| CY14-1B type axial piston pump swashplate friction material as part of nodularcast iron QT600-3, wear resistance, impact resistance, fatigue resistance, stablemechanical properties, content of pearlite in70%above, parts after quenchinghardness above49HRC. According to the original process of friction parts qualityproblems and their causes are analyzed, the production process of QT600-3new alloycast production, and testing, production, study its microstructure and properties.The first after casting, the casting normalizing+stress relief annealing toobtain QT600-3casting, rough machining after quenching and tempering on casting,finishing the production of the swash plate and other parts of the way. Application ofstatistical methods of analysis, found quality problems of friction and its reason,because in the casting normalizing, heating and cooling process at differentpositions of the casting, heating and cooling temperature gradient, the undercooling isnot consistent, unstable casting matrix pearlite content, parts after quenching hardnesscan not reach the design request, inclined disc friction surface when the temperatureis too high, the friction produced by the softening phenomenon, become the mainreasons affecting the quality of plunger pump.The alloying direct production of as-cast QT600-3swash plate castings, pearlitecontent was stable, is to solve the problem of axial piston pump swashplate due tofriction surface when the temperature is too high friction generated keytransformation softening problem.Copper is pearlite effective stabilizer, a large number of studies show that,addition of copper in ductile iron, the pearlite matrix, which makes the uniformhardness, wear resistance increasedExperiments show that, optimizing chemical composition, ensure the chemicalcomposition of molten iron, high carbon, low silicon, low phosphorus, sulfur, andadding alloying elements copper amount, control of spheroidization and inoculationprocess, tapping temperature control in1420℃~1450℃, pouring temperature at1360℃,60minutes after pouring high-temperature box, can obtain the production ofaxial piston pump swashplate friction parts requirements of qualified castings.The production test shows that, QT600-3castings by nodular cast ironproduction technology, reliable mechanical properties, microstructure. Fully meet the swashplate piston pump friction parts production requirements etc.. The plunger pumpswashplate friction parts due to friction surface when the temperature is too high, thefriction generated softening problem. Improve product quality and reliability. |
