Method, device and system for stable EDM adaptive machining
A technology of electric spark and machining machine tool, applied in the field of electric machining, can solve problems such as the increase of control variables, control failure, and oscillation, and achieve the effect of meeting advanced prediction real-time control, reducing detection errors, and small phase shift
Inactive Publication Date: 2019-04-02
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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Problems solved by technology
[0003] In the process of realizing the present invention, it is found that the prior art has at least the following problems: because the discharge state is used as the monitoring signal, for the sake of insurance, the actual detected discharge state value will be larger than the theoretical discharge state value
Correspondingly, the control variable will increase sharply, forming a vicious circle, causing shocks, and making the control invalid
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[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0033] Electric discharge machining is a special processing method that uses the electric erosion effect to remove conductive materials when the pulse discharge between the two electrodes immersed in the working fluid is used. It is also called electric discharge machining or electric erosion machining. ).
[0034] Among them, the EDM process is a weak steady-state process, that is, its linear characteristics such as mean value, variance or energy spectrum fluctuate within a small range during the effective processing stage. If there are conditions such as oil flushing or poor chip removal during machining, harmful machining will occur and damage the workpiece. The emerg...
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The invention provides a stable electric spark self-adaptive machining method, device and system and belongs to the technical field of electric machining. The method comprises the steps that smooth treatment is carried out on the discharging state value of the current moment according to a smooth functional model; corresponding machining process model parameters are recognized according to the discharging state value subjected to smooth treatment; a control signal of the next moment is worked out in a self-adaptive control mode according to the discharging state value subjected to smooth treatment and the machining process model parameters; and the next cutter-lifting cycle of an electric spark machine tool is obtained based on the control signal of the next moment. According to the method, smooth treatment is carried out on the discharging state value of the current moment according to the smooth functional model, the control signal of the next moment is worked out in the self-adaptive control mode according to the discharging state value subjected to smooth treatment, therefore, change of the control signal is slowed down, arcing caused by dramatic change of the control signal is reduced or avoided, and accordingly stability of the self-adaptive control process of electric spark machining can be improved.
Description
technical field [0001] The present invention relates to the technical field of electric machining, and more specifically, to a method, device and system for stable electric spark adaptive machining. Background technique [0002] With the development of electric machining technology, electric discharge machining has been widely used in production due to its outstanding advantages such as high machining accuracy and low manufacturing cost. The EDM process is a weak steady-state process. If the oil flushing or chip removal conditions are bad during the machining process, the system will enter an unstable state and the fluctuation of the discharge state will increase, which will cause burns on the surface of the workpiece and affect the processing efficiency. Therefore, how to control EDM is a key issue. The existing EDM adaptive control method mainly uses the discharge state as the monitoring signal, and obtains the control signal through the adaptive control method, thereby a...
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IPC IPC(8): B23H1/00
CPCB23H1/00
Inventor 周明徐萧异窦蕴平
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE