Patent ID: 6325609
Filing Date: 2001-12-04
Classification: B30B

Abstract:
A compression molding machine for powder material comprising a compressing means which compresses powder material filled between compressing components so as to mold the powder material into a product by making the compressing components approach each other to a predetermined distance, an amount adjusting means which adjusts an amount of the powder material to be filled, a pressure detecting means which detects compressive pressure applied to the powder material by the compressing means, and a basic control means which controls the amount adjusting means so that the compressive pressure detected by the pressure detecting means becomes approximate to a reference value of compressive pressure which has previously been calculated in accordance with the predetermined reference amount of the powder material, further comprisinga measuring means which samples the product automatically and measures weight and thickness of the sampled product,a position adjusting means which adjusts a predetermined distance between the compressing components,a weight control means which is used alternatively to the basic control means to control the amount adjusting means while basic control conducted by the basic control means is interrupted so that the weight of the product measured by the measuring means becomes approximate to a predetermined reference value of weight,a thickness control means which is used alternatively to the basic control means to control the position adjusting means while basic control conducted by the basic control means is interrupted so that the thickness of the product measured by the measuring means becomes approximate to a predetermined reference value of thickness anda reference pressure calibration means which calibrates the reference value of compressive pressure based on pressure measured at a time when both of the measured weight and thickness of the product are within the limits of tolerance set in accordance with the reference value of weight and thickness.