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A method for protecting the inner wall surface of hollow shaft parts with large length-to-diameter ratio

A technology with large length-to-diameter ratio and hollow shaft, which is applied in the field of surface treatment, can solve the problems of difficult electroplating treatment, increase electroplating cost, increase inner hole electrodes, etc., and achieve the effect of omitting electroplating tooling and reducing electroplating cost

Active Publication Date: 2018-06-29
BEIJING SHUGUANG AERO ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, electroplating the inner surface of the inner hole with an aspect ratio greater than 4 is a relatively difficult process problem. The technical standard of navigation mark HB / Z5068-92 stipulates that the inner surface of the through hole with an aspect ratio greater than 4 is allowed to have no coating in the middle.
If there is a protective film in the middle of the inner wall, electrodes must be added to the inner hole during electroplating. This method can only be used on parts with large apertures, and cannot be implemented when the aperture is less than 30mm
At the same time, after adding the inner hole electrode, the structure of the tooling is very complicated, which greatly increases the cost of electroplating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The inner diameter of the hollow shaft is ф15mm, the length of the inner surface is 205mm, and the material is 30CrMnSiA. The surface of the inner diameter of the hollow shaft is blue, and the outer surface is passivated by 5-8 cadmium plating.

[0019] Surface preparation and protection steps are as follows:

[0020] 1. Parts bluing treatment: according to the method stipulated in the navigation mark HB / Z5079-1996, carry out bluing treatment on the hollow shaft parts with large aspect ratio;

[0021] The bath temperature is 145°C and the blue time is 90 minutes

[0022] 2. Water injection: Stand the large aspect ratio hollow shaft parts upright, plug the lower port of the large aspect ratio hollow shaft parts with a plug, inject tap water into the inner cavity of the large aspect ratio hollow shaft parts from the upper port, and then plug the upper port Plug it tightly with a plug to fill the inner cavity of the hollow shaft part with a large aspect ratio with water;...

Embodiment 2

[0027] The inner diameter of the hollow shaft is ф18mm, the length of the inner surface is 215mm, and the material is 30CrMnSiA. The surface of the inner diameter of the hollow shaft is blue, and the outer surface is galvanized with 5-8 passivation.

[0028] Surface preparation and protection steps are as follows:

[0029] 1. Parts bluing treatment: according to the method stipulated in the navigation mark HB / Z5079-1996, carry out bluing treatment on the hollow shaft parts with large aspect ratio;

[0030] The bath temperature is 150°C and the blue time is 60 minutes

[0031] 2. Water injection: Stand the large aspect ratio hollow shaft parts upright, plug the lower port of the large aspect ratio hollow shaft parts with a plug, inject tap water into the inner cavity of the large aspect ratio hollow shaft parts from the upper port, and then plug the upper port Plug it tightly with a plug to fill the inner cavity of the hollow shaft part with a large aspect ratio with water; t...

Embodiment 3

[0036] The inner diameter of the hollow shaft is ф18.5mm, the length of the inner surface is 225mm, and the material is 40CrMnSiA. The surface of the inner diameter of the hollow shaft is blue, and the outer surface is passivated by 5-8 cadmium plating.

[0037] Surface preparation and protection steps are as follows:

[0038] 1. Parts bluing treatment: according to the method stipulated in the navigation mark HB / Z5079-1996, carry out bluing treatment on the hollow shaft parts with large aspect ratio;

[0039] The bath temperature is 148°C and the blue time is 95 minutes

[0040] 2. Water injection: Stand the large aspect ratio hollow shaft parts upright, plug the lower port of the large aspect ratio hollow shaft parts with a plug, inject tap water into the inner cavity of the large aspect ratio hollow shaft parts from the upper port, and then plug the upper port Plug it tightly with a plug to fill the inner cavity of the hollow shaft part with a large aspect ratio with wate...

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PUM

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Abstract

The invention belongs to the surface treatment technology and relates to a surface protection method for a large length-diameter ratio hollow shaft part inner wall. The surface protection method for a hollow shaft inner wall is characterized by comprising the following steps: part bluing treatment; water injection; outer wall bluing removal; electroplating treatment; and leather plug removal. According to the surface protection method for the large length-diameter ratio hollow shaft part inner wall, provided by the invention, the surface of the large length-diameter ratio hollow shaft part inner wall can be effectively protected, complicated electroplating tools are saved, and the electroplating cost is lowered.

Description

technical field [0001] The invention belongs to the surface treatment technology and relates to a method for protecting the inner wall surface of a hollow shaft part with a large length-to-diameter ratio. Background technique [0002] At present, electroplating the inner surface of the inner hole with an aspect ratio greater than 4 is a relatively difficult process problem. The technical standard of navigation mark HB / Z5068-92 stipulates that the inner surface of the through hole with an aspect ratio greater than 4 is allowed to have no coating in the middle. If there is a protective film in the middle of the inner wall, electrodes must be added in the inner hole during electroplating. This method can only be used on parts with large apertures, and cannot be implemented when the aperture is less than 30mm. At the same time, after adding the inner hole electrode, the structure of the tooling is very complicated, which greatly increases the cost of electroplating. Contents o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/02C25D7/04C23C8/10
CPCC23C8/10C25D5/028C25D7/04
Inventor 李忠山
Owner BEIJING SHUGUANG AERO ELECTRICAL