US1820235A - Briquetting machine - Google Patents

Description

Aug. 25, 1931. J. c. LEMMING ETAL' I ,235 i A 40 as Aug. 25, 1931. J, c. LEMMING ETAL v 1,820,235

' BRIQUETTING MACHINE Q M N l- I I I 1/ I f i M///////// M //j Aug. 25, 1931. J. c. LEMMING ET AL 1,820,235

' BRIQUETTING MACHINE Filed Feb. 15, 1929 4 Sheets-Sheet :5

. anon Lieu I I? e K 2% I 3 m M aktozmqs Aug 25, 1931. J. C. LEM.MING ET AL 1,820,235

BRIQUETTING MACHINE Filed Feb. 15, 1929 4 Sheets-Sheet 4 glwuwtou 442.1% M

l s e of finely divided copper, tin and graphiteoreon? CLLE MM NIG Ann ALBEBTfHQ vAnEn'rInii,"onnAY'romonIo,

Patented 7 Aug; 25, 193

'assrnons'ro T E 4 i BR'IQ ETTINQ ma i g I I "Applicat on a mum 15,1929; Serial mam This invention relates to a briquetting ap} V paratus for highly:- rcompressingpowdered metals or other finely divided materials'into the form of ajbushingjhavin two portions of different diameters suoh5 f or'instanceaas a bushing. having a radi'al external flange at one end thereof." 7

vPatent No. 1,679,408 to l ljavis al.,

August 7 1928-,1d-iscloses an apparatus for brlquetting such bushings from a material various other similar mixtures; In using this patented apparatus, difficulty has been ex perienced in maintaining to exact dimension the thickness of the flange portion ofthe bushing. -QY This difliculty arises due to the'fact that-if there isa slight variation in the quantity or compressibility of the powdered-material vput into ztheymolding die a cavity, the distance the larger ram will travel into: the

larger; bore of said cavity will "varyto a cor} responding extent and hence thefiange thickg I raised position} until the upper; ram has ness of thej briquetted bushing will vary acorrespondingly, a

' ,Now, the, objectof this invention tie vide a briquetting apparatus whichwill overcome the above described difficulty as well as to provide a simple and morepositive mechanism, in general 'fOI' briquettin'g;flbushings similar to gthat' described in: said patent. Y

Eurther .,objects and ,advantagespf the present invention will be apparent from the following description, referencejbeing had to -In the drawings:

the, accompanying drawings,- wherein a preerred embodiment of 0116 2 91 Qf P1 5? ent invention, is clearly shown;

Fig. '1 is a vertical:sectionv molding die cavity" and illustrates the. rela- .tive positions ofthenpp'er or largerram, the molding die, andv the lower or; smaller r'am at the beginning of the briquetting operation F1g.,. 2 71s a sim lar vert cal; sect on, and

illustrates the; relative positions of the parts when the material being, briqu'etted is under I 7 highest compressiomthat is,' at? the end of the down-stroke of the upper ram and before thelower ram has started to rise. 1

F'g. 3-illustratesthe relative pos tion of the; parts after both the upper and" lower the upper ram.

reciprocating rams have:

started their up-strokes; the [die being carried up to itsinitial position byi the up-mov'ement of the lower ram,

Fig, 4 illustrates therelative positionvof the partsiwhen'both upper and lower rams are at the top of their strokes, thedie being in its normal; or raised, position, and the briquetted bushing having been e'j ected from the mold cavityby thelower ram. 1 I Fig. 5 is:a side views of the main portion sectionon' line5-r5 of Fig; 6.

Fig. 6 is a frontend view of the machine moved," but shows a portion in] section to il-' vlustrate' the -bolt mechanism f orpositively holding the die table in its normal orraised position for a porti0n ofthe down-strokeof "Figlj 'Z s a detail; section on line of.

L nisin for -positively' holding the die table in reached a predetermined position inthe cavity 1 tionary on lyfduringtheinitial part ofthe v down-stroke ofthe .upper tubular ram 26 e0 of theLma Chine, this view being rtly-1n H 0 6 further illustr'atingjthe bolt'mecha- I Similar referencecharacters refer to sima is i'i'larr parts throughout the several views" of the'drawings' f .a Referring to'Ff gs. "1 to 4, n umeral- 20 desigi-' nates the molding die having a larger bore ar die when whichis 1161a, staandfisj'movabl'e therewithior the latter part i A stationary Isolidrod vor mandrel 2'2 liked land vhence forms the molding cavity 30 lying betweejn the" bores 2l and 22, the rod 27, and the'upper and lower tubular rams.

"26 an d 28 respectively; The lower vtubular gRam28 is solidly fixed to a loffsaid down-stroke, as will be clearlydee scribed hereafter; f

ram '28 is shownat its lowest Ipositionin t Figs.- 1; and 2.

head 29 having a large screw threaded shank 31. Shanlr3l has two; large I nuts 32 and 33 fixed in spaced relation thereupon. The lower nut 33 has a depending skirt 34: which 1s sultably guided 111 its vertical reciprocation by the guide bearing 35 which is a stationary part of the machine. The opposed faces 36 and 3-7 of the spaced nuts and83 respectively form cam sur faces which are engaged by the bifurcated lever l0, which upon being actuated as hereinafter described will vertically reciprocate ture through the large screws 31 and a snug sliding fit within the tubular rams 28 and 26.

The operation oi? the parts shown in Figs. 1 to 4 will now be described. When the parts are in position as shown in Fig. 1, the molding cavity 30 is filled level full with the comininuted mixture of metals and other ingredients which are used to form the briquetted bushing. Then while, the die table 24; and the lower ram 28 remain stationary and are solidly supported, the upper ram 26 is caused to descend until its lower end enters bore 21 of the die cavity to an exactly predetermined desired distance and so compresses the material within the bore 21 to form a flange on the bushing of the exact predetermined thickness desired At this point in the down-stroke of ram 26, a stop 51 fixed to the head 53 of ram 26 strikes an adjustable stop 52 fixed to the die table 25 and then further down-movement of ram 26 carries the entire table 25 together with the die 20 rigid therewith downward while the lower ram 28 still remains stationary. This movement of course maintains the flange 50 of the bushing being formed at a constant predetermined thickness while the material-in the lower portion of the mold cavity is being highlycompressed by the relative movement of the die 20-and ram 26 to the lower ram 28 (see Fig. 2). The dietable 25 is solidly supported against down-movement by two opposed laterally movable bolts 10 (see Fig. 6) substantially up to thetiime when stop 51 engages stop 52. At this point the two bolts 10 are quickly withdrawn from engagement with table 25 by mechanism hereinafter described, whereupon table 25 is free to be forced down by thefurther down-movement of the ram 26 and its stop 51 fixed therewith.

Thus the molding powdered material introduced into the cavity 30 will be compressed into a briquette having the form indicated at 55 in Fig. 2. The height'oit the briquetted bushing 55 will be about one-third of the height of the cavity 30 as shown in Fig. 1. The exact thickness of flange 50 thereof will of course be determined by the position of bushing 55, but it will not cause any variation in the dimensions thereof since the thickness of flange 50 is determined by the engagen'ient'of stops 51 and 52 as above described and since the total length of the bushing is determined by the length of the stroke of the upper ram and the predetermined bottom position of the lower ram 28. The bottom position of the lower ram 28 may be adjusted exactly as desired by screwing the large nut 33 up or down on the large screw 81. The shoulder 38 on nut 33 rests upon the top of the fixed guide bearing to solidly support the lower ram in its bottom position (see Figs. 1 and 2). Of course the bottom position of bifurcated lever 40 must be adjusted to correspond to that of the lower nut and also the position of the upper nut 32 must be correspondingly adjusted for the proper spacing between the faces 36 and 37 of nuts and 33.

Now aftercompletion of the down-stroke of the upper ram head 53 as above described, 2 it immediately moves up withdrawing the upper ram 26 from the bore 21 and the stop 51 from engagement with stop 52 in the die table 25, and simultaneously the'lever 40 is actuated to raise the large screw 31 and lower ram head 29. (See Fig. When the lower ram 28 is thus raised it bears upon the bottom of bushing 55, and since bushing 55 is ordinarily very tight within the cavity in die 20,the-entire table 25 will be raised to its normal top position thereby. When table 25 strikes suitable fixed stops 56 (see Fig. 6) at its top position, the further up movement of ram 28 will eject the briquetted bushing 55 from the die cavity 30 and beyond the upper end of the central stationary rod 27. See Fig. 4). F rom'this position bushing 55 n1ay be easily pushed laterally from the machine by the cavity filling funnel member 57"(see Fig. 5) which moves across the top face of table 25 after each molding op eration toregister with and refill the cavity 30 with powdered material for the next operation. After ejecting the bushing 55, the

lower ram 28 is returned to the position shown in Fig. 1 by the bifurcated lever 40. During down-movement of ram 28 the' die table 25 is maintained locked in its top position by the inward movement of the lateral bolts 10 as shown in Fig. 6 by actuating mechi reedse 'anisinhereina'fter a sented; The briduetted.

bushin s 55, are "subseqii'ehtly sintered in: a f

non-'oxldi'z ing atmosphereand 'efurtlier treated to provide "suitable bearing bushings whicheabseqaem absentee; however,-Ifo'rms no part of this present invention; but one such" process 1 is 1 disclosed jPate'nt No; 7 1,556,65811THETEY Williams, issued Oct. 13'; 1.925

1 l'r 1'; 1 r; n v

, Oneform of machine for supporting and I operatingtheparts heretoforeldescr-ibed will crank m 651s eonnetedatt cross-head sv a hi l d se base h h supports "a f vertically extending frame 61 providing bearings 62 and 63 firep wer riven Y shaft T64" "carrying a: crank pin 65.

l pin 66 by means incl din -a connectifig'rod in Fig.

ylaterally reciprocatable racks-"17 which are short distance apart and both inithe path of" 1 the tapered cam'18 (see Fig.5) at the lower laterally in opposite directions, thus caus direction as to quickly withdraw thebolts 1O 7 I y from the sockets 12 in die ta-ble 25. V The time 67 ;'An adjustable eccentric, bushing 68 con-'- nects the connecting :rod' "67 with crank pin 65. aThe pin 66 has a bearing'within a cross head 69 slidable between the crosshe ad guides- 70 and 71 supported bygthe mainframe 61.

The lower end of the crosshead 69'supports' a socket member 72 for receiving the upper tubular ram 26 which is fixed 'in position by a set screw 73. The abutment 'stop'51 is rigidly fixed to member 72 as clearlyshown The die'table 25" is guided in its vertical movement by the lateral guides 75 which are supported upon the main frametl. Each of the lateral guides 75 has mounted therein. a spring pressed locking plunger or bolt whose inner tapered end 11- fits very snugly into a corresponding tapered recess 12 in the side of the die table 25 when said die table; is in its top position, as. shown in Fig. 6;

The two bolts 10 are urged inwardly by the small coil compression springs 13. The'bolts I 10 are moved out of engagementwith, table 25 by the small shafts 14 mounted above each ofthe bolts 10 and eachha'ving a smallpinion which engages rack teeth onithe top side of bolts 10 (see Figs. 6 and 7);, .Shafts 14 each have a second pinion "16 fiXed thereon and located in line with and meshing with supported upon suitable guide slots in the stationary frame; 61 directly j back behind the die table 25. These two aligned horizontal racks 17 have their inner endssp'aced only'a end of the vertically reciprocating ;ro d 19 whose upper end is supported at 9; to the cro'sshead 69; When the crosshead- 69 descends, the cam rod 19 "also-descends andthe cam 18 atits lower end engages the inner ends o'fboth the racks'17 and projects-them" ing the two small'shafts 1e to rotate'insuch ofsuch withdrawal of bolts 10 is accurately adjusted i s O to occur in time tol'p'er- V mit the down-movement of'd-ie table upon 1 theen gag'ement' of'stops 51- with the stop'52 as described above; After table u-"25 star-ts moving up and cam 18; has :clearedthe inner cam ends of racks '17, the-two'b'olt's '10 are e r urged by the coil springs 18 aga'instthemoving .sides of the table- 25{and 'so snap into we I 2 their recesses 12 as soon as they rcg ister there with and so solidly" supportktable 25 in' its .75 r top'positionuntil the next'oyol'e ofoperation: v "The lever is actuatedtomove' z above f f described by-a driven cam 891having agroove which receives 1 a. roller 9 1- attached to ta bell crank lever 92 which. is pivoted M293 cam snrfaces scan-(1 37.

" fMe'tallic powders I are ntroducediintd upon frame 61. *The'levers 92and 40are connected by a link-94 including a turnbucklex95 V to permit'fofitheproper adjustment ofithef bifurcatedendof lever LOowith-respectitothe w v molding cavity 30through a 1 funnelmember apa'ssage :81 therein and is swung about pivot fiXedpivot ontheframe 61'- at'121,jand a link 124 in such, a manner that the lowerendof 7' the passage 81- will be brou'ghtrintoregistrar tion with the die cavity 30 and' thenthe enti're member=571willbe given several rapid-lateral i shakes'by the shape of the earn 122 in order V 79 and the "funnel passage 81 will be dis charged to "fill the die 'cavity 30 "level full as "that'themolding powder within the hopper 'shown fin' Fig.- 1. "Then member 57 is swung about pivot pin 80 to clearthepath or travel J v of the upper {ram 26' as stated above. During v the swinging, movement ofmernberi into registration with the cavity 30, the side-sure face of member 57' will engage-thejpreviously located receptacle.

tion shown Tin; Fi'gfl and shoveit laterally across the'itop' of'die table 251-int'o a suitably f y r ntheiabo ve descriptionof the" operation.

'offthe' mainl'parts' of this apparatus fit was 1 stated that ordinarily*ithe iupdnovement of the lower ram 28 raised the dietable 25 was top positionfhy its forcel'against' the-bottom of'the briqu etted bushingp55 which is at'tliat I 1 time p essed tightly withinithe die cavity a v If; thisfrictional f' hold otbushingi '55 u'po'n thelfdie is"insuflicienttoraise the die table'25, 5 or ifthe machine is operated withoutjfilling the die'cavitywith material; the top sur' win engage" easi g on the; bottbin; i of the die table 25 andthus: lifttheldi'e table as (as shown in Fig; 4-)" where 'i30 it will be retained by the inward movement of the lateral bolts -as hereinahove described. The stop 100 should be so adjusted that dietable will be lifted by the nut 32 exactly to its top position and nofurther,

, since after bolts 10 snap into the tapered re-.

1. Molding apparatus for briquetting flanged end bushing,'comprising: a reciprocatable die having a mold cavity provided by twobores of different diameters, a stationary central mandrel proj ecting through said mold cavity, larger and smaller tubular rams received respectively by the bores at opposite a predetermined distance to form the bushing flange of the desired thickness, stop means movable with said larger ram for actuating said die at said predetermined point of travel, means for withdrawing said larger ram, and causing both to move together toward said smaller ram to completethe briquetting operation,-and means for moving said smaller ram relative to said die to eject the briquetted bushing, A i p 4:. Molding apparatus defined by claim 1, including means to positively hold said die in fixed position until said larger ram has traveled said predetermined distance and to then automatically release said die to permit its movement with said larger ram. I In testimony whereof We hereto afiix ou signatures. V V i JOHN C. LEMMING.

ALBERT I-I. VALENTINE.

ends of said mold cavity and having a sliding fit upon said central mandrel, means for filling said cavity with material, means for forcing said larger ram into said larger bore a predetermined distance to form the bushing fiangeof the desired thickness, means for then holding said larger ram and die in positively fixed relation and causing relative movement thereof with respect to said smaller ram to complete the briquetting operation,

means for withdrawing said larger ram,and means for moving said smaller ram relative to said die to eject the briquetted bushing.

2. Molding apparatus for briquetting a flanged end bushing, comprising: a reciprocatable die having a mold cavity provided by two bores of different diameters, a stationary central mandrel projecting through said mold cavity, larger andsmaller tubular rams received respectively by the bores at opposite ends of said mold cavity and having asliding fit upon said central mandrel, means for filling said cavity with material, means for forcing said largerram into said larger bore a predetermined distance to form the bushing flange of the desired thickness, and stop tuating said die at said predetermined point means movable with said larger ram for acof travel and causing both to movetogether toward said smaller ram to complete the briquettmg operation, and means for ejecting the briquette from the die.

3. Molding apparatus for briquetting a flanged end bushing, comprising: a reciprocatable d1e having a mold cavity provided by two bores of different dlameters, a stationary central mandrel projecting through said mold ,forcing said larger ram into said larger bore

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