CN105537400A - Punching and partial hydraulic composite forming die applicable to large-size automobile covering part - Google Patents

Punching and partial hydraulic composite forming die applicable to large-size automobile covering part Download PDF

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Publication number
CN105537400A
CN105537400A CN201510920526.6A CN201510920526A CN105537400A CN 105537400 A CN105537400 A CN 105537400A CN 201510920526 A CN201510920526 A CN 201510920526A CN 105537400 A CN105537400 A CN 105537400A
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China
Prior art keywords
die
topping
forming
punching
local
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CN201510920526.6A
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Chinese (zh)
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CN105537400B (en
Inventor
龚志辉
展召彬
娄岗
韩磊
陈杰
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Hunan University
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Hunan University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/10Die sets; Pillar guides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002Processes combined with methods covered by groups B21D1/00 - B21D31/00

Abstract

The invention discloses a punching and partial hydraulic composite forming die applicable to a large-size automobile covering part. The forming die comprises a male die, a female die, a blank holder, a base, a liquid-filling rubber bladder, an ejector rod and an elastic device. The male die or the female die is consistent with the part molded surface. The molded surface of the female die or the molded surface of the male die, corresponding to the part molded surface, is the molded surface with small characteristics being removed. The die entity areas corresponding to the corresponding small characteristics are emptied at the same time. The liquid-filling rubber bladder is arranged. The ejector rod is arranged below the rubber bladder and fixedly connected with the base. In the process of forming, the process is divided into a punching forming stage and a hydraulic forming stage. Before forming, the supporting force of the elastic device is adjusted to be larger than the maximum forming force of punching forming and smaller than the maximum pressure provided by a pressing machine, and thus it is ensured that the male die or the female die does not move during punching forming. After punching forming is completed, as a sliding block of the pressing machine moves continuously, the elastic device is compressed, the male die or the female die moves, the liquid-filling rubber bladder is squeezed by the ejector rod, and partial hydraulic forming is conducted through the principle that liquid is incompressible.

Description

Be applicable to the punching press of large-scale auto body panels and local hydraulic pressure composite forming die
Technical field
The present invention relates to a kind of shaping dies being applicable to large-scale auto body panels, be specially and be a kind ofly applicable to the stamping of large-scale auto body panels and local hydraulic pressure composite forming die.
Background technology
Along with the fast development of the industry such as aviation, automobile, the materials application such as aluminium alloy, high-strength steel sheet is increasingly extensive, significantly increases that required precision is high, size is large, drawing depth is dark and shaping difficulty containing the locally large-scale covering of complex characteristic.The stamping major way being current large-scale covering and being shaped, the method applies pressure by the mould be arranged on forcing press to material, makes it produce plastic deformation, obtains the shape of required part.The method process efficiency is high, but often easily occurs drawing crack or wrinkling phenomenon when being shaped for local complex characteristic.Hydroforming is by realizing the shaping of plate as power transmission medium with liquid, effectively can improve the forming property of almag, titanium alloy etc materials, the part that the shape that can be shaped is very complicated, but the method is when the part forming that drawing depth is dark, size is large, the topping up time is long, efficiency is low, and required hydraulic coupling is large, high to matched moulds sealing requirements.
When large-scale covering is stamping, often because parts locally is complex-shaped, during punching press, material flowability is not enough, easily occurs drawing crack or wrinkling phenomenon in local.
Summary of the invention
For the deficiency that prior art exists, the present invention proposes a kind of punching press and the local hydraulic pressure composite forming die that are applicable to large-scale auto body panels, this mould first can complete the shaping of part global shape in once-forming process by punching press, then completed the shaping of local feature by local hydraulic pressure.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of punching press and local hydraulic pressure composite forming die being applicable to large-scale auto body panels, punching press and local hydraulic pressure combined shaping is realized in process that can be once-forming, it is characterized in that mould comprises punching press and local hydroforming two parts, wherein punching course completes the global shape shaping of part, local hydroforming forms for little feature, punching press and hydroforming are carried out continuously, can complete in a stroke.
Further, described punching press and local hydraulic pressure composite forming die, it is characterized in that: punch (4) or die (1) are furnished with elastic device (6) and support, punch (4) or the little feature entity region corresponding to die (1) are emptied, built-in topping up rubber pocket (9), topping up rubber pocket (9) arranged beneath has push rod (5), and push rod and base (7) link together and limit upper and lower motion.
Further, described punch (4) or the little feature corresponding to die (1) need through stamping simulation determination characteristic boundary curves, then carry out emptying of punch (4) or die (1) according to the convexo concave of boundary curve and little feature opposing perimeter curved surface, empty die corresponding to part (1) or punch (4) mould surface portion retains the profile consistent with little feature.
Further, the support force of described elastic device (6) is greater than the maximum plastic force of part punching shaping, is less than forcing press institute applied pressure.Elastic device can adopt the elasticity components and parts such as helical spring, nitrogen spring or hydraulic cylinder.
Further, the amount needs of described topping up rubber pocket (9) institute topping up body (10) are determined according to the position of push rod (5) termination and shape, make the height that topping up rubber pocket (9) keeps consistent with little feature periphery profile before extrusion, topping up rubber pocket also can substitute with not needing the compressible rubber of topping up.
Further, the position of described push rod (5) termination and the determination of shape need to determine according to the stroke of hydroforming, make the deflection of topping up rubber pocket (9) at the end of stroke suitable with little feature containing volume.Simultaneously push rod (5) side and mould entity hole surface engagement better.
Further, when being applied to servo-pressing machine shaping, elastic device (6) can be removed, directly punch (4) is arranged on mold base (7), increase hydraulic pump, after punching stroke terminates, servo-pressing machine carries out pressurize, carries out local hydroforming by hydraulic pump drive hydraulic cylinder to leather bag topping up.
The mould that the present invention relates to takes full advantage of stamping and feature that is hydroforming, effectively can improve the shaping of the large-scale covering with complex characteristic.
Accompanying drawing explanation
Fig. 1 is the covering needing punching press
Fig. 2 is stamping simulation model
Fig. 3 is forming limit diagram
Fig. 4 is the thickness cloud atlas of little characteristic
Fig. 5 is diel model
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention is described:
Fig. 1 is the covering needing punching press, and a little feature is arranged at the top of this part, for being with the convex closure of cross-rib.Impact style adopt die upper, punch under single action forming mode.
Adopt when punching press and hydraulic pressure combined shaping and incite somebody to action, the global shape of part as shown in Figure 2, is obtained by punching press.Part possess character shape as shown in Figure 3, obtained by hydroforming.
When adopting mechanical press to carry out punching press and hydraulic pressure combined shaping, mould structure as shown in Figure 4.During shaping, punch 4 is placed on base support spring 6, the support force of adjustment base support spring 6 exceedes the maximum plastic force of punching press, liquid 10 is comprised by leather bag 9, be arranged within the punch 4 emptied, when making punching press by the amount of predefined hydraulic pressure, hydraulic pressure leather bag is consistent with little feature peripheral curved surface height.Support force due to support spring 6 has exceeded maximum plastic force, and therefore during punching press global feature, punch 4 keeps motionless.After punch 4 and die 1 are in matched moulds state, punching course terminates, and part global shape obtains thereupon.Down motion compresses support spring 6 is continued with forcing press, punch 4, die 1, blank holder 2 and plate 3 continue down to move, and hydraulic mandril 5 is fixed on mold base 7, extruding leather bag 9, because liquid 10 is incompressible, therefore little feature extrudes leather bag 9 by hydraulic pressure 10 and is shaped.
When adopting servo-pressing machine and hydraulic press to carry out punching press and hydraulic pressure combined shaping, mould structure as shown in Figure 5.During shaping, punch 4 is placed on mold base 7 and is maintained static, and liquid 10 is comprised by leather bag 9, is arranged within the punch 4 emptied, and when making punching press by the amount of predefined hydraulic pressure, hydraulic pressure leather bag is consistent with little feature peripheral curved surface height.After punch 4 and die 1 are in matched moulds state, punching course terminates, and part global shape obtains thereupon.Then the pressure holding function of servo-pressing machine and hydraulic press is utilized to carry out pressurize, and between hold period, by hydraulic oil pump 6 pumping hydraulic oil promote from petroleum pipeline 12 to hydraulic jack 5 push rod 11 move upward extruding leather bag 9, because liquid 10 is incompressible, therefore little feature extrudes leather bag 9 by hydraulic pressure 10 and is shaped.

Claims (7)

1. one kind is applicable to the punching press of large-scale auto body panels and local hydraulic pressure composite forming die, it is characterized in that mould comprises stamping and local hydroforming two parts, wherein punching course completes the global shape shaping of part, local hydroforming forms for the local feature of part, stamping and hydroforming is carried out continuously, can complete in a stroke.
2. stamping with local hydraulic pressure composite forming die as claimed in claim 1, it is characterized in that: punch (4) or be furnished with elastic device (6) between die (1) and base (7) and support, punch (4) or the little feature entity region corresponding to die (1) are emptied, built-in topping up rubber pocket (9), topping up rubber pocket (9) arranged beneath has push rod (5), and push rod and base (7) link together and limit moving up and down of topping up leather bag (9).
3. stamping with local hydraulic pressure composite forming die as claimed in claim 1 or 2, punch (4) or the little feature corresponding to die (1) need through stamping simulation determination characteristic boundary curves, then carry out emptying of punch (4) or die (1) according to the convexo concave of boundary curve and little feature opposing perimeter curved surface, the region of punch (4)/die (1) that die (1)/punch (4) etched-off area is corresponding retains the profile consistent with little feature.
4. stamping and local hydraulic pressure composite forming die as claimed in claim 2, the support force of described elastic device (6) is greater than the maximum plastic force of part punching shaping, be less than forcing press institute applied pressure, elastic device can adopt helical spring, nitrogen spring or hydraulic cylinder.
5. stamping with local hydraulic pressure composite forming die as claimed in claim 2, the amount needs of topping up rubber pocket (9) institute topping up body (10) are determined according to the position of push rod (5) termination and shape, make the height that topping up rubber pocket (9) keeps consistent with little feature periphery profile before extrusion, topping up rubber pocket also can substitute with not needing the compressible rubber of topping up.
6. stamping with local hydraulic pressure composite forming die as claimed in claim 2, the position of push rod (5) termination and the determination of shape need to determine according to the stroke of hydroforming, make the deflection of topping up rubber pocket (9) at the end of stroke suitable with little feature containing volume, push rod (5) side and mould entity hole surface engagement simultaneously.
7. the stamping and local hydraulic pressure composite forming die as described in claim 1-6, when being applied to servo-pressing machine or hydraulic press shaping, elastic device (6) can be removed, directly punch (4) or die (1) are arranged on mold base (7); Increase hydraulic pump, after punching stroke terminates, carry out pressurize with servo-pressing machine, by hydraulic pump drive hydraulic cylinder, local hydroforming is carried out to leather bag topping up.
CN201510920526.6A 2015-12-11 2015-12-11 It is applicable to the punching press of large-scale auto body panels and local hydraulic pressure composite forming die Active CN105537400B (en)

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CN105537400B CN105537400B (en) 2018-07-10

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424426A (en) * 2016-12-07 2017-02-22 贵州黎阳航空动力有限公司 Device and method for closing up double-layer wall large-taper inner cone
CN108927453A (en) * 2017-05-25 2018-12-04 株洲时代新材料科技股份有限公司 A kind of spherical surface stainless steel molding die
CN109290456A (en) * 2018-08-02 2019-02-01 哈尔滨飞机工业集团有限责任公司 A kind of rubber pad forming die design method of variable cross-section higher curvature difference radome fairing part
CN113042620A (en) * 2021-03-09 2021-06-29 北京航空航天大学 Bending and bulging composite forming method for small-curvature aluminum alloy skin piece

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JPH02207926A (en) * 1989-02-07 1990-08-17 Suzuki Motor Co Ltd Hydraulic press forming device
JP2004034145A (en) * 2002-07-08 2004-02-05 Toyota Motor Corp Press die
JP2005000946A (en) * 2003-06-11 2005-01-06 Nissan Motor Co Ltd Hydraulic forming machine
JP2006218503A (en) * 2005-02-10 2006-08-24 Nissan Motor Co Ltd Method and apparatus of hydroforming
CN102248066A (en) * 2011-06-09 2011-11-23 北京航空航天大学 Drawing and hydraulic integrated forming method
CN102615484A (en) * 2012-04-25 2012-08-01 湖南大学 Convex-hull type blulletproof helmet forming method
CN102658327A (en) * 2010-12-23 2012-09-12 福特环球技术公司 Method of reducing cycle time in a hydro-mechanical forming process and a tool for hydro-mechanically forming a part
CN102873165A (en) * 2012-09-03 2013-01-16 北京航空航天大学 Shock hydraulic composite forming process for small feature part of complex part

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Publication number Priority date Publication date Assignee Title
JPH02207926A (en) * 1989-02-07 1990-08-17 Suzuki Motor Co Ltd Hydraulic press forming device
JP2004034145A (en) * 2002-07-08 2004-02-05 Toyota Motor Corp Press die
JP2005000946A (en) * 2003-06-11 2005-01-06 Nissan Motor Co Ltd Hydraulic forming machine
JP2006218503A (en) * 2005-02-10 2006-08-24 Nissan Motor Co Ltd Method and apparatus of hydroforming
CN102658327A (en) * 2010-12-23 2012-09-12 福特环球技术公司 Method of reducing cycle time in a hydro-mechanical forming process and a tool for hydro-mechanically forming a part
CN102248066A (en) * 2011-06-09 2011-11-23 北京航空航天大学 Drawing and hydraulic integrated forming method
CN102615484A (en) * 2012-04-25 2012-08-01 湖南大学 Convex-hull type blulletproof helmet forming method
CN102873165A (en) * 2012-09-03 2013-01-16 北京航空航天大学 Shock hydraulic composite forming process for small feature part of complex part

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424426A (en) * 2016-12-07 2017-02-22 贵州黎阳航空动力有限公司 Device and method for closing up double-layer wall large-taper inner cone
CN106424426B (en) * 2016-12-07 2018-01-23 贵州黎阳航空动力有限公司 A kind of double wall steep-taper inner cone closing device
CN108927453A (en) * 2017-05-25 2018-12-04 株洲时代新材料科技股份有限公司 A kind of spherical surface stainless steel molding die
CN109290456A (en) * 2018-08-02 2019-02-01 哈尔滨飞机工业集团有限责任公司 A kind of rubber pad forming die design method of variable cross-section higher curvature difference radome fairing part
CN113042620A (en) * 2021-03-09 2021-06-29 北京航空航天大学 Bending and bulging composite forming method for small-curvature aluminum alloy skin piece

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