In today's increasingly environmental-friendly society, the engine is constantly being upgraded, and the explosion pressure is constantly increasing. How the engine cylinder head material adapts to the corresponding increase in the thermal load of the cylinder head becomes the current situation. The industry is in urgent need of solving the problems. Recently, FAW Xichai made significant progress in the manufacturing technology of vermicular iron materials and took the lead in realizing the industrialized application of high-strength vermicular cast iron on the cylinder head, which has been installed in batches into the market and has caused widespread industry insiders. attention.
FAW Xichai Aowei Engine
Break through traditional fearless exploration
Tracking Xichai's success in realizing the industrialized application of the technology of vermicular cylinder head cover material in commercial vehicles, each step is marked with the rigorous and meticulous team of the Xichai Casting Technology Group, dares to break through traditions and dare to challenge the limits of the brand. As early as 2010, Xichai inherited the advantages of vermicular cast research and comprehensively promoted the industrialization of high-strength vermicular cast iron, and finally achieved fruitful results.
As we all know, the difficulty in the casting of vermicular iron is that the stable area of ​​the vermicular iron is too small, and the size and position of the platform in the stable area vary with the product. Magnesium as a vermicularizer needs to be controlled very precisely. In order to solve the problems, the Xichai Foundry Crafts team and Tin Cast have started close cooperation. In 2010, the project team relied on independent technology and adopted the explosive method to produce a creep cylinder head with a creep rate of 60-80% and a tensile strength of the main body test rod of ≥ 380 N/mm2, and a diesel engine with a pressure of 180 bar was passed. 2400 hours of endurance test. On this basis, in order to improve the performance and stability of materials, the project team also developed a vermicular iron material with a tensile strength ≥450N/mm2 and adapted to a higher detonation pressure diesel engine in 2012 with international cooperation. Pearlite content and other key indicators reached a higher level, the process is also more stable. At the same time as the material research and development, the project team also started the research on the casting process of a new machine cylinder head using vermicular material, and solved the double water jacket structure problem. At present, the casting scrap rate has been controlled within a reasonable range, and the batch volume has been fully satisfied. Production requirements. In order to meet the low-cost requirements of some models, in 2014 the project team developed low pearlite vermicular iron materials with tensile strength ≥ 400N/mm2.
Cooperative development leads the industry
Due to the excellent mechanical properties of vermicular cast iron (CGI) and the large amount of desorption during the vermicularization process, the cutting load is increased by 20% to 30% compared to the gray cast iron in the graphite structure, and the cutting performance is drastically reduced. In the initial stage of trial production, in order to overcome a series of problems such as abnormal consumption of a wide range of tools for cylinder head machine tool addition and unstable accuracy, the Xichai project's craft team also established a research route for outreach, with Sandvik, Kennametal, Walter, Guhring, Mapal, etc. A group of world-renowned tool manufacturers have been working closely together. Through the combination of “special sample test + production line verification†in the laboratory, a comprehensive analysis and evaluation was made of the cutting performance, reference parameters, and machine tool fixtures of the vermicular iron materials, resulting in a relatively complete tool processing solution. The problem of the efficiency and cost of the vermicular engine. Since 2013, the creeper cylinder cap has been put into the market in batches. With its high reliability and stability, it has gained market reputation.
The facts prove that with high-strength vermicular cast iron, engine designers can improve engine performance, fuel efficiency and durability while reducing engine weight and noise and emissions. At present, Xichai has directly adopted the creeper cylinder heads on some models of the main platforms of the State V and State IV, and will gradually expand to cylinders and other important parts.
Xichai takes the lead in applying high-strength vermicular iron material technology to domestic commercial vehicle engines. Whether it is improving the reliability and brand reputation of diesel engines or considering energy saving and environmental protection, Xichai has important leadership in the application of new technologies in China's commercial vehicle industry. Sexual significance.
Laboratory hopper mixer is mainly used for the tests of mixing different components of dry powders with dry powders, granules with granules, or powders with granules in laboratories. It is an ideal machine for exploring the best process parameters in material mixing, and a mechanically and electrically integrated advanced experimental machine.
Features:
The laboratory mixer is installed on a moveable base. Its main parts include machine frame, rotation system, electric control system, hopper, etc. The conical mixing hopper is mainly composed of hopper, hopper cover, ferrule, butterfly valve, etc.
The hopper that can rotate at 360° is installed on the rotation shaft by adopting the cantilever fixing mode. As the symmetrical axis of the hopper forms an included angle with the rotary arm rotation axis, different components of materials will make three-dimensional movement in the closed hopper, producing strong turning and high shearing and achieving the best mixing effect.
The rotation system is a key system for completing the mixing function. The rotary motor is a low speed high torque speed reducing motor, which is the power unit for mixing. The rotation shaft is installed with sensing components. When the gyrator turns to the set position, the sensor installed on the machine frame sends the sampling signal. The signal passes through the PLC system, which reads the hopper rotation speed and position information, continuously displays rotation speed and accumulated number of revolutions on the touch screen, and sends stopping instructions according to the set time. The hopper stops rotation, and stops at the best discharging position under the action of the brake motor.
The electric control system is mainly composed of two parts such as the electric cabinet and sensor. The core control parts PLC controller and frequency converter are installed in the electric control cabinet. During the use, the operations of electric appliances are mainly completed on the operation panel (touch screen) of the electric control cabinet, including printer, touch screen, power switch and emergency stop switch. The touch screen displays running time, rotation speed, etc.
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Jiangyin Jirui Machinery Manufacturing Co,LTD , https://www.jiruimachine.com