JP2015143611A - Metal fixing bush, and method of manufacturing core of metal fixing bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal fixing bush ensuring low material cost, low labor cost, high strength, and adaptability to higher stress, and further capable of avoiding fault assembly resulting from incorrect matching of individual elements.SOLUTION: A metal fixing bush 1 is one such as a glass-to metal bush, in particular, for use in an igniter of an airbag or a belt-tension pulley, comprises at least one metal pin 4 disposed in a slot 11 within a core 3 via a fixing material 34, the core 3 having a front portion 13 and a rear portion 12, the core 3 being formed of one element, a shape of the core defining the slot being produced by at least one another processing, and means 35 for preventing the relative movement of the fixing member 34 in a direction of the rear portion 12 facing an inner circumference 15 of the slot 11 being provided between the front portion 13 and the rear portion 12.

Description

  The present invention particularly relates to a metal fixing material bush having the features of the preamble 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 preamble of claim 23.

  Various designs of metal fastener bushings are known in the art. By means of a metal fixing bush, a vacuum hermetic seal made of a fixing material, in particular a glass-to-metal vacuum hermetic seal, is understood. Metal acts as a conductor. See typically US Pat. Such bushings are common in terms of electronic and electrical engineering. The glass used for sealing serves as an insulator. A typical metal fixture bushing is manufactured so that a metallic inner conductor is contained within a pre-formed sintered glass part, so that the sintered glass part or glass tube is within the outer metal part, It is sealed with a so-called core material. For example, an igniter is a suitable application for such a metal fixture bush. This igniter is used, inter alia, for airbags or belt extension pulleys in automobiles and the like. In this case, the metal fixing material bush is a component of the ignition device. In addition to the metal fixture bushing, the entire igniter includes a spark plug and a metal cover that tightly encloses the ignition mechanism. One, two, or more than three metal pins can penetrate the bush. In the preferred embodiment with one metal pin, the casing is grounded, and in the preferred bipolar 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 similar type are described in US Pat. The ignition unit mentioned earlier has two metal pins. However, the electronic ignition device can comprise only a single pin. The ignition device shown in the prior art comprises a metal core, for example a metal sleeve, which is configured as a swivel. The metal core has at least one through opening through which at least one metal pin can pass. One significant problem with this design lies in the fact that it is material and cost intensive.

US5345872 US3274937 US6274252 US56211183 DE2904174A1 DE 199 27 233 A1

  It is therefore an object of the present invention to produce a metal anchor bushing of the type described above which can maintain high strength, keep material and labor costs low, and can handle higher pressures, It is to avoid an assembly error due to the inaccuracy of.

  The solution of the invention is characterized by the features of claim 1. A technical embodiment for the manufacture of the core is described in claim 34. Preferred embodiments are reproduced in the dependent claims.

  The metal fixing member bush includes a metal core, and at least one metal pin passes through the metal core. When two metal pins are provided in the preferred embodiment, one of these two metal pins forms a ground connection with the core material at least directly or indirectly through additional elements. In embodiments comprising two metal pins, these metal pins are preferably arranged parallel to each other. At least one of the metal pins is disposed in the through opening of the core material and is preferably fixed to the core material by a fixing material in the form of a glass plug. The core material according to the present invention is formed by a thin metal plate element, and in the first embodiment, at least the through opening is manufactured by separation processing, particularly punching.

  The core material itself is preferably formed by stamping a solid material, and the final shape of the core material is achieved by a molding process such as a deep drawing method. In a preferred embodiment, the final shape defining the outer contour and the basic shape defining the through-opening are manufactured by one separation process, in particular punching / stamping. The final shape is a shape that does not need to be subjected to any further molding process. The basic shape represents the final shape when there are no further changes required, or is the basic shape changed by further manufacturing methods, especially molding methods, and the final shape is achieved after these additional methods , Either. Means are provided between the front portion and the rear portion to prevent the fixing member from moving relative to the inner periphery of the through opening in the direction of the rear portion. This means may be an integral component of the core material or form one component unit with the core material.

  The manufacture of the shape by separation means that the final shape on the outer periphery of the core material is manufactured by blanking, and the shape of the through opening is manufactured by punching. The means for avoiding relative movement of the fixing material relative to the inner periphery of the through-opening in order to control problems that occur when sealing the individual metal pins in the through-opening and the fixing material And a unit comprising a metal pin is provided to control the safety against being pulled out. This means acts as a kind of barb and provides a definite connection (shape connection) between the fixing plug, in particular the glass plug and the core, during relative movement in the rear direction. This means includes, for example, at least one local diameter reduction in the through-opening, and can be formed in the entire inner peripheral region other than the front portion of the core material.

  In the present invention, raw materials are significantly minimized because more cost effective manufacturing methods and starting materials are used. Further, the entire core material is designed as an integral component, and the metal pin is sealed with a fixing material in the core material. Another significant advantage is that the metal pin is safely prevented from being pushed out of the through-opening with the glass plug, even when the load on the individual metal pin, for example the pressure load, is increased. The overall design is also applicable to smaller sizes with a smaller width and ensuring the fixation of the metal pins within the core material even under larger loads.

  What is important is that a local reduction in diameter occurs in the cross section in the rear region or in the region between the rear and front, and the front always has a larger diameter than the rear. .

  In a particularly advantageous design, the second metal pin is grounded or fixed on the back of the core as a ground pin. As a result, an additional measure of grounding or electrically coupling the metal pin fixed in the core with the fixing is no longer necessary. Furthermore, the presence of only one pin that should still be fixed in the through-opening offers a more variable possibility of fixing that single pin completely circumferentially and the potential connection to the ground pin The face can be expanded.

  As the fixing material, for example, a glass plug, a ceramic plug, a glass ceramic plug, or a high-performance polymer can be used.

  There are numerous possibilities for specific examples of means for preventing relative movement between the anchoring material and the through-opening, in particular slipping. These are characterized by means on the heartwood. In the simplest case, the means on the core can be embodied in production, in particular during the punching process. The through opening between the rear part and the front part is characterized by a change in the cross-sectional profile. In the simplest case, at least two regions with different inner dimensions are provided as embodiments of through openings with circular cross-sections with different diameters. The cross-sectional change occurs stepwise or continuously. In the case of a continuous cross-sectional change, the through opening between the front part and the rear part has a conical shape (tapered shape), and the through opening becomes narrower toward the rear part.

  Further means on the core are characterized by a plurality of recesses or protrusions (projections). These form at least one undercut disposed between the rear part and the front part on the inner circumference of the through opening in the core material. Such an undercut is not formed in the front part. When the through-opening has a symmetric structure, a first subregion extending from the rear portion toward the front portion, a second subregion connected to the first subregion, and a third subportion extending from the front portion toward the rear portion And the three subregions of the region. The second subregion has a smaller or larger diameter of the through opening than the first subregion and the third subregion. Then, preferably, the first sub-region and the third sub-region have the same cross-sectional dimension.

  In embodiments with more than two regions of different dimensions, in particular different diameters, the method resulting from processing both sides of the core is selected. In the embodiments described above, if a symmetrical shape of the through-opening is intended, in embodiments involving more than two regions, preferably a through-opening that can be used in any way with respect to the mounting position is selected. It is designed symmetrically with respect to the theoretical centerline (extending perpendicular to the pin axis of the metal pin in the core and into the central region of the core). In this case, the front part and the rear part are interchangeable with respect to their function. The undercut formed in this way prevents the possibility of the fixing material plug moving in both directions.

  In a further design, a number of protrusions can be arranged circumferentially separated from each other on a common circumference between the front part and the rear part. These protrusions are in principle produced in the rear region by stamping, ie local shaping under pressure. Therefore, the manufacturing process is particularly cost effective.

  Another option for preventing relative movement between the fixing plug and the through-opening is the formation of a force coupling (frictional coupling, non-deterministic coupling) between them. For example, glass is typically placed in an opening with metal pins, the glass and metal ring are heated, and after cooling, the metal heat shrinks onto the glass plug. In general, the through opening essentially represents the final diameter after punching of the through opening. Of course, the punched through opening itself is machined, for example polished, but the final diameter does not change significantly. The through opening may have a circular cross section. Other possibilities such as oval are also conceivable.

  In a preferred embodiment for preventing relative movement between the metal pin and the fixing material under the action of a load, means on the metal pin are provided. This means may be a protrusion or recess extending over the entire outer periphery of the metal pin, or it may be a random or predetermined spacing protrusion disposed adjacent to each other in the circumferential direction.

  A method for manufacturing a core material for a metal bush is characterized in that a final contour defining an outer shape is obtained from a sheet metal part having a predetermined thickness by a separation process without using machining. For the formation of a through opening for at least one metal pin, the basic shape defining the form of the through opening is achieved by punching a sheet metal part. Both operations (operation for the outer shape of the core and operation for the through opening) can be one tool and one processing step for cost savings. The undercut in the through opening is formed by deformation of the through opening by stamping, for example. Individual stamping can be performed before and after punching / stamping. Preferably, stamping and punching / stamping are performed on the same face of the core material to avoid unnecessary workpiece position changes. Stamping and punching / stamping are performed immediately after one.

  Corresponding to the desired shape to be achieved, stamping is performed on one or both sides, in the latter case it is preferable to set the same stamping parameters so that a symmetrical through-opening is achieved. Realize.

  The solution of the present invention is described in detail below with reference to the drawings.

FIG. 1a shows a first embodiment of a metal anchor bush according to the present invention, and FIGS. 1b to 1e schematically show a method for manufacturing a core material according to the present invention. FIG. 2a shows a second embodiment of a metal anchor bush according to the invention with a conical through opening, and FIGS. 2b and 2c show a method for producing the core material according to FIG. 2a by stamping. Fig. 4 shows a third embodiment of a metal anchor bush according to the present invention with a partial conical through opening. Fig. 3 shows an embodiment of a metal anchor bush according to the present invention having a protrusion in the through opening defining the contour and between the front and rear. 1 shows an embodiment of a metal anchor bushing according to the present invention having a recess in a through opening defining a contour and between the front and rear. 1a shows an embodiment in which the metal anchor bushing of FIG. 1a has additional protrusions added on the metal pins. The modification of FIG. 6 is shown. Fig. 4 shows a further embodiment of a metal anchor bushing according to the present invention in which the cross-section is reduced by a single point in the rear region. 2 shows an embodiment of a metal anchor bush according to the present invention having a surface pattern in a through opening. Fig. 4 shows a further embodiment of a metal anchor bush according to the present invention. An embodiment with so-called mono-pin metal pins is shown.

FIG. 1a shows, in axial section, a first embodiment of a metal fixing bush 1 according to the invention, for example for an igniter of an airbag. The metal fixing material bush 1 comprises a core material 3 forming a metal collar 2, by which two parallel metal pins 4 and 5 are electrically coupled. The two metal pins 4 and 5 are arranged parallel to each other. The first pin functions as a conductor and the second pin is grounded. In FIG. 1a, the first metal pin 4 functions as a conductor, and the second metal pin 5 functions as a ground pin. At least one of the metal pins 4 and 5, particularly the metal pin 4 functioning as a conductor, penetrates the core material 3. In FIG. 1 a, the ground pin 5 is directly attached to the rear part 12 of the core material 3. The metal pin 4 is sealed in a part l ₁ of its length l in the fixing material 34, in particular in a glass plug 6 cooled from molten glass. The metal pin 4 protrudes from at least one side 7 of the glass plug 6. In the embodiment of FIG. 1 a, the metal pin 4 is sealed in the same plane as the other side 8 of the glass plug 6. Yes. Other variations are also conceivable. Preferably, not only the through-opening but also the core 3 is implemented as a punching / stamping element 9. This means that the outer contour, in particular the shape that defines the outer periphery 10, is produced by blanking, preferably stamping. The punching / stamping part can continue to be used in its shape after punching / stamping or can be deformed, eg deep drawn, in further operations. The through-opening 11 for receiving and fixing the metal pin 4 via the glass plug 6 is produced in the preferred embodiment by punching in the form of a slot. Subsequently, the metal pin 4 is inserted into the through opening 11 at the rear portion 12 of the metal fixing material bush 1 together with the glass plug, the metal core material including the glass plug and the metal pin is heated, and after cooling, the metal is thermally contracted. As a result, a force coupling (frictional coupling, non-deterministic coupling) between the glass plug 6 with the metal pin 4 and the core material 3 is formed. It is also conceivable to insert a molten or fluidized fixing material, in particular molten glass, into the through opening 11 from the front part 13. During cooling, shape bonding (deterministic bonding) and material bonding are provided both between the fixing member 34 and the outer periphery 14 of the metal pin 4 and between the fixing member 34 and the inner periphery 15 of the through opening 11. . During ignition, pressure is applied to the entire metal fixing material bushing 1 to prevent the metal pin 4 from coming out of the core material 3 together with the glass plug 6, so that the fixing material 34 is located in the rear portion 12 with respect to the inner periphery 15 of the through opening. Means 35 are provided for preventing relative movement in the direction. This means 35 acts as a kind of barb and provides a shape connection between the core 3 and the glass plug 6 under tension and / or pressure against the glass plug 6 and / or the metal pin 4. And prevents the glass plug 6 from sliding against the core 3 at the rear 12. In the first embodiment, the through-opening 11 is designed to have an undercut 36 formed from the protrusion 37. The protrusion 37 is provided in the region of the rear portion 12 and is substantially flush with the rear portion 12 in FIG. In FIG. 1a, the through-opening 12 is preferably designed to have a circular cross-section, and with this protrusion 37 has two different diameters d ₁ and d ₂ .

The diameter _{d 1} is larger than the diameter _{d 2.} The diameter d ₂ is a diameter at the rear portion 12 of the through opening 11. The diameter d ₁ is a diameter at the front portion 13 of the through opening 11. The through-opening 11 has the same diameter d ₁ over its length ld ₁ . ld ₂ represents the length of the through opening 11 having the diameter d ₂ . That is, the through-openings, has two sub-areas of the first sub-region 16 and the second sub-region 17, the first sub-region 16 is characterized by a diameter d _1, second sub-region 17 by a diameter d ₂ It is characterized. These diameters d ₁ , d ₂ are for slot-shaped single-side punching on the surface of the front part 13 or the rear part 12 and subsequent deformation work under pressure, in particular for the core 3 as shown in FIGS. 1b and 1c. Formed by stamping. Preferably, the punching and the deformation work are each performed from the same plane, and in the example of FIG. Blanking of the core 3 can also be performed within punching / stamping or within a previous cutting operation (eg, water jet cutting or laser beam cutting). Preferably, blanking of the core material 3 is performed by punching / stamping. The tool for this purpose is designed so that the entire core material 3 having the through-opening 11 can be punched / stamped in one processing step from a thin metal plate 38 having a specific plate thickness b corresponding to the thickness D of the core material 3. .

  1b to 1e schematically show the basic principle of the method of the invention for producing a core material 3 having a desired shape. FIG. 1 b schematically shows the design of a punching / stamping tool 39 consisting of two auxiliary tools, a lower part in the form of a die 40 and an upper part in the form of a punch / stamp 41. The punch / stamp 41 moves toward the sheet metal 38 on the die 40. The feed direction is indicated by an arrow. FIG. 1c shows the core 3 'having the final outer shape and the shape of the through opening 11' after punching / stamping. Further stamping is performed on the core material 3 ′ in this state and at this position to form the shape of the through-opening 11 shown in FIG. The stamping tool 42 is arranged at the front part 13 of the core material 3 ′ and is pressed in the direction from the front part 13 toward the rear part 12 against the through-opening 11 ′ that appears after punching / stamping. The effective depth t1 characterizing the distance from the front 13 to the undercut 36 in the final state of the core 3 is determined by the form of the stamping tool 42 and the stamp depth adjusted thereby or by the stamp depth alone. Is done. FIG. 1 e shows the final position of the stamping tool 42 towards the core 3 ′ (ie after successful stamping), in which the core 3 ′ corresponds to the core 3. The metal finish characterizes the condition of the element to be processed during manufacture. In order to achieve an optimal stamping result, a metal material with good flowability at a selected pressure action is used as the sheet metal 38 or thin element. Preferably, CuNi alloy, Al alloy, Ni alloy, Fe alloy or the like is used as the metal. For example, the use of steel such as stainless steel, CRS 1010, architectural steel or Cr—Ni steel is particularly preferred.

  In the embodiment shown in FIGS. 1a to 1e, the through opening 11 has a circular cross section. However, other forms are possible, in which case the undercut is formed by changing the inner dimension of the opening. Further, the illustrated shape is ideally depicted. For example, in fact, generally surface areas that are not completely orthogonal to one another result. Very importantly, the basic contour of the through-opening on the one hand allows the reception of a sealed metal pin material (by a fixing material) and on the other hand a metal pin and fixing material (especially a glass plug). Is that the surface area forming the undercut and the adjacent surface area can be arranged at a predetermined angle with respect to each other.

  FIG. 2a shows a further embodiment of the core material 3.2 according to an axial cross-section of the metal anchor bushing 1.2. The basic structure of the metal fixing material bush 1.2 corresponds to that described in FIG. 1, and therefore the same reference numerals are used for the same elements. In the embodiment described in FIG. 2a, the through opening 11.2 is conical (tapered). The diameter d gradually decreases from the front 13.2 to the rear 12.2. By reducing the diameter in the form of a cone, a means 35 for preventing relative movement between the fixing material and the inner periphery 15 of the through opening is realized.

FIG. 2 b shows the core material 3.2 ′ resulting after punching (through opening) after stamping (outside shape). The through-opening 11.2 'has the same dimensions throughout the front 13.2 to the rear 12.2. The stamping tool 43 shown in Fig. 2c has a conical design and acts on the die 44 from the front 13.2 to the core material 3.2 'according to Fig. 2b. In contrast to this, FIG. 3 shows a combination of the embodiments according to FIGS. 1 and 2, in which part of the through-opening 11.3 is conical. In this embodiment, the through opening 11.3 of the metal fixing material bush 1.3 is divided into two sections of a first sub-region 16.3 and a second sub-region 17.3 in the core material 3.3. Yes. The second sub-area 17.3 has a constant diameter _{d 2.3} over its length _{ld 2.3.} This second subregion 17.3 extends from the rear part 12.3 towards the front part 13.3. In the first sub-region 16.3, the cross section of the through opening 11.3 is decreased (gradually decreased) at a constant rate. The cross section of the through opening 11.3 decreases from a diameter _d1.3 to a diameter _d2.3 . In the embodiment of FIGS. 2 and 3, the connection surface 18 is particularly large for the metal pins 5.2, 5.3, which are ground pins, due to the small diameter (of the through opening) in the rear parts 12.2, 12.3. The following advantages arise. The undercut 36.3 is generated based on a change in diameter when viewed from the second subregion 17.3 toward the first subregion 16.3.

  In all the embodiments shown in FIGS. 1 to 3, the through-opening 11 has an asymmetric shape in the direction from the front portion 13 to the rear portion 12 (because the shapes of the front portion 13 and the rear portion 12 are different). The advantage is that the glass plug 6 is prevented from slipping out of the rear part 12 or the glass plug 6 is prevented from sliding in the direction of the rear part 12. In addition, during assembly, the asymmetric shape facilitates the positioning of the individual elements, in particular the metal pins 4 and 5, relative to the mounting position. Based on the undercut, the structural unit consisting of the metal pin 4 and the glass plug 6 is prevented from sagging with respect to the core material during ignition. The additional material at the rear 12 provides the advantage that the connecting surface 18 for the metal pin 5 to be grounded is large. Furthermore, this increases the strength of the glass seal of the metal pin during the pressure action on the front.

FIGS. 4 and 5 show two further embodiments of metal fastener bushes 1.4 and 1.5 according to the present invention with through openings 11.4 and 11.5. In these embodiments, the through opening 11 is further divided into three subregions. In the embodiment of FIG. 4, it is divided into sub-regions 20, 21, 22, first sub-region 20 and the third sub-region 22 preferably has the same diameter _{d 20} and _{d 22.} The second sub-region 21 has a diameter _{d 20} and _{d 22} is smaller than the diameter _{d 21,} and forms a protrusion 23 accordingly. This projection 23 forms an undercut 36.4 disposed between the front 13.4 and the rear 12.4, and the glass plug 6.4 is the inner circumference 15.4 of the through opening 11.4. On the other hand, relative movement in the direction of the rear portion 12.4 is prevented. In particular, the surfaces 24 and 25 facing the front part 13.4 and the rear part 12.4 form a stop surface in the axial direction of the glass plug 6.4. This embodiment is characterized by the fixing of the glass plug 6.4 in both directions, and this embodiment is particularly beneficial as it can be randomly integrated and positioned, especially with respect to the connection of the metal pins 4.4. Adapted in different ways.

  The same applies to the metal anchor bushing 1.5 in FIG. 5, in particular the core material 3.5. The example of FIG. 5 is also divided into at least three subregions, the individual subregions 20, 21, 22 defining a recess 26, which is a rear 12.5 and a front 13.5. It is arranged between. The two outer subregions, that is, the first subregion 20 and the third subregion 22 form protrusions 27 and 28. Opposing surfaces 29 and 30 of the individual protrusions 27 and 28 form a stop when the cooling glass plug 6.5 shifts between the rear 12.5 and the front 13.5. The embodiment of FIGS. 4 and 5 increases the required hydrostatic force and initiates shear on those parts of the glass plug 6 during pressure loading.

  All of the solutions described above allow the use of a thinner core 3 with the same or increased sealing produced by the glass plug 6 compared to solutions known to those skilled in the art.

  In the manufacture of the core material 3.4 in FIG. 4, the through-hole 11 ′ having a constant diameter is formed by punching / stamping the core material 3 ′. Protrusion is achieved by double-sided stamping with a stamping tool having a predetermined stamp depth and a diameter larger than the diameter of the through opening 11 'after punching / stamping. When the flow limit is exceeded, under the action of the stamping tool, based on the increase of the surface tension of the material with respect to the core material 3 ′, the material flows, which forms the protrusions 23. Stamping may be performed first on either the front or back of the core.

  If a symmetrical design is desired, the stamping force and stamp depth should be chosen equally for both sides. A similar method is applied to the core material of FIG. In FIG. 5, in the first processing step, the outer shape of the core material 3.5 'is punched / stamped with the through opening 11.5'. The protrusion 27 in the region of the rear part 12 and the protrusion 28 in the region of the front part 13 are formed by pressure acting on the rear part 12 and the front part 13 in the core material 3.5 ′. The shape of the depicted recess is idealized.

  4 and 5 show the means for preventing the relative movement of the glass plug 6 on the cores 3.4 and 3.5, in particular on the through openings 11.4 and 11.5. 7 is a means on the metal pin 4.6 or 4.7, during the test and ignition operation, the metal pin 4.6 or 4.7 is a glass plug 6.6. Or means for preventing the exit from 6.7. FIG. 6 shows a combination of the embodiment described in FIG. 1 with an additional modification of the metal pin 4.6. The pin 4.6 has at least one protrusion 31 in the coupling region with the core material 3.6, and the protrusion 31 extends in the circumferential direction of the outer periphery 32 of the pin 4.6. In the embodiment of FIG. 6, the protrusion 31 extends on the entire outer periphery 32 of the metal pin 4.6. The protrusion 31 can be formed by compressing or tightening (squeezing) the metal pin 4.6. Although not shown in the drawings, several protrusions adjacent to each other in the circumferential direction are preferably arranged adjacent to each other at equal intervals on the metal pin 4.6 in the coupling region with the core material 3.6. Forms are also possible. The protrusion 31 on the metal pin 4.6 contributes considerably to the improvement of the connection strength. This protrusion prevents the metal pin 4.6 from falling off during a corresponding test where the metal pin normally fails due to tensile stress and glass plug removal. In FIG. 7 this applies as well. In the example of FIG. 7, the metal pin 4.7 has a large number of protrusions arranged continuously along the axial direction of the through opening in the contact area with the molten glass. In the simplest case, fluting 33 is used. This fluting 33 achieves the same effect as described in FIG. In FIG. 7, the remaining structure is similar to that described in FIG. 6, and the same reference numerals are used for the same elements.

  The embodiment described in FIGS. 6 and 7 can also be combined with the core material described in FIGS.

  FIG. 8 shows an embodiment in which the through opening 11.8 has the same diameter over the entire length between the rear 12.8 and the front 13.8, the core material 3.8 is a region of the rear 12.8. It is stamped inside. This is performed by pressurizing the rear portion 12.8, and this pressurization is performed so as to concentrate on a predetermined point in the circumferential region of the through opening 11.8. This pressure action is caused by the pressurization on the rear 12.8. As a result, the projection directed to the metal pin 4.8 is formed over the entire circumferential area of the through opening 11.8 and the pressure of the front 13.8 versus the rear 12.8 in the through opening 11.8. Has a large effect on the ratio. In the case of FIG. 8, projections 37.81 and 37.82 are formed that are arranged at equal intervals in the circumferential direction. The glass plug 6.8 can be a compression piece.

FIG. 9 shows an embodiment in which the inner circumference of the through-opening 11.9 is characterized by a substantially constant average diameter d ₁ , which further includes a through-opening 11. The inner periphery 15.9 of 9 or the outer periphery of the glass plug 6.9 is subjected to a surface treatment, and in particular, a surface processing treatment such as sand blasting or staining is applied to achieve the holding effect of the glass plug 6.9. Yes. A roughness in the range of μ ≧ 10 μm is achieved. The surface roughness serves as a fitting function and improves the strength. In the embodiment shown in FIG. 9, it is preferable to perform a corresponding surface treatment on the entire inner periphery 15.9 of the through opening 11.9. It is also possible to limit the surface treatment to only one sub-region, for example at least the region of the rear 12.9.

  It is also possible to enclose a glass plug inserted into the core with a socket. It is also possible to roughen both or one of the surface of the through opening and / or the socket and the surface of the metal pin.

FIG. 10 shows a further embodiment. In this embodiment, the through opening 11.10 has a larger diameter _{d 2} in the region of the rear 12.10 than front 13.10. This embodiment also allows for the design of the through opening 11.10 in the thicker core 3.10. The through-opening 11.10 is, for example, punched or perforated only in the subregion 45. The second subregion 46 is formed, for example, by drilling the subregion 46. A glass plug 6.10 with a metal pin 4.10 is inserted and supported in the drilled subregion 46. In general, all embodiments described in FIGS. 1 to 9 that provide at least one through-opening in the core material, in particular by punching, provide this through-opening in the first subregion of the core material, for example by drilling the core material. This also applies to forming the second subregion. Moreover, as described in FIGS. 1 to 9, the glass plug 6 with the metal pin can be inserted into the first sub-region or the second sub-region. While all the exemplary embodiments described above describe a metal anchor bushing that includes two metal pins, preferably arranged in parallel, one of which is grounded at the rear of the core, 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 includes only a single metal pin and is held by a pin support. The pin itself includes, for example, a metal ring that forms a ground connection.

  FIG. 11 shows such a mono pin. The pin support 100 includes a metal pin 103, which is preferably embedded in an insulating filler 104 made of glass. Pin support 100 includes a core material 101.1 containing a metal pin 103 and a socket 101.2 with an inner wall panel 101.12. The end of the sealed portion of the metal pin 103 is electrically connected to the core material 101.1 by the bridge 105. The through opening 106 is formed in the core material by, for example, a punching step. Such a through-opening can also be formed in the core material as described in FIGS. As described above, the core material 101.1 can be punched / stamped with the through opening 106. Preferably, the through opening 106 is punched / stamped with the core material 101.1. Particularly preferably, the core material 101.1 forms an integral component with a socket 101.2. The production of an integral component is achieved, for example, by forming the punching / stamping part by punching / stamping in one step, and the socket is obtained by a deep drawing method.

  Preferably, the inner wall panel 101.12 of the socket 101.2 and the free ends of the metal pins 103 are coated. For example, gold is used as the coating material. Preferably, the coating is applied using an electrolytic technique. The coating serves to keep the electrical resistance at the junction 108 between the plug 120 inserted into the socket 101.2 and the inner wall panel 101.12 of the socket 101.2 low.

  In all the embodiments described in FIGS. 1 to 10, the core material 3, which is implemented as a swivel in an embodiment according to the prior art, is replaced with a punched / stamped metal part. In the individual drawings, the individual means for preventing the fixing material from escaping from the core material under pressure are formed on the core material 3 and the individual means for preventing the metal pins 4 from escaping from the fixing material. Are formed on the metal pin 4, and these means can be used in combination with each other. In this regard, the embodiment is not limited in any way. However, these embodiments aim to improve the strength of the bond between the metal pin 4, the fixing material, and the core material 3, and to ensure the high strength of the metal fixing material bush 1.

  In all the embodiments described in the drawings, the through-openings can have various cross sections. However, preferably a circular cross section is selected. The undercut is formed as an integral component of the core material.

1, 1. x Metal fixing material bush 2 Metal collar 3, 3 x Core material 3 ', 3.2' Core material as a semi-finished product during manufacture 4,4. x Metal pin 5,5. x Metal pin 6,6. x Glass plug 7 First surface 8 Second surface 9 Punching / stamping element 10 Outer periphery 11,11. x Through-opening 11 ', 11.2' Through-opening during manufacture 12,12. x rear part 13,13. x front portion 14 outer periphery 15 inner periphery 16 first subregion 17 second subregion 18 connection surface 20 first subregion 21 second subregion 22 third subregion 23 protrusion 24 surface 25 surface 26 recess 27 protrusion 28 protrusion 29 surface 30 surface 31 protrusion 32 recess 33 opening 34 fixing material 35 means for preventing relative movement between the fixing material and the inner periphery of the through opening 36, 36. x Undercut 37,37. x Protrusion 38 Sheet metal 39 Punching / stamping tool 40 Die 41 Punch / stamp 42 Stamping tool 43 Stamping tool 44 Die 45 First subregion 46 Second subregion 100 Pin support 101.1 Core material 101.2 Core material socket 101. 21 Socket inner wall panel 103 Metal pin 105 Bridge 106 Through-opening 108 Joint point 120 Plugs d ₁ , d ₂ , d ₃ diameter d _1.3 , d _2.3 diameter ld ₁ length ld ₂ length inserted into the socket Ld _1.3 length ld _2.3 length

Claims (43)

A metal fixing material bush, such as a glass-to-metal bush, for an igniter of an air bag or belt tension pulley,
Comprising at least one metal pin disposed through a fixing member in a slot in the core material, wherein the core material has a front part and a rear part,
The core material is formed by one element and the shape of the core material defining the slot is created by at least one other process;
Means for preventing relative movement of the fixing member in the direction of the rear part facing the inner periphery of the slot is provided between the front part and the rear part of the core;
Metal fixing material bush consisting of characterized by.   The metal fixing material bush according to claim 1, wherein a contour defining a final shape is created by the another processing.   3. Metal bushing according to claim 1 or 2, characterized in that said means are an integral component of said core material or form a structural unit with these means.   The metal fixing material bush according to any one of claims 1 to 3, wherein the metal fixing material bush comprises at least two metal pins arranged in parallel to each other.   5. The metal fixing material bush according to claim 1, wherein the metal pin is firmly 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 fixing material bush according to claim 1, wherein a glass plug made of molten glass or high performance polymer is used as the fixing material.   The means for preventing relative movement of the fixing material in the direction of the rear facing the inner periphery of the slot, as viewed from the rear, the means on the inner periphery of the slot in the core; The metal fixing material 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.   The metal fixing material bush according to claim 8, wherein the undercut is formed by at least one protrusion. The slot is characterized by two subregions, a first subregion extending from the rear toward the front and a second subregion extending from the front toward the rear. And
The protrusion is formed by the second subregion characterized by an inner dimension smaller than the first subregion;
The first and second sub-regions have an invariant shape with a constant inner dimension over their length;
The metal fixing material bush according to claim 9, characterized in that: The slot is characterized by two subregions, a first subregion extending from the rear toward the front and a second subregion extending from the front toward the rear. And
The protrusion is formed by the second subregion characterized by an inner dimension smaller than the first subregion;
The first and / or second subregions having a variable shape and / or different inner dimensions over their length;
The metal fixing material bush according to claim 9, characterized in that:   The metal fixing material bush according to claim 11, wherein the first sub-region is characterized by a reduction in dimensions from the front part to the second sub-region.   13. A metal fastener bushing according to claim 11 or 12, characterized in that the slot also represents a circular cross section, at least the first subregion, more preferably the tapered second subregion.   The metal fixing material bush according to claim 8 or 9, wherein the undercut is arranged in the center. Undercutting in both directions,
A first sub-region extending from the rear portion toward the front portion; a second sub-region adjacent to the first sub-region; and a third portion extending from the front portion toward the rear portion. Characterized by three subregions with subregions,
The second subregion is characterized by a smaller dimension than the first and third subregions;
The metal fixing material bush according to claim 8, 9, or 14. Undercutting in both directions,
A first sub-region extending from the rear portion toward the front portion; a second sub-region adjacent to the first sub-region; and a third portion extending from the front portion toward the rear portion. Characterized by three subregions with subregions,
The second subregion is characterized by a larger dimension of the slot than the first and third subregions;
The metal fixing material bush according to claim 8, 9, or 14.   17. A metal fastener bushing according to claim 15 or 16, characterized in that the first and third subregions are characterized by equal cross-sectional dimensions.   18. The method according to claim 9, wherein a plurality of protrusions are provided on the common length between the front portion and the rear portion and arranged in a circumferential direction so as to be separated from each other. The metal fixing material bush according to one item.   The metal fixing material bush according to any one of claims 1 to 18, wherein the slot has a circular cross section.   19. Metal fastener bushing according to any one of the preceding claims, characterized in that the slot represents a randomly selectable cross section.   The metal fixing material bush according to any one of claims 1 to 20, wherein the core material is formed of a stamped metal part.   The metal fixing material bush according to claim 21, wherein the stamped metal part is polished.   The means for preventing relative movement of the fixing material in the direction of the rear facing the inner circumference of the slot is at least one deterministic between the fixing material plug and a part of the slot; The metal fixing material bush according to any one of claims 1 to 22, characterized in that the metal fixing material bush includes any connection.   9. The method of claim 1, wherein the means includes an element inserted into the slot, and the inner circumference of the slot and / or the outer circumference of the element represents a roughness of ≧ 10 μm. The metal fixing material bush according to any one of the above.   25. A means according to any one of claims 1 to 24, characterized in that means are provided on the metal pin to prevent relative movement of the metal pin facing the fixing material. Metal fixing material bush.   16. The means of claim 15, wherein the means for preventing relative movement of the metal pin opposite the fixing material includes at least one radial protrusion on the metal pin. Metal fixing material bush.   27. The metal fixing material bush according to claim 26, wherein the protrusion is an integral component of the metal pin.   27. The metal fixing material 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 securing member includes a number of radial protrusions axially adjacent on the metal pin. The metal fixing material bush according to any one of thru 28.   The metal fixing material bush according to any one of claims 1 to 29, wherein at least two metal pins are provided.   The metal fixing material bush according to claim 30, wherein the two or more metal pins are arranged in parallel to each other.   The metal fixing material bush according to any one of claims 30 and 31, wherein the second metal pin is grounded at the rear portion of the core member.   30. A metal pin according to claim 1, characterized in that a metal pin is provided, which is arranged in the slot in the core material via a fixing and is accompanied by a grounded socket of the core material. Metal fixing material bush as described in any one of Claims. A method for producing a core material for a metal bush according to any one of claims 1 to 33, comprising:
From one part with a predefined thickness, especially sheet metal parts, the final contour that defines the outer shape is obtained by another process,
A method comprising forming a slot for at least one metal pin, wherein a basic shape defining the starting form of the slot is obtained, in particular, by punching the part, such as 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 created in one processing step in the form of punching with a tool. 35. The method of claim 34, wherein:   36. A method according to claim 34 or 35, wherein the undercut in the slot is formed by deformation of the slot.   The method according to claim 36, characterized in that the deformation is achieved by at least one stamping operation.   38. A method according to claim 36 or 37, characterized in that the stamping and punching operations are performed from the same face of the core.   38. A method according to claim 36 or 37, characterized in that the stamping and punching operations are carried out from different faces of the core material.   40. A method according to any one of claims 36 to 39, characterized in that the stamping and punching operations are carried out from both sides of the core material.   41. Method according to claim 40, characterized in that either different tools with the same parameters or the same tool are used for stamping and punching.   42. Any of the claims 34 to 41, characterized in that a stamping operation is performed prior to the punching (punching) of the slot in the area of the slot to be created on the sheet metal part. The method according to claim 1.   43. Method according to any one of claims 34 to 42, characterized in that the socket of the core material is obtained after punching by a deep drawing method.