44
8. Malfunction and Countermeasures
8-1. In the case of malfunction
Check the points specified in the table below and take the appropriate countermeasure.
Table 8
Defective
Cause
Countermeasure
The chuck
does not
operate.
The chuck inside will break.
Disassemble and replace the broken part.
The sliding surface is seized.
Disassemble, correct the seized part with oilstone, etc., or replace the part.
The cylinder is not operating.
Check the piping and the electric system, and if there is no abnormality,
disassemble and clean the cylinder.
Insufficient
stroke of the
jaw.
A large amount of cutting powder is inside. Disassemble and clean.
The draw pipe loosened.
Remove the draw pipe and retighten it again.
The Work
slips.
The stroke of the jaw is insufficient.
Adjust so that the jaw is near the center of the stroke when gripping the
work.
The gripping force is insufficient.
Check that the correct hydraulic pressure is obtained.
The forming diameter of the top jaw is not
consistent with the work diameter.
Form again based on the correct forming method.
The cutting force is too large.
Calculate the cutting force and check that it is suitable for the specification
of the chuck.
Insufficient grease lubrication
Supply grease from the grease nipple, and open and close the jaw several
times without gripping a work.
The rotation speed is too high. Swinging
occurs due to incorrect alignment of cores
of work feeder, steady rest, tail stock, etc.
Lower the rotation speed to a speed at which the required gripping force
can be obtained. Align the cores sufficiently to eliminate such swinging.
Precision
failure.
The outer periphery of the chuck is
running out.
Check the end surface run-out and the outer periphery, and retighten the
chuck attaching
bolts.
Dust is attached on the serration part of
the master jaw and the top jaw.
Remove the top jaw, and clean the attacing part thoroughly.
The attaching bolt of the top jaw is not
tightened sufficiently.
Tighten the top jaw attaching bolt at the specified torque.
(Refer to page 25)
The forming method of the soft jaw is
inappropriate.
Is the plug for forming parallel to the chuck end surface? Is the plug for
forming not deformed due to the gripping force?
The height of the top jaw is too high, the
top jaw is deformed, the top jaw
attaching
bolt is elongated.
Lower the height of the top jaw. (Replace it with the standard size) or check
the gripping contact surface and make it uniform.
The gripping force is too large
leading to
the work being
deformed.
Lower the gripping force in the range possible to process to prevent
deformation.
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