US2485290A

US2485290A - Die casting machine

Info

Publication number: US2485290A
Application number: US722871A
Authority: US
Inventors: Alfred F Jelinek
Original assignee: CLEVELAND AUTOMATIC MACHINE CO
Current assignee: CLEVELAND AUTOMATIC MACHINE Co
Priority date: 1947-01-18
Filing date: 1947-01-18
Publication date: 1949-10-18
Anticipated expiration: 1966-10-18

Description

Oct. 18, 1949. j lN K 2,485,290

DIE CASTING MACHINE Filed Jan. 18, 1947 5 Sheets-Sheet l INVENTOR.

ALF/RFD fi' JEL/NEK 18, 1949- A. F. JELINEK DIE CASTING MACHINE 5 Sheets-Sheet 2 Filed Jan. 18, 1947 INVENTOR. ALFPED EJEL/NEK,

Oct. us, 1949. F; J LINEK 2,485,290

DIE CASTING MACHINE Filed Jan. 18, 1947 3 Sheets-Sheet s IN VEN TOR. ALFPEDFJEL /NK Patented Oct. 18, 1949 U NI T E D STATES QFFTI.

DIE CASTING mounts 2 Alfred F. Jelinek, Cleveland; (Elliio, assignor to The- Cleveland Automatic Machine company -Cleve land, Ohio, a corporation'of Ohiov Application January 18, 1947; Serial No. 722,871

This invention relates generally todie casting machines. of the horizontally movable die typ and more specifically to improvements in the support for the die plates therein.

die casting machines of the foregoing type, thefiie parts are supported upon two heavy rigid vertical plates,'one of which is stationary during operation of the machine, the other of which is mbunte'd for retraction relative thereto in order to "facilitate separation of the dies. It is customary in machines of this character to support the, movable plate on a'jplura'lity of guide bars disposed in parallel relation to the bed of the machine and mounted adjacent the opposed ends thereof. In prior art devices difiiculty has been encountered in maintaining alignment of the two die members due to the deflection of the guide bars. under the combined weight of the die and movable plate. In many instances, the guide bars have been bowed to such extent as to inhibit registration of the die 'parts or intimate engagement of the mating faces thereof.

The primary object of this invention resides in the provision of a structure which will assure alignment of the die parts at all times throughout the life of the machine. To this end, the movable die plate is onstructed so that the major portion of the weight thereof is imposed upon the bed of the machine and the guide bars are relieved from any function other than that of maintaining the movable die member in aligned relation with its companion part.

Another object of the invention is to provide a support for the movabledieparts which will facilitate adjustments thereof to compensate for wear or the replacement of worn parts-without dismantling the movable plate assembly.

A further object of the invention resides in the provision of a load supporting structure that may be readily interposed between the bed and movable die plate in machines of a like character.

Other objects and advantages more or less ancillary to the foregoing and-the manner in which all the various objects are realized will appear in the following description, which considered in connection with the accompanying drawing's, sets forth the preferred embodiment of the invention.

In the drawings:

Fig. 1 is a side elevation of the improved die casting machine illustrating the major elements thereof;

Fig. 2 is a section taken on the line 2-2 of Fig. 1 showing a general arrangement of the toggle mechanism;

2 Claims. (01. 22-92 Fig. 3 isa sectiontaken on the line 4-4- ofFig. 1 showing the improved rod supporting structure embodying the present invention;

Fig. 4 i'sa fragmentary section through oneoi the improved rod supporting assemblies; and

Fig. 5 is a perspective view of one of the ad'- ju'sti-ng'wedge blocks.

One die casting machine within which-theimproved supporting structure may be incorporated is-described in U. S. Patent No, 2,334,372, issued to Abbottetal. on November 1 6', 1943. The-prese'nt invention is illustrated and described as a plied to the machine of the aforesaid patentthough certain structural details thereof, which are not directly pertinent to the improved support, have -be'enom'itted herein.

The bed ll! of the ma'chin'e is preferably cons'tructed from fabricated sheet steel members H having ways [-2- mounted thereon. The forward end of the machine is provided with a stationary die supporting plate l3 which cooperates with the movable die supporting plate hi to support. the die parts D. The opposed end of the ma-- chine is formed with a second stationary plate I 5, both of "the stationary plates being bored ad'- jacent the corners thereof for the support of guide bars 16. The die plate M is 'apertured for sliding engagement upon the bars and is preferably provided with elongated bosses ll circum ambient the bores to increase'thewearing surface and assure the stability of the plate. A toggle mechanism 2|] is provided to elfect the reciprocation of the die plate l4 and holdthe die parts in impinged relation with each other duringthe casting operation. The toggle mechanism is actua-ted by push rod 2i connected to a pistonan'd cylinder assembly of conventional ior-m. Admission of fluid alternately to one or the other end of the cylinder advances or retracts the movable die plate at the proper time during the operating: cycle of the machine. To this end, a pumping driven by a prime mover, (not shown) supplies fluid under pressure through a control valve 23! and conduits 24 to the cylinder as required. The ways lZ-areformed with T-slots 21 (Figs. 3 and 4 for the reception of T-headed bolts 28 mounted in the base of the plates I3 and 15.

As described in the Abbott patent referred toabove, it is customary to provide a cylinder 29 having a piston therein for actuating a plunger in the molten metal supply system to inject molten metal under pressure into the die cavities. Cylinder 29 may be adjustably mounted on a pair of rods 25 as described in the aforesaid Abbott patent, the details of the mounting forming no part of the invention. A blower, furnace and melting pot, housed within a chamber 30, are provided to reduce the metal to a molten state. The latter parts are not shown in detail herein since they form per se no part of the present in vention. The cylinder 29 is connected by suitable conduits 32 to control valves 33 indicated schematically in Fig. 1. A tank 34 containing liquid under the pressure, such as nitrogen, is customarily employed for actuating the piston in the cylinder 29. When the control valves 33 are operated at the proper time during the operative cycle of the machine, the piston in the cylinder 29 effects the rapid injection of a metered amount of molten metal into the die cavities.

In order to relieve the guide bars iii of part or all of the load except that exerted in the exercise of their guiding function, the upper faces of the central portions of the ways l2 have secured thereto by means of screws 39 a pair of hardened wear plates 40 which are disposed in a common horizontal plane and surface ground parallel to the axis of the guide bars 16. As illustrated in Figs. 3 and 4, the base of the movable die plate I4 is formed with inclined corners M which are engaged with bronze saddles or supporting blocks 42, having flat bottom surfaces for sliding engagement with the wear plates 40 and upper inclined surfaces 43 congruent to the associated surfaces 4| in the die plate. The vertically disposed ears or side walls 41 (Fig. of the blocks are formed for abutting engagement with the opposed faces of the plate in order to effect the retention of the blocks against longitudinal displacement during the reciprocative movement of the plate.

The forward face of each block 42 is tapped for the reception of cap screws 44 for the support of a plate 45 having a clearance hole in the central portion thereof to receive a draw bolt 46 threaded in side wall of the die plate 14. With this structure, the draw bolts 46 may be adjusted until die plate is suitably elevated to relieve the load upon the guide bars and permit the plate to move freely thereover. Obviously, if the blocks are adjusted too far inwardly, the die plate 14 will bear against the bottom of the guide bars and undesirable wear and binding will occur. Likewise, if the blocks are withdrawn too far, the weight of the die plate will be imposed upon the guide bars and will cause them to sag or bow characteristic of the prior art devices. In the initial construction of the machine, dial indicators may be employed to measure height and parallel relation between the guide bars and the hardened plates 49. A like procedure may be followed thereafter in adjusting the Having described in detail one embodiment of the present invention, it will readily be recognized that a simple, yet highly effective structure, has been provided to convert the action of the somewhat erratic machines of the prior art into a machine which is dependable, accurate and capable of maintaining alignment of the die members, irrespective of wear.

Although the foregoing description is necessarily of a detailed character, in order that the invention may be completely set forth, it is to be understood that the specific terminology is not blocks, the dial indicators or other measuring instruments being used in this case, however, to check the deflection of the bars 15. With this construction, the guide bars serve to perform the function of dowels rather than load carrying members; hence, the die members will be maintained in aligned relation with each other and the parting line marking on the die castings will be minimized. The wear plates 40 may be removed, replaced or resurfaced if objectionable wear is encountered. Being of simple, easilymachined construction such replacement or resurfacing may be done economically.

intended to be restrictive or confining, and that various rearrangements of parts and modificationsOf detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

What I claim is:

1. In a die casting machine, a bed, a stationary die plate supported by said bed, a bracket supported by said bed, guide rods supported by said die plate and bracket, a movable die plate slidably mounted on said guide rods, wear plates hay ing a flat upper surface, means removably mounting said wear plates on said bed for slidably supporting said movable die plate, and shoe means mounted on said movable die plate for engaging said wear plates to relieve said guide rods of the weight of the movable die plate, said shoe means being adjustable to increase the effective vertical dimension thereof so that the apportionment of the load supporting function between the guide rods and the wear plates may be controlled.

2. In a die casting machine, a bed, a stationary die plate supported by said bed, a bracket supported by said bed, guide rods supported by said die plate and bracket, a movablev die plate slidably mounted on said guide rods, a pair of wear plates having fiat upper surfaces formed on said bed for slidably supporting said movable die plate, means removably attaching said wear plates to the bed, there being a beveled bearing surface formed on opposite sides of said movable die plate, and beveled shoe means on said movable die plate for engaging said wear plates to relieve said guide rods of the weight of the movable die plate, said shoe means being adjustable to increase the effective vertical dimension thereof so that the apportiomnent of the load supporting function between the guide rods and the wear plates may be controlled.

ALFRED F. J ELINEK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS