Abstract:
A control system for an injection molding machine performs a molding cycle. The molding cycle includes a filling process for controlling an advancing motion of a screw of the injection molding machine, and a hold press process for controlling a pressure of a molten resin after the filling process. The control system includes retracting speed limit means for limiting a retracting speed of the screw to a predetermined retracting speed limit value after a pressure control in the hold press process begins.
Abstract:
A hydraulic mold clamping unit, in particular for an injection molding machines or a press, includes a fixed lower platen and an upper plated which is moved by an open-close mechanism in a vertical direction. The open-close mechanism includes at least one hydraulic cylinder of a first type having a double-acting piston, and at least one hydraulic cylinder of a second type. A hydraulic pump system is operatively connected to both sides of the hydraulic cylinder of first type, and a pressure accumulator is operatively connected to the hydraulic cylinder of second type. in order to realize an energy-efficient operation of the upper platen at little pressure build-up, a proportional or regulation valve is disposed in the pump system for modifying a back pressure in the hydraulic cylinder of first type, when closing the lower and upper platens.
Abstract:
Provided is a molding apparatus for molding simultaneously a plurality of semiconductor devices. The molding apparatus includes a mold, a plurality of plungers, and a plunger block. The mold is prepared to mold a plurality of semiconductor devices. The plurality of plungers are plunged into the mold to inject a molding compound that will encapsulate the semiconductor devices in the mold. The plurality of plungers are assembled with the plunge block to operate at the same time. Each of the plurality of plungers includes a load sensor and/or a contact sensor, so as to sense separately whether the plungers are improperly operating.
Abstract:
A closure position detection mode is provided so as to obtain a rate of variation (which encompasses an amount of variation) in a physical quantity to a predetermined amount of movement of a movable platen or a crosshead, and detect, as a mold closure position, a position when the variation rate reaches a preset ratio. The mold clamping apparatus is previously operated in the closure position detection mode so as to store, as a reference value, the mold closure position at which a target mold clamping force is obtained. In production operation, the mold clamping apparatus is operated in the closure position detection mode so as to obtain an actual mold closure position (detection value). The mold clamping force is corrected on the basis of a deviation of the detection value from the reference value.
Abstract:
An electromechanical clamping device with hydraulic assistance. A thrust mechanism driven by an electric motor displaces two clamping jaws with respect to each other along a guide device. One clamping jaw is divided into two mutually displaceable part java. A chamber to hold pressure medium is formed between the part jaws. The first part jaw can be displaced along the guide device and locked with respect to the latter. One part jaw is provided with a first cylinder coupled to the output of the thrust mechanism. In order to close the clamping device, in a first step the thrust mechanism pulls the part jaws against the other clamping jaw, and in a second step the thrust mechanism delivers pressure medium from the first cylinder into the chamber between the two part jaws, with the first part jaw locked with respect to the guide device. To open the clamping device, in a first step a second cylinder arranged between the two part jaws pulls the part jaws against each other, with the first part jaw locked with respect to the guide device, and then in a second step the thrust mechanism forces the part jaw coupled to it in the opening direction, forcing the other part jaw with it, with the first part jaw unlocked from the guide device. The clamping device is provided for production machines, in particular for injection molding machines.
Abstract:
The invention relates to an electric injecting molder and an injection velocity and injection pressure controlling method for an electric injecting molder, and it is an object of the present invention to make it possible, in injection molding by an electric injection molder, to mold stable resin products having a minimized dispersion in the quality even if the operation environment varies. When an injection screw (23) disposed in an injection cylinder (22) is driven to move in forward and backward directions by an electric motor (29A) to inject resin material (3) in the injection cylinder (22) into a metal mold (1, 2) to fill the metal mold (1, 2), the electric motor (29A) is first velocity-controlled to fill the resin material (3) into the metal mold (1, 2), and, after the filling, the electric motor (29A) is pressure-controlled to replenish the resin material for shrinkage of the resin. Upon the velocity control, a velocity target value for the injection screw (23) is corrected in response to a force detection value so that the velocity target value for the injection screw (23) may decrease as the force detection value increases to perform velocity feedback control of the electric motor (29A) so that a velocity detection value from velocity detection means may be equal to the velocity target value.
Abstract:
The present invention replaces the multiple controller systems by incorporating the controller of sensory devices with the part-forming machine controller (typically a personal computer), thereby producing a synergistic combination. More specifically, sensory devices such as, for exemplary purposes only, cameras, infrared sensors, ultrasonic sensors, or other sensing devices are connected directly to one or more preexisting serial, parallel or USB ports or other bus interfaces of the machine controller. By programming the machine controller or loading software therein, the machine controller can receive the input signal(s)/data from the sensory device, analyze the data, provide an output signal to the sensory device and communicate directly and contemporaneously with the machine controller software.
Abstract:
A temperature regulator main body is connected to a cooling hole formed in a temperature regulating part under a hopper through a tube and comprises a tank for a cooling medium, a pump, a radiator, and a fan facing the radiator to send cold air and driven by a motor. By driving of the pump, the cooling medium circulates between the temperature regulating part under the hopper and the temperature regulator main body. A temperature sensor is provided to the temperature regulating part under the hopper. A controller for controlling an injection molding machine cools the circulating cooling medium by the fan and feedback controls the temperature of the temperature regulating part under the hopper when a temperature detected by the temperature sensor is higher than a preset temperature.
Abstract:
The invention relates to a method and apparatus for analyzing fluid flow while considering heat transfer effects and, in particular, a phase change from a molten state to a solid state. In particular, the method and apparatus may be applied to the analysis of an injection molding process for producing a molded polymer component from a thermoplastic or a thermosetting polymer. In one embodiment, the method may be used to determine pressure required to fill a mold cavity and pressure gradients introduced during filling and packing of the cavity of an injection mold. The results of these analyses may be used to determine the number and location of gates, to determine the best material for the component, and to optimize the process conditions used in the molding process.
Abstract:
An injection molding apparatus and method are provided in which the rate of material flow during an injection cycle is controlled. According to one preferred embodiment, an injection molding apparatus is provided that includes a manifold, at least one injection nozzle coupled to the manifold, an actuator, and a valve pin adapted to reciprocate through the manifold and the injection nozzle. The valve pin has a first end coupled to the actuator, a second end that closes the gate in a forward position, and a control surface intermediate said first and second ends for adjusting the rate of material flow during an injection cycle. Retracting the valve pin tends to decrease the rate of material flow during the injection cycle and displacing the valve pin toward the gate tends to increase the rate of material flow during the injection cycle.