With the enhancement of China’s national strength, China’s scientific level has been greatly improved. At the same time, it has driven the rapid development of the automotive industry, and the automotive rack and pinion industry has also been rapidly improved. At the same time, auto parts enterprises are facing great competitive pressure, and they are facing the shortening of parts production time; More and more varieties; The price is getting lower and lower; The service level is getting higher and higher, which is difficult.
As a key component to change the driving direction of the vehicle and maintain the stable and straight driving of the vehicle, the automobile rack and pinion steering gear also faces the same pressure. If the design of the steering gear of each new model is completed by the designer, it will not only have a large workload, but also reduce the design efficiency, but also prone to some unexpected errors. Moreover, although the rack and pinion steering gear is different, its components are generally similar in structure, but there are differences in size. In order to improve the product design efficiency of rack and pinion steering gear, parametric design of rack and pinion steering gear is a feasible and very good method. However, using the parametric function of CATIA software, we may find the following problems in parametric design:
(1) The necessary calculation formula in the parametric design of rack and pinion steering gear is insufficient, and it is impossible to update the model through the formula connected with the outside.
(2) There is no correlation and necessary constraints between the parameters in the parametric design of rack and pinion steering.
(3) In the parametric design of gear rack steering, the parts, calculation formula and verification cannot be combined, which makes the parametric design inconvenient.
(4) The management of new parts and template parts has not been well solved in the parametric design of gear rack steering.
(5) In the parametric design of rack and pinion steering, the relationship between variables and parameters cannot be determined by expression.
These deficiencies will make the research and development cycle of rack and pinion steering gear slow and the research and development efficiency low, which seriously reduces the research and development speed of rack and pinion steering gear. Therefore, CATIA secondary development is needed to carry out parametric design of rack and pinion steering gear. After the parametric design of the rack and pinion steering gear is carried out by CATIA secondary development, the user inputs the relevant parameter values every time, and realizes the parametric modeling by running the background program code. Once the code passes the test, there will be no problems. When the designer designs by himself, it can avoid the inaccuracy of the model due to human negligence or insufficient design experience to the greatest extent. This will improve the efficiency of product design and reduce the design cost, so as to have stronger competitiveness.