CN114161638B - Device and method for reducing die pressing defects of corner areas of composite product - Google Patents
Device and method for reducing die pressing defects of corner areas of composite product Download PDFInfo
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- CN114161638B CN114161638B CN202111490570.XA CN202111490570A CN114161638B CN 114161638 B CN114161638 B CN 114161638B CN 202111490570 A CN202111490570 A CN 202111490570A CN 114161638 B CN114161638 B CN 114161638B
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- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000007547 defect Effects 0.000 title claims abstract description 20
- 238000007723 die pressing method Methods 0.000 title claims abstract description 11
- 239000000523 sample Substances 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims description 35
- 239000002994 raw material Substances 0.000 claims description 24
- 230000005284 excitation Effects 0.000 claims description 16
- 230000009191 jumping Effects 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000000748 compression moulding Methods 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000012778 molding material Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- -1 layering Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The application relates to the technical field of composite material products, in particular to a device and a method for reducing die pressing defects of corner areas of composite material products. The ultrasonic phased array probe comprises a controller (1), a supporting frame (11), an ultrasonic phased array probe (6) and an ultrasonic assembly, wherein the ultrasonic phased array probe (6) and the ultrasonic assembly are electrically connected with the controller (1), and the ultrasonic phased array probe comprises: a support (11) arranged on the side surface of the die; the ultrasonic phased array probe (6) is arranged on the supporting frame (11), and the detection end surface of the ultrasonic phased array probe (6) is in contact with the surface of the die; and the ultrasonic assembly is arranged on the supporting frame (11), and the working end face of the ultrasonic assembly is in contact with the surface of the die. Therefore, the existing compression molding device can be improved, and the ultrasonic vibration device which is simple in structure and convenient to install is provided, and can control ultrasonic vibration waves to focus on corner areas of composite material products, so that quality and efficiency of the composite material products are improved.
Description
Technical Field
The application relates to the technical field of composite material products, in particular to a device and a method for reducing die pressing defects of corner areas of composite material products.
Background
With the development of science and technology, the composite material has wider and wider application in the fields of aviation, aerospace, automobiles and the like due to the small specific gravity, high specific strength and high specific modulus. Wherein, the carbon fiber or glass fiber reinforced resin matrix composite material has the most widely applied and the greatest dosage. However, the structural form of the composite product has a great influence on the resin flow and fiber distribution in the composite product, and insufficient resin flow tends to occur in the corner regions of the composite product, so that defects such as voids, delamination, fat enrichment, uneven thickness and the like are formed.
In the process of pressurizing and solidifying the composite material raw material sheet, resin flow occurs, and the fibers and the resin in the die are subjected to ultrasonic vibration treatment, so that the sufficient resin flow and the uniform distribution of the fibers are facilitated, the occurrence of defects of a molded product can be effectively reduced, and the mechanical property and the surface quality of the molded product are improved. In addition, the method is beneficial to reducing the molding pressure and the residual stress of molded products and improving the molding efficiency.
In the application patent with publication number of CN105346101, a molding method and a molding device for fiber reinforced thermoplastic resin matrix composite laminate are disclosed, but the ultrasonic assembly used by the molding method is complex to install, the existing molding machine or mold is required to be structurally redesigned, the manufacturing cost is increased, and the technological process is more complex. The ultrasonic vibration molding device applies ultrasonic vibration to the whole mold, so that defects of corner areas of molded products of composite materials cannot be reduced effectively and pertinently. And defects tend to be easily generated in the corner regions.
Accordingly, there is a need for an apparatus and method for auxiliary composite compression molding that is easy to install on existing compression molding apparatus and that can specifically improve the corner area defects of composite articles.
Disclosure of Invention
The technical problems to be solved by the application are as follows: the device can control ultrasonic vibration waves to focus on the corner area of the composite product, thereby improving the quality and efficiency of the composite product.
The application adopts a technical scheme that: the utility model provides a reduce composite product turning area mould pressing defect device, it includes controller, support frame, ultrasonic phased array probe and ultrasonic assembly all are connected with the controller electricity, wherein:
the support frame is arranged on the side surface of the die;
the ultrasonic phased array probe is arranged on the supporting frame, and the detection end face of the ultrasonic phased array probe is in contact with the surface of the die;
and the ultrasonic assembly is arranged on the supporting frame, and the working end face of the ultrasonic assembly is in contact with the surface of the die.
Preferably, the ultrasonic assembly comprises an ultrasonic power supply, ultrasonic transducers and an ultrasonic amplitude transformer, wherein the ultrasonic transducers and the ultrasonic amplitude transformer are in one-to-one correspondence, the ultrasonic transducers are connected with the ultrasonic power supply, one end of the ultrasonic amplitude transformer is contacted with the end face of the ultrasonic transducer, and the other end of the ultrasonic amplitude transformer is contacted with the surface of the die.
Preferably, the single ultrasonic transducer and the single ultrasonic amplitude transformer form a unit, the units are uniformly distributed on a rectangular plane of a supporting frame, and the ultrasonic phased array probe is arranged in the middle of the rectangular plane.
Preferably, the ultrasonic transducer further comprises a sleeve, wherein the outer ring of the sleeve is in threaded connection with the support frame, and the inner ring of the sleeve is in threaded connection with the ultrasonic transducer.
Preferably, the frequency and amplitude parameters of all the ultrasonic transducers and ultrasonic horns are the same.
The other technical scheme adopted by the application is as follows: a method of reducing molding defects in corner regions of a composite article comprising the steps of:
s1, mounting a support frame with an ultrasonic phased array probe and an ultrasonic assembly on the side face of a die, and fixing the support frame firmly, wherein the ultrasonic assembly comprises an ultrasonic power supply, N ultrasonic transducers and N ultrasonic amplitude transformers, and the central position of an array formed by the N ultrasonic amplitude transformers after being mounted is obtained;
s2, controlling the ultrasonic phased array probe to work, detecting the inside of the die to obtain a corner area in the die and a center point P point position of the corner area, stopping the ultrasonic phased array probe to work, and jumping to the next step;
s3, setting the time sequence of the ultrasonic transducer according to the central position of the array obtained in the step S1 and the P point position obtained in the step S2,
each row of ultrasonic transducers work simultaneously, the delay time of the ultrasonic transducers of the adjacent rows works, and the delay time difference is as follows:
in the above formula, c is the transmission speed of ultrasonic waves in the die, d is the distance between two adjacent ultrasonic amplitude transformers, F is the distance between the P point and the center of an array formed by N ultrasonic amplitude transformers, and t n For the delay time of the excitation signal of the nth row of ultrasonic transducers, setting t 0 The theta is a constant, and the included angle between the connecting line of the P point and the center of the array and the normal line is formed;
s4, adding the die pressing raw material piece into a die;
s5, pressure maintaining and heat preservation are carried out;
s6, controlling the ultrasonic phased array probe to work, detecting a corner area in the die, and if the ultrasonic echo is detected to be in a set range, continuing detection; if the ultrasonic echo is detected to be lower than the set threshold value, judging that the composite material flows to start filling the corner area, feeding back a signal to the controller, and then jumping to the next step;
s7, the controller controls N ultrasonic transducers to perform pulse excitation according to the time sequence set in the step S3, then the ultrasonic phased array probe detects a corner area in the die, if an ultrasonic signal for completely curing a die pressing raw material sheet in the corner area is detected, the signal is fed back to the controller, the ultrasonic phased array probe stops working, and then the next step is skipped; if no ultrasonic signal for completely curing the molding raw material sheet in the corner area is detected, the ultrasonic phased array probe continues to detect;
s8, controlling N ultrasonic transducers to stop working;
s9, opening the die.
Preferably, in step S8, when the controller needs to delay for t' time, then the N ultrasonic transducers are controlled to stop working.
Preferably, after the ultrasonic transducer is operated for the time T in the step S7, the ultrasonic phased array probe starts to operate again to detect the corner area in the die, if an ultrasonic signal for completely curing the die pressing raw material sheet in the corner area is detected, the signal is fed back to the controller, the operation of the ultrasonic phased array probe is stopped, and then the step S8 is skipped; if no fully-cured ultrasonic signal is detected to occur on the molding raw material sheet in the corner area, the ultrasonic phased array probe is controlled to stop working firstly, and then after the T time, the ultrasonic phased array probe is controlled to continue to detect until the fully-cured ultrasonic signal is detected to occur on the molding raw material sheet in the corner area.
Preferably, when the ultrasonic transducer is operated in step S7, the ultrasonic phased array probe is also operated continuously until the ultrasonic signal of complete solidification of the molding material piece in the corner region is detected.
Preferably, the controller in step S7 may adjust the amplitude of each ultrasonic transducer excitation signal according to the size of the corner region of the molding cavity fed back by the ultrasonic phased array probe, so as to increase or decrease the applied ultrasonic vibration energy.
Compared with the prior art, the application has the following advantages: the device has novel structure and simple and convenient installation, and can be installed on the basis of the existing compression molding device. The auxiliary forming method based on the device can be applied to the compression molding process of the composite material, and the forming quality of the corner area of the compression molded product of the composite material is improved in a targeted manner. The method can effectively improve the resin fluidity and fiber distribution uniformity of the corner area of the composite material molded product, reduce the defects of pores, layering, fat enrichment and the like, and improve the production quality and efficiency.
Drawings
FIG. 1 is a schematic view of a device for reducing molding defects in corner regions of a composite article according to the present application.
Fig. 2 is a schematic diagram of the principles of the present application.
Wherein, 1, a controller; 2. an ultrasonic power supply; 3. an electrically stimulated signal line; 4. an ultrasonic transducer; 5. an ultrasonic horn; 6. an ultrasonic phased array probe; 7. a phased array instrument; 8. a sleeve; 9. a probe mount; 10. a fixing bolt; 11. a support frame; 12. molding the raw material sheet; 13. an upper die; 14. and (5) a lower die.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
Embodiment one:
as shown in fig. 1 and 2, the device for reducing the die pressing defect of the corner area of the composite product mainly comprises a controller 1, a supporting frame 11, an ultrasonic phased array probe 6 and an ultrasonic assembly, wherein:
the controller 1 is a CPLD (complex programmable logic device) or an FPGA (embedded programmable gate array), and can realize multichannel high-speed data acquisition of the ultrasonic phased array probe 6 and real-time control of excitation signals of a plurality of ultrasonic transducers 4;
the support frame 11 is a rigid support frame 11 and is of a rectangular structure, a plurality of sleeves 8 for installing the ultrasonic transducer 4 are uniformly arranged on the support frame, the sleeves 8 are in threaded connection with the support frame 11, so that the height of the sleeves 8 can be adjusted by rotating the sleeves 8, the middle part of the support frame is provided with an installation position for installing the ultrasonic phased array probe 6, and the support frame 11 is fixed on a die through a plurality of fixing bolts 10;
the ultrasonic phased array probe 6 is fixed with the supporting frame 11 through the probe fixing piece 9 and is connected with the controller 1 through the phased array instrument 7, and the detection end face of the probe is contacted with the surface of the die. Which enables dynamic focus scanning of the mold interior, when the phased array 7 detects a signal that the molding material piece 12 starts to flow to the corner region, the signal is fed back into the controller 1. The ultrasonic phased array probe 6 is a one-dimensional linear array probe, a two-dimensional rectangular array probe or an annular array probe.
The ultrasonic assembly comprises an ultrasonic power supply 2, an electric excitation signal line 3, ultrasonic transducers 4 and an ultrasonic amplitude transformer 5, wherein the ultrasonic transducers 4 are in one-to-one correspondence with the ultrasonic amplitude transformer 5, all the ultrasonic transducers 4 are respectively connected with the ultrasonic power supply through the electric excitation signal line 3, and then units formed by each ultrasonic transducer 4 and the ultrasonic amplitude transformer 5 are uniformly distributed in a sleeve 8 of a supporting frame 11 according to a certain interval. And ultrasonic transducer 4 is with sleeve 8 threaded connection, easy dismounting like this, and the adjustment is also more convenient, can realize letting ultrasonic amplitude transformer 5 keep suitable contact pressure with the mould surface, wherein:
the frequency emitted by the ultrasonic transducer 4 is 15 kHz-100 kHz. The ultrasonic horn 5 is in contact with the end face of the ultrasonic transducer 4, and can amplify the minute amplitude generated on the end face of the transducer to 10 to 300 micrometers. In this embodiment, the ultrasonic horn 55 continuously vibrates at an amplitude of 10 to 50 microns. The other end of the ultrasonic horn 5 is in contact with the surface of the upper die 13. And the frequency and amplitude parameters of the ultrasonic transducer 4 and the ultrasonic amplitude transformer 5 are the same.
And the number of the ultrasonic transducers 4 and the ultrasonic horn 5 is not limited, and they are uniformly and equally spaced apart on a rectangular plane except near the ultrasonic phased array probe 6.
The ultrasonic transducers 4 each have an independent electric excitation signal line 3 connected to the ultrasonic power supply 2. The controller 1 can control the ultrasonic power supply 2 to generate independent electric excitation signals, and can adjust the alternating frequency and the voltage amplitude of the electric excitation signals.
A method of reducing molding defects in corner regions of a composite article comprising the steps of:
s1, mounting a support frame 11 with an ultrasonic phased array probe 6 and an ultrasonic assembly on the side surface of a die, and fixing the support frame on the die firmly through a fixing bolt 10, wherein the ultrasonic assembly comprises an ultrasonic power supply 2, N ultrasonic transducers 4 and N ultrasonic amplitude transformers 5, and simultaneously obtaining the central position of an array formed by the N ultrasonic amplitude transformers 5 after being mounted;
s2, controlling the ultrasonic phased array probe 6 to work, detecting the inside of the die to obtain a corner area in the die and the position of a central point P point of the corner area, stopping the ultrasonic phased array probe 6 from working, and jumping to the next step; the ultrasonic phased array probe 6 can detect the position of the corner area inside the die, which is a conventional technology in the prior art and is not a technical scheme to be protected by the application, so that the ultrasonic phased array probe is not developed for detection;
s3, setting the time sequence of the ultrasonic transducer 4 according to the central position of the array obtained in the step S1 and the P point position obtained in the step S2,
each row of ultrasonic transducers work simultaneously, the delay time of the ultrasonic transducers of the adjacent rows works, and the delay time difference is as follows:
as shown in fig. 2, in the above formula, c is the sound velocity of ultrasonic waves in a medium, the mold material in this example is carbon structural steel, c=5900 m/s is taken, d is the distance between two adjacent ultrasonic horns, F is the distance between the point P and the center of an array formed by N ultrasonic horns, and t n For the delay time of the excitation signal of the nth row of ultrasonic transducers, setting t 0 To ensure t n A constant which is positive, wherein θ is an included angle between a connecting line of the P point and the center of the array and a normal line;
in this particular embodiment, the focal point to mold surface distance Fcos θ:10-200mm, included angle theta: 0-60 degrees, the number of ultrasonic transducers and ultrasonic amplitude transformers in each row on the support frame: 3-10, distance d between centers of two adjacent ultrasonic amplitude transformers: 30-80mm, a total of M arrays shown in FIG. 2 on the rigid support frame, M:3-20, distance L between each column: 30-80mm, die temperature: 100-300 ℃ and compression molding pressure: 5-10MPa, time delay t':10-30s.
S4, adding the molding raw material sheet 12 into a mold; spreading the molding raw material sheet 12 into a mold molding cavity of a mold, and spreading according to the shape of the cavity;
s5, pressure maintaining and heat preservation are carried out; the die is heated by heat conduction oil of a die temperature machine and maintained at a certain temperature T; the press descends, and when the upper die 13 moves to the molding raw material piece 12 and forms close contact with the lower die 14, the press pressurizes and maintains the molding pressure, and the molding raw material piece 12 flows under the action of temperature and pressure;
s6, controlling the ultrasonic phased array probe 6 to work, detecting a corner area in the die, and if the ultrasonic echo is detected to be in a set range, continuing detection; if the ultrasonic echo is detected to be lower than the set threshold value, judging that the composite material flows to start filling the corner area, feeding back a signal to the controller 1, and then jumping to the next step;
s7, the controller 1 controls N ultrasonic transducers 4 to perform pulse excitation according to the time sequence set in the step S3, meanwhile, the ultrasonic phased array probe 6 continuously detects corner areas in the die, if an ultrasonic signal for completely curing the molding raw material sheet 12 in the corner areas is detected, the signal is fed back to the controller 1, the operation of the ultrasonic phased array probe 6 is stopped, and then the next step is skipped; if no ultrasonic signal of complete solidification of the molding raw material sheet 12 in the corner area is detected, the ultrasonic phased array probe 6 continues to detect; the ultrasonic phased array probe 6 detects the corner area and generates echo, if the echo changes, the state of the corner area changes, such as filling begins, curing is finished, and the like, and how the specific echo changes is a conventional technical means in the prior art and is not protected by the application, so the ultrasonic phased array probe is not developed in detail in the application;
s8, controlling N ultrasonic transducers 4 to stop working;
s9, opening the die. After the set dwell time has been reached, the press begins to decompress and the upper die 13 is raised and the sheet of feedstock 12 is molded to form the composite article. And the ejector rod in the die ejects the molded product, and an operator takes out the composite material molded product.
Embodiment two:
compared with the first embodiment, in the present embodiment, the ultrasonic phased array probe 6 is not continuously detected in the step S7, but after the ultrasonic transducer 4 is operated for a period of time T, the ultrasonic phased array probe 6 is turned on to detect, if no completely cured ultrasonic signal is detected on the molded raw material sheet 12 in the corner area, the ultrasonic phased array probe 6 is stopped, and after the period of time T, the ultrasonic phased array probe 6 is controlled to detect again, the cycle is continued until the ultrasonic phased array probe 6 detects the completely cured ultrasonic signal on the molded raw material sheet 12 in the corner area, and the process goes to the step S8.
Embodiment III:
the difference from the first embodiment is that in step S8 in the third embodiment, when the controller 1 receives the ultrasonic signal transmitted by the ultrasonic phased array probe 6 and detected that the molded raw material piece 12 in the corner area is completely cured, it also needs to delay time t', and then controls the ultrasonic transducer 4 to stop working.
Embodiment four:
the difference from the first embodiment is that in step S7 in the fourth embodiment, the ultrasonic phased array probe 6 feeds back the detected size of the corner region of the molding cavity to the controller 1, and the controller adjusts the amplitude of each ultrasonic transducer excitation signal according to the size of the corner region, so as to increase or decrease the applied ultrasonic vibration energy. The magnitude of the corner region of the molding cavity is related to the amplitude of the excitation signal of the ultrasonic transducer, and the larger the corner region, the larger the amplitude is required, but the specific relationship between the two is not well protected, so the detailed description is omitted herein.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the application. Any and all equivalents and alternatives falling within the scope of the claims are intended to be embraced therein.
Claims (5)
1. A method for reducing die pressing defects in corner regions of a composite article, comprising: it comprises the following steps:
s1, mounting a support frame (11) with an ultrasonic phased array probe (6) and an ultrasonic assembly on the side surface of a die, wherein the ultrasonic assembly comprises an ultrasonic power supply (2), N ultrasonic transducers (4) and N ultrasonic amplitude transformers (5), and simultaneously obtaining the central position of an array formed by the N ultrasonic amplitude transformers (5) after being mounted;
s2, controlling the ultrasonic phased array probe (6) to work, detecting the inside of the die to obtain a corner area in the die and the position of a central point P point of the corner area, stopping the ultrasonic phased array probe (6) to work, and jumping to the next step;
s3, setting the time sequence of the ultrasonic transducer (4) according to the central position of the array obtained in the step S1 and the P point position obtained in the step S2,
each row of ultrasonic transducers (4) work simultaneously, the delay time of the ultrasonic transducers (4) of the adjacent row works, and the delay time difference is as follows:
in the above formula, N is the number of all ultrasonic amplitude transformers, c is the transmission speed of ultrasonic waves in a die, d is the distance between two adjacent ultrasonic amplitude transformers (5), F is the distance between a P point and the center of an array formed by the N ultrasonic amplitude transformers (5), and t n For the delay time of the excitation signal of the nth row of ultrasonic transducers (4), and setting t 0 The theta is a constant, and the included angle between the connecting line of the P point and the center of the array and the normal line is formed;
s4, adding the die-pressing raw material sheet (12) into a die;
s5, pressure maintaining and heat preservation are carried out;
s6, controlling the ultrasonic phased array probe (6) to work, detecting a corner area in the die, and if the ultrasonic echo is detected to be in a set range, continuing detection; if the ultrasonic echo is detected to be lower than the set threshold value, judging that the composite material flows to start filling the corner area, feeding back a signal to the controller (1), and then jumping to the next step;
s7, the controller (1) controls N ultrasonic transducers (4) to perform pulse excitation according to the time sequence set in the step S3, then the ultrasonic phased array probe (6) detects a corner area in the die, if an ultrasonic signal for completely solidifying a molding raw material sheet (12) in the corner area is detected, the signal is fed back to the controller (1), the ultrasonic phased array probe (6) is stopped, and then the next step is skipped; if no completely solidified ultrasonic signal is detected to occur to the molding raw material sheet (12) in the corner area, the ultrasonic phased array probe (6) continues to detect;
s8, controlling N ultrasonic transducers (4) to stop working;
s9, opening the die.
2. A method of reducing molding defects in corner regions of a composite article according to claim 1, wherein: in step S8, when the controller (1) needs to delay for t' time, then N ultrasonic transducers (4) are controlled to stop working.
3. A method of reducing molding defects in corner regions of a composite article according to claim 1, wherein: after the ultrasonic transducer (4) works for the time T in the step S7, the ultrasonic phased array probe (6) starts to work again to detect the corner area in the die, if the ultrasonic signal of the complete solidification of the die pressing raw material sheet (12) in the corner area is detected, the signal is fed back to the controller (1), the ultrasonic phased array probe (6) stops working, and then the step S8 is skipped; if no fully cured ultrasonic signal is detected to occur to the molding raw material sheet (12) in the corner area, the ultrasonic phased array probe (6) is controlled to stop working firstly, then the ultrasonic phased array probe (6) is controlled to continue to detect after the T time passes until the fully cured ultrasonic signal is detected to occur to the molding raw material sheet (12) in the corner area.
4. A method of reducing molding defects in corner regions of a composite article according to claim 1, wherein: when the ultrasonic transducer (4) is operated in the step S7, the ultrasonic phased array probe (6) also continuously operates until the ultrasonic signal of complete solidification of the molding raw material sheet (12) in the corner area is detected.
5. A method of reducing molding defects in corner regions of a composite article according to claim 1, wherein: the controller (1) in step S7 may adjust the amplitude of each ultrasonic transducer excitation signal according to the size of the corner region of the molding cavity fed back by the ultrasonic phased array probe (6), so as to increase or decrease the applied ultrasonic vibration energy.
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| CN103045294A (en) * | 2011-10-17 | 2013-04-17 | 中国石油天然气股份有限公司 | Electric treating desalting tank of compound ultrasonic wave demulsification and application of electric treating desalting tank |
| CN107283870A (en) * | 2017-08-01 | 2017-10-24 | 吉林大学 | Ultrasonic assistant compression molding fibrous composite device and forming method |
| CN108788159A (en) * | 2018-07-17 | 2018-11-13 | 太原理工大学 | A kind of ultrasonic wave auxiliary hot-pressed sintering furnace |
| CN111024825A (en) * | 2019-12-28 | 2020-04-17 | 北京无线电计量测试研究所 | Thin plate corner structure detection device and method and wedge block optimization method thereof |
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