Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to close mold
Patent
1996-04-23
1998-06-30
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to close mold
425590, 425595, 4254501, 4254519, B29C 4568
Patent
active
057730504
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a mould closing device for injection moulding machines of a type having a fixed mould clamping plate supporting one tool half and a movable mould clamping plate carrying another tool half.
A mould closing device of this type is known from DE 37 18 106 A 1 (construction as shown in FIG. 5), in which the movable mould clamping plate can be propelled in the closing and opening directions by means of spindles supported in the fixed mould clamping plate and in which the closing pressure is built up by means of hydraulic piston-cylinder units which are supported in the fixed mould clamping plate and which act upon the spindles. Where this arrangement is concerned, in addition to the opening and closing travels which have to be performed rapidly, the spindles also assume the full tractive force when the closing force is generated by the hydraulic piston-cylinder units. Therefore, the spindles have to be designed to handle the movement as well as the closing force function, which means that they have to be made relatively heavy.
Furthermore, known from EP 0 381 107 A2 is a mould closing device in which spindles mounted in the fixed mould clamping plate are coupled to the movable mould clamping plate by means of spindle nuts which produce in the opening and closing movements via a rotary drive. Since the closing pressure is built up via hydraulic piston-cylinder units which are braced on the spindle nuts, then here, too, the spindles have to be designed so that they can absorb the tractive forces resulting from the high closing pressure.
SUMMARY OF THE INVENTION
Therefore, the invention is based on the problem of so further developing a mould closing device of the afore-mentioned type while ensuring the high closing pressure by a hydraulic piston-cylinder unit, the movement drive by means of spindles only has to be designed to meet the demands for rapid opening and closing movements.
This object is attained in accordance with the present invention by providing a screw drive mechanism including a spindle having axial ends, with one axial end rotatably supported in the fixed mould clamping plate and another end being received in a spindle nut operatively connected to the movable mould clamping plate, a rotary drive for actuating the screw drive mechanism to effect a travel of the movable mould clamping plate in closing and opening directions, first hydraulic main piston-cylinder units operatively connected to the screw drive mechanism for building up a closing force, wherein the movement of and transmission of force for the movable mould clamping plate during opening and closing is effected during rapid movement solely by the screw drive mechanism, and wherein the main piston-cylinder units include one or a plurality of main pistons and main cylinders which are acted upon for build-up of the closing force by pressurized medium applied by second piston-cylinder units driven by the screw drive mechanism via interposed pressure amplification.
Advantageous further developments and measures according to the invention are indicated in dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in greater detail hereinafter with reference to three embodiments shown in the accompanying drawings, in which:
FIG. 1 shows a diagrammatic longitudinal section through a mould closing device of an injection moulding machine and taken along the line I--I in FIG. 4;
FIG. 2 is a diagrammatic longitudinal section through another embodiment of mould closing device;
FIG. 3 is a diagrammatic longitudinal section through a further embodiment of mould closing device, and
FIG. 4 shows a cross-section taken on the line IV--IV in FIG. 1 and jointly applicable to the mould closing devices shown in FIGS. 1 to 3.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 1 shows a mould closing device for an injection moulding machine and comprising a fixed mould clamping plate 1 with a first tool half 2 and with a movable mould clamping plate 4 carrying the second tool half
REFERENCES:
patent: 4984980 (1991-01-01), Ueno
patent: 5261810 (1993-11-01), Kamp et al.
patent: 5336462 (1994-08-01), Wohlrab
patent: 5345766 (1994-09-01), Leonhartsberger et al.
Feiereisen Henry M.
Krauss-Maffei AG
Mackey James P.
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