Method of cutting carbon and alloy steel

Details Method of cutting carbon and alloy steel Method of cutting carbon and alloy steel

2007-02-20

2007-02-20

Peterson, Kenneth E. (Department: 3724)

Cutting

With randomly actuated stopping means

Responsive to tool detector or work-feed-means detector

C083S074000, C083S490000

Reexamination Certificate

active

10703264

ABSTRACT:
The present invention discloses a method and apparatus for controlling the load on the blade of a steel-cutting saw A programmable logic controller senses the spindle motor load current and compares it with the desired optimum operating current. Variations in hardness of the steel member cause the spindle motor current to fluctuate. The advancement of the blade by an electric servomotor is controlled by the PLC. The PLC reduces the rate of advancement of the blade in response to increasing spindle current, thereby reducing the load on the blade. The blade speed is maintained constant by a variable frequency motor powering the spindle motor. The operator selects the blade speed from 3 to 85 RPM, which is maintained by the variable frequency drive. The feed rate is the variable that is controlled by the PLC, by which the load current of the spindle motor is maintained relatively constant.

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