It can be seen from Fig. 1 and Fig. 2 that the inner cavity of the casting of the electro-hydraulic valve body is complex, resulting in the difficulty of sand cleaning of the casting oil channel. After many process improvements and trial production, the sand core is finally soaked...
(1) there are two slender oil passages in the casting of electro-hydraulic valve casting, and it is difficult to form the slender sand core; (2) the wall thickness of the valve casting is uneven and the material is high-strength nodular cast iron. When casting with green sand, it is...
The casting structure of the electro-hydraulic valve casting is complex (as shown in Figure 1), with two slender and curved independent oil passages, each with a length diameter ratio of 20 (as shown in Figure 2). When casting these two oil passages, the sand core is made by the...
Electro hydraulic valve casting is a kind of hydraulic control element. Its control pressure is much higher than that of conventional valve casting, and its structure is also complex. In order to ensure the service performance of electro-hydraulic valve casting, it has high requirements for valve casting. The casting...
The figure shows the solidification of cast steel valve body castings at different times. It can be seen from the figure that during the solidification and cooling process, the liquid metal basically solidifies from the thin part to the thick part. The temperature of the hot joint at the...
1. Floating core There are regular pits on the upper surface of nodular cast iron. After dissecting the nodular cast iron, it is confirmed that the thin and flat oil cavity sand core floats to the upper surface of the cavity after breaking. The defect condition is shown in...
1. Test process parameters Three nodular iron castings were tested and poured. The main parameters during the test are: the tapping temperature of molten iron is 1492 ℃; Pouring temperature: 1386 ~ 1362 ℃; The pouring time is 21 s, 18 s and 20 s respectively; The pouring temperature...
The casting adopts the green sand production process, and the sand core is made of coated sand. The mold plate is arranged as 1 piece / mold. The profile of the casting is shown in Figure 1. 1. Shrinkage Due to the complex structure of the inner cavity of...
Excavators are widely used in highway, bridge, construction, breeding pond, underground engineering, emergency excavation and other engineering construction fields. It is characterized by large power and high efficiency. The hydraulic multi-channel valve control system is one of the heart components of excavator, and the multi-channel valve body is its...
For example, the liquid filling state of the casting at different times is represented. The red represents the molten metal liquid. According to the temperature range on the left, the temperature of the metal liquid can be roughly judged according to the color, and the gray area is a...