CN110087791A - Press-processing method - Google Patents
Press-processing method Download PDFInfo
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- CN110087791A CN110087791A CN201780076848.4A CN201780076848A CN110087791A CN 110087791 A CN110087791 A CN 110087791A CN 201780076848 A CN201780076848 A CN 201780076848A CN 110087791 A CN110087791 A CN 110087791A
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- Prior art keywords
- product
- shape
- longitudinal wall
- wall part
- press
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/005—Multi-stage presses
Abstract
Shape of product stamping product is formed in press-processing method of the invention, the shape of product stamping product is the cross sectional shape of the hat with along forming height direction convex curved top plate portion and longitudinal wall part, and when the bending of top plate portion to be set as to the radius of curvature of shape of product and longitudinal wall part is set as the length direction wire length of shape of product and is formed, the shape of product stamping product generates wrinkle in flange part, in the press-processing method, the shape of product stamping product is formed in a manner of the curved radius of curvature of the convex of top plate portion to be remained to the radius of curvature of shape of product without change, it is characterized in that, the press-processing method includes the longitudinal wall forming process for shaping longitudinal wall part, the longitudinal wall part have under overlook view along its length on the inside of width direction concavely The convex curve portion that bending and radius of curvature are 5000mm or more, longitudinal wall forming process make the length direction wire length of longitudinal wall part increase by 0.0002~0.0263% than the length direction wire length of shape of product.
Description
Technical field
The present invention relates to press-processing method (press forming), more particularly to for convex along forming height direction
Shape the cross sectional shape of curved U-shaped (U-shaped) or hat (hat-shaped) stamping product (press
Formed part) carry out stamping press-processing method.
Background technique
In recent years, in order to realize with CO2The light weight of body of a motor car (automotive body) for the purpose of discharge rate reduction
Change (weight reduction), high-strength steel sheet (high- is applicable in for auto parts (automotive part)
Strength thin steel sheet) the case where be constantly in progress.Also, in the manufacture of auto parts, be applicable in manufacture at
This is excellent stamping.However, for example carrying out punching press in the part (part) of the cross sectional shape of to convex curved hat
In the case where forming, exist the end as the blank (blank) of flange part (flange portion) in forming process into
Row shrinks the project that flange deforms (shrink flange forming) and is easy to produce wrinkle (wrinkles), is using
In the case where high-strength steel sheet, it is difficult to flatten the wrinkle of generation, thus especially become problem.
As such technology shrinking wrinkle caused by flange deforms and generating is inhibited, patent document 1 discloses following
Technology: for the cross sectional shape with U word or hat and when curved part is formed along its length, according to institute
It states on the basis of the flange part of part and becomes symmetrical mode for two parts while shaping, thus preferentially make material from described
The top plate portion side of part is mobile and generates stretch flange deformation (stretch flange forming), inhibits the flange part
Shrink the generation of wrinkle caused by flange deforms.
In addition, patent document 2 discloses following method: using wrinkle by compression mould (tool of blank holder)
When being pressed the stamping product for carrying out shaped cross-section cap shaped to blank material (blank material), at stamping end
Phase increases the wrinkle pressing force for generating the region for shrinking flange deformation.
In addition, patent document 3 discloses following method: in utilization two-stage bending forming method to curve tunnel component
When carrying out bending forming, in the first forming process, flanging muscle (groove shape) is formed in the side for receiving contraction distortion,
Next it is risen in the second forming process using the flanging muscle as the generation for heaving (buckling) for the origin for becoming wrinkle
Point, thus make it is each heave miniaturization, dispersion, be easy to flatten wrinkle forming is final.
Citation
Patent document
Patent document 1: No. 5967386 bulletins of Japanese Patent No.
Patent document 2: No. 5783339 bulletins of Japanese Patent No.
Patent document 3: Japanese Unexamined Patent Publication 2010-227995 bulletin
Summary of the invention
Subject to be solved by the invention
Method disclosed in patent document 1 is only capable of coping with for there are curved zero in the horizontal plane orthogonal with forming direction
Part carries out stamping situation, can not suitable for the present application as the along forming height direction convex curved of object
Bent stamping product.
In addition, method disclosed in patent document 2 only can be suitably used for being drawn into using charge support (blank holder)
Shape (deep drawing), in the stretch forming of the small high-strength steel sheet of ductility (ductility), if in forming
Greatly, then there is the danger that rupture (fracture) occurs, moreover, crash forming (crash can not be suitable in power (tension)
Forming) the case where.
In addition, method disclosed in patent document 3 can not be suitable in longitudinal wall part (side wall portion) not with more
The part of remaining shape, moreover, needing multiple forming process to inhibit the generation of wrinkle, therefore forming process number increases
And the problem of depositing in terms of cost.
The present invention makes to solve project as described above, and its purpose is to provide a kind of press-processing methods, closes
In along forming height direction convex curved U-shaped or the stamping product of the cross sectional shape of hat, it is able to suppress longitudinal wall part
Or the generation of the wrinkle of flange part carry out it is stamping.
Solution for solving the problem
In the past, shape of product stamping product 81 be Figure 10 and as shown in Figure 11 have along forming height direction convex
The curved top plate portion in ground (top portion) 83, from the continuous longitudinal wall part 85 of top plate portion 83, from the continuous flange part of longitudinal wall part 85
The cross sectional shape of 87 hat, the bending of the convex of top plate portion 83 are set as the radius of curvature (curvature of shape of product
radius)R0, and longitudinal wall part 85 is set as the length direction wire length of shape of product (for example, between top plate portion 83 and longitudinal wall part 85
The wire length L of ridgeline 840), as shown in figure 12, if using the mold being made of formed punch (punch) 63 and punch die (die) 65
(tool of press forming) 61 pairs of the said goods shape stamping products 81 are formed, then there are in flange part
87 lead to the problem of wrinkle.
The generation of the wrinkle of flange part 87 as such shape of product stamping product 81 will be because there are following reasons
By.That is, as previously described, because be bent along forming height direction convex, therefore (the ginseng of longitudinal wall part 85 is equivalent in blank 71
According to Figure 12) position, along with forming blank 71 flow into when, the length direction wire length of blank end 71a shortens.Therefore, may be used
Enumerate the case where contraction flange for being compressed (compress) by the curved circumferencial direction along the convex deforms S.Also,
When contraction flange deformation S is more than endurance of buckling (the buckling stress) of blank end 71a, can be produced in flange part 87
Raw wrinkle.
Therefore, the present application person inhibits the wrinkle of the flange part 87 of shape of product stamping product 81 in discussion
Method when, be conceived to following situation: shape of product stamping product 81 be such as auto parts in the case where, though shape
It is so set by the coordination with other auto parts, as long as but the bending of top plate portion 83 remains the curvature of shape of product
Radius R0, then will not become problem slightly changing shape about other positions.
Therefore, the bending for further having discussed the top plate portion 83 for the convex for making shape of product stamping product 81 remains production
The radius of curvature R of product shape0, inhibit the method for the wrinkle of flange part 87 by changing the shape at other positions.Its result
It is to have obtained following opinion: changes the shape of longitudinal wall part 85 in a manner of keeping the length direction wire length of longitudinal wall part 85 increased, by
This generates stretch flange deformation at the position that blank 71 flows into forming process, will shrink flange by stretch flange deformation
It deforms S to offset, thus, it is possible to inhibit the generation of the wrinkle of flange part 87.
The present invention is the invention made based on above-mentioned opinion, the invention being specifically made of structure below.
In press-processing method of the invention, shape of product stamping product is formed, the shape of product punching press
Formed products are that have along forming height direction convex curved top plate portion and the U-shaped from the continuous longitudinal wall part of the top plate portion
Or the cross sectional shape of hat, and the bending of the top plate portion is being set as to the radius of curvature of shape of product and by the longitudinal wall part
When being set as the length direction wire length of shape of product and being formed, the shape of product stamping product is in the longitudinal wall part or convex
Edge generates wrinkle, in the press-processing method, for the shape of product stamping product with by the convex of the top plate portion
The radius of curvature that the curved radius of curvature of shape remains the shape of product is formed without the mode of change, and feature exists
In the press-processing method includes the longitudinal wall forming process for shaping longitudinal wall part, and the longitudinal wall part has under overlook view
(planar view) is bent concavely to width direction inside along its length and radius of curvature is the concavity of 5000mm or more
Bending section (curved portion), the longitudinal wall forming process make the length direction wire length of the longitudinal wall part than the shape of product
Length direction wire length increase by 0.0002~0.0263%.
In addition, press-processing method of the invention is based on above-mentioned invention, which is characterized in that the convex curve portion
Throughout the length direction overall length of the longitudinal wall part.
In addition, press-processing method of the invention is based on above-mentioned invention, which is characterized in that the convex curve portion
It is a part of the length direction of the longitudinal wall part.
In addition, press-processing method of the invention is based on above-mentioned invention, which is characterized in that the convex curve portion
Compared to the shape of product length direction wire length longitudinal wall part to outside width direction lateral bend.
In addition, press-processing method of the invention is based on above-mentioned invention, which is characterized in that the stamping side
Method includes pressure-sizing process, which has shaped the longitudinal wall part with the convex curve portion in the longitudinal wall forming process
Later, pressure-sizing is carried out in a manner of becoming the length direction wire length of the shape of product to the longitudinal wall part (restrike).
Invention effect
In press-processing method of the invention, shape of product stamping product is formed, the shape of product punching
Pressing formation product are that have along forming height direction convex curved top plate portion and the U word from the continuous longitudinal wall part of the top plate portion
The cross sectional shape of shape or hat, and the bending of the top plate portion is being set as to the radius of curvature of shape of product and by the longitudinal wall
When portion is set as the length direction wire length of shape of product and is formed, wrinkle, the punching are generated in the longitudinal wall part or flange part
In pressing formation method, for the shape of product stamping product to protect the curved radius of curvature of the convex of the top plate portion
It holds and is formed for the radius of curvature of the shape of product without the mode of change, wherein the press-processing method includes into
Shape goes out the longitudinal wall forming process of longitudinal wall part, and the longitudinal wall part has under overlook view along its length to being on the inside of width direction
The convex curve portion that bending and radius of curvature are 5000mm or more, the longitudinal wall forming process make the length of the longitudinal wall part in concave shape
Direction wire length than the shape of product length direction wire length increase by 0.0002~0.0263%, thus in forming process for
The position that blank flows into assigns stretch flange deformation and can offset and shrink flange deformation, is able to suppress the shape of product punching press
The generation of the wrinkle of the flange part of formed products.
Detailed description of the invention
Fig. 1 is the perspective view for indicating the stamping product of press-processing method forming of embodiment 1 through the invention.
Fig. 2 is the three-view drawing for indicating the stamping product of press-processing method forming of embodiment 1 through the invention
(trihedral figure) is the figure indicated by the first horn cupping (first angle projection).
Fig. 3 is the longitudinal wall part for illustrating the stamping product of press-processing method forming of embodiment 1 through the invention
Length direction wire length figure.
Fig. 4 is another stamping product for indicating the press-processing method forming of embodiment 1 through the invention
Top view.
Fig. 5 be indicate the press-processing method of embodiment 1 through the invention another way forming it is stamping
The perspective view of product.
Fig. 6 be indicate the press-processing method of embodiment 1 through the invention another way forming it is stamping
The three-view drawing of product is the figure indicated by the first horn cupping.
Fig. 7 is the flange part for indicating the stamping product of press-processing method forming in embodiment through the invention
Length direction strains the figure (its 1) of the parsing result of (strain).
Fig. 8 is the flange part for indicating the stamping product of press-processing method forming in embodiment through the invention
The figure (its 2) of the parsing result of length direction strain.
Fig. 9 is the convex of the shape of product stamping product for indicating to shape by previous press-processing method in embodiment
The figure of the parsing result of the length direction strain of edge.
Figure 10 is the perspective view for indicating the shape of product stamping product shaped by previous press-processing method.
Figure 11 is the three-view drawing for indicating the shape of product stamping product shaped by previous press-processing method, is logical
Cross the figure of the first horn cupping expression.
Figure 12 is the forming process for the shape of product stamping product that explanation is shaped by previous press-processing method
Explanatory diagram.
Specific embodiment
[embodiment 1]
The press-processing method of embodiments of the present invention 1 is about shape of product stamping product 81, such as Fig. 1 and Fig. 2 institute
Show, the curved radius of curvature of top plate portion 3 is not changed and kept the radius of curvature R of the shape of product0(referring to Fig.1 1)
Shaping and punching formed products 1, the shape of product stamping product 81 in Figure 10 and Figure 11 as an example show have along at
Shape short transverse convex curved top plate portion 83, from the continuous longitudinal wall part 85 of top plate portion 83, from the continuous flange of longitudinal wall part 85
The cross sectional shape of the hat in portion 87 is set as the radius of curvature R of shape of product in the bending by top plate portion 830And longitudinal wall part 85 is set as
The length direction wire length of shape of product and generate wrinkle in flange part 87 when shaping.
Also, the press-processing method of present embodiment 1 includes the longitudinal wall forming process for shaping longitudinal wall part 5, described vertical
Wall portion 5 has under overlook view along its length to curved radius of curvature 5000mm or more in concave shape on the inside of width direction
Convex curve portion 9, the longitudinal wall forming process make the length direction wire length of longitudinal wall part 5 than the length direction line of the shape of product
It is long to increase by 0.0002~0.0263%.
Here, convex curve portion 9 shown in FIG. 1 spreads the length direction overall length of longitudinal wall part 5.Moreover, having convex curve
The length direction wire length of the longitudinal wall part 5 in portion 9 no matter longitudinal wall part 5 forming height direction it is how all constant in the case where, such as Fig. 3
It (b), can be by the wire length L of the ridgeline 4 between longitudinal wall part 5 and top plate portion 3 shown in1It indicates.In this case, ridgeline 4
Wire length L1The wire length L of ridgeline 84 between the top plate portion 83 and longitudinal wall part 85 of shape of product stamping product 810(referring to Fig. 3
(a)) wire length elongation (the stretch ratio) (=(L for comparing and assigning1-L0)/L0) become 0.0002~0.0263%.
Explanation passes through the press-processing method of present embodiment 1 below, does not change shape of product shown in Figure 10 and Figure 11
The curved radius of curvature R of the convex of stamping product 810, the longitudinal wall part with convex curve portion 9 is being shaped as shown in Figure 1
The reasons why inhibiting the generation of wrinkle in the flange part 7 of 5 stamping product 1.
It is as shape of product stamping product 81 same, along forming height direction convex the cross sectional shape of curved hat
Length direction line long shortening when blank inflow in forming process of the position for being equivalent to longitudinal wall part 5 of stamping product 1, therefore such as
Shown in Fig. 2, flange is shunk by the compressed deformation of the curved circumferencial direction along the convex and deforms S.
In addition, in the continuous flange part 7 of longitudinal wall part 5 with convex curve portion 9, the length direction in forming process
Wire length is elongated, therefore as shown in Fig. 2, by the deformation i.e. stretch flange pulled towards the concave curved circumferencial direction
Deform T.
As a result, in flange part 7, due to shaping contraction flange deformation S with offsetting with stretch flange deformation T-phase, because
This can not change the curved radius of curvature R of the convex of shape of product stamping product 810Ground inhibits the wrinkle of flange part 7
It generates.
It should be noted that about the radius of curvature (5000mm or more) in convex curve portion 9 and the length direction of longitudinal wall part 5
Wire length L1Wire length elongation (=(L1-L0)/L0× 100 [%]) range (0.0002~0.0263%) play inhibition flange
The point for the effect that the wrinkle in portion 7 generate, is verified by aftermentioned embodiment.
Here, in the case where convex curve portion 9 spreads the overall length of longitudinal wall part 5, the width in the length direction center of top plate portion 3
Degree becomes most narrow width.In this way, the width of the most narrow part of the width in the length direction center about top plate portion 3, can be
Formula either with the of same size of the top plate portion 83 of shape of product stamping product 81 or in narrowing, can suitably set.
But in the of same size of the width in the length direction of top plate portion 3 center and top plate portion 83, and the length of longitudinal wall part 5
In the case that the end side in degree direction is equipped with to curved convex curve portion 9 on the outside of width direction, embodiment 2 as be described hereinafter is said
It is bright like that, after having shaped with the longitudinal wall part 5 in convex curve portion 9, can pressure-sizing at making longitudinal wall part 5 become shape of product
Length direction wire length L0Longitudinal wall part 85 shape of product stamping product 81.
It should be noted that above-mentioned explanation be about under overlook view along its length have linear longitudinal wall part
85 shape of product stamping product 81 (Figure 10), shaping endlong has concavity throughout length direction under overlook view
The explanation of the longitudinal wall part 5 of bending section 9, but be not limited to that this.That is, the press-processing method of present embodiment 1 is as another
Example also can be such that shown in such as Fig. 4 (a) with along forming height direction convex curved top plate portion 93 and to width direction
Inside curved longitudinal wall part 95 in concave shape, and the bending of the convex of top plate portion 93 is set as the radius of curvature of shape of product, will be indulged
The flange part 97 of shape of product stamping product 91 that wall portion 95 is set as the length direction wire length of shape of product and shapes generates folding
In the case where wrinkle, as shown in Fig. 4 (b), be formed as the stamping product 11 for shaping longitudinal wall part 15, the longitudinal wall part 15 have along at
Shape short transverse convex curved top plate portion 13 and under overlook view along its length further to recessed on the inside of width direction
The curved convex curve portion 19 in shape ground.
In this case, by being formed as than longitudinal wall part 95 further to curved longitudinal wall part in concave shape on the inside of width direction
15, the length direction wire length of longitudinal wall part 15 can be made to increase than the length direction wire length of longitudinal wall part 95.Therefore, in forming process
The stretch flange deformation T for being equivalent to the position of flange part 17 increases, and is able to suppress the generation of the wrinkle of flange part 17.
In addition, above-mentioned explanation is endlong to be equipped with saying for convex curve portion 9 (Fig. 2) throughout the length direction of longitudinal wall part 5
It is bright, but the another way of the press-processing method as present embodiment 1, it such as Fig. 5 and shown in fig. 6 can also strike out
Shape product 21 like that, shape the convex curve portion that a part in length direction both ends side has radius of curvature 5000mm or more
29 longitudinal wall part 25.
Also, the range that convex curve portion 29 is arranged is set as 1/4~1/1 from the length direction both ends of longitudinal wall part 25
Range (being 1/8~1/2 range of overall length about each convex curve portion 29).Moreover, the range in setting convex curve portion 29
It can be set as along its length symmetrical.
In this way, in the stamping product 21 that the length direction both ends side of longitudinal wall part 25 has convex curve portion 29,
It is the length direction wire length L of the longitudinal wall part 25 of the ridgeline 24 between longitudinal wall part 25 and top plate portion 232It is struck out than shape of product
The length direction wire length L of the shape of product of the longitudinal wall part 85 (Figure 10) of shape product 810Increase.Therefore, as shown in fig. 6, shaping
The contraction flange deformation S at the position of longitudinal wall part 25 and the stretch flange deformation T at the position for being equivalent to flange part 27 are equivalent in journey
Shape stamping product 21 with offseting.As a result, the product shape of the convex curvature in forming height direction can not be changed
The radius of curvature R of shape0(referring to Fig. 6 and Figure 11) and the generation for inhibiting the wrinkle of flange part 27.
In addition, in the stamping product 21 that the length direction both ends side of longitudinal wall part 25 has convex curve portion 29, it will
The width of the top plate portion 23 in length direction center remains the width of the top plate portion 83 of shape of product, makes convex curve portion 29 than producing
The length direction wire length L of product shape0Longitudinal wall part 85 to outside width direction lateral bend, thus said in embodiment 2 as be described hereinafter
It is bright shape the longitudinal wall part 25 with convex curve portion 29 like that after, can pressure-sizing at making longitudinal wall part 25 be configured to shape of product
Length direction wire length L0Longitudinal wall part 85 shape of product stamping product 81.
In addition, above-mentioned explanation is the explanation about the stamping product of the cross sectional shape with hat, but this implementation
The press-processing method of mode 1 is readily applicable to have along forming height direction convex curved top plate portion and from the top plate
The cross sectional shape of the U-shaped of the continuous longitudinal wall part in portion.
Even if in this case, making have the length direction wire length of the longitudinal wall part in the convex curve portion than the product shape
The length direction wire length of shape increases by 0.0002~0.0263%, thus in forming process the upper end side of longitudinal wall part length direction
Wire length is elongated and becomes stretch flange and deforms, therefore the contraction flange deformation that will be equivalent to the lower end side at the position of longitudinal wall part is supported
Disappear, is able to suppress the generation of the wrinkle of longitudinal wall part.
It should be noted that as long as the longitudinal wall forming process of the press-processing method of present embodiment 1 can shape
The longitudinal wall part 5 in convex curve portion 9 with Fig. 1 and as shown in Figure 2, is not limited in crash forming or stretch forming
Any one.
[embodiment 2]
The press-processing method of embodiment 1 above-mentioned is the longitudinal wall part 5 in order to make stamping product 1 shown in FIG. 1
Length direction wire length slightly increases and makes its curved method in concave shape, therefore is the shape to shape of product stamping product 81
It carries out a little change and carries out stamping method.
Therefore, the stamping product 1 that present embodiment 2 shapes the press-processing method using embodiment 1 into
Row pressure-sizing and it is stamping therefore to be explained below closer to the shape of shape of product stamping product 81.
The press-processing method of present embodiment 2 includes pressure-sizing process, which shapes in the longitudinal wall of embodiment 1
After shaping the longitudinal wall part 5 with convex curve portion 9 as shown in Figure 1 in process, pressure-sizing is the length side for shaping longitudinal wall part 5
To wire length be shape of product length direction wire length longitudinal wall part 85 shape of product stamping product 81 (referring to Fig.1 0 and figure
11)。
Here, pressure-sizing is carried out to stamping product 1 in pressure-sizing process, therefore in longitudinal wall forming process, concavity is curved
Pars convoluta 9 is formed as compared with as the longitudinal wall part 85 of the shape of product stamping product 81 of shaped objects shape under overlook view
The lateral bend to outside width direction along its length.In this case, the top plate portion 3 of stamping product 1 length direction center
As long as width remains the width of the top plate portion 83 of shape of product stamping product 81.
It, can also be with as shown in figure 5, shape longitudinal wall part 25 alternatively, in the longitudinal wall forming process of present embodiment 2, it should
Longitudinal wall part 25 is set as the longitudinal wall part with shape of product stamping product 81 in the length direction center of top plate portion 23 and longitudinal wall part 25
85 identical shapes, and the both ends side of the length direction of longitudinal wall part 25 has to curved convex curve portion on the outside of width direction
29。
2 press-processing method according to the present embodiment will be shaped in longitudinal wall forming process with convex curve portion
Longitudinal wall part stamping product shaped as intermediate formed products (preformed part) after, pressure-sizing at as at
The shape of shape target, thus in longitudinal wall forming process inhibit flange part wrinkle generation, therefore with using a process come
Generation of the case where stamping product of formed product shape compared to the wrinkle for being able to suppress flange part can strike out in turn
Shape is the shape closer to the shape of product stamping product as shaped objects.
In addition, same as above-mentioned embodiment 1, the press-processing method of present embodiment 2 can also be by following punching press
For formed products as object, the stamping product is with along forming height direction convex curved top plate portion and from the top plate
The stamping product of the cross sectional shape of the U-shaped of the continuous longitudinal wall part in portion.
Embodiment 1
Function and effect about press-processing method of the invention have carried out the verifying for confirmation, thus below to this into
Row explanation.
In embodiment 1, about the cross sectional shape to along forming height direction convex curved hat shown in FIG. 1
Stamping product 1 carries out the process of crash forming, is carried out by Finite element method parsing (finite element analysis)
Simulation, the wrinkle for having discussed the flange part 7 of stamping product 1 inhibit.
Stamping product 1 as shaped object is the curved radius of curvature R in forming height direction0=1000mm, at
The cross sectional shape of the hat of shape height 40mm, punch shoulder radius (shoulder radius) 8mm, punch die shoulder radii 8mm,
Blank used in stamping is strength of materials 1180MPa grades, plate thickness (sheet thickness) 1.2mm.Also, pass through
Parsing finds out the plate thickness increment rate (increasing rate) and strain of flange part 7, has rated the inhibitory effect of wrinkle.
Also, in embodiment 1, do not change forming height direction curved radius of curvature and forming height and will as figure
The endlong stamping product 1 equipped with convex curve portion 9 of the length direction of longitudinal wall part 5 is spread shown in 1 and is existed as shown in Figure 5
The stamping product 21 that the length direction both ends of longitudinal wall part 25 are equipped with convex curve portion 29 is used as example.
The radius of curvature in the convex curve portion 9 and 29 of example changes in the range of 5000mm~50000mm,
The convex curve portion 29 of the length direction both ends side setting of stamping product 21 makes the length direction for being combined both sides
Length changes in the range of 1/4~1.When the radius of curvature in convex curve portion 9 is less than 5000mm, with shape of product phase
Become problem than deviating from larger, moreover, being difficult to become shape of product pressure-sizing, therefore the radius of curvature is set as
5000mm or more.It should be noted that the radius of curvature in convex curve portion 9 and 29 passes through the forming to stamping product 1 and 21
The length direction of used formed punch and punch die assigns defined radius of curvature to set.
In addition, in the present embodiment, the shape of product stamping product that longitudinal wall part 85 will be bent in concave shape and shaped
81 are used as conventional example, and the plate thickness increment rate of flange part 87 and the result of strain have been found out in the same manner as example.
Firstly, showing the result of the strain of stamping product generation.Fig. 7~Fig. 9 shows the length of example and conventional example
The parsing result of direction Strain Distribution.Fig. 7 (b) is as example, and shape endlong has concavity curved throughout length direction
The length direction of the stamping product 1 of the longitudinal wall part 5 (wire length elongation 0.0263%) of pars convoluta 9 (radius of curvature 5000mm) strains
Distribution is the figure that the region surrounded about the dotted line as shown in Fig. 7 (a) is shown.Fig. 8 (b) is shaped as example
There is 29 (radius of curvature of convex curve portion in the range of the both ends side of length direction is in the 3/4 of length direction overall length
The length direction Strain Distribution of the stamping product 21 of longitudinal wall part 25 (wire length elongation 0.0259%) 5000mm), be about
The figure that the region that dotted line shown in Fig. 8 (a) surrounds is shown.Fig. 9 (b) is not make longitudinal wall part 85 in concave shape as conventional example
Bending and the length direction wire length of shape of product is set as L0The length direction for the shape of product stamping product 81 that ground shapes is answered
Variation cloth is the figure that the region of the encirclement of the dotted line shown in Fig. 9 (a) is shown.
Compared with the flange part 87 of conventional example shown in Fig. 9, in Fig. 7 and example shown in Fig. 8, flange part 7 or convex
The length direction of edge 27 strains the biggish value being negative, that is, compression strain (compressive strain) significantly generates
Region (region that dotted line in Fig. 7 (b), Fig. 8 (b) and Fig. 9 (b) surrounds) constriction.As a result, in example, imply that convex
The case where generation of the wrinkle of edge 7 and flange part 27 is inhibited compared with the flange part 87 of conventional example.
Next, showing the result of the plate thickness of flange part.Table 1 endlong has concavity about shaping throughout length direction
The stamping product 1 of the longitudinal wall part 5 of bending section 9, show by the radius of curvature in convex curve portion 9 5000~50000mm model
Enclose the result of the plate thickness increment rate of interior flange part 7 when being changed (example 1~5).Moreover, not making 85 concavity of longitudinal wall part
Ground is bent and the result of the plate thickness increment rate of the flange part 87 of the shape of product stamping product 81 (conventional example 1) of forming exists together
It is shown in table 1.It should be noted that plate thickness increment rate is the plate thickness of flange part length direction central portion and flange part width direction
Maximum value (substantially adjacent to the position in flange part center).
[table 1]
(table 1)
According to table 1, the plate thickness increment rate of conventional example 1 is 11.8%, but the plate thickness increment rate of example 1~5 be 2.3~
4.9%, all radius of curvature all become the value lower than conventional example 1.In addition, becoming in example 1~5 with curvature half
Diameter falls to the result of the plate thickness increment rate decline of 5000mm and flange part 7 from 50000mm.
According to above-mentioned as a result, making endlong have the concavity of 5000~50000mm of radius of curvature curved throughout length direction
The length direction wire length of the longitudinal wall part 5 of pars convoluta 9 increases in the range of 0.0002~0.0263% and is shaped, and thus shows suppression
The case where wrinkle of flange part 7 processed.In addition, showing, in the range of radius of curvature 5000mm~50000mm, pass through reduction
The case where inhibitory effect of radius of curvature and the wrinkle of flange part 7 improves.
Table 2 about shape the both ends side of length direction have convex curve portion 29 longitudinal wall part 25 it is stamping
The radius of curvature in convex curve portion 29 is set as 5000mm or 10000mm by the plate thickness increment rate of the flange part 27 of product 21, display, will
The setting range in convex curve portion 29 changes (example 11~18) in the range of the 1/4~4/4 of length direction overall length
When result.Moreover, same as table 1, the shape of product stamping product 81 for being bent longitudinal wall part 85 in concave shape and shaping is (existing
Have example 1) the result of plate thickness increment rate of flange part 87 be shown in Table 2 below together.
[table 2]
(table 2)
According to table 2, the plate thickness increment rate of example 11~18 its absolute value compared with the plate thickness increment rate of conventional example 1 is low
Value, be the state for being difficult to generate wrinkle.In addition, by the identical condition of the setting range in convex curve portion 29 (example 11 with
Example 15, example 12 and example 16, example 13 and example 17, example 14 and example 18) when being compared,
Compared with the radius of curvature in convex curve portion 29 is the example 15~18 of 10000mm, the radius of curvature in convex curve portion 29 is
The plate thickness increment rate of the example 11~14 of 5000mm is low value.
In addition, the example 11~14 and example 15~18 equal respectively for the radius of curvature in convex curve portion 29,
It is the increase of the setting range with convex curve portion 29 and plate thickness when setting range about convex curve portion 29 is compared
The result of the absolute value decline of increment rate.
According to this as a result, even if a part in the both ends side for shaping length direction has the lateral bending to outside width direction
In the case where the longitudinal wall part 25 in bent convex curve portion 29, the radius of curvature in convex curve portion 29 is set as 5000mm or more, is made
The length direction wire length of longitudinal wall part 5 increases in the range of 0.0002~0.0263%, to be shown to inhibit flange part
27 wrinkle and the case where be formed.In addition, showing flange part 27 by increasing the range that convex curve portion 29 is arranged
Wrinkle inhibitory effect improve the case where.
Embodiment 2
In example 2, about along forming height direction convex curved top plate portion and from the continuous U of the top plate portion
The stamping product of the cross sectional shape of font, it is same as embodiment 1 above-mentioned, for making longitudinal wall part under overlook view along length
Direction is bent and the process of crash forming in concave shape to width direction inside, is simulated, is discussed using Finite element method parsing
The inhibition that the wrinkle of the longitudinal wall part generate.
It is stamping used in blank similarly to Example 1, the strength of materials (tensile strength) 1180MPa
Grade, plate thickness 1.2mm and as the stamping product of shaped object be forming height direction curved radius of curvature R0=
The cross sectional shape of the hat of 1000mm, forming height 40mm, punch shoulder radius 8mm, punch die shoulder radii 8mm.Also, pass through
Parsing finds out the plate thickness increment rate and strain of longitudinal wall part, has rated the inhibitory effect of the wrinkle of longitudinal wall part.
In example 2, the curved radius of curvature for not changing forming height direction and forming height are shaped
The overall length of the length direction of longitudinal wall part has the stamping product of the longitudinal wall part in convex curve portion as example 21, has found out vertical
The plate thickness increment rate of wall portion.Here, the radius of curvature in convex curve portion is 5000mm, made by the forming to stamping product
The length direction of formed punch and punch die assigns defined radius of curvature to set.
In addition, in example 2, will not make longitudinal wall part curved in concave shape in the stamping product of the cross sectional shape of U-shaped
Bent and forming structure is as conventional example 2, the simulation forming process in the same manner as example 21, and the plate thickness for having found out longitudinal wall part increases
Rate.
Table 3 shows the plate thickness of longitudinal wall part when shaping throughout the longitudinal wall part that length direction overall length has convex curve portion
The result of increment rate.Moreover, as comparison other, show is bent longitudinal wall part in concave shape and the conventional example 2 that shapes together
The result of plate thickness increment rate.
[table 3]
(table 3)
According to table 3, the plate thickness increment rate of conventional example 2 is 5.5%, but the plate thickness increment rate of example 21 is 1.6%,
Absolute value decline.According to as a result, be bent along forming height direction convex and the cross sectional shape of U-shaped it is stamping
In product and the radius of curvature in convex curve portion is 5000mm, and the length direction overall length shaped throughout longitudinal wall part overlooks sight
The lower longitudinal wall part to width direction inside with convex curve portion of the radius of curvature for 5000mm is examined, by the length for making the longitudinal wall part
It spends direction wire length to increase in the range of 0.0002~0.0263%, is shown to the wrinkle for inhibiting longitudinal wall part and the feelings shaped
Condition.
Embodiment 3
In embodiment 3, using the following process of Finite element method analytic simulation, i.e., will have throughout length direction endlong
The stamping product 1 (referring to Fig.1) of longitudinal wall part 5 with convex curve portion 9 or the both ends of the length direction in longitudinal wall part 25
It, will after there is a part of portion side the stamping product 21 in convex curve portion 29 to have carried out crash forming as intermediate formed products
The longitudinal wall part 5 or longitudinal wall part 25 of the intermediate formed products are configured to the product shape of the longitudinal wall part 85 of the length direction wire length of shape of product
81 pressure-sizing of shape stamping product is the process of shaped objects shape, shape of product stamping product 81 after having discussed pressure-sizing it is convex
The inhibitory effect of the wrinkle of edge 87.
Shape of product stamping product 81 (referring to Fig.1 0) as shaped object is the curved song in forming height direction
Rate radius R0The section shape of the hat of=1000mm, forming height 40mm, punch shoulder radius 8mm, punch die shoulder radii 8mm
Shape.Here, blank used in stamping and embodiment 1 and embodiment 2 are similarly 1180MPa grades of the strength of materials, plate thickness
1.2mm.Also, it finds out and the stamping product 1 and stamping product 21 that shape as intermediate formed products has been subjected to essence respectively
The plate thickness increment rate of the flange part 87 of shape of product stamping product 81 after pressure, has rated the inhibition of the wrinkle of flange part 87
Effect.
Table 4 has carried out the product of pressure-sizing about by the stamping product 1 for shaping the longitudinal wall part 5 with convex curve portion 9
The plate thickness increment rate of the flange part 87 of shape stamping product 81 is shown the curvature in the convex curve portion 9 of stamping product 1 half
Diameter is changed result when (example 31~35) in the range of 5000mm~50000mm.Moreover, not making longitudinal wall part 85
It is bent and is increased using the plate thickness of the flange part 87 of the shape of product stamping product 81 (conventional example 1) of 1 process forming in concave shape
The result of rate is added to be shown in table 4 together.
[table 4]
(table 4)
According to table 4, the radius of curvature in convex curve portion 9 is 5000~50000mm in the range of no matter radius of curvature
How is value, all becomes the result that plate thickness increment rate falls to less than half compared with conventional example 1.As a result, make stamping product 1
It is shape of product stamping product 81 by the intermediate formed products pressure-sizing for intermediate formed products, is thus shown to inhibit flange
The wrinkle in portion 87 and the case where be formed, the stamping product 1 is curved in concave shape by making to have throughout length direction overall length
Bent and radius of curvature be the longitudinal wall part 5 in the convex curve portion 9 of 5000~50000mm length direction wire length 0.0002~
Increase in the range of 0.0263% and shapes.
Table 5 in the both ends side of length direction there is the longitudinal wall part 25 in convex curve portion 29 to strike out about will shape
Shape product 21 have carried out the plate thickness increment rate of the flange part 87 of the shape of product stamping product 81 of pressure-sizing, show stamping product 21
Convex curve portion 29 radius of curvature be 5000mm or 10000mm and by the setting range in convex curve portion 29 in length direction
Result when (example 41~48) is changed in the range of the 1/4~4/4 of overall length.Moreover, not making 85 concavity of longitudinal wall part
Ground bending and the plate thickness of the flange part 87 of shape of product stamping product 81 (conventional example 1) shaped using 1 process are increased
The result of rate is shown in table 5 together.
[table 5]
(table 5)
According to table 5, no matter which curvature range (5000mm, 10000mm) and convex curve portion 29 setting range (1/
4~4/4) in, compared with conventional example 1, the plate thickness increment rate of the flange part 87 of the shape of product stamping product 81 after pressure-sizing
All decline.In addition, in 2/4 example 42 and example 46 that convex curve portion 29 is set as length direction overall length, with
The example 41 and example 45 that convex curve portion 29 is set as the 1/4 of length direction overall length are significantly compared to plate thickness increment rate
Decline, in 3/4 or more the example 43,44,47 and 48 for being set as length direction overall length, is not observed in plate thickness increment rate
Biggish variation.
According to as a result, thus showing that the shape of product of pressure-sizing is stamping for the progress pressure-sizing of stamping product 21
The case where wrinkle of the flange part 87 of product 81 are inhibited, the stamping product 21 is by making in the both ends side of length direction
The length direction wire length of the longitudinal wall part 25 in the convex curve portion 29 with radius of curvature 5000mm or more 0.0002~
Increase in the range of 0.0263% and shapes.In addition, by by convex curve portion 29 be set as length direction wire length 2/4 (=
1/2) range more than shows the inhibition of the wrinkle of the flange part 87 of the shape of product stamping product 81 for pressure-sizing very
Effective situation.
Industrial applicibility
In accordance with the invention it is possible to a kind of press-processing method be provided, about along forming height direction convex curved U
The stamping product of the cross sectional shape of font or hat carries out punching press with being able to suppress the generation of the wrinkle of longitudinal wall part or flange part
Forming.
Label declaration
1 stamping product
3 top plate portions
5 longitudinal wall parts
7 flange parts
9 convex curve portions
11 stamping products
13 top plate portions
15 longitudinal wall parts
17 flange parts
19 convex curve portions
21 stamping products
23 top plate portions
25 longitudinal wall parts
27 flange parts
29 convex curve portions
61 molds
63 formed punches
65 punch dies
71 blanks
71a blank end
81 shape of product stamping products
83 top plate portions
85 longitudinal wall parts
87 flange parts
91 shape of product stamping products
93 top plate portions
95 longitudinal wall parts
97 flange parts.
Claims (5)
1. shape of product stamping product is formed in a kind of press-processing method, the shape of product stamping product is
With along forming height direction convex curved top plate portion and from the "U" font or hat of the continuous longitudinal wall part of the top plate portion
Cross sectional shape, and the bending of the top plate portion is being set as the radius of curvature of shape of product and is being set as producing by the longitudinal wall part
The length direction wire length of product shape and when being formed, the shape of product stamping product is produced in the longitudinal wall part or flange part
Raw wrinkle, in the press-processing method, for the shape of product stamping product with by the curved of the convex of the top plate portion
The radius of curvature that bent radius of curvature remains the shape of product is formed without the mode of change, the stamping side
Method is characterized in that,
The press-processing method includes the longitudinal wall forming process for shaping longitudinal wall part, and the longitudinal wall part has under overlook view
It is bent concavely to width direction inside along its length and radius of curvature is the convex curve portion of 5000mm or more,
The longitudinal wall forming process increases the length direction wire length of the longitudinal wall part than the length direction wire length of the shape of product
0.0002~0.0263%.
2. press-processing method according to claim 1, which is characterized in that
The convex curve portion spreads the length direction overall length of the longitudinal wall part.
3. press-processing method according to claim 1, which is characterized in that
The convex curve portion is a part of the length direction of the longitudinal wall part.
4. press-processing method according to claim 2 or 3, which is characterized in that
The convex curve portion compared to the shape of product length direction wire length longitudinal wall part to outside width direction lateral bend.
5. press-processing method according to claim 4, which is characterized in that
The press-processing method includes pressure-sizing process, which has shaped in the longitudinal wall forming process with described
After the longitudinal wall part in convex curve portion, essence is carried out in a manner of becoming the length direction wire length of the shape of product to the longitudinal wall part
Pressure.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-012642 | 2017-01-27 | ||
| JP2017012642A JP6330930B1 (en) | 2017-01-27 | 2017-01-27 | Press forming method |
| PCT/JP2017/040270 WO2018139000A1 (en) | 2017-01-27 | 2017-11-08 | Press forming method |
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| CN110087791A true CN110087791A (en) | 2019-08-02 |
| CN110087791B CN110087791B (en) | 2020-12-11 |
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| JP (1) | JP6330930B1 (en) |
| KR (1) | KR102215972B1 (en) |
| CN (1) | CN110087791B (en) |
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| JP6870672B2 (en) * | 2018-11-06 | 2021-05-12 | Ｊｆｅスチール株式会社 | Press molding method |
| JP6677289B1 (en) * | 2018-12-12 | 2020-04-08 | Ｊｆｅスチール株式会社 | Press molding method |
| MX2021012210A (en) * | 2019-04-10 | 2021-11-03 | Nippon Steel Corp | Blank and component. |
| JP6733772B1 (en) * | 2019-04-22 | 2020-08-05 | Ｊｆｅスチール株式会社 | Press molding method |
| JP6733773B1 (en) * | 2019-04-22 | 2020-08-05 | Ｊｆｅスチール株式会社 | Press molding method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011206789A (en) * | 2010-03-29 | 2011-10-20 | Kobe Steel Ltd | Press forming method |
| CN104918725A (en) * | 2013-01-16 | 2015-09-16 | 新日铁住金株式会社 | Press-molding method |
| CN105358269A (en) * | 2013-06-27 | 2016-02-24 | 杰富意钢铁株式会社 | Press forming method and press forming device |
| CN105555432A (en) * | 2013-09-20 | 2016-05-04 | 新日铁住金株式会社 | Press molded product, press molded product manufacturing method, and press molded product manufacturing device |
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| JP2002001445A (en) * | 2000-06-16 | 2002-01-08 | Fuji Heavy Ind Ltd | Press forming method |
| JP2008189126A (en) * | 2007-02-05 | 2008-08-21 | Kobe Steel Ltd | Structural member |
| JP2010227995A (en) | 2009-03-30 | 2010-10-14 | Kobe Steel Ltd | Method of forming curved channel member |
| KR101663433B1 (en) | 2012-12-19 | 2016-10-06 | 신닛테츠스미킨 카부시키카이샤 | Press-forming mold and method for manufacturing press-formed product |
| JP6036768B2 (en) * | 2013-10-25 | 2016-11-30 | Ｊｆｅスチール株式会社 | Press forming method |
| BR112016012725A2 (en) * | 2013-12-26 | 2017-08-08 | Nippon Steel & Sumitomo Metal Corp | PRODUCTION METHOD OF A HAT-SHAPED CROSS-SECTION COMPONENT |
| JP5967386B2 (en) | 2014-12-03 | 2016-08-10 | Ｊｆｅスチール株式会社 | Press molding method, component manufacturing method using the method, and press molding apparatus |
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- 2017-11-08 WO PCT/JP2017/040270 patent/WO2018139000A1/en active Application Filing
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011206789A (en) * | 2010-03-29 | 2011-10-20 | Kobe Steel Ltd | Press forming method |
| CN104918725A (en) * | 2013-01-16 | 2015-09-16 | 新日铁住金株式会社 | Press-molding method |
| CN105358269A (en) * | 2013-06-27 | 2016-02-24 | 杰富意钢铁株式会社 | Press forming method and press forming device |
| CN105555432A (en) * | 2013-09-20 | 2016-05-04 | 新日铁住金株式会社 | Press molded product, press molded product manufacturing method, and press molded product manufacturing device |
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| JP2018118290A (en) | 2018-08-02 |
| KR20190077026A (en) | 2019-07-02 |
| KR102215972B1 (en) | 2021-02-15 |
| WO2018139000A1 (en) | 2018-08-02 |
| CN110087791B (en) | 2020-12-11 |
| JP6330930B1 (en) | 2018-05-30 |
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