Hydraulic support oil cylinder refabrication method based on CMT (Cold Metal Transition)

A hydraulic support and remanufacturing technology, which is applied in the field of metal surface engineering, can solve the problems of high cost, waste of resources, and large thermal deformation of oil cylinders, etc., and achieve the effects of improving service life, reducing overall cost, and reducing heat input

Inactive Publication Date: 2019-08-20
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The hydraulic support is the main load-bearing part for support in underground coal mining operations. Due to its harsh working conditions, it is often exposed to high temperature and high humidity conditions, and is susceptible to corrosion and wear; at the same time, the splashed hard Coal gangue particles are easily attached to the surface of the hydraulic support column, which can easily lead to failure of the hydraulic support cylinder seal ring
In this way, various corrosive media and hard granular substances can easily slip into the hydraulic support cylinder through the surface of the column, and continuously wear and corrode the inner wall of the cylinder, resulting in early failure of the hydraulic support cylinder.
[0003] If the damaged hydraulic support cylinder is directly scrapped, it is not environmentally friendly and will caus

Method used

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  • Hydraulic support oil cylinder refabrication method based on CMT (Cold Metal Transition)
  • Hydraulic support oil cylinder refabrication method based on CMT (Cold Metal Transition)

Examples

Experimental program
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Effect test

Example Embodiment

[0033] Example 1

[0034] (1) The corrosion fatigue layer on the inner wall of the cylinder to be repaired is removed by machining, and the machining amount is 1mm on one side; the inner wall of the cylinder is cleaned with absolute ethanol to remove the surface oxide, oil and other impurities to obtain the pre-treated hydraulic support cylinder ;

[0035] (2) Perform CMT welding on the inner wall of the pretreatment hydraulic support cylinder. The welding wire selected for CMT welding is 316L stainless steel wire with a diameter of 1.0mm; the welding process parameters are: gas flow rate of 10L / min, argon purity of 99.99%, welding current It is 140A, the welding voltage is 12V, the welding speed is 200mm / min, and the DC reverse connection; the control welding gun angle α is 83°, the welding position angle β is 5°, and the welding wire extension length is 10mm; the special lengthened welding gun penetrates into the cylinder Hole to realize CMT welding of 316L stainless steel weldi...

Example Embodiment

[0038] Example 2

[0039] (1) The corrosion fatigue layer on the inner wall of the cylinder to be repaired is removed by machining, with a unilateral machining volume of 2mm; the inner wall of the cylinder is cleaned with anhydrous alcohol to remove the surface oxide, oil and other impurities to obtain the pre-treated hydraulic support cylinder;

[0040] (2) CMT welding is performed on the inner wall of the pretreatment hydraulic support cylinder. The welding wire selected for CMT welding is 316L stainless steel wire with a diameter of 1.2mm; the welding process parameters are: gas flow rate of 15L / min, argon purity of 99.99%, welding current It is 180A, the welding voltage is 16V, the welding speed is 220mm / min, DC reverse connection; the control welding gun angle α is 87°, the welding position angle β is 7°, and the welding wire extension length is 15mm; the special lengthened welding gun penetrates into the cylinder Hole to realize CMT welding of 316L stainless steel wire on the...

Example Embodiment

[0043] Example 3

[0044] (1) The corrosion fatigue layer on the inner wall of the cylinder to be repaired is removed by machining, with a unilateral machining volume of 1mm; the inner wall of the cylinder is cleaned with anhydrous alcohol to remove the surface oxides, oil and other impurities to obtain the pretreatment hydraulic support cylinder;

[0045] (2) Perform CMT welding on the inner wall of the pretreatment hydraulic support cylinder. The welding wire selected for CMT welding is 316L stainless steel wire with a diameter of 1.0mm; the welding process parameters are: gas flow rate of 12L / min, argon purity of 99.99%, welding current The welding voltage is 150A, the welding voltage is 14V, the welding speed is 200mm / min, and the DC reverse connection; the control welding gun angle α is 84°, the welding position angle β is 7°, and the welding wire extension length is 10mm; the special lengthened welding gun penetrates into the cylinder Hole to realize CMT welding of 316L stain...

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Abstract

The invention provides a hydraulic support oil cylinder refabrication method based on CMT and belongs to the technical field of metal surface engineering. The hydraulic support oil cylinder refabrication method comprises the steps that mechanical machining and cleaning are firstly performed on the oil cylinder inner wall to be repaired in sequence, then CMT welding is performed on the hydraulic support oil cylinder inner wall, finally, the mechanical machining is performed on a CMT weld layer, and a refabricated hydraulic support oil cylinder is obtained. According to the hydraulic support oilcylinder refabrication method based on the CMT, the cold metal transition welding technology is utilized to weld the hydraulic support oil cylinder inner wall, heat input and spatter are less in thewelding peocess, the fact that the refabricated oil cylinder will not lose efficacy due to heat deformation can be guaranteed, and the service life of the oil cylinder is prolonged; by means of the manner that the mechanical machining is performed on the oil cylinder inner wall before and after the welding, the surface smoothness, the size and the tolerance of the oil cylinder all can be guaranteed to meet the drawing requirements; and meanwhile, the refabrication method provided by the invention is low in cost and high in efficiency, and full-automatic production can be realized.

Description

technical field [0001] The invention relates to the technical field of metal surface engineering, in particular to a method for remanufacturing a hydraulic support cylinder based on CMT. Background technique [0002] The hydraulic support is the main load-bearing part for support in underground coal mining operations. Due to its harsh working conditions, it is often exposed to high temperature and high humidity conditions, and is susceptible to corrosion and wear; at the same time, the splashed hard Coal gangue particles are easily attached to the surface of the hydraulic support column, which can easily lead to failure of the hydraulic support cylinder seal ring. In this way, various corrosive media and hard granular substances can easily slide into the hydraulic support cylinder through the surface of the column, and continuously wear and corrode the inner wall of the hydraulic cylinder, resulting in early failure of the hydraulic support cylinder. [0003] If the damaged...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 付宇明张钰付晨郑丽娟
Owner YANSHAN UNIV
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