CN112248415B - Transverse-pressing type straight Z-shaped partition frame preforming device - Google Patents
Transverse-pressing type straight Z-shaped partition frame preforming device Download PDFInfo
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- CN112248415B CN112248415B CN202011039239.1A CN202011039239A CN112248415B CN 112248415 B CN112248415 B CN 112248415B CN 202011039239 A CN202011039239 A CN 202011039239A CN 112248415 B CN112248415 B CN 112248415B
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- clamping plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3076—Aircrafts
- B29L2031/3082—Fuselages
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to the technical field of composite material forming, in particular to a transverse-pressing type straight Z-shaped partition frame preforming device, which comprises: the web plate clamping die assembly comprises an upper clamping plate, a lower clamping plate and a clamping driving piece, wherein the upper clamping plate and the lower clamping plate are arranged oppositely, and the clamping driving piece is connected with the upper clamping plate; the contact surfaces of the upper clamping plate and the lower clamping plate are horizontal surfaces, and both the two side surfaces of the upper clamping plate and the two side surfaces of the lower clamping plate are perpendicular to the contact surfaces of the upper clamping plate and the lower clamping plate; the first wing plate driving assembly is arranged on one side face of the web plate clamping die assembly and comprises a top die and a first driving piece for driving the top die to move towards a first direction; the second wing plate driving assembly is arranged on the other side face of the web plate clamping die assembly and comprises a push die and a second driving piece for driving the push die to move towards the direction parallel to the first direction and in the opposite direction; the prepreg stacking plate forming device comprises a top die, a push die, a transverse pressing module, a transverse pressing driving piece and a transverse pressing piece, wherein the top die and the push die are respectively provided with the transverse pressing module, the transverse pressing module comprises the transverse pressing driving piece and the transverse pressing piece, and when the prepreg stacking plate is formed, the top die and the push die drive prepreg to be bent in opposite directions.
Description
Technical Field
The invention relates to the technical field of composite material forming, in particular to a transverse-pressing type straight Z-shaped partition frame preforming device.
Background
Along with the progress of composite material forming technology, the application range of composite materials is wider and wider, the fuselage bulkhead of the wide-body passenger plane is made of advanced composite materials in a large amount, the fuselage bulkhead is made of composite materials in a large amount, particularly, the straight Z-shaped bulkhead is used in the manufacturing process of the wide-body passenger plane in a large amount, and based on the requirements on the processing efficiency and the precision of the straight Z-shaped bulkhead are higher and higher.
In the prior art, a straight Z-shaped bulkhead is processed by arranging a die with a straight Z-shaped laminating surface, and positioning and rolling the prepreg by a pressing mechanism to convert the prepreg from an "I" shape to a "Z" shape. However, this process has a problem of uneven pressure applied to the prepreg, which tends to cause a problem of uneven thickness of the prepreg during the transition from the "I" shape to the "Z" shape.
In view of the above problems, the present inventors have actively studied and innovated based on practical experience and professional knowledge that is abundant over many years in engineering applications of such products, and have intended to create a device and a method for preforming a straight Z-shaped frame, so as to make the device and the method more practical.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the transverse pressing type straight Z-shaped partition frame preforming device improves the forming quality of the straight Z-shaped partition frame.
In order to achieve the purpose, the invention adopts the technical scheme that: a cross-pressing type straight Z-shaped partition frame preforming device comprises:
the web plate clamping die assembly comprises an upper clamping plate, a lower clamping plate and a clamping driving piece, wherein the upper clamping plate and the lower clamping plate are arranged oppositely, and the clamping driving piece is connected with the upper clamping plate; the clamping driving piece drives the upper clamping plate to be close to or far away from the lower clamping plate so as to clamp or release the position of a web plate of the prepreg laminated plate;
the contact surfaces of the upper clamping plate and the lower clamping plate are horizontal surfaces, and the two side surfaces of the upper clamping plate and the two side surfaces of the lower clamping plate are perpendicular to the contact surfaces of the upper clamping plate and the lower clamping plate and are used for molding wing plates at two ends of the prepreg laminated plate;
the first wing plate driving assembly is arranged on one side surface of the web plate clamping die assembly and comprises a top die and a first driving piece for driving the top die to move towards a first direction, and the first direction is parallel to the driving direction of the clamping driving piece;
the second wing plate driving assembly is arranged on the other side face of the web plate clamping die assembly and comprises a push die and a second driving piece which drives the push die to move towards the direction parallel to the first direction and in the opposite direction;
the prepreg laminating plate forming device comprises a top die, a push die, a transverse pressing driving piece, a transverse pressing piece and a transverse pressing piece, wherein the top die and the push die are both provided with the transverse pressing module, the transverse pressing module comprises the transverse pressing driving piece and the transverse pressing piece, when the prepreg laminating plate is formed, the top die and the push die drive prepreg bending towards opposite directions, and meanwhile, the transverse pressing driving piece drives the transverse pressing piece to transversely press the bending part of the prepreg laminating plate.
Further, the cross pressing piece is a cross column, and the surface of the cross column facing the web clamping die assembly is an arc-shaped surface.
Further, the transverse pressing piece is a transverse roller, and the transverse roller is rotationally connected with an output shaft of the transverse pressing driving piece.
The transverse pressing piece is connected with the transverse pressing driving piece, the transverse pressing driving piece is connected with the transverse pressing piece through a pressure sensor, the pressure sensor is electrically connected with the controller, and the controller controls the transverse pressing piece to output constant pressure according to feedback of the pressure sensor.
Further, the first wing plate driving assembly further comprises a first clamping plate arranged opposite to the top die, and a third driving piece driving the first clamping plate to be close to or far away from the top die.
Further, the second wing plate driving assembly further comprises a second clamping plate arranged opposite to the push mold, and a fourth driving piece driving the second clamping plate to move towards or away from the push mold.
Further, when the prepreg is placed, the surface of the first clamping plate facing the top die, the surface of the lower clamping plate facing the upper clamping plate, and the surface of the push die facing the second clamping plate are in the same plane.
Further, when the prepreg is driven to be bent, gaps are reserved between the top die and the first clamping plate and between the pushing die and the second clamping plate, and the gaps are slightly larger than the thickness of the prepreg laminated plate.
The invention has the beneficial effects that: according to the invention, the web plate die clamping component is used for fixing the middle position of the prepreg laminated plate, the first wing plate driving component and the second wing plate driving component are used for driving the two end parts of the prepreg laminated plate synchronously and reversely, so that the extrusion forces applied to the two ends of the prepreg laminated plate in the forming process are the same, and the two ends are simultaneously stressed and formed, and when the two ends of the prepreg laminated plate are bent, the transverse pressing module is arranged, so that the pressure is transversely applied to the wing plates at the two ends of the prepreg laminated plate, the two ends are transversely pushed and extruded while being bent, the forming pressure of the prepreg laminated plate at the bent part is ensured, and compared with the prior art, the forming quality of a straight Z-shaped spacer is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cross-press type straight Z-shaped bulkhead preforming device in the embodiment of the invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the formation of a straight Z-shaped bulkhead according to an embodiment of the invention;
FIG. 4 is a schematic view of a prepreg laminate as placed in an embodiment of the invention;
FIG. 5 is a schematic view of a prepreg laminate as it is heated in an embodiment of the invention;
FIG. 6 is a schematic view of a prepreg laminate as it is being bent according to an embodiment of the invention;
fig. 7 is a schematic structural view of the straight Z bulkhead component of the embodiment of the invention during component removal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The straight Z-former preforming device as shown in fig. 1 to 7 includes: a web clamp die assembly 10, a first wing plate drive assembly 20, and a second wing plate drive assembly 30, wherein:
in this embodiment, when the prepreg laminated sheet is placed horizontally, the central portion thereof is referred to as a web, the portions to be bent at both ends thereof are referred to as wings, and the dotted line portion is an initial form of the prepreg laminated sheet, as shown in fig. 3. The prepreg forming process is a process of clamping the position of the middle web plate and then bending the wing plates at the two ends.
The web clamping module assembly 10 is used for clamping the middle position of a prepreg laminated plate and comprises an upper clamping plate 11, a lower clamping plate 12 and a clamping driving piece 13, wherein the upper clamping plate 11 and the lower clamping plate 12 are arranged oppositely, and the clamping driving piece 13 is connected with the upper clamping plate 11; a clamping drive 13 drives the upper jaw 11 towards or away from the lower jaw 12 to clamp or release the web position of the prepreg layup;
the contact surfaces of the upper clamping plate 11 and the lower clamping plate 12 are horizontal surfaces, and both the two side surfaces of the upper clamping plate 11 and the two side surfaces of the lower clamping plate 12 are perpendicular to the contact surfaces of the upper clamping plate and the lower clamping plate and are used for forming wing plates at two ends of the prepreg laminated plate; in the specific molding, the lower clamping plate 12 and one of the two side edges of the lower clamping plate 12 are formed walls of a straight Z-shaped diaphragm.
The first wing plate driving assembly 20 is arranged on one side surface of the web clamping die assembly 10 and comprises a top die 21 and a first driving piece 22 for driving the top die 21 to move towards a first direction, and the first direction is parallel to the driving direction of the clamping driving piece 13; during the movement, the top die 21 is pressed down, and the prepreg laminated sheet is bent into the gap between the top die 21 and the lower clamp plate 12 due to the gap between the top die and the lower clamp plate.
The second wing plate driving assembly 30 is arranged on the other side surface of the web clamping die assembly 10 and comprises a push die 31 and a second driving piece 32 for driving the push die 31 to move in a direction parallel to the first direction and in a reverse direction; the pushing die 31 is opposite to the moving direction of the top die 21, and pushes the prepreg laminated plate to bend upwards, so that two ends of the linear prepreg laminated plate are bent to form a straight Z shape.
The top die 21 and the push die 31 are both provided with a transverse pressing module 210, the transverse pressing module 210 comprises a transverse pressing driving piece 211 and a transverse pressing piece 212, when the prepreg laminated board is formed, the top die 21 and the push die 31 drive the prepreg to be bent towards opposite directions, and meanwhile, the transverse pressing driving piece 211 drives the transverse pressing piece 212 to transversely press the bending part of the prepreg laminated board. Because top mould 21 and ejector die 31 all move in vertical direction, can't guarantee transversely to the pressure of preimpregnation material laminated sheet, through the setting of horizontal pressure module 210 for when top mould 21 and ejector die 31 move in vertical direction, give the portion of bending pressure of preimpregnation material laminated sheet in the horizontal direction, thereby keep the stress of the middle part of preimpregnation material laminated sheet and the both ends portion of bending always, guarantee that the thickness of final fashioned straight Z spacer is even, product quality is better.
As an embodiment of the present invention, the cross pressing member 212 may be a cross post, and a surface of the cross post facing the web clamping module assembly 10 is configured as an arc surface (not shown in the drawings), that is, the cross pressing driving member 211 drives the cross post to push towards the prepreg bending portion, where the cross section of the cross post may be in various shapes such as square, rectangle, trapezoid, circle, or ellipse, and the arc surface is configured in a direction facing the prepreg laminated board, so that the prepreg laminated board can be more smoothly bent, the resistance is reduced, and the uniformity of the product is improved.
As another embodiment of the present invention, the lateral pressing member 212 may also be a lateral roller, and the lateral roller is rotatably connected to the output shaft of the lateral pressing driving member 211. Through the rotatable connection of horizontal roller and horizontal pressure driving piece 211 for under the drive of horizontal pressure driving piece 211, horizontal roller and prepreg laminate board portion of bending rolling contact, through this kind of setting, can keep the pressure of horizontal roller and prepreg portion of bending on the one hand, can reduce the frictional force that prepreg portion of bending received on the one hand.
In order to ensure the balance of the pressure applied by the transverse pressing driving module when the top die 21 and the push die 31 move, the present embodiment further includes a controller, a pressure sensor is connected between the transverse pressing driving element 211 and the transverse pressing element 212, the pressure sensor is electrically connected to the controller, and the controller controls the transverse pressing element 212 to output a constant pressure according to the feedback of the pressure sensor. In this embodiment, the pressure sensor may be a patch sensor, fixed at a connection position of the lateral pressure driving member 211 and the lateral pressure member 212, and configured to detect the magnitude of the pressure through force transmission. In the embodiment of the invention, the driving part can be a linear driving structure commonly used in the field, such as an air cylinder, a motor screw rod structure or a hydraulic cylinder.
In order to ensure the flatness of the prepreg laminate when the prepreg laminate is placed, in the present embodiment, the first flap driving assembly 20 further includes a first clamping plate 23 disposed opposite the top mold 21, and a third driving member 24 driving the first clamping plate 23 to be close to or away from the top mold 21. Meanwhile, the second wing driving assembly 30 further includes a second clamping plate 33 disposed opposite to the push mold 31, and a fourth driving member 34 driving the second clamping plate 33 to move toward or away from the push mold 31. In the above embodiment, the first clamping plate 23 and the second clamping plate 33 can play a role in supporting, and on the other hand, the top die 21 and the push die 31 have a heating function, so that when heating, heat can be better conducted through clamping of the first clamping plate 23 and the second clamping plate 33, and the heating efficiency is improved; in addition, the third driving part 24 and the fourth driving part 34 are arranged to enable the first clamping plate 23 to move downwards synchronously with the top die 21, and the second clamping plate 33 to push upwards synchronously with the pushing die 31, so that the flatness of the non-bending parts of the wing plates at the two ends is ensured in the bending process.
Specifically, when the prepreg is placed, the surface of the first nip plate 23 facing the top mold 21, the surface of the lower nip plate 12 facing the upper nip plate 11, and the surface of the push mold 31 facing the second nip plate 33 are flush with each other. It is also possible to provide a locating member on the first clamping plate 23 or the push mould 31 to facilitate rapid location of the prepreg layup.
When the prepreg is driven to bend, gaps are left between the top die 21 and the first clamping plate 23 and between the push die 31 and the second clamping plate 33, and the gaps are slightly larger than the thickness of the prepreg laminated plate. The gaps are arranged to provide spaces for sliding of two end parts of the prepreg laminated plate, and the prepreg laminated plate is still limited by friction force when sliding through the gaps, so that wrinkles generated in the sliding process are avoided.
As shown in fig. 4 to 7, the whole process of forming the prepreg laminated board in the embodiment of the present invention is that, first, as shown in fig. 4, the first clamping plate 23, the lower clamping plate 12 and the pushing mold 31 are driven to the same water surface, and the top mold 21, the upper clamping plate 11 and the second clamping plate 33 are opened to place the prepreg laminated board; then, as shown in fig. 5, while the positions of the first nip plate 23, the lower nip plate 12, and the push mold 31 are kept, the top mold 21 and the upper nip plate 11 are pushed down and the second nip plate 33 is pushed down, and then the prepreg laminated sheet is heated by the top mold 21, the upper nip plate 11, the lower nip plate 12, and the push mold 31; after heating to a predetermined temperature, as shown in fig. 6, driving the first clamping plate 23 and the second clamping plate 33 to retreat, so that a certain gap is formed between the top die 21 and the first clamping plate 23 and between the push die 31 and the second clamping plate 33, then synchronously pushing the top die 21 and the first clamping plate 23 and reversely and synchronously pushing the push die 31 and the second clamping plate 33, the wing plates at the two ends of the prepreg are bent, and simultaneously, transversely pressing the driving member 211 to start to apply a transverse force, so that the transverse pressing member 212 and the bent part of the prepreg receive a constant pressure until the top die 21 and the push die 31 move to the limit positions; finally, as shown in fig. 7, the mold is opened and the workpiece is taken out.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A cross-pressing type straight Z-shaped bulkhead preforming device is characterized by comprising:
the web plate clamping die assembly comprises an upper clamping plate, a lower clamping plate and a clamping driving piece, wherein the upper clamping plate and the lower clamping plate are arranged oppositely, and the clamping driving piece is connected with the upper clamping plate; the clamping driving piece drives the upper clamping plate to be close to or far away from the lower clamping plate so as to clamp or release the position of a web plate of the prepreg laminated plate;
the contact surfaces of the upper clamping plate and the lower clamping plate are horizontal surfaces, and the two side surfaces of the upper clamping plate and the two side surfaces of the lower clamping plate are perpendicular to the contact surfaces of the upper clamping plate and the lower clamping plate and are used for molding wing plates at two ends of the prepreg laminated plate;
the first wing plate driving assembly is arranged on one side surface of the web plate clamping die assembly and comprises a top die and a first driving piece for driving the top die to move towards a first direction, and the first direction is parallel to the driving direction of the clamping driving piece;
the second wing plate driving assembly is arranged on the other side face of the web plate clamping die assembly and comprises a push die and a second driving piece which drives the push die to move towards the direction parallel to the first direction and in the opposite direction;
the prepreg stacking device comprises a top die, a push die, a transverse pressing driving piece, a transverse pressing driving piece and a transverse pressing piece, wherein the top die and the push die are both provided with the transverse pressing module, the transverse pressing driving piece and the transverse pressing piece are driven by the top die and the push die to face opposite directions to drive prepreg to be bent when a prepreg stacking plate is formed, and meanwhile, the transverse pressing driving piece drives the transverse pressing piece to transversely press the bending part of the prepreg stacking plate;
the first wing plate driving assembly further comprises a first clamping plate arranged opposite to the top die and a third driving piece driving the first clamping plate to be close to or far away from the top die;
the second wing plate driving assembly further comprises a second clamping plate arranged opposite to the push mold, and a fourth driving piece for driving the second clamping plate to move towards or away from the push mold;
when the prepreg is placed, the surface of the first clamping plate facing the top die, the surface of the lower clamping plate facing the upper clamping plate and the surface of the push die facing the second clamping plate are in the same plane;
when the driving prepreg is bent, gaps are reserved between the top die and the first clamping plate and between the pushing die and the second clamping plate, the gaps are slightly larger than the thickness of the prepreg laminated plate, the prepreg laminated plate is still limited by friction force when sliding through the gaps, and wrinkles generated in the sliding process are avoided.
2. The cross-over type straight Z-bulkhead pre-forming device according to claim 1, wherein the cross-over piece is a cross-post, and the face of the cross-post facing the web clamping die assembly is configured as an arc-shaped face.
3. The cross-pressing type straight Z-shaped bulkhead preforming device according to claim 1, wherein the cross-pressing piece is a cross roller, and the cross roller is rotatably connected to the output shaft of the cross-pressing driving piece.
4. The cross-pressing type straight Z-shaped bulkhead preforming device according to any one of claims 1 to 3, further comprising a controller, wherein a pressure sensor is connected between the cross-pressing driving member and the cross-pressing member, the pressure sensor is electrically connected with the controller, and the controller controls the cross-pressing member to output a constant pressure according to the feedback of the pressure sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011039239.1A CN112248415B (en) | 2020-09-28 | 2020-09-28 | Transverse-pressing type straight Z-shaped partition frame preforming device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011039239.1A CN112248415B (en) | 2020-09-28 | 2020-09-28 | Transverse-pressing type straight Z-shaped partition frame preforming device |
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| CN112248415A CN112248415A (en) | 2021-01-22 |
| CN112248415B true CN112248415B (en) | 2021-11-26 |
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| CN1144497A (en) * | 1995-01-27 | 1997-03-05 | 株式会社金光 | Metal sheet having annular peripheral wall and method of thickening annular peripheral wall |
| CN103338914A (en) * | 2010-12-07 | 2013-10-02 | 吉凯恩航空服务有限公司 | Method of forming a composite structure comprising a flange |
| CN203304342U (en) * | 2013-07-04 | 2013-11-27 | 福建金浦汽车悬架有限公司 | Steel-plate bending mechanism |
| CN203955878U (en) * | 2014-06-05 | 2014-11-26 | 昆山电子羽电业制品有限公司 | A kind of diel for thruster |
| CN107096837A (en) * | 2017-06-27 | 2017-08-29 | 昆山申凌精密金属工业有限公司 | A kind of computer Qian shape bool bending die |
| EP3427920A1 (en) * | 2017-07-13 | 2019-01-16 | ATOP S.p.A. | Apparatus and method for forming pre-shaped insulating sheets |
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2020
- 2020-09-28 CN CN202011039239.1A patent/CN112248415B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1144497A (en) * | 1995-01-27 | 1997-03-05 | 株式会社金光 | Metal sheet having annular peripheral wall and method of thickening annular peripheral wall |
| CN103338914A (en) * | 2010-12-07 | 2013-10-02 | 吉凯恩航空服务有限公司 | Method of forming a composite structure comprising a flange |
| CN203304342U (en) * | 2013-07-04 | 2013-11-27 | 福建金浦汽车悬架有限公司 | Steel-plate bending mechanism |
| CN203955878U (en) * | 2014-06-05 | 2014-11-26 | 昆山电子羽电业制品有限公司 | A kind of diel for thruster |
| CN107096837A (en) * | 2017-06-27 | 2017-08-29 | 昆山申凌精密金属工业有限公司 | A kind of computer Qian shape bool bending die |
| EP3427920A1 (en) * | 2017-07-13 | 2019-01-16 | ATOP S.p.A. | Apparatus and method for forming pre-shaped insulating sheets |
| CN111093947A (en) * | 2017-07-13 | 2020-05-01 | Atop有限公司 | Apparatus and method for forming preformed insulating sheets |
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