US2033036A - Die casting machine - Google Patents

Description

March 3, 1936. T. c. KORSMO DIE CASTING MACHINE Filed Aug. 14, lss

2 Sheets-Sheet l Zhwentor (It tornegs March 3, 1936.

T. C. KORSMO DIE CASTING MACHINE Filed Aug. 14, 1935 2 Sheets-Sheet 2 Zinnentor (Ittomegs Patented Mar. 3, 1936 UNITED PATENT OFFEQE DIE CASTING MACHINE Application August 14, 1935, Serial No. 36,226

14 Claims.

This invention pertains to die casting apparatus and particularly to mechanism for actuating cores, slides or similar parts of die casting machines.

A particular object of the invention is to provide simple and efficient mechanism in a die casting machine for eifecting automatic insertion and withdrawal of the core or cores in the die during operation of the machine. The core actuating mechanism is adapted for use with practically all types of cores, but is especially designed for pulling long cores requiring considerable power to remove them from the casting in the die cavity.

A further object consists in so designing the core pulling mechanism that a jerk or a succession of jerks is imparted to the core at the start of the pull to work the core loose from the casting, after which it is fully removed therefrom.

Another important object is the provision for operation of the core by its actuating means so as to preclude the setting up of undesirable strains in the actuating means or the core, or binding of the core in the die. Manually adjustable means also are included for insuring accurate positioning of the core in the die. Other objects will appear hereinafter.

A practical embodiment of the invention now in use, is disclosed in the accompanying drawings, wherein:

Figure l is a front elevation of a portion of a die casting machine including the improved core actuating means, the die being shown closed and the core projecting into the die cavity. Certain of the parts are broken away or shown in section to reveal the details more clearly.

Figure 2 is a section on line 2-2 of Fig. 1 with the parts in the same position.

Figure 3 is a front elevation similar in part to Fig. 1 and showing in dotted lines the successive posit-ions assumed by the core actuating element of the core actuating mechanism as the core is inserted or withdrawn; and

Figure 4 is a horizontal section through a corner of the core actuating element, showing one of the cam engaging rollers carried thereby.

The improved core actuating means comprising the present invention are shown in the accompanying drawings as applied to a die casting machine of the type set forth in my prior Patent No. 1,607,677, dated Nov. 23, 1926. In this machine there is a stationary die half 6 which is suitably mounted on a hot plate I forming part of the frame of the machine. The movable die half 8 is mounted on a carriage 9 10- cated on guide rods I I, the latter extending from hot plate 7 to the opposite or driving end of the machine (not shown). Carriage 9, together with die half 8, is adapted to be moved back and forth on guide rods II by suitable mechanism (not shown) to open and close the die. A pair of brackets III, I suitably secured to the upper corners of die half 8 and having adjustable pillow blocks III, II! engaging guide rods II, II serve further to support the die part in its movements.

When the die is closed, as shown in Fig. 1,

suitable mechanism (not shown) brings the goose-neck nozzle I2 into communication with an opening in the under side of the die, and molten metal is forced from the goose-neck nozzle into the mold cavity. In the die illustrated, the cavity I3 is formed by a recess I4 in movable die half 8 into which projects a block I5 attached to the fixed die half 6. Cavity I3 is designed to produce a casting I6 of tray-like shape having a cylindrical chamber I6 at one side. This chamber I 6' is formed by a comparatively long, cylindrical core I! depending into the die cavity from the upper part of movable die half 8. The particular form of die shown for producing the specially designed casting I6 is for purposes of illustration only. It will be obvious that the core actuating mechanism hereinafter described may be used in making practically any type of casting and also for operating practically all types of cores, slides and analogous members mounted in the die. The upper portion of core I1 is fitted for reciprocation in a passage I8 leading from the die cavity. This passage communicates with a larger cylindrical recess I9 in the top of the die half into which is also fitted for free reciprocation the lower reduced cylindrical end 2| of a vertically slidable head 22. Core I7 is securely mounted in the lower end of slidable head 22 so that these parts, which make up the core assembly, may be moved as a rigid unit. Shoulders 23 and 24 on the core assembly described, engage the bottom of recess I9 and the top of the die, respectively, to limit the insertion of the core into the die cavity.

Core head 22 is arranged for vertical reciprocation between a pair of standards or slides 26, 21 rigidly mounted on top of movable die half 8. These standards are formed with similar base portions 28, 29, respectively, having openings through which extend machine screws 3| to secure the standards firmly to the die part. A vertical rib 32 on slide 21 further strengthens this element.

part. At the upper ends the slide members are tied together by a cross bar 33 secured to the slides 26, 21 by machine screws 34, 35. Slides 26, 21 have grooves 36, 31 on their inner faces in which engage tongues 38, 39 on core head 22, thereby providing means for properly guiding the core assembly during its upward and downward movements as the core I1 is inserted and withdrawn during the operation of the machine.

The means for automatically withdrawing the core as the die is opened and for inserting the core as the die is closed will now be described. Core head 22 has a transverse opening 4| therein near its upper end in which is secured a pivot pin 42 by means of a set screw 43. The extremities of pin 42 project beyond the sides of core head 22 and pivotally support a pair of parallel rocker arms 44, 45 each of which is provided intermediate its ends with an opening 46 to receive the pivot pin. As shown in Figs. 1 and 2, rocker arms or levers 44, 45 extend along the front and rear faces of standards 26, 21 and at their extremities are connected firmly together by cross bars 41, 48 secured to the rocker arms by machine screws 49. Rocker arms 44, 45 and cross bars 41, 48 thus form a rigid rectangular frame or lever element 50 pivotally mounted on the upper end of core head 22 by means of which the core head and its attached core H are adapted to be actuated by certain cam means described later.

A pair of anti-friction rollers 5| (only one of which is shown) is mounted on the hot plate end of the core actuating element 5|), and a similar pair of rollers 52, 52 on the opposite end of the These rollers are located on the outer faces of the rocker arms 44, 45 and are adapted for engagement with the cam means referred to.

All of the rollers are alike and are similarly mounted; hence only one, front roller 52, will be described. Referring particularly to Fig. 4, it will be seen that the roller proper consists of a ring through the opening 53 of which extends a stub shaft 54 mounted in an opening 55 in rocker arm 44. Shaft 54 has a head 56 and the roller has a corresponding rabbet 51 whereby the roller is secured for rotation on the shaft and there is eliminated any projection of the shaft beyond the side of the roller. An annular groove 58 in stub shaft 54 is engaged by a set screw 59 in the end of the rocker arm to hold the shaft in place. A look nut 66 secures the set screw.

Located above the die and extending from hot plate 1 to the driving end of the machine, to which they are connected, is a pair of stationary combination bars 6|, 62. These bars, which are adjustable towards and from each other, carry on their inner faces the cam means with which the two pairs of rollers 5|, 5| and 52, 52 coact during opening and closing of the die to operate lever element 50 and thus actuate core I1. The bars also carry certain manual position adjusting means for the core.

Since the cam means and the manual position adjusting means referred to are duplicated on each of the combination bars 6|, 62 only those on rear bar 62 will be described. Secured to the inner face of bar 62 by means of screws 63 are two pairs of cam blocks 64, 66 and 61, 68. Blocks 64, 66 are spaced apart to provide a cam groove 69 towards the hot plate 1 and blocks 61, 68 are spaced to form a partially similar cam groove 16. As shown in Figs. 1 and 2, rollers 5|, 5| at the hot plate end of lever element 50 are located in the opposed and alined grooves 69, 69 on the pair of bars 6|, 62, while rollers 52, 52 at the opposite end of lever element 56 are located in the opposed and alined grooves 16, 10.

Cam groove 69 consists of a lower horizontal portion 1|, a short inclined portion 12, a short horizontal portion 13, an extended inclined portion 14 and an upper horizontal portion 15. Cam groove consists of a lower horizontal portion 1| arranged in horizontal alinement with portion 1| of groove 69, although somewhat shorter than the latter, an inclined portion 12', a horizontal portion 13 somewhat longer than portion 13 of groove 69, an inclined portion 14 paralleling portion 14 of groove 69, and an upper horizontal portion horizontally alined with portion 15 of groove 69.

From Figs. 1 and 2, and also full line position A of Fig. 3, it will be seen that the parts are so proportioned that, when the die is in normal closed position and the core inserted ready to shoot a casting, rollers 5|, 5| at one end of the core actuating element 59 are located in the lower horizontal portions 1|, 1| of cam groove 69, 69, and rollers 52, 52 at the opposite end of the lever element are disposed in the corresponding lower portions 1|, 1| of cam grooves 16, 10.

At this time, actuating element 56 is in substantially horizontal position, and engagement of the upper edges of cam grooves 69, 16 with rollers 5|, 52 has forced core head 22 and the attached core downwardly so that shoulders 23 and 24 on the core assembly engage die part 8 as described. This limits downward movement of the core into the die cavity and therefore controls the shape and certain dimensions of the casting being made, as for instance the depth of chamber I6 and the thickness of the lower wall in the case of the casting l6 illustrated in Fig. 1.

In order that accurately dimensioned castings may be produced, provision is made for insuring proper positioning of the core in its lowermost or normal position in the die notwithstanding such inaccuracies or variations as may occur in the sizes or relative location of the several core positioning parts. For this purpose certain duplicate manual adjusting means are located on the combination bars 6|, 62. Only that on bar 62 will be described. As shown in Fig. l the lower edge of a block 16 mounted on the inner face of bar 62 forms the upper edge of portion 1! of cam slot 69 against which roller 5| bears, slot 69 being somewhat wider than the roller. Block 16 is adapted for vertical adjustment and for this purpose is provided with a pair of vertical slots 11 through which extend clamping screws 18 secured to bar 62. Fixedly attached to bar 62 above block 16 is another block 19 having an adjusting screw 80 extending through a threaded longitudinal passage 8| therein. Look nuts 82 secure screw 80 in adjusted position.

With this arrangement, after screws 18 and lock nuts 82 of both of the adjusting means are loosened, screws 86 may be adjusted to force blocks 16 downwardly. This moves rollers 5|, 5| downwardly and actuating element 56 swings downwardly about rollers 52, 52 as a pivot, since the latter fulcrum on the upper sides of portions 1|, 1| of cam grooves 10, 16. As a result, core head 22 is moved downwardly in its slides to position core |1 accurately in the die cavity. Screws 18 and lock nuts 82 arenow tightened so that the adjustment described cannot be disturbed and thus the core will be accurately located in the die each time it closes, preparatory to making a cast- 6.

In describing the operation of the core pulling means, it will be assumed that the die is closed with the core properly positioned therein and that a casting has just been shot as illustrated in Fig. 1. When die half 8 moves to the right to open the die, it carries with it the core assembly, the actuating element 59 pivoted on the upper end thereof, and the slide structure for core head 22. With cam tracks 69, 10 formed as shown, as die half 8 moves to the right, rollers 52, 52 engage upwardly inclined portions 7 l of groove 10, 10 before rollers 5|, 5| reach inclined portions l2, 72 of grooves 69, 69. This swings the right hand end of actuating element 56 upwardly with the rollers 5|, 5| at the opposite end fulcruming on the lower sides of cam slots 69, 69 as illustrated in dotted line position B of Fig. 3. As a result, a sharp, powerful leverage jerk or pull is imparted to the vertically slidable head 22 and its core at the start of the core withdrawing action which effectively serves to work the core loose from the casting.

As die part 8 continues to the right, rollers 52, 52 enter horizontal portions 13, 13 of groove 19, whereupon rollers 5|, 5| engage inclined portions 12, 12 of grooves 69, 69. This causes the left hand end of lever element 50 to swing upwardly with rollers 52, 52 fulcruming on the lower edges of grooves 10, 70. In this manner, lever element 59 is swung into the substantially horizontal position indicated at C in Fig. 3, as rollers 5|, 5| enter portions 13, 13 of groove 69, 69. This results in a second powerful leverage jerk being applied to the core assembly so that the core is completely portions 14', 14' of grooves 16, 10 as die half 8 moves further to the right. This continues the upward sliding movement of core head 22, with lever element 50 remaining in horizontal position, until core I! is completely withdrawn from the casting. Following this movement, rollers 5|, 5| enter horizontal portions l5, 15 of grooves 69, 69 and rollers 52, 52 enter horizontal portions l5, 15 of grooves 10, 10 as indicated in dotted line position D (Fig. 3), whereupon the upward movement of the core ceases. Shortly after this, die part 8 reaches the end of its opening movement.

When die part 8 returns to the die closed position of Fig. 1, core i! will be automatically restored to its exact original position in the die ready for shooting the next casting. During the closing movement of the die the operation of the core actuating means will be the same as in the opening movement, except that the several movements of the parts will be in the reverse order and in opposite directions.

It is an important feature of the core actuating mechanism described that, although powerful pulling action is obtained, this is accomplished at all times by a straight line movement of pull on the core so that the core is not subjected to side strains and. there is no likelihood of the core binding in the die. This is due principally to the floating arrangement of the core actuating element 5!] in the several cam grooves whereby the actuating element may automatically shift or accommodate itself in the grooves and thereby re lieve any binding action tending to take place between the several parts, more particularly between core I1 and the die, and between core head 22 and its slides. In this connection, it will be noted that as each rocking movement is imparted to actuating element 50, either in withdrawing or one or even more than two such pulls may be.

provided for if found desirable. Likewise, although the proportions of lever element 50 indicate an approximately 1:1 leverage ratio, this may be varied of course to suit conditions. The described mechanism is also adapted for use in the operation of slides or other movable parts mounted in the die.

Various changes and modifications other than those mentioned may be made in the mechanism without departing from the scope of the invention except as the same may be limited by the appended claims.

What is claimed is:

1. In a die casting machine, the combination of a support; a die part carried by the support; cam means on the support, said die part and said cam means being arranged for relative movement; a member mounted for movement in the die part; and a lever element operatively engaging said member and also operatively engaging the cam means at a plurality of points, said cam means being constructed and arranged so as to operate the lever element about one of said points as a fulcrum upon relative movement between the die part and the cam means and thereby actuate the movable member.

2. In a die casting machine, the combination of a support; a die part carried by the support; cam means on the support, said die part and said cam means being arranged for relative movement; a member mounted for movement in the die part; a lever element pivotally connected intermediate its ends to said member; and roller means on said lever element engaging the cam means on each side of said pivotal connection, said cam means being constructed and arranged so as to operate the lever element about one of said roller means as a fulcrum upon relative movement between the die part and the cam means and thereby actuate the movable member.

3. In a die casting machine, the combination of a support; a die part carried by the support; cam means, including a pair of cam surfaces, carried by the support, said die part and said cam means being arranged for relative movement; a member mounted for movement in the die part; and a lever element adapted for operation to actuate said member, said lever element being pivotally connected to said member and operatively engaging said cam surfaces, the cam surfaces being constructed and arranged so that, upon relative movement between the die part and the cam means, one of said cam surfaces operates the lever element about a fulcrum on the other cam surface and said other cam surface permits shifting of said fulcrum.

4. In a die casting machine, the combination with a support, a die part mounted for movement thereon and a core or the like arranged for movement in the die part, of stationary cam means on the support; and a lever element pivotally connected to the core and operatively engaging the cam means at a plurality of points, said cam means being constructed and arranged so as to operate the Ie'vereIement about a fulorum-on the cam means upon movement of the die part and thereby actuate the core.

5. In a die casting machine, the combination with a support, a die part mounted for movement thereon and a core or the like arranged for movement in the die part, of stationary cam means on the support; and a. lever element pivoted intermediate its ends on the core and operatively engaging the cam means on each side of the lever pivot, said cam means being constructed and arranged so as to operate the lever element about a fulcrum on the cam means upon movement of the die part and thereby actuate the core.

6. The combination in a die casting machine of a frame; a die part mounted for movement thereon; a movable core or the like in the die part; stationary cam means on the frame, including a pair of cam grooves; a lever element pivoted intermediate its ends on the core; and roller means on the lever element at each side of its pivot and located in said cam grooves for operative engagement therewith, said grooves being constructed and arranged so as to operate the lever element about one of said roller means as a fulcrum upon movement of the die part and thereby actuate the core.

7. In a die casting machine, the combination with a support, a die part mounted for movement thereon and a core or the like arranged for movement in the die part, of stationary cam means on the support; and a lever element pivotally connected to the core and operatively engaging the cam means at a plurality of points, said cam means being constructed and. arranged so as to operate the lever element a plurality of times to impart a succession of movements in one direction to the core upon movement of the die part in one direction.

8. In a die casting machine, the combination with a support, a die part mounted for movement thereon and a core or the like arranged for movement in the die part, of stationary cam means on the support; a lever element pivotally connected to the core and operatively engaging the cam means at a plurality of points, said cam means being constructed and arranged so as to operate the lever element first about one of said points as a fulcrum and thenabout the other point as a fulcrum upon movement of the die part in one direction and thereby impart a succession of movements to the core.

9. In a die castinglmachine, the combination with a support, a die part mounted for movement thereon and a core or the like arranged for movement in the die part, of stationary cam means on the support, including a pair of spaced members having a plurality of pairs of opposed cam grooves; and a lever element pivotally connected to the core and having projections operatively engaging said pairs of cam grooves, said cam grooves being constructed and arranged so as to operate the lever element about certain of said projections as a fulcrum upon movement of the die part and thereby actuate the core.

10. The combination in a die casting machine of a frame; a die part mounted for opening and closing movements thereon; a movable core or the like in the die part; stationary cam means on the frame; and a lever. element pivotally connected to the core and operatively engaging the cam means at a plurality of points, the cam means being constructed and arranged so as to operate the lever element about a fulcrum on the cam means and then move the lever element bodily, or vice versa, upon movement of the die part thereby to actuate the core.

11. The combination in a die casting machine of a frame; a die part mounted for movement thereon; a movable core or the like in the die part; guide means projecting from said die part; a head on said core movably mounted in the guide means; stationary cam means on the frame; and a lever element pivotally connected to said core head and operatively engaging the cam means at a plurality of points, the cam means being constructed and arranged so as to operate the lever element about a fulcrum on the cam means upon movement of the die part and thereby actuate the core head and the core.

12. The combination in a die casting machine of a frame; a die part mounted for movement on the frame; a movable core or the like in the die part; guide means projecting from the die part; a head on the core movably mounted in said guide means; stationary cam means on the frame, including a pair of spaced bars having two pairs of opposed cam grooves; a rocker element pivotally mounted intermediate its ends on the core head; a pair of anti-friction rollers at one end of said rocker element operatively engaging one of said pairs of cam grooves; and a second pair of anti-friction rollers at the opposite end of the rocker element operatively engaging the other pair of cam grooves, said cam grooves being constructed and arranged so as to operate the rocker element about at least one of said pairs of rollers as a fulcrum upon movement of the die part and thereby actuate the core head and the core.

13. The combination in a die casting machine of a support; a die part movably mounted thereon; a movable core or the like in the die part; stationary cam means on the support; an operative connection between the core and the cam means, said cam means being constructed and arranged so as to actuate the core upon movement of the die part; and manually adjustable means acting on said operative connection between the core and the cam means when the die part is in closed position to control positioning of the core in the die part.

14. The combination in a die casting machine of a frame; a die part mounted thereon for movement between open and closed positions; a movable core or the like in the die part; stationary cam means on the frame, including a pair of cam grooves and a manually adjustable member forming part of one of said grooves; and a lever element pivotally connected intermediate its ends to the core and having projections thereon operatively engaging said grooves on each side of the lever pivot, the grooves being constructed and arranged so as to operate the lever element upon movement of the die part and thereby actuate the core, and one of said projections on the lever element engaging said adjustable member when the die part is in closed position to control the position of the core in the die part.

TORBJORN C, KORSMO.

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