MATERIAL FEEDER, MATERIAL FEEDING METHOD, AND OPERATING METHOD OF METAL INJECTION MOLDING MACHINE

• Main Authors: NOMOTO YOSHITO, MADARAME HIROKAZU, HIRAYAMA TOMOYA
• Format: Patent
• Language: English
• Published: 18.02.2003
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; PERFORMING OPERATIONS; POWDER METALLURGY; 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

PROBLEM TO BE SOLVED: To prevent defective forming, defective plasticization, and increase in the rotational load pressure of an injection screw in the starting condition and during the steady state operation of a metal injection molding machine. SOLUTION: A load detector 20 is provided in a material feeding machine 18, the load detector 20 intermittently measures the material weight WPre in a hopper 10 before the feeding operation and the material weight WPos in the hopper after the feeding operation to calculate the actually fed material weight WM, the number of rotation of a motor 14 is reduced if the set feed weight WM is larger than the preset feed weight WS, and the number of rotation of the motor 14 is increased if the set feed weight WM is less than the preset weight WS for each feeding operation. The preset feed weight WS is corrected based on the cylinder temperature TM, the injection pressure and the shot weight WInj in the starting condition of the metal injection molding machine, and based on the cylinder temperature TM during the steady state operation.