Gripping device

Abstract

The invention relates to a gripping device (1; 71; 91) for gripping thin-walled aerosol can blanks (1), comprising a base body (3; 81; 98) made of a material with a fixed outer shape and penetrated by a bore (14) along a central axis (12), wherein the inner surface of the bore (14) is provided with a circumferential, radially outwardly extending radial groove (5; 87; 99), and a rubber-elastic gripping ring (4; 72; 72) accommodated in the radial groove (5; 87; 99), which has a radially inner gripping face (19; 86; 102) and a radially outer working face (20; 74; 94), wherein the working face (20; 74; 94) together with axially opposite axial faces (34) of the radial groove (5; 87; 99) and a radially outer peripheral face (44) of the radial groove (5; 87; 99) delimits a fluidic working space (45; 84; 100). According to the invention, a one-piece, moulded, circumferential sealing profile (43; 88; 103) is adjoined at the working face (20; 74; 94) of the gripping ring (4; 72; 72).

Description

Technical Field

[0001] This invention relates to a gripping device for gripping thin-walled aerosol can blanks, the gripping device comprising: a base made of a material with a fixed shape and the base being penetrated by a hole along a central axis, wherein the inner surface of the hole is provided with a radially extending groove extending outward in a radial direction; and a gripping ring made of a rubber-elastic material and housed in the radial groove, the gripping ring having a gripping surface radially inward for abutting against the aerosol can blank and a working surface radially outward, wherein the working surface, together with the axial surface of the radial groove opposite to each other and the radially outward peripheral surface of the radial groove, restricts the fluid working space, particularly the compressed air working space. Background Technology

[0002] JP H09 19731 A discloses a container holding element in which a base has an annular groove at its inner periphery, in which a container holding element is accommodated. The container holding element is made of an elastic material and is free to move in the radial direction. The container is secured by applying radially inward pressure to the outer back side of the container holding element through an air supply in a channel limited by the container holding element and the groove. Summary of the Invention

[0003] The purpose of this invention is to provide a gripping device that grips aerosol can blanks with uniform surface compression.

[0004] This objective is achieved by constructing a one-piece molded, surrounding sealing portion adjacent to the working surface at the gripping ring. This sealing portion ensures that the gripping ring is sealed within the radial groove and thus restricts the fluid working space. Advantageously, the one-piece molding of the sealing portion at the gripping ring reduces the number of required sealing surfaces, as these surfaces, which would otherwise be necessary between the radial groove and the gripping ring in a separate sealing device construction, as is known in the prior art, can be eliminated. Consequently, the pressure acting on the working surface of the gripping ring can be advantageously transferred to the aerosol can blank to be temporarily secured. In particular, the gripping ring can be designed in such a way that a desired uniform force transfer from the gripping ring to the outer surface of the aerosol can blank is ensured.

[0005] Advantageous improvements of the present invention are described in the dependent claims.

[0006] Preferably, the sealing molding portion has two molding regions arranged symmetrically with respect to a plane of symmetry, wherein the plane of symmetry is oriented transversely to the central axis. Each molding region is configured to seal against a side of the radial groove that is oriented at least substantially axially, thereby ensuring the desired sealing effect between the substrate and the gripping ring. Preferably, the opposing sides of the radial grooves are oriented parallel to each other and are each configured as a planar annular surface, at which the corresponding molding region can seal against.

[0007] Preferably, the working surface has a greater extension in the axial direction than the gripping surface, and the portion of the working surface extending beyond the gripping surface along the central axis forms an annular segment coaxial with the forming area. In this design of the gripping ring, on the one hand, the increased working surface compared to the gripping surface is used to advantageously introduce pressure onto the gripping surface. On the other hand, it can be configured such a portion of the working surface extending axially beyond the gripping surface is used to transmit pressure, and thus to introduce force radially inwardly onto the corresponding forming area.

[0008] In an improved embodiment of the invention, the molding region is configured such that it has at least one radially inwardly pointing sealing surface, which is constructed to seal tightly against a radially outwardly oriented, particularly cylindrical, support surface of the substrate. Advantageously, the sealing effect between the respective molding region and the substrate is caused by a radially inwardly acting pressure. Thus, the relative movement of the sealing ring between the release position of the aerosol can blank (in which the sealing ring has a larger inner diameter) and the locking position of the aerosol can blank (in which the sealing ring has a smaller inner diameter) is only minimally affected by friction or preferably completely unaffected by friction. Conversely, the sealing ring can be transferred from the release position to the locking position at least largely frictionlessly by the action of pressure, wherein the complete sealing effect of the sealing ring relative to the substrate exists only in the locking position. However, this is practically irrelevant given the small amount of fluid required to transfer the sealing ring from the release position to the locking position. Furthermore, this design of the sealing ring achieves a valve function because when the fluid pressure in the fluid working space decreases, the sealing effect between the inward-pointing sealing surface of the sealing ring and the outward-pointing supporting surface of the base is canceled as the elastic recovery deformation of the sealing ring from the locked position to the released position begins. As a result, the working fluid additionally leaks out of the fluid working space through the gap released by the recovery deformation between the sealing ring and the base. This behavior is particularly advantageous when using compressed air as the working fluid.

[0009] In another design embodiment of the invention, the molding region is configured such that a first sealing surface with a first inner diameter pointing radially inward and a second sealing surface with a second inner diameter pointing radially inward, wherein the first inner diameter is larger than the second inner diameter, and a first support surface oriented radially outward and opposite to the first sealing surface and a second support surface oriented radially outward and opposite to the second sealing surface are constructed at the base. This advantageously pre-establishes a sealing effect between the sealing ring and the base when the fluid working space is loaded with a pressure-loaded working fluid, and also advantageously pre-establishes a sealing effect between the sealing ring and the base when the pressure of the working fluid in the working space decreases. For example, it can be configured such that, starting from the release position of the sealing ring, when the fluid working space is pressure-loaded, the second sealing surface, arranged at a larger spacing with the gripping surface in the axial direction, first abuts against the oppositely arranged end face, while the first sealing surface, arranged at a smaller spacing with the gripping surface, abuts against the oppositely arranged end face only when the fluid working space is subjected to increasingly larger pressure loads. Here, the second sealing surface ensures a temporary seal in the fluid working space, wherein the relative movement of the central region of the sealing ring (which together includes the gripping surface) is initially not significantly affected. Preferably, the first sealing surface at the base and the opposite support surface, as well as the gripping surface and the aerosol can blank to be gripped, are coordinated such that the sealing ring experiences only the smallest possible bulge for the gripping surface as it approaches the locking position, so as to ensure the most uniform surface compression possible across the entire gripping surface between the gripping surface and the aerosol can blank.

[0010] Preferably, the axial extension of the first sealing surface is greater than the axial extension of the first support surface and / or the axial extension of the second sealing surface is less than the axial extension of the second support surface. This measure should ensure that the sealing ring can always move largely without friction between the released position and the locked position, as well as in the opposite direction.

[0011] Advantageously, the spacing between the opposing axial faces of the radial grooves is greater than the spacing between the opposing axial annular faces of the gripping rings, which are adjacent at the gripping surface and opposing the axial faces respectively. This measure ensures substantially frictionless relative movement of the sealing rings between the release and locking positions.

[0012] In an alternative first embodiment of the invention, each molding region in the molding area is configured such that an extension ring extending radially outward from the working surface and a retaining ring radially externally arranged at the extension ring, wherein the extension ring and the retaining ring are coaxially arranged with a central axis, wherein the extension of the extension ring along the central axis is less than 50% of the extension of the retaining ring along the central axis, and wherein the retaining ring is at least partially abutted against a radially outwardly pointing support surface of the substrate, particularly fixedly positioned at the substrate. In this embodiment of the gripping device, the gripping ring has an inner ring, the inner surface of which forms a gripping surface, and the outer surface of which forms a working surface. Preferably, the inner ring is configured such that its axial extension is less than the distance between the opposing axial surfaces of the radial grooves. To ensure reliable centering of the inner ring in the substrate on the one hand, and to ensure the required seal between the gripping ring and the radial grooves on the other hand, two spaced-apart extension rings extend from the working surface, each extension ring being connected to a retaining ring radially externally arranged. Here, the retaining ring is configured to ensure the gripping ring is fixed to the base and to seal the fluid working space. An extension ring serves as a flexible connection between the retaining ring, which is preferably fixed to the base, and the inner ring, which is relatively movable relative to the base.

[0013] In an improved embodiment of the first alternative of the invention, the molding region formed by the extension ring and the retaining ring has a T-shaped portion in a cross-sectional plane including the central axis, and / or the molding region is accommodated in a peripheral groove of the substrate, which also has a T-shaped portion in a cross-sectional plane including the central axis and has two radially outwardly oriented cylindrical support surfaces spaced apart from each other along the central axis for form-fitting contact with the radially inwardly pointing cylindrical retaining surface of the retaining ring. The T-shaped portion of the molding region and the corresponding T-shaped portion of the peripheral groove in the substrate ensure reliable support of the gripping ring at the substrate. This is because the tension applied to the correspondingly associated retaining ring via the extension ring by the inner ring can be transmitted at least largely symmetrically from the retaining ring to the opposing cylindrical support surfaces of the substrate. This, in particular, avoids the undesirable tipping of asymmetrically constructed retaining rings, as this might occur especially in the case of L-shaped portions of the retaining ring.

[0014] In an alternative second embodiment of the invention, the forming region is configured to be radially wedge-narrowed outward in a cross-sectional plane including the central axis, and separated from the working surface by a particularly semi-circular groove introduced radially inward into the gripping ring, and configured to seal against the opposing axial surfaces of the radial groove. Here, the forming region is constructed as a lip seal, which is one-piece molded into the inner ring, and this lip seal undergoes a pivoting movement of its radially externally arranged end regions when the fluid working space is pressure-loaded, thereby ensuring a sealing fit of the forming region at the respective adjacent axial surfaces of the radial groove. The groove introduced into the working surface adjacent to the forming region has the function of disengaging the corresponding forming region from the working surface in such a way that the desired pivoting movement of the radially externally arranged end regions of the forming region results in a reliable sealing effect on the fluid working space when the gripping device is used as specified.

[0015] Advantageous for all embodiments of the invention is that the substrate has an interface section preferably constructed with rotational symmetry about the central axis, the interface section being configured to connect with a receiving portion at the workpiece turntable of a processing machine, particularly a necking machine. Attached Figure Description

[0016] Advantageous embodiments of the invention are shown in the accompanying drawings. Wherein: Figure 1 A schematic cross-sectional view of a first embodiment of the gripping device is shown. Figure 2 A detailed view of the molded portion of the gripping ring is shown. Figure 3 A schematic cross-sectional view of a section of a second embodiment of the gripping device is shown, and Figure 4 A schematic diagram of a section of a third embodiment of the gripping device is shown. Detailed Implementation

[0017] exist Figure 1The first embodiment of the gripping device 1, shown schematically, is used to temporarily secure an aerosol can blank 2, which is only shown schematically and partially. The aerosol can blank 2 is preferably manufactured as a cylindrical sleeve made of aluminum alloy with a bottom on one side and a wall thickness significantly less than 0.1 mm. This aerosol can blank 2 is plastically deformed, for example, on a necking machine at its open end region, so that an injection valve (not shown) can be installed after the plastic deformation is complete. To perform such a plastic deformation process on a necking machine, the aerosol can blank 2 needs to be reliably secured to withstand the processing forces that occur during processing. Because the wall thickness of modern aerosol can blanks 2 is very small, the force transmission between the aerosol can blank 2 and the gripping device 1 needs to be carried out over the largest possible surface with the smallest possible surface compression to avoid collapse of the aerosol can blank 2.

[0018] The gripping device 1 includes a base 3, which is exemplarily composed of a plurality of components, wherein the components of the base 3, described in more detail below, are made of materials whose shape is fixed when the gripping device 1 is used as intended. Typically, metallic materials such as steel and aluminum, and plastic materials such as POM (polyoxymethylene) or PEEK (polyetheretherketone) are used for the components of the base 3. Furthermore, the gripping device 1 includes a gripping ring 4 made of a rubber-elastic material such as NBR (nitrile butadiene rubber), which is received in a radial groove 5 constructed in the base 3, and which can be released from the radial groove 5 when pressure-loaded fluid is supplied to it. Figure 1 The aerosol can blank 2 is transferred from the static position shown to the functional position, in which the aerosol can blank 2 is secured in the gripping device 1.

[0019] By way of example, the base 3 of the gripping device 1 includes a connecting portion 6, an intermediate ring 7, an outer ring 8, a guide ring 9, and a bottom ring 10. Here, the intermediate ring 7, guide ring 9, bottom ring, and gripping ring 4 are respectively held in predetermined positions by means of the outer ring 8, which is, by way of example, fixed at the connecting portion 6 by two fixing threads 11. The gripping ring 4 is accommodated with a certain degree of mobility in a radial groove 5 defined by the intermediate ring 7, outer ring 8, and guide ring 9. Correspondingly, the base 3 defines a notch or hole 14 extending along the central axis 12. Furthermore, the base 3 includes an interface section 55 constructed at the connecting portion 6, which is configured to fix the gripping device to a workpiece turntable (not shown) of a processing machine, particularly a necking machine.

[0020] As from Figure 1 As can be seen from the diagram, not only the radial groove 5 but also the gripping ring 4 are in contact with... Figure 1The cross-sectional planes of the planes shown in the figure, including the central axis 12, each have a shaped portion, which can be described in the broadest sense as W-shaped. It should be noted that the shaped portion of the gripping ring 4 and the shaped portion of the radial groove 5 are constructed at least geometrically nearly similarly, wherein the geometrical differences between the shaped portion of the gripping ring 4 and the shaped portion of the radial groove 5 are described in more detail below.

[0021] For example, according to Figure 2 The gripping ring 4 in the detailed drawing can be described as a combination of an inner ring 15 with a rectangular cross-section and an L-shaped ring 17, which is mounted symmetrically with respect to the mirror plane 16 at the inner ring 15. The forming ring 17 (also referred to as the forming area of ​​the gripping ring 4) has radially inwardly oriented L-shaped legs and forms a sealing forming part 43.

[0022] This is set up purely as an example, in the release position of the gripping ring 4, such as Figure 1 and Figure 2 As shown, the inner diameter 18 of the inner surface 19 of the gripping ring 4, also known as the gripping face, is slightly larger than... Figure 1 The outer diameter of the aerosol can blank 2 is schematically shown as 60. This ensures that if the gripping ring is in its released position, the aerosol can blank 2 is pushed into the gripping ring 4 with minimal friction.

[0023] The outer surface 20 of the gripping ring 4, which is radially located on the outside (also referred to as the working surface), has Figure 2 The outer diameter 21 is drawn in the figure, which corresponds to the smaller first inner diameter 22 of the peripheral surface 44 of the radial groove 5. Preferably, the outer surface 20 is configured as the circumferential surface of a cylinder. The second inner diameter 23 of the peripheral surface 44 of the radial groove 5 is larger than the outer diameter 21 of the outer surface 20, so that in the released position of the gripping ring 4, the annular channel 24 surrounding the outer surface 20 and the inner surface 25 of the intermediate ring 7 also remains free.

[0024] Each location in the molding ring 17 is provided with a first sealing surface 26 and a second sealing surface 27, both of which are purely exemplary cylindrical structures, wherein the first inner diameter 28 of the first sealing surface 26 is selected to be larger than the second inner diameter 29 of the second sealing surface 27. (See from...) Figure 2 As can also be seen from the image, the inner ring 15 has an axial extension 30. The first sealing surface 26 has an axial extension 31. The second sealing surface 27 has an axial extension 32.

[0025] For example, the radial groove 5, which is geometrically similar to the formed portion of the gripping ring 4, is designed such that frictional loss is minimized when the gripping ring 4 moves radially relative to the base 3. This is ensured, for example, by the spacing 33 between the axially oriented and opposite annular surfaces 34 of the intermediate ring 7 is greater than the axial extension 30 of the inner ring 15. Furthermore, the axial extension 35 of the radially outward-pointing first support surface 36 (which is constructed in the same manner at the intermediate ring 7 and the guide ring 9) is chosen to be smaller than the axial extension 31 of the first sealing surface 26. Furthermore, the axial extension 37 of the radially outward-pointing second support surface 38 (which is constructed in the same manner at the intermediate ring 7 and the guide ring 9) is chosen to be greater than the axial extension 32 of the second sealing surface 27.

[0026] Additionally, it can be set to, for example, from Figure 1 and Figure 2 As shown in the illustration, the first outer diameter 40 of the first support surface 36 (which is similarly constructed at the intermediate ring 7 and the guide ring 9, respectively) is chosen to be smaller than the first inner diameter 28 of the first sealing surface 26. Alternatively or supplementarily, it can be configured such that, for example, it can also be derived from... Figure 1 and 2 As can be seen from the illustration, the second outer diameter 41 of the second support surface 38 (which is similarly constructed at the intermediate ring 7 and the guide ring 9, respectively) is chosen to be smaller than the second inner diameter 29 of the second sealing surface 27.

[0027] These measures should ensure that, when the fluid working space 45, confined by the radial groove 5 and the outer surface 20 (also referred to as the working surface) of the gripping ring 4, is loaded, a frictionless relative movement of the gripping ring 4 relative to the base 3 occurs first. This relative movement can be considered as a contraction movement, and a reduction in the diameter of the gripping ring 4 is achieved during this relative movement. It should be considered that a certain degree of leakage is tolerated due to the geometric design of the gripping ring 4 and the radial groove 5, so that the pressure-loaded working fluid flowing into the fluid working space 45 flows out at least partially radially inward. However, in principle, this is the starting point: despite the presence of some leakage, the desired radial displacement of the gripping ring 4 still occurs, accompanied by a reduction in the diameter of the gripping ring 4. For example, the geometry of the gripping ring 4 and the radial groove 5 is coordinated such that, during the diameter reduction, the second sealing surface 27 first seals against the second support surface 38, thereby terminating the radially inward flow of the pressure-loaded fluid. Since the second sealing surface 27 is axially spaced from the inner ring 15, a radially inward displacement of the inner ring 15 is achieved when the fluid pressure in the fluid working space 45 further increases, without causing an undesirable bulge on the inner surface 19 of the inner ring 15, also known as the gripping surface. Therefore, the inner surface 19 makes surface contact with the outer surface 61 of the aerosol can blank 2 and thus can be forcefully secured to the gripping device 1.

[0028] However, this force-fit fixation of the aerosol can blank 2 in the gripping device 1 is typically achieved at the point in time when the bottom region 62 of the aerosol can blank 2 is force-fitted into the bottom ring 10, which is rotatably housed in the intermediate ring 7 and rotatably supported at the axial end face 50 of the connecting portion 6 via a needle roller bearing 49 (not shown in detail).

[0029] To induce the release of the aerosol can blank 2, pressure is depressurized within the fluid working space 45. This can be achieved by venting a valve (not shown) fluidly connected to the fluid working space 45 and controlled by a corresponding control device (also not shown), allowing the pressure-loaded working fluid, particularly compressed air, to leak from the fluid working space 45.

[0030] Due to the elastic properties of the rubber in the gripping ring 4, the gripping ring 4 elastically recovers its deformation from the locked position (not shown) to a position according to... Figure 1 and Figure 2In the release position, this release position is related to the increase in the diameter of the gripping ring 4. Correspondingly, the force-fit connection with the aerosol can blank 2 is eliminated, so that the aerosol can blank can be removed from the gripping device 1 by means of a removal tool (not shown). Particularly advantageously, when the pressure of the pressure-loaded working fluid in the fluid working space decreases due to the geometric characteristics of the gripping ring 4 and the radial groove 5 described in more detail above, the second sealing surface 27 releases an additional gap from the associated second support surface 38, through which the pressure-loaded working fluid can flow radially inward from the fluid working space 45, thereby achieving a faster recovery deformation of the gripping ring 4.

[0031] According to Figure 1 In an improved embodiment of the gripping device (not shown in detail), at least one radially inwardly pointing notch is constructed on the outer surface of the gripping ring 4, and a pin connected to the outer ring engages in the notch to ensure torsional protection of the gripping ring 4.

[0032] According to Figure 1 In a variant of the gripping device not shown in detail, the bottom ring and the middle ring are implemented as a single piece, wherein, in this case, the support for the rotatable movement of the bottom ring is omitted.

[0033] exist Figure 3 In the second embodiment of the gripping device 71 shown, the base 81 is provided with a substantially similar structure to that of the base 3, so the various components of the base 81 will not be described in more detail to avoid repetition. Consistent with the gripping ring 4, the gripping ring 72 has an inner ring 73 with a substantially rectangular cross-section. In the axial end region of the gripping ring 72, forming regions 76, arranged mirror-symmetrically with respect to a mirror plane 75, are respectively adjacent to the outer surface 73, also referred to as the working surface. These forming regions extend radially outward and form a sealing forming portion 88. Each of the forming regions 76 includes an extension ring 77 directly connected to the inner ring 73 and a retaining ring 78 externally mounted on the extension ring 77. For example, the radial extension of the extension ring 77 from the outer surface 74 is configured to substantially correspond to the radial extension of the inner ring 73. Furthermore, the axial extension of the extension ring 77 is configured, purely exemplarily, to correspond to less than 10% of the axial extension of the inner ring 73. In contrast, the axial extension of the retaining ring 78 is chosen such that it corresponds to at least twice the axial extension of the extension ring 77. Particularly preferably, the retaining ring 78 is arranged substantially centrally relative to the extension ring 77, thereby creating a substantially T-shaped formed portion for the forming region 76. The radial groove 87 in the base 81 for receiving the gripping ring 72 is at least partially constructed geometrically similar to the gripping ring 72.

[0034] As from Figure 3 As can be seen from the diagram, the radially inwardly pointing first and second sealing surfaces of the retaining ring 78 are supported at the opposing first and second support surfaces of the base 81 of the gripping device 71, thereby already according to Figure 3 The release position ensures a seal for the fluid working space 84. Through the geometric design of the extension ring 77 and retaining ring 78, when the fluid working chamber 84 is pressure-loaded and the diameter of the inner ring 73 decreases, the extension ring 77 undergoes substantial elastic deformation, while the retaining ring 78 maintains its shape stability at least to a large extent. Because the extension ring 77 has significantly greater elasticity compared to the inner ring 73 due to its geometric design, when the fluid working space 84 is pressure-loaded and this causes the inner diameter 85 of the clamping ring 71 to decrease, the cylindrical geometry of the inner surface 86 of the gripping ring 72 is maintained, allowing the inner surface 86 to face-fit against the aerosol can blank (not shown), without undesirable non-uniformity in the face compression between the inner surface 86 and the gripping ring.

[0035] exist Figure 4 In the third embodiment of the gripping device 91 shown, the gripping ring 92 and according to Figure 1 and 2 The gripping ring 4 has an inner ring 93 with a substantially rectangular cross-section. In the axial end region of the outer surface 94 of the cylindrical structure of the gripping ring 92, radially inwardly pointing peripheral grooves 96 are respectively introduced, arranged symmetrically with respect to the mirror plane 95. Exemplarily, each peripheral groove 96 has a semi-circular cross-section. The peripheral grooves 96 are positioned such that gradually wedge-shaped forming regions 97 are formed in the axial end region of the gripping ring 92, which have significantly greater flexibility than the rest of the gripping ring 92 due to the reduced material thickness, and these forming regions form sealing forming portions 103. When the fluid working space 100 (constructed between the gripping ring 92 and the radial grooves 99 introduced in the base 98) is pressure-loaded, the forming regions 97 sealably abut against the adjacent, exemplary annular surfaces 101 of the radial grooves 99, thereby ensuring the sealing of the fluid working space 100. When pressure is further built up in the fluid working space 100, the clamping ring 92 undergoes elastic deformation, which is accompanied by a reduction in the inner diameter 101 of the clamping ring 92, thereby causing a desired force fit and fixation of the aerosol can blank at the inner surface 102 of the gripping ring 92, also known as the gripping surface. (As from...) Figure 4 As can be seen from the diagram, radial groove 99 is based on Figure 4 The diagram shows a rectangular cross-section in the plane. Similarly, this also applies to the gripping ring 92, which does not have a complex geometry.

Claims

1. A gripping device (91) for gripping a thin-walled aerosol can blank (2), the gripping device comprising: a base (98) made of a material with a fixed shape and the base being penetrated by a hole (14) along a central axis (12), wherein, The inner surface of the hole (14) is provided with a circumferential radial groove (99) extending outward in the radial direction; and a gripping ring (92) made of a rubber-elastic material is accommodated in the radial groove (99). The gripping ring has a gripping surface (102) radially inward for abutting against the aerosol can blank (2) and a working surface (94) radially outward, wherein the working surface (94), together with the axial surface (34) of the radial groove (99) facing each other and the radially outward peripheral surface (44) of the radial groove (99), restricts the fluid working space (100). The gripping ring (92) is adjacent to the working surface (94). The grounding structure has a one-piece molded, surrounding sealing molding part (103), wherein the sealing molding part (103) has two molding areas (97) arranged symmetrically with respect to a plane of symmetry (95), wherein the plane of symmetry (95) is oriented transversely to the central axis (12), characterized in that the molding area (97) is constructed to be radially outwardly wedge-shaped in a cross-sectional plane including the central axis (12), and is separated from the working surface (94) by a groove (96) radially inwardly introduced into the gripping ring (92), and is constructed to seal against the opposite axial surface of the radial groove (99).

2. The gripping device (91) according to claim 1, characterized in that, The substrate (98) has an interface section (55) configured to connect with a receiving portion at the workpiece turntable of the processing machine.

3. The gripping device (91) according to claim 1, characterized in that, The fluid working space (100) is a compressed air working space.

4. The gripping device (91) according to claim 1, characterized in that, The groove (96) is semi-circular in shape.

5. The gripping device (91) according to claim 2, characterized in that, The interface section (55) is constructed in a rotationally symmetrical manner with respect to the central axis.

6. The gripping device (91) according to claim 2, characterized in that, The processing machine is a necking machine.

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