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11月5日,中国中冶所属中国二十二冶集团申请的发明专利“小角度全弯管长相贯节点制作方法”获国家知识产权局授权。传统小角度全弯管的复杂节点往往采用铸钢节点,不但造价高、自重大而且铸造工艺复杂,相贯线传统样板多采用手工画制在油毡或薄铁皮上,画制时间长、精度低。采用圆周等分素线法绘制相贯线的传统放样法不再适用,对于弯扭空间构件无法准确描述和绘制。尤其是,现行规范对主、次直管相交间轴线夹角θ<15°的相贯节点焊接坡口与焊接形式未能描
November 5, China Metallurgical belongs to China 22 Steel Group applied for invention patents “small angle elbows long intersecting node production method ” authorized by the State Intellectual Property Office. Traditional small-angle full-bend pipe joints often use steel nodes, not only high cost, heavy weight and the casting process is complex, the traditional pattern of intersecting lines and more use of hand-painted in linoleum or thin metal skin, painting a long time, low accuracy . The traditional method of staking out the intersecting lines by the circumferential bisecting line method is no longer applicable, so it is impossible to accurately describe and draw the components of the bending-torsion space. In particular, the current norms of the intersection of the main and the second straight tube intersection angle θ <15 ° of the intersection of the welding groove and welding form can not be described