QPQ surface treatment

QPQ processing, which is the abbreviated form of Quench-Polish-Quench. It refers to putting ferrous metal parts into two salt baths with different properties, infiltrating the metal surface through multiple elements 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 it has achieved the effect of surface quenching, so it is called QPQ at home and abroad. The latest improved process is called light nitriding. Compared with QPQ, this process has the advantages of no deformation, higher hardness, deeper depth, high efficiency, no need for polishing, high nitriding accuracy, non-standard and large parts.

The following table shows the application examples of QPQ process on some typical parts:

No. Category Application

1 High-speed steel cutter All kinds of HSS drills, milling cutters, broaches, gear cutters can improve the service life l-4 times, especially for difficult-to-machine materials, the effect is particularly prominent

2 Tool bar and tool body Various tool holder tool bars and tool bodies improve their wear resistance, anti-scratch and non-deformation, which satisfies the positioning and precision requirements well, and has strong anti-rust ability

3 Mould Applicable to various die-casting molds, injection molds, extrusion molds, rubber molds, glass molds, etc., greatly improving the service life of the mold and improving the surface finish of the processed parts

4 Auto parts Valves, crankshafts, camshafts, gears, gas spring piston rods, shock absorber rods, differential brackets, spherical pins and other dozens of parts have been used for many years, and the effect is remarkable.

5 Sports equipment, golf balls, etc., products are directly exported to European and American markets

6 Textile machinery 7 Switch parts 8 Printing machinery 9 Sealing machinery Various valves and shaft parts

10 Power tool parts 11 Construction machinery parts 12 Camera parts Shutters, locks and other stamping parts