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Electrical discharge machining level-by-level self-adaptive fuzzy control method of metal-ceramic functionally graded material

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

Active Publication Date: 2014-09-10
HARBIN INST OF TECH
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  • Abstract
  • Description
  • 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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  • Electrical discharge machining level-by-level self-adaptive fuzzy control method of metal-ceramic functionally graded material
  • Electrical discharge machining level-by-level self-adaptive fuzzy control method of metal-ceramic functionally graded material
  • Electrical discharge machining level-by-level self-adaptive fuzzy control method of metal-ceramic functionally graded material

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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 Image 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 Image 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 abnorma...

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Abstract

The invention provides an electrical discharge machining level-by-level self-adaptive fuzzy control method of a metal-ceramic functionally graded material, and belongs to the technical field of electrical discharge machining. The method aims to solve the problem that due to differences in components on all layers and structural characteristics of the metal-ceramic functionally graded material, through holes can hardly be machined in the metal-ceramic functionally graded material through the electrical sparks, and the problem that due to mismatching of energy inside the through holes, residual stress exists between different gradient layers, performance and the service life of parts made of the metal-ceramic functionally graded material are affected. By means of the structural characteristics of the material and the electrical discharge machining discharge state characteristics of the material, with changes of the electrical discharge machining discharge state on all layers of material of the functionally graded material serving as an excitation source, an electrical discharge machining fuzzy controller model of the metal-ceramic functionally graded material is established through combination with the fuzzy control theory, the real-time feedback control of the machining process is achieved, and energy matching is conducted level by level in a self-adaptive mode according to the differences of the machined material. The method is used for the machining control over the metal-ceramic functionally graded material.

Description

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

Claims

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Application Information

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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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