Pressure welding device and pressure welding method using an advance drive designed as an electrohydraulic direct drive
First Claim
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1. A pressure welding device comprising:
- a plasticizing unit;
a positioning and compressing unit;
a controller; and
a feed unit for a workpiece and for a process axis, the feed unit comprising a controllable or regulatable hydraulic feed drive configured as a controllable or regulatable electrohydraulic direct drive for the process axis, wherein;
the feed drive comprises an electric drive motor, at least one hydraulic cylinder with piston defining a forward chamber and a rear chamber and a pump arrangement comprising at least one pump, the pump arrangement being connected to the electric drive motor and being driven by the electric drive motor;
the feed drive is controlled or regulated via the electric drive motor; and
the feed drive has a closed hydraulic circuit, which connects both the forward chamber and the rear chamber of the cylinder to the pump arrangement.
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Abstract
A pressure welding device (1) and a pressure welding method are provided. The pressure welding device (1) includes a plastification unit (5), a positioning and compressing unit (6), a controller (26), and an advance unit (7) for a workpiece (3) and for the process axis (13). The advance unit (7) has an open- or closed-loop controllable hydraulic advance drive (12) that is formed as an open- or closed-loop controllable electro-hydraulic direct drive for the process axis (13).
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Citations
20 Claims
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1. A pressure welding device comprising:
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a plasticizing unit; a positioning and compressing unit; a controller; and a feed unit for a workpiece and for a process axis, the feed unit comprising a controllable or regulatable hydraulic feed drive configured as a controllable or regulatable electrohydraulic direct drive for the process axis, wherein; the feed drive comprises an electric drive motor, at least one hydraulic cylinder with piston defining a forward chamber and a rear chamber and a pump arrangement comprising at least one pump, the pump arrangement being connected to the electric drive motor and being driven by the electric drive motor; the feed drive is controlled or regulated via the electric drive motor; and the feed drive has a closed hydraulic circuit, which connects both the forward chamber and the rear chamber of the cylinder to the pump arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 18, 19, 20)
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9. A method for pressure welding of workpieces by means of a controlled pressure welding device, the method comprising the steps of:
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plasticizing the workpieces by means of a plasticizing unit; and positioning the workpieces relative to one another and compressing the workpieces along a process axis by means of a positioning and compressing unit; moving a workpiece along the process axis by means of a feed unit with a controlled or regulated hydraulic feed drive, wherein a feed is effected with the feed drive, which comprises a controlled or regulated electrohydraulic direct drive for the process axis, wherein; the feed drive comprises an electric drive motor, at least one hydraulic cylinder with piston defining a forward chamber and a rear chamber and a pump arrangement comprising at least one pump, the pump arrangement being connected to the electric drive motor and being driven by the electric drive motor; the feed drive is controlled or regulated via the electric drive motor; and the feed drive has a closed hydraulic circuit, which connects both the forward chamber and the rear chamber of the cylinder to the pump arrangement. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification