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Process for machining cylinder barrel of oil cylinder

A processing technology and cylinder technology, which is applied in metal processing equipment, manufacturing tools, workpiece edge parts, etc., can solve problems such as inability to meet heat treatment requirements, reduce welding defects, increase elongation after fracture, and improve safety and reliability Effect

Inactive Publication Date: 2014-05-21
QINGDAO XINGCHEN MACHINE TOOL
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  • 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 to produce more defects in the welding parts of the oil cylinder, and most of the failures of the oil cylinder are generated in the welding parts. of

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0009] The present invention will be further described below in conjunction with the examples: an oil cylinder barrel, the body material of which is Q345B, and its chemical composition percentage is: C ≤ 0.2, Si ≤ 0.5, Mn ≤ 1.7, P ≤ 0.035 , S ≤ 0.035,

[0010] Nb ≤ 0.07, V ≤ 0.15, Ti ≤ 0.2, Cr ≤ 0.3, Ni ≤ 0.5, Cu ≤ 0.3, N ≤ 0.012, Mo ≤ 0.1, and the rest is Fe. The processing method for the cylinder barrel of the above oil cylinder using Q345B hot-rolled steel pipe is: select the tube blank→cutting→

[0011] Straightening→rough turning outer circle→welding cylinder body and flange→scraping inner hole→rough turning→finish turning; the welding groove form of the cylinder body and flange welding is U-shaped groove, and the welding method is gas protection For welding, the protective gas composition is 80% Ar+20% CO2, the welding wire is flux-cored wire ER50-6, the diameter of the welding wire is φ1.2, and the welding parameters are as follows: welding current: 200-220A for the...

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Abstract

The invention discloses a process for machining a cylinder barrel of an oil cylinder, and belongs to the field of hydraulic cylinders. A body of the cylinder barrel is made of Q345B which includes Cr, Nb, Ni, V and other alloy elements, and the mechanical property and the welding property of Q345B are both better than those of 45# steel. The process for machining the cylinder barrel of the oil cylinder includes the steps of selecting a tube blank of a hot rolling steel tube, conducting discharging, conducting straightening, conducting rough cylindrical turning, welding flanges, scraping inner holes, conducting rough turning and conducting finish turning. The process is characterized in that welding parameters are as follows. The process has the advantages that the welding defects of the oil cylinder are reduced by more than 50%, the percentage elongation after fracture of the materials of the cylinder barrel is increased, toughness of the cylinder barrel is guaranteed, the risk that the cylinder barrel is fractured is reduced, and safe reliability of the oil cylinder is greatly improved.

Description

[0001] technical field [0002] The invention belongs to the field of construction machinery manufacturing, and in particular relates to an oil cylinder, in particular to an oil cylinder for a thread rolling machine. [0003] Background technique [0004] With the rapid development of my country's construction machinery industry, machines such as thread rolling machines have higher and higher requirements for the strength, toughness and welding performance of cylinder materials. Domestic mechanical oil cylinders are generally made of 45# steel pipes. 45# steel is general structural steel and belongs to medium carbon steel. Due to the increase of carbon 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 welding process to eliminate welding defects. In the actual production process, due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23P15/00
CPCB23P15/00B23K9/173B23K33/00B23K35/383C22C38/001C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 李京泉
Owner QINGDAO XINGCHEN MACHINE TOOL
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