Mechanism for the attachment of interchangeable molds in an injection molding machine
OwnerKarl Hehlinventor
Life of this patent
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Abstract
A mechanism for the clamping attachment of interchangeable injection molding dies to the die carrier plates of an injection molding machine featuring a plurality of clamping plungers in axial guide bores of the die carrier plates, each clamping plunger having a clamping nose engaging a clamping shoulder of an oversized back plate of the die half, clamping the latter against the die carrier plate, when it is forcibly retracted by means of a transversely guided wedge rod traversing the clamping plunger and driven by a hydraulic cylinder assembly in a self-locking taper drive configuration. The injection molding dies are insertable and removable in either a horizontal or a vertical direction.
Claims17
A mechanism for the clamping attachment of interchangeable injection molding dies to the die carrier plates of an injection molding machine, which machine has a die closing unit defining a horizontal center axis and including a stationary and a movable die carrier plate with radially oriented parallel opposite die mounting faces for the attachment thereto of a stationary and a movable die half, the movable die carrier plate being guided on a plurality of horizontal tie rods and driven for opening and closing movements along said center axis, the die attachment mechanism comprising in combination:
- at least two axially movable clamping plungers arranged in each die carrier plate in axial guide bores which are located diametrally opposite to the center axis of the die closing unit, the clamping plungers having forward extremities protruding a distance from the die mounting faces of the associated die carrier plates;
- a standardized back plate on the axially outer side of each die half, the back plate having an outer face adapted to be clamped to the die mounting face of the corresponding die carrier plate and radial dimensions which permit radial insertion and retraction of the back plate between the protruding extremites of said oppositely located clamping plungers, in a movement in which the outer face of the back plate moves along the die mounting face of the die carrier plate with minimal clearance, thereby making it possible to insert and attach a closed injection molding die, without the need for axially moving the die carrier plates;
- means defined by the back plates of the die halves and by the associated clamping plungers for clamping each back plate to the die mounting face of the corresponding die carrier plate, when the clamping plungers are retracted in the direction of the die mounting plate;
- and
- means for forcibly retracting the clamping plungers in the direction of the die mounting plate so as to operate said back plate clamping means.
Dependencies are inferred from the claim text.