A-A-55012 Press, "H" Frame Type, Hydraulic, Electric Motor Driven \(S/S By A-A-59384\)

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A-A-55012

The frame shall be fabricated of structural steel sections

3.2 Frame.

consisting of a headrail, worktable, siderails, lower spacer bars and legs.

All components shall be fastened together by bolts or by welding, or a

combination of bolting and welding. Regardless of the method used, the press

shall have the strength to withstand not less than 1-1/2 times the maximum

rated tonnage capacity of the press. The headrail shall support the hydraulic

cylinder and ram assembly. The headrail and all other crossmembers shall

provide the strength to maintain parallelism of the side members. The frame

shall be supported by legs of the length and strength to provide stability to

the press when loaded to maximum pressing capacity. The ram axis shall be

perpendicular to the worktable within an accuracy of 0.120 inch per foot.

3.3 Siderails, worktable, and support pins. The siderails shall have a

series of equally spaced holes. The worktable shall have matching holes to the

siderails.

Not less than two steel pins shall be provided for supporting the

worktable to the siderails. The pins shall be shaped for easy insertion and

removal from the holes. The shear strength of the pins shall be not less than

1-1/2 times the tonnage rating of the press. The pin hole spacing in all

members shall have the accuracy to ensure that all pins support equal loads

when pressing force is centered between the headrail and the worktable. A

winch type lifting device for raising and lowering the worktable shall be

provided.

The hydraulic system shall conform to or exceed the

3.4 Hydraulic system.

requirements of National Fluid Power Association (NFPA/JIC) T2.24.1. The

hydraulic system shall be capable of exerting 100 percent of the rated

tonnage.

3.4.1 Cylinder and ram assembly. Unless otherwise specified (see 7.1), the

press shall be furnished with a fixed type cylinder and ram assembly. When

specified (see 7.1), a moveable type assembly which is adjustable horizontally

along the headrail shall be furnished. The moveable assembly shall have a

means of being clamped or locked at any position within its range of travel.

Provisions to prevent extension of the ram beyond its normal "end-of-stroke"

position shall be provided.

3.4.2 Hydraulic pump. The hydraulic pump shall be electric motor driven.

The pump shall be manufaturer's standard pump offered to the commercial

market.

3.5 Work support devices. The press shall be furnished with two flat work

support devices and two "V" type support devices. The devices shall be

moveable along the entire length of the worktable. The devices shall have a

means to prevent them from sliding off the worktable. A single pair of

invertible support devices suitable for supporting flat workplaces on one

side, and round workplaces on the other side, may be furnished in lieu of the

two pairs. Regardless of the type work support devices furnished, they shall

withstand repeated pressing forces.

3.6 Pressure gage. A pressure gauge calibrated to read in tons of ram

force shall be furnished.