Patent application number | Description | Published |
20080197521 | METHOD OF INDICATING AN OPEN/CLOSE STATE OF A CHECK VALVE OF AN INJECTION MOLDING MACHINE - A method of indicating an open/close state of a check valve of an injection molding machine simply and more accurately. The method detects screw rotational force during injection and displays in wave form on the screen of a display device changes in detected rotational force. An open/close state of the check valve can be indicated based on the waveform pattern displayed on the display screen because the screw rotational force waveform pattern changes when the check valve closes. From the fact that the screw rotational force waveform pattern changes when the check valve closes, the open/close state of the check valve can be indicated from the displayed waveform. | 08-21-2008 |
20080305199 | INJECTION MOLDING MACHINE AND METHOD FOR DETERMINING CLOSURE OF CHECK RING - Torques and resin pressures applied to a screw are detected during the forward movement of the screw and coefficients of correlation between the detected torques and resin pressures are calculated. When the check ring is open, the flight of the screw receives resin pressure, and the screw torque increases proportionally to the resin pressure due to resin backflow, so the coefficients of correlation between the screw torques and the resin pressures are higher than a reference value. When the check ring closes, the flight of the screw no longer receive resin pressure, so the screw torque decreases and the coefficients of correlation become lower than the reference value. The check ring is determined to be closed when the coefficients of correlation become lower than the reference value. | 12-11-2008 |
20080305202 | INJECTION MOLDING MACHINE - An injection molding machine estimates a check valve wear amount, making it possible to predict a check valve use limit. At start of injection, the check valve is at a position advanced a stroke S | 12-11-2008 |
20080317897 | NOZZLE DEVICE OF INJECTION MOLDING MACHINE - An injection molding machine nozzle capable of letting heat escape from a nozzle end portion and preventing the occurrence of cobwebbing with a simple structure. A heat conducting member is mounted on the nozzle end portion. When the end of the nozzle is contacted against a mold the heat conducting member also contacts the mold. The heat conducting member is composed of the material having heat conductivity equal to or greater than that of the nozzle. The heat of the nozzle end portion is conducted to the heat conducting member and released at the mold, thus preferentially cooling only melted resin of the nozzle end portion. Cobwebbing does not occur even when the mold is opened and the molded article is removed because the melted resin of the muzzle end portion has been cooled. | 12-25-2008 |
20090022838 | INJECTION MOLDING MACHINE - When a screw equipped with a check ring is moved forward, torque acting on the screw is detected, and whether the check ring is closed is determined on the basis of the detected torque. The screw is rotated in reverse when the check ring is determined not to be closed, and the reverse rotation of the screw is stopped when the check ring is determined to be closed. The reverse rotation of the screw is thereby controlled so that the screw is rotated in reverse by an optimal amount for reliably closing the check ring. | 01-22-2009 |
20090022839 | INJECTION MOLDING MACHINE WHICH CARRIES OUT CONTROLLING OF CLOSING OPERATION OF A CHECK RING - While a check ring of a screw of an injection molding machine is in open state, an absolute value (|Δ resin pressure / Δ rotation amount |) of a variation of a resin pressure per unit variation of the screw reverse rotation becomes greater than a predetermined reference value. However, after the check ring is closed, |Δ resin pressure / Δ rotation amount | becomes equal to or less than the reference value. From this, detecting if the |Δ resin pressure / Δ rotation amount | during reverse rotation of the screw, it is possible to determine that the check ring is closed or not. As a result, it is possible to obtain a screw reverse rotation amount which is optimal for reliably closing the check ring. | 01-22-2009 |
20090026646 | INJECTION MOLDING MACHINE, AND METHOD FOR ADJUSTING A REVERSE ROTATION AMOUNT OF A REVERSE ROTATION PROCESS IN AN INJECTION MOLDING MACHINE - When a resin passage of a check ring is opened, resin backflow occurs during time when an injection screw is moved forward, and a reverse rotational force is applied to the screw by resin backflow. On the other hand, when the resin passage is closed, there is no resin backflow and the reverse rotational force applied to the screw is greatly reduced. Consequently, after completion of metering process and before injection process, the screw is moved forward after the screw has been rotated in reverse a predetermined amount to prevent resin backflow. At this time, a maximum value of the reverse rotational force applied to the screw is detected. Until the detected maximum reverse rotational force reaches a reference value or less, the reverse rotation amount is increased sequentially and respective molding cycles are carried out. When the detected maximum reverse rotational force reaches the reference value or less (passage closure), the reverse rotation amount at this time is set as the reverse rotation amount for the reverse rotation process. By means of this operation, an optimal reverse rotation amount can be adjusted automatically. | 01-29-2009 |
20090053349 | INJECTION MOLDING MACHINE HAVING FUNCTION FOR MONITORING SCREW ROTATING TORQUES - Screw rotation speeds and screw rotating torques are measured at predetermined time intervals during metering and substituted into a previously-assumed function to determine a maximum screw rotating torque at each screw rotation speed. An allowable upper limit of screw rotating torque is set for each screw rotation speed on the basis of the determined maximum screw rotating torque. If a screw rotating torque exceeding the allowable upper limit is detected during metering after the allowable upper limit is set, the screw rotation is stopped or changed. | 02-26-2009 |
20140077410 | MANUFACTURING METHOD AND INJECTION MOLDING SYSTEM FOR MULTI-COLOR MOLDED ARTICLE - An injection molding system is configured to produce a multi-color molded article by simultaneously or sequentially injection-molding resins of a plurality of types by means of a plurality of injection molding machines. An insert mold is mounted in a mold of a first injection molding machine and a primary molded article is molded by this injection molding machine. Thereafter, a robot arm takes out the insert mold, along with the primary molded article, from the mold of the injection molding machine and attaches it to a mold of a second injection molding machine. A two-color molded article is injection-molded by the second injection molding machine and removed as a product. | 03-20-2014 |