Abstract: Injection unit for an injection molding machine to process material, comprising a plasticizing cylinder, a screw, and a screw drive including two electric motors, such that the two motors have an electrically controlled connection to one another, to implement an injection and metering process, such that the two motors can be operated in the same or opposite direction of rotation and with the same or different rotational speed. A space is formed by at least two sleeves which can move relative to one another, and by respectively adjoining plate members, so as to take up lubricating oil, such that the sleeves can slide into one another, and the junctions of the parts which form the space are constructed tight against the environment, at least for lubricants.

Abstract: A device and method for cooling granules, in particular wax granules, for processing in an injection-moulding machine, which has a cavity for receiving the granules and having an inlet opening and an outlet opening, and at least one further opening is provided for supplying a gaseous medium. In the device of the invention, the outlet opening is arranged directly or indirectly at the feed region of the screw of an injection-moulding machine and the cavity is connected to a cold-gas production device. In the process of the invention, the inlet temperature and the outlet temperature of the gas is determined and by determining the temperature difference, the preset theoretical temperature in the cavity is controlled and/or regulated.

Abstract: Injection unit for an injection molding machine to process material, comprising a plasticizing cylinder, a screw, and a screw drive including two electric motors, such that the two motors have an electrically controlled connection to one another, to implement an injection and metering process, such that the two motors can be operated in the same or opposite direction of rotation and with the same or different rotational speed. A space is formed by at least two sleeves which can move relative to one another, and by respectively adjoining plate members, so as to take up lubricating oil, such that the sleeves can slide into one another, and the junctions of the parts which form the space are constructed tight against the environment, at least for lubricants.

Abstract: A method is provided for operating an injection unit of an injection molding machine for metering or injecting material, also to create a back pressure in the melt, or to create a holding pressure on the melt, by means of a screw drive including two electric motors, with a controlled electrical connection to one another, and by means of a spindle-nut combination, such that the two electric motors can be operated in the same direction of rotation or in the opposite direction of rotation. In one embodiment, the two electric motors are operated counter-rotationally to inject the material, or the two electric motors are operated synchronously in their direction of rotation to create a back pressure in the melt or a holding pressure on the melt, a difference rpm being set by means of at least one electric feedback signal.

Abstract: An apparatus to actuate an injection element (1) for injecting a defined quantity of plasticized plastic or the like into an injection molding tool. The injection element (1) is designed as a piston or as a screw and is guided in a guide (2) and moved by an actuation element. The actuation element (3) has a tappet (4), which is guided on a crank plate (5), the crank plate (5) being turned with positional accuracy by a controlled or regulated servomotor (6). The invention provides that, for the return stroke of the injection element (1), a second tappet (7) is present, which is actuated by a second crank plate (8).

Abstract: A device and method for cooling granules, in particular wax granules, for processing in an injection-moulding machine, which has a cavity for receiving the granules and having an inlet opening and an outlet opening, and at least one further opening is provided for supplying a gaseous medium. In the device of the invention, the outlet opening is arranged directly or indirectly at the feed region of the screw of an injection-moulding machine and the cavity is connected to a cold-gas production device. In the process of the invention, the inlet temperature and the outlet temperature of the gas is determined and by determining the temperature difference, the preset theoretical temperature in the cavity is controlled and/or regulated.

Abstract: A method for injecting plastic material or another injectable material into an injection molding tool comprises the following steps: plasticizing the plastic or other injectable material in a plasticizing apparatus (2); transporting the plasticized plastic or the plasticized other injectable material into a dosing apparatus (3), which has a fluidic connection (4) to the plasticizer apparatus (2), and specifically in essentially precisely the quantity that is to be introduced into the injection molding tool (1); transporting the plasticized plastic or the plasticized other injectable material, essentially in that quantity which is to be introduced into the injection molding tool (1), from the metering apparatus (3) into an injection apparatus (5), via a fluidic connection (6), while at the same time preventing the plastic or other injectable material from backflowing from the metering apparatus (3) into the plasticizing apparatus (2); injecting the entire quantity of plastic or the entire quantity of another i

Abstract: A process for the injection molding of objects having an outer layer of enamel and an inter layer of a plastic material is disclosed. According to the process, a liquid enamel is used. This enamel is injected by an enamel-injection apparatus through an enamel-injection die. A plastic melt passes through an injection unit into the cavity. According to the invention, the liquid enamel is injected into the flow path of the melt in the region before the cavity, before the melt is injected, so that the melt is encased by enamel before it is distributed in the cavity. Variations are also disclosed. For example, the form can be filled with enamel and the excess enamel drained. Then, the melted plastic material is introduced into the injection molding form. Also, the form can filled and then the capacity of the form increased to accommodate the melted plastic material. In any case, it is possible to use liquid enamels to enamel injection molded parts in the tool or form.

Abstract: A process for the injection molding of objects having an outer layer of enamel and an inter layer of a plastic material is disclosed. According to the process, a liquid enamel is used. This enamel is injected by an enamel-injection apparatus through an enamel-injection die. A plastic melt passes through an injection unit into the cavity. According to the invention, the liquid enamel is injected into the flow path of the melt in the region before the cavity, before the melt is injected, so that the melt is encased by enamel before it is distributed in the cavity. Variations are also disclosed. For example, the form can be filled with enamel and the excess enamel drained. Then, the melted plastic material is introduced into the injection molding form. Also, the form can filled and then the capacity of the form increased to accommodate the melted plastic material. In any case, it is possible to use liquid enamels to enamel injection molded parts in the tool or form.

Abstract: A closing unit 1 for mold tools 6 of injection molding machines is provided with a stationary mold support- or base-plate 2, a mold support plate 3 whose spacing can be adjusted relative to the stationary mold support plate by displacement thereof, as well as a drive support plate 4, which is connected to the stationary mold support- or base plate 2 by traction links 5, for instance struts. The traction links 5 can be used at the same time as slide guides for the mobile mold support plate 3 and an electromotor 8 serves as an actuation device for the mobile mold mounting plate 3, which electromotor 18 repositions one or several toggle levers 6 and 7 alternately between a kinked position and a stretched position. The toggle lever system or systems are installed between the drive support plate 4 and the mobile mold molding plate 3 and the mold tool 6 is maintained under closing stress or tension between the two mold support plates 2 and 3 in the stretched position of the toggle lever system or systems 7.

Abstract: An injection molding machine which includes an injection molding unit, a plurality of electrical servomotors for driving components of the injection molding unit, and a plurality of power and control units corresponding to the plurality of electrical servomotors for operating same, with each of the plurality of power and control units being provided with a cooling system including at least one cooling loop.

Abstract: An injection molding unit for injection molding machines includes a first subassembly having a plasticizing unit including a screw cylinder and a screw, a second subassembly having a metering drive to rotate the screw of the plasticizing unit, a third subassembly having two drives with substantially parallel axes for providing motion of the screw cylinder relative to an injection mold, and a fourth subassembly having two drives with substantially parallel axes for producing actual displacement of the screw in the screw cylinder of the plasticizing unit, with the plasticizing unit being located substantially centrally between the two parallel axes of the third and fourth subassembly drives, and with the two drives of said fourth sub-assembly include two liquid-cooled electric servomotors, respectively, electrically connected to one another to operate synchronously.

Abstract: A changing device for the screw cylinder of an injection molding machine. The screw of the screw cylinder is in releasable coupling connection with a drive unit of the machine. For releasing and uncoupling the coupling connection, the screw cylinder including screw can be displaced relative to the injection molding machine essentially transversely of the longitudinal direction of the screw cylinder. Two hydraulic cylinders are arranged spaced apart next to each other symmetrically and parallel to the longitudinal center plane of the injection molding machine. The two cylinders are connected to each other by means of a transverse member. A free space extending forwardly from the drive unit is defined by the two hydraulic cylinders and the transverse members. The free space forms an alignment seat which is open towards the front and towards the back and a longitudinal side. In the coupled position, the screw cylinder is fixable and lockable to the drive unit in this alignment seat.