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A local chrome plating method for stainless steel bolts

A stainless steel and bolt technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of increasing production cost, large amount of tape, affecting the strength of stainless steel bolts, etc., and achieves the effect of solving high cost and improving strength

Active Publication Date: 2021-01-26
GUIZHOU AEROSPACE PRECISION PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when chrome-plating stainless steel bolts, tapes are used to wrap parts of the stainless steel bolts that do not require chrome plating. After chrome-plating the stainless steel bolts, the tape needs to be disassembled. And it cannot be used again, which increases the production cost and is not environmentally friendly. At the same time, under the existing chrome plating process, the tip water chestnut of the thread on the stainless steel bolt is exposed, and the current tip effect occurs. The thickness of the coating on the bolt body of the stainless steel bolt near the threaded end rod is thick 10~30 um at the other end, resulting in uneven stress on the stainless steel bolt after chrome plating, seriously affecting the strength of the stainless steel bolt itself

Method used

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  • A local chrome plating method for stainless steel bolts
  • A local chrome plating method for stainless steel bolts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for partial chrome plating of stainless steel bolts of the present invention comprises the following steps.

[0026] Drying: Clean and dry the oil stains, rust layers and other impurities on the surface of the bolt 4, and then place it in an oven heated to 50°C for 10 minutes to ensure that the moisture in the tiny gaps on the surface of the bolt 4 is completely removed, so that the surface of the bolt 4 is completely dry and clean state to avoid re-oxidation of the bolt 4, and finally take it out for stress relief.

[0027] Stress relief: put into the furnace at warm temperature, keep warm in the furnace at 200°C for 4 hours, cool in the furnace or air to room temperature, and eliminate the internal stress caused by machining without changing the structure of the bolt 4 and ensuring the original strength of the bolt 4 , improve the bonding force between the chrome plating layer and the bolt surface, and increase the bolt strength.

[0028] Mounting: The kit B...

Embodiment 2

[0038] A method for partial chrome plating of stainless steel bolts of the present invention comprises the following steps.

[0039]Drying: Clean and dry the oil stains, rust layers and other impurities on the surface of the bolt 4, and then place it in an oven heated to 75°C for 8 minutes to ensure that the moisture in the tiny gaps on the surface of the bolt 4 is completely removed, so that the surface of the bolt 4 is completely dry and clean state to avoid re-oxidation of the bolt 4, and finally take it out for stress relief.

[0040] Stress relief: put into the furnace at warm temperature, keep it in the furnace at 206°C for 3.5 hours, cool in the furnace or air to room temperature, and eliminate the internal stress caused by mechanical processing without changing the structure of the bolt 4 and ensuring the original strength of the bolt 4. Stress, improve the bonding force between the chrome plating layer and the bolt surface, and increase the bolt strength.

[0041] Mo...

Embodiment 3

[0051] A method for partial chrome plating of stainless steel bolts of the present invention comprises the following steps.

[0052] Drying: Clean and dry the oil stains, rust layers and other impurities on the surface of the bolt 4, and then place it in an oven heated to 100°C for 5 minutes to ensure that the moisture in the tiny gaps on the surface of the bolt 4 is completely removed, so that the surface of the bolt 4 is completely dry and clean state to avoid re-oxidation of the bolt 4, and finally take it out for stress relief.

[0053] Stress relief: put into the furnace at warm temperature, keep warm in the furnace at 210°C for 2 hours, cool in the furnace or air to room temperature, and eliminate the internal stress caused by machining without changing the structure of the bolt 4 and ensuring the original strength of the bolt 4 , improve the bonding force between the chrome plating layer and the bolt surface, and increase the bolt strength.

[0054] Mounting: The kit B...

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Abstract

The invention discloses a method for partial chrome plating of stainless steel bolts, which belongs to the technical field of bolt surface treatment, and includes the steps of drying, stress relief, hanging, electrolytic degreasing, and chrome-plating activation. After 5-7 hours of electroplating by the above method, a chromium coating of 120-150um is formed on the surface of the bolt, and the difference in thickness of the coating is less than 3um, which solves the problem that the difference in thickness of the coating in the current electroplating method is 10-30um, which leads to uneven stress on the bolts. The problem is that the strength of the bolts is improved, and since the sets A, B, and C can be recycled, the problems of high cost and environmental protection of the current tapes are solved.

Description

technical field [0001] The invention belongs to the technical field of bolt surface treatment, and relates to a local chrome plating method for stainless steel bolts and a tooling assembly. Background technique [0002] In the fields of ships, aerospace, heavy machinery and equipment, etc., in order to make the stainless steel bolts meet the strength and wear resistance of the connecting parts under the condition of constant volume, some parts of the stainless steel bolt body need to be strengthened by chrome plating. The thickness of the chromium plating layer is 120~150um, which strengthens the strength and hardness of the stainless steel bolt itself. At the same time, the properties of the precious metal obtained by the metal chromium after air passivation also avoid oxidation on the surface of the stainless steel bolt body. [0003] At present, when chrome-plating stainless steel bolts, tapes are used to wrap parts of the stainless steel bolts that do not require chrome ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/06C25D5/02C25D5/36C21D9/00C25D17/06C25F1/06
CPCC21D9/0093C25D3/06C25D5/02C25D5/36C25D17/06C25F1/06
Inventor 袁光生代文彪
Owner GUIZHOU AEROSPACE PRECISION PRODS