Method for machining cylinder tube of oil cylinder

A processing method and cylinder barrel technology are applied in the processing field of oil cylinder barrels, which can solve problems such as inability to meet welding requirements, and achieve the effects of reducing welding defects, reducing the risk of brittle fracture, and improving elongation after fracture.

Inactive Publication Date: 2014-05-21
QINGDAO XINGCHEN MACHINE TOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the actual production process, due to the limitation of the structure and processing method of the oil cylinder, these welding requirements cannot be met in many cases, so it is inevitable to produce more defects in the welded parts of the oil cylinder. In reality, most of the faults and quality problems are in the produced by welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] Further illustrate processing method and effect of the present invention below in conjunction with embodiment.

[0009] Use Q345B cold-drawn steel pipe, raw material specifications: diameter 273×18, inner diameter after cold drawing 229mm, inner diameter after processing 230mm (+0.07 ~ +0.03), processing equipment adopts 5m scraping roller burnishing machine. This processing method is mainly used in products with higher strength requirements. The strength performance of the steel pipe is improved by cold drawing processing. The outer circle of the steel pipe generally does not need to be machined, and the inner hole is directly welded and scraped.

[0010] The specific process flow is: cold drawing→straightening→cutting→welding flange→scraping inner hole→rough turning→finish turning.

[0011] The cold drawing method is: select the tube blank → blank annealing → pickling → phosphating → saponification → cold drawing 1 (264 / 230) → phosphating → saponification → cold d...

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Abstract

The invention discloses a method for machining a cylinder tube of an oil cylinder and belongs to the field of hydraulic cylinders. The body of the cylinder tube is made of Q345B, and the Q345B contains Cr, Nb, Ti, Ni, V and other alloying elements and is superior to 45# steel in mechanical property and welding property. A cold-drawn steel pipe is adopted in the method; the method includes the steps of cold drawing, natural aging, straightening, blanking, flange welding, inner hole skiving, rough turning and finish turning, and is characterized by welding technological parameters, cold-drawing technological parameters and skiving technological parameters. The method has the advantages that welding defects of the oil cylinder are reduced by more than 55%, the percentage elongation after fracture of the cylinder tube is improved, the tenacity of the cylinder tube is guaranteed, the risks of brittle fracture of the cylinder tube are reduced, and therefore the safety and reliability of the air cylinder are improved.

Description

technical field [0001] The invention belongs to a processing method of an oil cylinder barrel, and specifically relates to a processing method for processing an oil cylinder barrel by using a cold drawn steel pipe, which is mainly applied to a wire rolling machine and belongs to the machine tool manufacturing industry. Background technique [0002] With the rapid development of my country's machine tool industry, wire rolling machines and other machinery 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 a general structural steel, but due to the increase in carbon content, the welding performance will also deteriorate. 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. ...

Claims

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Application Information

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