Plasma Beam Chromium Plating Process of Piston Rod of Hydraulic Prop

A technology of hydraulic prop and plasma beam, which is applied in the field of surface treatment of hydraulic prop piston rod, can solve the problems of bubbling, bursting, peeling and inlaid stainless steel sleeves, etc., and achieves long service life, good resistance to coal particle impact, and fine structure Effect

Inactive Publication Date: 2018-01-12
武汉科技大学城市学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a plasma beam chrome plating process for a hydraulic prop piston rod, the purpose of which is to solve the problems of bubbling and peeling in the prior art and the problem of skin bursting in the inlaid stainless steel sleeve while reducing the production cost

Method used

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  • Plasma Beam Chromium Plating Process of Piston Rod of Hydraulic Prop
  • Plasma Beam Chromium Plating Process of Piston Rod of Hydraulic Prop

Examples

Experimental program
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Effect test

example 1

[0026] The present invention adopts the following steps to solve (with piston rod as an example)

[0027] Step 1, remove the incomplete chrome plating layer, pits and pits on the working surface of the piston rod on the lathe, so that the surface of the workpiece is free of defects (usually 2-3mm is removed by turning);

[0028] Step 2, surfacing the piston rod with gas shielded welding, the thickness of the surfacing layer is greater than the thickness removed by machining in step 1 (eg 3.5 mm).

[0029] Step 3, removing excess surfacing layer by car, so that the size of the piston rod is

[0030] Step 4, clean the surface with acetone or absolute alcohol;

[0031] Step 5, add 250ml of water glass to every 1kg of chromium alloy powder (particle size 75-150μm) to make a slurry, and stir evenly in a mixer (about 30 minutes). The composition of chromium alloy powder is: 0.1%C, 25%Ni, 8%Si, 0.7%B, 10%Fe, 56.20%Cr.

[0032] Step six, spray alloy powder with a thickness of 0...

example 2

[0036] When the present invention is applied to the manufacture of a hydraulic strut piston rod, the following steps are adopted (with piston rod as an example)

[0037] Step 1, process the hydraulic prop piston rod according to the drawing, the size of the processing part is

[0038] Step 2, clean the surface with acetone or absolute alcohol;

[0039] Step 3: Add 300ml of water glass to every 1kg of chromium alloy powder (with a particle size of 75-150μm), and stir in a mixer for 30 minutes to form a slurry. The composition of chromium alloy powder is: 0.05%C, 35%Ni, 5%Si, 1.0%B, 14%Fe, 44.95%Cr;

[0040] On surfaces requiring treatment,

[0041] Step 4, spray alloy powder with a thickness of 0.5mm on the working surface. Dry naturally for 24 hours, bake in an electric furnace at 60-80°C for 2 hours, then raise the temperature to 140-180°C for 4 hours.

[0042] Step 5, install the piston on the plasma processing machine, and perform plasma beam chrome plating-plasma a...

example 3

[0045] The present invention adopts the following steps to solve (with piston rod as an example)

[0046] Step 1, remove the incomplete chrome plating layer, pitting and pits on the working surface of the piston rod on the lathe, so that the surface of the workpiece is free of defects;

[0047] Step 2, surfacing the piston rod with gas shielded welding, the thickness of the surfacing layer is greater than the thickness removed by machining in step 1.

[0048] Step 3, removing excess surfacing layer by car, so that the size of the piston rod is

[0049] Step 4, clean the surface with acetone or absolute alcohol;

[0050] Step 5: Add 380ml of water glass to every 1kg of chromium alloy powder (particle size 75-150μm) to make a slurry, and stir in a mixer for 30 minutes to make it uniform. The composition of chromium alloy powder is: 0.08%C, 30%Ni, 6.5%Si, 0.5%B, 15%Fe, 47.92%Cr;

[0051] Step six, spray alloy powder with a thickness of 0.5mm on the working surface. Dry na...

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Abstract

The invention discloses a chromium plating technology for a piston rod of a hydraulic prop. The chromium plating technology includes the steps that firstly, the surface of the piston rod of the cleaned hydraulic prop is coated with a layer of chromium alloy powder; plasma chromium plating, namely plasma alloying is conducted on the surface of the piston rod of the hydraulic prop after drying; and therefore an alloy layer with metallurgical bonding is obtained on the working face of the piston rod, wherein the thickness of the alloy layer is 0.8-1.2 mm, the surface hardness of the alloy layer is larger than 45 HRc, the content of Cr the alloy layer is larger than 17%, and the content of Ni the alloy layer is larger than 9%. The product, namely the plasma chromium plating hydraulic prop piston rod, produced through the technology can meet coal mine conditions and solves the problems that an electrodeposited chromium hydraulic prop piston rod (or a plunger rod) is bubbled and stripped, and bark cracking happens after a stainless steel is mounted. The plasma beam chromium plating technology is free of pollution and environment-friendly, is used for the piston rod of the hydraulic prop and can be used for replacing the electrodeposited chromium technology seriously polluting the environment.

Description

technical field [0001] The invention belongs to the surface treatment technology of hydraulic prop piston rods, in particular to a plasma beam chrome plating process for hydraulic prop piston rods. Plasma beam chromium plating (referred to as plasma chromium plating) is to use plasma beam to form a chromium-containing alloy layer through the metallurgical chemical reaction of chromium alloy powder on the surface of the workpiece. The plasma beam chromium plating process belongs to the category of plasma beam surface metallurgy. Background technique [0002] Hydraulic props are widely used in roadway support and working face support in coal mines. With the technological progress of my country's coal mining industry and the continuous improvement of equipment levels, the annual use of hydraulic props is increasing, from less than 1 million in the country in the 1990s to more than 1 million per year at present. Due to the existence of damp, S-containing and other corrosive ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/04
Inventor 段伟陶锡麒周丽红谢剑刚徐文吴贺利卢君宜熊晓松
Owner 武汉科技大学城市学院
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