Nitride screw processing

High quality material—Heat treatment(quenching and temperature)—Rough machining—Heat treatment(shaping)—Precision machining—Rough milling—Inspection—Heat treatment(Nitride hardening)—Precision milling—Inspection—Packing and delivery

Bimetallic screw processing

High quality material—Heat treatment(quenching and temperature)—Rough machining—Heat treatment(shaping)—Precision machining—Flight bimetallic alloy spray—Rough milling—Inspection—Heat treatment(Nitride hardening)—Precision Milling—Inspection—Packing and delivery

Nitride barrel processing

High quality material—Rough machining(inner diameter)—Heat treatment(quenching and temperature)—Precision machining—Rough milling—Inspection—Heat treatment(Nitride hardening)—Precision milling—Inspection—Packing and delivery

Bimetallic alloy barrel processing

High quality material—Rough machining(inner diameter)—Bimetallic alloy casting(inner diameter)—Precision machining—Precision milling—Inspection—Packing and delivery

Heat treatment

1.quenching and temperature

Quenching and temperature is a process of heat treatment to increase toughness and hardness of raw material. It can prolong screw and barrel service life and decrease deformation while using.

2.sharping treatment

Shaping treatment is a process of heating screw after rough machining, the temperature should higher than that in nitriding, to prevent deformation and bending while nitriding.

3.Nitride hardening

Nitriding hardening is a heating process that diffuses nitrogen into the surface of screw and barrel to increase hardness of surface.

Nitride hardness: HV ≥900

Nitride depth: 0.6-0.8mm

Hardness of spray, casting bimetallic layer: