CN101972915A

CN101972915A - Method for preparing corrosion-resistant non-ferrous metal pipeline

Info

Publication number: CN101972915A
Application number: CN 201010245168
Authority: CN
Inventors: 王建平; 董宝才; 王耀峰; 杜永勤; 唐支翔; 乔迎才
Original assignee: NANJING BAOSE CO Ltd
Current assignee: NANJING BAOSE CO Ltd
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2011-02-16
Anticipated expiration: 2030-08-04
Also published as: CN101972915B

Abstract

The invention discloses a method for preparing a corrosion-resistant non-ferrous metal pipeline, which comprises the steps of: preforming, sticking and shaping, and welding a longitudinal seam. By the method, a large-diameter rare non-ferrous metal pipeline can be manufactured, the molding effect is good and the molding efficiency is high.

Description

The preparation method of a kind of anti-corrosion non-ferrous metal material pipeline moulding

Technical field

The present invention relates to chemical industry, medicine, petrochemical industry anticorrosion with pipeline engineering and anti-corrosion pressure vessel with fields such as pipelines, be specifically related to anti-corrosion extraordinary non-ferrous metal material pipeline molding method for preparing such as a kind of titanium, nickel, zirconium.

Background technology

In deep-etching in chemical industry, medicine production and the special electrochemical corrosion environment, need to use special material pipeline and pipe fittings such as titanium, nickel, and present pipe production technology, handle larger-diameter when the seam welding pipe is arranged, mainly based on carbon steel material, the tubulation form is based on strip spiral charging moulding weldering and plate coiled material charging longitudinal joint moulding weldering automatically automatically, and the stainless steel pipeline is mainly based on the weldering automatically continuously of seamless stone roller system, cold-drawn and the differential of the arc.

Because titanium; the metal material price of being able to bear strong corrosion such as nickel compares carbon steel; stainless steel costliness many; and weldering system process has also required the inert gas environment protection; therefore than major diameter; as more than the DN 150-300 to the special material pipeline of this rare non-ferrous metal of DN 1000mm; present domestic also the do not have more regular production line form and the combination of technology pattern; substantially be in manual operations; the punching press of the auxiliary short section of hydraulic press; or vertical many ribs of the trace curved surface forming half arc voltage system of bender; the segmentation circumferential weld continues during assembly welding; longitudinal joint zigzag weld; not only efficient is low, and the moulding tubular distortion that continues when being 3 meters and even 6-9 rice length is not straight; it is not good enough that outward appearance is felt.

Summary of the invention

Technical problem to be solved by this invention is: special non-ferrous metal welded pipe road moulding process efficient such as existing larger-diameter titanium, nickel are low, the finished product cast is not straight.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the preparation method of a kind of anti-corrosion non-ferrous metal material pipeline moulding may further comprise the steps: 1) preformed: the load such as sheet material that adopt the triple axle major axis that sanction is cut are bent and are rolled; Described triple axle major axis comprises a pressure roll and two carrying rollers, and pressure roll is positioned at two carrying roller center upper portion; Sheet material is placed between pressure roll and the carrying roller, and carrying roller rolls power is provided, and pressure roll provides pressure, makes the tangent even rolling of sheet material negative camber round surface outside pressure roll, reaches crooked preformed; 2) buckling die shaping: by the buckling die frock with preformed sheet material by entad driving pressure outward, making crooked sheet material joint close is the pipeline of standard cylindrical curvature size, and fixes in commissure spot welding; Described buckling die frock is divided upper die and lower die; 3) welding longitudinal joint: the pipeline after the buckling die shaping is put into the grooved weldering bar of automatic welder(welding machine), described automatic welder(welding machine) also comprise track and with vertically disposed two carriages of track; Two carriage horizontal support pipelines also carry pipeline weight, establish the gas shield box in the grooved weldering bar, and the longitudinal joint that the gas shield box is close to pipeline moves the enforcement welding protection at random.

Adopt existing triple axle major axis to carry out pipeline preformed, can guarantee preferably that the sheet material that noble metal such as titanium makes is evenly stressed in pressing process, preformed sheet material curved surface flexibility is consistent, for follow-up buckling die shaping provides good conditions; The buckling die frock of existing upper and lower mould fit structure is adopted in the buckling die shaping, and it adapts to diameter specifications from DN 150-1000mm; Adopt existing automatic welder(welding machine) during the welding longitudinal joint, solved the problem that needs inert gas shielding when titanium, nickel etc. are able to bear strong corrosion Metal Material Welding, and the carriage that is provided with on its track can effectively be avoided the stressed flexural deformation of flute profile weldering bar.

For making pipe ends smooth, also carry out following steps after the welding longitudinal joint finishes: the smooth cutting of end face, promptly smooth cutting is carried out at pipeline two of finishing of butt welding system.

For guaranteeing the quality of pipeline finished product, after finishing, the smooth cutting of end face also is carried out to the pipe leak detection, by the hydraulic test of pipeline device pipe is carried out water pressure test leak detection after promptly pipeline is made and finished.

As a kind of improvement project of the present invention, the smooth cutting of end face adopts chamfering machine to cut.

As another kind of improvement project of the present invention, the interior dress of described buckling die frock die shoe is stacked fixing, and buckling die frock vertically district is respectively pre-plastic section, excessive section, curved surface joint close section.

Advantage of the present invention is: can make the pipeline of large diameter rare nonferrous materials, and good forming effect, the shaping efficiency height.

Description of drawings

Fig. 1 is the structural representation of triple axle major axis of the present invention;

Fig. 2 is the structural representation of buckling die frock of the present invention;

Fig. 3 is the cutaway view of Fig. 2 along the A-A face;

Fig. 4 is the structural representation of automatic welder(welding machine) of the present invention.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, the titanium plate 1 that sanction is cut places between pressure roll 2 and the holder axle 3, after the pre-press-bending in titanium plate 1 plate face limit, by the friction rolling power that produces between sheet material and the roll shaft, two carrying rollers 3 drive titanium tangent even rolling of plate 1 negative camber round surface along pressure roll 2 outside and crooked preformed under the two-sided extruding of pressure roll 2 and holder spools 3 under the oil motor power drive.

As shown in Figures 2 and 3, the buckling die frock is divided patrix 4, counterdie 5, adapt to the sheet material of diameter specifications from DN 150-1000mm, the buckling die frock vertically is divided into the excessive section of the pre-plastic section 9-10-curved surface joint close section 11 that radius reduces successively, divide three sections shapings in elasticity and inferior plastic range by outside entad drive pressure, forcing the bent plate joint close is the pipeline of standard cylindrical curvature size, and spot welding is fixed-type.

As shown in Figure 4; with the semi-finished product after the buckling die shaping pack into the weldering bar 6; two carriages 7 on the track 8 support, carry pipeline weight with pipe level; avoiding length is 9.5m; diameter is 120mm, and wall thickness is the weldering bar 6 stressed flexural deformations of 7mm, establishes the gas shield box in the grooved weldering bar 6; the longitudinal joint that the gas shield box is close to pipe moves back and forth, and implements welding protection.

After pipeline welding finishes, be placed on the chamfering machine table top, smooth cutting is carried out at pipe end two, obtain finished product.This finished product carries out water pressure test leak detection by the hydraulic test of pipeline device to pipe, the pipeline of variant diameter specifications, hydraulic test pressure grade, and the leak test that 0.4--1.6MPa is in the difference requirement of using by dispatching from the factory respectively can use sale after the assay was approved.

Claims

1. the preparation method of anti-corrosion non-ferrous metal material pipeline moulding is characterized in that may further comprise the steps:

1) preformed: the load such as sheet material that adopt the triple axle major axis that sanction is cut are bent and are rolled; Described triple axle major axis comprises a pressure roll and two carrying rollers, and pressure roll is positioned at two carrying roller center upper portion; Sheet material is placed between pressure roll and the carrying roller, and carrying roller rolls power is provided, and pressure roll provides pressure, makes the tangent even rolling of sheet material negative camber round surface outside pressure roll, reaches crooked preformed;

2) buckling die shaping: by the buckling die frock with preformed sheet material by entad driving pressure outward, making crooked sheet material joint close is the pipeline of standard cylindrical curvature size, and fixes in commissure spot welding; Described buckling die frock is divided upper die and lower die;

3) welding longitudinal joint: the pipeline after the buckling die shaping is put into the grooved weldering bar of automatic welder(welding machine), described automatic welder(welding machine) also comprise track and with vertically disposed two carriages of track; Two carriage horizontal support pipelines also carry pipeline weight, establish the gas shield box in the grooved weldering bar, and the longitudinal joint that the gas shield box is close to pipeline moves the enforcement welding protection at random.

2. the preparation method of anti-corrosion non-ferrous metal material pipeline according to claim 1 moulding, also carry out following steps after it is characterized in that welding longitudinal joint and finishing: the smooth cutting of end face, promptly smooth cutting is carried out at pipeline two of finishing of butt welding system.

3. the preparation method of anti-corrosion non-ferrous metal material pipeline according to claim 2 moulding is characterized in that: also be carried out to the pipe leak detection after the smooth cutting of end face finishes, by the hydraulic test of pipeline device pipe carried out water pressure test leak detection after promptly pipeline is made and finished.

4. the preparation method of anti-corrosion non-ferrous metal material pipeline according to claim 2 moulding is characterized in that: the smooth cutting of end face adopts chamfering machine to cut.

5. the preparation method of anti-corrosion non-ferrous metal material pipeline according to claim 1 and 2 moulding is characterized in that: the interior dress of described buckling die frock die shoe is stacked fixing, and buckling die frock vertically district is respectively pre-plastic section, excessive section, curved surface joint close section.