US2956321A

US2956321A - Halward

Info

Publication number: US2956321A
Authority: US
Publication date: 1960-10-18
Anticipated expiration: 1977-10-18

Description

F. HALWARD 2,956,321

UNIT an: CAST nms 4 Sheets-Sheet 1 Filed Aug. 4. 1958 INVENTOR.

Fa 5 Mama/9,90

Irma/7 Oct. 18, 1960 F. HALWARD UNIT pm cm was 4 Sheets-Sheet 2 Filed Aug. 4. 1958 IN V EN TOR.

4r TORl/EY Oct. 18, 1960 F. HALWARD 2,956,321

- UNIT DIE CAST DIES Filed Aug. 4, 1958 4 Sheets-Sheet 3 1N VEN TOR.

F0 Lin? 6094 we mo BY $444M.

Oct. 18, 1960 F. HALWARD 2,956,321

UNIT DIE CAST DIES Filed Aug. 4, 1958 4 Sheets-Sheet 4 7 INVENTOR foure Hm. wnno BY K W ATTORNEY United States Patent UNIT DIE CAST DIES Folke Halward, Southfield Township, Mich., assignor to Detroit Mold Engineering Company, Detroit, Mich., a corporation of Michigan Filed Aug. 4, 1958, Ser. No. 752,908

12 Claims. (Cl. 22-68) This invention relates to die casting machines and more particularly to the construction and mounting therein of unit die cast dies.

It is the object of the present invention to provide in combination with a die cast machine, an ejector housing adapted for securing to the reciprocal platen of said die cast machine and incorporating therein a master ejector plate. In conjunction therewith and projected into laterally opening side portions of the ejector housing and master ejector plate there is removably positioned a pair of independent unit die cast dies.

It is the object of the present invention to provide a novel ejector housing with master ejector plate together with means for removable assembly and interconnecting therewith a pair of interchangeable unit die cast dies.

It is another object herein to provide a novel ejector housing having a series of bores to slidably receive a series of reciprocal racks together with interconnected rotatable pinions in driving relation with said racks for simultaneous reciprocal movement thereof.

It is a further object to provide a novel unit die cast die which consists of a cavity retainer plate, an ejector plate carrying ejector sleeves projecting into said cavity plate, an anchor plate adapted for interlocking with the ejector housing, together with cores respectively secured to the anchor plate and projecting through the ejector plate and into the cavities in said cavity plate.

It is a further object to provide in said unit die cast die, a prefabricated cavity plate with the cavities arranged for a particular die cast operation, and with the ejector plate, ejector sleeves, anchor plate and associated cores previously assembled as a unit adapted for projection into the lateral opening of the ejector housing, with said anchor plate interlockingly engageable with and secured to the ejector housing, and with the ejector plate secured to said master ejector plate for movement therewith, and with the respective cavity plate adapted for securing fixedly to the ejector housing.

It is another object to provide a novel form of clamp structure for removably anchoring the assembled uni-t die cast die and particularly the cavity retainer plate with respect to the ejector housing.

It is a further object to provide a center block on the master ejector plate adapted to interlockingly receive the respective ejector plates from the individual oppositely arranged unit die cast dies.

It is a further object to provide an upright center block within the ejector housing adapted to interlockingly receive inner end portions of the respective cavity retainer plates of the individual unit die cast dies.

It is still another object to provide in conjunction with the anchor plate mountable upon the stationary platen of a die cast machine, an upright center block adapted to interlockingly receive and secure the inner ends respectively of the individual cavity retainer plates of the oppositely arranged unit die cast dies.

This construction also includes suitable clamping means forsecuring the respective outer ends of said cavity retainer plates to outer portions of the stationary anchor plate. 7

These and other objects will be seen from the following specification and claims in conjunction with the appended drawings in which:

Fig. 1 is a fragmentary partially broken away and sectioned side elevational view of the ejector housing and assembled unit die cast die and associated stationary cavity plate.

Fig. 2 is a fragmentary plan view thereof.

Fig. 3 is another fragmentary plan view thereof partly broken away and sectioned, but showing the complete assembly of the stationary anchor plate.

Fig. 4 is an end elevational view of the structure shown in Fig. 3.

Fig. 5 is a schematic diagram illustrating the mounting of the present ejector housing and unit die cast dies, and stationary cavity plate with respect to the movable and stationary platens of a die cast machine.

Fig. 6 corresponds to Fig. 3, being a fragmentary horizontal section taken on line 66 of Fig. 1, with one replacement unit partially removed.

Fig. 7 is a vertical section taken on line 77 of Fig. 1, illustrating the shape of the master ejector plate.

It will be understood that the above drawings illustrate merely a preferred embodiment of the invention, and that other embodiments are contemplated within the scope of the claims hereafter set forth.

Referring to the drawings, Fig. 5 diagrammatically illustrates the environment of use of the present invention wherein the movable platen of a die cast machine is indicated at A and the stationary platen at B. An ejector housing 11 is suitably secured to platen A, including cavity plate 31, whereas anchor plate 65 is suitably secured to stationary platen B and carries stationary cavity plate 63.

A suitable linkage C and D is pivotally connected at E to stationary platen B and its opposite end is joined at 17 to one of the rotatable pinions which operates automatically the master ejector plate hereafter described depending upon the relative motion of platen A with respect to platen B.

The present ejector housing 11, shown in Fig. 1, includes the laterally elongated top plate 12 and spaced therebelow the bottom plate 13, there being an intermediate solid body 15 secured therebetween as by welding or by bolts.

Each of plates 12 and 13 has in its outer surface the transversely extending notches 14 providing means for securing ejector housing 11 to the reciprocal platen A of the die cast machine diagrammatically shown in Fig. 5.

Body 15 has a pair of transverse vertically spaced bores formed therethrough adapted to rotatably journal and support the pair of vertically spaced elongated pinions 16 which extend through said ejector housing.

The outer end of top pinion 16 is formed at 17 of square shape to facilitate its connection with operating link D shown in Fig. 5 by which rotative motion is delivered to pinion 16 and the corresponding lower pinion through the intermeshing spur gears 18 respectively secured upon pinions 16 within corresponding recesses in body 15.

Said body has a top and bottom transverse series of longitudinally extending bores arranged respectively above and below the upper and lower bores in said body which receive pinions 16.

The respective upper and lower series of bores slidably receive therein the elongated racks 19 portions of which intermesh with pinions 16 in driven relation whereby rotary movement of pinions 16 will effect corresponding reciprocal movements in unison of all of the racks 19. I As shown in Fig. 2 said racks at their inner ends terminate in the reduced axial extensions 20 which project into and are fixedly secured to upright master ejector plate 21 which is movably nested within housing 11 between plates 12 and 13. Said master ejector plate is of recumbent'H-shape so as to define upon its opposite sides the outwardly opening recesses 22, Fig. 1 in conjunction with the corresponding outwardly opening recesses on opposite sides of housing 11. V I

These outwardly opening recesses as hereafter described are adapted to removably receive the respective unit die cast dies as an assembled unit. Each of the unit die cast dies includes

elements

31, 28, 27, 30, 41, 40, 35, 36, 37 and 39, Fig. l, to be described in detail. These unit die cast dies are projected into the outwardly opening opposite sides of the ejector housing.

Upright outer outer end portions of master ejector plate 21 are cut away to provide the lateral extensions 23 of reduced thickness by which the individual ejector plate 27 in each of the unit die cast dies may be secured to said master ejector plate, employing bolts 29, Fig. 1.

Upright center block 24 is located at the center of master ejector plate 21 and secured thereto by screws 25, Fig. 3, and includes the lateral projections 26 adapted to interlockingly receive the corresponding upright inner edge of the respective ejector plate 27 in the individual unit die cast die. This provides an effective means of securing the individual ejector plates to the master ejector plate for movement therewith. Ejector plate 27 includes ejector sleeve securing plate 28 fixedly mounted thereon adapted to anchor the horizontally disposed ejector sleeves 30, one of which is shown for illustration. Normally there would be a number of said sleeves corresponding to the number of cavities in cavity plate 31, into which said sleeves slidably project.

The unit die cast die also includes the upright rectangularly shaped cavity retainer plate 31 which has preformed therein a series of cavities 58 adapted for registry with corresponding cavities 64 formed in the stationary cavity plate 63 thereafter described. These cavities define the finished die cast article 59, a portion of which extends across the parting line 57 between cavity plates 31-63.

Mounted upon the interior upright wall of body 15 upon opposite sides thereof are the laterally spaced anchor plates 32 secured as at 33. Each plate 32 has undercut retaining shoulders 34 adapted to slidably and interlockingly receive projections 33 of end plates 37 secured at 39 to the core anchor plate 35 of one of the unit die ing to the stationary platen B of the die cast machine,

cast dies.

Said anchor plate has secured thereto core anchor plate 36 which retains between plates 35- 36 the heads 40 of a series of elongated cores 41, one of which is shown. Each core slidably projects through a corresponding aperture in ejector plate 27 and through the bore of an ejector sleeve 30 and into cavities 5864 to define the internal bore of the molded article 59.

Accordingly the

elements

31, 28, 27, 36, 35, and 37 as well as the sleeves 3t) and -cores 41 all form a part of the unit die cast die which is projected into one of the lateral openings of the ejector housing 11 between plates 12 and 13. In this connection, it is noted that the

anchor plate assembly

35, 36, and 37 interlockingly engages plate 32 as the unit die cast die is movably projected into the ejector housing.

Instead of ejector sleeves 3i) and cores 41, conventional ejector pins, may be employed as an equivalent assembly. When in its final assembled position, the unit die cast die is fixedly secured therein by securing the individual ejector plate 27 at its top and bottom to the outer extensions 23 of the master ejector plate 21 using bolts 29.

As shown in Figs. 2-3 there is provided another upright center block 42 intermediate the sides of the ejector housing and suitably secured to top and bottom plates 12 and 13. Opposite upright sides of block 42 have lateral projections 43 adapted to interlockingly project with- 4 in corresponding upright notches 45 formed in the inner upright edge of the respective cavity plate 31.

Dowel pins 44 are anchored within and project outwardly from center block 42 and upon assembly of the unit die cast dies retainingly and cooperatively project within preformed laterally opening apertures 46 within the end faces of cavity plates 31.

In the preferred embodiment said dowel pins at their projecting ends arediarnond shaped for cooperative positioning within circular apertures '46 in said cavity plates. This interlock between center block 42 and the respective cavity plates 31 occurs as the unit :die cast ,dies are assembled into the ejector housing.

The assembly is further completed 'by employing upon each side of the ejector housing a pair of vertically spaced clamps 49 whose bifurcated ends 50 are tapered upon their inner surfaces for cooperative retaining engagement with the respective tapered undercut

surfaces

47 and ,48 formed within ejector housing 11 and cavity plate 31.

Said clamps are secured in the assembled position shown in Figs. 2 and 3 by the bolts 51 threaded into the ejector housing and through the oversized openings 53 in clamp blocks 49. These openings are larger than the respective socket heads 52 .of bolts 51 to permit quick disassembly of clamp block 49 upon release of latch 54. Said latch is pivotally mounted at 55 on clamp block 49 and includes the arcuate slot 56, which cooperatively receives bolt 51 between its head and the end face of block 49.

The clamp is secured by tightening bolt 52. Slight loosening of bolt 52 permits disengagement of clamp 54, permitting disassembly of clamp block 49.

As shown in Fig. 2, cavity plate 31 has horizontally extending apertures therethrough enlarged atparting line 57 to receive bushings 61. Corresponding guide pins 62 are secured to and project outwardly from stationary cavity plate 63 for sliding registry within bushings 61 and bores 60 to guarantee proper alignment of

cavity plates

31 and 63 when they are brought together in the die casting machine, Fig. 5.

The above stationary cavity retainer plate 63 has preformed therein in accordance with a particular die casting operation cavities 64, Figs. 1 and 3, one of which is shown, adapted for cooperative registry with the corresponding cavities58 in reciprocal cavity plate 31. Cavity plate 63 is mounted upon one side of anchor plate and secured thereto. Plate 65 has across its top and bottom surfaces elongated slots 67 providing a means of anchor- Fig. 5.

An upright-center block 66 is secured upon the inter1or surface of plate 65 by bolts 69, Figs. 3 and 4 and has 1 upon its opposite sides the upright lateral projections 43 adapted to interlockingly project into corresponding upright grooves 45 in the upright inner edges of the removitble and interchangeable cavity plates 63, shown in Figs.

and 3.

The outer upright edges of the respective cavity plates 63 are similarly clamped to corresponding outer edge portions of anchor plate 65 in the same manner and bythe same type of clamp 49 above described with respect to Figs. 1 and 3. Here also dowel pins 44 are secured to center block 66 and project laterally thereof as in Fig. 3 and extend into apertures 46 within the interior upright walls of cavity plates 63 completing the assembly of said cavity plates with respect to anchor plate 65.

As shown'in Fig. 1, the return pins 68 are anchored at their ends to the

ejector plate assembly

27 and 28. The outer ends of said pins operatively engage the inner surface of cavity plate 63 for returning said ejector plates 27 to inoperative position shown in Fig. 2 when the cavity plates .31 and 63 are brought together at parting line 57.

Referring to Fig. 3, pins 71 are secured to center block 66 and project outwardly thereof for cooperative engagement within bushings 70 within center block 42.

Anchor plate 65 in a conventional manner has a formed aperture in its front wall adapted to receive the die cast machine nozzle 72 which delivers molten die cast material through passage 73 into the central tapered bore of sprue bushing 74. Said bushing extends through center block 66 and cooperatively and loosely receives the tapered sprue spreader 76 defining the annular diverging passageway 75 therebetween by which molten die cast material is delivered to the conventional gates 78 for projection into the

respective cavities

64 and 58 within the meeting surfaces of

cavity plates

31 and 63 in a conventional and well-known manner. The inner end of sprue spreader 76 is nested within a corresponding opening in center block 42 and secured thereby fastener 77.

Having described my invention, reference should now be had to the following claims.

" I claim:

"1. In combination, an ejector housing with opposing sides and adapted for securing to the reciprocal platen of a die cast machine and including spaced top and bottom plates and an intermediate body having a series of horizontal bores, longitudinally reciprocal racks in said bores, movable means connecting said racks for movement in unison, an upright master ejector plate with opposing ends and of recumbent H shape in said housing secured to said racks, opposite ends of said master ejector plate and opposite sides of said housing opening laterally, an upright center block secured to said housing intermediate its opposite sides, and a pair of unit die cast dies respectively projected laterally into the openings on opposite ends of said master ejector plate and sides of said housing, each unit die cast die comprising an upright cavity plate with inner and outer ends and having preformed cavities therein, said cavity plate interlocked with and secured at its inner end to said center block, clamping means securing the outer end of said cavity plate with said housing, an upright reciprocal secondary ejector plate rearwardly of said cavity plate and fixedly secured to said master ejector plate, ejector means secured to said secondary ejector plate slidably positioned through said cavity plate in registry with said cavities respectively, an upright core anchor plate nested loosely within said master ejector plate and secured to said housing, and a series of cores secured at their one ends to said anhcor plate with their other ends projecting loosely through said secondary ejector plate and cavity plate and into said cavities respectively.

2. In the combination of claim 1, said cavity plate, secondary ejector plate, ejector means, cores and core anchor plate defining a unit die cast die, said unit die cast dies being laterally inserted into said ejector housing from opposite sides, with said core anchor plates interlocked with the body of said housing.

3. In the combination of claim 1, there being an upper and lower series of racks, said movable means connecting said racks consisting of a pair of vertically spaced elongated pinions journaled through said housing body, the upper pinion meshing respectively with the upper series of racks, the lower pinion meshing respectively with the lower series of racks, intermeshing gears spectively secured on each of said pinions, and means for intermittently and rotatably actuating one of said pinions.

4. In combination, a hollow ejector housing with opposing sides and adapted for securing to the reciprocal platen of a die cast machine, an upright master ejector plate with opposing ends and of recumbent H shape within said housing, means in said housing for longitudinally reciprocating said master ejector plate, the opposite ends of said master ejector plate and opposite sides of said housing opening laterally, an upright center block secured to said housing intermediate its opposite sides, and a pair of unit die cast dies respectively projected laterally into the openings on opposite ends of said master ejector plate and sides of said housing, each unit die cast die comprising an upright cavity plate with inner and outer ends and having preformed cavities therein, said cavity plate interlocked with and secured at its inner end to said center block, clamping means securing the outer end of said cavity plate with said housing, an upright reciprocal secondary ejector plate rearwardly of said cavity plate and fixedly secured to said master ejector plate, ejector means secured to said Secondary ejector plate slidably positioned through said cavity plate in registry with said cavities respectively, an upright core anchor plate nested loosely within said master ejector plate and secured to said housing, and a series of cores secured at their one ends to said anchor plate with the other ends projecting loosely through said secondary ejector plate and cavity plate and into said cavities respectively.

5. In the combination of claim 4, said cavity plate, ejector plate, ejector means, cores and core anchor plates defining a unit die cast die, said unit die cast dies being secondary laterally inserted into said ejector housing from opposite sides, said core anchor plates interlocked with the body of said housing.

6. In combination, a hollow ejector housing with opposing sides adapted for securing to the reciprocal platen of a die cast machine, an upright master ejector plate within said housing, means in said housing for longitudinally reciprocating said master ejector plate, the opposite sides of said housing opening laterally, an upright center block secured to said housing intermediate its opposite sides, and a pair of unit die cast dies respectively projected laterally into the openings on opposite side of said housing, each unit die cast comprising an upright cavity plate with inner and outer ends and having preformed cavities therein, said cavity plate interlocked with and secured at its inner end to said center block, clamping means securing the outer end of said cavity plate with said housing, an upright reciprocal secondary ejector plate rearwardly of said cavity plate and fixedly secured to said master ejector plate, and ejector means secured to said secondary ejector plate slidably positioned through said cavity plate in registry with said cavities respectively.

7. In the combination of claim 6, said auxiliary ejector plates having inner upright edges, an upright center block secured to said master ejector plate and having opposite sides, the inner upright edge of the secondary ejector plate in each of said unit die cast dies interlockingly engaging said latter center block on its opposite sides.

8. In the combination of claim 6, the interlock between said housing center block and the cavity plates of said unit die cast dies consisting of cooperating slots and projections, and outwardly extending dowel pins on said latter center block projecting into said cavity plates.

9. In the combination of claim 6, there being tapered recesses in said housing and cavity plates, said clamping means consisting of bifurcated blocks secured at the top and bottom of said housing on its opposite sides and having tapered ends respectively projecting into the correspondingly tapered recesses in said housing and cavity plates.

10. In the combination of claim 6, there being tapered recesses in said housing and cavity plates, said clamping means consisting of bifurcated blocks secured at the top and bottom of said housing on its opposite sides and having tapered ends respectively projecting into the correspondingly tapered recesses in said housing and cavity plates, the securing of each block consisting of a bolt extending through an oversize opening therein and threaded into said housing, and a latch plate pivoted :7 upon said block, and having a locking groove registen able with said bolt between the bolt head and said block, release of said latch plate permitting withdrawal of said block over said bolt.-

11. In the combination of claim 6, an upright anchor plate with outer ends adapted ,for securing to the fixed platen of a die cast machine, an upright center block securedto said anchor plate, a pair of transversely aligned cavity plates in longitudinal registry respectively With the cavity plates of each unit die cast die, and having inner and outer ends, with their inner ends interlocked With said latter center block, and clamping means securing the outer ends of said latter cavity plates respectively with the outer ends of said anchor plate, said latter cavity plates having preformed cavities therein registerable respectively with preformed cavities in the cavity plates of said unit die cast dies.

12. In the combination of claim 6, an upright anchor plate with outer ends adapted for securing to the fixed platen of a die cast machine, an upright center block secured to said anchorplate, a pair of transversely aligned cavity plates in longitudinal.registryrespeetively .with the cavity plates of each unit die cast die and having inner and outer ends, with their inner ends interlocked with said latter center block, andclamping means securing the outer ends of said latter cavity plateslrespectively with outer ends of said anchor plate, saidlatter cavity plates having preformed cavities therein reg'isterable respectively with preformed cavities in the eavityplates of said unit die cast dies, the interlock between said latter center block and cavity plates on said anchor plate consisting of cooperating slots and projections and.outwardly extending dowellpins on said center'block projecting into said cavity plates.

ReferencesCitedin the file of this patent V UNITED STATES PATENTS 1,803,300 Fahlman Apr. 28, 1931 2,233,405 Fahlman Mar. 4, 1941 2,261,592 Smith Nov. 4, 1941 2,618,823 Perkon Nov. 25, 1952 2,800,685 Gaved July 30, 1957