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Electrolytic Machining Method and Device for Micro Inverted Taper Holes

A processing method and technology of inverted taper holes, which are applied in the field of micro special processing, can solve the problems of complex process, large secondary alignment error between tool electrodes and through holes, and unclear quantitative relationship selection method, so as to simplify the processing process, The effect of improving shape accuracy

Active Publication Date: 2017-11-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quantitative relationship between the hole diameter formed by material erosion in ECM and the processing parameters and the selection method of the control law of the processing parameters are still unclear.
[0005] CN201110144408 proposes a method and device for electrolytic machining of micro-inverted taper holes. The process is to drill or EDM a through hole on the workpiece in advance, and then electrolytically process the inverted taper hole on the basis of the through hole. In the electrolytic process The secondary alignment error between the tool electrode and the through hole is relatively large, and the alignment accuracy directly affects the shape accuracy of the fine inverted taper hole, and the process is more complicated due to the need for secondary processing

Method used

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  • Electrolytic Machining Method and Device for Micro Inverted Taper Holes
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  • Electrolytic Machining Method and Device for Micro Inverted Taper Holes

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Embodiment 1

[0057] In this embodiment, the diameter of the outlet is 178 μm, and the taper is 1.15° on the 18CrNi8 with a workpiece thickness of 1.0 mm. h=0~1000 μm). The electrolytic machining method of the micro back taper hole comprises the following steps:

[0058] S1: Install the workpiece 20 to be processed on the fixture 70, electrically connect the workpiece 20 to the positive pole of the pulse power supply 30, and electrically connect the tool electrode 10 to the negative pole of the pulse power supply 30.

[0059] S2: Turn on the liquid pump power supply of the high-pressure internal flushing unit 40 and the low-voltage electrolyte circulation unit 50, so that the high-pressure internal flushing unit 40 provides electrolyte to the machining gap through the inner hole of the tool electrode 10, and set the low-voltage electrolyte circulation unit Electrolyte pressure of 50 p 2 0.05MPa, the electrolyte of the high-pressure internal flushing unit 40 and the low-pressure electrolyt...

Embodiment 2

[0067] The steps of the electrolytic machining method of this embodiment are basically the same as the steps of Embodiment 1, the difference between the two is only step S4, and step S4 of this embodiment includes the following steps:

[0068] S4: During the downward feeding process of the tool electrode 10, the electrolytic machining voltage of the tool electrode 10 is U=11V, the pulse duty ratio λ=0.5, and the feed speed is according to v f =4.6-0.0024h The control law is changed, the liquid supply pressure p of the high-pressure internal flushing unit 40 1 according to p 1 =5.2×10 5 +204h+0.12h 2 changes in the control law.

[0069] Among them, the unit of the pulse duty cycle is 1, and the feed rate v f The unit of h is μm / s, the unit of the liquid supply pressure of the high-pressure internal flushing unit 40 is Pa, h=0˜1000 μm.

[0070] The electrolytic machining method and device of the micro-inverted taper hole proposed by the present invention have the following ...

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Abstract

The invention relates to an electrolytic machining method of a fine inverted cone hole. The fine inverted cone hole of below phi 200 microns is machined as a research target; and on the basis of adopting a fine hollow electrode and a high-pressure liquid supply device, the precise forming of the inverted cone hole is once realized. Along with downward feeding of a tool electrode, one or more in electrolytic machining voltage U, a pulse duty ratio gamma and a tool electrode feeding speed vf are controlled to change along with a machining depth according to a machining parameter cooperative control relation of the fine inverted cone hole. The machining parameter cooperative control relation is obtained by an aperture-parameter relation of d=83.59+182.06*gamma-17.06*gamma*vf+0.35*U2 of the fine inverted cone hole and a shape parameter of d=a0.h+d0 of the inverted cone hole; a0 is determined by a taper angle of the fine inverted cone hole; d0 is an inlet diameter of the inverted cone hole; a workpiece performs the outlet fillet machining after being cut through; and finally, the tool electrode is upwards returned to an initial position to obtain the fine inverted cone hole.

Description

technical field [0001] The invention relates to an electrolytic machining method and device for a micro-inverted taper hole, and belongs to the technical field of micro-special machining. Background technique [0002] Under the trend of miniaturization and precision of the structure of mechanical parts, the application of fine inverted taper holes with high aspect ratio in the fields of engines, micro-electromechanical systems and precision instruments is increasing. For example, the fine inverted tapered nozzle holes on the fuel injectors of diesel engines can effectively improve the combustion efficiency of fuel and reduce exhaust emissions. Moreover, processing rounded corners at the inlet of the fuel injection can further improve the flow coefficient of the fuel. With the improvement of the size, shape and accuracy requirements of the back taper hole, the difficulty of precision forming and surface finishing of the micro back taper hole is gradually increasing. How to r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23H9/16
CPCB23H9/16
Inventor 李勇刘国栋孔全存佟浩李朝将
Owner TSINGHUA UNIV