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

A method for press-forming at least one section of a material according to at least one predetermined forming condition, comprising:

• at least one of:
• providing at least first one 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 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 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 the determination 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 the state variable and the correction amount of the at least one particular processing condition;
• 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:
• C0(i)(after correction)=C0(i)(initialization value)*(1+Σ(T1(i,j)*(P(j)/P0(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)=C0(i)*(1+Σ(T2(i,k)*(S(k)/S0(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.

A method for press-forming at least one section of a material according to at least one predetermined forming condition, comprising:

• measuring a state variable comprising a metal mold distortion amount, or the state variable and at least one variable from state variables which comprise a punch reaction, a metal mold temperature, a work piece deformation amount or a work piece temperature during a formation of the at least one section of the material, and storing one or more measured state variables for every formation of the at least one section of the material;
• comparing at least one variable with at least one previously-measured or previously-obtained one of the state variable to generate a comparison result;
• determining from a first moment to a second moment at least one processing condition from at least one type a forming speed, a blank holding force, or a metal mold temperature using the comparison result, wherein the determination is performed using an influence function matrix for indicating a relation between the state variable and a correction amount of the at least one processing condition;
• controlling at least one processing condition of processing conditions which comprise 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;
• and
• correcting the at least one processing condition using:
• C(i)=C0(i)*(1+Σ(T2(i,k)*(S(k)/S0(k)−1))), (i=1-L, k=1-N),
• where C(i) (i=1-L) are correction values for respective processing conditions, where C0(i) is an initialization value, 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 a state variable, where S0(k) (k=1-N) is a reference state variable, where L is a number of processing condition set values, and where N is a number of the state variable.