Mich. Admin. Code R. 408.14251 - Forging presses
Rule 4251.
(1)
Forging press operating valves shall be located so that the operator will have
a clear and unobstructed view of the press when standing in the usual operation
position. If this arrangement is impossible, a mirror shall be installed in
front of the operator to assist him in obtaining a full view of the
press.
(2) When dies are being
changed or maintenance is being performed on a press, the following shall be
accomplished:
(a) The energy source to a
mechanical press shall be locked out, and the flywheel shall be at rest before
work begins.
(b) The hydraulic
pumps and power apparatus of the hydraulic press shall be locked out.
(c) Blocking shall be provided and used to
prevent the ram from dropping. The material shall equal or exceed
specifications in table 1.
Die design shall take into consideration the need for a flat spot for the block.
(3) Location of steam, air, or water headers
and scale or splash aprons shall give the operator sufficient clearance at the
front of the forging press for any upward or downward movement of the tongs
without creation of a pinch point between these facilities and the
tongs.
(4) A hot forging press
shall be equipped with a scale guard, as prescribed in
R
408.14241(3).
(5) A forging press shall be provided with a
positive means for retaining a piston and head assembly inside the
counterbalance cylinder in case of failure or breakage of the piston and rod
assembly.
(6) An electrical motor
shall be provided with a disconnect switch, as prescribed in
R 408.14247(1). A
hydraulic forging press shall be equipped with a positive type lockout
disconnecting switch or valve.
(7)
Fire resistant fluids shall be used in a hydraulic press forming hot
work.
(8) Die bolts shall not be
worn or damaged, and shall be long enough to permit being threaded into die
bolt holes a distance not less than 1 1/2 times the diameter of the bolt.
Washers shall not be used in multiple to compensate for excessive lengths of
bolts.
(9) A mechanical foot pedal
or foot switch shall be covered on both sides and top with a substantial guard
to prevent accidental tripping. The guard shall have rolled, broad, or covered
edges to prevent injury or discomfort. The mechanical foot pedal shall be
mounted to a press leg or anchored to the floor.
Notes
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