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Welding method for jack cylinder-barrel accessory

The technology of a jack cylinder and a welding method is applied in the field of jack manufacturing, which can solve the problems affecting the service life of the product and the deformation of the cylinder barrel, and achieve the effects of reducing heat input, reducing product failure rate and improving overall quality level.

Active Publication Date: 2017-10-03
ZHENGZHOU COAL MINING MACHINERY GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a welding method for jack cylinder accessories, which aims to solve the problem that the traditional welding process easily causes the deformation of the cylinder and affects the service life of the product

Method used

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  • Welding method for jack cylinder-barrel accessory
  • Welding method for jack cylinder-barrel accessory
  • Welding method for jack cylinder-barrel accessory

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Embodiment Construction

[0020] The welding method of the present invention will be described in more detail below by welding the liquid-through seat on the surface of the cylinder (it can also be a joint seat, etc., the method is the same).

[0021] Such as Figure 1-3 As shown, the present invention welds the liquid-through seat on the cylinder barrel of the jack, and the steps are:

[0022] The first step is to draw the assembly boundary line and the vertical and horizontal centerline of the liquid seat 2 on the cylinder 1 made of 27SiMn or 30CrMo, and determine the tailor welding position of the liquid seat 2;

[0023] In the second step, set the cylinder on cylinder 1 as figure 1 The shown profiling ferrule 3 with threaded holes on both sides, when the bore diameter of the cylinder is 140-250mm, the profiling ferrule 3 can be made of Q690 high-strength steel, its thickness δ is 40mm, and it is made by quenching and tempering. It can play a good role in clamping the cylinder; if figure 2 , 3 ...

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Abstract

The invention discloses a welding method for a jack cylinder-barrel accessory. Firstly, an accessory assembly border line and longitudinal and transverse centerlines are drawn on a cylinder barrel, and the welding position of the accessory is determined; then a copying clamping sleeve provided with threaded holes on the two sides is mounted on the cylinder barrel in a sleeving mode, and closed to a to-be-welded accessory of one side of a cylinder opening, and the connecting line of centers of threaded holes of the copying clamping sleeve passes through the center of the cylinder barrel and is perpendicular to the connecting line of the central point of the to-be-welded accessory and the center of the cylinder barrel; bolts are screwed in the threaded holes of the two sides of the copying clamping sleeve to compress the cylinder barrel, so that the inner hole of the cylinder barrel generates radial predeformation; by adopting 80% of Ar and 20% of CO2 mixed gas arc welding and using an ER50-6 welding wire of phi 1.2 mm in cooperation, small specification welding is conducted on the accessory and the cylinder barrel; and finally after a welded position is cooled to the room temperature, the copying clamping sleeve is removed, and welding is completed. According to the welding method for the jack cylinder-barrel accessory, the problem that the dimension of the inner hole of the cylinder barrel is deformed and out of tolerance caused by accessory welding is solved, the whole quality level of products is promoted, and the reject ratio of the products is reduced.

Description

technical field [0001] The invention relates to the technical field of jack manufacturing, in particular to a welding method for cylinder barrel accessories of a jack in which the surface accessories must be tailored and welded after finishing the inner hole of the cylinder barrel. Background technique [0002] It is a common structure to weld the liquid connection seat outside the jack cylinder, through which the power fluid enters the cylinder. Due to the need to withstand the hydraulic pressure of 30-40MPa, the requirements for the weld here are often very high. Usually, a welding seam is welded around the liquid seat to connect it with the cylinder barrel to achieve the sealing effect. Due to the large welding volume and high heat input value of the traditional welding process, after the liquid connection seat and the cylinder are welded, the inner hole of the cylinder often causes obvious deformation and out-of-tolerance. Therefore, the cylinder accessories such as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/053
CPCB23K37/0533
Inventor 李福永印文才卢君刘程张海生刘晟赵俊丽马红尹永霞
Owner ZHENGZHOU COAL MINING MACHINERY GRP
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