The Rongcheng Die-Casting Company Ltd.of Chongqing is located in the High-tech Industrial Garden of Chongqing City.It is a private-owned enterprise which mainly produces cylinder bodies for matorcycles,repair parts for automoble air-conditioners.cy linder heads for all-purpose engine and the like .The company serves as a backbone support factory for such big enterprises as Zongshen Group、Longxin Group、Jialing Group、and Construction Group.
After more then ten yeare of endeavor,the company now holds more than 180 sets of die-casting machines,3-D detectors.machining centers and so on .with an annual output capacity of two million sets of cylinder bodies,automobile repair pars and distributor blocks of various kinds.Due to its stable quality and reliable performance,the company enjoys a high esteem anlong its costumers with its motto of"Honesty,Innovation.llumanity,and Culture".A high-tech product of ion cylinder body with the brand of "Rongshen"has recently been developed with success by the company.
Introduction of Ion Cylinder Body-Suitable for Motor Tricycles To produce the ion cylinder body,the interior surface of cylinder liner is heated with an ion beam at super high spccd and has a mesh-like ion-hardencd layer formed on itself.As a beam with high energy density,the ion beam can have a core temperature of 10000℃,With such an ion beam bating the interior surface of cylinder liner,a steep temperature gradient will be formed such that a thin layer of the cylinder liner interior surface warms up rapidly with a tempcrature of above its phase transition point .After the ion beam is removed,the heated region cools down rapidly due to conduction of the cylinder liner inself,thus forming a fine structure of high hardness like white iron or hidden acieular martensite.Hardness of normal phosphide-vanadium cast iron and boride cast iron is 300IIV,In conlrasl.after being hardened by ion.it can reach 800~900HV with a depth of 0.10~0.25mm.With a structure of hidden acicular martensite and flake graphite,the hardened region at the interior of the cylinder body becomes a hard skeleton.Since the pison ring is in constant contact and allrition with the hardened region while reciprocating inside the cylinder lincr,the wear resistance o the cylinder liner will be significanty improved.According to fast wear experimenls on ion cylinder liner assenmbly of motorcycles.the attrition wear is only 0.015~0.02mm after constant running of 400 hours,Which translates to a service life tree timcs of that of normal cylinder body.