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Drawing was one of the most commonly using method of metal pressure processing. Drawing was a metal material to having a cross-sectional werea, the force under the action of the external force through the die hole, section dimensions narrows gradually,to obtain the required of shape and size. According to the section type of metal materials, drawing into the drawing wire, pipe, profile. Metal to plastic drawing was the use of metal has, by means of external force so that the metal material to produce permanent deformation was not broken, to gain the required shape, size, and to meet the mechanical property and quality requirements of the national standard or standard. The design uses the thread steel bar drawing machine because the thread reinforced metal by drawing output low consumption, through two ribbed roller drawing out the thread steel products of good quality, tool costs low, relatively simple equipment, production flexibility was relatively large, and cold compwered to higher productivity.
Because of the different metal microstructure and chemical composition, the metal can bear the pulling force of different sizes. The drawing theory aims to in-depth study of different structure and composition of metal produced in the process of drawing deformation and stress dwastribution features; it causes of uneven deformation during drawing the consequences; residual stress; effect of drawing conditions on the mechanical properties of drawing products; drawing force and drawing machine power calculation method. In order to make full use of the metal plasticity, determination of drawing process was reasonable, correct choice of drawing equipment, provide the necessary theoretical baswas for drawing production, improve the production quality, reduce the production cost, improve the production efficiency purpose.
Keywords: cold drawing; screw-thread steel ; pressure processing
录
1文献综述
1.1 前言 5
1.2螺纹钢筋国内外技术发展趋势及展望 5
1.3现有设备 6
1.4螺纹钢筋生产新技术 7
1.5本设计目的及意义 8
2工艺方案说明 9
2.1 产品技术要求 9
2.2 主要设备参数 10
2.3 工艺流程 11
2.4 加工技术难点及要点 11
3工艺制度制定 13
3.1 变形制度 13
3.2 润滑制度 14
3.3 酸洗制度 16
3.4 精整工艺制度 17
4冷拔工艺计算机模拟 19
4.1建立模型 19
4.2前处理操作 21
4.3后处理操作 22
4.4数据分析 23
5 模具设计 27
5.1辊形设计 27
5.2夹头设计 28
6 工艺可行性分析 29
6.1各设备能力校核 29
7 产品质量控制 30
7.1螺纹钢筋使用质量要求 30
7.2产品缺陷分类和原因 31
8 产量计算和技术经济指标 33
8.1产量计算 33
8.2综合技术经济指标 33
9 辞谢 34
10 参考文献 35,3886
1文献综述
1.1前言
拉拔是金属压力加工的常用方法之一。拉拔是将具有一定横断面积的金属材料，在外 加拉力作用下，强行通过断面尺寸逐渐缩小的模孔，获得所要求的截面形状和尺寸。按金属材料的断面类型，拉拔分为线材、管材、型材的拉拔。金属所以能够进行拉拔就是利用金属具有的塑性，即借助外力的作用使金属材料产生永久变形不破裂，从而获得所需要的形状、尺寸，且满足国标或部标规定的力学性能和质量的要求。
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