CN102033013B - Method for measuring torsional resilience characteristics of plates - Google Patents
Method for measuring torsional resilience characteristics of plates Download PDFInfo
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- CN102033013B CN102033013B CN2009101966507A CN200910196650A CN102033013B CN 102033013 B CN102033013 B CN 102033013B CN 2009101966507 A CN2009101966507 A CN 2009101966507A CN 200910196650 A CN200910196650 A CN 200910196650A CN 102033013 B CN102033013 B CN 102033013B
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Abstract
The invention relates to the field of plate punching techniques, in particular to a measuring method of punching resilience of plates. The method for measuring the torsional resilience characteristics of plates comprises the following steps: determining a characteristic part; selecting three sections a, b and c on the characteristic part as standard sections; respectively measuring the width W of the top surface and the heights h1 and h2 of two ends of the top surface of each of the three sections a, b and c, and back calculating by an expression of tan theta=(h2-h1)/W to acquire the resilience angles theta 1, theta 2 and theta 3 of the three sections; and weighting the theta 1, theta 2 and theta 3 to acquire the torsional resilience characteristic parameter theta of the material used by the part by an expression of theta = xtheta 1 + ytheta 2 + ztheta 3, (x + y + z = 1), wherein x, y and z are weighting coefficients, and the numerical values of x, y and z are determined according to the shape of the actual production part. The measuring method provided by the invention is convenient and accurate, and theta is adopted for comprehensively evaluating the integral torsional resilience characteristics of the material, and providing a standard for the torsional resilience characteristics for selecting the material of the part.
Description
Technical field
The present invention relates to the plate stamping technology field, relate in particular to a kind of measuring method of plate stamping resilience.
Background technology
Along with rapid development of automobile industry, the competition of automobile industry is more and more fierce, and comfortable, safe and energy-saving automobile is accepted for the consumer, and high-strength steel sheet has obtained widespread use.Problems such as cracking, wrinkling, resilience appear in high-strength steel stamping moulding often.The resilience problem generally is divided into the angle resilience at present, curl resilience and three kinds of forms of distortion resilience; Wherein preceding two kinds of resilience forms have obtained the broad research of Chinese scholars; And the distortion resilience is various informative owing to form more complicated, distortion, does not have to form more complete research method at present.The part that produces the distortion resilience has had a strong impact on welding, the assembly quality of vehicle body.At present, method is not also appearred effectively overcoming in the distortion resilience.Evaluation to the distortion resilience does not at present also have to form more complete scheme.
Produce the part profile of distortion resilience, show as initial relatively profile and twist, can weigh distortion angle with angle.For realizing accurately to understand the windup-degree that produces behind the part punching, the distortion resilience is controlled according to measurement result to the control of distortion resilience.For this reason, need produce the cubing of the windup-degree of measuring the different profiles generations of part accurately, fast and easily.
Through retrieval discovery to prior art,
1) patent No. is WO 2008026777 A1, and denomination of invention is: springback angle measuring method, device and flow process, this patent has been carried out Measurement and analysis to the resilience of beam-like part, has proposed to adopt the angle of resilience front and back part section to estimate resilience.This method can evaluating parts bounce situations, but do not have the concrete distortion resilience method that proposes to measure part.
2) patent No. is KR 804962 B1; Denomination of invention is: the resilience measurement mechanism of beam-like part; This patent is measured the resilience of a concrete beam-like part, has proposed to adopt before and after the resilience angle of part section to estimate resilience, adopt the high evaluation of sidewall warpage to curl.This method can evaluating parts resilience, the situation of curling, but do not have specifically to propose the method for the distortion resilience of evaluating parts.
3) patent No. is JP 2008272781 A, and denomination of invention is: press die apparatus for thin plate, this patent is adjusted the mould that produces resilience, and the measure that reduces resilience is studied, and has realized the resilience of control part through innovative approach.This patent is not described and how the resilience of part is measured
4) patent No. is JP 2009012044 A, and denomination of invention is: press die apparatus for thin plate and method, this patent is adjusted the part that produces resilience, on the profile of part, has increased reinforcement control resilience, has improved the resilience of part.This patent is not described and how the distortion resilience of part is measured
Comprehensive above patent analyses can know that prior art is not directed against the evaluation criterion of the distortion resilience of part.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method of sheet material measurement distortion rebound characteristics, and the standard of an evaluating material distortion rebound characteristics is provided when selecting material for part.
The present invention is achieved in that a kind of method of sheet material measurement distortion rebound characteristics, may further comprise the steps:
Step 1, confirm the characteristic part, selected part with turning and two different in width cross sections is as standardized element, and selected corner angle α and two cross-sectional width D
1/ D
2Value γ;
A on step 2, the selected characteristic part, b, three cross sections of c are the standard section, and wherein a cross section is positioned at the variable cross section end radially, and b cross section and c cross section cross-perpendicular are radial and axial in the end, turning;
Step 3, measure width W and the height h1 and the h2 at end face two ends of the end face in a, b, three cross sections of c respectively,, calculate the spring back angle θ in three cross sections through tan θ=(h2-h1)/W
1, θ
2, θ
3
Step 4, to θ
1, θ
2, θ
3Weighting obtains the distortion rebound characteristics parameter θ=x θ of this part material therefor
1+ y θ
2+ z θ
3, (x+y+z=1), x, y, z are weight coefficient, according to the shape of actual production part, confirm the numerical value of x, y, z.
In the described step 1, the corner angle α of selected characteristic part is 125 °, two cross-sectional width D
1/ D
2Value γ be 1.4.
Weight coefficient x=y=z=1/3 in the described step 4.
In the described step 3, the value of the width W of cross section end face is confirmed through the selected measurement crossbeam that matches with the characteristic part, measures on the crossbeam and has measured hole, uses dial gauge to pass measured hole, measures the height h1 and the h2 at end face two ends.
The present invention obtains the distortion rebound characteristics parameter θ of this characteristic part material therefor through the distortion spring back angle in three cross sections of measurement features part after the weighting.Measuring method is accurately convenient, adopts θ to come the integral body distortion rebound characteristics of this material of comprehensive evaluation, and θ is big more, shows that the torsion characteristic of material is obvious more, helps factors such as research material, Sheet Metal Forming Technology to distortion influence springback rule.Can select suitable part through the θ value based on the needs of different part processing aborning, satisfy the requirement of processing, the standard of distortion rebound characteristics is provided when selecting material for part.
Description of drawings
Fig. 1 twists the measuring principle figure of resilience for the present invention;
The measurement point bitmap that Fig. 2 selectes for the present invention;
The characteristic part synoptic diagram that Fig. 3 confirms for the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's statement, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment one
A kind of method of measuring B400/780DP sheet material distortion rebound characteristics may further comprise the steps:
Step 1, confirm the characteristic part, selected part with turning and two different in width cross sections is as standardized element; According to select in the present embodiment to be distorted the easily part shape of resilience of the experience in producing in the past, corner angle α is 125 ° and two cross-sectional width D
1/ D
2Value γ be 1.4;
Step 2, as shown in Figure 3, a on the selected characteristic part, b, three cross sections of c are the standard section, and wherein a cross section is positioned at the variable cross section end radially, and b cross section and c cross section cross-perpendicular are radial and axial in the end, turning;
Step 3, like Fig. 1, shown in 2, use and measurement crossbeam that the characteristic part matches is measured the width W of a cross section end face
1Be 50mm, the width W of b cross section end face
2Be 54.3mm, the width W of c cross section end face
3Be 95mm; Measure on the crossbeam and have and a, b, the corresponding measured hole P1 in c cross section, P2, P3, P4, P5, P6; Use dial gauge to pass measured hole, measure the height h1 and the h2 at a, b, end face two ends, c cross section, obtain table 1 (unit is 0.01mm in the table); Wherein the height h1 in a cross section is P1, and h2 is P2; The height h1 in b cross section is P3, and h2 is P4; The height h1 in c cross section is P5, and h2 is P6;
Table 1
| P1 | P2 | P3 | P4 | P5 | P6 |
| 178 | 276 | 303 | 464 | 402 | 302 |
Calculate the distortion spring back angle θ in a, b, c cross section through formula tan θ=(h2-h1)/W
1, θ
2, θ
3Be respectively,
θ
1＝actan((P2-P1)/(100W
1))*180/∏＝1.123
θ
2＝actan((P4-P3)/(100W
2))*180/∏＝1.698
θ
3＝actan((P6-P5)/(100W
3))*180/∏＝0.603
Step 4, to θ
1, θ
2, θ
3Weighting obtains the distortion rebound characteristics parameter θ=x θ of this part material therefor
1+ y θ
2+ z θ
3, (x+y+z=1), when making common parts, the common difference of various cross section distortion influence springback is little, so weight selection coefficient x=y=z=1/3, the distortion rebound characteristics parameter θ that obtains B400/780DP sheet material is 1.141.
Embodiment two
A kind of method of measuring B340/590DP sheet material distortion rebound characteristics may further comprise the steps:
Step 1, confirm the characteristic part, selected part with turning and two different in width cross sections is as standardized element; According to select in the present embodiment to be distorted the easily part shape of resilience of the experience in producing in the past, corner angle α is 125 ° and two cross-sectional width D
1/ D
2Value γ be 1.4;
Step 2, as shown in Figure 3, a on the selected characteristic part, b, three cross sections of c are the standard section, and wherein a cross section is positioned at the variable cross section end radially, and b cross section and c cross section cross-perpendicular are radial and axial in the end, turning;
Step 3, like Fig. 1, shown in 2, use and measurement crossbeam that the characteristic part matches is measured the width W of a cross section end face
1Be 50mm, the width W of b cross section end face
2Be 54.3mm, the width W of c cross section end face
3Be 95mm; Measure on the crossbeam and have and a, b, the corresponding measured hole P1 in c cross section, P2, P3, P4, P5, P6; Use dial gauge to pass measured hole, measure the height h1 and the h2 at a, b, end face two ends, c cross section, obtain table 2 (unit is 0.01mm in the table); Wherein the height h1 in a cross section is P1, and h2 is P2; The height h1 in b cross section is P3, and h2 is P4; The height h1 in c cross section is P5, and h2 is P6;
Table 2
| P1 | P2 | P3 | P4 | P5 | P6 |
| 206 | 250 | 335 | 422 | 386 | 279 |
Calculate the distortion spring back angle θ in a, b, c cross section through formula tan θ=(h2-h1)/W
1, θ
2, θ
3Be respectively,
θ
1＝actan((P2-P1)/(100W
1))*180/∏＝0.504
θ
2＝actan((P4-P3)/(100W
2))*180/∏＝0.918
θ
3＝actan((P6-P5)/(100W
3))*180/∏＝0.645
Step 4, to θ
1, θ
2, θ
3Weighting obtains the distortion rebound characteristics parameter θ=x θ of this part material therefor
1+ y θ
2+ z θ
3, (x+y+z=1), when making common parts, the common difference of various cross section distortion influence springback is little, so weight selection coefficient x=y=z=1/3, the distortion rebound characteristics parameter θ that obtains B340/590DP sheet material is 0.689.
Embodiment three
A kind of method of measuring B450LA sheet material distortion rebound characteristics may further comprise the steps:
Step 1, confirm the characteristic part, selected part with turning and two different in width cross sections is as standardized element; According to select in the present embodiment to be distorted the easily part shape of resilience of the experience in producing in the past, corner angle α is 125 ° and two cross-sectional width D
1/ D
2Value γ be 1.4;
Step 2, as shown in Figure 3, a on the selected characteristic part, b, three cross sections of c are the standard section, and wherein a cross section is positioned at the variable cross section end radially, and b cross section and c cross section cross-perpendicular are radial and axial in the end, turning;
Step 3, like Fig. 1, shown in 2, use and measurement crossbeam that the characteristic part matches is measured the width W of a cross section end face
1Be 50mm, the width W of b cross section end face
2Be 54.3mm, the width W of c cross section end face
3Be 95mm; Measure on the crossbeam and have and a, b, the corresponding measured hole P1 in c cross section, P2, P3, P4, P5, P6; Use dial gauge to pass measured hole, measure the height h1 and the h2 at a, b, end face two ends, c cross section, obtain table 3 (unit is 0.01mm in the table); Wherein the height h1 in a cross section is P1, and h2 is P2; The height h1 in b cross section is P3, and h2 is P4; The height h1 in c cross section is P5, and h2 is P6;
Table 3
| P1 | P2 | P3 | P4 | P5 | P6 |
| 201 | 242 | 309 | 415 | 374 | 246 |
Calculate the distortion spring back angle θ in a, b, c cross section through formula tan θ=(h2-h1)/W
1, θ
2, θ
3Be respectively,
θ
1＝actan((P2-P1)/(100W
1))*180/∏＝0.470
θ
2＝actan((P4-P3)/(100W
2))*180/∏＝1.118
θ
3＝actan((P6-P5)/(100W
3))*180/∏＝0.772
Step 4, to θ
1, θ
2, θ
3Weighting obtains the distortion rebound characteristics parameter θ=x θ of this part material therefor
1+ y θ
2+ z θ
3, (x+y+z=1), when making common parts, the common difference of various cross section distortion influence springback is little, so weight selection coefficient x=y=z=1/3, the distortion rebound characteristics parameter θ that obtains B450LA sheet material is 0.787.
Comprehensive above-mentioned three embodiment, the distortion rebound characteristics that can obtain B340/590DP is superior to B450LA, and the distortion rebound characteristics of B450LA is superior to B400/780DP; And what need special declaration is, in actual production, because the difference of different part shapes causes θ
1, θ
2, θ
3Influence degree to the distortion rebound characteristics of this part is different, thus the selection of x, y, z data confirm according to the shape of the part of actual production, choose suitable material for part at last according to the θ value that obtains.
Claims (4)
1. the method for a sheet material measurement distortion rebound characteristics is characterized in that, may further comprise the steps:
Step 1, confirm the characteristic part, selected part with turning and two different in width cross sections is as standardized element, and selected corner angle α and two cross-sectional width D
1/ D
2Value γ;
A on step 2, the selected characteristic part, b, three cross sections of c are the standard section, and wherein a cross section is positioned at the variable cross section end radially, and b cross section and c cross section cross-perpendicular are radial and axial in the end, turning;
Step 3, measure width W and the height h1 and the h2 at end face two ends of the end face in a, b, three cross sections of c respectively,, calculate the spring back angle θ in three cross sections through tan θ=(h2-h1)/W
1, θ
2, θ
3
Step 4, to θ
1, θ
2, θ
3Weighting obtains the distortion rebound characteristics parameter θ=x θ of this part material therefor
1+ y θ
2+ z θ
3, x+y+z=1, x, y, z are weight coefficient, according to the shape of actual production part, confirm the numerical value of x, y, z.
2. the method for sheet material measurement distortion rebound characteristics as claimed in claim 1 is characterized in that: in the described step 1, the corner angle α of selected characteristic part is 125 °, two cross-sectional width D
1/ D
2Value γ be 1.4.
3. according to claim 1 or claim 2 the method for sheet material measurement distortion rebound characteristics is characterized in that: weight coefficient x=y=z=1/3 in the described step 4.
4. the method for sheet material measurement distortion rebound characteristics as claimed in claim 3; It is characterized in that: in the described step 3; The value of the width W of cross section end face is confirmed through the selected measurement crossbeam that matches with the characteristic part; Measure on the crossbeam and have measured hole, use dial gauge to pass measured hole, measure the height h1 and the h2 at end face two ends.
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|---|---|---|---|
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|---|---|---|---|
| CN2009101966507A CN102033013B (en) | 2009-09-28 | 2009-09-28 | Method for measuring torsional resilience characteristics of plates |
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