TAILIEUCHUNG - Future Manufacturing Systems Part 2

Tham khảo tài liệu 'future manufacturing systems part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Flexible manufacturing system hardware components 13 1. Coordinate Measuring Machine The most obvious type of inspection equipments is coordinate measuring machine CMM . This machine can be programmed to probe a piece part and identify depth of holes flatness of surfaces and perpendicularity. Fig. 17. A Large Scale CMM Special requirements usually include constant temperature congruity environment and piece part. Also because of the slow movements necessary to precisely measure surfaces the inspection time is usually long compared to machining time. 2. Probing Machining Centers Probe marching centers are also used as for inspection purposes in addition to CMM station. These machines inspect equipment in work centers by inserting a probe into the gripper or spindle and then moving the probe contacting the work piece or fixture. 14 Future Manufacturing Systems Fig. 18. Example of on-machine checking and inspection Programmable Logic Controllers PLC s A programmable logic controller PLC is a microcomputer-based controller that uses stored instructions in programmable memory to implement logic sequencing timing counting and arithmetic functions through digital or analog input output I O module for controlling machines and processes. PLC is universally called Work Horse of industrial automations. Various systems like material handling system material storage system load unloading stations etc. are programmed through PLC in order to streamline the operations in a flexible manufacturing system. PLCs consist of input modules or points a central processing unit CPU and output modules or points. The basic components of PLC are the followings Processor Memory unit Power supply I O module Programming device These components are housed in a suitable cabinet for the industrial environment. The processor is the central processing unit of the programmable controller. It execute various logic and sequencing functions by operating on the PLC input to determine the appropriate output

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