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A Chromium Plating Method for the Inner Hole of Parts with Reduced Diameter

A technology of parts and inner holes, which is applied in the field of chrome plating of inner holes of variable diameter parts, can solve the problems of poor uniformity of coating thickness and achieve the effect of improving the uniformity of coating thickness

Active Publication Date: 2018-07-24
SHANXI NORTH MACHINE BUILDING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for chrome-plating the inner hole of a variable-diameter part, which solves the problem of poor uniformity of the coating thickness when the double-positioning mobile anode chrome-plates the inner hole with a variable cross-section.

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  • A Chromium Plating Method for the Inner Hole of Parts with Reduced Diameter
  • A Chromium Plating Method for the Inner Hole of Parts with Reduced Diameter

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Embodiment Construction

[0014] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail.

[0015] The invention provides a chrome-plating method for the inner hole of a variable-diameter part. The inner hole of the part includes a conical hole section and a straight hole section. The small end of the conical hole is connected to the straight hole section and has the same diameter. The specific steps include:

[0016] Step 1. Clean the surface of the inner hole of the part, and connect a lengthening pipe at both ends of the part. The inner diameter of the lengthening pipe is the same as the inner diameter of the straight hole section of the part; clamp the part on the chrome-plated cathode hanger;

[0017] Step 2. Lift the parts into the plating tank and preheat for 10 minutes;

[0018] Step three, such as figure 1 As shown, the anode rod is lengthened to 1200mm, its effecti...

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Abstract

The invention discloses a chrome-plating method for the inner hole of a variable-diameter part. The inner hole of the part includes a conical hole section and a straight hole section. The small end of the conical hole is connected with the straight hole section and has the same diameter. Connect a long tube to each end of the part, lift the part to the plating tank for preheating; use the anode rod for chrome plating, adjust the starting position of the anode rod, perform anodic treatment, and then adjust the electroplating power supply to positive chrome plating; gradually increase to Under normal process conditions and current density, the anode rod reciprocates up and down on the surface of the inner hole of the part, and the set coating thickness is achieved by controlling the output current and the reciprocating times of the anode rod. The invention can effectively ensure that the anode rod remains in the center of the part and is coaxial with the part. It has the effect of improving the uniformity of coating thickness.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and relates to a chrome-plating method for inner holes of variable-diameter parts. Background technique [0002] For the existing variable-diameter parts, especially the parts whose inner hole is divided into conical hole section and straight hole section, chrome is plated in the hole of the conical hole section with variable cross-section at one end, and the inner hole of the straight hole section has a thicker coating, and the conical hole section has a thicker coating. The coating of the hole section is relatively thin, which is 0.04-0.08mm milky white chrome. At present, the method of double positioning mobile anode chrome plating has the problem of large deviation of coating thickness. After chrome plating, the uniformity of the coating on the cylindrical section is poor, and the maximum axial and radial thickness deviation is 0.02mm. [0003] The double positioning mobile anode chr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D7/04C25D17/12C25D3/04
CPCC25D3/04C25D7/04C25D17/12
Inventor 张曙娟薛晓明郭俊文王瑞栋高志红
Owner SHANXI NORTH MACHINE BUILDING
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