CN103464561A - Forming die of skin part for airplane - Google Patents
Forming die of skin part for airplane Download PDFInfo
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- CN103464561A CN103464561A CN2013102339631A CN201310233963A CN103464561A CN 103464561 A CN103464561 A CN 103464561A CN 2013102339631 A CN2013102339631 A CN 2013102339631A CN 201310233963 A CN201310233963 A CN 201310233963A CN 103464561 A CN103464561 A CN 103464561A
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Abstract
The invention relates to a forming die of a skin part for an airplane. The forming die comprises a compression block, a male die, a female die, a binder ring and a pressing plate, wherein the male die comprises a straight wall part and a forming part; the female die is provided with a cavity for holding billets and liquid; the binder ring comprises an upper binder ring and a lower binder ring; the lower binder ring can be slidably located on the female die in the longitudinal direction, and is provided with a second penetrating hollow part adapt to a lower straight wall part; the upper binder ring can be detachably fixed on the lower binder ring, and is provided with a first up-and-down penetrating hollow part; the upper binder ring is detachably connected with a second pressurizing source, so that the compression block and the male die sequentially penetrate through the first hollow part and the second hollow part under the action of a first pressurizing source, and when the forming part of the male die is used for forming the billets in the cavity of the female die, the second pressurizing source presses the upper binder ring and the lower binder ring on the female die. According to the forming die of the skin part for the airplane, the resilience after a part is formed is effectively reduced, and the forming accuracy and the surface quality are improved.
Description
Technical field
The invention belongs to the stress metal processing technique field, particularly relate to the shaping dies of a kind of aircraft by the covering part.
Background technology
Covering is the important vital part that forms Aerodynamic Configuration of Aireraft, because covering directly contacts, directly participates in in-flight stressed and power transmission with air-flow, therefore the manufacture of skin part not only has profile accurately and the requirement of mechanical performance index, and the strict demand of surface quality is also arranged.Skin part is mainly according to factors such as part shape, size, material, thickness, and main forming process comprises drop forming, press-brake forming, roll forming, pull-shaped shaping and traditional drawing and forming etc.
The tradition compression technology shaping thin skin that falls, be shaped with conventional protruding, recessed upper and lower mould, its forming technology flow process: blanking-deburring-quenching-drop forming-metal pattern school shape-shearing clout.The surface quality of workpieces of this process processing is difficult to reach designing requirement, has following shortcoming in the part manufacture: the easy resilience of compacted part, and after falling to pressing, school shape is very difficult, and the part shrinkage is poor, and the gauffer of formation can't be eliminated; After falling to pressing, surface quality of workpieces and the profile degree of accuracy are poor; Fall to pressing that part stress is inhomogeneous very easily makes the plate unstability, thereby occur agitating and buckling deformation.
In nearly decades, the liquid-filling shaping technology is developed rapidly.Liquid-filling shaping refers to and adopts liquid to replace punch or the die of rigidity as the power transmission medium; make blank fit punch or die and be shaped under the effect of power transmission medium; produce fluid lubrication simultaneously between punch and blank surface; reduce harmful frictional resistance; thereby the forming limit of sheet material is greatly improved, can obtain high-quality workpiece.The liquid-filling shaping technology is applied to, in the manufacture of aircraft skin part forming, can effectively solve complex-curved Skin Parts forming quality problem.Present passive type liquid-filling shaping is to adopt die for liquid chamber structure completely, although can effectively reduce reduction.But for the complex thin-wall curved surface covering, because there is " rigid constraint " effect the die entrance porch unlike traditional pull and stretch, easily make blank occur unsettled and cause wrinklingly, and defect is difficult to control.
As can be seen here, the manufacture for aircraft with covering, conventional manufacturing process is all being deposited this certain limitation, for example:
If 1 adopts traditional compression technology that falls covering that is shaped, the easy resilience of part, after falling to pressing, school shape is very difficult, after falling to pressing surface quality of workpieces and the profile degree of accuracy poor, fall to pressing that part stress is inhomogeneous very easily makes the plate unstability, thereby occur agitating and buckling deformation.
If 2 adopt rubber pocket covering forming technology, although only need half contour forming, the easy resilience of part after rubber pocket is shaped, and also springback capacity is wayward, has brought very large impact to the forming accuracy of part.
If 3 adopt vertical pull-shaped forming technology, relatively be applicable to large-scale skin part and be shaped, yet larger stretcher strain amount usually makes skin-surface skid wire or coarse-grain occur and causes covering to scrap, and has affected surface quality and the profile accuracy of covering.
If 4 adopt traditional drawing and forming technique, for dark chamber part skin part, can bring the problems such as complex procedures, work step be various.And the cold drawn dark ratio of material is little, the rear resilience that is shaped is larger, needs to increase school shape operation and solves.
If 5 adopt general liquid-filling shaping technique, die adopts complete liquid chamber structure, can improve the material forming limit, effectively reduces reduction.But, for complex thin-wall curved surface covering part, easily at unsettled place, cause wrinkling, wayward.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of product shaping performance is good, operation is few, forming accuracy the is high aircraft shaping dies by the covering part.
Particularly, this aircraft comprises with the shaping dies of covering part: compact heap, punch, die, blank holder and pressing plate.
More specifically, compact heap is squarely roughly, compact heap comprises surperficial from it upwards protrude out, the die shank for being connected with the first pressurized source, punch comprises vertical wall section and shaped portion, and compact heap is detachably fixed on the vertical wall section of punch so that the alignment of the longitudinal axis of die shank, compact heap and punch; Negative mold is useful on the cavity that holds blank and liquid, at least by the vertical wall section with punch, suitable the second annular wall of suitable the first annular wall, from the first annular wall to downward-extension and shaped portion punch and the 3rd annular wall from the second annular wall to downward-extension limit cavity, and die also has outage and the inlet opening be communicated with layer Cavity Flow; Blank holder comprises blank holder and lower blank holder, wherein, lower blank holder roughly becomes tabular, be positioned at slidably in the vertical on die, its there is the second hollow space of the up/down perforation suitable with the vertical wall section of punch and with the second hollow space, be communicated with and with compact heap suitable, in a longitudinal direction for the locating slot of position housing piece; Upper blank holder removably is fixed on lower blank holder, its one-tenth is tabular, the first hollow space with up/down perforation, upper blank holder for removably being connected with the second pressurized source so that when compact heap and punch under the effect of the first pressurized source successively from the first hollow space and the second hollow space through and while with the shaped portion of punch, the blank in the cavity of die being formed the second pressurized source will blank holder and lower blank holder pressure is put at die.
Roughly become the cuboid body structure after this die assembly.The bottom of compact heap is roughly cube structure, fluted below cube structure, for post gap is inserted in punch top, coordinates guiding.Compact heap top has die shank, and die shank is connected with the first pressurized source, and wherein, this first pressurized source is the hydraulic press master cylinder.Compact heap is connected with the counter sink bolt of punch by four vertical directions, and wherein, bolt hole is through hole in the part of compact heap, and threaded portion is arranged in punch.
Upper blank holder is roughly the rectangular body structure, and there is the first hollow space centre, is convenient to after the flanging operation, and compact heap and punch are descending through forming operation, and wedge angle is cut away in the equal machined of surrounding.The outer along the circumferential direction equal angles of upper blank holder is provided with six metric coarse thread bolts hole, by six hexagon socket head cap screws, with the second pressurized source, is connected, and wherein this second pressurized source is hydraulic press flanging cylinder, by flanging cylinder power transmission flanging.In the middle of going up blank holder, by four counter sink bolts, with lower blank holder, be connected, wherein bolt hole partly is set to through hole at upper blank holder, and its threaded portion is arranged in lower blank holder simultaneously.Lower blank holder is roughly rectangular structure, and centre is the second hollow space, in the middle of upper surface, is provided with four bolts hole, is convenient to be connected with upper blank holder.The shape of the second middle hollow space is consistent with the vertical wall section external surface shape of punch.In addition, the wall of restriction second hollow space of lower blank holder and the lower wall surface of lower blank holder seamlessly transit, particularly, the second hollow space is provided with the fillet of smooth transition along lower blank holder bottom surface section, the purpose that this fillet is set be to be conducive to the to be shaped initial anti-inflation effect of initial stage liquid.Also be provided with the second hollow space, be communicated with and with compact heap suitable, in a longitudinal direction for guiding the locating slot of position housing piece, particularly, this locating slot is located at the top of the second hollow space, for square cavity configuration, its cube structure of being convenient to compact heap enters wherein so that matched in clearance each other.This locating slot is by being limited with the inwall of broad ways along its length, and the outer wall along its length of inner wall section along its length and compact heap matched in clearance slidably wherein, for located lateral.The outer wall of the inner wall section of this locating slot broad ways and the broad ways of compact heap also keeps matched in clearance slidably, for longitudinal register.
Die is roughly rectangular structure, and the bottom broad ways is provided with step, and step is provided with six equidistant metric system coarse thread bolts hole, by six hexagon socket head cap screws and die holder, is fixedly connected.In the middle of die, be the cavity liquid chamber, the external surface shape of the shape of cavity and the vertical wall section of punch is basically identical, and cavity bottom and die lower surface have certain distance simultaneously.The die front portion is provided with inlet opening and outage, and inlet opening and outage are all got through the cavity inner wall surface.The die upper surface is the die joint after punch, blank holder, die matched moulds.Different from general passive liquid-filling shaping mould is, cavity liquid chamber in the middle of die is not straight wall liquid chamber completely, but the part female mould structure of similar traditional pull and stretch is arranged in die upper surface porch, after this structure curved surface and matched moulds, punch shaped portion curved surface is complementary, and the two gap is even.
Pressing plate, for position-limiting action, is connected with the lower wall surface of the restriction locating slot of lower blank holder by the counter sink bolt, and wherein counter sink is through hole in pressing plate, and screwed hole is arranged in lower blank holder.The Main Function that this pressing plate is set is: in the punch idle running, prevent when punch travel is excessive that the part female mould structure that prevents this punch and die gnaws mould.
Be provided with guide between die and lower blank holder, it is for longitudinally sliding the relative die of lower blank holder, and particularly, this guide is alignment pin.Therefore, correspondingly, at die upper surface and lower blank holder lower surface across corner, be arranged with dowel hole.Aforementioned alignment pin is by with die upper surface hole interference fit, being used for location, by coordinating with lower blank holder lower surface interporal lacuna for location and guiding.
The using method of the shaping dies of covering part for a kind of aircraft, mainly comprise the steps:
When step 1, die assembly, be fixed and clamped piece and punch, fixing upper blank holder and lower blank holder, and longitudinally-slidable lower blank holder is navigated on die.Particularly, by compact heap and punch, pass through fastening such as the securing member of counter sink bolt, by pressing plate and lower blank holder, pass through fastening such as the securing member of counter sink bolt, upper blank holder and lower blank holder are by fastening such as the securing member of counter sink bolt, and lower blank holder and die are by the guiding of the guide positions such as alignment pin.
Blank after step 9, taking-up are shaped.
Advantage of the present invention and good effect are:
(1) aircraft provided by the invention is to utilize part former liquid-filling shaping to replace traditional drop forming, roll forming, pull-shaped shaping and traditional drawing and forming with the shaping dies of covering part.Utilize highly pressurised liquid to make workpiece carry out Plastic Forming, compare with traditional drawing and forming, improve forming limit, minimizing number of drawing, minimizing process number and the mould number of dark chamber covering, the reduction expense.
(2) the present invention utilizes highly pressurised liquid to carry out Plastic Forming, utilize " fluid lubrication " and " friction keeps " effect in forming process, improve forming accuracy and surface quality, solved surface quality of workpieces and the poor problem of profile precision in the pull-shaped shaping of traditional drop forming and covering.
(3) the present invention utilizes highly pressurised liquid to act on blank surface, keeps loading the cavity liquid chamber pressure by the later stage, effectively reduce the resilience after part forming, has solved the impact of the forming accuracy that rubber pocket covering Form springback brings.
(4) the present invention carries out Plastic Forming by highly pressurised liquid, improves globality and the plyability of part, reduces the impact of follow-up welding procedure on the part performance;
(5) mould of the present invention utilizes the part female mould structure to combine " friction keeps " and advantage and traditional drawing and forming " rigid constraint " advantage of " fluid lubrication " that liquid-filling shaping has.Improve on the one hand the forming limit of covering, greatly reduced reduction; On the other hand, prevent the unsettled phenomenon of complex-curved covering occurred in general passive type liquid-filling shaping, effectively reduced the wrinkling defect of part overhanging portion.
(6) using method of mould of the present invention is first carried out the flanging operation, the pressure that reloads the cavity liquid chamber is initially anti-inflation to carry out, carry out drawing sequence when then increasing the pressure of cavity liquid chamber, and utilize the part female mould structure to carry out " rigid constraint " to the blank liquid-filling shaping, complete thus the former liquid-filling shaping process of aircraft by the covering part.Mould of the present invention can improve the forming limit of dark chamber covering on the basis of reducing number of drawing, minimizing process number and mould number, reduce the wrinkling defect of covering suspension area simultaneously effectively, have that part globality and plyability are good, forming accuracy and surface quality is high, be shaped after the advantages such as resilience is little.
The accompanying drawing explanation
In order to explain the present invention, its illustrative embodiments will be described with reference to the drawings hereinafter, in accompanying drawing:
The perspective view that Fig. 1 is shaping dies of the present invention;
Fig. 2 is the vertical structure cutaway view after shaping dies assembling of the present invention;
The perspective view that Fig. 3 is shaping dies compact heap of the present invention and punch;
The perspective view that Fig. 4 is blank holder on shaping dies of the present invention;
The perspective view that Fig. 5 is blank holder and pressing plate under shaping dies of the present invention;
The perspective view that Fig. 6 is shaping dies die of the present invention and alignment pin;
The flow chart of steps of the using method that Fig. 7 is shaping dies of the present invention.
Similar features in different figure is by similar Reference numeral indication.
The specific embodiment
In the detailed description of following embodiment, the accompanying drawing that reference forms the part of this description describes.Accompanying drawing shows specific embodiment in the mode of example, and the present invention is implemented in these embodiments.Shown embodiment is not according to all of the embodiments of the present invention for limit.The embodiment that is appreciated that other can be utilized, and change structural or logicality can be made under the prerequisite do not departed from the scope of the present invention.For accompanying drawing, the term of directionality, such as D score, " on " etc., with reference to the orientation of described accompanying drawing using.Because the assembly of embodiments of the present invention can be implemented with multiple orientation, these directional terminology are the purposes for explanation, rather than the purpose of restriction.Therefore, the following specific embodiment is not the meaning as restriction, and scope of the present invention is limited by appending claims.
As depicted in figs. 1 and 2, disclose the former liquid-filling shaping mould of a kind of aircraft by the covering part, be roughly the cuboid box body structure, mainly comprised compact heap 1, punch 2, blank holder and die 5 these several parts.Particularly, blank holder comprises blank holder 3 and lower blank holder 4.
Particularly, the bottom of compact heap 1 is roughly cube structure 11, offers groove 12 below cube structure 11, and this groove 12 inserts post gaps by punch 2 tops and coordinates, for located lateral.The top of compact heap 1 has upwards protruded out die shank 10, die shank 10 and the first pressurized source, the hydraulic press master cylinder cut somebody's hair connected.Punch 2 comprises vertical wall section 13 and shaped portion 14.Compact heap 1 can pass through securing member with punch 2, and for example four counter sink bolts 6 are connected, and wherein bolt hole is through hole in compact heap 1 part, and threaded portion is in punch 2.By this, compact heap 1 is detachably fixed on the vertical wall section 13 of punch 2, so that the alignment of the longitudinal axis of die shank 10, compact heap 1 and punch 2.
As shown in Figure 4 and Figure 5, blank holder comprises blank holder 3 and lower blank holder 4 two parts, and it is tabular that these two parts become substantially.As shown in Figure 4, upper blank holder 3 is roughly the rectangular body structure, and there is the first hollow space of up/down perforation centre, is convenient to after the flanging operation, and compact heap 1 and punch 2 are descending therefrom through forming operation, and wedge angle is cut away in the equal machined of surrounding.Upper blank holder 3 is outer along the circumferential direction is provided with six metric coarse thread bolts hole, and by six hexagon socket head cap screws 7 and the second pressurized source, i.e. the push pedal of hydraulic press flanging cylinder is connected, by flanging cylinder power transmission flanging., in the middle of upper blank holder 3, by four securing members such as counter sink bolt 6, with lower blank holder 4, be connected, the bolt hole wherein matched with this bolt 6 is through hole in upper blank holder 3 parts simultaneously, and its threaded portion is arranged in lower blank holder 4.As shown in Figure 5, lower blank holder 4 also is roughly rectangular structure, the second hollow space 15 that centre is up/down perforation, and the centre of upper surface is provided with four screwed holes, is convenient to be connected with upper blank holder 3.The external surface shape of the vertical wall section 13 of the second hollow space 15 shapes and punch 2 is basically identical, the inwall that limits the second hollow space 15 is transitioned into the lower wall surface of lower blank holder 4 smoothly, particularly, along circumferentially being smoothly transitted into the lower surface of lower blank holder 4, be convenient to the to be shaped initial anti-inflation effect of initial stage liquid of blank holder fillet is set by this second hollow space of level and smooth fillet 15.On cavity 15, part also is provided with locating slot 16, and the cube structure 11 of being convenient to compact heap 1 can enter post gap and coordinate guide-localization.Locating slot 16 inner wall section along its length coordinates with the outer wall glade plane space of compact heap 1 length direction, for located lateral.The inner wall section of locating slot 16 broad ways coordinates with the outer wall glade plane space of compact heap 1 broad ways, for longitudinal register.Locating slot 16 forms the middle whole cavity of lower blank holder together with the second hollow space 15.
As shown in Figure 6, die 5 is roughly rectangular structure, and the bottom broad ways is provided with ledge structure 22, and step is provided with six equidistant metric system coarse thread bolts hole, by six hexagon socket head cap screws 7 and die holder, is fixedly connected.The centre of die 5 has the cavity 19 for receiving fluids, and the shape of vertical wall section 13 outer surfaces of the shape of cavity 19 and punch 2 is basically identical, simultaneously the bottom of cavity 19 and the spaced apart predetermined distance of lower surface of die 5.Particularly, at least by the vertical wall section 13 with punch 2, suitable the second annular wall of suitable the first annular wall, from the first annular wall to downward-extension and shaped portion 14 punch 2 and the 3rd annular wall from the second annular wall to downward-extension limit this cavity 19.The front portion of die 5 is provided with inlet opening 21 and outage 20, and inlet opening 21 and the equal fluid of outage 20 are communicated to the inner wall surface of cavity 19.The upper surface of die 5 is the die joint after punch, blank holder and die matched moulds.Different from general passive liquid-filling shaping mould is, cavitys 19 in the middle of die 5 are not straight wall liquid chambers completely, but there is the part female mould structure 18 of similar traditional pull and stretch in the porch of the upper surface of die 5, after this structure curved surface and matched moulds, shaped portion 14 curved surfaces of punch 2 are complementary, and the two gap is even.
Diagonal angle part at the lower surface of the upper surface of die 5 and lower blank holder 4 is respectively equipped with dowel hole, and correspondingly, the upper surface hole interference fit of alignment pin 9 and die 5 is with for location, with the lower surface interporal lacuna of lower blank holder 4, coordinates with for location with lead.One of ordinary skill in the art will readily recognize that this alignment pin 9 can by other for make the relative die 5 of lower blank holder 4 longitudinally sliding guide piece substitute.
The using method of the former liquid-filling shaping mould of covering part for a kind of aircraft, specifically comprise the steps:
When step 1, die assembly, be fixed and clamped piece 1 and punch 2, fixing upper blank holder 3 and lower blank holder 4, and longitudinally-slidable lower blank holder 3 is navigated on die 5.Particularly, by compact heap 1 and punch 2, pass through fastening such as the securing member of counter sink bolt 6, by pressing plate 8 and lower blank holder 4, pass through fastening such as the securing member of counter sink bolt 6, upper blank holder 3 and lower blank holder 4 are by fastening such as the securing member of counter sink bolt 6, and lower blank holder 4 leads by the guide positions such as alignment pin 9 with die 5.
It is descending that step 6, hydraulic press master cylinder continue descending drive punch 2, and according to the predetermined descending pull and stretch of punch travel curve, liquid chamber pressure increases and also finally reaches maximum liquid chamber pressure according to the loading curve arranged simultaneously.Pull and stretch under " rigid constraint " of part female mould structure 18 effect, when the interface of the vertical wall section 13 of punch 2 and shaped portion 14 overlaps with the die upper surface, complete forming process.
Blank after step 9, taking-up are shaped.
The those skilled in the art of those the art can, by research specification, disclosed content and accompanying drawing and appending claims, understand and implement other changes of the embodiment to disclosing.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In the practical application of invention, part may execute claims the function of middle quoted a plurality of technical characterictics.Any Reference numeral in claim should not be construed as the restriction to scope.
The present invention is limited to the illustrative embodiments presented in specification and accompanying drawing never in any form.Within all combinations of the embodiment that illustrates and describe (part) are interpreted as clearly and are incorporated to this specification and be interpreted as and fall within the scope of the present invention clearly.And, in the scope of the present invention of summarizing as claims, a lot of distortion are possible.In addition, any reference marker in claims should be configured to limit the scope of the invention.
Claims (10)
1. the shaping dies of covering part for an aircraft, is characterized in that, described shaping dies comprises: compact heap (1), punch (2), die (5), blank holder and pressing plate (8), wherein:
Described compact heap (1) is squarely roughly, described compact heap (1) comprises surperficial from it upwards protrude out, the die shank (10) for being connected with the first pressurized source, described punch (2) comprises vertical wall section (13) and shaped portion (14), and described compact heap (1) is detachably fixed to the vertical wall section (13) of described punch (2) above so that the alignment of the longitudinal axis of described die shank (10), described compact heap (1) and described punch (2);
Described die (5) has the cavity (19) for holding blank and liquid, at least by the vertical wall section with described punch (2) (13), suitable the second annular wall of suitable the first annular wall, from described the first annular wall to downward-extension and shaped portions described punch (2) (14) and the 3rd annular wall from described the second annular wall to downward-extension limit described cavity (19), and described die (5) also has outage (20) and the inlet opening (21) be communicated with described cavity (19) fluid;
Described blank holder comprises blank holder (3) and lower blank holder (4), wherein, described lower blank holder (4) roughly becomes tabular, be positioned at slidably in the vertical described die (5) upper, its there is second hollow space (15) of the up/down perforation suitable with the vertical wall section (13) of described punch (2) and with described the second hollow space (15), be communicated with and with described compact heap (1) suitable, the locating slot (16) for locating described compact heap (1) in a longitudinal direction, described upper blank holder (3) removably is fixed on described lower blank holder (4), its one-tenth is tabular, the first hollow space with up/down perforation, described upper blank holder (3) for removably being connected with the second pressurized source so that when described compact heap (1) and described punch (2) under the effect of described the first pressurized source successively from described the first hollow space and described the second hollow space (15) through and while with the shaped portion (14) of described punch (2), the blank cavity (19) of described die (5) in being formed described the second pressurized source blank holder described (3) and described lower blank holder (4) pressure are put in described die (5).
2. the shaping dies of covering part for aircraft according to claim 1, is characterized in that, described the first pressurized source is the hydraulic press master cylinder.
3. the shaping dies of covering part for aircraft according to claim 1, is characterized in that, described the second pressurized source is hydraulic press flanging cylinder.
4. the shaping dies of covering part for aircraft according to claim 1, is characterized in that, the wall of described the second hollow space of the restriction of described lower blank holder (4) (15) and described lower blank holder (4) lower wall surface seamlessly transit.
5. the shaping dies of covering part for aircraft according to claim 1, it is characterized in that, the cavity (19) of described die (5) is formed with female mould structure (18) in the porch of the upper surface of described die (5), the shaped portion (14) of described female mould structure (18) and described punch (2) suitable and the two be evenly spaced apart.
6. the shaping dies of covering part for aircraft according to claim 1, it is characterized in that, the bottom of described compact heap (1) offers groove (12), the outer wall matched in clearance of the inwall of the described groove of restriction (12) of described compact heap (1) and the vertical wall section (13) of described punch (2).
7. the shaping dies of covering part for aircraft according to claim 1, is characterized in that, the inwall of the described locating slot of restriction (16) of described lower blank holder (4) coordinates with the outer wall glade plane space of described compact heap (1).
8. the shaping dies of covering part for aircraft according to claim 1, it is characterized in that, be provided with guide between described die (5) and described lower blank holder (4), it is for longitudinally sliding the relatively described die of described lower blank holder (4) (5).
9. the shaping dies of covering part for aircraft according to claim 8, it is characterized in that, described guide is at least two alignment pins that are fixed on the upper surface of described die (5), correspondingly, the lower surface of described lower blank holder (4) has the hole that quantity is consistent and shape is adaptive with described alignment pin.
10. the shaping dies of covering part for aircraft according to claim 1, it is characterized in that, the upper surface of the restriction locating slot (16) of described lower blank holder also is fixed with pressing plate (8), its for preventing punch (2) to such an extent as to the female mould structure (18) of and described die (5) excessive at the idle running stroke is gnawed mould.
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