Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1974-08-13
1976-07-06
Lanham, C.W.
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
72441, B21J 920
Patent
active
039674835
ABSTRACT:
A device is disclosed for positioning the slide of a press to compensate for insufficiencies of the stroke. A predetermined preload is first adjusted to the slide to take up clearances which may be present between the various moving parts of the press, dies and material to be processed. A slide preload compensating amount is then additionally adjusted to the slide equivalent to the amount of deformation of compression which the slide and frame will undergo during a working stroke. Therefore, the vertical position of the slide is established with the insufficiencies of the stroke eliminated. The device comprises in combination a worm mechanism having a worm shaft for adjusting the vertical position of said slide, an oil pressure motor for driving said worm mechanism, a torque limiter through which the driving force from said oil pressure motor is transmitted to said worm mechanism and a rotary pulse generator adapted to be rotated by said worm shaft of the worm mechanism and in which the rotation of the oil pressure motor is controlled by a servo valve adapted to be actuated at a value obtainable from the comparison between a pulse amount generated from said rotary pulse generator and a pulse corresponding to a predetermined frame deformation compensating amount and by an electromagnetic valve adapted to control the rotation direction of the oil pressure motor.
REFERENCES:
patent: 1774245 (1930-08-01), Strout
patent: 3280394 (1966-10-01), Clements
patent: 3348406 (1967-10-01), Holberson
patent: 3687069 (1972-08-01), Helrigel
Kimura Yoshinobu
Kuroyahagi Moritaka
Takegami Masao
Takeuchi Hirotoku
Aida Engineering Kabushiki Kaisha
Crosby Gene P.
Lanham C.W.
Zaidan Hojin Kikai Shinko Kyokai
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