Patent ID: 11919209
Assignee: NIENSTEDT GMBH
Field: Other special machines (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 7:
8. An apparatus for machining or processing a workpiece that can be positioned in a workpiece holder, comprising:
at least one tool that is movable relative to the workpiece holder during the machining or processing of the workpiece, wherein the apparatus is a press device for the form-pressing of workpieces, and includes a component movable by the press device in a reciprocal stroke movement during the machining of the workpiece; and
at least one pressure line circuit having at least one pump unit and at least one energy storage, which is in flow connection with the pump unit via a pressure line, and a pressure outlet, at which a pressure difference present in the energy storage with respect to the ambient pressure can be tapped via a pressure supply line;
wherein the pump unit is a compressor for building up a pneumatic overpressure arranged to suck in a gaseous medium and press it into the pressure line in a compressed state, wherein the energy storage is a pneumatic pressure storage with a pressure vessel with an internal pressure which is higher than the ambient pressure;
wherein the pump unit has at least one mechanically driven pump element movable back and forth for sucking in or sucking out a medium and being in flow connection with the pressure line; and
wherein the pump element is directly or indirectly mechanically coupled to the apparatus in such a way that during the machining or processing of the workpiece the pump element is driven by movement of the tool;
wherein the pump unit is a compressor in the form of a piston/cylinder unit for building up a pneumatic overpressure arranged to suck in a gaseous medium and press it into the pressure line in a compressed state and energy storage is a pneumatic pressure storage with a pressure vessel with an internal pressure which is higher than the ambient pressure; and
wherein a piston of the piston/cylinder unit is coupled to the stroke movement of the movable component of the press device, and the piston/cylinder unit has a working chamber arranged on one side of the piston;
wherein the working chamber is in flow connection with the pressure line having a pressure valve;
wherein the pressure valve permits a flow from the piston/cylinder unit to the pneumatic energy storage, and is capable of blocking automatically in the opposite direction;
wherein the apparatus comprises a pressure supply line having a controllable control valve and which runs directly to one or more pneumatically loaded consumers which are in flow connection with the energy storage via the pressure supply line or wherein the pressure supply line runs from the pneumatic energy storage to a transfer point at which compressed air is tapped via a suitable interface,
wherein the press device has at least one abutment surface and at least one press plunger which can be set in a lifting movement against the abutment surface,
wherein the movable component is a lifting rod of the press plunger and the lifting rod includes a hollow cylindrical area that forms the cylinder of the piston/cylinder unit such that the pump unit is integrated into the lifting rod, and
wherein the pump element is guided upwards through the hollow cylindrical area of the lifting rod and is connected with an area of the machine tool that does not move with the lifting rod.