Method for electrochemically machining titanium alloy large-scale blades

A processing method and large-size technology, applied in the field of electrolytic machining of large-size titanium alloy blades, to achieve the effects of mature technology, shortened process, and small pressure loss

Active Publication Date: 2010-05-12
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above technical problems, the present invention provides a method for electrolytic machining of titanium alloy large-siz...

Method used

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  • Method for electrochemically machining titanium alloy large-scale blades
  • Method for electrochemically machining titanium alloy large-scale blades
  • Method for electrochemically machining titanium alloy large-scale blades

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare a compressor rotor blade, the material is TC4, the electrolytic processing area is 960cm 2 .

[0039] The structure of the blade blank is as figure 2 As shown, it includes the airfoil part, the mortise 3 and the boss 2, the two sides of the airfoil part are the blade back 1 and the blade basin respectively, the two sides are the air inlet edge 5 and the exhaust edge 6 respectively, and the top is provided with The round table 4 has a center hole 7 processed on the round table 4, which is the 60°A-type center hole described in GB145-85, and the size is as follows Figure 6 As shown. Boss 2 is a cube with the same width and length as the bottom surface of tenon 3, and the same length as the bottom surface of tenon 3, with a height of 40mm; the top surface of boss 2 is connected with tenon 3, and the The opposite bottom surface is the conductive surface; the side of the boss 2 on the same side as the blade back 1 is the blade back side, the side on the same side...

Embodiment 2

[0046] The blade material is TC6, and the electrolytic processing area is 880cm 2 .

[0047] The structure of the blade blank is the same as that of Embodiment 1, except that the height of the boss is 30mm.

[0048] The material of the blade basin electrode and the blade back electrode is 1Cr18Ni9Ti, the cathode width is 2.5mm larger than the blade blank width, the dimensional accuracy grade is IT8, and the working surface roughness value is Ra 0.8μm.

[0049] The machine tool used is the same as in Example 1, and the installation method of the blade blank in the working box is the same as in Example 1, the difference is that the pressing force of the tip is 3500N, and the width of the electrolyte inlet is 3 times the thickness of the blade.

[0050] The electrolytic machining method is the same as in Example 1, the difference is that the machining parameters are: initial gap 0.9mm, electrode feed speed 0.3mm / min, delay time before machining 4s, delay time after machining 4s,...

Embodiment 3

[0053] The blade material is TC11, and the electrolytic processing area is 770cm 2 .

[0054] The structure of the blade blank is the same as that of Embodiment 1, except that the height of the boss is 20 mm.

[0055] The material of the blade pot electrode and the blade back electrode is 1Cr18Ni9Ti, the cathode width is 2.5 mm larger than the blade blank width, the dimensional accuracy grade is IT8, and the working surface roughness value is Ra 0.4 μm.

[0056] The machine tool used is the same as that of Embodiment 1, and the installation method of the blade blank in the working box is the same as that of Embodiment 1, except that the pressing force of the tip is 3000N, and the width of the electrolyte inlet is 2.5 times the thickness of the blade.

[0057] The electrolytic machining method is the same as in Example 1, the difference is that the machining parameters are: initial gap 0.8mm, electrode feed speed 0.4mm / min, delay time before machining 5s, delay time after mach...

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Abstract

The invention relates to a method for electrochemically machining titanium alloy large-scale blades, which comprises the following steps of: arranging a convex plate on a blade blank when preparing the blade blank; performing electrochemical machining on the blade blank by using an electrochemical machine, wherein the height of the convex plate is 20 to 40mm; the clamped area of a clamp and the convex plate is not less than 98 percent of the overall area of the side of the blade; pressing force at the tip is 3,000 to 4,000N; and the width of an inlet of an electrolyte is 2 to 3 times of the thickness of the blade; and symmetrically arranging the inlet of the electrolyte along an inlet edge of the blade blank, wherein machining parameters include the electrode feeding speed of 0.25 to 0.4 mm/min, before-machining time delay of 3 to 5s, after-machining time delay of 3 to 5s, electrolyte temperature of 35-45 DEG C, the hydraulic pressure of the electrolyte of 0.3 to 0.5MPa, and compressed air pressure of 0.4 to 0.6MPa. The method can be used for machining the titanium alloy blade with the blade profile area of more than 700cm2; and the technique can be widely applied to the machining of the profile area of the titanium alloy blade, such as heavy duty gas turbines, a large-scale aero-engines and the like, and also has an extensive application prospect.

Description

technical field [0001] The invention relates to a processing method for titanium alloy blades, in particular to an electrolytic processing method for large-size titanium alloy blades. Background technique [0002] Electrolytic machining is also called electrochemical machining, and its English name is electro-chemical machining, abbreviated as ECM. It is a method of processing by using the electrochemical anodic dissolution of metal workpieces in the electrolyte. In the process of electrolytic machining, with the help of the formed tool cathode, the metal on the anode of the workpiece to be processed is dissolved at a high speed according to the shape of the tool cathode, and as the tool cathode is fed to the workpiece, a small processing gap is maintained, so that the workpiece is processed continuously. Dissolve at a high speed until the surface of the workpiece reaches the required processing shape and size. [0003] Titanium alloy materials are light in weight (about 5...

Claims

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Application Information

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IPC IPC(8): B23H9/10
Inventor 徐斌白英纯盛文娟王德新
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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