The 6-inch alloy steel high-frequency hot forming elbow making machine is designed for the precision production of elbows from carbon steel, alloy steel, and longitudinal welded pipe. It combines hydraulic propulsion, medium frequency heating, and chain feeding to deliver stable, continuous operation for industrial pipe fitting manufacturing.

• Design and manufacture of the elbow hot forming machine.
• Installation of the equipment.
• Debugging and commissioning.

• Maximum push elbow diameter: 168 mm; minimum elbow diameter: 60.3 mm.
• Wall thickness range: 3–8 mm.
• Carbon steel seamless pipe material: 20G, A106B, A106C.
• Alloy steel seamless pipe material: 355P12, 15CrMo, 12Cr1MoV, P22, P91, WB36, etc.
• Longitudinal welded pipe material: Q235B, Q345B, X42, X52, X60, X65, X70, X80, etc.
• Environmental conditions: ambient temperature 5–38 °C, relative humidity ≤82%, input voltage three-phase four-wire 380V (−12% to +15%), frequency 50Hz ±2%.
• Continuous 24-hour daily operation; air must be non-corrosive and the equipment operated in a workshop with sufficient space.

• Oil cylinder manufacture complies with JB/T10205-2000 and JB/T15622-2005 standards.
• Cylinder made of 45# steel with inner surface finish Ra0.4; piston rod made of 45# seamless pipe, chrome-plated and polished to Ra0.3 with no straight or spiral lines.
• All other cylinder parts made of 45# forgings to ensure mechanical performance.
• Main oil cylinder piston guide sleeve adopts copper sleeve; all seals use standard priority series; main oil seal adopts imported Austrian AGCO.
• Before assembly, finish, hardness, matching size, forging quality, and seal quality are inspected; pressure test performed after assembly.

• The main engine consists of underframe, cylinder support plate, movable push plate, front baffle, and tug boat.
• The machine body is assembled by welding Q235A middle plate, channel steel, and round steel.
• The push plate and bottom frame adopt an upper pulley and guide rail structure for stable operation.
• The front baffle and cylinder are equipped with hydraulic mandrel adjusting cylinders on duty.

• Maximum working pressure of the hydraulic system: 25 MPa; experimental pressure: 31.5 MPa.
• Inner and outer surfaces of the fuel tank are anti-rust treated; a filter screen is installed to display liquid level and oil temperature.
• The entire hydraulic system is cleaned before oiling and trial operation.
• Three-stage pumping station design:
  • Stage 1: design flow 63 L/min (high-pressure main pump) with electromagnetic speed-regulating motor for pipe bending and push system.
  • Stage 2: design flow 63 L/min (gear pump) with common four-stage motor for fast forward and fast rewind; maximum forward speed 1200 mm/min, maximum fast rewind speed 1800 mm/min; working speed 0–280 mm/min infinitely variable and adjustable.
  • Stage 3: design flow 10 L/min (gear pump) for auxiliary hydraulic actions such as door lift and core bar adjustment.
• The pump station is connected by integrated block for stable, leak-free operation.

The thyristor, capacitor, water cooling cable, switch, and quenching transformer of the intermediate frequency power supply adopt domestic famous-brand high-quality products and meet the requirements of relevant standards. Input voltage: 380V.

Standard cold water system included.

• Hydraulic propulsion with stepless speed regulation.
• Medium frequency heating.
• Chain feeding.
• Hydraulic flapper, hydraulic tug, manual gate.
• Hydraulic propulsion with stepless speed regulation.

• The supplier guides installation and the demander actively cooperates.
• The supplier provides the equipment basic drawing; the demander constructs according to the drawing, and the supplier is responsible for guiding construction.
• The supplier provides the cooling water supply and discharge plan for the intermediate frequency power supply; construction is by the demander.
• The demander is responsible for setting the power cord at the position designated by the supplier.

• After the buyer has the debugging conditions, with strong cooperation from the buyer, the supplier completes equipment debugging.
• The buyer provides materials for debugging, 46# hydraulic oil, power supply, etc.
• The supplier is responsible for resolving failures caused by the equipment during debugging.

• Within 5 working days after debugging is completed and operation is normal, the buyer carries out acceptance inspection according to the technical agreement.
• After the equipment passes acceptance, both parties sign and confirm on the acceptance form.
• From the date of acceptance and signature, if a failure due to equipment occurs within one year, the supplier is responsible for repair and free accessories (except for operating errors).

The supplier is responsible for providing the following documents:

• Foundation diagram.
• Hydraulic schematic diagram.
• Circuit schematic diagram.
• Floor plan.