Electric injection molding machine and method for controlling injection of electric injection molding machine
First Claim
1. An electric injection molding machine comprising:
- an electric injection mechanism for injecting a molding material into a mold by a drive force of an electric motor, a servo control means for controlling said injection motor so that an injection speed follows an injection speed reference based on predetermined molding conditions, and a compensating means for compensating said injection speed reference based on characteristics of a hydraulic drive system so that fluctuation characteristics of the injection speed with respect to the injection pressure when controlling the drive of said electric injection mechanism according to said molding conditions approximate the fluctuation characteristics of the injection speed with respect to the injection pressure in a hydraulic injection mechanism for injecting a molding material into a mold by the hydraulic drive system.
1 Assignment
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Accused Products
Abstract
An electric injection molding machine capable of maintaining a quality of molded articles and capable of suppressing a variation of weight of articles molded by a mold having a plurality of cavities when transferring molding conditions in a hydraulic injection molding machine as they are to the electric injection molding machine. This electric injection molding machine has an electric injection mechanism for injecting a molding material into a mold by a drive force of an electric motor, an injection control unit and a servo driver for controlling the injection motor so as to follow the injection speed reference, and an reference compensation unit for compensating the injection speed reference based on the characteristics of the hydraulic drive system so that fluctuation characteristics of the injection speed with respect to the injection pressure when controlling the electric injection mechanism approximate the fluctuation characteristics of the injection speed with respect to the injection pressure in the hydraulic injection mechanism performing the injection of the molding material to the mold by the hydraulic drive system.
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Citations
8 Claims
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1. An electric injection molding machine comprising:
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an electric injection mechanism for injecting a molding material into a mold by a drive force of an electric motor, a servo control means for controlling said injection motor so that an injection speed follows an injection speed reference based on predetermined molding conditions, and a compensating means for compensating said injection speed reference based on characteristics of a hydraulic drive system so that fluctuation characteristics of the injection speed with respect to the injection pressure when controlling the drive of said electric injection mechanism according to said molding conditions approximate the fluctuation characteristics of the injection speed with respect to the injection pressure in a hydraulic injection mechanism for injecting a molding material into a mold by the hydraulic drive system. - View Dependent Claims (2, 3, 4)
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5. A method for controlling the injection of an electric injection molding machine comprising:
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a control step for servo control of a drive motor so that an electric injection mechanism for injecting a molding material into a mold by a drive force of an electric motor follows an injection speed reference based on predetermined molding conditions and a compensation step for compensating said injection speed reference based on characteristics of a hydraulic drive system so that fluctuation characteristics of the injection speed with respect to the injection pressure generated in said electric injection mechanism during servo control of the electric motor approximate the fluctuation characteristics of the injection speed with respect to the injection pressure in a hydraulic injection mechanism for injecting a molding material into a mold by the hydraulic drive system. - View Dependent Claims (6, 7, 8)
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Specification