CN1003429B - Local expander for long metal pipe - Google Patents
Local expander for long metal pipe Download PDFInfo
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- CN1003429B CN1003429B CN85104746.7A CN85104746A CN1003429B CN 1003429 B CN1003429 B CN 1003429B CN 85104746 A CN85104746 A CN 85104746A CN 1003429 B CN1003429 B CN 1003429B
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- mould
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Abstract
The present invention relates to a device suitable for locally expanding the diameter of a longer metal tube. The device comprises a set of tubular composite moulds, core bars and clamping devices of a radial part, wherein the composite mould is composed of a diameter changing module, a straight section mould and a movable mould. The insertion length of the movable module in the straight section module can be adjusted according to the length of the diameter expanding part. Because the movable module is movably matched with the straight section module, friction force which needs to be overcome in the process of expanding the diameter of a tube towards a diameter expanding cavity in a contraction and sliding mode can be reduced remarkably. In this way, the fluid pressure can also be reduced, and the forming accuracy and the rate of finished products are improved. The present invention is particularly suitable for expanding the diameters of straight tubes and more than two kinds of built-up hoses with large diameter deformation quantity.
Description
Device of the present invention is fit to locally expanded than long metal pipe, is particularly suitable for the locally expanded of thin metallic tubd, for example the guide pipe of nuclear power station use.This pipe has more than one position to need hole enlargement, and the hole enlargement position is shorter in general, can not only to the spacing required precision height between the hole enlargement position, and to the ips tolerance high requirement be arranged also at pipe centre or two ends.
The device of metal pipe material diameter enlarging method and use is known already.Can behind the stopper be placed on the two ends of wanting hole enlargement in the mould beyond the Great Wall, feed the fluid that certain pressure is arranged then, make tube wall deformation press to die wall and realize hole enlargement, it is locally expanded that it is not suitable for long tube.
The U.S.'s 4418556 patent documentations propose a kind of expander of long metal pipe.It is made up of a removable tubulose mould and telescopic binding clasp.Mould by a hole enlargement chamber and be arranged on both sides, hole enlargement chamber about two cylindrical support holes form.A core bar is contained in the metal tube, and core bar has an inner via hole to reach the purpose of hole enlargement in can the high-pressure fluid inlet tube with the outside.Frictional force and the frictional force between pipe and seal of using this device hole enlargement need overcome between pipe and mould just can make pipe successfully finish the hole enlargement distortion to the contraction slip of hole enlargement chamber, this must improve fluid pressure or restriction speed of deformation, causes the wall thickness attenuation of extension diameter section easily and super tolerance or pipe outer wall serious damage are scrapped with breaking.
The pipe end hole enlargement device of reporting in GB1351929 and GB1349456 document is a kind of multiple slidably assembling die.Pressure source directly feeds tube cavity, and pipe shrinks along its length in pressurized hole enlargement process and drives the combination sliding mould and moves.This mould is not suitable for the hole enlargement of long tube any part, otherwise will strengthen device length according to tube length, the difficulty that this obviously can improve producing cost and increase processing.A kind of hole enlargement specification of this kind device one a cover mould moulding, the mould structure complexity has long high-voltage oil cavity, in the hole enlargement process, mould and piston all will with respect to annular lug move and also seal point many.
Purpose of the present invention will design and propose a kind of local expander of long metal pipe, in the hole enlargement process, can significantly reduce the frictional force of mould and pipe way, pipe is slided toward the hole enlargement district easily when hole enlargement, needed fluid pressure when reducing hole enlargement, improve formed precision, guarantee pipe etc. wall thickness, improve speed of deformation, improve yield rate.
Another object of the present invention is to design and to propose a kind of local expander of long metal pipe, is fit to the hole enlargement of moderate finite deformation amount.
The 3rd purpose of the present invention is the local expander that will propose a kind of simple in structure, easy to operate, long metal pipe that cost is low.
The 4th purpose of the present invention is to design a kind of expander, can adjust the length in hole enlargement district within the specific limits arbitrarily.
Expander of the present invention comprises the tubulose combination die that overlaps subdivision radially, core bar and a cover binding clasp.The tubulose combination die is made up of reducing mould, straight section mould and mobile mould.The reducing mould comprises a left side (or right) supported hole and a left side (or right) reducing district.The internal diameter of supported hole is a bit larger tham the original outer diameter of pipe, and the size of the larger diameter end in reducing district equals and/or less than the diameter in straight section district.Straight section mould has cylindrical bore as the straight section district in hole enlargement chamber and the insertion district of mobile mould, and its internal diameter is a bit larger tham the external diameter after the pipe hole enlargement, and its end matches with the larger diameter end of reducing mould.Mobile mould comprises the right side (or left side) supported hole and the right side (or left side) reducing district, and its partial-length is to insert in the straight section mould movingly.Make the reducing district of mobile mould, the straight section district of straight section mould and the reducing district of reducing mould constitute required hole enlargement chamber.Regulate mobile mould and insert the interior length of straight section mould, can obtain different hole enlargement section length.The endoporus of reducing mould, straight section mould and mobile mould is concentric.The diameter of core bar is slightly smaller than the original internal diameter of pipe, and length is short selected according to the hole enlargement head of district.Core bar has an inner via hole, and through hole is made up of the horizontal component and the vertical component that are communicated with.One end and the external pressure source of horizontal through hole link, and an end of vertical through hole communicates with annular space between core bar and the pipe, and pressure fluid is introduced this annular space.There is the cannelure of dress seal the both sides of core bar, and groove is positioned at the outside in reducing district.In order to reach the better seal effect, every side preferably has two cannelures.
The binding clasp position changeable that employing is made up of upper holder block, clamp, V-type rail and screw, degree of tightness is adjustable, and mounting or dismounting are convenient, shorten the operating time, are fit to produce in batches.
In the expander of the present invention, owing to adopted the combination die that mobile mould is arranged, can reduce when hole enlargement pipe significantly to the hole enlargement district required frictional force that overcomes of sliding.Pipe is when hole enlargement, and when especially hole enlargement amount was big, it is also bigger that pipe shrinks amount of movement to the hole enlargement district.Shrink the mobile frictional force that must overcome simultaneously between seal and tube wall and mould inwall and the tube outer wall inwards with fixed mould pipe.And the tube outer wall in the assembling die of Tape movement mould is relative static with mobile intermode, between mobile mould and the straight section mould again for movingly, frictional force is very little therebetween, can ignore, so need only overcome frictional force between seal and tube wall, thereby can improve speed of deformation, reduce briquetting pressure, avoid replenishing the phenomenon that deficiency causes pipe break because of moving untimely pipe, guarantee formed precision, can be fit to the hole enlargement processing of moderate finite deformation amount.Percentage elongation is 25-30%, and tensile strength is 47-50kg/mm
2The maximum hole enlargement amount of metal pipe material can reach 10-12mm.With the Zr compo pipe is that example can expand the pipe of Φ 10mm the 20mm to Φ smoothly.
Another advantage of expander of the present invention is that one pair of mould can be used for expanding the pipe of different hole enlargement section length.The insertion length of adjusting in the mobile mould can be conveniently implemented in the hole enlargement of different length in 10～500mm scope, and can carry out hole enlargement on any part of long tube.
Expander of the present invention is simple in structure, and is easy to operate, and cost is low, adopts the binding clasp of upper holder block formula to install and remove especially conveniently, shortens the time of changing pipe, is fit to produce in batches.
Expander of the present invention is specially adapted to the moulding of nuclear power station Zr compo pipe, also can be used for Cu and Cu alloy, Ti and Ti alloy, stainless steel and soft attitude Nb, Ta alloy or other metal or alloy pipes.
By following accompanying drawing, can understand the characteristics of apparatus of the present invention better.
Fig. 1 is the profile of the assembly of assembling die and core bar in apparatus of the present invention.
Fig. 2 is the assembling die of apparatus of the present invention and the installation diagram of binding clasp.
Be to explain inventive embodiment with reference to the accompanying drawings below.
One. the diameter changing device of the straight pipe of a kind of metal is as shown in Figure 1.Assembling die comprises reducing mould (1), straight section mould (2), mobile mould (3).Mobile mould partly inserts in the straight section mould, and the reducing district (9) in the reducing mould, the straight section district (11) in the straight section mould and the reducing district (10) in the mobile mould constitute diameter-changing cavity (14).Core bar (4) inserts the position that pipe (6) is wanted hole enlargement.Be arranged on the O type seal (5) of core bar grooves on two sides (15), (16), supported hole (12) that (24) lay respectively at reducing mould and mobile mould, (13), define the annular space of core bar and pipe way.Both mold ends is tightened up with binding clasp by relative position shown in Figure 2, binding clasp comprises upper holder block (17), clamp (19), V-type rail (20) and screw (18).Pressure fluid is introduced annular space from an end (21) of the horizontal through hole (8) of core bar through the end of vertical through hole (7), and tube wall is pressed to hole enlargement chamber wall and finished the hole enlargement operation.Φ 16 * 0.4mm is arrived in the hole enlargement on 30mm length of the Zr compo pipe of a kind of Φ 12 * 0.4mm, requirement.When utilizing this device hole enlargement moulding, working pressure is 500kg/cm
2, and the fixed mould of US4418556 report is 800kg/cm with the pipe hole enlargement of Φ 11mm to the pressure that Φ 13mm uses
2About.The hole enlargement of more than 40 Zr compo pipe shows, the pipe fracture phenomena does not take place, and harmless ultrasonic inspection is qualified, and the ips tolerance is less than ± 0.03mm after the hole enlargement.
Two. make the same sampling device of use-case one, mobile mould is fixed on the certain position, Φ 16 * 0.4 * 200mm is arrived in the Zr compo pipe hole enlargement of a kind of Φ 12 * 0.4mm, can obtain same effect.
Claims (1)
1, a kind ofly be used for long metal circular tube local expander, it comprises the radially tubular mold of subdivision, core bar and binding clasp, tubular mold by hole enlargement chamber (14) and be arranged on two ends, hole enlargement chamber about two cylindrical hole supporting sections (12) (13) form, two reducing districts (9) (10) and a straight section district (11) about the hole enlargement chamber has, the internal diameter in straight section district is a bit larger tham the external diameter after the pipe hole enlargement, the internal diameter of cylindrical hole supporting section is slightly larger than the original outer diameter of pipe, core bar (4) has an inner via hole, this through hole is made up of horizontal component and vertical component, one end (21) of horizontal through hole links to each other with the external pressure source, one end of vertical through hole (7) communicates with annular space between core bar (4) and the pipe (6), and pressure fluid introduced this annular space, the external diameter of core bar is less than the original internal diameter of pipe, there is the annular groove (15) (16) of dress seal the both sides of core bar, the outside feature of the present invention that groove lays respectively at reducing district (9) (10) is that said tubular mold is a combination die, by reducing mould (1), straight section mould (2) and mobile mould (3) three parts are formed, and said reducing mould comprises a left side (or right) supporting section (12) and a left side (or right) reducing district (9); Said straight section mould has cylindrical bore, as the straight section district in hole enlargement chamber and the insertion district of mobile mould; Said mobile mould comprises the right side (or left side) supporting section (13) and the right side (or left side) reducing district (10), one end of straight section mould matches with the reducing mould, the other end is to be enclosed within movingly outside the mobile mould, make the reducing district (10) of mobile mould, the straight section district (11) of straight section mould and the reducing district (9) of reducing mould, constitute required hole enlargement chamber (14), regulate the insertion length of mobile mould in straight section mould, can obtain the hole enlargement chamber of different length.Said binding clasp is made up of upper holder block (17), clamp (19), v type guide rail (20) and screw (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104746.7A CN1003429B (en) | 1985-06-21 | 1985-06-21 | Local expander for long metal pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104746.7A CN1003429B (en) | 1985-06-21 | 1985-06-21 | Local expander for long metal pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104746A CN85104746A (en) | 1986-12-17 |
| CN1003429B true CN1003429B (en) | 1989-03-01 |
Family
ID=4794032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104746.7A Expired CN1003429B (en) | 1985-06-21 | 1985-06-21 | Local expander for long metal pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003429B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100489165C (en) * | 2004-06-15 | 2009-05-20 | 沈传良 | Machining mould and method for stainless reeling silk bobbin |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1088634C (en) * | 1998-10-28 | 2002-08-07 | 辽源市重型机器厂 | Vehicle rear axle shell hydraulic expanding-forming process |
| WO2009014233A1 (en) * | 2007-07-20 | 2009-01-29 | Nippon Steel Corporation | Hydroforming method, and hydroformed parts |
| CN104227321A (en) * | 2014-07-18 | 2014-12-24 | 四川银钢一通凸轮科技股份有限公司 | Tensioning tool, assembling equipment and camshaft assembling method |
| DE102019103926A1 (en) * | 2019-02-15 | 2020-08-20 | Walter Henrich GmbH | Method and device for the axial forming of a pipe |
| CN110174066B (en) * | 2019-04-22 | 2021-06-22 | 陕西法士特齿轮有限责任公司 | Checking tool for distance from sharp groove on shaft to shaft end face, machining method and checking method of distance |
| CN112475046B (en) * | 2020-11-23 | 2022-04-19 | 重庆市华青汽车配件有限公司 | Flaring die in duplex position |
-
1985
- 1985-06-21 CN CN85104746.7A patent/CN1003429B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100489165C (en) * | 2004-06-15 | 2009-05-20 | 沈传良 | Machining mould and method for stainless reeling silk bobbin |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104746A (en) | 1986-12-17 |
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