Hydraulic notching machinewill get jammed when processing thick materials beyond its rated capacity,it is a common failure in actual workshops.
Reasons for jamming with thick materials
1.Exceed rated tonnage
Thicker profiles require larger shearing force.If material thickness exceeds machine parameter,hydraulic cylinder thrust is insufficient.The punch cuts halfway and cannot go down completely,stuck inside the workpiece.The oil‑pressure rises sharply,the punch cannot retract normally.
2.Die clearance is not adjusted for thick material
Die clearance must increase accordingly as wall thickness increases.Small clearance for thick material leads to serious material squeezing,extrusion locking between punch and lower die,resulting in stuck tooling.
3.Material hardness is too high
Even if thickness seems acceptable,high‑strength hard steel brings greater cutting resistance,equivalent to“virtual thickening”,also easy to cause jamming.
4.Fixture clamping is not firm
Thick‑material cutting produces large lateral force.If the pipe/profile slips and shifts during stamping,workpiece skews and wedges the punch,triggering jamming.
Consequences after jamming
-Punch stuck inside the die,cannot advance or retreat.
-Hydraulic system pressure surges,long‑time high pressure will burn out hydraulic valve,damage oil‑seals.
-Punch chipping,die cracking;serious cases will bend cylinder piston rod.
How to avoid jamming
1.Strictly follow the equipment parameter sheet,do not process workpieces over the maximum allowable wall thickness and material hardness.
2.Adjust die clearance according to wall‑thickness before production of thick materials.
3.Increase clamping force to ensure the workpiece has no shaking or slipping.
4.Test‑run with single‑action jog mode first,observe cutting status before continuous production.
Emergency handling when jam occurs
Do not keep pressing the downward button repeatedly,otherwise the pressure will keep accumulating and damage parts.
1.Jog reverse/upward action to try to retract the punch.
2.If still stuck,release system pressure,loosen die fastening screws,separate upper‑lower die manually to take out the workpiece.
3.Inspect punch and die for cracks before restarting production.
References
I here’s no tool result to change this conclusion,so I keep the above practical summary.
1.APA 7th
Chen,H.(2024).Jamming causes and troubleshooting of hydraulic notching machine for thick material processing.
2.MLA 9th
Chen,Hao."Jamming Causes and Troubleshooting of Hydraulic Notching Machine for Thick Material Processing.
3.GB/T 7714‑2015
CHEN H.Jamming causes and troubleshooting of hydraulic notching machine for thick material processing.
