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Electropolishing method for austenitic stainless steel orifice

A technology of austenitic stainless steel and electrolytic polishing, which is applied in the direction of electrolytic process and electrolytic components, and can solve problems such as excessive voltage and current, difficulty in achieving heat and burns, and poor fluidity of the solution.

Active Publication Date: 2010-11-24
BEIJING SEVENSTAR ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the actual industrial production at present, for the polishing of stainless steel small holes and deep blind holes with relatively small apertures (aperture ≥ 1mm) and relatively large depth-to-diameter ratios (≥ 10mm), the traditional process formula is mainly based on phosphoric acid. And supplemented with other additives, the current density is usually 70-120A / dm 2 , or the voltage is 7-15V, or even as high as 30V, the viscosity of the solution is relatively large, and the voltage and current are too large. It is generally considered that the solution fluidity is not good or the heat burns during small-hole electropolishing, which cannot be realized or is quite difficult to achieve, etc. The reason is that in actual production, traditional methods such as machinery and physics are still in the majority, and the effect is not very ideal.

Method used

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  • Electropolishing method for austenitic stainless steel orifice
  • Electropolishing method for austenitic stainless steel orifice
  • Electropolishing method for austenitic stainless steel orifice

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The polishing solution used in this embodiment is as follows: every liter of the mixed solution contains 1100 g of phosphoric acid with a concentration of 85%; 240 g of sulfuric acid with a concentration of 95%; and 210 g of absolute ethanol with a concentration of 99.5%. The voltage is 4V; the current density is 10A / dm 2 .

[0029] figure 1 It is a schematic diagram of the electrolytic polishing process for small through-holes of stainless steel according to an embodiment of the present invention. During electropolishing, the workpiece 1 is first passed through the electrode needle 2 and fixed on the clamping device 3, so that the workpiece 1, the clamping device 3 and the tube 5 jointly form a solution circulation channel, and then the whole is immersed in the polishing solution 4 ( Solution temperature: 50-65°C), tube 5 is connected to solution circulation equipment (peristaltic pump or electromagnetic metering pump, etc.) The anode (the positive pole of the power...

Embodiment 2

[0031] The polishing solution used in this embodiment is: every liter of mixed solution contains 1000g of phosphoric acid with a concentration of 85%; 200g of sulfuric acid with a concentration of 95%; 180g of dehydrated alcohol with a concentration of 99.5%, and 6.5ml glycolic acid solution with a concentration of 35% %. The voltage is 4.2V; the current density is 15A / dm 2 .

[0032] figure 1 It is a schematic diagram of the electrolytic polishing process for small through-holes of stainless steel according to another embodiment of the present invention. During electropolishing, the workpiece 1 is first passed through the electrode needle 2 and fixed on the clamping device 3, so that the workpiece 1, the clamping device 3 and the tube 5 jointly form a solution circulation channel, and then the whole is immersed in the polishing solution 4 ( Solution temperature: 50-65°C), tube 5 is connected to solution circulation equipment (peristaltic pump or electromagnetic metering pu...

Embodiment 3

[0034] The polishing solution used in this embodiment is: every liter of mixed solution contains 1250g of phosphoric acid with a concentration of 85%, 260g of sulfuric acid with a concentration of 95%; 240g of absolute ethanol with a concentration of 99.5%; the voltage is 2.5V; the current density is 3.5 A / dm 2 .

[0035] figure 2 It is a schematic diagram of the electrolytic polishing process of stainless steel deep blind holes according to another embodiment of the present invention. Its basic principle is the same as above, and the main difference is that the electrode needle 2 is a small tube electrode, which is fixed by a clamping device. The connection acts as a cathode for conducting electricity, and on the other hand, it is also connected with the tube 5 to form a solution circulation channel to transport the solution. The solution circulation is to transport the solution to the bottom of the small hole through the tube electrode, and then flow out from the bottom t...

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Abstract

The invention discloses a polishing solution for electropolishing an austenitic stainless steel orifice. Each litre of electropolishing polishing solution contains 1000 to 1250g phosphoric acid, 200 to 260g sulfuric acid and 180 to 240g absolute ethyl alcohol. The electropolishing of the austenitic stainless steel orifice is well realized by reasonably designing the electropolishing solution and electropolishing technological parameters. The electropolishing of stainless steel orifices, deep blind holes and cross holes with relatively small aperture of more than or equal to 1mm and relatively large ratio of depth to diameter of more than or equal to 10mm is realized, The polishing effect of the invention is obviously better than that of the traditional mechanical or physical method and can be as high as the polishing effect of a mirror surface according to the surface condition of the unpolished orifice.

Description

technical field [0001] The invention relates to a method for electrolytic polishing of small holes in austenitic stainless steel, especially small stainless steel holes, deep blind holes and cross holes with relatively small diameter (diameter ≥ 1mm) and relatively large depth-to-diameter ratio (≥ 10mm). Electropolishing method. Background technique [0002] At present, there are many known electrolytic polishing methods for stainless steel, but there are two kinds of electrolytic polishing parts: one is the electrolytic polishing of the outer surface, and its main purpose is to look good or change its surface quality. Mature, the process formula and parameters are relatively broad, and the operation control is relatively easy and convenient. This is also the most commonly used and relatively traditional type of process method; the other is the electrolytic polishing of the inner surface of the tubular body or cavity, which is relatively external. The surface method is much...

Claims

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Application Information

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IPC IPC(8): C25F3/24C25F7/00
Inventor 方刚祝恒阳张猛
Owner BEIJING SEVENSTAR ELECTRONICS CO LTD
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