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Characteristics of the manufacturing process of vacuum solenoid valve
Compared with other manufacturing processes, the manufacturing process of solenoid valves has the following characteristics:
(1) the manufacturing process and inspection process of the solenoid valve blank are rather complicated.
The casting blank of solenoid valve is a complex thin-walled shell part. The casting requires smooth surface and clear casting, especially with dense defects. In order to meet the requirements mentioned above, a series of technological measures should be taken in casting, such as selecting high refractory molding materials and controlling the moisture of the molding sand. The molding should be layered to ensure the hardness of the sand mold. The proper casting mouth system and strict control of the pouring speed and temperature are adopted. Because of the high technical requirements, the casting process of the solenoid valve blank is far more complicated than the ordinary casting.
In addition, in addition to checking the size, position accuracy and appearance of the solenoid valve, there are many kinds of inspection such as metallographic organization, mechanical properties, corrosion resistance and nondestructive testing, so the inspection technology of the solenoid valve is also more complex.
(2) the difficulty of mechanical processing
Because of various kinds of solenoid valve materials, the cutting performance of most high strength, corrosion resistant and hard materials is very poor except for various kinds of cast iron and carbon steel. It is difficult to make the parts reach the required machining precision and surface roughness. The accuracy and surface roughness of the solenoid valve's cover are very high, so the machining difficulty of the solenoid valve is increased. At the same time, the cutting performance of the solenoid valve material is poor, and it also brings a lot of new problems to the processing method of the solenoid valve, the cutting tool material, the cutting amount and the technology and equipment.
It is difficult to install the parts of the solenoid valve on the machine tool
The structure and shape of the main parts of the solenoid valve are rather complicated. Some parts are thin, thin and long, with poor rigidity. When machine tools are processed, positioning and clamping are difficult, so complex special fixtures are often needed.
Some solenoid valve parts, positioning base surface accuracy is low, the surface roughness is high, sometimes even using non machined surface positioning. The accuracy and surface roughness of the machined seal surface are very high, so it is difficult to guarantee the machining quality. Therefore, in order to meet the needs of the process, it is often necessary to improve the precision of the base surface and to reduce the surface roughness, or to process the positioning base surface on the non machined surface, which increases the complexity of the manufacturing process of the solenoid valve.
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