Research On Quasi-intermittent Vibration Assisted Swing Cutting Device And Its Key Technologies

In recent years,Elliptical vibration cutting(EVC)technology has been greatly developed.The unique friction reversal and intermittent cutting characteristics of this technology make this method recognized as one of the most promising technologies for difficult-to-machine materials.In the process of long-term technical production and application,due to its unique elliptical vibration tool path,the technology has a certain degree of cutting residue height that cannot be eliminated,which limits the further improvement of the technology in terms of machining accuracy.Quasi-intermittent vibration assisted swing cutting(QVASC)is developed on this basis.This technology inherits the advantages of EVC while a lleviating the limitations of EVC.In this dissertation,a QVASC device is designed and researched on the basis of it.The main contents are as follows:1)Design a new type of non-resonant two-degree-of-freedom Q VASC device.An "X"-shaped flexure hinge(XFH)is used to suppress the mutual interference between the two drive shafts and realize the movement decoupling of the device.Comprehensive considerations are made in kinematics,dynamics and flexible device design,and the mechanical configuration and geometric parameters of the device are designed.The pseudo-rigid body model and the flexibility matrix method were applied to kinematics and flexibility analysis respectively to establish theoretical models,which were verified by finite element analysis.2)Perform performance test on the developed QVASC device.Use air-floating vibration isolation platform,capacitive displacement sensor,controller and other equipment.Under the closed-loop control system,various performances such as working stroke,resolution,response speed,closed-loop tracking and crosstalk are tested for the developed QVASC device to investigate the working performance of the device in the actual processing environment.3)For the developed QVASC device,a matching tool path generat ion strategy is proposed.According to the QVASC system,the tool space pose and tool geometric parameters are analyzed,and on this basis,the tool position point is modeled.Use H'ermite spline interpolation theorem for interpolation.Three typical optical free-form surfaces,sine surface,sine mesh surface and toric surface,are used as examples to simulate the tool path generation strategy.4)Carry out on-line processing experiments to verify the developed QVASC device.For typical aluminum alloy materials,a comparative analysis of the machining surface quality of EVC and QVASC;a comparative analysis of the machining surface quality under the conditions of different spindle speeds and different feed speeds.Typical optical free-form surfaces such as unidirectional sine surfaces,sine mesh surfaces,and toric surfaces are used as examples to characterize the tool path.The online machining experiment is carried out with the sine mesh surface as the target surface,which verifies the effectiveness of the tool path generation strategy.