EP2602062B1 - Compression tool and attachment for a compression tool - Google Patents

Abstract

The pressing tool (2) has rotating elements (4), which are linked at rotational axis (6). The internal contours of headers (10) facing each other form retaining area (12). The internal contours have a sliding surface inclined towards the retaining area axis. Independent claims are included for the following: (1) a support with two headers; and (2) a method for detachable connection of work-pieces.

Description

The invention relates to a pressing tool for non-releasably connecting workpieces by converting a radially inwardly directed movement at least partially in a pressing force extending in the axial direction for generating a relative movement between two workpieces to be pressed, with two each having a pressing jaw pivoting elements and at least one axis of rotation on wherein the pivoting elements are articulated, wherein the inner contours of the opposed pressing jaws form a receiving area with a receiving area axis and wherein the inner contours each have two inclined against the receiving area axis, facing surfaces which are formed as a cone segment. The invention furthermore relates, according to the one conductive part of claim 2, to an attachment for a pressing tool with two pressing jaws, wherein each pressing jaw has an inner contour and wherein the opposing inner contours of the pressing jaws form a receiving region with a receiving region axis and wherein the inner contours each have two against the receiving region axis have inclined, facing surfaces which are formed as a cone segment. Furthermore, a method for the non-detachable joining of workpieces using a pressing tool will be described.

Press tools, attachments for pressing tools and methods of the type mentioned are already known from the prior art, for example from the drinking water or heating installation area. Preferably The tools and methods are used to radially compress workpieces such as fittings, pipes, sleeves or the like. Pressing radially means essentially to transform by means of a pincer-like closing movement of two pressing jaws exhibiting pivoting two two at least partially arranged in overlapping workpieces and thus inextricably linked together.

However, this procedure can be disadvantageous. With provided for this purpose pressing tools and methods, for example, the exercise of an all-round homogeneous pressing force on the workpieces to be pressed is much more difficult. Preferably, pipes and fittings have a rotationally symmetric and largely round shape before the pressing process. However, after the pressing process, this symmetry may be disturbed due to inhomogeneously acting pressing forces at the connection point between the pipe and the fitting, which on the one hand can impair the visual impression as well as the functionality of the connection.

Furthermore, the materials, especially plastics or metals of the claimed in the pressing workpieces can have a directed against the pressing forces inertia. This inertia can lead, in the form of restoring forces, to the fact that the material formed during the pressing process at least partially endeavors to restore the starting state or the starting structure of the workpieces. This requires the user of a radially inward pressing process to have to increase the radially inward pressing forces to obtain the desired pressing result. However, this is beyond the actual measure beyond and therefore basically undesirable use of the materials of the workpieces to be pressed dar.

The aforementioned problems can be solved or at least mitigated, in particular, by means of an axial compression technique. A homogeneous application of force is much easier to ensure in an axial pressing process. Although the restoring properties of the materials to be deformed also act in the axial direction, the effects of increased stress on the material can be kept low because of the axial expansion of the workpieces, which is usually long compared to the radial expansion. A disadvantage of axially acting pressing tools, however, is that they occupy a wide mounting space and have a high weight. The use of such tools or the application of such methods is difficult for the installer.

From the DE 27 25 280 A1 a press tool for a pipe joint of a pipe and a fitting sleeve is known, wherein the fitting sleeve has an inwardly radially open, containing a sealing ring annular bead. This annular bead is compressed with the pressing tool so that the sealing ring is pressed against the tube inserted into the fitting sleeve. The mold insert of the pressing tool in this case has conical side surfaces which bear against the sides of the annular bead during compression, cause the compression of the annular bead and deform the sealing ring radially.

Furthermore, from the DE 101 44 100 C1 a pressing tool with two radially mutually engageable pressing jaws for producing a permanent, tight pipe press connection known. The inner contours of the pressing jaws have wedge-shaped Surfaces, by means of which the conversion of a radial movement of the pressing jaws in an axial compression of the annular bead of a fitting can be effected.

From the GB 2 205 373 A For example, a joining tool is known which has two clamping elements with chamfered surfaces, which serve for the radial deformation of the workpiece.

From the DE 198 40 668 Cl is a pipe joint consisting of a press fitting element, which has at least one cross-sectionally bead-shaped, a sealing ring receiving portion, and from a tube which is inserted into the press fitting element known. The bead-like region is pressed radially with a pressing tool, so that the sealing element is pressed against the tube and thus produces a tight and permanent connection.

The present invention is therefore based on the technical problem of providing an alternative pressing tool, an attachment for a pressing tool, with which a permanent connection between workpieces by axial compression can be created.

The technical problem is solved with a pressing tool for non-detachable joining of workpieces of the type mentioned, characterized in that the surfaces of the inner contours are designed as sliding surfaces, that the sliding surfaces are provided for contact with arranged on the workpieces to be pressed surfaces and that the inclination angle the sliding surface is between 35 ° and 55 °, in particular at 45 °, relative to the receiving area axis.

The receiving area axis runs approximately perpendicular to the area lying between the inner contours of the pressing jaws surfaces and substantially corresponds to the axis of a insertable for the purpose of compression in the receiving area workpiece, such as a pipe or fittings.

By virtue of the sliding surfaces inclined towards the receiving area axis, the dynamics of a radially inwardly directed movement can be at least partially converted into a pressing force extending in the axial direction. During the pressing operation, the pivoting elements and in particular the pressing jaws are moved towards one another about the axis of rotation, while the workpieces to be pressed are arranged in the receiving area between the pressing jaws. The inner contours of the pressing jaws are brought into contact with surfaces arranged on the workpieces to be pressed. By continuing the radially inward movement, the area remaining between the workpieces and the inner contours is narrowed. The sliding surfaces in abutment with the workpieces thus act as force-transmitting and force-deflecting surfaces, because the sliding surface and the surface on the workpiece slide over one another while the workpiece is set in motion. In this way, although starting from a radially inward movement, a relative movement between the workpieces to be compressed in the axial direction can be generated and used for pressing.

As a result, a pressing tool can be provided which performs a compression in the axial direction, yet takes little mounting space and, for example, by a smaller axial expansion offers weight advantages.

It is possible to provide the inner contour of each pressing jaw with exactly one sliding surface, which, however, does not belong to the invention. In this case, however, the inner contour preferably also has a projection acting as an abutment, which is arranged opposite the sliding surface on the other side of the inner contour of the pressing jaw. Preferably, this projection can engage behind a portion of a workpiece to be compressed, in particular of the workpiece, which is not in contact with the sliding surface, and thus build up the counter-pressure necessary for the axial compression. A force deflection from a radially inward in an axial direction is not effected by the projection.

According to the invention, two sliding surfaces inclined towards the receiving area axis are provided. In this way, the deflected and applied for axial compression force can be increased. With symmetrical design of the two sliding surfaces and corresponding interaction surfaces on the workpieces, the deflected pressing force is for example doubled. It should be noted, however, that the design of the two sliding surfaces do not correspond to each other or must be symmetrical, but can also be carried out differently, if it is expedient for the application.

It is particularly advantageous if the sliding surfaces are designed as cone segments. In this way, in particular the production of the inner contours of the pressing jaws and optionally the production of workpieces with adapted to these pressing jaws interaction surfaces, which are provided for the previously described type of pressing, simplified. This can provide a high level of compatibility be achieved between the pressing tools described above and provided for the pressing workpieces such as pipes, fittings and the like.

The angle of inclination essentially determines the distance of the radially inward movement which is to be covered in order to effect an axial movement over a certain distance. The flatter the angle of inclination, the further the inner contour of the pressing jaw has to reach in the axial direction in order to achieve a certain pressing result, whereas the radial extent of the pressing jaw can be made quite narrow. An angle of, for example, 35 ° thus causes a quite effective from the radial movement force deflection, whereas an angle of 55 °, although a longer radial path result, but ensures a higher stability during compression. The angle of 45 °, in turn, is particularly suitable to compensate between the two effects. In addition, the outer dimensions of the pressing jaws can be optimized in this way both in the radial and in the axial direction.

It is further particularly preferred that the sliding surface is designed to promote sliding. In this way, the inertia, which oppose the workpieces to be compressed to an axial evasive movement, at least be reduced, so that the pressing operation is easier to perform. The sliding surface to form sliding, can be done in different ways. It is possible to form the portion of the inner contour of the pressing jaw, which comprises the sliding surface, in two parts with the rest of the pressing jaw, and to manufacture the sliding surface of a material such as polytetrafluoroethylene or the like. However, it is also possible, the sliding ability by means of a slip-promoting coating to increase the sliding surface, for example with a lubricating paint coating. Likewise, it is possible, by smoothing the sliding surface, for example by polishing the sliding surface to form this slide-promoting.

According to a further teaching of the present invention, the technical problem is also solved by an attachment for a pressing tool of the type mentioned above in that the surfaces are designed as sliding surfaces, that the sliding surfaces are provided for an abutment arranged on the surfaces to be pressed workpieces and that the angle of inclination of the sliding surfaces relative to the receiving area axis is between 35 ° and 55 °, in particular at 45 °.

In this way, originally provided for the radial compression pressing tools can be made suitable for axial compression in a simple manner. The new production of the changed requirements correspondingly adapted pivoting elements is therefore no longer necessary, resulting in particular economic benefits.

With regard to further advantages of the article according to the invention for pressing tools, reference is made to the subclaims or to the comments on the pressing tool according to the invention.

The technical problem is also solved by a method for non-detachably joining workpieces using a pressing tool, in particular as described above, in which the pressing tool is actuated radially inwards, in which at least one sliding surface inclined to the workpiece axis and a workpiece surface arranged on the pressing tool come into contact brought to each other, wherein the radial transmitted inwardly exerted pressing force from the sliding surface on the workpiece surface and is at least partially deflected in the axial direction and in which the workpieces are pressed in the axial direction.

The sliding surface preferably faces a correspondingly adapted workpiece surface. As a result, in particular a larger contact surface between sliding surface and workpiece surface is created. In this way, for example, the stability of the pressing process can be increased.

Preferably, the deflection is effected via an angle between 35 ° and 55 °, in particular 45 °.

With regard to further advantages of the method, reference is made to the statements on the pressing tool according to the invention and the attachment according to the invention for pressing tools.

Fig. 1a,b

ein Ausführungsbeispiel des Presswerkzeugs vor dem Pressvorgang in zwei unterschiedlichen Ansichten,

Fig. 2a,b

das Ausführungsbeispiel des Presswerkzeugs aus den Fig. 1a, b nach dem Pressvorgang in zwei unterschiedlichen Ansichten und

Fig. 3

ein weiteres Ausführungsbeispiel der Anwendung eines erfindungsgemäßen Presswerkzeugs.

In the following the invention will be explained in more detail with reference to embodiments illustrated in a drawing. In the drawing show:

Fig. 1a, b

An embodiment of the pressing tool before the pressing process in two different views,

Fig. 2a, b

the embodiment of the pressing tool from the Fig. 1a, b after the pressing process in two different views and

Fig. 3

a further embodiment of the application of a pressing tool according to the invention.

Fig. 1a shows a pressing tool 2 in a side view. The pressing tool 2 has two pivoting elements 4, which are pivotable about an axis of rotation 6 associated therewith. By providing two axes of rotation 6, the pivoting movements of the pivot elements 4 can be made more flexible. However, the provision of only one axis of rotation 6, to which both pivoting elements 4 are articulated, is also possible. By the pivot elements 4 in this example associated support members 8, the pivot elements 4 are interconnected. At a portion of the pivot elements 4 press jaws 10 are arranged, which form a receiving area 12 opposite to each other between them by means of their inner contours. Depending on the position of the pivoting elements 4, the receiving region 12 can be kept closer or closer to one another. In this exemplary embodiment, a tube end 16 encompassed by a sleeve 14 and a fitting 18, which are particularly suitable for axial compression, are introduced into the receiving region 12. The sleeve 14 is connected to the tube 16 by fixing protrusions (not shown) disposed on the inner peripheral surface of the sleeve 14, which are anchored in the outer circumferential surface of the tube 16, so that the sleeve 14 and the tube 16 are not movable relative to each other.

The following describes the pressing process. Of course, the pressing tool 2 according to the invention or the method is not limited to the use of the tubes 16, sleeves 14 or fittings 18 exemplified here.

The swivel elements 4 shown here by way of example can also be provided with removable pressing jaws 10. In this way, by means of an attachment according to the invention for a Pressing tool 2 already manufactured pressing tools 2, which were originally intended for a radial compression, are also made suitable for axial compression.

Fig. 1b shows in a cross-sectional view of the arrangement Fig. 1a a fitting 18, a sleeve 14 and a tube 16 before a permanent connection between these three workpieces 14, 16, 18 is made.

The inner contours of the pressing jaws 10 have, in this example, two inclined sliding surfaces 22 inclined towards the receiving area axis 20. Both sliding surfaces 22 are formed in this example as cone segments. However, other shapes are also conceivable. In particular, the angle of inclination of the sliding surfaces 22 can be chosen freely. However, the inclination angle of the sliding surfaces 22 relative to the receiving area axis 20 in this example is constant at about 45 °. However, deviations from this value, for example up to 35 ° or 55 ° or possibly beyond, are also possible. In this embodiment, not shown, the sliding surfaces 22 may be formed, for example, by means of a slide to promote sliding.

The fitting 18 has centrally on its base a recess 24 with bevelled side walls. The angle of inclination of the side walls in this example is advantageously adapted to the angle of inclination of the sliding surfaces 22 on the pressing jaws 10. Further, the sleeve 14 at its flange-like projection on a chamfer 26, which is also adapted to the inclination angle of the sliding surfaces 22, so in this example about 45 °. In this way, the pressing process can be stabilized in particular. Before the pressing process, the sliding surfaces 22 are in contact with the previously mentioned workpiece surfaces, such as the chamfer 26 of the sleeve 14 or the side wall of the recess 24 of the fitting 18th

Fig. 2a shows the state of the pressing tool 2 and the workpieces 14, 16, 18 after the pressing process in a side view. The pivot elements 4 are pivoted inwardly, so that the abutment surfaces 28 of the pressing jaws 10 abut each other.

Fig. 2b turns off the arrangement Fig. 2a In a cross-sectional view. By the radially inward movement of the pressing jaws 10, the force exerted was at least partially transmitted via the abutting sliding surfaces 22 and workpiece surfaces of the pressing tool 2 on the workpieces, in this example, the sleeve 14 and the fitting 18 and in deflected the axial direction. As a result, in this example, the sleeve 14 and the tube 16 connected to the sleeve 14 as well as the fitting 18 are moved toward one another, or in other words, pressed together.

After the axial pressing operation, a latching projection arranged on the outer circumferential surface of the sleeve 14 is latched in a latching groove arranged on the inner peripheral surface of the outer body of the fitting 18, so that axial removal of the tube end 16 from the fitting 18 engaged by the sleeve 14 is not possible.

The permanent connection is made with it. An axial movement of the tube 16 out of the fitting 18 is prevented by the latching. The support body of the fitting 18 was in the inner peripheral surface of the tube during the pressing operation 16 at least partially formed and thus seals the connection between the pipe 16 and fitting 18, for example, compared to in the tube 16 under pressure pressurized fluids (not shown) from.

As a result, a pressing tool 2 has been used which, despite the radial output movement of the pressing jaws 10, performs a pressing in the axial direction, requires little installation space and, in particular, offers improved handiness.

Fig. 3 shows in a cross-sectional view of an assembly of a pipe 16, a support body having a fitting 18, wherein the support body engages the tube 16, a arranged on the tube outer peripheral surface transmission element 30 which is a wedge shape in cross section and at the wider end of the wedge an opening 32 to has visual control of the pressing state, and a voltage applied externally to the transmission element 30 sliding sleeve 34, which is also formed in cross-section also approximately wedge-shaped, but at the wider end has a flange-like projection 36. The flange-like projection 36 of the sliding sleeve 34 has a chamfer 38, the surface of which is provided for interaction with one of the sliding surfaces 22 of the pressing jaws 10 shown schematically in this example. The sliding sleeve 34 includes an opening for visually checking the pressing state of the workpieces 16, 18, 30 and 34. The fitting 18 has on its base a recess 24 with an inclined wall surface, wherein the inclination of the inclined wall surface to the inner contour of the pressing jaws 10th is adjusted.

The pressing jaws 10 in this example comprise two mutually facing sliding surfaces 22, which are formed as cone segments, and have an angle of inclination relative to the receiving area axis 20 of about 60 °. By choosing this slightly higher angle, in particular the stability of the pressing process can be improved.

During the pressing operation, the sliding surfaces 22 of the pressing jaws 10 interact with the inclined wall surfaces on the recess 24 of the fitting 18 and with the chamfer 38 of the flange-like projection 36 of the sliding sleeve 34. The dynamics brought about by a radially inward movement of the pressing jaws 10 is transmitted via the sliding surfaces 22 transmitted to the sliding sleeve 34 and the fitting 18, so that the fitting 18, the sliding sleeve 34 and thus also the transmission element 30 are pushed together in the axial direction. The wedge-shaped design of the sliding sleeve 34 and the transmission element 30 and their conditioning effect that the pressing forces are transmitted during the pressing operation on the Rohraußenumfangsfläche and at least partially redirected in the radially inward direction. Thereby, the tube 16 is pressed to the support body of the fitting 18, wherein material of the tube 16 is formed in particular in arranged on the outer peripheral surface of the support body recesses 40, so that an axial movement after the completion of the pressing operation is prevented. In this way, thus a permanent permanent connection between a pipe 16 and a fitting 18 can be created.

Claims (2)

1. A pressing tool (2) for the permanent connection of workpieces by transforming a radially inwardly performed movement at least partially into a pressing force extending in axial direction to generate a relative movement between two workpieces to be pressed together,

   - with two pivot elements (4), each of them having one pressing jaw (10), and

   - with at least one rotational axis (6) on which the pivot elements (4) are hinged,

   - wherein the inner contours of the opposing pressing jaws (10) form a receiving area (12) with a receiving area axis (20), and

   - wherein each of the inner contours have two faces (22) which are inclined in respect to the receiving area axis (20), which face one another, and which

   - are formed as a cone segment
   characterized in

   - that the faces (22) are configured as sliding planes,

   - that the slide faces (22) are intended to be brought into abutment to the areas of the workpieces to be pressed together, and

   - that the inclination angle of the slide faces (22) lies between 35° and 55°, in particular 45°, relative to the receiving area axis (20).
2. An attachment for a pressing tool (2) for the permanent connection of workpieces by transforming a radially inwardly performed movement at least partially into a pressing force extending in axial direction to generate a relative movement between two workpieces to be pressed together- with two pressing jaws (10),

   - wherein each pressing jaw (10) has an inner contour,

   - wherein the opposing inner contours of the pressing jaws (10) form a receiving area (12) with a receiving area axis (20), and

   - wherein the inner contours each have two faces that are inclined in respect to the receiving area axis, face each other, and are formed as a cone segment,characterized in

   - that the inclination angle of the slide faces (22) lies between 35° and 55°, in particular 45°, relative to the receiving area axis (20).

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