Application status of CAD / CAPP Technology in precision forming process of bevel gear cold rotary forging

In recent years, the research and application of CAD / CAPP Technology in gear mostly focus on the design of gear parts and the machining process design of gear; However, there are few reports on the research and system development of applying CAD / CAPP technology to the process design process of cold rotary forging gear. At the same time, due to the limitations of computer technology in the past, the development of CAD system mostly adopts two-dimensional CAD design system, such as AutoCAD, etc; The system developed in this way can further carry out computer-aided design and analysis in the future, if any

Finite element analysis and cam have brought potential constraints and inconvenience. With the development of computer technology, especially the development of CAD technology, in recent years, professional 3D CAD / CAPP system has gradually emerged as the CAD platform for system development. It can effectively solve various problems brought by 2D design system, which will also become the trend of CAD system development in the future.

Because the precision forming process of bevel gear cold rotary forging involves the calculation and setting of many process parameters, such as the calculation of rotary forging force, the volume calculation of forging, the design of blank, the determination of feed rate, the correction of electrode tooth profile, etc., it is very complex to determine a complete set of process scheme, and the manual formulation of process scheme inevitably has many of the above shortcomings. These problems can be solved by applying CAD / CAPP technology to the cold rotary forging precision forming process of bevel gear. CAD system can design gear parts. CAPP system reads the relevant data generated by CAD system, which provides a basis for the later design of process parameters. CAPP system makes scientific decision automatically according to the design criteria, calculation formula and empirical criteria set in the system, and generates process technical documents. At the same time, the CAD system can design the tool electrode and die through the process data obtained in the CAPP system, and generate its CAD model, which provides the basis for the future cam design.

Therefore, it is a beneficial attempt and exploration to apply CAD / CAPP technology to the whole process design of cold rotary forging precision forming of bevel gear.