HUFFORD A-10 STRETCH FORMER

Hufford MODEL A-10 Technical Description

TENSION CYLINDERS ..

Bore ...................................... _............................................ 5.125 inches

Rod...................................................................................... 2 inches

Stroke ................................................................................. I8.5 inches

Maximum pull at 2,000 psi.......................... 35,000 pounds

Tension cylinders are free to swivel about a

vertical axis in the tension cylinder brackets, allowing

the jaw to pull 20° in back of and 20° in front of the

arm center line. ·

The tension cylinder bracket is adjustable along

the arm in 5-inch increments by means of hand-crank

driven gear and rack. This adjustment provides a

range of distances between jaws varying from 6 inches

to 219 inches. (Up to 298 inches with AD-I attachments.)

Anti-rotation links are provided to prevent jaws

from rotating during forming cycle; however, they

may be disconnected when rotation is desired.

Model A-10 machines will accommodate AD-5,.

AD-8 and AD-9 jaws for extrusions and 10 inch sheet

jaws.

ARM ACTUATING CYLINDER

Bore ..................................................................................... 5.125 inches,

Rod................................ ............................. ........ ............. 2 inches

Stroke ................................................................................ 52 inches

Maximum pull at 1,000 psi......................... 17,400 pounds

Maximum thrust at 1,000 psi ...................... 20,600 pounds

The rod end of the arm actuating cylinder is

connected to a cross head which travels on ways along

the center line of the machine. The arms of the

machine are connected to this cross head by links.

Each arm swings simultaneously about its pivot, up to

a maximum arc of 90°. Position of each pivot pin is

adjustable from 12 inches to 25 inches from the center

line Of the machine.

POWER UNIT

Hydraulic oil tank and pumping unit, located at

rear of the press, consists of a 15-horsepower, 1,200

R.P.M. motor driving two Vickers vane-type pumps.

One pump provides power for the arm actuating

cylinder circuit and the other pump powers the tension

cylinders.

CONTROLS (Located at front of machine)

Two selector valves control directions of tension

cylinders.

A two-stage pressure control valve provides an independent

setting for wrapping pressure; another

for the final stretching pressure, and provides a

'means of unloading the pump when the press is

not forming parts.

One selector valve controls direction of arm movement.

A flow control valve governs rate of speed of arm

movement. Maximum speed is 90° in 12 seconds.

Adjustable automatic stop limits travel o£ arms.

. GENERAL INFORMATION STANDARD WITH AD-1 ATTACHMENTS

Over-all width

of machine ............................ 23'- 6" 31' - 6'

Over-all depth ....................... 12 - 9" 14' -11"

Over-all height ....................... 4' - 7" 4' -7"

Total weight.. .................... : .. l3,000 pounds 16,000 pounds

Table width ............................ 65" 65"

Table depth ....... : ............ .... .30" 30"

Table height. ................. ...... 35~1/2" 35 1/2"

Vertical distance

between center line

of tension cylinders

and top of table..................... 5 3/8 " 5 3/8

Maximum width of

sheet that can be

formed .. -............................... 10" 10"

Minimum die length

for 180° bend at

any tonnage ................ .......... 20" 20"

Maximum die length

for 180° bend at

full tonnage .........................;... 68" 68"

(Proportionately .longer dies may be used at lower tonnages.)