CN1159371A

CN1159371A - Method for making cone-shaped pipe by extrusion

Info

Publication number: CN1159371A
Application number: CN 97100043
Authority: CN
Inventors: 许福林; 强富根
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-05
Filing date: 1997-03-05
Publication date: 1997-09-17
Anticipated expiration: 2017-03-05
Also published as: CN1048433C

Abstract

The present invention discloses a method for manufacturing continuous taper tube by using extrusion forming process. Said method uses a stepped double extrusion forming process, and is implemented by using inner mould and outer mould on one steel tube. Its inner mould is a taper mandrel, and its outer mould is a tapered shaft sleeve. Said invented method uses the centerline of the tube length as boundary, and firstly uses the inner mould to extrude and expand large-bore end of said taper tube, then uses the outer mould to extrude and reduce small-bore end of said taper tube, so that a perfect continuous taper tube can be obtained. Said method is applicable for manufacturing long taper tube whose length is more than 500 mm, and possesses the advantages of simple manufacturing process, high production efficiency and economizing raw material.

Description

A kind of method with making cone-shaped pipe by extrusion

The present invention relates to a kind of machining manufacture of conduit component, be particularly for a kind of method with making cone-shaped pipe by extrusion.Be applicable to that industries such as oil field, engineering, building need reducing to carry the long coning pipe fitting of the pipeline of fluid to use.

In the existing domestic various engineerings, mostly the reducing of conveyance conduit is to realize that by a pipe joint this pipe joint is shorter, two ends diameter difference, and the centre is the jump shape and changes, can be equipped with the steel pipe of various calibers, use commonplace.But when this pipe joint uses, pipe joint need be welded on the steel pipe of different tube diameters and constitute tapered pipeline, assembly manipulation is taken a lot of work bothersome.On-the-spot especially in the open air, the operation assembling is more inconvenient.And the use of this pipe joint is disposable often, is difficult for reusing continuously.A kind of long tapering taper connection pipe fitting is arranged, and the tapering of the big small end of pipe fitting is continuous variation, and a handle that is used to carry by moving also is housed on the outer wall of pipe fitting, and structure is comparatively novel, and it is also convenient to use.This conical pipe fitting at first is a pipe joint, is used for assembling tapered pipeline, is again a segment pipe simultaneously, couples together to constitute tapered pipeline.This pipe fitting is not by welding when assembling, but realizes mechanical connection easily with a special clip on its termination flange, when layout of beam line changes, unclamps clip, and pipe fitting is also reusable, saves trouble, saving of labor, material-saving.Therefore receive publicity in modern project and pay attention to, purposes more and more widely.

The processing and manufacturing of present this long coning pipe fitting mostly adopts hot investment casting to realize, smart cast tube spare equipment investment is big, production efficiency is low, particularly because the restriction of precision casting technology method, and the thicker phenomenon of pipe fitting ubiquity tube wall that essence casts out, tube wall thicken the weight that has not only increased pipe fitting, make the pipe fitting heaviness, and cause the pipe fitting consumptive material to increase, the cost cost improves, satisfying under the prerequisite of using, this obviously is that manufacturer and user are undesirable.Conventional cold extrusion shaped method also can be used to process conical pipe fitting; but under the long situation of pipe fitting; long during extruding owing to stroke; the active force that affacts on the pipe fitting is big; regular meeting makes pipe fitting produce phenomenons such as " pier is thick ", " collapsing "; make pipe fitting distortion, or pipe thickness is changed and cause the processing failure.Utilize the means of coiled strip welding also can process conical pipe fitting, but because equipment investment is big, working (machining) efficiency is low, difficulty is generally adopted by people greatly and not.

The objective of the invention is to disclose the method for the long conical pipe fitting of a kind of convenient, fast, effective processing and manufacturing---the secondary extrusion method of forming that expands, contracts adds section chief's conical pipe fitting, working (machining) efficiency and crudy to improve long conical pipe fitting satisfy the needs in user and market.

Task of the present invention is by the synthetic way of pipe fitting secondary segmenting processing is realized.

Its concrete technical scheme is to adopt the segmentation secondary extrusion method of forming, realizes on a steel pipe with inside and outside mold.The length of steel pipe, wall thickness are identical with the length wall thickness of processed pipe fitting, and the caliber of steel pipe is the caliber at place in the middle of the processed conical pipe fitting.Add man-hour, center line with steel pipe length is the boundary, earlier the upper semisection of steel pipe is expanded the heavy caliber section that is extruded into conical pipe fitting with interior mold, then with outer mold with crowded small-bore section of shortening conical pipe fitting into of the lower semisection of steel pipe, two sections long conical pipe fittings that synthesize a complete and continuous.Get final product welding a handle on the outer wall of pipe fitting after the extrusion modling.

Interior mold among the present invention is that the length of a cone mandrel, mandrel equals half of pipe fitting (steel pipe) length, and the diameter of axle of the front end of mandrel (microcephaly) is identical with the internal diameter of steel pipe, and the diameter of axle of core back-end's (major part) is identical with the internal diameter of conical pipe fitting butt end.Outer mold is equivalent to the axle sleeve of a taper, and the length of axle sleeve is half of pipe fitting (steel pipe) length, and the aperture of axle sleeve front end (heavy caliber end) is identical with the external diameter of steel pipe, and the aperture of the rear end of axle sleeve (small-caliber end) is identical with the external diameter of the thin end of conical pipe fitting.

Adopt the segmentation secondary extrusion method of forming provided by the invention to add section chief's tapering conical pipe fitting, owing to adding man-hour at every turn, the stroke of mold only is half of pipe fitting length, thereby in expansion, the extrusion process that contracts, the active force that pipe fitting is subjected to reduces many than one-shot forming, can not cause pipe fitting the distortion image to occur, guarantee the performance and the quality of pipe fitting.Method provided by the invention is applicable to the long coning pipe fitting of processing length greater than 500mm.

The present invention is owing to adopted the segmentation secondary extrusion method of forming to add section chief's tapering conical pipe fitting, and making extrusion modling add section chief's tapering conical pipe fitting becomes possibility.And it is simple to have process, and equipment investment is few, the production efficiency advantages of higher, and the pipe wall that processes is thin, light weight, cost are low.

Concrete processing method of the present invention is provided by following embodiment in conjunction with the accompanying drawings.

Fig. 1 is for adding the schematic diagram of section chief's conical pipe fitting with method provided by the invention.

Fig. 2 is the structural representation of the long conical pipe fitting of the present invention's processing.

(1) is outer mold among the figure, and (2) are interior mold, and (3) are conical pipe fitting, and (4) are positioning step, and (5) are steel pipe, and (6) are handle.

Below in conjunction with accompanying drawing the present invention is described further.

As figure, the segmentation that the present invention provides, the secondary extrusion method of forming is to adopt inside and outside mold to go up at a steel pipe (5) to realize.Promptly use inside and outside twice extrusion modling of mold segmentation, steel pipe (5) (dotting among the figure) is processed into conical pipe fitting (3).Conical pipe fitting (3) is the long conical pipe fitting of a length L greater than 500mm, demarcates with center line, and a left side is small-bore section for half section, and right half section is the heavy caliber section.The length of steel pipe (5) and wall thickness are identical with length, the wall thickness of conical pipe fitting (3), and the caliber of steel pipe equals the caliber at the middle place of conical pipe fitting.Extrusion modling is finished on hydraulic machine with inside and outside mold.With steel pipe length center line is the boundary, earlier interior mold is contained in the mouth of pipe on the right side half section (upper semisection) of steel pipe, it is squeezed to pressurize, make it become the heavy caliber section of pipe fitting, then outer mold is contained in outside the mouth of pipe on a left side half section (lower semisection) of steel pipe, adding extrusion and contracting, making it become small-bore section of pipe fitting, two sections synthesize a complete continuous long conical pipe fitting.After the machine-shaping, can weld a handle (6) on the outer wall of steel pipe.

Interior mold (2) used among the present invention is the mandrel of a cone, the length L 2 of mandrel equals half (L2=1/2L) of pipe fitting length L, the small end of mandrel (front end) diameter of axle D7 is identical with the inside diameter D 3 at place in the middle of the conical pipe fitting, be D7=D3, the diameter of axle D8 of the big end of mandrel (rear end) is identical with the inside diameter D 4 of conical pipe fitting heavy caliber end, i.e. D8=D4.One location step (4) is arranged, the position when depressing in order to limit mandrel on interior mold (mandrel).Outer mold (1) is a tapered hub, the length L 1 of axle sleeve equals half (L1=1/2L) of pipe fitting length L, the bore D5 of the big end of axle sleeve (front end) is identical with the outer diameter D 2 at place in the middle of the pipe fitting, be D5=D2, the bore D6 of axle sleeve small end (rear end) is identical with the outer diameter D 1 of pipe fitting small-caliber end, i.e. D6=D1.

With the inside and outside mold that present embodiment provides, segmentation secondary extrusion (expand, contract) steel pipe can be easily, efficiently, and machine-shaping goes out the pipe fitting of long taper.And the pipe wall that processes is thin of fine quality, cheap.

Claims

1, a kind of method with making cone-shaped pipe by extrusion, conical pipe fitting is a long conical pipe fitting, pipe fitting length has a handle greater than 500mm on the pipe fitting, it is characterized in that:

A, this processing method are to adopt the segmentation secondary extrusion method of forming, upward realize at a steel pipe (5) with inside and outside mold (2), (1), the length of steel pipe is identical with the length and the wall thickness of processed conical pipe fitting (3) with wall thickness, the caliber of steel pipe equals the caliber at the middle place of processed conical pipe fitting, with steel pipe length center line is the boundary, first half section on the right side (upper semisection) with the squeezed steel pipe of interior mold (2) pressurization, make it become the heavy caliber section of conical pipe fitting, use outer mold (1) to add contract half section on the left side (lower semisection) of steel pipe of extrusion then, make it become small-bore section of conical pipe fitting.

B, interior mold (2) are the mandrel of a cone, the diameter of axle D7 of the small end of mandrel (front end) is identical with the inside diameter D 3 at place in the middle of the conical pipe fitting, big end (rear end) diameter of axle D8 of mandrel is identical with the inside diameter D 4 of the heavy caliber end of conical pipe fitting, and the length L 2 of mandrel equals half of pipe fitting length L.

C, outer mold (1) are tapered hub, the bore D5 of the big end (front end) of axle sleeve is identical with the outer diameter D 2 at place in the middle of the conical pipe fitting, the bore D6 of the small end of axle sleeve (rear end) is identical with the outer diameter D 1 of conical pipe fitting small-caliber end, and the length L 1 of axle sleeve equals half of conical pipe fitting length L.

2, the processing method of conical pipe fitting as claimed in claim 1 is characterized in that a positioning step (4) is arranged on interior mold (2).

3, the processing method of conical pipe fitting as claimed in claim 1 is characterized in that, after the segmentation extrusion modling, is welding a handle (6) on the outer wall of conical pipe fitting.