WO2001014081A1 - Verfahren zum entformen eines werkzeuges aus einem hohlen gegenstand und werkzeug zum bearbeiten eines hohlen gegenstandes - Google Patents
Verfahren zum entformen eines werkzeuges aus einem hohlen gegenstand und werkzeug zum bearbeiten eines hohlen gegenstandes Download PDFInfo
- Publication number
- WO2001014081A1 WO2001014081A1 PCT/EP2000/007640 EP0007640W WO0114081A1 WO 2001014081 A1 WO2001014081 A1 WO 2001014081A1 EP 0007640 W EP0007640 W EP 0007640W WO 0114081 A1 WO0114081 A1 WO 0114081A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stamp
- segments
- hollow object
- tool
- grooves
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/762—Coupling members for conveying mechanical motion, e.g. universal joints
- B21K1/765—Outer elements of coupling members
Definitions
- the invention relates to a method and a tool according to the preamble of claims 1 and 5, respectively.
- the field of application of the present invention lies in particular in the field of the production of external parts of constant velocity joints.
- the outer part of such a joint has an essentially cylindrical inner surface.
- Several sets of preferably helical grooves are arranged, the grooves representing helical lines extending in opposite directions.
- the grooves normally have a straight course and are inclined, for example, at an angle of approximately 16 ° with respect to the axis of rotation of the corresponding joint part instead of being exactly helical.
- Balls engage the grooves and are held by a cage, and due to the intersecting configuration of the grooves, the balls are held in the bisector plane of the joint when the joint parts are angled so that the joint is given synchronism.
- Such constant velocity joints are known under the technical term VL joints (sliding joint Löbro) or in the English-speaking world under the name cross groove joints.
- VL joints sliding joint Löbro
- FIG. 4 shows schematically how such parts are manufactured in practice. Starting from a slightly open position of the goblet-like outer part, a so-called retraction movement is carried out, in which the outer walls of the goblet-shaped outer part are pressed inwards, as is schematically indicated by arrows.
- the stamp After insertion of the stamp in its processing position into a hollow object located in a die, the latter is pressed with the stamp through the die, the peripheral wall of the hollow object being drawn in with grooves arranged therein in a cross-groove construction and against those corresponding to the grooves arranged and shaped stamp segments is pressed.
- the mandrel After this retraction of the hollow article, the mandrel is first withdrawn so that the first set of die segments can move inward and be disengaged from the grooves.
- the second set of stamp segments still remaining in the grooves can then be pulled axially out of the hollow object, the stamp being rotated according to the pitch of the grooves.
- This known method and the known device are complex, both with regard to the design of the tool and with regard to the process steps for demolding.
- two successive demolding processes are required, namely firstly the movement of the first set of stamp segments into a release position and then axial demolding of the second set of stamp segments is required, whereby this rotates with the stamp according to the pitch of the grooves is.
- the known tool is therefore to be designed so that the punch can perform the specific screw movement. This requires not only a special drive, but also a special screw guide.
- Another disadvantage of the known method and the known device is that the first set of the stamp segments are displaced into its release position by mechanical contact with the contours of the tool in the region of the grooves.
- Such a displacement contact leads in a fast functional operation, which should be aimed at, to the first set of stamp segments if the stamp is rotated during removal from the mold and the first set of stamp segments is displaced into the release position by the displacement contact.
- a substantial load on the first set of stamp segments and the resulting wear on both the hollow object and the stamp are predetermined.
- the invention has for its object to simplify a method of the type specified.
- the movement of the stamp segments in the release position is to be improved. This object is solved by the features of claim 1.
- all stamp segments are demolded into their release position by contracting movements, so that a rotary movement of the stamp can be omitted and the insertion movement of the stamp segments is sufficient to demold them.
- these parts can be axially removed from one another in a simple manner, the hollow object being separated from the stamp.
- the method according to the invention can therefore be carried out with a significantly simpler tool, since it does not require a screw movement for the stamp, including an associated guide.
- the tool can be designed so that the stamp segments are removed from the grooves during demolding, for example due to an axial movement of the stamp segments, or an actively effective insertion device can be provided as part of the tool, which actively presses the stamp segments into it Moves release position, whereby a displacement contact and resulting wear between the stamp segments and the hollow object is avoided.
- the invention is further based on the object of designing a tool of the type specified in the preamble of claim 5 such that the stamp segments or the stamp segments can be removed from the hollow object without displacement contact.
- the stamp segments are assigned an insertion device which is part of the tool and which moves the associated stamp segments in their release position. If, in the tool according to the invention, only some of the punch segments, namely the punch segments of one pitch direction, are moved into the release position with the associated insertion devices, the remaining punch segments of the other pitch direction can be removed from the mold by axially unscrewing, as is the case in the prior art.
- a slide-in device is preferably assigned to each stamp segment, so that it does not require unscrewing. In the embodiment according to the invention there is therefore no displacement contact between the relevant ones Stamp segments and the hollow object during removal from the mold and therefore there is also no wear on the stamp segments and on the hollow object resulting from the displacement contact, and disturbances resulting from the displacement contact.
- the subclaims contain features that further simplify and improve both the method and the tool. For example, it is possible to derive the insertion movement from an axial movement of the stamp segments, so that no special independent drive for the stamp segments is required. It is furthermore advantageous and simplifying to bring about the axial movement of the stamp segments by means of an axial movement caused on the hollow object. This simplifies and accelerates the stripping of the hollow object from the stamp. Further features in the subclaims lead to simple, small, functionally reliable and inexpensive to manufacture designs which can be integrated very advantageously in a stamp.
- FIG. 1 shows a first exemplary embodiment of the present invention, in which the deformed object is finally ejected upwards
- FIG. 2 shows an alternative exemplary embodiment to FIG. 1, in which, after the hollow object has been reshaped, it is transported (falls) away from the tool,
- FIG. 3 shows a schematic view of the outer part of a VL joint
- FIG. 4 schematically shows the retraction movement of the outer walls of the cup-shaped outer part of the VL joint, as is carried out in a tool according to the present invention.
- Figure 1 shows the main parts of a tool according to the invention in axial section.
- the main parts are a die 1 in the form of a hollow cylindrical body which, in the present exemplary embodiment, is mounted with a vertical central axis 2 in a die holder 3, which can be the lower part of a press.
- a stamp designated 4 in its entirety attached to a punch holder 5, which is vertically displaceable in a vertical guide, not shown, by a drive, not shown, with the punch 4, as shown by the double arrow 5a, and which can be the upper part of a press.
- a stamp ring 6 is arranged above the die 1 on the underside of the stamp holder 5, for example in a fixed manner, and a stripper 7 is arranged vertically displaceably below the stamp holder 5, which will be described further below.
- the punch 4 consists of a mandrel 8, on the circumference of which several, for example 6 pieces, punch segments 9a, 9b are arranged and are mounted so as to be radially and axially displaceable relative to the mandrel 8.
- a tool 10 thus formed serves to form a hollow object 11, in the present exemplary embodiment the outer part of a constant velocity joint, in the region of a peripheral wall 12, which is an integral part of a pot-shaped body 13, from the bottom wall of which a pin 14 coaxially extends outwards extends.
- the hollow article 11 is in a prefabrication form in which the peripheral wall 12 is converged inwardly converging, as shown in the drawing on the left side of the central axis 2, in which the hollow article 11 and the tool 10 are in an intermediate stage of a manufacturing process are located. To the right of the central axis 2 are the hollow object 11 and the tool 10 in a further process stage, which will be described later.
- peripheral wall 12 On the inner circumferential surface 15 of the peripheral wall 12 there are a plurality of mutually opposite, simplified illustrated grooves 16, 17 which extend from the free edge of the peripheral wall 12 to the bottom of the pot-shaped body 13 or can be spaced from the free edge, with respect to the respective associated longitudinal center plane E run obliquely or helically, each pair of grooves being provided which run obliquely or helically in opposite directions.
- Such a groove course is known per se in the case of a constant velocity joint and is therefore not required to be described in more detail.
- the grooves 16, 17 are already preformed in the prefabricated form on the inner lateral surface 15, as is indicated in simplified form on the left in dashed lines .
- the stamp segments 9a, 9b each have, on the outside of a lower end section 18, with which they can be moved into the recess 19 of the pot-shaped body 13, a bead 21a, 21b, shown in simplified form, the cross-sectional shape and extension direction of an associated groove 16, 17 corresponds so that the longitudinal axes of the beads 21a, 21b cross each other.
- the length a of the strip-shaped stamp segments 9a, 9b which extends in the longitudinal direction of the dome 8, is dimensioned several times greater than the depth b of the recess 19. In the present exemplary embodiment, the length a is dimensioned approximately four times as great as the depth b.
- the stamp segments 9a, 9b are preferably each mounted radially or axially parallel with respect to the central axis 2 and can be inserted.
- a radial guide 23 is provided, which can be located, for example, in the form of guide grooves on the mandrel 8 or on the stamp ring 6, which has an axial through hole 24 for the stamp 4, the cross-sectional shape and size of the cross-sectional shape and size of the stamp 4 in the illustrated corresponds to the radially extended position of the stamp segments 9a, 9b, as shown in FIG. 1.
- a wedge drive 26a, 26b with wedge or cone surfaces 27, 28 each extending parallel to one another is provided as a radial ejection device 25 for radially displacing the stamp segments 9a, 9b, and on the inner surface of the dome 8 and on the inside of the stamp segments 9a, 9b in their end areas, so that there is an axial center distance c between the wedge drives 26a, 26b, each associated with a stamp segment 9a, 9b, which is also a multiple of the depth b.
- Corresponding wedge surfaces 27, 28 are each arranged radially offset from one another and divergent in the direction of the stamp holder 5, so that the stamp segments 9a, 9b each radially inward with an axial displacement relative to the dome 8 to the hollow object 11 and with an opposite axial Shift radially outward parallel.
- the radial stroke d of the punch segments 9a, 9b is dimensioned greater than the depth of the grooves 16, 17.
- the wedge drives 26a, 26b are matched to one another such that the position of the beads 21a, 21b in the extended position of the position of the grooves 16 , 17 corresponds to the completion of the peripheral wall 12 and in the radially inserted position the beads 21a, 21b are located within the hollow cylindrical free space of the recess 19.
- their free ends facing the hollow object 11 and the free end of the dome 8 approximately terminate with one another.
- the wedge or cone surfaces 27, 28 of the front wedge drive 26a are located in the free end region 8a of the cathedral and in the front end region 18, in which the beads 21a, 21b are also located on the outside.
- the plunger segments 9a, 9b are each assigned an essentially radially inwardly directed insertion device 31, which shifts them inward from their radially extended working position into a release position, this insertion device 31 each interacting with a longitudinally effective adjustment device with which the plunger segments 9a, 9b can be moved longitudinally from their rear working position with respect to the mandrel 8 into the front release position towards the free end section 8a of the dome 8.
- the insertion device 31 is likewise formed by a wedge drive 33 with an outer wedge or cone surface 34 on the outside of the associated stamp segment 9a, 9b and an inner wedge or cone surface 35 on the stamp ring 6, the latter being able to be arranged in the through hole 24.
- the stripper already mentioned and designated 7 can be moved vertically independently of the stamp holder 5, which is illustrated by the double arrow 37. It can be formed by a ring or a plate with a through hole 39 through which the punch 4 extends with play.
- a rod 41 can be provided, which in the present exemplary embodiment is slidably mounted in a vertical guide hole 42 in the stamp holder 5 and in the stamp ring 6 and can be moved up and down by a drive (not shown).
- the stamp 4, the scraper 7 and the stamp holder 5 with the stamp ring 6 are located at such a large distance above the die 1 that a hollow object 11 can be inserted into a receiving hole 43 corresponding to the prefabricated shape of the hollow object 11 is.
- the receiving hole 43 is formed by a bore 44 and a conical bore extension 45 in the upper edge region of the die 1, the cone angle W of which corresponds to the cone angle of the hollow object 11 in its prefabricated form and the cross-sectional size of the bore 44 corresponds to the cross-sectional size of the finished shape of the hollow object 11, so that the latter can be inserted into the receiving hole 43 so that the divergent peripheral wall 12 is located in the hole extension 45.
- the insertion of the optionally heated hollow object 11 takes place in a specific position of the grooves 16, 17 with respect to the circumferential direction, which corresponds to the position of the beads 21a, 21b.
- the stamp 4 with its respective stamp segments 9a, 9b is moved into the recess 19, the front ends of the stamp segments 9a, 9b and possibly also the front end of the mandrel 8 abutting against the bottom wall of the pot-shaped body 13 and the Stamp 4 can be advanced in one go into the stroke position shown in the figure on the right, the circumferential wall 12 with its grooves 16, 17 being drawn in against the beads 21a, 21b and the grooves 16, 17 being reshaped or calibrated or, if appropriate, completely can be formed, wherein the molding process of the hollow object 11 is finished.
- an axially effective positive connection 46 is present between the peripheral wall 12 and the mold segments 9a, 9b, which is caused by the engagement of the beads 21a, 21b in the grooves 16, 17.
- the hollow object 11 and the punch 4 are moved together out of the die 1, for which purpose an ejection stamp, not shown, which is effective against the hollow object 11 from below can serve.
- the scraper 7 is then advanced as part of the adjusting device for axially moving the stamp segments 9a, 9b relative to the dome 8 against the hollow object 11.
- the stamp segments 9a, 9b take part in this forward movement, since their beads 21a, 21b are located in the grooves 16, 17 and thus there is a positive connection 46 between the stamp segments 9a, 9b and the hollow object 11.
- the wedge drives 33 turn out to be gearboxes which convert the axial advance movement of the stamp segments 9a, 9b into a radially inward insertion movement 9d, whereby the stamp segments 9a, 9b are simultaneously displaced inwards, in that the previously close to each other arranged wedge and cone surfaces 34, 35 meet and trigger the wedge drive effect.
- the stamp segments 9a, 9b are in their inwardly displaced release position, the entrainment connection or positive connection 46 with the hollow object 11 is canceled, so that the latter is also stripped from the stamp segments 9a, 9b or can fall off.
- a retraction device 47 for the stamp segments 9a, 9b is pretensioned with one or more springs 48, for example pressure springs, arranged distributed around the circumference.
- the retraction device 47 can have one or more stop parts 49 or a stop ring which engages behind a radial projection 51 at the rear end of the stamp segments 9a, 9b.
- the stamp segments 9a, 9b are pushed back into their starting position by the retraction device 47, while at the same time they are parallel to the outside by the wedge drives 26a, 26b Working position to be shifted.
- the spring 48 is arranged in a blind hole 52 open on the top side in the stamp holder 5 or in the stamp ring 6 and clamped between the base thereof and the stop part 49.
- An essential feature of the tool 10 according to the invention is thus the inevitably effective insertion device 31, which moves the stamp segments 9a, 9b radially inward into their release position during their axial forward movement, in which the positive connection 46 is released and thus the hollow object 11 is released and further stripped can be or can fall off in the present exemplary embodiment.
- This ensures a simple and trouble-free function with a simple design of the tool 10.
- the insertion device 31 and also the adjusting device can be realized in a simple and inexpensive construction, which can also be integrated into the tool 10 in a simple manner and are of safe function.
- the insertion device 31 is arranged in the axial direction between the associated wedge drives 26a, 26b, the wedge or cone angles of the cone or wedge surfaces 34, 35 on the one hand and 27, 28 on the other hand being essentially the same and in the working position according to the drawing the cone or wedge surfaces 34, 35 of the wedge drive 33 are only a small distance apart. This also essentially ensures a parallel or radial displacement inwards of the stamp segments 9a, 9b.
- the adjusting device 32 can also be formed in that a corresponding axially effective feed device acts directly on the stamp segments 9a, 9b.
- all the stamp segments 9a, 9b are preferably moved simultaneously into the above-described release position, so that an axial retraction movement of the stamp segments 9a, 9b and any further axial movement of the mandrel 8 which may be required are sufficient to demould the stamp 4 from the hollow object 11 to effect.
- the insertion device 31 it is also possible to provide the insertion device 31 only for the one or more shaped segments 9a or 9b of the one oblique course or screw course of the associated beads 21a or 21b, so that only one type of stamp segment 9a or 9b is shifted into the release position while the other type remains in the working or engagement position.
- the deformed hollow object is ejected upwards by means of an ejection device after the stamp has been removed and withdrawn, and then removed from the tool, for example by a suitable manipulator.
- FIG. 2 shows an alternative exemplary embodiment which differs from the exemplary embodiment according to FIG. 1 only in that the tool is designed in such a way that the deformed hollow object can finally drop downward.
- the stroke of the punch 8 is dimensioned such that, after the retraction movement in the tool die 1, it can push the hollow object 11 thus shaped downward out of the die 1.
- a slide 100, 101 is now turned inward beyond the top of the outer wall of the hollow object 11 wheeled in.
- the punch 8 can now be pulled out upwards and the corresponding folding movements for the punch segments can be controlled.
- the stamp 8 has been released from the hollow object 11 upwards, the hollow object 11 falls away downward and can be transported away for further processing, for example, by a conveyor belt.
- This embodiment according to FIG. 2 is advantageous over that of FIG. 1 in that the ejector for the final ejection of the deformed object 11 can be dispensed with.
- the slide device 100, 101 with a stripping effect, which is additionally necessary in the exemplary embodiment in FIG. 2, is, on the other hand, considerably less complex in terms of construction.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Turning (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001518207A JP2003507188A (ja) | 1999-08-19 | 2000-08-07 | 中空体から工具を離脱させる方法、及び中空体を形成するための工具 |
AT00958388T ATE280645T1 (de) | 1999-08-19 | 2000-08-07 | Verfahren zum entformen eines werkzeuges aus einem hohlen gegenstand und werkzeug zum bearbeiten eines hohlen gegenstandes |
US10/049,873 US6684678B1 (en) | 1999-08-19 | 2000-08-07 | Method for extracting a tool from a hollow object and tool for machining a hollow object |
EP20000958388 EP1204496B1 (de) | 1999-08-19 | 2000-08-07 | Verfahren zum entformen eines werkzeuges aus einem hohlen gegenstand und werkzeug zum bearbeiten eines hohlen gegenstandes |
AU69932/00A AU6993200A (en) | 1999-08-19 | 2000-08-07 | Method for extracting a tool from a hollow object and tool for machining a hollow object |
DE50008437T DE50008437D1 (de) | 1999-08-19 | 2000-08-07 | Verfahren zum entformen eines werkzeuges aus einem hohlen gegenstand und werkzeug zum bearbeiten eines hohlen gegenstandes |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19939383.4 | 1999-08-19 | ||
DE19939383 | 1999-08-19 | ||
DE19943805.6 | 1999-09-13 | ||
DE19943805A DE19943805B4 (de) | 1999-08-19 | 1999-09-13 | Verfahren zum Entformen eines Stempels aus einem hohlen Gegenstand und Werkzeug zum Bearbeiten von Rillen an der Innenmantelfläche eines solchen hohlen Gegenstands |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001014081A1 true WO2001014081A1 (de) | 2001-03-01 |
Family
ID=26054652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/007640 WO2001014081A1 (de) | 1999-08-19 | 2000-08-07 | Verfahren zum entformen eines werkzeuges aus einem hohlen gegenstand und werkzeug zum bearbeiten eines hohlen gegenstandes |
Country Status (7)
Country | Link |
---|---|
US (1) | US6684678B1 (de) |
EP (1) | EP1204496B1 (de) |
JP (1) | JP2003507188A (de) |
AT (1) | ATE280645T1 (de) |
AU (1) | AU6993200A (de) |
ES (1) | ES2226909T3 (de) |
WO (1) | WO2001014081A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05185177A (ja) * | 1992-01-10 | 1993-07-27 | Honda Motor Co Ltd | バルブスリーブの製造方法 |
DE4433991A1 (de) * | 1994-09-23 | 1996-03-28 | Doege Eckart | Spreizwerkzeug zur Herstellung hinterschnittener Werkstücke |
JPH09122815A (ja) * | 1995-10-31 | 1997-05-13 | Ntn Corp | 等速自在継手外輪の製造方法およびその内型装置 |
US5765430A (en) * | 1995-09-27 | 1998-06-16 | Ntn Corporation | Method for and apparatus of producing outer member of universal joint having cross-grooves |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0718452Y2 (ja) * | 1987-04-28 | 1995-05-01 | 株式会社小松製作所 | 等速ジヨイントの外輪加工用パンチ |
FR2649024B1 (fr) * | 1989-07-03 | 1994-05-13 | Peugeot Automobiles | Procede de fabrication d'une piece presentant une surface interne partiellement spherique et une extremite ouverte |
-
2000
- 2000-08-07 EP EP20000958388 patent/EP1204496B1/de not_active Expired - Lifetime
- 2000-08-07 AU AU69932/00A patent/AU6993200A/en not_active Abandoned
- 2000-08-07 WO PCT/EP2000/007640 patent/WO2001014081A1/de active IP Right Grant
- 2000-08-07 JP JP2001518207A patent/JP2003507188A/ja active Pending
- 2000-08-07 AT AT00958388T patent/ATE280645T1/de not_active IP Right Cessation
- 2000-08-07 ES ES00958388T patent/ES2226909T3/es not_active Expired - Lifetime
- 2000-08-07 US US10/049,873 patent/US6684678B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05185177A (ja) * | 1992-01-10 | 1993-07-27 | Honda Motor Co Ltd | バルブスリーブの製造方法 |
DE4433991A1 (de) * | 1994-09-23 | 1996-03-28 | Doege Eckart | Spreizwerkzeug zur Herstellung hinterschnittener Werkstücke |
US5765430A (en) * | 1995-09-27 | 1998-06-16 | Ntn Corporation | Method for and apparatus of producing outer member of universal joint having cross-grooves |
JPH09122815A (ja) * | 1995-10-31 | 1997-05-13 | Ntn Corp | 等速自在継手外輪の製造方法およびその内型装置 |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 017, no. 607 (M - 1507) 9 November 1993 (1993-11-09) * |
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 09 30 September 1997 (1997-09-30) * |
Also Published As
Publication number | Publication date |
---|---|
JP2003507188A (ja) | 2003-02-25 |
US6684678B1 (en) | 2004-02-03 |
ES2226909T3 (es) | 2005-04-01 |
EP1204496B1 (de) | 2004-10-27 |
AU6993200A (en) | 2001-03-19 |
EP1204496A1 (de) | 2002-05-15 |
ATE280645T1 (de) | 2004-11-15 |
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