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|  MIL-P-45051D(AL)
3.5
Components
Body
3.5.1
3.5.2
Hydraulic seals
3.5.3
Hydraulic pump
3.5.4
Pressure gage(s)
3.5.5
3.5.6
Relief valve
Jig fixture and work support members
3.5.7
Hydraulic oil
3.6
Product identification
3.7, 3.7.1,
and 3.7.2
3.8
Workmanship
A certificate of conformance may be used to satisfy examination requirements
when more than a visual or dimensional verification would be required.
4.6 Tests.
4.6.1 Pressure gage accuracy test. The pressure gage(s) shall be tested in
accordance with paragraph 6.0 of ANSI B40.1, for grade B construction, as
applicable to gages over 100 pounds per square inch gage. Accuracy shall be in
accordance with 3.5.5. The calibration or test gage pressure shall be multiplied
by the cross sectional area of the ram to verify both pounds per square inch and
tonnage in pounds-force readings indicated on the gage dial(s) (see 3.5.5).
4.6.2 Relief valve test. With the relief valve installed in the press, the
ram shall be blocked and pressure applied with the pump to indicate between 12.5
to 14.5 tons on the gage. If the relief valve fails to open and cannot be
adjusted to open between 12.5 and 14.5 tons gage pressure, the press under test
shall be rejected (see 3.5.6).
*
4.6.3 Rated capacity test. The ram shall be blocked and a load applied by
operating the pump until the pressure gage indicates the rated load of 12,5 tons.
This test shall be performed at half stroke and near full stroke of the press
using a force not greater than 50 pounds two inches from the end of the handle.
Failure to develop the required indicated load capacity or evidence of leaks,
breaks, permanent distortions, or failure of handle actuation with a maximum 50
pound force shall be cause for rejection (see 3.4.1, 3.5.3, and 3.5.4).
*
4.6.4 Proof load test. The relief valve shall be removed and the opening
plugged for this test. Replace the pressure-tonnage gage(s) of 3.5.5 with a
pressure gage(s) equivalent to at least 30 tons pressure. The ram shall be
blocked at nearly full travel and sufficient pressure applied with the pump to
indicate the maximum gage load of 16 tons. The press shall be allowed to stand
under this load for a period of five minutes. Any evidence of pressure loss,
leaks, breaks, creepage, or permanent distortion shall be cause for rejection
(see 3.4.2, 3.5.1, and 3,5.7).
4.6.5 Bend and twist test. With the anvil and work support members in
place, and using not less than four various size connecting rods between 3.75 to
15.5 inches long, the press shall be tested as follows:
(a) Deform the connecting rods in the following manner and use a
connecting rod alignment indicator to determine the degree of
deformation.
8
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