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WO2006060906A1 - Dispositif et procede pour lubrifier la surface de paroi d'une empreinte - Google Patents

Dispositif et procede pour lubrifier la surface de paroi d'une empreinte Download PDF

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Publication number
WO2006060906A1
WO2006060906A1 PCT/CA2005/001851 CA2005001851W WO2006060906A1 WO 2006060906 A1 WO2006060906 A1 WO 2006060906A1 CA 2005001851 W CA2005001851 W CA 2005001851W WO 2006060906 A1 WO2006060906 A1 WO 2006060906A1
Authority
WO
WIPO (PCT)
Prior art keywords
die cavity
die
lower punch
cavity
lubricant
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.)
Ceased
Application number
PCT/CA2005/001851
Other languages
English (en)
Inventor
Paul Caron
Patrick Lemieux
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.)
Imfine Inc
Original Assignee
Imfine Inc
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 Imfine Inc filed Critical Imfine Inc
Publication of WO2006060906A1 publication Critical patent/WO2006060906A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0011—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses lubricating means
    • 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
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0017—Deairing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention relates to metallic powders and, in particular, to an apparatus used for the compaction of such powders to form metallic parts.
  • this invention is not limited to the powder metallurgy field and can be applied in the pharmaceutical field for instance or any other fields requiring the lubrication of a die cavity prior to shaping.
  • the present invention is an improvement to US Patent No. 6,299,690 which patent includes a clear and complete description of the background art.
  • a press commonly used in P/M comprises a die 1 provided with a die cavity 2 for receiving the metal powder 3, a movable lower punch 4 for supporting the powder 3 within the cavity and an upper punch 5 for compacting the metal powder 3 with the lower punch 4.
  • a typical compaction cycle comprises the following steps, : a filling step (fig. 1a), a die closure step (fig 1 b), a compression step (fig.1c) and an ejection step (fig. 1d).
  • US patent No. 6,299,690 discloses a method of lubricating the wall surfaces of a die cavity used in powder metallurgy.
  • the method disclosed therein involves spraying the wall surfaces with dry tribocharged particles of a lubricant material.
  • the apparatus used to carry out the method disclosed comprises a plug member, which has a three-dimensional shape conforming generally to that of the article to be formed.
  • the plug member is slightly smaller than the article so that when the plug member is inserted into the die cavity, there is a small, but uniform, gap created between the outer wall surfaces of the plug member and the walls of the die cavity.
  • the plug member is secured to a dust-proof closing plate, devised to seal the die cavity .
  • the closing plate is provided with vent holes and the plug member has a plurality of spaced-apart tubes extending therethrough, and exiting at the bottom wall surface of the plug member.
  • the lubricant material which consists of dry lubricant particles, is fed from a reservoir of dry lubricant through the tubes of the plug member to be sprayed into the gap.
  • the lubricant particles are tribocharged. Consequently, as they enter the gap they are electrostatically attracted to the walls of the die cavity and adhere thereto. Any excess gas and lubricant exits the gap through the vent holes in the closing plate. A uniform thin coating of lubricant is created on the walls of the die cavity.
  • the green density of the article formed in the die is greater due to the fact that there is less lubricant material in the mixture of powder, and the ejection force required to remove the formed article from the die cavity is less than when dry lubricant is only mixed with the powders in a larger quantity as in methods and apparatus known prior to US
  • An object of the present invention is to provide an apparatus and a method for lubricating die walls that satisfies the above-mentioned need.
  • Another object is to provide an apparatus and a method for lubricating die walls with a uniform film of dry lubricant while at the same time avoiding turbulent gas flow in the cavity, and that without requiring the utilization of a plug member.
  • an apparatus for lubricating a wall surface of a die cavity in which a powder will be compacted to form a three-dimensional article and from which the article will be ejected, the die cavity being part of a press comprising:
  • - a die with opposite top and bottom faces, provided with said die cavity spanning from the top face to the bottom face, the cavity having die walls defining the shape of the article and opposite top and bottom open ends;
  • the apparatus for lubricating the wall surface of the die cavity comprising:
  • - supply means for supplying dry tribocharged particles of a lubricant material on said walls of the cavity prior to filling the powder, said supply means including a pressurized dry gas; and - venting means for venting excess gas and lubricant from the die cavity;
  • said supply means comprising an injector connectable to one of the top and bottom end of the die cavity for injecting the lubricant material into the die cavity;
  • venting means comprising a vent passage located on an opposite end of the die cavity with respect to said injector such that the lubricant material injected into the die cavity travels in a one way direction from the injector to the vent passage.
  • the apparatus of the invention provides for a unidirectional injection of the tribocharged particles within the die cavity by simply injecting the triborcharged particles from one end of the cavity and venting the excess gas and lubricant particles from the opposite end.
  • the apparatus of the present invention provides an alternative solution to the lubrification of very deep cavities with presses that do not allow sufficient space between the upper punch and the die to be able to use a very long plug member and insert it into the die.
  • the apparatus of the present invention still have the advantage of providing an accelerated die wall lubrication step since it requires shorter movement and is thus more rapid.
  • the present invention provides the following advantages: - eliminatation or reduction as much as possible of the ratio of internal lubricant to admixed metal powder compositions;
  • the metallic parts made with the apparatus of the present invention have an improved surface finish and green density
  • Figure 1a to 1d are schematic views of a powder metallurgy compaction press known in the prior art, showing a typical compaction cycle.
  • Figure 2 is a schematic side view of an apparatus for lubricating die walls according to a first variant of a first preferred embodiment of the invention.
  • Figure 3 is a schematic side view of a second variant of the apparatus of figure 2 shown without the injection cover plate, and which variant is used for forming annular shaped article; figure 3b is a close up view of the encircled zone in figure 3a
  • Figure 4 is a schematic side view of a third variant of the apparatus of figure 2, shown with only the top portion of the lower punch and core rod.
  • Figure 5a is a schematic side view of an apparatus for lubricating die walls according to a second preferred embodiment of the invention, shown without the injection cover plate and with only the top portion of the lower punch and core rod;
  • figure 5b is schematic side view of the lower punch shown in figure 5a;
  • figure 5c is a top view of the lower punch of figure 5a;
  • figure 5d is a side view of the core rod shown in figure 5a.
  • figure 6a is a schematic side view of an apparatus for lubricating die walls according to a third preferred embodiment of the invention
  • figure 6b is a side view of the die shown in figure 6a.
  • Figure 7 is a schematic side view of an apparatus for lubricating die walls according to a fourth preferred embodiment of the invention.
  • Figure 8 schematic side view of an apparatus for lubricating die walls according to a fifth preferred embodiment of the invention.
  • Figure 9 is a graph showing the ejection shearing stress of different mixes compressed at 827 Mpa (60 tsi) with (B) and without (A) die wall lubrication applied with the embodiment shown in figures 2, 6 or 7.
  • the apparatus 10 is for lubricating the wall surface 12 of a die cavity 14 in which a powder will be compacted to form a three- dimensional article and from which the article will be ejected.
  • the die cavity 14 is part of a typical press which comprises a die 16 provided with said die cavity 14 spanning from the top face 18 to the bottom face 20 of the die 16.
  • the cavity 14 has die walls 12 defining the shape of the article.
  • the press further comprises a lower punch 22 and an upper punch, such as the one shown in figure 1a to 1d).
  • the lower and upper punch are movable relative to and within the die cavity for compacting the powder.
  • the apparatus for lubricating the wall surface of the die cavity 14 comprises supply means for supplying tribocharged particles of a lubricant material on the walls 12 of the cavity 14 prior to filling the powder; and venting means for venting excess gas and lubricant from the die cavity 4.
  • the supply means includes a pressurized gas (not illustrated).
  • the apparatus according to the invention is an improvement of the apparatus disclosed in US Patent No. 6,299,690 in that the supply means comprises an injector 30 sealingly connectable to one of the top and bottom end of the die cavity 14 for injecting the lubricant material into the die cavity 14; and the venting means comprises a vent passage 42 located on an opposite end of the die cavity 14 with respect to the injector 30 such that the lubricant material injected into the die cavity 14 travels in a one way direction from the injector 30 to the vent passage 42.
  • the injector 30 and the vent passage 42 can take various shapes as long as they are located on opposite sides of the die cavity 14 so as to cause the lubricant material to travel in a one way direction within cavity 14.
  • FIGS 2 to 4 show three variants of the first preferred embodiment which uses as the vent passage 40, vertical grooves 42 at the bottom end of the wall cavity 14.
  • vent passage 40 is located at the bottom end of the cavity 14; and the injector 30 comprises a cover plate 32 for covering the top end of the die cavity 14.
  • the cover plate 32 comprises an inlet 34 for receiving, via tubing 36, the tribocharged particles from a source of tribocharged particles and an outlet 38 in fluid communication with the inlet 34 and facing the die cavity 14 to inject the tribocharged particles within the die cavity 14. More preferably the cover plate 32 contains a conical gap cavity 39 between the inlet 34 and the outlet 36 to deflect spray coming from the tubing 36 along the die walls 14.
  • the venting means that provides the vent passage 40, comprises the lower punch 22 in a partially introduced position within the die cavity (also referred to as a lower punch level) associated with the vertical grooves 42 provided at the bottom end of the wall cavity 14.
  • a lower punch level also referred to as a lower punch level
  • These substantially vertical grooves 42 originate above the lower punch level and end at the bottom end of the die cavity, such that the grooves define the vent passage between the lower punch and the die wall.
  • top face of the lower punch extends just above the bottom face of the die, as in Figures 2, 3, 4, 5a, 6 and 7.
  • the lower punch 22 is solid, that is to say not hollow, whereas the lower punch 22 of the second and third variant (figures 3 and 4) is hollowed, the latter variants being used to form an article with an annular-shaped portion, such as ring shaped parts.
  • the top face 24 of hollow lower punch 22 is provided with a hole 26 sized to receive in a close-fit relationship a core rod 50 used for forming the annular three-dimensional article.
  • the core rod 50 is slidably received in the lower punch 22 for forming the ring-shaped piece.
  • the core rod 50 has a plurality of substantially vertical continuous grooves 52 located in a median section 54 thereof and the lower punch 22 has an inner wall 28 spaced from the core rod 50 so that a gap 29 is present between the inner wall 28 and the core rod 50. Therefore, an additional vent passage is obtained by positioning the median section 54 of the core rod 50 at the level of the top face 24 of the lower punch 22 such that the die cavity 14 and the gap 29 are brought in fluid communication via the vertical grooves 52 of the core rod 50.
  • a shoulder-shaped relief 23 defining the entry for the core rod 50 could be machined in the top part of the lower punch 22 for receiving the core rod 50 in a close-fit relationship.
  • the part has multi-levels.
  • the same principle is applied in combination with the use of a short plug member or confining block .
  • Spraying tubes 36 are fixed trough a die cover plate 32.
  • the second preferred embodiment is also devised to form ring-shaped parts.
  • the lower punch 22 has a non planar top face 24 and the venting means, providing the vent passage 40, comprises the lower punch 22 in a partially introduced position within the die cavity 14, as in the case of the first embodiment described above, such that the recesses 27 provided on the top face 24 of the punch 22 define the vent passage 40.
  • non planar top face 24 it is meant a top face that is provided with ridges 25 and recesses 27, or a concave or convex top face, or an irregular top face.
  • the core rod 50 which has a given diameter, presents along its length a median section 54 with a generally uniform diameter smaller than said given diameter.
  • the median section 54 divides the core rod 50 into a top part 56 and a bottom part 58, each of the top and bottom part (56, 58) having respectively a lower end 57 and an upper end 59 adjoining the median section 54 with a shoulder-shaped relief.
  • the lower punch 22 On its side, has an inner wall 28 spaced from the core rod 50 so that a gap 29 is present between the inner wall 28 and the core rod 50.
  • an additional vent passage is obtained by positioning the lower end 57 of the top part 56 of the core rod 50 at the level of the top face 24 of the lower punch 22 such that the die cavity 14 and the gap 29 are brought in fluid communication via the recesses 27 of the top face 24 of the lower punch 22 and the median section 54 of the core rod 50.
  • the vent passage 40 consist of at least one tunnel 60 through the die. More specifically, the tunnel 60 has an entry 62 in the die cavity 14 and an exit 64 in an outer wall surface of the die 16 such that the excess gas and lubricant exit the die cavity 14 via the tunnel (s) 60.
  • the tunnel (s) 60 is preferably obtained by providing the bottom face 20 of the die 16 with at least one groove 66 spanning from the die cavity 14 to the outer wall of the die 16 and by covering the die with a die extension 68 having at least one groove 69 on an upper face thereof complementary to the at least one groove 68 of the die 16 to form the tunnel (s) 60.
  • the tunnel(s) 60 may be formed by a die extension 68 (or machined plate) that is screwed under the die 16 before the final rectification to be sure for the alignment and clearance of the punch 22 in the die 16.
  • the lubricant particles are injected through the cover plate 32, as in the first and second embodiments
  • the fourth embodiment is also a variant of the third embodiment in that it also comprises at least one tunnel 60 extending through a bottom part of the die 16.
  • the lubricant particles are injected through the tunnel(s) 60 and the excess gas and lubricants are vented through a vent passage 40 located at the top end of the die cavity 14.
  • the vent passage 40 is provided with a vacuum shoe 41 positioned above the die cavity 14 during the time lower punch 22 is positioned for the shooting of the lubricant spray (mix of air or nitrogen or inert gaz and tribocharged particles,.
  • the lubricant is injected from the bottom of the die 16. More specifically, the lower punch 22 divides into a head section 72 and a bottom section 74.
  • the head section 72 has a diameter sized to snugly fit in the die cavity 14 and is provided with a plurality of substantially non ending vertical grooves 75 originating below a top end of the head section 72 and ending at a bottom end thereof, whereas the bottom section 74 has a diameter smaller such that a gap 76 is present between the die wall 12 and the bottom section 74 of the lower punch 22 when the lower punch 22 is in a fully inserted position within the die cavity 14 with the head portion 72 substantially levelled above the top face 18 of the die 16.
  • the vent passage 42 extends from the gap 76 and through the groove 75.
  • the lubricant particles are injected from the bottom end of the die cavity 14 and the excess gas and lubricant is vented from the top end of the cavity 14 through the vent passage 42 obtained when the head section 72 of the lower punch 22 is levelled above the top face 18 of the die 16.
  • vacuum is done above the die cavity with a vacuum shoe 41 to orientate the lubricant dust to enter the gap 76 all around the lower punch 22.
  • the vent passage 42 can also be obtained by levelling down the die 16 so as to let the lower punch 22 head section 72 exit the die 16 slightly more than when a part is ejected during the regular process.
  • the lower punch 72 then exposes its grooves 75 and the lubricant over spray can be vented by the vacuum system 41.
  • the lower punch 22 is levelled down or the die 16 is levelled up until the regular feeding position is reached. If the punch 22 is well ⁇ centered, lubricant coverage will not be or will be very partially swiped by the return of the punch to its initial powder feeding position. During its return, the lower punch can 22 bring powders with it, if the press feed shoe take rapidly the place of the vacuum shoe 41. This operation is called suction filling. It could be more rapid than "drop filling " or " gravity filling" operation, i.e., filling operation when the lower punch is already at its lowest position.
  • Cylinders of a diameter of 1 cm and a length of 3,7 cm were pressed with a die like in the first variant of the first embodiment (like in figure 2).
  • a uniform lubricant layer of a thickness of 25-100 ⁇ m was obtained.
  • the powder filling height was 2.1 times the thickness of the part formed like in regular powder metallurgy of iron or steel powders i.e 8 cm.
  • the die cavity sprayed was 1 cm in diameter and 9 cm height. If the technique used would have been the same as US Patent No. 6,299,690 , the plug member would have needed to be 8 cm long.
  • the coating head above the die cavity to move the plug member in and out of the cavity would have needed to be 8 cm height plus the thickness of the cover plate, the sailing and fixtures to move the plug member in and out of the cavity. Additional space would also have been needed for pneumatic or electric actuators or cylinders to move the plug member in and out. Pneumatic cylinder would have needed to be as long as the plug member displacement, i.e. 8 cm. This space is needed in addition of the plug member. The total height of the coating head would thus have needed to be approximately 20 cm. Ultimately, pneumatic cylinder of approximately 10 cm can be positioned to clear the upper punch (each side) height or thickness.
  • the coating head height or thickness was 1 cm for the cover plate plus the pneumatic actuators height.
  • pneumatic actuators installed were 2.5 cm height.
  • the total coating head height was 3.5 cm height.
  • Same result i.e. a white uniform coating of dry powder lubricant of a thickness 25-100 ⁇ m was also obtained i.e. like in the third embodiment, with the lower part of the die as in figure 6.
  • Same results were obtained like in the figure 7, i.e. by positioning the tubes in the hole of the figure 6. No cover plate was used when the configuration of the figure 7 was tried.
  • Figure 9 is a graph of ejection shearing stress or the force, needed to eject the powder compacted part from the die applied on the lower punch , divided by the surface of the powder compacted part in contact with the die wall during ejection.
  • the X axis represents the time needed to eject the part form the die at a constant speed. It can also be the position of the part in the die during ejection.
  • Mixes used contained 0.2% by weight of graphite.
  • the base iron powder was a water atomised powder grade commercially available. It was the ATOMET 1001 grade from Quebec Metal Powders Ltee. Mixes contained different amount of lubricant mixed with the powder.
  • a reference mix containing 0.75 % by weight of Ethylene bi stearamide (Acrawax C Atomized from Lonza), and a mix specifically developed to maximize density with the use of die wall lubrication, containing 0.4% of a newly developed Quebec Metal Powder proprietary lubricant. All parts were pressed with the same compacting pressure.
  • the compacting pressure is the force applied on the upper punch needed to press the powders divided by the surface of the part, or the die aperture surface.
  • the compacting pressure was 60 tsi or 827 Mpa.
  • curve A is for the pressing of the reference mix (0.75% EBS) without die wall lubrication. Part density was 7.22 g/cc. As seen maximum ejection shearing stress is ⁇ 1.3 tsi.
  • Curve B is for the pressing of the mix containing only 0.4% of internal lubricant with die wall lubrication illustrated in the figure 1 , 5 or 6. Parts obtained had a density of 7.41 g/cc. Maximum ejection shearing stress was only -0.9 tsi.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

L'invention concerne un perfectionnement apporté à un dispositif servant à lubrifier la surface de paroi d'une empreinte de presse de compactage, dans laquelle une poudre est comprimée en vue de former un article tridimensionnel et à partir de laquelle l'article est éjecté. La presse de compactage comprend un moule comportant des faces opposées, supérieure et inférieure, l'empreinte se déployant de la face supérieure à la face inférieure. La presse de compactage comprend en outre un poinçon inférieur et un poinçon supérieur pouvant être déplacés dans l'empreinte afin de compacter la poudre. Le dispositif de lubrification de la surface de paroi de l'empreinte comprend des moyens d'apport qui assurent l'apport de particules tribochargées d'une matière lubrifiante sur les parois de l'empreinte, avant que l'empreinte soit remplie de poudre, et des moyens de purge pour éliminer les gaz et le lubrifiant excédentaires de l'empreinte. Le perfectionnement comprend, comme moyens d'apport, un injecteur pouvant être relié de façon hermétique à l'extrémité supérieure ou à l'extrémité inférieure de l'empreinte en vue d'injecter la matière lubrifiante dans celle-ci; et, comme moyens de purge, un passage de purge prévu à l'extrémité opposée de l'empreinte, par rapport à l'injecteur, de sorte que la matière lubrifiante injectée dans l'empreinte ne se déplace que dans un sens, de l'injecteur vers le passage de purge.
PCT/CA2005/001851 2004-12-06 2005-12-06 Dispositif et procede pour lubrifier la surface de paroi d'une empreinte Ceased WO2006060906A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63298404P 2004-12-06 2004-12-06
US60/632,984 2004-12-06

Publications (1)

Publication Number Publication Date
WO2006060906A1 true WO2006060906A1 (fr) 2006-06-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008061342A1 (fr) * 2006-11-20 2008-05-29 Stackpole Limited Procédé et appareil de lubrification de paroi de matrice
WO2014036661A1 (fr) * 2012-09-10 2014-03-13 Nanogestion Inc. Techniques utilisant une seule étape pour la lubrification et le remplissage d'une empreinte de moule destinée à la fabrication de pièces à base de poudre métallique
EP3342586A4 (fr) * 2015-08-25 2018-09-26 Sumitomo Electric Industries, Ltd. Moule métallique de moulage à partir de poudres et procédé de fabrication de moulage compacté à partir de poudre
CN113619183A (zh) * 2021-08-13 2021-11-09 晋江市恒里机械配件有限公司 一种高自动化卧式废纸打包装置及工作方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995979A (en) * 1973-12-05 1976-12-07 Ing. C. Olivetti & C., S.P.A. Apparatus for lubricating moulds for blanks
CA1150028A (fr) * 1980-07-09 1983-07-19 Wallace A. Doepel Appareil pour fabriquer des comprimes
US5643630A (en) * 1994-04-08 1997-07-01 Wilhelm Fette Gmbh Method and device for depositing pulverized lubricants or parting compounds on the pressing tools of tabletting machines
US5992772A (en) * 1996-07-29 1999-11-30 Chem-Trend Incorporated Apparatus for dispensing lubricating powder
US6079968A (en) * 1996-11-14 2000-06-27 Bayer Aktiengesellschaft Device for the controlled spraying of pulverulent lubricants onto punches and dies of tableting presses
US6299690B1 (en) * 1999-11-18 2001-10-09 National Research Council Of Canada Die wall lubrication method and apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995979A (en) * 1973-12-05 1976-12-07 Ing. C. Olivetti & C., S.P.A. Apparatus for lubricating moulds for blanks
CA1150028A (fr) * 1980-07-09 1983-07-19 Wallace A. Doepel Appareil pour fabriquer des comprimes
US5643630A (en) * 1994-04-08 1997-07-01 Wilhelm Fette Gmbh Method and device for depositing pulverized lubricants or parting compounds on the pressing tools of tabletting machines
US5992772A (en) * 1996-07-29 1999-11-30 Chem-Trend Incorporated Apparatus for dispensing lubricating powder
US6079968A (en) * 1996-11-14 2000-06-27 Bayer Aktiengesellschaft Device for the controlled spraying of pulverulent lubricants onto punches and dies of tableting presses
US6299690B1 (en) * 1999-11-18 2001-10-09 National Research Council Of Canada Die wall lubrication method and apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008061342A1 (fr) * 2006-11-20 2008-05-29 Stackpole Limited Procédé et appareil de lubrification de paroi de matrice
WO2014036661A1 (fr) * 2012-09-10 2014-03-13 Nanogestion Inc. Techniques utilisant une seule étape pour la lubrification et le remplissage d'une empreinte de moule destinée à la fabrication de pièces à base de poudre métallique
EP3342586A4 (fr) * 2015-08-25 2018-09-26 Sumitomo Electric Industries, Ltd. Moule métallique de moulage à partir de poudres et procédé de fabrication de moulage compacté à partir de poudre
US11167517B2 (en) 2015-08-25 2021-11-09 Sumitomo Electric Industries, Ltd. Powder compaction mold and method for manufacturing powder compact
CN113619183A (zh) * 2021-08-13 2021-11-09 晋江市恒里机械配件有限公司 一种高自动化卧式废纸打包装置及工作方法
CN113619183B (zh) * 2021-08-13 2024-05-03 晋江市恒里机械配件有限公司 一种高自动化卧式废纸打包装置及工作方法

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