EP3698901B1 - Outil de compression - Google Patents

Outil de compression Download PDF

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Publication number
EP3698901B1
EP3698901B1 EP19157928.3A EP19157928A EP3698901B1 EP 3698901 B1 EP3698901 B1 EP 3698901B1 EP 19157928 A EP19157928 A EP 19157928A EP 3698901 B1 EP3698901 B1 EP 3698901B1
Authority
EP
European Patent Office
Prior art keywords
die
leg
die member
corner
press tool
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
Application number
EP19157928.3A
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German (de)
English (en)
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EP3698901A1 (fr
Inventor
Dirk Sterkenburg
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.)
Seco Tools AB
Original Assignee
Seco Tools AB
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 Seco Tools AB filed Critical Seco Tools AB
Priority to EP19157928.3A priority Critical patent/EP3698901B1/fr
Priority to JP2020021988A priority patent/JP7478545B2/ja
Publication of EP3698901A1 publication Critical patent/EP3698901A1/fr
Application granted granted Critical
Publication of EP3698901B1 publication Critical patent/EP3698901B1/fr
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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
    • B22F3/03—Press-moulding apparatus therefor
    • 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
    • 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
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/007—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a plurality of pressing members working in different directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • 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
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/031—Press-moulding apparatus therefor with punches moving in different directions in different planes

Definitions

  • the present disclosure relates to a press tool for manufacturing a cutting insert green body.
  • Cutting inserts are metal cutting tools for machining of metal by milling, drilling or turning or by similar chip forming methods.
  • Cutting inserts are produced by powder metallurgical methods from a metallic composite powder, for example, a cemented carbide powder, or from a ceramic powder, such as a mixture comprising aluminium oxide and silicon nitride.
  • a cemented carbide is a metallic composite having metal carbides, for example, tungsten carbide, titanium carbide or tantalum carbide in a metallic binder of, for example, cobalt, nickel or iron.
  • Cutting inserts may also be manufactured from cermets, for example, from a mixture comprising titanium carbide and nickel, or other materials such as, for example, cBN materials.
  • the powder may be compacted into a cutting insert green body by opposing first and second punches in a die cavity. After compaction, the cutting insert green body is removed from the die cavity and sintered into a solid cutting insert blank.
  • the die used for housing the powder in connection to the compaction may be a so called split die press tool, comprising a first and a second die half that are movable from each other for the purpose of allowing removal of a geometrically complicated green body from the die after compaction thereof.
  • the die halves may be of different shape.
  • each die half comprises a body having a u-shaped recess at an end thereof. Two sides of the U-shaped recess may be regarded as defined by two rectangular parallelepiped shaped legs extending from the rest of the body of the die half.
  • each die half comprises a body having a v-shaped recess at an end thereof.
  • the two sides of the v-shaped recess may be regarded as defined by two wedge shaped legs extending from the rest of the body of the die half.
  • two die-halves are positioned with their respective v-shaped recess directed towards each other, such that a die cavity is defined by the opposing recesses.
  • a lower punch or die element is arranged at the bottom of the die cavity, powder is introduced into the die cavity, and an upper punch, introduced from above into said die cavity, is used for compacting the powder, in combination with a corresponding introduction from below of the lower punch into the die cavity.
  • the powder will exert an outwardly directed pressure on the legs of the respective die half striving to bend the legs in an outward direction.
  • die halves made of cemented carbide of grades having the requested wear resistance for the application in question may obtain cracks in a corner region of the die member where two die surfaces meet each other after repeated compaction sequences, due to the legs being bend in an outward direction during each compaction sequence.
  • cracks are formed in the corner region before the inner surfaces of the legs are worn to a non-acceptable standard due to the abrasion caused by the powder.
  • crack initiation and propagation in the corner region of the respective die half becomes the critical factor for the functionality of the press tool.
  • a press tool for manufacturing a cutting insert green body comprising:
  • the diverse die material properties may be achieved by means of a method in which different parts made of sintered cemented carbide of different microstructure and/or composition are sintered together into a single body, followed by forming of a recess by means of electro discharge machining, such that a die having the geometry and cavity as defined above is formed.
  • the cemented carbide having the lower toughness has higher wear resistance than the tougher portion.
  • the first and second surfaces of the first and second legs are formed by the cemented carbide having the lower toughness and the higher wear resistance.
  • said corner has an angle ⁇ of less than 100o.
  • said corner has an angle ⁇ of less than 70o.
  • the corner in said corner region has a corner curvature corresponding to a radius of less than 1.65 mm, preferably less than 1.1 mm.
  • said portion extends at least 0.1 mm, preferably at least 0.25 mm, most preferably at least 1 mm measured along the first and second die surfaces in a direction from a tip of the corner towards the free ends of the first leg and the second leg. Accordingly, said portion defines a part of the first and second surfaces which extends at least 0.1 mm, preferably at least 0.25 mm, most preferably at least 1 mm, from the tip of the corner.
  • the minimum extension depends, for example, on the manufacturing method of the portion and the stress conditions in the corner region.
  • said portion extends not more than half of the length of the die surfaces measured along the first and second die surfaces in a direction from a tip of the corner towards the free ends of the first leg and the second leg. Accordingly, said portion defines a part of the first and second surfaces which extends not more than half of the length of the first and second die surfaces in a direction from the tip of the corner. At such distance from the corner, wear resistance can be prioritized before toughness.
  • said portion has a thickness of at least 0.1 mm, preferably at least 1 mm, in a direction of a normal to the die surface of said portion that delimits the die cavity.
  • said portion has a thickness as seen in the extension of the corner tip.
  • said portion extends from a tip of said corner to an opposite end of the die member in a first direction pointing away from said first and second legs towards said opposite end.
  • Such an embodiment facilitates exact and rapid positioning of a first and a second part that are to be sintered together to form said die member.
  • the die member has a longitudinal direction which is parallel with said first direction, and that the cross-sections of said portion and the die member, as seen cross wise, or perpendicular, to said longitudinal direction of the die member are constant along the length of the die member, a v-shaped recess in the die member that defines said legs, hence the die cavity, can be re-formed deeper and deeper into the original die member as the die cavity-defining surfaces of the latter are worn.
  • said portion extends along said corner from a first end to an opposite second end of said die member.
  • said portion is concentrated to an area of the die member in which a green body of a cutting insert is finally formed during compression by means of at least one punch that is moved into the die cavity.
  • said portion viewed on a plane perpendicularly to a first direction from a tip of the corner towards an opposite end of the die member, said portion has a rectangular cross-section.
  • the first direction may be the longitudinal direction mentioned hereinabove.
  • said portion viewed on a plane perpendicularly to a first direction from the tip of the corner towards an opposite end of the die member, said portion has an oval or circular cross-section.
  • the first direction may be the longitudinal direction mentioned hereinabove.
  • said portion viewed on a plane perpendicularly to a first direction from the tip of the corner towards an opposite end of the die member, in a first direction which is parallel with the said longitudinal direction mentioned hereinabove, said portion has the same cross-section along its whole length from the tip of the corner towards said opposite end of the die member.
  • the first leg has a wedge-shape and the second leg has a wedge-shape, each one with a base connected to a remaining part of the die member and a respective free end at an end of the first and second surface opposite to said corner.
  • the first and second legs are wedge-shaped when regarded in a direction perpendicular to the longitudinal direction of the die member as defined hereinabove and in a direction in which a punch is to be moved into the die cavity in connection to compression of a powder therein.
  • legs may have other shapes than wedge-shapes, such as a parallelepiped shape, and there may be more than one corner and thus more than one corner region.
  • the cemented carbide forming said portion has larger average carbide particle size than the cemented carbide forming the first leg and the second leg.
  • said cemented carbide comprises particles of tungsten carbide in a matrix of a cobalt binder.
  • the cemented carbide comprises particles of tungsten carbide in a matrix of a cobalt binder, and the cemented carbide forming said portion has higher cobalt content than the cemented carbide forming the first leg and the second leg.
  • said press tool comprises a first die member according to the invention as described hereinabove or hereinafter and a corresponding second die member, which first and second die members are configured to be positioned with free ends of their respective first and second legs directed towards each other and thereby defining a die cavity, and at least one punch arranged to be introduced into the die cavity defined by the first die member and the second die member for the purpose of compacting a powder introduced into said die cavity.
  • the object of the present invention is also achieved by means of a method of producing a press tool according as defined hereinabove or hereinafter, comprising the steps of:
  • the method comprises the further step of electro discharge machining the sintered die member to a final shape.
  • a final shape is a shape in which said press tool is characterised in that, in said corner region, there is a portion of the die in which the cemented carbide has higher toughness than the cemented carbide of the first and second leg further away from the corner region in a direction towards a respective opposite free end of the respective leg.
  • Figs. 1 , 10 and 11 show parts of a press tool according to the present invention
  • the press tool is a press tool for manufacturing a cutting insert green body, and in the embodiment shown it comprises two die members 1, 2, each of which is configured to define a part of a die cavity 3.
  • the press tool also comprises two punches 24, 25 (visible in figs. 10 and 11 ) configured to be introduced from below and above into the die cavity 3 for the purpose of compacting a powder introduced into said die cavity into a cutting insert green body.
  • fig. 11 also a fixture 26, in which the die members 1, 2 may be positioned during compaction of a powder therein, is shown.
  • the die member 1 comprises a solid body that has a first leg 4 defining a first die surface 5 and a second leg 6 defining a second die surface 7.
  • the first die surface 5 and the second die surface 7 delimit a die cavity 3 in which a cutting insert body is formed upon compaction of a powder in said die cavity 3.
  • the first die surface 5 and the second die surface 7 extend with an angle ⁇ of not more than 96o in relation to each other in a corner 8 of a corner region of the die member 1 where the first and second surfaces 5, 7 meet each other.
  • the corner 8 in said corner region has a corner curvature corresponding to a radius of less than 1.65 mm.
  • the first leg 4 has a wedge-shape and the second leg 6 has a wedge-shape, each one with a base connected to a remaining part of the die member 1 and a respective free end 10, 11 at an end of the first and second surface opposite to said corner 8 where the first and second surfaces 5, 7 meet each other.
  • the die member 1 consists of cemented carbide, and, in said corner region, there is a portion 9 of the die member 1 in which the cemented carbide has higher toughness than has the cemented carbide of the die member further away from the corner region in a direction towards a respective opposite free end 10, 11 of the first leg 4 and the second leg 6.
  • the material having lower toughness has a higher wear resistance than the material having a higher toughness.
  • the first and second surfaces 5, 7 have a higher wear resistance in other parts thereof than in the corner region, where the portion 9 having higher toughness is located.
  • the difference in toughness between said portion 9 and other parts of the die member is because the composition of the cemented carbide or the microstructure thereof is different between said portion 9 and other parts of the die member 1.
  • said portion 9 may have a higher binder content and/or a larger mean carbide particle size than other parts of the die member 1.
  • the tough portion 9 extends in a direction y from a tip 23 of the corner towards the opposite free ends 10, 11 of the first leg 4 and the second leg 6.
  • the portion 9 extends at least 0.1 mm of the length of the first and second die surfaces 5, 7 in a direction y from a tip 23 of the corner 8 towards the free ends 10, 11 of the first leg 4 and the second leg 6.
  • Said portion 9 extends not more than half of the length of the first and second die surfaces 5, 7 in a direction y from a tip 23 of the corner 8 towards the free ends 10, 11 of the first leg 4 and the second leg 6.
  • the tough portion 9 has a thickness in a direction of a normal to the first and second die surfaces, of at least 0.1 mm, preferably at least 1 mm.
  • the tough portion 9 extends from the tip 23 of the corner 8 to an opposite end 13 of the die member 1, in a first direction x pointing away from said first and second legs towards said opposite end.
  • the direction x is parallel to the longitudinal direction of the die member 1.
  • the tough portion 9 may, however, have a considerably shorter length in said direction x than the length of the die member.
  • the tough portion 9 has the same cross-section along its whole length from the tip of the corner to said opposite end 13 of the die member 1.
  • Such design is not obligatory, but it facilitates production of the die member and it also enables further stepwise machining of the v-shaped recess that defines the first and second legs 4, 6 as the first and second surfaces become worn, while maintaining the cross-section of the tough portion 9 in the corner region.
  • Fig. 3 shows an embodiment in which the cross-section, as viewed on a plane perpendicular to the longitudinal direction x, of the tough portion, is rectangular and the tough portion 9 extends all the way from a first end 14 to a second end 15 in a direction which, in this case, is perpendicular to the previously mentioned longitudinal direction x and a direction in which a punch is to be moved into the die cavity in connection to compression of a powder therein.
  • the tough portion 9 extends in the first direction all the way from the corner 8 to the opposite end 13 of the die member 1.
  • Fig. 4 shows an alternative embodiment in which the tough portion 9' has a circular cross-section when viewed on a plane perpendicular to the longitudinal direction x.
  • the tough portion 9, 9' is positioned in the corner 8 in the die cavity 3 where an cutting insert green body is finally compressed, i.e. the tough portion is positioned in a part of the die cavity 3 where the stress, caused by the compaction pressure onto the first and second surfaces 6, 7, reach very high values.
  • the first leg 4 has an outer surface 16 on an opposite side of the first leg 4 with regard to said first surface 5
  • the second leg 6 has an outer surface 17 on an opposite side of the second leg 6 with regard to said second surface 7.
  • the outer surface 16 of the first leg 4 is parallel with the outer surface 17 of the second leg 6.
  • the remaining part of the die member 1 From the first leg 4 towards an opposite end 13 of the die member 1, in the extension of the outer surface 16 of the first leg 4 in said longitudinal direction x, the remaining part of the die member 1 has an outer surface 18 which is in alignment with the outer surface 16 of the first leg 4. From the second leg 6 towards an opposite end 13 of the die member 1, in the extension of the outer surface 17 of the second leg 6 in said longitudinal direction x, the remaining part of the die member 1 has an outer surface 19 which is in alignment with the outer surface 17 of the second leg 6.
  • This design makes it possible to machine a v-shaped recess in the end of a rectangular parallelepiped having such parallel outer surfaces as described above, and using the recess as a die cavity.
  • the recess can simply be displaced further into the rectangular parallelepiped by way of suitable machining, while the crucial geometric measures of the part of the die member 1 that defines the recess and, thereby, the die cavity remain the same.
  • the die member 1 is formed by a rectangular parallelepiped having neighbouring outer surfaces that are perpendicular to each other, wherein said v-shaped recess is formed into one end of the rectangular parallelepiped.
  • Figs. 6-9 show steps of a method of producing a die member 1 according the present disclosure.
  • a powder has been formed into two first green bodies that have been sintered and that are configured to form a first part 20, 21 of a die member 1 when later joined together.
  • the two first parts 20, 21 shown in fig. 6 are rectangular parallelepipeds, having the shapes of rectangular sheets with a respective thickness t 1 , t 2 .
  • t 1 t 2 .
  • the first two parts 20, 21 could be different from each other with regard to shape and/or thickness. This is depending on the design of the press tool or the specific design of the cutting insert green body to be compressed, and thus the design of a recess to be formed in the die member 1.
  • a second powder having a different microstructure and/or composition, than the powder forming the first green body, has been formed and sintered to form a second part 22 of the die member 1 when later joined together with the first part 20, 21.
  • the second part 22 has a thickness t 3 .
  • the second part 22 is aimed to form the tougher portion 9 disclosed hereinabove, and for that purpose, the thickness t 3 thereof is, in this embodiment, substantially smaller than the thickness t 1 , t 2 of the first parts 20, 21.
  • a different microstructure may, for example, be referring to a different carbide particle size, and a different composition may, for example, be referring to different binder content or a different type of carbide.
  • the first part 20, 21 is made of cemented carbide having a cobalt content of 3 to 13 wt% and the second part 22 is made of cemented carbide having a cobalt content of 6 to 25 wt%.
  • the first part 20, 21 is made of cemented carbide comprising tungsten carbide particles having an average grain size of 0.2 to 3.0 ⁇ m and the second part 22 is made of cemented carbide comprising tungsten carbide particles having an average grain size of 0.5 to 8.0 ⁇ m.
  • the second part 22 is sandwiched between the first parts 20, 21 and attached to said second part by means of sintering, wherein, in the interfaces between the first parts and the second part, a binder in the first parts and a binder in the second part are molten during said sintering.
  • a rectangular parallelepiped has thus been formed.
  • a v-shaped recess is machined into an end of the body formed by said first and second parts, such that a die member 1, indicated in fig. 9 , having the shape disclosed hereinabove is obtained.
  • At least one of the green bodies may be formed by, for example, any of the following forming methods: extrusion, powder injection moulding or additive manufacturing.
  • die surfaces 5, 7 are shown in the figures as planar surfaces and in cross sections as straight lines, it should be understood that the die surfaces may be non-planar corresponding to the green body geometry.
  • the present invention has been exemplified as comprised by two first bodies 20, 21 having rectangular parallelepiped shape and one second body having rectangular parallelepiped shape, other numbers and shapes of such bodies are within the claimed scope of the present invention in its widest sense, as long as at least one tough portion 9 is formed in the region of a corner 8 of the formed die member 1 as indicated hereinabove and as further defined in the appended patent claims.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Composite Materials (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Claims (13)

  1. Outil de compression destiné à la fabrication d'un corps cru de plaquette de coupe, ledit outil de compression comprenant :
    - au moins un élément de matrice (1) présentant une première patte (4) définissant une première surface de matrice (5) et une seconde patte (6) définissant une seconde surface de matrice (7), chaque patte (4, 6) présentant une base reliée à une partie restante de l'élément de matrice (1) et une extrémité libre respective (10, 11) au niveau d'une extrémité des premières et seconde surfaces de matrice (5, 7),
    - où lesdites première surface de matrice (5) et seconde surface de matrice (7) délimitent une cavité de matrice (3) dans laquelle ledit corps cru de plaquette de coupe est formé lors du compactage d'une poudre dans ladite cavité de matrice (3),
    - où, dans la région des bases desdites première et seconde pattes (4, 6), la cavité de matrice (3) présente une région de coin avec un coin (8) entre deux surfaces se rejoignant, lesquelles deux surfaces se rejoignant sont lesdites première et seconde surfaces de matrice (5, 7), et
    - où ledit élément de matrice (1) est constitué de carbure cémenté, et ledit outil de compression étant caractérisé en ce que, dans ladite région de coin, il existe une partie (9) de l'élément de matrice (1) dans laquelle le carbure cémenté présente une plus grande résistance par comparaison au carbure cémenté de l'élément de matrice (1) en s'écartant de la région de coin dans une direction allant vers l'extrémité libre respective (10, 11) de la première patte (4) et de la seconde patte (6).
  2. Outil de compression selon la revendication 1, caractérisé en ce que ladite partie (9) s'étend au moins sur une distance de 0,1 mm mesurée le long des première et seconde surfaces de matrice (5, 7) dans une direction (y) partant d'une pointe (23) du coin (8) et allant vers les extrémités libres (10, 11) de la première patte (4) et de la seconde patte (6).
  3. Outil de compression selon l'une quelconque des revendications 1 et 2, caractérisé en ce que ladite partie (9) s'étend sur pas plus de la moitié de la longueur des surfaces de matrice (5, 7) mesurée le long des première et seconde surfaces de matrice (5, 7) dans une direction (y) partant d'une pointe (23) du coin (8) et allant vers les extrémités libres (10, 11) de la première patte (4) et de la seconde patte (6).
  4. Outil de compression selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite partie (9) s'étend à partir d'une pointe (23) dudit coin (8) vers une extrémité opposée (13) de l'élément de matrice (1) dans une première direction (x) allant vers l'opposé desdites première et seconde pattes (4, 6) vers ladite extrémité opposée (13).
  5. Outil de compression selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ladite partie (9) s'étend le long dudit coin (8) à partir d'une première extrémité (14) vers une seconde extrémité opposée (15) dudit élément de matrice (1).
  6. Outil de compression selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, selon une vue d'observation sur un plan perpendiculairement à une première direction (x) allant d'une pointe (23) du coin vers une extrémité opposée (13) de l'élément de matrice (1), ladite partie (9) présente une section en coupe transversale rectangulaire.
  7. Outil de compression selon l'une quelconque des revendications 1 à 6, caractérisé en ce que, selon une vue d'observation sur un plan perpendiculairement à une première direction (x) allant d'une pointe (23) du coin vers une extrémité opposée (13) de l'élément de matrice (1), ladite partie (9) présente une section en coupe transversale ovale ou circulaire.
  8. Outil de compression selon l'une quelconque des revendications 1 à 7, caractérisé en ce que, selon une vue d'observation sur un plan perpendiculairement à une première direction (x) allant d'une pointe (23) du coin (8) vers une extrémité opposée (13) de l'élément de matrice (1), ladite partie (9) présente la même section en coupe transversale sur toute sa longueur de la pointe (23) du coin (8) vers ladite extrémité opposée (13) de l'élément de matrice (1).
  9. Outil de compression selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la première patte (4) présente une forme biseautée et la seconde patte (6) présente une forme biseautée, chacune avec une base reliée à une partie restante de l'élément de matrice (1) et une extrémité libre respective (10, 11) à une extrémité des première et seconde surfaces de matrice (5, 7) opposée audit coin (8).
  10. Outil de compression selon l'une quelconque des revendications 1 à 9, caractérisé en ce que le carbure cémenté formant ladite partie (9) présente une taille de particules de carbure moyenne plus importante par comparaison au carbure cémenté formant la première patte (4) et la seconde patte (6).
  11. Outil de compression selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le carbure cémenté comprend des particules de carbure de tungstène dans une matrice constituée d'un liant de cobalt, et le carbure cémenté formant ladite partie (9) présente une teneur en cobalt plus importante par comparaison au carbure cémenté formant la première patte (4) et la seconde patte (6).
  12. Outil de compression selon l'une quelconque des revendications 1 à 11, caractérisé en ce qu'il comprend un premier élément de matrice (1) selon l'une quelconque des revendications 1 à 14 et un second élément de matrice correspondant (2), lesquels premier et second éléments de matrice (1, 2) sont configurés pour être positionnés avec des extrémités libres (10, 11) de leurs premières et secondes pattes respectives (4, 6) orientées les unes vers les autres et définissant ainsi une cavité de matrice (3), et au moins un poinçon (24, 25) agencé pour être introduit dans la cavité de matrice (3) définie par le premier élément de matrice (1) et le second élément de matrice (1) aux fins d'un compactage d'une poudre introduite dans ladite cavité de matrice (3).
  13. Procédé de production d'un outil de compression selon l'une quelconque des revendications 1 à 12, comprenant les étapes consistant à :
    - former un premier corps cru configuré pour former une première partie (20, 21) d'un élément de matrice (1),
    - former un second corps cru configuré pour former une seconde partie (22) d'un élément de matrice (1),
    - fritter le premier corps cru en une première partie (20, 21) de l'élément de matrice (1),
    - fritter le second corps cru en une seconde partie (22) de l'élément de matrice (1), laquelle seconde partie formera ladite partie (9) de l'élément de matrice (1) lorsqu'elle sera liée à la première partie (20, 21), et
    - lier la première partie (20, 21) à la seconde partie (22) au moyen d'un frittage, où, dans une interface entre la première partie et la seconde partie, un liant dans la première partie et un liant dans la seconde partie sont fondus durant ledit frittage.
EP19157928.3A 2019-02-19 2019-02-19 Outil de compression Active EP3698901B1 (fr)

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EP19157928.3A EP3698901B1 (fr) 2019-02-19 2019-02-19 Outil de compression
JP2020021988A JP7478545B2 (ja) 2019-02-19 2020-02-13 プレス工具、及びプレス工具の製造方法

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Application Number Priority Date Filing Date Title
EP19157928.3A EP3698901B1 (fr) 2019-02-19 2019-02-19 Outil de compression

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US5543235A (en) * 1994-04-26 1996-08-06 Sintermet Multiple grade cemented carbide articles and a method of making the same
JP2003193168A (ja) 2001-12-28 2003-07-09 Honda Motor Co Ltd 傾斜複合材およびその製造方法
JP5850495B2 (ja) 2011-11-21 2016-02-03 国立研究開発法人産業技術総合研究所 高硬度・高靱性サーメット
JP5152770B1 (ja) 2012-02-20 2013-02-27 有限会社Ｍｔｓ 強靭超硬合金の製造方法
AT14230U1 (de) * 2014-02-17 2015-06-15 Ceratizit Austria Gmbh Formwerkzeug, Verfahren zur Herstellung eines Grünlings und Verwendung des Formwerkzeugs
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EP3698901A1 (fr) 2020-08-26
JP2020168660A (ja) 2020-10-15

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