Method of CNC automatic programming for gear hobbing based on standard template and expression driving

Abstract

The invention discloses a method for CNC automatic programming of gear hobbing based on a standard template and expression driving. The method includes the following steps: 1, through a human-computer interaction interface, a numerical control programmer selects a workpiece and a tool and sets necessary machining parameters; 2, a mathematical model corresponding to a gear in a hobbing model base is automatically called by a system, point coordinate values of tooling paths are calculated, and all technological parameter data needed by the machining are confirmed; 3, according to an NC standard template structure and a NC standard template module, the NC standard template of the gear is automatically generated, and a gear template base is built; and 4, the system calls the NC standard template from the gear template base and intensively extracts parameter values from the technological parameter data, instantiation of the NC standard template is completed through an expression driving algorithm, and a numerical control program is obtained. The method for the CNC automatic programming of the gear hobbing based on the standard template and the expression driving has the advantages of being capable of achieving the automatic programming of the gear hobbing.

Description

technical field [0001] The invention belongs to the application of numerical control machine tools, and in particular relates to a CNC automatic programming method for gear hobbing. Background technique [0002] The existing programming methods of numerical control machine tools (CNC) mainly include: (1) manual programming; (2) CAD / CAM technology in graphic interactive mode; (3) parametric programming method using CNC system macro command (R command) template . The traditional method of manually compiling NC programs has disadvantages such as low efficiency, high error rate, and only applicable to the processing of a single part. The CAD / CAM technology in the form of graphic interaction can realize automatic programming and has good versatility, but it needs to establish a CAD model of the part to be processed, and carry out corresponding process planning and tool definition. The processing cycle is long and the workload is heavy. The higher requirements affect the process...

AI Technical Summary

Problems solved by technology

The traditional way of manually compiling NC programs has disadvantages such as low efficiency, high error rate, and only applicable to the processing of a single part.

The CAD / CAM technology in the form of graphic interaction can realize automatic programming and has good versatility, but it needs to establish a CAD model of the part to be processed, and carry out corresponding process planning and tool definition. The processing cycle is long and the workload is heavy. The requirements are high, which affects the processing cost and production efficiency

Using the parametric programming method of the CNC system macro command (R command) template, the CNC machining of a single product can be realized, but the similarity in the structure and process between the workpieces is ignored, and it is only suitable for a single machine tool of a specific CNC system. Other machine tools of the CNC system or machine tools of different CNC systems need to redefine the R command parameters, which leads to a large amount of repetitive work and insufficient adaptability

At present, people have not found an automatic programming method suitable for ordinary CNC machine tools, but for the manufacture of general-purpose parts with relatively fixed structural features, it is feasible to study a relatively general, fast, efficient, low-cost automatic programming method that can adapt to a specific processing environment and has practical value

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