TRANSFER MOLDING EQUIPMENT

• Main Authors: NISHI KUNIHIKO, KANEDA AIZO, SAEKI JUNICHI
• Format: Patent
• Language: English
• Published: 29.08.1988
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; PERFORMING OPERATIONS; SEMICONDUCTOR DEVICES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To improve stability in mass production by reducing generation of voids or unfilling defects, by providing a plunger driving electric circuit possessing closed loop control function. CONSTITUTION:Resin 11 is cast into a mold by descending a plunger 5 within a pot 2. A running distance of a servomotor 3 is detected by a pulse generator 10 and a primary current imax1 and secondary current imax2 (provided that imax1> imax2) which are to be given to the servomotor 3 and predetermined running distance are set by a driving control part 12. When a descending switch of a plunger is turned ON, speed control of the servomotor 3 is performed and the maximum current of the motor is established on the primary current. When the running distance becomes set one, the maximum current of the motor is set by changing over to the secondary current and when the current of the motor has become this secondary current, the servomotor 3 is made into a system of torque control. A resin enclosed article 11 free from voids or unfilling defects are molded under a state where resin filling is completed, resin pressure is loaded by a predetermined period of time and neither generation of flashes nor deformation of an insert exists.