THICKNESS CONTROLLING ROUND DIE

• Main Author: NINOMIYA NOBUO
• Format: Patent
• Language: English
• Published: 24.09.1991
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; 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 thickness accuracy by eliminating a tendency to grow larger and heavier by preventing a permanent deformation, by a method wherein an actuator, which is confronted with a part having a large lip gap, and actuators on the circumference of the actuator are drawn in by an appropriate quantity by a large number of piezoelectric element actuators provided on an outer circumferential side of an annular lip and the actuators on sides confronting respectively with those are regulated by extruding them by an appropriate quantity. CONSTITUTION:A die mandrel 2 having a resin inlet 1 and an annular lip 3 which is on the outside of the die mandrel 2 and comprised of a rigid body of making a microscopic movement in a vertical direction with a flowing direction of resin are provided, to the outer circumferential side of which a large number of piezoelectric element actuators 5 are fitted by arranging them radially in a circumferential direction of the lip 3. Data measured by a thickness gauge 12 is operation-treated by a CPU 14 and applied to actuators 5 each by changing into a voltage signal through a direct current voltage generator 15. The lip gap is adjusted by a method wherein the actuator confronted with a part whose lip gap is large and the actuator on the circumference of the foregoing actuator are drawn in by an appropriate quantity and the actuators on the respective confronting sides with those are pushed out by an appropriate quantity.