CN111086239B - Forming method and forming die for composite material I-beam - Google Patents

Forming method and forming die for composite material I-beam Download PDF

Info

Publication number
CN111086239B
CN111086239B CN201911229260.5A CN201911229260A CN111086239B CN 111086239 B CN111086239 B CN 111086239B CN 201911229260 A CN201911229260 A CN 201911229260A CN 111086239 B CN111086239 B CN 111086239B
Authority
CN
China
Prior art keywords
die
cylindrical
cylindrical mandrel
mandrels
shape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201911229260.5A
Other languages
Chinese (zh)
Other versions
CN111086239A (en
Inventor
田爱琴
孙琳
张联合
高玉龙
丁叁叁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CRRC Qingdao Sifang Co Ltd
Original Assignee
CRRC Qingdao Sifang Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CRRC Qingdao Sifang Co Ltd filed Critical CRRC Qingdao Sifang Co Ltd
Priority to CN201911229260.5A priority Critical patent/CN111086239B/en
Publication of CN111086239A publication Critical patent/CN111086239A/en
Application granted granted Critical
Publication of CN111086239B publication Critical patent/CN111086239B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
    • B29C33/485—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling cores or mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

The invention relates to the field of composite material I-beam forming, and provides a forming method and a forming die for a composite material I-beam, wherein the forming die comprises the following components: the bottom die is provided with a bottom surface and a cavity surrounding the bottom surface, a baffle is arranged on one side of the bottom die, which is positioned in the cavity, and a side opening is arranged on the opposite side of the bottom die, which is positioned in the baffle; the two ends of each cylindrical mandrel are opened, end sockets are sealed at the openings, one end socket is provided with a through hole and connected with an air nozzle device, and the cylindrical mandrels are respectively used for laying prepreg of an I-beam and are placed into the cavity to be butted with the bottom surface and the side surface of the baffle; the insert is used for sealing the side opening and is butted with the side surface of the cylindrical mandrel positioned at the side opening; and the upper die is used for covering the upper surfaces of the pair of cylindrical mandrels. The invention can simplify the die sinking process, uniformly press the blank, and is suitable for forming the I-beam with a complex structure.

Description

Forming method and forming die for composite material I-beam
Technical Field
The invention relates to the technical field of composite material I-beam forming, in particular to a forming method and a forming die for a composite material I-beam.
Background
When the traditional composite material special-shaped I-shaped beam is formed, a multi-purpose male die is used for forming, prepreg is laid on the surfaces of two solid rigid dies, and then an I-shaped blank is formed by bonding. With the more and more extensive engineering application of composite materials, the shapes of the required composite material special-shaped I-shaped beams are more and more complex.
However, the solid metal male die has heavy weight and high cost, the blank is not uniformly pressed during pressing, and when the I-beam with a complex structure is formed, the cavity position of the I-beam clamps the die and the shape of the I-beam is irregular, so the die opening difficulty is high after forming, and even the I-beam cannot be taken out.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method for forming the I-beam made of the composite material, which simplifies the die opening process and ensures that the blank is uniformly pressed, thereby being suitable for forming the I-beam with a complex structure.
The invention further provides a forming die of the composite material I-beam.
The embodiment of the first aspect of the invention provides a method for forming an I-beam made of a composite material, which comprises the following steps:
step 1: molding a pair of cylindrical mandrels with openings at two ends, wherein end sockets are arranged at the openings at two ends of each cylindrical mandrel, the end sockets are hermetically connected with the end parts of the cylindrical mandrels, one of the end sockets at two ends of the pair of cylindrical mandrels is provided with a through hole, and the through hole is connected with an air nozzle device;
step 2: respectively paving the prepreg of the I-shaped beam on the pair of cylindrical mandrels according to a preset paving sequence;
and step 3: placing the pair of cylindrical mandrels paved with the prepreg in the step 2 into a die by abutting against a lower die in sequence, bonding adjacent sides of the pair of cylindrical mandrels to form a blank of an I-beam, placing an insert from an opening on the side edge of the die, packaging the pair of cylindrical mandrels in the die, and covering an upper die;
and 4, step 4: heating and pressurizing the die according to a set mode, and simultaneously supplying pressure to the cylindrical mandrel by connecting the air nozzle device with an air pipe so as to pressurize the blank body of the I-shaped beam;
and 5: and after the blank body of the I-beam is formed, when the temperature is reduced to a set temperature, the softened cylindrical mandrel is drawn out from the die, the upper die and the insert block are opened, and the formed I-beam is taken out.
According to one embodiment of the invention, the step of molding a pair of cylindrical mandrels with both ends open comprises 3D printing the required cylindrical mandrels;
the cylindrical mandrel is made of homogeneous materials and is soft at the temperature of more than 90 ℃.
According to an embodiment of the present invention, in step 5, the set temperature is a temperature at which the cylindrical mandrel is in a soft state.
According to one embodiment of the invention, the step of installing end enclosures at the openings at the two ends of each cylindrical mandrel comprises the step of connecting the outer surfaces of the two end enclosures with the inner walls of the openings at the corresponding ends of the cylindrical mandrels in a sealing manner.
According to one embodiment of the invention, the cylindrical mandrel is shaped into an arc shape along the length direction, grooves are respectively machined on the upper surface and the lower surface of the cylindrical mandrel, the axial direction of each groove is along the width direction of the cylindrical mandrel, the shapes of the upper surface and the lower surface of the cylindrical mandrel are matched with the blank shape of the I-beam, the shape of the bottom surface of the die is matched with the shape of the lower surface of the cylindrical mandrel, and the shape of the lower surface of the upper die is matched with the shape of the upper surface of the cylindrical mandrel.
According to one embodiment of the invention, the step of respectively spreading the prepreg of the i-beam on the pair of cylindrical mandrels according to a preset laying sequence comprises the following steps: the method comprises the steps of firstly, respectively paving prepreg of an I-shaped beam around the top surface, the side surfaces and the bottom surface of each cylindrical mandrel, wherein the side surfaces are adjacent to the cylindrical mandrels, then paving a layer of prepreg of a top layer I-shaped beam along the top surfaces of the cylindrical mandrels, and paving a layer of prepreg of a bottom layer I-shaped beam along the bottom surfaces of the cylindrical mandrels.
According to one embodiment of the invention, the step of heating and pressurizing the die according to the set mode comprises the step of placing the die on a table of a hot press machine for heating and pressurizing according to the set mode.
According to one embodiment of the invention, the end sockets provided with the through holes are located at the same end of a pair of cylindrical mandrels.
The embodiment of the second aspect of the invention provides a forming die for an I-beam made of composite materials, which comprises:
the bottom die is provided with a bottom surface and a die cavity surrounding the bottom surface, a baffle is arranged on one side of the bottom die, which is positioned in the die cavity, and a side opening is arranged on the opposite side of the bottom die, which is positioned in the baffle;
the pair of cylindrical mandrels are respectively used for laying prepreg of an I-shaped beam and are placed in the cavity to be butted with the bottom surface and the side surface of the baffle;
the insert is used for sealing the side opening and is butted with the side surface of the cylindrical mandrel positioned at the side opening;
and the upper die is used for covering the upper surfaces of the pair of cylindrical mandrels.
According to one embodiment of the invention, the cylindrical mandrel is arc-shaped along the length direction, grooves are respectively machined in the upper surface and the lower surface of the cylindrical mandrel, the axial direction of each groove is along the width direction of the cylindrical mandrel, the shapes of the upper surface and the lower surface of the cylindrical mandrel are matched with the blank shape of the I-beam, the shape of the bottom surface of the bottom die is matched with the shape of the lower surface of the cylindrical mandrel, and the shape of the lower surface of the upper die is matched with the shape of the upper surface of the cylindrical mandrel.
According to one embodiment of the invention, the bottom die is provided with cutting plates respectively arranged on two sides of the cylindrical mandrel in the length direction, the cutting plates are configured with two notches arranged side by side, a partition plate is formed between the two notches, the partition plate extends upwards along the bottom surface of the notch, and two ends of a pair of cylindrical mandrels are separated by the partition plate;
the air nozzle device is used for being connected with an air pipe.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
according to the forming method of the composite material I-beam, disclosed by the embodiment of the invention, the hollow mandrel mould is used for replacing a solid metal male mould, so that the mould manufacturing difficulty, the manufacturing cost and the mould weight are reduced; and when the temperature is reduced to the set temperature, the softened cylindrical mandrel is drawn out from the die, the formed I-beam is completely left in the cavity of the die, the upper die and the insert block are opened, and the formed I-beam is taken out, so that the die opening process is simplified, the blank is uniformly pressed, and the die is suitable for forming the I-beam with a complex structure.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic perspective view of an open upper die of a forming die for an i-beam made of composite material according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an i-beam made of composite materials and placed in a forming mold according to an embodiment of the present invention;
FIG. 3 is an axial cross-sectional view of a forming die for an I-beam made of composite materials according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a forming die for an I-beam of composite material according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a cylindrical mandrel in a forming die for an i-beam made of composite materials according to an embodiment of the present invention.
Reference numerals:
1: a cylindrical mandrel; 2: sealing the end; 201: a first end enclosure; 202: a second end enclosure; 203: a third end enclosure; 204: a fourth end enclosure; 3: an upper die; 4: a lower die; 401: a first cutting plate; 402: a second cutting plate; 403: a baffle plate; 5: an insert; 6: a through hole; 7: prepreg of the I-beam; 701: a first prepreg layer; 702: a second prepreg layer; 703: a third prepreg layer; 704: a fourth prepreg layer.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In a first aspect, an embodiment of the present invention provides a method for forming an i-beam made of a composite material, which is shown in fig. 1 to 5, and includes the following steps:
step 1: molding the core shaft: the equal open-ended a pair of tube-shape dabber 1 in both ends is moulded out, specifically, tube-shape dabber 1 forms the cavity of both ends intercommunication, forms hollow dabber, every tube-shape dabber 1's both ends opening part all installs head 2, is first head 201, second head 202, third head 203 and fourth head 204 in proper order, head 2 all with tube-shape dabber 1's end sealing connection for seal the opening, it is a pair of tube-shape dabber 1's both ends one in the head 2 all is equipped with through-hole 6, that is to say, the head 2 of one of them one end of every tube-shape dabber 1 is equipped with through-hole 6, air nozzle device is connected to through-hole 6, and air nozzle device can connect the tuber pipe and supply pressure in to tube-shape dabber 1's cavity, also be exactly for tube-shape dabber 1's cavity provides pressure.
Here, it should be noted that the cross section of the cylindrical mandrel 1 may be rectangular, square, circular, oval, etc., and the specific shape may be selected according to the shape of the i-beam to be formed.
Step 2: preforming an I-shaped beam: the prepreg 7 of the I-beam is respectively laid on a pair of the cylindrical mandrels 1 according to a preset laying sequence, of course, in order to form the I-beam, the prepreg 7 of the I-beam is half-wrapped around each cylindrical mandrel 1, namely, prepreg layers which are in a concave shape, namely, a left half and a right half of an I-shape, are laid on the outer surface of the cylindrical mandrel 1 instead of a U-shape prepreg layer, so that the two cylindrical mandrels 1 are butted side by side left and right, and the I-shape is formed.
Here, the prepreg is a composition in which continuous fibers or a woven fabric are impregnated with a resin matrix under strictly controlled conditions to form a resin matrix and a reinforcement, and is an intermediate material for producing a composite material.
And step 3: die assembly: placing the pair of cylindrical mandrels 1 paved with the prepreg in the step 2 into a die by abutting against a lower die 4 in sequence, bonding the adjacent sides of the pair of cylindrical mandrels 1 to form a blank of an I-beam, placing an insert 5 from an opening on the side edge of the die, packaging the pair of cylindrical mandrels 1 in the die, and covering an upper die 3;
and 4, step 4: i-beam curing and forming: heating and pressurizing the die according to a set mode, and simultaneously supplying pressure to the cylindrical mandrel 1 through the air nozzle device and the air pipe to pressurize the blank body of the I-shaped beam;
and 5: cooling and demolding: after the blank body of the I-beam is formed, when the temperature is reduced to a set temperature, the softened cylindrical mandrel 1 is drawn out from the die, the formed I-beam is completely left in the cavity of the die, the upper die 3 and the insert 5 are opened, and the formed I-beam is taken out. Therefore, the die sinking process is simplified, the blank is uniformly pressed, and the die sinking device is suitable for forming the I-beam with a complex structure.
According to an embodiment of the present invention, the step of molding a pair of cylindrical mandrels 1 with both ends open includes 3D printing a desired cylindrical mandrel 1; the 3D printing molding hollow core shaft mold with controllable hardness is adopted to replace a solid metal male mold, so that the mold manufacturing difficulty, the manufacturing cost and the mold weight are reduced.
Of course, the cylindrical mandrel 1 is not necessarily manufactured by 3D printing, and if a material which softens with the temperature rise and has certain ductility at a higher temperature (such as 90 ℃) is manufactured by other methods, the same effect can be achieved when the material is molded instead of the homogeneous cylindrical mandrel 1 material which is manufactured by 3D printing.
The cylindrical mandrel 1 is made of a homogeneous material and is soft at 90 ℃ or higher, for example, a silicone modified material, but may be made of other materials that soften with an increase in temperature and have ductility at a relatively high temperature (for example, 90 ℃). Further, the diameter of the cylindrical mandrel 1 is between 300 and 600mm, is soft at a temperature higher than about 90 ℃, can be expanded appropriately, and is hard at normal temperature.
According to an embodiment of the present invention, in step 5, the set temperature is a temperature at which the cylindrical mandrel 1 is in a soft state, and in this embodiment, the set temperature is about 90 ℃.
According to an embodiment of the present invention, as shown in fig. 3, the step of installing the end sockets 2 at the openings at the two ends of each cylindrical mandrel 1 includes hermetically connecting the outer surfaces of the two end sockets 2 with the inner walls of the openings at the corresponding ends of the cylindrical mandrel 1, that is, the end sockets 2 and the openings at the two ends of the cylindrical mandrel 1 can be connected in an interference fit manner, so as to achieve the hermetic connection.
In order to form a special-shaped i-beam structure, as shown in fig. 1 and 5, in a specific embodiment, the cylindrical mandrel 1 is shaped into an arc shape along the length direction, grooves are respectively machined on the upper surface and the lower surface of the cylindrical mandrel 1, the axial direction of the grooves is along the width direction of the cylindrical mandrel 1, the shapes of the upper surface and the lower surface of the cylindrical mandrel 1 are matched with the blank shape of an i-beam to be formed, that is, the upper surface and the lower surface of the blank of the i-beam are arc-shaped and provided with grooves, the shape of the bottom surface of the mold is matched with the shape of the lower surface of the cylindrical mandrel 1, so that the lower surface of the cylindrical mandrel 1 is matched and butted with the bottom surface of the mold to form the lower surface of the i-beam, the shape of the lower surface of the upper mold 3 is matched with the shape of the upper surface of the cylindrical mandrel 1, so that the upper surface of the cylindrical mandrel 1 is matched and butted with the lower surface of the upper mold 3, to form the upper surface of the i-beam. The paving parts are bonded to form the required irregular arc I-beam.
According to an embodiment of the present invention, the step of spreading the prepreg 7 of the i-beam on the pair of cylindrical mandrels 1 in a preset laying order includes: firstly, respectively paving prepreg 7 of an I-beam around the top surface, the side surfaces and the bottom surface of each cylindrical mandrel 1, wherein the side surfaces are adjacent to a pair of cylindrical mandrels 1, namely, concave shapes with the openings facing to the left side or the right side are formed, a first prepreg layer 701 and a second prepreg layer 702 are formed, namely, the left side or the right side of the I-beam shape is formed, then paving a layer of prepreg 7 of a bottom layer I-beam along the bottom surfaces of the pair of cylindrical mandrels 1, paving a complete layer of the prepreg 7 of the bottom layer I-beam along the bottom surfaces of the two concave shapes to form a third prepreg layer 703, sealing the middle joint of the two concave shapes perfectly, paving a layer of prepreg 7 of a top layer I-beam along the top surfaces of the pair of cylindrical mandrels 1 to form a fourth prepreg layer 704, and paving a complete layer of the prepreg 7 of the top layer I-beam along the top surfaces of the two concave shapes, the joint between the two "concave" shapes is also perfectly sealed, thus forming a complete i-beam on the surface of the cylindrical mandrel 1.
According to an embodiment of the present invention, the step of heating and pressurizing the mold according to a set manner includes placing the mold on a table of a hot press machine to heat and pressurize the mold according to a set manner, where the set manner can be obtained by programming the hot press machine, and the heating temperature and the pressurizing pressure can be set as required.
In order to facilitate simultaneous air supply and pressurization of the two cylindrical mandrels 1 on the same side, for example, two branch pipes of the same air supply pipeline are respectively connected with the two through holes 6, according to one embodiment of the invention, the end enclosure 2 provided with the through holes 6 is positioned on the same end of the pair of cylindrical mandrels 1, so that the operation is convenient.
In one specific embodiment, the i-beam is made of a composite material and is irregular in shape, and the i-beam is horizontally placed as a standard: the height of the I-beam is between 300 and 500mm, the width of the upper surface and the lower surface is between 300 and 600mm, and the thickness of the upper surface and the lower surface is between 1mm and 3 mm.
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
The first embodiment is as follows:
a forming process of an I-beam made of composite materials comprises the following steps:
step 1: molding the core shaft; 3D printing a needed cylindrical mandrel 1, wherein the shape of the cylindrical mandrel 1 is matched with that of an inner cavity of the I-beam and a mold, metal seal heads 2 are arranged at two ends of the cylindrical mandrel 1, one end of the cylindrical mandrel 1 is sealed, and the other end of the cylindrical mandrel 1 is connected with an air nozzle device through the seal head 2 with a round hole;
and 2, step: performing an I-beam; respectively paving the prepreg 7 of the I-beam at the corresponding positions of the two mandrels according to the designed paving sequence;
and 3, step 3: closing the mold; sequentially abutting the cylindrical mandrels 1 after material pasting against a lower die 4, placing the cylindrical mandrels 1 into a die, symmetrically connecting the two cylindrical mandrels 1, bonding to form a blank of an I-beam, placing the inserts 5, and covering the upper die 3;
and 4, step 4: solidifying and molding the I-beam; putting the die on a hot press machine table, heating and pressurizing according to a set system, and simultaneously pressurizing the inside of the I-beam by the nylon air pipe through the cylindrical mandrel 1;
and 5: cooling and demolding; and after the forming is finished, taking out the die when the temperature is reduced to about 90 ℃, drawing out the softened cylindrical mandrel 1 from the die, opening the upper die 3 and the insert 5, and taking out the formed I-beam.
The I-beam is made of composite materials and has a complex structure, and the I-beam is horizontally arranged in an I shape: the height of the I-beam is 300mm, the width of the upper surface and the lower surface is 300mm, and the thickness of the upper surface and the lower surface is 1 mm.
The cylindrical mandrel 1 is an irregular cylindrical homogeneous material, has a diameter of 300mm, is soft at a temperature higher than about 90 ℃, and can be expanded properly.
Example two:
a forming process of an I-beam made of composite materials comprises the following steps:
step 1: molding the core shaft; 3D printing a needed cylindrical core shaft 1, wherein the shape of the cylindrical core shaft 1 is matched with that of an inner cavity of an I-beam and a mold, metal seal heads 2 are arranged at two ends of the cylindrical core shaft 1, one end of the cylindrical core shaft 1 is sealed, and the other end of the cylindrical core shaft 1 is connected with an air nozzle device through the seal head 2 with a round hole;
step 2: performing I-shaped beam; respectively paving the prepreg 7 of the I-shaped beam at the corresponding positions of the two cylindrical mandrels 1 according to the designed layering sequence;
and step 3: closing the mold; sequentially placing the cylindrical mandrels 1 which are stuck with the materials into a mould close to a lower mould 4, symmetrically connecting the two cylindrical mandrels 1 to form a blank of an I-shaped beam, placing the inserts 5, and covering an upper mould 3;
and 4, step 4: solidifying and molding the I-beam; putting the die on a hot press machine table, heating and pressurizing according to a set system, and simultaneously pressurizing the inside of the I-beam by the nylon air pipe through the cylindrical mandrel 1;
and 5: cooling and demolding; and after the forming is finished, taking out the die when the temperature is reduced to about 90 ℃, drawing out the softened cylindrical mandrel 1 from the die, opening the upper die 3 and the insert 5, and taking out the formed I-beam.
The I-beam is made of composite materials and has a complex structure, and the I-beam is horizontally arranged in an I shape: the height of the I-beam is 400mm, the width of the upper surface and the lower surface is 450mm, and the thickness of the upper surface and the lower surface is 2 mm.
The cylindrical mandrel 1 is an irregular cylindrical homogeneous material, has a diameter of 450mm, is soft at a temperature higher than about 90 ℃, and can be expanded properly.
Example three:
a forming process of an I-beam made of composite materials comprises the following steps:
step 1: molding the mandrel; 3D printing a needed cylindrical mandrel 1, wherein the shape of the cylindrical mandrel 1 is matched with that of an inner cavity of the I-beam and a mold, metal seal heads 2 are arranged at two ends of the cylindrical mandrel 1, one end of the cylindrical mandrel 1 is sealed, and the other end of the cylindrical mandrel 1 is connected with an air nozzle device through the seal head 2 with a round hole;
step 2: performing an I-beam; respectively paving the prepreg 7 of the I-shaped beam at the corresponding positions of the two cylindrical mandrels 1 according to the designed layering sequence;
and step 3: closing the mold; sequentially abutting the cylindrical mandrels 1 after material pasting against a lower die 4, placing the cylindrical mandrels 1 into a die, symmetrically connecting the two cylindrical mandrels 1, bonding to form a blank of an I-beam, placing the inserts 5, and covering the upper die 3;
and 4, step 4: solidifying and molding the I-beam; putting the die on a hot press machine table, heating and pressurizing according to a set system, and simultaneously pressurizing the inside of the I-beam by the nylon air pipe through the cylindrical mandrel 1;
and 5: cooling and demoulding; and after the forming is finished, taking out the die when the temperature is reduced to about 90 ℃, drawing out the softened cylindrical mandrel 1 from the die, opening the upper die 3 and the insert 5, and taking out the formed I-beam.
The I-beam is made of composite materials and has a complex structure, and the I-beam is horizontally arranged in an I shape: the height of the I-beam is 500mm, the width of the upper surface and the lower surface is 600mm, and the thickness of the upper surface and the lower surface is 3 mm.
The cylindrical mandrel 1 is an irregular cylindrical homogeneous material with a diameter of 600mm, is soft at a temperature higher than about 90 ℃ and can be expanded properly.
For the I-beam with a complex structure, a hollow mandrel is used as a male die in a die cavity, and the hollow mandrel is molded into the shape of the required male die through 3D printing. The hollow core shaft replaces a solid metal male die, so that the manufacturing difficulty, the manufacturing cost and the weight of the die are reduced. The hollow core shaft is softened at the temperature of about 90 ℃ or higher, and can be directly drawn out of the die, so that the die opening process is simplified, and the method is suitable for forming the I-beam with a complex structure.
In a second aspect, as shown in fig. 1 to 5, an embodiment of the present invention further provides a forming mold for an i-beam made of a composite material, including:
the bottom die is provided with a bottom surface serving as a reference surface and a cavity surrounding the bottom surface, a baffle 403 is arranged on one side of the bottom die, and a side opening is arranged on the opposite side of the bottom die, which is located on the baffle 403;
the pair of cylindrical mandrels 1 are provided with openings at two ends of each cylindrical mandrel 1, end sockets 2 are sealed at the openings, one end socket 2 is provided with a through hole 6 and is connected with an air nozzle device, and the pair of cylindrical mandrels 1 are respectively used for laying prepreg 7 of an I-shaped beam and are placed in the cavity to be butted with the bottom surface and the side surface of the baffle 403;
the insert 5 is used for closing the side opening, and the insert 5 is used for being butted with the side surface of the cylindrical mandrel 1 positioned at the side opening;
and the upper die 3 is used for covering the upper surfaces of the pair of cylindrical mandrels 1, the upper surface of the upper die 3 is a plane, and the lower surface of the upper die is matched with the surface of the cylindrical mandrel 1 of the prepreg 7 paved into the character beam.
According to an embodiment of the present invention, as shown in fig. 5, the cylindrical mandrel 1 is arc-shaped along a length direction thereof, grooves are respectively machined on an upper surface and a lower surface of the cylindrical mandrel 1, axial directions of the grooves are along a width direction of the cylindrical mandrel 1, shapes of the upper surface and the lower surface of the cylindrical mandrel 1 are matched with a blank shape of the i-beam, a shape of a bottom surface of the bottom die is matched with a shape of the lower surface of the cylindrical mandrel 1, and a shape of the lower surface of the upper die 3 is matched with a shape of the upper surface of the cylindrical mandrel 1. Correspondingly, the baffle 403 and the insert 5 are also provided with an open slot on the upper surface, the size and shape of the open slot are consistent with those of the surface groove of the prepreg layer on the upper surface of the cylindrical mandrel 1 after the prepreg 7 of the finished joist is laid, so that a through slot is formed, the shape of the through slot is consistent with that of the lower surface male die of the upper die 3, correspondingly, the bottom surface of the bottom die is provided with a male die protruding upwards, and the shape of the male die is consistent with that of the surface groove of the prepreg layer on the lower surface of the cylindrical mandrel 1 after the prepreg 7 of the finished joist is laid.
In order to facilitate the cylindrical mandrel 1 to be drawn out after the i-beam is formed, in one embodiment of the present invention, the bottom die is provided with cutting plates, specifically a first cutting plate 401 and a second cutting plate 402, on two sides of the cylindrical mandrel 1 in the length direction, the cutting plates are configured with two parallel notches, a partition is formed between the two notches, the partition extends upward along the bottom surface of the notch, the two ends of the pair of cylindrical mandrels 1 are separated by the partition, the extending direction of the partition is along the axial direction of the cylindrical mandrel 1, the thickness of the partition is not too thick, and the partition can be adapted to a gap between the two cylindrical mandrels 1.
Specifically, the partition plate can be formed by cutting the notches at the two ends of the bottom die and reserving the partition plate in the middle.
The air faucet device is used for being connected with an air pipe, such as a nylon air pipe, air pressure is provided for the air faucet device through the nylon air pipe, the air faucet device is connected to the through hole 6, and air pressure is provided for a cavity of the cylindrical core shaft 1.
According to the embodiment of the invention, the hollow mandrel die which can be molded by 3D printing and has controllable hardness is adopted to replace a solid metal male die, so that the manufacturing difficulty, the manufacturing cost and the die weight of the die are reduced; the hardness of the hollow core shaft changes along with the temperature, and the hollow core shaft is taken out when in a softening state after being formed, so that the die sinking process is simplified, and the blank is uniformly pressed, thereby being suitable for forming the I-beam with a complex structure.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims (6)

1. A forming method of a composite material I-beam is characterized by comprising the following steps:
step 1: molding a pair of cylindrical mandrels with openings at two ends, wherein end sockets are arranged at the openings at two ends of each cylindrical mandrel, the end sockets are hermetically connected with the end parts of the cylindrical mandrels, one of the end sockets at two ends of the pair of cylindrical mandrels is provided with a through hole, and the through hole is connected with an air nozzle device;
step 2: respectively paving prepreg of the I-beam on the pair of cylindrical mandrels according to a preset paving sequence;
and step 3: placing the pair of cylindrical mandrels paved with the prepreg in the step 2 into a die by abutting against a lower die in sequence, bonding adjacent sides of the pair of cylindrical mandrels to form a blank of an I-beam, placing an insert from an opening on the side edge of the die, packaging the pair of cylindrical mandrels in the die, and covering an upper die;
and 4, step 4: heating and pressurizing the die according to a set mode, and simultaneously supplying pressure to the cylindrical mandrel by connecting the air nozzle device with an air pipe so as to pressurize the blank body of the I-shaped beam;
and 5: after the blank body of the I-beam is formed, when the temperature is reduced to a set temperature, the softened cylindrical mandrel is drawn out from the die, the upper die and the insert block are opened, and the formed I-beam is taken out;
the cylindrical mandrel is shaped into an arc shape along the length direction, grooves are respectively machined in the upper surface and the lower surface of the cylindrical mandrel, the axial direction of each groove is along the width direction of the cylindrical mandrel, the shapes of the upper surface and the lower surface of the cylindrical mandrel are matched with the shape of a blank of the I-shaped beam, the shape of the bottom surface of the die is matched with the shape of the lower surface of the cylindrical mandrel, and the shape of the lower surface of the upper die is matched with the shape of the upper surface of the cylindrical mandrel;
the step of molding a pair of cylindrical mandrels with openings at two ends comprises the step of printing the required cylindrical mandrels through 3D;
the cylindrical mandrel is made of homogeneous materials and is soft at the temperature of more than 90 ℃;
the step of respectively paving the prepreg of the I-beam on the pair of cylindrical mandrels according to a preset paving sequence comprises the following steps of: the method comprises the steps of firstly, respectively paving prepreg of an I-shaped beam around the top surface, the side surfaces and the bottom surface of each cylindrical mandrel, wherein the side surfaces are adjacent to the cylindrical mandrels, then paving a layer of prepreg of a top layer I-shaped beam along the top surfaces of the cylindrical mandrels, and paving a layer of prepreg of a bottom layer I-shaped beam along the bottom surfaces of the cylindrical mandrels.
2. The method according to claim 1, wherein in step 5, the set temperature is a temperature at which the cylindrical mandrel is in a soft state.
3. The method according to claim 1, wherein the step of mounting end sockets at openings at both ends of each cylindrical mandrel comprises hermetically connecting outer surfaces of the two end sockets with inner walls of openings at corresponding ends of the cylindrical mandrel.
4. The method for forming the composite i-beam according to claim 1, wherein the step of heating and pressurizing the mold in a set manner comprises placing the mold on a hot press machine for heating and pressurizing in a set manner.
5. The method of claim 1, wherein the end sockets provided with the through holes are located at the same end of a pair of the cylindrical mandrels.
6. The utility model provides a forming die of combined material I-beam which characterized in that includes:
the bottom die is provided with a bottom surface and a die cavity surrounding the bottom surface, a baffle is arranged on one side of the bottom die, which is positioned in the die cavity, and a side opening is arranged on the opposite side of the bottom die, which is positioned in the baffle;
the pair of cylindrical mandrels are respectively used for laying prepreg of an I-shaped beam and are placed in the cavity to be butted with the bottom surface and the side surface of the baffle;
the insert is used for sealing the side opening and is butted with the side surface of the cylindrical mandrel positioned at the side opening;
the upper die is used for covering the upper surfaces of the pair of cylindrical mandrels;
the upper die comprises a cylindrical mandrel, a bottom die and an upper die, wherein the cylindrical mandrel is arc-shaped along the length direction of the cylindrical mandrel, grooves are respectively machined in the upper surface and the lower surface of the cylindrical mandrel, the axial direction of each groove is along the width direction of the cylindrical mandrel, the shapes of the upper surface and the lower surface of the cylindrical mandrel are matched with the shape of a blank of the I-beam, the shape of the bottom surface of the bottom die is matched with the shape of the lower surface of the cylindrical mandrel, and the shape of the lower surface of the upper die is matched with the shape of the upper surface of the cylindrical mandrel;
the bottom die is provided with cutting plates on two sides of the cylindrical mandrel in the length direction, the cutting plates are provided with two parallel notches, a partition plate is formed between the two notches, the partition plate extends upwards along the bottom surfaces of the notches, and the partition plate separates two ends of the cylindrical mandrel;
the air nozzle device is used for connecting an air pipe.
CN201911229260.5A 2019-12-04 2019-12-04 Forming method and forming die for composite material I-beam Active CN111086239B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911229260.5A CN111086239B (en) 2019-12-04 2019-12-04 Forming method and forming die for composite material I-beam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911229260.5A CN111086239B (en) 2019-12-04 2019-12-04 Forming method and forming die for composite material I-beam

Publications (2)

Publication Number Publication Date
CN111086239A CN111086239A (en) 2020-05-01
CN111086239B true CN111086239B (en) 2022-05-27

Family

ID=70394733

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911229260.5A Active CN111086239B (en) 2019-12-04 2019-12-04 Forming method and forming die for composite material I-beam

Country Status (1)

Country Link
CN (1) CN111086239B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103496179B (en) * 2013-10-10 2015-11-18 航天海鹰(镇江)特种材料有限公司 The forming method of i shaped cross section composite material structural member
CN107399092B (en) * 2017-09-04 2019-09-13 江西洪都航空工业集团有限责任公司 A kind of preparation facilities and preparation method thereof of composite material I-shaped beam
CN110385861B (en) * 2019-07-20 2021-09-07 成都飞机工业（集团）有限责任公司 Method for forming composite material I-beam

Also Published As

Publication number Publication date
CN111086239A (en) 2020-05-01

Similar Documents

Publication Publication Date Title
CN107415098B (en) Sole mould for manufacturing soles
US20080261046A1 (en) Method For Producing Molded Bodies From Thermoplastic Material
KR900000677B1 (en) Manufacturing embossed articles of synthetic resin
US9434116B2 (en) Process for manufacturing composite material products, as well as products manufactured with this process
CN113119493B (en) Manufacturing method of multi-cavity structure, multi-cavity structure and forming die thereof
CN105473427A (en) Fiber-composite plastic component
US10647067B2 (en) Device for producing a component from fiber composite material
EP2067596B1 (en) A method and apparatus for manufacturing of an article including an empty space
CA2541266A1 (en) Process for compression moulding liquid resins with structural reinforcements
CN111086239B (en) Forming method and forming die for composite material I-beam
CN110774622B (en) Forming method and core mold for large-size large-length-diameter-ratio uniform-section composite material port type beam
CA2342644C (en) Molded resin laminate and method for producing the same
JP5775576B2 (en) Method for producing hollow body from thermoplastic resin and apparatus for carrying out the method
CN113370557A (en) Preparation method of carbon fiber square tube
CN207594159U (en) A kind of mold for manufacturing glass fibre three-way pipeline
JPH1170573A (en) Production of hollow structure of synthetic resin
CN112536943A (en) Integrated vacuum rubber sealing gasket and production mold and production method thereof
JPS60189431A (en) Manufacture of hollow product
CN218256272U (en) Multilayer rotational molding processing device
CN217047138U (en) Aileron structure liquid shaping frock
JP2000210968A (en) Skinned in-mold foamed molded object and production thereof
CN210082380U (en) Blow molding dust cover mold
CN211564413U (en) Mold for preparing double-faced shell mold of gearbox body
CN216423516U (en) Forming die for upper wall plate of T-shaped reinforcing rib composite material
US20230062340A1 (en) Method and tool for manufacturing a quadrangular shell made of composite material

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant