Page 43 - MetalForming April 2016
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Retrofitness
Table 3—Troubleshooting Tips for Mass-Finishing Systems
If, for whatever reason, a process falters, there are early-warning signs. Observation by the operator will help diagnose any underlying problems and bring the finishing process back on track. Here are some troubleshooting tips to help recognize and solve potential issues:
Observed problem
Possible cause(s)
Poor overall finishing results
(1) Media has lost its abrasive properties by being “glazed” over
(2) Compound flow too low
(3) Water flow too low
(4) Machine settings incorrect
(5) Ratio of media to parts is too low
(6) Wrong media type and/or size
Parts scratched/nicked
(1) Machine settings too aggressive
(2) Ratio of media to parts too low
(3) Inadequate material handling. For example,
workpiece drop heights are too high
Poor movement of media and parts in the machine
(1) Motor speed too low
(2) Incorrect setting of the imbalance weights
(vibratory equipment only)
(3) Too much oil on the raw parts
(4) Compound flow too high
Surface of finished workpieces too rough
(1) Media too aggressive (wrong media type) (2) Motor speed too high
Flat parts stick together during finishing
Anti-adhesion pellets must be added
Finished workpieces are not clean
(1) Water flow too low
(2) Compound flow too low (3) Wrong compound
Finished workpieces are stained
(1) Water flow too low
Too much foam in the machine
(1) Compound flow too high (2) Wrong compound
(3) Water too soft
Finished workpieces are corroding
(1) Wrong compound
(2) Compound flow too low
Finished workpieces become black
(1) Compound flow too low (2) Water flow too low
Media lodging in the workpieces
(1) Inadequate undersized-media removal (2) Wrong media shape or size
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