Press angle control device, press machine facility, and press angle control method

A press machine facility comprising:

• (a) a plurality of press machines, wherein the plurality of press machines constitute a press line, wherein each press machine has a press angle;
• and
• (b) a press angle control device that controls the press angles of the plurality of press machines,
• wherein the press angle control device includes
• (i) a reference value output unit that outputs a press angle reference value;
• (ii) a plurality of press angle detection units;
• (iii) a plurality of speed command units;
• and
• (iv) a plurality of driving units, wherein one press angle detection unit, one speed command unit, and one driving unit are provided for each of the press machines,
• wherein the press angle detection unit detects the press angle of the corresponding press machine and outputs a press angle detection value,
• wherein the speed command unit outputs a command speed value to a motor of the corresponding press machine on the basis of the press angle reference value and the press angle detection value,
• wherein the driving unit controls a speed of the motor of the corresponding press machine on the basis of the command speed value;
• and
• (e) a correction unit that corrects the command speed value or the press angle reference value so that a difference between the press angle reference value and the press angle for each of the press machines is within a predetermined range, and wherein the correction unit corrects the command speed value or the press angle reference value so that the command speed value increases until a time point when a pressing process starts.

A press angle control method for a press machine facility provided with a plurality of press machines constituting a press line, the method comprising the steps of:

• (a) outputting a press angle reference value from a reference value output unit,
• (b) detecting a press angle of a corresponding press machine,
• (c) outputting a press angle detection value, wherein a press angle detection unit detects the press angle of the corresponding press machine and outputs the press angle detection value,
• (d) outputting a command speed value to a motor of the press machine on the basis of the press angle reference value and the press angle detection value, wherein the command speed value is outputted by a speed command unit,
• (e) controlling a speed of the motor of the press machine on the basis of the command speed value, wherein the speed of the motor of the press machine is controlled by a driving unit;
• and
• (f) correcting the command speed value or the press angle reference value so that a difference between the press angle reference value and the press angle for each of the press machines is within a predetermined range, wherein the command speed value and the press angle reference value are corrected by a correction unit, and wherein the correction unit corrects the command speed value or the press angle reference value so that the command speed value increases until a time point when a pressing process starts.