Hydraulic valve body plays a key role in hydraulic system, and its processing accuracy directly affects the performance and reliability of the system. The following is an explanation of the processing accuracy requirements and control methods of hydraulic valve body.
First of all, the dimensional accuracy requirements of hydraulic valve body processing are extremely high. The various apertures, hole spacings, valve core matching dimensions, etc. of the valve body need to be strictly controlled within a very small tolerance range. For example, the tolerance of the key aperture may be only a few microns or even smaller, because these dimensions directly determine the flow and pressure control accuracy of the hydraulic oil. For the hole spacing, the precise size can ensure the correct positioning and smooth movement of the valve core in the valve body. In order to achieve such dimensional accuracy, high-precision processing equipment, such as precision CNC machine tools, is required during the processing process, and the equipment is calibrated and maintained regularly to ensure that the positioning accuracy and repeat positioning accuracy of its moving axis meet the processing requirements.
Secondly, shape accuracy is also an important aspect. The shape of the internal flow channel and mounting surface of the valve body must meet the design requirements. For example, the flow channel surface should be smooth, and avoid uneven or irregular shapes, otherwise it will cause turbulent flow of hydraulic oil, increase pressure loss and generate turbulence. For the installation surface, the flatness requirement is very high, which can be ensured by precision machining processes such as grinding. During the machining process, online detection technology can be used to monitor the shape accuracy of the parts in real time, and once the deviation is found, the machining parameters or tool path can be adjusted in time.
Furthermore, the control of position accuracy cannot be ignored. The positional relationship between the various holes, grooves, and surfaces on the hydraulic valve body is crucial to the realization of its function. For example, the relative position of the oil inlet and outlet holes must be accurate to ensure that the hydraulic oil flows along the designed path. In machining, high-precision fixtures can be used to ensure the clamping and positioning accuracy of the workpiece, and advanced coordinate calculation methods and compensation algorithms are used in programming to reduce position errors caused by tool wear, thermal deformation of machine tools, and other factors.
Finally, the control of surface roughness is one of the keys to ensure the performance of the hydraulic valve body. Appropriate surface roughness can reduce hydraulic oil leakage, friction, and wear. For the sealing surface and the valve core mating surface, fine machining processes such as honing and polishing are required to make the surface roughness reach the extremely low value required by the design. During the machining process, it is necessary to reasonably select cutting parameters, such as cutting speed, feed rate and cutting depth, and select appropriate tool materials and tool geometry parameters to obtain ideal surface quality. In addition, a strict cleaning process is also essential to remove the chips and oil residues left during the machining process to prevent the surface quality from being affected.
