Патент USA US2262338код для вставки
NOV- 11, 1941- R. J. SCHULTZ 2,262,338 DIE CASTING MACHINE Filed July 16, 1941‘ 2 Sheéts-Sheet l 1 2I (Q ' I9 (6 , By ISnDentOr‘ mug/mend} Scym?‘é (99 Q5», Clttorncgs . Nov. 11, 1941. R. J. SCHULTZ 2,262,338 ‘ DIE CASTING MACHINE Filed July 16, 1941 v2 Sheets-Sheet 2 ( 37 ISnnentor .wmb By 2k Sag/1,1217% @L (It-tornegs Patented 11, 1941 ' 2,262,338; UNITED STATES PATENT OFFICE‘ om CASTING MACHINE Raymond J. Schultz, Madison, Wis., assignor to ‘Madison-Kipp Corporation, Madison, Wls., a corporation of Wisconsin Application July 16, 1941, Serial No. 402,656 5 Claims. (Cl. 22-70) This invention relates to die casting machines and particularly to machines of the type in which a ported pressure‘ chamber ‘is submerged in the melting pot in a substantially ?xed position, the molten metal entering the'chamber through the ports and being displaced therefrom into the die et l4. The nipple plate has a socket which re- ‘ ceives the nipple on the pressure chamber and connects it with the sprue in’the die, so that by a plunger which closes the ports at the start . metal displaced from the pressure chamber is dl- - ing any direct relation to the present invention are the die components, generally indicated at 12 and the ?oating nipple plate l3 carried by brack of its displacement stroke. rected into the die. In past constructions, the nozzle or discharge The housing I5 encloses the burner mechanism ‘l end of ‘the pressure chamber has been ?xed and 10 and carries at its upperend the furnace cham ber or muli‘le 16 in which the melting pot is re- ‘ the other end, at opposite sides of the plunger ceived. The top of chamber Hi is closed'except chamber, has been supported by laterally ex for a main aperture of ovoid con?guration, which tending wings which "rest on the margins ‘of the is ?lled by the melting pot I1, and except for the melting'pot and are ‘capable ‘of limited sliding two o?takes If’, H which include tubular exten motion horizontally, but cannot move vertically. sions, as shown The melting pot conforms in plan to the con This construction results in‘occasional fracture of the pressure chamber‘occurring either when the machine isshut down and as the metal in the pot-solidi?es, orlwhen solidi?ed metal in the tour of the opening in the top of chamber l6, so ‘as to ?ll the same. The form of the pot, as pot is being heatedup to melting temperature 20 viewed in elevation is indicated in dotted lines tion just described, in such a manner that the in Figs. 1 and 3. Thus the pot depends into the furnace chamber I6 from a supporting marginal ?ange 2 I. This surrounds the pot, except at the wing supports permit limited‘ yielding both up end adjacent pedestal l I, and rests on a seat sur preparatory to putting the machine into action. The present invention modi?es the construc and down against spring resistance of such char rounlding the pot-opening in the top of cham acter and range as to relieve the destructive ber B. Resting on ?ange 2| is the base ?ange 22 01a ‘ domed cover casting 23 which overlies somewhat more ‘than half of pot IT. This has lugs 24 to stresses caused by thermal ‘expansion and con traction, without impairing the alinement of the plunger, or its functional movements. Horizon tal stresses are relieved‘ by motion at the nozzle 30 support any ‘suitable mechanism (not shown) used to operate the plunger. This mechanism end. . may be hand or power operated and is not direct The design of the spring support is such as to ly involved in the present invention. give the desired high spring resistance and still The portions 25 of ?ange 22 (see Figs. 1 and withstand the high operating temperatures.‘ ' 3) are each thickened and provided with an up A practical adaptation of the invention to a commercial die casting machine is illustrated in the accompanying drawingaln which: Fig.- 1 is a side elevation'of so much of‘ a die casting machine as is necessary to illustrate the invention. . ‘ i ' Fig- 2 is a plan view‘ of the parts shown.in standing boss 26,_ beneath which the lower face is provided with a rectangular notch 21. The notches 21 are‘ above opposite margins of pot’l‘l and are alined with each other, and approxi mately aliried with the plunger chamber 28 ‘of metal forcing unit 29. ' I The metal forcing unit 29 comprises a hollow casting havingan inclined neck 30 with stiffen Fig. 3 is an end elevation, looking to the left relatively to Fig. 1. ' “ ‘ ‘ ' ing‘ web 3|, the neck extending (as viewed in Fig. - Fig. 4 is a view partly in vertical section‘ and 45 1) upward and to the left from the bottom of the upright plunger chamber 28 and terminating in partly in elevation showing how the nozzle end of the pressure chamber is supported and con a nipple 32 which coacts with plate l3.. The fined. plunger chamber is bushed, as indicated at 33, and a discharge‘passage leads from the bottom Fig. 5 is an elevation of the parts shown in Fig. 4, looking to the right relatively to that ?gure. of this chamber through the inclined neck 30 to the port in nipple 32. _ Fig. 6 is a view partly in elevation and partly in Wing brackets 34 extend from opposite sides of section showing the yielding mounting for one of the unit 29. They are alined and approximately the two wings. ‘ centered on chamber 28, and terminate in pads The pedestal ll supports the die mechanism part of which is illustrated. The only parts hav 65 35 which enter and are free in the notches 21. Fig. 1. , . i 2 2,262,338 The brackets 34 are each stiffened by top webs What is claimed is: 35 and by two spaced ?aring bottom webs'3l' ' l. The combination of a plunger; a pressure unit adapted to be submerged in molten metal which shroud the inlet ports 38 (see Fig. 6) through which molten metal enters the plunger and comprising a transverse pressure chamber chamber. The level of molten metal in pot I1 is 5 adapted to receive said plunger and a longitudi kept near the top of the pot so that the ports nal nipple in communication with and remote 38 are submerged. The bottom of plunger 39 rises on its up-stroke from said chamber; and a‘ three point support for said unit, comprising means embracing said nip ple: and permitting longitudinal motion thereof far enough to clear ports 38, and on its down stroke ?rst closes the ports and then displaces 10 as an incident to thermal expansion and con metal from the chamber 28 through the nipple 32 traction, two guides adjacent, and parallel with as is usual in machines of this type. the axis of, said chamber and engaged by por As stated the pads 35 are free in notches 21, tions of said unit, and yielding means serving to but the range of motion is not sufficient to impair center said units in said guides, the yielding the alinement of the plunger. shouldered studs 15 means being of sufficient strength to resist the II are threaded into the tops of pads 35 and reaction of the plunger, and capable of yielding are closely guided in vertical ways drilled through to relieve shrinkage strains. the bosses 26. Fixed to the upper end of‘ studs 2. The combination de?ned in claim 1 in ll are heavy spring elements 42 whose form is which the yielding means comprise heavy arcu clearly shown in the drawings, see particularly 20 ate spring loops, and the guides include limit Figs. 3 and 6. ‘ stops which so limit motion of the unit as to These spring elements comprise a central hub prevent substantial misalinement of the plunger 43 in which the upper end of stud M is fixed and pressure chamber. by a nut and fro looped spring ends which seat 3. In a die casting machine, the combination on portions 25 ‘if ?ange 22 and are ?xedly held of a melting pot; a metal forcing unit at least thereto by nuts on the studs 44. The studs 44 partially submerged in molten metal in said pot, pass through the ends of the springs 42, the said unit having at one end a vertical plunger thickened portionv 25 of ?ange 22 and through chamber and at the other end a horizontally ex ?ange 2!. They are threaded into the top of tending nipple communicating with said cham housing l6. Machine screws 65 further connect 30 ber; clamping means embracing said nipple and ?anges 22 and 2! to the top of chamber Hi. adapted to permit limited horizontal motion; ver In this way a rigid support is provided for the tical guides for said unit adjacent said chamber plunger actuating mechanism, but the chambered and on opposite sides thereof; and yielding means end of the metal forcing unit 29 is permitted very associated with said guides and adequate to sus limited vertical motion up and down from its 35 tain said unit against the stresses occasioned by normal reutral position against heavy resistance normal operation of the machine, but serving to offered by the springs 42. Additional ffictional relieve shrinkage strains. resistance may be imposed by setting up the 4. In a die casting machine, the combination thrust screws 46. These are provided with check of a melting pot; a metal forcing unit at least nuts to preserve their adjustment. 40 partially submerged in molten metal in said pot, The neck portion of the unit 29 is sustained said unit having at one end a vertical plunger immediately behind nozzle 32 in an ori?ce formed chamber and at the other end a horizontally ex partly in the pot i‘! and partly in the dome 23 tending nipple communicating with said cham (see Figs. 4 and 5). The nozzle has an arcuate ber; clamping means embracing said nipple and boss or rib 41 which seals with the pot H. A set adapted to permit limited horizontal motion; ver screw 48 threaded in a boss formed in the dome 23 exerts the desired sealing pressure. The screw 48 is locked by a check nut. tical guides for said unit adjacent said chamber.‘ and on opposite sides thereof; yielding means associated with said guides and adequate to sus The construction is such that the plunger and tain said unit against the stresses occasioned by plunger chamber are held in alinement, but lim 50 normal operation of the machine, but serving to ited vertical motion of the chamber is permitted relieve shrinkage strains; and limit stops associ adjacent the plunger. However. the springs are ated with said guides. so stiff that they do not yield appreciably to the 5. In a die casting machine, the combination stresses imposed by the plunger. Horizontal of a melting pot; a metal forcing unit at least creep is permitted adjacent the nipple. Thus 55 partially submerged in molten metal in said pot, shrink strains are relieved and fracture of the said unit having at one end a transverse plunger unit thereby is avoided, during both heating and chamber and at the other a nipple communicat cooling of the melting pot, ing with said chamber and extending substan While some details of the die casting machine tially at right angles to the axis thereof; sup have been described to indicate the environment 60 porting means adjacent said chamber for guid in which the invention develops its utility, the ing said unit in limited motion in a direction form of the machine is obviously subject to Wide parallel with the axis of said chamber; yielding variation. The details of mounting the pressure sustaining means associated with said guiding unit in any appropriate die casting machine are means; and means for clamping said nipple the real subject of invention and they too are while permitting limited motion in the direction subject to modi?cation within the scope of of the axis thereof. the claims which alone define the scope of the invention. RAYMOND J. SCHULTZ.