US1684715A - Mold - Google Patents

Description

Sept. 18, 1928.

D. J. RYAN MOLD 3 Sheets-Shet Filed April 17, 1925 wve n roz Sept. 18, 1928.

D. J. RYAN MOLD Filed April 17, 1925 3 Sheets-Sheet 2 i H f l -I. 1

(1H0 an M D. J. RYAN- Sept. 18, 1928.

MOLD

3 Sheets-Sheet 3 Filed April 17, 1925 Quorum Patented Sept. 18, 1928.

UNITED STATES DANIEL J'.-RYAN, OF CLEVELAND, OHIO, ASSIGNOR TO THE' CLEVELAND TRUST COM- PATENT OFF-ICE.

PANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

MOLD.

The invention relates to improvements in semi-permanent molds of the character disclosed in my pending application Serial No. 538,457, and which are especially adapted for the casting of aluminum alloy or equivalent metal articles. v

The objects of the present invention include simplifying the construction, reducing 1 the cost of production and rendering easier the operation of molds of the character in question.

A further object of the invention is to produce a mold ofthe character in question that requires only a moderate amount of skill and training on the part of the operator in order to produce castings of uniformly high quality. Other objects more or less ancillary to the foregoing as well as the manner of attaining all of the various objects will appear in the following description 9f the preferred em bodiment of the invention illustrated in the drawings.

of myimproved mold.

Fig. 2 is an end elevation of the same. Fig. 3 is an enlarged sectional. elevation, the section being taken' on the line- 33, Fig. 1. Fig. 4 is a section on the line 4*4, Fig. 1. Fig. 5 is an enlarged plan view of the cast-- ing formed in the mold before the gate metal is detached.

Fig. 6 is a side elevatio of the casting shown in Fig. 5. 3

Fig. 7 is an enlarged fragmentarysection on the line 77, Fig. 3.

Referring in detail to the construction illustrated, the body .of the mold consists essentially of two side members or halves 1 and 2.. The adjacent or abutting faces of the mold halves are formed with registering recesses to provide a casting cavity 3 and a gate cavity designated in its entirety by 4 and comprising a pouring section 5 and an upright iii-gate section 6. The mold halves are fitted with upright extensions 7 and 8 which are recessed to form the upper parts of the pouring section 5 and the in-gate section 6 extend wellabove the top of the mold cavity as is clearly indicated in Fig. 3. The extensions 7, 8 have the upper end of their cavity flared at 7 to afford a suitable pistons or other cup-shaped.

In the drawings, Fig. 1 is a side elevationare additionally tapered radially toward of the gate. These upper partsof the gate.

pouring mouth for the gate. The'in-g'ate section 6 of ity of the mold from the bottom thereof to substantially thetop thereof through a narrow passage 9 (Figs. 4 and 7). Preferably, however, this passage 9 is somewhat Wider near the bottom, as is indicated in Fig. 3 and by the casting as shown in Fig. 6. It will be noted that the pouring section '5 of the gate extends downward and. laterally and thence upwardly,'after the manner of the well-known horn gate, into the bottom of the ln-gate cavity 6. K

The bottom wall. of the casting cavity of the mold is formed by an upstanding cylindrical block 10 (Fig. The block 10 is mounted on a cross plate 11 which in turn is carried by any suitable support such as the frame 12, made of steel angles or other suitable forms bolted or riveted together. The block 10 is preferably formed'with a central depression 10 to provide a turning boss on the head of the pistoncasting.

The core of the mold as shown is formed of reinforced green sand and is of the same character as the core described in my companion application Serial No. 23,812, to

which reference may be had for a detailed description of the preferred method of making the core. The core, which is designated in its entirety by 13, comprises the main body part 14 of fine green molding sand and areinforcing structure which consists of a-ciroular and preferably annular core print section 15 formed with an integral cross bar 15*, and a section completely embedded in the sand consisting of a rod or stem 16 which has its upper threaded end secured in an aperture in the cross bar 15 by means of a wing nut 17. The lower end of the stem 16 is split, preferably into quarters 16 which are opened up or spread apart as clearly indicated in Fig. 3. Preferably these spreading branches or fingers 16 in addition to their inward taper their lower ends as best shown in Fig. 3.

The core print section 15 of the core is designed to rest upon the top surfaces of the mold halves adjacent the mouth of the casting cavity and is definitely and accurately located relative to the casting cavity by diametrically opposite notches 15, 15', which en age with correspondingly shaped lugs 18 on the mold halves. The sand body of the core is preferably provided with a number of vertically extending vent passages 14 to facilitate free escape of vapors and gases through the core body when the molten metal enters the mold.

, tensions 7 and 8, and the cylindrical block 10 are preferably formed of cast iron which can readily be machined and worked tothe desired forms- The mold halves 1 and 2: are

preferably formed with top .and bottom close t anges 1*, 1 and 2, 2", and also. with vertical strengthening ribs 1,--2.; In the preferred construction illustrated the mold halves are slidably mounted on the supporting frame and mechanism is provided for moving the two halves from and toward each other. On the two ends of the main sup orting frame 12 are mounted rectangular fiame castings 21 and 22 and these end castings are connected a pair of roundtop bars 23, 23' and a sunli' ar pair of bottom bars 24, 24. The mold halves are formed with apertures through which these two sets of bars pass asshown in Figs. 1 and 3 and said mold halves are thus slidabl supported on th'bars. To open and he mold apair of shafts'25, 26 are I rotatably mounted in the frame 21 and geared together b pinions 27 27 fast theree 'on. The upper s 'aft is fitted at one end with an actuating lever 28 and both shafts are 'fitted at both ends with crank arms 29, 29. These crank arms arein turn cbnnected by hnks 30, 30 with, the mold half 1. Similarly shafts 31, 32 having intermeshing pini0l18 33, 33, are mounted in the frame 22 and are connected at their ends by means of cranks 34. 34 and links 35, 35 with the other mold half 2. The shaft 31 is fitted with a hand lever 36 to actuate the shafts 31 and 32.

V I prefer to make one of the sets oflinks ad-' justable 'in length and in the construction shown the links 30 are so made.

With the mechanism described the mold n halves can be'o ned and closed very easily and very quic by sim 1yv swinging-the crflnkarms 28 arid 36. Obviously the mold parts should be of such forms and sizes that the mold halges will simultaneousl come into mutual eng ment with each ot er and with the sides E the cylindrical block; 10. Alignment of the parts can readily be effected by adjusting the block 10 for engagement with the mold half 2 and then the hnks 30 a can be' adjusted to insure contact of the faces of the mold'half 1 with the mold half 2 and Y the block 10, it being understood that a slight amount of play provided between the mold the vide 15" ofthe core rint so that it is accurately halves and the guide bars 23, 24 upon which they are supported.

In utilizing the mold for making piston castings .I prefer to core out the wrist pin bosses. For this purpose I slidably mount a pair of core pins 37, 38 in the mold halves 1 and 2 respectively. These pins are provided with handles 37", 38 which can be conveniently grasped by the operator to withdrawthe pins from engagement with the cas ing as soon as the metal freezes following uring. e metal-reinforced green sand core above described can be made in various ways. In my pending application Serial No.

538,457, I have described a method of making such cores by hand and in my companion application Serial No. 23,812, I have disclosed another method of making cores of this character in which the metal reinforced structure is mounted ?the core box and then the sand is introduced y blgwing with commethod because of the great speed and .economy with which the cores can be made. I

will not here describe the latter method in .pressed air. I prefer 'to employ the latter I of forming thecoreand that the core can,

if desired, bemade by'hand. In the latter case it is only necessary to mount the assembled core remforcing structure in the core box, the core print structure 15 resting upon the top of the core box adjacent the cavity thereof and the stem 16 depending cavi upstandin guide means on the core eing prox to engage the notches positioned in re ation to the core box cavity. Then the green sand can be introduced by hand through the core print to fill the core box. Next the vent passages 14" can be formed by forcing a wire or slender rod down into the core in the well known manner. This having been done, the core box can be inverted and the parts-of the box separated to free the core. introducing the sand the downwardly tapering form of the finger 16' facilitates the solid formation of the sand core around the reinforcing structure, it having been found that it is more diflicult to ininto said;

troduce the sand solidily around said structure where the tapering formation is not employed. This is particularly important'too, when the sand cores are blown by compressed each other and with the cylin block 10.-

e mold byswinging able pouring ladle dips the molten metal such as aluminum alloy from the heated hold ing pot and pours the metal into the pouring passage 5 of the mold. The molten metal moves through this passage 5 upward into the bottom of the in-gate cavity 6 of the gate and from this cavity flows gently into the casting cavity ormatrix of the mold. The

pouring is continued until the metal rises to the open top of the in-gate cavity 6, the slight head of metal in said cavity and in the pouring passage 5 serving to insure complete fillin of the casting'cavity proper.

y conducting the metal through the horn shape pouring passage 5 into the bottom of the in-gate cavity 6 and. thence-laterally into the casting cavity proper a gentle fiow of the metal is insured and attrition of the sand core which might otherwise occur is obviated. As

the molten metal enters'and slowly rises in the mold cavity there is ample freedom for the escape of air, vapdrs and gases both through the-porous body of thesand. core and also upward through the open topof the iii-gate cavity 6. Consequently porous cast-. 'ings due to occluded air or. gases are entirely avoided. As soon as the initial solidification of the cured metal occurs, as indicated by the shrlnkage of the metal in the gate, the

from the mold with the operator withdrawsithe core pins 37, 38. Then, after a suflicient further-period to insure thorough setting of the metalof the casting, the mold operator separates the mold sections by swinging one or both of the hand levers 28, 36 whereupon the casting which is still supported upon the cylindrical block 10,

can be lifted from the mold. The green sand core is then readily broken-out of the casting, whereupon the reinforcing structure com prises the metal core print and its depending branched rod becomes available again for use by the core maker.

It will, of course, be understood that the forms and diniensionsof the core and mold body cavity'can be varied to produce pistons or other cup-shaped castings o-fa wide variety of forms. Of course the individual piston casting shown in Figs. 5 and 6 is to be separated from the gate metal by breaking or by 7 means of a saw or other suitable cutting tool; Figs. 5 and 6 show the casting just as it comes gate metal still attached.

Castings made in my improved mold have all of the desirable qualitiesand characteristics of those described in my copending application Serial No. 538,457. Furthermore the mold of my present invention has the advantages of comparatively light weight, ease and rapidity of operation. The metal parts of the mold are capable of being produced at moderate, first cost and the cost of upkeep of the mold is low. In addition, the form of reinforced core employed'being adapted to be made of green molding sand by the economic compressed air blowing process set forth in my companion applicatlon Serial No.

23,812, further increases the economy incident to the use of my improved mold.

It is to beunderstood that whileI have shown the reinforced sand core suspended in :themold cavi y from above by the metal core print, the invention in some of its aspects is not limited to such arrangement, it being possible to arrange the core inother positions so u long as it is supportecf from the mold body by the metal core print, and particularly it is obvious that the core and the mold cavity can be inverted so that the core print supports the core from below. It will also be understood that the construction and arrangement of parts illustrated can be modified in various other respects without departing from the invention as defined in the appended claims.

What I claim is:

core disposed said cavity. so as to form the cup shapematrlx of the mold, said core comprising abody of green sand and a metallic reinforing structure having a stem withf downwardly extending branches embedded 1n thesand body and an annular core print rigid with said stem and engaging the mold body adjacent the mouth of its cavity to sustain osition the core.

2. n apparatus for forming cup-shape castin s, the combination of a metal mold bodyl aving an open-topped cavity and a pouring gate leadin into said cavity; and a core disposed in sai cavity so as to form the cup shape matrix of the mold, said core comprising a body of green sand and a metallic reinforcing structure having a stem with downwardly tapering branches embedded in the sand body and an annular core print rigid with said stem and en aging the mold body adjacent the mouth 0 its cavity to sustain and position the core.

3. In apparatus for forming cup-shape castings, the combination of a metal mold body having an open-topped cavity and a pouring gate leading into said cavity; and a core disposed in said cavity so as ,to' form the cup shape matrix of the mold, said core comprising ab'ody of green sand that forms the inner bottom and side wallsand the annular top wall of said matrix and a metal reinforc- 'cup shape matrix of the mold, said core coming structure having a section embedded in the sand and circular core print section rigid with the embedded section and engaging the mold body adjacent the mouth of its cavity to 5 sustain and position the core.

4. In apparatus for forming cup-shape castin t e combination of a metal mold body aving an open-topped cavity, and a pouring gate leadin into said cavity; and a core disposed in sai cavity so as to form the section and adapted by gravity to hold the coreidown'against the buoyant action of the molten metal. 1

. 5. In apparatus for forming chambered castings, with c lindrical sides the combination of a pair 0 metal mold halves having in their adjacent faces mating recesses to form the side walls of the inold cavity and additional mating recesses to form a pouring gate leading into said cavity; means for slidably supporting said mold halves for movement toward and away from each other; an upstanding metal cylinder supported at its lower end, said cylinder beingishaped to fit within the lower parts of said recesses and form the bottom wall of the mold cavity; and a core structure di to complete the matrix for thecasting.

6. In apparatus for forming chambered castings with cylindrical sides the conibination of a pair of metal mold halves having in ment toward and away from each other; an

upstanding metal cylinder supported at its lower end and normally fixed in relation to said supporting means, said cylinder bein shaped to fit within the lower parts of sai d in the mold cavity recesses and form the bottom wall of said cavity; and a core structuredisposed in the mold cavity to complete the matrix for the casting.-

In testimony whereof, I hereunto afiix my

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