EP3015196A1 - Dispositif de fabrication d'un corps vert d'insert de coupe et procédé de compactage de poudre dans un corps vert d'insert de coupe au moyen dudit dispositif - Google Patents

Dispositif de fabrication d'un corps vert d'insert de coupe et procédé de compactage de poudre dans un corps vert d'insert de coupe au moyen dudit dispositif Download PDF

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Publication number
EP3015196A1
EP3015196A1 EP14191177.6A EP14191177A EP3015196A1 EP 3015196 A1 EP3015196 A1 EP 3015196A1 EP 14191177 A EP14191177 A EP 14191177A EP 3015196 A1 EP3015196 A1 EP 3015196A1
Authority
EP
European Patent Office
Prior art keywords
die
powder
path
opening
filling device
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Withdrawn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
EP14191177.6A
Other languages
German (de)
English (en)
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 EP14191177.6A priority Critical patent/EP3015196A1/fr
Priority to PCT/EP2015/074017 priority patent/WO2016066454A1/fr
Publication of EP3015196A1 publication Critical patent/EP3015196A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
    • B28B13/023—Feeding the moulding material in measured quantities from a container or silo by using a feed box transferring the moulding material from a hopper to the moulding cavities
    • 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
    • B22F3/004—Filling molds with powder
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • 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
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds
    • 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

Definitions

  • the present invention relates to a device for manufacturing a cutting insert green body by compacting a powder, said device comprising: a die for receiving said powder; at least one punch for compacting said powder received by said die, and; a powder-filling device for filling powder into the die, wherein, in an upper surface of at least one part of the die, the die comprises an upper opening through which said powder is introduced into the die and through which or towards which said punch may be forwarded into the die for the purpose of compacting powder introduced into the die, and wherein said upper opening is defined by an edge that presents a curvature other than planar.
  • the invention also relates to a method of compacting powder into a cutting insert green body, by means of a device according to the invention.
  • One way of solving the above-mentioned problem of non-uniform density, or at least suppressing/reducing such non-uniformity, would be to adapt the top surface of the column of powder filled into a die to the shape of the green body to be compacted. This can be achieved by providing the die with an upper opening through which powder is filled into the die, wherein said opening is defined by an edge that presents a curvature other than planar. Powder is filled into the die to such a level that it is in alignment with the edge that defines said opening.
  • EP 2 164 657 discloses a device and a method for manufacturing an end mill, in which there is formed a down-stepped portion on an upper surface of the die for the purpose of affecting the density distribution of the compacted green body to be formed in said die.
  • EP 2 164 657 does not mention how a powder filling device would be adapted to the non-planar configuration of the upper surface of the die, but is very clear on the point that there is needed a specific means for eliminating remaining powder from the top surface of the die, thereby indicating that there is a remaining problem related to the filling of powder, namely how to prevent excessive power from being left on the top surface of the die in the area of the down-stepped portion.
  • the object of the invention is achieved by means of the invention according to claim 1, characterised in that the upper surface of the die presents a path that, in one direction, extends rectilinearly from a laterally offset point on said upper surface to said upper opening and covers said upper opening and intersects said edge that defines said upper opening, wherein said path has a predetermined non-planar profile in a cross section perpendicularly to said direction, and that the powder-filling device has a bottom surface that at least partially presents a profile corresponding to said non-planar profile of said path. In said bottom surface, the powder-filling device has an opening through which powder is discharged into the die.
  • the upper surface of the column of powder that is provided in the die will present a profile corresponding to said non-planar profile.
  • the non-planar profile of the upper surface of the powder column is adapted to the geometry of the green body to be formed. Said profile may, but must not necessarily, resemble the shape of the upper surface of the green body to be shaped.
  • the non-planar profile may be designed so as to accomplish a more uniform density distribution in the green body to be compacted, or so as to accomplish a predetermined symmetry of the density distribution of the green body to be compacted.
  • the provision of the non-planar profile on an upper surface of a die part may primarily be to achieve other advantages, such as simplification of the die design rather than affecting the uniformity or symmetry of the density distribution of the green body.
  • the powder-filling device is enabled to be rectilinearly moved on and along said path in continuous contact with the upper surface of the die to and from said opening in said direction, and to overlap said opening.
  • an upper surface of the powder that has been introduced into the die will, preferably, be in alignment with said path and edge, of the upper surface of the die.
  • the powder-filling device has a bottom surface with a path that extends rectilinearly in one direction x and which has a profile in a cross-section perpendicular to said direction x that corresponds to the predetermined non-planar profile of said path of the upper surface of the die.
  • the path of the bottom surface of the powder-filling device is wide enough and long enough to be able to fully overlap the upper opening in the upper surface of the die.
  • the powder-filling device will be able of sliding along said path on the upper surface of the die and to fully overlap (cover) the upper opening in the latter, while being in alignment with the part of the path of the die that encloses said opening. Any excessive powder in the region of said upper opening on the upper surface of the die part after powder-filling will be effectively removed by the returning powder-filling device.
  • the powder-filling device has a bottom opening for discharge of powder into the die, wherein said path of the bottom surface covers said bottom opening.
  • the opening in the bottom of the powder-filling device will overlap the upper opening of the die when the powder-filling device is in a position in which filling of powder is executed.
  • the bottom opening of the powder-filling device has a size that is larger than the size of the upper opening in the die.
  • the bottom opening of the powder-filling device has a size that is equal to or smaller than the size of the upper opening in the die.
  • a region around said bottom opening in the bottom surface of the powder-filling device has a curvature corresponding to the curvature of the edge that defines the upper opening in the upper surface of the die, such that the bottom surface of the powder-filling device will be in sealing relation with said edge of the opening in the upper surface of the die when the powder-filling device is in an operative position on the die in which powder is filled into the die.
  • the powder-filling device is arranged so as to slide above and along said path of the upper surface of the die in said direction x in which said path of the upper surface of the die extends rectilinearly from said laterally offset point to said upper opening and to overlap said opening, wherein said path of the powder-filling device is arranged opposite to the path of the upper surface of the die and extends rectilinearly in the direction x in which the path of the upper surface of the die extends rectilinearly.
  • the path of the powder-filling device is arranged so as to be in supporting contact with said path of the die in connection to said sliding of the powder-filling device on the upper surface of the die.
  • the distance between the path of the powder filling device and the path of the die should be kept so small that it prevents powder from leaking into the space between said paths.
  • the non-planar profile of said path which is also adopted by the upper surface of the powder column residing in the die after powder-filling and removal of the powder-filling device, may be adapted to the of the green body to be compacted in order to achieve, or at least promote, uniform density distribution or symmetric density distribution of the green body to be compacted and may correspond to or resemble the shape of the upper surface of the green body to compacted.
  • the curvature of said edge that defines the upper opening in the upper surface of the die and intersects with said path corresponds to a curvature of an upper edge of a green body to be compacted in said die.
  • An upper edge of the green body is referred to as an upper lateral edge formed in the region in which the upper punch is as closest to an inner peripheral surface of the die.
  • said edge corresponds to a cutting edge of the cutting insert to be formed by sintering of the green body.
  • the curvature of said edge that defines said opening is not necessarily exactly identical to the curvature of said edge on the green body.
  • said punch comprises an abutment surface for abutment with the powder to be compacted, and an outer peripheral surface, and a punch edge at the intersection between the abutment surface and the outer peripheral surface, wherein the punch edge extends with a predetermined curvature around the circumference of the punch, which curvature corresponds the curvature of the edge that defines the opening in the upper surface of the die and intersects with said path.
  • This may be regarded as another way of expressing the same characteristic as defined in the previous paragraphs, but by connecting the shape of said edge to the shape of the punch rather than to the shape of a green body to be formed.
  • the edge that defines said opening is not necessarily exactly identical to the curvature of said punch edge in order to enable the formation of said path and/or it could have a larger amplitude than the punch edge.
  • the curvature of the edge that defines the opening in the upper surface of the die and, thereby, the profile of the path may be adapted to and resemble the shape of the abutment surface of the punch rather than just the curvature of the punch edge, for the purpose of accomplishing a more uniform or symmetric density distribution in the green body.
  • the profile of said path may deviate substantially from the shape of the upper surface of the green body to be compacted due to several reasons.
  • the profile of said path, and the curvature of said edge that defines the upper opening of the upper surface of the die may differ substantially from the shape of the upper surface of the green body to be compacted and from the curvature of the upper edge of the green body to be compacted, since the profile of said path and of the edge that defines said opening are designed in order to compensate for the poor filling caused by the obstructing press tool member.
  • said die is subdivided into a first lower die part and a second upper die part, and said upper surface of the die that comprises said path is an upper surface of the second upper die part.
  • the lower die part may be the die part that, together with an abutment surface of the upper punch and, preferably, an abutment surface of a lower punch, introduced into the lower die from a position below the lower die, defines the cavity that determines the geometry of the green body.
  • Said upper die part is provided with said path in an upper surface thereof.
  • the die parts are contiguously arranged and the powder is introduced into the die through an upper opening covered by said path in the upper die part and up to the level defined by the edge that defines the upper opening of the upper die part.
  • the upper die part may be removed from the lower die part for the purpose of facilitating removal of the compacted green body out of the first die part.
  • the lower die part, the upper die part, provided with said path, an upper punch and a lower punch define the cavity that determines the geometry of the green body to be compacted.
  • the green body will have a waist, of larger dimension than the rest of the green body and that is defined by the intersection between the lower die part and the upper die part.
  • the die is subdivided into a first lower die part and a second upper die part that are removable from each other, wherein said upper surface of the die that comprises said path is an upper surface of the first lower die part.
  • the lower die part may be the die part that, together with an abutment surface of the upper punch and an abutment surface of a lower punch, introduced into the lower die from a position below the lower die, defines the cavity that determines the geometry of the compacted green body.
  • the die parts are separated and the powder is introduced by means of a powder-filling device as previously disclosed into the die through an upper opening covered by said path of the lower die part and up to the level defined by the edge that defines the upper opening of the lower die part.
  • the upper die part may have a corresponding path on its lower surface, such that it may be in alignment with the lower die part and contiguously arranged in relation thereto during the subsequent compaction procedure.
  • the die parts are joined such that they are contiguously arranged and the compaction is effected by displacement of the upper punch downwards through the upper die part and into the lower die part.
  • a lower opening of the upper die part may be smaller than the upper opening of the lower die part, such that, during compaction, a thin rim formed by a lower surface of the upper die part overlaps said upper opening of the lower die part around said upper opening.
  • the edge that defines said upper opening of the lower die part may have a curvature corresponding to the curvature of an upper edge of the green body.
  • the inner peripheral surface of the lower die part widens towards said upper opening thereof.
  • the upper punch is forwarded only a very short distance into the lower die part until a punch edge of the punch is very close to the inner peripheral surface of the lower die part.
  • the upper die part may be removed from the lower die part for the purpose of facilitating removal of the compacted green body out of the first die part.
  • an important advantage of the invention is the enablement of a less complicated press tool design, possibly combined with the advantage of promoting improved density distribution and/or density distribution symmetry in the green body.
  • the green body will have a waist of larger dimension than the rest of the green body, said waist being defined by the intersection between the lower die part and the upper die part when these are contiguously arranged.
  • a lower opening of the upper die part comprises an edge with a curvature corresponding to the curvature of the edge that defines the upper opening in the upper surface of the lower die part.
  • the upper die part may have a corresponding path on its lower surface, such that it may be in alignment with the lower die part and contiguously arranged in relation thereto during the subsequent compaction procedure.
  • the object of the invention is also achieved by a method of compacting powder into a cutting insert green body, comprising the steps of,
  • the die is subdivided in a first lower die part and a second upper die part that are removable from each other, and said upper surface of the die that comprises said path is an upper surface of the first lower die part, wherein the method comprises the further steps of removing the second upper die part from the first lower die part before filling powder into the first lower die part, and placing the second upper die part on the first lower die part before compacting the powder by means of said punch.
  • Fig. 1a shows essential parts of a compaction device according to prior art, suitable for the pressing of powder into cutting insert green bodies.
  • the compaction device comprises a die 1, an upper punch 2 and a lower punch 3.
  • the die 1 defines a hollow space into which the upper punch 2 is introduced from above and the lower punch 3 is introduced from below.
  • powder here indicated with 5
  • a powder-filling device (not shown) which slides on an upper surface of the die 1 to a position above an upper opening therein and fills a die cavity defined by the die 1 and the lower punch 3 up to the level of the upper surface of the die 1, as shown in fig. 1a .
  • FIG. 1a there is also indicated the geometry of a green body, here indicated with 6, and the position that the latter will take in the die 1 when the powder 5 is compacted through a downward motion of the upper punch 2 and upward motion of the lower punch 3 from the respective positions thereof shown in fig. 1a .
  • the lower punch 3 Before introduction of the upper punch into the die 1, the lower punch 3 is normally retracted slightly downwards, such that the upper surface of the column of powder is lowered in relation to an upper surface of the die 1.
  • the geometry of the green body shown in fig. 1a is further shown in fig. 1b .
  • Section A will thus obtain a relative high density and section B a relative low density, all because the powder-filling device leaves a powder column with a flat top surface behind after filling the die cavity.
  • the present invention suggests a way of reducing/suppressing the density variations of prior art upon compaction of powder into a cutting insert green body by using a filling method and device hereinafter named a profile filling method and device.
  • a profile filling method and device By using the profile filling method by means of a custom designed powder-filling device, die table (optional) and die, the powder can be shaped into a specific profile using standard filling movements of a press.
  • the profile can be chosen in such a way that the powder columns at section A, B and anywhere else along the insert obtain the same or similar compaction ratio, thereby significantly uniforming the density distribution in the green body.
  • Fig. 2 shows a cross section of essential parts of a compaction device according to an embodiment of the present invention, aimed for the pressing of powder into cutting insert green bodies.
  • the shown parts may be identical to those shown in fig 1a in the sense that they are able of forming a green body of corresponding shape.
  • the characterising difference is the design of the upper surface of the die, which however only reveals itself in fig. 2 by the fact that the column of powder shown therein has a different shape than in fig. 1a .
  • the parts shown in fig. 2 belong to a device according to the present disclosure, they are given other numbers.
  • the powder 10 is shaped into a predetermined profile.
  • Crucial for the generation of the predetermined shape of the powder column is the shape of the upper surface of the die, as will be seen in fig. 3a .
  • the green body 11 may have the same geometry as the green body 6 shown in fig. 1a , since the inner peripheral surface of the die 7 that, together with the upper punch 8 and the lower punch 9, defines the cavity which defines the shape of the green body 11 is the same as the one shown in fig. 1a .
  • Fig. 3a is another figure showing essential parts of the compaction device according to an embodiment of the invention shown in fig. 2 .
  • the device presents features that make it suitable for forming the profile of the powder shown in fig. 2 .
  • the compaction device shown in figs. 2 and 3a-c comprises a die 7 for receiving powder 10, at least one punch (here at least the upper punch 8) for compacting said powder 10 received by said die 7 (the punches are though not shown in fig. 3a-c ), and a powder-filling device 12 for filling powder into the die 7.
  • the die 7 comprises an upper opening 14 through which said powder 10 is introduced into the die 7 and through which said punch 8 shown in fig.
  • the opening 14 is defined by an edge 15 that presents a curvature other than planar.
  • the upper surface 13 of the die 7 presents a path that, at least in one direction x, extends rectilinearly from a laterally offset point on said upper surface 13 to said upper opening 14 and covers said upper opening 14 and intersects said edge 15 that defines said upper opening 14, wherein said path has a predetermined non-planar profile in a cross section perpendicularly to said direction x, and wherein the powder-filling device 12 has a bottom surface that at least partially presents a profile corresponding to said non-planar profile.
  • At least a part of said path may be defined by a rim or the like, as shown in fig. 3a , that extends in said direction x and may be removable from the upper surface of the die 7, for possible exchange thereof.
  • a die table 16 that surrounds the die 7 and works as a further support surface for the powder-filling device 12.
  • the upper surface of the table 16 is in alignment with the upper surface 13 of the die 7.
  • the table 16 presents an extension of said path on the upper surface 13 of the die 7, thereby enabling further sliding of the powder-filling device 12 away from the die 7.
  • the presence of the table 16 is optional.
  • the powder-filling device 12 has a bottom surface 17 (see fig. 3b ) with a path that extends rectilinearly in one direction and which has a profile in a cross-section perpendicular to said direction that corresponds to the predetermined non-planar profile of said path of the upper surface 13 of the die 7.
  • the powder-filling device 12 has a bottom opening 18 for discharge of powder into the die 7, and said path of the bottom surface 17 covers said bottom opening 18.
  • the powder-filling device 12 When powder is to be filled into the die 7 through the upper opening 14 thereof, the powder-filling device 12 is positioned on the path of the die 7 such that the path of the bottom surface 17 of the powder-filling device 12 overlaps and is in alignment with the path of the die 7 in said direction x (see fig. 3c ).
  • the powder-filling device 12 is slid along the path of the die 7 in said direction x to a position in which the opening 18 in the bottom surface 17 thereof overlaps the upper opening 14 of the die 7, and powder is filled into said upper opening at least to the level of the edge 15 that defines said upper opening.
  • the powder filling device 12 is removed from the upper opening 14 of the die by means of sliding along said path on the upper surface of the die 7, either backwards towards the offset position from which it started or forwards, if the path on the upper surface 13 of the die 7 continues beyond the upper opening 14.
  • the powder-filling device 12 leaves behind it an upper surface 13 of the die 7 that is practically free from powder, except for the opening 14, which is has powder up to a level that is in alignment with said path on the upper surface 13 of the die 7.
  • the powder column will have an upper surface with a profile corresponding to the profile of said path, which may be the profile shown fig. 2 .
  • the upper opening 14 of the die is now exposed for introduction of the upper punch 8 from above for the purpose of compacting powder.
  • a lower punch introduced from below into the die may be retracted downwards such that the powder in the die is displaced downwards, and the upper surface of powder is lowered to a position not in alignment but below the level of said path of the upper surface of the die.
  • the upper punch is enabled to enter the die without immediately pressing powder out of the die.
  • the above-mentioned profile of the upper surface of the powder is maintained after said lowering thereof.
  • the bottom opening of the powder-filling device 12 would have a size that is larger than the size of the upper opening in the die, at least in a direction perpendicular to said direction x.
  • the bottom opening 18 of the powder-filling device 12 has a size that is equal to or smaller than the size of the upper opening 13 in the die 7 (see fig. 3b and 3c ).
  • a region around said bottom opening 18 in the bottom surface 17 of the powder-filling device 12 has a curvature corresponding to the curvature of the edge 15 that defines the upper opening 14 in the upper surface 13 of the die 7, such that the bottom surface 17 of the powder-filling device 12 will be in sealing relation with said edge 15 of the opening 14 in the upper surface 13 of the die 7 when the powder-filling device 12 is in an operative position on the die 7 in which powder is filled into the die 7.
  • Figs. 4a-4c shows an alternative embodiment for the compaction of an alternative green body (not shown) of the compaction device shown in figs. 3a-c , in which said edge that defines the opening in the upper surface of the die, the path of the upper surface of the die and the path of the lower surface of the powder-filling device have a different profile than in the embodiment shown in figs. 3a-c , such that the profile of upper surface of the column of powder after powder-filling will be different from the one shown in fig. 2 .
  • the components, apart from that difference are identical to those shown in figs. 3a-c , they are given the same reference numbers as those in figs. 3a-c added with the symbol '.
  • the operation and functionality of the device shown in figs. 4a-c is the same as for the device shown in figs. 3a-c .
  • Fig. 5 is a representation of an alternative to the profile shown in fig. 2 .
  • the punches are identical to those shown in fig. 2 , and are thus given the same reference numbers as those in fig. 2 .
  • the die is however different from the die 7 shown in fig. 2 in that it has an edge that defines an upper opening thereof that is different from that of fig. 1 in the respect that it has a curvature that will result in the profile shown in fig.
  • the die is therefore given the reference number 19.
  • the path in the upper surface of the die has profile perpendicularly to said direction x that corresponds to the profile of the upper surface of the powder column shown in fig. 5
  • the powder-filling device has a path on its bottom surface with a corresponding profile, all in accordance with the essential teaching of the invention.
  • Fig. 6 shows a further embodiment in which the die is subdivided into a first lower die part 7a and a second upper die part 7b, and said upper surface 13 of the die that comprises said path is an upper surface 13 of the second upper die part 7b.
  • the reasons for using a die subdivided into a lower die part and an upper die part may be diverse and the upper die part may be arranged so as to be displaced relative to the lower die part during the pressing operation or not.
  • One reason may be as follows:
  • the length of the upper negative section of a compaction tool for positive inserts is here indicated with HvN. It is of interest to be able to change this length, because a fixed length could limit the possibility to optimize the press cycle for powders with different filling properties that result in relatively large fill heights.
  • the relatively cheap wear plate that forms an upper die part 7b of the die potentially could be manufactured in a variety of heights (HvP), giving the possibility to optimize the HvN dimension.
  • Figs. 7 and 8 and 9 show an embodiment of such a device which comprises a die comprised by a lower die part 20 and an upper die part 21.
  • the upper die part 21 comprises an upper surface 24 which comprises an opening 25 defined by an edge 26 which is non-planar.
  • the device should be provided with a powder-filling device (not shown) that has a lower surface with a path with a profile corresponding to the profile of the upper surface 24 of the upper die part 21, such that it can fit into the path of the upper surface 24 of the upper die part 21.
  • Powder is introduced into the die by means of the powder-filling device in accordance with the teaching already described.
  • the upper punch 23 is introduced into the upper die part 21 through the opening 25 and forwarded such a distance into the lower die part 20 that a lower edge of the upper punch 23 is so close to the sloping inner peripheral surface of the lower die part 20 that the green body is defined by an upper surface of the lower punch 22, the inner peripheral surface of the lower die part 20 and a lower surface of the upper punch 23.
  • the upper die part 21 is removed from the lower die part 20, such that the green body only has to pass a release portion defined by the inner peripheral surface of the lower die part 20 above said level, and not pass through a punch channel provided in the upper die part 23.
  • Figs. 9 is a further view of the device for compaction of powder to a green body shown in figs. 7 and 8 .
  • Fig. 10a shows an embodiment according to which, as an alternative to powder-filling through an upper opening in the upper flat surface of an upper die part which can be flat enabling filling with a standard filling device with a lower flat surface, powder-filling may be done through an upper opening 28 in the upper surface 29 of the lower die part 30.
  • a path in accordance with the general teaching of the present invention is then arranged in the upper surface 29 of the lower die part 30, and the device comprises a powder-filling device 31 with a lower surface that presents a corresponding path or cross-section in accordance with the general teaching of the present invention and is arranged to be slid from a laterally offset position to a powder filling position along said path of the lower die part 30.
  • An upper die part 32 may, preferably, have a corresponding path on its lower surface, such that it may be in alignment with the lower die part 30 and contiguously arranged in relation thereto during the subsequent compaction procedure in which an upper punch 33 is forwarded through the upper die part 32 into the lower die part 30.
  • the upper die part 32 is removable from the lower die part 30, and removed from the latter during said powder-filling, and contiguously arranged in relation thereto during compaction.
  • a lower punch is retracted downwards in order to enable receipt of the amount of powder needed for the subsequent compaction.
  • the lower punch Prior to the compaction, the lower punch is forwarded upwards to transfer some of the powder into the upper die part 32 before the powder is compacted by both the upper punch 33 and the lower punch.
  • the upper die part 32 is once again removed from the lower die part 30 in order to enable ejection of the compacted green body, indicated with 34 in fig. 10b , from the lower die part 32 through the upper opening 28 in the upper surface 29 thereof.
  • the compacted green body 34 has an upper lateral edge 35 that has a curvature corresponding to the curvature of an edge that defines the upper opening 28 in the upper surface 29 of the lower die part 30.
  • the present invention may also be applied to cases in which the die is subdivided into a lower die part 36 and an upper die part 37 and in which the cavity 38 that defines the shape of the compacted green body is defined by an upper surface of a lower punch 39, the lower surface of an upper punch 40 and the inner peripheral surfaces of both the lower and the upper die parts 36, 37.
  • the intersection line 41 between an upper opening in the lower die part and a lower opening in the upper die part defines a waist of maximum width of the green body 42 to be compacted.
  • the compacted green body 42 is shown in fig. 12b .
  • An upper surface 43 of the lower die part 36 is provided with an opening 44 through which powder is introduced into the die by means of a powder-filling device 45.
  • a path in accordance with the general teaching of the invention defined hereinbefore is provided in said upper surface 43, as well as an upper opening 44.
  • a powder-filling device 45 according to the teaching of the present invention is arranged for the filling of powder into said opening.
  • the upper die part 37 is separated from the lower die part 36 to enable the powder-filling device 45 to slide on and along said path to its powder-filling position above the opening 44 in upper surface 43.
  • the lower punch 39 is temporarily retracted downwards to enable receipt of the amount of powder necessary for the subsequent compaction. Prior to the compaction the lower punch 39 is forwarded upwards to transfer some of the powder into the upper die part 37 before the powder is compacted by both the upper punch 40 and the lower punch 39.
  • the powder-filling device 45 is removed from said opening 44 by sliding along said path, and the upper die part 37 is positioned contiguously on top of the lower die part 36. During compaction, the upper punch 33 is moved towards the upper opening 44 in the lower die part 36 and towards the space that will define said cavity 38.
  • said path could instead be arranged in the upper surface of the upper die part, and the powder-filling device could be arranged to fill powder into the die from an opening in the upper surface of the upper die part, provided that the upper punch is able to be removed sufficiently upwards to enable such powder-filling.
  • Fig. 13 shows a cutting insert produced from a green body, such as the green body by way of sintering, wherein it is obviated that the invention, in order to be realised, may require a specific positioning of said path on the upper surface of the die in relation to a specific geometry of a green body which is defined by an inner peripheral surface of the die.
  • the insert shown in fig. 13 is a candidate for the filling method according to the present invention.
  • the orientation of the insert i.e. the cavity that defines the geometry of the green body to be produced in the die
  • this geometry could benefit from profile filling (see figure 13 ).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Powder Metallurgy (AREA)
EP14191177.6A 2014-10-30 2014-10-30 Dispositif de fabrication d'un corps vert d'insert de coupe et procédé de compactage de poudre dans un corps vert d'insert de coupe au moyen dudit dispositif Withdrawn EP3015196A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14191177.6A EP3015196A1 (fr) 2014-10-30 2014-10-30 Dispositif de fabrication d'un corps vert d'insert de coupe et procédé de compactage de poudre dans un corps vert d'insert de coupe au moyen dudit dispositif
PCT/EP2015/074017 WO2016066454A1 (fr) 2014-10-30 2015-10-16 Dispositif pour la fabrication d'un corps cru de plaquette de coupe et procédé de compression de poudre en un corps cru de plaquette de coupe au moyen dudit dispositif

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EP14191177.6A EP3015196A1 (fr) 2014-10-30 2014-10-30 Dispositif de fabrication d'un corps vert d'insert de coupe et procédé de compactage de poudre dans un corps vert d'insert de coupe au moyen dudit dispositif

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JP2016135494A (ja) * 2015-01-23 2016-07-28 三菱マテリアル株式会社 切削インサート用の圧粉体のプレス成形方法およびプレス成形金型
JP2016135495A (ja) * 2015-01-23 2016-07-28 三菱マテリアル株式会社 切削インサート用の圧粉体のプレス成形方法およびプレス成形金型
JP6354893B1 (ja) * 2017-05-29 2018-07-11 三菱マテリアル株式会社 切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置
WO2018221497A1 (fr) * 2017-05-29 2018-12-06 三菱マテリアル株式会社 Procédé de presse de moulage de poudre de comprimé cru pour insert de coupe, et dispositif de presse de moulage de poudre

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JP6380614B1 (ja) * 2017-05-29 2018-08-29 三菱マテリアル株式会社 切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置
US10724932B1 (en) * 2019-05-29 2020-07-28 The Boeing Company Monolithic precursor test coupons for testing material properties of metal-injection-molded components
CN112296332B (zh) * 2020-03-02 2022-08-16 余姚市盛达粉末冶金有限公司 一种粉末冶金模具及应用该模具的粉末冶金工艺
CN111360248B (zh) * 2020-03-31 2023-04-18 珠海精磁新材料技术有限公司 一种改进型一模多腔粉末冶金成型模具

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SU1708514A1 (ru) * 1989-06-21 1992-01-30 Республиканский инженерно-технический центр порошковой металлургии Устройство дл прессовани фасонных изделий из порошка
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JP6354893B1 (ja) * 2017-05-29 2018-07-11 三菱マテリアル株式会社 切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置
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CN110709193A (zh) * 2017-05-29 2020-01-17 三菱综合材料株式会社 切削刀片用压坯的粉末成型压制方法及粉末成型压制装置
KR20200013666A (ko) * 2017-05-29 2020-02-07 미쓰비시 마테리알 가부시키가이샤 절삭 인서트용 압분체의 분말 성형 프레스 방법 및 분말 성형 프레스 장치
EP3636368A4 (fr) * 2017-05-29 2020-09-30 Mitsubishi Materials Corporation Procédé de presse de moulage de poudre de comprimé cru pour insert de coupe, et dispositif de presse de moulage de poudre
CN110709193B (zh) * 2017-05-29 2022-03-15 三菱综合材料株式会社 切削刀片用压坯的粉末成型压制方法及粉末成型压制装置
US11666966B2 (en) 2017-05-29 2023-06-06 Mitsubishi Materials Corporation Powder molding press method of green compact for cutting insert, and powder molding press device

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