a. Advanced Nitriding Technology .
b. Anti-corrosion and Wear-resisting Duplex Metal Spraying Technoloy .
c. we uses special alloy powders being sprayed and welded on the screw's ridge,and uses different alloy and welding methods for the screw of different functions .
Blanking→Rough Machining→Quenching & Tempering →Semi Finishing Machining→Finished Product→Detecting→Nitring/Alloy Processed →Finish Machining
Maximum screw length
Barrel inner bore diameter
A. 38crmoala in high quality
B. alloy steel in high quality
A. nitriding treatment
B. alloy coating spraying
C. heating treatment
D. screw fully hardening
E. vacuum quenching
F: electroplate hard chrome
A: depth of nitrition layer: 0.6-0.8mm
B: nitriding treatment for 7 day and night, surface hardness HV>900
C: fragility of nitriding: less than grade 1
D: surface roughness: ra0.4um
E: streightness of screw: 0.015mm
F: depth of bimetallic layer>2mm
G: hardness of alloy platig: HRC 62-72
H: surface of hardness of chrome coating layer: HRC 62-72
I: thickness of chrome coating layer: 0.03-0.06mm
Zhejiang pinbo plastic machinery co.,ltd is a factory specialized in making screw barrel,
gearbox, t die, filter and recycling machine.The former name is ruian yumin machine
screw co.,ltd since1988 with brand name PYM. Our company covers land more than 10000 square meters, with two workshop. We owns advanced CNC machines and technique, and nitriding ovens in depth 8000mm. We study, design and manufacture every product according to the exact need of every client. That is why our goods are hot sell among many coutries and zones.