CN218019711U - Low-vacuum hot-press forming combined device for resin-based composite material workpiece - Google Patents
Low-vacuum hot-press forming combined device for resin-based composite material workpiece Download PDFInfo
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- CN218019711U CN218019711U CN202220107799.4U CN202220107799U CN218019711U CN 218019711 U CN218019711 U CN 218019711U CN 202220107799 U CN202220107799 U CN 202220107799U CN 218019711 U CN218019711 U CN 218019711U
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Abstract
The invention provides a low-vacuum hot-press molding combination device for a resin-based composite material part, wherein an upper cavity combination and a lower cavity combination form a closed cavity through a sealing ring and a connecting bolt, the inside of the closed cavity is divided into a negative pressure area and a compressed gas area by auxiliary materials for molding the composite material part, and the negative pressure area and the compressed gas area are isolated from each other to keep airtight; and placing the prepreg blank of the resin matrix composite material part into the cavity of the lower cavity combination, and performing vacuum hot-press molding to obtain the resin matrix composite material part. The invention has simple structure and convenient manufacture, can be used as a special device for trial production and batch production of small-size shell curved surface workpieces, greatly reduces the consumption of ineffective high-temperature/high-pressure gas, realizes low-cost production of composite material workpieces, has wide application prospect, and can realize the molding of the composite material prepreg with the air pressure below 0.8MPa and the curing temperature below 200 ℃.
Description
Technical Field
The invention relates to the field of composite material processing, in particular to a composite material forming device which is suitable for trial production and batch production of small-size shell type curved surface workpieces.
Background
The resin-based composite material has the characteristics of light weight, high strength and anisotropy, can be used as a structural function integrated part to be increasingly widely applied to military, civil and trade mechanical electrical products, and the autoclave is corresponding general molding equipment and is provided with heating, pressurizing and negative pressure to ensure that the module meets the process requirements. The resin-based composite prepreg applicable to the autoclave is reinforced by adopting continuous fibers and fabrics thereof, is compounded with the resin matrix by infiltration into a sheet-shaped coiled material by a solvent method or a hot melting method, is frozen and stored at a low temperature, and needs to be thawed before use to recover the viscosity; the composite material part is laminated and paved into a blank before being cured and molded, then the blank is placed in a negative pressure environment for compaction, and finally the corresponding heating rate is adopted to realize the whole process requirements of heating, pressurizing, heat preservation, pressure maintaining, cooling and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a low-vacuum hot-press molding combination device for a resin-based composite material part. The invention aims to design a low-cost vacuum hot-press molding combination device for a resin-based composite material part aiming at the defects in the prior art so as to reduce the invalid high-temperature/high-pressure gas consumption of the composite material part in the molding guarantee links of heating, pressurizing, negative pressure and the like and realize the low cost of the composite material part. In order to achieve the purpose, the low-cost vacuum hot-press forming combined device provided by the invention comprises an upper cavity, a lower cavity, a support frame, a vacuum pump/gas compressor, a pipeline and other parts which are combined.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a vacuum hot-press molding combination device for a resin-based composite material part comprises an upper cavity combination (1), a lower cavity combination (2), a support frame (3), a sealing ring (4) and a connecting bolt (5); when the composite material sealing device works, the upper cavity combination (1) and the lower cavity combination (2) form a closed cavity through the sealing ring (4) and the connecting bolt (5), the inside of the closed cavity is divided into a negative pressure area and a compressed gas area by an auxiliary material (6) for forming a composite material workpiece, and the negative pressure area and the compressed gas area are isolated from each other to keep airtight; and (3) placing a prepreg blank of the resin matrix composite material part into the cavity of the lower cavity assembly (2), sequentially paving a full-penetration adhesive tape, a non-porous film, an air felt and a vacuum bag film above the prepreg blank, adhering the periphery of the vacuum bag film to a metal part in the closed cavity by using a sealant strip, and carrying out vacuum hot-press molding on the resin matrix composite material part vacuum hot-press molding assembly and the prepreg blank in the cavity to obtain the resin matrix composite material part.
The upper cavity combination (1) comprises an upper cavity (7), an upper temperature control heating plate (8), a compressed gas hose joint (9) and a gas compressor, and a gas hose (10), wherein the upper cavity (7) in the upper cavity combination (1) is of a single-sided convex cavity structure with a flange at the periphery, the upper temperature control heating plate (8) is installed on the outer side of the convex cavity of the upper cavity (7), the size of the upper temperature control heating plate (8) is smaller than that of the upper cavity (7), the compressed gas hose joint (9) is positioned outside the upper temperature control heating plate (8) and communicated with the cavity of the upper cavity (7), and a through hole is formed in the flange and used for connecting the lower cavity combination (2); the periphery of the edge of the convex cavity of the upper cavity (7) is provided with an annular sealing groove, so that the vacuum hot press molding combination device is ensured to be firmly sealed in an internal pressure bearing state; an upper temperature control heating plate (8) is attached to the upper part of the outer wall of the convex cavity of the upper cavity (7), so that the temperature rise and heat preservation technological requirements are met in the curing and forming process of the composite material part, the composite material part is heated in a conduction mode, an auxiliary device is not heated and convection is avoided, and the power consumption is low; a compressed gas hose connector (9) is arranged at the bottom of a convex cavity body surrounded by an annular sealing groove of the upper cavity body (7), the compressed gas hose connector (9) is connected with a gas compressor (10) through a gas hose, compressed gas is provided for the curing and forming process of the composite material workpiece, the pressure stability is ensured, and the inside of the workpiece is ensured to be compact and uniform; because the cavity volume is small, the gas consumption is small, the power consumption of the corresponding gas compressor (10) and the gas hose is small, and a large amount of energy consumption is saved.
The lower cavity assembly (2) comprises 4 parts including a lower cavity (11), a lower temperature control heating plate (12), a vacuum pipe joint (13), a vacuum pump and a negative pressure hose (14), wherein the lower cavity (11) is a single-sided cavity structure with flanges at the periphery, a prepreg green body and auxiliary materials of resin matrix composite materials are placed in the cavity structure, the depth and the length and the width of the cavity are not smaller than those of the prepreg green body, the prepreg green body and the auxiliary materials are completely covered, and the periphery of a vacuum bag film is adhered to metal in the closed cavity by a sealant strip; an annular sealing groove is formed in the periphery of the edge of the concave cavity of the lower cavity (11) and used for placing a sealing ring (4), and a flange through hole in the periphery of the annular sealing groove is used for connecting the upper cavity combination (1) to ensure that the vacuum hot press forming combination device is firmly sealed in an internal pressure-bearing state; a lower temperature control heating plate (12) is attached to the lower part of the outer wall of the concave cavity of the lower cavity (11), so that the temperature rise and heat preservation technological requirements are met in the curing and forming process of the composite material part, the composite material part is heated in a conduction mode, an auxiliary device is not heated and convection is avoided, and the power consumption is low; a vacuum pipe joint (13) is arranged at the bottom of a concave cavity surrounded by an annular sealing groove of the lower cavity (11), the vacuum pipe joint (13) is connected with a vacuum pump (14) through a negative pressure hose to provide a negative pressure environment for the curing and forming process of the composite material workpiece blank, and forms a pressure difference with air under pressure, so that the pressure stability is ensured, and the inside of the workpiece is ensured to be compact and uniform; because the cavity volume is small, the power consumption of the corresponding negative pressure hose and the vacuum pump (14) is small, and a large amount of energy consumption can be saved.
Go up cavity (7), lower cavity (11) and be the cold-rolled steel sheet material, adopt the integral processing of milling to form of drawing, the through-hole on the flange is for going up cavity (7) and cavity (11) down and once only joining in marriage to beat the completion, guarantees that the location is accurate, and the laminating of flange plane is inseparable.
Support frame (3) are integral enclosure frame structure for the composite set that cavity combination (2) and last cavity combination (1) formed under the support, cavity accuse temperature hot plate and ground contact caused the damage under avoiding, and 4 supporting legs height can be adjusted simultaneously, and it is the limit to use personnel to spread the comfortable convenience of layer operation.
The sealing ring (4) is of an integral structure and is embedded in an annular sealing groove of the lower cavity (11), when the upper cavity (7) and the lower cavity (11) are connected in an aligning mode, the annular sealing groove of the upper cavity (7) and the annular sealing groove of the lower cavity (11) are aligned to compress the sealing ring (4) to form an annular sealing structure, and compressed gas in the sealing cavity forms sealing self-locking.
The connecting bolt (5) is an M16 full-thread bolt and is used for quickly connecting the upper cavity (7) and the lower cavity (11), the length of a screw rod of the connecting bolt (5) is greater than the sum of the thicknesses of flanges of the upper cavity (7) and the lower cavity (11), and the mounting requirements of 1 piece of each of the flat cushion, the elastic cushion and the nut are met.
The compressed gas hose joint (9) and the vacuum pipe joint (13) are both stainless steel internal thread structures.
Go up well cavity (7) in cavity combination (1) and be dull and stereotyped structure, go up accuse temperature hot plate (8) and install in dull and stereotyped top, compressed gas hose connector (9) are located outside accuse temperature hot plate (8) coverage, compressed gas hose connector (9) and the cavity part intercommunication of cavity combination (2) down, compressed gas hose connector (9) are linked together through gas hose and gas compressor (10), dull and stereotyped edge sets up the through-hole and is used for connecting cavity combination (2) down.
The low-cost vacuum hot-press molding combination device for the resin-based composite material parts comprises a support frame (3), a sealing ring (4), 36 sets of connecting bolts (5), an upper cavity (7), an upper temperature control heating plate (8), a compressed gas hose joint (9), a set of gas compressor and a gas hose (10), a lower cavity (11), a lower temperature control heating plate (12), a vacuum pipe joint (13) and a set of vacuum pump (14); the auxiliary material (6) for forming is a disposable auxiliary material for curing and forming a resin-based composite material part and does not belong to the fixed part of the device.
The invention has the beneficial effects that:
1) The vacuum hot-press molding combination device for the resin-based composite material workpiece has a simple structure, is convenient to manufacture, and can be used as a special device for trial production and batch production of small-size shell type curved surface workpieces.
2) Compared with an autoclave, the vacuum hot-press molding combination device for the resin-based composite material workpiece greatly reduces the consumption of ineffective high-temperature/high-pressure gas, realizes the low-cost manufacture of the composite material workpiece, and has wide application prospect.
3) The vacuum hot-press molding combination device for the resin-based composite material part can realize the molding of the composite material prepreg with the air pressure below 0.8MPa and the curing temperature below 200 ℃, and can be used for the curing molding of the composite material parts of epoxy resin prepreg, bismaleimide resin prepreg and cyanate resin prepreg.
Drawings
FIG. 1 is a schematic diagram of the structure of the combination device of the present invention.
Fig. 2 is a schematic view of an upper chamber assembly.
Fig. 3 is a schematic view of the lower cavity assembly structure.
Fig. 4 is a schematic view of the supporting frame structure.
Fig. 5 is a schematic view of a seal ring structure.
Fig. 6 is a schematic structural view of the upper chamber, in which fig. 6 (a) is a front view of the upper chamber, fig. 6 (b) is a side view of the upper chamber, and fig. 6 (c) is a perspective view of the upper chamber.
Fig. 7 is a schematic view of the lower chamber structure, fig. 7 (a) is a front view of the lower chamber, fig. 7 (b) is a side view of the lower chamber, and fig. 7 (c) is a perspective view of the lower chamber.
The device comprises a shell, an upper cavity assembly, a lower cavity assembly, a support frame, a sealing ring, a connecting bolt, an auxiliary material, an upper cavity, an upper temperature control heating plate, a compressed gas hose joint, a gas compressor, a lower cavity, a lower temperature control heating plate, a vacuum pipe joint and a vacuum pump, wherein the upper cavity assembly is 1-the upper cavity assembly, the lower cavity assembly is 2-the lower cavity assembly, the support frame is 3-the sealing ring is 4-the connecting bolt, the auxiliary material is 6-the upper cavity assembly, the upper cavity assembly is 8-the upper temperature control heating plate, the compressed gas hose joint is 9-the gas compressor, the lower cavity assembly is 11-the lower cavity assembly, the lower temperature control heating plate is 12-the vacuum pipe joint is 13-the vacuum pipe joint and the vacuum pump is 14-the vacuum pump.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
A vacuum hot-press molding combination device for a resin-based composite material part comprises an upper cavity combination (1), a lower cavity combination (2), a support frame (3), a sealing ring (4) and a connecting bolt (5); when the composite material sealing device works, the upper cavity combination (1) and the lower cavity combination (2) form a closed cavity through the sealing ring (4) and the connecting bolt (5), the inside of the closed cavity is divided into a negative pressure area and a compressed gas area by an auxiliary material (6) for forming a composite material workpiece, and the negative pressure area and the compressed gas area are isolated from each other to keep airtight; and (3) placing a prepreg blank of the resin matrix composite material part into the cavity of the lower cavity assembly (2), sequentially paving a full-penetration adhesive tape, a non-porous film, an air felt and a vacuum bag film above the prepreg blank, adhering the periphery of the vacuum bag film to a metal part in the closed cavity by using a sealant strip, and carrying out vacuum hot-press molding on the resin matrix composite material part vacuum hot-press molding assembly and the prepreg blank in the cavity to obtain the resin matrix composite material part.
The upper cavity combination (1) comprises an upper cavity (7), an upper temperature control heating plate (8), a compressed gas hose joint (9) and a gas compressor, and a gas hose (10), wherein the upper cavity (7) in the upper cavity combination (1) is of a single-sided convex cavity structure with a flange at the periphery, the upper temperature control heating plate (8) is installed on the outer side of the convex cavity of the upper cavity (7), the size of the upper temperature control heating plate (8) is smaller than that of the upper cavity (7), the compressed gas hose joint (9) is positioned outside the upper temperature control heating plate (8) and communicated with the cavity of the upper cavity (7), and a through hole is formed in the flange and used for connecting the lower cavity combination (2); the periphery of the edge of the convex cavity of the upper cavity (7) is provided with an annular sealing groove, so that the vacuum hot press molding combination device is ensured to be firmly sealed in an internal pressure-bearing state; an upper temperature control heating plate (8) is attached to the upper part of the outer wall of the convex cavity of the upper cavity (7), so that the temperature rise and heat preservation technological requirements are met in the curing and forming process of the composite material part, the composite material part is heated in a conduction mode, an auxiliary device is not heated and convection is avoided, and the power consumption is low; a compressed gas hose connector (9) is arranged at the bottom of a convex cavity body surrounded by an annular sealing groove of the upper cavity body (7), the compressed gas hose connector (9) is connected with a gas compressor (10) through a gas hose, compressed gas is provided for the curing and forming process of the composite material workpiece, the pressure is stable, and the inside of the workpiece is compact and uniform; because the cavity volume is small, the gas consumption is small, the power consumption of the corresponding gas compressor and the gas hose (10) is small, and a large amount of energy consumption is saved.
The lower cavity assembly (2) comprises 4 parts including a lower cavity (11), a lower temperature control heating plate (12), a vacuum pipe joint (13), a vacuum pump and a negative pressure hose (14), wherein the lower cavity (11) is a single-face concave cavity structure with flanges at the periphery, a prepreg green body and auxiliary materials of a resin-based composite material part are placed in the concave cavity structure, the depth and the length and width of the cavity are not less than those of the prepreg green body, the prepreg green body and the auxiliary materials are required to be completely covered, and the periphery of a vacuum bag film is adhered to metal in a closed cavity by a sealant strip; an annular sealing groove is formed in the periphery of the edge of the concave cavity of the lower cavity (11) and used for placing a sealing ring (4), and a flange through hole in the periphery of the annular sealing groove is used for connecting the upper cavity combination (1) to ensure that the vacuum hot press forming combination device is firmly sealed in an internal pressure-bearing state; a lower temperature control heating plate (12) is attached to the lower part of the outer wall of the concave cavity of the lower cavity (11), so that the temperature rise and heat preservation technological requirements are met in the curing and forming process of the composite material part, the composite material part is heated in a conduction mode, an auxiliary device is not heated and convection is avoided, and the power consumption is low; a vacuum pipe joint (13) is arranged at the bottom of a concave cavity surrounded by an annular sealing groove of the lower cavity (11), the vacuum pipe joint (13) is connected with a vacuum pump (14) through a negative pressure hose to provide a negative pressure environment for the curing and forming process of the composite material workpiece blank, and forms a pressure difference with air under pressure, so that the pressure stability is ensured, and the inside of the workpiece is ensured to be compact and uniform; because the cavity volume is small, the power consumption of the corresponding negative pressure hose and the vacuum pump (14) is small, and a large amount of energy consumption can be saved.
Go up cavity (7), lower cavity (11) and be the cold-rolled steel sheet material, adopt the integral processing of milling to form of drawing, the through-hole on the flange is for going up cavity (7) and cavity (11) down and once only joining in marriage to beat the completion, guarantees that the location is accurate, and the laminating of flange plane is inseparable.
Support frame (3) are integral frame structure of enclosing for the composite set that support cavity combination (2) down and upper cavity combination (1) formed avoids cavity accuse temperature hot plate and ground contact to cause the damage down, and 4 supporting legs height can be adjusted simultaneously, and it is the limit to shop's layer comfortable operation convenience.
Sealing washer (4) are monolithic structure, inlay and put in the annular seal groove of cavity (11) down, go up cavity (7) and cavity (11) counterpoint when hookup down, go up the annular seal groove counterpoint of cavity (7) and cavity (11) down and compress tightly sealing washer (4), form annular seal structure, compressed gas forms sealed auto-lock in the sealed cavity.
The connecting bolt (5) is an M16 full-thread bolt and is used for quickly connecting the upper cavity (7) and the lower cavity (11), the length of a screw rod of the connecting bolt (5) is greater than the sum of the thicknesses of flanges of the upper cavity (7) and the lower cavity (11), and the mounting requirements of 1 piece of each of the flat cushion, the elastic cushion and the nut are met.
The compressed gas hose joint (9) and the vacuum pipe joint (13) are both stainless steel internal thread structures.
Go up well cavity (7) in cavity combination (1) and be dull and stereotyped structure, go up accuse temperature hot plate (8) and install in dull and stereotyped top, compressed gas hose connector (9) are located outside accuse temperature hot plate (8) coverage, compressed gas hose connector (9) and the cavity part intercommunication of cavity combination (2) down, compressed gas hose connector (9) are linked together through gas hose and gas compressor (10), dull and stereotyped edge sets up the through-hole and is used for connecting cavity combination (2) down.
The low-cost vacuum hot press molding combination device for the resin-based composite material parts comprises a support frame (3), a sealing ring (4), 36 sets of connecting bolts (5), an upper cavity (7), an upper temperature control heating plate (8), a compressed gas hose joint (9), a set of gas compressor and gas hose (10), a lower cavity (11), a lower temperature control heating plate (12), a vacuum pipe joint (13), a set of vacuum pump and a negative pressure hose (14); the auxiliary material (6) for forming is a disposable auxiliary material for curing and forming a resin-based composite material part and does not belong to the fixed part of the device.
Claims (9)
1. The utility model provides a low vacuum hot briquetting composite set of resin base combined material finished piece, includes cavity combination (1) and cavity combination (2), support frame (3), sealing washer (4), coupling bolt (5) down, its characterized in that:
the resin-based composite material part vacuum hot press molding combination device is characterized in that an upper cavity combination (1) and a lower cavity combination (2) form a closed cavity through a sealing ring (4) and a connecting bolt (5), the inside of the closed cavity is divided into a negative pressure area and a compressed gas area by an auxiliary material (6) for molding of a composite material part, and the negative pressure area and the compressed gas area are isolated from each other to keep airtightness.
2. The resin-based composite material product low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
the upper cavity assembly (1) comprises an upper cavity (7), an upper temperature control heating plate (8), a compressed gas hose joint (9) and a gas compressor (10) and a gas hose, wherein the upper cavity (7) in the upper cavity assembly (1) is of a single-sided convex cavity structure with a flange at the periphery, the upper temperature control heating plate (8) is installed on the outer side of the convex cavity of the upper cavity (7), the size of the upper temperature control heating plate (8) is smaller than that of the upper cavity (7), the compressed gas hose joint (9) is positioned outside the upper temperature control heating plate (8) and communicated with the cavity of the upper cavity (7), and a through hole is formed in the flange and used for connecting the lower cavity assembly (2); an annular sealing groove is formed in the periphery of the edge of the convex cavity of the upper cavity (7), an upper temperature control heating plate (8) is attached to the upper portion of the outer wall of the convex cavity of the upper cavity (7), a compressed gas hose connector (9) is installed at the bottom of the convex cavity surrounded by the annular sealing groove of the upper cavity (7), and the compressed gas hose connector (9) is connected with a gas compressor (10) through a gas hose.
3. The resin-based composite material part low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
the lower cavity combination (2) comprises 4 parts including a lower cavity (11), a lower temperature control heating plate (12), a vacuum pipe joint (13), a vacuum pump (14) and a negative pressure hose, wherein the lower cavity (11) is a single-face cavity structure with flanges at the periphery, a prepreg green body and auxiliary materials of a resin-based composite material part are placed in the cavity structure, the depth and the length and width of the cavity are not less than those of the prepreg green body, the prepreg green body and the auxiliary materials are required to be completely covered, and the periphery of a vacuum bag film is adhered to metal in a closed cavity by a sealant strip; the edge of the cavity of the lower cavity (11) is provided with an annular sealing groove all around for placing a sealing ring (4), a flange through hole on the periphery of the annular sealing groove is used for connecting the upper cavity combination (1), a lower temperature control heating plate (12) is attached to the lower part of the outer wall of the cavity of the lower cavity (11), a vacuum pipe joint (13) is installed at the bottom of the cavity surrounded by the annular sealing groove of the lower cavity (11), and the vacuum pipe joint (13) is connected with a vacuum pump (14) through a negative pressure hose.
4. The resin-based composite material product low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
go up cavity (7), cavity (11) down and be the cold-rolled steel sheet material, adopt the integral to draw and mill processing and form, the through-hole on the flange is for going up cavity (7) and cavity (11) down once only joining in marriage to beat the completion.
5. The resin-based composite material product low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
support frame (3) are integral enclosure frame structure for the composite set that cavity combination (2) and last cavity combination (1) formed under the support, cavity accuse temperature hot plate and ground contact caused the damage under avoiding, and 4 supporting legs height can be adjusted simultaneously, and it is the limit to use personnel to spread the comfortable convenience of layer operation.
6. The resin-based composite material part low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
the sealing ring (4) is of an integral structure and is embedded in an annular sealing groove of the lower cavity (11), when the upper cavity (7) and the lower cavity (11) are connected in an aligning mode, the annular sealing groove of the upper cavity (7) and the annular sealing groove of the lower cavity (11) are aligned to compress the sealing ring (4) to form an annular sealing structure, and compressed gas in the sealing cavity forms sealing self-locking.
7. The resin-based composite material product low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
the connecting bolt (5) is an M16 full-thread bolt and is used for quickly connecting the upper cavity (7) and the lower cavity (11), the length of a screw rod of the connecting bolt (5) is greater than the sum of the thicknesses of flanges of the upper cavity (7) and the lower cavity (11), and the mounting requirements of 1 piece of each of the flat cushion, the elastic cushion and the nut are met.
8. The resin-based composite material part low-vacuum hot-press molding combination device as claimed in claim 2, wherein:
the compressed gas hose joint (9) and the vacuum pipe joint (13) are both stainless steel internal thread structures.
9. The resin-based composite material part low-vacuum hot-press molding combination device as claimed in claim 1, wherein:
go up well cavity (7) in cavity combination (1) and be dull and stereotyped structure, go up accuse temperature hot plate (8) and install in dull and stereotyped top, compressed gas hose connector (9) are located outside accuse temperature hot plate (8) coverage, compressed gas hose connector (9) and the cavity part intercommunication of cavity combination (2) down, compressed gas hose connector (9) are linked together through gas hose and gas compressor (10), dull and stereotyped edge sets up the through-hole and is used for connecting cavity combination (2) down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220107799.4U CN218019711U (en) | 2022-01-15 | 2022-01-15 | Low-vacuum hot-press forming combined device for resin-based composite material workpiece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220107799.4U CN218019711U (en) | 2022-01-15 | 2022-01-15 | Low-vacuum hot-press forming combined device for resin-based composite material workpiece |
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