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Electrolyte-plasma polishing technique for stainless steel precise structural part

A technology of precision structural parts and process methods, applied in the field of precision machining, can solve the problems of deep long holes, intersecting holes, many blind holes, difficult to completely remove tiny burrs, complex internal structure, etc.

Inactive Publication Date: 2016-01-06
北京实验工厂有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are widely used high-pressure water jet deburring, thermal energy deburring, abrasive flow deburring, jet grinding deburring, rotating abrasive deburring, etc. The above methods have a good effect on removing tiny burrs and blunt edges on the surface of parts. However, for precision cavity parts with complex structures, the burrs in the internal deep long holes and intersecting holes are not effective, and the tiny burrs cannot be completely removed.
[0003] The design and production of the servo valve, the core component of the aerospace servo mechanism, has the characteristics of high dimensional accuracy (micron level) and complex internal structure. There are many deep and long holes, cross holes, and blind holes inside the parts. It is difficult to completely remove the parts through the above methods. tiny glitches after

Method used

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  • Electrolyte-plasma polishing technique for stainless steel precise structural part
  • Electrolyte-plasma polishing technique for stainless steel precise structural part
  • Electrolyte-plasma polishing technique for stainless steel precise structural part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Taking the shell of the servo valve, the core component of the aerospace servo mechanism, as an example, the general process of existing processing is: heat treatment (quenching and tempering) → milling (shape processing) → heat treatment (quenching) → honing (semi-finishing hole) → flat grinding ( Finishing parts shape)→finishing (finishing holes)→cleaning (removing dirt)→general inspection.

[0034] The overall processing flow after adding the polishing process of the present invention is: heat treatment (quenching and tempering) → milling (shape processing) → heat treatment (quenching) → honing (semi-finishing hole, reserve a process allowance of 0.01 to 0.03 mm for electrolyte-plasma polishing )→Plain grinding (finishing the shape of the part, reserve a process allowance of 0.01~0.03mm for electrolyte-plasma polishing)→electrolyte-plasma polishing (application of special polishing process parameters, with special lifting fixture for parts, to remove tiny burrs in int...

Embodiment 2

[0038] Taking the valve sleeve of the servo valve, the core component of the aerospace servo mechanism, as an example, the schematic diagram installed on the tooling is as follows: image 3 As shown, the structure 7 (valve sleeve) to be polished is installed on the back-shaped block 8 through screws 9 to ensure that the clamping surface is in close contact with the surface of the structural part, and the back-shaped block 8 is installed on the lower end of the steel sheet 2 through bolts 6 on the mounting hole.

[0039] For valve sleeve parts, the technical state before electrolyte-plasma polishing is: 0.01mm process allowance is left between the outer circle and the main hole, the cylindricity of the main hole is <0.005mm, the cylindricity of the outer circle is less than 0.005mm, and the polishing process parameters The concentration of polishing solution is 2%; the polishing temperature is 85°C; the polishing time is 4 minutes. After polishing, the actual measurement: the s...

Embodiment 3

[0041] Taking the spool of the servo valve, the core component of the aerospace servo mechanism, as an example, the schematic diagram installed on the tooling is as follows: Figure 4 As shown, the structure 7 (spool) to be polished is placed in the V-shaped groove of the V-shaped block 11, and the pressure plate 10 is placed on the outer surface, and the pressure plate 10 and the V-shaped block 11 are fixed on the lower end of the steel sheet 2 by screws 9.

[0042] For valve core parts, the technical status before electrolyte-plasma polishing is: 0.01mm process margin is left on the outer circle, the cylindricity of the outer circle is <0.005mm, and the polishing process parameters are: polishing solution concentration 2%; polishing temperature 80 ℃; the polishing time is 5 minutes, and the actual measurement after polishing: the outer contour of the part is evenly blunted R≈0.1, and the tiny burrs on the outer surface are completely removed.

[0043]After measuring the part...

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Abstract

The invention discloses an electrolyte-plasma polishing technique for a stainless steel precise structural part. The electrolyte-plasma polishing technique for the stainless steel precise structural part comprises the following steps that (1) 0.01-0.03 mm technological allowance is set before the stainless steel precise structural part is polished; (2) the stainless steel precise structural part is installed on a special polishing tool, the tool comprises an insertion plate and steel sheets, a plurality of sliding grooves are formed in the insertion plate, one steel sheet is installed in each sliding groove, the steel sheets can slide horizontally along the sliding grooves, the structural part to be polished is fixedly arranged at the lower ends of the steel sheets, the clamping surface of the tool makes close contact with the surface of the structural part, and ablation of the surface of the part caused by abnormal discharging is prevented; (3) ammonium sulfate polishing liquid with the concentration being 2%-4% is added into an electrolytic bath, and the temperature of the polishing liquid is controlled between 80 DEG C and 95 DEG C; and (4) the structural part which is clamped through the tool in the step (2) is placed in the polishing liquid in the step (3), and polishing is conducted through direct currents for 2-10 min.

Description

technical field [0001] The invention belongs to the technical field of precision machining, and can realize the removal of tiny burrs of stainless steel precision structural parts after precision machining, reverse the sharp edges on the surface of blunt parts, and improve the surface quality of the parts. Background technique [0002] In the field of precision and ultra-precision machining technology, how to effectively and completely remove the tiny burrs generated during machining after parts machining has always been one of the technical difficulties in this field. At present, there are widely used high-pressure water jet deburring, thermal energy deburring, abrasive flow deburring, jet grinding deburring, rotating abrasive deburring, etc. The above methods have a good effect on removing tiny burrs and blunt edges on the surface of parts. However, for precision cavity parts with complex structures, the burrs in the internal deep long holes and intersecting holes are gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/24
Inventor 丁忠军丁宇亭杨增辉赵建斌
Owner 北京实验工厂有限责任公司
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