CN110588019A - Resin transfer molding process method and hammering vibration excitation device - Google Patents
Resin transfer molding process method and hammering vibration excitation device Download PDFInfo
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- CN110588019A CN110588019A CN201911027746.0A CN201911027746A CN110588019A CN 110588019 A CN110588019 A CN 110588019A CN 201911027746 A CN201911027746 A CN 201911027746A CN 110588019 A CN110588019 A CN 110588019A
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- hammering
- connecting block
- forming die
- excitation device
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- 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
- B29C70/36—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 impregnating by casting, e.g. vacuum casting
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of resin transfer molding, in particular to a resin transfer molding process method and a hammering excitation device used for the method. This hammering exciting arrangement includes support, drive division and hammering portion, and the drive division sets up at the support body, and hammering portion is connected with the drive division, and this hammering exciting arrangement can place on forming die through the support, and vertical direction reciprocating motion is followed to the drive division drive hammering portion, and hammering forming die treats hammering region. This hammering exciting arrangement places on forming die through the support, and convenient to use, drive division drive hammering portion reciprocating motion hammering forming die, applys the stress wave to forming die, promotes resin and fibrous infiltration, avoids the finished piece layering defect to appear, improves the yield of finished piece. According to the process method, stress waves are provided for the corresponding area of the forming die in the resin injection process through the hammering vibration excitation device, so that the infiltration of resin and fibers is promoted, the layering defect of a workpiece is avoided, and the yield of the workpiece is improved.
Description
Technical Field
The invention relates to the technical field of resin transfer molding, in particular to a resin transfer molding process method and a hammering excitation device for the process method.
Background
Resin Transfer Molding (RTM) technology has been used for more than half a century.
In recent years, the technology has been rapidly developed and is widely used in the fields of aircraft industry, automobile industry, ship industry and the like. The inserts, ribs, bulkheads, stiffeners and core material can all be molded into the designed locations as desired. In addition, since the weight content of the fiber ranges from 0% to 50%, both the primary structure and the secondary structure can be molded according to specific requirements. Despite these advantages, there are still some process problems to be solved for the RTM process to be used for molding high quality composite structures.
The conventional RTM process is to put a fiber preform into a closed mold cavity, inject a resin glue into the mold cavity under pressure to soak the fiber preform, and then cure and demold the molded article. However, in actual production, due to the complicated geometry of the product, for example, in the sharp corner area of the product, the resin glue solution cannot flow into the sharp corner area well (the main reason is that the flow resistance of the sharp corner area is large), so that the fiber and the resin solution cannot be well infiltrated, and the formed product has a delamination defect in the sharp corner area. And the delamination defect can cause the product to fail to manufacture, and cause loss in terms of human and property.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a hammering excitation device for a resin transfer molding process, which solves the problems that in the traditional process, the flow resistance of part of a workpiece is high, and the fiber and resin liquid cannot be well soaked.
The second purpose of the invention is to provide a resin transfer molding process method, which solves the problem that the prior process method is easy to cause the failure of product manufacture because the fiber and the resin liquid can not be well infiltrated.
(II) technical scheme
In order to achieve the first object, the invention provides a hammering vibration excitation device for a resin transfer molding process, in a first implementation mode, the hammering vibration excitation device comprises a support, a driving part and a hammering part, the driving part is arranged on the support, and the hammering part is connected with the driving part;
the support can be placed on forming die, and drive division drives hammering portion along vertical direction reciprocating motion, and hammering forming die treats hammering region.
With reference to the first aspect of the present invention, in a second aspect of the first aspect of the present invention, the driving unit includes:
the shell is connected with the bracket, and a through hole is formed in the lower end of the shell;
the driving module is arranged in the shell and comprises an upper connecting block, a lower connecting block and a plurality of piezoelectric ceramic plates which are coaxially and closely arranged between the upper connecting block and the lower connecting block, a plurality of tension springs are arranged between the upper connecting block and the lower connecting block, and two ends of each tension spring are respectively connected with the upper connecting block and the lower connecting block;
the upper connecting block is fixed on the shell, alternating voltage is applied to the upper end and the lower end of the piezoelectric ceramic piece, the lower connecting block can reciprocate in the axial direction of the piezoelectric ceramic piece under the combined action of the piezoelectric ceramic piece and the tension spring, and the hammering portion is connected with the lower connecting block.
With reference to the first aspect of the first aspect, in a third aspect of the first aspect of the present invention, the driving unit includes:
the shell is connected with the bracket, and a through hole is formed in the lower end of the shell;
the driving module is arranged in the shell and comprises an upper connecting block, a lower connecting block and a plurality of piezoelectric ceramic plates which are coaxially and closely arranged between the upper connecting block and the lower connecting block, the upper connecting block is fixedly connected with the shell, the hammering part is arranged outside the shell and is connected with the lower connecting block through a connecting rod, and a spring is arranged between the lower connecting block and the lower end of the shell;
alternating voltage is applied to the upper end and the lower end of the driving module, and the lower connecting block drives the hammering part to reciprocate in the axial direction of the piezoelectric ceramic piece under the combined action of the piezoelectric ceramic piece and the tension spring.
With reference to any one implementation manner of the first implementation manner to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect of the present invention, a magnet for connecting with a forming mold is disposed at a lower end of the bracket.
With reference to any one implementation manner of the first aspect to the third implementation manner of the first aspect, in a fifth implementation manner of the first aspect of the present invention, the bracket includes at least three legs, and a magnet for connecting with a forming mold is disposed at a lower end of each leg.
With reference to any one implementation manner of the first implementation manner to the fifth implementation manner of the first aspect, in a sixth implementation manner of the first aspect of the present invention, a threaded hole is formed in the bracket, one end of the bolt passes through the threaded hole and then is connected to the driving portion, and the distance between the driving portion and the forming mold can be adjusted by rotating the bolt.
With reference to any one implementation manner of the first implementation manner to the sixth implementation manner of the first aspect, in a seventh implementation manner of the first aspect of the present invention, the hammering portion is made of copper or a rubber material.
In order to achieve the second object, in a second aspect, the present invention provides a resin transfer molding process, which in a first implementation manner comprises the following steps:
s1, placing the fiber preform of the workpiece into a forming mold, and closing the mold;
s2, adopting resin required by the workpiece, slowly pressurizing the resin through a resin inlet of the forming die for injection, and maintaining the pressure until the injection is finished after the target injection pressure is reached;
s3, placing the hammering vibration excitation device according to any one of claims 1-7 in a to-be-hammered area of a forming die, starting the hammering vibration excitation device, observing whether the resin flowing out of a glue outlet of the forming die contains air bubbles or not until the resin flowing out of the glue outlet of the forming die does not contain air bubbles any more, and removing the hammering vibration excitation device;
s4, placing the forming die into an oven to be heated to cure the resin;
and S5, taking the molded part out of the molding die.
With reference to the first implementation manner of the second aspect, in a second implementation manner of the second aspect of the present invention, the target injection pressure value in step S2 is 0.6MPa, and the pressurization rate is 0.1MPa/1 min.
With reference to the first implementation manner or the second implementation manner of the second aspect, in a third implementation manner of the second aspect of the present invention, the preform is manufactured by using a 2.5D or 3D knitting method.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the invention provides a hammering vibration excitation device for a resin transfer molding process, which comprises a support, a driving part and a hammering part, wherein the driving part is arranged on a support body, the hammering part is connected with the driving part, the hammering vibration excitation device can be placed on a forming die through the support, the driving part drives the hammering part to reciprocate along the vertical direction, and an area to be hammered of the hammering forming die is hammered. This hammering exciting arrangement places on forming die through the support, and convenient to use, drive division drive hammering portion reciprocating motion hammering forming die, applys the stress wave to forming die, promotes resin and fibrous infiltration, avoids the finished piece layering defect to appear, improves the yield of finished piece.
According to the resin transfer molding process, stress waves are provided for the corresponding area of the molding die in the resin injection process through the hammering vibration excitation device, so that the infiltration of resin and fibers is promoted, the layering defect of a workpiece is avoided, and the yield of the workpiece is improved.
Drawings
The drawings of the present invention are provided for illustrative purposes only, and the proportion and the number of the components in the drawings do not necessarily correspond to those of an actual product.
Fig. 1 is a schematic front view of a hammering excitation device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a driving portion according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a hammering excitation device placed in a forming mold according to an embodiment of the present invention
FIG. 4 is a schematic structural diagram of a driving portion according to a second embodiment of the present invention;
fig. 5 is a schematic front view of a hammering excitation device according to a third embodiment of the present invention;
FIG. 6 is a schematic view of another angle of the hammer shock excitation device of FIG. 5;
fig. 7 is a schematic diagram of a hammer excitation device placed in a forming die according to a third embodiment of the present invention.
In the figure: 1: a support; 2: a drive section; 21: a housing; 22: an upper connecting block; 23: a lower connecting block; 24: piezoelectric ceramic plates; 25: a tension spring; 26: a spring; 3: a hammering portion; 4: a connecting rod; 5: a magnet; 6: a bolt; 7: and (5) forming a die.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
As shown in fig. 1, the hammering exciting device for the resin transfer molding process according to the embodiment of the present invention includes a support 1, a driving portion 2, and a hammering portion 3, where the driving portion 2 is fixed on the support 1, the hammering portion 3 is connected to the driving portion 2, the support 1 can be placed on a forming mold 7 (see fig. 3), and the driving portion 2 can drive the hammering portion 3 to reciprocate in a vertical direction to hammer a region to be hammered (a region with a large resin liquid flow resistance, such as a sharp corner region) of the forming mold 7.
As shown in fig. 1 and 3, in a specific embodiment, the bracket 1 includes an end surface and a plurality of legs, such as two, three or four legs, for supporting the end surface. The driving part 2 is fixed on the lower side of the end face.
In some preferred embodiments, there are three legs, each of which is L-shaped, increasing the contact area with the forming die 7, making the support more stable.
As shown in fig. 2, in a specific embodiment, the driving part 2 includes a housing 21 and a driving module, the driving module is installed in the housing 21, and the driving module includes an upper connecting block 22, a lower connecting block 23 and a plurality of piezoelectric ceramic plates 24, for example, the number of the piezoelectric ceramic plates 24 may be one, two, three, four, five, etc., and the specific number may be selected as needed, and is not limited herein. When the number of the piezoelectric ceramic pieces 24 is multiple, the piezoelectric ceramic pieces 24 are coaxially and closely arranged. A plurality of tension springs 25 are further disposed between the upper connecting block 22 and the lower connecting block 23, for example, in one embodiment, the number of tension springs 25 may be one, and preferably, the one tension spring 25 is sleeved outside the piezoelectric ceramic plate 24. In other embodiments, the number of the tension springs 25 may be two or more (for example, three, four, five, six, etc.), and the plurality of tension springs 25 are uniformly distributed around the circumference of the piezoelectric ceramic plate 24, so that the two connecting blocks are uniformly stressed.
The upper connecting block 22 is fixed on the casing 21, a via hole is formed in the lower end of the casing 21, the hammering portion 3 is located on the outer side of the lower end of the casing 21 and is connected with the lower connecting block 23 through the connecting rod 4 (one end of the connecting rod 4 penetrates through the lower end of the casing 21 to be connected with the lower connecting block 23 in the casing 21), alternating voltage is applied to two ends of the piezoelectric ceramic piece 24 or the piezoelectric ceramic piece group, the piezoelectric ceramic piece 24 pushes the lower connecting block 23 to move downwards, and the lower connecting block 23 is pulled back under the action of the tension spring 25, so that the lower connecting block 23 drives the hammering portion 3 to reciprocate along the axial direction of.
It should be noted that, in a specific embodiment, the hammering portion 3 may be directly connected to the lower connecting block 23, and a through hole at the lower end of the housing 21 may be provided for the hammering portion 3 to pass through. In other specific embodiments, as shown in fig. 2, the hammer portion 3 is connected to the lower connecting block 23 through the connecting rod 4, and the through hole can be penetrated by the connecting rod 4.
In some preferred embodiments, the hammer 3 is made of copper or rubber material, avoiding damage to the forming die 7.
In some preferred embodiments, the lower end of the bracket 1 is provided with a magnet 5 to facilitate the bracket to be fixed to the forming die 7. In one particular embodiment, as shown in fig. 1 and 3, the bottom of each leg is provided with a magnet 5.
When the hammering vibration excitation device is used, as shown in fig. 3, the support 1 of the hammering vibration excitation device is placed on the forming die 7, the hammering portion 3 is aligned to the area (a workpiece shape indicated by a dotted line in fig. 3) on the forming die corresponding to the part with large resin liquid flow resistance, such as the sharp corner and the corner of a workpiece, and the driving portion 2 drives the hammering portion 3 to reciprocate to hammer the forming die 7, so that the infiltration of resin and fibers is promoted, the layering defect of the workpiece is avoided, and the yield of the workpiece is improved.
It should be noted that, the piezoelectric ceramic as the driving scheme in the present embodiment can generally provide a hammering frequency of 1000-2000Hz, and can achieve a better effect. Of course this solution can also be adjusted to provide a hammering frequency below 1000 Hz.
Example two
As shown in fig. 4, the second embodiment is substantially the same as the first embodiment, the driving part 2 includes a housing 21 and a driving module, the driving module also includes an upper connecting block 22, a lower connecting block 23, and a plurality of piezoelectric ceramic plates 24 disposed between the upper connecting block 22 and the lower connecting block 23, and the same parts are not repeated, but different parts are: the tension spring 25 between the upper connecting block 22 and the lower connecting block 23 is eliminated, and a plurality of springs 26 are provided between the lower connecting block 24 and the lower end surface of the housing 21 to provide restoring force for the lower connecting block 23. In a specific embodiment, one spring 26 may be provided, and the spring 26 is sleeved outside the connecting rod 4, or a plurality of springs 26 (for example, three, four, five, six, etc.) may be provided, and the plurality of springs are uniformly distributed around the circumferential direction of the connecting rod 4.
EXAMPLE III
As shown in fig. 5 to 7, in order to adjust the hammering distance, in the present embodiment, a threaded hole is provided in the support 1, the driving portion 2 is adjustably fixed to the support 1 by the bolt 6, and the distance between the driving portion 2 and the forming die 7 can be adjusted by rotating the bolt 6, so that the hammering portion 3 has an appropriate hammering distance, and the versatility of the hammering exciting device is improved.
It should be noted that, in some specific embodiments, the driving portion 2 may also be another structure or device capable of driving the hammering portion 3 to perform a reciprocating motion, for example, a reciprocating swing motor, and a scheme using the reciprocating swing motor as a driving scheme can generally provide a hammering frequency below 1000Hz, and preferably, the frequency is selected from 100 Hz and 1000 Hz. The reciprocating swing motor is prior art and will not be described herein.
Example four
The resin transfer molding process method provided by the fourth embodiment includes the following steps:
s1, placing the fiber preform of the workpiece into a forming mold, and closing the mold;
s2, adopting resin required by the workpiece, slowly pressurizing the resin through a resin inlet of the forming die for injection, and maintaining the pressure until the injection is finished after the target injection pressure is reached;
s3, placing the hammering vibration excitation device according to any one of the first to third embodiments in the region to be hammered of the forming mold (see fig. 3 and 7), turning on the hammering vibration excitation device, observing whether the resin flowing out from the glue outlet of the forming mold contains bubbles, and removing the hammering vibration excitation device until the resin flowing out from the glue outlet of the forming mold does not contain bubbles any more;
s4, placing the forming die into an oven to be heated so as to cure the resin;
and S5, taking the molded part out of the molding die.
Preferably, the injection pressure target value in step S2 is 0.6MPa, and the pressurization rate is 0.1MPa/1 min.
Preferably, the preform in the process is manufactured by a 2.5D or 3D weaving method.
In the process method in the embodiment, stress waves are applied to parts with large resin flow resistance, such as the sharp corner of the workpiece, through the hammering vibration excitation device, so that the infiltration of fibers and resin is effectively promoted, the defect of the sharp corner area of the workpiece is further eliminated, and the yield of the workpiece is improved.
It should be noted that, for a product with a plurality of sharp corner regions, there are two hammering modes: the first is to hammer one area (mould area corresponding to the sharp corner) each time, and after the hammering is finished, whether the resin flowing out of the glue outlet still contains bubbles is observed, if the resin still contains bubbles, the resin is hammered again, and if the resin does not contain bubbles, the required hammering effect is achieved. The second method is to use a plurality of hammering exciting devices and simultaneously hammer a plurality of areas (mold areas corresponding to sharp corners) until the resin flowing out from the glue outlet does not contain air bubbles.
It should be further noted that the bubble is not included herein as a description of a judgment standard, and the specific standard may vary according to actual situations, for example, according to specific situations, the standard may also be that the content of the bubble is lower than a certain value, and these standards do not belong to the improvement of the present application, and are not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: each embodiment does not include only one independent technical solution, and in the case of no conflict between the solutions, the technical features mentioned in the respective embodiments can be combined in any way to form other embodiments which can be understood by those skilled in the art.
Furthermore, modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the scope of the present invention, and the essence of the corresponding technical solutions does not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A hammering excitation device for a resin transfer molding process, characterized in that: the hammer comprises a support, a driving part and a hammering part, wherein the driving part is arranged on the frame body, and the hammering part is connected with the driving part;
the support can be placed on forming die, drive division drives hammering portion is along vertical direction reciprocating motion, the hammering forming die treats hammering region.
2. The hammering excitation device according to claim 1, wherein the driving portion includes:
the shell is connected with the bracket, and a through hole is formed in the lower end of the shell;
the driving module is arranged in the shell and comprises an upper connecting block, a lower connecting block and a plurality of piezoelectric ceramic plates which are coaxially and closely arranged between the upper connecting block and the lower connecting block, a plurality of tension springs are arranged between the upper connecting block and the lower connecting block, and two ends of each tension spring are respectively connected with the upper connecting block and the lower connecting block;
go up the connecting block and fix the casing the alternating voltage is applyed at the upper and lower both ends of piezoceramics piece the piezoceramics piece with under the combined action of extension spring, the connecting block can be at the axial upward reciprocating motion of piezoceramics piece down, hammering portion with the connecting block is connected down.
3. The hammering excitation device according to claim 1, wherein the driving portion includes:
the shell is connected with the bracket, and a through hole is formed in the lower end of the shell;
the driving module is arranged in the shell and comprises an upper connecting block, a lower connecting block and a plurality of piezoelectric ceramic plates which are coaxially and closely arranged between the upper connecting block and the lower connecting block, the upper connecting block is fixedly connected with the shell, the hammering part is arranged outside the shell and is connected with the lower connecting block through a connecting rod, and a spring is arranged between the lower connecting block and the lower end of the shell;
alternating voltage is applied to the upper end and the lower end of the driving module, the piezoelectric ceramic piece and the tension spring are jointly acted, and the lower connecting block drives the hammering portion to reciprocate in the axial direction of the piezoelectric ceramic piece.
4. The hammering excitation device according to claim 1, wherein: and the lower end of the support is provided with a magnet used for being connected with the forming die.
5. The hammering excitation device according to claim 1, wherein: the support includes at least three stabilizer blade, every the lower extreme of stabilizer blade all be equipped with be used for with forming die connects's magnet.
6. The hammering excitation device according to any one of claims 1 to 5, wherein: the support is provided with a threaded hole, one end of a bolt penetrates through the threaded hole and then is connected with the driving part, and the bolt can be rotated to adjust the distance between the driving part and the forming die.
7. The hammering excitation device according to any one of claims 1 to 5, wherein: the hammering part is made of copper or rubber materials.
8. A resin transfer molding process method is characterized in that: the method comprises the following steps:
s1, placing the fiber preform of the workpiece into a forming mold, and closing the mold;
s2, adopting resin required by the workpiece, slowly pressurizing the resin through a resin inlet of the forming die for injection, and maintaining the pressure until the injection is finished after the target injection pressure is reached;
s3, placing the hammering vibration excitation device according to any one of claims 1 to 7 in a region to be hammered of the forming die, starting the hammering vibration excitation device, observing whether the resin flowing out of a glue outlet of the forming die contains air bubbles or not until the resin flowing out of the glue outlet of the forming die does not contain air bubbles any more, and removing the hammering vibration excitation device;
s4, placing the forming die into an oven to be heated so as to cure the resin;
and S5, taking the molded part out of the molding die.
9. The method of claim 8, wherein: in step S2, the injection pressure target value is 0.6MPa, and the pressurization rate is 0.1MPa/1 min.
10. The method according to claim 8 or 9, characterized in that: the preform is manufactured by a 2.5D or 3D weaving method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911027746.0A CN110588019A (en) | 2019-10-28 | 2019-10-28 | Resin transfer molding process method and hammering vibration excitation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911027746.0A CN110588019A (en) | 2019-10-28 | 2019-10-28 | Resin transfer molding process method and hammering vibration excitation device |
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| CN110588019A true CN110588019A (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112198020A (en) * | 2020-08-31 | 2021-01-08 | 中国石油大学(北京) | Rock sample preparation method and system for mineral element analysis |
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Application publication date: 20191220 |