Q: Whatis QPQ?A: "QPQ" is the abbreviation of the English "quench-polish-quench", that is, "Quench one Polish one Quench". It refers to the black metal parts into two different properties of the salt bath, through a variety of elements into the metal surface to form a composite infiltration layer, so as to achieve the purpose of modifying the surface of the parts. It has not been quenched, but has achieved the effect of surface quenching, so it is called QPQ at home and abroad.

Q: What are the basic requirements for piston rods?A: (1) To have sufficient strength, stiffness and stability;
(2) Good wear resistance and high processing accuracy and surface roughness requirements;
(3) Minimize the influence of stress concentration on the structure;
(4) Ensure reliable connection and prevent loosening;
(5) The design of the piston rod structure should be easy to disassemble the piston.