Press-forming device, press-forming method, computer program/software arrangement and storage medium

1. A non-transitory computer-readable medium having instructions stored thereon, such that when the instructions are read and executed by a processor, the processor is configured to perform the steps of:

causing at least one of:

providing at least one first characteristic from material characteristics comprising a thickness of the at least one portion of the material, a yield strength of the at least one portion of the material, about 0.2% proof stress, a tensile strength of the at least one portion of the material, an elongation of the at least one portion of the material, n value of the at least one portion of the material, r value of the at least one portion of the material, a stress-strain relation equation for the at least one portion of the material, a hardness of the at least one portion of the material, temperature, a surface roughness of the at least one portion of the material, a friction coefficient of the at least one portion of the material or a lubricant film thickness of the at least one portion of the material, or

measuring at least one second characteristic of the material characteristics before the at least one portion of the material is form;

measuring a state variable comprising a metal mold distortion amount, or the state variable and at least one of state variables comprising a punch reaction, a metal mold temperature, a work piece deformation amount or a work piece temperature during the formation of the at least one portion of the material;

determining from a first moment to a second moment of at least one particular processing condition from at least one of a forming speed of the at least one portion of the material, a blank holding force or a metal mold temperature as a function of at least two of the at least one first characteristic, the at least one second characteristic or the at least one of the state variables, wherein said determining is performed using (i) a first influence function matrix for indicating a relation between a material characteristic of the material and a correction amount of the at least one particular processing condition, and (ii) a second influence function matrix for indicating a relation between a state variable and the correction amount of the at least one particular processing condition; and

controlling

the at least one processing condition from processing conditions comprising at least one of a punch movement speed, a die movement speed, a metal mold temperature or a blank holding force based on the at least one processing condition,

correcting an initialization value C0(i) of the at least one processing condition using:

C 0( i )(after correction)= C 0( i )(initialization value)*(1+Σ( T 1( i,j )*( P ( j )/ P 0( j )−1)))

( i= 1 −L,j= 1 −M ),

where T1(i,j) is an influence function matrix which indicates a relation between a deviation of the material characteristic of a material from a reference value thereof and an amount of correction of the at least one processing condition, where P(j) are material characteristic values, where P0(j) are reference values for respective material characteristics, where L is a number of processing condition set values, and where M is a number of the material characteristic values, and

correcting (iii) correct the at least one processing condition using:

C ( i )= C 0( i )*(1+Σ( T 2( i,k )*( S ( k )/ S 0( k )−1))),( i= 1 −L,k= 1 −N ),

where C(i) (i=1−L) are correction values for respective processing conditions, where T2(i,k) (i=1−L, k=1−N) is an influence function matrix which indicates a relation between a deviation of a measured state variable to a reference value and a correction amount of the at least one processing condition, where S(k) (k=1−N) is the state variable, where S0(k) (k=1−N) is a reference state variable, and where N is a number of the state variable.

2. A method comprising:

controlling the at least one processing condition from processing conditions comprising at least one of a punch movement speed, a die movement speed, a metal mold temperature or a blank holding force based on the at least one processing condition;

correcting an initialization value C0(i) of the at least one processing condition using:

C 0( i )(after correction)= C 0( i )(initialization value)*(1+Σ( T 1( i,j )*( P ( j )/ P 0( j )−1)))

( i= 1 −L,j= 1 −M ),

where T1(i,j) is an influence function matrix which indicates a relation between a deviation of the material characteristic of a material from a reference value thereof and an amount of correction of the at least one processing condition, where P(j) are material characteristic values, where P0(j) are reference values for respective material characteristics, where L is a number of processing condition set values, and where M is a number of the material characteristic values; and correcting the at least one processing condition using:

C ( i )= C 0( i )*(1+Σ( T 2( i,k )*( S ( k )/ S 0( k )−1))),( i= 1 −L,k= 1 −N ),

where C(i) (i=1−L) are correction values for respective processing conditions, where T2(i,k) (i=1−L, k=1−N) is an influence function matrix which indicates a relation between a deviation of a measured state variable to a reference value and a correction amount of the at least one processing condition, where S(k) (k=1−N) is the state variable, where S0(k) (k=1−N) is a reference state variable, and where N is a number of the state variable.

3. A non-transitory computer-readable medium having instructions stored thereon, said instructions are read and executed by a processor for causing the processor to perform the method according to claim 2 .