US1321470A

US1321470A - of brooklyn

Info

Publication number: US1321470A
Authority: US
Publication date: 1919-11-11
Anticipated expiration: 1936-11-11

Description

C. PACK.

CASHNG PROCESS..

Facntod Nov. H, www

-UNTTED STATES PATENT onrion.`

CHARLES PACK, F BROOKLYN. NEW YORK, ASSIGNOR TO DOEHLER DIE CASTING COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

CASTING PROCESS.

Specification of T 0 all 'whom z't may concern:

A York, have invented certain new and useful Ii'nproveinents in Casting Processes, A of which the following is a specification.

My invention relates to processes involved in casting tubularobjects Which have off- 'set or curved portions such that it would be impossible to castthe saine about cores by the usual methods, and then withdraw the cores. My application, Serial No. 270,917, filed January 13, 1919, discloses and broadly claims such a process, in which the object is cast complete save for an opening, a closure then bein cast in place to'll the opening. In the orin of said invention specifica ly described and claimed in said application, a core, which by the usual practice could not be removed, is allowed to extend out throughthe die or mold, and thus forni .an opening in what should be one of the finished AWalls vof the object,` which opening is subsequently lled by casting a closure in place.

My present invention covers a-niodifica tion of the specific process referred to, in which the offset portion ofthe tubular object is cast'.in place, wholly or partly, in

the second operation, instead of having the offset portion rast complete at the first operation except for an opening through which a straight core extends, as in the speciic process described in lny said application. That is to say, in the present invention the first operation may comprise, for example, casting the .main body' portion and one half of the offset-portion of the object, in the first operation. This may -be done about a core for the inain body portion of the object, which core has an offset portion at its end to. forni the bore of' one half of the offset portion of the object, In this case the main body portion of thc core need not extend through the opening which is left in the casting, but need .extend only to the edge of' the opening, and after the nietal has beenxoast the core may be drawn through the opening in the axial direction of the niain portion of the core. Or a core may be used for the main portion of the casting,

which core may extend through the open- Letters 1atent., Patented Nov. 11, 191).

Application filed May 14, 1919. Serial No. 296,972.

ing, in order that it may he grasped to with-` draw the same, and a sepa-rate core'iused to forni the bore of one half of the offset, which core may be drawn either axially or at right angles to its axis. In either case the edge of the opening which isy left may be treated, i

as by placing a coating of solder thereon,-

'and the remainderof the tubular object cast in place against the treated edges, so as i to make an integral structure with the original casting.

It is preferable, in this invention, that the offset portioniof the'object should be'cast to itscenter line in the first operation, and the remainder in the second operation. It is only essential, however, that such arrangements be made .that all cores used in Ab oth operations may be withdrawn Without injuring the casting, and that the part of' the l casting lnade last may be vcast againstthe treated edge of-the part of the casting made first. In any case, a much better Joint 1s made, when the second casting 1s cast against the edge .of the first casting, than is possible when 'separately-made castings` are merely soldered together at their abutting edges, in which case the joint is necessarily. iin# perfect.

The process described herein permits interior offsets or irregular surfaces to be formed -within the closed end portion and \\'itl1in tlie offset portion of the casting, which cannot be formed-- when a single straight core extends through an opening in auend wa'll, and a separate core extends into the offset, as in thespecific process described in my said application, which cores nlust be withdrawnaxially at the end of the first operation. Also when a core pin with an. offset portion is used, or when the core pin for the offset portion of the` casting is to be withdrawn at right angles to its own axis, a curved surface may -be formed in the 4casting at the angle between the niain portion and the offset portion of? the core, by providing a suitable curved surface on the core pin or pins at this point.

In order that a clearer understanding of iny invention niay be had, attention is hereby directed to the accompanying drawings forming part of' this application and illustrating certain ways in which in invention may be carried out. In the rawings Figure 1 is a plan View of a die showing what may be termed atone arm in process of formation therein. in cross see, I tion. with three core pins in position; Fig. 2 is a cross section taken on line 2 2 of Fig. l; Fig. 3 is a partial plan View of the tone aria shown in Fig. 1; Figs. Jr and 5 are plan views showing further steps in the process; Fig. G is a front eleva-tion partly in cross section of the completed object foi-ined in the preceding figures; and Fig. T is a partial plan view similar to Figfl showing a modified arrangement of core pins.

Referring to the drawings l have indicated the cast-'ing of' a. hollow tubular arm having a iiiain tapering' horizontal portion l and a pair of

end portions

2 and 3 which 'are offset at right angles from the portion 1. Obviously, if it were attempted to Cast this object as an integral construction about three cores, in one operation, .it would be impossible to withdraw the core about which the portion 1 was cast. Inaccordaiice with iiiy invention acore 4 may be used, as issliown in Fig; 1, to form the main portion 1 of the tone arm or tubular object to be cast, this core extending out of the die, 5 to the left. A straight core 6 -is usedto form the end portion 3 of the tone arm in the usual' way. A core 7 is used to form one half of the end portion 2 of the toife arni, this core pin having an operative portion 7 adapted to abut against the core pin 4 and to form what. Linay terni the inner one halt' of the offset portion 2' ofthe tone arm.

The cores being properly positioned in the 'mold cavities of the die, thenietal is poured, with the result that the offset portion 3 is formed, all ofthe main portion 1 is formed except its end closure to the left,'referring to Fig. l, and the inner or right hand one half of the offset portion 2 is formed. The metal having been poured the cores are with# drawn, the. core 4 being withdrawn axially to the left and the core 7 being withdrawn either axally,'or at right angles to its axis in the same direction as the core 4, which may be desirable if offsets or irregularities are to he formed within the offset portion2 of the tone ai'iii which \\'oiild.1iot' permit/tho core pin 7 being drawn axially.

ln the niodifieationshown in Fig.. 7 tlie core pin #1 is used in pla'ee of the corepin 4 just described, core pin 4 having an offset portion 7a integral therewith which takes the place ofthe core pin 7 shown in Fig. 1.' lVitli this construction the core 4 need not, but may, extend to flie left. beyond the edge of the opening` and the core pin 4 wit-li its offset portion T is \\'ithdrawn in the axial direction of the. portiontl thereof.

The'edges of the opening S. 8, indicated in dotted lines ii. Fig. l. are now given a light coating with a molten soldering or tin ning mixture and the obiect'is placed in ari other die 5 with another core 9 inserted in the end 2 of the object. This core 9 has itsl end and peripheral surfaces suitably formed to press against the portions2 and l ofthe tone arm which have already been cast, and to form the interior surfaces ofthe end closure of the part 1 and the remaining portion of the offset 2. The die 5 being suitably gated as is shown at 5, moltenv metal is tiren poured therein against the end and peripheral portions of the core pin 9 to a sufiicient extent to fill the mold cavity 10 and thereby forni tlie portions of the casting which re vmained l-to be formed. In Fig. 4 the parts are shown before the metal has been cast in the die 5', and in Fig. 5. the parts are shown after .thejmetal has been cast, in which it will be seen that the metal 2 which has filled the mold cavity 10 completes the offset portion 2 of the casting and the end closure for the portion 1, and makes an integral construction with the portion of the ci'isting originally made. When the metal has sufficiently solidified the core pin 9 is withdrawn axially. It is preferable to have the joint between'tlie old and new portions of the offset 2 extend along the center line of the portion 2 as indicated, because t-he joint will thereby be.

formed in comparatively straight.v surfaces.

It will be 'obvious that a more complex structure may be formed by the application of tliesame principles. For example, if the offset'2` sliouldbe given an extension at an angle tothe portion A2 shown/in the d rawings, the'core pint) alone would not suffice aoly ssi

in carrying ont the second part of the process, -an additional core pin being'reqiiired to form the angulai'ly extended part referred to, after which another core pin might have to he inserted within thebo're'of the extension referred to and molten metal poured about its end to fill4 the :opening through which lcore pin 9 was withdrawn'.

With the arrangement describda curved surface, or surface of desired configuration, I

may be.V )rovided in tlie'objeift cast at the Junction etween the portion 4 and the por tion 7n of the wre pin. Such a curved surv face is shown at 11 in Fig, 7, as 4cast against a suitably shaped portion of. the con: pin.

Obviously such' a surface can not he formed by the ilse of separate core pins such4 as those shown at L and 7 when the c ore pintor theoffset portion of the casting must lie drawn in the, direction of its' ownL axis. Such a construction is possible, however, when'thecoi'e pin 7 may lie withdrawn in the axial directionA of core pin 4. y

What I claim is:--I

1. A method of'easting a tubular object having a straiglitportion closed at the end and an offset poi-tion adjacent such end, co'n'- sisting in casting such an object complete save for the end closure and part of tlie'otl'- p0 tions snel then casting into )lace tlief @mi classy@ and ,set pitin. i n

n'ifstlwd sl" tasting a tubular object stsglit portion closedv :it the end ortion ncljaent such end, con* Ming stiel), :m object complete t @nfl closure and part of the oil'- r pmtiwm t'esting 'the edges of the openthus lait, and than casting into place the mmzinng part 0 5 the olfln instliol of casting a tubular object ai 'straight portion closed :Lt-the @ncl 5 :mu un offset pmtion adjacent such end, consistifg in casting a portion of sQli object s .bent scare or cores adapted to be Withdrawn in straight lines, withdrawing such C01@ 0l cores, and then casting' into place the lsinaidr 'of the obg'eet, including the end Glasur@ and more or less of ther oll'sot portion, about a Core 01' cores adapted tu bo withdrawn in sti-:iight lines.

'ls imetllofl 0i: casting' n tubulaihaving' :L straight portion closed :it the 'und and :in offset portion mljmcnt such vnd, consisting in castingthe straight poi-tion nml one halt the diznnetei' 0f the otlset poi-tion of such object about a core o1' cores adapted t0 be Withdrawn in straight lines, fitlnlxznving such core 01' cores, placing molten metal on the edges 0l the opening tlins'lc'ft, and than casting into place about n cure 01' Cores adapted t0 be withdrawn in straight lines theI remainder of the object.

This specification signed nml witnessed this 12th (lay of May, 1919.

l f CHARLES PACK. Witness:

` VILLIAM R. AHRBERG.

object