CN214419651U - Plasma-assisted laser in-situ forming fiber laying head - Google Patents
Plasma-assisted laser in-situ forming fiber laying head Download PDFInfo
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- CN214419651U CN214419651U CN202120107299.6U CN202120107299U CN214419651U CN 214419651 U CN214419651 U CN 214419651U CN 202120107299 U CN202120107299 U CN 202120107299U CN 214419651 U CN214419651 U CN 214419651U
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Abstract
The utility model belongs to the composite material field of making, in particular to head is put to fashioned fibre of supplementary laser normal position of plasma. The utility model integrates the yarn box and the laying device into a whole, and can realize the full-automatic integration of the functions of wire feeding, surface treatment, laying, compaction, shearing, re-feeding and the like; the low-temperature plasma process is adopted to perform online surface modification on the prepreg in the laying process, compared with the existing automatic laying process, the utility model can effectively reduce the heating temperature of the prepreg ribbon on the premise of achieving the same bonding effect, further reduce the temperature gradient, radically reduce the thermal stress, and solve the problems of warping, angle rebound, deformation and the like of the product; the utility model discloses reduced preimpregnation silk ribbon heating temperature, the energy that needs is lower, and is energy-concerving and environment-protective more.
Description
Technical Field
The utility model belongs to the composite material field of making, in particular to head is put to fashioned fibre of supplementary laser normal position of plasma.
Background
The low-cost manufacturing technology is a prerequisite for the wide application of advanced resin-based composite materials and is a core problem concerned in the field of composite materials internationally. Experience in developed countries in europe and the united states for over 30 years has shown that the automated composite placement technique is one of the most competitive, low-cost manufacturing techniques. The automatic laying technology organically combines a material process, a numerical control machine tool and CAD/CAM software, realizes full automation of functions including yarn feeding, laying, compacting, shearing, re-feeding and the like, is a material-structure integrated additive manufacturing technology, remarkably improves manufacturing efficiency and reduces raw material loss.
Thermoplastic composite materials are becoming ideal materials for aerospace composite members due to their excellent properties of high toughness, recyclability, etc. The automatic laying technology is used for preparing the thermoplastic composite material component, can be formed in an in-situ consolidation mode, is high in processing efficiency, and breaks through the limitation of the autoclave technology on the site and the size of component forming. Therefore, the importance of the thermoplastic composite material automatic laying technology in the aerospace field is increasingly highlighted. However, thermoplastic composites are temperature sensitive and the prepreg repeatedly undergoes melting and cooling under the action of local instantaneous high temperature and pressure during layup. The temperature gradient inside the ply will cause thermal stress and thermal deformation inside the composite material, which in turn will have an adverse effect on the mechanical properties and dimensional accuracy of the formed member. Therefore, residual thermal stress and thermal deformation control are important issues to be solved.
Chinese patents CN 105128363B and CN111619138A disclose that the residual stress is released and the thermal deformation is reduced by reheating and compacting, but such post-treatment method has the disadvantages of low efficiency, high energy consumption, etc. CN 104669631B discloses a method for compensating for thermal deformation by die correction for an L-shaped composite material, but for a member having a complicated shape, thermal deformation compensation for each part must be achieved at the same time, and thus the amount of die correction is large, and actual operation is hardly achieved.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a head is put to fashioned fibre of supplementary laser normal position of plasma.
The technical scheme of the utility model:
a fiber laying head for plasma-assisted laser in-situ forming comprises a prepreg box and a rolling laying box;
the top of the prepreg box is provided with a connecting flange 13, and the fiber laying head is arranged on an external driving device through the connecting flange 13; a conveying box 14 and a plurality of unreeling shafts 16 are arranged in the prepreg box; the conveying box 14 is positioned in the middle of the prepreg box, a plurality of through holes are symmetrically formed in the side surface of the conveying box 14, and a through hole is formed in the bottom surface of the conveying box 14; a plurality of unwinding shafts 16 are annularly and symmetrically arranged around the conveying box 14, the prepreg tows 17 are wound on the unwinding shafts 16, and the prepreg tows 17 are unwound from the unwinding shafts 16 and then are turned to through holes in the side surface of the conveying box 14 through guide wheels b15, so that the prepreg tows 17 are conveyed into the conveying box 14;
the inside or the outside of the rolling laying box is provided with a tensioner, a refeeding device, a plasma surface treatment device, a shearing and bundling device, a heating device and a rolling device;
the tensioner is positioned at the upper part in the rolling and silk-spreading box and comprises a connecting rod 11, a plurality of tension compression rollers 10, a tension cylinder 12, two conveying rollers 18 and a motor 19; a plurality of tension press rollers 10 are connected through a connecting rod 11, an output shaft of a tension cylinder 12 is connected with the middle part of the connecting rod 11, and the tension cylinder 12 provides downward pressure for the connecting rod 11; the two conveying rollers 18 are arranged below the tension compression rollers 10 and are positioned at the position corresponding to the lower part of the gap between the two tension compression rollers 10, and the motor 19 drives the two conveying rollers 18 to rotate through a belt; a plurality of prepreg tows 17 enter the rolling and fiber-laying box from a through hole on the bottom surface of the conveying box 14, are fed into a tensioner through a guide wheel a9, are tensioned through the cooperation of a tension roller 10 and a conveying roller 18 to tension the prepreg tows 17, and are conveyed downwards through the conveying roller 18;
the plasma surface treatment device comprises a distance sensor 5, a telescopic device 6 and two plasma spray guns 4; one of the plasma spray guns 4 is arranged in the rolling and fiber-spreading box and is positioned below the side of the tensioner, the prepreg tows 17 conveyed out of the tensioner are conveyed downwards through a guide wheel a9, and the plasma spray guns 4 perform plasma surface treatment on the prepreg tows 17; the other plasma spray gun 4 is arranged on a shell at the lower part of the rolling and silk-spreading box through a telescopic device 6, the surface of the laid pre-impregnated silk ribbon on the die 25 is subjected to plasma treatment, a distance sensor 5 is arranged on the plasma spray gun 4, the distance between the plasma spray gun 4 and the surface of the die 25 is measured through the distance sensor 5, and then the distance between the muzzle of the plasma spray gun 4 and the surface of the die 25 is adjusted in real time through the telescopic device 6;
the re-feeding device is positioned in the rolling and filament-laying box and comprises a clamping roller 7 and a magnetic powder clutch 8, and the magnetic powder clutch 8 provides driving force for the clamping roller 7; the prepreg tows 17 after plasma treatment by the plasma spray gun 4 are sent into a pinch roll 7 of a re-feeding device to provide driving force for the transmission of the prepreg tows 17;
the shearing and bundling device comprises a bundling device 2 and a shearing device 3; the shearing device 3 controls the shearing device 3 to shear part of the prepreg tows 17 through the control device according to the requirements of the number of laid fibers, so that the prepreg tows 17 conveyed from the re-conveying device are sheared; bundling a plurality of prepreg tows 17 into a prepreg silk ribbon 23 through a bundling device 2;
the heating device is a laser emitter 1 and is arranged below the side of the shearing and bundling device, and laser emitted by the laser emitter 1 heats the prepreg silk ribbon 23 to convert the prepreg silk ribbon 23 into a viscous state;
the rolling device is positioned at the lower part of the rolling and silk laying box and comprises a pressure cylinder 20, a pressure sensor 21, a pressure transmission rod 22 and a press roller 24; the pressing roller 24 is positioned outside the rolling and silk laying box and is connected with an output shaft of the pressure cylinder 20 through a pressure transmission and reduction rod 22, and the end part of the pressure cylinder 20 is provided with a pressure sensor 21 for measuring laying pressure in real time; the prepreg tapes 23 heated by the heating device are rolled by a press roller 24 and laid on a die 25 to be laid with filaments.
The unreeling shaft 16 is a horizontal unreeling shaft.
The material of the press roller 24 is silicon rubber.
The plasma-assisted laser in-situ forming fiber placement head is used for fiber placement, is connected with a robot arm through a connecting flange 13, and lays fiber prepreg on a mold 25 along with the movement track of the robot arm according to a designed laying mode, and comprises the following specific steps:
the method comprises the following steps that fiber prepreg is processed into prepreg tows 17, the prepreg tows 17 are unreeled from an unreeling shaft 16 in a prepreg box and then are turned to a conveying box 14 through a guide wheel b15, a plurality of prepreg tows 17 are sent out from the conveying box 14 and then are turned to a tensioner through a guide wheel a9, a tension cylinder 12 in the tensioner presses a connecting rod 11 downwards, the connecting rod 11 drives a tension compression roller 10 to press downwards, a motor 19 drives a conveying roller 18 to rotate, the tension compression roller 10 is matched with the conveying roller 18, the prepreg tows 17 are rolled to provide wire feeding tension, and the prepreg tows 17 are conveyed forwards; conveying the prepreg tows 17 to the side of a plasma spray gun 4 in a prepreg box in a plasma surface treatment device, and carrying out plasma surface treatment on a plurality of groups of prepreg tows 17 by the plasma spray gun 4; meanwhile, a plasma spray gun 4 positioned outside the prepreg box carries out plasma treatment on the surface of the laid prepreg filaments on the mold 25, the distance between the plasma spray gun 4 and the surface of the mold 25 is measured through a distance sensor 5, and then the distance between a gun mouth of the spray gun and the surface of the mold 25 is adjusted in real time through a telescopic device 6;
a plurality of prepreg tows 17 subjected to plasma surface treatment are turned to a re-feeding device through a guide wheel a9, and a clamping roller 7 and a magnetic powder clutch 8 in the re-feeding device provide driving force for transmission of the prepreg tows 17; a plurality of prepreg tows 17 conveyed out of the re-conveying device enter a shearing and bundling device, a control device controls a shearing device 3 to shear part of the prepreg tows 17 according to the requirements of the number of laid fibers, and then the plurality of prepreg tows 17 are bundled into a prepreg silk ribbon 23 through a bundling device 2; the prepreg silk ribbon 23 is heated by laser emitted by a laser emitter 1 in front of the prepreg silk ribbon 23 so that the prepreg silk ribbon 23 is converted into a viscous state;
a pressure cylinder 20 in the rolling device presses a press roller 24 downwards through a pressure transmission rod 22, and the laying pressure of the pressure cylinder 20 is measured in real time through a pressure sensor 21; the prepreg silk ribbon 23 heated by the laser emitter 1 is rolled by a compression roller 24 and laid on a die 25 to be laid with silk.
Further, the fiber prepreg is a fiber-reinforced thermoplastic composite material, the fiber is a carbon fiber, a glass fiber, a basalt fiber or an aramid fiber, and the matrix is polyether ether ketone (PEEK), polyether ketone (PEK), polyether ketone (PEKK), polyether ether ketone (PEEKK), polyether ketone ether ketone (PEKEKK), polyphenylene sulfide (PPS), polyether imide (PEI), polyether sulfone (PES), Polyamide (PA) or modified polyaryletherketone (modified PAEK).
Further, the die 25 to be laid is a plane or a curved surface, and in the fiber laying and winding process, the die 25 is a mandrel with an equal section or a variable section.
Furthermore, the number of the unwinding shafts 16 is 2-64, and each unwinding shaft is controlled by a magnetic powder clutch to control unwinding tension.
Further, the width of the prepreg tows 17 is 2-30 mm, and the thickness of the prepreg tows is less than 0.4 mm.
Furthermore, the tensioner has two functions of tension application and tension measurement, and realizes the closed-loop control of wire feeding tension.
Further, the plasma surface treatment performed by the plasma torch 4 is sliding arc jet plasma, and the two plasma torches 4 realize double-sided plasma treatment of the bonding surface. The distance between the muzzle of the plasma spray gun 4 and the surface of the pre-impregnated fiber bundle 17 or the mold 25 is 2-50 mm, the plasma discharge power is 10-1000W, and the introduced gas is one or more of oxygen, nitrogen, ammonia, argon and helium.
Further, the laser light emitting deviceThe power density of the ejector 1 is 5-35W/cm2The temperature sensor is built in, and the heating temperature is controlled between the melting temperature and the decomposition temperature of the matrix material of the fiber prepreg by adjusting the emission power.
The utility model discloses the technical problem who solves:
the thermoplastic composite is temperature sensitive and the prepreg undergoes repeated melting and cooling under the action of local instantaneous high temperature and high pressure during the lay-up process. The temperature gradient in the paving layer causes thermal stress and thermal deformation in the composite material, and further has adverse effects on the mechanical property and the dimensional precision of a forming member, so that the defects of angle rebound, warping, deformation and the like of a product are caused.
The root of the thermal stress is that the heating temperature is high in the laying process, the prepreg needs to be fully heated and melted to reach a flowing state, and then the two layers of prepreg can be effectively bonded under the pressure action of the compression roller. The utility model discloses set out from the material characteristic, adopt low temperature plasma technology to carry out online surface modification to preimpregnation material putting the in-process to reduce required heating temperature and improve adhesion properties.
The utility model has the advantages that:
(1) the utility model discloses a fashioned fibre of supplementary laser normal position of plasma is spread head and is put the yarn case and put the device integration in an organic whole with putting, can realize sending silk, surface treatment, spread and paste, compaction, shearing and resend the full-automatic integration of wait function.
(2) The utility model discloses a fashioned fibre of supplementary laser normal position of plasma is spread and is put head and adopt low temperature plasma technology to carry out online surface modification to preimpregnation material putting the in-process, compares present automatic technology of putting, under the prerequisite that reaches the same bonding effect, the utility model discloses can effectively reduce preimpregnation silk ribbon heating temperature, and then reduce temperature gradient, reduce thermal stress from the root, solve the warpage of product, angle resilience and deformation scheduling problem.
(3) The utility model discloses a supplementary laser in situ forming's of plasma fibre is spread and is put the spool of putting of head is horizontal, compares in traditional vertical installation, can effectively reduce prepreg when unreeling with put the shearing force of spool, improve tension control's precision.
(4) The utility model discloses a head is put to supplementary laser normal position fashioned fibre of plasma has reduced preimpregnation silk ribbon heating temperature, and the energy that needs is lower, and is energy-concerving and environment-protective more.
Drawings
Fig. 1 is a schematic diagram of the fiber placement structure formed in situ by plasma-assisted laser according to the present invention.
FIG. 2 is a prepreg placement diagram of the placement head.
In the figure: 1, a laser emitter, 2, a bundling device, 3, a shearing device and 4, a plasma spray gun;
5, a distance sensor, 6 of a telescopic device, 7 of a clamping roller, 8 of a magnetic powder clutch and 9 of a guide wheel a;
10 tension press rolls, 11 connecting rods, 12 tension cylinders, 13 connecting flanges and 14 conveying boxes;
15 guide wheels b, 16 unreeling shafts, 17 prepreg tows, 18 conveying rollers, 19 motors and 20 pressure cylinders;
21 pressure sensor, 22 pressure transmission rod, 23 prepreg silk ribbon, 24 pressure roller and 25 mould.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model discloses a fashioned fibre of supplementary laser normal position of plasma is spread head and is passed through flange 13 and install on the robotic arm, as shown in figure 1, the fibre is spread the head and is spread the layer mode according to the shop of laying of design with fibre preimpregnation material along with the movement track of robotic arm and cover on mould 25. A plurality of unwind reels 16 are mounted horizontally in a prepreg box as shown in figure 2. The laying process comprises six stages of wire feeding, surface treatment, shearing, laying, compaction and refeeding, and the six stages need to be repeated for multiple times in the laying process of one product.
Feeding wires: the prepreg tows 17 are unreeled from the respective unreeling shafts 16 and then conveyed into the conveying box 14 through the guide wheel b15, and then are turned to the tensioner through the guide wheel a9, and the wire feeding tension in the prepreg tows 17 is controlled in a closed loop mode through the expansion and contraction of the tension cylinder 12, so that the tension is kept constant.
Laying for the first layer: according to the requirement of the number of laid filaments, the shearing device 3 is controlled by the control device to shear part of the prepreg tows 17, then a plurality of prepreg tows 17 are bundled by the bundling device 2 to form a prepreg filament band 23, and a press roller 24 is used for compacting on a die 25 to complete the first layer of laying. And after the first layer is paved, the mechanical arm moves the fiber paving head to the beginning of the next layer.
Secondary wire feeding: the prepreg tows 17 are unreeled from the respective unreeling shafts 16 and then transferred to the conveying box 14 through the guide wheel b15, and then are turned to the tensioner through the guide wheel a9, and the wire feeding tension in the tows 17 is controlled in a closed loop mode through the expansion and contraction of the tension cylinder 12, so that the tension is constant.
Surface treatment: the two plasma spray guns 4 carry out plasma surface treatment on the surface to be bonded, and the surface of the surface to be bonded is subjected to chemical bond breakage and recombination to form new chemical structures such as free radicals and active groups. Wherein, the distance sensor on the lower plasma spray gun measures the distance between the spray gun and the surface of the mould in real time, and the distance of the plasma surface treatment is maintained to be a constant value by adjusting the distance in real time through the telescopic device.
Shearing, paving and compacting: according to the requirement of the number of laid filaments, the shearing device 3 is controlled by the control device to shear part of the prepreg tows 17, then a plurality of prepreg tows 17 are bundled by the bundling device 2 to form prepreg ribbons 23, the prepreg ribbons 23 are converted into viscous state under the irradiation of the laser emitter 1, and the viscous state is compacted in a die 25 by a press roll 24, so that interlayer adhesion is realized.
Re-feeding: when the second layer is paved, the mechanical arm moves the fiber paving head to the beginning of the next layer, and the plurality of prepreg tows 17 are bunched by the shearing device 3 and the bunching device 2 under the traction of the clamping roller 7 and the magnetic powder clutch 8 and are compacted by the compression roller 13 again.
And circulating the process of secondary wire feeding, surface treatment, shearing, paving, compacting and re-feeding until the product is laid.
Claims (6)
1. The plasma-assisted laser in-situ forming fiber laying head is characterized by comprising a prepreg box and a rolling laying box;
the top of the prepreg box is provided with a connecting flange (13), and the fiber laying head is arranged on an external driving device through the connecting flange (13); a conveying box (14) and a plurality of unreeling shafts (16) are arranged in the prepreg box; the conveying box (14) is positioned in the middle of the prepreg box, a plurality of through holes are symmetrically formed in the side surface of the conveying box (14), and a through hole is formed in the bottom surface of the conveying box (14); the plurality of unwinding shafts (16) are annularly and symmetrically arranged on the periphery of the conveying box (14), the prepreg tows (17) are wound on the unwinding shafts (16), and the prepreg tows (17) are unwound from the unwinding shafts (16) and then are turned to through holes in the side face of the conveying box (14) through guide wheels b (15), so that the prepreg tows (17) are conveyed into the conveying box (14);
the inside or the outside of the rolling laying box is provided with a tensioner, a refeeding device, a plasma surface treatment device, a shearing and bundling device, a heating device and a rolling device;
the tensioner is positioned at the upper part in the rolling and silk-spreading box and comprises a connecting rod (11), a plurality of tension press rollers (10), a tension cylinder (12), two conveying rollers (18) and a motor (19); the tension press rolls (10) are connected through a connecting rod (11), an output shaft of a tension cylinder (12) is connected with the middle part of the connecting rod (11), and the tension cylinder (12) provides downward pressure for the connecting rod (11); the two conveying rollers (18) are arranged below the tension compression rollers (10), the gap between the two tension compression rollers (10) corresponds to the lower position, and the motor (19) drives the two conveying rollers (18) to rotate through a belt; a plurality of prepreg tows (17) enter a rolling and fiber-paving box from through holes on the bottom surface of a conveying box (14), are fed into a tensioner through a guide wheel a (9), are tensioned through the cooperation of a tension compression roller (10) and a conveying roller (18) to be conveyed downwards, and the prepreg tows (17) are conveyed downwards through the conveying roller (18);
the plasma surface treatment device comprises a distance sensor (5), a telescopic device (6) and two plasma spray guns (4); one plasma spray gun (4) is arranged in the rolling and fiber-spreading box and is positioned below the side of the tensioner, the prepreg tows (17) conveyed out of the tensioner are conveyed downwards through a guide wheel a (9), and the plasma spray gun (4) carries out plasma surface treatment on the prepreg tows (17); the other plasma spray gun (4) is arranged on a shell at the lower part of the rolling and silk-spreading box through a telescopic device (6) and is used for carrying out plasma treatment on the surface of the pre-impregnated silk ribbon paved on the mould (25), a distance sensor (5) is arranged on the plasma spray gun (4), the distance between the plasma spray gun (4) and the surface of the mould (25) is measured through the distance sensor (5), and then the distance between the muzzle of the plasma spray gun (4) and the surface of the mould (25) is adjusted in real time through the telescopic device (6);
the heavy feeding device is positioned in the rolling and filament spreading box and comprises a clamping roller (7) and a magnetic powder clutch (8), and the magnetic powder clutch (8) provides driving force for the clamping roller (7); the prepreg tows (17) which are subjected to plasma treatment by the plasma spray gun (4) are sent into a pinch roller (7) of a re-feeding device, and driving force is provided for transmission of the prepreg tows (17);
the shearing and bundling device comprises a bundling device (2) and a shearing device (3); the shearing device (3) is used for controlling the shearing device (3) to shear part of the prepreg tows (17) through the control device according to the requirements of the number of laid tows, so that the prepreg tows (17) conveyed out of the re-conveying device are sheared; bundling a plurality of prepreg tows (17) into a prepreg silk ribbon (23) through a bundling device (2);
the heating device is a laser emitter (1) and is arranged below the side of the shearing and bundling device, and laser emitted by the laser emitter (1) heats the prepreg silk ribbon (23) to enable the prepreg silk ribbon (23) to be converted into a viscous state;
the rolling device is positioned at the lower part of the rolling and silk laying box and comprises a pressure cylinder (20), a pressure sensor (21), a pressure transmission rod (22) and a pressing roller (24); the compression roller (24) is positioned outside the rolling and silk laying box and is connected with an output shaft of the pressure cylinder (20) through a pressure transmission and compression rod (22), and the end part of the pressure cylinder (20) is provided with a pressure sensor (21) for measuring laying pressure in real time; the prepreg silk ribbon (23) heated by the heating device is rolled by a compression roller (24) and is laid on a die (25) to be laid with silk.
2. A plasma assisted laser in situ forming fiber placement head according to claim 1, wherein the unreeling shaft (16) is a horizontal unreeling shaft.
3. A plasma assisted laser in situ forming fibre placement head according to claim 1 or 2, characterised in that the pressure roller (24) is of silicone rubber.
4. A plasma-assisted laser in-situ forming fiber placement head according to claim 1 or 2,
the die (25) to be laid is a plane or a curved surface, and in the fiber laying and winding process, the die (25) is a mandrel with a uniform section or a variable section;
the number of the unreeling shafts (16) is 2-64, and the unreeling tension of each unreeling shaft is controlled by a magnetic powder clutch;
the tensioner has two functions of tension application and tension measurement, and realizes the closed-loop control of wire feeding tension.
5. A plasma-assisted laser in-situ forming fiber placement head according to claim 1 or 2, wherein the plasma surface treatment of the plasma torch (4) is a sliding arc jet plasma; the distance between the muzzle of the plasma spray gun (4) and the surface of the pre-impregnated tows (17) or the mold (25) is 2-50 mm, and the plasma discharge power is 10-1000W.
6. A plasma-assisted laser in-situ forming fiber placement head according to claim 1 or 2, wherein the laser emitter (1) has a power density of 5-35W/cm2And a temperature sensor is arranged in the temperature sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120107299.6U CN214419651U (en) | 2021-01-15 | 2021-01-15 | Plasma-assisted laser in-situ forming fiber laying head |
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| CN202120107299.6U CN214419651U (en) | 2021-01-15 | 2021-01-15 | Plasma-assisted laser in-situ forming fiber laying head |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895516A (en) * | 2021-01-15 | 2021-06-04 | 大连理工大学 | Plasma-assisted laser in-situ forming fiber laying head and laying method |
| CN117325483A (en) * | 2023-10-26 | 2024-01-02 | 浙江大学 | Laser in-situ material increasing and decreasing composite forming equipment and method for composite material member |
-
2021
- 2021-01-15 CN CN202120107299.6U patent/CN214419651U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895516A (en) * | 2021-01-15 | 2021-06-04 | 大连理工大学 | Plasma-assisted laser in-situ forming fiber laying head and laying method |
| CN117325483A (en) * | 2023-10-26 | 2024-01-02 | 浙江大学 | Laser in-situ material increasing and decreasing composite forming equipment and method for composite material member |
| CN117325483B (en) * | 2023-10-26 | 2024-05-03 | 浙江大学 | Laser in-situ material increasing and decreasing composite forming equipment and method for composite material member |
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