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Crack and leakage processing method for hydraulic tube of aluminum extruding machine

An aluminum extrusion press and hydraulic oil pipe technology, applied in the field of mechanical maintenance, can solve the problems of defective welding, easy cracks in hydraulic oil pipes, oil leakage, etc., and achieve the effect of eliminating leakage problems.

Inactive Publication Date: 2015-06-10
铜陵市永生机电制造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) The working environment of the hydraulic system of the extrusion machine is harsh, and the weld seam and welding heat-affected zone of the hydraulic oil pipe are prone to cracks during operation, resulting in oil leakage
(2) Defective welding
(3) There is a large welding residual internal stress and a large binding force generated during assembly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] 20# seamless pipe is used as the pipeline of the hydraulic system. When the pipe is connected with the pipe, the bevel should be opened, and the blunt edge should be left 1-1.5mm. Manual arc welding is used, J427 is used as the welding consumable, and it is baked at 350°C for 1 h before welding. DC reverse connection and short arc narrow channel welding are used during welding.

[0007] The welding of pipe and flange belongs to the welding of dissimilar steel. The 20° seamless steel pipe is connected to the 45° steel flange. During welding, the embroidery, water, burrs and foreign objects at the welding joint are removed, and the flange must be grooved. Insert the pipe into the joint body for 10-15 minutes, and soak the joint with 60°C hydraulic oil before welding.

[0008] After adopting this process, the pipe-to-pipe welding of the hydraulic oil pipe eliminates the leakage problem.

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PUM

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Abstract

This invention discloses a crack and leakage processing method for a hydraulic pipe of an aluminum extruding machine. The method is characterized by taking 20# seamless tubes as hydraulic system pipelines, beveling the tubes in butt joint, reserving 1-1.5 mm on the truncated edges, removing foreign matters, using four symmetrical points for welding and locating, selecting manual arc welding, using J427 as the welding material, performing roasting at 350 DEG C for 1 h before welding, and using direct current reverse polarity and short arc narrow path during welding. Tube and flange welding belongs to dissimilar steel welding. When a 20-degree seamless steel tube is connected with a 45-degree steel flange, rusts, water, burrs and foreign matters at the welded junction are removed, the flange is beveled, and the tube is inserted into a joint body for 10-15 min. Before welding, the joint is soaked in hydraulic oil at 60 DEG C. By using the process, leakage of the tube welding of the hydraulic tube is eliminated.

Description

technical field [0001] The invention relates to the field of mechanical maintenance, in particular to a pipeline maintenance method. Background technique [0002] The hydraulic oil pipe is the oil passage of the inlet circuit in the hydraulic system of the extrusion machine. The oil pipe has a thick wall and various shapes, and the difference between the joint and the joint is large after assembly. There are several problems after welding pipes and pipes, pipes and joints. (1) The working environment of the hydraulic system of the extrusion machine is harsh, and the weld seam and welding heat-affected zone of the hydraulic oil pipe are prone to cracks during operation, resulting in oil leakage. (2) Welding is defective. (3) There is a large welding residual internal stress and a large binding force generated during assembly. The oil pipe of the extruder is a 20° seamless steel pipe, and the flange is a 45° steel, and the weldability of the two is different. Contents of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/04
CPCB23P6/04
Inventor 朱俊生
Owner 铜陵市永生机电制造有限责任公司
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