A real-time compensation method for electrode loss based on spark discharge rate

An electrode loss and spark discharge technology, applied in electrode manufacturing, circuits, electric machining equipment, etc., can solve the problems of unstable servo feed, low processing efficiency, inaccurate compensation of electrode loss, etc., to overcome the instability of servo feed , Accurate loss compensation, the effect of improving accuracy

Active Publication Date: 2016-11-16
HARBIN INST OF TECH
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Problems solved by technology

[0006] The present invention aims to solve the problems that the inaccurate compensation of electrode loss in the current EDM machining can not meet the processing accuracy requirements and the unstable servo feed leads to low processing efficiency. The present invention provides an electrode loss based on the spark discharge rate real-time compensation method

Method used

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  • A real-time compensation method for electrode loss based on spark discharge rate
  • A real-time compensation method for electrode loss based on spark discharge rate
  • A real-time compensation method for electrode loss based on spark discharge rate

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specific Embodiment approach 1

[0030] Specific implementation mode one: see figure 1 Describe this embodiment, a method for real-time compensation of electrode loss based on spark discharge rate described in this embodiment, the method includes the following steps:

[0031] Step 1: Collect the inter-electrode voltage value in real time, and judge whether the inter-electrode discharge occurs according to the inter-electrode voltage value. When the inter-electrode discharge occurs, the spark discharge rate during the discharge process of EDM milling is statistically obtained:

[0032] w ( t e ) = ∫ 0 t t e d t t ,

[0033] t e is the discharge time within a single pulse; t is the sampling time; w(t e ) is the sp...

Embodiment

[0039] Example: When EDM is used to process high-temperature-resistant alloy turbine disks, since the surface of the turbine disk to be processed is relatively complex, there are many electrode idling strokes, which can show the superiority of the real-time compensation method for electrode loss based on the spark discharge rate. When the electrode moves on the surface of the turbine disk workpiece according to the pre-programmed processing program,

[0040] When the distance between the electrode and the workpiece has not been discharged, there is no electrode loss, and the detected spark discharge rate is zero, such as figure 2 Shown at no load, so no loss compensation will be performed during electrode movement;

[0041] When the electrode and the workpiece are just beginning to contact, the discharge is not continuous at this time, and the detected spark discharge rate is low, and the discharge rate is at figure 2 In the low spark discharge rate area shown, the correspo...

specific Embodiment approach 2

[0045] Specific implementation mode two: see figure 1 Describe this embodiment. The difference between this embodiment and the method for real-time compensation of electrode loss based on the spark discharge rate described in Embodiment 1 is that the conditions for judging whether discharge occurs between electrodes according to the voltage value between electrodes are as follows: The inter-electrode voltage value is between no-load and short-circuit reference voltage values.

[0046] In this embodiment, the electrode loss rate is adjusted in real time according to the spark discharge rate during electric discharge milling, and the electrode loss compensation amount changes with the change of the spark discharge rate.

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Abstract

An electrode loss real-time compensation method based on a spark discharge rate relates to a method for compensating electrode loss in real time in an electric spark milling machining process, solving the problems of an existing electric spark milling machining process that the electrode loss is not accurate so that the machining precision requirement cannot be met and servo feeding is not stable so that the machining efficiency is low. The method comprises the following steps: step 1: collecting a voltage value between electrodes in real time, and judging whether discharge occurs or not according to the voltage value between the electrodes; when the discharge occurs between the electrodes, counting the discharge rate in an electric spark milling discharging process to obtain w(te); step 2: calculating a real-time electrode loss rate eta (te) according to a relation formula of the discharge rate and the electrode loss rate; and step 3: adjusting an electrode loss compensation amount by an electrode movement system according to the electrode loss rate eta (te) calculated by the step 2, so as to realize the aim of adjusting the electrode loss compensation according to the discharge rate between the electrodes. The electrode loss real-time compensation method is mainly used for the field of electric spark machining.

Description

technical field [0001] The invention relates to a method for real-time compensation of electrode loss in electric spark milling. Background technique [0002] A large number of high-strength and high-temperature-resistant materials such as titanium alloys and nickel-based high-temperature-resistant alloys are used in the aerospace industry. The cost of cutting tools is very high when removing large-volume materials from difficult-to-machine materials with traditional processing methods. Electric discharge milling uses numerical control system to control the movement of simple tubular electrodes, and is equipped with high-pressure flushing fluid to realize layered electric discharge milling similar to traditional milling, and its current processing efficiency has reached a level similar to that of mechanical milling , so it has great application space in aerospace field. Since EDM relies on the compound action of heat generated by the discharge between electrodes to remove m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H1/00G06F19/00
CPCB23H1/02B23H1/04G16Z99/00
Inventor 狄士春郭成波
Owner HARBIN INST OF TECH
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