WO2009074217A2 - Ensemble composé d'une partie support et d'un insert fileté, procédé de fabrication de l'ensemble et dispositif de moulage par injection de l'insert fileté - Google Patents

Ensemble composé d'une partie support et d'un insert fileté, procédé de fabrication de l'ensemble et dispositif de moulage par injection de l'insert fileté Download PDF

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Publication number
WO2009074217A2
WO2009074217A2 PCT/EP2008/009824 EP2008009824W WO2009074217A2 WO 2009074217 A2 WO2009074217 A2 WO 2009074217A2 EP 2008009824 W EP2008009824 W EP 2008009824W WO 2009074217 A2 WO2009074217 A2 WO 2009074217A2
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WO
WIPO (PCT)
Prior art keywords
threaded insert
insert
threaded
mold half
ribs
Prior art date
Application number
PCT/EP2008/009824
Other languages
German (de)
English (en)
Other versions
WO2009074217A3 (fr
Inventor
Rainer Süssenbach
Original Assignee
Böllhoff Verbindungstechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Böllhoff Verbindungstechnik GmbH filed Critical Böllhoff Verbindungstechnik GmbH
Publication of WO2009074217A2 publication Critical patent/WO2009074217A2/fr
Publication of WO2009074217A3 publication Critical patent/WO2009074217A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2618—Moulds having screw-threaded mould walls
    • B29C45/262—Moulds having screw-threaded mould walls provided with unscrewing drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/442—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor
    • B29C33/444—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor for stripping articles from a mould core, e.g. using stripper plates
    • B29C33/446—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor for stripping articles from a mould core, e.g. using stripper plates and using a rotating movement to unscrew articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
    • F16B37/122—Threaded inserts, e.g. "rampa bolts"
    • F16B37/125—Threaded inserts, e.g. "rampa bolts" the external surface of the insert being threaded

Definitions

  • the present invention relates to an assembly of a support member and a threaded insert embedded therein, both made of thermoplastic material, a method of manufacturing the assembly and a threaded insert for the assembly.
  • the invention further relates to a device for injection molding of the threaded insert.
  • Threaded inserts made of thermoplastic material which are thermally embedded in likewise made of thermoplastic plastic carrier parts are known for example from DE 42 27 273 C2.
  • the threaded insert has an internal thread and is provided on its outer side with a larger number of annular ribs, which can also be formed as threads.
  • the outer surface of the threaded bushing is slightly conical shaped with a cone angle of about 8 ° to be inserted into a correspondingly tapered receiving hole of the support member.
  • the material used for the threaded insert and the carrier part are the same or at least identical plastics used to produce a cohesive connection between threaded insert and carrier part.
  • the annular ribs form with the molten and re-solidified, correspondingly annular perforated wall of the threaded insert a positive connection, which secures the threaded insert in the axial direction in the carrier part.
  • the threaded insert is provided with two axially opposing axially extending grooves.
  • Thread inserts made of metal are also known, which are embedded by ultrasonic welding in support parts made of thermoplastic material, see, for example, EP 1 229 256. These threaded inserts each have two sections with a plurality of ribs, which run helically in opposite directions under a relatively large pitch angle, the two sections being separated by a
  • a thread insert which has a substantially cylindrical shape and is provided on its outside with ribs which extend helically at an angle of 5 ° to 45 ° with respect to the cylinder axis.
  • the threaded insert is made of a hard, abrasion resistant material, especially steel, while the carrier part is made of a softer material.
  • the threaded insert is driven with a hammer or a press into a receiving hole of the support member so that the threaded insert rotates into the receiving hole.
  • Thread inserts made of plastic are produced by injection molding.
  • the injection mold usually consists of axially divided jaws, which are moved apart for demolding in the radial direction. This production of the threaded inserts is comparatively complicated, since the "jaw demolding" requires long cycle times and permits only comparatively small quantities
  • the present invention has for its object to provide an assembly of a support member and an embedded therein threaded insert, both made of thermoplastic material, a method for producing the assembly and a threaded insert for this purpose, which allow the simplest and most economical production of the threaded insert and lead to the highest possible extraction and rotational strength of the thermally embedded threaded insert in the support part. Furthermore, a device for injection molding of the threaded insert is to be created, with which the threaded insert can be produced in a simple and economical manner.
  • the arrangement, the method of manufacturing the assembly and the threaded insert according to the invention are defined in claims 1, 7 and 9, respectively.
  • the device for injection molding is defined in claim 22.
  • the thermoplastic insert consisting of threaded insert as a substantially bush-shaped body with a plurality of the Outside provided, helically extending ribs whose pitch angle is greater than 40 ° and preferably between 45 ° and 75 °.
  • the threaded insert for embedding the threaded insert in the likewise consisting of thermoplastic plastic carrier part plastic at least the hole wall of Aufhahme- hole of the support member is melted and pressed the threaded insert by an axial force in the molten plastic so that the molten plastic through the spaces between the helically extending ribs of the threaded insert flows, whereupon the molten plastic is allowed to harden.
  • the wendelfo ⁇ nig extending under a relatively large pitch angle ribs of the threaded insert thus ensure a positive connection that can accommodate high loads not only in the axial direction, but also in the direction of rotation or torsion.
  • the plastic threaded insert is thus embedded in the plastic carrier part with high pull-out and torsional strength.
  • the threaded insert can therefore be formed without axial grooves, slots or other recesses for rotational security.
  • ultrasonic vibrations are preferably used, wherein the ultrasonic vibrations and applied to the impressions of the threaded insert axial force are generated simultaneously by an ultrasonic sonotrode.
  • a significant advantage of the invention is that the injection molding of the threaded insert is considerably simplified. As will be explained in more detail, a jaw removal of the threaded insert from the injection mold is not required. It can be achieved significantly shorter cycle times, and with the same Spritzg screenfo ⁇ n a larger number of threaded inserts is possible. Overall, the production costs can be significantly reduced by the invention.
  • the threaded insert consists of two conical sections, the larger base areas in a common Ra Dialebene the threaded insert are, with respect to which the threaded insert is formed mirror-symmetrical.
  • This form of threaded insert has the advantage that the threaded insert can be embedded in the carrier part from both axial sides. Since a corresponding directional orientation is thus not required, singulation, feeding and installation of the threaded insert in the carrier part simplify.
  • the threaded insert consists of a conical portion and a cylindrical portion, which merge into each other in the region of the largest diameter of the conical portion.
  • a flange is provided which provides a clean transition between the surface of the support member and the top of the embedded threaded insert.
  • a suitable device for Spritzg representsen the threaded insert consists of an upper mold half and a lower mold half, which together form a lying on a central axis mold cavity corresponding to the outer shape of the threaded insert, wherein the upper mold half has a contour insert, which forms at least a portion of the mold cavity and relative to a support plate of the upper mold half is freely rotatably mounted about the central axis, so that the lower mold half is displaceable relative to the upper Fo ⁇ nhayne to separate the two mold halves along the central axis and in this case the finished threaded insert while rotating the contour insert from the upper mold half withdraws.
  • the lower mold half has a threaded spindle which projects into the mold cavity to mold the inner hole of the threaded insert and is rotationally drivable with respect to a mold plate of the lower mold half to unscrew the threaded spindle from the finished threaded insert after the threaded insert has been withdrawn from the upper mold half ,
  • the terms “upper” and “lower” are used in this context only to better distinguish the two mold halves; In principle, the two mold halves can be arranged in any vertical, horizontal or oblique position to each other.
  • the freely rotatably mounted contour insert of the upper Fo ⁇ nhucc allows easy axial removal of the lower mold half with the still stuck there Threaded insert.
  • the threaded spindle can then be easily unscrewed from the inner hole of the threaded insert.
  • a jaw removal of the threaded insert is thus not required, which, as already explained above, the simplified production of the threaded insert (shorter cycle times, larger numbers) allowed.
  • the threaded spindle for ejecting the finished threaded insert is axially displaceable relative to the mold plate of the lower mold half.
  • a fixed housing stop is expediently provided, which limits the unscrewing movement of the threaded spindle from the threaded insert, so that the threaded spindle can be used to eject the finished threaded insert.
  • Fig. 1 is a perspective view of an embodiment of an inventively designed threaded insert
  • Fig. 2 is a partially cutaway side view of the threaded insert in Fig. 1;
  • FIG. 3 is a plan view of the threaded insert of Figures 1, 2 in the axial direction.
  • Fig. 4 is a perspective view corresponding to Figure 1 of a slightly modified threaded insert.
  • Fig. 5 is a side view corresponding to FIG. 2 of the threaded insert of
  • Fig. 6 is a Figures 1 and 4 corresponding perspective view of another exemplary embodiment of an inventively designed threaded insert
  • Fig. 7 is a Figures 2 and 5 corresponding side view of the threaded insert of Fig. 6;
  • FIGS. 8 shows a plan view of the threaded insert of FIGS. 6, 7 in the axial direction; 9 shows a schematic sectional illustration of an arrangement of a carrier part and the threaded insert of FIGS. 1 to 3 at the beginning of the insertion process;
  • FIG. 10 shows a representation corresponding to FIG. 9 at the end of the insertion process
  • FIG. Fig. 11 is a partially cutaway perspective view of the arrangement of Fig. 10;
  • FIG. 12 shows a representation corresponding to FIG. 9 for a threaded insert according to FIGS. 6 to 8;
  • FIG. 13 shows a representation corresponding to FIG. 10 for the threaded insert of FIGS. 6 to 8;
  • FIG. 14 shows an illustration corresponding to FIG. 11 for the threaded insert of FIGS. 6 to 8;
  • Figures 15 to 18 are schematic sectional views of a portion of an apparatus for injection molding of the threaded insert of Figures 1 to 3 in successive stages of demolding the finished threaded insert from the injection mold;
  • FIGS. 19 to 22 representations corresponding to FIGS. 15 to 18 for demolding a threaded insert according to FIGS. 6 to 8.
  • FIGS. 1 to 3 show a threaded insert 2 made of plastic for thermal embedding in a receiving bore 6 of a carrier part 4 made of plastic (FIGS. 9 to 11).
  • the threaded insert 2 has the shape of a substantially bush-shaped body 8 with an axially continuous inner hole 10.
  • the inner hole 10 is provided with an internal thread 12, which may be formed in any desired manner depending on the application.
  • a reduction 14a and 14b is provided at each axial end of the Aufhahmeloches 10 .
  • the body 8 is provided on its outer peripheral side with helically extending ribs 16 which form between them spaces 18 in the form of helically extending grooves.
  • the ribs 16 all extend in the same winding direction and extend over the entire axial length of the threaded insert 2.
  • the body 8 is bounded at its two axial ends of planar end faces, each lying in a radial plane with respect to the axis A of the threaded insert.
  • the pitch angle ⁇ of the helically extending ribs 18 (FIG. 2) is approximately 60 ° in the illustrated embodiment. It is in any case greater than 40 ° and is preferably in the range of 45 ° to 75 °.
  • This course of the ribs 16 is in terms of anchoring and insertion of the threaded insert in the support member and in terms of injection molding of the threaded insert advantageous, as will be explained in more detail.
  • the ribs 16 have a triangular cross-section.
  • the angle ⁇ of the triangles in the tips of the ribs 16 in the illustrated embodiment is approximately 90 ° and is preferably in the range of 70 ° to 110 °.
  • the number of ribs 16 in the illustrated embodiment is approximately 90 ° and is preferably in the range of 70 ° to 110 °.
  • the height and thus the size of the cross section of the ribs 16 together with the angle ß and the number (the pitch) of the ribs are chosen so that thermal embedding of the threaded insert 2 into the carrier part 4 results in an optimal displacement and deformation of the plasticized plastic.
  • the body 8 of the threaded insert 2 consists of two conical sections 8a and 8b.
  • Each of the conical sections 8a, 8b has a conical outer shape (imaginary envelope) whose cone angle a (FIG. 2) is on the order of 8 °.
  • the preferred range of the cone angle a is 3 ° to 13 °.
  • the conical sections 8a and 8b are arranged such that their larger base surfaces lie in a common central radial plane E.
  • the threaded insert 2 is designed to be mirror-symmetrical overall. This means that the inner hole 10, thread 12, depressions 14a, 14b, ribs 16 and intermediate spaces 18 of the two sections 8a and 8b of the body 8 are formed identically and arranged mirror-symmetrically to the radial plane E.
  • the threaded insert can be used from both axial sides in the Aufhahmeloch of the support member. A corresponding directional orientation is therefore not required. This is advantageous with regard to singling and feeding the threaded inserts to the mounting location as well as when inserting the threaded insert in the Aufhahmeloch and when using the embedded threaded insert as a connecting element.
  • the threaded insert shown in Figures 4 and 5 differs from that of Figures 1 to 3 only in that the helical extending ribs 16 of the portion 8a of the body 8 are slightly offset from those of the portion 8b in the circumferential direction. This offset of the ribs 16 is more likely to occur accidentally during injection molding of the threaded insert, as will be explained in more detail.
  • the carrier part 4 and the threaded insert 2 are made of thermoplastic material. While for the support member 4 in principle any thermoplastic material comes into question, it is in the plastic of the threaded insert 2 is preferably a high-performance engineering plastic with a glass fiber or carbon fiber filler, in particular PPA-GF or PPS-GF or PEI-GF or PEEK-GF or PAEK-CF. These plastics are characterized by high temperature resistance, high rigidity and high strength with low water absorption.
  • the support member 4 may be made of the same plastic or a similar
  • the threaded insert 2 can consist of a plastic other than the carrier part 4 or of a plastic with increased strength compared to the carrier part.
  • the increased strength can be achieved, for example, by the nature and proportion of the filler, suitable fillers being, for example, glass fibers, glass beads, carbon fibers or minerals.
  • the threaded insert 2 In order to insert the threaded insert 2 into the carrier part 4, the threaded insert 2 is first axially inserted from above into the receiving hole 6.
  • the receiving hole 6 has the same conicity (cone angle a) as the conical sections 8 a and 8 b of the threaded insert 2 and is matched in terms of its diameter on the threaded insert so that the threaded insert initially only over part of his
  • Length can be used in the Aufhahmeloch 6.
  • the selected conicity of threaded insert and Aufhahmeloch ensure proper centering of the threaded insert and in particular for a self-locking in the system between Threaded insert and bore wall 22 of the Aufhahmeloches 6. This simplifies the pre-assembly.
  • the sonotrode 20 of an ultrasonic device is attached to the upper end face of the threaded insert, as indicated schematically in FIG. 9.
  • the sonotrode 20 sets the threaded insert 2 in ultrasonic vibrations, which are transmitted via the outer edges (tips) of the ribs 16 on the bore wall 22 of the support member 4.
  • the plastic is melted at least the bore wall 22 at the contact points (plasticized).
  • the sonotrode 20 exerts a downward axial force on the
  • Thread insert 2 so that the threaded insert is pressed into the Aumahmeloch 22.
  • molten plastic flows upwardly through the spaces 18 (grooves) between the helically extending ribs 16. This ensures that the gaps 18 are completely filled with plastic.
  • the helical course of the ribs 16 and spaces 18 also has the advantage that when depressing the threaded insert air over the helical spaces can escape upwards, hu prior art, in which such venting is not possible, often occurs the difficulty that the threaded insert due to compression of the trapped air immediately after the thermal setting process slightly back in the axial direction. This is avoided in the method according to the invention due to the venting via the helical intermediate spaces 18.
  • the threaded insert embedded in the carrier part has strength. Therefore, if the threaded insert embedded in the carrier part is now used as a connecting element, it can absorb relatively high forces both in the axial direction and in the direction of rotation. Due to the design of the threaded insert 2 as a double cone can remain in the region of the upper axial end of the threaded insert 2, a small gap 24 between threaded insert and carrier part, as shown in exaggerated in Fig. 11. The gap 24 may be distracting in certain applications. When using a threaded insert 2 ', as shown in Figures 6 to 8, such a gap 24 is avoided.
  • FIGS. 6 to 8 the same reference numerals are used for components of the threaded insert 2 'which are identical to those of the threaded insert 2 of FIGS. 1 to 3, while the corresponding reference numerals, provided with an apostrophe, are used for corresponding but modified components , be used.
  • the threaded insert of FIGS. 6 to 8 coincides with the threaded insert 2 of FIGS. 1 to 3 insofar as nothing else is mentioned below.
  • the threaded insert 2 'of Figures 6 to 8 is also formed as a substantially bush-shaped body 8' with an inner hole 10, thread 12 and helically extending ribs 16 with gaps 18.
  • the threaded insert 2 'of Figures 6 to 8 is also formed as a substantially bush-shaped body 8' with an inner hole 10, thread 12 and helically extending ribs 16 with gaps 18.
  • the threaded insert 2 but not two conical sections, but from a cylindrical portion 8a' and a conical portion 8b.
  • the conical portion 8b is identical to the conical portion 8b of Figs. 1 to 3, while the cylindrical portion 8a 'has a cylindrical outer shape (imaginary envelope) and is formed so that the ribs 16 extending in the same winding direction smoothly and smoothly into the Pass ribs of the conical section 8b.
  • a flange 26 is formed in the form of an annular disc whose diameter corresponds to the maximum diameter of the receiving hole 10 of the support member 4 (Fig. 12) and thus slightly larger than the outer diameter of the cylindrical portion 8a 'is.
  • the flange 26 is provided with two opposite flats 28, which, as will be described, serve to demould the threaded insert 2 'from the injection mold and otherwise have no function. Since the threaded insert 2 'is not formed mirror-symmetrically with respect to its central radial plane, it is provided for ease of directional orientation with a bottom wall 30 which closes the inner hole 10. As can be seen in Fig.
  • the bottom wall is provided with a predetermined breaking point 32 in the form of an annular recess.
  • a predetermined breaking point 32 in the form of an annular recess.
  • the thermal embedding of the threaded insert 2 'in the support member 4 is carried out in the same manner as the thermal embedding of the threaded insert 2, which is easily understood by comparing Figures 12 to 14 with Figures 9 to 11.
  • Fig. 14 shows that the flange 26 of the threaded insert 2 'provides a smooth transition between the tops of the threaded insert 2' and the support member 4, which is sometimes desirable for aesthetic reasons.
  • the threaded insert 2 in Figures 1 to 5 consists of two conical sections 8a and 8b, while the threaded insert 2 'of Figures 6 to 8 consists of a cylindrical portion 8a and a conical portion 8b.
  • the threaded insert could be given a cylindrical outer shape as a whole. In this case, it should be provided at one end or at both ends with a cylindrical shoulder for centering in the correspondingly formed receiving hole of the carrier part.
  • FIGS. 15 to 18 show successive stages of the removal of an injection-molded threaded insert 2 from the injection mold shown only schematically.
  • the injection mold consists of an upper mold half 34 and a lower mold half 36 which abut one another in a plane perpendicular to a central axis A separating plane T and by an axial sliding movement of the lower mold half 36 can be separated relative to the upper Fo ⁇ nhdon 34.
  • the upper mold half 34 has a mold plate 37, in which a contour insert 38 is freely rotatably mounted.
  • the pivot bearing is shown schematically in Fig. 15 in the form of a radial bearing 40 (needle bearing) and a thrust bearing 41 (ball bearing).
  • the lower mold half 36 consists of a mold plate 42, which forms a mold cavity 44 for forming the threaded insert 2 together with the contour insert 38 of the upper mold half 34.
  • the mold cavity 44 is divided by the parting plane T so that the lying in the contour insert 38 part 44 a of the conical portion 8 a of the threaded insert and lying in the lower mold half 36 part 44b forms the conical portion 8b of the threaded insert.
  • the parting plane T of the injection mold and the radial plane E (FIG. 2) of the injection-molded threaded insert coincide.
  • a threaded spindle 48 is provided, which is rotatably mounted and axially displaceable in the lower mold half 36.
  • the threaded spindle 48 has a threaded portion 50 which projects far enough in the closed state of the injection mold in the hollow cavities 44 to form the entire thread 12 in the inner hole 10 of the threaded insert 2.
  • the threaded portion 50 is followed by a threadless shank portion 52, which at its upper end into the mold cavity
  • a head portion 54 is provided, over which the threaded spindle 48 can be rotated and axially displaced relative to the mold plate 42 by a drive (not shown).
  • a counterpart to the threaded spindle 48 is in the contour insert 38 of the upper
  • Formhtate 34 a shaft-like design core 56 fixedly disposed, which projects slightly with its lower end into the mold cavity 44 to form the countersink 14 a (FIG. 2) of the threaded insert 2.
  • the core 56 sits with some play in the contour insert 38, so that the mold cavity 44 can be vented through the gap between the contour insert 38 and the core 56.
  • a supply for the molten plastic in the form of a manifold 58 and a gate 60 is provided, of which the manifold 58 is formed in the upper mold half 34 and the gate 60 through the mold plate 42 to the lower end of Mold cavity 44 runs.
  • the lower mold half 36 is moved axially downward relative to the upper mold half 34, which is indicated in Fig. 16 by the arrow Xl.
  • the contour insert 38 is rotated relative to the mold plate 37, as indicated by the arrow X2 in Fig. 16. Due to the rotation of the contour insert 38, the threaded insert 2 can thus be pulled axially out of the upper mold half 34.
  • FIG Final state of the peeling operation in which the mold halves 34, 36 are spaced from each other and the threaded insert 2 has completely detached from the upper part 44a of the mold cavity 44.
  • the threaded spindle 48 is now rotated by its (not shown) drive (arrow X3 in Fig. 17), whereby the threaded spindle from the threaded insert 2 spindles (unscrewed) is. However, before the threaded spindle 48 has completely left the threaded insert 2, it comes into contact with a schematically indicated stationary stop 62, whereby a further axial movement of the threaded spindle 48 is prevented. Now, if the threaded spindle 48 is further rotated (arrow X4 in Fig. 18), the threaded insert is axially displaced by this relative rotation between the threaded spindle 48 and the threaded insert 2.
  • the threaded insert 2 can now be pushed by a short axial movement of the threaded spindle 48 from the part 44a of the mold cavity 44, which is indicated by the arrow X5 in Fig.18.
  • the demolding of the threaded insert 2 from the injection mold is now complete, so that the mold halves 34, 36 can be closed again for performing a new injection molding process.
  • Another advantage of the solution according to the invention is that in an injection mold a comparatively large number of mold cavities (Nests) can be provided; possible, for example, up to 60 and more nests in an injection mold, whereby the cost of manufacturing the threaded inserts is improved accordingly.
  • Nests mold cavities
  • FIGS. 19 to 22 For producing and in particular demolding the threaded insert 2 'shown in FIGS. 6 to 8, a correspondingly modified injection mold is provided whose structural design and mode of operation are illustrated in FIGS. 19 to 22.
  • the constructional structure and mode of operation of this injection mold largely corresponds to the exemplary embodiment of FIGS. 15 to 18. Identical components are therefore designated by the same reference symbols and corresponding components by the same reference symbols, provided with an apostrophe. Unless expressly mentioned below, the structural design and mode of operation of the embodiment of FIGS. 19 to 22 are identical to those of the embodiment of FIGS. 15 to 18.
  • the mold cavity 44 is divided between the upper and lower mold halves such that the part 44 'of the mold cavity 44 lying in the contour insert 38' forms the entire part of the threaded insert 2 'provided with the helically extending ribs 16, while in the lower mold half 36 'provided part 44 b' of the mold cavity 44 'merely forms the flange 26.
  • This division of the mold cavity 44 is possible in that the threaded insert 2 'adjacent the conical section 8b has the cylindrical section 8a' which does not hinder axial removal of the threaded insert 2 'from the upper half 37'.
  • FIGS. 19 and 20 show, the distributor 58 'and the distributor section 60 'are both arranged in the contour insert 38' of the upper mold half 34 'above the mold cavity 44'. This is possible because a core 56 is not required.
  • the flats serve 28 (Fig. 6) on the flange 26 of the threaded insert 2 'as a rotation lock, which prevents co-rotation of the threaded insert 2' in the Ausspindelschi the threaded spindle 48.
  • the threaded spindle 48 can be fully unwound from the thread 12 of the threaded insert 2' before the threaded spindle 48 abuts against the stop 62 (Fig. 21).
  • the threaded insert 2 ' can then be lifted by a short axial movement (arrow X4) of the threaded spindle 48 from the lower mold half 36' (arrow X5). This completes the demolding process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un ensemble composé d'une partie support et d'un insert fileté intégré dans la partie support, les deux éléments étant constitués d'une matière thermoplastique. L'insert fileté (2; 2') présente sur sa face extérieure des nervures hélicoïdales (16) dont l'angle du filetage est supérieur à 40°. Une fusion de la matière plastique au moyen de vibrations ultrasonores permet d'intégrer l'insert fileté dans un orifice de réception (6) de la partie support (4) de manière que la matière plastique fondue de la paroi de l'orifice s'écoule à travers les espaces intermédiaires (18) entre les nervures (16) de l'insert fileté. On obtient ainsi un assemblage par complémentarité de forme de type fileté entre la partie support et l'insert fileté. L'invention concerne également un dispositif permettant de fabriquer l'insert fileté.
PCT/EP2008/009824 2007-12-13 2008-11-20 Ensemble composé d'une partie support et d'un insert fileté, procédé de fabrication de l'ensemble et dispositif de moulage par injection de l'insert fileté WO2009074217A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007060081.1 2007-12-13
DE102007060081.1A DE102007060081B4 (de) 2007-12-13 2007-12-13 Anordnung aus Trägerteil und Gewindeeinsatz, Verfahren zum Herstellen der Anordnung und Vorrichtung zum Spritzgießen des Gewindeeinsatzes

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Publication Number Publication Date
WO2009074217A2 true WO2009074217A2 (fr) 2009-06-18
WO2009074217A3 WO2009074217A3 (fr) 2009-09-24

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WO (1) WO2009074217A2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010050221A1 (de) 2010-11-04 2012-05-10 Mann + Hummel Gmbh Langfaserverstärkte Gewindebuchse aus Thermoplast-Kunststoff
CN103158225A (zh) * 2013-04-08 2013-06-19 宁波锦浪新能源科技有限公司 耐高温材料的注塑螺纹孔成型工艺
US20130244207A1 (en) * 2010-11-12 2013-09-19 Sang Choon Cho Mold For Dental Copings And Copings Produced By Using The Mold
CN105235105A (zh) * 2015-10-26 2016-01-13 宁波华朔模具机械有限公司 一种用于斜向管状结构的模具抽芯装置
WO2020169484A1 (fr) * 2019-02-18 2020-08-27 Multimaterial-Welding Ag Procédé d'ancrage d'un premier objet dans un second objet
US11376767B2 (en) 2017-11-30 2022-07-05 Nypromold, Inc. Mechanical interlock pin assembly

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Publication number Priority date Publication date Assignee Title
DE102010050221A1 (de) 2010-11-04 2012-05-10 Mann + Hummel Gmbh Langfaserverstärkte Gewindebuchse aus Thermoplast-Kunststoff
US20130244207A1 (en) * 2010-11-12 2013-09-19 Sang Choon Cho Mold For Dental Copings And Copings Produced By Using The Mold
US9168109B2 (en) * 2010-11-12 2015-10-27 Ebi Co., Ltd. Mold for dental copings and copings produced by using the mold
CN103158225A (zh) * 2013-04-08 2013-06-19 宁波锦浪新能源科技有限公司 耐高温材料的注塑螺纹孔成型工艺
CN105235105A (zh) * 2015-10-26 2016-01-13 宁波华朔模具机械有限公司 一种用于斜向管状结构的模具抽芯装置
US11376767B2 (en) 2017-11-30 2022-07-05 Nypromold, Inc. Mechanical interlock pin assembly
EP3492235B1 (fr) * 2017-11-30 2023-05-24 NyproMold Inc. Ensemble goupille de verrouillage mécanique et procédé de moulage par injection
WO2020169484A1 (fr) * 2019-02-18 2020-08-27 Multimaterial-Welding Ag Procédé d'ancrage d'un premier objet dans un second objet
CN113439166A (zh) * 2019-02-18 2021-09-24 多材料焊接有限公司 将第一物体锚固在第二物体中
US20220136554A1 (en) * 2019-02-18 2022-05-05 Multimaterial-Welding Ag Anchoring a first object in a second object

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