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WO2015071336A1 - Procédé de tressage et structure tressée - Google Patents

Procédé de tressage et structure tressée Download PDF

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Publication number
WO2015071336A1
WO2015071336A1 PCT/EP2014/074419 EP2014074419W WO2015071336A1 WO 2015071336 A1 WO2015071336 A1 WO 2015071336A1 EP 2014074419 W EP2014074419 W EP 2014074419W WO 2015071336 A1 WO2015071336 A1 WO 2015071336A1
Authority
WO
WIPO (PCT)
Prior art keywords
leg
braiding
threads
group
braided
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP2014/074419
Other languages
German (de)
English (en)
Inventor
Simon Küppers
Johannes THUMM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF
Original Assignee
Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF
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
Publication date
Application filed by Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF filed Critical Deutsche Institute fuer Textil und Faserforschung Denkendorf DITF
Priority to DE112014005186.1T priority Critical patent/DE112014005186A5/de
Publication of WO2015071336A1 publication Critical patent/WO2015071336A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C3/00—Braiding or lacing machines
    • D04C3/40—Braiding or lacing machines for making tubular braids by circulating strand supplies around braiding centre at equal distances
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
    • D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
    • D04C1/06—Braid or lace serving particular purposes
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/03—Shape features
    • D10B2403/033—Three dimensional fabric, e.g. forming or comprising cavities in or protrusions from the basic planar configuration, or deviations from the cylindrical shape as generally imposed by the fabric forming process
    • D10B2403/0333—Three dimensional fabric, e.g. forming or comprising cavities in or protrusions from the basic planar configuration, or deviations from the cylindrical shape as generally imposed by the fabric forming process with tubular portions of variable diameter or distinct axial orientation
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/02—Reinforcing materials; Prepregs

Definitions

  • the invention relates to a method for braiding a structure having at least a first leg, a second leg and a third leg.
  • the first leg, the second leg and the third leg are from a branching point.
  • the invention further relates to a braided structure.
  • a core is braided, which predetermines the appearance of the later structure.
  • the core may be water-soluble, for example, so that it can be removed from the structure again after completion of the braiding process.
  • Braided structures made in this way can be used, for example, for bicycle frames, vascular prostheses, car body parts, or other applications where it is typically important to achieve high strength with as little weight as possible.
  • the generic method for braiding it is customary for one of the three legs to be braided initially, wherein a second of the legs is subsequently braided, which is then braided again in the opposite direction, and then the last of the three legs is braided.
  • Such methods are known and established in the art. However, they result in one of the three legs being double-braided, which causes additional material consumption and also leads to a higher total weight, while on this leg usually no increased strength requirement is observed.
  • Insofar - based on the desired end product - an excessive use of material not fair flow rate fair fiber course accepted, since in generic methods for braiding no technique is known with which this could be avoided.
  • the invention relates to a method for braiding a structure having at least a first leg, a second leg and a third leg, which protrude from a branch point.
  • the method comprises the following steps: - single braiding of the third leg with at least a first group of braiding threads and a second group of braiding threads, then
  • the method according to the invention makes it possible to carry out only one braiding process in one direction along all three legs.
  • On the double Kochfleraum at least one leg can be dispensed with. This avoids unnecessary material being consumed for this leg and hence weight being increased, although no increased strength requirements are placed on this leg.
  • This is made possible in the method according to the invention for braiding in that the braiding threads are divided into the two groups mentioned, wherein both groups of braiding threads are associated with the third leg, while only one of these two groups of braiding threads is associated with the first leg and the second leg assigned.
  • the first group of braids is associated with a first semicircle of bobbins, further wherein the second group of braids is associated with a second semicircle of bobbins, the first semicircle and the second semicircle being complementary to each other and adjoin one another at a first division point and at a second division point.
  • each bobbin is associated with a braid.
  • clappers may be present to which no braid is assigned.
  • a braiding with less braiding threads than in the braiding machine can be achieved to the maximum extent possible, for example to produce smaller structures.
  • the two semicircles are preferably complementary to one another, which means that together they form a closed circle. The two boundaries between the semicircles are called division points.
  • the first leg is braided with the first group of braiding threads and a third group of braiding threads.
  • the first and the second group of braiding threads are present, but additionally also at least a third group of braiding threads.
  • the method according to the first embodiment is particularly advantageously applicable if the first leg, the second leg and the third leg are to be made similar or identical, in particular with respect to their respective diameters, and / or if respective angles between the legs are approximately or exactly should be the same.
  • the second leg is braided with the second group of braiding threads and the third group of braiding threads.
  • each of the three legs can be braided with two groups of braiding threads, which is a similar or identical one Training the leg easier and advantageous in terms of a kraftflußg led fiber guide in the gusset and in terms of closing the gusset.
  • the first leg, the second leg and the third leg are formed radially symmetrical, wherein a braiding angle when braiding a respective leg is preferably in each case 30 °.
  • the radial symmetrical design is particularly advantageous in the first embodiment of the method because the method in the first embodiment, as mentioned above, facilitates a similar or identical design of the respective legs and allows the best course with regard to a force-guided fiber guide ,
  • a braiding angle is understood to be that angle which the braiding thread assumes during braiding to an axis extending parallel to the respective extension of the respective leg.
  • a braid angle of 30 ° allows in the mentioned embodiment, an identical design of all three legs, since a respective braid can leave a respective leg using this braid angle at the same angle in which it enters another leg.
  • the method further comprises a step of braiding a fourth leg formed between the first leg and the second leg, wherein the first leg, the second leg, the third leg and the fourth leg are formed radially symmetrical to each other, wherein the fourth leg is braided with the third group of braiding threads and a fourth group of braiding threads, wherein the second leg is braided with the second group of braiding threads and the fourth group of braiding threads.
  • a braiding angle when braiding a respective leg is preferably 45 ° in each case.
  • the inventive method according to the first embodiment particularly advantageous for braiding a Structure with four legs are used, and it is even more advantageous particularly applicable when all four legs should be the same design.
  • the mentioned braiding angle of 45 ° is advantageous because in this case a respective braid thread leaves a respective leg at the same angle in which it enters another leg.
  • the method further comprises a step of braiding a fourth leg which is formed between the first leg and the third leg, and further comprises a step of braiding a fifth leg which is between the second leg and the third leg, wherein the first leg, the second leg, the third leg, the fourth leg and the fifth leg are formed radially symmetrical to each other, wherein the second leg is braided with the second group of braiding threads and a fourth group of braiding threads wherein the fifth leg is braided with the third group of braiding threads and a fifth group of braiding threads, wherein the fourth leg is braided with the fourth group of braiding threads and the fifth group of braiding threads.
  • a braiding angle when braiding a respective leg is in each case 18 °.
  • the described embodiment of the method according to the invention according to the first embodiment is particularly preferably applicable to the production of a structure with a total of five legs, which should be designed similar or identical, in particular with respect to their diameter.
  • the mentioned braid angle of 18 ° allows a respective braid thread to leave a respective leg at the same angle at which it enters a respective other leg. This facilitates the formation of a radial symmetric structure in which all five legs are to be identical or similar, and / or of spatial structures.
  • the respective limbs in particular at least the second limb, the third limb and optionally further limbs, such as the aforementioned fourth limb and fifth limb, braided starting from the branch point.
  • the third leg can also be braided from the outside in the direction of the branching point.
  • braiding angles up to 90 °, in particular from 25 to 60 ° can basically be realized both according to the first embodiment and also according to the second embodiment.
  • all groups of braiding threads can each have the same number of braiding threads. This facilitates the formation of a structure with at least partially identical or similarly formed legs. In addition, the handling of the braiding threads on the braiding machine is simplified.
  • At least one group of braiding threads for example at least the first, second, third or any additional group, such as the aforementioned fourth or fifth group of braiding threads or a subset of braiding threads, for example subgroups 1 a , 1 b, n a or n b described below, contains a number of braiding threads different from the respective number of braiding threads of one or more other groups of braiding threads.
  • the respective groups of braiding threads in particular the first, second and third group of braiding threads and optionally further groups of braiding threads, such as the previously Considered fourth and fifth group of braided threads, each containing a different number of braiding threads.
  • the third group of braiding threads may have more or fewer braiding threads than the first group of braiding threads and / or the second group of braiding threads.
  • the number of braiding threads in one group of braiding threads is smaller than the number of braiding threads in two other groups together.
  • the number of braiding threads in the first group may be smaller than the number of braiding threads in the second and third groups together.
  • structures can be braided, in which the first and the third leg are identical, and the second leg deviates from this.
  • the number of braiding threads in the second group may be smaller than the number of braiding threads in the first and third groups together.
  • the number of braiding threads in the third group may be smaller than the number of braiding threads in the first and second groups together.
  • the respective groups of braiding threads in particular at least partially, contain different braiding threads.
  • braid threads may be included, which are not included in the third group.
  • braiding threads may be included that are not included in the first group.
  • the method further comprises respective steps of braiding n-3 further legs in addition to the first leg, the second leg, and the third leg, where n is greater than or equal to five.
  • the legs are formed radially symmetrical to each other.
  • Each leg is braided with a group of braiding threads, with which the thigh after next in the clockwise sense is braided. He is also braided with another group of wicker threads, with which also the thighs next to the clock are braided.
  • This embodiment leads to five or more legs to a particularly advantageous stability.
  • respective non-braided sections of braiding threads are at the branching point of the already braided part of the structure. These can then be used in subsequent braiding legs.
  • unbroken portions of the braiding threads of the third group of braiding threads stand out of the already braided part of the structure and are used only during braiding of the last leg. Under the last leg is understood in particular the last braided leg.
  • the inventive method in particular according to the first embodiment, can also be formulated in a different terminology. In this case, individual steps of a method for braiding a structure with a number of n + 1 legs can be designated as follows:
  • the threads of subgroup n conceptually in length in a braided part (subgroup n a ) and an unwound part (subgroup n b ), merging the braid threads of subgroup n b and the braiding threads of subgroup 1 b ,
  • Subgroup 2 Third Group By dividing groups into subgroups, or the use of several groups, which is already described above in other terminology, is technically most equal, a force-flow connection of legs is achieved.
  • Legs can be connected, for example, with one leg in each case in the clockwise direction and one leg adjacent in the counterclockwise direction. They may also be connected, for example, with a second leg which is clockwise in the clockwise direction and a leg which is after the second counterclockwise. It has been shown that in particular a power flow-oriented fiber guidance in the gusset and an advantageous closing of the gusset are possible.
  • the first leg is braided exclusively with the first group of braiding threads
  • the second leg is braided exclusively with the second group of braiding threads.
  • the third leg for example, larger, in particular with a larger diameter, to be formed as the first leg and the second leg.
  • Such structures occur in particular when the structure is to be Y-shaped, that is to say if it is to have, for example, an angle between the first and the second leg, which is smaller than the respective angle between the first leg and the third leg or between them second leg and the third leg.
  • the first group of braiding threads and the second group of braiding threads each have the same number of braiding threads. This is particularly advantageous if the first leg and the second leg are to have an identical or similar extent, for example diameter. If different values are desired for the thicknesses of the first leg and the second leg, correspondingly different amounts of braiding threads may also be provided in the first group of braiding threads and the second group of braiding threads.
  • the braiding threads of the second group are cut off after the step of braiding the third leg at respectively associated bobbins. They remain in a storage state during the first leg braiding step and are re-attached to one cleat prior to the second leg braid step, preferably by knotting.
  • the braiding machine used is allowed to work exclusively with the braiding threads of the first group during the braiding of the first leg.
  • the cut braid threads are stored so that their previous assignment to the respective bobbins still remains recognizable. For example, they can be provided with appropriate markings. They can also be fastened to a specially provided apparatus, for example a correspondingly designed board with holders.
  • the braiding threads of the second group are again attached to a respective clapper. This makes it possible to braid the second leg after braiding the first leg.
  • the braiding threads of the second group can be removed after the step of braiding the third leg together with the associated bobbins.
  • the clappers may remain in a parked position on the braiding machine used.
  • the braiding threads of the first group are preferably cut off after the step of braiding the third leg and before the step of braiding the first leg on respectively associated bobbins and are re-attached to each one bobbin. Also in this case, the fastening is preferably done by knotting.
  • the trimming of the braids of the first group makes it possible to re-attach these braids to bobbins that are more suitable for braiding the first leg than those clasps to which they were attached during the braiding of the third leg. This can be prevented, for example, that forms a patchy mesh, which may arise, for example, when the braid threads of the first group are left at the already mentioned above bobbins of a semicircle.
  • Advantageous embodiments for the selection of bobbins to which the braiding threads can be fastened again will be described below.
  • respective braiding threads associated with bobbins whose distance to the nearest division point is less than a certain maximum value are crossed, such that after the crossing step they are associated with a clapper whose distance from the other of the two divisional points is less than the maximum value and which belongs to the respective other semicircle, the maximum value preferably having a value of two.
  • Crossing over advantageously ensures that braid threads are also present at the gusset, that is to say at the point at which the first and second legs typically collide on one side facing away from the third leg. This prevents the formation of an area which is not covered by braiding threads. For example, such an area could result in a final product having the braided structure having a hole through which moisture may undesirably penetrate or which may affect the stability of the entire structure.
  • the crossing over is preferably carried out in such a way that, after the crossing over, a number of braiding threads runs through the gusset.
  • the distance between a bobbin and the nearest dividing point is assumed to be the number of bobbins which are located between the respective dowel for which the distance is to be determined and the division point. If, for example, the second bobbin after a division point, a bobbin is arranged between this bobbin and the division point, so that the distance has a value of 1. This value is smaller than the preferred value of 2. The maximum value of 2 has been found to be advantageous because for most structures sufficient coverage of the gusset is ensured while at the same time not interfering too much with the overall structure.
  • the braiding threads are diagonally crossed in such a way that a respective braiding thread, which before this step was associated with a clapper having a distance of n clappers from the next divisional point, is assigned after this step to a clapper which has a cleavage Distance from the other of the two division points, which is the maximum value minus 1 and minus n.
  • This may mean, for example, that in the step of crossing the relative arrangement of the braiding threads is maintained to each other, but in total is reversed.
  • a braid which, prior to the crossing step, was at a high distance from the nearest divisional location is closer to the then nearest divisional location after the crossing step. This procedure has proven to be advantageous insofar as a particularly good coverage of the gusset is achieved.
  • the braid threads of a respective group are fastened to bobbins which belong to one of a plurality of bobbin groups, wherein all bobbin groups have an identical number of bobbins, preferably four bumps
  • bobbins which belong to one of a plurality of bobbin groups
  • all bobbin groups have an identical number of bobbins, preferably four bumps
  • the braiding threads can be advantageously distributed over the entire braiding machine. This allows uniform braiding of both the first leg with the first group of braiding threads as well as the second leg with the second group of braiding threads.
  • the mentioned value of four bobbins having a respective group of bobbins and the mentioned value of four bobbins, by which respective bobbin groups are spaced from each other, have proved advantageous for most applications. It should be understood, however, that other values may be used herein.
  • attaching a braiding thread to a clapper can also mean that it is not cut off at all (or removed along with its associated clapper) and, accordingly, not fastened again.
  • the method according to the invention can be used particularly preferably for braiding a structure of a bicycle frame. It has been shown that the advantageous properties are particularly important here. This concerns in particular the high stability with low weight. It can be used on all described versions and variants.
  • process steps described in accordance with a respective embodiment may be performed in the order indicated. However, they can also be performed in a different order, if technically possible. Respective described methods can also be carried out in such a way that no further steps are carried out.
  • the invention further relates to a braided structure which is produced by means of a method according to the invention.
  • a braided structure has particular advantages in terms of its weight, in particular because it can be dispensed with the double braiding at least one leg. In this way it is possible to realize a thread flow pattern with reduced weight.
  • all variants which have been described with reference to the process according to the invention can be used.
  • the invention relates to a braided structure having at least a first leg, a second leg and a third leg, which project from a branching point.
  • the braided structure according to the invention is characterized in that the legs each have no multiple, in particular no double, braiding layers.
  • the braided structure is characterized in particular by the fact that none of the legs is multiply, in particular double, over-braided. This applies in particular also to optional additional legs, as for the aforementioned fourth and fifth leg. Due to the absence of braided thighs, a flow pattern which is suitable for the force flow can be realized with a reduced weight even with this braided structure.
  • a braided structure according to the invention is particularly preferably a structure of a bicycle frame. This can be further processed, for example, by impregnation with suitable substances and curing to a stable and lightweight bicycle frame.
  • 4 is a diagram of a classification of braiding threads to respective bobbins before braiding a leg with only one group of braiding threads
  • 5 schematically shows a structure which is in an intermediate state in a production by means of the second embodiment of the method
  • FIG. 7 shows schematically a structure braided with a method according to the first embodiment
  • Fig. 8 shows schematically another according to a method according to the first
  • FIG. 9 schematically yet another with a method according to the first
  • Embodiment braided structure Embodiment braided structure.
  • FIGS. 10-13 show states in a method of manufacturing the structure of FIG.
  • FIG. 1 shows a flowchart of a method according to the invention according to the second embodiment. It serves to produce a structure having a first leg, a second leg and a third leg using a first group of braiding threads and a second group of braiding threads.
  • step S1_1 the third leg is braided with the first and second groups of braiding threads.
  • step S1_2 the braid threads of the second group are cut off from their respective bobbins. Then they are put into a storage state so that they can be reassigned later. Alternatively, the braiding threads can be removed together with their associated bobbins.
  • step S1_3 the braiding threads of the first group are cut off. Alternatively, the braiding threads of the first group can be removed together with their associated bobbins. In step S1_4, two pairs of braided threads are crossed over. This ensures that even in the trainee gusset sufficient coverage with braiding threads is guaranteed.
  • step S1_5 the braiding threads of the first group are knotted again on respective bobbins.
  • respective braiding threads are knotted on bobbins, which belong to respective bobbin groups, each bobbin group may consist of four bobbins and may be separated from the next bobbin groups by four bobbins each. This achieves a uniform half machine occupancy.
  • the braiding threads of the first group can be used together with their associated bobbins.
  • step S1_6 the first leg is then braided with the first group of braiding threads.
  • step S1_7 the braiding threads of the second group are knotted on respective bobbins, for which purpose the same bobbins are used as already in step S1_5.
  • step S1_8 the second leg is braided with the second group of braiding threads.
  • Fig. 2 shows a scheme for crossing braiding threads.
  • the respective clappers are arranged along a circle 10. which is subdivided into a first semicircle 12 and a second semicircle 14.
  • the first semicircle 12 and the second semicircle 14 adjoin one another at a first division point 16 and at a second division point 18 and together form the entire circle 10.
  • the first semicircle 12 and the second semicircle 14 are complementary to one another.
  • Adjacent to the respective dividing points 16, 18 are each schematically four bobbins each with associated braiding threads shown. In each case, the circle shown on the bobbin positions symbolizes the assignment of a weaving thread.
  • the bobbins shown are the clappers 20, 21, 22 and 23, which are arranged adjacent to the first division point 16, and the clappers 25, 26, 27, 28, which are arranged adjacent to the second division point 18.
  • those threads which after the step of braiding the third leg are associated with bobbins on the first semicircle 12 belong to the first group of braiding threads.
  • those braiding threads which after the step of braiding the third leg are associated with bobbins on the second semicircle 14 belong to the second group of braiding threads.
  • the bobbins 20 and 21 as well as the bobbins 27 and 28 are pairs of bobbins whose associated braiding threads are crossed over.
  • the crossover of the braiding threads, the respective distance to the nearest division point is reversed.
  • the braid thread which was associated with the clapper 22 before crossing over and thus had the smallest possible distance to the nearest divisional point 16 is assigned to the clapper 25 after crossing over and thus has the greatest possible distance from the nearest divisional point 18 with respect to the crossed braiding threads.
  • Fig. 3 shows in more detail crossed cross braiding threads on a gusset.
  • a braided structure 100 is shown, which was braided by means of the method according to the second embodiment.
  • the braided structure 100 has a first leg 110, a second leg 120 and a third leg 130. Between the first leg 1 10 and the second leg 120, a gusset 170 is formed, in which, as shown, several crossed braiding threads extend.
  • a core 180 can be seen on which the respective braiding threads have been braided.
  • the core 180 can largely dictate the shape of the braided structure 100.
  • Fig. 4 shows schematically the assignment of braid threads to respective bobbins prior to braiding the first leg or the second leg.
  • the clappers are, as already explained with reference to FIG. 2, arranged along a circle 10.
  • the bobbin positions are designated overall by reference numeral 30.
  • a first four-ply bobbin cluster 32 and a second four-ply beater group 34 are shown, to which braiding yarns are attached prior to braiding a respective leg, preferably by knotting.
  • braiding yarns are attached prior to braiding a respective leg, preferably by knotting.
  • four beaters are also arranged, which are referred to as another bobbin group 36. These define the distance between the first clapper group 32 and the second clumping group 34.
  • FIG. 5 shows the braided structure 100 already shown in FIG. 3 at an intermediate stage during the manufacturing process.
  • the third leg 130 and the first leg 1 10 were already braided.
  • a second leg is not yet formed.
  • the steps illustrated in FIG. 1 were carried out up to and including step S1_7.
  • two pairs of braids were crossed and the braids of the second group were knotted on respective bobbins according to the division shown in FIG.
  • one arm of the core 180 defines the second leg to be formed. For this, it passes through a ring 40 of the braiding machine, which leads braid threads 160 of the second group of braiding threads.
  • the second leg 120 By continuing the braiding process and slowly pulling out of the Kerns 180 from the ring 40, the second leg 120, which can be seen in Fig. 3, formed.
  • a braided structure is produced with a first leg, a second leg and a third leg using a first group, a second group and a third group of braiding threads.
  • the respective legs are to be formed radially symmetrical to each other and otherwise the same, in particular with the same diameter, be formed.
  • step S2_1 the third leg is braided with the first group of braiding threads and the second group of braiding threads.
  • the first leg is braided with the first group of braiding threads and the third group of braiding threads.
  • step S2_3 the second leg is braided with the second group of braiding threads and the third group of braiding threads.
  • the braiding of the respective legs takes place from the branch point, i. from the point at which the three legs adjoin one another.
  • the braiding of the first leg may also be from its endpoint, i. in the direction of the branching point.
  • FIG. 7 schematically shows such a braided structure 100.
  • the structure 100 has a first leg 110, a second leg 120 and a third leg 130. As shown, these are identical and have a radial symmetry relative to each other.
  • the first leg 1 10 is formed from a first group 51 of braiding threads and a third group 53 of braiding threads.
  • the second leg 120 is made up of a second group 52 of braiding threads and the third group 53 formed by braided threads.
  • the third leg 130 is formed of the first group 51 of braiding threads and the second group 52 of braiding threads.
  • the braiding angle is 30 °, as shown schematically in the first leg 1 10 on the basis of the angle ⁇ of one of the braiding threads to an axis parallel to the extension of the first leg 1 10.
  • FIG. 8 schematically shows an alternative braided structure 100 in a schematic representation, this braided structure 100 having a total of four legs, namely a first leg 110, a second leg 120, a third leg 130 and a fourth leg 140. These are identical and formed radially symmetrical to each other.
  • FIG. 8 shows, inter alia, the first group 51 of braiding threads and the second group 52 of braiding threads. It can be seen here that the third leg 130 is braided with the first group 51 of braiding threads and the second group 52 of braiding threads.
  • the first leg 110 is braided, inter alia, with the first group 51 of braiding threads.
  • the second leg 120 is braided inter alia with the second group 52 of braiding threads.
  • the fourth leg is braided with a third group 53 of braiding threads and a fourth group 54 of braiding threads.
  • the braiding angle is in all cases 45 °, which, as can easily be seen in FIG. 8, enables a uniform connection of the respective braiding threads entering and exiting the respective legs 1 10, 120, 130, 140.
  • FIG. 9 schematically shows another alternative braided structure 100 with a total of five legs, namely a first leg 110, a second leg 120, a third leg 130, a fourth leg 140 and a fifth leg 150.
  • the fourth leg 140 is between the first leg 1 10 and the third leg 130 is formed.
  • the fifth leg 150 is located between the second leg 120 and the third viewpoint. 130 formed.
  • the first leg 1 10 and the second leg 120 are formed adjacent to each other.
  • the fourth leg 140 is braided with a fourth group 54 of braiding threads and a fifth group 55 of braiding threads.
  • the fifth leg 150 is braided with a third group 53 of braiding threads and a fifth group 55 of braiding threads.
  • the braiding angle is in this case 18 °. This also ensures a respective connection of the entering or leaving braiding threads to the respective legs 1 10, 120, 130, 140, 150 in the same and therefore optimum manner. This facilitates the braiding of the five legs 1 10, 120, 130, 140, 150 in the same way, with the same extent and with the same number of braiding threads. It is common to all the braided structures shown that each leg is only braided once with optimum guidance of the threads with regard to the force flow. Compared with the methods according to the prior art, which require twice the braiding of at least one leg in such branched structures, a considerable weight and material saving is thus achieved. The method is therefore particularly advantageous for such structures.
  • FIGS. 10 to 13 show steps in a method for producing the structure of FIG. 7.
  • each group of braiding threads has 12 braiding threads each, so that each leg is braided from a total of 24 braiding threads.
  • Fig. 10 shows a state in which first the third leg 130 has been braided.
  • the first group 51 of braiding threads and the second group 52 of braiding threads were used.
  • braided with 24 braids and along the direction shown by the two arrows. This direction points to an area where late ter the branch point will be.
  • Each arrow represents the weaving direction of a group of braiding threads.
  • 1 1 shows a state in which, after the braiding of the third leg 130, the braiding threads of the two groups 51, 52 protrude separately from the third leg 130.
  • the total of 24 braiding threads were thus divided into two groups of 12 braiding threads each.
  • Fig. 12 shows a state which arises from the state shown in Fig. 1 1 by braiding of the first leg 1 10.
  • the third group 53 of braiding threads is additionally added, which also has 12 braiding threads.
  • the first leg 110 has been braided outwardly from the branching point, ie just the other way round, than the third leg 130. Meanwhile, the not yet braided sections of the braiding threads of the second group 52 of braiding threads and the third group 53 of braiding threads are standing by the braid from.
  • FIG. 13 shows a state that arises from the state shown in FIG. 12 by braiding the second leg 120.
  • the second group 52 of braiding threads and the third group 53 of braiding threads were used.
  • the second leg 120 was braided outwardly from the branching point.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)

Abstract

L'invention concerne un procédé permettant le tressage d'une structure, des fils de tressage utilisés pour cela étant répartis, après le tressage d'une branche, pour le tissage d'autres branches. Il n'est pas nécessaire d'avoir recours au double surtressage de branches. L'invention concerne en outre une structure tressée produite de manière correspondante.
PCT/EP2014/074419 2013-11-13 2014-11-12 Procédé de tressage et structure tressée Ceased WO2015071336A1 (fr)

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DE112014005186.1T DE112014005186A5 (de) 2013-11-13 2014-11-12 Verfahren zum Flechten und geflochtene Struktur

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DE102013223154.7 2013-11-13
DE102013223154.7A DE102013223154A1 (de) 2013-11-13 2013-11-13 Verfahren zum Flechten und geflochtene Struktur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018103613A1 (de) * 2018-02-19 2019-08-22 Freistaat Bayern vertreten durch Hochschule Hof, Institut für Materialwissenschaften Geflochtene Struktur, insbesondere Stent, und Verfahren zum Flechten einer geflochtenen Struktur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879687A (en) * 1954-06-09 1959-03-31 Leimbach Johann Braiding process and apparatus
DE4234979A1 (de) * 1991-10-18 1993-04-22 Murata Machinery Ltd Rohrfoermiges geflecht und vorrichtung zu dessen herstellung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK1148839T3 (da) * 1999-02-01 2008-12-15 Univ Texas Vævede togrenede og tregrenede stenter og fremgangsmåder til fremstilling heraf
US6622604B1 (en) * 2000-01-31 2003-09-23 Scimed Life Systems, Inc. Process for manufacturing a braided bifurcated stent

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879687A (en) * 1954-06-09 1959-03-31 Leimbach Johann Braiding process and apparatus
DE4234979A1 (de) * 1991-10-18 1993-04-22 Murata Machinery Ltd Rohrfoermiges geflecht und vorrichtung zu dessen herstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018103613A1 (de) * 2018-02-19 2019-08-22 Freistaat Bayern vertreten durch Hochschule Hof, Institut für Materialwissenschaften Geflochtene Struktur, insbesondere Stent, und Verfahren zum Flechten einer geflochtenen Struktur
WO2019158760A1 (fr) * 2018-02-19 2019-08-22 Freistaat Bayern vertreten durch Hochschule Hof, Institut für Materialwissenschaften Structure tressée, en particulier stent, et procédé de tressage d'une structure tressée

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DE112014005186A5 (de) 2016-07-28

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