不锈钢丝网缝焊技术研究

发布时间：2018-03-09 21:13

本文选题：不锈钢丝网　切入点：电源控制　出处：《沈阳工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：在液压、机械、石油、化工等行业的液体流动通道中通常需要进行过滤。目前制造过滤装置有很多选择,其中一种典型形式及制造技术是将不锈钢丝网卷成筒体进行缝焊。在焊接成的不锈钢丝网筒体内侧或外侧再加上强度符合要求的不锈钢骨架等机构,使过滤装置达到强度等方面的要求,从而制造成不锈钢丝网过滤装置。为此开发了不锈钢丝网筒体缝焊设备。针对不锈钢丝网筒体缝焊的能量控制要求,设计了专用的缝焊电源控制系统。电源控制系统主要由同步脉冲控制系统、时间控制系统、移相控制系统、脉冲列触发控制系统以及晶闸管开关控制系统等组成。设计的缝焊电源控制系统首先产生50Hz和100Hz的同步脉冲,然后50Hz脉冲控制时间控制系统,100Hz的同步脉冲控制移相和脉冲列产生,触发脉冲列的脉冲宽度为200μs,周期为210μs,最后触发晶闸管控制主焊接变压器进行焊接,并且第一半波总是在控制角为90°时触发。电源控制系统能量采用粗调和微调相结合的调节方式,这种调节方式使焊接能量的控制更精细。针对不锈钢丝网筒体缝焊的工艺要求,设计了专用的机械机构。机械机构主要由气动控制系统、圆盘形滚轮上电极、圆柱形下电极、丝网筒体成形装置以及工作台等组成。设计制造的圆盘滚轮上电极传动系统提供的焊接压力为2.0—3.6 kN,圆柱形下电极和丝网筒体成型夹具保证了焊后的不锈钢丝网筒体符合直径30mm和长500mm的尺寸要求,工作台和伺服进给系统保证了焊接时的速度为200—400 mm/min。该机构焊接操作过程简便、工作也十分可靠,能实现加压、行走以及焊接等操作。采用自主研制的缝焊设备进行了不锈钢丝网筒体的焊接实验,实验对象是丝径和孔径都为0.13mm的不锈钢丝网。实验确定了档位6,热量调节比例67%,加热周波数2,间隙周波数2,焊接压力2.5kN和焊接速度350 mm/min的缝焊工艺参数。实际缝焊表明,焊缝成形良好,能够保证不锈钢丝网筒体的过滤精度,焊接过程运行稳定。缝焊设备及工艺技术在焊接运行时表明,焊接过程及焊接质量稳定。
[Abstract]:In fluid flow channels in hydraulic, mechanical, petroleum, chemical and other industries, filtration is usually required. There are many options for manufacturing filtration devices. One of the typical forms and manufacturing techniques is seam welding of stainless steel wire coiled into a cylinder. Inside or outside the welded stainless steel wire tube is added with a stainless steel skeleton of strength that meets the requirements. In order to make the filter device meet the requirements of strength and other aspects, the stainless steel mesh filter device is manufactured. For this purpose, the stainless steel wire mesh tube seam welding equipment is developed, and the energy control requirements of the stainless steel screen tube seam welding are discussed. A special seam welding power source control system is designed. The power control system is mainly composed of synchronous pulse control system, time control system, phase shift control system, The pulse train trigger control system and the thyristor switch control system, etc. The designed seam welding power source control system first produces synchronous pulses of 50 Hz and 100 Hz. Then the synchronous pulse control phase shift and pulse train of 100Hz pulse control system are generated. The pulse width of the trigger pulse train is 200 渭 s and the period is 210 渭 s. Finally, the main welding transformer is controlled by the thyristor to weld. And the first half of the wave is always triggered when the control angle is 90 掳. The energy of the power control system is regulated by the combination of coarse and fine tuning, which makes the control of welding energy more precise. A special mechanical mechanism is designed. The mechanism is mainly composed of pneumatic control system, disk roller top electrode, cylindrical lower electrode, The welding pressure provided by the electrode transmission system of the disc roller is 2.0-3.6 kN, and the welding pressure of the cylinder bottom electrode and the wire mesh tube forming fixture ensures the stainless steel wire tube after welding. The body meets the size requirements of 30 mm in diameter and 500 mm in length, The worktable and servo feed system guarantee the welding speed of 200-400 mm / min. The welding process of the mechanism is simple and reliable, and it can be pressurized. The welding experiment of stainless steel wire mesh tube was carried out by using the self-developed seam welding equipment. The experimental object is stainless steel wire mesh with both diameter and aperture of 0.13mm. the welding process parameters are determined as gear 6, heat adjustment ratio 67, heating Zhou Bo 2, gap Zhou Bo 2, welding pressure 2.5kN and welding speed 350 mm/min. The welding seam is well formed, which can ensure the filter precision of stainless steel screen tube and the running stability of welding process. The welding equipment and technology show that the welding process and welding quality are stable.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG457.11

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