Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form
Patent
1979-09-04
1982-10-26
Combs, Ervin M.
Metal deforming
By deflecting successively-presented portions of work during...
By use of work-contacting wiper and moving, work-holding form
B21D 704, B21D 905
Patent
active
043555250
ABSTRACT:
There is disclosed a tube bending machine with a rotatable die having a tubing clamp associated therewith and a stationary wiper block to bend a tubing work piece around the die as it rotates. The wiper block and tubing clamp are placed into and locked in operative position with similar toggle linkages which are adjustable to accommodate different bending dies and wiper blocks. The die is rotated by a fluid pressure linear actuator chain driving a sprocket secured to a common shaft with the die; the chain is pinned at one end to the sprocket and the sprocket has a torsion spring connected thereto applying tension to the chain and causing the die to return when the actuator moves to slacken the chain. An adjustable stop limits the travel of the actuator shaft and a pointer which moves with the stop reads against a scale to directly indicate degree of bend. The actuator is operated on the bend stroke by a pilot valve operated by the wiper block toggle mechanism; the pilot valve operates the main valve controlling the linear actuator. Another pilot valve is hand lever operated and causes extension of the linear actuator by the main valve so that the spring returns the rotatable die; before this takes place this pilot valve pressurizes a work piece ejection actuator positioned to strike the work piece to dislodge it if it is stuck in the die. A mandrel carriage slides on a rail under control of a toggle mechanism to insert or retract a mandrel; the carriage is adjustable both laterally and longitudinally of the mandrel axis and the mandrel is vertically adjustable on the carriage. There is an arrangement for rapid replacement of bend dies including a boss and a stud on the die table mating with depressions in the die and a draw bolt mating with a tapped hole in the bottom of a die and rotatable by a hand wheel connected to the end of the bolt shaft which extends vertically through the sprocket drive shaft and drive table.
REFERENCES:
patent: 2312122 (1943-02-01), Parker et al.
patent: 3017917 (1962-01-01), Streit
patent: 3205690 (1965-09-01), Roessler
patent: 3261193 (1966-07-01), Van Harten
patent: 3276235 (1966-10-01), Stanley
patent: 3531963 (1970-10-01), Garner et al.
patent: 3545247 (1970-12-01), Fazzani
patent: 4038853 (1977-08-01), Schwarze
patent: 4236398 (1980-12-01), Schwarze
Combs Ervin M.
Keegan Robert R.
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