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EP-3870929-B1 - CONNECTION PIN FOR FEEDTHROUGHS AND PRODUCTION METHOD

EP3870929B1EP 3870929 B1EP3870929 B1EP 3870929B1EP-3870929-B1

Inventors

  • HARTL, HELMUT

Dates

Publication Date
20260513
Application Date
20191018

Claims (14)

  1. Connection pin (1), in particular a metal pin, for feedthroughs, in particular glass-metal feedthroughs (100), having at least one first, elongated, cylindrical section (3) with a diameter D, as well as at least one adjoining end section (7), wherein the end section (7) has a rounding and/or a rounding section with a radius, and the rounding and/or the rounding section has at least the shape of a circular segment with radius R, wherein the radius R is a radius according to a specification, in particular a predetermined specification, and is obtained by means of a cutting process and/or a non-cutting process, and the connection pin (1) has a pin surface, and the pin surface in the cylindrical section, in particular the entire pin surface, is largely free or as far as possible free or free of impurities consisting of vibratory grinding particles, preferably of Al 2 O 3 , SiC, wherein the radius R of the rounding and/or the rounding section is in the range of 0.4D to 0.65D, and wherein the end section has an end face F, the surface of which is arranged substantially perpendicular to the pin axis A, and to which the rounding section with radius R adjoins and forms the transition to the outer circumferential surface of the cylindrical section (3), wherein the end face (F) has a diameter of less than 0.4 mm and wherein the connection pin has a closed surface coating.
  2. Connection pin according to claim 1, characterized in that the radius R of the rounding and/or the rounding section is in the range of 0.45-D to 0.55-D, preferably approximately half the diameter D of the cylindrical region.
  3. Connection pin (1) according to claim 1 or 2, characterized in that the end face (F) has a diameter of less than 0.3 mm, in particular with a diameter D of 1.0 mm ± 0.1 mm.
  4. Connection pin according to one of claims 1 to 3, characterized in that the non-cutting process comprises forming processes, in particular upsetting, rolling, stamping, pressing, squeezing, hammering.
  5. Connection pin according to one of claims 1 to 3, characterized in that the cutting process comprises turning, milling, grinding.
  6. Connection pin according to one of claims 1 to 5, characterized in that less than 2%, in particular less than 1.5%, preferably less than 1%, in particular less than 0.5%, preferably less than 0.1% of the total pin surface has impurities consisting of vibratory grinding particles, preferably of Al 2 O 3 , SiC.
  7. Connection pin according to one of claims 1 to 6, characterized in that the pin surface comprises a coating, in particular a nickel coating and/or a gold coating, preferably with a layer thickness in the range of 0.1 µm to 10 µm.
  8. Connection pin according to claim 7, characterized in that the coating is a nickel coating and the layer thickness of the nickel coating is in the range of 2 to 8 µm, preferably 4 to 6 µm, and/or the coating is a gold coating and the layer thickness of the gold coating is in the range of 0.5 to 5 µm, preferably 0.8 to 1.5 µm.
  9. Connection pin according to one of claims 7 to 8, characterized in that the coating is largely free of defects.
  10. Connection pin according to one of claims 1 to 9, characterized in that the radius R is in the range of 0.25 mm to 1.0 mm and/or the diameter D is in the range of 0.5 mm to 2.0 mm.
  11. Feedthrough (100), in particular metal-fixing material feedthroughs, preferably for devices that are exposed to high pressures, having at least one connection pin, characterized in that the connection pin is a connection pin according to one of claims 1 to 10.
  12. Feedthrough according to claim 11, characterized in that the feedthrough (100) comprises an opening (20), wherein the connection pin is preferably guided through the opening (20) in a glass or glass material (60).
  13. Method for manufacturing a connection pin, preferably a metal pin, for a feedthrough, in particular a glass-metal feedthrough, comprising the following steps of: - providing a connection pin blank made of a wire material with at least one end section; - introducing a rounding and/or rounding section with radius R, according to a specification, into the end section of the wire material by means of a cutting and/or non-cutting process, resulting in the rounded end section of the connection pin, wherein - the connection pin (1) has a pin surface and, after the rounding and/or rounding section with radius R has been introduced using a cutting and/or non-cutting process, the pin surface in the cylindrical section, in particular the entire pin surface, is largely free or as far as possible free or free of impurities consisting of vibratory grinding particles, preferably Al 2 O 3 , SiC, and - the radius R of the rounding and/or the rounding section is in the range of 0.4D to 0.65D, wherein D is the diameter of the cylindrical region, and wherein the end section has an end face F whose surface is arranged substantially perpendicular to the pin axis A and to which the rounding section with radius R adjoins and forms the transition to the outer circumferential surface of the cylindrical section (3), wherein the end face (F) has a diameter of less than 0.4 mm; - wherein the connection pin is provided with a closed surface coating after the radius has been produced.
  14. Method according to claim 13, characterized in that the connection pin is provided with a coating that is largely free of defects, preferably a nickel and/or gold coating.

Description

The invention relates to a connecting pin, in particular a metal pin, preferably for a feedthrough, in particular a metal fixing material feedthrough, preferably for devices that are exposed to high pressures, preferably igniters of airbags or belt tensioners, a feedthrough with such a connecting pin and a method for manufacturing such a connecting pin. Connecting pins for feedthroughs, especially metal-fixing material feedthroughs, are available in various designs from the state of the art, e.g. AT 513 238 B1 , previously known. Metal-fixation feedthroughs are vacuum-tight fusions of fixation materials, particularly glass, glass-ceramics, or plastics, within metals. The metals act as electrical conductors. An example of this is... US-A-5,345,872 , US-A-3,274,937 Reference is made to feedthroughs of this type. Such feedthroughs are widely used in electronics and electrical engineering. The material used for fusion, particularly glass, serves as an insulator. Typical metal-fixed-material feedthroughs are constructed such that metallic inner conductors are fused into a pre-formed sintered glass part, with the sintered glass part or glass tube being fused into an outer metal part containing the so-called base body, which is formed from a ring- or plate-shaped element. Preferred applications for such metal-fixed-material feedthroughs include, for example, ignition devices. These are used, among other things, for airbags or seatbelt tensioners in motor vehicles. In this case, the metal-fixed-material feedthroughs are part of an ignition device. The complete ignition device comprises, in addition to the metal-fixed-material feedthrough, an ignition bridge, the explosive, and a metal cover that tightly encloses the ignition mechanism. Either one, two, or more than two connecting pins, particularly metallic pins, can pass through the feedthrough. through which the cable is passed. In a particularly preferred embodiment with a metallic pin, the housing is grounded; in a preferred two-pole embodiment, it rests on one of the pins. From the US 2006/0222881 A1 , the US 2004/0216631 , the EP-A-1 455 160 , the US 2007/0187934 A1 as well as the US-A-1 813 906 Metal fixing material feedthroughs, particularly for airbag igniters or seatbelt tensioners, are known, characterized by the fact that the through-hole for the connecting pins, especially the metal pins, is punched out of the base body. During the manufacture of the base bodies, according to the US 2007/0187934 A1 from a strip material with a thickness in the range between 1 mm and 5 mm, preferably 1.5 mm and 3.5 mm, in particular between 1.8 mm and 3.0 mm, most preferably between 2.0 mm and 2.6 mm, the openings are driven through the entire thickness of the base body by means of the punching process. The connecting pin, in particular the metal pin in the fixing material, is inserted or glazed into the entrance opening punched into the base body over the entire thickness of the base body, which lies in the area mentioned above. Furthermore, the through-hole in the bushings with more than one pin must comply with the US 2007/0187934 A1 arranged off-center. Punching out a sheet metal material according to the US 2007/0187934 A1 It has a number of disadvantages. One disadvantage is that stamping from a strip material, for example a sheet of the base body, produces a large amount of material waste. From the DE 10 2006 056077 A1 An ignition device for a pyrotechnic protective device has become known, comprising a sheath for fixing the position of the current passage of the metal pin and means for preventing relative movement between the sheath and the metal pin. As in the case of the US 2007/0187934A1 will also be used in the DE 10 2006 056 077 A1 The basic body is stamped from a sheet of metal, for example, from strip material, resulting in a large amount of material waste. Furthermore, as in the US 2007/0187934A1 the through-openings are arranged off-axis. The EP 1 491 848 A1 The diagram shows a current feedthrough with a centrally located opening for a pin-shaped conductor. The manufacturing process of the opening is not described, and it extends across the entire thickness of the base body. From the US 8,978,557 B2 A ring-shaped, plate-shaped element for a seatbelt tensioner and/or airbag igniter has become known, featuring a clearance area where the through-hole is created by punching. The feedthrough component with the ring-shaped, plate-shaped element comprises two metal pins, wherein in the US 8,978,557 B2 No information is given about how the metal pins are manufactured. The DE 10 2017 123 278 A1 The figure shows a base body for feedthrough elements comprising a metallic base body, at least one through-opening for receiving a functional element in a fixing material, particularly an electrically insulating one, and at least one conductor electrically connected to the base body by a solder joint. The solder joint comprises a metallic solder material, wherein the m