Process and apparatus for controlling the cutting feed of band s

Details Process and apparatus for controlling the cutting feed of band s Process and apparatus for controlling the cutting feed of band s

1981-03-26

1984-03-20

Meister, James M.

Cutting

Processes

83 621, 83 71, 83 72, 83 74, B23D 5300

Patent

active

044373678

ABSTRACT:
A method and apparatus for controlling the cutting feed of band saw machines for obtaining an optimum feed rate with the same safety against straying of the saw cut, according to which the saw band is maintained continuously within the area of its teeth under a residual tensile stress (.sigma..sub.Z.sbsb.Res) adjusted at least approximately to a constant value. For this purpose, a desired value is selected for the residual tensile stress, determined experimentally under practical conditions, which is correspondingly converted in case of load conditions of the saw blade deviating from the experiment, and this desired value is compared with the actual value. The actual value (.sigma..sub.Z.sbsb.Res) is derived as a difference from the tensile stress (Z) in the critical saw band point and the bending stress .sigma..sub.B caused by the feed, to be .sigma..sub.Z.sbsb.Res =.sigma.Z-.sigma.B>0. The actual value is adjusted to the desired value by varying the feed rate; the sum total of all feed forces or the sagging angle of the saw band is selected as a measure for the actual value. As a result thereof the danger of straying is precluded and yet an economically optimal feed rate is attained in band saws.

REFERENCES:
patent: Re25901 (1965-11-01), Whitmore
patent: 3680417 (1972-08-01), Wells
patent: 4016787 (1977-04-01), Sugimoto
patent: 4306478 (1981-12-01), Stolzer

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