US3191246A - Die casting apparatus - Google Patents

Description

June 29, 1965 H. E. POUELL 3,191,246

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3,191,246 Dm CASTING APPARATUS Harry E. Poueli, Logansport, Ind, assignor, by direct and mesne assignments, of one-sixth to George A. Gust and one-sixth to Robert G. Irish, both of Fort Wayne, End,

and one-third to Mary M. Fouch, Kokomo, Ind.

Filed June 9, I961, Ser. No. 116,124) 21 tllairss. (Cl. 22-65) The present invention relates to an improved die casting apparatus for manufacturing wheel balance weights and the like.

Wheel balance weights as attached to the rims of automobile wheels conventionally consist of two parts, namely, a U-shaped clip fabricated of strip steel stock and a lead body having imbedded therein one leg of the clip. These balance weights have been manufactured for many years by means of equipment operated under different degrees of automation; however, to the best of my knowledge and belief, no prior art machine has successfully, for mass production purposes, manufactured wheel balance weights by apparatus which are operated completely automatically.

It is, therefore, an object of this invention to provide die casting apparatus for manufacturing wheel balance weights and the like which may be operated automatically for providing a finished balance weight free of hash and reside sprue and ready for attachment to the rim of an automobile wheel.

It is another object of this invention to provide mechanism whereby U-shaped clips may be fed to a die automatically in operations which are sequential and do not require manual attendance.

It is another object of this invention to provide die casting apparatus wherein the sprue developed in casting a wheel balance weight may be automatically sheared from the finished weight in such a manner as to require no further finishing before the weight is applied to a wheel or the like.

It is still another object of this invention to provide a unique arrangement of casting molds which may be operated in such a manner as to provide a single die cavity during the casting of a wheel balance weight and thereafter be separated in order to eject mechanically the finished weight from the mold. Additionally, it is an object to provide means for closing the mold as a first step, feeding a U-shaped clip to the mold prior to injection of molten metal thereinto, injecting molten metal into the die cavity, thereafter opening the mold, shearing the sprue off the finished weight, and then ejecting the weight from the apparatus in finished form. As a further object, automatic means are provided for effecting all of these operations in rapid sequence.

As a still further object of this invention, numerous, unique subcombinations and assemblies are provided which may be used in die casting apparatus which is operable either fully automatically or semiautomatically.

Further objects will become apparent as the description proceeds.

The above-mentioned and other features and objects of this invention and the manner of attaining them will become more apparent and the invention itself will be best understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein:

In the drawings:

FIG. 1 is a perspective illustration of a typical, conventional wheel balance weight;

FIG. 2 is a sectional illustration taken substantially along section line 22 of FIG. 1;

FIG. 3 is a rear perspective illustration, partially broken away and sectioned for clarity, of an embodiment of the present invention;

United States Patent FIG. 4 is a front perspective illustration of the embodiment of FIG. 3, also partially broken away and sectioned for clarity of illustration;

FIG. 5 is a top plan view of the apparatus of FIGS. 3 and 4, partially sectioned and broken away for clarity of illustration;

FIG. 6 is a perspective view partially sectioned and broken away of the various mold sections which are operable to provide a die cavity;

FIG. 7 is a side view of the rear mold sections of FIG. 6 and the sliding support therefor;

FIG. 8 is a rear view of the subassembly of FIG. 7 taken substantially along the section line 38;

FIG. 9 is a top plan view of the mold sections and mounting apparatus shown partly sectioned horizontally to reveal cooling water cavities;

FiG. 10 is a cross-sectional illustration taken substantially along section line iii-10 of FIG. 9;

FIG. 11 is a cross-sectional illustration taken substantially along section 1I11 of FIG. 9 and showing the water passage for cooling the movable die member;

P16. 12 is a fragmentary top plan view of the movable die sections, the carrier therefor, cam-actuating devices and a portion of the mechanism for feeding clips to the die sections, this figure being somewhat enlarged to show various elements more clearly;

FIG. 13 is a cross-sectional illustration taken substantially along the section line 1313 of FIG. 12;

FIG. 14 is a cross-sectional illustration taken substantially along section line 1414 of FIG. 12;

FIG. 15 is a cross-sectional illustration taken substantially along section line 15-15 of FIG. 12, this figure illustrating one of the operative positions of the crossslide;

FIG. 16 is a sectional illustration taken substantially long the section line 16-16 of Fid- 12 partially broken away for clarity of illustration and showing the means for feeding a U-shaped clip to the die cavity, the mechanism being shown in actuated position whereby a clip is being fed to the die cavity and molten lead is also being injected into the cavity;

FIG. 17 is a fragmentary sectional view similar to FIG. 16 but showing the position of the various parts just prior to the injection of molten lead into the die cavity;

FIG. 18 is a fragmentary view similar to FIGS. 16 and 17 but showing the clip-plunger retracted and the sprucshearing device partially actuated;

FIG. 19 is a sectional illustration similar to FIG. 18 showing the clip-plunger retracted and the sprue-shearing device fully actuated to sever the sprue and also to eject the finished balance weight from the apparatus;

FIGS. 20a, 20b, 20c and 20d are diagrammatic illustrations of the cross-slide mechanism which cooperates with the clip plunger to feed clips to the die cavity, these various views showing the mechanism in different operative positions;

FIG. 20a is a side view of the mechanism of FIGS. 20a through 20d inclusive illustrating certain of the camming means used in operating the cross-slide;

FIG. 21 is a perspective illustration partially broken away and sectioned of a portion of the clip-feeding mechanism;

FIG. 22 is a cross-sectional illustration taken substantially along section line 22--22 of FIG. 21;

FIG. 23 is a cross-sectional illustration taken substantially along section line 2 323 of FIG. 21;

FIG. 24 is a top plan view of the horizontal and inclined feed-rails, partially broken away and sectioned, of the mechanism of FIG. 21;

FIG. 25 is a cross-sectional illustration taken substan tially along section line 25--25 of FIG. 24;

FIG. 26-is a partial, front perspective view of the apparatus showing the clip-feeding assembly coupled to the die-casting mechanism;

FIG. 27 is a front view of the clip-plunger assembly assembled to the distal, feeding end of the mechanism of FIG. 21; N p a FIG. 28 is a partial top plan view of the detent device used .in the clip-feeding mechanism of FIG. 21, this detent device being used for feeding U-shaped clips in unison with protractile rail movement; I 7,

FIG. 29 is a partial side elevation of the mechanism shown in FIG. 28 showing the back stop which is engaged by the clips during retractile movement of the horizontal,

clip-conveying rail; 7 7

FIG. 30 is a side elevation of the inclined feed rail which forms a portion of a clip-feeding mechanism partially shown in FIG. 21; g V a FIG. 30a is a fragmentary side elevation ofthe inclined feed rail of FIG. 30 showing the clip-derailing device;

FIG. 30b is a top view of FIG. 30a; V FIG., 31 is a cross-sectional illustration taken substantially along section line 3131 of FIG. 30;-

FIG. 32 is .a sectional illustration taken substantially 'alqngsection line 32-32 of FIG. 30;

FIG. 33 is a rear .side view of the assembly of FIG. 30;

FIG 34 is a perspective illustration of the vibrating mechanism which feeds automatically clips to the inclined rail of FIG 30;

FIG. 35 is a side elevation shown partially in crosssection taken along the section line 3535 of FIG. 34;-

FIG. 36 is a horizontal section taken substantially along section line 36-36 of FIG. 35; a FIG. 37 is a side view of the barrel cam; I

FIG. 38 is a cross-sectional view taken substantially along section line 38-38 of FIG. 37; v

FIG. 39 is a cross-sectional view taken substantially along section line 39-3 9 of FIG. 37

'FIG. 40 is a diagrammatic development of the periphery of the barrel cam of FIG. 37 showing the relative'arrangement of the various cam grooves;

FIG. 41 is a diagrammatic planar development of the camming groove in the end of the barrel cam of FIG. 37 showing the relationship of this camming groove with the various grooves in the view of FIG. 40; and

FIG. 42 is a diagrammatic illustration of the entire apparatus of this invention with certain parts being removed and sectioned for clarity of illustration.

Referring to the drawings, and more particularly to FIGS. 1 and 2, a wheel balance weight of the type fabricated by the apparatus of this invention is conventional and comprises a U-shaped clip 56 fabricated of sheet or strip steel stock having one leg imbedded in, an arcua-tely shaped lead body 51. The apparatus of thisinvention not only molds the lead body 51 but also positions the clip 50 properly so that the lead body can be molded around the one clip leg. The apparatus as hereinafter described is particularly suited for fabricating this wheel balance weight automatically. a p

Referring to FIGS. 3, 4, 5, 6, 9, and 42, the apparatus is shown as comprising a stationary frame or support 52 having two upstanding sides 54 which are spaced apart I and par-alleles shown more clearly in FIG. 8. On the upper edges of these two plates 54 are mounteda pair of inwardly facing gib rails 56 which have slidably mounted for-reciprocation thereon a plate or carrier 58 (FIGS. 5, 6, 8, 9, 10, 11, 12 and 42.)

Mounted on and extending between the stationary side plates 54 is another stationary, flat plate 60 which is'se t at an angle of 45 with the vertical so as to be inclined as shown in FIGS. 3, 6 .and 7. FIG. 8 shows a rear view of this plate. Referring more specifically to FIGS. 6 and 7, this plate 60' has mounted on the upper, horizontal end 4, cated by the reference numeral 68 which provides an elongated exposed corner 70 which, as will be described hereinafter, serves as a gib or way on which rear mold sections 72 and 74 slide.

These rear mold sections 72 and 74, shown more clearly in FIGS. 6, 7, 9,12 and 16, constitute halves of a single each'of the grooves 76 fitting over the corner 70 provided by the gib block 64. A bar 78 bolted to the inclined plate 60 extends along the upper surface 66 of the latter parallel with the corner 70 and is engaged by the lower. edges 80 of the two mold sections 72 and 74 as shown more clearly in FIGS. 6 and 7. The combination of the bar 78 and the. corner 70 forms a way in which the two mold sections 72 and 74 may -be .reciprocated alternatively into and out of engagement with each other.

'The facing ends 82 and 84 of the mold sections 72 and '74, respectively, (FIGS. 6 and 1 2), are machined perfectly fiat and complementary so that when the two sections 72 and .74 are abutted at the surfaces 82 and 84, a single,unitary die block having a cavity-recess 86 is provided. The two mold sections 72 and 74 are of uniform thickness and are provided in the facing ends 82 and 84 there-of with halves 88 (\FIG. 6) of a sprue hole. When the surfaces 82 and 84 are abutted against each other, the two halves 8'8 register with each other to form a single, elongated passage which communicates with the cavity recess 86. The sprue halves 88 are shown as forming a single passage in FIGS. 16 and 17 Straddling the surfaces 82 and'84 of the mold sections when the surfaces are abuttedis an upstanding lip 90 (FIG. 6) on each of the mold sections 72 and 74. These lips 90 constitute halves of a clip-receiving portion of the mold sections when the latter are abutted, the cross-section of the lip sections 90 being shaped the same as the inner cross-sectional contour of the clip as shown in FIGS. 1 and 2. The configuration of this lip- 90 and the manner in which the clip 50 fits thereover is shown more clearly inFIGS.16-,17,18 andl9.

These lips 90 are machined into the mold sections 72 V and 74, and when abutted, the totallip length corresponds surface 62 a gib block 64 which is elongated and which 7 extends forwardly over the upper inclined surface 66 of the inclined plate 60. This overhanging portion is indialmost precisely with thelength pfa single clip 50 (FIGS. 1. and 2). At theopposite ends of the joined lips, shoulders 91 extend transversely and are spacedapart aclip length to receive therebetween a clip 50 with only negligible clearance. It should be noted that the clip-receiving portion as constituted by the two lips is positioned in substantially the exact center of the moldsections 72 and 74 and immediately adjacent to the cavity recess 86 so'that a clip placed over the clip-receiving portion has one leg entered into the recess 86. This will be explained more fully later in the description.

The gib bloclg 64 immediately to the rear of the two mold sections 72 and 74 is provided with a rectangular cut-out 92 (FIG. 6) for a purpose which will be explained more fully in the following. This cut-out 92 has ,a width equal tothe length of the clip-receiving portion 90 and a clip '50. 'Also,,the rear surface94 of the cut-out is slanted at an angle of 45 in line with the surface 66 of the vin- .clinedplate60. Thisis be.st;illustratcd in FIGS; 16,17,

. m a I On the opposite ends of thetwo mold sections 72 and 74 are provided two rollers 96 and 98, respectively, (FIGS. 5 6, 8, 9 and 12), which fit'into two camming grooves 100 and 102 provided in the under surface of thefcarriage plate 58. These grooves 100faand 102 are identical in shape to each other but are oppo'sitelyshaped so as to 4 move the mold sections 72 and .74. inwardly and outwardly,

respectively, in response to reciprocation of the carrier

Claims (1)

1. DIE CASTING APPARATUS COMPRISING IN COMBINATION A SUPPORT, A SINGLE DIE MOUNTED ON SAID SUPPORT AND HAVING A RECESS THEREIN, SAID DIE BEING SUPPORT AND HAVING SECTIONS HAVING ABUTTING SURFACES , MEANS MOUNTING SAID MOLD SECTIONS FOR MOVEMENT IN A FIRST RECTILINEAR DIRECTION TOWARD EACH OTHER TO ENGAGE SAID ABUTTING SURFACES AND THEN AWAY FROM EACH OTHER TO DISENGAGE SAID ABUTTING SURFACES, A SPRUE HOLE PASSING THROUGH SAID SINGLE DIE IN REGISTRY WITH SAID ABUTTING SURFACES WHEN ENGAGED, ONE PORTION OF SAID HOLE BEING IN ONE SURFACE AND THE OTHER PORTION BEING IN THE OTHER SURFACE, ONE PORTION OF SAID RECESS BEING IN ONE MOLD SECTION AND THE OTHER PORTION THEREOF BEING IN THE OTHER MOLD SECTION, A MOVABLE DIE MOUNTED ON SAID SUPPORT FOR MOVEMENT IN A DIRECTION TRANSVERSE TO SAID FIRST DIRECTION SELECTIVELY INTO AND OUT OF ENGAGEMENT WITH SAID SINGLE DIE, SAID MOVABLE DIES HAVING A RECESS THEREIN, SAID SINGLE AND MOVABLE DIES HAVING ENGAGEABLE SURFACES WHICH SURROUND A DIE CAVITY FORMED BY THE RECESSES THEREIN, A SPRUE-SHEARING DEVICE MOUNTED ON SAID SUPPORT AND HAVING A RECIPROCABLE SHEAR HEAD THEREON WHICH MOVES IN THE SPACE BETWEEN SAID ABUTTING SURFACES WHEN SAID MOLD SECTIONS ARE PARTED, MEANDS FOR MOVING SAID MOLD SECTIONS INTO ENGAGEMENT WITH EACH OTHER AND SAID MOVABLE DIE INTO ENGAGEMENT WITH SAID SINGLE DIE FORMED BY THE ENGAGED MOLD SECTIONS, INJECTION MEANS FOR INJECTING MOLTEN METAL THROUGH SAID SPACE HOLE INTO SAID DIE CAVITY, MEANS FOR SEPARATING SAID MOLD SECTIONS AND MOVABLE DIE FROM EACH OTHER AFTER SAID METAL HAS HARDENED, SAIDS SHEAR HEAD HAVING SPRUE-CUTTING MEANS MOVABLE TO A POSITION CONTIGUOUS WITH A PORTION OF THE WALL OF SAID CAVITY AND A PORTION OF SAID INJECTION MEANS, AND MEANS FOR ACTUATING SAID SPRUE-SHEARING DEVICE TO MOVE SAID SHEAR HEAD BETWEEN THE SEPARATED ABUTTING SURFACES FOR SHEARING OFF THE SPRUE FORMED BY SAID SPRUE HOLE.

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