Bottom dead center correction device for servo press machine

A device for correcting a bottom dead center by detecting a molding load in a servo press, said servo press, which has a servo motor with numerical control as a drive source, providing a raising and lowering motion of a slide, comprising:

• (a) a scale detection device, which detects a position of said slide in a vertical direction and which outputs an electrical position signal;
• (b) a current detection device, which detects a load current indicative of molding load supplied to said servo motor;
• an NC control device, which controls a rise and fall motion of said slide by controlling said load current that is supplied to said servo motor so that it corresponds to a pre-set slide motion;
• when a slide load value, which is calculated from said load current inputted from said current detection device, reaches a set slide load value, said NC control device corrects a set bottom dead center of said slide according to a position correction value, which is a difference between the slide position and a set slide position value.

A device for correcting a bottom dead center by detecting a molding load in a servo press, said servo press, which has a servo motor with numerical control as a drive source, providing a raising and lowering motion of a slide, comprising:

• (a) a scale detection device, which detects a position of said slide in a vertical direction and which outputs an electrical position signal;
• (b) a load detection cell which detects a slide load value;
• an NC control device, which controls a rise and fall motion of said slide by controlling said load current that is supplied to said servo motor so that it corresponds to a pre-set slide motion;
• when said slide load value, which is detected by said load detection cell, reaches a set slide load value, said NC control device corrects a set bottom dead center of said slide according to a position correction value, which is a difference between the slide position and a set slide position value.

A device for correcting a bottom dead center by detecting a molding load in a servo press, said servo press, which has a servo motor with numerical control as a drive source, providing a raising and lowering motion of a slide, comprising:

• (a) a scale detection device, which detects a position of said slide in a vertical direction and which outputs an electrical position signal;
• (b) a current detection device, which detects a load current indicative of molding load supplied to said servo motor;
• an NC control device, which controls a rise and fall motion of said slide by controlling said load current that is supplied to said servo motor so that it corresponds to a pre-set slide motion;
• when said slide position, which is inputted from said scale detection device, reaches a set slide position value, said NC control device corrects a set bottom dead center of said slide according to a load correction value, which is a difference between a slide load value, which is calculated by said NC control device, and a set slide load value.