Electrolytic polishing process

An electrolytic polishing and process technology, which is applied in the field of electrolytic polishing process and polishing process, can solve the problems that pressure vessel standards and specifications cannot fully meet the requirements of process conditions, and achieve the effect of short polishing time and high production efficiency

Active Publication Date: 2011-02-09
BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We found that since this type of equipment is a pressure vessel, it must be manufactured by a company with pressure vessel manufacturing qualifications, and the standards and specifications of the pressure vessel cannot fully meet the process conditions of the equipment.
Some special technical requirements of the equipment, the manufacturing technology in the domestic market is difficult to meet the following technical weaknesses compared with imported equipment: 1. The production of heat exchange tubes with an inner surface finish of Ra0.1, 2. The inner hole Production of flower plate distributor with smoothness Ra0.1, 3. Production of tube plate with flatness of 1mm after welding without dead angle, 4. Production of cylinder with roundness of 2mm, 5. Assembly of heat exchanger section with special structure, 6. Composite polishing of equipment surfaces, especially heat exchange tubes and distributors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1. The surface roughness of the plate can reach about Ra=0.05 μm and electrolytic polishing.

[0065]Generally, the precision achieved for electrolytic polishing is around Ra0.1. According to the characteristics of electrolytic polishing, in order to achieve the surface finish of Ra<0.1μm, the steps that can be achieved by combining mechanical polishing and electrolytic polishing are as follows: first use conventional methods to obtain an electrolytic polished surface with Ra=0.1μm or so; Then use mechanical polishing or grinding to obtain a surface of Ra=0.03μm, and finally use electrolysis to obtain an electropolished surface with a roughness of about Ra=0.05μm within the specified time range.

Embodiment 2

[0066] Embodiment 2, compound polishing of heat exchange tube

[0067] Composite polishing of heat exchange tubes: The mechanical polishing of the inner surface of heat exchange tubes that can be achieved in the market (diameter <60mm, length greater than 1500mm) can only reach about Ra0.6. Because the polishing method currently on the market is difficult to use force during polishing, it is almost difficult to pass the sampling inspection of broken pipes in the middle of the pipe. For this reason, this equipment adopts special tooling to fine-polish the purchased (rolled surface reaches about Ra0.4) stainless steel cold-rolled and fine-rolled bright tubes to about Ra0.2. Then electrolytic polishing is used to electrolyze the heat exchange tube of Ra0.3 to about Ra0.1.

Embodiment 3

[0068] Example 3. Composite polishing of flower plate holes

[0069] Composite polishing of flower plate holes: Since the diameter of the holes is only 9mm and the number is very large. Therefore, electrolytic polishing is used to electrolyze the inner surface of the finely reamed flower plate hole Ra0.4 to about Ra0.1. In the second step, the holes with serious surface machining traces are mechanically polished and ground with a custom-made nylon polishing head containing quartz. The third step is to mechanically polish the surface and outer circle of the flower plate to about Ra0.3. Finally, the overall electrolytic polishing is carried out. Note: Sometimes it is necessary to repeat between the first step and the second step until the inner hole finish reaches 0.1.

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PUM

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Abstract

The invention relates to an electrolytic polishing process. The electrolytic polishing process of the invention comprises the following steps of: removing oil from a workpiece; washing with water; soaking in acid; performing electrolytic polishing; performing countercurrent rinsing for three times; soaking in alkali; washing with water; passivating; wiping or drying; and packaging.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a polishing process, in particular to an electrolytic polishing process. Background technique [0002] At present, the PA6 new high-capacity and high-quality continuous final polymerization kettles used in China are mainly imported from abroad due to domestic manufacturing processes, and imported equipment occupies most of the domestic market. In order to ensure that the produced equipment can meet the requirements of the process, after years of market research and research and development of the production process. We found that since this type of equipment is a pressure vessel, it must be manufactured by a company with pressure vessel manufacturing qualifications, and the standards and specifications of the pressure vessel cannot fully meet the process conditions of the equipment. Some special technical requirements of the equipment, the manufacturing technology in the domestic m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/24
Inventor 冯常龙董建忠
Owner BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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