US3671157A - Die and punch assembly for compacting powder material - Google Patents

Die and punch assembly for compacting powder material Download PDF

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Publication number
US3671157A
US3671157A US109375A US3671157DA US3671157A US 3671157 A US3671157 A US 3671157A US 109375 A US109375 A US 109375A US 3671157D A US3671157D A US 3671157DA US 3671157 A US3671157 A US 3671157A
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punch
die
support
die cavity
bore
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Joseph E Smith
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Wolverine Pentronix Inc
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Wolverine Pentronix Inc
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    • 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

  • a die and punch assembly foruse onapowder compacting. press, for making articles compacted from a powder material.
  • the assembly comprisesfa die plateappropriately mounted to the press and includes one or more die cavities, each die cavity having telescopically arranged inner and outer punches adapted for movement relative to each other to form various shaped articles.
  • T e uter punch is actuated by a first punch support which, in ,turn, is carried by a pair of posts extending below; the die plate to permit reciprocal movement of the outer punch within-the die cavity, whilethe inner punch iscarried by a second punch support.which, in turn, is slidably.
  • An actuating stem operatively connected to one of the punch supports, is adapted to impart a reciprocal movement thereto and includes an adjustable abutment member adapted to engage the other punch supports to displace the latter in an upward direction together with the first punch support as, a unit after the actuating stem has moved the first suhsupporta predetermined distance toward the die cavity.
  • the secondpunch support has an adjustable, abutment member cooperating with the actuating stem ,to
  • a core rod' may be provided withor'ie enddisposed in a longitudinal bore formed-within the inner punch, while the other end of the core rod is fixedly mounted to a core rod support which in turn, is fixedly supported by the post below the second punch support.
  • Resilient means are provided between the actuatirrg fstern and the. second punch support to maintain the-secondpunch support in position relative to the die cavity when the second punch support is not'engagedby the. adjustable abutment member. carried by the actuatingste m A (I I) Description of the prior art The present inventionis an improvement over an apparatus. of the character provided-as part of the powder compacting press disclosed: in -the aforementita'nedUS.
  • Such'presses are the manufacture of computer memory cores, porous bearings and bushings, transistor headers, substrates for micro-circuits and the like.
  • Such computer memory cores, porous bearings and bushings, and the like may'have 'a'toroidal, cylindricahsquare or rectangular shape which often requires a high degree of dimensional controLFor instance, ferrite memory cores have dimen-' sionsranging from approximately .005" to' .015" in thickness and approximately .005" to' .025 in diameter,
  • the density of compacted articles of this character such as memory cores, must be held accurate, thereby making it necessary that the amount of powder pressed in each die cavity ofthe pres'sfrnust-be substantially the same and must be repetitively maintained within extremely close limits.
  • finished density of all finished articles must be the same, that is,they must be uniform; accordingly, the compress ing of the powdered material must be exact and repetitively constant. If these dimensional and density specifications" are notheld within the specified tolerances, the play-back level from the cores in the computer memory bank will not be substantially constant from core to core.”
  • the compacting press In order to-realize acceptable dimensional tolerances, it is necessary that the compacting press be capable of accurate adjustment of the movement of several component parts' 'within at least 25-50 millionths of an inch, and that precautions be taken to insure a correct fill of each die cavity r
  • the articles are compacted and formed in multi-ca'vity dies. Finished articles are automatically ejected from'the-die cavities, picked' up by a vacuum suction head, and delivered into, vials or bottles.
  • a flipperassembly which is part of the press, and which includes a secondary powder hopper, an anvil, and a vacuum pick-up head disposedsubstantially side-by-side', is mounted movable transversely over the'dieplate:
  • the secondary powder hopper which is supplied with pow der from a'primary hopper connected thereto b y'm'eans of a flexible tubing, is -first positioned over the" die"cavities which are filled with powder as the punchesa're displaced downwardly so as to draw into thedie cavities a predetermined amount ofpowder. l'he hopper is vibrated to aid in fillingeach die cavity.
  • the secondary "hopper is removed from over the die cavities by'a subsequent motion of 'the flipper assembly,'the edges of the hopperwiping the die plate surface clean from excess powder, and'is replaced "by the anvil which, in turn, is clamped into position on the upper surface of the die plate-and over the die'cavities.
  • the powder in each die cavity is com pactedagainst the anvil 'asthe result of displacing the punch toward the anvil surface.
  • the anvil is then removed from its position over the die cavity or cavities andreplace'd by the vacuum pick-up head.
  • the pu'nch or punches are then further upwardly displaced so as to bring-their, upper ends substantially flush or preferably slightly above the surface of the die plate so that the fin ished compacted articles are ejected from the die cavities and picked up by the pick-up head.
  • the pick-up head is then moved from over the die cavity or cavities and disposed over one or a series of discharge apertures arranged in a disposition similar to the arrangement of the die cavities in the die plate where the finished articles are dropped through the discharge aperture or apertures into suitable containers or the like simultaneously with the secondary hopper being positioned over the die cavities.
  • a punch and die assembly for forming an article having a toroidal, circular or cylindrical shape, which comprises a die plate having one or a plurality of equally spaced apertures and a punch associated with each of the apertures and adapted to be displaced in the aperture to form a confined die cavity for the powder material between the head of the punch and the surface of the anvil; and, if desired, a core rod may be provided for centrally apertured articles.
  • the core rods associated with each of the punches are axially adjustable within an axial longitudinal bore in the punch. The core rods are normally held stationary and thus only the movement of the punch or punches has to be precisely controlled to obtain the desired density and thickness of the finished article.
  • Such articles may be in the shape of cylindrical cups or flanged buttons, they may be provided with apertures parallel to their central axis and they may be used as miniature bearings or the like.
  • Such articles are generally made by extrusion, stamping, injection molding, or like processes which are relatively slow and expensive, or when they are made by powder material compacting methods they are made by means of complex multi-punch tools mounted in machines having a punch operating ram for each punch in the tools.
  • the present invention represents a further advancement over the prior art aforementioned application in that it provides an improved and considerably simplified structure including telescopically arranged punches which are axially movable relative to each other in a precisely adjusted relationship to compress powdered material within a die cavity to form shaped articles such as cup-shaped or flanged button-shaped parts, and the like, and which are actuated by the reciprocating motion of a single actuating ram or rod.
  • the present invention relates to a die and punch assembly for a powder compacting press for making from powder materials irregularly shaped articles such as cupshaped, flanged button-shaped parts and the like, comprising a multiple punch assembly for each die cavity, all the punches being actuated by a single control member and being axially movable relative to each other and one within the other in such a way that upon compaction of the powder in the die cavity in one example of the present invention flanged button-shaped articles are produced, and in another example of the invention cupshaped articles are produced.
  • Core rods may be provided extending through the central punch in case the shaped articles are to be provided with central apertures.
  • FIG. 1 represents a fragmentary vertical sectional view of a die and punch assembly as seen along line 1--1 of FIG. 6 and shown in fill position with a hopper over the die cavity and the die cavity filled with powdered material;
  • FIG. 2 represents a fragmentary vertical sectional view of the die and punch assembly as seen along line 2-2 of FIG. 6 with the assembly shown in fill position;
  • FIG. 3 represents a fragmentary vertical sectional view of a die and punch assembly as'seen along line 3-3 of FIG. 6 with the assembly shown in fill position;
  • FIG. 4 represents a fragmentary vertical sectional view similar to the die and punch assembly illustrated in FIG. 1 with an anvil disposed over the die cavity and the assembly shown in press position;
  • FIG. 5 represents a fragmentary vertical sectional view similar to FIG. 2 with an anvil disposed over the die cavity and the assembly shown in press position;
  • FIG. 6 represents a fragmentary bottom view of the die and punch assembly illustrated in FIG. 1;
  • FIG. 7 represents a fragmentary vertical sectional view of a modified die and punch assembly as seen along line 7-7 of FIG. 8 and shown in a fill position with a hopper over the die cavity and the die cavity filled with powdered material;
  • FIG. 8 represents a fragmentary bottom view of the die and punch assembly illustrated in FIG. 7;
  • FIG. 9 represents a fragmentary vertical sectional view of the modified die and punch assembly as seen along line 7-7 of FIG. 8 with an anvil disposed over the die cavity and the assembly shown in the press position;
  • FIG. 10 is a fragmentary sectional view of the modified die and punch assembly as seen along line 10-40 of FIG. 8.
  • FIGS. 1, 2 and 3 there is shown an example of the present invention in the form of a die and punch assembly 10 having a the plate '12 adapted to be seated in the counterbore 13 of a table '15 (FIG. 1) which, in turn, forms a portion of a powder compacting press (not shown).
  • the die plate 12 has a flat upper surface -14 and is held to the table 15 by any suitable means such as clamps, screws or the like (not shown).
  • the die plate 12 is provided with a cylindrically shaped aperture 18 formed about an axis 20 which is disposed normally to the upper surface 14 of the die plate 12.
  • a suitable adhesive material is Loctite which is described in greater detail hereinafter.
  • the manner in which the die bushing 22 is inserted within the aperture 18 is described in the aforementioned patent application Ser. No. 49,800, and a further description thereof is not necessary as the assembly features form no part of the present invention.
  • the die bushing 22 is inserted into the aperture 118 such that the upper surface 19 of the die bushing 22 is flush with the upper surface .14 of the die plate 12.
  • the die bushing 22 has a centrally disposed bore 24 which extends normally, downwardly from the upper surface 19 of the die bushing 22 and is provided with a chamfered portion 26 at thefl'ower end thereof. Although only one bore 24 is shown, it' is to be understood that the die bushing 22. may be provided with a plurality of mutually parallel bores disposed in a circular arrangement around the axis 20 ofthe die bushing 22 and havingla regular peripheral spacing with each of the parallel bores extending normally downwardly from the upper surface 19 of the die bushing 22 and each bore being provided with a chamfered portion 26 at the lower end thereof.
  • the die plate 12 is further provided with a pair of longitudinal bores 28 and 29 radiallyspaced from the axis 20 by a predetermined equal distance. Associated with eachbore 28 and '29 there is one of a pair of downwardly extending support posts 32 and 34 respectively. Support posts 32 and 34 are of an elongated cylindrical shape and are retained within their respective bores 28 and 29 with any suitable adhesive, or otherwise fastened into the bores 28 and 29 such as by a press-fit assembly or by means of set screws. v y I Axially centered within the die bushing 22 for.
  • a telescopic assembly 39 comprising a cylindrical inner punch 40 adapted for sliding movement within a cylindrical outer punch 42 which, inturn, is adapted to be axially aligned with and slidably engaged within the die bushing 24.
  • the lower end of the outer punch 42 is secured to anupper punch support 44 which is provided with a centrally disposed bore 46 supporting a cup-shaped support member 48 having an outer periphery complementary to the bore 46 of the upper punch support44.
  • the support member 48 has a shoulder 50 abutting an annular recess 52 formed in the bore 46 to provide axial support for the support member 48, while the support member 48, in turn, supports a punch insert 54 having.
  • the punch insert bore 56 and the outer punch 42 have an adhesive applied to their engaged surfaces to'secure the outer punch 42 therein.
  • the punch insert 54 is similarly bonded to the cup-shaped support member 48, while the support member 48 is, in turn, mounted t the upper punch support 44 by the adhesive.
  • the upper punch support 44 has a pair of longitudinalbores 58 and 60 which are radially spaced "from the axis 20' by the same distances as the die'plate bores 28'and 29 to permit a sliding engagement between the upper punch support 44 and the posts 32 and 34 respectively, and to axially align the upper end oftheouter punch 42 with the die bushing bore 24 such that the outer punch'42 extends axially upwardly fronrthe upper punch support 44 to register with the diebushing bore 24.
  • the inner punch 40 which is slidably disposed within a longitudinal bore 62in the outerpunch 42 extends downwardly through the cup-shaped support member'48 and is supported at its lower end by a lower punch support 64.
  • The'lower "punch support 64 isprovided with a centrally disposed bore 66 supporting acup-shaped member 68 having an outer periphery complementary to the bore 66 of the lower punch support 64 and includes a shoulder 70 mating withan annular recess 72 formed in the bore 66 toprovide axial support for the member 68.
  • the cupshaped support member 68 supports a punch insert 76 having a centrally disposed bore 78 in which the lower end of the inner punch 40*is received-"Hie punch insert 76, the innerpunch 40,'th ecup-shape'd sup port member 68 and the lower punch support 64 are all bonded to one another in the same "manner asher'einbefore described in the description of the upper punch support 44.
  • the lower punch support 64 has a pair of longitudinal bores 80 and 82 (FIG. 3) which are radially spaced from the axis 20 by the same distances as the die plate bores 28 and 29 to permit a sliding engagement between the lower punch support 64 and the posts 32 and 34, respectively, so as to align the upper end of the inner punch 40 with the longitudinal bore 62 of the outer punch 42, such that the inner punch 40 extends axially up from the lower punch support 64 through the cupshaped support member 48 to register with the outer punch bore 62 and to extend in axial alignment with the outer punch 42 into the die bushing bore 24.
  • outer diameters of the outer, punch 42 and the inner punch 40 accurately fit respectively the inner diameters of the die bushing bore 24 and the longitudinal bore 62 in the outer punch 42 and both project into the die bushing bore 24 such as to define a die cavity 86 therein.
  • the embodiment illustrated in FIGS. 14 may be provided with a core rod of the type similar to the core rod disclosed in the embodiment illustrated in FIGS. 7-10 and which will be described in greater detail hereinafter. I
  • a plurality of telescopic punch assemblies 39 are provided and arranged in the same configuration as the die bores such that each punch assembly 39 is disposed in axial alignment with its respective die bore.
  • the upper punch support 44 and the lower punch support 64 function to transmit an upwardly directed force from an actuating stem 88 to the powder material 90 (FIGS. 1-3) within the die cavity 86 to form a compacted cup-shaped article 92 (FIGS. 4 and 5) as will be described in greater detail hereinafter.
  • the upper punch support 44 is coupled to the actuating stem 88 by means of a plate member 94 and a pair of threaded fasteners 96.
  • the plate member 94 has a pair of diametrically opposed bores 98 and 100 (FIG. 3) which slidably engage the posts 32 and 34, respectively, to guide the plate member 94 during reciprocal movement thereof.
  • the plate member 94 is connected directly to the upper punch support 44 by the threaded fasteners 96 (only one of which is illustrated in FIG. 2), each of which extends axially upwardly through a bore 102 in the plate member 94 and threadedly engages the upper punch support 44 as shown at 104.
  • a sleeve member 106 surrounds each fastener 96 with the upper and lower end faces of each sleeve member 106 being respectively in abutment with the lower and upper surfaces of the upper punch support 44 and the plate member 94.
  • the actuating stem 88 has an upper end portion 108 bonded or otherwise attached to a bore 110 which is centrally disposed within the plate member 94.
  • Diametrically opposed bores 112 (FIG.
  • the fasteners 96 are angularl'y displaced from the support posts 32 and'34.
  • a spring128 (FIGS. 2 and 5) is disposed around each sleeve 106 with its opposite ends in abutment with the underside of the lower punch support 64 and the upper surface of the plate member '94, respectively, to bias the punch support 64 and the plate member 94 away from each other and maintain the lower punch support 64, and thus the inner punch 40, in a predetermined position relative to the plate member 94 and the die cavity bore 24 when the assembly is in the fill position illustrated in FIGS. 1-3.
  • the plate member 94 is also provided with diametrically opposed bores 114 (FIGS. 2 and 5), each having a threaded surface in which an adjustable abutment member 116 is threadedly engaged.
  • the upper ends 118 of the adjustable abutment members 116 are adapted to abut the lower surface of the lower punch support 64 when the actuating stem 88- moves the plate member 94 in an upwardly direction to drive the lower punch support 64 upwardly, and thus drive the inner punch 40 within the longitudinal bore 62 of the outer punch 42.
  • the lower punch support 64 also has diametrically opposed threaded bores 120 in which a second pair of mechanical abutment-members 122 are threadedly engaged and which extend down- Wardly therefrom and are slidably received in diametrically opposed bores 124 in the plate member 94.
  • Each member 122 has an enlarged end portion 126 which abuts the lower side of the plate member 94 when the actuating stem 88 is moved downwardly so as to drive the lower punch support 64 downwardly and withdraw the inner punch 40 from the die cavity bore 24.
  • a suitable adhesive which may be used between the bonded elements described hereinbefore may be of a commercial quick-setting bonding compound such as an anaerobic adhesive which will securely maintain the die bushing 22 within the aperture 18 when subjected to pressure during the compacting operation.
  • An example of'one of such bonding compounds is known and marketed under the name of Loctite manufactured by the Loctite Corporation, Newington, Connecticut.
  • the compound, particularly useful in the bonding of cylindrical parts is an anaerobic adhesive having unusually high shear strength exceeding that of conventional press-fitted parts by up to five times.
  • the Loctite retaining compound is-fast curing and has excellent heat and solvent characteristics, as well as providing high shear strength between adjoining interfaces. A more detailed description of the Loctite retaining compound may be had by reference to US. Patent No. 3,621,534.
  • a typical powder compacting cycle includes a powder filling step, a compacting step, and an ejection step.
  • the filling step is diagrammatically shown in FIGS. 1, 2 and 3 and comprises a powder supply device, which is commonly referred to as a hopper 130 and which is disposed over the die'plate 12 completely encompassing the die bushing 22 and which fills the die cavity 86 defined by the die cavity bore 24 and the upper ends of the inner and outer punches 40 and 42 with the powdered material 90.
  • the punches are displaced downwardly from the upper surface 19 of the die bushing 22 by the action of the actuating stem 88 being moved downwardly so as to insure that the cavity 86 is filled with the powdered material 90.
  • the hopper 130 may be vibrated to insure a complete filling of the-die cavity 86. After the filling operation, with the punches shown in the position of FIG. 1, the hopper 130 is removed -by means (not shown) and the upper surface 19 of the die bushing is wiped clean of any excess powder, which can be accomplished by the hopper 130 being moved transversely across the upper surface 19 of the die bushing 22.
  • the upper surface 19 of the die bushing 22 is preferably polished to a super-finish so that there is no possibility of any grain of powder remaining on the surface 19 after the wiping step.
  • an anvil 132 supported by any suitable means (not shown) is transferred over the filled die cavity 86 and clamped into position.
  • the upper ends 118 of the abutment members 116 carried by the plate member .94 are displaced from the lower surface of the lower punch support 64 by a predetermined amount which is dependent upon the amount of compaction desired.
  • the actuating stem 88 is actuated to move upwardly to compact the powder material within the die cavity 86-only the upper punch support 44, and thus only the outer punch 42 will initially move upwardly in the die bushing bore 24.
  • the anvil 132 is removed from over "the die cavity 86 and the inner and outer punches 40 'and'"42" are preferably displaced upwa'rdly so that their ends are substantially flush with the upper surfaces 19 of the'die bushing 22' so that'they eject the finished article 92 which may be picked up by any suitable means, such as the vacuum pick-up described in the aforementioned patents, removed from the'die cavity 86 anddeposited in any suitable container.
  • the'actuating stem 88 moves downwardly withdrawing only the outer punchd 42 downwardly in the die bushing bore 24, while the bias of thesprings 128 maintains the lower punch support 64 and thus the inner punch 40 man upward position with respect'to the die bushing bore 24 until the enlarged ends 126 of abutment members 122 carried by thelower punch support 64 are-engaged by the lower surface of the plate member 94, as shown in FIG. 1, 'at which time both the upper'and lower punch supports move-downwardly, together as a unit withdrawing the punches 40 and 42 from the die bushing bore 24 to their initial fill position wherein the cycle is repeated.
  • FIGS. 7-10 wherein another example of the present invention-is illustrated in the form of a die and punch assembly 200 which is adapted to compact articles in the sha'pe'of flanged buttons.
  • the die and punch assembly 200 has a die plate 212 adapted to be seated in the counterbore 214 of a table 215 (FIG. 7) which, in turn, forms a portion of-the aforementioned powder compacting press.
  • the die plate 212 which is similar to'the die plate 12' hereinbefore described, has a flat upper surface 216 and is held to the .table215 by any suitable means.
  • the die plate 212 is similarly provided with a cylindrically shaped aperture 218 formed about an vaxis 220 and accommodates a cylindrical shaped die bushing 222.
  • the die bushing 222 has a centrally disposed bore 224 which extends normally downwardly from the upper surface 221 of the die bushing and is shown with a ch mfered portion 226 at the lowerend thereof.
  • Thedie plate 212 is further provided with a pair of longitudinal bores 225 (onlyone of which is shown in FIG. 10) radially spaced from the axis 220tby equal distances and each bore 225accommodating one ofa pair of downwardly extending support posts 232 and 234 as shown in FIGS. 8 and 10.
  • Axiallycentered within the die bushing bore 218 for reciprocating movement is a telescopically engagingpunchassembly 238 comprising an inner punch 240 adapted for sliding movement within a longitudinal bore 241 of an outer punch 242, which, inturn, is axially aligned and slidably engaged within the die bushing bore 224.
  • the lower end of the outer punch 242 is secured within a centrally disposed bore 243 formed. in an upper punch support 248 by a suitable. adhesive, such as the aforementioned Loctite.
  • An annular shoulder 247 formed on the outer punch 242 abuts the upper surface of the upper punch support 248 and aids in the transmission of ,acompacting force, as will be describedhereinafter.
  • the upper punch support 248 has a pair of diametricallyopposed longitudinal bores 264; (only one of which is shown in FIG. 10) whichare radially spaced from the axis 220 by the same distances as the die plate bores 225 to permit a sliding engagement between the upper punch support 248 and.
  • .Iheinner punch .240 extends from the lower end of the outerpunch 242 and is supported at its lower end by a lower punch support 249 in a centrally disposed bore 251.
  • the interfaces of the inner punch240 andthe lower punch support 249 may be bonded by any suitable adhesive such as the aforementioned Loctite.
  • the lower .19.. punch 240 has an annular shoulder 253 which abuts the upper surface of the lower punch support -249yand functions to aid in transmitting the compacting force from the lower. punch support 249 to compact the powder material-within the die bushing bore 224,-The. lower punch support 249 has a pair of diametrically opposed longitudinal bores-254 (oneof which is shown in FIG.
  • the die and punch assembly 200 further comprises a core rod support 258 of a cylindricalshape.
  • the core rod support 258 is provided with a central, partially threaded aperture 260 in which "a core rod insert-. 262 threadedly.
  • the core rod support 258 is also provided with a pair of diametrically opposed longitudinal bores 265 ':(one of which isshowninFIG. 10), which are .radially spaced from the axis 220 by the same distances .as'the die plate bores 225.
  • Core rod support. 258- is positioned ata selected distance below the die bushing 222: by means of a sliding engagement between the bores-265-and the support posts 232 and 234.
  • a pair. of. threaded. passages (one of which. is shown at 268 in FIG. 10) radially-extends from the outer periphery of the core rod support 258 and terminate at the longitudinal bores265, the threaded bores 268 accommodating set screws 270.
  • Thecylindrically shaped core rod sup ort zss may be adjusted up and down on the support post's23'2fand 234 at a selected distance from the lower surface of the die bushing 222 and locked in' place by fifieans of thexset screws'270.
  • the inner punch 240 hasalongitudinalbore 272 clo'sely fitting the outerldiameterofa corelrod 274 which is disposed within the innei punch longitudinal bore 272 for relative sliding; movement, such 'thatft'he inner punch '240 slidablyguided' over the .corei odj274 and the inner punch 240 is fr 'e I and dowumove;
  • the 'core' rod 274 is'fixedly ouritedinto the upper uni threaded portion ofdthe core rod support aperture 260 byany suitable adhesive, with thelow erfend ofthejcore rod in abutment with .the core rod insert'jlfil Initial ad justrnent 6f the insert 262 with respect to h'e'upper sur face of the core rod support 258 axially juststhepqsi tionof the" core” rod 274' so that the; 'per end of the core rod 274 may be flush with"the"i1 per 'siir face221 of-tlie die bushing 222. "j With reference to FIGS.
  • the lowerpunch support 249 is shown' 'as being directly coupled to an ac tuating 'stem" 27 6 byrnea 'ns of a plate member.278 and a pair of threaded fasteners 2801
  • the plate member 278 has a pair of diametricallyioppQsed bores. -279 (FIG. ;1 which slidablyerigagethe' posts 232 and .234 toguide the plate member 27.8 during,reciprocal movement... thereof.
  • a sleeve member 288 surrounds each fastener 280 with-the upper and lower surfaces of each sleeve member 288 being respectively" in abutment with the lower surfaces of the lower punch support 244 and the. upper surfacejof the plate member 278'.”Thus, as the faste ners 280Qare threaded into the ,lowerpiinch support @249,-.,tl 1e .punch support249, and the plate member 278 are fixedlysecuredto one another and reciprocate as a unit under the reciprocating motion of theactuating stem 276.
  • the actuating stern 2 76 isattached to a centrally disposed bore 290 within the plate member 278 by any suitable means such as the adhesive Loctite.
  • Bores 291 (FIG. 10) disposed in the lower punch support 249 slidably receive the outer periphery of the sleevemembers 288.
  • the fasteners 280 are angularly displaced from the support posts 232 and 234.
  • the plate member 278 is provided with diametrically opposed threaded bores 294 (FIGS. 7 and 9) which are angularly. spaced from the support posts 232 and 234.
  • Threaded adjustable abutment members 296, one of which is illustrated in FIGS. 7 and 9, are threaded into the bores 294 and extend axially upwardly through enlarged bores 298 and 300 respectively formed in the core rod support 258 and the lower punch support 249.
  • the abutment members 296 are adapted to abut the lower surface of the upper punch support 248 when the actuating stem 276 moves the plate member 278 in an upwardly direction to thereby cause movement of the outer punch 242 into the die.
  • bushing bore 224 as shown in FIG. 9.
  • the upper punch support 248 also has diametrically opposed .threaded bores 302 each of which threadedly receives a second mechanical abutment member 304.
  • the mechanical abutment members 304 extend axially downwardly from the upper support member 248 and through diametrically. opposed bores 306, 308 and 310, respectively, foundin the lower punch support 249, the core rod support 258 and the plate member 278.
  • Each abut-v ment member 304 has an enlarged end portion 312 which is adapted. to abut the lower surface of the plate member 278/(as shown in FIG. 7) when the actuating stem 276. -is .moved downwardly so as to impart a corresponding downwardmo-vement of the outer punch 242 and withdraw the outer punch 242 downwardly in the die bushing bore .224. 1
  • a spring- 314 is disposed around each abutment member 312 with the opposite ends respectively in abutment with the underside of the upperpunch support 248 and the upper surface of the plate member 278 to bias the two components away from each other. and to maintain theupper. punch support 248 in a predetermined position rel-afiVfi to. the-die bushing bore 224 and the platemember 2 7 8. ;when,the die and punch assembly is in the filled position i-llustrated in FIG. 7 'mAs hereinbefore mentioned, a typical compacting cycle includescaapowder filling step, a-compacting step and an ejection stepgwAs-showni in FIG.
  • the filling step comprises :positioning a hopper 316:over the die plate 212 completely encompassingthe die bushing 222 to fill-the diecavit-y-e256. defined-by the die cavity bore 224 and upper'ends of the inneniand outer punches.
  • the punches areslightly displaceddownwardly' under the action of the aotuating;,stem 276. to insure a complete filling of the die cavity .1256. ,After, the filling step and with, the punches positioned asshown in FIG..
  • the hopper 316 is removed, by ,means'not shown, and the upper surface 221 of the-die bushing 222 is wiped clean of any excess powder.
  • an anvil 318 is transferred over thefilled diecavity 256 and clamped into position.
  • the upperends 320 -(FIG.-'7) of the abutment members 296 carried by the plate member 278 are normally displaced below the lower surface of the upper punch support 248 by a predetermined distance, which is dependent upon the amount of compaction desired. Initially, when the act-natingstem .276 .is.
  • the compacting pressure is relieved by a slight downward movement of the punches and the anvil 318 is removed from over the die cavity 256.
  • the inner and outer punches 240 and 242 are then preferably displaced upwardly so that they eject the finished article 322 which may be picked up by any suitable means such as the vacuum pick-up described in the aforementioned patents, and removed from the die cavity 256 to be deposited in any suitable container.
  • the actuating stem 27 6 moves downwardly withdrawing only the inner punches 242 downwardly in the die bushing bore 224, while the bias of the springs 3-14 maintains the inner punch 240 in upward position with respect to the die bushing bore 256 until the lower ends 312 of the abutment members 304 carried by the upper punch support 248 are engaged by the lower surface of the plate member 278, as shown in FIG. 7, at which time both the upper and lower punches 240 and 242 move downwardly together as a unit to the fill position, wherein the compacting cycle may be repeated.
  • the present invention provides a die and punch assembly having an improved arrangement for a die and punch assembly for producing shaped articles, such as cup-shaped and flanged button-shaped articles, from a powdered material.
  • a die plate having at least one die cavity, means for dispensing a powdered material into said die cavity, an upper and a lower compacting means adapted to be aligned with said die cavity and disposed for relative movement toward and away from each other to compact said powdered material within said die cavity
  • said lower compacting means comprising an outer punch and an inner punch slidingly arranged one within the other for extension into said die cavity, first support means spaced below said die cavity and supporting said outer punch for movement within said die cavity, second support means spaced below said first support means and supporting said inner punch for movement within said outer punch, actuating means operatively coupled to one of said support means to impart a recprocating motion thereto, said actuating means having first adjustable abutment means engaging the other of said support means to move both of said support means in a first direction together as a unit after said actuating means moves said one support means in said first direction for a distance depending from the adjustment of said first abut
  • actuating means is disposed below said second support means, and further comprising resilient means provided between said actuating means and said other support means to maintain said other support means in position relative to said actuating means when said other support means is not engaged by said abutment means carried by said actu- 3.
  • silient means comprises a spring disposed between said actuating means and said other support means.
  • the apparatus defined in claim 1 further comprising at least one core rod disposed in said inner punch for the provision of at least one core hole in said compacted article.
  • the apparatus defined in claim 1 further comprising a longitudinal bore extending in said inner punch from one end to the other end thereof, a core rod slidably and snuggly disposed within said punch longitudinal bore and having an end projecting through the lower end of said inner punch and said second support means; a core rod support positioned between said second support means and said actuating means and having means for mounting the lower end of said core rod on said core rod support for axial alignment with said inner punch bore.
  • An apparatus for making a compacted powdered article comprising: a die plate having at least one die cavity, means for dispensing a powdered material into said die cavity, an upper and a lower compacting means adapted to be aligned with said die cavity and disposed for relative movement toward and away from each other to compact said powdered material into a finished article within said die cavity, post means carried by said die plate and extending downwardly therefrom, said lower compacting means comprising an outer punch and an inner punch slidingly arranged one within the other for telescopic extension into said die cavity, a first punch support spaced below said die cavity and connected to said outer punch and engaging said post means for reciprocating movementrelative to said die cavity, a second punch support spaced below said first punch support and connected to said inner punch and engaging said post means for reciprocatin'g movement relative to said die cavity, reciprocating means positioned below said second punch support and operatively connected to said first punch support for reciprocating said first punch support relative to said die cavity, said reciprocating means having an adjustable abut
  • the apparatus defined in claim 9 further comprising a longitudinal bore extending in said inner punch from one end to the other end thereof, a core rod slidably and snuggly disposed within said inner punch longitudinal bore and having an end projecting through the lower end of said inner punch and said second punch support, a core rod support fixedly mounted to said post means below said second punch support and above said reciprocating means and having means for mounting said core rod on 13 said core rod support for axial alignment with said inner punch bore.
  • An apparatus for making a compacted powdered article comprising: a die plate having at least one die cavity, means for dispensing a powdered material into said die cavity, an upper and lower compacting means adapted to be aligned with said die cavity and disposed for relative movement toward and away from each other to compact said powdered material into a finished article within said die cavity, post means carried by said die plate and extending downwardly therefrom, said lower compacting means comprising: an outer punch and an inner punch slidingly arranged one Within the other for telescopic extension into said die cavity, a first punch support spaced below said die cavity and connected to said outer punch and engaging said post means for reciprocating movement relative to said die cavity, a second punch support spaced below said first punch support and connected to said inner punch and engaging said post means for reciprocating movement relative to said die cavity, reciprocating means positioned below said second punch support and operatively connected to said second punch support for reciprocating said second support relative to said die cavity, said reciprocating means having an adjustable abutment member for engaging said first punch support

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
US109375A 1971-01-25 1971-01-25 Die and punch assembly for compacting powder material Expired - Lifetime US3671157A (en)

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US10937571A 1971-01-25 1971-01-25

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US (1) US3671157A (de)
JP (1) JPS534269A (de)
BE (1) BE778372R (de)
CA (1) CA965918A (de)
DE (1) DE2202753A1 (de)
FR (1) FR2124819A6 (de)
IT (1) IT948301B (de)
NL (1) NL7201021A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733154A (en) * 1971-08-17 1973-05-15 Wolverine Pentronix Deflection compensation system for press
US3741697A (en) * 1972-02-02 1973-06-26 Wolverine Pentronix Remote control system for powder compacting presses
US3999922A (en) * 1975-04-16 1976-12-28 Yasuo Shimada Rotary tableting machine
US4053267A (en) * 1976-10-22 1977-10-11 Wolverine Aluminum Corporation Die and punch assembly for compacting powder material
US4153399A (en) * 1977-09-08 1979-05-08 Ptx-Pentronix, Inc. Multiple punch tool set for powder compacting press
US4450127A (en) * 1982-02-23 1984-05-22 Ptx Pentronix, Inc. Method for compacting powder material with adjustable die and punch assembly
US4456445A (en) * 1982-02-23 1984-06-26 Ptx-Pentronix, Inc. Mounting structure for die, punch and core rod assembly for compacting powder material
US4865789A (en) * 1983-11-14 1989-09-12 Akzo Nv Method for making porous structures
US5326242A (en) * 1990-08-10 1994-07-05 Yoshizuka Seiki Co., Ltd. Powder molding press
US20100239698A1 (en) * 2002-04-11 2010-09-23 Luka Gakovic Refurbished punch tip and method for manufacture and refurbishing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624488A (en) * 1983-12-16 1986-11-25 Hydril Company Tubular connection

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3733154A (en) * 1971-08-17 1973-05-15 Wolverine Pentronix Deflection compensation system for press
US3741697A (en) * 1972-02-02 1973-06-26 Wolverine Pentronix Remote control system for powder compacting presses
US3999922A (en) * 1975-04-16 1976-12-28 Yasuo Shimada Rotary tableting machine
US4053267A (en) * 1976-10-22 1977-10-11 Wolverine Aluminum Corporation Die and punch assembly for compacting powder material
US4153399A (en) * 1977-09-08 1979-05-08 Ptx-Pentronix, Inc. Multiple punch tool set for powder compacting press
US4450127A (en) * 1982-02-23 1984-05-22 Ptx Pentronix, Inc. Method for compacting powder material with adjustable die and punch assembly
US4456445A (en) * 1982-02-23 1984-06-26 Ptx-Pentronix, Inc. Mounting structure for die, punch and core rod assembly for compacting powder material
US4865789A (en) * 1983-11-14 1989-09-12 Akzo Nv Method for making porous structures
US5326242A (en) * 1990-08-10 1994-07-05 Yoshizuka Seiki Co., Ltd. Powder molding press
US20100239698A1 (en) * 2002-04-11 2010-09-23 Luka Gakovic Refurbished punch tip and method for manufacture and refurbishing
US8312612B2 (en) * 2002-04-11 2012-11-20 Blue Sky Vision Partners, Llc Refurbished punch tip and method for manufacture and refurbishing

Also Published As

Publication number Publication date
NL7201021A (de) 1972-07-27
JPS5410741B2 (de) 1979-05-09
DE2202753A1 (de) 1972-08-10
IT948301B (it) 1973-05-30
FR2124819A6 (de) 1972-09-22
BE778372R (fr) 1972-05-16
CA965918A (en) 1975-04-15
JPS534269A (en) 1978-01-14

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