As a high load precision machinery, hydraulic components not only need to achieve accurate hydraulic transmission and control, but also to bear variable high-pressure load, which requires a very high quality of hydraulic components. Hydraulic casting is the foundation of high-end hydraulic components, and it is a bottleneck restricting the development of hydraulic components in China. With the development of hydraulic components towards high pressure, miniaturization and precision, the integration degree of castings becomes higher and higher and the structure becomes more and more complex.
Therefore, the casting quality of hydraulic components has become an important factor affecting the hydraulic technology. If we don’t pay attention to the development of hydraulic casting production, we can’t produce high-quality casting blanks, and there will be no high-quality hydraulic parts and advanced hydraulic technology. From this point of view, the hydraulic casting process is the foundation of the hydraulic industry, that is to say, the caster gets hydraulic pressure.
For a long time, the oil passage with small cross-section in the hydraulic valve body usually adopts the machining method, which leads to high production cost, long cycle and can not meet the market demand. Moreover, the volume of the hydraulic valve obtained by this production is large and the flow capacity of the valve is poor. With the development of the hydraulic parts towards the direction of small-sized and high-pressure, the application of “casting flow passage” is more and more widely, “complex flow” The casting of “Dao” promotes the realization of proportional technology, which makes the multi-channel valve change from piece to integral structure and accelerates the development of integration.
With the development of casting technology and the large demand of hydraulic components, most of the blanks of hydraulic components come from casting, accounting for about 76% of the total number of hydraulic components. These hydraulic castings are all blanks with dense material requirements, complex inner cavity shape and difficult production and manufacturing.