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2025-05-26 22:20本頁(yè)面
【正文】 eed control, temperature control, fault control and realtime display the whole process such as injection molding a variety of control can greatly improve the quality of plastic products will help enhance economic benefits. Control of the contents of the injection molding machine Injection molding machine process control system mainly consists of two parts: First, the temperature control system in order to right barrel, melt and mold temperature control。 1 ℃ . Precise temperature control in precision injection molding that help improve product quality and availability of raw materials is a very important indicator. In the plastic processing, temperature control include barrel, nozzle and mold temperature control. Barrel temperature of the barrel surface heating temperature, due to relatively thick wall barrel, so the choice of thermocouple detection point is critical, and different test points on the temperature curve is a large difference. Therefore, parallel detection of doublepoint, namely, surface and deep in the barrel at the same time set the thermocouples, will be relatively stable temperature curve is conducive to temperature control accuracy. Nozzle melt temperature directly affects the passage of the shear flow, the quality of the products have a major impact, so the nozzle temperature control 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
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