How to assemble the parts for injection molding machine gear pump?
The parts used for gear pumps that have been repaired or re-manufactured shall be cleaned first by grinding the burrs and sharp edges of each part with oil and stone.
In measuring the thickness of pump body and gear, it should ensure that the pump body is larger than the gear thickness within the range of 0.02 ~ 0.03mm, and the surface roughness Ra of the two parts should not be greater than 1.25 mm thick.
The fit size of the inner hole and shaft of the torque should conform to the H7/h6(or H7/k6) fit precision.The fit size of key and keyway should accord with H9/ H9 mating precision.Then apply a thin layer of lubricating oil to the mating part of the shaft and install the gear on the shaft.
To assemble the pump body and front and rear end cover, tap into the positioning pin and tighten each screw evenly.
With manual rotation of gear pump shaft, rotation should be flexible, without clamping.