THE FAILURE ANALYSIS OF DROPPING ON THE CYLINDER IN HYDRAULIC PUMP OF YZB TYPE
XIONG Zhi-wen (Center Laboratory of Guiyang Aviation Hydraulic Co., Ltd, Guiyang 550202, China)
In the operating period, the cylinder in hydraulic pump of YZB type was dropping. By means of the optical microscope and the scanning electron microscope (SEM), the failure of copper alloy cylinder was analyzed. The reason of the cylinder dropping is concerned with the casting quality of cylinder blank. The main factors which have an effecton the cylinder blank quality was that the pouring temperature is lower, freeging speed is faster and the stirring in melting is not homogeneous.
【CateGory Index】： TH137.51