Preparation method for protective coating of zinc pan roller sleeves and bushes

A protective coating and zinc pot roll technology, applied in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of shaft sleeve and bush wear, poor sliding performance, damage to zinc pot roll transmission parts, etc., to achieve The effect of improving production efficiency, increasing service life, improving wear resistance and lubricating performance

Active Publication Date: 2015-01-14
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the simultaneous action of corrosion, wear, high temperature and high mechanical force in the liquid zinc pot, it is very easy to cause damage to the transmission parts of the zinc pot roller. Normal operation of zinc pot rolls
[0005] Based on the chemical properties of cobalt-based alloys, which are difficult to dissolve in zinc liquid, it is used as a material for making shaft sleeves and bushings, but its physical properties, especially poor lubricating properties, cannot meet the needs of use. In order to increase shaft sleeves and bushings The lubricating performance of the bushing system is to add about 0.15-0.2wt% lead to the zinc pot to meet the requirements of the lubricating performance of the bushing and bushing, but it is easy to cause environmental pollution, so this method has been greatly reduced
With the sharp increase in production in modern enterprises, the strip sp

Method used

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  • Preparation method for protective coating of zinc pan roller sleeves and bushes
  • Preparation method for protective coating of zinc pan roller sleeves and bushes

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preparation example Construction

[0019] The preparation method of the zinc pot roll bushing and bush protective coating of the present invention comprises the following steps:

[0020] Step 1. Clean the surface of the shaft sleeve and bushing, remove dirt and preheat to 200-300°C;

[0021] Step 2: Use plasma surfacing equipment to carry out multi-layer powder surfacing welding on the bushing and bushing. The bottom layer combined with the bushing and bushing is made of a single cobalt-based alloy powder with low hardness to ensure the connection with the stainless steel substrate. Good combination, the surfacing powder materials of the remaining layers are cobalt-based alloy powder and boron nitride powder, and the components of cobalt-based alloy powder are 0.06~2.6wt%C, 8.0~32wt%Cr, 1.0~3.5wt%Si, 0.1~ 18wt% W, 1.0-30wt% Mo, 0.2-3.6wt% Fe, 1.0-3.6wt% Ni, the balance is Co, and the boron nitride powder content is 5-30wt%;

[0022] Step three, such as figure 1 and figure 2 As shown, the plasma surfacing eq...

Embodiment approach 1

[0035] Process the 316L stainless steel base material of the shaft sleeve to the required size before surfacing and clean the surface, preheat the furnace to 250°C, and the underlying cobalt-based alloy powder composition is: 1.0wt%C, 29wt%Cr, 2.0wt%Si, 4.5wt% %W, 1.0wt% Mo, 2.0wt% Fe, 2.0wt% Ni, the powder feeding rate of the bottom layer is 80g / min. The surface layer cobalt-based alloy powder composition is: 2.0wt% C, 29wt% Cr, 2.0wt% Si, 12wt% W, 1.0wt% Mo, 2.0wt% Fe, 2.0wt% Ni, and the powder feeding rate of the surface layer is 68g / min , At the same time, the boron nitride powder is fed by an external pipeline, and the powder feeding amount is 20g / min.

[0036] Surfacing welding parameters are: spray distance 8mm, transfer arc current 240A, voltage about 28V, rotate the sleeve workpiece at a moving speed of 130mm / min, move the welding torch at a speed of 40% of welding bead lap, ion gas 250L / h, shielding gas 1000L / min h, powder feeding gas 200L / h, the gas is argon. The ...

Embodiment approach 2

[0038] Process the 316L stainless steel base material of the shaft sleeve to the required size before surfacing and clean the surface. The furnace is preheated to 240°C. The underlying cobalt-based alloy powder composition is: 1.4wt%C, 29wt%Cr, 2.0wt%Si, 8.5wt% %W, 1.0wt% Mo, 2.0wt% Fe, 2.0wt% Ni, the powder feeding rate of the bottom layer is 80g / min. The surface layer cobalt-based alloy powder composition is: 1.4wt%C, 29wt%Cr, 2.0wt%Si, 8.5wt%W, 1.0wt%Mo, 2.0wt%Fe, 2.0wt%Ni, and the powder feeding amount of the surface layer is 70g / min, at the same time, the boron nitride powder is fed by an external pipeline, and the powder feeding amount is 15g / min.

[0039] Surfacing welding parameters are: spray distance 8mm, transfer arc current 240A, voltage about 28V, rotate the sleeve workpiece at a moving speed of 120mm / min, move the welding torch at a speed of 50% of the welding bead, ion gas 250L / h, shielding gas 1000L / min h, powder feeding gas 200L / h, the gas is argon. The sin...

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Abstract

The invention discloses a preparation method for a protective coating of zinc pan roller sleeves and bushes. The method comprise: cleaning and preheating surfaces of a roller sleeve and a bush, employing plasma built-up welding equipment to performing multi-layer powder built-up welding, selecting single cobalt-base alloy with relatively low hardness as a built-up welding combination bottom layer, and employing a cobalt-base alloy powder and a boron nitride powder as other layers of built-up welding powder materials, arranging two powder feeders respectively for putting the cobalt-base alloy powder and the boron nitride powder on the plasma built-up welding equipment, and respectively setting powder sending parameters, so as to realize independent sending of the two powders; and setting corresponding built-up welding parameters, keeping warm of the interior of a furnace after built-up welding and slowly cooling along with the furnace, and performing machining the built-up welded layer to obtain the protective coating with the thickness of 2.0-15 mm. By using the protective coating prepared by the method and used for the roller sleeve and the bush, the service life of the roller sleeve and the bush is effectively improved, the wear resistance and the lubrication performance are improved, strip steel is guaranteed to smoothly enter or get out of a zinc liquid system of a zinc pan, and the production efficiency of hot galvanized plates and strips is improved.

Description

technical field [0001] The invention relates to a method for preparing zinc pot roll bushings and protective coatings for bushings. Background technique [0002] In the metallurgical industry, zinc pots are used for hot-dip galvanizing treatment of hot-dip galvanized strips. Hot-dip galvanized strips are mostly used in automobiles, construction and household appliances industries, especially the casings of various cars or household appliances. [0003] Because it is a large-scale industrial production, in the large-scale continuous production process, most of the cold-rolled metal strips used as the base material of hot-dip galvanized sheets reach 40 tons of coils before unrolling, and the cold-rolled metal strips are pickled and continuously Annealing, zinc pot hot-dip galvanizing and other production treatments and chemical treatments are re-coiled. [0004] Usually, the zinc pot roll shaft is composed of a sinking roll and two stabilizing rolls. The sinking roll is a pas...

Claims

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Application Information

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IPC IPC(8): C23C24/04B22F1/00C22C19/07B23K10/02
CPCB23K10/027C22C19/07C22C32/0068
Inventor 徐建明王树保傅卫王倩
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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