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公开(公告)号：EP1950856B1
公开(公告)日：2014-01-15
申请号：EP07738327.1
申请日：2007-03-12
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公开(公告)号：EP1950856A1
公开(公告)日：2008-07-30
申请号：EP07738327.1
申请日：2007-03-12
摘要： It is an object of the invention to provide a method of producing a spark plug in which, in order to reduce the size of the spark plug, the diameter of a center electrode can be reduced while maintaining the heat dissipation property of the center electrode, and also such a spark plug. A columnar member 220 in which an outer skin member 21 made of a high refractory Ni alloy, and a core member 23 made of a copper alloy having a high thermal conductivity are clad, and which is columnarly extended can be configured by extrusion molding into a state where the thickness of the outer skin member 21 is substantially uniform (extrusion molding step). A flange portion 305 and a tip end portion 301 are formed in the columnar member 220 to obtain an electrode intermediate member 320 (tip end portion/flange portion forming step). In a middle trunk portion 303 of the electrode intermediate member 320, the thickness of the outer skin member 21 is maintained. The surface of the middle trunk portion 303 is cut or polished to reduce the thickness (middle trunk portion processing step), whereby the diameter of a center electrode 20 can be reduced while maintaining the outer diameter of the core member 23.
摘要翻译： 本发明的目的是提供一种制造火花塞的方法，其中为了减小火花塞的尺寸，可以在保持中心电极的散热性的同时减小中心电极的直径， 以及这样的火花塞。 由高耐火Ni合金制成的外皮部件21和由导热系数高的铜合金制成的芯部件23被包覆并且被柱状延伸的柱状部件220可以通过挤压成型而形成 外皮部件21的厚度基本均匀的状态（挤压成型工序）。 在柱状构件220中形成有凸缘部305和前端部301，以获得电极中间构件320（前端部/凸缘部形成工序）。 在电极中间构件320的中间主体部分303中，保持外皮部件21的厚度。 中间主体部分303的表面被切割或抛光以减小厚度（中间部分处理步骤），从而可以在保持芯部件23的外径的同时减小中心电极20的直径。
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