Modeling of double circular arc gear based on CAM

Gear pump is widely used in hydraulic system. Compared with traditional involute gear pump, double-arc gear pump has advantages of good bearing capacity, stable flow pulsation and low noise. The rotor of the double-circular-arc gear pump adopts double-circular-arc helical gears, and its basic end face tooth profile is generally formed by connecting the upper and lower arcs through a transition curve. Some domestic scholars have studied different transition curves, further improving the flow pulsation and noise problems by changing the tooth profile, and have made a lot of research results. In order to realize the modeling and processing of parts, the corresponding processing route is formulated by analyzing the processing difficulties of the special position and surface of the shoe sole mold cavity plate, and the UG NX CAM module is used to complete the programming and simulation cutting.

The mathematical model of the saddle surface is programmed and operated by MATLAB software to generate the key points of the mathematical model, and the accurate 3D solid model of the saddle surface is established by using the command of UG midpoint generating surface. At the same time, with the progress of simulation processing technology, the processing program has been optimized and verified using simulation processing software to reduce the occurrence of processing errors, over-cutting, collision and other phenomena, and the machine tool processing results show that it meets the expected requirements, reducing the problems caused by machine tool processing.

In order to improve the machining efficiency of double circular arc gear under the premise of meeting the requirements of use, the involute form of transition curve double circular arc helical gear is first designed, and according to the tooth shape parameters, the UG12.0 software is used to carry out 3D modeling of the double circular arc gear, and the CAM module is used for simulation processing, and the UG post-processing module is used to generate the CN processing program, and finally the milling simulation processing is carried out in Vericut, It verifies the rationality of the design and the correctness of the NC machining program, and provides certain reference value for the modeling and machining of helical and irregular gears.

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