HS5 piston-type engine
In order to meet the requirement of the Y-5 multi-role aeroplane, ZEF started to produce HS5 engines in September 1956. These engines were manufactured after the Russian designated Ash-62IR with documents provided by the Soviet Union. It was a 9 cylinder, single row, radial, air-cooled piston engine with a single speed supercharger and a flat take off rating of 753 kW (1,000 hp) up to 1,500 m. This engine was bigger than M-11FR, and also more complicated. The factory made full use of the production conditions for M-11FR engines and only added a few machine tools. According to the Russian technical documents, it was required to use large internal grinding machines and planetary gear thread milling machines for vital tasks such as the boring of the inČner hole of the intermediate casing, the grinding of the hyperbola profile of the cylinder barrel's inner face and the milling of the sawtooth thread of the cylinder head. But the factory modified the conventional lathe and grinding machine to solve the problem.
The manufacture of the exhaust valve was a critical technology. The exhaust valve is hollow, filled with metal sodium of 40-60% of its volume and sealed. During the operation, the metal sodium vaporizes and sucks the heat, and then, through a guide sleeve, transfers it to the cylinder head. This reduces the temperature of the exhaust valve for extending its operational life. To make the exhaust valve, the following processes were needed: cutting of the hollow cavity, rolling of the rod, filling the sodium and sealing, chamfer of the mushroom head and coating of stellite alloy on the head of the value rod for wear-resistance corrosion-resistance. These processes were all highly difficult techniques and the filling of sodium and sealing was risky as explosion could occur. Jiang Xichung, the 8th grade skilled worker, and his colleagues actively studied and explored, and they worked together to solve the problems one by one. The exhaust valves made by this factory were not only used by HS5 engine but also satisfied the need for other types of engines.
The production for HS5 engine was successfully completed in June 1958. In 1986, more than 2,600 engines were built, and out of them 402 were used for CAAC ' s Y-5 and Li-2 aeroplanes.
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