Hydraulic shearing machine is widely used for cutting steel plates,square tubes and profile materials in guardrail factories and metal‑processing workshops.Long‑term heavy‑load operation,improper operation and insufficient routine maintenance will trigger various typical faults,mainly covering cutting‑quality defects,hydraulic system malfunctions,mechanical‑structure failures and electrical control abnormalities.Timely identification of these common faults helps reduce downtime and avoid batch defective workpieces.
Cutting‑quality defects are the most frequently‑encountered problems.Excessive burrs and rough fracture surfaces usually stem from dull cutting blades or mismatched blade clearance.Uneven clearance will cause inconsistent shearing zones on the cutting section.Incomplete cutting occurs when hydraulic pressure is insufficient or workpieces exceed machine allowable wall‑thickness.Workpiece offset and skewed cutting are mostly caused by loose pressing cylinders or worn clamping mechanisms,which cannot fix materials firmly during shearing.For galvanized materials,accumulated zinc chips will scratch workpiece surfaces and accelerate blade wear.
Hydraulic system faults seriously affect power output.Oil leakage from cylinder seals,pipe joints and valve assemblies is common,resulting in continuous pressure loss.Contaminated hydraulic oil will block filter elements and spool valves,leading to slow slider movement,failure of return stroke or unstable output force.Continuous heavy‑duty production easily causes hydraulic‑station overheating.High oil temperature accelerates seal aging and reduces system effective pressure.Air mixed into the oil circuit will bring spongy pressure output,making the cutting action weak and unstable.
Mechanical‑structure faults accumulate gradually under long‑time vibration.Loosened connecting bolts on frame and tool holder cause blade misalignment.Wear of guide rails without regular lubrication leads to jitter and positioning deviation of the sliding block.For CNC‑type hydraulic shearing machines,back‑gauge positioning drift is another typical fault,which produces inconsistent cutting‑length dimensions regardless of correct parameter setting.Severe overload may even cause local frame deformation,which belongs to irreversible mechanical damage.
Electrical and control faults cannot be ignored.Vibration in working environment easily loosens wiring terminals and damages limit switches.Phenomena such as sudden shutdown,failure to start cutting stroke or abnormal slider return may appear.If proximity sensors are covered by iron scraps,false triggering of safety protection will occur.For servo‑equipped models,encoder failure will directly result in positioning disorder.
Many faults can be prevented through standardized daily maintenance.Operators shall not process materials beyond machine rated tonnage.Regularly replace hydraulic oil,clean oil filters,inspect blade clearance and fastening status of mechanical parts.Before batch production,sample cutting test is recommended to check cutting quality.Once serious mechanical deformation appears,stop the machine immediately instead of blindly increasing hydraulic pressure.
In short,the main common faults of hydraulic shearing machine include poor cutting surface quality,hydraulic pressure shortage and oil leakage,mechanical positioning drift and electrical‑circuit failure.Scientific operation and periodic maintenance are effective measures to keep stable running condition.
References
APA 7th
Singh,R.,&Chauhan,S.(2018).Fault diagnosis and performance analysis of hydraulic shearing machine for metal sheet processing.*IOP Conference Series:Materials Science and Engineering*,402(1),012076.
MLA 9th
Singh,Rajat,and Sandeep Chauhan.“Fault Diagnosis and Performance Analysis of Hydraulic Shearing Machine for Metal Sheet Processing.”*IOP Conference Series:Materials Science and Engineering*,vol.402,no.1,2018,p.012076,
GB/T 7714‑2015
SINGH R,CHAUHAN S.Fault diagnosis and performance analysis of hydraulic shearing machine for metal sheet processing[C]//IOP Conference Series:Materials Science and Engineering.IOP Publishing,2018,402(1):012076.
