Method for electrolytically machining complex case type surface

A complex, electrolytic solution technology, applied in the direction of electrochemical processing equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of large impact on the service life of machine tools, large residual stress on the surface of materials, and difficult cutting of materials, so as to avoid processing costs High efficiency, high electrode utilization, and simplified processing

Active Publication Date: 2010-06-16
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This technology is not only applicable to the production of military aircraft, but also to the manufacture of large civil aircraft, especially the case casing made of high temperature heat-resistant alloy material. If it is formed by multi-axis CNC milling and milling, a large amou...

Method used

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  • Method for electrolytically machining complex case type surface
  • Method for electrolytically machining complex case type surface
  • Method for electrolytically machining complex case type surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The structure of the ring forging blank is as follows: Figure 12 shown. The material of the ring-shaped forging blank is GH907, the heat treatment HB≥285, the weight is 90kg, the shape is a ring-shaped surface, turned and formed, the diameter is 572mm, and the surface roughness is Ra6.3μm.

[0045] The structure of casing parts is as follows: Figure 13 As shown, there are 2 annular flanges 15, 1 short longitudinal flange 16, and 2 longitudinal flanges 17 distributed symmetrically with the casing parts axis on the outer surface. The depth of electrolytic machining is 15mm, and the surface roughness value is Ra1.6μm.

[0046] For the indexing and division of the casing profile, see Figure 14 , 15 , Shown in 16, the selected electrode corresponds to the block. The outer surface of the casing is divided into upper and lower parts for processing, see K-K section, the upper part of the workpiece is divided into 10 pieces with equal angles, processed with 1# electrode,...

Embodiment 2

[0058] The structure of the circular forging blank is the same as in Example 1.

[0059] The structure of casing parts is the same as in Embodiment 1.

[0060] The indexing, dividing, grouping and sub-operations of casing profile processing are the same as in embodiment 1.

[0061] The fixing method and positioning method of the forging blank on the fixture are the same as in Embodiment 1.

[0062] The difference is: the 1# electrode has a horizontal curve increasing fluid outlet. The width of the water outlet is b1=2mm, the depth d=15mm, rounded along the periphery of the water outlet, the radius of rounding is r=0.5mm, and the surface roughness Ra is 0.8μm. The diameter of the circular holes at both ends is Φ3mm, and the transitional arc R between the circular hole and the long side is 30mm. The size increase of the front end working surface of the electrode is Δ1=0.3mm. The size reduction of the electrode side working surface is Δ2=0.5mm, and the inclination angle β=5°....

Embodiment 3

[0065] Blank structure such as Figure 17 shown. The blank material is GH706 nickel-based superalloy, heat treatment HB≥285, and the blank weighs about 85kg. The diameter of the large end circle of the cone is Φ720mm, the height is 158mm, and the taper is 10°. Turning processing molding, surface roughness value Ra3.2μm.

[0066] The structure of casing parts is as follows: Figure 18 shown. There are two large square bosses with the same shape and one small square boss on the outer ring profile, which are distributed at different angles along the circumference. Two longitudinal flanges are symmetrically distributed, and there are 1 annular flange at the upper and lower ends. place. The depth of electrolytic machining is 15mm, and the surface roughness value is Ra1.6μm.

[0067] For the indexing and division of the casing surface, see Figure 19 shown. The outer surface of the casing is divided into 16 pieces, and the selected electrodes correspond to the pieces. The 5...

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Abstract

The invention relates to a method for electrolytically machining a complex case type surface, comprising the following steps of: (1) installing a forge piece blank on a jig, setting a dividing disc on the jig, and dividing a ring-shaped forge piece blank machining area according to a minimum machining unit through the dividing disc; (2) determining the position of a block according to the dividing disc and determining an electrode adopted by the position; and (3) electrolytically machining the ring-shaped forge piece blank by an electrolytic machining machine tool, wherein the working parameters of the electrolytic machining is as follows: a machining gap is 0.1-0.8 mm, electrode feed speed is 0.25-1.5 mm/min, machining voltage is 15-20 V, electrolyte is a NaCl water solution with the mass concentration of 15-18 percent, the temperature of the electrolyte is 30-40 DEG C, and the hydraulic pressure of the electrolyte is 4.5-1.5 MPa. The method has high electrode utility ratio by machining areas with same geometries with a same electrode, can be used for the manufacture of cases of various large-sized motors and has wide application prospect.

Description

technical field [0001] The invention relates to a machining method for casing profiles, in particular to a method for electrolytically machining complex casing profiles. Background technique [0002] Electrolytic machining (ECM) is a method of forming parts with certain dimensional accuracy and surface roughness by using the principle of electrochemical anodic dissolution of metals in electrolyte. Electrolytic machining technology has been widely used in engine blade processing, mold processing and other fields, but there is no domestic data record about electrolytic machining of large engine casings. [0003] The electrolytic machining technology of the large casing of aero-engine has a wide application prospect, but the research on this technology is still a blank in our country. This technology is not only applicable to the production of military aircraft, but also to the manufacture of large civil aircraft, especially the case casing made of high temperature heat-resist...

Claims

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Application Information

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IPC IPC(8): B23H3/00
Inventor 徐斌朱海南白英纯刘松盛文娟金文媞王德新刘海波
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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