CN104226766A - Method and device for evaluating sheet metal stamping imbalance flow springback characteristic - Google Patents
Method and device for evaluating sheet metal stamping imbalance flow springback characteristic Download PDFInfo
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- CN104226766A CN104226766A CN201310247215.9A CN201310247215A CN104226766A CN 104226766 A CN104226766 A CN 104226766A CN 201310247215 A CN201310247215 A CN 201310247215A CN 104226766 A CN104226766 A CN 104226766A
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- die
- stamping
- imbalance
- test specimen
- rebound characteristics
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Abstract
The invention discloses a method for evaluating sheet metal stamping imbalance flow springback characteristic. The method includes: making to-be-evaluated sheet metal into a strip-shaped test piece; stamping the strip-shaped test piece in a female mold in the shape of an inverted Chinese character 'ji', and fixing a first end of the strip-shaped test piece to enable the material on one side of the end not to generate flow deformation, and forming a bend between the first end and a second end of the stamped test piece, wherein an acute included angle between the first end and the profile of the concave mold is theta1, and an acute included angle between the second end and the profile of the concave mold is theta2; measuring angle values of the theta1 and the theta2; computing a stamping imbalance flow springback characteristic parameter theta of the sheet metal according to formulas that theta=xtheta1+ytheta2 and x+y=1, wherein x and y represents weights of the theta1 and the theta2 respectively; evaluating the stamping imbalance flow springback characteristic of the sheet metal according to the theta, wherein the larger the theta is, the obvious the stamping imbalance flow springback characteristic is. The invention further discloses a device adopted in the method for evaluating the sheet metal stamping imbalance flow springback characteristic.
Description
Technical field
The present invention relates to a kind of material property evaluation method and device, particularly relate to a kind of evaluation method and device of sheet stamping forming performance.
Background technology
Along with the fast development of auto industry, comfortable, safe and energy-conservation automobile become a kind of trend gradually and more and more accept by numerous consumer, in order to cater to this trend, high-strength steel sheet is widely used in automotive field.But, in manufacturing process, often there is the mass defects such as cracking, wrinkling, resilience in the high-strength steel sheet after stamping, wherein resilience is the key point causing high-strength steel stamping forming quality defect.Non-equilibrium flow dynamic deformation is a kind of common deformation behaviour in stamping process, and on the impact of the resilience of part, comparatively large and its rule is not easy to hold for it.
Non-equilibrium flow dynamic deformation feature is comparatively common in stamping, and cause the reason of non-equilibrium flow dynamic deformation to be also varied, such as local drawing depth difference is comparatively large, the shape anomaly, bead irrational distribution etc. of part, or due to the deformation state of material different and result in part and produce the mass defect such as resilience, distortion.
Publication number is JP2006035245A, publication date is on February 9th, 2006, it is a kind of without the need to adjusting metal die or examination punching press that name is called that the Japanese documentation of " a kind of method controlling stamping product resilience " discloses, the method of the resilience defect of stamping product is prevented with higher dimensional precision, by from a sheet metal cutting uneven less sheet metal to form pretreatment sheet metal, carried out the resilience adjusting to control stamping product by uneven less sheet metal through the residual stress of stamping product.Further, less sheet metal is made into relief-type, polygonal pyramid shape, cross or star; Transversely direction and/or longitudinal direction concave surface and convex surface alternately repeat, or along the direction tilted.This patent document relate to resilience defect about producing in part punching process and control method thereof, the method can improve the resilience defect of punching parts, but this patent document does not propose the technological means specifically measuring resilience, especially do not relate to the method measuring uneven flowing resilience feature.
Publication number is WO2008026777A, publication date is on March 6th, 2008, name is called that the international patent documents of " springback angle measuring method, device and flow process " relate to a kind of method determining to produce resilience reason, it comprises the Analysis of stamping forming step repeatedly analyzed stamping situation and obtain stamping product shaping data, does not calculate the calculation procedure of at least one item number certificate in the physical features in shaping product section region and physical quantity based on formed data and is calculated the calculation procedure of springback capacity by result of calculation.This patent document has carried out measuring and analyzing to the springback capacity of beam-like part, it adopts the angle of part section before and after resilience to evaluate resilience, the method can the bounce situations of evaluating parts, but does not relate to part rebound characteristics and measuring method thereof that non-equilibrium flow dynamic deformation occurs.
Publication number is KR100804962, publication date is on February 20th, 2008, name is called that the Korean patent document of " a kind of equipment measuring resilience distortion " discloses a kind of measurement mechanism of beam-like part resilience, the resilience of this Korean patent document to concrete beam-like part is measured, propose simultaneously and adopt the angle of part section before and after resilience to evaluate resilience, adopt the height of sidewall warpage to evaluate curling.Can the resilience of evaluating parts and curling situation by method disclosed in this patent, but, its part rebound characteristics also not openly when beam-like part generation non-equilibrium flow dynamic deformation and measure the method for this rebound characteristics.
Comprehensive above-mentioned patent document, not yet forms evaluation method and the standard of comparatively complete, system at present to the rule, influence factor, feature etc. of imbalance flowing resilience feature, also not disclose a kind of imbalance of can measuring simultaneously and flow the device of rebound characteristics.
Summary of the invention
An object of the present invention is to provide the evaluation method of a kind of plate stamping imbalance flowing rebound characteristics, the characterisitic parameter of its imbalance of punching press by sheet material measurement flowing rebound characteristics evaluates plate stamping imbalance flowing rebound characteristics, thus the forming technology of sheet material is determined according to plate stamping imbalance flowing rebound characteristics, and then meet the processing request of material, improve the quality of stamping product.
To achieve these goals, the present invention proposes the evaluation method of a kind of plate stamping imbalance flowing rebound characteristics, it comprises the following steps:
(1) sheet material to be evaluated is made banded test specimen, this banded test specimen has a first end and one second end in their length direction;
(2) banded test specimen is fallen one
punching press is carried out in the die of type, fix described first end in punching course and flow deformation does not occur to make the material of this side of first end, have the kink between first end and the second end through the test specimen of punching press, the acute angle of described first end and die profile is θ
1, the acute angle of described second end and die profile is θ
2;
(3) θ is measured
1and θ
2angle value;
(4) according to formula θ=x θ
1+ y θ
2, x+y=1 calculates plate stamping imbalance flowing rebound characteristics parameter θ, and in formula, x, y represent θ respectively
1and θ
2shared weight;
(5) evaluate the punching press imbalance flowing rebound characteristics of sheet material according to θ value, the punching press imbalance flowing rebound characteristics of the larger then sheet material of θ value is more obvious.
Can there is resilience in sheet material, this is caused by non-equilibrium flow dynamic deformation when stamping, and technical scheme of the present invention is by measuring the angle value θ at banded test specimen two ends and die face
1and θ
2, using the θ obtained after weighting process as the characterisitic parameter evaluating the uneven drawing resilience of this material for test.This characterisitic parameter θ can the uneven drawing rebound characteristics of overall merit materials and process, when θ is larger, show that the uneven drawing rebound characteristics of material is more obvious, larger on the impact of stamping product, be unfavorable for obtaining superior in quality formed product, therefore, in actual production, follow this rule, need to come the applicable material of selected part and forming technology by characterisitic parameter θ according to the processing of different part.
X in the technical program, y represents θ respectively
1and θ
2shared weight, its value chooses according to the shape of actual parts, and that is, in evaluation procedure, more keeping in mind resits an exam considers the weight which end which end just increases the weight of.
In general, for the common parts of regular shape, the usual difference of impact of its various cross sections distortion resilience is little, so preferably gets x=y=1/2.
Further, in the evaluation method of above-mentioned plate stamping imbalance flowing rebound characteristics, following step is adopted to measure θ in step (3)
1and θ
2angle value:
A given level reference, gets any two points A and B along its length respectively at first end, gets any two points C and D respectively along its length at the second end;
Measure height h1 and h2 of A point and B point distance level reference, and A point and B point spacing W1 in the horizontal direction; Measure height h3 and h4 of C point and D point distance level reference, and C point and D point spacing W2 in the horizontal direction;
According to tan θ
1=| h2-h1|/W1, tan θ
2,=| h3-h4|/W2 obtains θ
1and θ
2angle value.
According to institute measuring angle θ
1and θ
2corresponding opposite side and the length of adjacent side, obtain θ by tan inverse
1and θ
2angle value, can obtain the angle value of banded test specimen two ends and die face.
Correspondingly, the device that two of object of the present invention is also to provide the evaluation method that above-mentioned plate stamping imbalance flows rebound characteristics to adopt, it comprises:
One cross section is for falling
the die of type, it comprises a bed die and a mold, and banded test specimen is arranged between bed die and mold;
One punch mated with above-mentioned die;
One grip block being located at above-mentioned die side, it is in order to clamp the first end of banded test specimen to fix this first end;
Above-mentioned punch and die are set in the height direction relative movement to occur, with the banded test specimen of punching press.
Further, above-mentioned grip block is arranged at mold side with wherein one end of fixing banded test specimen.
Preferably, a lower bolster is also provided with below above-mentioned bed die.
Preferably, a upper padding plate is also provided with above above-mentioned mold.
Alternatively, above-mentioned punch is connected with a drive unit, is pressed in die to drive punch.
The evaluation method of plate stamping imbalance flowing rebound characteristics of the present invention, punching press imbalance can be evaluated by the angle value between the two ends of banded test specimen and die face to flow the characterisitic parameter θ of rebound characteristics to obtain, be conducive to staff and determine material character and processing technology according to the forming requirements of part, reduce the resilience defect of formed product, guarantee the quality of end product.
The device that the evaluation method that plate stamping imbalance of the present invention flows rebound characteristics adopts, structure is simple, simple operation.
Accompanying drawing explanation
The structural representation of device under a kind of detailed description of the invention that the evaluation method that Fig. 1 is plate stamping imbalance flowing rebound characteristics of the present invention adopts.
Fig. 2 is for the device shown in Fig. 1 is at the partial enlarged drawing at I place.
The schematic diagram of Fig. 3 for adopting the device shown in Fig. 1 that uneven drawing resilience occurs when the banded test specimen of punching press.
Fig. 4 measures the θ that uneven drawing resilience occurs for adopting the device shown in Fig. 1 when the banded test specimen of punching press
1and θ
2the principle schematic of angle value.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment the plate stamping imbalance flowing evaluation method of rebound characteristics of the present invention and the device of employing thereof made and describing in detail further, but this explanation does not form the improper restriction for technical solution of the present invention.
As shown in Figure 1, the device that the evaluation method of the plate stamping imbalance flowing rebound characteristics in the present invention adopts comprises: cross section is rendered as down
the die 11 of type, this die 11 also comprises mold 14 and bed die 15, and banded test specimen can be placed between mold 14 and bed die 15 and carry out punching press; Punch 12, itself and die 11 are suitable; Also be provided with grip block 13 on the side of mold 14, between this grip block 13 and mold 14, form the first end of gap in order to fixing banded test specimen; Relative movement can be there is to realize the stamping of banded test specimen relative to die 11 in punch 12 in Z-direction; In addition, above mold 14 and the below of bed die 15 be also respectively equipped with upper padding plate 16 and lower bolster 17.
As shown in Figure 2, the cross section of bed die 15 is rendered as and is similar to
shape.
In addition, punch 12 is directly connected with drive unit, and it is stamping to complete that this drive unit drives punch 12 to be pressed in die 11.
As shown in Figures 1 to 4, utilize said apparatus as follows for the imbalance flowing rebound characteristics step carrying out evaluating of plate stamping, the technical parameter involved by correlation step is as shown in table 1:
1) sheet material of required evaluation is made banded test specimen 10, banded test specimen 10 has first end 101 and the second end 102 on himself length direction;
2) banded test specimen 10 is carried out stamping in die 11, fixing first end between the gap first end 101 of banded test specimen being placed on grip block 13 and mold 14 in punching course makes the band material of this side of first end flow deformation not occur, the ultimate depth of given punching press is 70mm, given stamping press is 5KN, test specimen after punching press, exists and is similar between its first end 101 and second end 102
kink, the acute angle formed between first end 101 and mold 14 profile is θ
1, the acute angle formed between the second end 102 and mold 14 profile is θ
2, specifically can see Fig. 3;
3a) using mold 14 profile as a level reference, get any two points respectively along its length at first end, be designated as A and B, get any two points respectively along its length at the second end, be designated as C and D;
3b) measure AB 2 spacing W1=50mm in the horizontal direction, and when being in different press depth in stamping process A point and B point apart from height h1 and h2 of level reference; Measure CD 2 spacing W2=50mm in the horizontal direction, and height h3 and h4 of C point and D point distance level reference when being in different press depth in stamping process;
3c) according to tan θ
1=h2-h1/W1, and tan θ
2,=h4-h3/W2 obtains θ
1and θ
2angle value, and by θ when being in final press depth
1and θ
2as the calculating basis of step 4), specifically can see Fig. 4;
4) according to formula θ=x θ
1+ y θ
2, make x=y=0.5, calculate plate stamping imbalance flowing rebound characteristics parameter θ;
5) the θ value obtained according to step 4) evaluates the punching press imbalance flowing rebound characteristics of banded test specimen, when θ value is larger, the punching press imbalance flowing rebound characteristics of banded test specimen is more obvious, and the resilience defect that it has is more serious, and the product quality after stamping is poorer.
As shown in Figure 3, the banded test specimen in punching course causes resilience defect at region a and b place, region because of the flowing of punching press imbalance.
It should be noted that, when making common parts, difference is little usually in the resilience impact at banded test specimen two ends, therefore will represent θ respectively
1and θ
2x, y weighted value is all set to 0.5.
The θ that table 1 shows the associated technical parameters in the evaluation method of the plate stamping imbalance flowing rebound characteristics of embodiment and surveys
1, θ
2and θ value.
Table 1.
As shown in Table 1, the characterisitic parameter θ adopting the punching press imbalance flowing resilience of the banded test specimen of B210P1 material is 19.7 °, and adopt the characterisitic parameter θ of the punching press of the banded test specimen of DC54D+Z material imbalance flowing resilience to be 10.35 °, because characterisitic parameter θ value makes more greatly the punching press of sheet material imbalance flowing rebound characteristics more obvious, then more be unfavorable for stamping, so for making identical parts, the uneven drawing rebound characteristics of DC54D+Z material is more weak, more can meet the demand of part punching processing, be more suitable for for the manufacture of high-quality finished part.
That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, has many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.
Claims (8)
1. an evaluation method for plate stamping imbalance flowing rebound characteristics, is characterized in that, comprise the following steps:
(1) sheet material to be evaluated is made banded test specimen, this banded test specimen has a first end and one second end in their length direction;
(2) banded test specimen is fallen one
punching press is carried out in the die of type, fix described first end in punching course and flow deformation does not occur to make the material of this side of first end, have the kink between first end and the second end through the test specimen of punching press, the acute angle of described first end and die profile is θ
1, the acute angle of described second end and die profile is θ
2;
(3) θ is measured
1and θ
2angle value;
(4) according to formula θ=x θ
1+ y θ
2, x+y=1 calculates plate stamping imbalance flowing rebound characteristics parameter θ, and in formula, x, y represent θ respectively
1and θ
2shared weight;
(5) evaluate the punching press imbalance flowing rebound characteristics of sheet material according to θ value, the punching press imbalance flowing rebound characteristics of the larger then sheet material of θ value is more obvious.
2. the evaluation method of plate stamping imbalance flowing rebound characteristics as claimed in claim 1, is characterized in that, x=y=1/2.
3. the evaluation method of plate stamping imbalance flowing rebound characteristics as claimed in claim 1, is characterized in that, adopt following step to measure θ in step (3)
1and θ
2angle value:
A given level reference, gets any two points A and B along its length respectively at described first end, gets any two points C and D respectively along its length at described second end;
Measure height h1 and h2 of A point and B point distance level reference, and A point and B point spacing W1 in the horizontal direction; Measure height h3 and h4 of C point and D point distance level reference, and C point and D point spacing W2 in the horizontal direction;
According to tan θ
1=| h2-h1|/W1, tan θ
2,=| h3-h4|/W2 obtains θ
1and θ
2angle value.
4. the device that the evaluation method as the plate stamping imbalance flowing rebound characteristics in claim 1-3 as described in any one adopts, is characterized in that, comprising:
One cross section is for falling
the die of type, it comprises a bed die and a mold, and banded test specimen is arranged between bed die and mold;
One punch mated with described die;
One grip block being located at described die side, it is in order to clamp the first end of banded test specimen to fix this first end;
Described punch and die are set in the height direction relative movement to occur, with the banded test specimen of punching press.
5. device as claimed in claim 4, it is characterized in that, described grip block is arranged at mold side.
6. device as claimed in claim 4, is characterized in that, be also provided with a lower bolster below described bed die.
7. device as claimed in claim 4, is characterized in that, be also provided with a upper padding plate above described mold.
8. device as claimed in claim 4, it is characterized in that, described punch is connected with a drive unit, is pressed in die to drive punch.
Priority Applications (1)
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|---|---|---|---|
| CN201310247215.9A CN104226766A (en) | 2013-06-20 | 2013-06-20 | Method and device for evaluating sheet metal stamping imbalance flow springback characteristic |
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|---|---|---|---|
| CN201310247215.9A CN104226766A (en) | 2013-06-20 | 2013-06-20 | Method and device for evaluating sheet metal stamping imbalance flow springback characteristic |
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Cited By (3)
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| CN111655391A (en) * | 2018-01-30 | 2020-09-11 | 杰富意钢铁株式会社 | Compression molding method, rigidity-improving position determining method, compression molding system, and compression molded article |
| CN112453160A (en) * | 2020-11-24 | 2021-03-09 | 李方 | Metal plate stamping correction method |
| US11731187B2 (en) | 2018-01-30 | 2023-08-22 | Jfe Steel Corporation | Press forming method, rigidity-improvement-position specifying method, press forming system, and press-formed product |
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| CN111655391A (en) * | 2018-01-30 | 2020-09-11 | 杰富意钢铁株式会社 | Compression molding method, rigidity-improving position determining method, compression molding system, and compression molded article |
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| CN112453160A (en) * | 2020-11-24 | 2021-03-09 | 李方 | Metal plate stamping correction method |
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Application publication date: 20141224 |