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Electric spark machining method and device for micro inverted taper hole

A processing method and a technology for a reverse taper hole, which are applied in the field of electric discharge machining methods and processing devices, and can solve the problems of helpless taper, discharge energy reducing the feed speed, and small taper of the reverse taper hole.

Inactive Publication Date: 2012-10-03
WUXI MICRO RES PRECISE MACHINERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method trims the sharpened tool electrode in the middle of processing to ensure the processing range of the end of the tool electrode, but also, after the hole is processed through and the smaller taper is processed, the processed product has been processed. The medium in the machining gap is a uniform working fluid, and the closest point between the poles is no longer near the exit. Increasing the discharge energy and reducing the feed rate will not help the expansion of the taper, so this method can The taper of the machined reverse taper hole is also small

Method used

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  • Electric spark machining method and device for micro inverted taper hole
  • Electric spark machining method and device for micro inverted taper hole

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Before the hole is machined through, the machining energy is not adjusted, and an inverted taper hole with a relatively small taper can be machined.

[0040] Such as figure 2 As shown in a to 2d, this embodiment includes the following steps:

[0041] 1) Turn on the processing power supply 6 and use the tool electrode 1 to process the workpiece 4. When the control system 5 judges that the hole has not been processed through, the processing energy of the processing power supply 6 remains unchanged. The control system 5 controls the electrode feeding system 8 according to the inter-electrode discharge state fed back by the detection system 7, and adjusts the gap between the tool electrode 1 and the workpiece 4 to achieve a good discharge state.

[0042] 2) When the control system 5 judges that the hole has been machined through, the control system 5 controls the electrode feed system 8 to make the tool electrode 1 feed rapidly, and at the same time increases t...

Embodiment 2

[0044] Embodiment 2: Before the hole is machined through, the discharge energy is gradually increased, and an inverted taper hole with a larger taper than that of Embodiment 1 can be processed.

[0045] Such as figure 2 As shown in a to 2d, this embodiment includes the following steps:

[0046] 1) Turn on the processing power supply 6, and use the tool electrode 1 to process the hole on the workpiece 4. When the control system 5 judges that the hole has not been processed through, the processing voltage of the processing power supply 6 increases gradually with the increase of the feed depth of the tool electrode 1. , at about the rear 1 / 3 of the feed depth of the tool electrode 1 before the hole is penetrated, the voltage is increased by 30% compared with the first 2 / 3. The control system 5 controls the electrode feeding system 8 according to the inter-electrode discharge state fed back by the detection system 7, and adjusts the gap between the tool electrode 1 and the workp...

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Abstract

The invention provides an electric spark machining method and device for a micro inverted taper hole. The method comprises the following steps of: using a tool electrode as a cathode and a workpiece as an anode; before a hole is penetrated by machining, detecting a discharging state between the cathode and the anode in real time; automatically adjusting feeding speed of the tool electrode; adjusting the cathode and the anode to a proper clearance and discharging state and adjusting discharging energy of a machining power supply in real time according to needs in the process; at the moment when the hole is penetrated by machining, suddenly changing the discharging state between the cathode and the anode; monitoring the sudden change in real time; judging that the hole has been through; rapidly feeding the electrode at the moment; increasing the discharging energy of the machining power supply for machining; and cutting off the power supply to stop machining when the electrode feeding depth reaches a preset value. According to the invention, a conductive medium effect of a machined product is effectively utilized near a machining outlet, the machining range of the electrode at the outlet is enlarged, the outlet diameter of the machined inverted taper hole is much more than the inlet diameter of the inverted taper hole, and the taper of the machined inverted taper hole is larger.

Description

technical field [0001] The invention belongs to the technical field of special micromachining, and relates to an electric discharge machining method and a machining device for a tiny reverse taper hole. Background technique [0002] A large number of theoretical and experimental studies have shown that the nozzle hole of the fuel injector adopts an inverted cone shape (that is, the inner diameter of the nozzle hole is larger than the outer diameter), which helps to improve the flow coefficient and atomization effect of the nozzle hole. Inverted tapered nozzle holes have been widely used in diesel engines. With the increasing standards for motor vehicle exhaust emissions in various countries, the diameter of the nozzle hole has been reduced to less than 200 μm. How to process such a small inverted tapered hole is still a problem. Technical Difficulties. [0003] EDM is to generate a pulsed spark discharge between the tool electrode and the workpiece, and use the local instan...

Claims

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Application Information

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IPC IPC(8): B23H1/00B23H9/14
Inventor 李勇胡瑞钦虞锋
Owner WUXI MICRO RES PRECISE MACHINERY TECH CO LTD
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