Will the steel piston

Recently, Federal-Mogul actively promoted steel piston technology in China and claimed that with the implementation of the national standard, steel piston has great demand in the field of heavy-duty diesel engines in China. This reporter has learned that the domestic automotive piston manufacturing enterprises and research institutions are also engaged in forging steel piston research and industrialization, such as Bohai Piston has launched a "high-power low-emission engine forging steel piston technology research and development and industrialization" project.

On April 11, Xu Yuliang, assistant to president of Quanchai Group, told reporters that at present, the aluminum alloy piston (the "aluminum piston") all used in Chai Chai is currently used. Adapt to the trend of lightweight, Cummins, Yuchai, Weichai, Chai and other engines at home and abroad are made of aluminum alloy piston. So, when the aluminum piston "popular", why the steel piston after 2017 will be great development? What are the advantages of steel piston aluminum piston is difficult to achieve? With these questions, the reporter interviewed a number of well-known domestic and foreign piston and diesel engine business. The company is located in:

Pistons must be synchronized with the engine upgrade

"The world's earliest automotive engine piston is cast iron, our country is the same.Afterwards, aluminum alloy material with its light weight, good thermal conductivity and low expansion coefficient and other characteristics of the vehicle engine companies have been favored and began industrial manufacturing. April 11, Shandong Binzhou Bozhou Piston Co., Ltd. Assistant General Manager Liu Shiyang said that with the rapid development of high-horsepower engines, especially heavy-duty diesel engine turbo, the application of cold technology and large bore diameter high compression ratio, Low emission requirements continue to increase. Traditional aluminum piston material can not meet the requirements of its use, so many domestic and foreign piston material research institutes and manufacturers launched many new piston materials, such as forged steel, ceramics and composite materials. According to report, the current ceramic, composite piston and other over-cost technology is still not fully mature.

Liu Shiying told reporters: "The earliest steel piston used in 1955 Germany ELSBETT single cylinder diesel engine, ELSBETT company first applied for a patent in 1977, in 1984 the company used automatic production line forged steel piston, starting in 2000 for the United States Caterpillar produces steel pistons, and foreign steel pistons are now widely used on high-performance medium and heavy-duty diesel engines from companies like Mann, Caterpillar, Cummins, Daimler, Volvo and Mercedes-Benz. "Relevant person in charge of China Mailer told Reporter, following the heavy commercial vehicles and racing engines, steel pistons are currently being gradually used in passenger cars and diesel engines in Europe and the United States.

Steel piston to meet the high-performance diesel engine specifications

Compared with aluminum piston, steel piston technology in the end what are the advantages to meet the needs of high-performance heavy-duty engines?

In an interview, Liu Shiying told reporters: "The quality of aluminum pistons is light, the reciprocating inertia is small, the manufacturing cost is low, but it can not meet the requirements of high-performance diesel engines. However, the steel pistons are competent and the piston compression ratio is small, which can reduce the overall height of the engine At present, the high cost of manufacturing, including rough and machining, is also high for manufacturing technology and equipment, but the cost of industrialization will drop significantly.

       Norbert Schneider, Global Applications Engineer for Federal-Mogul / Powertrain / Energy, Industrial and Transportation Pistons at Federal-Mogul Piston Technology Exchange Conference held in late February of this year, also briefed reporters on the advantages of steel pistons. "First of all, our steel pistons feature a double-friction welded structure with a large, enclosed, high-rise cooling passage that provides excellent high temperature resistance and withstands the high cylinder pressures of heavy commercial vehicle engines." Second, Throat temperature can be reduced as much as 50 to 100 degrees Celsius.When the maximum load of the closed welded oil gallery structure can still reduce the deformation of the piston ring groove as high as 80%, enhance the fatigue strength of the throat design up to 4 times, so that we can effectively solve the five And the six national standards on the heat load, mechanical load, friction wear and cylinder cavitation and other aspects of the proposed high-level requirements Third, the unique piston pin hole process greatly enhances the reliability of steel pistons, special weight-loss design The lightweight design of the steel piston is achieved, while the low-friction coating significantly reduces piston friction loss, all of which greatly improve piston reliability and reduce carbon dioxide emissions. "

       Mahler company official told reporters that the EU NEDC condition test showed that, compared with the aluminum piston, Mailer steel piston equivalent to save 3% of the fuel. By reducing friction losses and improving thermodynamics, steel pistons have significant potential for reducing carbon dioxide emissions.

High explosive pressure will change the rules of the game

"Explosion pressure is a key factor in changing the rules of the game throughout the engine industry." Norbert Schneider told reporters that the implementation of emission standards in the country five, six countries, China's automobile engine will have a greater change, especially heavy-duty diesel engine pairs Demand for steel pistons will continue to rise.

Outbreak pressure is the highest pressure in the engine cylinder, which determines the power output of the engine and emissions. Norbert Schneider briefed reporters on the evolution trend of engine outbreak pressure in developed countries in Europe and the United States. In 1961 only 110bar, 2000 rose to 180bar, then accelerated to 240bar a few years later, is expected to reach 270bar by 2020. At present, the outburst pressure of Chinese car engines is lower than 180 bar. However, Norbert Schneider judged that the commercial car explosion pressure will reach 180 bar or above, close to the pressure area where the steel piston explodes. Therefore, China's national emission standards to achieve five, the steel piston technology will have "military presence."