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 cause a serious waste of resources
At present, there is no general process for repairing hydraulic support cylinders, because similar to gas shielded welding, surfacing welding and other processes, there is a disadvantage of large heat input, which leads to the repaired cylinders being scrapped due to large thermal deformation and cannot be used any longer; Since the repair of the inner wall of the oil cylinder belongs to the repair of the inner hole, other technological means such as spraying and spray welding cannot realize the repair of the inner wall of the oil cylinder.
[0004] At present, some companies at home and abroad use laser cladding to repair the inner wall of the worn oil cylinder, but due to the problems of complex process, high cost and low efficiency, and the need for special equipment, the cost is high, and it is difficult to to promote

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
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Remove the corrosion fatigue layer on the inner wall of the oil cylinder to be repaired by machining, and the single-side processing amount of the machining is 1 mm; use absolute ethanol to clean the inner wall of the oil cylinder, remove oxides, oil stains and other impurities on the surface, and obtain a pretreated hydraulic support oil cylinder ;

[0035] (2) Carry out CMT welding on the inner wall of the pretreatment hydraulic support cylinder. The welding wire selected for CMT welding is 316L stainless steel welding wire with a diameter of 1.0mm; the welding process parameters are: gas flow rate is 10L / min, argon gas purity is 99.99%, welding current The welding voltage is 140A, the welding voltage is 12V, the welding speed is 200mm / min, and the DC is reversed; the welding torch angle α is controlled to 83°, the welding position angle β is 5°, and the welding wire extension length is 10mm; the special extended welding torch penetrates into the oil cylinder hole...

Embodiment 2

[0039] (1) Remove the corrosion fatigue layer on the inner wall of the oil cylinder to be repaired by machining, with a single-side processing amount of 2mm; use absolute alcohol to clean the inner wall of the oil cylinder, remove oxides, oil stains and other impurities on the surface, and obtain a pretreated hydraulic support oil cylinder;

[0040] (2) Carry out CMT welding on the inner wall of the pretreatment hydraulic support cylinder. The welding wire selected for CMT welding is 316L stainless steel welding wire with a diameter of 1.2mm; the welding process parameters are: gas flow rate is 15L / min, argon gas purity is 99.99%, welding current The welding voltage is 180A, the welding voltage is 16V, the welding speed is 220mm / min, and the DC is reversed; the welding torch angle α is controlled to 87°, the welding position angle β is 7°, and the welding wire extension length is 15mm; the special extended welding torch penetrates into the oil cylinder hole, to achieve CMT weld...

Embodiment 3

[0044] (1) Remove the corrosion fatigue layer on the inner wall of the oil cylinder to be repaired by machining, with a single-side processing amount of 1 mm; use absolute alcohol to clean the inner wall of the oil cylinder, remove oxides, oil stains and other impurities on the surface, and obtain a pretreated hydraulic support oil cylinder;

[0045] (2) Carry out CMT welding on the inner wall of the pretreatment hydraulic support cylinder. The welding wire selected for CMT welding is 316L stainless steel welding wire with a diameter of 1.0mm; the welding process parameters are: gas flow rate is 12L / min, argon gas purity is 99.99%, welding current The welding voltage is 150A, the welding voltage is 14V, the welding speed is 200mm / min, and the DC is reversed; the angle α of the welding torch is controlled to 84°, the angle β of the welding position is 7°, and the length of the welding wire is 10mm; the special extended welding torch penetrates into the oil cylinder hole, to achi...

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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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