CN107921504A - The manufacture method of stretch flange formation of parts - Google Patents
The manufacture method of stretch flange formation of parts Download PDFInfo
- Publication number
- CN107921504A CN107921504A CN201680049697.9A CN201680049697A CN107921504A CN 107921504 A CN107921504 A CN 107921504A CN 201680049697 A CN201680049697 A CN 201680049697A CN 107921504 A CN107921504 A CN 107921504A
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- bending
- flange
- punch
- outer peripheral
- peripheral edge
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000005452 bending Methods 0.000 claims abstract description 117
- 230000002093 peripheral effect Effects 0.000 claims abstract description 68
- 230000008439 repair process Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 abstract description 30
- 238000009740 moulding (composite fabrication) Methods 0.000 description 48
- 239000000463 material Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 231100000241 scar Toxicity 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 241001442589 Convoluta Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
Classifications
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- 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
-
- 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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Punching Or Piercing (AREA)
Abstract
The stretch flange formation of parts for shaping and manufacturing with stretch flange is suppressed into stretch flange rupture and is manufactured with low shaping load.It is the manufacture method for manufacturing stretch flange formation of parts, which possesses：Top plate portion (3) with the first concavity outer peripheral edge portion (3a)；It is connected with longitudinal wall part (5) and is rolled over to top plate portion (3) lateral bending and there is the flange part (7) of the second concavity outer peripheral edge portion (7a).Possesses following process：For blank, the first step of bending shape portion (8) is formed in the outside of the position as flange part (7), the crest line (9) of bending shape portion (8) extends along the second concavity outer peripheral edge portion (7a) and bent along thickness of slab direction；After the first step, the position for becoming top plate portion (3) is fixed and the second step of bending forming is carried out to longitudinal wall part (5) and above-mentioned flange part (7)；And the third step repaired to the outside left of flange part (7).
Description
Technical field
The present invention relates to by having a part for outer peripheral edge hollowly curved concavity outer peripheral edge inwardly in top plate portion
Portion, the technology of the stretch flange formation of parts of flange part is manufactured to manufacture with stretch flange shaping.As such drawing
Flange formation of parts is stretched, may be exemplified the stamping part for example used as the body frame part of automobile, and bowing
Depending on observing the lower part with L-shaped shape portion or T-shaped portion.The present invention is particularly suited for strong with the superelevation of more than 980MPa
Degree material passes through the technology of stamping situation about being manufactured for raw material.
Background technology
There is L-shaped shape portion or T-shaped as the front pillar reinforcer of the body frame part of automobile or center pillar stiffener etc.
The part (with reference to Fig. 6 and Fig. 7) in shape portion from flat metallic plate (blank) by stamping manufactured when, generally use
Drawing and forming or bending forming.
Drawing and forming is carried out usually using the mould that is made of punch, punch die and charge support, using punch die and
In the state of charge support around metallic plate to pressing, make the distance between punch and punch die close and real to metallic plate
The method for applying drawing process.Moreover, bending forming is carried out usually using the mould being made of punch, pad and punch die, in profit
In the state of punch and pad clamping metallic plate, by making punch die relative movement implement the method for bending machining.
Only pass through drawing as described above as bending sections such as the L-shaped shape portion of drastically curved shape or T-shaped portions
When shaping is to shape, longitudinal wall part is higher, then easier to produce rupture or fold etc..Especially in recent years, in order to realize Automobile
The security of body improves and lightweight, and the intensity of the metallic plate in the shaping raw material as body of a motor car is increasingly elevated to incline
To.The metallic plate of such high intensity can not expect the ductility soft steel plate that used in the past as, therefore for striking out
The countermeasure of rupture and fold during shape is most important.
The above-mentioned position for being particularly easy to produce rupture due to stamping is the stretch flange forming section of bending section.
The position, in drawing and forming, become make material end face peripherally direction extension on one side make material inflow deformation state.
In contrast, there are the technology that patent document 1 is recorded.The technology that the patent document 1 is recorded is to L-shaped shape
Part carry out it is stamping when, while making a part for raw metal on the position corresponding with top plate portion in punching die
Slide, while shaping longitudinal wall part and flange part.
Also, the patent document 1 describes following situation：By L-shaped shape portion position direction corresponding with L words following side
Longitudinal wall part pulls in, therefore mitigates the situation that excessive stretching is produced in flange part, and the generation of rupture can be prevented (with reference to patent text
Offer 1 numbered paragraphs 0009).
Citation
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2012-245536 publications
The content of the invention
The subject that the invention solves
However, in patent document 1, make to slide with the raw metal at a part of suitable position of top plate portion, therefore
The end face of raw metal produces the position of stress concentration.As a result, in patent document 1, except the stretch flange of bending section
Outside rupture, the rupture of end face is also easily produced.Therefore, the method for patent document 1 is difficult to be suitable for the high steel plate of intensity.
In addition, drawing and forming due to shaping load raise, want only by drawing and forming come manufacture 980MPa with
On ultrastrength material raw material when, in drawing and forming, the load deficiency of press machine may become problem.
Made currently invention addresses the above subject, will shape and make with stretch flange its purpose is to provide one kind
The stretch flange formation of parts made can suppress stretch flange rupture and the stretch flange formation of parts manufactured with low shaping load
Manufacture method.
Solutions to solve the problem
In order to solve problem, the manufacture method of the stretch flange formation of parts of a form of the invention is convex for manufacturing stretching
Edge formation of parts, the stretch flange formation of parts possess：Top plate portion, a part with outer peripheral edge are hollowly bent inwardly
Concavity outer peripheral edge portion；Longitudinal wall part, is connected with the concavity outer peripheral edge portion of the top plate portion；And flange part, connect with the longitudinal wall part
Connect and rolled over to the top plate portion lateral bending, the manufacture method of the stretch flange formation of parts is characterized in that possessing following process：
The first step, for blank, place forms bending shape portion, the bending shape in the outer part than the position as the flange part
The crest line in portion extends along the position of the outer peripheral edge portion as the flange part and is bent along thickness of slab direction；The second step, in institute
After stating the first step, the longitudinal wall part and the flange part are bent to by being fixed as the position of the top plate portion
Shape；And the third step, after the second step, the position in the outside of the flange part is repaired.
Invention effect
Form according to the present invention, in the first step, to surround the outer of the easy flange part for producing stretch flange rupture
The mode of peripheral part pre-sets bending shape portion, thus, even if assuming that superelevation more than 980MPa grades of use intensity grade is strong
Material is spent, can also suppress the stretch flange rupture during bending forming in the second step.
In addition, the present invention form in, longitudinal wall part is processed by drawing and forming, but by bending forming come
Shaping, therefore can be manufactured with low shaping load.
Situation due to more than, form according to the present invention, even if assuming by 980MPa grades of superelevation above of strength grade
In the case that strength materials manufacture stretch flange formation of parts with stretch flange shaping, it can also suppress stretch flange rupture
And manufactured with low shaping load.
Here, above-mentioned flange part is connected via longitudinal wall and with the first concavity outer peripheral edge portion of top plate portion, relative to longitudinal wall part
Roll over to top plate portion lateral bending, therefore shaped when based on stamping manufacture with stretch flange.
In addition, as moulding material it is stamping before raw sheet (blank) usually using punch press process or Laser Processing come
Formed, therefore burr or small scar etc. are remained in material end face, become and easily produce locality when being applied with deformation
Stress concentration state.Therefore, way produces the cracking for being known as stretch flange rupture in formation on material end face, in superelevation
In the case of strength materials (strength grade is 980MPa grades of high-strength steel sheets above), which rapidly propagates and easily produces
Big rupture.
Countermeasure is ruptured as stretch flange, there is also end face is equably finished by mechanical processing etc. to prevent
The method of stress concentration, but, it is necessary to be held to each product in the case of stamping to batch production product progress
The mechanical processing in face.
Therefore, in the form of the present invention, the outside left of flange part is repaired after the second step, is shaped convex
The outer peripheral edge of edge, at the same time, removes the bending shape portion set to suppress above-mentioned stretch flange rupture.
Brief description of the drawings
Fig. 1 is the stereogram for the example for illustrating the stretch flange formation of parts based on embodiments of the present invention.
Fig. 2 is the stereogram for the blank for illustrating the subsidiary bending shape portion based on embodiments of the present invention.
Fig. 3 is the schematic diagram for the example for representing the bending shape portion based on embodiments of the present invention.
Fig. 4 is the solid for including a part of section of the mould used in the second step based on embodiments of the present invention
Figure.
Fig. 5 is the explanatory drawin of the second step based on embodiments of the present invention.
Fig. 6 is the figure for representing A columns.
Fig. 7 is the figure for representing center pillar.
Embodiment
Next, referring to the drawings, illustrate embodiments of the present invention.
In the present embodiment, it is listed below exemplified by situation and illustrates：Use more than 980MPa grades superhigh intensity materials
Expect to manufacture the stretch flange shaping with the position as stretch flange forming section as stamping preceding raw sheet (blank)
Part.Even the manufacturing method of the present invention can be also applicable in by the raw material that the metallic plate that intensity is below 980MPa is formed.
It should be noted that as the flange formation of parts with the position as stretch flange forming section, example can be enumerated
Such as A columns (with reference to Fig. 6) or center pillar (with reference to Fig. 7).
In addition, following, the portion for including the position as stretch flange forming section being conceived in stretch flange formation of parts
Divide and illustrate, only illustrate the part in the various figures.Also, the part is known as " stretch flange forming section 1 ".Need what is illustrated
It is also only to illustrate the position for shaping the position in a mold.Certainly others position can also shape at the same time.
As shown in Figure 1, have using the stretch flange forming section 1 that the manufacture method of present embodiment manufactures：Top plate portion 3,
A part with outer peripheral edge hollowly curved concavity outer peripheral edge portion 3a inwardly；Longitudinal wall part 5, along the concavity of top plate portion 3
Outer peripheral edge portion 3a shapes；And flange part 7, have be connected with longitudinal wall part 5 and to 3 lateral bending of top plate portion folding and outer peripheral edge a part to
Inner side hollowly curved concavity outer peripheral edge portion 7a.Also, flange part 7 is as the portion of stretch flange shaping when stamping
Position.It should be noted that the shape of the outer peripheral edge of flange part 7 need not be hollowly curved shape, but it is generally increased by work
Into the shape along concavity outer peripheral edge portion 3a.
Here, in the present embodiment, the concavity outer peripheral edge portion 3a of top plate portion 3 is also referred to as the first concavity outer peripheral edge portion
3a, the second concavity outer peripheral edge portion 7a is also referred to as by the concavity outer peripheral edge portion 7a of flange part 7.The wheel of first concavity outer peripheral edge portion 3a
Profile shape usually becomes consistent or similar contour shape to the contour shape of the second concavity outer peripheral edge portion 7a.Certainly, first is recessed
The curved curvature shapes of the contour shape of shape outer peripheral edge portion 3a are curved with the contour shape of the second concavity outer peripheral edge portion 7a
Each curvature shapes can not also be same.
Here, curved curve need not be certain curvature, and there is no the curvature precipitous preferably along its extending direction
The precipitous portion of curvature.
The manufacture method of the stretch flange formation of parts of present embodiment possesses the first step, the second step and the third step
These three processes, the processing of shaping is performed according to the process sequence.
In the first step, for stamping preceding flat raw sheet (blank), to the position as flange part 7
Periphery position assigns bending shape portion 8.That is, the first step is the process for the blank for manufacturing the subsidiary bending shape portion shown in Fig. 2.
In fig. 2, the feedstock portions that foreign side is leaned on than bending shape portion 8 are omitted, moreover, becoming using single dotted broken line to illustrate
The position of second concavity outer peripheral edge portion 7a.In other figures, for the ease of observation, also appropriate omission is leaned on than bending shape portion 8
The feedstock portions of foreign side.
In the second step, the first concavity outer peripheral edge portion 3a of top plate portion 3 is formed, and along the first concavity outer peripheral edge portion
3a bending formings longitudinal wall part 5 and flange part 7.That is, the second step is the work using the blank in subsidiary bending shape portion as centre part
Sequence.
In the third step, bending shape portion 8 is repaired out from centre part.That is, the third step is the outer of shaped flange portion 7
Periphery and as the process of above-mentioned stretch flange formation of parts.
Hereinafter, each operation is described in detail.
[the first step]
The first step is for stamping preceding flat raw sheet (blank), as shown in Fig. 2, than as flange part 7
Position outer circumferential side position at form bending shape portion 8.The bending shape portion 8 becomes crest line 9 along the second concavity outer peripheral edge portion
The formation that 7a extends and bent along thickness of slab direction.The bending shape portion 8 of present embodiment is by for example along the ladder of thickness of slab direction bending
The end difference shape of level shape is formed.
Being formed for bending shape portion 8 can be formed by stamping based on punch die and punch, can also pass through it
His processing method is formed.
The height (projecting height in thickness of slab direction) of the step in the bending shape portion 8 of shaping is preferably more than 3mm and 10mm
Below.
In fig. 2, exemplified with along the second concavity outer peripheral edge portion 7a and crest line 9 and the second concavity outer peripheral edge portion 7a or
The mode that first concavity outer peripheral edge portion 3a extends parallel or substantially parallelly, forms the situation in bending shape portion 8.It is however, curved
It is parallel with the second concavity outer peripheral edge portion 7a or the first concavity outer peripheral edge portion 3a or substantially flat that folding shape portion 8 may not be crest line 9
Extend capablely.Moreover, bending shape portion 8 can also be intermittently formed along the second concavity outer peripheral edge portion 7a.Moreover, bending shape
Portion 8 may not be to be formed in a manner of crest line 9 is along the complete cycle extension of the second concavity outer peripheral edge portion 7a.Can also be by bent
Shape portion 8 is formed as, and crest line 9 is only along the curved curvature in the first concavity outer peripheral edge portion 3a greatly i.e. by shaping parsing etc. and pre-
Want the position to produce stretch flange rupture and be connected near this to be extended.
The shape in bending shape portion 8 it is another for example shown in Fig. 3.In figure 3, it is to make bending shape portion 8 with downward pleurapophysis
The example when mode gone out is bent, but bending shape portion 8 can also be made to be bent in a manner of protruding upward to thickness of slab direction.
Here, in the first step, can also be for the position as top plate portion 3 while bending shape portion 8 are formed
Implement punch process, with formed Fig. 6 or as shown in Figure 7 to stretch flange formation of parts top plate portion assign reinforcement with etc.
Concaveconvex shape.But, may not be and the top to end article in the concaveconvex shape of the position formation as top plate portion 3
The identical shape of shape that plate portion assigns, it is preferred that being the shape close with the shape of the imparting of top plate portion 3 to end article.
Moreover, concaveconvex shape can also only be the shaping form of a part for the shape of the imparting of top plate portion 3 to end article.
, can be in advance to the second work when so forming concaveconvex shape using the first step as the position of top plate portion 3
Sequence assigns shape corresponding with the concaveconvex shape by mould clamping as the face of the position of top plate portion 3.In this case, lead to
The concaveconvex shape for crossing the first step imparting has in the second step when the blank in subsidiary bending shape portion is arranged at mould
The effect for aligning and preventing position from deviateing.
[the second step]
The second step is the subsidiary bent in the bending shape portion 8 imparted shown in Fig. 2 that will be shaped by the first step
The blank bending forming in shape portion is the process of centre part.
In the second step, in the subsidiary bending shape formed using punch 30 and the clamping of pad 31 by the first step
In the state of the top plate portion 3 of the blank in portion, punch die 32 is set to be relatively moved along punch 30, thus bending forming longitudinal wall part 5, and with
The mode that flange part 7 is rolled over to 3 lateral bending of top plate portion is set to carry out bending forming.
<The second step mould>
On the second step mould used in the second step, illustrated with reference to Fig. 4.In Fig. 4, in order to understand
One concavity outer peripheral edge portion 3a positions and show to be formed with the state of a part for longitudinal wall part 5 in the second step.
Here, in the following description, with bending shape portion 8 it is upwardly projecting be bent the situation of shaping and said
It is bright.
As shown in figure 4, the second step has with mould：Form the punch 30 of lower die；Form the punch die 32 of upper mold；And will be attached
The pad 31 that the position suitable with top plate portion 3 of blank with bending shape portion is clamped.
<Punch>
Punch 30 has the riser portions 30A and punch extension 30B of top plate portion cramping.Punch extension 30B can also
Become split with riser portions 30A.The riser portions 30A of top plate portion cramping becomes the first punch, and punch extension 30B forms second
Punch.Punch extension 30B can be from downside and at least flange of blank with being connected with the end portion of riser portions 30A
The opposite flange opposite face 30a of the forming position in portion 7.
The upper surface of riser portions 30A, which becomes, to cooperate with pad 31 and clamps the cramping face of the top plate portion 3 for the material that is formed.
In addition, the side 30b of riser portions 30A forms the flexure plane of the curvature identical with the first concavity outer peripheral edge portion 3a, into
For the shape of the shaping longitudinal wall part 5 in stretch flange forming section.That is, the height of the side of riser portions 30A is set as and longitudinal wall part 5
Identical height.
<Pad>
The upper surface that pad 31 is disposed relative to the riser portions 30A of punch 30 can approach separation, upper with punch 30
Ascending part 30A upper surfaces cooperate and can clamp the position suitable with top plate portion 3 in the blank in subsidiary bending shape portion.That is, serve as a contrast
Pad 31 has shape of the lower surface along the first concavity outer peripheral edge portion 3a of top plate portion 3, can be together with punch 30 by top plate portion 3
In the part at least along the first concavity outer peripheral edge portion 3a sides sandwich.
Compare as shown in Figure 4 under top view the position of first concavity outer peripheral edge portion 3a sides of the pad 31 of present embodiment
The side 30b of the riser portions 30A of punch 30 is retreated.Therefore, as shown in figure 4, in the upper surface of the riser portions 30A by punch 30
With the clamping of pad 31 during the position suitable with top plate portion 3, become the first concavity outer peripheral edge portion 3a at the position suitable with top plate portion 3
The state that side is exposed upward.
<Punch die>
The punch side side of punch die 32 cooperates with the side 30b of riser portions 30A and becomes the flexure plane of shaping longitudinal wall part 5.
The punch side side of the punch die 32 protuberance 32a that side is protruded formed with (30 side of punch) outward at an upper portion thereof.The protrusion
Portion 32a is abutted via raw material and with the upper surface of punch 30, thus limits the further movement of punch die 32 downwards.That is, the limit
Position processed becomes the position of shaping lower dead center when making the decline of punch die 32.Moreover, from protuberance 32a to the punch die of lower end position
The height of side is set as the height of longitudinal wall part 5.
In addition, being equipped with end difference 32b in the lower surface opposite with flange part 7 of punch die 32, thus concave avoidance is set
Portion 32d.By the way that with relief portion 32d, during before punch die 32 is moved to shaping lower dead center, the lower surface of punch die 32 becomes
The construction in bending shape portion 8 is not clamped, preferably becomes the construction not contacted with bending shape portion 8.The lower surface of end difference 32b
The width of 32c becomes the width below the width of flange part.
In the state of punch die 32 is dropped to the position of shaping lower dead center, the flange opposite face 30a and punch die of punch 30
The difference of height (gap) of the bottom surface of 32 relief portion 32d be redefined for formed on the blank in subsidiary bending shape portion it is curved
The height of folding shape portion 8 is equal or more than the height.
Set in this way, the configuration bending shape portion 8 in the gap (recess) formed by the relief portion 32d of punch die 32,
As a result, bending shape portion 8 will not be limited in the bending forming of the second step, be clamped.In this way, wrapped in bending forming
The position in portion containing bending shape 8 is not restricted and freely deforms, and thus on flange part, reduces stress concentration in specific portion
The situation of position, can further prevent the generation of rupture.
It should be noted that in the case that bending shape portion 8 is protruded in the flange opposite face 30a sides of punch 30, as long as
Flange opposite face 30a sides set the recess shapes of relief portion as described above.
On having used the second step of the second step mould formed as described above, illustrate the second work with reference to Fig. 5
The action of sequence mould.
Fig. 5 (a) shows the state of the top plate portion 3 of the blank by punch 30 and the subsidiary bending shape portion of the cramping of pad 31,
State when Fig. 5 (b) shows to make the punch die 32 be relatively moved to stamping lower dead center.
First, as Fig. 5 (a), the top plate portion 3 of the blank in subsidiary bending shape portion is placed in the upper table of punch 30
Face, is clamped using punch 30 and pad 31.It should be noted that pad 31 be not arranged in stretch flange forming section with
The whole face at the suitable position of top plate portion 3, and be disposed on corresponding curved with the first concavity outer peripheral edge portion 3a from having for punch 30
Slightly it is inclined to the position of inner side in bent side.
In this case, punch die 32 is made to relatively move to Fig. 5 (b) along the side of punch 30 towards flange opposite face 30a
Position, thus to the first concavity outer peripheral edge portion 3a, longitudinal wall part 5 and flange part 7 carry out bending forming.
That is, gone out by the relative movement of the punch die 32 of the second step, the blank bending forming first in subsidiary bending shape portion
The part of first concavity outer peripheral edge portion 3a.Next, as longitudinal wall part 5 position from being connected with the first concavity outer peripheral edge portion 3a
Upside is sequentially towards downside bending forming, in addition, 7 side of flange part of blank and the flange opposite face 30a of punch extension 30B
Contact, bending forming go out the interface of 5 bottom of longitudinal wall part and flange part 7.In this way, in the present embodiment, from top plate portion side
Sequentially and it is applied continuously in bending.
At this time, the position for forming bending shape portion 8 in the blank in subsidiary bending shape portion is (than the position as flange part
Become stretch flange in the outer part) and shape and act on the tensile stress for having peripheral direction.However, the position and stamping preceding original
The end face of plate is different, and the crest line 9 in bending shape portion 8 exists with shape continuously in a circumferential, thus there is no rupture starting point and
Rupture is difficult to produce.Moreover, the crest line 9 in bending shape portion 8 is shape continuously in a circumferential, therefore there is no stress collection at the position
In and be attached with homogeneous tensile stress, therefore from this starting point, be also difficult to produce rupture in stretch flange portion.
In addition, the bending shape portion 8 of present embodiment extends under top view along the second concavity outer peripheral edge portion 7a, because
This tensile stress that can make to act on bending shape portion 8 more uniforms.
In addition, bending shape portion 8 as defined in above-mentioned is at least formed in the curved of the flange part of stretch forming in the first step
Near pars convoluta, thus, that is, the part for becoming the second concavity outer peripheral edge portion 7a receives stretch flange deformation in the second step
In the case of, strained due to the shape rigidity in bending shape portion 8 and also easily disperseed, can prevent strain from concentrating on recessed as second
The situation of the part of shape outer peripheral edge portion 7a.
In addition, bending shape portion 8 as defined in above-mentioned shapes in the first step, thus, the second concavity outer peripheral edge portion 7a exists
When flange deformation is stretched during the second step, become the second concavity by the way that bending shape portion 8 is formed with certain height
The part planarization of outer peripheral edge portion 7a, it is poor can to obtain line length.Therefore, the second concavity outer peripheral edge portion 7a be difficult to effect have it is stronger
Peripheral direction tensile stress.
In this way, the homogenization by acting on the tensile stress on the part for becoming the second concavity outer peripheral edge portion 7a, for
The end face in the outside in bending shape portion 8 also acts on the stress after homogenization, and jagged or small scar is remained even in end face
Deng can also relax stress concentration, rupture inhibition can be also played from this starting point.
In addition, way, the position comprising bending shape portion 8 are not limited by mould in formation, therefore can dimensionally freely
Deformation (mobile or avoidance), from this starting point, also can further relax the end face for concentrating the part for acting on shaping midway
Tensile stress.
As previously discussed, do not produce rupture and shape centre part.
Here, be illustrated with the situation that bending shape portion 8 protrudes upward, but in bending shape portion 8 downwards
In the case of protrusion, the recess shapes for avoiding bending shape portion can also be formed in the punch extension 30B sides of punch 30.And
And it can also be used to avoid bent with being formed on the face of the two opposite sides of punch die 32 in the punch extension 30B of punch 30
The recess shapes in shape portion.
[the third step]
In the third step, the position in the outside of the flange part 7 of centre part is repaired, forms the second concavity periphery
Edge 7a.Thus, the stretch flange formation of parts comprising stretch flange forming section is produced.Bending is included at the position of the finishing
Shape portion 8.
As previously discussed, in the present embodiment, bending shape portion 8 is formed in the first step, will in the second step
The blank bending forming in the subsidiary bending shape portion be centre part, in the third step to the flange part 7 of centre part outside
The position of side is repaired, so even using more than 980MPa grades of ultrastrength material as stamping preceding raw sheet
In the case of, it can also suppress to rupture, the stretch flange formation of parts comprising stretch flange forming section can be produced well.
[effect of present embodiment]
(1) possess：The first step, for blank, bending shape portion 8, the bending are being formed than 7 outer side position of flange part
The crest line 9 of shape portion 8 extends along the second concavity outer peripheral edge portion 7a and is bent along thickness of slab direction；The second step, in the first step
Afterwards, bending forming is carried out to above-mentioned longitudinal wall part 5 and above-mentioned flange part 7 by being fixed as the position of top plate portion 3.
According to the structure, even if assuming ultrastrength material more than 980MPa grades of use intensity grade, pass through the second work
The bending forming of sequence can also form longitudinal wall part 5, and the second concavity periphery by being ruptured along easy generation stretch flange
Edge 7a pre-sets bending shape portion 8, can suppress the stretch flange rupture during bending forming in the second step.
In addition, longitudinal wall part is processed by drawing and forming, but shaped by bending forming, therefore can be with low
Shaping load manufactures.
Situation due to more than, according to the present embodiment, even if assuming strong from the superelevation of more than 980MPa grades of strength grade
In the case that degree material manufactures stretch flange formation of parts with stretch flange shaping, it can also suppress stretch flange rupture simultaneously
Manufactured with low shaping load.
(2) possesses the third step that the position in the outside after the second step to above-mentioned flange part 7 is repaired.
If repaired in advance for stamping preceding raw sheet (blank) by punch press process or Laser Processing,
Material end face remains burr or small scar etc., therefore becomes the stress collection that locality is easily produced when being applied with deformation
In state.Therefore, way produces the cracking for being known as stretch flange rupture in formation on material end face, in ultrastrength material
In the case of (strength grade is 980MPa grades of high-strength steel sheets above), which rapidly propagates and easily produces big break
Split.
In contrast, being repaired after the second step to the outside left of flange part 7, come the periphery in shaped flange portion 7
Edge, is thus more difficult to produce stretch flange rupture in the end face of flange part 7.
(3) in addition, the mould in the second step sets and avoids the relief portion 32d in bending shape portion 8.
According to the structure, the position comprising bending shape portion 8 in formation from the second step mould limitation, because
This can dimensionally Free Transform (mobile or avoid), also can further relax concentration from this starting point and act in shaping
Tensile stress on the end face of the part on way.
(4) height of the step in bending shape portion 8 is set to more than 3mm and below 10mm.
By the way that the height in bending shape portion 8 is defined as the scope, even if assuming use intensity grade more than 980MPa grades
Ultrastrength material, also can more reliably suppress stretch flange rupture.
Embodiment
<Example 1>
The shape identical with the A columns shown in Fig. 7 is manufactured using 980MPa grades of cold-rolled steel sheets (thickness of slab 1.6mm) as blank
Part when, by shown in the above embodiment via the first step, the second step, the manufacture in this 3 stages of the third step
Method has manufactured the formed products of example 1 of the present invention.
That is, manufacturing procedure forms bending shape portion 8 in the first step as described above.Next, in the second step,
Order according to the first concavity outer peripheral edge portion 3a, longitudinal wall part 5 and flange part 7 has continuously carried out bending forming.Then, as
Three processes, repair the position in the outside of flange part 7, form the formed products of example 1 of the present invention.It should be noted that will
The height of longitudinal wall part is set to 100mm.
On the other hand, the part on the shape identical with the A columns shown in Fig. 6, only by the drawing and forming of a process and
Longitudinal wall part is formed, then, the position in the outside of flange part is repaired and has manufactured the formed products of comparative example 1.Need to illustrate
, in comparative example 1, it is not provided with bending forming section.
The formed products of example 1 of the present invention and the stretch flange part of the formed products of comparative example 1 are compared.It evaluates knot
Fruit is, in example 1 of the present invention, the flange part in bending section does not produce rupture completely, in contrast, in comparative example 1, in Fig. 6
Shown position generates rupture.
As previously discussed, when manufacturing A columns, it is known that example 1 of the present invention relative to comparative example 1 superiority.
<Example 2>
The shape identical with the center pillar shown in Fig. 6 is manufactured using 1180MPa grades of cold-rolled steel sheets (thickness of slab 1.6mm) as blank
During the part of shape, by shown in the above embodiment via the first step, the second step, the system in this 3 stages of the third step
The method of making has manufactured the formed products of example 2 of the present invention.
That is, manufacturing procedure forms bending shape portion 8 in the first step as described above.Next in the second step,
Order according to the first concavity outer peripheral edge portion 3a, longitudinal wall part 5 and flange part 7 has continuously carried out bending forming.Then, as
Three processes, repair the position in the outside of flange part 7, form the formed products of example 2 of the present invention.It should be noted that will
The height of longitudinal wall part is set to 100mm.
On the other hand, by the part of the shape identical with the center pillar shown in Fig. 7 only by the drawing and forming of a process come shape
Into longitudinal wall part, then, the position in the outside of flange part is repaired and has manufactured the formed products of comparative example 2.Need what is illustrated
It is in comparative example 2, to be not provided with bending forming section.
The formed products of example 2 of the present invention and the stretch flange part of the formed products of comparative example 2 are compared.It evaluates knot
Fruit is, in example 2 of the present invention, the flange part in bending section does not produce rupture completely, in contrast, in comparative example 2, in Fig. 7
Shown position generates rupture.
As previously discussed, in the mill column when, it is known that example 2 of the present invention relative to comparative example 2 superiority.
More than, this application claims the Japan patent application 2015-169227 (2015 on August 28, apply) of priority
Full content by referring to and be used as a part of this disclosure.
Here, the embodiment with reference to limited number is illustrated, but interest field is not limited to this, is based on
The change of above-mentioned disclosed each embodiment is self-evident to those skilled in the art.
Label declaration
1 flange forming section
3 top plate portions
3a the first concavity outer peripheral edge portions
5 longitudinal wall parts
7 flange parts
7a the second concavity outer peripheral edge portions
8 bending shape portions
9 crest lines
30 punches
The riser portions (the first punch) of 30A top plate portion crampings
30B punches extension (the second punch)
31 pads
32 punch dies
32d relief portion.
Claims (3)
1. a kind of manufacture method of stretch flange formation of parts, for manufacturing stretch flange formation of parts, the stretch flange into
Shape part possesses：Top plate portion, has the part of outer peripheral edge hollowly curved concavity outer peripheral edge portion inwardly；Longitudinal wall part, with
The concavity outer peripheral edge portion connection of the top plate portion；And flange part, it is connected and is rolled over to the top plate portion lateral bending, institute with the longitudinal wall part
The manufacture method for stating stretch flange formation of parts is characterized in that,
Possesses following process：
The first step, for blank, place forms bending shape portion, the bending in the outer part than the position as the flange part
The crest line of shape portion extends along the position of the outer peripheral edge portion as the flange part and is bent along thickness of slab direction；
The second step, after the first step, will fix and to the longitudinal wall part and institute as the position of the top plate portion
State flange part and carry out bending forming；And
The third step, after the second step, repairs the position in the outside of the flange part.
2. the manufacture method of stretch flange formation of parts according to claim 1, it is characterised in that
The second step makes punch die edge in the state of being clamped using punch and pad to the position of the top plate portion
The punch to make a relative move, thus in accordance with the order of the concavity outer peripheral edge portion, the longitudinal wall part and the flange part
Continuously carry out bending forming.
3. the manufacture method of stretch flange formation of parts according to claim 1 or 2, it is characterised in that
The second step will be clamped and fixed as the position of the top plate portion using punch and pad, using punch die to described
Longitudinal wall part and the flange part carry out bending forming, and possess the second punch, second punch have across blank and with institute
The opposite face of punch die is stated,
Produced in the face opposite with the blank of the punch die and the second punch and at least by the bending in the bending shape portion
The bending shape portion protrusion side face on, formed with the concave avoidance that can be avoided with the contact in the bending shape portion
Portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015169227 | 2015-08-28 | ||
| JP2015-169227 | 2015-08-28 | ||
| PCT/JP2016/074657 WO2017038579A1 (en) | 2015-08-28 | 2016-08-24 | Method for manufacturing stretch-flange-formed component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107921504A true CN107921504A (en) | 2018-04-17 |
| CN107921504B CN107921504B (en) | 2020-02-07 |
Family
ID=58187449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680049697.9A Expired - Fee Related CN107921504B (en) | 2015-08-28 | 2016-08-24 | Method for manufacturing stretch flange formed part |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6156608B1 (en) |
| KR (1) | KR102023541B1 (en) |
| CN (1) | CN107921504B (en) |
| MX (1) | MX367318B (en) |
| WO (1) | WO2017038579A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365752A (en) * | 2019-01-31 | 2021-09-07 | 杰富意钢铁株式会社 | Method for manufacturing stamped member and method for manufacturing blank |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6908078B2 (en) * | 2018-10-31 | 2021-07-21 | Ｊｆｅスチール株式会社 | Manufacturing method of pressed parts and design method of lower die |
| WO2020144995A1 (en) * | 2019-01-11 | 2020-07-16 | Ｊｆｅスチール株式会社 | Press-molding method, blank member of plate-shaped material, intermediate molded article, method for manufacturing press-molded article, and press-molded article |
| EP3909697A4 (en) * | 2019-01-11 | 2022-03-02 | JFE Steel Corporation | Press-molding method, blank member of plate-shaped material, intermediate molded article, method for manufacturing press-molded article, and press-molded article |
| WO2020153500A1 (en) * | 2019-01-25 | 2020-07-30 | 日本製鉄株式会社 | Press molding method and press machine |
| WO2021200233A1 (en) * | 2020-03-31 | 2021-10-07 | Ｊｆｅスチール株式会社 | Method for manufacturing pressed component, method for manufacturing blank material, and steel sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102791396A (en) * | 2010-05-19 | 2012-11-21 | 新日本制铁株式会社 | Method for press-forming L-shaped components |
| WO2014106932A1 (en) * | 2013-01-07 | 2014-07-10 | 新日鐵住金株式会社 | Press component and method and device for manufacturing same |
| CN107708884A (en) * | 2015-06-16 | 2018-02-16 | 杰富意钢铁株式会社 | The manufacture method of stretch flange profiled part |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002282952A (en) * | 2001-03-22 | 2002-10-02 | Kobe Steel Ltd | Method for press forming aluminum alloy panel molded product |
| JP2012245536A (en) * | 2011-05-26 | 2012-12-13 | Nippon Steel Corp | Method of forming press component |
| JP5965159B2 (en) * | 2012-02-22 | 2016-08-03 | 東プレ株式会社 | Molding method for press parts |
-
2016
- 2016-08-24 JP JP2017505584A patent/JP6156608B1/en active Active
- 2016-08-24 MX MX2018002445A patent/MX367318B/en active IP Right Grant
- 2016-08-24 KR KR1020187005408A patent/KR102023541B1/en active IP Right Grant
- 2016-08-24 WO PCT/JP2016/074657 patent/WO2017038579A1/en active Application Filing
- 2016-08-24 CN CN201680049697.9A patent/CN107921504B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102791396A (en) * | 2010-05-19 | 2012-11-21 | 新日本制铁株式会社 | Method for press-forming L-shaped components |
| WO2014106932A1 (en) * | 2013-01-07 | 2014-07-10 | 新日鐵住金株式会社 | Press component and method and device for manufacturing same |
| CN107708884A (en) * | 2015-06-16 | 2018-02-16 | 杰富意钢铁株式会社 | The manufacture method of stretch flange profiled part |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365752A (en) * | 2019-01-31 | 2021-09-07 | 杰富意钢铁株式会社 | Method for manufacturing stamped member and method for manufacturing blank |
| CN113365752B (en) * | 2019-01-31 | 2023-01-13 | 杰富意钢铁株式会社 | Method for manufacturing stamped member and method for manufacturing blank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107921504B (en) | 2020-02-07 |
| MX2018002445A (en) | 2018-06-15 |
| KR20180031764A (en) | 2018-03-28 |
| WO2017038579A1 (en) | 2017-03-09 |
| JPWO2017038579A1 (en) | 2017-08-31 |
| JP6156608B1 (en) | 2017-07-05 |
| KR102023541B1 (en) | 2019-09-20 |
| MX367318B (en) | 2019-08-15 |
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