DE3621062C2 - - Google Patents

Description

The invention relates to a method for connecting the ends of two Profile strands made of fiber-plastic composite with an essentially in the longitudinal direction of the fiber orientation, with each of the two ends of the strand to be connected, each at the same angle connecting plane inclined with respect to the strand axis the strand ends are then axially aligned at their connecting planes put together and under pressure and while maintaining the extruded profile shape be connected to each other by gluing or the like. The invention relates also refer to an apparatus for performing such a method.

From the article by E. Heitz, "Repairs to plastic sandwich elements" ("Kunststoff-Rundschau" 1971, Issue 2, pp. 93-100) is a procedure known for local repair of GRP sandwich components, which from applied, impregnated glass fiber fabric or corresponding glass fiber mats exist and are connected to the underlying core material. The purpose of this known method is to damage a GRP sandwich component to restore. The top layer of the concerned GRP sandwich component at the damaged point with a bevel provided from the surface of the top layer to the core material runs and a correspondingly tapered transition between trains both. This is intended to prevent dangerous concentrations of pollution through an abrupt transition in mutually perpendicular planes can occur as far as possible due to the tapered surface be avoided. By appropriate addition of missing core material and applying pre-laminated pieces of fabric to the top of the Laminate into the area of the conical transition as well as through  pure application and pressing of the pre-laminated fabric pieces against the conical bevel as well as subsequent hardening can be the desired local repair. This known method leads to one End product of good appearance, in which the top layer is detached from the Core layer is avoided, and is particularly useful for local repairs passing through the top layers of such sandwich constructions Holes, honeycomb damage, broken cover layers (also with core damage) or the like applicable. After the matrix mass has hardened, the last step is at the known method the repaired point by grinding the Adjusted original cover layer.

Even if the known method for the local repair of GRP sandwich components is very suitable, however, it shows for the manufacture of a tensile Connection of two strand ends from profile strands Fiber-plastic composite is not a good suitability.

In the brochure SPORTEX-GFK-Profiles different possibilities for the connection of two strand ends to each other (if only in very principle representation) shown. The one shown there Connection procedure is on each of the two ends of the strand to be connected each inclined at the same angle relative to the strand axis running connecting plane attached, after which the strand ends axially aligned with each other at their connection levels and under pressure and while maintaining the extruded profile shape (by means of a mechanical retaining tab) be connected to each other by gluing or the like. Details on however, the connection procedure cannot be found in this prospectus.

The invention is based on the object, a method of the beginning mentioned type for the production of a tensile connection of two To indicate strand ends to each other, which is a reliable even with strong curvature Guaranteed preservation of the connection created and in particular the risk of unwanted splitting off of the delamination of fibers in the Connection area is effectively avoided.

According to the invention, this is done in a method of the type mentioned at the beginning  solved by the features of the characterizing part of the main claim.

A strand connection is achieved by the method according to the invention, even under strong bending stress and curvature in the connection area is preserved and even the radii of curvature of only one hundredth of the strand diameter allows, without breaking or Removal of fibers from the strand bandage or for delamination of Fibers come from the matrix.

In the method according to the invention, it is advisable to use the strand ends Form the inclined connection planes so that the Connection levels with the lowest possible inclination against the strand axis are available. This does not only result in one of the slight inclinations correspondingly large, heavy-duty connection, but also the Advantage that there at any point in the connection level outgoing fiber ends through the two sides of the connection level immediately neighboring fibers of the other strand end overlap relatively far because the ends of these fibers in the connection plane along the Strand axis offset from one another in one direction or the other are, the flatter the connection plane is inclined. This allows a high Dislocation and overlap ratio of the fiber ends of the two strand ends in the connection level, that is when connecting the strand ends leads to the fact that fiber to fiber in the connecting plane Matrix is pressed and the direct butt joint of the fiber ends then only plays a subordinate role due to the matrix material that the fibers cannot delaminate as a result. For the ends of the lying outside in the peripheral surface of the extruded profile and therefore no longer Such delamination is overlapped by the profile circumference wrapping around thin coat very reliably prevented, even when Curvatures of the connection area with very small radii of curvature.

A fabric tape whose width is greater is preferably used as the jacket than the extruded profile circumference and that in the direction of its width around one wind looped the extruded profile as well as its excess two edge strips to form a wing projecting from the extruded profile  which is removed after connecting the strand ends or is trimmed. Of course, the length of the fabric tape covers it the entire connection area, is longer than that Extension of the connection plane in the longitudinal direction of the strand. The only single wind Wrapping around the connection area is sufficient, flaking off the outer area To prevent edge layers of the strand ends in the connection plane, and them on the other hand enables the application of the fabric tape at the ends of the strands in a particularly simple way. A fabric tape is particularly preferred Glass fiber tape is used.

Another, particularly advantageous embodiment of the invention The method also consists in that the strand ends are connected to one another and to the Jacket to be connected under heating.

The one particularly preferred for carrying out the method according to the invention The device comprises at least one peeling bed, a peeling plane and therein has a fixing groove for the end of the strand to be peeled, axially on one open end with a groove depth of at least equal to the profile height of the in Fixing groove inserted strand end begins and to the other groove end becomes flatter under a constant inclination and finally there in the Schälee runs out at least the same length as that at the end of the strand has to be produced connection level and is designed in the profile so that the strand end inserted into the fixing groove transversely to the strand axis both in Direction parallel to the bowl level, as well as perpendicular to it in the depth direction is completely fixed in position and none except upwards out of the fixing groove possesses further possibility of movement. It also includes two feasible strand holder with one receptacle in each of which one of the Strand ends outside the connection plane axially and around the strand axis is rotatably clamped, and a two-part mold, which in Closing state has a mold space open at both ends, which after Length and profile of those joined at their connection levels and from Sheath wrapped strand ends corresponds. Finally, the invention Device also positioning devices that the Relocate the strand holder between the peeling bed and the mold  Allow predetermined fixed positions, namely on the peeling bed before axially open deep end of the fixing groove and on the mold in front of both Ends of the molding space, the receptacles each with the fixing groove or axially align the mold space and at least one of the strand holders between its positions on the peeling bed and on the mold by 180 ° around the axis its shot is rotated.

The device according to the invention makes it possible on the one hand with its Peeling bed, the strand end along the peeling level in the fixing groove for the Specify the peeling process exactly and with one along the peeling level guided peeling tool the connection level at the end of the strand very precisely manufacture, and this even with an extremely low inclination of Connection plane in relation to the strand axis because the inclination is relative as small as desired between the fixing groove and the peeling level on the peeling bed can be chosen. On the other hand, the device according to the invention can be used their implementable strand holders in a simple and quick manner Join the ends of the strands with one another precisely aligned Connection levels in the press mold, namely by only one of the strand holder when moving from the peeling bed to the mold 180 ° around the strand axis is turned. By dividing the mold into two can implement Strand holder the strand ends are comfortably inserted into the molding space while doing so can also be wrapped around with the coat. The molding space guarantees closed mold, compliance with the extruded profile also in the connection area, focusing primarily on the strand ends and shaping the coat. Because the shots in the strand holders each aligned axially in alignment with the fixing groove or the molding space the strand ends held in the recordings with a straight strand axis, so without bending, protrude into the fixing groove or the molding space, what is important because each bend the exact shape of the connection planes and the Quality of the final connection.

The peeling bed and the press mold are preferably arranged in a frame, which has seats as positioning devices, which the strand holder form-fit and thereby their position in relation to the peeling bed and determine the mold. It is useful for the peeling bed and the mold  a common frame is provided in which the peeling bed and the Press mold with a molding space running essentially parallel to the fixing groove are arranged side by side. Then the strand ends can change direction transferred parallel to itself from the peeling bed into the mold will.

In the case of geometrically complicated profile shape of the strands one is for each of the two ends of the strand provide their own peeling bed, to which the profile of the Fixing groove of the profile surface of the respective strand end with which it is in the Fixing groove lies, is adjusted as precisely as possible. But are these profile surfaces on the two ends of the strand are the same, as is the case, for example, with a circular strand profile is always the case or in the case of an oval extruded profile through a suitable position of the Connection level can be easily set up, so it is advantageous if only a single peeling bed is provided and this between two fixed positions can be implemented in which the axially open end of the fixing groove in each other shows opposite directions, the positioning means the Position the strand holder in front of the peeling bed in its two positions allow. This allows the first strand end in one, the second strand end in the other position of the peeling bed with the connection level will.

Preference is also given to peeling off the strand end of a peeling tool provided, the peeling blade is in a management level, which in The peeling direction follows behind the peeling cutting edge and with that the peeling tool on the peeling level of the peeling bed. The management level is, of course at the end of the strand also on the leading peeling edge cut connection level so that it has a hold-down function exerts the strand end and prevents this in the course of the peeling process raised by the cutting forces on the peeling edge in the fixing groove or can even be lifted out of the fixing groove.

The mold is particularly preferred in the device according to the invention trained heatable.

The invention is described below in principle by way of example with reference to the drawing  explained in more detail. It shows

Figs. 1 to 3 each show a plan view of the device in three successive process steps;

Figures 4 to 6 each the section IV-IV, VV, VI-VI in Figures 1 to 3.

Figures 7 to 9 each section VII-VII, VIII-VIII, IX-IX in Figures 1 to 3.

FIG. 10 is a longitudinal section through the excessive peel bed along the line XX in Fig. 1;

Fig. 11 is a top view of the subject of Fig. 10;

FIG. 12 is a peeling tool in cross section;

FIGS. 13 and 14 is an axial section perpendicularly to the connection plane and a cross section through the connecting region of two strand ends, and the

FIG. 15 shows the object of FIG. 14 before trimming the jacket that wraps around the connection area.

As shown in FIGS. 13 and 14, the connection of two strand ends 1.1 , 1.2 of a support element for fiber optic cable is carried out in wesent union in that the two fiber composite material with existing in the direction of the strand axis 1.3 fiber course strand ends, each with one under very flat inclination against the strand axis 1.3 and therefore correspondingly long connection level 2 provided, joined together at these connection levels 2 , common sam outside still wrapped by a thin fabric jacket 3 , in particular glass fabric and then by gluing or the like under pressure, possibly also under heat, while maintaining the shape of the extruded profile. The extremely weak inclined course of the connecting plane 2 has the result that in Fig. 13 each in the connecting plane de fiber end is overlapped by just above or below the fibers of one or the other strand end 1.1 , 1.2 , because the ends of these fibers in the connection level are offset or set back from each other, the lower the connection level 2 is inclined to the line axis 1.3 . The fabric jacket 3 ensures that the fibers lying in the profile circumferential surface of the strand ends 1.1 , 1.2 in the area of the connecting surface 2 of both profile ends in the shaft cannot split or delaminate from each other if the support element is bent in the area of the connection.

The device shown in FIGS. 1 to 12 is used to perform such strand connections in support elements for optical fiber cables in an economical manner. The device initially comprises a peeling bed 4 , which has a ground and hardened peeling plane 5 and in this a fixing groove 6 for the strand end 1.1 , 1.2 to be provided with the connecting plane 2 . The fixing groove 6 has within the peeling layer 5 is at least the same length as that produced at the end of the strand connecting plane 2 and is formed in the profile such that the in their lying de strand end 1.1, 1.2 both in the direction parallel to the peeling layer 5 transversely to the strand axis 1.3, as well as completely perpendicular to it in the depth direction is fixed and apart from upwards out of the fixing groove 6 has no further possibility of movement or evasion. The fixing groove 6 begins at the end of a peeling bed with an axially open section 6.1 and a groove depth which is at least equal to the full profile height of the strand ends 1.1 , 1.2 in the fixing groove 6 , but gradually becomes flatter from there along the peeling plane 5 until it reaches the Schälee 5 expires at 6.2 upwards. The peeling level 5 therefore results in an inserted into the fixing groove 6 strand end 1.1 , 1.2 in this an imaginary penetration that corresponds exactly to the connec tion level 2 with which the strand end is to be provided. So is a peeling tool 8 ( Fig. 12) on the shaving plane 5 along the fixing groove 6 from its deep section 6.1 going in the direction of arrow 7 over the strand end 1.1 , 1.2 located in the fixing groove 6 to the flat end in the shaving plane end 6.2 of the fixing groove 6 , the end of the strand is cut and peeled off with the fiber (ie not against the fiber) and the connecting plane 2 is formed on it. Since the inclination of the fixing groove 6 can be chosen arbitrarily small relative to the shaving plane 5 , the connection plane 2 can be made at the end of the strand with a very large length accordingly, without the end of the strand in the fixing groove 6 being able to move sideways or in depth if it is cut or peeled.

The peeling bed 4 is held in a frame 9 on a traverse 9.1 , on which it can be implemented between two positions, one of which is shown in FIG. 1, the other in FIG. 2. To fix the peeling bed 4 in its respective position, lateral cheeks 9.2 on the crossmember 9.1 and Paßstif te 9.3 , which grasp in the associated fitting holes 4.1 of the peeling bed 4 . In the two positions of the peeling bed 4 on the crossbeam 9 made possible in this way , the deep section 6.1 of the fixing groove 6 shows in another opposite direction, namely in FIG. 1 upwards, in FIG. 2 downwards. The fitting holes 4.1 are in the longitudinal direction of the fixing groove 6 exactly in the middle between the flat end 6.2 of the fixing groove 6 and the beginning 6.3 of the shaving plane 5 at the deep Rillenab section 6.1 , which has the consequence that when turning the peeling bed 4 between its two positions the traverse of the beginning 6.3 of the peeling plane 5 in one position comes exactly to the place of the flat fixing groove end 6.2 in the other position and vice versa. In both positions of the peeling bed 4 is in front of the deep section 6.1 of the fixing groove 6 in a position that is precisely specified with respect to the peeling bed 4 at the position 9 Ge, a strand holder 10.1 , 10.2 can be attached, which has a receptacle 11 , in each of which the strand ends 1.1 , 1.2 outside of the area of the connection plane 2 can be clamped and tightened in a rotationally fixed manner around the strand axis 1.3 between jaws 12 by means of clamping screws 13 . To fix their positions on the frame 9 , the strand holders 10.1 , 10.2 are provided with fitting bores 14 in both jaws 12 , into which fitting bolts 15 engage, for which nut threads 15.1 are suitably attached to the frame 9 . As a result, there is the possibility to arrange the strand holder 10.1 , 10.2 on the frame 9 optionally in one or the other of two positions, which differ by rotating the strand holder about the axis of the receptacle 11 by 180 ° each.

In addition, the device includes a two-part, optionally heatable mold 16 , the parts 16.1 , 16.2 together form a mold space 17 in the closed state of the mold, which according to profile shape and length of the shape of the two joined in the connecting plane 2 and with the fabric jacket 3 to loop ends 1.1 , 1.2 corresponds. The mold 16 is in the embodiment via a heating plate 20.1 in the frame 9 fixedly arranged on a cross member 9.4 , and for heating the upper mold part 16.2 , after closing the mold by means of clamping screws 21, an upper heating plate 20.2 can be folded, which is articulated at 20.3 is mounted on the frame 9 . The strand holder 10.1 , 10.2 can be set in the manner already described in connection with the peeling bed 4 on the frame 9 in front of both ends of the mold space 17 outside the mold 16 in a fixed predetermined position relative to the mold 16 . In all cases, the receptacles 11 of the strand holders 10.1 , 10.2 are axially exactly aligned with the forming space 17 or with the fixing groove 6 , so that the strand ends 1.1 , 1.2 clamped in the receptacles 11 without bending their strand axis 1.3 into the fixing groove 6 or Projecting mold space 17 .

For producing the compound the first strand end 1.1 (Fig. 1) clamped in the string holder 10.1 and this on the frame 9 in front of the peel bed 4 stated above, so that the rope end 10.1 is no curvature in the fixing groove 6 in the peel bed 4. If the strand end 1.1 is peeled and its connec tion level 2 is produced, it is removed from the frame 9 with the stranghal ter 10.1 without releasing its jamming, rotated by 180 ° about the axis of the strand and converted to the open mold 16 on the frame 9 . Now the peeling bed 4 is accordingly Fig. 2 implemented on the cross member 9 and the second strand holder clamped below in the second strand 10.2 second strand end 1.2 in a corresponding manner provided with the connecting plane 2 and on the frame 9 to the die 16 sets, without in this case however, to be turned around the strand axis. This peeling and order to set the two strand ends 1.1 , 1.2 between the peeling bed 4 and the die 16 in their own strand holder 10.1 , 10.2 has the result that the orientation of the connec tion levels of both strand ends is determined and determined extremely precisely without further action in the die is, so both connection levels 2 are parallel in the mold space 17 opposite and touching to collapse, resulting in elaborate work th for precise mutual alignment of the strand ends in the mold 16 are avoided. - Before inserting both strand ends 1.1 , 1.2 into the mold 16 , the fabric jacket 3 is placed in the open mold space of the lower molded part 16.1 , which - even if the strand ends 1.1 , 1.2 are both inserted into the mold space 17 - around the strand ends beaten around and the position is held in its wrap the connection by closing the mold 16 . Is the connection in the mold 16 completed, the two according to Fig. 15 projecting beyond the extruded profile edges 3.1 of the fabric jacket 3 after opening the mold 16 and the removal of the interconnected strand ends cut, trimmed or otherwise removed.

The peeling tool 8 is formed in the exemplary embodiment according to FIG. 12 with two peeling blades 8.1 and is provided with a guiding plane 8.2 that always follows the peeling blades 8.1 in the cutting direction, with which it can be guided lying on the peeling level 5 of the peeling bed 4 and the end of the strand on the already cut Holds down part of the connection level 2 in the fixing groove 6 .

Claims (10)

1. A method for connecting the ends of two profile strands made of fiber-plastic composite material with a fiber course oriented essentially in the longitudinal direction of the strand, wherein a connecting plane inclined relative to the strand axis is attached to each of the two strand ends to be connected, the strand ends then axially aligned with each other at their connecting planes and connected to one another by pressure or while maintaining the extruded profile shape by gluing or the like, characterized in that each extruded strand is unilaterally connected to the strand end to be connected from the full profile shape with the fiber course in the direction of the strand end up to Formation of the inclined connection plane is peeled off, the strand ends are wrapped together with a thin sheath after they have been placed against one another and are finally joined to one another under pressure and to the sheath in a material-locking manner. 2. The method according to claim 1, characterized in that as a jacket Fabric tape is used, the width of which is greater than the circumferential profile circumference is and winded around the strand profile in the direction of its width as well as with its excess two marginal strips a profile wing projecting from the extruded profile is folded together is removed or trimmed after connecting the strand ends. 3. The method according to claim 2, characterized in that as a fabric tape a fiberglass tape is used. 4. The method according to any one of claims 1 to 3, characterized in that the ends connected to each other and to the jacket with heating will. 5. Apparatus for performing the method according to one of claims 1 to 4, characterized by at least one peeling bed ( 4 ) having a peeling plane ( 5 ) and therein for the strand end to be peeled ( 1.1 , 1.2 ) a fixing groove ( 6 ) starts at one axially open end 6.1 with a groove depth at least equal to the profile height of the strand end ( 1.1 , 1.2 ) to be inserted into the fixing groove ( 6 ), becomes flatter towards the other groove end ( 6.2 ) with a constant inclination, finally there in the shaving plane ( 5 ) runs out at least the same length as the connecting plane ( 2 ) to be produced at the end of the strand and is designed in the profile so that the strand end ( 1.1 , 1.2 ) inserted in the fixing groove ( 6 ) transversely to the strand axis ( 1.3 ) both in the direction parallel to the shaving plane ( 5 ) and perpendicular to it in the depth direction is completely fixed in position and apart from upwards out of the fixing groove ( 6 ) there is no possibility of movement ability, also by two convertible strand holders ( 10.1 , 10.2 ), each with a receptacle ( 11 ), in which one of the strand ends ( 1.1 , 1.2 ) outside the connecting plane ( 2 ) can be axially pulled and rotatably clamped about the strand axis ( 1.3 ) is further characterized by a two-part mold ( 16 ), which in the closed state has a mold space ( 17 ) open at both ends, which according to length and profile is joined to the strand ends ( 1.1 , 1 ), which are joined in their connecting planes ( 2 ) and wrapped by the jacket ( 3 ). 1.2 ), and by means of positioning devices ( 9 , 9.1 , 4.3 , 9.3 , 14 , 15 ) which enable the strand holders ( 10.1 , 10.2 ) to be moved between the fixed positions specified with respect to the peeling bed ( 4 ) and the press mold ( 16 ) , namely on the peeling bed ( 4 ) in front of the axially open deep end ( 6.1 ) of the fixing groove ( 6 ) and on the press mold ( 16 ) in front of both ends of the molding space ( 17 ), the receptacles ( 11 ) each having the fixing groove ( 6 ) or the mold space ( 19 ) axially aligned and at least one of the strand holders ( 11.1 or 11.2 ) between its positions on the peeling bed ( 4 ) and on the press mold ( 16 ) is rotated by 180 ° about the axis of its receptacle ( 11 ). 6. The device according to claim 5, characterized in that the peeling bed ( 4 ) and the press mold ( 16 ) are arranged in a frame ( 9 ) which has as positioning devices seats ( 14 , 15 ) which the strand holder ( 10.1 , 10.2 ) Take a positive fit and thereby determine their position in relation to the peeling bed ( 4 ) and the mold ( 16 ). 7. The device according to claim 6, characterized in that the peeling bed ( 4 ) and the press mold ( 16 ) a common frame ( 9 ) with the fixing groove ( 6 ) substantially parallel mold space ( 17 ) are arranged side by side. 8. Device according to one of claims 5 to 7, characterized in that only a single peeling bed ( 4 ) is provided and this can be implemented between two fixed positions in which the axially open end ( 6.1 ) of the fixing groove ( 6 ) in mutually opposite directions shows, and that the positioning devices ( 14 , 15 ) allow the application of the strand holder ( 10.1 , 10.2 ) in front of the peeling bed ( 4 ) in its two positions. 9. Device according to one of claims 5 to 7, characterized in that a peeling tool ( 8 ) is provided for peeling off the strand end, the peeling edge ( 8.1 ) of which lies in a guide plane ( 8.2 ) which follows in the peeling direction behind the peeling edge ( 8.1 ) and with which the peeling tool ( 8 ) is guided on the peeling plane ( 5 ) of the peeling bed ( 4 ). 10. Device according to one of claims 5 to 9, characterized in that the mold ( 16 ) is heatable.