JP2007283404A - Assembly caulking metallic plate-like body and column-like body, method and apparatus for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caulked assembly, in which it is not necessary to provide a flange part in the midway of a column-like body and to manufacture a complicated special shape, which can be manufactured easily and inexpensively and can keep sufficient assembling strength even when it is a thin plate-like body, a method and an apparatus for manufacturing the assembly. <P>SOLUTION: This method comprises: a stage where a mounting hole 20 for inserting and assembling the column-like body 3 into the metallic plate-like body 2 is provided and also a thick part 21 is formed along the inner periphery of the mounting hole; a stage where a peripheral groove 30 having a prescribed depth in the assembling position of the outer peripheral surface of the column-like body which is inserted into the mounting hole of the metallic plate-like body; a stage where the column-like body is inserted into the mounting hole of the metal plate-like body and the thick part and the peripheral groove are set in the opposing assembling positions and a caulking stage where the thick part is made to bite into the peripheral groove of the column-like body by plastically deforming the thick part in the center direction of the mounting hole by compressively pressing the thick part from the axial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high-strength caulking technique capable of firmly fixing a metal plate-like body and a hollow or solid columnar body.

  Conventionally, this type of plate-like body and columnar body is crimped by forming a flange portion in the middle of the shaft body side as a shaft caulking as in Patent Document 1, and on the plate-like body side that is the press part to be assembled. Drill a round hole and squeeze the tip of the shaft through which this round hole is inserted with a special caulking machine, and assemble the press part between the crushed shaft head and the flange, Alternatively, a more complicated special shape is formed on the shaft body side, and the shaft body is press-fitted into a round hole opened in the press part and joined.

However, in order to sandwich the pressed part with the crushed shaft body head, a large flange must be provided in the middle of the shaft body, and the shaft material is about 50% thicker than the shaft diameter required for product use. It is necessary to cut out and produce a flange shape, which increases material cost and processing cost. In addition, the production cost also increases for the formation of special shapes, and there is a limit to cost reduction.
JP 2003-260529 A

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem by providing a flange part in the middle part of a columnar body such as a shaft body or producing a complicated special shape easily and at a low cost. It is in the point which provides the crimping | assembling assembly | attachment which can be manufactured by this, and can maintain sufficient assembly | attachment intensity | strength even if it is a thin plate-shaped object, and its manufacturing method.

  The present invention is a method for producing a caulking assembly of a metal plate and a hollow or solid columnar body for solving the above-mentioned problem, wherein the columnar body is inserted into the metal plate body. Mounting holes for assembling, and forming a thick portion along the inner peripheral edge of the mounting holes, and mounting positions on the outer peripheral surface of the columnar body inserted into the mounting holes. A step of forming a groove, a step of inserting the columnar body into an attachment hole of the metal plate-like body, and setting the thick portion and the circumferential groove at an assembly position facing each other; And a caulking process in which it is bitten into the circumferential grooves of the opposing columnar bodies by being subjected to compression pressing and plastically deforming in the direction of the center of the mounting hole, and a method for producing a caulking assembly comprising the caulking assembly.

  Here, it is preferable that the thick part of the mounting hole is formed by burring.

  Also, a support having an insertion hole for slidingly guiding the columnar body, and abutting and supporting the thick portion of the metal plate-like body set on the columnar body from one side in the axial direction, and the thick portion It is preferable to compress and press the thick portion with a pressure punch that directly or indirectly presses the shaft from the other side in the axial direction.

  Furthermore, it is preferable that a plurality of concave and convex grooves extending in the direction intersecting the circumferential direction are formed in the peripheral groove of the columnar body over the entire circumference by concave and convex processing.

  The present invention also relates to a manufacturing apparatus for caulking assembly of a metal plate-like body and a hollow or solid columnar body, wherein the mounting holes for inserting and assembling the columnar body into the metal plate-like body And means for forming a thick portion along the inner peripheral edge of the mounting hole, and means for forming a circumferential groove having a predetermined depth at the assembly position of the outer peripheral surface of the columnar body inserted into the mounting hole. The columnar body is inserted into the mounting hole of the metal plate-like body, and the thick wall portion and the circumferential groove are set at an assembly position facing each other, and the thick wall portion is compressed and pressed from the axial direction. There is also provided an apparatus for manufacturing a caulking assembly, characterized by comprising caulking means that bite into the circumferential grooves of the opposing columnar bodies by plastic deformation in the hole center direction.

  Here, it is preferable that the thick part of the mounting hole is formed by burring, and the thickness of the metal plate-like body set in the columnar body has an insertion hole for slidingly guiding the columnar body. The thick part is compression-pressed by a support that abuts and supports the thick part from one side in the axial direction and a pressure punch that directly or indirectly presses the thick part from the other side in the axial direction. Is preferred.

  The present invention is a caulking assembly comprising a metal plate-like body and a hollow or solid columnar body, provided with mounting holes for inserting and assembling the columnar body into the metal plate-like body, A thick wall portion is formed along the inner periphery of the mounting hole, a circumferential groove having a predetermined depth is formed at the assembly position of the outer peripheral surface of the columnar body inserted into the mounting hole, and the columnar body is made of a metal plate. In a state where the thick wall portion and the circumferential groove are set at an assembly position where the thick wall portion and the circumferential groove face each other, the thick wall portion is compressed and pressed from the axial direction to be plastically deformed toward the center of the mounting hole. The caulking assembly is also provided, characterized in that it is fixed by being bitten into the circumferential grooves of the opposing columnar bodies.

  According to the present invention as described above, there is no need to provide a flange portion in the middle of the columnar body or to create a complicated special shape, and the columnar body can be easily provided with a circumferential groove, and the plate-shaped body is attached. By simply providing a thick part that can be easily formed around the hole, it is possible to assemble the plate-like body and the columnar body with simple press work and at low cost. In addition, since the thick part of the plate-like body is formed and plastically deformed and bites into the circumferential groove, sufficient caulking strength can be obtained at the same time, and the strength of the plate-like body itself can be obtained. Even if it is a thin plate-like body, the same high caulking strength as before can be obtained. By simplifying the shape of the shaft in this way, the cost can be reduced by about 20 to 70% compared to the conventional case.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a metal plate-like body 2 and a columnar body 3 used in a caulking assembly according to the present invention, FIGS. 1 to 5 show a first embodiment of the manufacturing method, FIG. 6 shows a second embodiment, and FIG. 7 shows a third embodiment. In the figure, reference numeral 1 denotes a caulking assembly, 2 denotes a plate-like body, and 3 denotes a columnar body.

  The caulking assembly 1 according to the present invention is a caulking assembly in which a metal plate 2 and a hollow or solid columnar body 3 are assembled by caulking, as shown in FIG. Although it is suitable for electronic parts etc., it is needless to say that it can be applied to various other parts and products.

The plate-like body 2 is provided with a mounting hole 20 for inserting and assembling the columnar body 3, and a thick portion 21 is formed along the inner periphery of the mounting hole. In the following description, the hole edge portion is erected in one direction by burring to form the thick portion 21, but it may be processed into other shapes.
Further, the columnar body 3 is formed with a circumferential groove 30 having a predetermined depth on the outer peripheral surface.

  And as demonstrated in 1st-3rd embodiment, the columnar body 3 is inserted in the attachment hole 20 of the plate-shaped body 2, and the thick part 21 is made into the state where the thick part 21 and the circumferential groove 30 were facing. By compressing and pressing from the axial direction, the thick portion 21 is plastically deformed toward the center of the hole, and is fixed by biting into the gap S in the circumferential groove 30.

  Specifically, the plate-like body 2 is provided with a mounting hole for inserting and assembling the columnar body 3, and a burring portion that forms a thick portion by burring along the inner peripheral edge of the mounting hole; Inserting the columnar body 3 into the mounting hole 20 of the plate-like body 2 at the assembly position of the outer peripheral surface of the columnar body inserted into the mounting hole and inserting the columnar body 3 into the mounting hole 20 of the plate-like body 2 Mounting means for setting the portion 21 and the circumferential groove 30 to be opposed to each other, and compression-pressing the thick portion 21 from the axial direction and plastically deforming in the center direction of the mounting hole, thereby opposing circumferential grooves in the columnar body It is processed using a manufacturing apparatus provided with a caulking portion that bites into.

  As shown in FIGS. 2 to 4, the structure of the caulking portion has an insertion hole 40 through which the columnar body 3 can be slid and guided, and supports the thick portion 21 of the plate-like body 2 from below. The support holder 41, the outer shape holder 42 that supports the plate-like body 3 while being urged upward at the periphery of the mounting hole 20, and the thick portion 21 directly or indirectly from the other side in the axial direction. The press punch 43 is configured to be pressed.

  Hereinafter, the manufacturing method of 1st Embodiment is demonstrated based on FIGS.

  First, an attachment hole 20 for inserting and assembling the columnar body 3 is provided in the plate-like body 2, and a thick portion 21 is formed along the inner peripheral edge of the attachment hole 20. The plate-like body 2 only needs to have at least the mounting holes 20 formed in the plate-like portion and the thick portion 21 thereof, and other portions may have a structure other than the plate-like shape.

  On the other hand, a circumferential groove 30 having a predetermined depth is formed on the outer peripheral surface of the columnar body 3 inserted into the mounting hole 20 at an assembly position where the plate-like body 2 is to be attached. Moreover, in this example, the flange part 31 is formed in the columnar body edge part.

  The depth of the circumferential groove 30 is set to a size such as the thickness of the plate-like body 2 and the outer diameter of the shaft so that sufficient strength can be maintained in a state where the thick-walled portion 21 of the plate-like body 2 is bitten and fixed. It is set accordingly. The columnar body 3 only needs to have a circumferential groove 30 formed on at least the outer peripheral surface, and other portions may have a structure other than the shaft shape.

  In this example, the shape of the mounting hole 20 in which the thick portion 21 of the plate-like body 2 is formed is a circular shape, and the columnar body is a shaft body having a circular outer peripheral surface that is inserted in the columnar body. The shape is not limited to such a shape. For example, even in a columnar body 3 such as a cross-sectionally irregular shape, an arc shape, or a square shape, as shown in FIG. The plate-like body 2 can be assembled. Moreover, both shapes do not need to be the same, for example, the columnar body 3 has a polygonal cross-sectional view, and the mounting hole 20 circumscribes it, or the columnar body 3 has a circular cross-sectional view and the mounting hole 20. It is also preferable to use a polygon circumscribing this. The columnar body 3 may be solid, or may be a cylindrical body such as an automobile frame or a pillar in which a thin plate is formed into a cylindrical shape. In this case, the circumferential groove can be easily formed by pressing. .

  The plate-like body 2 that plastically deforms the thick-walled portion 21 is made of metal, but the columnar body 3 is made of various materials such as synthetic resin, ceramics, wood, and composite fibers in addition to metal. Can be applied.

  Next, as shown in FIG. 2, a lower support 41 having an insertion hole 40 through which the columnar body 3 can be slidably guided and supporting the thick portion 21 of the plate-like body 2 from below, The plate-like body 2 is attached to a caulking jig 4 constituted by an outer shape holder 42 that supports the plate-like body 3 while being spring-biased upward at the periphery of the mounting hole 20. The columnar body 3 is inserted into the mounting hole 20 and the insertion hole 40 of the lower support 41 with the flange portion 31 facing upward, and the flange portion 31 is set in a state of being locked to the upper surface of the mounting hole 20. As a result, the thick portion 21 and the circumferential groove 30 face each other.

  In this example, the thick portion 21 formed by the burring process is set to face downward and the end thereof is in contact with the lower support 41. However, it is of course possible to set it upward.

  Then, the pressing punch 43 is pressed down from above on the plate-like body 2 and the columnar body 3 set on the crimping jig 4, and the thick-walled portion 21 is supported by the lower support through the flange portion 31 of the columnar body 3. 41 and compression pressed. As a result, the thick portion 21 is plastically deformed toward the center of the mounting hole as shown in FIG. 3 and bites into the gap S in the circumferential groove 30 of the opposing columnar body. As shown in FIG. 4, the thickened portion 21 plastically deformed fills the inside of the circumferential groove 30, and the crimped assembly 1 in which the plate-like body 2 and the columnar body 3 are firmly integrated is obtained.

  Next, the manufacturing method of 2nd Embodiment is demonstrated based on FIG.

  Although 1st Embodiment demonstrated what provided the flange part 31 which protrudes from an outer diameter to the columnar body 3, the method of assembling the columnar body 3 and the plate-shaped body 2 without providing such a flange part in this embodiment. Will be described.

  A flange portion 31 protruding beyond the outer diameter is not formed at the end of the columnar body 3. As shown in FIG. 6A, the end of the columnar body 3 has the same outer diameter as the other outer peripheral surface, and a circumferential groove 30 is formed in the vicinity of the end. The plate-like body 2 is the same as that in the first embodiment. The columnar body 3 is set at a position where the upper end surface is flush with the plate-like body 2 and the circumferential groove 30 and the thick portion 21 face each other by a caulking jig 4 similar to that of the first embodiment.

  Then, by pressing the pressure punch 43 from above, the thick portion 21 is directly compressed and pressed with the lower support 41 by the punch, and as in the first embodiment, as shown in FIG. As shown in FIG. 2, the plastically deformed thick portion 21 fills the gap S in the circumferential groove 30, and the crimped assembly 1 in which the plate-like body 2 and the columnar body 3 are firmly integrated is obtained.

  In this example, the columnar body 3 is also compressed at the same time, but like the plate-like body 2, the lower end of the columnar body is supported by a spring bias so that it can be moved downward together with the pressure punch 43 so as not to be compressed. It is also a preferable example to configure. Further, as in the third embodiment to be described later, compression pressing is performed via a spacer member whose lower end abuts on the thick portion 21, or a cylindrical portion that abuts only on the thick portion is integrated with the lower end of the pressure punch 43. Alternatively, it may be formed. The materials, structures, and other modifications of the columnar body 3 and the plate-like body 2 can be applied as in the first embodiment.

  Next, the manufacturing method of 3rd Embodiment is demonstrated based on FIG.

  In the first and second embodiments described above, the example in which the plate-like body 2 is assembled to the end portion of the columnar body 3 has been described. However, in this embodiment, the plate-like body 2 is not disposed at the end portion of the columnar body 3. An example of assembly will be described.

  As shown in FIG. 7A, a circumferential groove 30 is formed in the middle of the columnar body 3 in the axial direction, and the plate-like body 2 assembled to this is the same as in the first embodiment. The columnar body 3 is set at a position where the circumferential groove 30 and the thick portion 21 face each other by the caulking jig 4 similar to that of the first embodiment, and above the circumferential groove 30 and above the plate-like body 2. A spacer member 5 having a cylindrical portion with which the lower end portion 50 abuts against the upper end surface of the thick portion 21 is separately attached to the protruding portion.

  Then, by pressing the spacer member 5 from above with the pressure punch 43, the thick portion 21 is compressed and pressed with the lower support 41 via the spacer member 5, thereby the first embodiment. 7B, the thickened portion 21 plastically deformed fills the gap S in the circumferential groove 30, and the crimped assembly 1 in which the plate-like body 2 and the columnar body 3 are firmly integrated is obtained. can get.

  Here, although the spacer member 5 is configured in a bottomed shape opened to the lower side, the spacer member 5 may be configured to have a cylindrical shape opened also on the upper side. Further, although the columnar body 3 is also compressed together from the middle by the spacer member 5, even if the gap between the spacer member 5 and the upper end surface of the columnar body 3 is sufficiently large, no compression force acts on the columnar body 3. Good.

Further, like the plate-like body 2, it is also a preferable example that the lower end of the columnar body is supported by a spring bias so as to be movable together with the spacer member 5 so as not to be compressed.
In this example, the spacer member 5 is separately interposed between the pressure punch 43 and the thick portion 21, but a cylindrical portion similar to the spacer member 5 is integrally formed at the lower end portion of the pressure punch 43. Those are also preferred. The materials, structures, and other modifications of the columnar body 3 and the plate-like body 2 can be applied as in the first embodiment.

  Next, the manufacturing method of 4th Embodiment is demonstrated based on FIG.

In the present embodiment, as shown in FIG. 9, an uneven groove (in this example, a knurled groove 32 by knurling) is formed in the circumferential groove 30 formed on the outer peripheral surface of the columnar body 3 by uneven processing. However, when the thick portion 21 of the plate-like body 2 bites into the gap S in the circumferential groove 30 and is fixed, the assembling strength is further increased by biting into the concave and convex grooves. The part for forming the concave and convex grooves in the circumferential groove 30 may be formed on the bottom as in this example, or may be formed on the inner wall of the circumferential groove. Moreover, you may form in both. Furthermore, it is not necessary to form the entire surface of the bottom or inner wall, and it can be formed in a partial region along the axial direction (groove width direction) of the circumferential groove bottom, or in the radial direction of the inner wall (groove depth). (Direction) may be formed in a part of the region. This uneven groove can further increase the rotational strength by providing a plurality of grooves extending in the direction intersecting the circumferential direction, particularly a plurality of grooves extending in the axial direction at intervals.
The concavo-convex process for forming these concavo-convex grooves is preferably performed by knurling as in this example, but it is of course possible to form by other concavo-convex processes. It is also preferable to form the concavo-convex grooves in an oblique direction (spiral shape) or a stitch shape in addition to those along the axial direction as in this example. The materials and structures of the columnar body 3 and the plate-like body 2, the processing method, and other modifications can be applied in the same manner as in the first to third embodiments.

  Next, the result of the strength test performed on each crimped assembly of Examples 1 to 6 assembled by the manufacturing method of the present invention will be described.

  In Examples 1 to 6, a plate-like body of an aluminum alloy is assembled by crimping to the end of an aluminum alloy columnar body (shaft body) by the method of the first embodiment, and the outer diameter of the shaft body The thickness of the plate-like body is as shown in Table 1.

  About these Examples 1-6, indentation intensity | strength, collapse strength, and rotational strength (only Examples 3-6) were tested, respectively. As shown in FIG. 10A, the indentation strength is such that the plate-like body 2 is placed on the base 6 provided with the relief hole 60, and the shaft body 3 erected upward is directly above the relief hole. The plate-like body is fixed to the base 6. Then, a vertical load is applied downward by placing a block on the upper end of the shaft body, and the presence or absence of the shaft body is checked.

  As shown in FIG. 10B, the collapse strength is fixed by a predetermined distance H along the protruding direction of the shaft body 3 extending in the lateral direction, with the plate-like body 2 fixed to the support plate 62 extending upward from the base 61. At each position, a vertical load is applied downward to see if the shaft has fallen. The distance H was 7 mm in Examples 1 to 4, and 40 mm in Examples 5 and 6.

  As shown in FIG. 10 (c), the rotational strength is determined by fixing the plate-like body 2 to the support plate 62 in the same manner as the collapse strength, and applying a rotational torque to the shaft body to determine whether the shaft body is relatively rotated. See. The rotational strength was only for Examples 3-6.

  As a result of each test, as shown in Tables 2 to 4, the standard strength could be cleared in all tests.

  Next, the caulking assembly (3 samples) of Example 7 assembled by the manufacturing method of the second embodiment and Example 8 of assembly by the manufacturing method (with knurled grooves) of the fourth embodiment. The results of performing a strength test on each of the crimped assemblies (three samples) will be described.

  In each of Examples 7 and 8, a plate-like body of an electrogalvanized steel plate (SECC) is assembled to the end of an iron columnar body (round bar) by caulking, and the outer diameter of the shaft body is 7. The plate thickness is 0 mm, and the plate thickness is 0.8 mm. For Examples 7 and 8, the indentation strength, collapse strength, and rotational strength were tested under the same conditions by the method shown in FIGS. 10A to 10C, and the perpendicularity was measured with a three-dimensional measuring instrument. As a result, as shown in Table 5, it can be seen that the rotational strength is remarkably improved by performing knurling as in the fourth embodiment. In addition, both the indentation strength and the rotational strength clear the standard strength (indentation strength of 245 N or higher, rotational strength of 0.98 Nm or higher).

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

The perspective view which shows each member of the crimping assembly | attachment which concerns on 1st Embodiment of this invention. Sectional drawing which shows the state which similarly attached each member in the crimping jig in 1st Embodiment. Sectional drawing which shows the process in which a thick part plastically deforms and bites into the circumferential groove of a columnar body. Sectional drawing which shows the state which the crimping process was completed. The perspective view which shows the caulking assembly | attachment of 1st Embodiment. (A) And (b) is sectional drawing which shows the manufacturing method of 2nd Embodiment. (A) And (b) is sectional drawing which shows the manufacturing method of 3rd Embodiment. Explanatory drawing which shows the modification of each member of a crimping assembly | attachment. (A)-(c) is sectional drawing which shows the manufacturing method of 4th Embodiment. (A)-(c) is explanatory drawing which shows the test method of indentation intensity | strength, collapse strength, and rotational strength, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Caulking assembly 2 Plate-like body 3 Columnar body 4 Caulking jig 5 Spacer member 6 Base 20 Mounting hole 21 Thick part 30 Circumferential groove 31 Flange part 32 Knurled groove 40 Insertion hole 41 Supporting tool 42 Outer shape holding tool 43 Addition Pressure punch 50 Lower end 60 Hole 61 Base 62 Support plate H Distance S Gap

Claims (8)

A method for producing a crimped assembly of a metal plate-like body and a hollow or solid columnar body,
Providing a metal plate-like body with an attachment hole for inserting and assembling the shaft body, and forming a thick portion along the inner periphery of the attachment hole;
Forming a circumferential groove of a predetermined depth at the assembly position of the columnar body outer circumferential surface inserted into the mounting hole;
Inserting the columnar body into the mounting hole of the metal plate-like body, and setting the assembly position where the thick wall portion and the circumferential groove face each other;
A caulking step for biting into the circumferential grooves of the opposing columnar body by compressively pressing the thick part from the axial direction and plastically deforming toward the center of the mounting hole,
The manufacturing method of the crimping | attachment assembly | attachment characterized by comprising.   The method for manufacturing a crimped assembly according to claim 1, wherein the thickened portion of the mounting hole is formed by burring.   A support having an insertion hole for slidingly guiding the columnar body, and supporting and supporting the thick portion of the metal plate body set on the columnar body from one side in the axial direction, and the thick portion as the shaft The manufacturing method of the crimping | attachment assembly | attachment of Claim 1 or 2 formed by compression-pressing the said thick part by the press punch punched directly or indirectly from the other direction side.   The manufacturing of the crimped assembly according to any one of claims 1 to 3, wherein a plurality of concave and convex grooves extending in a direction intersecting the circumferential direction are formed over the entire circumference in the peripheral groove of the columnar body. Method. An apparatus for manufacturing a caulking assembly of a metal plate-like body and a hollow or solid columnar body,
A means for forming a thick portion along the inner peripheral edge of the mounting hole while providing a mounting hole for inserting and assembling the columnar body in the metal plate-like body,
Means for forming a circumferential groove with a predetermined depth at the assembly position of the outer peripheral surface of the columnar body inserted into the mounting hole;
Means for inserting the columnar body into the mounting hole of the metal plate-like body, and setting the assembled portion at which the thick portion and the circumferential groove face each other;
A caulking means for biting into the circumferential groove of the opposing columnar body by compressing and pressing the thick part from the axial direction and plastically deforming in the center direction of the mounting hole;
A caulking assembly manufacturing apparatus characterized by comprising:   The apparatus for manufacturing a crimped assembly according to claim 5, wherein the thick portion of the mounting hole is formed by burring.   A support having an insertion hole for slidingly guiding the columnar body, and abutting and supporting the thick-walled portion of the metal plate-shaped body set on the columnar body from one side in the axial direction, and the thick-walled portion as a shaft The manufacturing apparatus of the crimping | attachment assembly | attachment of Claim 5 or 6 formed by compression-pressing the said thick part by the pressure punch pressed directly or indirectly from the other direction side.   A caulking assembly consisting of a metal plate and a hollow or solid columnar body, provided with a mounting hole for inserting and assembling the columnar body into the metal plate, A thick wall is formed along the inner periphery, a circumferential groove having a predetermined depth is formed at the assembly position of the outer circumferential surface of the columnar body inserted into the mounting hole, and the columnar body is attached to the metal plate-like body. Opposite columnar shape by inserting into the hole and plastically deforming the thick part in the direction of the center of the mounting hole by compressing the thick part in the axial direction with the thick part and the circumferential groove set in an opposing mounting position A caulking assembly, characterized in that it is fixed by biting into the circumferential groove of the body.

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