CN106247041B

CN106247041B - Joint with fastening element and method for producing a sealing connection

Info

Publication number: CN106247041B
Application number: CN201610403087.6A
Authority: CN
Inventors: 安德列亚斯·米勒; 贝恩德·弗兰克; 约尔格·罗森塔尔; 克里斯蒂安·里舍恩; 安东·哈特曼; 袁雪峰; 胡国栋; 胡大军
Original assignee: Viega Technology GmbH and Co KG
Current assignee: Weijia Technology GmbH & Co Kg
Priority date: 2015-06-11
Filing date: 2016-06-08
Publication date: 2021-11-26
Anticipated expiration: 2036-06-08
Also published as: DE102015109268A1; CN106247041A

Abstract

A joint for producing a sealed connection to a workpiece, in particular to a pipe, has at least one pressure region (6), in which at least one sealing element (10) and at least one fastening element (12) are arranged, the fastening element (12) having at least one cutting element (14) made of a hard material, in particular a metal. The aim of specifying a joint for producing a sealed connection to a workpiece, by which the structure and use of the joint are further simplified and at the same time the connection to be produced is improved, is achieved in that the fastening part (12) has at least one retaining part (16) which consists at least partially of plastic and in that the retaining part (16) retains at least one cutting part (14). A method for producing a sealed connection between a joint and a workpiece, in particular a pipe, is also disclosed, at least one sealing element and at least one fastening element being arranged in the contact region of the joint. Also relates to a sealed connection between the joint (2) and the workpiece (4).

Description

Joint with fastening element and method for producing a sealing connection

Technical Field

The invention relates to a joint for producing a sealed connection to a workpiece, in particular to a pipe, having at least one pressing region, wherein at least one sealing element and at least one fastening element are arranged in the pressing region, wherein the fastening element has at least one cutting element made of a hard material, in particular a metal. The invention also relates to a method for producing a sealed connection between a joint and a workpiece, in particular a pipe, wherein at least one sealing element and at least one fastening element are arranged in a pressing region of the joint. Furthermore, the invention relates to a sealed connection between a joint and a workpiece.

Background

In the prior art, joints of the type mentioned at the outset are also used for producing sealed connections in the pipeline technology and in steel structures, in particular for conducting liquids or gases in pipelines and their connections. In this case, the joint is pressed against the workpiece, for example a pipe or a fitting, and a sealed, permanent connection is thereby obtained. Furthermore, the connection cannot be disassembled, i.e. separated again without destroying the workpiece or the joint.

A typical fitting has at least one sealing member and one securing member. The seal of the connection to be produced is produced by a sealing element, which is made of an elastic material, for example, and which is arranged at the location of the seal on the joint and the workpiece. The fastening element serves for the mechanical fastening of the connection and does not allow an accidental release of the connection. The fastening element is usually made of a hard, non-elastic material and has a force fit or form fit with the workpiece, in particular by being pressed or cut into the workpiece. This design of the joint is also particularly suitable for large pipe diameters.

EP0922896a1 and DE10207201a1 disclose couplings with a cutting element and a sealing element, which are arranged in particular in two different sections on the inner circumferential surface of the coupling.

Further described in EP1593899a1 and WO2010/089188a1 are joints in which a cutting member and a sealing member are arranged together in a pressing section. The cutting member and the sealing member are here separated by a separating ring located in the middle.

EP1593898a1 further discloses a sealing element for a joint made of an elastic material, wherein a cutting element is mounted in the sealing element.

Disclosure of Invention

The object of the invention is to provide a joint and a method for producing a sealed connection to a workpiece. The joint and the method further simplify the construction and use of the joint and at the same time improve the connection to be produced. A sealed connection between a joint according to the invention and a workpiece is also described.

The above-mentioned object is achieved according to a first teaching with respect to a joint in that the securing element has at least one retaining element which is at least partially composed of plastic and which retains at least one cutting element.

By providing the fastening element with at least one cutting element made of a hard material, in particular metal, and at least one holding element at least partially made of plastic, the at least one cutting element can be provided as required for the pressing. The at least one cutting element or the plurality of cutting elements is/are held by the holding element, whereby the cutting element can be arranged freely in the pressing region of the joint without the cutting element having to be shaped in such a way that it rests in a defined position independently of one another. Thereby, the fixing part of the joint has a greater degree of freedom in design and flexibility in use than conventional joints.

The holding part is at least partially made of plastic. By using plastic as at least part of the fastening part, the production costs are reduced compared to fastening parts which are composed entirely of hard material, in particular entirely of metal, since the material expenditure is low. This makes it possible to use individual, small and simple-structured cutting elements made of a hard material, in particular metal, which are distributed, for example, along the circumference of the circular cross section of the fastening element. The at least one cutting member is then held, in particular by an annular holding member. In contrast to fastening elements which are composed entirely of hard material, in particular entirely of metal, the plastic of the retaining element is easier to form and to machine, which in turn leads to a reduction in the production costs of the joint. The holding part is preferably composed entirely of plastic.

In addition, the design possibilities of the fastening element are improved. The plastic used for the holding part is preferably a hard plastic which deforms only insignificantly under the contact pressure generated during the contact pressure. The holding element can be designed such that the transfer of the contact pressure to the at least one cutting element is promoted and accelerated by the holding element. The contact pressure acting via the at least one cutting element can thereby be increased or set in a targeted manner, which results in a better pressing of the at least one cutting element into the material of the workpiece to be pressed and thus contributes to an overall improvement of the pressing effect.

The holding part can thus hold the at least one cutting element in a favorable position during the pressing process and promote the pressing in or the cutting-in of the at least one cutting element.

In one embodiment of the joint, the holding part and the at least one cutting part are connected to one another. The connection of the holding part and the cutting part simplifies the handling and production of the joint, since fewer parts have to be taken into account. Furthermore, the connection of the holding part and the cutting part serves in an advantageous manner to support the cutting process of the cutting part through the holding part, in particular when such a connection has no gaps. The connection between the holding part and the at least one cutting part can be made by means of force fit, form fit and/or material fit.

For example, the holding part is shaped in the form of a ring and the at least one cutting part is connected to the holding part along the circumference in a force-fitting manner. The cutting member can thereby be designed particularly simply, for example from a bent sheet metal. Such a cutting member may be shaped like a clip or a U and extend in the radial direction or in the axial direction of the annular holding member.

For example, the annular holding part can have at least one recess along the circumference, in which recess at least one cutting part is arranged. Thereby, an improved force fit between the parts can be produced and an annular fixing member having substantially the same shape of the outer and inner peripheral surfaces can be obtained. Furthermore, the recess can have a contour by means of which a form fit with the cutting element is produced.

The holding part and the cutting part can likewise be connected by material fit, for example by gluing or welding. The at least one cutting element can be connected to the holding element in a material-fit manner by injection molding or extrusion of the plastic of the holding element.

In particular, the fastening element is formed in one piece and has a force fit, a form fit or a material fit between the at least one cutting element and the holding element. Thus, the number of parts of the joint is further reduced and thus manufacturing and handling is simplified.

In a further embodiment of the joint, the fastening element directly contacts the sealing element. Direct contact between the sealing part and the cutting part can be problematic because the sealing part can be mechanically damaged during the compression process and the connection may even become unsealed. A separating ring, in particular consisting of plastic, often has to be provided between the sealing part and the cutting part.

By having a fixing member of the holding member, the spacer ring may not be used. In particular, the sealing element directly contacts the holding element, wherein the at least one cutting element is held in a spaced-apart manner relative to the sealing element. The retaining member can thus simultaneously fulfil the function of a spacer ring. The section of the holding part which is in direct contact with the sealing ring is preferably composed of plastic. Thus, damage to the sealing part can be prevented in a simple manner during the pressing by the fixing part.

In a further embodiment of the joint, however, at least one of the cutting elements has an annular element which is in direct contact with the sealing element. The contact between the sealing member and the annular section of the at least one cutting member may improve the tightness of the connection to be made.

In a further embodiment of the joint, at least one additional separating element is provided, which is arranged between the sealing element and the fastening element. The separating ring can in particular protect the sealing component from damage during the pressing process and further facilitate the sealing.

In a further embodiment of the joint, the fastening element is shaped like a ring and has a plurality of cutting elements which are arranged distributed along the circumference of the fastening element. As already explained, the material expenditure can be reduced by the holding part and at the same time the pressing effect can be improved. A tubular workpiece can be surrounded along the circumference by an annular fastening element. In this case, a plurality of cutting elements arranged distributed along the circumference can be used for a secure mechanical fastening of the connection.

In particular, the cutting members are distributed along the circumference at equal intervals. The cutting members may further be arranged in a symmetrical, e.g. mirror-symmetrical distribution.

Furthermore, at least one annular cutting element can be provided, wherein the cutting element has a single, circumferentially distributed cutting edge. The respective holding part can complement the annular cutting part in such a way that at least one section of the outer circumferential surface of the fixing part is substantially cylindrical in a side view.

In a further embodiment of the joint, the holding part is composed at least partially of polybutylene terephthalate (PBT), Polyoxymethylene (POM), Polyamide (PA), polyethylene terephthalate (PET) or polysulfone. Thermoplastics having good strength properties and high temperature resistance in both reinforced and unreinforced embodiments may generally be used. These plastics are advantageous in manufacture and processing. While the material is sufficiently hard so as not to significantly deform under the compaction conditions.

The holding element can also transfer the pressing force, in particular by means of a harder material. In a further embodiment of the joint, the holding element is provided for this purpose in such a way that during the pressing of the joint, a pressing force acting on the pressing section is transferred to the at least one cutting element. In particular, the pressing force applied to the joint is first applied to the holding part. The at least one cutting element is held by the holding element in such a way that at least a part of the contact pressure is transferred to the at least one cutting element, which in turn is pressed at least into the material of the workpiece. The design of the holding element can be used to specifically influence the pressing effect by means of the flux of the force lines of the pressing force transmitted from the connection via the holding element to the at least one cutting element.

In particular, force steering can also be carried out on the holding part. In order to press the at least one cutting element partially into the workpiece in the axial direction, the pressing force acting radially on the joint can be converted at least partially into a force acting axially on the at least one cutting element, for example.

In a further embodiment of the joint, a contact region for contacting the workpiece is provided. The connection can be further stabilized by using contact regions which are preferably not pressed or are only partially pressed. In particular the contact area, is able to hold the workpiece before pressing.

In a tubular workpiece, the inner diameter of the contact region corresponds to the outer diameter of the workpiece or the outer diameter of the contact region corresponds to the inner diameter of the workpiece.

Furthermore, the pressing region has at least one stop on the side remote from the contact region. Such a stop can serve in particular to define the pressing region and to hold the sealing element and optionally the fixing element in place before pressing. The ends of the tabs may be crimped, for example, to provide a stop. The crimping can be carried out along the entire circumference or in sections.

The stopper may also be constituted by a holding member. The manufacture of the joint can thereby be simplified. For example, the crimping of the ends of the tabs may be eliminated.

The above-mentioned object is achieved according to a further teaching in respect of a method for producing a sealed connection between a fitting and a workpiece, in particular a pipe, wherein the fastening element has at least one cutting element made of a hard material, in particular a metal, and at least one holding element, which is at least partially made of plastic, and wherein the at least one cutting element is held by the holding element, wherein the workpiece is connected to the fitting, wherein the fitting is pressed at least in a pressing region, wherein the sealing element between the fitting and the workpiece is pressed and wherein the at least one cutting element is pressed into the material of the workpiece.

The joint is in particular formed as previously described. As already mentioned, the at least one cutting element or the plurality of cutting elements can be positioned and arranged in the joint precisely as required by the pressing by means of the holding element. Thus, the fixing part of the joint has a greater degree of freedom in design and flexibility in use than conventional joints.

The plastic used for the holding part is preferably a hard plastic which deforms only insignificantly under the pressing force generated during the pressing process. The holding element can thus be designed such that the transfer of the pressing force to the at least one cutting element is promoted and facilitated by the holding element. The contact pressure acting via the at least one cutting element can thereby be increased or adjusted, which results in a better pressing or cutting of the at least one cutting element into the material of the workpiece to be pressed and thus in an improved pressing effect.

In one embodiment of the method, at least one cutting element is additionally pressed into the material of the joint. This results in a better fixation of the connection, since the at least one cutting element connects the workpiece and the joint on both sides in a form-fitting manner.

It is contemplated that some of the cutting elements cut into the workpiece and others cut into the joint. An improved connection is also produced because the individual cutting members are relatively held by the holding member.

In a further embodiment of the method, the contact pressure acting on the joint during the contact pressure is transferred via the holding element to the at least one cutting element. In particular, the pressing force exerted on the joint acts first on the holding part. The cutting element is held by the holding element in such a way that at least a part of the contact pressure is transferred to the cutting element, which in turn can cut the cutting element at least into the material of the workpiece.

In particular, force steering can also be carried out on the holding part. In order to press or cut the at least one cutting element partially into the workpiece in the axial direction, the pressing force, which acts radially on the joint, for example, can be converted at least partially into a force which acts axially on the at least one cutting element.

In a further embodiment of the method, a force fit and/or a form fit is produced between the holding part and the workpiece. The holding element can be pressed by the pressing of the joint against the workpiece and the connection can be further strengthened by means of a force fit. A positive fit between the holding part and the workpiece can likewise be considered, for example by means of a profile on the holding part and the workpiece.

The above object is solved according to a further teaching with respect to a sealing connection between a joint and a workpiece, in particular a pipe, wherein the sealing connection is produced in particular by the method set forth above, with the joint described above, wherein the sealing element is located in a sealing position between the joint and the workpiece and wherein the at least one cutting element is pressed into the material of the workpiece. In one embodiment of the sealing connection, at least one cutting element is additionally pressed into the material of the joint.

Drawings

In addition, reference is made to the above-described embodiments relating to the joint for further embodiments and advantages of the method or the sealing connection. The invention is explained in detail below with the aid of the figures. Shown in the drawings are:

figure 1a shows a first embodiment of a joint with a pipe in a cross-sectional view in an uncompressed state,

figure 1b shows in cross-section a first embodiment of a joint with a pipe in a compressed state,

figure 2 shows an embodiment of the holding part in a perspective view,

fig. 3a, b, c show an embodiment of the cutting member,

fig. 4a, b show an embodiment of the fixing element in a perspective view,

fig. 5a, b show a further embodiment of a cutting member in a perspective view,

figure 6a shows an embodiment of the fixing element with the cutting element of figure 5b in a perspective view,

figure 6b shows a second embodiment of the fitting with the fixing element and the pipe in figure 6a,

figure 7a shows a third embodiment of the joint with pipe in cross-section,

figure 7b shows the fixing element of figure 7a in a perspective view,

figure 8a shows a fourth embodiment of the joint with pipe in cross-section,

figure 8b shows the fixing element of figure 8a in a perspective view,

fig. 9a, b show a further embodiment of the cutting member in a perspective view,

figure 10 shows a further embodiment of the fixing element in a perspective view,

figure 11 shows a further embodiment of the fixing element in a perspective view,

FIG. 12 shows another embodiment of the fixing member in a perspective view, and

fig. 13a, b show an embodiment with a joint and a system of a pressing tool.

Detailed Description

Fig. 1a shows a first exemplary embodiment of a joint 2 with a pipe 4 as a workpiece in a non-compressed state in a sectional view. The joint 2 is tubular and has a compression region 6 and a contact region 8. The contact area 8 has an inner diameter approximately equal to the outer diameter of the pipe 4, so that the pipe 4 can be held in the contact area 8 by the device.

A sealing element 10 and a fastening element 12 are arranged in the pressure region 6 of the joint 2. The fixing part 12 has a metallic cutting part 14 which is held by a holding part 16 made of plastic.

The fitting 2 and the pipe 4 can now be pressed by means of a pressing tool not shown in fig. 1. An embodiment of a suitable pressing tool will be described in connection with fig. 13a, b. In particular, the pressing region 6 is subjected to a radially inwardly acting pressing force on the outer circumferential surface and is deformed. Thereby, the pressing force acts on the sealing member 10 and the fixing member 12.

Fig. 1b shows a first exemplary embodiment of a joint 2 with a pipe 4 in a compressed state in a sectional view. The sealing element 10, which is composed of an elastic material and has the shape of an O-ring, for example, is deformed in such a way that it is in a sealing position with respect to the pressure region 6 and the pipe 4. By means of the sealing member 10 the connection produced is sealed against liquids and/or gases which can be conducted through the pipe 4. The mechanical fixing and in particular the non-releasable connection is produced by the fixing element 12. The cutting member 14 is held by a holding member 16. During the pressing, a pressing force is thus exerted on the cutting member 14, so that the cutting member cuts into the material of the pipe 4. Thereby mechanically securing the connection.

Fig. 2 shows an embodiment of the holding part 16 in a perspective view. The holding part 16 is designed in the form of a ring and has

openings

18, 20 along the circumference. The

openings

18, 20 facilitate the deformation of the holding part 16 along the circumference, as a result of which the pressing force can also be transferred in the circumferential direction to the cutting part held by the holding part 16. Furthermore, the

openings

18, 20 can serve as an indicator of complete compression, for which, for example, the

openings

18, 20 can be seen from the outside. The width of the

openings

18, 20 allows an inference to be made about the circumference of the holding part 16 and thus to conclude full compression. The holding part 16 is preferably made at least in part of a hard material that is not deformable by the pressing force, for example polybutylene terephthalate (PBT), Polyoxymethylene (POM), Polyamide (PA), polyethylene terephthalate (PET) or polysulfone.

For the cutting element not shown in fig. 2, a recess 22 is provided, which in particular achieves a form fit with the cutting element. A corresponding embodiment of the cutting member is shown in fig. 3a, b, c. Fig. 3a, b show a cutting element 12 which is designed in the form of a clip and can be produced, for example, in the simplest manner from a sheet metal. Here, the cutting edge 26 is provided close to the clip-shaped base 24, which can be connected to the holding member. The cutting edge 26 can be arranged on one or both sides on the base body 24. If the cutting edges 26 are provided on both sides, the cutting member 14 may cut into the material of the joint in addition to the material of the workpiece. Fig. 3c shows another embodiment of the cutting member 14, which has cutting edges 26 on both sides.

Fig. 4a, b show an embodiment of the fixing element 12 in a perspective view, which is a combination of the holding element 16 in fig. 2 and the cutting element in fig. 3b, c. The cutting members 14 are inserted into the recesses 22 (see fig. 2) of the holding member 16, the cutting members being distributed along the circumference of the holding member 16.

Fig. 4a shows a fastening element 12 with a cutting element 14 according to the embodiment of fig. 3 b. The cutting member 14 can be clamped onto the holding member 16 and thus form a force-fit and/or form-fit with the holding member 16. A material-fit connection, for example an adhesive connection, can also be provided.

Fig. 4b shows a further fixing element 12 with a cutting element 14 according to the embodiment of fig. 3 c. The holding member 16 is only partially shown in fig. 4b in order to clarify the structure of the cutting member 14. The cutting member 14 is connected to the holding member 16 in a material-locking manner, for example by an adhesive connection or by injection molding or extrusion of the plastic of the holding member 16 onto the cutting member 14.

The cutting elements 14 can in particular be arranged at the same distance and distributed mirror-symmetrically along the circumference of the holding element 16.

By using a single, smaller cutting element 14 made of metal in conjunction with a holding element 16 made of plastic, the material expenditure for producing the joint is reduced. At the same time, the pressing effect can be improved by the design of the fastening element 12.

Fig. 5a, b show further, alternative embodiments of the cutting element 14 in perspective view. Here, an annular component 28 is provided, which consists of metal. The cutting member 14 also has cutting sections 30 which are connected to the annular member 28 and have cutting edges 26. The annular part 28 and the cutting section 30 are preferably formed in one piece.

In fig. 5a, the cutting edge 26 is formed on both sides, i.e. the cutting member 14 can be used both for pressing into the material of the workpiece and the material of the joint. Fig. 5b shows a cutting element 14 with a cutting edge 26 arranged on one side, which can be pressed into a workpiece.

Fig. 6a shows an embodiment of the fixing element 12 with the embodiment of the cutting element 14 in fig. 5b in a perspective view. The cutting member 14 may be connected to and retained thereby by the retaining member 16. The holding part 16 has a recess 22 here in order to accommodate the cutting section 30 of the cutting part 14.

Fig. 6b shows a second embodiment of a fitting 2 with the fixing part 12 of fig. 6a and a pipe 6, which can be connected to the fitting 2. The joint 2 also has a sealing element 10, which can be arranged together with a fastening element 12 in the pressure section 6 of the joint 2. The sealing element 10 can be in direct contact with the fastening element 12, in particular with the annular element 28 of the cutting element 14. It is possible to eliminate the need for a separating ring between the sealing member 10 and the cutting member 14.

Fig. 7a shows a third embodiment of a fitting 2 with a pipe 4 in a sectional view. The cutting member 14 is formed here as a clamp made of a sharp-edged sheet metal, which is clamped to an annular holding member 16. The cutting part 14 has a burr, which is determined by its production, which serves as a cutting edge 26 and can be bent outward in the radial direction, as shown in fig. 7a in particular. The cutting member 14 is directed in its preferred direction in the axial direction of the holding member 16.

Furthermore, the holding part 16 is shaped as a stop and surrounds the pressing region 6 at the end remote from the contact region 8. The retaining member 16 thus retains both the cutting member 14 and the sealing member 10 in their position in the joint 2. Optionally, a spacer ring 32 is provided between the stationary part 12 and the sealing part 10, which spacer ring protects the seal 10 against mechanical damage during the compression process.

Fig. 7b shows the fixing part 12 of fig. 7a in a perspective view. The clip-shaped cutting element 14 comprises a sharp-edged sheet metal which is clamped in the axial direction around an annular retaining element 16. The cutting members 14 may be arranged to be distributed at the same pitch along the circumference of the holding member 16. Fig. 7a, b show an embodiment of the joint 2 which is particularly low-cost in manufacture.

Fig. 8a shows a fourth embodiment of the joint 2 with the pipe 6 in a sectional view. The cutting element 14 is here arranged in the radial direction of the holding element 12. If the joint in the pressing section 6 is pressed radially inwards, this presses the cutting element 14 held by the retaining ring 16 into the material of the pipe 4.

Fig. 8b shows the fixing part 12 of fig. 8a in a perspective view. The cut portions 14 may be arranged to be distributed at the same interval along the circumference of the holding member 16. For producing the fastening element 12, the cutting element 14 can be radially extruded into the material of the holding element 16 or injection-molded or extruded. By the cutting element 14 having a larger radial extent than the radial wall thickness of the holding element 16, the securing element 12 can be used for compression in the joint 2.

Fig. 9a, b show in perspective views embodiments of the cutting element 14, which can likewise be used, for example, in the embodiments of the joint 2 or of the fastening element 12 in fig. 8a, b. The cutting elements 14 can be arranged on the annular holding element 16 in the radial direction or in the axial direction.

Fig. 9a shows a clip-shaped cutting element 14 here in the form of a U. This U-shape can be pressed into the material of the pipe 4. Such a cutting element 14 can be produced, for example, in a simple manner by stamping from a sheet metal and subsequent bending.

Fig. 9b likewise shows a clip-shaped cutting member 14 in the form of a U. A profile 34 (profiling) is additionally provided on the cutting element 14, which enables an improved connection to the holding element 16. Furthermore, the profile 34 can be designed such that it is pressed into the material of the pressing section 6 during the pressing in the joint 2. The respective cutting element 14 can likewise be produced by stamping and subsequent bending from a sheet metal.

Fig. 10 shows a further exemplary embodiment of a fastening element 12 in a perspective view. Here, the U-shaped cutting members 14 are distributed along the circumference of the holding member 16 according to the embodiment in fig. 9 a. The cutting member 14 is here arranged in its preferred direction in the axial direction of the fixing member. Thus, a particularly inexpensive fixing member 12 can be obtained.

Fig. 11 shows a further exemplary embodiment of a fastening element 12 in a perspective view, which likewise has a U-shaped cutting element 14. The cutting member 14 is designed similarly to the embodiment in fig. 9b and additionally has a profile 34 which can be pressed into the material of the workpiece and optionally into the material of the joint.

Fig. 12 shows a further embodiment of the fixing element 12 in a perspective view. Here, the cutting element 14 is alternatively shaped as a hat profile. In particular, the contact surface between the cutting element 14 and the holding element 16 can thereby be increased and a better holding of the cutting element 14 is achieved. The material of the holding part 16 may in particular pass through the cutting part 14. For example, the cutting member has an opening through which the material of the holding member 16 passes.

Fig. 13a shows a system with an embodiment of the joint 2 and a pressing tool 36. The pressing tool 36 is suitable here for deforming the pressing region 6 of the joint 2 and for producing a sealed connection of the joint 2 to the workpiece.

The pressing tool 36 is formed as a pressing ring. The pressing ring 36 has two

pressing tool halves

38a,38b which are mounted opposite one another in such a way that they can be rotated by means of a connecting element 40, for example a hinge or a joint. The tool halves 38a,38b have protruding

sections

42a,42b for an extruder (not shown). The receiving region 42 formed between the

press tool halves

38a,38b can be reduced by applying a force to the protruding

sections

42a,42 b.

The connector 2, which is arranged in the receiving region 42 as shown in fig. 13a, can thus be pressed radially inward by exerting a force on the protruding

sections

42a,42 b.

For clarity, fig. 13b shows a perspective view of the system of fig. 13a with an embodiment of the fitting 2 and a pressing tool 36.

For clarity, the joint 2 is shown without the fixing part 12 in fig. 13a, b. However, any of the embodiments of the fixing member 12 described above may be used by the system consisting of the fitting 2 and the pressing tool 36.

Claims

1. A joint for making a sealed connection to a workpiece, said joint

-having at least one pressing area (6),

-wherein at least one sealing part (10) and at least one fixing part (12) are provided in the compression region (6),

-wherein the fixing part (12) has at least one cutting part (14) made of metal, and

-wherein the sealing part (10) consists of a material which is softer than the material of which the workpiece is formed,

it is characterized in that the preparation method is characterized in that,

-the fixing part (12) has at least one retaining part (16) consisting of plastic,

-the holding part (16) holds at least one cutting part (14),

-the holding part (16) and at least one of the cutting parts (14) are connected to each other by means of a force fit, a form fit and/or a material fit,

-the fixation part (12) is in direct contact with the sealing part (10),

-the fixing part (12) is shaped as a ring and has a plurality of cutting parts (14) arranged distributed along the circumference of the fixing part (12), and

-the cutting member (14) has a cutting edge (26) arranged spaced apart from the sealing member (10).

2. A joint according to claim 1, wherein the workpiece is a pipe (4).

3. The joint according to claim 1, wherein the retaining member (16) is at least partially composed of polybutylene terephthalate (PBT), polyoxymethylene resin (POM), Polyamide (PA), polyethylene terephthalate (PET) or polysulfone.

4. A joint according to claim 1 or 2, wherein the holding part (16) is arranged to transfer a pressing force acting on the pressing area (6) to at least one of the cutting parts (14) during pressing of the joint.

5. The fitting according to claim 1,

-providing a contact area (8) for contact with a workpiece and

-the pressing area (6) has at least one stop on the side remote from the contact area (8).

6. Joint according to claim 5, characterized in that said stop is formed by a retaining member (16).

7. A method for producing a sealed connection between a joint and a workpiece,

wherein at least one sealing part and at least one fixing part are provided in the compression region of the joint,

-wherein the fixing part has at least one cutting part made of metal and at least one holding part consisting of plastic,

-wherein at least one of the cutting members is held by the holding member,

-wherein the holding part and at least one of the cutting parts are interconnected by means of a force fit, a form fit and/or a material fit, -wherein the securing part is in direct contact with the sealing part,

the fixing part is shaped as a ring and has a plurality of cutting parts arranged distributed along the circumference of the fixing part,

-wherein the sealing member consists of a material softer than the material forming the workpiece, and

-wherein the cutting member has a cutting edge arranged spaced apart from the sealing member,

-wherein a workpiece is joined to the joint,

-wherein the joint is compressed at least on the compression zone

-wherein the sealing member between the joint and the workpiece is compressed and

-wherein at least one of the cutting members is pressed into the material of the workpiece.

8. The method of claim 7, wherein the workpiece is a pipe.

9. Method according to claim 7, characterized in that at least one of the cutting members is additionally pressed into the material of the joint as well.

10. Method according to claim 7 or 8, characterized in that the pressing force acting on the joint is transferred to at least one of the cutting elements during pressing via the holding element.

11. Method according to claim 7, characterized in that a force-fit and/or form-fit is produced between the holding part and the workpiece.

12. A sealed connection between a joint and a workpiece, wherein the sealed connection is manufactured by a method according to any one of claims 7-11,

having a joint (2) according to any one of claims 1 to 6,

wherein the sealing element (10) is located in a sealing position between the joint (2) and the workpiece (4) and

wherein at least one cutting element (14) is pressed into the material of the workpiece (4).

13. The sealed connection of claim 12, wherein the workpiece is a pipe.

14. Sealing connection according to claim 12, characterized in that at least one of the cutting members (14) is additionally pressed into the material of the joint (2).