|Publication number||US3292214 A|
|Publication date||Dec 20, 1966|
|Filing date||Mar 17, 1964|
|Priority date||Mar 25, 1963|
|Publication number||US 3292214 A, US 3292214A, US-A-3292214, US3292214 A, US3292214A|
|Inventors||Siegfried Schindler, Werner Battenfeld|
|Original Assignee||Battenfeld Fa Geb|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (3), Referenced by (10), Classifications (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Dec. 20, 1966 w. BATTENFELD ETAL 3,292,214
DIE-CASTING MACHINE WITH BELL CRANK DRIVE Filed March 17, 1964 5 Sheets-Sheet l /NVENTOFS 1% M w w WM Wm X f r Deb. 20, 1966 W.BATTENFELD ETAL 3,292,214
DIE-CASTING MACHINE WITH BELL CRANK DRIVE Filed March 17, 1964 i5 Sheets-Sheet 2 Dec. 20, 1966 w. BATTENFELD ETAL 3,
DIE-CASTING momma WITH BELL CRANK DRIVE 5 Sheets-Sheet 5 Filed March 17, 1964 WVEwv/Ps m M Dec. 20, 1966 w. BATTE NFELD ETAL 3,292,214
DIE-CASTING MACHINE WITH BELL CRANK DRIVE Filed March 17, 1964 5 Sheets-Sheet 4 1966 w. BATTENFELD ETAL 3,
DIE-CASTING MACHINE WITH BELL CRANK DRIVE Filed March 17, 1964 s Sheets-Sheet s United States Patent 3,292,214 DIE-CASTING MACHINE WITH BELL CRANK DRIVE Werner Battem eld and Siegfried Schindler, Meinerzhagen, Germany, assignors to Firma Gebruder Battenfeld, Meinerzhagen, Germany, a corporation of Germany Filed Mar. 17, 1964, Ser. No. 352,519 Claims priority, application Germany, Mar. 25, 1963, B 71,280 2 Claims. (Cl. 1830) The present invention relates to a die-casting machine with a bell crank drive for the working of thermo-plastic artificial material, whereby, for the closing and opening movement of the mold, as well as for the working stroke and return stroke of the die-casting piston, a single drive only is provided, the driving connecting rod of which is pivotally connected with pairs of bell-cranks of diiferent lengths, of which the longer pair of bell-cranks engages a cross-traverse, which connects two longitudinal longerons carrying the mold carrying plate for a rigid locking of the mold, while the shorter pair of bell-cranks is pivotally connected with a piston carrier plate. A pressure pillow built into the piston carrier plate retards the movement of the die-casting piston, so that the die-casting mold is rigidly locked, before the movement of the diecasting piston is terminated.
The present invention differs in an advantageous manner substantially from a bell-crank drive casting machine in accordance with the general notion for working of thermoplastic artificial material by the fact, that, on the one hand, all three bearings of the pairs of cranks are disposed movably relative to the drive and that, on the other hand, at the start of the mold closing movement, the driving connecting .rod and the longer pair of bellcranks, engaging a longeron cross-traverse, are disposed generally in the same direction and the driving connect ing rod exerts at first pressure upon the longer pair 01 bell-cranks, while at the start of the opening movement of the mold the driving connecting rod is disposed nearly in the same direction with the shorter pair of bell-cranks, engaging the piston carrying plate, and exerts at first a pulling effect upon the shorter pair of bell-cranks.
It is, therefore, one object of the present invention to provide a die-casting machine with a bell crank drive, wherein the die-casting mold is at first completely closed, before the actual casting process starts and is mechanically locked before the casting process is terminated, and in particular, in such manner, that at first the longer pair of bell-cranks, causing the closing of the die-casting mold parts, is operated slidingly by the driving connecting rod, and only after the closing of the die-casting mold the working stroke of the piston carrier starts. Since the force of the pressure pillow built into the piston carrier is adjusted to be smaller than the force with which the piston carrier is moved, a retarded movement speed of the die-cast piston is caused relative to the piston carrier, due to the resistance of the die-cast mass in the plastification cylinder, so that the die-cast process is terminated due to the release of the tension of the pressure pillow after the locking of the die-cast mold and a standstill of the driving system and the required after-pressure is maintained. In addition, during the opening process, the pair of bell-cranks engaging the piston plate is at first operated in a pulling manner during the opening process, so that the piston returns before the mold opens.
For the practical realization of the present invention, a crank drive is used, the driving connecting rod of which engages the center joint of the pairs of bell-cranks and, thereby, the center axis of the drive crank is disposed on the side of the die-cast mold in a plane slightly in front of the center joint of the double-armed levers.
By such arrangement, it is brought about that the crank pin connecting the connecting rod with the drive disc is disposed at the start of the closing movement on the side of the driving disc opposite the shorter pair of bell-cranks, so that the connecting rod is disposed substantially in the same direction with the longer pair of bell-cranks, whereby it is achieved, that this pair of double-armed levers is at first displaced and thus also the mold is at first closed, prior to the start of the diecasting process by means of the die-cast piston. On the other hand, the crank pin, caused by the rotationof the driving disc, is disposed at the start of the opening movement on the side of the driving disc opposite the longer pair of bell-cranks, so that the connecting rod and the shorter pair of bell-cranks are disposed about in the same direction, whereby it is brought about that at first, it operates in a pulling manner, thus withdrawing at first the die-cast piston, before the mold opens.
With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:
FIGURE 1 is an axial section of the die-casting machine designed in accordance with the present invention, and in particular, shown at the start of the closing movement;
FIG. 2 is an axial section similar to that shown in FIG. 1, showing the mold in a closed position and also after the completed die-casting process;
FIG. 3 is a top plan view of the die-casting machine, showing the mold in its closed position and indicating the position after completion of the die-casting process;
FIG. 4 is a fragmentary section of the machine within the range of the die-casting piston, likewise in the spraying position; and
FIG. 5 is a fragmentary section similar to that shown in FIG. 4, indicating the completely open position.
Referring now to the drawings, the die-casting machine designed in accordance with the present invention comprises a frame 10 having mounted therein a crankdrive, a driving disc 12 of which is mounted in a hearing 11 and is driven by a worm gear 13. A driving connecting rod 14, which is connected with the driving disc 12 by means of a crank pin 15, engages pivotally a center joint 16 of two pairs of bell-cranks 19 and 20, of which the pair of bell-cranks 19 is longer than the pair of bellcranks 20. The pair of bell-cranks 19 in turn is con nected with a cross traverse 21 by means of the pivot 17, which cross traverse 21 connects rigidly two longitudinal longerons 22. These longitudinal longerons 22 are slidingly guided in bearings 23 and support a mold carrying plate 25 at their ends disposed remote from the cross traverse 21.
During the rotating movement of the driving disc 12 in clockwise direction, the cross-transverse 21 is displaced in the direction of the arrow, shown in FIG. 1, whereby the mold carrying plate 25 with a mold 26 is moved towards the spray side of a tool carrying plate 27 and the mold is closed. A nozzle 28 seals itself thereby against the heat cylinder side of the spraying mold. The closing movement is limited by the abutment of the nozzle plate 27 on a heating cyinder 29. Since now the 'crank pin 15 did not reach yet the highest position, a piston carrier pate 30, into which a hydraulic pneumatic pressure pillow is built in, moves in the direction of the arrow B (FIG. 2). A spraying piston 31 presses the spraying material received in front thereof through a plastification cylinder 32 into the mold 26.
Since now during this total performance, the moving speed of the drive in the direction of the arrow B is greater than that of the movement of the piston 31, a piston 31a of the pressure pillow is not operative. Upon termination of the drive movement, the links 18, 16 and 17 of the pair of bell-cranks 19 and 20 are in the position shown in FIG. 2 of the drawings, so that the mold is mechanically locked. 'I he piston carrier plate 30 comes then to a standstill at an abutment 33 of the heating cylinder plate, so that the mentioned rigid locking comes about.
It now the mechanical locking is obtained, the piston 31 terminates, due to the efiect of the pressure pillow or also by the force of a spring, the filling of the mold. Upon correct dosage, by means of a dosing device 34, a material surplus will be present in the plastification cylinder 32, so that the pressure pillow does not engage the abutment on the piston side and, thereby, maintains the required pressure for the spraying process.
After the filling of the mold, the crank pin of the driving disc 12 moves again downwardly from its highest position, however, now on the opposite side of the disc 12, so that the connecting rod 14 is disposed in about the same direction with the shorter pair of bell-cranks 20, and at first, effects the latter in a pulling manner during the opening movement and by withdrawing the piston carrier plate 30, while during the closing movement opposite conditions prevail, so that then first the longer pair of bell-cranks 19 is operated.
It is to be understood that the shown and described embodiment constitutes merely an example for the realization of the present invention, without being limited thereto, rather within the scope of the present invention, other embodiments and applications are possible. This relates in particular to the construction of the drive, which can be designed also as a hydraulic drive, since it is only essential that the driving connecting rod can be effective in two directions.
1. A die-casting machine for the working of thermoplastic artificial material comprising a frame,
a crank-drive including a connecting rod mounted in said frame,
two pairs of bell-cranks of different lengths pivotally connected at a center pivot with the free end of said Connecting .rod,
said crank drive constituting the sole drive for the closing and opening movement of a mold as well as for the working stroke and the return stroke of a feeding? piston, a cross-traverse pivotally connected with the longer one of said pairs of bell-cranks,
two longerons connected by said cross-traverse and carrying a mold carrying plate,
a piston carrier plate having a piston reciprocating therein and pivoted to the shorter of said pairs of bell-cranks,
a pressure pillow built into said piston carrier plate and retarding the axial movement of said piston, so that the die-casting mold is rigidly locked, prior toithe termination of the movement of said piston,
all three bearings of said pairs of bell-cranks are movably disposed relative to said drive, and
at the start of the mold-closing movement the driving connecting rod and the longer of said pairs of bellcranks being disposed substantially in the same direction and exerting a pushing pressure upon the longer of said pairs of bell-cranks, while at the start of the mold opening movement said driving connecting rod and the shorter of said pairs of bell-cranks being disposed substantially in the same direction and ex-.
erting a drawing effect upon the shorter of said pairs of bell-cranks.
2. The die-casting machine, as set forth in claim 1,2
References Cited by the Examiner,
UNITED STATES PATENTS FOREIGN PATENTS 5/1957 France. 1/ 1929 Germany.
J. SPENCER OVERHOLSER, Primary Examiner.
W. L. MCBAY, Assistant Examiner.
1/1964 Rees 18-3Q
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|U.S. Classification||425/592, 425/451.6, 425/594|