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Spiral bevel gear size silvering method

A technology of spiral bevel gears and dimensions, which is applied in the direction of cells, electrolytic processes, electrolytic components, etc., can solve problems such as non-conforming silver layers and falling off of silver layers, and achieve mature process methods, stable product quality, and reasonable and accurate process parameters. Effect

Inactive Publication Date: 2013-03-13
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general silver plating solution still uses cyanide. The cyanide silver plating bath has the advantages of good stability, easy maintenance, and strong dispersion ability of the plating solution. The thickness of the silver layer of the parts is generally controlled between 5-8μm, but for those with For gear parts with strict assembly requirements, the thickness control of the silver layer is not allowed to cause the silver layer to fall off after the test run assessment, which does not meet the inspection standard requirements for the silver layer to be intact and not fall off after the test run assessment

Method used

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  • Spiral bevel gear size silvering method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The spiral bevel gear made of 40CrNiMoA is silver-plated, and the clamping schematic diagram during the silver-plating process of the spiral bevel gear is as follows figure 1 As shown, the polyvinyl chloride protective sleeve is used to protect the parts that do not need to be silver-plated, so that the silver-plated parts are immersed in the silver-plating bath.

[0021] A method of silver-plating the size of a spiral bevel gear is carried out according to the following steps:

[0022] (1) Degreasing, using lye to degrease the spiral bevel gear parts, the composition of lye is: NaOH 40g / l, NaOH 3 PO 4 .12H 2 O 30 g / l, Na 2 SiO 3 10,Na 2 CO 3 50 g / l, the temperature of the bath solution is 60°C, the time is 20 minutes, then rinse with hot water, and rinse with cold water;

[0023] (2) Weak corrosion. Weakly corrode the parts after degreasing with rhodinic hydrochloride solution, pure HCL100g / l in rhodinic hydrochloric acid solution; rhodinic acid 2 g / l, bath te...

Embodiment 2

[0030] The spiral bevel gear made of 40CrNiMoA is silver-plated, and the clamping schematic diagram during the silver-plating process of the spiral bevel gear is as follows figure 1 As shown, the polyvinyl chloride protective sleeve is used to protect the parts that do not need to be silver-plated, so that the silver-plated parts are immersed in the silver-plating bath.

[0031] A method of silver-plating the size of a spiral bevel gear is carried out according to the following steps:

[0032] (1) Degreasing, using lye to degrease the spiral bevel gear parts, the composition of lye is: NaOH 75g / l, NaOH 3 PO 4 .12H 2O 20g / l, Na 2 SiO 3 3g / l, Na 2 CO 3 100 g / l, the temperature of the bath solution is 70°C, the time is 18 minutes, then rinse with hot water, then rinse with cold water;

[0033] (2) Weak corrosion. Weakly corrode the parts after degreasing with rhodine hydrochloride solution. The pure HCL in the rhodine hydrochloride solution is 120 g / l; rhodine 1.5 g / l, t...

Embodiment 3

[0040] The spiral bevel gear made of 40CrNiMoA is silver-plated, and the clamping schematic diagram during the silver-plating process of the spiral bevel gear is as follows figure 1 As shown, the polyvinyl chloride protective sleeve is used to protect the parts that do not need to be silver-plated, so that the silver-plated parts are immersed in the silver-plating bath.

[0041] A method of silver-plating the size of a spiral bevel gear is carried out according to the following steps:

[0042] (1) Degreasing, using lye to degrease the spiral bevel gear parts, the composition of lye is: NaOH 60g / l, NaOH 3 PO 4 .12H 2 O10 g / l, Na 2 SiO 3 8g / l, Na 2 CO 3 30g / l, bath temperature 80°C, time 15min, then rinse with hot water, then rinse with cold water;

[0043] (2) Weak corrosion. Weakly corrode the parts after degreasing with rhodine hydrochloride solution. The pure HCL in the rhodine hydrochloride solution is 150 g / l; rhodine 1g / l, the bath temperature is room temperature, ...

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Abstract

The invention discloses a spiral bevel gear size silvering method, belonging to the electroplating field. The method comprises the following steps of: (1) oil removing, (2) weak corrosion, (3) copper preplating, (4) silver preplating and (5) silvering, wherein, in the silvering step (5), the constituents of a silvering bath liquid comprise 30-40g / l of AgCl, 110-125g / l of total KCN, 70-85g / l of free KCN and not more than 50g / l of K2CO3, the temperature of the bath liquid is 15-25 DEG C, bidirectional pulse current is used, and the pulse power supply parameters are shown as follows: the frequency of the forward pulse is 1000Hz, the duty cycle of the forward pulse is 20% and the current density of the forward pulse is 0.8A / dm<2>; and the frequency of the negative pulse is 1000Hz, the duty cycle of the negative pulse is 10% and the current density of the negative pulse is 0.2A / dm<2>. The growth speed of the obtained silver layer is 1 micrometer / 3 minutes, and the thickness of the silvering layer is controlled to be in a range of 5-6 micrometers. With the method, the crystal of the silvering layer is fine and uniform, and the thickness of the silvering layer can be accurately controlled to be in the range of 5-6 micrometers.

Description

technical field [0001] The invention belongs to the field of electroplating, in particular to a method for plating silver on the size of a spiral bevel gear. Background technique [0002] The spiral bevel gear, the transmission part of the aero-engine, is silver-plated on the surface of the tooth according to the requirements of the design drawings, so as to reduce the friction during the work process, reduce the wear degree of the parts during work, and at the same time play an anti-sticking role. [0003] The particularity of the silver plating on the surface of the spiral bevel gear tooth of the transmission part of the aero-engine is that the thickness of the silver layer must be accurately controlled between 5-6 μm, that is, the silver layer has good uniformity, so as to meet the inspection standards after the engine test run requirements. The results of multiple test runs show that: if the thickness is less than 5 μm, the silver layer will be severely worn and will no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/00C25D5/18C25D3/46C25D21/12
Inventor 刘莉张春刚李庆春朱立新
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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