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2023-05-18 22:20:25 本頁(yè)面
【正文】 precision demanding. Mold temperature is in contact with the product mold cavity surface temperature, it will significantly affect the charge membrane, cooling and packing process. For the mold temperature control method can be used control the heat carrier temperature method can also directly control the mold temperature. In the former approach, in order to heat the temperature for the control of the export vector objects, is relatively simple and can meet the general temperature control requirements. When the temperature control precision is high generally use the second method of temperature control. Injection speed, packing pressure, back pressure is the injection of part of the sol to control the first of the three variables directly affect the accuracy of its control product quality. Modern more advanced injection molding machine equipped with 510 multistage injection speed and packing, as well as melt glue back pressure control. Generally through displacement / velocity sensors, pressure sensors, closedloop injection control, and high response servo valves used in conjunction to achieve the process of injection molding melt glue back pressure, injection speed and packing conditions of precise control. Another relatively simple approach is to use closedloop proportional valve, through the proportional valve spool position of their own closedloop control to improve control precision. However, spool position is an intermediate variable, so the control accuracy somewhat less. Transfer mold process control variable is the main clamping force, clamping force and time again is stable and the necessary conditions for forming the cycle. Transfer mode control of the process should be another important variable is location. On the one hand, advanced injection molding machine constant pursuit of efficiency, directly affect the speed of transfer mold molding cycle, and quickly transfer to the deceleration control mode in itself has put forward higher requirements. On the other hand, due to special process of continuous development and promotion of position control precision molds have bee increasingly demanding. PLC and PCC Since the late 20th century, 60 the United States the first programmable logic controller PLC inception, PLC control technology has gone through a 30year development process, especially with modern puter technology and microelectronics technology, it has been in the soft hardware technology is far out of the original sequence control of the prototype stage. Programmable Computer Controller (PCC) is to represent the development trend of this new generation of programmable controllers. PLC pared with conventional, PCC is a for motion control, process control and work control of dedicated control system, is a standard PLC, numerical control systems and industrial performance characteristics of the puter in one of the intelligent controller. PCC is its biggest feature is similar to a large puter timesharing multitasking operating systems and diverse software applications design. Most of the
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