Pressing tool and press machine

Abstract

The application relates to a crimping tool and a press-fitting machine. The crimping tool comprises a machine body and a pressing column. The machine body comprises a first seat body and a positioning piece. The first seat body is provided with a press-fitting cavity and a positioning groove. The positioning groove is communicated with the press-fitting cavity. The positioning piece is arranged in the positioning groove and is spaced apart from the positioning wall of the positioning groove. The positioning piece is used for sleeving a shell. The positioning wall is used for abutting against a flat position outside the shell. The pressing column is movably arranged in the side cavity wall of the press-fitting cavity which is away from the positioning groove and extends into the press-fitting cavity. The pressing column is provided with a limiting part which is used for circumferentially positioning and cooperating with an insulator. The positioning piece is used for sleeving the shell, that is, the positioning piece supports and positions the shell from inside to outside. The positioning wall is used for abutting against the flat position outside the shell, that is, the positioning wall supports the shell from outside to inside. Therefore, the position stability of the shell can be improved by the double inside and outside supports of the positioning piece and the positioning wall, the risk of the shell deflection in the press-fitting process is reduced, and the plug-in effect is improved. The press-fitting machine comprises the above crimping tool.

Description

Technical Field

[0001] This application relates to the field of electrical connector assembly technology, and in particular to a crimping fixture and crimping machine. Background Technology

[0002] Electrical connectors, as a crucial circuit connection component, are widely used in electronic equipment, aerospace, and defense industries. They typically consist of three basic units: a housing, an insulator, and conductive terminals. The insulator is primarily responsible for securing the conductive terminals, such as pins and sockets, and ensuring electrical insulation between the conductive terminals and between the terminals and the housing.

[0003] In the assembly of electrical connectors, insulators are typically configured with raised keys, which engage with corresponding grooves on the inner wall of the housing to achieve circumferential positioning. This raised key positioning structure results in the area where the raised key is located experiencing greater assembly stress compared to other areas of the insulator during insertion. Due to the uneven distribution of forces, the insulator and housing are prone to relative misalignment when inserted into the housing, which not only increases the difficulty of assembly but also makes the housing more susceptible to deformation or even damage due to localized stress concentration. Utility Model Content

[0004] Therefore, it is necessary to provide a crimping fixture and crimping machine to address the problem of relative misalignment between the insulator and the housing during the insertion process of electrical connectors.

[0005] This application provides a crimping fixture for pressing an insulator of an electrical connector into a housing. The crimping fixture includes a body and a crimping post. The body includes a first base and a positioning member. The first base has a crimping cavity and a positioning groove. The positioning groove communicates with the crimping cavity. The positioning member passes through the positioning groove and is spaced apart from the positioning wall of the positioning groove. The positioning member is fitted onto the housing. The positioning wall is used to abut against a flat part on the outside of the housing. The crimping post is movably inserted through the cavity wall of the crimping cavity away from the positioning groove and extends into the crimping cavity. The crimping post has a limiting part for circumferential positioning engagement with the insulator.

[0006] In one embodiment, the two positioning walls are arranged facing each other and are spaced apart from the positioning member, and at least one of the two positioning walls is used to abut against the housing.

[0007] In one embodiment, the positioning member is hollow, and the crimping tool further includes a spring that passes through the positioning member. The spring is used to abut against the housing and / or the insulator and is compressed during the pressing of the pressure column.

[0008] In one embodiment, the positioning member has a positioning hole, the wall of which has an axially extending travel hole. The crimping fixture further includes a support member for abutting the housing and / or the insulator. The support member and the spring are both disposed in the positioning hole. The two ends of the spring abut against the support member and the bottom wall of the positioning hole, respectively. The support member slides with the travel hole, and the opposite side walls of the travel hole in the axial direction of the positioning hole limit the travel of the support member.

[0009] In one embodiment, the positioning groove and the pressing cavity are connected to the external environment from the same side of the machine body.

[0010] In one embodiment, a through hole is provided in the cavity wall of the pressing cavity on the side away from the pressing column. The machine body also includes a second seat body, which is separately disposed from the first seat body. The positioning member is disposed on the top of the second seat body. The second seat body is connected to the first seat body. The through hole is closed on one side by the top of the second seat body to form the positioning groove, and the positioning member passes through the positioning groove.

[0011] In one embodiment, the bottom wall of the positioning groove is recessed to provide a receiving annular groove, the receiving annular groove being for the housing to pass through, and the peripheral wall of the receiving annular groove being used to support the housing.

[0012] In one embodiment, the limiting portion is located at one end of the pressure post near the positioning member, and the limiting portion is configured as a cross groove for arranging the grid of the insulator, the cross groove extending along the axial direction of the pressure post.

[0013] In one embodiment, the first seat has a perforation, the cross-section of which is adapted to the cross-sectional shape of a portion of the pressure column, and both are constructed as polygons.

[0014] This application also provides a pressing machine, which includes the pressing fixtures described above.

[0015] In the aforementioned crimping fixture, the pressure post is used to drive the insulator into the housing. The positioning element passes through the positioning groove and is spaced apart from the positioning wall of the positioning groove, with the space between them allowing for the placement of the housing. The positioning element is fitted onto the housing, meaning it supports and positions the housing from the inside out; the positioning wall abuts against the flat portion of the housing from the outside in. Thus, the dual support from the positioning element and the positioning wall improves the positional stability of the housing, reduces the risk of housing misalignment during crimping, and enhances the insertion effect.

[0016] Furthermore, the positioning wall and the flat part of the outer shell engage in a mating fit. Therefore, the positioning wall can also serve as a positioning reference in the circumferential direction of the shell, ensuring that the shell has the expected circumferential position when placed on the machine body, reducing the impact of circumferential misalignment on accurate insertion. Simultaneously, the pressure post has a limiting part, which is used to position the insulator in the circumferential direction, ensuring that the insulator also has the expected circumferential position. Thus, the limiting part reduces the impact of circumferential misalignment of the insulator on accurate insertion. It is understood that when the insulator and shell are misaligned in the circumferential direction, the protruding key of the insulator and the inner groove of the shell cannot be accurately aligned. During insertion, significant local stress concentration will occur at the protruding key, leading to relative misalignment. This application configures the positioning wall and limiting part to circumferentially position the shell and insulator respectively, improving the circumferential positional stability of both and reducing the probability of misalignment, thereby improving the insertion effect. Attached Figure Description

[0017] Figure 1 This is an isometric schematic diagram of a crimping fixture provided in an embodiment of this application.

[0018] Figure 2 for Figure 1 The front view of the crimping fixture shown.

[0019] Figure 3 for Figure 2 The shown is a cross-sectional view of the crimping fixture along line AA.

[0020] Figure 4 for Figure 1 A isometric view of the second seat of the crimping fixture shown.

[0021] Figure 5 for Figure 4 The top view of the second seat shown.

[0022] Figure 6 for Figure 5 The second body shown is a cross-sectional view along line BB.

[0023] Figure 7 for Figure 2 The shown is a cross-sectional view of the crimping fixture along line CC.

[0024] Figure 8 for Figure 1 The diagram shows an isometric view of the pressure column in the crimping fixture.

[0025] Reference numerals: 10, crimping fixture; 100, machine body; 101, positioning groove; 102, positioning wall; 110, first seat; 111, pressing cavity; 112, through hole; 113, perforation; 120, second seat; 121, accommodating annular groove; 130, positioning element; 131, positioning hole; 132, stroke hole; 200, pressure column; 201, limiting part; 210, adapter section; 220, installation section. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] One embodiment of this application provides a press-fitting machine for pressing the insulator of an electrical connector into a housing to achieve assembly. The press-fitting machine includes a crimping fixture, into which the insulator and the housing can be installed. The crimping fixture can position the two components and is used to press the insulator of the electrical connector into the housing, so that the two components are mated together.

[0033] In one embodiment, the press-fitting machine includes a drive unit connected to a pressing fixture to drive the pressing work to perform a pressing action. In this case, the press-fitting machine can automatically perform the pressing action.

[0034] In another embodiment, the press-fitting machine further includes a transmission mechanism, which, by operating the transmission mechanism, enables the pressing fixture to perform the pressing action. In this case, the press-fitting machine can complete the pressing action under manual operation.

[0035] It should be noted that the embodiments of this application do not limit whether the pressing machine performs the pressing action manually or automatically, and can be designed arbitrarily according to actual needs.

[0036] See Figures 1 to 3 , Figure 1 This paper shows an isometric schematic diagram of a crimping fixture provided in one embodiment of the present application. Figure 2 for Figure 1 The front view of the crimping fixture shown is shown. Figure 3 for Figure 2The image shows a cross-sectional view of the crimping fixture along line AA. One embodiment of this application provides a crimping fixture 10 including a body 100 and a pressing post 200. The pressing post 200 is movably disposed on the body 100 to drive relative movement between the insulator and the housing, completing the crimping action. Further, a flat portion is provided on the outside of the housing, and the body 100 can position the housing by acting on the flat portion.

[0037] The body 100 includes a first base 110 and a positioning member 130. The first base 110 has a pressing cavity 111 and a positioning groove 101. The positioning groove 101 communicates with the pressing cavity 111. The positioning member 130 passes through the positioning groove 101 and is spaced apart from the positioning wall 102 of the positioning groove 101. The positioning member 130 is fitted onto the housing, and the positioning wall 102 is used to abut against the flat part of the housing. A pressure post 200 is movably inserted through the side wall of the pressing cavity 111 away from the positioning groove 101 and extends into the pressing cavity 111. The pressure post 200 has a limiting part 201, which is used for circumferential positioning engagement with the insulator.

[0038] In the aforementioned crimping fixture 10, the pressure post 200 is used to drive the insulator into the housing. The positioning member 130 passes through the positioning groove 101 and is spaced apart from the positioning wall 102 of the positioning groove 101, with the space between them allowing for housing placement. The positioning member 130 is fitted onto the housing, meaning it supports and positions the housing from the inside out; the positioning wall 102 is used to abut against the flat portion of the housing from the outside in, meaning it supports the housing from the outside in. Thus, the dual support from the positioning member 130 and the positioning wall 102 improves the positional stability of the housing, reduces the risk of housing misalignment during crimping, and improves the insertion effect.

[0039] Furthermore, the positioning wall 102 engages with the flat portion of the outer casing, thus serving as a positioning reference in the circumferential direction of the casing. This ensures the casing is positioned correctly in the intended circumferential direction when placed on the body 100, reducing the impact of circumferential misalignment on accurate insertion. Simultaneously, the pressure post 200 has a limiting portion 201, which positions the insulator in the circumferential direction, ensuring it also has the intended circumferential position. Therefore, the limiting portion 201 further reduces the impact of circumferential misalignment of the insulator on accurate insertion.

[0040] Understandably, when the insulator and the housing are not aligned in the circumferential direction, the protruding key of the insulator and the groove inside the housing cannot be accurately aligned. During insertion, significant local stress concentration will occur at the protruding key, leading to relative misalignment between the two. This application configures the positioning wall 102 and the limiting part 201 to perform circumferential positioning of the housing and the insulator, respectively, which can improve the circumferential positional stability of the two, reduce the probability of misalignment, and improve the insertion effect.

[0041] Because the positioning element 130 mates with the housing insert, it can position the housing in a direction perpendicular to its axis. Furthermore, since the housing is placed on the body 100, it also has a defined position axially relative to the positioning element 130. Combined with the circumferential positioning effect of the positioning wall 102, the housing can be fully positioned. (See also...) Figure 2 and Figure 3 Alternatively, two positioning walls 102 can be configured to face each other and be spaced apart from the positioning member 130, with at least one of the two positioning walls 102 used to abut against the housing. When both positioning walls 102 face each other and abut against the housing, the support of the positioning walls 102 for the housing is significantly improved, which can enhance the ability of the insulator and the housing to resist possible eccentric forces during the insertion process, thereby further improving the relative positional stability of the insulator and the housing.

[0042] Furthermore, the number of positioning walls 102 can be three, with two of the three positioning walls 102 facing each other and the third positioning wall 102 connected between the two, forming a semi-enclosed shape around the outer periphery of the positioning member 130, which facilitates circumferential positioning of the housing fitted on the positioning member 130.

[0043] Please see Figure 3 Combined Figure 1 and Figure 2 In one embodiment, the positioning groove 101 and the pressing cavity 111 are connected to the external environment from the same side of the body 100. Therefore, the housing and insulator can be installed into the body 100 from the same side, and it can be observed from that side whether the housing and insulator are properly installed.

[0044] Please see Figure 4 Combined Figure 1 and Figure 2In one embodiment, a through hole 112 is formed in the cavity wall of the pressing cavity 111. The through hole 112 is located on the side of the cavity wall of the pressing cavity 111 away from the side through which the pressing column 200 passes. The machine body 100 also includes a second seat 120, which is separately disposed from the first seat 110. A positioning member 130 is disposed on the top of the second seat 120. The second seat 120 is connected to the first seat 110. The through hole 112 is closed on one side by the top of the second seat 120 to form a positioning groove 101, through which the positioning member 130 passes. Compared with the positioning groove 101 and the positioning member 130 located in the positioning groove 101 being machined in the integrally formed first seat 110, in this embodiment the second seat 120 and the first seat 110 are separately disposed. Therefore, it is convenient to machine the protruding positioning member 130 on the top of the second seat 120 and to machine the through hole 112 on the bottom of the first seat 110. Based on this, a second base 120 is configured to be connected to the bottom of the first base 110, thereby forming a positioning groove 101, and the positioning element 130 is inserted into the positioning groove 101, which is convenient for processing and manufacturing.

[0045] As one example, the second seat 120 can be fixedly connected to the first seat 110 with the locking of the threaded connection.

[0046] Please see Figure 2 and Figure 3 In one embodiment, the bottom wall of the positioning groove 101 (i.e. the top of the second seat 120) can be used to support the housing.

[0047] In one embodiment, the bottom wall of the positioning groove 101 is recessed to provide a receiving annular groove 121, through which the housing passes, and the peripheral wall of the receiving annular groove 121 is used to support the housing. In this case, the bottom wall of the receiving annular groove 121 can be configured to support the housing, and the peripheral wall of the receiving annular groove 121 can support the housing from the outside in, further improving the positional stability of the housing.

[0048] It is understood that the housing can be placed either on the bottom wall of the positioning groove 101 or in the receiving annular groove 121, depending on the shape of the housing. In other words, this embodiment provides two installation methods for the housing, both of which can stably support the housing.

[0049] Please see Figure 4 Combined Figure 6In one embodiment, the positioning member 130 is hollow, forming a positioning hole 131. The crimping fixture 10 also includes a spring (not shown, the same below), which passes through the positioning member 130. The spring is used to hold the housing and / or insulator, and is compressed during the pressing of the pressure column 200. Thus, when the insulator and housing are inserted and the pressure column 200 is released, the assembled housing and insulator can be ejected under the action of the spring to achieve automatic unloading and improve assembly efficiency.

[0050] As one example, the spring can be configured as a compression spring.

[0051] Please see Figure 6 In one embodiment, the positioning member 130 has a positioning hole 131, and the wall of the positioning hole 131 has an axially extending travel hole 132. The crimping fixture 10 also includes a retaining member (not shown in the figure, the same below), which is used to hold the housing and / or insulator. The retaining member and the spring are both disposed in the positioning hole 131, and the two ends of the spring abut against the retaining member and the bottom wall of the positioning hole 131, respectively. That is, the spring applies an elastic holding force to the housing and / or insulator through the retaining member, so that the elastic force can be uniformly applied to the housing and / or insulator. It can be understood that the spring has a helical structure and a relatively small contact area. In this embodiment, the retaining member is configured to replace the spring to apply an elastic holding force to the housing and / or insulator, which can improve the uniformity of force transmission.

[0052] Understandably, during the press-fitting process, the housing and / or insulator abut against the spring through the retaining element, causing the spring to compress and accumulate elastic potential energy.

[0053] In one embodiment, the abutment member slides into the travel hole 132, and the opposing side walls of the travel hole 132 in the axial direction of the positioning hole 131 define the travel of the abutment member. This arrangement ensures that the abutment member always moves within the expected travel range, and the spring expands and contracts within a relatively enclosed space, improving the positional stability of both.

[0054] Furthermore, the positioning hole 131 can extend into the second seat 120, so that there is sufficient space in the positioning hole 131 for the spring to be arranged, so that the spring can freely and elastically extend and retract.

[0055] In one embodiment, the cross-sectional shape of the abutment can be adapted to the cross-sectional shape of the positioning hole 131 to slide against the hole wall of the positioning hole 131, thereby stably transmitting elastic force.

[0056] In one embodiment, the abutment has a pin (not shown in the figure, the same below), which passes through the stroke hole 132 to abut against the opposing end walls of the stroke hole 132, thereby limiting the movement stroke of the abutment.

[0057] Furthermore, the number of pins and the number of travel holes 132 are at least two, with at least two pins corresponding to each other in at least two travel holes 132, in order to improve the stability of the fit.

[0058] Please see Figure 7 and Figure 8 Combined Figure 1 In one embodiment, a limiting portion 201 is provided at one end of the pressure post 200 near the positioning member 130. The limiting portion 201 is configured as a cross groove for arranging the grid of the insulator. The insulator is fitted onto the end of the pressure post 200 near the positioning member 130, and its grid is embedded in the cross groove. The cross groove restricts circumferential rotation of the insulator by abutting against the grid and allows axial movement of the insulator so that the insulator can be disengaged from the pressure post 200 after insertion.

[0059] Understandably, insulators typically have multiple holes for arranging conductive terminals, and the grid is used to divide these holes. In other words, the limiting part 201 can utilize the existing structure of the insulator to limit its movement.

[0060] Furthermore, the cross groove extends along the axial direction of the pressure post 200, so the groove wall of the cross groove can also support the insulator and reduce the risk of its skewing.

[0061] In another embodiment, when the insulator does not have a grid, the insulator can also be circumferentially limited by other existing structures of the insulator. As one example, when the insulator has a strip groove or an inner convex rib, the limiting part 201 can be configured as an outer convex rib that inserts and cooperates with the strip groove, or the limiting part 201 can be configured as an inner strip groove that inserts and cooperates with the inner convex rib, so as to achieve the purpose of circumferentially limiting the insulator.

[0062] Please see Figure 7 and Figure 8 In one embodiment, the first seat 110 has a through hole 113, the cross-section of which is adapted to the cross-sectional shape of a portion of the pressure post 200, and both are constructed as polygons. When the pressure post 200 with a polygonal cross-section passes through the polygonal through hole 113, the wall of the through hole 113 can restrict the circumferential movement of the pressure post 200, thereby reducing the risk of circumferential misalignment caused by rotation of the pressure post 200 and the insulator on it during the pressing process.

[0063] In one embodiment, the cross-section of the perforation 113 and the cross-section of a portion of the pressure column 200 can be configured as a triangle, rectangle, pentagon, etc.

[0064] Please see Figure 8In one embodiment, the pressure post 200 includes an adapter section 210 and a mounting section 220. The adapter section 210 is inserted into the through hole 113, meaning that the cross-sectional shape of the adapter section 210 is adapted to the cross-sectional shape of the through hole 113. The mounting section 220 provides an insulator assembly, meaning that a limiting portion 201 is formed in the mounting section 220.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A crimping tool, characterized in that, The crimping fixture is used to press the insulator of the electrical connector into the housing, and the crimping fixture includes: The body includes a first base and a positioning member. The first base has a pressing cavity and a positioning groove. The positioning groove communicates with the pressing cavity. The positioning member passes through the positioning groove and is spaced apart from the positioning wall of the positioning groove. The positioning member is fitted onto the housing. The positioning wall is used to abut against the flat part outside the housing. A pressure post is movably inserted through the side wall of the pressing cavity away from the positioning groove and extends into the pressing cavity. The pressure post has a limiting part for circumferential positioning engagement with the insulator.

2. The crimping fixture according to claim 1, characterized in that, The two positioning walls are arranged facing each other and are spaced apart from the positioning member, and at least one of the two positioning walls is used to abut against the housing.

3. The crimping fixture according to claim 1, characterized in that, The positioning component is hollow, and the crimping tooling also includes a spring, which passes through the positioning component. The spring is used to support the housing and / or the insulator, and is compressed during the pressing process of the pressure column.

4. The crimping fixture according to claim 3, characterized in that, The positioning member has a positioning hole, and the wall of the positioning hole has a stroke hole extending axially. The crimping fixture also includes a support member for supporting the housing and / or the insulator. The support member and the spring are both disposed in the positioning hole. The two ends of the spring support the support member and the bottom wall of the positioning hole, respectively. The support member slides with the stroke hole. The opposing side walls of the stroke hole on the axial direction of the positioning hole are used to limit the stroke of the support member.

5. The crimping fixture according to claim 1, characterized in that, The positioning groove and the pressing cavity are connected to the external environment from the same side of the machine body.

6. The crimping fixture according to claim 1, characterized in that, The cavity wall of the pressing cavity has a through hole on the side away from the pressing column. The machine body also includes a second seat body, which is separately disposed from the first seat body. The positioning member is disposed on the top of the second seat body. The second seat body is connected to the first seat body. The through hole is closed on one side by the top of the second seat body to form the positioning groove, and the positioning member passes through the positioning groove.

7. The crimping fixture according to claim 1, characterized in that, The bottom wall of the positioning groove is recessed and provided with a receiving annular groove, through which the housing passes, and the peripheral wall of the receiving annular groove is used to support the housing.

8. The crimping fixture according to claim 1, characterized in that, The limiting part is located at one end of the pressure column near the positioning member. The limiting part is constructed as a cross groove, which is used for the grid arrangement of the insulator. The cross groove extends along the axial direction of the pressure column.

9. The crimping fixture according to claim 1, characterized in that, The first seat has a perforation, the cross-section of which is adapted to the cross-sectional shape of a portion of the pressure column, and the two are constructed as polygons.

10. A press-fitting machine, characterized in that, The pressing machine includes the pressing fixture as described in any one of claims 1 to 9.

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