DE102018101828A1 - METHOD FOR PRODUCING A SUPPORT RING - Google Patents

Abstract

The present disclosure is directed to a method (400) of making a plastic backing ring (200) comprising the following method steps; Providing (401) an annular injection molding tool (100), wherein the annular injection molding tool (100) has a tool wall (101) which delimits a tool cavity (103), wherein at least one inlet opening (105-1, 105-) is provided in the tool wall (101). 2, 105-3, 105-4) and at least one outlet opening (109-1, 109-2, 109-3, 109-4) are formed, wherein the inlet opening (105-1, 105-2, 105-3, 105-4) and the outlet opening (109-1, 109-2, 109-3, 109-4) are fluidly connected to the mold cavity (103), the inlet opening (105-1, 105-2, 105-3, 105-4) is spaced from the exit aperture (109-1, 109-2, 109-3, 109-4) by a first distance (119-1) along a first arc (117) of the annular die (100), and wherein the inlet opening (105-1, 105-2, 105-3, 105-4) from the outlet opening (109-1, 109-2, 109-3, 109-4) through a second distance (119-2) along a second circular arc (117) of the ringf The first arc (117-1) and the second arc (117-2) are different, and wherein the first distance (119-1) and the second distance (119-2) are different ; Introducing (403) a plastic melt (125) through the inlet opening (105-1, 105-2, 105-3, 105-4) in the mold cavity (103) until the plastic melt (125) through the outlet opening (109-1, 109-2, 109-3, 109-4) exits the tool cavity (103); and curing (405) the plastic melt (125) in the annular injection molding tool (100) to obtain the plastic support ring (200).

Description

The present invention relates to a method for producing a support ring, in particular a support ring made of plastic.

In compressed air applications in a conventional vehicle deformable corrugated hoses are often at least partially used, which can be advantageously installed in the space of the vehicle due to low bending radii. At high pressure, especially in a charge air hose, due to the deformable properties of the deformable corrugated hoses, damage to the corrugated hoses may occur under certain circumstances. For this reason, rigid metal support rings are often used in conventional corrugated tubes, which are mounted on the corrugated tube to counteract a radial deformation of the corrugated tube. The production of dimensionally stable metal support rings may be associated with a large manufacturing and assembly costs, and therefore lead to considerable costs.

It is the object underlying the invention to provide a support ring made of plastic, which has advantageous mechanical properties and is inexpensive to produce.

This object is achieved by the subject matter having the features of the independent claims. Advantageous embodiments of the invention are the subject of the figures, the description and the dependent claims.

According to a first aspect of the invention, the object is achieved by a method for producing a plastic support ring, comprising the following method steps; Providing an annular injection molding tool, wherein the annular injection molding tool has a tool wall defining a tool cavity, wherein in the mold wall at least one inlet opening and at least one outlet opening are formed, wherein the inlet opening and the outlet opening are fluidly connected to the mold cavity, wherein the inlet opening of the Outlet opening is spaced by a first distance along a first arc of the annular injection mold, and wherein the inlet opening is spaced from the outlet opening by a second distance along a second arc of the annular injection mold, wherein the first circular arc and the second circular arc are different, and wherein the first distance and the second distance are different; Introducing a plastic melt through the entrance opening into the tool cavity until the plastic melt exits the tool cavity through the exit opening; and curing the plastic melt in the annular injection mold to obtain the plastic support ring.

In a further subsequent to the curing of the plastic melt process step, the annular injection mold can be opened to remove the support ring made of plastic from the open annular injection mold.

By inserting the plastic melt in the mold cavity of the annular injection mold, the annular injection mold is completely filled with the plastic melt and the plastic melt is then cured. When the annular injection molding tool is subsequently opened, the solid plastic support ring can be removed from the annular injection molding tool.

In this case, the tool wall and / or the tool cavity bounded by the tool cavity cavity of the annular injection molding tool in particular also has an annular shape.

The annular injection molding tool has at least one outlet opening and at least one inlet opening. Thus, plastic melt flowing in through the inlet opening can flow through the tool cavity to the outlet opening and then exit from the tool cavity through the outlet opening. Here, in particular, the volume of the supplied plastic melt is greater than the volume of the mold cavity, so that the mold cavity is completely filled with plastic melt and e.g. no air bubbles remain inside the mold cavity.

In the annular injection molding tool according to the present disclosure, the first distance along the first arc between the inlet opening and the outlet opening is different from the second distance along the second circular arc between the inlet opening and the outlet opening. Thus, the outlet opening and the inlet opening are not arranged exactly symmetrical to each other in the annular injection mold.

If the annular injection molding unit has only a single inlet opening and a single outlet opening, this means that the outlet opening and the inlet opening are not exactly opposite each other, and consequently that the distances extending along different circular arcs of the annular injection molding tool between the outlet opening and the inlet opening are different.

It follows that at the same flow rate of the entering through the inlet plastic melt entering the first flowing clockwise through the annular injection mold plastic melt stream and the second counter-clockwise flowing through the annular injection mold plastic melt stream at the opposite point of the inlet concurrently. Since the first and second distances are different according to the present disclosure, that is, the outlet opening of the inlet opening is not exactly opposite, the two plastic melt streams do not meet directly at the outlet opening, but meet the two plastic melt streams in a region which is offset from the outlet opening. As a result, the plastic melt can not escape directly through the outlet opening after the meeting, but must first be distributed in the mold cavity before.

This first results in an advantageous mixing, in particular by a turbulence of the two plastic melt streams, before a common mixed plastic melt stream reaches the outlet opening and then exits through the outlet opening.

The annular injection molding tool may in particular have a multiplicity of, in particular two, three, four, five, six, seven, eight, nine or ten, inlet openings and / or outlet openings. Here, the number of inlet openings and the number of outlet openings are in particular the same, i. The annular injection molding tool has in particular two inlet openings and two outlet openings, has in particular three inlet openings and three outlet openings, has in particular four inlet openings and four outlet openings, in particular has five inlet openings and five outlet openings, in particular has six inlet openings and six outlet openings, in particular seven inlet openings and seven outlet openings, on, in particular eight inlet openings and eight outlet openings, in particular has nine inlet openings and nine outlet openings, and in particular has ten inlet openings and ten outlet openings.

The large number of inlet openings and / or outlet openings can ensure that the plastic melt can be distributed quickly within the mold cavity before the plastic melt cools significantly.

If the annular injection molding tool has more than one inlet opening or more than one outlet opening, then the respective outlet openings are arranged in each case between two inlet openings along the circumference of the annular injection mold, or the respective inlet openings are respectively arranged between two outlet openings. Thus, the plurality of inlet openings and the plurality of outlet openings along the circumference of the annular injection molding tool are arranged alternately.

Here, the first distance between an outlet opening and one of the two adjacent to the respective outlet opening inlet port is applied, and in this case the second distance between the outlet opening and the other of the two adjacent to the respective outlet opening inlet is applied. Due to the alternating arrangement of the inlet openings and the outlet opening, a particularly advantageous distribution of the plastic melt within the annular injection molding tool can be ensured.

Due to the advantageous mixing of the two plastic melt streams, the solid plastic of the support ring has a particularly homogeneous structure after the plastic melt has hardened, in particular in the vicinity of the outlet opening of the annular injection molding tool. The homogeneous structure of the support ring leads to particularly advantageous mechanical properties of the support ring, in particular to a high breaking strength of the support ring. In addition, a plastic existing support ring can be produced in the injection molding method according to the present disclosure with a low production cost and a low cost and easily mounted on a corrugated hose.

The annular injection molding tool and / or the support ring are in particular formed as a torus-shaped body. The plastic melt comprises in particular a thermoplastic, in particular polyamide, in particular polyamide 6.6. The plastic melt may in particular comprise glass fibers, wherein the proportion of glass fibers in the plastic melt is in particular between 0 wt .-% and 50 wt .-%, in particular between 20 wt .-% and 35 wt .-%.

The temperature of the plastic melt during insertion into the annular injection mold is in particular between 250 ° C and 350 ° C, in particular between 300 ° C and 320 ° C.

In an advantageous embodiment, the plastic melt introduced through the inlet opening mixes within the mold cavity, before the mixed plastic melt exits the mold cavity through the exit opening.

Thereby, for example, the technical advantage is achieved that a present in the mold cavity mixed plastic melt leads to a particularly homogeneous plastic material of the resulting support ring after curing.

In an advantageous embodiment, the mold cavity has at least one contact region in which plastic melt streams introduced through the inlet opening meet, wherein the contact region is arranged offset in relation to the outlet opening in the mold cavity.

As a result, the technical advantage is achieved, for example, that effective mixing of the plastic melt streams introduced through the introduction opening occurs in the contact region, as a result of which a homogeneous plastic material is obtained which, after curing, leads to a particularly stable resulting support ring. The plastic melt introduced through the inlet opening divides into two plastic melt streams after entering the mold cavity, one of the two plastic melt streams flowing through the tool cavity in a clockwise direction and the other of the two plastic melt streams flowing through the tool cavity counterclockwise. Thus, it comes in the contact area to a meeting of the two plastic melt streams.

Characterized in that the contact area offset from the outlet opening of the annular injection molding tool is arranged in the mold cavity, the plastic melt after the meeting can not escape directly through the outlet opening from the mold cavity, but must first change the flow path. As a result, in particular, swirling of the plastic melt within the mold cavity, whereby a particularly advantageous mixing of the plastic melt is achieved before the advantageously mixed plastic melt is then passed to the outlet opening and can escape.

In an advantageous embodiment, the annular injection molding tool has at least one receiving area with a receiving cavity, wherein the receiving area is fluidly connected through the outlet opening with the tool cavity, and wherein the receiving cavity is formed, emerging from the outlet opening plastic melt take.

As a result, the technical advantage is achieved, for example, that arranged in the at least one receiving area and fluidly connected to the mold cavity through the outlet opening receiving cavity ensures that exiting through the outlet opening plastic melt does not escape uncontrollably from the annular injection mold. After the plastic melt has hardened in the mold cavity, in the receiving region and in the fluidic connection between the receiving region and the mold cavity, a support ring is formed with at least one plastic projection, which can be subsequently removed from the support ring, e.g. by cutting off. The at least one receiving cavity of the receiving region may be arranged in particular radially outside or radially inwardly with respect to the annular mold cavity of the annular injection molding tool.

In an advantageous embodiment, the receiving region has a T-shape, wherein in particular the two tips of the T-shaped receiving region extend at least in sections in the direction of a circular arc of the annular injection molding tool.

As a result, the technical advantage is achieved, for example, that a T-shape of the receiving area ensures a spatially compact arrangement of the entire annular injection molding tool and also allows an effective absorption of the excess plastic melt. In this case, the T-shaped receiving region in particular has two tips, wherein in particular a linear connection region to the annular tool wall extends from the middle between the two tips. In this case, the linear connection region of the T-shaped receiving region is in particular shorter than the two tips of the T-shaped receiving region, and / or the volume of the receiving cavity in the linear connection region is less than the volume of the receiving cavity in the two tips. As a result, it can be ensured that the majority of the plastic melt emerging from the outlet opening can be received in the receiving cavity of the two tips of the T-shaped receiving area and does not remain in the receiving cavity of the linear connecting area.

The two tips of the T-shaped receiving region extend in particular at least in sections in the direction of a circular arc of the annular injection molding tool. This indicates the two tips of the T-shaped Receiving portion to an extension direction, which corresponds to the extension direction of the annular tool wall, so that a particularly compact shape of the annular injection molding tool is ensured.

In an advantageous embodiment, the annular injection molding tool has at least one inlet cap with an inlet cavity, wherein the inlet cavity is fluidly connected through the inlet opening with the mold cavity, and wherein the inlet cavity is adapted to supply plastic melt discharged from an inlet nozzle of a supply tool to the mold cavity through the inlet opening.

Thereby, for example, the technical advantage is achieved that the inlet nozzle of the feed tool can be particularly advantageously attached to the inlet cap to allow an effective insertion of the plastic melt from the inlet nozzle of the feed tool through the inlet cavity of the inlet cap and through the inlet opening in the mold cavity. After curing of the plastic melt, the resulting support ring in the region of the inlet cavity of the annular injection mold has a plastic overhang which can be removed, e.g. by cutting off.

In an advantageous embodiment, the annular injection molding tool has a first half-shell and a second half-shell, which form the tool wall of the annular injection-molding tool and delimit the mold cavity.

Thereby, for example, the technical advantage is achieved that the two half-shells of the annular injection mold effectively form the mold cavity, in which the plastic melt is added during insertion into the mold cavity. After curing of the plastic melt, the two half-shells can be effectively separated from each other to open the annular injection mold and remove the resulting support ring from the annular injection mold.

In an advantageous embodiment, a first inlet opening, a second inlet opening, a first outlet opening, and a second outlet opening are formed in the tool wall, which are fluidly connected to the mold cavity, wherein the first outlet opening is formed between the first and second inlet openings in the mold wall, wherein the second exit opening is formed between the second and first entry openings opposite the first exit opening in the tool wall, the first entry opening being spaced from the first exit opening and the second entry opening being spaced from the second exit opening by a first distance along a first arc of the annular die is, and wherein the second inlet opening of the first outlet opening and wherein the first inlet opening of the second outlet opening in each case by a second distance ent long spaced a second arc of the annular injection molding tool.

As a result, for example, the technical advantage is achieved that the use of two inlet openings and two outlet openings ensures a particularly effective mixing of the plastic melt in the annular injection mold, whereby a particularly homogeneous plastic mixture is obtained in the mold cavity before curing.

The annular injection molding tool has a first and second inlet opening, and a first and second outlet opening, which are arranged side by side in particular along the circumference of the annularly extending mold wall of the annular injection molding tool. On the one side of the annular injection molding tool, the first outlet opening is arranged between the first and second inlet opening and on the opposite side of the annular injection molding tool, the second outlet opening is arranged between the second and first inlet opening. Considered along the circumference of the annular injection molding tool, the first outlet opening follows the first inlet opening, follows the second inlet opening on the first outlet opening, follows the second inlet opening on the second inlet opening, and follows the second inlet opening again the first inlet opening.

In this case, the angle between the respective inlet opening and the corresponding adjacent outlet opening, which angle is limited by the corresponding circular arc, is in particular approximately 90 °.

In an advantageous embodiment, a first, second and third inlet opening, and a first, second and third outlet opening are formed in the mold wall, which are fluidly connected to the mold cavity, wherein the first outlet opening is formed between the first and second inlet opening in the mold wall, wherein the second exit opening is formed between the second and third entry openings in the tool wall, and wherein the third exit opening is formed between the third and first entry openings in the tool wall, the first entry opening being from the first exit opening, the second entry opening being from the second exit opening and wherein the third entrance opening of the third exit opening being spaced apart by a first distance along the first arc of the annular die, the second entry opening being from the first exit opening, the third entry opening from the second exit opening, and the first entry opening from the third exit opening, each through a second distance is spaced along the second arc of the annular injection mold.

As a result, for example, the technical advantage is achieved that the use of three inlet openings and three outlet openings ensures a particularly effective mixing of the plastic melt in the annular injection mold, whereby a particularly homogeneous plastic mixture is obtained in the mold cavity before curing. By increasing the number of inlet and outlet openings, an effective mixing of the plastic melt can be ensured before there is a significant cooling of the plastic melt.

The annular injection molding tool has a first, second and third inlet opening, as well as a first, second and third outlet opening, which are arranged side by side in particular along the circumference of the annularly extending mold wall of the annular injection molding tool. The first outlet opening is arranged between the first and second inlet openings, the second outlet opening is arranged between the second and third inlet openings, and the third outlet opening is arranged between the third and first inlet openings. Considered along the circumference of the annular injection mold, the first inlet opening follows the first inlet opening, follows the second inlet opening on the first outlet opening, follows the second inlet opening on the second outlet opening, follows the third outlet opening on the second outlet opening, follows the third inlet opening the third outlet opening and follows on the third outlet opening again the first inlet opening.

In this case, the angle between the respective inlet opening and the corresponding adjacent outlet opening, which is limited by the corresponding circular arc, is in particular approximately 60 °.

In an advantageous embodiment, a first, second, third and fourth inlet opening, and a first, second, third and fourth outlet opening are formed in the mold wall, which are fluidly connected to the mold cavity, wherein the first outlet opening between the first and second inlet opening in the Tool wall is formed, wherein the second outlet opening between the second and third inlet opening in the mold wall is formed, and wherein the third outlet opening between the third and fourth inlet opening in the mold wall is formed, wherein the fourth outlet opening between the fourth and first inlet opening in the mold wall is formed, wherein the first inlet opening of the first outlet opening, wherein the second inlet opening of the second outlet opening, wherein the third inlet opening of the third outlet opening, and wherein the fourth inlet opening of d the fourth outlet opening is spaced apart in each case by a first distance along the first arc of the annular injection mold, wherein the second inlet opening of the first outlet opening, wherein the third inlet opening of the second outlet opening, the fourth inlet opening of the third outlet opening and wherein the first inlet opening of the fourth outlet opening is spaced apart in each case by a second distance along the second circular arc of the annular injection molding tool.

As a result, for example, the technical advantage is achieved that the use of four inlet openings and four outlet openings ensures a particularly effective mixing of the plastic melt in the annular injection mold, whereby a particularly homogeneous plastic mixture is obtained in the mold cavity before curing. By increasing the number of inlet and outlet openings, an effective mixing of the plastic melt can be ensured before there is a significant cooling of the plastic melt.

The annular injection molding tool has a first, second, third and fourth inlet opening, and a first, second, third and fourth outlet opening, which are arranged side by side in particular along the circumference of the annularly extending mold wall of the annular injection molding tool. The first outlet opening is arranged between the first and second inlet openings, the second outlet opening is arranged between the second and third inlet openings, the third outlet opening is between the third and fourth inlet openings, and the fourth outlet opening is arranged between the fourth and first inlet openings. Considered along the circumference of the annular injection mold, the first inlet opening follows the first inlet opening, follows the second inlet opening on the first outlet opening, follows the second inlet opening on the second outlet opening, follows the third outlet opening on the second outlet opening, follows the third inlet opening the third outlet opening follows the fourth inlet opening on the third outlet opening, follows the fourth outlet opening on the fourth inlet opening and follows the fourth outlet opening again the first inlet opening.

Here, the limited by the corresponding arc angle between the respective inlet opening and the corresponding adjacent outlet opening in particular about 45 °.

In particular, the annular injection molding tool beyond the four inlet openings and the four outlet openings may have any number of further inlet openings and / or further outlet openings, wherein an alternating arrangement between the respective inlet openings and outlet openings along the circumference of the annular injection mold is maintained.

In an advantageous embodiment, the method comprises the further method step, removal of at least one plastic supernatant on the hardened support ring.

As a result, the technical advantage is achieved, for example, that the removal of the plastic supernatant on the cured support ring, a support ring is obtained, which has an effectively flat surface, and thereby particularly advantageous for stabilizing a corrugated hose can be used.

According to a second aspect of the invention, the object is achieved by an annular injection molding tool for producing a plastic support ring, with a tool wall defining a mold cavity for receiving a plastic melt, at least one inlet opening for introducing the plastic melt into the mold cavity, wherein the inlet opening in the Mold wall formed and fluidly connected to the mold cavity, and at least one outlet opening for carrying the plastic melt from the mold cavity, wherein the outlet opening formed in the mold wall and fluidly connected to the mold cavity, wherein the inlet opening from the outlet opening by a first distance along a first Circular arc of the annular injection molding tool is spaced, wherein the inlet opening from the outlet opening by a second distance along a second arc of the ringförmi Injection molding tool spaced apart, wherein the first arc and the second arc are different, and wherein the first distance and the second distance are different.

As a result, the technical advantage is achieved, for example, that a support ring made of plastic can be produced by the annular injection molding tool particularly advantageous.

According to a third aspect of the invention, the object is achieved by a support ring made of plastic producible by a method according to the first aspect.

As a result, for example, the technical advantage is achieved that a particularly dimensionally stable support ring is obtained.

According to a fourth aspect of the invention, the object is achieved by a hose assembly having a corrugated hose, wherein the corrugated hose has a tubular portion in which at least one wave crest is formed, wherein a circumferential wave trough is formed laterally of the corrugation, at least one support ring according to the third Aspect, wherein the at least one support ring is arranged in a corrugation of the corrugated hose and adapted to support the corrugated hose.

As a result, for example, the technical advantage is achieved that the support ring ensures effective radial support of the radially deformable corrugated hose, especially at high pressure loads the corrugated hose. The corrugated hose is in particular at least partially formed from an elastomer.

The advantageous embodiments cited for the method for producing the support ring according to the first aspect apply analogously to an advantageous embodiment for an annular injection molding tool for producing a support ring according to the second aspect, for a support ring according to the third aspect, and for a hose assembly according to the fourth aspect.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

• 1 eine perspektivische Ansicht eines ringförmigen Spritzgusswerkzeuges gemäß der vorliegenden Offenbarung;
• 2A eine seitliche Schnittansicht eines herkömmlichen ringförmigen Spritzgusswerkzeuges mit einströmender Kunststoffschmelze;
• 2B eine seitliche Schnittansicht eines ringförmigen Spritzgusswerkzeuges gemäß der vorliegenden Offenbarung mit einströmender Kunststoffschmelze;
• 3 eine perspektivische Ansicht eines Stützrings gemäß der vorliegenden Offenbarung;
• 4 eine perspektivische Ansicht einer Schlauchanordnung umfassend einen Wellschlauch und einen Stützring gemäß der vorliegenden Offenbarung; und
• 5 eine schematische Darstellung eines Verfahrens zum Herstellen eines Stützrings gemäß der vorliegenden Offenbarung.

Show it:

• 1 a perspective view of an annular injection molding tool according to the present disclosure;
• 2A a side sectional view of a conventional annular injection mold with inflowing plastic melt;
• 2 B a side sectional view of an annular injection molding tool according to the present disclosure with inflowing plastic melt;
• 3 a perspective view of a support ring according to the present disclosure;
• 4 a perspective view of a hose assembly comprising a Corrugated tube and a support ring according to the present disclosure; and
• 5 a schematic representation of a method for producing a support ring according to the present disclosure.

1 FIG. 12 is a perspective view of an annular injection molding tool according to the present disclosure. FIG. During an injection molding process, a plastic melt is poured into the annular injection mold 100 introduced. After the annular injection mold 100 was completely filled with the plastic melt, the plastic melt is then inside the annular injection mold 100 hardened, so that the plastic merges into a solid state of aggregation and forms a solid support ring. Subsequently, the annular injection mold 100 open, leaving an in 1 Not shown support ring made of solid and particularly dimensionally stable plastic from the annular injection molding tool 100 can be removed, wherein the outer surface of the support ring in particular the inner surface of the annular injection molding tool 100 maps.

The annular injection mold 100 has a tool wall 101 on which one in 1 only schematically illustrated tool cavity 103 limited. As well as the annular injection mold 100 also have the tool wall 101 and the mold cavity 103 an annular shape.

In the tool wall 101 is a first entrance opening 105-1 , a second entrance opening 105-2 , a third entrance opening 105-3 and a fourth entrance opening 105-4 educated. The entrance openings 105-1 . 105-2 . 105-3 . 105-4 are with the tool cavity 103 fluidly connected. At the first, second, third and fourth inlet openings 105-1 . 105-2 . 105-3 . 105-4 is in each case a first, second, third and fourth entrance tower 107-1 . 107-2 . 107-3 . 107-4 arranged. To the entrance essays 107-1 . 107-2 . 107-3 . 107-4 can each have a in 1 Not shown inlet nozzle of a feed tool are arranged to melt plastic through 1 not shown entrance cavities of the respective entrance tower 107-1 . 107-2 . 107-3 . 107-4 and through the respective inlet opening 105-1 . 105-2 . 105-3 . 105-4 the mold cavity 103 supply.

For an effective shaping of the means of the annular injection molding tool 100 The tool cavity must ensure 103 completely filled with plastic melt. For this reason, the volume of the supplied plastic melt is greater than the volume of the mold cavity 103 , The excess volume of the plastic melt is removed from the mold cavity 103 in each case by a first, second, third and fourth outlet opening 109-1 . 109-2 . 109-3 . 109-4 in the tool wall 101 executed.

So that the liquid plastic melt is not uncontrolled through the respective outlet opening 109-1 . 109-2 . 109-3 . 109-4 exit, are the first, second, third and fourth exit opening 109-1 . 109-2 . 109-3 . 109-4 each with a first, second, third and fourth receiving cavity 113-1 . 113-2 . 113-3 . 113-4 a respective first, second, third and fourth receiving area 111-1 . 111-2 . 111-3 . 111-4 the annular injection molding tool 100 fluidly connected. Thus, through the outlet openings 109-1 . 109-2 . 109-3 . 109-4 exiting plastic melt effectively in the respective receiving cavity 113-1 . 113-2 . 113-3 . 113-4 be recorded.

So that the annular injection mold 100 can be effectively used to make a support ring is the annular injection mold 100 in particular formed as a torus-shaped body, of which the entrance essays 107-1 . 107-2 . 107-3 . 107-4 and the reception areas 111-1 . 111-2 . 111-3 . 111-4 in relation to a circle center 115 the annular injection mold 100 extend radially outward.

The reception areas 111-1 . 111-2 . 111-3 . 111-4 in particular each have a T-shape. In particular, the two peaks extend 114 the respective T-shaped receiving areas 111-1 . 111-2 . 111-3 . 111-4 at least in sections in the direction of a circular arc 117-1 . 117-2 the annular injection mold 100 ,

The annular injection mold 100 has in particular a first half-shell and a second half-shell, which are joined together to form the in 1 illustrated tool wall 101 which in turn forms the mold cavity 103 limited to accommodate the plastic melt. After curing of the plastic melt, the first half-shell can be removed from the second half-shell, so that through the tool wall 101 limited tool cavity 103 is exposed and the cured support ring from the annular injection mold 100 can be removed.

The tool wall 101 the annular injection mold 100 extends along the in 1 schematically illustrated first and second circular arc 117 - 1 . 117 -2 of the annular injection molding tool 100 , Even if, for illustrative technical reasons, no further circular arcs in the 1 are shown, the Sum of all circular arcs the entire circumference of the annular injection mold 100 ,

Here is the respective outlet opening 109-1 . 109-2 . 109-3 . 109-4 each between two inlet openings 105-1 . 105-2 . 105-3 . 105-4 arranged in the tool wall 101. Thus, each one of the inlet openings 105-1 . 105-2 . 105-3 . 105-4 between two adjacent outlet openings 109-1 . 109-2 . 109-3 . 109-4 arranged, or is in each case one of the outlet openings 109-1 . 109-2 . 109-3 . 109-4 between two adjacent inlet openings 105-1 . 105-2 . 105-3 . 105-4 arranged.

The first entrance opening 105-1 is from the first outlet 109-1 through a first distance 119-1 along the first arc 117-1 the annular injection mold 100 spaced. The second entrance opening 105-2 is from the first outlet 109-1 through a second distance 119-2 along the second arc 117-2 the annular injection mold 100 spaced. In the injection mold 100 According to the present disclosure, the first distance 119-1 and the second distance 119-2 differently. In particular, the second distance 119-2 less than the first distance 119-1 ,

For better clarity are in 1 only the distances 119-1 . 119-2 between the first exit opening 109-1 and the adjacent first entrance opening 105-1 , or the adjacent second inlet opening 105-2 shown.

In the annular injection molding tool 100 However, in accordance with the present disclosure, the in 1 not shown first distance 119-1 between the second outlet opening 109-2 and the second inlet opening 105-2 different in addition 1 not shown second distance 119-2 between the second outlet opening 109-2 and the third entrance opening 105-3 ,

In the annular injection molding tool 100 However, in accordance with the present disclosure, the in 1 not shown first distance 119-1 between the third exit opening 109-3 and the third entrance opening 105-3 different in addition 1 not shown second distance 119-2 between the third exit opening 109-3 and the fourth entrance opening 105-4 ,

In the annular injection molding tool 100 However, in accordance with the present disclosure, the in 1 not shown first distance 119-1 between the fourth exit opening 109-4 and the fourth entrance opening 105-4 different in addition 1 not shown second distance 119-2 between the fourth exit opening 109-4 and the first entrance opening 105-1 ,

The function of different distances 119-1 . 119-2 between the respective outlet opening 109-1 . 109-2 . 109-3 . 109-4 and the corresponding inlet openings 105 -1, 105-2 . 105-3 . 105-4 is explained below.

As in 1 is shown only schematically, plastic melt passes through the respective inlet openings 105-1 . 105-2 . 105-3 . 105-4 in the mold cavity 103 the annular injection mold 100 on. The plastic melt flows along a first inlet flow direction 121-1 clockwise inside the mold cavity 103 the annular injection mold 100 and flows along a second inlet flow direction 121-2 counterclockwise within the mold cavity 103 the annular injection mold 100 , This will make the tool cavity 103 the annular injection mold 100 completely filled with liquid plastic melt.

At the respective outlet openings 109-1 . 109-2 . 109-3 . 109-4 enters the respective in the second inlet flow direction 121-2 counterclockwise flowing plastic melt and the respective in the first inlet flow direction 121-1 Clockwise flowing plastic melt on each other, mix and become along the outlet flow direction 123 the plastic melt through the respective outlet openings 109-1 . 109-2 . 109-3 . 109-4 discharged together.

For reasons of clarity is in the 1 only through the second and third inlet 105-2 . 105-3 entering plastic melt and through the second outlet opening 109-2 emerging plastic melt shown. Through the first and fourth inlet 105-1 and 105-4 However, the plastic melt occurs analogously along the first and second inlet flow direction 121-1 . 121-2 on. Through the first, third and fourth outlet 109-1 . 109-3 . 109-4 However, the plastic melt occurs analogously along the outlet flow direction 123 out.

When the plastic melts at the same flow rate through the respective inlet openings 105-1 . 105-2 . 105-3 . 105-4 in the mold cavity 103 enter, lead the different distances 119-1 . 119-2 between the respective outlet openings 109-1 . 109-2 . 109-3 . 109-4 and the respective adjacent inlet openings 105-1 . 105-2 . 105-3 . 105-4 to that in the first inlet flow direction 121-1 inflowing plastic melt and in the second inlet flow direction 121-2 inflowing plastic melt the respective between the adjacent inlet openings 105-1 . 105-2 . 105-3 . 105-4 lying outlet opening 109-1 . 109-2 . 109-3 . 109-4 reach at different times.

Thereby, the contact area between the first inlet flow direction 121-1 flowing plastic melt and in the second inlet flow direction 121-2 flowing plastic melt relative to the respective outlet opening 109-1 . 109-2 . 109-3 . 109-4 added.

For illustrative reasons, the contact area in the 1 not shown, so for a more detailed presentation on the 2 B is referenced.

Characterized in that in different inlet flow directions 121-1 . 121-2 flowing plastic melts the respective outlet opening 109-1 . 109-2 . 109-3 . 109-4 Achieve at different times, an effective mixing of the two plastic melts is ensured before the mixed plastic melt then through the respective outlet opening 109-1 . 109-2 . 109-3 . 109-4 exits the mold cavity 103.

The plastic melt comprises in particular a thermoplastic, in particular polyamide, in particular polyamide 6.6. The plastic melt comprises in particular glass fibers, in particular between 0 wt .-% and 50 wt .-%, in particular between 20 wt .-% and 35 wt .-%.

The plastic melt is in particular at a temperature between 250 ° C and 350 ° C, in particular between 300 ° C and 320 ° C in the annular injection mold 100 introduced.

That by the different distances 119-1 . 119-2 conditional effective mixing of the plastic melt streams comprises a multiple mixing of the components of the plastic melts, whereby an isotropic structure is achieved and after curing of the homogeneous plastic melt of the resulting support ring has particularly advantageous dimensionally stable properties, such as a higher breaking strength. Due to the advantageous dimensionally stable properties of the support ring, the support ring can be made only effective in an injection molding process. This results in a weight reduction of the support ring, as well as a cost reduction in the production.

Through the respective receiving cavities 113-1 . 113-2 . 113-3 . 113-4 the annular injection mold 100 , as well as the openings in the area of the inlet openings 105-1 . 105-2 . 105-3 . 105-4 the annular injection mold 100 the support ring after curing at the corresponding areas on plastic projections. The plastic projections can be removed, for example by breaking off or cutting off, so that an effectively rounded support ring can be obtained.

In particular, the number of inlet openings 105-1 . 105-2 . 105-3 . 105-4 and the outlet openings 109-1 . 109-2 . 109-3 . 109-4 not limited to four. In particular, the tool wall 101 the annular injection mold 100 a single entrance opening 105-1 and a single outlet 109-1 respectively. In particular, the tool wall 101 the annular injection mold 100 two inlet openings 105-1 . 105-2 and two outlet openings 109-1 . 109-2 respectively. In particular, the tool wall 101 the annular injection mold 100 three inlets 105 to 1 . 105-2 . 105-3 and three outlet openings 109-1 . 109-2 . 109-3 respectively. In particular, the tool wall 101 the annular injection mold 100 a plurality of, in particular five, six, seven, eight, nine or ten, inlet openings 105-1 . 105-2 . 105-3 . 105-4 and outlet openings 109-1 . 109 - 2 . 109-3 . 109-4 respectively.

2A shows a side sectional view of a conventional annular injection mold with inflowing plastic melt.

In the 2A is a section of a conventional annular injection molding tool 100 with a tool wall 101 shown, which has a tool interior 103 limited. In the 2A is only the second outlet 109-2 shown, which with a second receiving cavity 113-2 of the second recording area 111-2 the conventional annular injection molding tool 100 fluidly connected.

In the in 2A shown view are the first, second, third and fourth inlet opening 105-1 . 105-2 . 105-3 . 105-4 , as well as first, third and fourth outlet opening 109-1 . 109-3 . 109-4 Not shown.

It is emphasized that in a conventional annular injection mold 100 according to the 2A the distances between the adjacent inlet openings 105-1 . 105-2 . 105-3 . 105-4 and outlet openings 109-1 . 109-2 . 109-3 . 109-4 are the same. For illustrative reasons, the corresponding constant distances in the 2A Not shown.

The through the mold cavity 103 flowing plastic melt 125 is due to a multitude of individual plastic particles 127 shown. The through the in 2A not shown second inlet opening 105-2 along the first inflow 121-1 Clockwise flowing plastic melt 125 meets in a contact area 129 on by the in 2A not shown third inlet opening 105-3 along the second inflow direction 121-2 counter-clockwise flowing plastic melt 125 ,

Due to the identical distances 119-1 . 119-2 between the second outlet opening 109-2 and the adjacent inlet openings 105-2 . 105-3 the two plastic melt streams reach the contact area 129 simultaneously. This is the contact area 129 opposite the second outlet opening 109-2 not offset and the two plastic melt streams do not mix sufficiently effectively before the plastic melt 125 through the second exit opening 109-2 from the mold cavity 103 exit. The insufficient mixture of the plastic melt 125 in the contact area 129 can result in the cured support ring, for example, to a reduced breaking strength.

2 B FIG. 10 is a side sectional view of an annular injection molding tool according to the present disclosure with inflowing plastic melt. FIG.

In the 2 B is the second outlet 109-2 in the tool wall 101 an annular injection molding tool 100 according to the present disclosure, wherein the second outlet opening 109-2 with a second receiving cavity 113-2 a second recording area 111-2 the annular injection mold 100 fluidly connected.

In the in 2 B shown view are the first, second, third and fourth inlet opening 105-1 . 105-2 . 105-3 . 105-4 , as well as first, third and fourth outlet opening 109-1 . 109-3 . 109-4 Not shown.

It is emphasized that in the annular injection mold 100 according to the present disclosure according to 2 B the distances 119-1 . 119-2 between the adjacent inlet openings 105-1 . 105-2 . 105-3 . 105-4 and outlet openings 109-1 . 109-2 . 109-3 . 109-4 are different. For illustrative reasons, the corresponding different distances 119-1 . 119-2 in the 2 B Not shown.

The through the in 2 B not shown second inlet opening 105-2 along the first inflow direction 121-1 Clockwise flowing plastic melt 125 meets in a contact area 129 on by the in 2 B not shown third inlet opening 105-3 along the second inflow direction 121-2 counter-clockwise flowing plastic melt 125 ,

In the annular injection mold 100 According to the present disclosure, the first distance is 119-1 between the in 2 B not shown second inlet opening 105-2 and the second exit port 109-2 and is the second distance 119-2 between the in 2 B not shown third inlet opening 105-3 and the second exit port 109-2 differently. The second distance 119-2 is in particular less than the first distance 119-1 ,

At the same flow rate of the two plastic melts 125 aptly the two plastic melts in a contact area 129 on each other, which is in relation to the circumference of the mold cavity 103 at the midpoint between the second inlet opening 105-2 and the third entrance opening 105-3 located. Due to the different distances 119-1 . 119-2 there is the second outlet opening 109-2 but not at the corresponding center.

Thus, the second outlet opening 109-2 opposite the contact area 129 between the along the first inflow direction 121-1 Clockwise flowing plastic melt 125 and along the second inflow direction 121-2 counter-clockwise flowing plastic melt 125 added.

This causes the plastic melt 125 after the meeting, not directly through the second outlet 109-2 can escape, but first the flow direction of the plastic melt 125 must change before an exit is possible. By changing the flow direction, there is an effective mixing of the plastic melt 125 before the mixed plastic melt 125 through the second exit opening 109-2 can escape. By the offset of the contact area 129 opposite the second outlet opening 109-2 There is a particularly effective mixing of the two plastic melt streams, in particular to an effective turbulence of the two plastic melt streams, whereby an effective mixing and thus an isotropic distribution of the plastic molecules in the plastic melt 125 is ensured.

This has the after curing of the plastic melt 125 obtained support ring particularly advantageous mechanical properties.

3 shows a perspective view of a support ring according to the present disclosure. The support ring 200 is through one in the 1 and 2 B illustrated annular injection molding tool 100 manufactured. With regard to the injection molding process and the plastic materials used will refer to the comments on the 1 and 2 B directed.

Through the receiving cavities 113-1 . 113-2 . 113-3 . 113-4 and the inlet openings 105-1 . 105-2 . 105-3 . 105-4 the annular injection mold 100 has the support ring 200 Plastic supernatants 201 on. The plastic overhangs 201 However, they can be removed to provide an effective dimensionally stable support ring 200 to obtain.

4 shows a perspective view of a hose assembly comprising a corrugated hose and a support ring according to the present disclosure. The hose arrangement 300 includes a corrugated hose 301 , The corrugated tube 301 consists of a tubular section 303 in which a multitude of circulating wave crests 305 is shaped. Between the wave mountains 305 is each a trough 307 shaped, which is the tubular section 303 circulates.

The corrugated tube 301 consists of an elastic material, in particular an elastomer, and thus shows sufficiently flexible properties. Through the wave mountain 305 can be a length and motion compensation of the corrugated hose 301 ensuring the flexible properties of the corrugated hose 301 during operation, eg in a motor vehicle.

Too large a radial deformation of the corrugated hose 301 Counteract is at least a support ring 200 on the corrugated hose 301 deferred, wherein the at least one support ring 200 in a trough 307 of the corrugated tube 301 arranged. Due to the dimensionally stable properties of the support ring 200 becomes the corrugated tube 301 , eg in high pressure applications, stabilized.

The tubular section 101 of the corrugated tube 301 may comprise a plastic sheath, in particular a silicone rubber sheath and is in particular formed from a plastic-containing material. This will be a cost-effective corrugated hose 301 provided with advantageous properties.

5 shows a schematic representation of a method for producing a support ring according to the present disclosure.

The procedure 400 for producing a support ring 200 made of plastic comprises providing as the first method step 401 an annular injection molding tool 100 , For details of the annular injection molding tool 100 will refer to the comments on the 1 and 2 B directed. The procedure 400 comprises insertion as a second method step 403 a plastic melt 125 in the annular injection mold 100 ,

The procedure 400 includes curing as a third process step 405 the plastic melt 125 in the annular injection mold 100 to a support ring 200 Made of plastic.

The procedure 400 includes as an optional fourth subsequent to the curing of the plastic melt process step opening 407 the annular injection mold 100 to the support ring 200 made of plastic from the open annular injection mold 100 refer to.

All features explained and shown in connection with individual embodiments of the invention may be provided in different combinations in the article according to the invention, in order to simultaneously realize their advantageous effects.

The scope of the present invention is given by the claims and is not limited by the features illustrated in the specification or shown in the figures.

LIST OF REFERENCE NUMBERS

100

Annular injection mold

101

mold wall

103

mold cavity

105-1

First entrance

105-2

Second entrance

105-3

Third entrance opening

105-4

Fourth inlet

107-1

First entrance tower

107-2

Second entrance tower

107-3

Third entry essay

107-4

Fourth entrance tower

109-1

First outlet

109-2

Second exit opening

109-3

Third exit opening

109-4

Fourth outlet

111-1

First recording area

111-2

Second recording area

111-3

Third recording area

111-4

Fourth recording area

113-1

First intake cavity

113-2

Second intake cavity

113-3

Third intake cavity

113-4

Fourth receiving cavity

114

Top of a T-shaped reception area

115

Circle center of the annular injection molding tool

117-1

First circular arc of the annular injection molding tool

117-2

Second arc of the annular injection mold

119-1

First distance

119-2

Second distance

121-1

First inlet flow direction

121-2

Second inlet flow direction

123

Outlet flow direction

125

Plastic melt

127

Plastic particles

129

contact area

200

support ring

201

Plastic supernatant

300

hose assembly

301

corrugated hose

303

Tubular section of the corrugated hose

305

Wellenberg

307

trough

400

Method for producing a support ring

401

First process step: Provision of an annular injection molding tool

403

Second process step: introducing a plastic melt into the annular injection molding tool

405

Third process step: curing of the plastic melt

407

Fourth method step: opening the annular injection molding tool

Claims (10)

Method (400) for producing a plastic support ring (200), comprising the following method steps: Providing (401) an annular injection molding tool (100), the annular injection molding tool (100) having a tool wall (101) defining a tool cavity (103), wherein in the tool wall (101) at least one inlet opening (105-1, 105-2, 105-3, 105-4) and at least one outlet opening (109-1, 109-2, 109-3, 109-4) are formed wherein the inlet opening (105-1, 105-2, 105-3, 105-4) and the outlet opening (109-1, 109-2, 109-3, 109-4) are fluidly connected to the mold cavity (103) . wherein the inlet opening (105-1, 105-2, 105-3, 105-4) from the outlet opening (109-1, 109-2, 109-3, 109-4) by a first distance (119-1) along a first circular arc (117-1) of the annular injection molding tool (100) is spaced, and wherein the inlet opening (105-1, 105-2, 105-3, 105-4) from the outlet opening (109-1, 109-2, 109-3, 109-4) through a second distance (119-2) along a second circular arc (117-2) of the annular injection molding tool (100) is spaced, wherein the first arc (117-1) and the second arc (117-2) are different and wherein the first distance (119-1) and the second distance (119-2) are different; Introducing (403) a plastic melt (125) through the inlet opening (105-1, 105-2, 105-3, 105-4) in the mold cavity (103) until the plastic melt (125) through the outlet opening (109-1, 109-2, 109-3, 109-4) exits the tool cavity (103); and Curing (405) the plastic melt (125) in the annular injection molding tool (100) to obtain the plastic support ring (200). Method (400) after Claim 1 , wherein the plastic melt (125) introduced through the inlet opening (105-1, 105-2, 105-3, 105-4) mixes within the mold cavity (103) before the mixed plastic melt (125) passes through the outlet opening (109). 1, 109-2, 109-3, 109-4) exits the tool cavity (103). Method (400) after Claim 1 or 2 wherein the mold cavity (103) has at least one contact region (129) in which plastic melt streams introduced through the inlet opening (105-1, 105-2, 105-3, 105-4) meet, the contact region (129) facing the outlet opening (109-1, 109-2, 109-3, 109-4) offset in the tool cavity (103) is arranged. Method (400) according to one of the preceding claims, wherein the annular injection molding tool (100) has at least one receiving area (111-1, 111-2, 111-3, 111-4) with a receiving cavity (113-1, 113-2, 113 -3, 113-4), wherein the receiving area (111-1, 111-2, 111-3, 111-4) is connected to the tool wall (101), wherein the receiving cavity (113-1, 113-2, 113-3, 113-4) through the exit opening (109-1, 109-2, 109- 3, 109-4) is fluidly connected to the tooling cavity (103), and wherein the receiving cavity (113-1, 113-2, 113-3, 113-4) is formed from the outlet opening (109-1, 109-4). 2, 109-3, 109-4) to receive exiting plastic melt (125). Method (400) Claim 4 wherein the receiving area (111-1, 111-2, 111-3, 111-4) has a T-shape, and in particular the two tips (114) of the T-shaped receiving area (111-1, 111-2 , 111-3, 111-4) extend at least in sections in the direction of a circular arc (117-1, 117-2) of the annular injection molding tool (100). The method (400) according to any one of the preceding claims, wherein the annular injection molding tool (100) has at least one entry cap (107-1, 107-2, 107-3, 107-4) with an entrance cavity (103), the entrance cavity (103 ) is fluidly connected to the tool cavity (103) through the inlet opening (105-1, 105-2, 105-3, 105-4), and wherein the inlet cavity (103) is formed to dispense plastic melt (125) discharged from an inlet nozzle of a feed tool ) through the inlet opening (105-1, 105-2, 105-3, 105-4) to the tool cavity (103). Method (400) according to one of the preceding claims, wherein in the tool wall (101) a first, second, third and fourth inlet opening (105-1, 105-2, 105-3, 105-4), and a first, second, third and fourth outlet opening (109-1, 109 -2, 109-3, 109-4) which are fluidly connected to the mold cavity (103), wherein the first outlet opening (109-1) is formed between the first and second inlet openings (105-1, 105-2) in the tool wall (101), wherein the second outlet opening (109-2) is formed between the second and third inlet openings (105 -2, 105-3) is formed in the tool wall (101), and wherein the third outlet opening (109-3) is formed between the third and fourth inlet openings (105-3, 105-4) in the tool wall (101), and wherein the fourth outlet opening (109-4) is formed between the fourth and first inlet openings (105-4, 105-1) in the tool wall (101), the first entry port (105-1) being from the first exit port (109-1), the second entry port (105-2) being from the second exit port (109-2), the third entry port (105-3) being from the third port Outlet opening (109-3), wherein the fourth inlet opening (105-4) from the fourth outlet opening (109-4) in each case by a first distance (119-1) along the first circular arc (117-1) of the annular injection molding tool (100). is spaced, the second entry port (105-2) being from the first exit port (109-1), the third entry port (105-3) being from the second exit port (109-2), the fourth port (105-4) being from the third port Outlet opening (109-3) and wherein the first inlet opening (105-1) from the fourth outlet opening (109-4) in each case by a second distance (119-2) along the second circular arc (117-2) of the annular injection molding tool (100) is spaced. An annular injection molding tool (100) for producing a plastic support ring (200), comprising: a tool wall (101) delimiting a tool cavity (103) for receiving a plastic melt (125), at least one inlet opening (105-1, 105-2, 105-3, 105-4) for introducing the plastic melt (125) into the mold cavity (103), the inlet opening (105-1, 105-2, 105-3, 105-4) is formed in the tool wall (101) and fluidly connected to the tool cavity (103); and at least one exit opening (109-1, 109-2, 109-3, 109-4) for discharging the plastic melt (125) from the tool cavity (103), the exit opening (109-1, 109-2, 109-3, 109-4) is formed in the tool wall (101) and fluidly connected to the tool cavity (103); wherein the inlet opening (105-1, 105-2, 105-3, 105-4) from the outlet opening (109-1, 109-2, 109-3, 109-4) by a first distance (119-1) along a first arc (117-1) of the annular injection molding tool (100) is spaced, wherein the inlet opening (105-1, 105-2, 105-3, 105-4) from the outlet opening (109-1, 109-2, 109 -3, 109-4) is spaced by a second distance (119-2) along a second circular arc (117-2) of the annular injection molding tool (100), the first circular arc (117-1) and the second circular arc (117- 2) are different, and wherein the first distance (119-1) and the second distance (119-2) are different. Support ring (200) made of plastic produced by a method (400) according to one of the preceding Claims 1 to 7 , A hose assembly (300), comprising: a corrugated hose (301), the corrugated hose (301) having a tubular portion (303) in which at least one corrugation peak (305) is formed, with a circumferential corrugation (307) at the side of the corrugation peak (305) ) is formed, at least one support ring (200) according to the Claim 9 wherein the at least one support ring (200) is disposed in a trough (307) of the corrugated hose (301) and is configured to support the corrugated hose (301).

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