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robotics Designing the Mechanisms for Automated Machinery Part 2

Tham khảo tài liệu 'robotics designing the mechanisms for automated machinery part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1.4 Structure of Automatic Industrial Systems 25 FIGURE 1.26 Layout of a continuous tablet manufacturing process. lowing way. At some point one of the cylindrical openings 5 is filled with the required amount of powder for the production of one tablet. This process is carried out by means of the movement of the rotor. Then the upper plungers begin to descend while the lower plungers create the bottom of the pressing die. When the pressing of the tablet 6 is finished both plungers continue their downward movement to push the finished product out of the die in position 7. All these movements of plungers take place while the rotor is in motion. We can also imagine an intermediate case. This case is illustrated by the example of a drilling operation shown schematically in Figure 1.27. The rotor 1 which rotates with a speed V is provided with pockets 2 in which the blanks 3 are automatically TEAM LRN FIGURE 1.27 Layout of a pseudo-continuous drilling process. 26 Introduction Brief Historical Review and Main Definitions placed. The drilling head 4 which can be considered as a two-degrees-of-freedom manipulator carries out a complex movement. The horizontal component of this movement is equal to the rotor s speed V on the section a-b-c-d. The vertical component is made up as follows fast approach of the drill to the blank on the section a-b the drill s auxiliary stroke drilling speed on the section b-c processing stroke and high-speed extraction of the drill on the section c-d second auxiliary stroke . As soon as the second auxiliary stroke has been completed the opening in the blank has been processed and the drill must return to the initial point a to meet the next blank and begin the processing style. The time of one cycle is T L V 1.91 where L is the linear distance between the pockets. The time t that the drilling head follows the rotor can be calculated from the obvious expression t l v 1-10 where I is the distance through which the drilling head follows the rotor.