摘要:
An injection molding machine includes an injection member that pushes a molding material and an injection drive source that moves the injection member. A control device of the injection molding machine includes an injection control unit that controls a stop process for stopping a movement of the injection member and a holding pressure process for controlling a pressure acting on the molding material from the injection member, a pressure monitoring unit that monitors an actual value of the pressure in the stop process, and a timing setting unit that sets a timing when the stop process is to be switched to the holding pressure process on the basis of the actual value of the pressure in the stop process and a value offset from a set value of the pressure at a time of start of the holding pressure process to a high pressure side by a predetermined amount.
摘要:
The present invention comprises a speed feedback control system for carrying out speed feedback control on the basis of a speed detected value Vd obtained by converting a position detected value Xd obtained from a screw position sensor 4, a pressure feedback control system for carrying out a pressure feedback control on the basis of a pressure detected value Pdb obtained from an injection pressure sensor 6b, and a VP switching control function portion Fc for carrying out switching from a speed control region to a pressure control region Zp when a pressure deviation Ep between a preset pressure set value Ps and the pressure detected value Pdb becomes a preset switching determination value Eps or less and carrying out the switching to the pressure control region Zp after control of a speed command value in the speed control region Zv by a predetermined control pattern Dp at this switching.
摘要:
A velocity-pressure switching and pressure holding device and system for electrically-operated injection molding machines. The switching between closed-loop position control and closed-loop pressure control of a servo motor of an injection molding machine is quickly and smoothly achieved by a switchable loop switch to ensure the optimal control of the velocity-pressure switching during injection filling and pressure holding. Furthermore an adjustable observation value and a speed reducing set up for the injection axle before switching are provided to allow users to perform minor adjustments on the velocity-pressure switching during the slow down of the injection axle. The present invention easily and precisely achieves the optimal velocity-pressure switching parameters to facilitate better pressure holding ability to increase the quality of the plastic products.
摘要:
By providing a V-P switchover point on a time axis display screen as well, waveforms of measured pressures prior and subsequent to V-P switchover shall be continuously displayed, thereby making it easy to ascertain the state of pressures at the V-P switchover point. A time axis display screen 4 for displaying velocities and/or pressures with a horizontal axis as a time scale; and a position axis display screen 5 for displaying velocities and/or pressures with a horizontal axis as a position scale; are provided side by side on a display panel surface along with fields for various numerical values established as molding conditions. A V-P switchover point is displayed as a vertical axis in each of time axis display screen 4 and of the position axis display screen 5. The time axis display screen 4 is divided into a left-hand screen portion 4a and a right-hand screen portion 4b by the vertical axis representing the V-P switchover point; and the state of velocities and pressures subsequent to V-P switchover is continuously displayed as waveforms on time axis display screen, starting at a time prior to V-P switchover.
摘要:
For exactly determining the switchover point when producing plastic injection mouldings, two pressure sensors are arranged successively at intervals in the flow direction of the inflowing material, so that the material reaches them at different points in time, and pressure curves (p.sub.1, p.sub.2) are recorded inside the mould cavity. From the measured pressures, the differential pressure is derived. When passing from volumetric filing to compression, the pressures in the mould cavity (p.sub.1, p.sub.2) undergo an abrupt rise (U1, U2). This is reflected in a steep drop of the differential pressure formed, its gradient experiencing a change of sign (V). This indicates that the switchover point has been reached, at which the filling phase must give way to the holding pressure phase.
摘要:
An adaptive controller is provided for controlling the transition, in an injection molding apparatus, from the injection stage to the packing stage. The controller operates by controlling the velocity of the ram during the injection stage, and controlling the ram pressure during the packing stage. The controller anticipates the transition from the injection stage to the packing stage by monitoring the ratio of pressure to velocity. The divergence of this ratio forecasts the onset of the packing stage. At this time, a pressure relief valve is preset in anticipation of the packing stage, to prevent a pressure spike during the transition period. The flow control valve is held constant during the transition.
摘要:
An injection molding machine that uses a mold and a native controller to operate according to an original mold cycle to mold plastic objects is retrofitted with a retrofit controller; the retrofitted machine uses the mold and the retrofit controller to operate according to a retrofit mold cycle to mold plastic objects.
摘要:
The present invention comprises a speed feedback control system for carrying out speed feedback control on the basis of a speed detected value Vd obtained by converting a position detected value Xd obtained from a screw position sensor 4, a pressure feedback control system for carrying out a pressure feedback control on the basis of a pressure detected value Pdb obtained from an injection pressure sensor 6b, and a VP switching control function portion Fc for carrying out switching from a speed control region to a pressure control region Zp when a pressure deviation Ep between a preset pressure set value Ps and the pressure detected value Pdb becomes a preset switching determination value Eps or less and carrying out the switching to the pressure control region Zp after control of a speed command value in the speed control region Zv by a predetermined control pattern Dp at this switching.
摘要:
The invention relates to a method of filling the cavity of a tool used for production of a molded part from a melt, especially the cavity of an injection molding machine, which is characterized in that the melt is introduced into the cavity under pressure and is subjected to a dwell pressure towards the end or at the end of its flow path. The tool wall temperature is determined at the end of the flow path of the melt and the switching point for switching to the dwell pressure is determined from the increase of said temperature.
摘要:
The invention relates to an industrial data transmission system for the registering of process parameters in a periodic bus cycle with a fixed time frame, a synchronizing signal within each cycle having the effect in each case that a multiplicity of process parameters are simultaneously registered and recorded and, in a subsequent data exchange phase, are transmitted to the open-loop and/or closed-loop process control system. In this system, all the time-critical process input and output parameters are registered simultaneously. In a subsequent open-loop and/or closed-loop process control phase, a processing of the high-priority process data takes place. These data are used in particular for plastics injection-molding machines for detecting the changeover point. Furthermore, use is made of a machine production cycle with bus subcycles, which may respectively have a synchronizing signal and different information contents and/or lengths.