US 11,440,068 B2 · Press machine

Abstract

A pressing machine is described for plastically deforming a tubular workpiece, in particular a fitting. The pressing machine has a motor, and pressing jaws which are driven by the motor and can apply a force to the workpiece during operation. The pressing machine also has a power transmission unit coupled to the motor and the pressing jaws for transmitting power from the motor to the pressing jaws. The pressing machine also has at least one sensor unit for measuring at least one pressing parameter P and a controller which receives the currently measured value of the pressing parameter P from the sensor unit and determines therewith the pitch or slope of a press parameter curve K of the press parameter P. The controller terminates a pressing operation before reaching a maximum possible pressing force Pmax when the pitch or slope of the press parameter curve K of the press parameter P satisfies a shutdown criterion. Also described is a corresponding method for operating a pressing machine.

Claims12

Dependent claims

A pressing machine for plastically deforming a workpiece, wherein the pressing machine comprises:

a motor;
pressing jaws which are driven by the motor and can apply a force to the workpiece during operation;
a power transmission unit coupled to the motor and the pressing jaws for transmitting power from the motor to the pressing jaws;
at least one sensor unit for measuring at least one pressing parameter (P);
and
a controller which receives a currently measured value of the pressing parameter from the sensor unit and checks if a predetermined minimum value (Pmin) is exceeded for the pressing parameter (P) and checks if the duration of the pressing operation exceeds a minimum time (Tmin);
and if one of the pressing parameter (P) exceeds the predetermined minimum value (Pmin) and the duration of the pressing operation exceeds the minimum time (Tmin), subsequently the controller determines a slope of a pressing parameter curve (K) of the pressing parameter (P);
in which
the controller terminates a pressing operation before reaching a maximum possible pressing force (Pmax) when the slope of the pressing parameter curve (K) of the pressing parameter (P) fulfills a switch-off criterion.

6 more elements

Dependencies are inferred from the claim text.

Press machine

Life of this patent

Press machine

Life of this patent

Abstract

Claims12