A system and method for repairing and remanufacturing a cylinder block of a large-diameter hydraulic cylinder

A hydraulic cylinder and large-diameter technology, which is applied in the field of equipment repair and remanufacturing, can solve the problems of difficult formation of inner surface cladding layer, large difference between the outer edge and inner edge of the light spot, and high cost, so as to achieve good economic applicability and improve stress resistance Corrosion and anti-wear performance, effect of improving surface quality

Active Publication Date: 2016-08-31
SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of large-area inner surface cladding, the difference between the outer edge and inner edge of the spot is large, and the weld seam is narrow, so it is difficult to form a perfect large-area inner surface cladding layer. The most important thing is that the cost of the oil cylinder repaired by this process is often several times higher than the cost of the new hydraulic oil cylinder, and there is no economic applicability for remanufacturing

Method used

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  • A system and method for repairing and remanufacturing a cylinder block of a large-diameter hydraulic cylinder
  • A system and method for repairing and remanufacturing a cylinder block of a large-diameter hydraulic cylinder
  • A system and method for repairing and remanufacturing a cylinder block of a large-diameter hydraulic cylinder

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Effect test

Embodiment 1

[0047] The inner diameter is Ф280mm, the maximum stress corrosion depth is 1mm, and the maximum expansion cylinder is 5mm (the size of the expansion cylinder is the diameter of the expansion cylinder, which is the diameter difference of the inner wall before and after the expansion cylinder of the cylinder body. For the 5mm expansion cylinder, the deformation deviation of the inner wall on one side is 2.5mm. The same below) to repair and remanufacture the large-diameter hydraulic cylinder block, including the following steps:

[0048] (1) The hydraulic cylinder is heated and degreased, and the heating is carried out in a box-type oven with a heating temperature of 100°C and a heat preservation of 1.5 hours;

[0049] (2) Use a water-soluble coloring flaw detection agent for coloring flaw detection on the inner surface to ensure that there are no buried defects on the inner surface of the oil tank;

[0050] (3) Sandblast the inner surface of the cylinder after the treatment in s...

Embodiment 2

[0058] The repair and remanufacturing of large-diameter hydraulic cylinders with an inner diameter of Ф320mm, a maximum stress corrosion depth of 1mm, and a maximum cylinder expansion of 7mm (the maximum deviation of one-sided inner wall size deformation is 3.5mm) includes the following steps:

[0059] (1) Heat and degrease the hydraulic cylinder in a box-type oven at a heating temperature of 120°C for 1 hour;

[0060] (2) Use a water-soluble coloring flaw detection agent for coloring flaw detection on the inner surface to ensure that there are no buried defects on the inner surface of the oil tank;

[0061] (3) Sandblast the inner surface of the cylinder after the treatment in step (2), the sand material is 60 mesh brown corundum, and the sandblasting air pressure is 0.65Mpa;

[0062] (4) Perform automatic argon arc welding on the inner surface of the oil cylinder after step (3). The welding wire is H12Cr24Ni13Si, the diameter of the welding wire is 1.6mm, the wire feeding sp...

Embodiment 3

[0069] The repair and remanufacturing of large-diameter hydraulic cylinders with an inner diameter of Ф360mm, a maximum stress corrosion depth of 1.5mm, and a maximum cylinder expansion of 8mm (the maximum deviation of dimensional deformation of the inner wall on one side is 4mm) includes the following steps:

[0070] (1) Heat and degrease the hydraulic cylinder in a box-type oven at a heating temperature of 150°C for 1 hour;

[0071] (2) Use a water-soluble coloring flaw detection agent for coloring flaw detection on the inner surface to ensure that there are no buried defects on the inner surface of the oil tank;

[0072] (3) Sandblast the inner surface of the cylinder after the treatment in step (2), the sand material is 70 mesh brown corundum, and the sandblasting air pressure is 0.75Mpa;

[0073] (4) Perform automatic argon arc welding on the inner surface of the oil cylinder after step (3). The welding wire is H12Cr24Ni13Si, the diameter of the welding wire is 1.6mm, the...

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Abstract

The invention provides a system and method for repairing and remanufacturing a large-diameter hydraulic cylinder body. The system includes a low-temperature argon arc welding girth welding device and a cylinder body fixing device. The method designs a low-temperature argon arc welding inner surface girth welding Combined solution with nitriding of the inner surface layer, in which the process conditions are innovated in the inner surface ring welding of low-temperature argon arc welding: welding wire H12Cr24Ni13Si, welding wire diameter 1.2, 1.6 or 2.0mm, wire feeding speed 1400‑1600mm / min, premelting time 3s , Arc ignition current 60‑70A, width of each weld seam 4‑8mm, welding thickness 3‑8mm, cylinder rotation speed 300‑350mm / min, welding head feed rate 3‑7mm / r, argon delivery volume 8L / min. Through the method of the present invention, under the premise of greatly reducing the ellipticity deformation of the cylinder body generated during the repair process of the inner surface, the bonding strength of the repair layer is improved, and the repair layer has better stress corrosion resistance and wear resistance than the new product. At the same time, good economic applicability is taken into account, and the reutilization of the large-diameter hydraulic oil cylinder body is realized through the repair method.

Description

technical field [0001] The invention relates to the technical field of equipment repair and remanufacturing, and more specifically relates to a system and method for repairing and remanufacturing a cylinder body of a large-diameter hydraulic cylinder. Background technique [0002] Hydraulic support is an important equipment in the mining industry, it can reliably and effectively support and control the roof of the working face, prevent gangue from entering the mining face and push the conveyor. The cylinder block of the hydraulic cylinder is an important part of the hydraulic support. It is a pressure-bearing structural part used to control the mine pressure of the mining face. The pressure-bearing capacity and reliability of the hydraulic cylinder often directly affect the working efficiency and safety of the mining face. In actual mining and use, due to long-term high pressure and weakly acidic humid environment, the oil cylinder body is prone to local or even overall swel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00B23K9/16
CPCB23K9/16B23P6/02
Inventor 王春昌陈瑞张鹏刘鸣苏成明
Owner SHAANXI TIANYUAN MATERIALS PROTECTION TECH
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