US2253651A - Knockout for die casting machines - Google Patents

Description

Aug. 26, 1941. L RING I2,253,651

xN'oQKoUT For; DIE CASTING MACHINES Fixed May 17', 1940 2 sheets-sheet 1 T7511@ f 4 2" 9 g lue 4 f6 v Il j. I: l ."llf

Aug. 26, 1941.l L RING 2,253,651

xNocKoUT FOR DIE CASTING MACHINES Filed May 17, 1940 2 Sheets-SheetI 2 d nuentor :w f' Gttornegs Patented A118 26i 1941 j t i AuNiTi-:D STATE KNOCKQUT FOR- s PATENTy oFFglcE Lucian Ring, Detroit, Mich., assignor to Ternstedt Manufacturing Company. Detroit, Mich., acorporation of Michigan Application May 17, 1940, Serial No. 335,827

A solaire.. This invention relates to the art of die casting and more. particularly to an improvedv ejectorand knock-out mechanism for freeing the fini'shed casting from the die.

In the operating cycle of die casting machines in ,general use, the dies are closed, then molten metal is injected into the die cavity and freezes,

the dies are -opened and the finished casting is ejected from the die cavity. Where necessary the operating cycle also includes the 'projection The invention may be incorporated invarious types .of well known die casting machines and is especially adapted ifor use with relatively movable dies having a vertical parting line as shown.

into and subsequent retraction from the die cavity of one or more cores. In the separation of the dies the casting sticks to the cooler die surface but lthe bond is broken by the action of the ejector. However, the casting also sticks to the surface of the ejector exposedin the die cavity during the casting operation and needs to be removed manually after beingv ejected from the die. This manual removal is performed by the workman' after the completion of each operating cycle and according to usual practice the workman with a pair of long handled pliers steps up to the parted dies .and with proper caution inserts the pliers, takes' hold vof the hot casting, dislodges it from the ejector and lifts it out andy deposits it in a suitable receptacle.-

It is an object of the present invention to elim- I inate the manual operation of removing the'nished 4casting and thereby reduce the hazard, ef-

fort and timer involved by providing mechanism not only to eject the finished casting but to free it completely so that it drops. automatically from the machine at the end of the cycle andenables the next casting operation to proceed without delay. Y I i A further object of the invention is. to provide a mechanical 'knock-out device operatively connected with the cooperating vdie blockslforfactuation upon relative die movement to project a member between the separated dies and behind the ejected castings and impart a nal lateral movement to the member to strike or push against the casting and break it loose from the ejector.

Other objects and advantages will becomes ap- `,parent-during lthe course of the following specification having reference c to the accompanying drawings wherein Figure l is a side elevation of a fragment lof a die casting machine having the invention applied thereto; Figure 2 is an enlarged view, partly in section,`showing the relation of the parts', with the dies in closed position; Figurel 3'illustratesfthe relation of the 'par-ts'with .thedies in'fullyl opened position and Figure 4 is a sectional view taken on line l-l of Figure 2.

' metal is injected into the cavity and the dies for example, in United States Patent No. 2,145,- 956 tc Stern. As illustrated in the drawings such machine consists essentially of a vin vable die block I and a stationary die block 2,2 the latter having a sprue opening for receiving molten metal from the nozzle 3 of the injection mechanism associated with a melting pot. jlhel stationary die block 2 is bolted rigidly'to an upright or standard 4 projecting upwardly from the frame of the machine and the movable die block I is mounted on reciprocatory carriage 5 slidably supported on a series of horizontal guide rods 6 'fastened at opposite ends in the upright v4 and a similar frame upright 1. Suitable loperating mechanism for the carriage 5, such asa piston motor, is connected to the c arriage by -type of die cavity and the shape to be castland,

that the ejector nose lllustrated'is that usually employed when the die is formed with multiple cavities. The remote end of the ejector 9 is connected with suitable operating mechanism, such as a piston motor indicated at Il.

The actuation of the ejector, the .die carriage and the metal injecting mechanism are automatically controlled for actiony in timed sequence. After the dies have been closedv the then are movedto open position, the finished castingbeing carried away in the movable die. Asthe parting of the dies is inprogress the ejector pin ,9 moves forward and pushes the f ca sting out of the die cavity'with the casting remaining suspended and bonded thereon. Ac-' cording to the present invention automatic acting means is added to the machine to' engage the ejected casting and break it loose from the ejector surface. This enables the finished casting -to drop from between .the parted dies so 'that the casting cycle may be again set in motion without delay. The nished casting falling from the die drop into a suitable receiver which, as indicatecfln thev drawings, may consist of an inclined chute I2 on which the castings slide lat-- erally from the machine. Optionally an endless conveyor belt may be provided to catch the dislodged castings and carry them from thema-v chine. Where quenching is desired the chute may lead to a suitable tank from which the castings are conveyed to the next operation.

The knock-out member illustrated in the drawings includes a reciprocating rod I3 located wholly beyond the diesduring the casting operation. It a is mounted in. a suitable guide block assembly Il supported on one of the lateral faces of the movable die block I. The guide block Il also carries a bearing shaft I6 for a pair of gears I6 and II arranged side by side and keyed or pinned together for unison rotation. The teeth of the gear I8 are in mesh with mating teeth on the knockout rod I3 while the gear IT is engaged by a reciprocating rack I8 guided in a slot in the block I4 and secured at .its end to a bracket I9 on the stationary frame upright 4. Through this operating connection relative motion of the dies is transmitted to the knock-out rod I3 and as the dies are separated ther beveled nose 20 on the inner end of the rod I3 is projected into the space between the dies for engagement with the ejected casting.

In the initial engagementr the projectedA end 20 is located behind the ejected casting, as indicated by the broken lines in Figure 3. The straightlineimotion of the rod I3 is effected by its bearing engagement in the slot of the guide block I4 together with the spring pressed follower 2I,

.as seen particularly in Figure 2. This guide slot f is relieved or enlarged at opposite ends, the en-4 the guideblock I4. The camming 'abutment 23 being in the path of the abutment 22 upon inthe ejector.

from/the parting line for inspection and handling of the parts as was necessary heretofore.

I claim:

. 1. For use .out of the cavity, means to separate the casting from the ejector mechanism including a rack bar fixed to one of said parts, a pair of intercom' nected gears rotatably carried by the other of said lseparable parts with one of the gears engaged by said. rack b'ar for rotation incident to relative movement of said parts,va reciprocatory bar having rack teeth engaging the other of said gears andbeing arranged for projection behind an ejected'V casting and guide means for the last mentioned bar arranged to cant the bar near its limit of travel for striking the casting loose from 2. A die casting'machine'having in combination with separable dies and an ejector device tomove a casting out of the die cavity, of a knock-"out lever for projection behind and striking engagement with the ejected casting, guide means carried-fbyfone of the dies for mounting said lever .'and motion transmitting gearing operatively connecting said lever with the other die for moving said leverco-incidentally `with relative die movement. r

3. A die casting machine having in combination with separable dies and an ejector device to movea casting out of the die cavity, of a knockout member to be projectedl behind an ejected casting, guidemeans for said member carried lby one of the dies. operativeconnections between said member Aand the other die for imparting movement to the membenthrough relative die movement, Iand camming abutments on the guide and member respectively, adapted for engagement in the projected position of the member to cant the member into striking engagement with the casting.

4. In a die casting machine, a pair of separable dies, an ejector to push a casting from the die cavity, a toothed rack fixed in relation to one4 of the dies, a gear element carried with the other ward projection of the rod \I3 tilts the rod and causes the inner end 20 to exert a push on the ejected casting and knock it loose from the ejector in the manner illustrated in Figure 3. occursas the dies reach the end of their parting travel, and with the casting removed the dies can be closedv at once for the next casting operation. As the dies move toward closed position the move'- ment is transmitted to the knock-out lever I3 causing it to be retracted beyond the mating faces of the dies. A In order that the operator may remain at thecontrols at the rear of the machine, a suitable mirror or reflecting surface can be positioned op- .posite the parting line and at proper angle to enrable the operator to see between the dies when knock-out action without leaving the control sta-l tion. and there is eliminated the walking to and This 'dies to open an die in mesh with said rack, a second gear element drive connected with the first gear element and a slidable rack in meshl with the second gear element and arranged for projection into the space between the dies upondie separation to engage an ejector supported casting 'and break its bond to the ejector. l

5. In a diefcastingmachine, relatively movable close a die cavity, an ejector associated there ith, a knock-out device to` free an ejector supported casting from the ejector, means carried with one of the dies to guide the knock-outdevice and means operatively connecting the other die and said knock-out device 4to impart motion thereto upon relative die movenient.- I

6. In a die casting machine having relatively movable dies and an ejector for pushing a completed casting out of the die cavity, a knock-out device movably mounted on one of the dies for freeing the casting *from the ejector, motion transmittingl mechanism operatively connected to the other die and varranged to impart relative die movement-to the knock-out device for the actuation thereof. 1

l 1 l LUCIAN RING.

with a diel casting machine having

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