CN105307792A - Press molding method - Google Patents
Press molding method Download PDFInfo
- Publication number
- CN105307792A CN105307792A CN201480033169.5A CN201480033169A CN105307792A CN 105307792 A CN105307792 A CN 105307792A CN 201480033169 A CN201480033169 A CN 201480033169A CN 105307792 A CN105307792 A CN 105307792A
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- China
- Prior art keywords
- metallic plate
- drift
- eccentric swage
- pressed compact
- material ring
- Prior art date
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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
- B21D24/04—Blank holders; Mounting means therefor
Abstract
This press molding method is characterized by having: a metal plate disposing step for disposing a metal plate (17) in a manner such that the portion (17a) contacting the end of the narrow end (2a) of the metal plate (17) does not impinge on a blank holder (9); a metal plate sandwiching step for sandwiching the disposed metal plate (17); a molding step for molding the metal plate (17) in the sandwiched state by means of drawing; and a pad restraining step after the metal plate sandwiching step for restraining a position including an L-shaped bend (2b) at a site corresponding to the top plate (2) of the metal plate (17) by means of a pad (11) and a punch (6) partway through the molding process. The press molding method is further characterized in that the pad restraining step is started where the punch in the molding step is at a position that is 0-50% of the molding depth from the position of the start of contact to the metal plate (17) to the bottom dead center position, and the blank holder pressure is at least 0.7 MPa and the pad pressure is at least 3 MPa.
Description
Technical field
The present invention relates to and shaping impact forming method is carried out to the parts in the T-shaped shape portion with L-shaped shape portion that top view is L-shaped shape or top view shape in T shape.
Background technology
Such as when by punch forming (pressforming) by metallic plate manufacture the body frame parts of automobile that is front pillar (pillar) reinforcement (reinforcement), center pillar stiffener etc. there are the parts in the T-shaped shape portion of L-shaped shape portion that top view is L-shaped shape or shape in T shape, usually adopt drawing and forming (drawing) method.Drawing and forming method is following method: usually use by drift (punch), punch die (die), and the mould (dieofpressforming) that pressed compact material ring (blankholder) (wrinkle resistant) is formed carries out, under utilizing punch die and pressed compact material ring by states whole around laminated metal sheet (metalsheet), the distance reduced between drift and punch die to implement drawing to metallic plate and is processed.
In such drawing and forming method, becoming the sharply bending L-shaped shape portion of shape or the parts top plate portion (topportion) in T-shaped shape portion easily produces fold (wrinkles).On the other hand, if the pressing force suppressing this fold and improve further by punch die and pressed compact material ring, then in the shoulder (shoulderportion) of mould, the longitudinal wall part (verticalwallportion) of parts, parts easily crack (crack).Particularly in recent years, in order to realize security raising and the lightness (weightreductionofautomotivebody) of body of a motor car, the strength increases becoming the metallic plate of shaping raw material (steelsheet: steel plate) is high.The metallic plate of such high strength (high-strength) cannot expect the ductility of the degree of the soft steel plate (softsteelsheet) in the past used, and the crackle therefore during reply punch forming and the countermeasure of fold become important.
For such problem, in technology proposed up to now, propose a kind of in order to L-shaped shape parts are carried out shaping and after drawing and forming more mold exchange carry out further brake forming such, the method that forms final products shape via Multi-step forming molding procedure (with reference to patent document 1).In addition, the die unit that also a kind of use of proposition is made up of punching die, eccentric swage and bending mould (bendingdie) carrys out the impact forming method (with reference to patent document 2) that punch forming has the skeleton part in L-shaped shape portion.
Patent document 1: International Publication WO2012/070623
Patent document 2: International Publication WO2011/145679
But in the method described in patent document 1, molding procedure number increases, and therefore cost raises.In addition, in the method described in patent document 2, although do not have problems when the flange of parts is roughly same level, but when coordinating the curve form of vehicle body and bend with making flange (flange) shaped three dimensional as center pillar stiffener etc., the flange of the position (being equivalent to the position at the straight line position of Fig. 1 or Fig. 2 of patent document 2) beyond L-shaped shape portion, the generation of fold is more obvious than existing drawing and forming.
Summary of the invention
The present invention completes to solve above-mentioned problem, even if its object is to provide the high strength steel (high-tensilesteelsheet) of the low superhigh intensity (ultrahighstrength) of a kind of use ductility, also can not increase molding procedure number and realize the suppression of fold and the impact forming method avoided of crackle in the parts in T-shaped shape portion with L-shaped shape portion that top view is L-shaped shape or top view shape in T shape.
Impact forming method involved by the 1st aspect of the present invention uses has drift, punch die, the punch-forming mold of pressed compact material ring and eccentric swage (pad), stamped metal sheets is molded into and possesses top plate portion, longitudinal wall part and flange part and there are the parts that top view is the L-shaped shape portion of L-shaped shape, above-mentioned drift has forming surface, above-mentioned punch die has the forming surface corresponding with this drift, above-mentioned metallic plate is clamped between above-mentioned pressed compact material ring and this punch die, above-mentioned eccentric swage coordinates the part clamping above-mentioned metallic plate with drift, above-mentioned longitudinal wall part is formed at around this top plate portion, above-mentioned flange part and this longitudinal wall part are formed continuously, the feature of above-mentioned impact forming method is, have: metallic plate arrangement step, the mode not riding over above-mentioned pressed compact material ring with the position suitable with the end of the minor face of above-mentioned L-shaped shape of this metallic plate configures above-mentioned metallic plate, metallic plate clamping operation, utilizes above-mentioned punch die and above-mentioned pressed compact material ring to clamp to be configured to by this metallic plate arrangement step the above-mentioned metallic plate on pressed compact material ring, molding procedure, is pushed drift relative to the above-mentioned metallic plate of the state clamped by above-mentioned punch die and above-mentioned pressed compact material ring and is processed by drawing and carry out shaping to above-mentioned metallic plate, and eccentric swage pressing process, after above-mentioned metallic plate clamping operation, utilize above-mentioned drift and above-mentioned eccentric swage to press the position at least comprising the flexing portion of L-shaped shape at the position suitable with above-mentioned top plate portion of above-mentioned metallic plate in above-mentioned molding procedure midway, the position that this eccentric swage pressing process is being 0% ~ 50% relative to the form depth from the position that above-mentioned drift contacts with above-mentioned metallic plate to lower dead center (bottomdeadcenter) position in above-mentioned molding procedure starts, the average pressure utilizing above-mentioned punch die and above-mentioned pressed compact material ring to press above-mentioned metallic plate in above-mentioned metallic plate clamping operation is more than 0.7MPa, the average pressure utilizing above-mentioned drift and above-mentioned eccentric swage to press above-mentioned metallic plate in above-mentioned eccentric swage pressing process is more than 3MPa.
Impact forming method involved by the 2nd aspect of the present invention uses has drift, punch die, the punch-forming mold of pressed compact material ring and eccentric swage, stamped metal sheets is molded into and possesses top plate portion, longitudinal wall part and flange part and there are the parts in the T-shaped shape portion of top view shape in T shape, above-mentioned drift has forming surface, above-mentioned punch die has the forming surface corresponding with this drift, above-mentioned metallic plate is clamped between above-mentioned pressed compact material ring and this punch die, above-mentioned eccentric swage coordinates the part clamping above-mentioned metallic plate with drift, above-mentioned longitudinal wall part is formed at around this top plate portion, above-mentioned flange part and this longitudinal wall part are formed continuously, the feature of above-mentioned impact forming method is, have: metallic plate arrangement step, the mode not riding over above-mentioned pressed compact material ring with the position suitable with the end of the horizontal edge of above-mentioned T-shaped shape of this metallic plate configures above-mentioned metallic plate, metallic plate clamping operation, utilizes above-mentioned punch die and above-mentioned pressed compact material ring to clamp to be configured to by this metallic plate arrangement step the above-mentioned metallic plate on pressed compact material ring, molding procedure, is pushed drift relative to the above-mentioned metallic plate of the state clamped by above-mentioned punch die and above-mentioned pressed compact material ring and is processed by drawing and carry out shaping to above-mentioned metallic plate, and eccentric swage pressing process, after above-mentioned metallic plate clamping operation, utilize above-mentioned drift and above-mentioned eccentric swage to press the position at least comprising the horizontal edge of T-shaped shape and the linking part of longitudinal edge at the position suitable with above-mentioned top plate portion of above-mentioned metallic plate in above-mentioned molding procedure midway, the position that this eccentric swage pressing process is being 0% ~ 50% relative to the form depth from the position that above-mentioned drift contacts with above-mentioned metallic plate to bottom dead center position in above-mentioned molding procedure starts, the average pressure utilizing above-mentioned punch die and above-mentioned pressed compact material ring to press above-mentioned metallic plate in above-mentioned metallic plate clamping operation is more than 0.7MPa, the average pressure utilizing above-mentioned drift and above-mentioned eccentric swage to press above-mentioned metallic plate in above-mentioned eccentric swage pressing process is more than 3MPa.
According to the present invention, in the parts in T-shaped shape portion with L-shaped shape portion that top view is L-shaped shape or top view shape in T shape, even if use the high strength steel of the low superhigh intensity of ductility to be used as metallic plate, also can not increase molding procedure number and realize the suppression of fold and avoiding of crackle.
Accompanying drawing explanation
Fig. 1 is the key diagram be described the impact forming method involved by the first embodiment of the present invention.
Fig. 2 is the shaping object of impact forming method involved by the first embodiment of the present invention that is the top view of L-shaped shape parts.
Fig. 3 is that the A-A of the L-shaped shape parts shown in Fig. 2 is to the enlarged drawing looking section.
Fig. 4 is the key diagram be described the punch-forming mold used in the impact forming method involved by the first embodiment of the present invention.
Fig. 5 is the key diagram be described the punch-forming mold used in the impact forming method involved by the first embodiment of the present invention, represents the figure having installed the state of punch-forming mold at punch forming device.
Fig. 6 is the key diagram be described an example of the eccentric swage scope in the eccentric swage pressing process of the impact forming method involved by the first embodiment of the present invention.
Fig. 7 is the key diagram be described an example of the eccentric swage scope in the eccentric swage pressing process of the impact forming method involved by the first embodiment of the present invention.
Fig. 8 is the key diagram that an example of the configuration of metallic plate in the metallic plate arrangement step of impact forming method involved by the first embodiment of the present invention is described.
Fig. 9 be as the impact forming method involved by the second embodiment of the present invention other shaping objects that is there is the example of parts in T-shaped shape portion and the top view of the center pillar illustrated.
Figure 10 is that the B-B of the center pillar shown in Fig. 9 is to the enlarged drawing looking section.
Figure 11 is the key diagram be described an example of the configuration of the metallic plate in the metallic plate arrangement step of the situation of the center pillar shown in punch forming Fig. 9.
Figure 12 is the shaping object of impact forming method involved by embodiments of the invention 1 that is the top view of front pillar.
Figure 13 is that the C-C of the front pillar shown in Figure 12 is to the enlarged drawing looking section.
Figure 14 is the key diagram that the counterdie (lowerdie) to the punch-forming mold used in the impact forming method involved by embodiments of the invention 1 is described.
Figure 15 is the key diagram that the patrix (upperdie) to the punch-forming mold used in the impact forming method involved by embodiments of the invention 1 is described.
Figure 16 is the key diagram of the condition of molding of impact forming method involved by embodiments of the invention 1, is the key diagram be described the starting position of eccentric swage pressing process.
Figure 17 is the key diagram of the condition of molding of impact forming method involved by embodiments of the invention 1, is the key diagram be described the configuration of the metallic plate in metallic plate arrangement step.
Figure 18 is the key diagram of the condition of molding of impact forming method involved by embodiments of the invention 1, is the key diagram be described the eccentric swage scope in eccentric swage pressing process.
Figure 19 is the key diagram of the condition of molding of impact forming method involved by embodiments of the invention 2, is the key diagram be described the configuration of the metallic plate in metallic plate arrangement step.
Detailed description of the invention
[the first embodiment]
Impact forming method (with reference to Fig. 1) involved by first embodiment of the present invention is the method using the punch-forming mold 5 shown in Fig. 4 and Fig. 5 to carry out the L-shaped shape parts 1 shown in punch forming Fig. 2 and Fig. 3.Before impact forming method is described, L-shaped shape parts 1 and punch-forming mold 5 are described.Below, L-shaped shape parts 1 are summarized.
As shown in Figure 2, L-shaped shape parts 1 have top view in the top plate portion 2 of the L-shaped shape be made up of long limit and minor face, the longitudinal wall part 3 being formed at the surrounding of top plate portion 2 and the flange part 4 formed continuously with longitudinal wall part 3, and its section is as shown in Figure 3 in hat (hat-shape).Longitudinal wall part 3 and flange part 4 is not formed at the both ends on the long limit of top plate portion 2 and the end (minor face end 2a) of minor face.
Next, according to Fig. 4 ~ Fig. 8, punch-forming mold 5 is described.As shown in Figure 4, punch-forming mold 5 has: the drift 6 with forming surface 6a; There is the punch die 7 of the forming surface 7a corresponding with drift 6; Pressed compact material ring 9, clamps metallic plate 17 (with reference to Fig. 5) between itself and punch die 7; And eccentric swage 11, it coordinates the part (with reference to Fig. 5) clamping metallic plate 17 with drift 6.As shown in Figure 5, drift 6 and pressed compact material ring 9 are installed on backing plate (bolster) 13, and punch die 7 and eccentric swage 11 are installed on sliding part (slider) 15.Below, each structure is described in detail.
< drift >
As shown in Figure 4, drift 6 has the forming surface 6a that top view is L-shaped shape, is configured in the opening portion 9a being arranged at pressed compact material ring 9.
< punch die >
The central portion of punch die 7 caves in as L-shaped shape as illustrated in fig. 4, and the inner surface of this depression is the forming surface 7a corresponding with drift 6.The position comprising the flexing portion of L-shaped shape of forming surface 7a is provided with opening portion 7b, is configured with eccentric swage 11 (with reference to Fig. 5 and Fig. 6) at this opening portion 7b.The lower surface of punch die 7 becomes clamping face 7c, between this clamping face 7c and pressed compact material ring 9, clamp metallic plate 17.
< pressed compact material ring >
The central authorities of pressed compact material ring 9 are provided with opening portion 9a, are configured with drift 6 at opening portion 9a.As shown in Figure 5, pressed compact material ring 9 is buffered pin (cushionpin) 19 supporting for moving up and down.Pressed compact material ring 9 is usually supported to and is positioned at the position more closer to the top than the upper surface of drift 6, can be depressed when punch forming by punch die 7.If pressed compact material ring 9 is depressed, then drift 6 is relatively given prominence to from pressed compact material ring 9, thus punch die 7 (with reference to Fig. 1 (c)) is inserted on the top of drift 6.
< eccentric swage >
As shown in Figure 5, eccentric swage 11 is set to by cylinder (gascylinder) 21 grade towards the pressing of drift 6 side, and can clamp a part for the top plate portion 2 (with reference to Fig. 2) of metallic plate 17 ordinatedly with drift 6.As shown in Figure 6, be formed as can by the position of the flexing portion that the is equivalent to 2b of laminated metal sheet 17 (with reference to Fig. 2) for the shape of eccentric swage 11.In it is possible to the generation of the fold suppressing flexing portion 2b.In addition, as shown in Figure 7, by being formed at the circular arc D of inner side of flexing portion 2b, the part that impales with tangent line L1 and the tangent line L2 at the two ends of circular arc D the most easily produces fold, preferred eccentric swage 11 presses more than 8 one-tenth of the area S of this part.
Next, the impact forming method used involved by the present embodiment of above-mentioned diel is described.Impact forming method involved by present embodiment has following operation: metallic plate arrangement step, and the position suitable with the end of the minor face of L-shaped shape metallic plate 17 being configured to metallic plate 17 does not ride over pressed compact material ring 9 (with reference to Fig. 1 (a)); Metallic plate clamping operation, utilizes punch die 7 and pressed compact material ring 9 to clamp to be configured to by metallic plate arrangement step the metallic plate 17 (with reference to Fig. 1 (b)) on pressed compact material ring 9; Molding procedure, is pushed drift 6 relative to the metallic plate 17 of the state that hold by punch die 7 and pressed compact material ring 9 and is processed by drawing and carry out shaping to metallic plate 17; And eccentric swage pressing process, after metallic plate clamping operation, utilize drift 6 and the position (with reference to Fig. 1 (c)) of eccentric swage 11 by the flexing portion that comprises (elbow-shapedbendportion) 2b of laminated metal sheet 17 in molding procedure midway.Below above-mentioned each operation is described in detail.
< metallic plate arrangement step >
As shown in Figure 8, metallic plate arrangement step is the operation that the position 17a suitable with minor face end 2a metallic plate 17 being configured to metallic plate 17 does not ride over pressed compact material ring 9.If the mode riding over pressed compact material ring 9 with the position 17a suitable with minor face end 2a carries out punch forming, then comparatively large to the load of the metallic plate 17 at this position, thus the position corresponding with the shoulder of drift 6 of metallic plate 17 cracks, produce fold at the flange part 4 of parts near corners.Therefore, the generation that metallic plate 17 comes Crack prevention, fold is configured as described above.
< metallic plate clamping operation >
Metallic plate clamping operation utilizes punch die 7 and pressed compact material ring 9 to clamp the operation being configured to the metallic plate 17 on pressed compact material ring 9 by metallic plate arrangement step.Like this, the reason utilizing punch die 7 and pressed compact material ring 9 to clamp metallic plate 17 produces fold in order to suppress at flange.When not utilizing punch die 7 to clamp with pressed compact material ring 9, if press-in drift 6, then at the change section periphery of component shape, the part that can move freely in metallic plate 17 flows into, and easily produces fold.Particularly become parts flange part 4 (with reference to Fig. 2) metallic plate 17 end near, metallic plate 17 can easily be out of shape, and therefore produces larger fold.Therefore, need to utilize punch die 7 and pressed compact material ring 9 by laminated metal sheet 17 from the punch forming initial stage.In addition, punch die 7 and pressed compact material ring 9 is preferably utilized to be more than 0.7MPa by the average pressure (pressed compact material ring compression) of laminated metal sheet 17.
< molding procedure >
Molding procedure pushes drift 6 relative to the metallic plate 17 of the state clamped by punch die 7 and pressed compact material ring 9 and processed by drawing and carry out shaping operation to metallic plate 17.
< eccentric swage pressing process >
Eccentric swage pressing process is after metallic plate clamping operation, utilizes drift 6 and the operation that comprise the position at flexing portion 2b suitable position of eccentric swage 11 by laminated metal sheet 17 in molding procedure midway.Like this, drift 6 and eccentric swage 11 is utilized to be effective by the generation of laminated metal sheet 17 to the fold suppressed in flexing portion 2b (with reference to Fig. 7).If utilize drift 6 to be at least flexing portion 2b (with reference to Fig. 2) with eccentric swage 11 by the scope (eccentric swage scope) of laminated metal sheet 17, then the generation that can press fold becomes the position of problem.Also can at more wide scope pressing top plate portion 2.
Eccentric swage pressing process relative in molding procedure from the position that drift 6 contacts with metallic plate 17 (with reference to Fig. 1 (b)) to bottom dead center position (with reference to Fig. 1 (c)) form depth be 0% ~ 50% position start.Make to utilize drift 6 and eccentric swage 11 start by laminated metal sheet 17 time be engraved in 0% position of form depth after, reason after drift 6 contacts with metallic plate 17 be because: the expansion that can suppress the metallic plate 17 at top plate portion 2 place from the contact initial stage of drift 6 and metallic plate 17, effectively can suppress the generation of fold.
Preferably do not utilize drift 6 and eccentric swage 11 by laminated metal sheet 17 in the position (position such as shown in Fig. 1 (a)) that 0% than form depth is more forward, this is because, utilize punch die 7 and pressed compact material ring 9 by laminated metal sheet 17 before utilize eccentric swage 11 be pressed into metallic plate 17 to drift 6 direction, cause producing excessive material relative to the net shape of parts and remain.In addition, even if exceed form depth 50% position after utilize drift 6 and eccentric swage 11 to start by laminated metal sheet 17, wavy expansion is become also larger at top plate portion 2, fold cannot be suppressed completely, therefore utilize drift 6 and eccentric swage 11 start by laminated metal sheet 17 moment to form depth 50% position.In addition, the position that drift 6 and metallic plate 17 contact at first also can not in drift 6 with the scope of eccentric swage 11 by laminated metal sheet 17.
Drift 6 and eccentric swage 11 is preferably utilized to be more than 3MPa by the average pressure (eccentric swage pressure) of laminated metal sheet 17.In it is possible to the generation of the fold suppressed in top plate portion 2 grade.
By above content, according to the present embodiment, when punch forming L-shaped shape parts 1, even if use the high strength steel of the low superhigh intensity of ductility to be used as metallic plate 17, also can not increase molding procedure number and realize the suppression of fold and avoiding of crackle.
In addition, in foregoing, enumerating the overall L-shaped shape parts 1 in L-shaped shape for example is illustrated, but may not be in global shape the parts with L-shaped shape portion, as such parts, can enumerate global shape is roughly the parts of コ word shape, the parts etc. roughly in zigzag shape.
[the second embodiment]
Except having the parts in L-shaped shape portion, for the parts with T-shaped shape portion, the present invention equally also can be suitable for.As the example of parts with T-shaped shape portion, Fig. 9 illustrates the center pillar stiffener (hreinafter referred to as " center pillar 23 ") of body of a motor car (automotivebody).As shown in Figure 9, center pillar 23 possesses: have the T-shaped shape portion of two top view shapes in T shape, top plate portion 25, the longitudinal wall part 27 being formed at the surrounding of top plate portion 25 and the flange part 29 formed continuously with longitudinal wall part 27, and the section of center pillar 23 is as shown in Figure 10 roughly in hat.The global shape of center pillar 23 is by shape connected to each other for the longitudinal edge of two T-shaped shapes.Longitudinal wall part 27 and flange part 29 is not formed at the both ends (horizontal edge end 25a, horizontal edge end 25b, horizontal edge end 25c and horizontal edge end 25d) of the horizontal edge of each T-shaped shape.
Punch-forming mold uses the structure (drift 32 Figure 11 shown in, pressed compact material ring 33 and not shown punch die, eccentric swage) suitable with above-mentioned punch-forming mold 5.Impact forming method also carries out above-mentioned metallic plate arrangement step, metallic plate clamping operation, molding procedure and eccentric swage pressing process respectively.In metallic plate arrangement step, as shown in figure 11, the mode not riding over pressed compact material ring 33 with position 35a, 35b, 35c and the 35d suitable with horizontal edge end 25a, horizontal edge end 25b, horizontal edge end 25c and horizontal edge end 25d of metallic plate 35 configures.The width at the position suitable with the horizontal edge of T-shaped shape of metallic plate 35 is narrower than the width of horizontal edge.In it is possible to avoid to crack and flange part 29 near piece corner produces fold at the shoulder of drift 32.
In eccentric swage pressing process, drift 32 and eccentric swage is utilized to be such as the horizontal edge of T-shaped shape and the linking part 25e of longitudinal edge as shown in the part that thick line in Fig. 9 surrounds by the scope of laminated metal sheet 35.The generation that can press fold thus becomes the position of problem.Also can at more wide scope pressing top plate portion 25.In addition, in eccentric swage pressing process, utilizing drift 32 and eccentric swage to start by the moment of laminated metal sheet 35 can be the condition identical with the situation of above-mentioned L-shaped shape parts 1.In addition, center pillar 23 becomes final component shape by excision (trimming processing (trimming)) unwanted part after punch forming.
Embodiment 1
In order to confirm the action effect of impact forming method of the present invention, carry out concrete experiment.In an experiment, under various punch forming condition, as there are the parts in L-shaped shape portion and the front pillar reinforcement (hreinafter referred to as " front pillar 40 ") of punch forming body of a motor car shown in Figure 12 and Figure 13, to the evaluation respectively striking out shaped piece and carried out fold, crackle.
As shown in figure 12, front pillar 40 has top view in the top plate portion 41 of the L-shaped shape be made up of long limit and minor face, the longitudinal wall part 42 being formed at the surrounding of top plate portion 41 and the flange part 43 formed continuously with longitudinal wall part 42, and the section of front pillar 40 is as shown in figure 13 roughly in hat.Longitudinal wall part 42 and flange part 43 is not formed at the both ends on the long limit of front pillar 40 and the end (minor face end 41a) of minor face.
In the present embodiment, the punch-forming mold shown in Figure 14 and Figure 15 is employed.Figure 14 is counterdie, utilizes cushion pins 44 to support pressed compact material ring 45.The central authorities of pressed compact material ring 45 are provided with opening portion 45a, are configured with drift 47 at opening portion 45a.Figure 15 is patrix, and not shown sliding part is provided with punch die 51, and this punch die 51 has the depressed part 51a inserted for drift 47.Eccentric swage 53 is configured with at the opening portion 51b of bottom surface of the depressed part 51a being arranged at punch die 51.
Eccentric swage 53 links not shown cylinder and produces load, and the extrusion position of eccentric swage 53 adjusts by putting into metal derby (not shown) between sliding part and cylinder.Metallic plate 55 (with reference to Figure 16) uses hot strength 980MPa level and 1180MPa level cold-rolled steel sheet these two kinds, is used as the high strength steel of the low superhigh intensity of ductility.The thickness of slab of metallic plate 55 is 1.4mm.Punch forming makes pressed compact material ring compression (MPa), eccentric swage scope, eccentric swage pressure (MPa), eccentric swage extrusion position (%) and metallic plate configure variation and carry out combining and carrying out under multiple conditions.Above-mentioned condition is as shown in table 1.
[table 1]
[table 1]
In the condition shown in the example of the present invention 1 ~ example 11 of the present invention of table 1, above-mentioned pressed compact material ring compression, eccentric swage scope, eccentric swage pressure, eccentric swage extrusion position and metallic plate configuration all within the scope of the present invention.Condition shown in comparative example 1 ~ comparative example 5 is included in outside the scope of the invention.Below the configuration of pressed compact material ring compression, eccentric swage scope, eccentric swage pressure, eccentric swage extrusion position and metallic plate is described in detail.
Average pressure in the region of the metallic plate 55 that pressed compact material ring compression is clipped by punch die 51 and pressed compact material ring 45, more than 0.7MPa is scope of the present invention.Eccentric swage pressure utilizes drift 47 and the average pressure of eccentric swage 53 by laminated metal sheet 55 in eccentric swage pressing process, and more than 3MPa is scope of the present invention.
For eccentric swage extrusion position, under the state unloading eccentric swage 53, utilize punch die 51 and pressed compact material ring 45 to clip metallic plate 55 as shown in Figure 16, when being provided with eccentric swage 53 in this condition, the position that eccentric swage 53 contacts with metallic plate 55 is 0% position of eccentric swage 53, more closer to the top than initial point is positive direction, be negative direction more on the lower than initial point, form depth is 100% position.In eccentric swage extrusion position, the position of 0% ~ 50% is scope of the present invention.
The configuration of metallic plate 55 as shown in figure 17, exists two kinds.Figure 17 (a) is the situation that the mode not riding over pressed compact material ring 45 with the position 55a suitable with minor face end 41a of metallic plate 55 configures metallic plate 55, and Figure 17 (b) is the situation that the mode riding over pressed compact material ring 45 with the position 55a suitable with minor face end 41a of metallic plate 55 configures metallic plate 55.Configuration shown in Figure 17 (a) is scope of the present invention.
Eccentric swage scope uses the eccentric swage 53 of 3 types shown in Figure 18 to change.Figure 18 (a) is the figure of the part at the position suitable with flexing portion 41b by laminated metal sheet 55, Figure 18 (b) is the figure of the entirety at the pressing position suitable with flexing portion 41b, Figure 18 (c) is the figure of the entirety pressing the position suitable with top plate portion 41.Eccentric swage scope shown in Figure 18 (b) Yu Figure 18 (c) is scope of the present invention.In Figure 18 (b) with Figure 18 (c), the circular shape of eccentric swage 53 is consistent with the circular shape of the flexing portion 41b of top plate portion 41.The part impaled by circular arc D, tangent line L1 and tangent line L2 in Fig. 7 is corresponded to by the part impaled by dotted line and circular arc in the part of enclosed with dashed lines and Figure 18 (b) and Figure 18 (c) in Figure 18 (a).Stamping forming result is carried out as shown in table 2 according to each condition of table 1.
[table 2]
[table 2]
| Condition | Flange part crackle | Flange part fold | Top plate portion fold | Shoulder R portion crackle | Overall merit |
| Example 1 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 2 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 3 of the present invention | ○ | ○ | ◎ | ○ | OK |
| Example 4 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 5 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 6 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 7 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 8 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 9 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 10 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 11 of the present invention | ○ | ◎ | ○ | ○ | OK |
| Comparative example 1 | ○ | × | ○ | ○ | NG |
| Comparative example 2 | ○ | ◎ | × | ○ | NG |
| Comparative example 3 | ○ | ◎ | × | ○ | NG |
| Comparative example 4 | ○ | ◎ | ○ | × | NG |
| Comparative example 5 | ○ | ◎ | × | × | NG |
Assessment item is the crackle in the crackle of flange part 43 and fold, the fold of top plate portion 41 and the shoulder R portion of drift 47.The evaluation of fold is undertaken by visualization.In table 2, the situation cannot observing fold is denoted as ◎, and the situation can observing small fold is denoted as zero, and the situation can observing obvious fold is denoted as ×.In addition, the evaluation of crackle is also undertaken by visualization.In table 2, the situation cannot observing crackle is denoted as zero, and the situation can observing crackle is denoted as ×.And, also carry out the overall merit of fold and crackle.In table 2, evaluate good situations and be denoted as OK, evaluate bad situation and be denoted as NG.
As shown in table 2, in example 1 ~ example 11 of the present invention of the present invention, there is not the crackle in the crackle of flange part 43, shoulder R portion, there is not fold or fold is less, obtain good overall merit.On the other hand, in comparative example 1 ~ comparative example 5, overall merit is bad.In comparative example 1, pressed compact material ring compression is low to moderate 0.3MPa, therefore produces fold at flange part 43.In comparative example 2, eccentric swage pressure is low to moderate 1.0MPa, therefore produces fold at top plate portion 41.In comparative example 3, eccentric swage extrusion position is 75%, utilizes eccentric swage 53 to start by the moment of laminated metal sheet 55 more late, therefore fully cannot suppress the fold of top plate portion 41.In comparative example 4, as shown in Figure 17 (b), the position 55a suitable with minor face end 41a of metallic plate 55 rides over pressed compact material ring 45, therefore cracks in shoulder R portion.In comparative example 5, there is not eccentric swage, therefore produce fold at top plate portion 41, the position 55a suitable with minor face end 41a of metallic plate 55 rides over pressed compact material ring 45, therefore cracks in shoulder R portion.
As mentioned above, in the present embodiment, when punch forming front pillar 40, even if use the high strength steel of the superhigh intensity that ductility is low, also can not increase molding procedure number and realize the suppression of fold and avoiding of crackle.
Embodiment 2
Embodiment 1 is the embodiment for front pillar 40 (having the parts in L-shaped shape portion).Next, in the present embodiment, also the experiment identical with embodiment 1 is carried out to the parts that is center pillar 23 (with reference to Fig. 9 and Figure 10) with T-shaped shape portion, and is described.In the present embodiment, eccentric swage is identical with embodiment 1, links cylinder and produces load, and the adjustment of the extrusion position of eccentric swage is also identical with embodiment 1.In addition, the metallic plate 35 used in experiment is identical with embodiment 1 (the hot strength 980MPa level of thickness of slab 1.4mm and 1180MPa level cold-rolled steel sheet) also.
Punch forming makes pressed compact material ring compression (MPa), eccentric swage pressure (MPa), eccentric swage extrusion position (%) and metallic plate configure variation and carry out combining and carrying out under multiple conditions.The condition of punch forming shown in table 3.Pressed compact material ring compression, eccentric swage pressure and eccentric swage extrusion position are identical with embodiment 1, and therefore the description thereof will be omitted.The configuration of metallic plate 35 as shown in figure 19, exists two kinds.Figure 19 (a) is the situation that the mode not riding over pressed compact material ring 33 with position 35a, 35b, 35c and the 35d suitable with horizontal edge end 25a, horizontal edge end 25b, horizontal edge end 25c and horizontal edge end 25d of metallic plate 35 configures metallic plate 35, and Figure 19 (b) is the situation that the mode riding over pressed compact material ring 33 with position 35a, 35b, 35c and the 35d suitable with horizontal edge end 25a, horizontal edge end 25b, horizontal edge end 25c and horizontal edge end 25d of metallic plate 35 configures metallic plate 35.Configuration shown in Figure 19 (a) is scope of the present invention.In addition, the example of the present invention 12 ~ example 20 of the present invention of table 3, comparative example 6 ~ comparative example 9 whole in, eccentric swage scope is the scope of the linking part 25e that the middle thick line of pressing shown in Fig. 9 surrounds.
[table 3]
[table 3]
As shown in table 3, the condition shown in example 12 ~ example 20 of the present invention of the present invention is the above-mentioned whole condition within the scope of the invention of pressed compact material ring compression, eccentric swage pressure, eccentric swage extrusion position and metallic plate configuration.Comparative example 6 ~ comparative example 9 is the conditions comprised outside the scope of the invention.Stamping forming result is carried out as shown in table 4 according to each condition of table 3.
[table 4]
[table 4]
| Condition | Flange part crackle | Flange part fold | Top plate portion fold | Shoulder R portion crackle | Overall merit |
| Example 12 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 13 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 14 of the present invention | ○ | ○ | ◎ | ○ | OK |
| Example 15 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 16 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 17 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 18 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 19 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Example 20 of the present invention | ○ | ◎ | ◎ | ○ | OK |
| Comparative example 6 | ○ | × | ◎ | ○ | NG |
| Comparative example 7 | ○ | ◎ | × | ○ | NG |
| Comparative example 8 | ○ | ◎ | × | ○ | NG |
| Comparative example 9 | ○ | ◎ | ◎ | × | NG |
The observational technique of table 4 is identical with table 2, and therefore the description thereof will be omitted.As shown in table 4, in example 12 ~ example 20 of the present invention of the present invention, do not exist the crackle of flange part 29 and fold, top plate portion 25 fold and take on the crackle in R portion, obtain good overall merit.On the other hand, in comparative example 6 ~ comparative example 9, overall merit is bad.In comparative example 6, pressed compact material ring compression is low to moderate 0.4MPa, therefore produces fold at flange part 29.In comparative example 7, eccentric swage pressure is low to moderate 1.0MPa, therefore produces fold at top plate portion 25.In comparative example 8, eccentric swage extrusion position is 70%, utilizes eccentric swage to start by the moment of laminated metal sheet 35 more late, therefore cannot suppress the fold of top plate portion 25.In comparative example 9, metallic plate 35 is as shown in Figure 19 (b), position 35a, 35b, 35c and the 35d suitable with horizontal edge end 25a, horizontal edge end 25b, horizontal edge end 25c and horizontal edge end 25d of metallic plate 35 ride over pressed compact material ring 33, therefore crack in shoulder R portion.
As mentioned above, in the present embodiment, when punch forming center pillar 23 (there are the parts in T-shaped shape portion), even if use the high strength steel of the superhigh intensity that ductility is low, also can not increase molding procedure number and realize the suppression of fold and avoiding of crackle.
Above, embodiments of the present invention are illustrated, but the present invention is not limited by the foregoing of the formation of a present embodiment disclosed part of the present invention.That is, other embodiments, embodiment and the application technology etc. that complete according to the present embodiment and by those skilled in the art etc. are all included in category of the present invention.
Industrial utilizes possibility
According to the present invention, even if the high strength steel of the low superhigh intensity of a kind of use ductility can be provided, also can not increase molding procedure number and realize the suppression of fold and the impact forming method avoided of crackle in the parts in T-shaped shape portion with L-shaped shape portion that top view is L-shaped shape or top view shape in T shape.
Description of reference numerals:
D ... circular arc; L1, L2 ... tangent line; S ... area; 1 ... L-shaped shape parts; 2 ... top plate portion; 2a ... minor face end; 2b ... flexing portion; 3 ... longitudinal wall part; 4 ... flange part; 5 ... punch-forming mold; 6 ... drift; 6a ... forming surface; 7 ... punch die; 7a ... depressed part; 7b ... opening portion; 7c ... clamping face; 9 ... pressed compact material ring; 9a ... opening portion; 11 ... eccentric swage; 13 ... backing plate; 15 ... sliding part; 17 ... metallic plate; 17a ... position; 19 ... cushion pins; 21 ... cylinder; 23 ... center pillar; 25 ... top plate portion; 25a, 25b, 25c, 25d ... horizontal edge end; 25e ... linking part; 27 ... longitudinal wall part; 29 ... flange part; 32 ... drift; 33 ... pressed compact material ring; 35 ... metallic plate; 35a, 35b, 35c, 35d ... position; 40 ... front pillar; 41 ... top plate portion; 41a ... minor face end; 41b ... flexing portion; 42 ... longitudinal wall part; 43 ... flange part; 44 ... cushion pins; 45 ... pressed compact material ring; 45a ... opening portion; 47 ... drift; 51 ... punch die; 51a ... depressed part; 51b ... opening portion; 53 ... eccentric swage; 55 ... metallic plate; 55a ... position.
Claims (2)
1. an impact forming method, use has drift, punch die, the punch-forming mold of pressed compact material ring and eccentric swage, stamped metal sheets is molded into and possesses top plate portion, longitudinal wall part and flange part and there are the parts that top view is the L-shaped shape portion of L-shaped shape, described drift has forming surface, described punch die has the forming surface corresponding with this drift, described metallic plate is clamped between described pressed compact material ring and this punch die, described eccentric swage coordinates the part clamping described metallic plate with drift, described longitudinal wall part is formed at around this top plate portion, described flange part and this longitudinal wall part are formed continuously,
The feature of described impact forming method is to have:
Metallic plate arrangement step, the mode not riding over described pressed compact material ring with the position suitable with the end of the minor face of described L-shaped shape of this metallic plate configures described metallic plate;
Metallic plate clamping operation, utilizes described punch die and described pressed compact material ring to clamp to be configured to by this metallic plate arrangement step the described metallic plate on pressed compact material ring;
Molding procedure, is pushed drift relative to the described metallic plate of the state clamped by described punch die and described pressed compact material ring and is processed by drawing and carry out shaping to described metallic plate; And
Eccentric swage pressing process, after described metallic plate clamping operation, utilizes described drift and described eccentric swage to press the position at least comprising the flexing portion of L-shaped shape at the position suitable with described top plate portion of described metallic plate in described molding procedure midway,
The position that this eccentric swage pressing process is being 0% ~ 50% relative to the form depth from the position that described drift contacts with described metallic plate to bottom dead center position in described molding procedure starts,
The average pressure utilizing described punch die and described pressed compact material ring to press described metallic plate in described metallic plate clamping operation is more than 0.7MPa,
The average pressure utilizing described drift and described eccentric swage to press described metallic plate in described eccentric swage pressing process is more than 3MPa.
2. an impact forming method, use has drift, punch die, the punch-forming mold of pressed compact material ring and eccentric swage, stamped metal sheets is molded into and possesses top plate portion, longitudinal wall part and flange part and there are the parts in the T-shaped shape portion of top view shape in T shape, described drift has forming surface, described punch die has the forming surface corresponding with this drift, described metallic plate is clamped between described pressed compact material ring and this punch die, described eccentric swage coordinates the part clamping described metallic plate with drift, described longitudinal wall part is formed at around this top plate portion, described flange part and this longitudinal wall part are formed continuously,
The feature of described impact forming method is to have:
Metallic plate arrangement step, the mode not riding over described pressed compact material ring with the position suitable with the end of the horizontal edge of described T-shaped shape of this metallic plate configures described metallic plate;
Metallic plate clamping operation, utilizes described punch die and described pressed compact material ring to clamp to be configured to by this metallic plate arrangement step the described metallic plate on pressed compact material ring;
Molding procedure, is pushed drift relative to the described metallic plate of the state clamped by described punch die and described pressed compact material ring and is processed by drawing and carry out shaping to described metallic plate; And
Eccentric swage pressing process, after described metallic plate clamping operation, utilize described drift and described eccentric swage to press the position at least comprising the horizontal edge of T-shaped shape and the linking part of longitudinal edge at the position suitable with described top plate portion of described metallic plate in described molding procedure midway
The position that this eccentric swage pressing process is being 0% ~ 50% relative to the form depth from the position that described drift contacts with described metallic plate to bottom dead center position in described molding procedure starts,
The average pressure utilizing described punch die and described pressed compact material ring to press described metallic plate in described metallic plate clamping operation is more than 0.7MPa,
The average pressure utilizing described drift and described eccentric swage to press described metallic plate in described eccentric swage pressing process is more than 3MPa.
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| JP2013-122360 | 2013-06-11 | ||
| JP2013122360A JP5664704B2 (en) | 2013-06-11 | 2013-06-11 | Press forming method |
| PCT/JP2014/061581 WO2014199730A1 (en) | 2013-06-11 | 2014-04-24 | Press molding method |
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| CN114466714A (en) * | 2019-09-30 | 2022-05-10 | 杰富意钢铁株式会社 | Press molding method and press molding device for outer panel for automobile |
| CN114502296A (en) * | 2019-10-02 | 2022-05-13 | 杰富意钢铁株式会社 | Method and apparatus for press forming outer panel for automobile |
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| JP6179527B2 (en) * | 2015-01-16 | 2017-08-16 | Ｊｆｅスチール株式会社 | Press forming method |
| JP6202019B2 (en) * | 2015-02-25 | 2017-09-27 | Ｊｆｅスチール株式会社 | Press forming method |
| WO2016157976A1 (en) * | 2015-03-31 | 2016-10-06 | Ｊｆｅスチール株式会社 | Press molding method, method for manufacturing component in which said press molding method is used, and component manufactured using said press molding method |
| JP6376048B2 (en) * | 2015-06-16 | 2018-08-22 | トヨタ車体株式会社 | Press molding method and press mold |
| WO2017175730A1 (en) | 2016-04-04 | 2017-10-12 | 新日鐵住金株式会社 | Method for producing press-molded article and production line thereof |
| JP6969133B2 (en) * | 2016-05-10 | 2021-11-24 | 日本製鉄株式会社 | Molded body with stretch flange and its manufacturing method |
| CN109952165B (en) | 2016-10-05 | 2020-10-09 | 日本制铁株式会社 | Method and apparatus for manufacturing press-formed article |
| JP2021041447A (en) | 2019-09-13 | 2021-03-18 | トヨタ自動車株式会社 | Manufacturing device and manufacturing method of hat-shaped cross section component having curvature protrusion part |
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Also Published As
| Publication number | Publication date |
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| WO2014199730A1 (en) | 2014-12-18 |
| CN105307792B (en) | 2017-03-08 |
| JP2014240078A (en) | 2014-12-25 |
| KR101688475B1 (en) | 2016-12-21 |
| KR20160003795A (en) | 2016-01-11 |
| JP5664704B2 (en) | 2015-02-04 |
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