Spiral surface forming machining method

Abstract

The invention discloses a spiral surface forming machining method. The method comprises a step according to which a forming cutter matched with the spiral surface of a workpiece to be machined is selected to carry out forming machining on the workpiece to be machined. According to the method, before machining, the theoretical cross-sectional shape of the spiral surface of the workpiece to be machined is determined; the theoretical cross-sectional shape of the forming cutter is determined according to the theoretical cross-sectional shape of the spiral surface of the workpiece to be machined; the actual cross-sectional shape of the spiral surface is obtained according to the theoretical cross-sectional shape of the forming cutter; the actual cross-sectional shape of the spiral surface is compared with the theoretical cross-sectional shape of the spiral surface; if the maximum error of the actual cross-sectional shape of the spiral surface and the theoretical cross-sectional shape of the spiral surface is smaller than the accuracy of the workpiece to be machined, it can be determined that the obtained cross-sectional shape of the forming cutter satisfies requirements, otherwise, the actual cross-sectional shape of the spiral surface is made into a symmetric spiral surface cross-sectional shape relative to the theoretical cross-sectional shape of the spiral surface, and the symmetric spiral surface cross-sectional shape is adopted as a new theoretical cross-sectional shape of the spiral surface; and iterative computation is carried out until the error satisfies the requirements. With the spiral surface forming machining method of the invention adopted, the improvement of the profile accuracy of the forming cutter can be benefitted, the interference of the forming cutter and the workpiece to be machined can be decreased, and the machining accuracy of a gear can be improved.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a method for forming a spiral surface. Background technique [0002] Helicoid is a type of curved surface widely used in mechanical products, such as helical gears, cylindrical end mills and screw rotors, etc., and their surfaces are helicoids. In manufacturing, due to the complex forming of the helicoid, many technical parameters, strong manufacturability requirements, and difficulty in ensuring manufacturing accuracy, the research on its forming principle and processing technology has always been an important research topic in the field of mechanical manufacturing. [0003] There are many ways to process helical surfaces, among which forming processing is very important, such as forming grinding of gears, forming milling of screws, etc. The forming tool for helical surface machining is generally disc-shaped. During forming processing, the profile of the forming tool is tan...

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Problems solved by technology

[0004] In the case that the forming processing path has been given, the accuracy of the helicoid is determined by the profile accuracy of the forming tool. During processing, once the profile arc of the forming tool is located in the solid body of the workpiece to be processed, interference will occur. The tool will cut off the part of the workpiece to be processed that should not be cut, so that the required helical section cannot be guaranteed to be processed

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