Hydraulic Cylinder Manufacturing Process
About CMG
  • 0.6+ million tons
    YEARLY CAPCACITY
  • 900+
    PATENTS
  • 5000+
    PRODUCT SERIES
  • 100+
    SALES NETWORK
Tube (Barrel)
a. Preparation (seamless steel tube) - inspection (material, etc.) - quenched and tempered (outsourcing: parts) - machining (outside, shelves, boring seam allowance, flange seam allowance, etc.) - tempering hardness testing-welding (welding pipe joint, flange and other accessories)-boring or honing (rough boring, boring, rolling) - machining(hole slot or the internal and external screw thread) -fitter (drilling) - inspection - anti-rust treatment, storage

b. Preparation (forging) - inspection (material, inspection, etc.), welding (blank butt welding) - welding flaw detection, rough machining- tempering (outsourcing: parts), machining(outside, shelves, boring seam allowance, flange seam allowance, etc.) - tempering hardness testing -welding (welding pipe joint, flange and other accessories)- boring or honing (rough boring, boring, rolling) - machining(hole slot or the internal and external screw thread) and fitter (drilling) - inspection - anti-rust treatment, storage

Piston Rod
Preparation- inspection (material certificate, etc.) - rough machining)- quenched and tempered (outsourcing: parts) - hardness testing - machining (rough, precising machining) - grinding (fine grinding outer circle) - hard chrome (outsourcing: hard chrome plating) or surface heat treatment (outsourcing: part) - polishing - inspection - rust prevention and storage

Piston guide sleeve
Material - inspection (material certificate, forgings inspection, etc.) - rough machining- precise machining - inspection - rust prevention and storage

Cylinder head, rod end
Preparation - inspection (material certificate, etc.) - rough machining - quenched and tempered (outsourcing: parts) - hardness testing - machining (rough, precising machining ball head, internal and external thread) - saw - milling - boring (boring hole) - fitter (drilling hole or oil mouth) - inspection - rust prevention and storage

Tube body
Welding (welding cylinder head and tube)-destress-welding flaw detection-rust prevention and storage

Assembly
Familiar assembly drawing (including the factory test program and other technical documents)－ prepare all the assemble the parts and components (including seals, tooling) - clean up - parts clean - parts of fittings and parts fine cleaning - seal assembly and parts assembly - sign to check test device to the factory test-painting-packing - delivery

Welding and Finishing
1. Finishing: sandblasting, painting
2. Treatment of the piston rod: nickel plating or ceramic plating, supersonic flame spraying, laser cladding, thermal spraying

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