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Interval type-2 fuzzy logic-based two-order fuzzy control method for micro electrical discharge

A type-two interval fuzzy and fuzzy control technology, applied in adaptive control, general control system, control/adjustment system, etc., can solve problems such as large uncertainty, insufficient integration of processing experience, and unstable processing process

Inactive Publication Date: 2011-05-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem that the complex nonlinear and multi-factor time-varying micro-EDM system is difficult to perform real-time, accurate and efficient control, and overcome the oversimplification of the average voltage method in the processing control and the processing experience in the control strategy. Insufficient integration and simplification of the adjustment amount are used to solve the difficult problems that the traditional fuzzy control system itself contains large uncertainties, which easily lead to unstable processing and low processing efficiency. The two-order fuzzy control method of micro-EDM expands the traditional fuzzy set into a type-two fuzzy set to improve the ability of the system to deal with uncertainties; at the same time, it also proposes the accurate classification and statistics of the discharge state in the analysis cycle of micro-EDM method to achieve precise control of micro-EDM control, thereby improving machining efficiency and machining system stability

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  • Interval type-2 fuzzy logic-based two-order fuzzy control method for micro electrical discharge
  • Interval type-2 fuzzy logic-based two-order fuzzy control method for micro electrical discharge
  • Interval type-2 fuzzy logic-based two-order fuzzy control method for micro electrical discharge

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Embodiment approach 1

[0049] Embodiment 1 In the micro-EDM system with the processing conditions as shown above, an aluminum plate with a thickness of 1 mm is selected as the workpiece, and the traditional automatic feed control method based on the average voltage method, the traditional type-one fuzzy control method and the present invention are respectively adopted. The proposed two-stage interval type II fuzzy control method processes 5 small holes each, and the average processing time is shown in Table 3:

[0050] The average processing time of the three processing methods in Table 3 Embodiment 1

[0051]

[0052] Through the comparison of the results of Embodiment 1, it can be seen that the processing efficiency of the application of the two-order interval-type two fuzzy control method proposed by the present invention is 41.3% higher than that of the traditional automatic feed control method based on the average voltage method, and it is higher than the traditional one-type fuzzy control me...

Embodiment approach 2

[0053] Embodiment 2 keeps the processing parameters unchanged, selects an aluminum plate with a thickness of 2mm as the workpiece, and still uses the above three control methods to process 5 small holes respectively. The average processing time is shown in Table 4:

[0054] The average processing time of the three processing methods in Table 4 Embodiment 2

[0055]

[0056] It can be seen from the results of Embodiment 2 that when the thickness of the aluminum plate workpiece is increased from 1mm to 2mm, that is, when the small hole depth-to-diameter ratio is increased from 10:1 to 20:1, the two-order interval type II fuzzy method proposed by the present invention is applied. The processing efficiency of the control method is 51.6% higher than that of the traditional automatic feed control method based on the average voltage method, and 31.6% higher than the traditional type I fuzzy control method. In addition, for the same processing experimental conditions, when the dept...

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Abstract

The invention provides an interval type-2 fuzzy logic-based two-order fuzzy control method for micro electrical discharge, belonging to the technical field of micro-EDM (electrical discharge machining), and relating to a detection and control method of micro-EDM discharge state. The method is characterized by comprising the following steps of: firstly causing the acquired voltage and current to pass through a first-order interval type-2 fuzzy logic system (FLS) to obtain a vector of the discharge state of a sampling point; making statistics of the vectors of the discharge states during one cycle to obtain the ratio of various types of discharge states in the cycle; and taking the ratio as input quantity, and finally outputting the feed speed of a micro-electrode through a second-order type-2 FLS. The control method provided by the invention has the beneficial effects of effectively overcoming the defects of oversimplification, simplification of regulating quantity and the like of an average voltage control method, and limitation of the traditional type-1 fuzzy logic technology in processing uncertainty, ensuring stability and accuracy of the control systems and the machining process, and obviously improving machining efficiency, thus being very applicable to micro-EDM.

Description

technical field [0001] The invention belongs to the technical field of micro electric discharge machining, and relates to a method for detecting and controlling the discharge state of micro electric discharge machining. Background technique [0002] Micro EDM has complex characteristics such as small discharge energy, high frequency of pulse power supply, small discharge gap, serious waveform distortion and large noise interference, which makes the processing process extremely unstable, and it is difficult to accurately detect and control the processing discharge state. The continuous increase of the discharge debris is more difficult, and the processing environment is getting worse, resulting in low processing efficiency. Therefore, realizing accurate detection of machining discharge state and real-time effective control of machining process, so as to ensure that machining is always in the best discharge state is the fundamental way to improve the efficiency and stability o...

Claims

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Application Information

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IPC IPC(8): B23H7/20B23H9/14G05B13/04
Inventor 贾振元张玲瑄刘巍李安超魏力
Owner DALIAN UNIV OF TECH