钢筋冷挤压机主要有镦粗直螺纹衔接接头和滚压直螺纹衔接接头。这两种工艺采用不同的加工方法,加强钢筋端头螺纹的承载能力,到达接头与钢筋母材等强的意图。镦粗直螺纹衔接接头:经过钢筋端头镦粗后制造的直螺纹和衔接件螺纹咬合构成的接头。
苏州钢筋冷挤压机施工质量的检查方法有几种?
其工艺是:先将钢筋端头经过镦粗设备镦粗,再加工出螺纹,其螺纹小径不小于钢筋母材直径,使接头与母材到达等强。国外镦粗直螺纹衔接接头,其钢筋端头有热镦粗又有冷镦粗。热镦粗主要是消除镦粗过程中发生的内应力,但加热设备投入费用高。
我国的镦粗直螺纹衔接接头,其钢筋端头主要是冷镦粗,对钢筋的延性要求高,对延性较低的钢筋,镦粗质量较难操控,易发生脆断现象。钢筋冷挤压机接头形式多样,在力学功能上也是有差异的,依据力学功能按其承受能力分类,有利于考虑到结构的重要性、接头在结构中所在方位、接头百分率等不同的使用场合等方面影响合理选用接头类型。
The steel bar end of upsetting straight thread connection joint in China is mainly cold upsetting, which requires high ductility of steel bar. For steel bar with low ductility, the upsetting quality is difficult to control and brittle fracture is easy to occur. The joint forms of steel bar cold extruder are diverse, and there are also differences in mechanical functions. According to the classification of mechanical functions according to their bearing capacity, it is helpful to reasonably select the joint type considering the influence of different application occasions such as the importance of the structure, the orientation of the joint in the structure, the joint percentage and so on.
苏州钢筋冷挤压机施工质量的检查方法有几种?

镦粗直螺纹衔接接头其长处是强度高,现场施工速度快,工人劳动强度低,钢筋直螺纹丝头全部提早预制,现场衔接为安装作业。其不足之处在于镦粗过程中易出现镦偏现象,一旦镦偏切掉重镦;镦粗过程中发生内应力,钢筋镦粗部分延性降低,易发生脆断现象,螺纹加工需求两道工序两套设备完结。
滚压直螺纹衔接接头:经过钢筋端头直接滚压或挤(碾)压肋滚压或剥肋后滚压制造的直螺纹和衔接件螺纹咬合构成的接头。其基本原理是利用了金属材料塑性变形后冷作硬化加强金属材料强度的特性,而仅在金属表层发生塑变、冷作硬化,金属内部仍坚持原金属的功能,因而使钢筋接头与母材到达等强。http://www.zjgunsiji.com/

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