Method and apparatus for adjusting press operating conditions depending upon dies used
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKazunari Kirii
Life of this patent
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Abstract
Method and apparatus applicable to a press using a die set including a lower and an upper die which are removably installed movably towards and away from each other to perform a pressing operation under the adjusted operating conditions. A memory is provided to store machine information relating to the press and necessary to determine optimum values for the operating conditions. Die set information relating to the die set and necessary to determine the optimum values are received through a data input device. A calculating device calculates the optimum values, based on the machine information and the die set information, and an adjusting device automatically adjusts the operating conditions according to the calculated optimum values.
Claims12
A method of automatically adjusting a holding force applied to blanks during a pressing job in a pressing machine, said holding force being produced by a fluid-actuated cylinder, comprising the steps of:
- counting the number of pressing cycles which have been performed on successive blanks;
- and
- adjusting a fluid pressure of said fluid-actuated cylinder so as to adjust said holding force, said fluid pressure, which determines said holding force, decreasing with an increase in said counted number of said pressing cycles performed on successive blanks during said pressing job.
An apparatus for automatically adjusting a holding force applied to blanks during a pressing job in a pressing machine, said holding force being produced by a fluid-actuated cylinder, said apparatus comprising:
- means for adjusting a fluid pressure of said fluid-actuated cylinder so as to adjust said holding force;
- means for counting the number of pressing cycles which have been performed on successive blanks during said pressing job;
- and
- means for controlling said adjusting means so that said fluid pressure, which determines said holding pressure and which is adjusted by said adjusting means, deceases with an increase in said number of said pressing cycles counted by said counting means.
A method of automatically adjusting a holding force applied to blanks during a pressing job in a pressing machine, said pressing machine having a die set including a lower and an upper die, a pressure ring, and a fluid-actuated cylinder to produce said holding force, said method comprising the steps of:
- determining a temperature of a blank holding portion of said die set;
- and
- adjusting said fluid pressure so that said fluid pressure, which determines said holding force, decreases with an increase in said determined temperature of said blank holding portion.
An apparatus for automatically adjusting a holding force applied to blanks during a pressing job in a pressing machine, said pressing machine having a die set including a lower and an upper die, a pressure ring, and a fluid-actuated cylinder to produce said holding force, said apparatus comprising:
- means for determining a temperature of a blank holding portion of said die set;
- means for adjusting said fluid pressure;
- and
- means for controlling said adjusting means so that said fluid pressure, which determines said holding force and which is adjusted by said adjusting means, decreases with an increase in said temperature of said blank holding portion determined by said temperature determining means.
Dependencies are inferred from the claim text.