CN111413415A - R-angle structure test block manufacturing mold and manufacturing and defect detection method - Google Patents
R-angle structure test block manufacturing mold and manufacturing and defect detection method Download PDFInfo
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- CN111413415A CN111413415A CN202010307072.6A CN202010307072A CN111413415A CN 111413415 A CN111413415 A CN 111413415A CN 202010307072 A CN202010307072 A CN 202010307072A CN 111413415 A CN111413415 A CN 111413415A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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Abstract
The invention discloses a manufacturing die of a test block with an R-shaped angle structure and a manufacturing and defect detecting method. The combined die for manufacturing the R-angle structure test block comprises a lower die, a middle die and an upper die, wherein the middle die is an arc plate for connecting two flat plates, the middle die is provided with a die cavity, the upper die and the lower die are connected to the middle die, and the upper die and the lower die are used for sealing the die cavity. The composite material and the preset artificial defect blocks are laid in the die cavity, and then the R-angle structure test block is manufactured by pressurizing and curing the upper die and the lower die. A wedge block matched with the R-angle structure test block is designed according to the curvature radius of the manufactured R-angle structure test block, the wedge block is connected with a phased array probe, the defects of the R-angle structure test block are detected through phased array ultrasound, the feasibility of the manufacturing method is verified, and the test block detection method can be used for phased array ultrasound detection teaching or training examinations. The manufacturing mold has the advantages of simple structure, low cost and short manufacturing period.
Description
Technical Field
The invention relates to the technical field of nondestructive testing, in particular to a die for manufacturing a test block with an R-angle structure and a manufacturing and defect detecting method.
Background
The resin-based fiber reinforced composite material (composite material for short) shows great superiority in structural design, process manufacturing, mechanical property, use environment and other aspects, and is widely applied to aircraft manufacturing. A plurality of load-bearing composite material parts such as beams, ribs, stringers and the like in an aircraft have a large number of R-angle regions, and the laying and forming quality of the R-angle regions has important significance on the mechanical property and the internal quality of the composite material parts.
Compared with a flat plate structure, the product with the R-angle structure is more likely to cause defects such as pores, delamination, debonding and the like due to uneven resin flow or insufficient curing and the like in the curing and forming process. Therefore, the quality control of the R-angle structure of the composite material is very important. In recent years, with the rapid development of the market and production globalization, the aviation manufacturing in China has become an indispensable part of the industry chain of the aviation industry in the world. In the quality detection acceptance standard of Europe and America aviation manufacturing strong countries, strict requirements are made on the R-angle structure. In order to detect the R-angle structure composite material part, firstly, a reference block for detecting the R-angle structure is designed and manufactured, so that the detection sensitivity is adjusted, and the defect burial depth and size are judged. Because of the high quality requirements of composite parts for aircraft components, autoclave fabrication is common, expensive equipment and complex processes.
Disclosure of Invention
The invention aims to provide a simple and practical manufacturing die of an R-angle structure test block and a method for manufacturing the R-angle structure test block by using the manufacturing die, wherein the manufacturing method is simple; the ultrasonic detection method for the defects of the test block with the R-angle structure is further provided, the feasibility of the manufacturing method is verified, and the ultrasonic detection method can be used for phased array ultrasonic detection teaching or training examinations.
The invention is realized by the following technical scheme:
the utility model provides a preparation mould of R angle structure test block, includes well mould and last mould, be provided with on the well mould and form the die cavity of R angle structure, it connects to go up the mould on the well mould, it is used for sealing to go up the mould the die cavity, the activity is provided with the positioning scale on the well mould, the positioning scale is used for demarcating the position of placing artifical defect piece in the die cavity.
Further, still be equipped with well mould fastening screw on the well mould, be equipped with mould fastening screw on the last mould equally, fastening bolt passes well mould fastening screw with go up the mould will well mould with last mould fixed connection makes through fastening bolt well with it is more firm to go up the mould connection, also makes things convenient for well mould and last mould dismouting simultaneously.
Further, the middle die comprises a lower die arranged below the middle die, the middle die comprises two flat plates and an arc plate, the two flat plates are in transition through the arc plate, the die cavity penetrates through the middle die, the lower die and the upper die are respectively positioned at two sides of the middle die and used for sealing the die cavity, the lower die is provided with a lower die fastening screw hole, the middle die is provided with a middle die fastening screw hole, the upper die is provided with an upper die fastening screw hole, a fastening bolt penetrates through the lower die fastening screw hole, the middle die fastening screw hole and the upper die fastening screw hole to fixedly connect the lower die, the middle die and the upper die, the die cavity is designed into a structure penetrating through the middle die, then the lower die is designed into a structure which is the same as the middle die, then the die cavity is sealed through the upper die and the lower die, and the purpose of, the R angle structure test block in the die cavity can be smoothly demolded and taken out, and only the fastening bolts connected in the fastening holes of the lower die and the middle die and in the fastening screw holes of the upper die are required to be screwed out, and then the lower die, the middle die and the upper die are separated, so that the R angle structure test block is separated from the upper die and the lower die, and the R angle test block is more conveniently taken out.
Furthermore, an installation seat is arranged on the outer side of the arc plate on the middle die, one end of the positioning scale is rotatably connected on the installation seat, the other end of the positioning scale is provided with a limiting block, the positioning scale is also sleeved with an alignment block in a sliding manner, the mounting seat is designed to facilitate the rotating mounting of the positioning scale, the laying position of the artificial defect block can be calibrated through the positioning scale, so that the laying position is more accurate, the aim of laying artificial defects accurately can be achieved by slidably sleeving the alignment block on the scale and calibrating the laying position of the specified artificial defect block by using the alignment block, the one end setting of positioning scale the stopper is mainly in order to prevent the alignment piece drops at the slip in-process positioning scale, mount pad pass through bolted connection in the outside of well mould circular arc board, after artificial defect laid and accomplished, can demolish the mount pad, take off positioning scale.
Furthermore, a middle die ejection screw hole is also formed in the middle die, an upper die ejection screw hole corresponding to the middle die ejection screw hole is also formed in the upper die, the middle die ejection screw hole and the upper die ejection screw hole are used for connecting an ejection bolt, and one end of the ejection bolt abuts against the lower die; the upper die is of the same structure as the middle die, a reinforcing plate is arranged on one surface of the upper die deviating from the middle die, the reinforcing plate is arranged at the arc transition position of the upper die, and the middle die ejection screw hole and the upper die ejection screw hole for connecting the ejection screw rod are designed on the middle die and the upper die due to overlarge wrapping force on the die after the R angle structure test block is cured and molded, so that the middle die and the upper die can be separated from the lower die more easily through connecting the ejection screw rod in the middle die ejection screw hole and the upper die ejection screw hole, the R angle structure test block is taken out conveniently, in addition, when the thickness of the middle die is designed, the gap between the edges of the middle die and the upper die after die assembly is not less than 3mm, so that a space for inserting and prying tools can be reserved between the middle die and the upper die, thereby ensuring that the middle die and the upper die can be smoothly separated; will go up the mould design for with the structure that well mould is the same is for better will the die cavity seals go up the mould on deviate from well mould with be equipped with the reinforcing plate in the one side that the mould is connected, then set up the reinforcing plate the circular arc transition department of last mould, the purpose of this design is to increase the structural strength of mould, because the reinforcing plate makes the structural strength of going up the mould higher to the supporting role of last mould, in addition a reinforcing plate structure is connected respectively on two blocks of flat boards of last mould for the both ends of reinforcing plate, and the reinforcing plate is not contacted with the circular arc transition department of last mould, and this structural reinforcement plate can increase the structural strength of last mould equally.
Further, the angle of the R-angle structure is 30-150 degrees, and the curvature radius of the R-angle structure is 4 mm.
A manufacturing method of an R-angle structure test block comprises the following steps:
(1) cleaning the manufacturing mold of any one of claims 1-6 to ensure the manufacturing mold is smooth and clean;
(2) laying fiber cloth in a die cavity layer by layer and coating resin materials, laying a plurality of artificial defect blocks in a corresponding fiber cloth layer according to the pre-buried depth of a plurality of artificial defect blocks designed in advance when laying the fiber cloth, accurately calibrating the positions of the artificial defect blocks by a positioning scale, laying a plurality of artificial defect blocks at the arc transition part in an R-angle structure test block, taking down the positioning scale after laying, closing the upper die, fixing the upper die and the middle die, and then curing;
(3) and after the solidification is finished, separating the middle die from the upper die, taking out the R-angle structure test block, and cutting off the allowance around the R-angle structure test block.
Further, step (2) is to uniformly coat a layer of release agent in the die cavity before laying the fiber cloth, the artificial defect block comprises a rectangular membrane embedded in the R-angle structure test block and another metal sheet placed at the end part of the R-angle structure test block, the metal sheet needs to be taken out from the rectangular membrane after demoulding the R-angle structure test block, a cavity is formed in the R-angle structure test block after the metal sheet is taken out, the curing time is 20-24 hours, the release agent is coated to enable the composite material R-angle structure test block to be separated from the die cavity more easily after curing and forming, the artificial defect block is designed to simulate natural layering defects possibly generated in actual production, and the detection sensitivity is adjusted by detecting a preset artificial defect block, so that whether defects exist in the detection of an actual R-angle structure can be detected more accurately, the detection efficiency is improved.
Further, the rectangle diaphragm is double-deck polytetrafluoroethylene diaphragm, the even adhesive that scribbles in double-deck polytetrafluoroethylene diaphragm surface, double-deck polytetrafluoroethylene diaphragm size is 6mm × 20mm, the thickness of double-deck polytetrafluoroethylene diaphragm is 0.06mm, the sheetmetal is the brass foil, the size of sheetmetal is 6mm × 40mm, the thickness of sheetmetal is 0.2-0.25mm, the sheetmetal makes its half place when laying on the fibre cloth, half exposes outside, earlier scribble one deck release agent on its surface when the sheetmetal is laid, polytetrafluoroethylene diaphragm and copper foil are laid in the design and are based on the poor reason of the ultrasonic wave penetrability of polytetrafluoroethylene diaphragm and copper foil, can be more accurate simulate out the defect effect, scribble the adhesive on double-deck polytetrafluoroethylene diaphragm surface evenly for the position of better fixed artificial defect, place copper foil half on the fibre cloth, half expose outside for convenient taking out copper foil from the place after the shaping of R angle structure, take out the artifical defect of formation in the R angle structure test piece after taking out, the artifical defect is taken out in the surface of copper foil, thereby the artifical foil is taken out the artificial defect in the production of the same production of the artificial angle structure, thereby the production of production defect production in the artificial angle.
A defect detection method of an R-angle structure test block comprises the following steps:
(1) designing a wedge block matched with the arc transition part of the R-angle structure test block according to the curvature radius of the R-angle structure test block manufactured by the manufacturing method of any one of claims 7 to 9;
(2) placing the R-angle structure test block on a workbench, enabling the bottom of the arc transition position of the R-angle structure test block to be in contact with the workbench and supported at the outer sides of the bottoms of the two flat plates of the R-angle structure test block, enabling the R-angle structure test block to be in a stable state, and then adding water at the arc transition position;
(3) measuring the actual depth of an artificial defect formed by a preset metal sheet by using a caliper, placing the wedge block at the arc transition position of the R-angle structure test block and connecting the wedge block with a phased array probe, controlling a plurality of array elements in the phased array probe to transmit ultrasonic sound beams by using a phased array ultrasonic flaw detector, wherein the array elements are uniformly distributed, so that the ultrasonic sound beams can cover the arc transition position below the phased array probe; then calculating to obtain the propagation speed of the ultrasonic wave according to the actual depth of the defect and the propagation time of the ultrasonic wave, and then inputting the propagation speed into the phased array flaw detector;
(4) and then, taking the propagation speed as a reference, continuously placing the wedge block at the arc transition position of the test block with the R-angle structure, controlling a plurality of array elements in the phased array probe to emit ultrasonic beams through the phased array ultrasonic flaw detector, and then stably moving the wedge block and the phased array probe along the extension direction of the R angle to obtain the ultrasonic detection map.
The wedge block matched with the arc transition part of the R-angle structure test block is designed in the step (1) so as to prevent ultrasonic energy loss in the detection process and improve the detection effect, and the material of the wedge block is preferably organic glass.
Step (2) the R angle structure test block is rotated to the position where the flat plates on the two sides of the R angle structure test block are symmetrical about the vertical plane where the flat plates are located with the contact line of the R angle structure test block and the workbench (namely, the included angle between the two sides of the R angle structure test block and the workbench is the same), then water is added at the arc transition position, because the detection of the composite material R angle structure test block usually uses water as a coupling agent, in order to prevent water from flowing out of the arc transition position along the flat plates in the composite material R angle structure test block to cause no coupling, the composite material R angle structure test block is rotated to the position where the opening faces upwards (namely, the flat plates on the two sides of the R angle structure test block are symmetrical about the vertical plane where the flat plates are located with the contact line of the workbench), so that all water added at the arc position of the R angle structure test block in the test process can be concentrated at the arc transition position of the R angle structure test block, the detection can be better performed, and then the outer sides of, the R angle structure test block made of the composite material is in a stable state, and the stability and the non-shaking of the R angle structure test block in the detection process are guaranteed.
And (4) according to the ultrasonic propagation speed calculated in the step (3), obtaining the positions of other defects through the propagation time measured by the phased array ultrasonic flaw detector, and comparing the measured defect positions with the preset defect positions so as to adjust the sensitivity of the detection equipment.
The invention has the beneficial effects that:
(1) in the manufacturing process of the R-angle structure test block, the artificial defect block often has certain position offset, the manufacturing mould for designing the invention adopts a symmetrical pressurizing mode, the position offset of the artificial defect block can be effectively prevented in the manufacturing process of the R-angle structure test block, the mounting seat for connecting the positioning scale is designed on the middle mould, and the artificial defect block can be laid more accurately through the positioning scale; the manufacturing mold has a simple structure, the manufacturing material can be steel or aluminum section bars, the manufacturing cost is low, and the manufacturing period is short;
(2) laying a metal sheet at the end part of the arc transition part of the R-angle structure test block, drawing out the metal sheet after the R-angle structure test block is formed, and forming a cavity in the composite material R-angle structure test block after the metal sheet is drawn out, so that natural debonding defects generated in the actual production process can be better simulated;
(3) the detection method can also be used for phased array ultrasonic detection teaching or training examinations.
Drawings
FIG. 1 is a schematic structural view of a lower mold in a mold according to the present invention;
FIG. 2 is a schematic structural diagram of a middle mold in a mold according to the present invention;
FIG. 3 is a schematic structural diagram of an upper mold in the mold of the present invention;
FIG. 4 is a schematic diagram of defect laying of the R-angle structural test block of the present invention;
FIG. 5 is a schematic view of the wedge of the present invention;
FIG. 6 is a schematic view of the ultrasonic testing principle of the present invention;
FIG. 7 is an ultrasonic detection map of a defect with a buried depth of 1.5 mm;
FIG. 8 is an ultrasonic detection map of a defect with a burial depth of 4.5 mm;
FIG. 9 is an ultrasonic detection map of a defect with a burial depth of 6.5 mm.
In the figure: 1 lower die, 2 middle die, 3 upper die, 4R angle structure test block, 5 phased probe, 6 wedge, 7 ultrasonic sound beam, 11 lower die fastening screw holes, 21 flat plate, 22 arc plate, 23 middle die groove, 24 middle die fastening screw holes, 25 middle die ejection screw holes, 26 positioning scale, 27 mounting seat, 31 upper die fastening screw holes, 32 upper die ejection screw holes, 33 ejection bolts, 34 reinforcing plate, 261 limiting block, 262 aligning block.
Detailed Description
The invention is illustrated in detail below with reference to specific examples:
examples
As shown in fig. 1-3, a mold for manufacturing a composite material R-angle structure test block comprises a lower mold 1, a middle mold 2 and an upper mold 3, wherein the middle mold 2 comprises two flat plates 21 and an arc plate 22, and the two flat plates 21 are transited by the arc plate 22.
As shown in fig. 2, a mold cavity 23 is provided on the middle mold 2, the mold cavity 23 penetrates through the middle mold 2, and the lower mold 1 is provided below the middle mold 2. As shown in fig. 1, the lower mold 1 has the same shape as the middle mold 2, and the lower mold 1 is used for closing the mold cavity 23; the top of well mould 2 is equipped with mould 3, goes up mould 3 and also is the shape the same with well mould 2, goes up mould 3 and is used for sealing die cavity 23 equally, goes up mould 3 and 1 cooperation of lower mould and seals die cavity 23 completely, deviates from in last mould 3 to be equipped with reinforcing plate 34 on the one side that last mould 3 and well mould 2 are connected, and reinforcing plate 34 sets up the circular arc transition department at last mould 3, and two of reinforcing plate 34 are connected respectively on going up the mould flat board in last mould 3. As shown in fig. 3, the reinforcing plate 34 is disposed on the upper mold 3 to support the upper mold 3 well, so as to increase the structural strength of the upper mold 3.
The lower die 1 is provided with a lower die fastening screw hole 11, the middle die 2 is provided with a middle die fastening screw hole 24, the upper die 3 is provided with an upper die fastening screw hole 31, wherein the sizes of the lower die 1 and the middle die 2 are larger than that of the upper die 1, the lower die fastening screw hole 11 and the middle die fastening screw hole 24 positioned on the outer side of the upper die 3 are connected with fastening bolts to fixedly connect the lower die 1 and the middle die 2 together, one surface of the die cavity 23 is sealed, the upper die fastening screw hole 31, the middle die fastening screw hole 24 and the lower die fastening screw hole 11 are screwed with the fastening bolts to fixedly connect the upper die 3 to the middle die 2 and the lower die 1, and.
The middle die 2 is also provided with a middle die ejecting screw hole 25, the upper die 3 is also provided with an upper die ejecting screw hole 32 corresponding to the middle die ejecting screw hole 25, the middle die ejecting screw hole 25 and the upper die ejecting screw hole 32 are used for connecting an ejecting bolt 33, one end of the ejecting bolt 33 is abutted against the lower die 1, the middle die 2 and the upper die 3 can be ejected out of the lower die 1 together by screwing the connecting bolt 33 into the middle die ejecting screw hole 25 and the upper die ejecting screw hole 32, so that the middle die 2 and the upper die 3 are separated from the lower die 1 together (before separation, all fastening bolts need to be removed).
As shown in fig. 2, well mould 2 is provided with mount pad 27 in the outside of circular arc board 22, mount pad 27 passes through bolted connection on circular arc board 22, the one end of positioning scale 26 is rotated and is connected on mount pad 27, the other end is equipped with stopper 261, it is equipped with alignment piece 262 to still slide the cover on the positioning scale 26, alignment piece 262 is used for laying artificial defect piece time mark position, reach the purpose of accurate laying, stopper 261 is used for preventing to aim at piece 262 and breaks away from positioning scale 26 at the slip in-process, after artificial defect has all laid, can demolish mount pad 27, thereby take off positioning scale 26.
In addition, the gap between the edges of the middle die 2 and the upper die 3 is not less than 3mm after die assembly is considered, so that a space for inserting a prying tool is reserved between the middle die 2 and the upper die 3, the middle die 2 can be smoothly separated from the upper die 3, the composite material R angle structure test block 4 can be smoothly taken out after the lower die 1 and the upper die 3 are separated from the middle die 2, and the opening angle and the curvature radius of the composite material R angle structure test block 4 manufactured by manufacturing the die are 30-150 degrees and 4mm respectively.
The specific method for preparing the composite material R-angle structure test block by using the manufacturing mold comprises the following steps:
a manufacturing method of an R-angle structure test block comprises the following steps:
(1) cleaning the lower die 1, the middle die 2 and the upper die 3 to ensure that the manufacturing die is smooth and clean, and then connecting fastening bolts in fastening screw holes of the middle die 2 and the lower die 1 to fixedly connect the lower die 1 and the middle die 2;
(2) uniformly smearing a layer of release agent in a die cavity 23, then starting to lay fiber cloth layer by layer and brush resin materials, when laying the fiber cloth, according to the pre-buried depth of 3 pre-designed artificial defect blocks, then laying 3 artificial defect blocks in the corresponding fiber cloth layer, accurately calibrating the positions of the artificial defect blocks through a positioning scale 26 (the pre-buried depth of the 3 artificial defect blocks is 1.5mm, 4.5mm and 6.5mm respectively, measuring the distance between the artificial defect blocks through the positioning scale 26 to be 25mm, then sliding an alignment block 262 sleeved on the scale 26 to slide to a specified position through an alignment block 262 which is sleeved with a sliding plate, then starting to lay the corresponding artificial defect block, the artificial defect block with the pre-buried depth of 1.5mm is a rectangular film sheet of double-layer polytetrafluoroethylene with the length of 20mm, the width of 6mm and the thickness of 0.06mm, firstly uniformly smearing an adhesive when laying the rectangular film of double-layer polytetrafluoroethylene film, so as to facilitate the film to be laid on the film of the rectangular film, when laying the rectangular film of double-layer of the film, the film is fastened by a rectangular film, the film is fastened by a spanner with the width of 20mm, the width of the film, the film is fastened by a transition angle, the width of the film, the film is 20.06, the width of the film, the film is fastened by a transition angle, the width of the film, the film is fastened by a transition angle, the width of the film is 20mm, the width of the width;
(3) and when the demolding strength is reached after the solidification is finished, removing all fastening bolts, screwing an ejection screw 33 into an upper mold ejection screw hole 32 and a middle mold ejection screw hole 25, ejecting the middle mold 2 and the upper mold 3 together to separate the lower mold 1 through the ejection screw 33, after the middle mold 2 and the upper mold 3 separate from the lower mold 1 together, screwing out the ejection screw 33, inserting a prying tool into a gap between the edges of the middle mold 2 and the upper mold 3 to separate the middle mold 2 from the upper mold 3, knocking to take out the R angle structure test block 4, and finally cutting the peripheral allowance of the R angle structure test block 4 by using a numerical control milling machine to obtain the composite material R angle structure test block.
The ultrasonic defect detection is carried out by using the prepared composite material R-angle structure test block, and the specific method comprises the following steps:
a defect detection method of an R-angle structure test block comprises the following steps:
(1) according to the curvature radius of the composite material R angle structure test block 4, an organic glass wedge block 6 matched with the arc transition position in the composite material R angle structure test block 4 is designed, as shown in figure 5, then a layer of engine oil is evenly coated on the connection surface of the phased array probe 5 and the organic glass wedge block 6 respectively, the engine oil is used for removing air between the connection surface of the phased array probe 5 and the organic glass wedge block 6, ultrasonic energy loss is prevented, and then the organic glass wedge block 6 is connected with the phased array probe 5;
(2) placing the composite material R angle structure test block 4 on a workbench, enabling the bottom of the arc transition position in the composite material R angle structure test block 4 to be in contact with the workbench, then rotating the composite material R angle structure test block 4 to the flat plates on the two sides of the R angle structure test block, and enabling the flat plates to be symmetrical about the vertical plane where the flat plates are in contact with the workbench (namely the included angles between the two sides of the R angle structure test block and the workbench are the same), then supporting the outer sides of the bottoms of the two flat plates of the composite material R angle structure test block 4, enabling the composite material R angle structure test block 4 to be in a stable state, and then adding a small amount of water at the arc transition position of the R angle structure test block to serve as a coupling agent;
(3) measuring the actual depth of an artificial defect formed by a preset metal sheet by using a caliper, then placing an organic glass wedge block 6 at the arc transition position of an R-angle structure test block, as shown in fig. 6, and then controlling 16 or 32 array elements in a phased array probe 5 to transmit ultrasonic sound beams 7 through a phased array flaw detector, wherein the 16 or 32 array elements are uniformly distributed on the phased array probe 5, so that the ultrasonic sound beams 7 can cover the arc transition position right below the whole phased array probe 5; then calculating to obtain the propagation speed of the ultrasonic wave according to the actual depth of the defect and the propagation time of the ultrasonic wave, and then inputting the propagation speed into the phased array flaw detector;
(4) and then, taking the propagation speed as a reference, continuously placing the organic glass wedge block 6 at the arc transition position of the R-angle structure test block, controlling 16 or 32 array elements in the phased array probe 5 to emit an ultrasonic sound beam 7 through the phased array flaw detector, and then stably moving the organic glass wedge block 6 and the phased array probe 5 along the extension direction of the R angle to obtain the ultrasonic detection map shown in the figures 7-9.
The above-mentioned preferred embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention. Obvious variations or modifications of the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a preparation mould of R angle structure test block, its characterized in that, includes well mould (2) and last mould (3), be provided with on well mould (2) and form die cavity (23) of R angle structure, it connects to go up mould (3) on well mould (2), it is used for sealing to go up mould (3) die cavity (23), the activity is provided with positioning scale (26) on well mould (2), positioning scale (26) are used for demarcating place the position of artifical defect piece in die cavity (23).
2. The mold for manufacturing the R-angle structure test block according to claim 1, wherein the middle mold (2) is further provided with a middle mold fastening screw hole (24), the upper mold (3) is also provided with an upper mold fastening screw hole (31), and a fastening bolt passes through the middle mold fastening screw hole (24) and the upper mold to fixedly connect the middle mold (2) and the upper mold (3).
3. The manufacturing mold of the R-angle structure test block as claimed in claim 1, further comprising a lower mold (1) arranged below the middle mold (2), wherein the middle mold (2) comprises two flat plates (21) and an arc plate (22), the two flat plates (21) are in transition with the arc plate (22), the mold cavity (23) penetrates through the middle mold (2), the lower mold (1) and the upper mold (3) are respectively located at two sides of the middle mold (2) and used for sealing the mold cavity (23), the lower mold (1) is provided with a lower mold fastening screw hole (11), the middle mold (2) is provided with a middle mold fastening screw hole (24), the upper mold (3) is provided with an upper mold fastening screw hole (31), and a fastening bolt penetrates through the lower mold fastening screw hole (11), the middle mold fastening screw hole (24) and the upper mold fastening screw hole (31) to fasten the lower mold (1), The middle die (2) is fixedly connected with the upper die (3).
4. The mold for manufacturing the R-angle structure test block according to claim 1, 2 or 3, wherein an installation seat (27) is arranged on the outer side of the arc plate (22) on the middle mold (2), one end of a positioning scale (26) is rotatably connected onto the installation seat (27), a limiting block (261) is arranged at the other end of the positioning scale (26), and an alignment block (262) is further slidably sleeved on the positioning scale (26).
5. The mold for manufacturing the R-angle structure test block according to claim 3, wherein the middle mold (2) is further provided with a middle mold ejection screw hole (25), the upper mold (3) is also provided with an upper mold ejection screw hole (32) corresponding to the middle mold ejection screw hole (25), the middle mold ejection screw hole (25) and the upper mold ejection screw hole (32) are used for connecting an ejection bolt (33), and one end of the ejection bolt (33) abuts against the lower mold (1); go up mould (3) be with well mould (2) the same structure, it is deviating from to go up mould (3) be equipped with reinforcing plate (34) on well mould (2) one side, reinforcing plate (34) set up the circular arc transition department of going up mould (3).
6. The mold for manufacturing the R-angle structure test block according to claim 1, wherein the angle of the R-angle structure is 30-150 degrees, and the radius of curvature of the R-angle structure is 4 mm.
7. A manufacturing method of an R-angle structure test block is characterized by comprising the following steps:
(1) cleaning the production mold of any one of claims 1-6 to ensure the production mold is clean and clean;
(2) then laying fiber cloth in the die cavity (23) layer by layer and coating resin materials, when laying the fiber cloth, laying a plurality of artificial defect blocks in the corresponding fiber cloth layer according to the pre-buried depth of the artificial defect blocks which are designed in advance, accurately calibrating the positions of the artificial defect blocks through a positioning scale (26), laying a plurality of artificial defect blocks at the arc transition position in the R-angle structure test block, taking down the positioning scale after laying, closing the upper die (3), fixing the upper die (3) and the middle die (2), and then curing;
(3) after solidification is finished, the middle die (2) and the upper die (3) are separated, the R angle structure test block (4) is taken out, and then the allowance around the R angle structure test block (4) is cut off.
8. The manufacturing method of the R-angle structure test block is characterized in that in the step (2), before the fiber cloth is laid, a layer of release agent is uniformly coated in the die cavity (23), the artificial defect block comprises a rectangular membrane buried in the R-angle structure test block (4) and another metal sheet placed at the end part of the R-angle structure test block (4), the metal sheet needs to be taken out of the R-angle structure test block (4) after the R-angle structure test block is demoulded, a cavity is formed in the R-angle structure test block (4) after the metal sheet is taken out, and the curing time is 20-24 hours.
9. The manufacturing method of the R-angle structure test block is characterized in that the rectangular membrane is a double-layer polytetrafluoroethylene membrane, an adhesive is uniformly coated on the surface of the double-layer polytetrafluoroethylene membrane, the size of the double-layer polytetrafluoroethylene membrane is 6mm × 20mm, the thickness of the double-layer polytetrafluoroethylene membrane is 0.06mm, the metal sheet is a brass foil sheet, the size of the metal sheet is 6mm × 40mm, the thickness of the metal sheet is 0.2-0.25mm, one half of the metal sheet is placed on the fiber cloth when being laid, the other half of the metal sheet is exposed outside, and a layer of release agent is firstly coated on the surface of the metal sheet when being laid.
10. A defect detection method of an R-angle structure test block is characterized by comprising the following steps:
(1) designing a wedge block (6) matched with the arc transition position of the R-angle structure test block (4) according to the curvature radius of the R-angle structure test block (4) manufactured by the manufacturing method of any one of claims 7-9;
(2) placing an R-angle structure test block (4) on a workbench, enabling the bottom of the arc transition position of the R-angle structure test block (4) to be in contact with the workbench and supported at the outer sides of the bottoms of two flat plates of the R-angle structure test block (4), enabling the R-angle structure test block (4) to be in a stable state, and then adding water at the arc transition position;
(3) measuring the actual depth of an artificial defect formed by a preset metal sheet by using a caliper, placing the wedge block (6) at the arc transition position of the R-angle structure test block and connecting the wedge block with the phased array probe (5), controlling a plurality of array elements in the phased array probe (5) to transmit ultrasonic sound beams (7) by using a phased array ultrasonic flaw detector, wherein the array elements are uniformly distributed, so that the ultrasonic sound beams (7) can cover the arc transition position below the phased array probe (5); then calculating to obtain the propagation speed of the ultrasonic wave according to the actual depth of the defect and the propagation time of the ultrasonic wave, and then inputting the propagation speed into the phased array flaw detector;
(4) and then, taking the propagation speed as a reference, continuously placing the wedge block (6) at the arc transition position of the test block with the R-angle structure, controlling a plurality of array elements in the phased array probe (5) to emit ultrasonic sound beams (7) through the phased array ultrasonic flaw detector, and then stably moving the wedge block (6) and the phased array probe (5) along the extension direction of the R angle to obtain the ultrasonic detection map.
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| CN113324902A (en) * | 2021-05-13 | 2021-08-31 | 山东非金属材料研究所 | Reference block for composite armor plate debonding defect knocking detection and preparation method thereof |
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| CN114942269A (en) * | 2022-05-30 | 2022-08-26 | 上海晟纤复合材料科技有限公司 | Composite material complex cross section self-adaptive nondestructive testing device |
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| CN113324902A (en) * | 2021-05-13 | 2021-08-31 | 山东非金属材料研究所 | Reference block for composite armor plate debonding defect knocking detection and preparation method thereof |
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| CN113720664A (en) * | 2021-08-20 | 2021-11-30 | 中国飞机强度研究所 | Manufacturing method of reference block for detecting layering defects of composite material laminated plate structure |
| CN113720664B (en) * | 2021-08-20 | 2024-05-24 | 中国飞机强度研究所 | Manufacturing method of reference block for detecting layering defects of composite material laminate structure |
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