| The quality of automobile wheels has an important influence on the maneuverability,stability and comfort during driving,and even the safety of occupants.As an important part of the hub processing technology equipment,automobile hub clamps are related to the processing quality,productivity and processing cost of the hub.Traditional fixtures have a single clamping size,and the installation process is complicated and cumbersome.It requires manual adjustment or replacement of different fixtures to process different types of wheels.It is no longer suitable for the flexible processing needs of today’s diversified and personalized wheels.Therefore,designing a flexible fixture that can meet the processing of hubs of different specifications and sizes is of great significance for improving the processing quality and productivity of the hub and reducing the processing cost.In this paper,through the analysis of the processing technology of the hub in the first sequence of the hub processing production line,we researched and designed a flexible clamp for automobile hubs that was suitable for the sequential processing of hubs of different sizes.The main work and conclusions of the paper are as follows:1 、 Analyze the technological requirements in the sequential processing of automobile wheels,clarify the working purpose and working principle of the fixture,determine the positioning plan and clamping plan of the fixture,and complete the structural design of the fixture;2、 A fixture error mapping model is proposed to analyze the positioning errors of the designed flexible machining fixture for automobile wheels.According to the given machining accuracy of the automobile wheel hub,the position error and attitude error of the fixture positioning element are calculated based on the error mapping model using matlab software;3、Design the key parameters of the hub’s flexible machining fixture,clarify the clamping stroke and effective clamping force range of the fixture,and provide guarantee for the fixture to achieve reliable flexible clamping;4 、 Through the finite element simulation in ANSYS Workbench software,the static structure simulation and modal analysis of the designed fixture structure were carried out respectively.Verify whether the fixture structure is safe through static analysis,and obtain its natural frequency and corresponding vibration mode through modal analysis,to provide a reference for avoiding resonance phenomenon during the use of the fixture;Through the work in this paper,a kind of flexible machining fixture for automobile hubs with reliable clamping is designed,which can realize the reliable clamping of hubs with different sizes without changing the clamps.It saves the processing cost of the wheel hub andprovides technical support for the construction of a flexible production line for automobile wheels. |
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