CN1067303C - Shrinking method - Google Patents

Abstract

A method for shrinking a ring (14) is disclosed. The free end (10a) of a flexible tube (10) linking between the ring (14) and a rigid tubular member (12). The method uses a shrinking die (16) with an axial cavity (18) including a splayed section (18a) with a broad open end (20) whereat the diameter of the cavity is substantially the same as the greatest diameter (d) of said section. The shrinking die (16) is positioned so that at least the broad end of the cavity is located around the portion (14) to be shrunk while its narrow end is in front of the tube, and, while axially supporting one of the ring (14) and the shrinking die (16), both are mutually axially moved in a direction extending from the free end (10a) of the tube (10) towards the other end thereof.

Description

The undergauge method

As everyone knows, for example, the flexible hose free end can be tightened with an annulus and a rigid tubular member for making coupling arrangement have the rigid tubular end piece, arranged coaxial, annulus is in the flexible pipe outside, and rigid tubular member is in its inside.

For reaching this purpose, just must implement the undergauge operation, to dwindle circle diameter.

Put it briefly, the present invention relates to a kind of undergauge annulus method, this annulus is engaged on the flexible hose free end, and this flexible pipe is engaged on the rigid tubular member, described annulus to have at least can undergauge section, its diameter is greater than hose diameter originally.

The method is to use the reducing die of a tape spool to die cavity, it comprises an oared segrne pii, open from first end to second end, this die cavity has a uncovered big end, the diameter of die cavity described herein in fact with the equal diameters of the described oared segrne pii at the second end place.

Axially undergauge generally is used to do the scattered work of rigidity pipe fitting.

United States Patent (USP) 2314002 has been recorded and narrated a kind of method, attempts to utilize axial undergauge, and reducing die is engaged in the annulus on the flexible hose free end.

In the method, reducing die is to be enclosed within on this mould originally, and after annulus move to hose free end.

Because will be enclosed within reducing die on the flexible pipe, so axial die cavity minimum diameter is not less than the overall diameter of flexible pipe.Because annulus itself is enclosed within on the flexible pipe, so its interior diameter also is not less than this flexible pipe overall diameter.Therefore, when undergauge, the actual reduction volume of diameter must not be greater than the thickness of annulus.

Therefore, diameter reduction is emitted a little risks always, does not promptly have fully to hold and guarantees to be fitted together securely by the device that flexible pipe, annulus and tubular element constitute.

Improve the undergauge degree, even also the unique method that further dwindles of diameter improves annulus thickness exactly, the raising that this just must bring fee of material makes the energy requirement raising of undergauge institute.

Everybody knows that also radially undergauge can carry out with a kind of undergauge instrument.This instrument has many angled fan sections (angular sectors), can move mutually, and this method is not too satisfactory, damage occurs because of it can make the undergauge appearance.Vertical fold appears because the radial fissure between the angle fan section, this damage may seriously arrive.This damage can increase the crush injury that flexible pipe occurs, and destroys sealing.

The present invention attempts to overcome these shortcomings.

This purpose is by following true the realization, promptly placing the reducing die method is, at least be that the big end of die cavity will encase the undergauge section, the first end of described die cavity oared segrne pii will exceed the flexible pipe scope in the front of hose free end, when axially blocking one of these two parts of annulus and reducing die, between described two members, move to axial to doing towards the rear, promptly move to the other end that is considered as flexible pipe " back " end from the free end that is considered as flexible pipe " preceding " end.

By these configurations, undergauge also not only is confined to the thickness of annulus.In addition, by moving backward,, just may obviously improve the mechanical strength of the device of forming by flexible pipe, annulus and tubular element owing to the reason of hose material (generally comprising rubber) shown characteristics when the undergauge operation.

Some hose material is just pushed ahead when undergauge, that is material is forced to wriggling, and is to be benchmark with the flexible pipe, advances along the reducing die direction of displacement.If this displacement is moving to hose free end, the material of pushing ahead so just tends to assemble to described free end.When not having vacant lot in the annulus, surfacing just is easy to wriggle round about, and consequently whole wriggling all is to wriggle backward, that is wriggling is to be benchmark with the annulus, towards carrying out with reducing die displacement rightabout.

By chance, the thickness of the flexible hose that rubber type of material is made obviously becomes with the function of manufacturing parameter, so that the size of the margin of tolerance may be about 1 millimeter, because thickness generation localized variation, the volume of excess stock, that is, the volume of the material that wriggling will be pushed open in the part, too can significant change, consequently, great changes will take place local for the pressure of the hose material in the annulus, for making annulus can bear these variations, and don't as for distortion, the tension intensity that connects between assurance flexible pipe, annulus and the tubular element, the thickness of annulus just must be quite big so.

In addition, when displacement when hose free end is moving, the flexible pipe constituent material also will bear huge pressure and change when being forced to wriggle, this will have influence on mechanical performance.

By this invention, when undergauge was carried out in the position backward, the pressure that acts on hose free end was uniformly distributed in its whole periphery, so that any position of flexible pipe can not crushed suddenly or squeeze bad.

In addition, because undergauge begins to carry out gradually from hose free end in the axial direction, the flexible pipe constituent material will be wriggled gradually so, and this can not damage flexible pipe, and helps to keep the airtight quality of this matching requirements especially.

Undergauge is equably, little by little carry out, so just can be annulus and flexible pipe safety, be assembled together reliably, material aggregation appears in the pipe end that does not cause flexible pipe crush injury to occur or block mutually between annulus and rigid tubular member, especially the weak spot district can not appear at the petiolarea away from the free-ended annulus of pipe, even use quite thin annulus, also can guarantee reliable connection.

Favourable a kind of situation is, the moving to axial of annulus and reducing die stopped before the first terminal end that arrives away from section hose free end, will undergauge of oared segrne pii.

Like this, the horn mouth at annulus rear portion opens a little, thereby has avoided the danger of damage flexible pipe.Reliability and durability for guaranteeing hookup, will carry out the long duration test that intensity improves constantly to it.One of test is exactly to make the relative annulus vibration of flexible pipe.The annulus rear portion is this fact of horn mouth formula, is cut off even flexible pipe is impaired when making it avoid doing experiment.

As long as have a look the following detailed description of non-limiting example, just can good understanding be arranged to the present invention, its advantage also will be more apparent.Illustrate to relate to accompanying drawing, wherein:

Fig. 1 is a sectional side elevation, the annulus that is engaged on the flexible hose free end is shown, and flexible pipe itself is engaged on the rigid tubular member, it also shows a reducing die, and first kind of embodiment of method therefor of the present invention just will be implemented with this mould.

Fig. 2 and Fig. 3 express the beginning and the ending of the inventive method respectively.

Fig. 4 is a view similar to Fig. 1, and visible another embodiment of the invention will be used among the figure.

Fig. 5 represents the performance of this method.

Fig. 1 illustrates flexible hose 10, and its free end 10a is bonded on the rigid tubular member 12, and cylindrical shape annulus 14 then is bonded on the free end 10a.

For simplifying following explanation, suppose that end 10a is the front end of flexible hose 10, because these figure are brachymemma figure, an end of the back in other words that it is far away is then not shown.

Annulus 14 shown in Fig. 1 is the situations before the undergauge.Its diameter D is greater than the diameter of flexible pipe 10.

Fig. 1 also illustrates the reducing die 16 that has axial die cavity 18.This die cavity has an oared segrne pii 18a, this oared segrne pii 18a is the former first end 19a of d ' to diameter from diameter is that the second end 19b of d opens, diameter d is greater than diameter D, and diameter D itself is greater than diameter d ', the die cavity that joins with loudspeaker section first end 19a comprises that diameter is the cylindrical sections 18b of d ', and this section external-open is gone into narrow open end 17.At the other end, die cavity has a very big openend, and in the example shown, the second end 19b of it and conical butt loudspeaker section coincides.

Various different components before Fig. 1 illustrates the undergauge operation and is about to begin, its position are, the longitudinal axis of die cavity axis and flexible hose is in alignment, and openend 20 opens backward greatly.

Fig. 1 also illustrates the instrument 22 that blocks annulus 14 vertically.And the rear end 14b of annulus abuts against with it.Fig. 1 this instrument that only schematically draws.This instrument can have two catch jackets on flexible pipe, matches with the free end 14b of annulus 14, so that be fixed in due position during undergauge.

Wanting to place so earlier reducing die, promptly is that the big end 20 of die cavity is enclosed within around the annulus of wanting undergauge at least, and before the first end 19a will be placed on annulus, the front end above flexible pipe just began the undergauge operation then.In other words, be exactly that reducing die will be aimed at the undergauge annulus by arrow F direction and configure, that is 10a moves to its rear end from the flexible pipe front end, or the end 20 that will move die cavity at least reach the front end 14a of annulus.

When the die cavity wall began to match with the annulus neighboring, formal undergauge promptly began.

When carrying out undergauge, as shown in Figures 2 and 3, reducing die 16 is pressed arrow F direction, that is backward, move axially on the annulus 14.

Certainly, implementing thisly when mobile, because annulus is by chucking instrument 22 fix in position, its overall diameter is narrowed down to the minor diameter d ' of die cavity 18 gradually.When carrying out this operation, creep just takes place in flexible hose end 10a gradually.

When undergauge finishes, structural form shown in Figure 3 occurs, wherein annulus 14 is crimped on the hose end 10a, and flexible pipe then is clamped between rigid tubular member 12 and the annulus 14.

As what seen on this figure, the situation after this illustrates undergauge and finishes preferably before the minor diameter of the oared segrne pii 18a of die cavity moves on to rear end 14b away from the flexible pipe 14 of the free end 10a of flexible pipe 10, stops to move axially of reducing die 16 relative annulus 14.Therefore, just a bit open as horn-like the rear section of annulus, and this has not just had the danger of damage flexible pipe.

In addition, can see on these figure that tubular element 12 is radially expanded portion 13 near himself rear end.Preferably before the complete undergauge of annulus is to the bulge, just finish undergauge.This has just guaranteed the reliable connection between the hookup member, and has avoided flexible pipe to be damaged by pressure by the part at bulge simultaneously, otherwise can damage the mechanical performance of flexible pipe.

As long as undergauge one is finished, just, annulus is removed from reducing die, and it is just passable to remove chucking instrument 22 by moving reducing die to arrow F rightabout.

In Fig. 1 to Fig. 3, cylindrical shape annulus 14 total lengths in some cases, as shown in Figure 4 and Figure 5, it would be desirable the only part of undergauge annulus basically all by undergauge.On these figure, all be marked with same numeral with the similar member of Fig. 1 to Fig. 3 and add 100.

Annulus 114 has not first a section 115a of undergauge, shown in legend, this section 115a stretches forward, the front end 110a that surpasses flexible hose 110, and can be used as the shell of sealing ring 117, it has the fixedly member used of rigid tubular end piece in other words, and also we are desirable just above the end piece and flexible pipe 110 is connected to this.

Therefore, have only the rear end 115b of annulus 114 to need undergauge section 115a to constitute an axial obstacle, it makes it possible to use single-piece reducing die 16 under the described condition referring to figs. 1 to Fig. 3.Therefore, just used the reducing die of forming by two half module 116a and 116b 116.

For this reducing die is enclosed within on the annulus, shell 116a and 116b are left mutually, so that reserve a passage, its size will be enough to annulus is passed through, and or rather, is that its front section 115a is passed through.When two shells are incorporated into together, encase annulus, to remove after the described passage, reducing die moves by F arrow direction, at this moment just formally begins axial undergauge.

In case two shells according to said method are assembled together, and just form die cavity 118, it has an oared segrne pii 118a and the cylindrical section 118b that diameter is less.

Small end 121 away from the big end 120 of die cavity is openings.Seen as Fig. 5, this just can make reducing die 116 that section 115b is impaled, and implements undergauge, and the first section 115a that reserves annulus 114 simultaneously stretches out reducing die forward.

The undergauge of section 115b is by moving by arrow F direction, that is makes it to begin to move to from the undergauge that dots that the undergauge end that represents with solid line finishes.In the whole process that die cavity moves, annulus is axially blocked by chucking instrument 122.In Fig. 4 and example shown in Figure 5, instrument 122 has claw, can match with the front end of annulus 114, or rather, the claw of instrument 122 just is trapped among around the annulus that is right after first section, 115 back, and engages with shoulder 114 ', so that block annulus, move backward when preventing its undergauge and advise.

On Fig. 4, can see, the arbitrary diameter of the second section 115b of the first section 115a back that is positioned at annulus before undergauge all greater than the diameter of annulus after dwindling through undergauge.This point is particularly suited for the front end region 115c near the 115b section of the first section 115a back.Therefore, close mutually around annulus 114 when shell, before moving axially reducing die, distinguish 115c at this, implement the radially preliminary step of undergauge, its size accounts for a very little part of wanting the reducing diameter part bit length.

Preferably as shown in Figure 4 and Figure 5, implement radially that the regional 115c of undergauge preliminary step stretches forward, surpass the front end 110a of flexible hose, the shortcoming relevant with undergauge radially is unlikely to exert an influence to flexible pipe so that make.

The diameter of centre portion 115c also might just be less than or equal to the undergauge diameter originally, in this case, just needn't implement radially undergauge step in advance.

Though annulus is axially blocked, reducing die moves by the direction shown in the arrow F as the example shown in scheming to go up, and it should be understood that equally and might move annulus by arrow F rightabout by axially blocking reducing die, implements undergauge.The important point is that two members that are made of annulus and reducing die produce displacement each other, make reducing die press arrow F direction, that is move along undergauge backward.

Claims (7)

1. undergauge annulus (14,114) method, this annulus is engaged in flexible hose (10,110) free end (10a, 110a), and flexible pipe itself is engaged in rigid tubular member (12,112) on, described annulus has a section (14 of wanting undergauge at least, 115b), its diameter (D) is greater than hose diameter, this method adopts a reducing die (16,116), this reducing die has axial die cavity (18,118), this die cavity comprises an oared segrne pii (18a, 118a), open to the second end (19b) from first end (19a), this die cavity has a big open end (20 at its second end, 120), the as many as described oared segrne pii diameter of described die cavity diameter (d) herein

It is characterized in that: reducing die (16,116) is in this way to place: be that the big open end (20,120) of die cavity (18,118) contains will be by the section of undergauge (14,115b) at least, and the oared segrne pii (18a of described die cavity, first end 118a) will be at hose free end (10a, front 110a) exceeds flexible pipe (10,110), and

When axial chucking annulus (14,114) and during one of two members formed of reducing die (16,116), axially relatively move along backward directions (F) between described two members, from being considered as flexible pipe (10, (10a 110a) moves to the other end that is considered as " back " end the free end of " preceding " end 110).

2. the method for claim 1, it is characterized in that: at oared segrne pii (18a, first end 118a) (19a) arrives the section (14 of wanting undergauge, 115b), away from flexible pipe (10,110) free end (10a, end (14b 110a), 114b) before, stop to move to axial of annulus (14,114) and reducing die (16,116).

3. method as claimed in claim 1 or 2 is characterized in that: annulus (14,114) axial restraint, reducing die (16,116) want the section of undergauge (14, move axially on 115b).

4. the method for claim 1, it is characterized in that: described reducing die (116) comprises two half module (116a, 116b), for reducing die (116) is installed on the annulus, and half module (116a, 116b) separated from each other, form a passage, its size is enough to make annulus (114) to pass through, and described half module moves to around the described annulus in opposite directions, eliminates until passage.

5. method as claimed in claim 2, it is characterized in that: described reducing die (116) comprises two half module (116a, 116b), for reducing die (116) is installed on the annulus, and half module (116a, 116b) separated from each other, form a passage, its size is enough to make annulus (114) to pass through, and described half module moves to around the described annulus in opposite directions, eliminates until passage.

6. method as claimed in claim 3, it is characterized in that: described reducing die (116) comprises two half module (116a, 116b), for reducing die (116) is installed on the annulus, and half module (116a, 116b) separated from each other, form a passage, its size is enough to make annulus (114) to pass through, and described half module moves to around the described annulus in opposite directions, eliminates until passage.

7. as each described method of claim 4-6, it is characterized in that: when half module (116a, 116b) centers on annulus (114) when moving towards each other, end regions (115c) at section (115b) that will undergauge is implemented in advance radially undergauge step earlier, this zone is a short section of described section (115b) near the free end (110a) of flexible pipe (110).