, the removal disk 30 is moved over a workpiece to be machined, the movement of the being perpendicular to the axis of rotation 35. The removal disk 30 removes the surface of the workpiece to be machined.
  • FIG. 4 shows a machining tool designed as an abrasive cutting chain 40.
  • the abrasive cutting chain 40 comprises several processing segments 41, several link-shaped base bodies 42 and several connecting links 43.
  • the processing segments 41 which are used for cut-off grinding, are also referred to as cut-off segments and the link-shaped base bodies 42 are also referred to as drive links.
  • the drive links 42 are connected via the connecting links 43.
  • the connecting links 43 are connected to the drive links 42 via rivet bolts.
  • the rivet bolts allow rotation of the drive links 42 relative to the connecting members 43 about an axis of rotation which runs through the center of the rivet bolts.
  • the processing segments 41 are firmly connected to the drive links 42, for example by screwing, gluing, soldering or welding.
  • the abrasive cutting chain 40 is connected to a tool device via a tool holder and is driven in one direction of rotation by the tool device during operation. During the rotation of the abrasive cutting chain 40, the abrasive cutting chain 40 is moved into a workpiece to be machined.
  • a processing segment 51 which has hard material particles protruding from the matrix material on its upper side, takes place with the aid of the method according to the invention for producing a green compact and the method for further processing the green compact into a processing segment.
  • a green compact 52 is produced, in a second stage the green compact 52 is compacted into a compact 53 and in a third stage the compact 53 is processed further to form the processing segment 51.
  • a green compact can be produced in a first stage, which is further processed into a processing segment in a second stage.
  • FIGN. 5A-C show the green compact 52 (FIG. 5A), the compact 53 (FIG. 5B) and the processing segment 51 (FIG. 5C).
  • the machining segment 51 is made up of a machining zone 54 and a neutral zone 55.
  • the neutral zone 55 is required if the machining processing segment 51 welded to the base body of a processing tool who should and the combination of matrix material and base body cannot be welded; In the case of weldable combinations of matrix material and base body, the neutral zone 55 can be omitted.
  • the processing zone 54 is made up of a powdery or granular first matrix material 56 and first hard material particles 57, which are arranged according to a defined first particle pattern, and the neutral zone 55 is made up of a powdery or granular second matrix material 59.
  • matrix material summarizes all materials for the construction of machining segments into which hard material particles can be embedded. Matrix materials can consist of one material or be composed as a mixture of different materials.
  • hard material particles summarizes all cutting means for machining segments; These include, above all, individual hard material particles, composite parts made up of several hard material particles, and coated or encapsulated hard material particles.
  • the processing segment 51 corresponds to the structure and composition of the processing segments 11 A, 21 A, 21 B, 31, 41; the machining segment 11 B designed as a drill ring differs from the machining segment 51 by its ring-shaped structure.
  • the machining segments can differ from one another in terms of the dimensions and the curvatures of the surfaces. The structure of the machining segments is explained using the machining segment 51 and applies to the machining segments 11A, 21A, 21B, 31, 41.
  • the machining segment 51 comprises the first hard material particles 57, which are arranged in the first matrix material 56.
  • the "first hard material particles” are the hard material particles of the processing segment 51 that process a subsurface, the number of first hard material particles 57 and the defined first particle pattern according to which the first hard material particles 57 are arranged in the first matrix material 56 on the requirements of the processing segment 51 be adjusted.
  • the first hard material particles 57 generally originate from a particle distribution which is characterized by a minimum diameter, a maximum diameter and an average diameter.
  • the processing segment 51 is connected to the base body of the processing tool with an underside 61.
  • the underside of the machining segments is usually flat, whereas the underside of machining segments for sawing has a curvature so that the machining segments can be attached to the curved face of the ring-shaped or disk-shaped base body.
  • the first hard material particles 57 have a protrusion D with respect to the first matrix material 56 on an upper side 62 opposite the lower side 61.
  • the green compact 52 is built up in the standing structure from the first matrix material 56, the first hard material particles 57, the second matrix material 59 and a powdery support material 63.
  • the support material 63 is different from the first matrix material 56 and serves to protect the first hard material particles 57 on the upper side 62.
  • the green compact 52 is under the action of pressure between a first press ram 64, which forms the bottom 61, and a second press ram 65, which forms the top 62, ver seals.
  • the pressing direction of the first press ram 64 and second press ram 65 runs parallel to the direction of construction of the green compact 52.
  • Cold pressing processes or hot pressing processes, for example, are suitable as processes which achieve a pressure effect on the green compact 52.
  • the green compact 52 is exposed exclusively to the action of pressure, while in the case of hot pressing processes, in addition to the action of pressure, the green compact 52 is exposed to a temperature of up to temperatures of approx. 200 ° C.
  • the compact 53 is processed further to form the processing segment 51 by free-form sintering or hot pressing.
  • free-form sintering there is a temperature effect on the compact 53 and in the case of hot pressing there is an effect of pressure and temperature.
  • hot pressing there is an effect of pressure and temperature.
  • the properties of the support material 63 determine the behavior of the support material 63 during further processing. If the melting temperature Ts chmeiz of the support material 63 is lower than the sintering temperature Tsi nter of the first matrix material 76, the support material 63 changes its powdery or granular state when heated and liquefies before the first matrix material 56 sintered; the liquid support material 63 can distribute itself in the first matrix material 76 during the sintering process and support the sintering process as an infiltrate.
  • FIGN. 6A-D show the production of the green compact 52 using the method according to the invention for producing a green compact.
  • the green compact 52 is made up of the first matrix material 56, the first hard material particles 57, the second matrix material 59 and the support material 63.
  • the green body 52 is produced in several steps: In a first step, a support layer 66 of the support material 63 is applied (FIG. 6A), wherein the support material 63 can be applied in one layer or in several layers. In a second step, the first hard material particles 57 are arranged in the support material 63 according to the defined first particle pattern (FIG. 6B), the first hard material particles 57 not being completely embedded in the support material 63, but rather protruding from the support material 63. In a third step, a first matrix layer 67 of the first matrix material 56 is applied to the support material 63 and the first hard material particles 57 (FIG. 6C), wherein the first matrix material 56 can be applied in one layer or in several layers.
  • a second matrix layer 68 of the second matrix material 59 is applied to the first matrix material 56 and the first hard material particles 57 (FIG. 6D), wherein the second matrix material 59 can be applied in one layer or in several layers.
  • the application of the second matrix material 59 can be dispensed with.
  • FIGN. 7A, B show a further processing segment 71 which was produced using the method according to the invention for producing a green compact and the method for further processing the green compact into the processing segment.
  • the machining segment 71 is manufactured in two stages: In a first stage a green compact 72 is manufactured (FIG. 7A) and in a second stage the green compact 72 is further processed to form the machining segment 71 (FIG. 7B).
  • the machining segment 71 differs from the machining segment 51 of FIG. 5C in that the machining segment 71 is made up of a machining zone 74 and has no neutral zone.
  • the processing zone 74 is made up of a powdery or granular first matrix material 76, first hard material particles 77, which are arranged according to a defined first particle pattern, and second hard material particles 78.
  • the second hard material particles 78 were arranged in the first matrix material 76 according to the defined second particle pattern.
  • the second hard material particles 78 can be added to the first matrix material 76 as randomly distributed particles.
  • the first hard material particles 77 and second hard material particles 78 generally originate from particle distributions which are characterized by a minimum diameter, a maximum diameter and an average diameter.
  • the first hard material particles 77 come from a first particle distribution with a first mean diameter and the second hard material particles 78 from a second particle distribution with a second mean diameter, the first mean diameter being greater than the second mean diameter.
  • the first hard material particles 77 and second hard material particles 78 can originate from the same particle distribution and have the same mean diameter.
  • the processing segment 71 is connected to the base body of a processing tool with an underside 81.
  • the processing of a subsurface is carried out by first hard material particles 77 which are arranged on an upper side 82 opposite the underside 81.
  • the green compact 71 shown in FIG. 7A is built up upright from the first matrix material 76, the first hard material particles 77, the second hard material particles 83 and a powder or granulate support material 83.
  • the support material 83 is different from the first matrix material 76 and serves to cover the first hard material particles 77 on the upper side 82.
  • the state of the support material 83 is adapted to the state of the first matrix material 76, i.e. a powdery support material 83 is used for a powdery first matrix material 76 and a granular support material 83 for a granular first matrix material 76.
  • the green compact 72 is produced in several steps: In a first step, the support material 83 is applied (FIG. 6A), it being possible for the support material 83 to be applied in one layer or in several layers. In a second step, the first hard material particles 77 are arranged in the support material 83 according to the defined first particle pattern (FIG. 6B), the first hard material particles 77 not being completely embedded in the support material 83, but rather a protrusion over the support material 83.
  • the production of the green compact 72 ends with a sequence of a third and fourth step, the sequence being carried out once or several times; in the case of the green compact 72 of FIG. 7A, the sequence of the third and fourth steps is carried out in triplicate.
  • the third step is the first matrix material 76 is applied and, in the fourth step, the second hard material particles 78 are arranged in the first matrix material 76 according to the defined second particle pattern.
  • the green compact 72 is processed further to form the processing segment 71 by free-form sintering or hot pressing. During free-form sintering there is a temperature effect and during hot pressing there is a pressure and temperature effect on the green compact 71.
  • the properties of the support material 83, in particular the melting temperature Ts chmeiz, determine the behavior of the support material 83 during further processing.
  • the support material 83 changes its powdery or granular state when heated and liquefies before the first matrix material 76 sintered; the liquid support material 83 can be distributed in the first matrix material 76 during the sintering process and support the sintering process as an infiltrate. If the melting temperature Ts chmeiz of the support material 83 is higher than the sintering temperature Tsmter of the first matrix material 76, the support material 83 remains in its powdery or granular state during heating and can easily be removed from the finished processing segment after the sintering process.

Abstract

L'invention concerne un procédé de production d'un corps cru pour un segment d'usinage (51) à partir d'un premier matériau de matrice pulvérulent ou granulaire (56) et de premières particules de matériau dur (57), une face inférieure (61) du segment d'usinage étant reliée à un corps cru d'un outil d'usinage. Le segment d'usinage (51), sur une face supérieure (62) opposée à la face inférieure (61), présente une partie saillante (Δ) des premières particules de matériau dur (57).
EP21732008.4A 2020-06-24 2021-06-10 Procédé de production d'un corps cru et procédé de traitement ultérieur du corps cru pour former un segment d'usinage Pending EP4171878A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20181949.7A EP3928905A1 (fr) 2020-06-24 2020-06-24 Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement
PCT/EP2021/065614 WO2021259652A1 (fr) 2020-06-24 2021-06-10 Procédé de production d'un corps cru et procédé de traitement ultérieur du corps cru pour former un segment d'usinage

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EP4171878A1 true EP4171878A1 (fr) 2023-05-03

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EP20181949.7A Withdrawn EP3928905A1 (fr) 2020-06-24 2020-06-24 Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement
EP21732008.4A Pending EP4171878A1 (fr) 2020-06-24 2021-06-10 Procédé de production d'un corps cru et procédé de traitement ultérieur du corps cru pour former un segment d'usinage

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EP20181949.7A Withdrawn EP3928905A1 (fr) 2020-06-24 2020-06-24 Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement

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US (1) US20230294244A1 (fr)
EP (2) EP3928905A1 (fr)
WO (1) WO2021259652A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2143636A (en) * 1935-12-04 1939-01-10 Carborundum Co Abrasive wheel and its manufacture
US5203880B1 (en) * 1992-07-24 1995-10-17 Ultimate Abrasive Syst Inc Method and apparatus for making abrasive tools
ZA9410384B (en) * 1994-04-08 1996-02-01 Ultimate Abrasive Syst Inc Method for making powder preform and abrasive articles made therefrom
EP2745966A1 (fr) 2012-12-21 2014-06-25 HILTI Aktiengesellschaft Trépan doté d'une section de coupe interchangeable
EP2745965A1 (fr) 2012-12-21 2014-06-25 HILTI Aktiengesellschaft Trépan doté d'une section de coupe interchangeable
EP3670041A1 (fr) 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Procédé de fabrication d'un segment de traitement pour le traitement à sec de matériaux de béton

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WO2021259652A1 (fr) 2021-12-30
US20230294244A1 (en) 2023-09-21

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