Practice of the spindle frame centrifugal integrated instrument in the CNC gear hobbing machine

The application range of the machine tool has been expanded. The general top is integral. It is not possible to adjust the eccentricity, and it cannot be disassembled. The mechanism is assembled and can be replaced according to different working objects, thereby expanding the application range of the machine tool.

The outer tapered surface of the cone sleeve in this mechanism is the standard taper, which is matched with the inner cone hole of various machine tool spindles, and the top is assembled. When the working object of the machine tool changes, the top can be replaced at any time, and even the other can be replaced. Positioning elements, such as cone plugs, external positioning claws, and the like. Because the gear of the machining object on the CNC gear hobbing machine may be positioned in the mandrel through the inner hole, it may also be positioned directly in the inner hole, and the gear may be positioned by the top circle when measuring, so timely replacement of the tip can expand the scope of use of the machine tool.

Adjustment and maintenance is more convenient. After using the CNC gear hobbing machine for a period of time, various errors will occur. If the functions in CIMS such as CAD/CAM/CAPP/NCP are abstracted into a series of independent functional modules, then these functional modules are integrated. Can form a specific CNC system [1]. Integrated numerical control is the development direction of numerical control system. Its purpose is to provide an effective collaborative working environment for each independent department in the production process to adapt to the cooperative, rapid, economical and smooth realization of two-way flow and greatly improve production. effectiveness.

It is an urgent requirement to adapt to the development of modern manufacturing industry by constructing a cylindrical cam integrated CNC system based on STEP-NC, changing the traditional cylindrical cam design and manufacturing method, and improving the manufacturing capacity of cylindrical cam.

The STEP-NC standard is different from the traditional G and M codes (ISO6983). STEP-NC (ISO14649) extends the product model data conversion standard STEP to the CNC field. It requires the CNC system to directly use CAD 3D products that conform to the STEP standard (ISO10303). The data model (including workpiece geometry data, setup and manufacturing characteristics), plus process information and tool information, directly generates machining programs to control the machine [2, 3].

STEP-NC defines a new STEP application protocol (AP238) in object-oriented form as a data exchange specification between CAM and CNC. AP238 covers all the information needed for the whole process from concept to finished product (parts), including 3D geometric information (AP203/AP214), feature information (AP224), process information, and detection information (AP219).

The basic principle of STEP-NC is to program based on manufacturing features, and the program itself uses the file format specified by ISO10303. It tells the CNC what "processing", rather than programming the tool movement directly, and telling the CNC how to "process". It uses the working steps as the basic unit of the processing flow, and associates the features with the technical information. Each work step defines only one specific operation ("what to do", "how to do", etc., but only one type of tool and one Strategy).

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