EP4056359A1 - Agencement de presse - Google Patents

Agencement de presse Download PDF

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Publication number
EP4056359A1
EP4056359A1 EP22160958.9A EP22160958A EP4056359A1 EP 4056359 A1 EP4056359 A1 EP 4056359A1 EP 22160958 A EP22160958 A EP 22160958A EP 4056359 A1 EP4056359 A1 EP 4056359A1
Authority
EP
European Patent Office
Prior art keywords
powder
sealing device
cavity
die
press 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.)
Pending
Application number
EP22160958.9A
Other languages
German (de)
English (en)
Inventor
Walter Rau
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.)
DORST Technologies GmbH and Co KG
Original Assignee
DORST Technologies GmbH and Co KG
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 DORST Technologies GmbH and Co KG filed Critical DORST Technologies GmbH and Co KG
Publication of EP4056359A1 publication Critical patent/EP4056359A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/04—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form with one ram per mould
    • 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
    • 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
    • B30B11/027—Particular press methods or systems

Definitions

  • the invention relates to a press device, in particular a metal powder and/or ceramic powder press device, and a method for powder pressing a powder pressed part, in particular a ceramic powder pressed part and/or metal powder pressed part.
  • powder press devices are known in principle from the prior art.
  • a cavity filling space
  • a stamp upper stamp then dips into the filling space (cavity) filled in this way in order to press the pressed part.
  • the filling shoe (filling slide or filler) can be moved over a cavity that is still closed. The die can then be lifted will. A filling space is then filled more evenly (than in the standard method described above).
  • the matrix When overfilling, the matrix can move (at least a little) higher, which results in a larger filling quantity. Before the filler (filling shoe or filling slide) is moved back, an actually required die height or filling height can be set. If necessary, excess powder can be wiped off the filling shoe.
  • the die When underfilling, the die can be raised after filling has taken place, so that the powder that is present sinks deeper into the die. The die can be closed before the stamp touches the powder. This can then possibly not escape.
  • the object of the invention is to propose a powder press device, in particular a metal powder and/or ceramic powder press device, in which the filling with powder, in particular also in the case of tapering and/or stepped punch geometries (upper punch geometries), is comparatively precise, in particular at least essentially without loss of powder or at least with only a comparatively small loss of powder. Furthermore, it is the object of the invention to propose a corresponding method.
  • a powder pressing device in particular metal powder and/or ceramic powder pressing device (metal powder and/or ceramic powder press), comprising at least one die, at least one (first) punch (upper punch), the (in a pressing position) from a first (upper) side into a cavity (die opening or cavity or filling space) filled with powder (ceramic and/or metal powder) of the die, and at least a powder sealing device that can be arranged at least in sections (preferably completely) around the cavity (or an upper edge of the same), in particular at least two-part powder sealing device.
  • a powder pressing device in particular metal powder and/or ceramic powder pressing device (metal powder and/or ceramic powder press)
  • metal powder and/or ceramic powder pressing device metal powder and/or ceramic powder press
  • One idea of the invention is to provide a powder sealing device that can be arranged around the cavity (or an upper edge thereof) in such a way that when the punch (upper punch) dips into the cavity, this is at least essentially prevented (or at least reduced). is) that powder is conveyed out of the cavity (e.g. spattered out and/or pushed out). As a result, a more precise setting of that powder volume can be achieved that is ultimately also pressed to form the pressed part. Furthermore, powder losses can be reduced.
  • An arrangement around the cavity (or an upper edge thereof) is to be understood in particular as an arrangement in which the powder sealing device runs along the (upper) edge of the cavity. At least in one position (e.g. an initial position when a tapered end portion of the punch or an end portion with a comparatively small diameter dips into the cavity), the powder sealing device can also overlap with a cross-sectional area of the cavity (at the level of an upper die surface) (in a projection of the sealing device onto this plane).
  • the sealing device is arranged in such a way that it (at least in any sealing position) lies outside of this cross-sectional area of the cavity (but preferably directly adjoins the stamp, possibly apart from a smaller distance to form a gap compared to the stamp). In further embodiments, this is the case at least in a (sealing) position of the sealing device, in particular in an end position (in which the plunger has completed its maximum path into the cavity).
  • An at least sectional (partial) arrangement around the cavity is to be understood in particular as an arrangement in which the sealing device covers the edge of the cavity over an angular range of at least 180°, preferably at least 270°, even more preferably at least 350°, possibly at least Surrounds (or is arranged along the same) 359° or 360°.
  • the powder sealing device is preferably adjustable. If the powder sealing device is designed in two or more parts, these two or more parts of the powder sealing device can preferably move relative to one another (in particular in the direction of an upper die surface). The two or more parts can preferably completely separate from each other (so that they are no longer connected). If necessary, it would also be conceivable for the two or more parts to be connected to one another (at least over a specific range of a relative movement) by a connecting and/or coupling device (allowing a change in distance to the relative movement).
  • the sealing device is preferably movable (at least partially, in the case of two or more parts this preferably applies to several or all of these several parts) transversely to a direction of movement of the stamp (in the case of several parts this also applies in particular to a relative movement of the individual parts to one another), preferably along a surface adjacent to the cavity of the die.
  • the sealing device (or parts thereof) is particularly preferably displaceable, in particular in such a way that during the movement or adjustment it is moved (slides) along a surface of the die adjoining the cavity. In this way, the sealing device can be precisely positioned in a particularly simple manner so that it can implement its sealing function.
  • the sealing device can remain in the same place within the cavity during a movement of the upper punch (or its distal end) (or in conceivable alternative embodiments can be moved during the same).
  • a movement transverse to a direction of movement of the ram is to be understood in particular as meaning that the sealing device can be moved at a 90° angle (possibly exclusively at such an angle) relative to the direction of movement of the ram (from top to bottom).
  • the movement it would also be conceivable for the movement to take place at an angle of at least 10° or at least 30° or at least 60° or at most 90° or at most 80° with respect to the direction of movement of the plunger.
  • the movability of the sealing device or its specific movement changes during the bringing into a sealing position.
  • the sealing device can also be implemented by pivoting the same or parts thereof (possibly relative to one another). Even more generally, the sealing device can be moved purely translationally or purely rotationally or both translationally and rotationally in order to bring it into a sealing position (this can also apply to several or all of possibly several mutually movable parts of the sealing device).
  • At least part of the sealing device is or can be arranged on a filling shoe (filler), for example designed as an integral part thereof or attached or attachable to it.
  • a first part of the sealing device is preferably arranged or can be arranged on a first filling shoe (filler), for example designed as an integral part thereof or attached or attachable to it, and a second part of the sealing device is arranged or can be arranged on a second filling shoe (filler), for example as a integral part thereof formed or attached or attachable.
  • the sealing device or the (respective) first or second part can be screwed and/or welded to the (respective) filling shoe and/or attached by a clamping and/or tensioning device and/or in another way .
  • the corresponding filling shoe (or the overall structure, comprising the sealing device or its first/second/additional part) can fulfill a double function in a simple manner, namely, on the one hand, the powder in the direction of the hollow space (cavity) to transport to bring the powder into the cavity, on the one hand, and, on the other hand, to realize a seal.
  • the same drive device can be used to realize both the movement of the filling shoe for filling the cavity and the movement of the filling shoe (or the structure with the sealing device or the part thereof) for sealing.
  • a distal end of the stamp is preferably designed such that a projection of a cross section of this distal end onto a plane of the (upper) surface of the die or of an upper cross section of the cavity is at least partially spaced from an edge of the cavity.
  • the spacing from the edge of the cavity can, for example, be at least 0.1 mm or at least 0.5 mm or at least 1.0 mm and/or at most 1.0 cm (over at least an angular area of 180° of the edge, possibly the entire edge).
  • inserting the (upper) punch into the powder-filled cavity—without the sealing device according to the invention— would lead to a particularly marked extent to powder being pressed out of the cavity (or spraying out). This is advantageously prevented or at least reduced by the sealing device.
  • the (upper) punch tapers at least in sections in the direction of its distal end.
  • the stamp can be bevelled and/or have a step and/or at least one rounding and/or arc shape, at least in sections (in at least one longitudinal section; for example in a transition between two upper stamp sections), e.g. B. be rounded and/or rounded.
  • a chamfer is preferably understood to mean a chamfer that is planar and/or in the shape of a truncated cone at least in sections.
  • a distal end portion of the plunger can be formed by a cone or a truncated cone portion. It is conceivable that a distal end section of the stamp is formed by a (e.g. straight), in particular circular cylinder, which is adjoined by a further section of the stamp (e.g. another cylinder, in particular circular cylinder) which has a larger diameter (where a Transition between sections may be rounded).
  • the sealing device can be arranged around the stamp in such a way that there is a distance between the sealing device and stamp at least in sections (e.g. over an angular range of at least 180° or at least 270° or at least 350° or 360°), in particular in Form of a, possibly circumferential, gap is formed such that air can escape from the hollow space (the cavity).
  • the distance is preferably at least 10 microns and/or at most 500 microns or at most 300 microns or at most 100 microns. Such a distance (gap) allows air to escape from the cavity despite the sealing device, so that (undesirable) air compression does not occur here.
  • the sealing means (when sealing) is in close contact with a surface (top surface of the die) surrounding the cavity.
  • the sealing device is flat on its underside, with this flat underside (tightly) abutting or being able to abut the (upper) surface of the matrix.
  • the sealing device can have at least two segments (parts) that can be adjusted relative to one another (particularly if necessary butt touching) and that preferably engage with one another when the sealing device is in the sealing state, in particular via at least one projection that engages with at least one recess.
  • An engagement can preferably take place via a zigzag structure or sawtooth structure and/or via a tongue and groove connection. The engagement preferably takes place in such a way that the two segments are connected to one another in such a way that the engagement counteracts a force (pointing in the direction of a connection plane), in particular from the inside outwards.
  • the sealing device can have at least or exactly two or at least or exactly three or at least or exactly four segments (parts) that can be adjusted relative to one another. If the sealing device has a plurality of segments (parts), these can preferably be adjusted independently of the other segments (parts). Alternatively, it is also possible that only a common (possibly synchronized) adjustment is possible or at least adjustable.
  • the above-mentioned object is also achieved in particular by a method for powder pressing a powder pressed part, in particular ceramic powder pressed part and/or metal powder pressed part, using the above press device.
  • powder is preferably filled in a cavity of the die, the sealing device is arranged around a die opening, and (then) the punch (punch) is immersed in the cavity (cavity) for pressing.
  • Further method features result from the above and/or following description of the press device. Functional features of the press device (or corresponding configurations of the same) can be implemented as concrete method steps.
  • the above-mentioned object is in particular also achieved by using a press device of the above type for powder pressing a powder compact, in particular for pressing a ceramic powder compact and/or metal powder compact.
  • the press device can generate a pressing force of at least 1.0 tons or at least 10 tons or at least 100 tons and/or at most 1000 tons.
  • FIG. 1 shows (in a schematic horizontal section) a press device comprising an upper punch 11, an (optional) lower punch 12, a die 13, a first filler 14 (filler shoe) and a second filler 15 (filling shoe).
  • a first part 16 of a sealing device 18 is attached to the first filler 14 .
  • a second part 17 of the sealing device 18 is attached to the second filler 15 .
  • the sealing device is designed in two parts (however, in alternative embodiments it can also have more than two parts).
  • the first part 16 is movable together with the first filler 14 (along a die surface 19, in 1 to the left).
  • the second part 17 of the sealing device 18 (together with the second filler 15) can also be moved (along the surface 19) (in 1 To the right).
  • FIG. 1 shows a state of the press device before the upper punch dips into a cavity 20 within the die 13. As soon as the upper punch 11 enters the cavity 20 and touches the powder in this cavity 20, this leads to possible displacement and possible ejection of the powder from the cavity (if the sealing device 18 were not provided). However, the sealing device 18 prevents such a transport.
  • a punch with a beveled (truncated) end section and a step in 2 in alternative embodiments only one bevel or only one step and/or several steps and/or several bevels with different gradients can also be formed).
  • FIG. 3 A horizontal section of the press device according to 1 (or 2 ) is in Figures 3 and 4 shown.
  • the parts 16, 17 of the sealing device 18 are removed from the cavity below the punch 11 (and not in sealing position). It can be seen in particular that the parts 16, 17 of the sealing device 18 are attached to the respective filler (filler shoes) 14, 15 (or are integrated into a corresponding filler structure), so that they can be moved together with the respective filler and are therefore a sealing position (according to 4 ) can be brought.
  • the filling space seal separately from a (regular) filling shoe. This can be retracted parallel to the original filling shoe and/or in any twisted position in the plane, for example by an electric, hydraulic and/or pneumatic drive.
  • pivoting the device e.g. B. with a corresponding rotary drive conceivable.
  • FIG 5 A cross section of an alternative embodiment of the sealing device 18 (in a schematic horizontal section) is shown.
  • engagement structures 21, 22 here for example in the form of in particular sawtooth-like interlocking projections

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP22160958.9A 2021-03-09 2022-03-09 Agencement de presse Pending EP4056359A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021105649.7A DE102021105649A1 (de) 2021-03-09 2021-03-09 Presseneinrichtung

Publications (1)

Publication Number Publication Date
EP4056359A1 true EP4056359A1 (fr) 2022-09-14

Family

ID=80684109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22160958.9A Pending EP4056359A1 (fr) 2021-03-09 2022-03-09 Agencement de presse

Country Status (3)

Country Link
US (1) US20220288682A1 (fr)
EP (1) EP4056359A1 (fr)
DE (1) DE102021105649A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598016A (en) * 1950-04-17 1952-05-27 Hpm Dev Corp Apparatus for hot pressing powdered metals
US4544517A (en) * 1981-12-16 1985-10-01 General Electric Co. Automatic composite press technique for producing cutting inserts
EP0488334A2 (fr) * 1990-11-30 1992-06-03 Intermetallics Co., Ltd. Méthode de production d'un aimant permanent par formation d'un compact vert et fritté
DE102006051666A1 (de) * 2006-11-02 2008-05-08 Dorst Technologies Gmbh & Co. Kg Vorrichtung zum Pressen von Pressteilen mit einer Pressgut-Zuführungseinrichtung
JP2010007132A (ja) * 2008-06-27 2010-01-14 Hitachi Powdered Metals Co Ltd 偏肉形状部品の圧粉体成形方法および圧粉体成形金型装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5897826A (en) * 1996-06-14 1999-04-27 Materials Innovation, Inc. Pulsed pressurized powder feed system and method for uniform particulate material delivery
DE102008044687A1 (de) 2007-10-27 2009-04-30 Joint Solar Silicon Gmbh & Co. Kg Aufbereitung von Formlingen aus Reinstsilizium
US7850884B2 (en) 2009-04-01 2010-12-14 The Gillette Company Method of compacting material
JP6454697B2 (ja) * 2013-07-05 2019-01-16 サンドビック インテレクチュアル プロパティー アクティエボラーグ 切削インサート成形体を製造するための方法及び装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598016A (en) * 1950-04-17 1952-05-27 Hpm Dev Corp Apparatus for hot pressing powdered metals
US4544517A (en) * 1981-12-16 1985-10-01 General Electric Co. Automatic composite press technique for producing cutting inserts
EP0488334A2 (fr) * 1990-11-30 1992-06-03 Intermetallics Co., Ltd. Méthode de production d'un aimant permanent par formation d'un compact vert et fritté
DE102006051666A1 (de) * 2006-11-02 2008-05-08 Dorst Technologies Gmbh & Co. Kg Vorrichtung zum Pressen von Pressteilen mit einer Pressgut-Zuführungseinrichtung
JP2010007132A (ja) * 2008-06-27 2010-01-14 Hitachi Powdered Metals Co Ltd 偏肉形状部品の圧粉体成形方法および圧粉体成形金型装置

Also Published As

Publication number Publication date
DE102021105649A1 (de) 2022-09-15
US20220288682A1 (en) 2022-09-15

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