Boots – shoes – and leggings
Patent
1990-12-06
1992-12-08
Smith, Jerry
Boots, shoes, and leggings
364508, 36455102, 73104, 340680, 340683, G06F 1546, G08B 2100
Patent
active
051703580
ABSTRACT:
A method of controlling chatter in a rotating, chip cutting machine tool cutting at a predetermined depth on a workpiece in which the speed of rotation of the cutting tool relative to the workpiece and the rate of speed of the cutting tool relative to the workpiece both adjustably controlled between predetermined minimum and maximum rates for the particular combination of machine tool and workpiece material. The method includes the steps of detecting vibration signals representative of relative vibrations between the machine tool and the workpiece and generated by preliminary operation of the machine tool at predetermined conditions, processing that generated signal as a function of signal frequency, obtaining a signal indicative of the rotational speed and determinating the threshold of the signal level above which are excluded harmonics of the predetermined rotational frequencies that are indicative of chatter in the cutting tool. Additional steps interrupt the feed of the cutting tool and change the speed of rotation if operationally generated audio signal levels exceed a threshold and then change the speed of rotation of the cutting tool and resume the feed of cutting engagement. These steps are repeated until operation of the machine tool is obtained without operationally generated chatter signals exceeding the threshold or, when necessary, reducing the speed of rotation and the rate of feed to predetermined levels known to avoid generation of chatter signals in excess of the threshold.
REFERENCES:
patent: 4080853 (1978-03-01), Goto
patent: 4456960 (1984-06-01), Wakai
patent: 4558311 (1985-12-01), Forsgren et al.
patent: 4559600 (1985-12-01), Rao
patent: 4604834 (1986-08-01), Thompson
patent: 4617503 (1986-10-01), Davis et al.
patent: 4636780 (1987-01-01), Thomas et al.
patent: 4698773 (1987-10-01), Jeppsson
patent: 4723219 (1988-02-01), Beyer et al.
patent: 4806914 (1989-02-01), Thomas et al.
patent: 4833617 (1989-05-01), Wang
patent: 4849741 (1989-07-01), Thomas
patent: 4853680 (1989-08-01), Thomas
"Adaptive Control for Face-Milling Operations with Strategies for Avoiding Chatter-Vibrations and for Automatic Cut Distribution", by Weck, Verhaag & Gather.
"A Sound Monitoring System for Fault Detection of Machine and Machining States", by Takata, Ahn, Miki, Miyao & Sata from the Annals of the CIRP, vol. 35/1/86.
"Sensor-Based Control for Chatter-Free Milling by Spindle Speed Selection", by Smith & Delio.
Brown Thomas E.
Manufacturing Laboratories, Inc.
Smith Jerry
LandOfFree
Method of controlling chatter in a machine tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of controlling chatter in a machine tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling chatter in a machine tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-965119