The Transformation Of T6112Horizontal Boring Machine With PLC

T6112boring machine which is a domestic machine was introduced by Shenyang Blower Works Group Co., Ltd.(Hereinafter referred to as SBW) in1980s. The machine is widely used for all kinds of work pieces, especially for the drilling, broaching, boring, reaming, milling and boring flat surface and other jobs of the body and the stand. The machine has fixed facing head radial tool post. It can bore large flat surface, and can also do some milling work.The machine has been operated for many years. Although the aging of some electrical components is serious, and accidents happen frequently, the mechanical structure is kept well, and it has the potential and value to be transformed. So SBW puts this machine into its transformation list, and intends to transform the machine’s electric control system.The main content of this subject is to study the transforming design of the machine’s PLC and the closed-loop control of supply institutions. Firstly it introduces the background and significance of this machine’s transformation, analyzes the working and the electrical control principle of T6112horizontal boring machine, and dictates the working principle of PLC and its application situation and developing trend in the future in electric control, and then about the transforming and upgrading of the electric control system according to the control principle. According to the input and output points of the machine, select PLC host of Siemens S7-200-CPU226type, design the I/O connector and the I/O address distribution, analyze the control logic of all parts, draw the working flow chart, and work out PLC program. For the improvement of the machine’s accuracy, set position measurement organization in the supply institutions, design the closed-loop system and controller, and form position supply all-closed-loop control.Through the transformation of T6112boring machine, in the case that the original operating mode and the main circuit are not changed, the working accuracy is improved, the control circuit is simplified, and at the same time, the failure rate of the machine is also reduced; the production equipment performance is improved; and the cost of hardware investment is saved compared to buying a new one.