Workpiece shear control
AssigneeWestinghouse Electric Corp.
InventorAndrew W. Smith, Jr.
Life of this patent
Estimating the term…
Abstract
A rolling mill workpiece shear control apparatus and method are disclosed to provide adequate acceleration torque at the desired time of workpiece product cut. For particularly low product speed cut operations, a two step acceleration is provided that brings the shear to an initial low base speed of operation and at the desired time an acceleration to operating knife speed in accordance with the measured product speed. In relation to the desired product length, the time of the actual product cut is determined and updated for future similar cuts of product length and speed.
Claims24
In apparatus for providing a desired cut of a moving workpiece by a shear device driven by a motor, the combination of:
- means for determining the movement of speed of the workpiece;
- means responsive to said speed for determining an operational parameter of the shear device at the time of the workpiece cut;
- and
- means for controlling said shear device by one of first and second predetermined speed characteristics in accordance with said determined operational parameter.
In a method of providing a desired cut of a moving workpiece by a shear driven by a motor, the steps of:
- establishing the movement speed of the workpiece;
- establishing in response to said speed a selected operational parameter of said shear device at the time of the workpiece cut;
- and
- controlling said shear device in accordance with one of first and second speed characteristics determined by said operational parameter.
In apparatus for providing a desired cut of a moving workpiece by a shear device, the combination of:
- means for determining the movement speed of the workpiece in relation to said shear device;
- means responsive to said movement speed for determining a first speed characteristic in accordance with a first range of workpiece movement speeds and a second speed characteristic in accordance with a second range of workpiece movement speeds;
- and
- means for controlling said shear device in response to one of said first and second speed characteristics to effect said desired cut of the workpiece.
In a method of providing a desired cut of a moving workpiece by a shear device driven by a motor, the steps comprising:
- establishing the movement speed of the workpiece;
- predicting in response to said movement speed a predetermined operation of said shear device at the time of the workpiece cut;
- establishing a speed characteristic for said motor having one of at least a single acceleration step or a plurality of acceleration steps in accordance with said predicted operation of said shear device;
- and
- controlling said motor driving the shear device in accordance with said speed characteristics to effect said desired cut of the workpiece.
Dependencies are inferred from the claim text.