JP2004264016A - Metal fixing material bush, and manufacturing method for core material thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a metal fixing bush having high strength and suitability against a great stress, and capable of avoiding an assembling error caused by inaccurate conformity among individual different elements, at a low labor cost, using an inexpensive material. <P>SOLUTION: This metal fixing bush is a metal fixing bush such as a bush for, in particular, glass-metal, an igniter of an airbag or a belt tension pulley. The bush is provided with at least one metal pin arranged inside a slot in an inside of the core material via a fixing material, the core material has a front part and a rear part, the core material is formed of one element, and a shape of the core material partitioning the slot is formed by at least one of another working. A means for preventing the fixing material from moving relatively toward a direction of the rear part opposed to an inner circumference of the slot is provided between the front part and the rear part of the core material. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention particularly relates to a metal fixing material bush having the features of the inclusion portion of claim 1, and more particularly to a method of manufacturing a core material of the metal fixing material bush having the features of the inclusion portion of claim 23.

  Various designs for metal anchor bushes are known in the art. With a metal fixing bushing, a vacuum hermetic seal made of a fixing material, in particular a glass to metal vacuum hermetic seal, is understood. Metal acts as an electrical conductor. See, typically, US Pat. Such bushes are common in electronic and electrical engineering. Glass used for sealing or sealing serves as an insulator. A typical metal anchor bushing is built up in such a way that a metallic inner conductor is encapsulated in a preformed sintered glass part, whereby the sintered glass part or glass tube in the outer metal part is so-called. Sealed with core material. For example, an igniter is a preferred application for such a metal anchor bush. This igniter is used, inter alia, for airbags or belt extension pulleys in motor vehicles and the like. In this case, the metal fixing bush is a component of the ignition device. In addition to the metal anchor bushing, the entire igniter is provided with explosives with a spark plug and a metal cover that tightly encloses the ignition mechanism. One, two, or three or more metal pins can be passed through the bush. In the preferred embodiment with one metal pin, the caging is grounded, and in the preferred two-pole embodiment, one of the pins is grounded. The ignition device described above is used in particular for airbags or belt extension pulleys in motor vehicles. Known devices of the type mentioned or of a similar type are described in US Pat. Nos. 3,4,5,5 or 6, the disclosures of which are fully incorporated herein. The previously mentioned ignition unit has two metal pins. However, the electronic igniter can also have only a single pin. The igniter shown in the state of the art comprises a metal core, for example a metal sleeve, which is configured as a turning part. The metal core represents at least one slot through which at least one metal pin is passed. One significant problem with this design lies in the fact that such designs are material and cost intensive.

U.S. Pat. No. 5,345,872 U.S. Pat. No. 3,274,937 US Patent No. 6,274,252 US Patent No. 5,621,183 German Patent Publication No. 29 04 174 A1 German Patent Publication No. 199 27 233 A1

  The invention is therefore characterized by a high strength with low material and labor expenditures, a greater resistance to stress, and furthermore, based on the object of creating a metal anchor bushing of the type mentioned at the outset, and The aim is to avoid assembly errors resulting from incorrect matching of the individual elements.

  The solution of the invention is characterized by the features of claim 1. A methodical embodiment for the production of a core material is defined in claim 34. Useful developments are reproduced in the dependent claims.

  The metal anchor bushing comprises a metal core through which at least one metal pin is passed. If two metal pins are provided in the preferred embodiment, one of the two metal pins at least directly or indirectly establishes a ground connection with the core through additional elements. . In an embodiment with two metal pins, the metal pins are preferably arranged parallel to one another. At least one of the metal pins is located in a slot in the core and secured against the core by a fastener, preferably in the form of a glass plug. According to the invention, the core is formed by a sheet metal element, whereby in a first embodiment at least the slots are produced by a separate machining, in particular by punching. The core material itself is preferably obtained by punching (punching) a solid material, but the final shape of the core material is held by a forming process such as a deep drawing method. In a preferred embodiment, the final shape defining the outer contour and the basic shape defining the slot are produced by at least one further machining, in particular by punching. What the final shape means is that no further shaping has to be performed on it. What the basic shape means is either that it represents the final shape in the absence of any further essential changes, or that the changes can still be undertaken to that basic shape by further manufacturing methods, in particular molding methods. So that the final shape is not achieved until after these additional methods. Means are provided between the front and rear to avoid relative movement of the anchor in the direction of the rear facing the inner circumference of the slot. These means are either integral components of the core or form a component together with the core.

  What is meant by the production of the shape by another process is that the final shape for the outer periphery of the core is created by blanking and the shape of the slot is created by punching. Means for avoiding relative movement of the anchoring material in the direction of the rear facing the inner periphery of the slot may be used to control difficulties arising from the sealing of a single metal pin in the slot, as well as for the unit anchoring material. And for the purpose of safety against withdrawal of metal pins. These means act as a type of barb and, upon relative movement in the rearward direction, lead to deterministic locking between the anchor plug, in particular the glass plug and the core. These may include, for example, at least one local contraction in the slot, thereby providing an entire area of the inner circumference except the front of the core.

  The solution according to the invention makes it possible to rely on more cost-effective production methods and starting materials, whereby the raw materials are considerably minimized. In addition, the entire core is designed or designed as an integral component, in which the metal pins are sealed by a fixing material. Another significant advantage is that extrusion of the metal pin with the glass plug out of the port slot is safely prevented, even under increased loads, such as pressure loads, on the single metal pin. The overall design can be made smaller with respect to width, and can be applied to smaller sizes with greater loads through the assurance of the articulation of the metal pins in the core.

  What is critical in the processing is that there is a local shrinkage in the cross-section in the region of the rear or in the region between the rear and the front, so that the front always has a larger Characterized by diameter.

  According to a particularly advantageous design, the second metal pin is grounded or stopped as a ground pin on the rear of the core. As a result, there is no longer any need for additional measures for grounding the metal pin fixed in the core with the fixing material or for electrically coupling it to the core. Furthermore, with the still only one pin to be fixed in the slot, the possibility of securely fixing that single pin completely circumferentially is more variable and the potential connection surface for the ground pin is expanded. Can be done.

  For example, glass plugs, ceramic plugs, glass-ceramic plugs, or high performance polymers can be used as the anchor.

  There are numerous possibilities for the specific development of the means for preventing relative movement between the anchor and the slot, in particular slippage. These are characterized by heartwood measures. In the simplest case, the measures on the core depend on what can be embodied in manufacturing, especially during punching. In processing, the slot between the rear and the front is characterized by a change in cross-sectional profile. In the simplest case, at least two regions of variable inner dimensions are provided as slots with a circular cross section having a variable diameter in the design. In processing, the cross-sectional change can occur in multiple stages or continuously. In the latter case, the slot between the front and the rear is tapered in the design such that the slot narrows toward the rear. The measures on the core are in principle further characterized by the provision of several recesses or projections. They are free of the front from such an undercut by forming at least one undercut located between the rear and the front when viewed from the inner circumference of the slot in the core. In the symmetrical structure of the slot, this is a first sub-region extending from the rear to the front, a second sub-region connected to the first sub-region, and a third sub-region extending from the front to the rear. It is characterized by three sub-regions with sub-regions. The second sub-region is characterized by a smaller or larger slot diameter than the first and second sub-regions. Then, preferably, the first and second sub-regions are characterized by equivalent cross-sectional dimensions.

  In embodiments with three or more regions of variable dimensions, especially variable diameters, the method resulting from machining both sides of the core is selected. If, in the implementation described earlier, an asymmetrical shape of the slot is intended, an embodiment of the slot with more than two regions is preferably chosen, preferably an evolution of the slot, which is optional with respect to the mounting position. Can be used with This is opposite to the theoretical center line running perpendicular to the pin axis of the metal pin in the core, and extends into the central region of the core and is designed symmetrically. Thereby, the front and rear can also be exchanged for their functions. The undercuts formed by these oppose the possible movement of the anchor plug in both directions.

  According to a further design, there may also be a number of protrusions circumferentially arranged spaced apart from one another on a common length between the front and the rear. They are produced in principle by stamping (molding or embossing), ie by molding under pressure in the rear region. The manufacturing process is thus particularly cost-effective.

  Another option to prevent relative movement between the anchor plug and the port is to form a deterministic connection between them. For example, glass is typically placed in an opening with metal pins and the glass and metal ring are heated so that after cooling, the metal heat shrinks onto the glass plug. Generally, the slot essentially represents the final diameter after punching of the slot. Of course, the punched slot itself is machined and polished, for example, without significant change in final diameter. The slots may have a circular cross section. Other possibilities, such as oval, are also conceivable.

  According to an advantageous further development for additionally preventing relative movement under load between the metal pin and the fixing, measures are provided on the metal pin. In this process, this may be a protrusion or recess extending over the entire circumference of the metal pin, or randomly or fixedly pre-defined circumferentially adjacent to one another. With a raised projection.

  The method of manufacturing the core of the metal bush is obtained by a separate machining without machining from a sheet metal part having a predefined thickness at the terminal contour defining the outer shape. The achievement of the basic shape defining the slot configuration for the formation of the slot is made for the at least one metal pin by punching (punching) a sheet metal part. In processing, both operations can be cost-saving, single tools and one processing step. The undercut in the slot is expanded by deformation of the slot, eg, stamping. A single stamping operation can be undertaken before or after the punching operation. Preferably, the stamping and punching operations are performed on the same side of the core to avoid unnecessary work-in-progress, and these steps are performed immediately from one to the other.

  Corresponding to the desired shape to be achieved, the stamping operation is performed on either one or both surfaces, in which case preferably the equivalent stamping parameters are set, Ensure symmetric realization of slots.

  The solution of the present invention is described in detail below using the drawings.

  FIG. 1a illustrates a first embodiment of a metal anchor bush 1 designed, for example, for an airbag igniter using an axial section in accordance with the invention. It comprises a core 3 forming a metal collar 2 in which two parallel metal pins 4 and 5 are electrically coupled. These two metal pins 4 and 5 are arranged parallel to each other. In processing, one acts as a conductor and the second pin is grounded. In this display example, the first metal pin 4 operates as a conductor, and the metal pin 5 operates as a ground pin. At least one of these metal pins, in particular the metal pin 4 operating as a conductor, is passed through the core 3. In the case of the display example, the ground pin 5 is directly connected to the rear portion 12 of the core material 3. The metal pin 4 is sealed for this purpose, for example, on a glass plug 6 cooled from molten glass, with a fixing material 34, part 11 of its length l. The metal pin 4 projects at least on one side on the surface 7 of the glass plug 6 and is sealed flush with the second surface 8 of the glass plug 6 in the embodiment represented. Other modifications are also conceivable. Preferably, not only the slot but also the core 3 is designed as a punched element 9 (punch element). This means that the contour, in particular the shape defining the outer periphery 10, is created by blanking, preferably by punching. The punch can be kept used in its shape after the punching operation, or it can be deformed, for example deep drawn, in a further operation. The slot 11 provided for receiving and securing the metal pin 4 by the glass plug 6 is produced in a preferred embodiment by a punching operation in the form of a slot. Subsequently, the metal pin 4 is inserted into the rear part 12 of the metal fixing material bush 1 together with the glass plug in the slot 11, and the metal plate including the glass plug and the metal pin is heated, and after the cooling operation, the metal plate is cooled. Heat shrinks, thus forming an indeterminate connection between the glass plug 6 with the metal pins 4 and the core 3. It is also conceivable to insert the fixing material in the molten or flowing state, in particular the molten glass in the front part 13 into the slot 11. During cooling, a deterministic and substantial connection built into the material is provided both between the outer circumference 14 of the metal pin 4 and between the inner circumference 15 of the slot 11. In the event of stress (deformation) of the all-metal anchor bush 1 during ignition, in order to prevent the metal pin 4 with the glass plug 6 from loosening from the core 3, between the anchor 34 and the inner circumference 15 of the slot Means for preventing relative movement in the direction of the rear part 12, the means of which is indicated here at 35. These act somewhat as barbs and provide a means for connecting between the core 3 and the glass plug 6 under tension and / or under pressure against the glass plug 6 and / or the metal pin 4. It provides complete locking and prevents slippage associated therewith at the rear 12. For this purpose according to the first embodiment, the slot 11 is designed to have an undercut 36 formed by a projection 37. This projection is provided in the region of the rear portion 12, and in the case of the display example, approaches so as to be flush with the rear portion. In the example shown, the slot 12, which is preferably designed with a circular cross section, is characterized via this projection 37 by two different diameters d1 and d2. The diameter d1 is larger than d2. The diameter d2 is the diameter at the rear portion 12 of the slot 11. The diameter d1 is the diameter at the front portion 13 of the slot 11. As a result, the slot 11 is finished over a fairly large part of its length ld1 with the same diameter d1. Id2 represents the design of slot 11 with diameter d2. That is, the slot has two sub-regions, a first sub-region 16 and a second sub-region 17, wherein the first sub-region 16 is characterized by a diameter d1 and the second sub-region 17 is characterized by a diameter d2. I have. These diameters are, as represented in FIGS. 1b and 1c, the front part 13 or the rear part, with the subsequent deformation operation under the action of pressure on the core 3, in particular stamping (forming or embossing). It is created by a slot-shaped single-sided stamping operation on the 12 sides. Preferably, the punching and deforming operations are each performed from the same side, and typically from the front 13. The blanking of the core material 3 can also be performed within the framework of a punching operation or a cutting operation such as a preceding water jet cutting or laser beam cutting. Preferably, however, this is done by punching. The tool for this is designed such that the whole core material 3 having the slot 11 is punched in one processing step of a sheet metal 38 having a specific plate thickness b corresponding to the thickness D of the core material 3.

  1b to 1e illustrate, in a schematic simplified representation, the basic principle of the method according to the invention for the production of a core 3 with the required shape. FIG. 1 b shows, in a schematic simplified representation, the design of a punching tool 39 consisting of two sub-tools, one bottom part in the form of a mold 40 and one top part in the form of a punch 41. . In the processing, the punch 41 moves toward the sheet metal 38 lying on the base 10. The feed direction is specified by the arrow. From this, the resulting core 3 'with respect to the final shape after punching and the shape of the slot 11' is reproduced in FIG. 1c. The core 3 ′ under this condition and in this position undergoes further stamping operations, in particular achieving the shape of the slot 11 shown in FIG. 1 a with the undercut 36 formed by the projection 37. The stamping tool 42 is applied to the front part 23 of the core 3 ′ and is activated from the side of the front 12 in the direction of the rear 12 against the slot 11 ″ appearing after punching. The starting depth t1, which characterizes the distance of the undercut 36 from the undercut 36, is assured during processing, either by the configuration of the stamping tool 42 and the stamp depth adjusted thereby, or only via the stamp depth. Illustrates the position of the stamping tool 42 towards the final state of the core 3 'after successful stamping, whereby the core 3' corresponds to the core 3 in this state. Characterize the condition of the element to be machined.In order to achieve optimal stamping results, the metal material with good flowability at the selected pressure impact should be sheet metal or thin Preferably, CuNi alloy, Al alloy, Ni alloy, Fe alloy, etc. is used as the metal, for example, stainless steel, CRS1010, building steel, or Cr-Ni steel. The use of steel is particularly preferred.

  In the embodiment shown in FIGS. 1a to 1e, the slots 11 have a circular cross section. However, other forms are also conceivable, in which case the undercut is formed by changing the inside dimensions of the opening. Further, the displayed shape is idealized and reproduced. For example, in practice, surface areas which are not in principle perfectly mutually orthogonal have been developed. Quite importantly, the basic contour from which the slot is created justifies the receipt of the sealed metal pin and prevents the metal pin and, in particular, the fixing material, such as a glass plug, from moving outwards in its entirety. That is, various surface regions forming an undercut and various adjacent surface regions can be arranged orthogonal to each other.

  FIG. 2a illustrates a further design of the core 3.2 using axial cutting through the metal anchor bush 1.2. The basic structure of this metal fixing bush 1.2 corresponds to that described in FIG. 1, for which reason the same reference symbols are used for the same elements. In the embodiment according to FIG. 2a, the slot 11.2 adopts a tapered design. In the processing, the diameter d decreases uniformly from the front 13.2 to the rear 12.3. The uniform reduction in this diameter in the form of a cone implements means 35 for preventing relative movement between the anchor and the inner circumference 15 of the slot.

  FIG. 2b illustrates the core 3 'that results after performing a punching operation after stamping. The slots 11 'can be seen to have equal dimensions throughout. FIG. 2c illustrates a stamping tool 43 having a tapered design and acting against the core 44 from the front 13.2 according to FIG. In contrast, FIG. 3 discloses a combination of the embodiments according to FIGS. 1 and 2, wherein only a portion of the slots 11.3 have a tapered design. In this embodiment, the slot 11.3 of the metal fixing bush 13 is divided into two sections, a first sub-region 16.3 and a second sub-region 17.3, in particular also in the core 3.3. The second sub-region 17.3 is characterized by a constant diameter d2.3 over its length ld2.3. This second sub-region 17.3 extends from the rear 12.3 towards the front 13.3. The first sub-region 16.3 is characterized by a constant cross-sectional reduction of the slot 11.3. This reduction occurs from the diameter d1.3 to the diameter d2.3. The small diameter at the rear 12.2 and 12.3 according to the embodiment of FIGS. 2 and 3 makes the advantage of the larger connecting surface 18 especially for metal pins 5.2 or 5.3 such as ground pins. Has brought. The undercut 36.3 is generated based on a change in diameter when viewed from the second sub-region toward the first sub-region 16.3.

  In all of the embodiments shown in FIGS. 1 to 3, the asymmetrical shape of the slot 11 when sliding from the front part 13 to the rear part 12 causes the sliding of the glass plug 6 in or toward the rear part 12. And has the advantage of preventing withdrawals. In addition, during assembly, the asymmetric shape allows easier positioning of the individual elements, especially the metal pins 4 and 5, with respect to the mounting position. Due to the undercut, loosening of the core of the structural unit consisting of the metal pin 4 and the glass plug 6 during ignition can be avoided. The additional body at the rear 12 provides the advantage of a larger connecting surface for the metal pins 4.5 to be grounded. In addition, this increases the strength of the glass seal of the metal pin during a pressure impact on the front.

  4 and 5 illustrate two further embodiments of the metal anchor bushings 1.4 and 1.5 according to the invention with slots 11.4 and 11.5. In these implementations, slot 11 can be further divided into three sub-regions. In the case of the embodiment according to FIG. 4 for the sub-regions 20, 21, 22 the first and third sub-regions 20 and 22 are preferably characterized by the same diameter d20 and d22. The second sub-region 21 is characterized by a diameter d21 smaller than the diameters d20 and d22 and thus forms a projection 23. This projection forms an undercut 36.4 located between the front and rear, and a glass plug 6.4 in the direction of the rear 12.4 facing the inner circumference 15.4 of the slot 11.4. The relative movement is prevented. The surfaces 24 and 25, which are directed in particular towards the front 13.1 and the rear 12.2, form an axial stop for the glass plug 6.4. This embodiment is characterized by the fixation of the glass plug 6.4 in both directions, and this development is special in that it can be integrated and positioned at random, especially with respect to the connection of the metal pins 4.4. Adapted in a useful way.

  This applies in particular to the analog to the development of the metal anchor bush 1.5 shown in FIG. This development is also divided into at least three sub-regions, these individual sub-regions here being shown as 20.5, 21.5, 22.5 and defining a recess 26, which recess 12. 5 and the front part 13.5. The two outer sub-regions, first sub-region 20.5 and third sub-region 22.5, form process protrusions 27 and 28. The faces 29 and 30 of the individual projections 27 and 28 facing each other form a stop for the cooling glass plug 6.5 with regard to the shift between the rear 12.5 and the front 13.5 in the processing. I have. Both of these embodiments result in the required increase in the hydrostatic force required to initiate the shearing of the glass plug 6 into those parts under pressure loading.

  With all the solutions described so far, a narrower core 3 with an equivalent or increased sealing caused by the glass plug 6 is compared with solutions known in the art. It is possible to use.

  The production of the core 3.4 according to FIG. 4 takes place by punching a core 3 'having a slot 11' with a constant diameter. The protrusions are achieved after punching by double-sided stamping with a stamping tool having a pre-defined stamp depth and a diameter greater than the real diameter of the slot 11 '. When the flow limit is exceeded, a flow of material takes place, which forms a projection 23, due to the increase in the surface tension of the material against the core 3 'under the action of the stamping tool. This is regardless of whether the stamping operation is first performed from the front or rear of the core during processing.

  If a symmetric design is desired, the stamping force and stamp depth should be selected equally for both sides. This implemented embodiment also applies to analogs to the formation of a core according to FIG. Here also, in the first machining step, the outer shape of the core 3.5 'with the slot 11.5' is punched out (punching with a punch). The two projections 27 and 28 in the region of the front part 12 and the rear part 13 are formed by the pressure activated on the front part 12 and the rear part 13 of the core 3.5 '. The expressed form of the recess in the processing is idealized.

  If FIGS. 4 and 5 show various measures on the core 3.4 or 3.5, in particular these slots 11.1 to prevent the relative movement of the glass plug 6 towards the slots 11.4 and 11.5. 4 and 11.5, FIGS. 6 and 7 show that the glass plug 6.6. 5 shows various countermeasures for the metal pin 4.6 or 4.7 which serve to prevent the metal pin 4.6 or 4.7 from coming off from the metal pin 4.6 or 4.7. FIG. 6 shows a combination of the embodiment shown in FIG. 1 with additional modifications of the metal pins 4.6. The pin 4.6 has at least one projection in the region of its connection with the core 3.6, which projection is indicated at 31 and extends circumferentially around the outer circumference 32 of the pin 4.6. In the embodiment shown here, there is the problem of the protrusion 31 extending around the entire outer circumference 32 of the metal pin 4.6. This projection can be formed by compression or tightening (drawing) of the metal pin 4.6. Other possibilities, not shown here, include the arrangement of several projections which are circumferentially adjacent to one another, preferably with an equal spacing on the metal pins 4.6 in the region of connection with the core 3.6. Are arranged adjacent to each other. The features of the protrusions on the metal pins 4.6 contribute significantly to the strength of the connection. This feature prevents the metal pin 4.6 from falling off during the corresponding test, which would normally ruin the metal pin due to stretching stress and glass plug shedding. This applies to the analog to the development according to FIG. According to this development, the metal pin 4.7 has a number of projections arranged in series in the area of contact with the molten glass from the axial extension of the slot. In the simplest case, a decorative groove 33 is used. With this decorative groove, the same effect can be achieved as described in FIG. The remaining structures correspond to those described in FIG. 6, and the same reference symbols have been used for the same elements.

  The embodiments described in FIGS. 6 and 7 can also be combined with measures such as slots, in particular, on the core shown in FIGS.

  FIG. 8 describes a development in which the slot 11.8 has the same diameter over the entire length between the rear part 12 and the front part 13, so that in the region of the rear part 12.8 the core 3.8 Are subjected to a stamping process. This is done by pressurization on the rear 12.8, so that this pressurization is concentrated at a point in the area of the circumference of the slot 11.8. This pressure shock follows the pressure run on the rear 12.8. As a result, projections aligned with the metal pins 4.8 are formed over the entire area of the circumference of the slot 11, and the projections increase in pressure ratio within the slot 11 from the front 13.8 to the rear 12.8. Have a decisive effect on In the illustrated example, projections 37.81 and 37.82 are circumferentially arranged at equal intervals from each other. The glass plug 6.8 can here be a compressed piece.

  FIG. 9 shows an embodiment in which the inner circumference of the slot 11.8 is characterized by a substantially constant mean diameter d1, and additionally the inner circumference of the slot 11.8 in the core 6.8. 15.8 or an embodiment in which the outer periphery of the glass plug 6.9 is subjected to a surface treatment, in particular, achieving a holding effect on the glass plug 6.8 by being subjected to a surface treatment such as sand blasting or contamination. FIG. In the processing, a roughness value in the region of μ ≧ 10 μm is achieved. Roughening serves the purpose of mating and aids strength. In the embodiment shown in FIG. 9, preferably all of the inner circumference 15 of the slot 11.5 undergoes a corresponding surface treatment. Furthermore, there is the possibility of limiting the surface treatment to only one sub-region, so that it extends at least in the region of the rear 12.9.

  In addition, the glass plug inserted into the core can be further surrounded by a socket. The surface of the slot and / or socket and / or the metal pins can then be roughened.

  FIG. 10 illustrates a further alternative development. In this development, the slot 11.9 is characterized by a larger diameter d2 in the region of the rear 12.9 than in the front 13.9. This embodiment allows the slot 11.9 to be designed even in the thicker core 3.9. The slot 11.10 is for example punched or punched only in the sub-region 45.10. The second sub-region 48.10 is formed in both embodiments, for example, by punching this sub-region 46.10. In the punched sub-region 46.10, a glass plug 6.10 is inserted and supported with metal pins 4.10. In order to insert at least one slot, in particular by punching the core, in general, all of the possibilities specified in the description for FIGS. 1 to 9 include inserting this slot in the first sub-region of the core, Suitable for roughing the area, for example by punching the core material. A glass plug 6 with metal pins can then be inserted into the first or second sub-region as described in FIGS. All of the exemplary embodiments described above include a metal anchor bushing that includes two metal pins and is preferably arranged in parallel, one of which is grounded at the rear of the core. Although mentioned, the invention also applies in principle to more than two metal pins and so-called mono pins. A mono pin is an ignition unit that contains only a single metal pin and is held by a pin support. The pins themselves include, for example, metal rings forming ground connections.

  Such a mono pin is shown in FIG. The pin support 100 includes metal pins 103, which are preferably embedded in an insulating panel 104 made of glass. The pin support includes a core 101.1 which places the metal pins 103 in a recess, together with a socket 101.2 with an inner wall panel 101.2.1. The end of the sealed portion of the metal pin 103 is electrically connected to the core material 101.1 by a bridge 105. The slot 106 is located in the core by, for example, a punching step. Such slots may be located in the core as previously described in FIGS. The core 101.1 together with the slot can be stamped as described above. Preferably the slots are stamped together with the core. Particularly preferably, the core forms an integral component with the socket 101.2. The manufacture of an integral component can occur, for example, by having punches punched in a single method step, and the socket can be obtained by a deep drawing method.

  Preferably, the inner wall panel of the socket is coated with the free ends of the metal pins 103. For example, gold is used as the coating material. Preferably, the coating is applied using an electrolytic technique. The coating serves the purpose of keeping the electrical resistance at the junction 108 between the plug 120 inserted into the socket and the interior 101.1.2 of the socket 101.2 low. This plug is designated at 120 in the figure.

  In all of the embodiments shown in FIGS. 1 to 10, the core material 3 as a turning part in the embodiment according to the state of the art has been replaced by stamped metal parts. Separate measures for preventing withdrawal of the metal pins 4 from the core under stress are provided on the core 3 in the individual drawings to prevent the metal pins from being pulled out of the fixing material on the metal pins. And can be used in combination with each other. In this regard, the implementation is not subject to any restrictions. However, these embodiments aim to ensure a high strength of the overall connection between the metal pins 4 and the core 3 and hence the metal fixing bush 1.

  With all of the embodiments depicted in the accompanying drawings, the slots may be formed with variable cross-sections. Preferably, however, a circular cross section is selected. The formation of the undercut occurs as an integral component of the core.

FIG. 1a shows a first embodiment of a metal anchor bushing designed according to the invention, and FIGS. 1b to 1e show a greatly simplified basic principle of the method according to the invention for manufacturing a core according to the invention. FIG. FIG. 2a illustrates a second embodiment of a metal anchor bush according to the invention with a tapered design of the slots, and FIGS. 2b to 2c illustrate the invention for manufacturing a core according to FIG. 2a after a punching operation. 3 illustrates a further embodiment of the method according to FIG. FIG. 3 illustrates a third embodiment of a metal anchor bush according to the present invention, with a partial tapered design of the slot. FIG. 4 illustrates an embodiment of a metal anchor bushing designed in accordance with the present invention, with protrusions between the front and rear within the contour defining the slot. FIG. 5 illustrates an embodiment of a metal anchor bushing designed in accordance with the present invention with a recess between the front and rear within the contour defining the slot. FIG. 6 illustrates an embodiment of a metal anchor bush designed in accordance with the present invention, with additional protrusions on the metal pins. FIG. 7 shows a further development according to FIG. FIG. 8 illustrates a further embodiment of a metal anchor bushing designed according to the invention, with a one-point constriction of the cross section in the rear region. FIG. 9 illustrates an embodiment of a metal anchor bushing designed in accordance with the present invention with a texture in the slot. FIG. 10 illustrates a further alternative embodiment of a metal anchor bushing designed in accordance with the present invention. FIG. 11 illustrates an embodiment with metal pins such as so-called mono pins.

Explanation of reference numerals

1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 Metal fixing material bush 2 Metal collar 3, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9 Heartwood 3 ', 3.2' Corewood 4, 4.2, 4.3 as a semi-finished product during manufacture 4.4, 4.5, 4.6, 4.7, 4.8, 4.9 Metal pins 5 Metal pins 6, 6.2, 6.3, 6.4, 6.5, 6.6 6.7, 6.8, 6.9 Glass plug 7 First surface 8 Second surface 9 Punched element 10 Perimeter 11, 11.2, 11.3, 11.4, 11.5, 11 .6,11.7,11.8,11.9 Slot 11 ', 11.2' Slots 12, 12.2, 12.3, 12.4, 12.5, 12.6, 12. 7, 12.8, 12.9 Rear part 13, 13.2, 13.3 13.4, 13.5, 13.6, 13.7, 13.8, 13.9 Front part 14 Outer circumference 15 Inner circumference 16 First sub-region 17 Second sub-region 19 Connecting surface 20, 20.5 First Sub-regions 21 and 21.5 Second sub-regions 22 and 22.5 Third sub-region 23 Projection 24 Surface 25 Surface 26 Depression 27 Projection 28 Projection 29 Surface 30 Surface 31 Projection 32 Depression 33 Opening 34 Fixing material 35 Fixing material and slot Materials 36, 36.2, 36.3, 36.4, 36.5, 36.6, 36.7, 36.8 undercut 37, 37.3 to prevent relative movement between inner circumferences , 37.4, 37.5, 37.6, 37.7, 37.81, 37.82 Projection 38 Sheet metal 39 Punching tool 40 Mold 41 Punch 42 Stamping tool 43 Stamping tool 44 Mold 45 First sub-region 46 Second Sub-region 100 Pin support 1 1.1 Core material 101.2 Core material socket 101.2.1 Socket inner wall panel 103 Metal pin 105 Bridge 106 Slot 108 Junction point 120 Plugs d1, d3 diameter d2, d2.3 diameter ld1 inserted into the socket Length ld2 length ld1.3 length ld2.3 length

Claims (43)

A metal anchor bushing, especially a glass-to-metal bushing for the igniter of an airbag or belt tension pulley,
At least one metal pin disposed in a slot in the core via a fixing material, wherein the core has a front portion and a rear portion, wherein the core material includes:
The core is formed by one element, and the shape of the core defining the slot is created by at least one other process;
Means for preventing relative movement of the anchor in the direction of the rear facing the inner periphery of the slot are provided between the front and rear of the core;
A metal anchor bush comprising being characterized by:   The bush according to claim 1, wherein the contour defining the final shape is created by the further processing.   Metal bush according to claim 1 or 2, characterized in that the means are an integral component of the core or form a structural unit with them.   The metal fixing material bush according to any one of claims 1 to 3, wherein the metal fixing material bush includes at least two metal pins arranged in parallel with each other.   5. The metal bush according to claim 1, wherein the metal pin is rigidly connected to a fixing material producing a fixing material plug.   The metal fixing material bush according to claim 5, wherein the metal pin is sealed by the fixing material.   7. The metal bush according to claim 1, wherein a glass plug made of molten glass or a high-performance polymer is used as the fixing material.   The means for preventing relative movement of the anchoring material in the direction of the rear facing the inner periphery of the slot comprises, as viewed from the rear, the means on the inner periphery of the slot in the core within the core. The metal bush according to any one of claims 1 to 7, further comprising at least one undercut disposed between a rear part and the front part.   9. The bush according to claim 8, wherein the undercut is formed by at least one protrusion. The slot is characterized by two sub-regions, a first sub-region extending from the rear toward the front and a second sub-region extending from the front toward the rear. That
The protrusion is formed by the second sub-region characterized by a smaller inner dimension than the first sub-region;
Said first and second sub-regions having an undeformed shape having a constant inside dimension over their length;
The metal fixing material bush according to claim 9, characterized in that: The slot is characterized by two sub-regions, a first sub-region extending from the rear toward the front and a second sub-region extending from the front toward the rear. That
The protrusion is formed by the second sub-region characterized by a smaller inner dimension than the first sub-region;
The first and / or second sub-regions have variable shapes and / or different inner dimensions over their length;
The metal fixing material bush according to claim 9, characterized in that:   The bush according to claim 11, wherein the first sub-region is characterized by a reduction in dimension from the front to the second sub-region.   Metal bush according to claim 11 or 12, characterized in that the slot also represents a circular cross section, at least the first sub-region, more preferably the tapered second sub-region.   The metal fixing material bush according to claim 8, wherein the undercut is centrally arranged. Undercut in both directions,
A first sub-region extending from the rear to the front, a second sub-region adjacent to the first sub-region, and a third sub-region extending from the front to the rear. Being characterized by three sub-regions with sub-regions;
The second sub-region is characterized by a smaller dimension than the first and third sub-regions;
The metal fixing material bush according to claim 8, 9 or 14, wherein: Undercut in both directions,
A first sub-region extending from the rear to the front, a second sub-region adjacent to the first sub-region, and a third sub-region extending from the front to the rear. Being characterized by three sub-regions with sub-regions;
The second sub-region is characterized by a larger dimension of the slot than the first and third sub-regions;
The metal fixing material bush according to claim 8, 9 or 14, wherein:   17. The bush according to claim 15, wherein the first and third sub-regions are characterized by equal cross-sectional dimensions.   18. A method according to claim 9, wherein a number of protrusions are provided circumferentially spaced apart from each other on a common length between the front part and the rear part. The metal fixing material bush according to claim 1.   19. The metal bush according to any one of the preceding claims, wherein the slot represents a circular cross section.   19. A bush according to any one of the preceding claims, wherein the slots represent a randomly selectable cross-section.   21. The metal bush according to any one of claims 1 to 20, wherein the core is formed by stamped metal parts.   22. The bush of claim 21, wherein the stamped metal part is polished.   The means for preventing relative movement of the anchor in the direction of the rear facing the inner periphery of the slot includes at least one determinant between the anchor plug and a portion of the slot. 23. A bush according to any one of the preceding claims, characterized in that it comprises a simple connection.   9. The method as claimed in claim 1, wherein the means comprises an element inserted in the slot, wherein the inner circumference of the slot and / or the outer circumference of the element exhibit a roughness of ≧ 10 μm. The metal fixing bush according to any one of the above.   25. A method according to any of the preceding claims, wherein means are provided on the metal pin to prevent relative movement of the metal pin opposite the fixing material. Metal fixing material bush.   16. The method of claim 15, wherein the means for preventing relative movement of the metal pin opposite the anchor comprises at least one radial projection on the metal pin. Metal fixing bush.   27. The bush of claim 26, wherein the protrusion is an integral component of the metal pin.   28. The metal bush according to claim 26, wherein the protrusion is formed by an element connected to the metal pin.   27. The means for preventing relative movement of the metal pin opposite the anchor comprises a plurality of axially adjacent radial projections on the metal pin. 29. The metal-fixing-material bush according to any one of to 28.   30. The metal bush according to any one of claims 1 to 29, wherein at least two metal pins are provided.   31. The bush of claim 30, wherein the two or more metal pins are arranged parallel to one another.   32. The metal bush according to any one of claims 30 and 31, wherein the second metal pin is grounded at the rear of the core.   30. A core as claimed in any of claims 1 to 29, characterized in that a metal pin is provided, which is arranged in the slot in the core via a fixing and which is accompanied by a grounded socket of the core. A metal fixing material bush according to any one of the preceding claims. A method for manufacturing a core material of a metal bush according to any one of claims 1 to 33,
From one part, such as a sheet metal part, with a predetermined thickness, the final contour defining the outer shape is obtained by another processing,
A method comprising forming the slot for at least one metal pin, wherein the basic shape defining the starting form of the slot is obtained by punching (punching) the part, in particular the sheet metal part. . The final contour defining the contour obtained by the further machining and the basic shape defining the starting form of the slot are produced in one processing step in the form of a tool punch. 35. The method according to claim 34, characterized in that:   36. The method of claim 34 or 35, wherein the undercut in the slot is formed by deformation of the slot.   37. The method according to claim 36, wherein said deformation is achieved by at least one stamping operation.   38. The method of claim 36 or 37, wherein the stamping and punching operations are performed from the same side of the core.   38. The method of claim 36 or 37, wherein the stamping and punching operations are performed from different sides of the core.   40. A method according to any one of claims 36 to 39, wherein the stamping and punching operations are performed from both sides of the core.   41. The method according to claim 40, wherein either different tools with the same parameters or the same tools are used for stamping and punching.   42. A stamping operation according to claim 34, characterized in that a stamping operation is performed prior to punching (punching) of the slot in the area of the slot to be produced on the sheet metal part. The method according to any one of the preceding claims.   43. The method according to any one of claims 34 to 42, wherein the socket of the core is obtained after punching by a deep drawing method.

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