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A step-by-step self-adaptive fuzzy control method for metal-ceramic functionally graded material electric discharge machining

A functionally graded material and self-adaptive fuzzy technology, applied in metal processing equipment, electric processing equipment, circuits, etc., can solve the problems of inability to process through holes, different discharge characteristics and removal mechanisms, etc., to overcome the unstable discharge state, overcome Difficult to process ceramic layer, effect of improving effectiveness

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a step-by-step self-adaptive fuzzy control method for metal-ceramic functionally graded material electric discharge machining, to solve the problem of metal-ceramic functionally gradient material in gradient material electric discharge machining due to its different layer components and structural characteristics. The discharge characteristics and removal mechanisms of each layer in the process of small holes are different. In the conventional processing process, it is easy to have the problem that the through hole cannot be processed, and the same discharge parameters are used between different layers. Due to the difference in thermal conductivity of each layer The problem that different residual stresses exist between layers in the processed hole affects the performance and service life of metal-ceramic functionally graded material parts

Method used

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  • A step-by-step self-adaptive fuzzy control method for metal-ceramic functionally graded material electric discharge machining
  • A step-by-step self-adaptive fuzzy control method for metal-ceramic functionally graded material electric discharge machining
  • A step-by-step self-adaptive fuzzy control method for metal-ceramic functionally graded material electric discharge machining

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specific Embodiment approach 1

[0025] A step-by-step self-adaptive fuzzy control method for metal-ceramic functionally graded material electric discharge machining, the metal-ceramic functionally gradient material is a multi-layer composite functionally gradient material composed of a metal layer, a gradient layer and a ceramic layer, and the first processing starts Layer material is conductive metal layer; Described control method utilizes fuzzy controller model to realize, and fuzzy controller model is input quantity with short-circuit rate and spark rate, and pulse-to-pulse extension and speed variation are output quantities, and described input, output The membership interval of the quantity is:

[0026] Short circuit rate ∈ [0,1];

[0027]spark rate ∈ [0,1];

[0028] Intervein extension ∈ [0.5,4];

[0029] Speed ​​change ∈ [-2,2];

[0030] The process of using the fuzzy controller model to perform adaptive fuzzy control on metal-ceramic functionally graded material EDM is as follows: set the initial...

specific Embodiment approach 2

[0032] The difference between this implementation and the first implementation is that the pulse power supply is a transistor-controlled RC pulse power supply, and other steps are the same as the first implementation.

[0033] Figure 7 It shows the comparison between the step-by-step adaptive fuzzy control strategy and the conventional control method for the processing of metal-ceramic functionally graded materials: the conventional control method cannot form a stable conductive film when processing the ceramic layer due to the fixed processing parameters in the process of processing the hole. Successfully process through-holes on metal-ceramic functionally graded materials. Using the step-by-step adaptive fuzzy control strategy, the optimal combination of parameters can be carried out according to the characteristics of different material layers. When the gradient layer and ceramic layer with high ceramic composition content are processed, a stable conductive film can be for...

Embodiment

[0046]

[0047] The workpiece is connected to the positive pole of the power supply, and the tool electrode is connected to the negative pole of the power supply. The workpiece, tool electrode and power supply form a discharge circuit during processing. Under the same initial processing conditions, the conventional EDM control method and the step-by-step adaptive fuzzy control method were used to carry out machining comparison experiments. From Figure 6 It can be clearly seen from the discharge waveform diagram that the conventional EDM control system in Ni-Al 2 o 3 In the processing of functionally graded materials, only relying on the simple average voltage method for servo control, there will be a large number of abnormal discharge waveforms in the processing waveform (such as Figure 6 As shown in a), the abnormal discharge state will directly affect the stability and processing efficiency of EDM. The use of step-by-step adaptive fuzzy control will improve the abnor...

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Abstract

The invention discloses a step-by-step self-adaptive fuzzy control method for electrical discharge machining of metal-ceramic functionally graded materials, which belongs to the technical field of electrical discharge machining. To solve metal-ceramic functionally graded materials, due to the different components and structural characteristics of each layer, it is difficult to use EDM to process through-holes on metal-ceramic functionally graded materials and there are residuals between different gradient layers due to energy mismatch. The phenomenon of stress, a problem that affects the performance and life of metal-ceramic functionally graded material parts. Utilizing the structural characteristics of metal-ceramic functionally graded materials and their EDM discharge state characteristics, and according to the change of EDM discharge state of each layer of functionally graded materials as the excitation source, combined with fuzzy control theory to establish the electric discharge state of metal-ceramic functionally graded materials. The fuzzy controller model of spark processing realizes the real-time feedback control of the processing process, and performs energy matching step by step adaptively according to the different processing materials. Process control for metal-ceramic functionally graded materials.

Description

technical field [0001] The invention relates to a control strategy for electric discharge machining of metal-ceramic functionally graded materials, and belongs to the technical field of electric discharge machining. Background technique [0002] In 1987, Japanese scientists Masaoyuki Shinno, Toshio Hirai and Ryuzo Watanabe first proposed the novel idea of ​​gradient combination of metal and super heat-resistant ceramics, and then functionally graded materials quickly became a research hotspot in the field of materials science, among which metal-ceramic functional gradient The research and demand of materials is the most extensive and urgent, and its processing is also extremely difficult. Metal-ceramic functionally graded materials are composed of two phases of metal and ceramics, one side is pure ceramics, and the other side is pure metals, and the material composition ratio and physical properties change gradually along the thickness direction. Due to the novelty of the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H1/02B23H7/20
Inventor 王振龙董树亮耿雪松王玉魁迟关心
Owner HARBIN INST OF TECH
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