WO2003039784A1 - Procede et dispositif de dudgeonnage et articulation elastique ainsi dudgeonnee - Google Patents
Procede et dispositif de dudgeonnage et articulation elastique ainsi dudgeonnee Download PDFInfo
- Publication number
- WO2003039784A1 WO2003039784A1 PCT/FR2002/003856 FR0203856W WO03039784A1 WO 2003039784 A1 WO2003039784 A1 WO 2003039784A1 FR 0203856 W FR0203856 W FR 0203856W WO 03039784 A1 WO03039784 A1 WO 03039784A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sectors
- expansion
- internal
- frame
- cone
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/04—Reducing; Closing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
Definitions
- the present invention relates to a method and a device for expanding and an elastic joint thus expanded.
- Such elastic joints are used in particular on motor vehicles.
- an elastic articulation consists of rigid reinforcements (elements of tubes) connected to each other by at least one deformable element (generally an elastomeric sleeve, made of rubber).
- the rigidity of a joint is linked to the choice of the deformable material and its geometry. We already know how to adapt axial and radial rigidities by playing on the dimensions and on the mixtures used of elastomeric materials.
- a conventional expansion consists in passing an axis, or a ball, right through the inner frame of such an elastic joint to increase the diameter, in particular to compensate for the thermal shrinkage of the rubber and to create a state of compression as described above.
- the extension of the internal reinforcement being produced by friction, surface treatments carried out on the internal face of this internal reinforcement are then destroyed.
- such a method only allows for cylindrical shapes due to the crossing from one side to the other. go.
- the nature of the stresses exerted requires either making several passes, or choosing a minimum thickness of the bushing forming the interior frame. Indeed, if this sleeve is too thin, during the passage of the axis or the ball, the sleeve in reaction at its other end supports an axial compression force such that it can cause buckling.
- the known methods are not suitable for the manufacture of large anti-vibration parts, of diameters (before expansion) greater than 40 mm, and preferably greater than 70 mm.
- standard die processes with a long tool pushed through the frame
- They require a press with a very large stroke.
- it is necessary to make several successive passes with different dies.
- the wear of the dies requires replacing them, whereas one wishes not to be forced to such replacement operations and that one wishes to be able to adjust the tooling used. Indeed, the industrial quality cannot be followed or adapted because of these wear or replacements when an adjustment would allow it.
- sectors of a form of expansion are placed inside a frame of an elastic joint to be expanded.
- this form of expansion will be annular, but it is not an obligation.
- the form of expansion is free, i.e. not necessarily cylindrical, or even of circular section.
- the form of expansion can be a polyhedron, regular or not.
- These sectors have an external face intended to bear against the part to be expanded and an internal face intended to receive an expansion device.
- the sectors are separable from each other, and can in particular move together in a movement of radial expansion.
- the expansion device can be a wedge, a cone, or even a ball or an axis as in the prior art introduced into an internal hollow part, preferably circular, of the sectors.
- the peculiarity of the invention then lies in the fact that the expansion tool alone suffers friction and that therefore all the drawbacks mentioned above disappear.
- the form of expansion Before expansion, the form of expansion has an external profile making it possible to engage in the part to be expanded, before expansion.
- the sectors have external radii of curvature adapted to the form of departure or arrival of the parts to be expanded since necessarily the shape of the sectors will be found in the part at the end of the expansion.
- the external shape of the sectors corresponds to the starting profile of the part.
- the radii of curvature of the sectors can be smaller than the radii of curvature of the part once it is expanded.
- the subject of the invention is therefore a method of expanding an elastic joint provided with an internal frame and an elastomeric sleeve, characterized in that it comprises the following steps: - said interior reinforcement is placed around a form of expansion consisting of sectors of expansion which are movable relative to one another, -
- the expansion sectors are separated from one another in order to plastically increase the internal volume of said interior frame.
- the invention also relates to a device for the expansion of such an elastic joint, characterized in that it comprises:
- the invention also relates to an elastic articulation dudgeonnée according to the preceding method, characterized in that the internal volume of the internal reinforcement of said articulation is not cylindrical.
- the invention relates to an elastic articulation dudgeonnée according to the preceding method, characterized in that it comprises an internal and / or external protection by a thin layer of rubber.
- FIG. 1 a sectional view of a device used to implement the method according to the invention in which the annular nature of the embodiment represents only a particular case;
- Figure 1 shows a expansion device according to the invention.
- This device comprises an expansion form 1, here of annular shape, obtained by an assembly of sectors such as 2 to 5, movable with respect to each other.
- Form 1 has an outer profile 6 adapted to receive a part 7 to be expanded.
- the part 7 to be expanded has an inner frame 8 and an outer frame 9 enclosing between them an elastomeric sleeve 10.
- the invention consists in separating the sectors 2 to 5 from each other inside of the inner frame 8, in practical terms this can be achieved by producing in the interior of the sectors 2, according to their profile measured in a plane passing through an axis 23 of the expansion form 1, an inclined draft 11.
- This draft 11, preferably conical is intended to come into contact with 'a cone 12 having a corresponding draft, of the same slope for example.
- the cone 12 is for example lowered by means of a rod 13 in the direction of the shape 1.
- sectors 2 to 5 are joined to each other and are engaged in part 7 by the fact of an insertion tolerance, for example of 5/10 th of a millimeter.
- the part 7 has at the location of this insertion dimensions, or an internal diameter 14 if it is circular, of values less than those that the part 7 will have, at this location, after expansion.
- the cone 12 is then brought into contact with the flanks in relief 11 of all the sectors such as 2 to 5. Then an effort is exerted axially to drive the cone 12 inside the sectors.
- a reaction is applied to a sole 15 of the sectors by means of an anvil 16. Therefore, in no case can any buckling force be manifested. If it appeared, it would not appear in room 7 but in the sectors.
- the sectors such as 2 to 5 have a thickness 17 much greater than the thickness 18 of the frame 8 of the part 7 to be expanded.
- the depression of the cone 12 then causes the separation of the sectors 2 to 5 and correspondingly the increase in the internal dimensions of the part 7 up to values 19, greater than the previous values.
- a plastic deformation is a permanent deformation following a stress, which is opposed to elastic deformation.
- the part 7 may have been placed before the expansion in a structure 20 intended to accommodate it once expanded.
- this part 20 is a beam in which this part 20 is fitted.
- the outer frame 9 can also be constituted by the beam itself. Therefore, the elastomeric sleeve 10 will be compressed as desired.
- each of the sectors could be connected by arms to nuts mounted on a central threaded rod. The rotation of the rod would bring about the separation of the sectors by the tilting of the arms. In these cases, the sectors could have a side 11 of any profile.
- An advantage of the process of the invention is the fact of allowing the swaging practically without friction, in any case under friction conditions much less severe for the surface of the reinforcements than in the conventional swaging processes. It is then possible to replace these metallic surface treatments with a thin layer of elastomer whose effectiveness against corrosion is well known but whose mechanical strength does not allow it to withstand the conventional process.
- a thickness of elastomer, for example of the rubber used for the joint sleeve, of the order of a tenth of a millimeter to several millimeters is sufficient.
- the cost of such protection is tiny because it can be carried out at the same time as the preliminary injection molding of the sleeve of the part, without any additional process step.
- the invention therefore allows a substantial saving.
- the thin layer can be worn inside the frame 8, outside the frame 9, or on both surfaces at the same time.
- the profiles of the sectors such as 2 to 5 have the shape of a letter L, with a mast, or a tooth, having the relief 11 and a face in abutment against the armature 8, and a sole 22 extending radially with respect to an axis 23 of introduction of the part 7 to be expanded.
- the axis 23 is an axis of revolution if the part 7 to be expanded is circular cylindrical.
- the soles 22 allow on the one hand to receive the piece 7 to be expanded because it is placed on them.
- the soles 22 form, at the free end of the base of the L facing towards the outside, a cylindrical surface, preferably but not necessarily circular, of axis 23. This surface is provided with two notches 24 and 25.
- Elastic toroids 26 and 27 allow to exert radial forces on sectors 2 to 3 to force them to approach each other.
- the toroids 26 and 27 thus form a simple means of temporarily holding the sectors together before the installation, around them, of the part 7 to be expanded. It will be noted that if the difference between the dimensions 14 and 19 is of the order of 5 to 15%, the extension of the cores 26 and 27 will be much less. Indeed these are arranged at a periphery with a dimension 28 much larger and therefore undergo a much smaller proportional variation.
- the part 7 to be expanded has, after expansion, a profile with a part 29 which has been introduced around the sectors and which has undergone the desired expansion, a part 30 at another end which has not undergone this expansion and a part intermediate 31 allowing the connection of the diameters.
- a profile with a part 29 which has been introduced around the sectors and which has undergone the desired expansion a part 30 at another end which has not undergone this expansion and a part intermediate 31 allowing the connection of the diameters.
- the expansion is not through.
- maintaining the part 30 of the inner frame 8 can be useful so that it retains its shape. By doing so, we are therefore able to very easily master the internal shape of the part to be expanded. This is the case of the example of FIG.
- the foaming operation can preferably be carried out hot, that is to say just after the molding of the part, in order to prevent the withdrawal of the rubber due to cooling from causing problems. This precaution is interesting for very rigid mixtures which have significant thermal shrinkage.
- the anvil 16 has in a central part a massif 32 having two features. Firstly, the block 32 supports a pin 33 whose height 34 is chosen to correspond to a degree of depression of the cone 12 in sectors 2 to 5. In fact, the more this cone 12 is pressed into the sectors, the more these sectors will be brought to move away from each other. With the invention, and in particular with the pin 33, there is a simple means of ensuring the repetitiveness of the expansion operation, from one part to another. As a variant, the pin is adjustable in height (in practice, it can be removed and replaced by a pin of different height) in order to allow a variation of execution.
- the block 32 also has guide pins 35 forming radial protuberances at the periphery 36 of the block 32.
- the flanges 22 have bores 37 intended to fit slidingly around the guide pins 35. The presence of these guide pins 35 and these bores 37 makes it possible to have a permanently radial movement of the sectors 2 to 5.
- the guide pins and the bores form a radial guide for spreading the sectors.
- each sector deviates circumferentially from a contiguous sector by an expected value, in particular by the same value as any two contiguous sectors deviate from each other. the set if all the sectors are identical. In practice, by doing so we can ensure the best circularity of the internal profile of the frame 8 once expanded.
- the block 32 is for example fixed to the anvil 16 by means of a screw.
- the radial edges of the annular sectors such as 2 to 5 have, parallel to the axis 23, crenellated patterns allowing the sectors to overlap one another.
- the sector 4 comprises slots 38 to 40 interlaced with nipples 41 to 43.
- the depth of the slots 38 to 40 is equal to or greater than a quarter of the overall circumferential path 44 of a sector . It could be shown that with this overlapping of the niches and nipples of a sector, respectively in nipples and niches of adjacent sectors, the concentration of the deformation along the lines between the sectors is avoided and the formation of facets is limited. corresponding to the spaces between the spaced sectors.
- the regular character, or circular if necessary, of the expansion carried out is all the more respected as the number of sectors is high. However, the higher the number of sectors, the smaller the bearing surface - of these sectors against the reinforcement to be expanded. The above nesting increases the number of these sectors without being penalized by the corresponding reduction in area. In the preferred embodiment, there are eight sectors to form the annular expansion shape 1.
- Figures 2 to 4 show in perspective the use of the expansion device of the invention.
- the sectors naturally overlap one another, in particular because the slots 38 and 39 are themselves oriented radially.
- the massif 32 is fully equipped with sectors around its entire periphery, it is placed on the anvil 16, before or after having set up the toroids 26 and 27. Then the part to be expanded so that it comes to rest on the soles 22 in the outer part of the sectors.
- the cone 12 mounted at the end of the rod 13 in the opening resulting from the preferred interior annular shape of the assembled sectors.
- the sectors may have a shape other than circular, depending on the internal profile of the frame to be produced.
- the cone 12 sinks into the form of expansion, the sectors move away from each other. It is observed, in FIG. 3, that it is not necessary for the cone 12 to be as high as the height 440 of the sectors.
- the sectors are in one piece and extend over the entire height of the part 29 to be expanded, when the top of the cone arrives in the part of these sectors closest to the soles 22, these soles 22 continue to s 'spreading away with them the sectoral teeth.
- the action of the toroids 26 and 27 is such that it brings at least two of the sectors to one another (in practice all) so that the sectors occupy a much smaller space inside the expanded framework.
- the face of the sectoral teeth of the sectors, bearing against the frame 8 is not necessarily circular cylindrical. It is also not necessarily parallel to the axis 23.
- the part 7 to be expanded and to be constrained is therefore here for example composed of three tubular steel frames, and two rubber sleeves.
- the improvement then involves the implementation of external sectors 48 of the same type as sectors 2 to 5 with the difference that it is the radially internal surface of the sectors which comes to bear against the part to be formed.
- the slots and nipples described above can be transposed to the constricted sectors.
- the sectors 48 When the part 7 is put in place, the sectors 48 are radially spaced from the axis 23, and also from each other. They form a form of constriction. To tighten them against each other, and restrict the frame 9, the sectors 48 have on the outside an inclined face 49 playing a role similar to the draft 11. These inclined faces 49 preferably together form a truncated cone.
- the outer sectors 48 can also be nested inside each other with slots and nipples.
- the cone 12 is placed inside a conical cavity 50, the sides 51 of which are intended to bear against the faces 49.
- the cavity 50 is for example formed by a disc thick 52 carrying in elevation on the one hand the cone 12 in the central part and on the other hand a peripheral ring 53 provided with a frustoconical internal wall 51.
- a force is exerted on the whole cone 12 and ring 53.
- This assembly moves the group of sectors 48 radially inwards, as well as simultaneously the group of sectors 2 to 5 radially outwards.
- the exterior sectors 48 rest on a base 57.
- the interior sectors are guided for example according to the principles described above for the first embodiment of the invention.
- the guiding of the external sectors can be more summary because these sectors approach each other and tend to join in a shape determined by their profile.
- the O-rings 26 and 27 have the function of bringing the interior sectors back to the initial position towards the interior.
- a washer 58 made of elastomer has the function of bringing the external sectors back to the initial position towards the outside and can participate in guiding them.
- the washer 58 is placed between an internal wall 59 movable in the sectors 48 and a base 60, fixed, integral with the central solid 32. It is compressed during the constriction. After forming, it suffices to remove the disc 52 and the washer repels the sectors 48, at the same time as the seals 26 27 tighten the sectors 2 to 5.
- necking can preferably also be carried out hot.
- expansion could be carried out without the restriction or vice versa.
- the extension and or the constriction in two passes could also be envisaged to make the extension and or the constriction in two passes, the part 7 to be expanded and or to shrink being turned by half a circumferential sector pitch between two passes.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Prostheses (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02793226A EP1461171A1 (fr) | 2001-11-08 | 2002-11-08 | Procede et dispositif de dudgeonnage et articulation elastique ainsi dudgeonnee |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0114496A FR2831843B1 (fr) | 2001-11-08 | 2001-11-08 | Procede et dispositif de dudgeonnage et piece ainsi dudgeonnee |
FR01/14496 | 2001-11-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003039784A1 true WO2003039784A1 (fr) | 2003-05-15 |
Family
ID=8869221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/003856 WO2003039784A1 (fr) | 2001-11-08 | 2002-11-08 | Procede et dispositif de dudgeonnage et articulation elastique ainsi dudgeonnee |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1461171A1 (fr) |
CN (1) | CN1604827A (fr) |
FR (1) | FR2831843B1 (fr) |
WO (1) | WO2003039784A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1391186A1 (fr) * | 2002-08-21 | 2004-02-25 | BIEDERMANN MOTECH GmbH | Procédé de fabrication d'un écarteur tubulaire, et écarteur |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102430657B (zh) * | 2012-01-12 | 2013-09-25 | 信阳市四通机械制造有限公司 | 胀管器 |
CN108273911A (zh) * | 2017-07-27 | 2018-07-13 | 中国航发哈尔滨东安发动机有限公司 | 回转套筒胀型模具 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4295357A (en) * | 1978-08-28 | 1981-10-20 | General Tire & Rubber Co. | Apparatus for making metal outers and inners |
DD221936A1 (de) * | 1984-03-13 | 1985-05-08 | Rudisleben Chemieanlagenbau | Vorrichtung zum aufweiten von rohrenden |
DE4111233A1 (de) * | 1991-04-08 | 1992-10-15 | Freudenberg Carl Fa | Drehschwingungsdaempfer |
DE4339993C1 (de) * | 1993-11-24 | 1995-01-05 | Rothenberger Werkzeuge Masch | Vorrichtung zum Aufweiten von Hohlkörpern |
JPH08300070A (ja) * | 1995-04-27 | 1996-11-19 | Mitsubishi Electric Corp | 管端成形機及び被成形管の加工方法 |
-
2001
- 2001-11-08 FR FR0114496A patent/FR2831843B1/fr not_active Expired - Fee Related
-
2002
- 2002-11-08 CN CN 02825214 patent/CN1604827A/zh active Pending
- 2002-11-08 EP EP02793226A patent/EP1461171A1/fr not_active Withdrawn
- 2002-11-08 WO PCT/FR2002/003856 patent/WO2003039784A1/fr not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4295357A (en) * | 1978-08-28 | 1981-10-20 | General Tire & Rubber Co. | Apparatus for making metal outers and inners |
DD221936A1 (de) * | 1984-03-13 | 1985-05-08 | Rudisleben Chemieanlagenbau | Vorrichtung zum aufweiten von rohrenden |
DE4111233A1 (de) * | 1991-04-08 | 1992-10-15 | Freudenberg Carl Fa | Drehschwingungsdaempfer |
DE4339993C1 (de) * | 1993-11-24 | 1995-01-05 | Rothenberger Werkzeuge Masch | Vorrichtung zum Aufweiten von Hohlkörpern |
JPH08300070A (ja) * | 1995-04-27 | 1996-11-19 | Mitsubishi Electric Corp | 管端成形機及び被成形管の加工方法 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1391186A1 (fr) * | 2002-08-21 | 2004-02-25 | BIEDERMANN MOTECH GmbH | Procédé de fabrication d'un écarteur tubulaire, et écarteur |
US7131995B2 (en) | 2002-08-21 | 2006-11-07 | Biedermann Motech Gmbh | Method for the manufacture of a tubular spacer and spacer |
Also Published As
Publication number | Publication date |
---|---|
EP1461171A1 (fr) | 2004-09-29 |
FR2831843B1 (fr) | 2004-02-06 |
CN1604827A (zh) | 2005-04-06 |
FR2831843A1 (fr) | 2003-05-09 |
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