Cylinder barrel of oil cylinder of crane and processing process thereof

A crane oil and processing technology technology, applied in the field of oil cylinders and cylinders, can solve problems such as inability to meet heat treatment requirements, achieve the effects of reducing welding defects, reducing the risk of brittle fracture, and ensuring toughness

Active Publication Date: 2012-06-27
XCMG HYDRAULICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, due to the limitation of the structure and processing technology of the oil cylinder, these heat treatment requirements cannot be met in many cases, so it is inevitable that there will be more defects in the welded parts of the oil cylinder. Most of the faults and quality feedback of construction machinery are generated at the welding site

Method used

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  • Cylinder barrel of oil cylinder of crane and processing process thereof
  • Cylinder barrel of oil cylinder of crane and processing process thereof
  • Cylinder barrel of oil cylinder of crane and processing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Directly use Q345B hot-rolled steel pipe for processing, raw material specification: Φ152*16, inner hole Φ120mm, inner hole size after processing: Φ125mm (+0.07~+0.03), processing equipment adopts 3-meter scraping roller burnisher of SIDRRA company in the United States. The products produced by this processing method do not have high requirements for strength, but have higher requirements for safety. After the outer circle of the steel pipe is machined, the inner hole is scraped after welding the flange.

[0016] The processing process is: select the tube blank → blanking → straightening → rough turning the outer circle → welding the cylinder body and flange → scraping the inner hole → rough turning → fine turning;

[0017] As shown in the attached figure, the welding groove form is U-shaped groove. The welding method is gas shielded welding, the shielding gas composition is 80% Ar+20% CO2, the welding wire is flux-cored wire ER50-6, the diameter of the welding wire is ...

Embodiment 2

[0025] Use Q345B cold-drawn steel pipe, raw material specification: Φ273*18, inner hole after cold drawing Φ229mm, inner hole size after processing: Φ230mm (+0.07~+0.03), processing equipment adopts 5-meter scraping and rolling machine from Italian TACCHI company. This processing method is mainly used in products that require higher strength. The strength performance of the steel pipe is improved by cold drawing processing. The outer circle of the steel pipe does not need to be machined, and the inner hole is directly welded and scraped.

[0026] The specific process flow is: cold drawing→straightening→cutting→welding flange→scraping inner hole→rough turning→finish turning.

[0027] The cold drawing process is: selection of tube blank → blank annealing → pickling → phosphating → saponification → cold drawing 1 (264 / 230) → phosphating → saponification → cold drawing 2 (260 / 229) → finished product tempering; the blank annealing Temperature: 850±10℃, finished product tempering te...

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Abstract

The invention discloses a cylinder barrel of an oil cylinder of a crane and a processing process thereof. The invention belongs to the field of hydraulic cylinders. The material of a cylinder barrel body is Q345B. The material contains alloy elements, such as Cr, Nb, Ni, V and the like, and the mechanical property and the welding property are both better than those of 45# steel. The processing process comprises the following steps: (1) using a hot rolling steel pipe: selecting on a pipe blank, blanking, aligning, rough turning on an outer circle, welding on a flange, scraping on an inner hole, rough turning and finish turning; and (2) using a high-accuracy cold drawing steel pipe: cold drawing, aligning, blanking, welding on a flange, scraping on an inner hole, rough turning and finish turning; and the cylinder barrel of the oil cylinder of the crane and the processing process thereof are characterized by the technological parameter of welding, the technological parameter of cold-drawing processing and the technological parameter of scraping processing. The cylinder barrel of the oil cylinder of the crane and the processing process thereof have the beneficial effects that the welding defect of the oil cylinder is lowered by more than 50 percent; and moreover, the after-fracture elongation rate of the material of the cylinder barrel is enhanced, the toughness of the cylinder barrel is ensured, and the danger of the occurrence of brittle fracture of the cylinder barrel is decreased, so that the safety reliability of the oil cylinder is greatly enhanced.

Description

technical field [0001] The invention relates to an oil cylinder barrel, in particular to a crane oil cylinder barrel and a processing technology thereof, which are mainly used in automobile cranes and belong to the engineering machinery manufacturing industry. technical background [0002] With the rapid development of my country's construction machinery industry, construction machinery such as large-tonnage truck cranes and pump trucks have higher and higher requirements for the strength, toughness and welding performance of cylinder materials. Domestic engineering machinery oil cylinders are generally manufactured with 45# steel pipes. 45# steel is general structural steel and belongs to medium carbon steel. Due to the increase of C content, the welding performance will also decrease at the same time. Due to the high carbon content of 45# steel pipe, measures such as preheating, post-weld heat preservation, and post-weld heat treatment must be carried out during the weldin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B23P15/00B23K9/16F16J10/00
Inventor 王家聪生敏刘庆教陈登民张超峰杨立志
Owner XCMG HYDRAULICS CO LTD
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